1 Version 1.66.0 (2022-12-15)
2 ==========================
6 - [Permit specifying explicit discriminants on all `repr(Int)` enums](https://github.com/rust-lang/rust/pull/95710/)
15 - [Allow transmutes between the same type differing only in lifetimes](https://github.com/rust-lang/rust/pull/101520/)
16 - [Change constant evaluation errors from a deny-by-default lint to a hard error](https://github.com/rust-lang/rust/pull/102091/)
17 - [Trigger `must_use` on `impl Trait` for supertraits](https://github.com/rust-lang/rust/pull/102287/)
18 This makes `impl ExactSizeIterator` respect the existing `#[must_use]` annotation on `Iterator`.
19 - [Allow `..=X` in patterns](https://github.com/rust-lang/rust/pull/102275/)
20 - [Uplift `clippy::for_loops_over_fallibles` lint into rustc](https://github.com/rust-lang/rust/pull/99696/)
21 - [Stabilize `sym` operands in inline assembly](https://github.com/rust-lang/rust/pull/103168/)
22 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101912/)
23 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
24 This is a soundness fix which may break code that was erroneously relying on this behavior.
28 - [Add armv5te-none-eabi and thumbv5te-none-eabi tier 3 targets](https://github.com/rust-lang/rust/pull/101329/)
29 - Refer to Rust's [platform support page][platform-support-doc] for more
30 information on Rust's tiered platform support.
31 - [Add support for linking against macOS universal libraries](https://github.com/rust-lang/rust/pull/98736)
35 - [Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds](https://github.com/rust-lang/rust/pull/101040/)
36 - [Update to Unicode 15](https://github.com/rust-lang/rust/pull/101821/)
41 - [`proc_macro::Span::source_text`](https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.source_text)
42 - [`uX::{checked_add_signed, overflowing_add_signed, saturating_add_signed, wrapping_add_signed}`](https://doc.rust-lang.org/stable/std/primitive.u8.html#method.checked_add_signed)
43 - [`iX::{checked_add_unsigned, overflowing_add_unsigned, saturating_add_unsigned, wrapping_add_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_add_unsigned)
44 - [`iX::{checked_sub_unsigned, overflowing_sub_unsigned, saturating_sub_unsigned, wrapping_sub_unsigned}`](https://doc.rust-lang.org/stable/std/primitive.i8.html#method.checked_sub_unsigned)
45 - [`BTreeSet::{first, last, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.first)
46 - [`BTreeMap::{first_key_value, last_key_value, first_entry, last_entry, pop_first, pop_last}`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.first_key_value)
47 - [Add `AsFd` implementations for stdio lock types on WASI.](https://github.com/rust-lang/rust/pull/101768/)
48 - [`impl TryFrom<Vec<T>> for Box<[T; N]>`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#impl-TryFrom%3CVec%3CT%2C%20Global%3E%3E-for-Box%3C%5BT%3B%20N%5D%2C%20Global%3E)
49 - [`core::hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
50 - [`Duration::try_from_secs_{f32,f64}`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.try_from_secs_f32)
51 - [`Option::unzip`](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unzip)
52 - [`std::os::fd`](https://doc.rust-lang.org/stable/std/os/fd/index.html)
58 - [Add Rustdoc warning for invalid HTML tags in the documentation](https://github.com/rust-lang/rust/pull/101720/)
63 - [Added `cargo remove` to remove dependencies from Cargo.toml](https://doc.rust-lang.org/nightly/cargo/commands/cargo-remove.html)
64 - [`cargo publish` now waits for the new version to be downloadable before exiting](https://github.com/rust-lang/cargo/pull/11062)
66 See [detailed release notes](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-166-2022-12-15) for more.
71 - [Only apply `ProceduralMasquerade` hack to older versions of `rental`](https://github.com/rust-lang/rust/pull/94063/)
72 - [Don't export `__heap_base` and `__data_end` on wasm32-wasi.](https://github.com/rust-lang/rust/pull/102385/)
73 - [Don't export `__wasm_init_memory` on WebAssembly.](https://github.com/rust-lang/rust/pull/102426/)
74 - [Only export `__tls_*` on wasm32-unknown-unknown.](https://github.com/rust-lang/rust/pull/102440/)
75 - [Don't link to `libresolv` in libstd on Darwin](https://github.com/rust-lang/rust/pull/102766/)
76 - [Update libstd's libc to 0.2.135 (to make `libstd` no longer pull in `libiconv.dylib` on Darwin)](https://github.com/rust-lang/rust/pull/103277/)
77 - [Opaque types no longer imply lifetime bounds](https://github.com/rust-lang/rust/pull/95474/)
78 This is a soundness fix which may break code that was erroneously relying on this behavior.
79 - [Make `order_dependent_trait_objects` show up in future-breakage reports](https://github.com/rust-lang/rust/pull/102635/)
80 - [Change std::process::Command spawning to default to inheriting the parent's signal mask](https://github.com/rust-lang/rust/pull/101077/)
85 These changes do not affect any public interfaces of Rust, but they represent
86 significant improvements to the performance or internals of rustc and related
89 - [Enable BOLT for LLVM compilation](https://github.com/rust-lang/rust/pull/94381/)
90 - [Enable LTO for rustc_driver.so](https://github.com/rust-lang/rust/pull/101403/)
92 Version 1.65.0 (2022-11-03)
93 ==========================
97 - [Error on `as` casts of enums with `#[non_exhaustive]` variants](https://github.com/rust-lang/rust/pull/92744/)
98 - [Stabilize `let else`](https://github.com/rust-lang/rust/pull/93628/)
99 - [Stabilize generic associated types (GATs)](https://github.com/rust-lang/rust/pull/96709/)
100 - [Add lints `let_underscore_drop` and `let_underscore_lock` from Clippy](https://github.com/rust-lang/rust/pull/97739/)
101 - [Stabilize `break`ing from arbitrary labeled blocks ("label-break-value")](https://github.com/rust-lang/rust/pull/99332/)
102 - [Uninitialized integers, floats, and raw pointers are now considered immediate UB](https://github.com/rust-lang/rust/pull/98919/).
103 Usage of `MaybeUninit` is the correct way to work with uninitialized memory.
104 - [Stabilize raw-dylib for Windows x86_64, aarch64, and thumbv7a](https://github.com/rust-lang/rust/pull/99916/)
105 - [Do not allow `Drop` impl on foreign ADTs](https://github.com/rust-lang/rust/pull/99576/)
109 - [Stabilize -Csplit-debuginfo on Linux](https://github.com/rust-lang/rust/pull/98051/)
110 - [Use niche-filling optimization even when multiple variants have data](https://github.com/rust-lang/rust/pull/94075/)
111 - [Associated type projections are now verified to be well-formed prior to resolving the underlying type](https://github.com/rust-lang/rust/pull/99217/#issuecomment-1209365630)
112 - [Stringify non-shorthand visibility correctly](https://github.com/rust-lang/rust/pull/100350/)
113 - [Normalize struct field types when unsizing](https://github.com/rust-lang/rust/pull/101831/)
114 - [Update to LLVM 15](https://github.com/rust-lang/rust/pull/99464/)
115 - [Fix aarch64 call abi to correctly zeroext when needed](https://github.com/rust-lang/rust/pull/97800/)
116 - [debuginfo: Generalize C++-like encoding for enums](https://github.com/rust-lang/rust/pull/98393/)
117 - [Add `special_module_name` lint](https://github.com/rust-lang/rust/pull/94467/)
118 - [Add support for generating unique profraw files by default when using `-C instrument-coverage`](https://github.com/rust-lang/rust/pull/100384/)
119 - [Allow dynamic linking for iOS/tvOS targets](https://github.com/rust-lang/rust/pull/100636/)
123 - [Add armv4t-none-eabi as a tier 3 target](https://github.com/rust-lang/rust/pull/100244/)
124 - [Add powerpc64-unknown-openbsd and riscv64-unknown-openbsd as tier 3 targets](https://github.com/rust-lang/rust/pull/101025/)
125 - Refer to Rust's [platform support page][platform-support-doc] for more
126 information on Rust's tiered platform support.
131 - [Don't generate `PartialEq::ne` in derive(PartialEq)](https://github.com/rust-lang/rust/pull/98655/)
132 - [Windows RNG: Use `BCRYPT_RNG_ALG_HANDLE` by default](https://github.com/rust-lang/rust/pull/101325/)
133 - [Forbid mixing `System` with direct system allocator calls](https://github.com/rust-lang/rust/pull/101394/)
134 - [Document no support for writing to non-blocking stdio/stderr](https://github.com/rust-lang/rust/pull/101416/)
135 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295)
136 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
141 - [`std::backtrace::Backtrace`](https://doc.rust-lang.org/stable/std/backtrace/struct.Backtrace.html)
142 - [`Bound::as_ref`](https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.as_ref)
143 - [`std::io::read_to_string`](https://doc.rust-lang.org/stable/std/io/fn.read_to_string.html)
144 - [`<*const T>::cast_mut`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_mut)
145 - [`<*mut T>::cast_const`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.cast_const)
147 These APIs are now stable in const contexts:
149 - [`<*const T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
150 - [`<*mut T>::offset_from`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from)
155 - [Apply GitHub fast path even for partial hashes](https://github.com/rust-lang/cargo/pull/10807/)
156 - [Do not add home bin path to PATH if it's already there](https://github.com/rust-lang/cargo/pull/11023/)
157 - [Take priority into account within the pending queue](https://github.com/rust-lang/cargo/pull/11032/).
158 This slightly optimizes job scheduling by Cargo, with typically small improvements on larger crate graph builds.
163 - [`std::layout::Layout` size must not overflow `isize::MAX` when rounded up to `align`](https://github.com/rust-lang/rust/pull/95295).
164 This also changes the safety conditions on `Layout::from_size_align_unchecked`.
165 - [`PollFn` now only implements `Unpin` if the closure is `Unpin`](https://github.com/rust-lang/rust/pull/102737).
166 This is a possible breaking change if users were relying on the blanket unpin implementation.
167 See discussion on the PR for details of why this change was made.
168 - [Drop ExactSizeIterator impl from std::char::EscapeAscii](https://github.com/rust-lang/rust/pull/99880)
169 This is a backwards-incompatible change to the standard library's surface
170 area, but is unlikely to affect real world usage.
171 - [Do not consider a single repeated lifetime eligible for elision in the return type](https://github.com/rust-lang/rust/pull/103450)
172 This behavior was unintentionally changed in 1.64.0, and this release reverts that change by making this an error again.
173 - [Reenable disabled early syntax gates as future-incompatibility lints](https://github.com/rust-lang/rust/pull/99935/)
174 - [Update the minimum external LLVM to 13](https://github.com/rust-lang/rust/pull/100460/)
175 - [Don't duplicate file descriptors into stdio fds](https://github.com/rust-lang/rust/pull/101426/)
176 - [Sunset RLS](https://github.com/rust-lang/rust/pull/100863/)
177 - [Deny usage of `#![cfg_attr(..., crate_type = ...)]` to set the crate type](https://github.com/rust-lang/rust/pull/99784/)
178 This strengthens the forward compatibility lint deprecated_cfg_attr_crate_type_name to deny.
179 - [`llvm-has-rust-patches` allows setting the build system to treat the LLVM as having Rust-specific patches](https://github.com/rust-lang/rust/pull/101072)
180 This option may need to be set for distributions that are building Rust with a patched LLVM via `llvm-config`, not the built-in LLVM.
181 - Combining three or more languages (e.g. Objective C, C++ and Rust) into one binary may hit linker limitations when using `lld`. For more information, see [issue 102754][102754].
183 [102754]: https://github.com/rust-lang/rust/issues/102754
188 These changes do not affect any public interfaces of Rust, but they represent
189 significant improvements to the performance or internals of rustc and related
192 - [Add `x.sh` and `x.ps1` shell scripts](https://github.com/rust-lang/rust/pull/99992/)
193 - [compiletest: use target cfg instead of hard-coded tables](https://github.com/rust-lang/rust/pull/100260/)
194 - [Use object instead of LLVM for reading bitcode from rlibs](https://github.com/rust-lang/rust/pull/98100/)
195 - [Enable MIR inlining for optimized compilations](https://github.com/rust-lang/rust/pull/91743)
196 This provides a 3-10% improvement in compiletimes for real world crates. See [perf results](https://perf.rust-lang.org/compare.html?start=aedf78e56b2279cc869962feac5153b6ba7001ed&end=0075bb4fad68e64b6d1be06bf2db366c30bc75e1&stat=instructions:u).
198 Version 1.64.0 (2022-09-22)
199 ===========================
203 - [Unions with mutable references or tuples of allowed types are now allowed](https://github.com/rust-lang/rust/pull/97995/)
204 - 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/)
205 - 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.
209 - [Add Nintendo Switch as tier 3 target](https://github.com/rust-lang/rust/pull/88991/)
210 - Refer to Rust's [platform support page][platform-support-doc] for more
211 information on Rust's tiered platform support.
212 - [Only compile `#[used]` as llvm.compiler.used for ELF targets](https://github.com/rust-lang/rust/pull/93718/)
213 - [Add the `--diagnostic-width` compiler flag to define the terminal width.](https://github.com/rust-lang/rust/pull/95635/)
214 - [Add support for link-flavor `rust-lld` for iOS, tvOS and watchOS](https://github.com/rust-lang/rust/pull/98771/)
218 - [Remove restrictions on compare-exchange memory ordering.](https://github.com/rust-lang/rust/pull/98383/)
219 - You can now `write!` or `writeln!` into an `OsString`: [Implement `fmt::Write` for `OsString`](https://github.com/rust-lang/rust/pull/97915/)
220 - [Make RwLockReadGuard covariant](https://github.com/rust-lang/rust/pull/96820/)
221 - [Implement `FusedIterator` for `std::net::[Into]Incoming`](https://github.com/rust-lang/rust/pull/97300/)
222 - [`impl<T: AsRawFd> AsRawFd for {Arc,Box}<T>`](https://github.com/rust-lang/rust/pull/97437/)
223 - [`ptr::copy` and `ptr::swap` are doing untyped copies](https://github.com/rust-lang/rust/pull/97712/)
224 - [Add cgroupv1 support to `available_parallelism`](https://github.com/rust-lang/rust/pull/97925/)
225 - [Mitigate many incorrect uses of `mem::uninitialized`](https://github.com/rust-lang/rust/pull/99182/)
230 - [`future::IntoFuture`](https://doc.rust-lang.org/stable/std/future/trait.IntoFuture.html)
231 - [`future::poll_fn`](https://doc.rust-lang.org/stable/std/future/fn.poll_fn.html)
232 - [`task::ready!`](https://doc.rust-lang.org/stable/std/task/macro.ready.html)
233 - [`num::NonZero*::checked_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_mul)
234 - [`num::NonZero*::checked_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_pow)
235 - [`num::NonZero*::saturating_mul`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_mul)
236 - [`num::NonZero*::saturating_pow`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_pow)
237 - [`num::NonZeroI*::abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.abs)
238 - [`num::NonZeroI*::checked_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.checked_abs)
239 - [`num::NonZeroI*::overflowing_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.overflowing_abs)
240 - [`num::NonZeroI*::saturating_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.saturating_abs)
241 - [`num::NonZeroI*::unsigned_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.unsigned_abs)
242 - [`num::NonZeroI*::wrapping_abs`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroIsize.html#method.wrapping_abs)
243 - [`num::NonZeroU*::checked_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_add)
244 - [`num::NonZeroU*::checked_next_power_of_two`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.checked_next_power_of_two)
245 - [`num::NonZeroU*::saturating_add`](https://doc.rust-lang.org/stable/std/num/struct.NonZeroUsize.html#method.saturating_add)
246 - [`os::unix::process::CommandExt::process_group`](https://doc.rust-lang.org/stable/std/os/unix/process/trait.CommandExt.html#tymethod.process_group)
247 - [`os::windows::fs::FileTypeExt::is_symlink_dir`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_dir)
248 - [`os::windows::fs::FileTypeExt::is_symlink_file`](https://doc.rust-lang.org/stable/std/os/windows/fs/trait.FileTypeExt.html#tymethod.is_symlink_file)
250 These types were previously stable in `std::ffi`, but are now also available in `core` and `alloc`:
252 - [`core::ffi::CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html)
253 - [`core::ffi::FromBytesWithNulError`](https://doc.rust-lang.org/stable/core/ffi/struct.FromBytesWithNulError.html)
254 - [`alloc::ffi::CString`](https://doc.rust-lang.org/stable/alloc/ffi/struct.CString.html)
255 - [`alloc::ffi::FromVecWithNulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.FromVecWithNulError.html)
256 - [`alloc::ffi::IntoStringError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.IntoStringError.html)
257 - [`alloc::ffi::NulError`](https://doc.rust-lang.org/stable/alloc/ffi/struct.NulError.html)
259 These types were previously stable in `std::os::raw`, but are now also available in `core::ffi` and `std::ffi`:
261 - [`ffi::c_char`](https://doc.rust-lang.org/stable/std/ffi/type.c_char.html)
262 - [`ffi::c_double`](https://doc.rust-lang.org/stable/std/ffi/type.c_double.html)
263 - [`ffi::c_float`](https://doc.rust-lang.org/stable/std/ffi/type.c_float.html)
264 - [`ffi::c_int`](https://doc.rust-lang.org/stable/std/ffi/type.c_int.html)
265 - [`ffi::c_long`](https://doc.rust-lang.org/stable/std/ffi/type.c_long.html)
266 - [`ffi::c_longlong`](https://doc.rust-lang.org/stable/std/ffi/type.c_longlong.html)
267 - [`ffi::c_schar`](https://doc.rust-lang.org/stable/std/ffi/type.c_schar.html)
268 - [`ffi::c_short`](https://doc.rust-lang.org/stable/std/ffi/type.c_short.html)
269 - [`ffi::c_uchar`](https://doc.rust-lang.org/stable/std/ffi/type.c_uchar.html)
270 - [`ffi::c_uint`](https://doc.rust-lang.org/stable/std/ffi/type.c_uint.html)
271 - [`ffi::c_ulong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulong.html)
272 - [`ffi::c_ulonglong`](https://doc.rust-lang.org/stable/std/ffi/type.c_ulonglong.html)
273 - [`ffi::c_ushort`](https://doc.rust-lang.org/stable/std/ffi/type.c_ushort.html)
275 These APIs are now usable in const contexts:
277 - [`slice::from_raw_parts`](https://doc.rust-lang.org/stable/core/slice/fn.from_raw_parts.html)
281 - [Packages can now inherit settings from the workspace so that the settings
282 can be centralized in one place.](https://github.com/rust-lang/cargo/pull/10859) See
283 [`workspace.package`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacepackage-table)
285 [`workspace.dependencies`](https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-workspacedependencies-table)
286 for more details on how to define these common settings.
287 - [Cargo commands can now accept multiple `--target` flags to build for
288 multiple targets at once](https://github.com/rust-lang/cargo/pull/10766), and the
289 [`build.target`](https://doc.rust-lang.org/nightly/cargo/reference/config.html#buildtarget)
290 config option may now take an array of multiple targets.
291 - [The `--jobs` argument can now take a negative number to count backwards from
292 the max CPUs.](https://github.com/rust-lang/cargo/pull/10844)
293 - [`cargo add` will now update `Cargo.lock`.](https://github.com/rust-lang/cargo/pull/10902)
294 - [Added](https://github.com/rust-lang/cargo/pull/10838) the
295 [`--crate-type`](https://doc.rust-lang.org/nightly/cargo/commands/cargo-rustc.html#option-cargo-rustc---crate-type)
296 flag to `cargo rustc` to override the crate type.
297 - [Significantly improved the performance fetching git dependencies from GitHub
298 when using a hash in the `rev` field.](https://github.com/rust-lang/cargo/pull/10079)
302 - [The `rust-analyzer` rustup component is now available on the stable channel.](https://github.com/rust-lang/rust/pull/98640/)
306 - 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/)
307 - [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.
308 - [Add assertion that `transmute_copy`'s `U` is not larger than `T`](https://github.com/rust-lang/rust/pull/98839/)
309 - [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.
310 - [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.
311 - [Relate late-bound closure lifetimes to parent fn in NLL](https://github.com/rust-lang/rust/pull/98835/)
312 - [Errors at const-eval time are now in future incompatibility reports](https://github.com/rust-lang/rust/pull/97743/)
313 - 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/).
314 - [`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.
319 These changes do not affect any public interfaces of Rust, but they represent
320 significant improvements to the performance or internals of rustc and related
323 - 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/)
324 - [Stop keeping metadata in memory before writing it to disk](https://github.com/rust-lang/rust/pull/96544/)
325 - [compiletest: strip debuginfo by default for mode=ui](https://github.com/rust-lang/rust/pull/98140/)
326 - Many improvements to generated code for derives, including performance improvements:
327 - [Don't use match-destructuring for derived ops on structs.](https://github.com/rust-lang/rust/pull/98446/)
328 - [Many small deriving cleanups](https://github.com/rust-lang/rust/pull/98741/)
329 - [More derive output improvements](https://github.com/rust-lang/rust/pull/98758/)
330 - [Clarify deriving code](https://github.com/rust-lang/rust/pull/98915/)
331 - [Final derive output improvements](https://github.com/rust-lang/rust/pull/99046/)
332 - [Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations](https://github.com/rust-lang/rust/pull/99485/)
333 - [Improve `derive(Debug)`](https://github.com/rust-lang/rust/pull/98190/)
334 - [Bump to clap 3](https://github.com/rust-lang/rust/pull/98213/)
335 - [fully move dropck to mir](https://github.com/rust-lang/rust/pull/98641/)
336 - [Optimize `Vec::insert` for the case where `index == len`.](https://github.com/rust-lang/rust/pull/98755/)
337 - [Convert rust-analyzer to an in-tree tool](https://github.com/rust-lang/rust/pull/99603/)
339 Version 1.63.0 (2022-08-11)
340 ==========================
344 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
345 - [Modify MIR building to drop repeat expressions with length zero.][95953]
346 - [Remove label/lifetime shadowing warnings.][96296]
347 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
348 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
349 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
350 - [lub: don't bail out due to empty binders.][97867]
354 - [Stabilize the `bundle` native library modifier,][95818] also removing the
355 deprecated `static-nobundle` linking kind.
356 - [Add Apple WatchOS compile targets\*.][95243]
357 - [Add a Windows application manifest to rustc-main.][96737]
359 \* Refer to Rust's [platform support page][platform-support-doc] for more
360 information on Rust's tiered platform support.
364 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
365 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
366 - [`impl Read and Write for VecDeque<u8>`.][95632]
367 - [STD support for the Nintendo 3DS.][95897]
368 - [Use rounding in float to Duration conversion methods.][96051]
369 - [Make write/print macros eagerly drop temporaries.][96455]
370 - [Implement internal traits that enable `[OsStr]::join`.][96881]
371 - [Implement `Hash` for `core::alloc::Layout`.][97034]
372 - [Add capacity documentation for `OsString`.][97202]
373 - [Put a bound on collection misbehavior.][97316]
374 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
375 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
376 - [Document Rust's stance on `/proc/self/mem`.][97837]
383 - [`BinaryHeap::try_reserve`]
384 - [`BinaryHeap::try_reserve_exact`]
385 - [`OsString::try_reserve`]
386 - [`OsString::try_reserve_exact`]
387 - [`PathBuf::try_reserve`]
388 - [`PathBuf::try_reserve_exact`]
389 - [`Path::try_exists`]
390 - [`Ref::filter_map`]
391 - [`RefMut::filter_map`]
392 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
393 - [`ToOwned::clone_into`]
394 - [`Ipv6Addr::to_ipv4_mapped`]
396 - [`unix::io::BorrowedFd<'fd>`]
397 - [`unix::io::OwnedFd`]
398 - [`windows::io::AsHandle`]
399 - [`windows::io::BorrowedHandle<'handle>`]
400 - [`windows::io::OwnedHandle`]
401 - [`windows::io::HandleOrInvalid`]
402 - [`windows::io::HandleOrNull`]
403 - [`windows::io::InvalidHandleError`]
404 - [`windows::io::NullHandleError`]
405 - [`windows::io::AsSocket`]
406 - [`windows::io::BorrowedSocket<'handle>`]
407 - [`windows::io::OwnedSocket`]
410 - [`thread::ScopedJoinHandle`]
412 These APIs are now usable in const contexts:
414 - [`array::from_ref`]
415 - [`slice::from_ref`]
416 - [`intrinsics::copy`]
417 - [`intrinsics::copy_nonoverlapping`]
418 - [`<*const T>::copy_to`]
419 - [`<*const T>::copy_to_nonoverlapping`]
420 - [`<*mut T>::copy_to`]
421 - [`<*mut T>::copy_to_nonoverlapping`]
422 - [`<*mut T>::copy_from`]
423 - [`<*mut T>::copy_from_nonoverlapping`]
425 - [`Utf8Error::error_len`]
426 - [`Utf8Error::valid_up_to`]
433 - [Stabilize the `--config path` command-line argument.][cargo/10755]
434 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
439 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
440 errors for invalid attribute arguments that were previously ignored.
441 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
442 duration can differ slightly from what it was.
447 These changes provide no direct user facing benefits, but represent significant
448 improvements to the internals and overall performance of rustc
451 - [Prepare Rust for LLVM opaque pointers.][94214]
453 [94214]: https://github.com/rust-lang/rust/pull/94214/
454 [94530]: https://github.com/rust-lang/rust/pull/94530/
455 [94954]: https://github.com/rust-lang/rust/pull/94954/
456 [95243]: https://github.com/rust-lang/rust/pull/95243/
457 [95565]: https://github.com/rust-lang/rust/pull/95565/
458 [95632]: https://github.com/rust-lang/rust/pull/95632/
459 [95818]: https://github.com/rust-lang/rust/pull/95818/
460 [95897]: https://github.com/rust-lang/rust/pull/95897/
461 [95953]: https://github.com/rust-lang/rust/pull/95953/
462 [96051]: https://github.com/rust-lang/rust/pull/96051/
463 [96296]: https://github.com/rust-lang/rust/pull/96296/
464 [96455]: https://github.com/rust-lang/rust/pull/96455/
465 [96737]: https://github.com/rust-lang/rust/pull/96737/
466 [96868]: https://github.com/rust-lang/rust/pull/96868/
467 [96881]: https://github.com/rust-lang/rust/pull/96881/
468 [96885]: https://github.com/rust-lang/rust/pull/96885/
469 [96959]: https://github.com/rust-lang/rust/pull/96959/
470 [97034]: https://github.com/rust-lang/rust/pull/97034/
471 [97202]: https://github.com/rust-lang/rust/pull/97202/
472 [97316]: https://github.com/rust-lang/rust/pull/97316/
473 [97652]: https://github.com/rust-lang/rust/pull/97652/
474 [97675]: https://github.com/rust-lang/rust/pull/97675/
475 [97803]: https://github.com/rust-lang/rust/pull/97803/
476 [97837]: https://github.com/rust-lang/rust/pull/97837/
477 [97867]: https://github.com/rust-lang/rust/pull/97867/
478 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
479 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
481 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
482 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
483 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
484 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
485 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
486 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
487 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
488 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
489 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
490 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
491 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
492 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
493 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
494 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
495 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
496 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
497 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
498 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
499 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
500 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
501 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
502 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
503 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
504 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
505 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
506 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
507 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
508 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
509 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
510 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
512 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
513 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
514 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
515 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
516 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
517 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
518 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
519 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
520 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
521 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
522 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
523 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
524 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
525 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
526 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
527 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
529 Version 1.62.1 (2022-07-19)
530 ==========================
532 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
533 library, and also mitigates a CPU vulnerability on Intel SGX.
535 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
536 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
537 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
538 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
539 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
541 [98608]: https://github.com/rust-lang/rust/issues/98608
542 [98890]: https://github.com/rust-lang/rust/issues/98890
543 [98950]: https://github.com/rust-lang/rust/pull/98950
544 [98126]: https://github.com/rust-lang/rust/pull/98126
545 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
547 Version 1.62.0 (2022-06-30)
548 ==========================
553 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
554 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
555 - [Fix constants not getting dropped if part of a diverging expression][94775]
556 - [Support unit struct/enum variant in destructuring assignment][95380]
557 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
558 - [`const` functions may now specify `extern "C"` or `extern "Rust"`][95346]
563 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
564 - [Make `unaligned_references` lint deny-by-default][95372]
565 This lint is also a future compatibility lint, and is expected to eventually
567 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
568 - [Reject `#[thread_local]` attribute on non-static items][95006]
569 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
570 - [Implement a lint to warn about unused macro rules][96150]
571 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
573 \* Refer to Rust's [platform support page][platform-support-doc] for more
574 information on Rust's tiered platform support.
579 - [Windows: Use a pipe relay for chaining pipes][95841]
580 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
581 - [Replace RwLock by a futex based one on Linux][95801]
582 - [std: directly use pthread in UNIX parker implementation][96393]
587 - [`bool::then_some`]
591 - [`windows::CommandExt::raw_arg`]
592 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
593 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
594 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
595 - [`FusedIterator for EncodeWide`]
596 - [RDM intrinsics on aarch64][stdarch/1285]
601 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
606 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
608 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
609 - Package ID specs now support `name@version` syntax in addition to the
610 previous `name:version` to align with the behavior in `cargo add` and other
611 tools. `cargo install` and `cargo yank` also now support this syntax so the
612 version does not need to passed as a separate flag.
613 - The `git` and `registry` directories in Cargo's home directory (usually
614 `~/.cargo`) are now marked as cache directories so that they are not
615 included in backups or content indexing (on Windows).
616 - Added automatic `@` argfile support, which will use "response files" if the
617 command-line to `rustc` exceeds the operating system's limit.
622 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
623 the same as the host target.
624 [#10594](https://github.com/rust-lang/cargo/pull/10594)
625 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
626 - [rustdoc: Remove .woff font files][96279]
627 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
628 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
629 complete synchronously][95469].
634 - [Unify ReentrantMutex implementations across all platforms][96042]
636 These changes provide no direct user facing benefits, but represent significant
637 improvements to the internals and overall performance of rustc
640 [93313]: https://github.com/rust-lang/rust/pull/93313/
641 [93969]: https://github.com/rust-lang/rust/pull/93969/
642 [94206]: https://github.com/rust-lang/rust/pull/94206/
643 [94457]: https://github.com/rust-lang/rust/pull/94457/
644 [94775]: https://github.com/rust-lang/rust/pull/94775/
645 [94872]: https://github.com/rust-lang/rust/pull/94872/
646 [95006]: https://github.com/rust-lang/rust/pull/95006/
647 [95035]: https://github.com/rust-lang/rust/pull/95035/
648 [95346]: https://github.com/rust-lang/rust/pull/95346/
649 [95372]: https://github.com/rust-lang/rust/pull/95372/
650 [95380]: https://github.com/rust-lang/rust/pull/95380/
651 [95431]: https://github.com/rust-lang/rust/pull/95431/
652 [95469]: https://github.com/rust-lang/rust/pull/95469/
653 [95705]: https://github.com/rust-lang/rust/pull/95705/
654 [95801]: https://github.com/rust-lang/rust/pull/95801/
655 [95819]: https://github.com/rust-lang/rust/pull/95819/
656 [95841]: https://github.com/rust-lang/rust/pull/95841/
657 [96042]: https://github.com/rust-lang/rust/pull/96042/
658 [96150]: https://github.com/rust-lang/rust/pull/96150/
659 [96268]: https://github.com/rust-lang/rust/pull/96268/
660 [96279]: https://github.com/rust-lang/rust/pull/96279/
661 [96393]: https://github.com/rust-lang/rust/pull/96393/
662 [96436]: https://github.com/rust-lang/rust/pull/96436/
663 [96557]: https://github.com/rust-lang/rust/pull/96557/
664 [96630]: https://github.com/rust-lang/rust/pull/96630/
666 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
667 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
668 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
669 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
670 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
671 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
672 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
673 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
674 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
675 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
677 Version 1.61.0 (2022-05-19)
678 ==========================
683 - [`const fn` signatures can now include generic trait bounds][93827]
684 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
685 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
686 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
691 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
692 - [The `char` type is now described as UTF-32 in debuginfo][89887]
693 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
694 - X86 [`#[target_feature = "adx"]` is now stable][93745]
699 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
700 - [`#[ignore = "…"]` messages are printed when running tests][92714]
701 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
702 - [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.
703 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
704 - [`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.
709 - [`Pin::static_mut`]
710 - [`Pin::static_ref`]
711 - [`Vec::retain_mut`]
712 - [`VecDeque::retain_mut`]
713 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
714 - [`std::os::unix::net::SocketAddr::from_pathname`]
715 - [`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.
716 - [`std::thread::JoinHandle::is_finished`]
718 These APIs are now usable in const contexts:
720 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
721 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
722 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
723 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
724 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
725 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
726 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
727 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
728 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
733 No feature changes, but see compatibility notes.
738 - 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
739 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
740 - (less common) or be updated to use the [`+whole-archive`] modifier.
741 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
742 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
743 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
744 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
745 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
746 - [`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`.
747 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
752 These changes provide no direct user facing benefits, but represent significant
753 improvements to the internals and overall performance of rustc
756 - [debuginfo: Refactor debuginfo generation for types][94261]
757 - [Remove the everybody loops pass][93913]
759 [88375]: https://github.com/rust-lang/rust/pull/88375/
760 [89887]: https://github.com/rust-lang/rust/pull/89887/
761 [90621]: https://github.com/rust-lang/rust/pull/90621/
762 [92285]: https://github.com/rust-lang/rust/pull/92285/
763 [92472]: https://github.com/rust-lang/rust/pull/92472/
764 [92697]: https://github.com/rust-lang/rust/pull/92697/
765 [92714]: https://github.com/rust-lang/rust/pull/92714/
766 [92911]: https://github.com/rust-lang/rust/pull/92911/
767 [93263]: https://github.com/rust-lang/rust/pull/93263/
768 [93745]: https://github.com/rust-lang/rust/pull/93745/
769 [93827]: https://github.com/rust-lang/rust/pull/93827/
770 [93901]: https://github.com/rust-lang/rust/pull/93901/
771 [93913]: https://github.com/rust-lang/rust/pull/93913/
772 [93965]: https://github.com/rust-lang/rust/pull/93965/
773 [94081]: https://github.com/rust-lang/rust/pull/94081/
774 [94261]: https://github.com/rust-lang/rust/pull/94261/
775 [94295]: https://github.com/rust-lang/rust/pull/94295/
776 [94832]: https://github.com/rust-lang/rust/pull/94832/
777 [95016]: https://github.com/rust-lang/rust/pull/95016/
778 [95251]: https://github.com/rust-lang/rust/pull/95251/
779 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
780 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
781 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
782 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
783 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
784 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
785 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
786 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
787 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
788 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
789 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
790 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
791 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
792 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
793 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
794 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
795 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
796 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
797 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
798 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
799 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
800 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
803 Version 1.60.0 (2022-04-07)
804 ==========================
808 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
809 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
813 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
814 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
815 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
816 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
817 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
818 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
819 - [Fix invalid removal of newlines from doc comments][92357]
820 - [Add kernel target for RustyHermit][92670]
821 - [Deny mixing bin crate type with lib crate types][92933]
822 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
823 - [Upgrade to LLVM 14][93577]
825 \* Refer to Rust's [platform support page][platform-support-doc] for more
826 information on Rust's tiered platform support.
830 - [Guarantee call order for `sort_by_cached_key`][89621]
831 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
832 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
833 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
834 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
838 - [`Arc::new_cyclic`][arc_new_cyclic]
839 - [`Rc::new_cyclic`][rc_new_cyclic]
840 - [`slice::EscapeAscii`][slice_escape_ascii]
841 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
842 - [`u8::escape_ascii`][u8_escape_ascii]
843 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
844 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
845 - [`MaybeUninit::assume_init_read`][assume_init_read]
846 - [`i8::abs_diff`][i8_abs_diff]
847 - [`i16::abs_diff`][i16_abs_diff]
848 - [`i32::abs_diff`][i32_abs_diff]
849 - [`i64::abs_diff`][i64_abs_diff]
850 - [`i128::abs_diff`][i128_abs_diff]
851 - [`isize::abs_diff`][isize_abs_diff]
852 - [`u8::abs_diff`][u8_abs_diff]
853 - [`u16::abs_diff`][u16_abs_diff]
854 - [`u32::abs_diff`][u32_abs_diff]
855 - [`u64::abs_diff`][u64_abs_diff]
856 - [`u128::abs_diff`][u128_abs_diff]
857 - [`usize::abs_diff`][usize_abs_diff]
858 - [`Display for io::ErrorKind`][display_error_kind]
859 - [`From<u8> for ExitCode`][from_u8_exit_code]
860 - [`Not for !` (the "never" type)][not_never]
861 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
862 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
866 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
867 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
868 - [Stabilize namespaced and weak dependency features.][cargo/10269]
869 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
870 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
874 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
875 - [Drop rustc-docs from complete profile][93742]
876 - [bootstrap: tidy up flag handling for llvm build][93918]
880 - [Remove compiler-rt linking hack on Android][83822]
881 - [Mitigations for platforms with non-monotonic clocks have been removed from
882 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
883 instant is not guaranteed to be greater than an earlier instant anymore.
884 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
885 saturating to `0` instead][89926]. In the real world the panic happened mostly
886 on platforms with buggy monotonic clock implementations rather than catching
887 programming errors like reversing the start and end times. Such programming
888 errors will now results in `0` rather than a panic.
889 - In a future release we're planning to increase the baseline requirements for
890 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
891 your feedback in [PR #95026][95026].
896 These changes provide no direct user facing benefits, but represent significant
897 improvements to the internals and overall performance of rustc
900 - [Switch all libraries to the 2021 edition][92068]
902 [83822]: https://github.com/rust-lang/rust/pull/83822
903 [86374]: https://github.com/rust-lang/rust/pull/86374
904 [87487]: https://github.com/rust-lang/rust/pull/87487
905 [89621]: https://github.com/rust-lang/rust/pull/89621
906 [89926]: https://github.com/rust-lang/rust/pull/89926
907 [90132]: https://github.com/rust-lang/rust/pull/90132
908 [90247]: https://github.com/rust-lang/rust/pull/90247
909 [91606]: https://github.com/rust-lang/rust/pull/91606
910 [92068]: https://github.com/rust-lang/rust/pull/92068
911 [92300]: https://github.com/rust-lang/rust/pull/92300
912 [92357]: https://github.com/rust-lang/rust/pull/92357
913 [92383]: https://github.com/rust-lang/rust/pull/92383
914 [92630]: https://github.com/rust-lang/rust/pull/92630
915 [92670]: https://github.com/rust-lang/rust/pull/92670
916 [92800]: https://github.com/rust-lang/rust/pull/92800
917 [92933]: https://github.com/rust-lang/rust/pull/92933
918 [93566]: https://github.com/rust-lang/rust/pull/93566
919 [93577]: https://github.com/rust-lang/rust/pull/93577
920 [93658]: https://github.com/rust-lang/rust/pull/93658
921 [93742]: https://github.com/rust-lang/rust/pull/93742
922 [93824]: https://github.com/rust-lang/rust/pull/93824
923 [93918]: https://github.com/rust-lang/rust/pull/93918
924 [95026]: https://github.com/rust-lang/rust/pull/95026
926 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
927 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
928 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
929 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
930 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
932 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
933 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
934 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
935 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
936 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
937 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
938 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
939 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
940 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
941 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
942 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
943 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
944 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
945 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
946 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
947 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
948 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
949 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
950 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
951 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
952 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
953 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
954 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
955 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
956 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
958 Version 1.59.0 (2022-02-24)
959 ==========================
964 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
965 - [Stabilize destructuring assignment][90521]
966 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
967 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
972 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
973 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
974 - [Fix sparc64 ABI for aggregates with floating point members][91003]
975 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
976 - [Add support for riscv64gc-unknown-freebsd][91284]
977 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
978 - [Soft disable incremental compilation][94124]
980 This release disables incremental compilation, unless the user has explicitly
981 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
982 This is due to a known and relatively frequently occurring bug in incremental
983 compilation, which causes builds to issue internal compiler errors. This
984 particular bug is already fixed on nightly, but that fix has not yet rolled out
985 to stable and is deemed too risky for a direct stable backport.
987 As always, we encourage users to test with nightly and report bugs so that we
988 can track failures and fix issues earlier.
990 See [94124] for more details.
992 [94124]: https://github.com/rust-lang/rust/issues/94124
997 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
1002 - [`std::thread::available_parallelism`][available_parallelism]
1003 - [`Result::copied`][result-copied]
1004 - [`Result::cloned`][result-cloned]
1005 - [`arch::asm!`][asm]
1006 - [`arch::global_asm!`][global_asm]
1007 - [`ops::ControlFlow::is_break`][is_break]
1008 - [`ops::ControlFlow::is_continue`][is_continue]
1009 - [`TryFrom<char> for u8`][try_from_char_u8]
1010 - [`char::TryFromCharError`][try_from_char_err]
1011 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
1012 - [`iter::zip`][zip]
1013 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
1014 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
1015 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
1016 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
1017 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
1018 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
1019 - [`DoubleEndedIterator for ToLowercase`][lowercase]
1020 - [`DoubleEndedIterator for ToUppercase`][uppercase]
1021 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
1022 - [`UnwindSafe for Once`][unwindsafe_once]
1023 - [`RefUnwindSafe for Once`][refunwindsafe_once]
1024 - [armv8 neon intrinsics for aarch64][stdarch/1266]
1028 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
1029 - [`mem::MaybeUninit::assume_init`][muninit_init]
1030 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
1031 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
1036 - [Stabilize the `strip` profile option][cargo/10088]
1037 - [Stabilize future-incompat-report][cargo/10165]
1038 - [Support abbreviating `--release` as `-r`][cargo/10133]
1039 - [Support `term.quiet` configuration][cargo/10152]
1040 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
1045 - [Refactor weak symbols in std::sys::unix][90846]
1046 This may add new, versioned, symbols when building with a newer glibc, as the
1047 standard library uses weak linkage rather than dynamically attempting to load
1048 certain symbols at runtime.
1049 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
1050 This adds a future compatibility lint to supporting the use of cfg_attr
1051 wrapping either crate_type or crate_name specification within Rust files;
1052 it is recommended that users migrate to setting the equivalent command line
1054 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
1055 This may expose new names, leading to conflicts with preexisting names in a
1056 given namespace and a compilation failure.
1057 - [Cargo will document libraries before binaries.][cargo/10172]
1058 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
1059 - [Weaken guarantee around advancing underlying iterators in zip][83791]
1060 - [Make split_inclusive() on an empty slice yield an empty output][89825]
1061 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
1062 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
1067 These changes provide no direct user facing benefits, but represent significant
1068 improvements to the internals and overall performance of rustc
1071 - [Fix many cases of normalization-related ICEs][91255]
1072 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
1073 - [Store liveness in interval sets for region inference][90637]
1075 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
1076 unstable feature.][91867]
1078 [91867]: https://github.com/rust-lang/rust/issues/91867
1079 [83744]: https://github.com/rust-lang/rust/pull/83744/
1080 [83791]: https://github.com/rust-lang/rust/pull/83791/
1081 [85013]: https://github.com/rust-lang/rust/pull/85013/
1082 [89825]: https://github.com/rust-lang/rust/pull/89825/
1083 [89999]: https://github.com/rust-lang/rust/pull/89999/
1084 [90128]: https://github.com/rust-lang/rust/pull/90128/
1085 [90207]: https://github.com/rust-lang/rust/pull/90207/
1086 [90521]: https://github.com/rust-lang/rust/pull/90521/
1087 [90586]: https://github.com/rust-lang/rust/pull/90586/
1088 [90637]: https://github.com/rust-lang/rust/pull/90637/
1089 [90833]: https://github.com/rust-lang/rust/pull/90833/
1090 [90846]: https://github.com/rust-lang/rust/pull/90846/
1091 [91003]: https://github.com/rust-lang/rust/pull/91003/
1092 [91172]: https://github.com/rust-lang/rust/pull/91172/
1093 [91255]: https://github.com/rust-lang/rust/pull/91255/
1094 [91284]: https://github.com/rust-lang/rust/pull/91284/
1095 [91535]: https://github.com/rust-lang/rust/pull/91535/
1096 [91593]: https://github.com/rust-lang/rust/pull/91593/
1097 [91728]: https://github.com/rust-lang/rust/pull/91728/
1098 [91878]: https://github.com/rust-lang/rust/pull/91878/
1099 [91896]: https://github.com/rust-lang/rust/pull/91896/
1100 [91926]: https://github.com/rust-lang/rust/pull/91926/
1101 [91984]: https://github.com/rust-lang/rust/pull/91984/
1102 [92020]: https://github.com/rust-lang/rust/pull/92020/
1103 [92034]: https://github.com/rust-lang/rust/pull/92034/
1104 [92137]: https://github.com/rust-lang/rust/pull/92137/
1105 [92483]: https://github.com/rust-lang/rust/pull/92483/
1106 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
1107 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
1108 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
1109 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
1110 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
1111 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
1112 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
1113 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
1115 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
1116 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
1117 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
1118 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1119 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
1120 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
1121 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
1122 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
1123 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
1124 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
1125 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
1126 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
1127 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
1128 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
1129 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
1130 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
1131 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
1132 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
1133 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
1134 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
1135 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
1136 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
1137 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
1138 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
1139 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
1140 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
1142 Version 1.58.1 (2022-01-19)
1143 ===========================
1145 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
1146 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
1147 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
1148 * [Fix wrong error message displayed when some imports are missing][91254]
1149 * [Fix rustfmt not formatting generated files from stdin][92912]
1151 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
1152 [91254]: https://github.com/rust-lang/rust/pull/91254
1153 [92912]: https://github.com/rust-lang/rust/pull/92912
1154 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
1155 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
1157 Version 1.58.0 (2022-01-13)
1158 ==========================
1163 - [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.
1164 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
1165 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
1170 - [Add LLVM CFI support to the Rust compiler][89652]
1171 - [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.
1172 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
1173 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
1174 - [Update the minimum external LLVM to 12][90175]
1175 - [Add `x86_64-unknown-none` at Tier 3*][89062]
1176 - [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.
1177 - [Don't abort compilation after giving a lint error][87337]
1178 - [Error messages point at the source of trait bound obligations in more places][89580]
1180 \* Refer to Rust's [platform support page][platform-support-doc] for more
1181 information on Rust's tiered platform support.
1186 - [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.
1187 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
1188 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
1189 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
1190 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
1191 - [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).
1196 - [`Metadata::is_symlink`]
1197 - [`Path::is_symlink`]
1198 - [`{integer}::saturating_div`]
1199 - [`Option::unwrap_unchecked`]
1200 - [`Result::unwrap_unchecked`]
1201 - [`Result::unwrap_err_unchecked`]
1204 These APIs are now usable in const contexts:
1207 - [`Duration::checked_add`]
1208 - [`Duration::saturating_add`]
1209 - [`Duration::checked_sub`]
1210 - [`Duration::saturating_sub`]
1211 - [`Duration::checked_mul`]
1212 - [`Duration::saturating_mul`]
1213 - [`Duration::checked_div`]
1218 - [Add --message-format for install command][cargo/10107]
1219 - [Warn when alias shadows external subcommand][cargo/10082]
1224 - [Show all Deref implementations recursively in rustdoc][90183]
1225 - [Use computed visibility in rustdoc][88447]
1230 - [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.
1231 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
1232 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
1233 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
1234 - [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.
1235 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
1240 These changes provide no direct user facing benefits, but represent significant
1241 improvements to the internals and overall performance of rustc
1244 - [Implement coherence checks for negative trait impls][90104]
1245 - [Add rustc lint, warning when iterating over hashmaps][89558]
1246 - [Optimize live point computation][90491]
1247 - [Enable verification for 1/32nd of queries loaded from disk][90361]
1248 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
1250 [87337]: https://github.com/rust-lang/rust/pull/87337/
1251 [87467]: https://github.com/rust-lang/rust/pull/87467/
1252 [87704]: https://github.com/rust-lang/rust/pull/87704/
1253 [88041]: https://github.com/rust-lang/rust/pull/88041/
1254 [88447]: https://github.com/rust-lang/rust/pull/88447/
1255 [88601]: https://github.com/rust-lang/rust/pull/88601/
1256 [89062]: https://github.com/rust-lang/rust/pull/89062/
1257 [89174]: https://github.com/rust-lang/rust/pull/89174/
1258 [89551]: https://github.com/rust-lang/rust/pull/89551/
1259 [89558]: https://github.com/rust-lang/rust/pull/89558/
1260 [89580]: https://github.com/rust-lang/rust/pull/89580/
1261 [89652]: https://github.com/rust-lang/rust/pull/89652/
1262 [90041]: https://github.com/rust-lang/rust/pull/90041/
1263 [90058]: https://github.com/rust-lang/rust/pull/90058/
1264 [90104]: https://github.com/rust-lang/rust/pull/90104/
1265 [90117]: https://github.com/rust-lang/rust/pull/90117/
1266 [90175]: https://github.com/rust-lang/rust/pull/90175/
1267 [90183]: https://github.com/rust-lang/rust/pull/90183/
1268 [90297]: https://github.com/rust-lang/rust/pull/90297/
1269 [90329]: https://github.com/rust-lang/rust/pull/90329/
1270 [90361]: https://github.com/rust-lang/rust/pull/90361/
1271 [90417]: https://github.com/rust-lang/rust/pull/90417/
1272 [90473]: https://github.com/rust-lang/rust/pull/90473/
1273 [90491]: https://github.com/rust-lang/rust/pull/90491/
1274 [90733]: https://github.com/rust-lang/rust/pull/90733/
1275 [90833]: https://github.com/rust-lang/rust/pull/90833/
1276 [90846]: https://github.com/rust-lang/rust/pull/90846/
1277 [91026]: https://github.com/rust-lang/rust/pull/91026/
1278 [91207]: https://github.com/rust-lang/rust/pull/91207/
1279 [91255]: https://github.com/rust-lang/rust/pull/91255/
1280 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
1281 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
1282 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
1283 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
1284 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
1285 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
1286 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
1287 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
1288 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
1289 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
1291 Version 1.57.0 (2021-12-02)
1292 ==========================
1297 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
1298 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
1299 - [Allow panicking in constant evaluation.][89508]
1300 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1305 - [Create more accurate debuginfo for vtables.][89597]
1306 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
1307 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
1308 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
1309 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
1311 \* Refer to Rust's [platform support page][platform-support-doc] for more
1312 information on Rust's tiered platform support.
1317 - [Avoid allocations and copying in `Vec::leak`][89337]
1318 - [Add `#[repr(i8)]` to `Ordering`][89507]
1319 - [Optimize `File::read_to_end` and `read_to_string`][89582]
1320 - [Update to Unicode 14.0][89614]
1321 - [Many more functions are marked `#[must_use]`][89692], producing a warning
1322 when ignoring their return value. This helps catch mistakes such as expecting
1323 a function to mutate a value in place rather than return a new value.
1328 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
1329 - [`[T; N]::as_slice`][`array::as_slice`]
1330 - [`collections::TryReserveError`]
1331 - [`HashMap::try_reserve`]
1332 - [`HashSet::try_reserve`]
1333 - [`String::try_reserve`]
1334 - [`String::try_reserve_exact`]
1335 - [`Vec::try_reserve`]
1336 - [`Vec::try_reserve_exact`]
1337 - [`VecDeque::try_reserve`]
1338 - [`VecDeque::try_reserve_exact`]
1339 - [`Iterator::map_while`]
1340 - [`iter::MapWhile`]
1341 - [`proc_macro::is_available`]
1342 - [`Command::get_program`]
1343 - [`Command::get_args`]
1344 - [`Command::get_envs`]
1345 - [`Command::get_current_dir`]
1349 These APIs are now usable in const contexts:
1351 - [`hint::unreachable_unchecked`]
1356 - [Stabilize custom profiles][cargo/9943]
1361 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1362 This will break some builds that set `#![deny(dead_code)]`.
1366 These changes provide no direct user facing benefits, but represent significant
1367 improvements to the internals and overall performance of rustc
1370 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1372 [85200]: https://github.com/rust-lang/rust/pull/85200/
1373 [86191]: https://github.com/rust-lang/rust/pull/86191/
1374 [87220]: https://github.com/rust-lang/rust/pull/87220/
1375 [87260]: https://github.com/rust-lang/rust/pull/87260/
1376 [88321]: https://github.com/rust-lang/rust/pull/88321/
1377 [88529]: https://github.com/rust-lang/rust/pull/88529/
1378 [88690]: https://github.com/rust-lang/rust/pull/88690/
1379 [88952]: https://github.com/rust-lang/rust/pull/88952/
1380 [89337]: https://github.com/rust-lang/rust/pull/89337/
1381 [89507]: https://github.com/rust-lang/rust/pull/89507/
1382 [89508]: https://github.com/rust-lang/rust/pull/89508/
1383 [89582]: https://github.com/rust-lang/rust/pull/89582/
1384 [89597]: https://github.com/rust-lang/rust/pull/89597/
1385 [89614]: https://github.com/rust-lang/rust/pull/89614/
1386 [89692]: https://github.com/rust-lang/rust/issues/89692/
1387 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1388 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1389 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1390 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1391 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1392 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1393 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1394 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1395 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1396 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1397 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1398 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1399 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1400 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1401 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1402 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1403 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1404 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1405 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1406 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1407 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1409 Version 1.56.1 (2021-11-01)
1410 ===========================
1412 - New lints to detect the presence of bidirectional-override Unicode
1413 codepoints in the compiled source code ([CVE-2021-42574])
1415 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1417 Version 1.56.0 (2021-10-21)
1418 ========================
1423 - [The 2021 Edition is now stable.][rust#88100]
1424 See [the edition guide][rust-2021-edition-guide] for more details.
1425 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1426 - [Union field access is permitted in `const fn`.][rust#85769]
1428 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1433 - [Upgrade to LLVM 13.][rust#87570]
1434 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1435 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1436 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1437 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1438 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1439 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1440 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1442 \* Refer to Rust's [platform support page][platform-support-doc] for more
1443 information on Rust's tiered platform support.
1448 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1449 The Windows console still requires valid Unicode, but this change allows
1450 splitting a UTF-8 character across multiple write calls. This allows, for
1451 instance, programs that just read and write data buffers (e.g. copying a file
1452 to stdout) without regard for Unicode or character boundaries.
1453 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1454 For this use case, atomics scale much better under contention.
1455 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1456 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1457 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1458 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1459 - [Treat invalid environment variable names as non-existent.][rust#86183]
1460 Previously, the environment functions would panic if given a variable name
1461 with an internal null character or equal sign (`=`). Now, these functions will
1462 just treat such names as non-existent variables, since the OS cannot represent
1463 the existence of a variable with such a name.
1468 - [`std::os::unix::fs::chroot`]
1469 - [`UnsafeCell::raw_get`]
1470 - [`BufWriter::into_parts`]
1471 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1472 These APIs were previously stable in `std`, but are now also available in `core`.
1473 - [`Vec::shrink_to`]
1474 - [`String::shrink_to`]
1475 - [`OsString::shrink_to`]
1476 - [`PathBuf::shrink_to`]
1477 - [`BinaryHeap::shrink_to`]
1478 - [`VecDeque::shrink_to`]
1479 - [`HashMap::shrink_to`]
1480 - [`HashSet::shrink_to`]
1482 These APIs are now usable in const contexts:
1484 - [`std::mem::transmute`]
1485 - [`[T]::first`][`slice::first`]
1486 - [`[T]::split_first`][`slice::split_first`]
1487 - [`[T]::last`][`slice::last`]
1488 - [`[T]::split_last`][`slice::split_last`]
1493 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1494 This has no effect at present on dependency version selection.
1495 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1496 that support Rust code to include a crate's specified minimum version in the test matrix for that
1502 - [Update to new argument parsing rules on Windows.][rust#87580]
1503 This adjusts Rust's standard library to match the behavior of the standard
1504 libraries for C/C++. The rules have changed slightly over time, and this PR
1505 brings us to the latest set of rules (changed in 2008).
1506 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1507 This was already not supported by LLVM; this change surfaces this lack of
1508 support with a better error message.
1509 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1510 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1511 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1512 may return different values on glibc <= 2.24.][rust#81825]
1513 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1514 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1515 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1516 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1520 These changes provide no direct user facing benefits, but represent significant
1521 improvements to the internals and overall performance of rustc
1524 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1525 This improves the performance of most Rust builds.
1526 - [Unify representation of macros in internal data structures.][rust#88019]
1527 This change fixes a host of bugs with the handling of macros by the compiler,
1530 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1531 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1532 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1533 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1534 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1535 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1536 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1537 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1538 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1539 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1540 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1541 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1542 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1543 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1544 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1545 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1546 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1547 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1548 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1549 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1550 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1551 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1552 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1553 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1554 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1555 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1556 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1557 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1558 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1559 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1560 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1561 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1562 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1563 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1564 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1565 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1566 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1567 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1568 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1569 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1570 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1571 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1573 Version 1.55.0 (2021-09-09)
1574 ============================
1578 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1579 will end at the maximum value of the integer.][83918]
1580 - [You can now explicitly import the prelude of different editions
1581 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1585 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1587 \* Refer to Rust's [platform support page][platform-support-doc] for more
1588 information on Rust's tiered platform support.
1593 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1594 These improvements should in general provide faster string parsing of floats,
1595 no longer reject certain valid floating point values, and reduce
1596 the produced code size for non-stripped artifacts.
1597 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1604 - [`IntoInnerError::into_error`]
1605 - [`IntoInnerError::into_parts`]
1606 - [`MaybeUninit::assume_init_mut`]
1607 - [`MaybeUninit::assume_init_ref`]
1608 - [`MaybeUninit::write`]
1610 - [`ops::ControlFlow`]
1612 - [`x86::_bittestandcomplement`]
1613 - [`x86::_bittestandreset`]
1614 - [`x86::_bittestandset`]
1615 - [`x86_64::_bittest64`]
1616 - [`x86_64::_bittestandcomplement64`]
1617 - [`x86_64::_bittestandreset64`]
1618 - [`x86_64::_bittestandset64`]
1620 The following previously stable functions are now `const`.
1622 - [`str::from_utf8_unchecked`]
1627 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1628 rustc in parallel such as when using `cargo test`.][cargo/9675]
1629 - [The package definition in `cargo metadata` now includes the `"default_run"`
1630 field from the manifest.][cargo/9550]
1631 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1632 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1633 of packages.][cargo/9663]
1637 - [Added "Go to item on exact match" search option.][85876]
1638 - [The "Implementors" section on traits no longer shows redundant
1639 method definitions.][85970]
1640 - [Trait implementations are toggled open by default.][86260] This should make the
1641 implementations more searchable by tools like `CTRL+F` in your browser.
1642 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1643 through type aliases.][86334]
1644 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1645 "Trait Implementations" section.][86513]
1650 - [std functions that return an `io::Error` will no longer use the
1651 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1652 kinds of errors could be categorised [into newer more specific `ErrorKind`
1653 variants][79965], and that they do not represent a user error.
1654 - [Using environment variable names with `process::Command` on Windows now
1655 behaves as expected.][85270] Previously using envionment variables with
1656 `Command` would cause them to be ASCII-uppercased.
1657 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1658 with `rustdoc::`][86849]
1659 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1660 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1661 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1664 [86849]: https://github.com/rust-lang/rust/pull/86849
1665 [86513]: https://github.com/rust-lang/rust/pull/86513
1666 [86334]: https://github.com/rust-lang/rust/pull/86334
1667 [86260]: https://github.com/rust-lang/rust/pull/86260
1668 [85970]: https://github.com/rust-lang/rust/pull/85970
1669 [85876]: https://github.com/rust-lang/rust/pull/85876
1670 [83572]: https://github.com/rust-lang/rust/pull/83572
1671 [86294]: https://github.com/rust-lang/rust/pull/86294
1672 [86858]: https://github.com/rust-lang/rust/pull/86858
1673 [86761]: https://github.com/rust-lang/rust/pull/86761
1674 [85746]: https://github.com/rust-lang/rust/pull/85746
1675 [85270]: https://github.com/rust-lang/rust/pull/85270
1676 [83918]: https://github.com/rust-lang/rust/pull/83918
1677 [79965]: https://github.com/rust-lang/rust/pull/79965
1678 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1679 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1680 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1681 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1682 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1683 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1684 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1685 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1686 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1687 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1688 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1689 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1690 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1691 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1692 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1693 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1694 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1695 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1696 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1697 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1698 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1699 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1702 Version 1.54.0 (2021-07-29)
1703 ============================
1706 -----------------------
1708 - [You can now use macros for values in some built-in attributes.][83366]
1709 This primarily allows you to call macros within the `#[doc]` attribute. For
1710 example, to include external documentation in your crate, you can now write
1713 #![doc = include_str!("README.md")]
1716 - [You can now cast between unsized slice types (and types which contain
1717 unsized slices) in `const fn`.][85078]
1718 - [You can now use multiple generic lifetimes with `impl Trait` where the
1719 lifetimes don't explicitly outlive another.][84701] In code this means
1720 that you can now have `impl Trait<'a, 'b>` where as before you could
1721 only have `impl Trait<'a, 'b> where 'b: 'a`.
1724 -----------------------
1726 - [Rustc will now search for custom JSON targets in
1727 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1728 directory.][83800] You can find your sysroot directory by running
1729 `rustc --print sysroot`.
1730 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1731 - [You can now use `#[target_feature]` on safe functions when targeting
1732 WebAssembly platforms.][84988]
1733 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1734 - [Added tier 3\* support for `bpfel-unknown-none`
1735 and `bpfeb-unknown-none`.][79608]
1736 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1738 \* Refer to Rust's [platform support page][platform-support-doc] for more
1739 information on Rust's tiered platform support.
1742 -----------------------
1744 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1745 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1746 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1747 - [The implementations of vendor intrinsics in core::arch have been
1748 significantly refactored.][83278] The main user-visible changes are
1749 a 50% reduction in the size of libcore.rlib and stricter validation
1750 of constant operands passed to intrinsics. The latter is technically
1751 a breaking change, but allows Rust to more closely match the C vendor
1757 - [`BTreeMap::into_keys`]
1758 - [`BTreeMap::into_values`]
1759 - [`HashMap::into_keys`]
1760 - [`HashMap::into_values`]
1762 - [`VecDeque::binary_search`]
1763 - [`VecDeque::binary_search_by`]
1764 - [`VecDeque::binary_search_by_key`]
1765 - [`VecDeque::partition_point`]
1770 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1771 the dependency graph.][cargo/9520]
1772 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1773 in the tree ][cargo/9499]
1774 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1775 macro dependencies.][cargo/9488]
1776 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1777 This variable points to a directory that integration tests and benches
1778 can use as a "scratchpad" for testing filesystem operations.
1782 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1783 - [Previously unsound code is no longer permitted where different constructors in branches
1784 could require different lifetimes.][85574]
1785 - As previously mentioned the [`std::arch` intrinsics now uses stricter const checking][83278]
1786 than before and may reject some previously accepted code.
1787 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1788 when compiled with `codegen-units = 1`.][86063]
1790 [85574]: https://github.com/rust-lang/rust/issues/85574
1791 [86831]: https://github.com/rust-lang/rust/issues/86831
1792 [86063]: https://github.com/rust-lang/rust/issues/86063
1793 [79608]: https://github.com/rust-lang/rust/pull/79608
1794 [84988]: https://github.com/rust-lang/rust/pull/84988
1795 [84701]: https://github.com/rust-lang/rust/pull/84701
1796 [84072]: https://github.com/rust-lang/rust/pull/84072
1797 [85745]: https://github.com/rust-lang/rust/pull/85745
1798 [84744]: https://github.com/rust-lang/rust/pull/84744
1799 [85078]: https://github.com/rust-lang/rust/pull/85078
1800 [84717]: https://github.com/rust-lang/rust/pull/84717
1801 [83800]: https://github.com/rust-lang/rust/pull/83800
1802 [83366]: https://github.com/rust-lang/rust/pull/83366
1803 [83278]: https://github.com/rust-lang/rust/pull/83278
1804 [85292]: https://github.com/rust-lang/rust/pull/85292
1805 [82834]: https://github.com/rust-lang/rust/pull/82834
1806 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1807 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1808 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1809 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1810 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1811 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1812 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1813 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1814 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1815 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1816 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1818 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1820 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1822 Version 1.53.0 (2021-06-17)
1823 ============================
1826 -----------------------
1827 - [You can now use unicode for identifiers.][83799] This allows multilingual
1828 identifiers but still doesn't allow glyphs that are not considered characters
1829 such as `◆` or `🦀`. More specifically you can now use any identifier that
1830 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1831 is the same standard as languages like Python, however Rust uses NFC
1832 normalization which may be different from other languages.
1833 - [You can now specify "or patterns" inside pattern matches.][79278]
1834 Previously you could only use `|` (OR) on complete patterns. E.g.
1838 matches!(x, Some(1) | Some(2));
1840 matches!(x, Some(1 | 2));
1842 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1843 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1844 to change semantics to being a pattern fragment in a future edition.
1847 -----------------------
1848 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1849 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1850 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1852 \* Refer to Rust's [platform support page][platform-support-doc] for more
1853 information on Rust's tiered platform support.
1856 -----------------------
1857 - [Abort messages will now forward to `android_set_abort_message` on
1858 Android platforms when available.][81469]
1859 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1860 - [Arrays of any length now implement `IntoIterator`.][84147]
1861 Currently calling `.into_iter()` as a method on an array will
1862 return `impl Iterator<Item=&T>`, but this may change in a
1863 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1864 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1865 - [`leading_zeros`, and `trailing_zeros` are now available on all
1866 `NonZero` integer types.][84082]
1867 - [`{f32, f64}::from_str` now parse and print special values
1868 (`NaN`, `-0`) according to IEEE 754.][78618]
1869 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1870 - [Add the `BITS` associated constant to all numeric types.][82565]
1874 - [`AtomicBool::fetch_update`]
1875 - [`AtomicPtr::fetch_update`]
1876 - [`BTreeMap::retain`]
1877 - [`BTreeSet::retain`]
1878 - [`BufReader::seek_relative`]
1879 - [`DebugStruct::non_exhaustive`]
1881 - [`Duration::ZERO`]
1882 - [`Duration::is_zero`]
1883 - [`Duration::saturating_add`]
1884 - [`Duration::saturating_mul`]
1885 - [`Duration::saturating_sub`]
1886 - [`ErrorKind::Unsupported`]
1887 - [`Option::insert`]
1888 - [`Ordering::is_eq`]
1889 - [`Ordering::is_ge`]
1890 - [`Ordering::is_gt`]
1891 - [`Ordering::is_le`]
1892 - [`Ordering::is_lt`]
1893 - [`Ordering::is_ne`]
1894 - [`OsStr::is_ascii`]
1895 - [`OsStr::make_ascii_lowercase`]
1896 - [`OsStr::make_ascii_uppercase`]
1897 - [`OsStr::to_ascii_lowercase`]
1898 - [`OsStr::to_ascii_uppercase`]
1899 - [`Peekable::peek_mut`]
1900 - [`Rc::decrement_strong_count`]
1901 - [`Rc::increment_strong_count`]
1902 - [`Vec::extend_from_within`]
1903 - [`array::from_mut`]
1904 - [`array::from_ref`]
1905 - [`cmp::max_by_key`]
1907 - [`cmp::min_by_key`]
1909 - [`f32::is_subnormal`]
1910 - [`f64::is_subnormal`]
1913 -----------------------
1914 - [Cargo now supports git repositories where the default `HEAD` branch is not
1915 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1916 which can handle default branches correctly.
1917 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1918 - [The `authors` field is no longer included in `Cargo.toml` for new
1919 projects.][cargo/9282]
1922 -----------------------
1923 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1924 without hyperlinks.][81764]
1928 - [Implement token-based handling of attributes during expansion][82608]
1929 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1930 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1931 to confusion and potential security vulnerabilities and [is no
1932 longer recommended][ietf6943].
1933 - [The added `BITS` constant may conflict with external definitions.][85667]
1934 In particular, this was known to be a problem in the `lexical-core` crate,
1935 but they have published fixes for semantic versions 0.4 through 0.7. To
1936 update this dependency alone, use `cargo update -p lexical-core`.
1937 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1941 These changes provide no direct user facing benefits, but represent significant
1942 improvements to the internals and overall performance of rustc and
1945 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1946 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1947 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1948 - [Rework rustdoc const type][82873]
1950 [85667]: https://github.com/rust-lang/rust/pull/85667
1951 [83386]: https://github.com/rust-lang/rust/pull/83386
1952 [82771]: https://github.com/rust-lang/rust/pull/82771
1953 [84147]: https://github.com/rust-lang/rust/pull/84147
1954 [84082]: https://github.com/rust-lang/rust/pull/84082
1955 [83799]: https://github.com/rust-lang/rust/pull/83799
1956 [83681]: https://github.com/rust-lang/rust/pull/83681
1957 [83652]: https://github.com/rust-lang/rust/pull/83652
1958 [83387]: https://github.com/rust-lang/rust/pull/83387
1959 [82873]: https://github.com/rust-lang/rust/pull/82873
1960 [82864]: https://github.com/rust-lang/rust/pull/82864
1961 [82608]: https://github.com/rust-lang/rust/pull/82608
1962 [82565]: https://github.com/rust-lang/rust/pull/82565
1963 [80525]: https://github.com/rust-lang/rust/pull/80525
1964 [79278]: https://github.com/rust-lang/rust/pull/79278
1965 [78618]: https://github.com/rust-lang/rust/pull/78618
1966 [77704]: https://github.com/rust-lang/rust/pull/77704
1967 [83941]: https://github.com/rust-lang/rust/pull/83941
1968 [83065]: https://github.com/rust-lang/rust/pull/83065
1969 [81764]: https://github.com/rust-lang/rust/pull/81764
1970 [81469]: https://github.com/rust-lang/rust/pull/81469
1971 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1972 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1973 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1974 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1975 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1976 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1977 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1978 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1979 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1980 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1981 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1982 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1983 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1984 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1985 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1986 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1987 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1988 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1989 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1990 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1991 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1992 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1993 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1994 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1995 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1996 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1997 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1998 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1999 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
2000 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2001 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
2002 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
2003 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
2004 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
2005 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
2006 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
2007 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
2008 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
2009 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2010 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
2011 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
2014 Version 1.52.1 (2021-05-10)
2015 ============================
2017 This release disables incremental compilation, unless the user has explicitly
2018 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
2020 This is due to the widespread, and frequently occurring, breakage encountered by
2021 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
2022 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
2023 newly added incremental verification are still present in past stable versions,
2024 and are not yet fixed on any channel. These bugs can lead to miscompilation of
2027 These problems only affect incremental builds, so release builds with Cargo
2028 should not be affected unless the user has explicitly opted into incremental.
2029 Debug and check builds are affected.
2031 See [84970] for more details.
2033 [84970]: https://github.com/rust-lang/rust/issues/84970
2035 Version 1.52.0 (2021-05-06)
2036 ============================
2040 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
2041 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
2042 is allowed by default, and may become a warning or hard error in a
2044 - [You can now cast mutable references to arrays to a pointer of the same type as
2045 the element.][81479]
2049 - [Upgraded the default LLVM to LLVM 12.][81451]
2051 Added tier 3\* support for the following targets.
2053 - [`s390x-unknown-linux-musl`][82166]
2054 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
2055 - [`powerpc-unknown-openbsd`][82733]
2057 \* Refer to Rust's [platform support page][platform-support-doc] for more
2058 information on Rust's tiered platform support.
2062 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
2063 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
2064 - [`Arc<impl Error>` now implements `error::Error`.][80553]
2065 - [All integer division and remainder operations are now `const`.][80962]
2069 - [`Arguments::as_str`]
2071 - [`char::REPLACEMENT_CHARACTER`]
2072 - [`char::UNICODE_VERSION`]
2073 - [`char::decode_utf16`]
2074 - [`char::from_digit`]
2075 - [`char::from_u32_unchecked`]
2076 - [`char::from_u32`]
2077 - [`slice::partition_point`]
2078 - [`str::rsplit_once`]
2079 - [`str::split_once`]
2081 The following previously stable APIs are now `const`.
2083 - [`char::len_utf8`]
2084 - [`char::len_utf16`]
2085 - [`char::to_ascii_uppercase`]
2086 - [`char::to_ascii_lowercase`]
2087 - [`char::eq_ignore_ascii_case`]
2088 - [`u8::to_ascii_uppercase`]
2089 - [`u8::to_ascii_lowercase`]
2090 - [`u8::eq_ignore_ascii_case`]
2094 - [Rustdoc lints are now treated as a tool lint, meaning that
2095 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
2096 Using the old style is still allowed, and will become a warning in
2098 - [Rustdoc now supports argument files.][82261]
2099 - [Rustdoc now generates smart punctuation for documentation.][79423]
2100 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
2108 - [You can now pass multiple filters to tests.][81356] E.g.
2109 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
2110 - [Rustup now distributes PDB symbols for the `std` library on Windows,
2111 allowing you to see `std` symbols when debugging.][82218]
2115 These changes provide no direct user facing benefits, but represent significant
2116 improvements to the internals and overall performance of rustc and
2119 - [Check the result cache before the DepGraph when ensuring queries][81855]
2120 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
2121 - [Only store a LocalDefId in some HIR nodes][81611]
2122 - [Store HIR attributes in a side table][79519]
2126 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
2127 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
2128 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
2129 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
2130 languages in code blocks.][78429]
2131 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
2132 - [Changes in how proc macros handle whitespace may lead to panics when used
2133 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
2134 - [Turn `#[derive]` into a regular macro attribute][79078]
2136 [84136]: https://github.com/rust-lang/rust/issues/84136
2137 [80763]: https://github.com/rust-lang/rust/pull/80763
2138 [82166]: https://github.com/rust-lang/rust/pull/82166
2139 [82121]: https://github.com/rust-lang/rust/pull/82121
2140 [81879]: https://github.com/rust-lang/rust/pull/81879
2141 [82261]: https://github.com/rust-lang/rust/pull/82261
2142 [82218]: https://github.com/rust-lang/rust/pull/82218
2143 [82216]: https://github.com/rust-lang/rust/pull/82216
2144 [82202]: https://github.com/rust-lang/rust/pull/82202
2145 [81855]: https://github.com/rust-lang/rust/pull/81855
2146 [81766]: https://github.com/rust-lang/rust/pull/81766
2147 [81744]: https://github.com/rust-lang/rust/pull/81744
2148 [81611]: https://github.com/rust-lang/rust/pull/81611
2149 [81479]: https://github.com/rust-lang/rust/pull/81479
2150 [81451]: https://github.com/rust-lang/rust/pull/81451
2151 [81356]: https://github.com/rust-lang/rust/pull/81356
2152 [80962]: https://github.com/rust-lang/rust/pull/80962
2153 [80553]: https://github.com/rust-lang/rust/pull/80553
2154 [80527]: https://github.com/rust-lang/rust/pull/80527
2155 [79519]: https://github.com/rust-lang/rust/pull/79519
2156 [79423]: https://github.com/rust-lang/rust/pull/79423
2157 [79208]: https://github.com/rust-lang/rust/pull/79208
2158 [78429]: https://github.com/rust-lang/rust/pull/78429
2159 [82733]: https://github.com/rust-lang/rust/pull/82733
2160 [82594]: https://github.com/rust-lang/rust/pull/82594
2161 [79078]: https://github.com/rust-lang/rust/pull/79078
2162 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
2163 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
2164 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
2165 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
2166 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
2167 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
2168 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
2169 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
2170 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
2171 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
2172 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
2173 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
2174 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
2175 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
2176 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
2177 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
2178 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
2179 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
2180 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
2181 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
2182 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
2183 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
2185 Version 1.51.0 (2021-03-25)
2186 ============================
2190 - [You can now parameterize items such as functions, traits, and `struct`s by constant
2191 values in addition to by types and lifetimes.][79135] Also known as "const generics"
2192 E.g. you can now write the following. Note: Only values of primitive integers,
2193 `bool`, or `char` types are currently permitted.
2195 struct GenericArray<T, const LENGTH: usize> {
2199 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
2200 const fn last(&self) -> Option<&T> {
2204 Some(&self.inner[LENGTH - 1])
2214 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
2215 This option controls whether debug information is split across multiple files
2216 or packed into a single file. **Note** This option is unstable on other platforms.
2217 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
2218 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
2219 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
2220 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
2222 \* Refer to Rust's [platform support page][platform-support-doc] for more
2223 information on Rust's tiered platform support.
2228 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
2229 - [`str` now implements `AsMut<str>`.][80279]
2230 - [`u64` and `u128` now implement `From<char>`.][79502]
2231 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
2232 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
2233 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
2234 - [`io::Empty` now implements `io::Seek`.][78044]
2235 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
2236 `T: ?Sized` types.][80764]
2237 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
2243 - [`Arc::decrement_strong_count`]
2244 - [`Arc::increment_strong_count`]
2245 - [`Once::call_once_force`]
2246 - [`Peekable::next_if_eq`]
2247 - [`Peekable::next_if`]
2248 - [`Seek::stream_position`]
2249 - [`array::IntoIter`]
2250 - [`panic::panic_any`]
2252 - [`ptr::addr_of_mut!`]
2253 - [`slice::fill_with`]
2254 - [`slice::split_inclusive_mut`]
2255 - [`slice::split_inclusive`]
2256 - [`slice::strip_prefix`]
2257 - [`slice::strip_suffix`]
2258 - [`str::split_inclusive`]
2259 - [`sync::OnceState`]
2261 - [`VecDeque::range`]
2262 - [`VecDeque::range_mut`]
2266 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
2267 codegen option.][cargo/9112]
2268 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
2269 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
2270 to avoid unifying features of dependencies where that unification could be unwanted.
2271 Such as using the same dependency with a `std` feature in a build scripts and
2272 proc-macros, while using the `no-std` feature in the final binary. See the
2273 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
2278 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
2279 - [You can now provide a `--default-theme` flag which sets the default theme to use for
2280 documentation.][79642]
2282 Various improvements to intra-doc links:
2284 - [You can link to non-path primitives such as `slice`.][80181]
2285 - [You can link to associated items.][74489]
2286 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
2290 - [You can now pass `--include-ignored` to tests (e.g. with
2291 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
2296 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
2297 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
2299 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
2300 for the distributed artifacts.][81521]
2301 - `armv5te-unknown-linux-gnueabi`
2302 - `sparc64-unknown-linux-gnu`
2303 - `thumbv7neon-unknown-linux-gnueabihf`
2304 - `armv7-unknown-linux-gnueabi`
2305 - `x86_64-unknown-linux-gnux32`
2306 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
2311 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
2313 [79135]: https://github.com/rust-lang/rust/pull/79135
2314 [74489]: https://github.com/rust-lang/rust/pull/74489
2315 [76934]: https://github.com/rust-lang/rust/pull/76934
2316 [79570]: https://github.com/rust-lang/rust/pull/79570
2317 [80181]: https://github.com/rust-lang/rust/pull/80181
2318 [79642]: https://github.com/rust-lang/rust/pull/79642
2319 [80945]: https://github.com/rust-lang/rust/pull/80945
2320 [80279]: https://github.com/rust-lang/rust/pull/80279
2321 [80053]: https://github.com/rust-lang/rust/pull/80053
2322 [79502]: https://github.com/rust-lang/rust/pull/79502
2323 [75180]: https://github.com/rust-lang/rust/pull/75180
2324 [81521]: https://github.com/rust-lang/rust/pull/81521
2325 [80968]: https://github.com/rust-lang/rust/pull/80968
2326 [80959]: https://github.com/rust-lang/rust/pull/80959
2327 [80718]: https://github.com/rust-lang/rust/pull/80718
2328 [80653]: https://github.com/rust-lang/rust/pull/80653
2329 [80579]: https://github.com/rust-lang/rust/pull/80579
2330 [79998]: https://github.com/rust-lang/rust/pull/79998
2331 [78044]: https://github.com/rust-lang/rust/pull/78044
2332 [81455]: https://github.com/rust-lang/rust/pull/81455
2333 [80764]: https://github.com/rust-lang/rust/pull/80764
2334 [80749]: https://github.com/rust-lang/rust/pull/80749
2335 [80662]: https://github.com/rust-lang/rust/pull/80662
2336 [79134]: https://github.com/rust-lang/rust/pull/79134
2337 [80966]: https://github.com/rust-lang/rust/pull/80966
2338 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
2339 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2340 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2341 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2342 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2343 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2344 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2345 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2346 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2347 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2348 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2349 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2350 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2351 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2352 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2353 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2354 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2355 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2356 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2357 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2358 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2359 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2360 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2362 Version 1.50.0 (2021-02-11)
2363 ============================
2366 -----------------------
2367 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2368 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2369 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2372 -----------------------
2373 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2374 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2375 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2376 - [Dropped support for all cloudabi targets.][78439]
2378 \* Refer to Rust's [platform support page][platform-support-doc] for more
2379 information on Rust's tiered platform support.
2382 -----------------------
2384 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2385 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2386 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2387 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2388 up the same amount of space as `File`.
2394 - [`btree_map::Entry::or_insert_with_key`]
2397 - [`hash_map::Entry::or_insert_with_key`]
2401 - [`UnsafeCell::get_mut`]
2403 The following previously stable methods are now `const`.
2405 - [`IpAddr::is_ipv4`]
2406 - [`IpAddr::is_ipv6`]
2407 - [`IpAddr::is_unspecified`]
2408 - [`IpAddr::is_loopback`]
2409 - [`IpAddr::is_multicast`]
2410 - [`Ipv4Addr::octets`]
2411 - [`Ipv4Addr::is_loopback`]
2412 - [`Ipv4Addr::is_private`]
2413 - [`Ipv4Addr::is_link_local`]
2414 - [`Ipv4Addr::is_multicast`]
2415 - [`Ipv4Addr::is_broadcast`]
2416 - [`Ipv4Addr::is_documentation`]
2417 - [`Ipv4Addr::to_ipv6_compatible`]
2418 - [`Ipv4Addr::to_ipv6_mapped`]
2419 - [`Ipv6Addr::segments`]
2420 - [`Ipv6Addr::is_unspecified`]
2421 - [`Ipv6Addr::is_loopback`]
2422 - [`Ipv6Addr::is_multicast`]
2423 - [`Ipv6Addr::to_ipv4`]
2426 - [`Layout::from_size_align`]
2427 - `pow` for all integer types.
2428 - `checked_pow` for all integer types.
2429 - `saturating_pow` for all integer types.
2430 - `wrapping_pow` for all integer types.
2431 - `next_power_of_two` for all unsigned integer types.
2432 - `checked_next_power_of_two` for all unsigned integer types.
2435 -----------------------
2437 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2438 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2439 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2440 contents of that directory for changes.][cargo/8973]
2441 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2446 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2447 - [Running tests will now print the total time taken to execute.][75752]
2452 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2453 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2454 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2455 unhygenic `macro_rules!` macros.][79472]
2456 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2457 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2458 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2459 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2460 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2461 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2463 [74989]: https://github.com/rust-lang/rust/pull/74989
2464 [79261]: https://github.com/rust-lang/rust/pull/79261
2465 [79896]: https://github.com/rust-lang/rust/pull/79896
2466 [79484]: https://github.com/rust-lang/rust/pull/79484
2467 [79472]: https://github.com/rust-lang/rust/pull/79472
2468 [79270]: https://github.com/rust-lang/rust/pull/79270
2469 [79003]: https://github.com/rust-lang/rust/pull/79003
2470 [78864]: https://github.com/rust-lang/rust/pull/78864
2471 [78636]: https://github.com/rust-lang/rust/pull/78636
2472 [78439]: https://github.com/rust-lang/rust/pull/78439
2473 [78343]: https://github.com/rust-lang/rust/pull/78343
2474 [78296]: https://github.com/rust-lang/rust/pull/78296
2475 [78068]: https://github.com/rust-lang/rust/pull/78068
2476 [75752]: https://github.com/rust-lang/rust/pull/75752
2477 [74699]: https://github.com/rust-lang/rust/pull/74699
2478 [78142]: https://github.com/rust-lang/rust/pull/78142
2479 [77484]: https://github.com/rust-lang/rust/pull/77484
2480 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2481 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2482 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2483 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2484 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2485 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2486 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2487 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2488 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2489 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2490 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2491 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2492 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2493 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2494 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2495 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2496 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2497 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2498 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2499 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2500 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2501 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2502 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2503 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2504 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2505 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2506 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2507 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2508 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2509 [`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
2510 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2511 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2512 [`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
2513 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2516 Version 1.49.0 (2020-12-31)
2517 ============================
2520 -----------------------
2522 - [Unions can now implement `Drop`, and you can now have a field in a union
2523 with `ManuallyDrop<T>`.][77547]
2524 - [You can now cast uninhabited enums to integers.][76199]
2525 - [You can now bind by reference and by move in patterns.][76119] This
2526 allows you to selectively borrow individual components of a type. E.g.
2534 let person = Person {
2535 name: String::from("Alice"),
2539 // `name` is moved out of person, but `age` is referenced.
2540 let Person { name, ref age } = person;
2541 println!("{} {}", name, age);
2545 -----------------------
2547 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2548 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2549 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2550 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2551 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2552 - [Output from threads spawned in tests is now captured.][78227]
2553 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2555 \* Refer to Rust's [platform support page][platform-support-doc] for more
2556 information on Rust's tiered platform support.
2559 -----------------------
2561 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2562 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2567 - [`slice::select_nth_unstable`]
2568 - [`slice::select_nth_unstable_by`]
2569 - [`slice::select_nth_unstable_by_key`]
2571 The following previously stable methods are now `const`.
2573 - [`Poll::is_ready`]
2574 - [`Poll::is_pending`]
2577 -----------------------
2578 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2579 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2580 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2581 variable will be set if the crate being built is one the user selected to build, either
2582 with `-p` or through defaults.
2583 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2589 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2590 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2591 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2592 Previously such invalid or unused attributes could be ignored.
2593 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2594 read [this post about the changes][rustdoc-ws-post] for more details.
2595 - [Trait bounds are no longer inferred for associated types.][79904]
2599 These changes provide no direct user facing benefits, but represent significant
2600 improvements to the internals and overall performance of rustc and
2603 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2604 Local Storage model.][78201]
2605 - [Calculate visibilities once in resolve.][78077]
2606 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2607 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2610 [75991]: https://github.com/rust-lang/rust/pull/75991
2611 [78951]: https://github.com/rust-lang/rust/pull/78951
2612 [78848]: https://github.com/rust-lang/rust/pull/78848
2613 [78746]: https://github.com/rust-lang/rust/pull/78746
2614 [78376]: https://github.com/rust-lang/rust/pull/78376
2615 [78228]: https://github.com/rust-lang/rust/pull/78228
2616 [78227]: https://github.com/rust-lang/rust/pull/78227
2617 [78201]: https://github.com/rust-lang/rust/pull/78201
2618 [78109]: https://github.com/rust-lang/rust/pull/78109
2619 [78077]: https://github.com/rust-lang/rust/pull/78077
2620 [77997]: https://github.com/rust-lang/rust/pull/77997
2621 [77703]: https://github.com/rust-lang/rust/pull/77703
2622 [77547]: https://github.com/rust-lang/rust/pull/77547
2623 [77015]: https://github.com/rust-lang/rust/pull/77015
2624 [76199]: https://github.com/rust-lang/rust/pull/76199
2625 [76119]: https://github.com/rust-lang/rust/pull/76119
2626 [75914]: https://github.com/rust-lang/rust/pull/75914
2627 [79004]: https://github.com/rust-lang/rust/pull/79004
2628 [78676]: https://github.com/rust-lang/rust/pull/78676
2629 [79904]: https://github.com/rust-lang/rust/issues/79904
2630 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2631 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2632 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2633 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2634 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2635 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2636 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2637 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2638 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2639 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2641 Version 1.48.0 (2020-11-19)
2642 ==========================
2647 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2648 is still rejected *semantically*, but can now be parsed by procedural macros.
2652 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2653 `rustc` whether to link its own C runtime and libraries or to rely on a external
2654 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2655 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2656 Note: If you're using cargo you must explicitly pass the `--target` flag.
2657 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2659 \* Refer to Rust's [platform support page][platform-support-doc] for more
2660 information on Rust's tiered platform support.
2664 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2665 and `&Stderr`.][76275]
2666 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2667 - [The `matches!` macro now supports having a trailing comma.][74880]
2668 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2669 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2673 - [`slice::as_ptr_range`]
2674 - [`slice::as_mut_ptr_range`]
2675 - [`VecDeque::make_contiguous`]
2676 - [`future::pending`]
2679 The following previously stable methods are now `const fn`'s:
2681 - [`Option::is_some`]
2682 - [`Option::is_none`]
2683 - [`Option::as_ref`]
2685 - [`Result::is_err`]
2686 - [`Result::as_ref`]
2687 - [`Ordering::reverse`]
2688 - [`Ordering::then`]
2695 - [You can now link to items in `rustdoc` using the intra-doc link
2696 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2697 a link to `std::future`'s documentation. See ["Linking to items by
2698 name"][intradoc-links] for more information.
2699 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2700 when searching through `rustdoc`'s UI.][75740]
2704 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2705 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2706 promoted to `'static` lifetime any more inside `const fn`s.
2707 - [Associated type bindings on trait objects are now verified to meet the bounds
2708 declared on the trait when checking that they implement the trait.][27675]
2709 - [When trait bounds on associated types or opaque types are ambiguous, the
2710 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2711 - [Fixed recursive nonterminals not being expanded in macros during
2712 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2713 correctly handling recursive nonterminal tokens.
2714 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2715 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2716 in places where they have no effect.][73461]
2717 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2718 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2719 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2720 disallow zero-initialization.][71274]
2721 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2722 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2723 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2724 see the [`catch_unwind`] documentation for further information.
2730 These changes provide no direct user facing benefits, but represent significant
2731 improvements to the internals and overall performance of rustc and
2734 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2735 You can continue building with `make` by setting `ninja=false` in
2737 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2738 - [Made `ensure_sufficient_stack()` non-generic][76680]
2740 [78143]: https://github.com/rust-lang/rust/issues/78143
2741 [76680]: https://github.com/rust-lang/rust/pull/76680/
2742 [76030]: https://github.com/rust-lang/rust/pull/76030/
2743 [70212]: https://github.com/rust-lang/rust/pull/70212/
2744 [27675]: https://github.com/rust-lang/rust/issues/27675/
2745 [54121]: https://github.com/rust-lang/rust/issues/54121/
2746 [71274]: https://github.com/rust-lang/rust/pull/71274/
2747 [77386]: https://github.com/rust-lang/rust/pull/77386/
2748 [77153]: https://github.com/rust-lang/rust/pull/77153/
2749 [77055]: https://github.com/rust-lang/rust/pull/77055/
2750 [76275]: https://github.com/rust-lang/rust/pull/76275/
2751 [76310]: https://github.com/rust-lang/rust/pull/76310/
2752 [76420]: https://github.com/rust-lang/rust/pull/76420/
2753 [76158]: https://github.com/rust-lang/rust/pull/76158/
2754 [75857]: https://github.com/rust-lang/rust/pull/75857/
2755 [75585]: https://github.com/rust-lang/rust/pull/75585/
2756 [75740]: https://github.com/rust-lang/rust/pull/75740/
2757 [75502]: https://github.com/rust-lang/rust/pull/75502/
2758 [74880]: https://github.com/rust-lang/rust/pull/74880/
2759 [74922]: https://github.com/rust-lang/rust/pull/74922/
2760 [74430]: https://github.com/rust-lang/rust/pull/74430/
2761 [74194]: https://github.com/rust-lang/rust/pull/74194/
2762 [73461]: https://github.com/rust-lang/rust/pull/73461/
2763 [73166]: https://github.com/rust-lang/rust/pull/73166/
2764 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2765 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2766 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2767 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2768 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2769 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2770 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2771 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2772 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2773 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2774 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2775 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2776 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2777 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2778 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2781 Version 1.47.0 (2020-10-08)
2782 ==========================
2786 - [Closures will now warn when not used.][74869]
2790 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2791 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2793 - [Upgraded to LLVM 11.][73526]
2794 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2795 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2796 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2798 \* Refer to Rust's [platform support page][platform-support-doc] for more
2799 information on Rust's tiered platform support.
2803 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2804 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2805 those of length less than 33.][74060]
2806 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2807 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2808 `PartialEq`, and `PartialOrd`.][73583]
2812 - [`Ident::new_raw`]
2813 - [`Range::is_empty`]
2814 - [`RangeInclusive::is_empty`]
2815 - [`Result::as_deref`]
2816 - [`Result::as_deref_mut`]
2818 - [`pointer::offset_from`]
2822 The following previously stable APIs have now been made const.
2824 - [The `new` method for all `NonZero` integers.][73858]
2825 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2826 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2827 methods for all integers.][73858]
2828 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2829 signed integers.][73858]
2830 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2831 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2832 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2833 `is_ascii_control` methods for `char` and `u8`.][73858]
2837 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2838 You can override this by setting the following in your `Cargo.toml`.
2840 [profile.release.build-override]
2843 - [`cargo-help` will now display man pages for commands rather just the
2844 `--help` text.][cargo/8456]
2845 - [`cargo-metadata` now emits a `test` field indicating if a target has
2846 tests enabled.][cargo/8478]
2847 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2848 - [`cargo-publish` will now use an alternative registry by default if it's the
2849 only registry specified in `package.publish`.][cargo/8571]
2853 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2854 type based search.][75366]
2855 - [Added the Ayu theme to rustdoc.][71237]
2859 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2860 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2861 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2862 help to preserve more span information.][73084] These changes may cause
2863 compilation errors if your macro was unhygenic or didn't correctly handle
2865 - [Moved support for the CloudABI target to tier 3.][75568]
2866 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2867 - [Added the `rustc-docs` component.][75560] This allows you to install
2868 and read the documentation for the compiler internal APIs. (Currently only
2869 available for `x86_64-unknown-linux-gnu`.)
2874 - [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.
2876 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2877 [75048]: https://github.com/rust-lang/rust/pull/75048/
2878 [74163]: https://github.com/rust-lang/rust/pull/74163/
2879 [71237]: https://github.com/rust-lang/rust/pull/71237/
2880 [74869]: https://github.com/rust-lang/rust/pull/74869/
2881 [73858]: https://github.com/rust-lang/rust/pull/73858/
2882 [75716]: https://github.com/rust-lang/rust/pull/75716/
2883 [75560]: https://github.com/rust-lang/rust/pull/75560/
2884 [75568]: https://github.com/rust-lang/rust/pull/75568/
2885 [75366]: https://github.com/rust-lang/rust/pull/75366/
2886 [75204]: https://github.com/rust-lang/rust/pull/75204/
2887 [74650]: https://github.com/rust-lang/rust/pull/74650/
2888 [74419]: https://github.com/rust-lang/rust/pull/74419/
2889 [73964]: https://github.com/rust-lang/rust/pull/73964/
2890 [74021]: https://github.com/rust-lang/rust/pull/74021/
2891 [74060]: https://github.com/rust-lang/rust/pull/74060/
2892 [73893]: https://github.com/rust-lang/rust/pull/73893/
2893 [73526]: https://github.com/rust-lang/rust/pull/73526/
2894 [73583]: https://github.com/rust-lang/rust/pull/73583/
2895 [73084]: https://github.com/rust-lang/rust/pull/73084/
2896 [73197]: https://github.com/rust-lang/rust/pull/73197/
2897 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2898 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2899 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2900 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2901 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2902 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2903 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2904 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2905 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2906 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2907 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2908 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2909 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2910 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2913 Version 1.46.0 (2020-08-27)
2914 ==========================
2918 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2919 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2920 const functions.][73862]
2921 - [The `#[track_caller]` attribute can now be added to functions to use the
2922 function's caller's location information for panic messages.][72445]
2923 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2924 `x.0.0` over `(x.0).0`.
2925 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2926 You currently can't use `mem::transmute` in constant functions.
2930 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2931 - [Enabled static "Position Independent Executables" by default
2932 for `x86_64-unknown-linux-musl`.][70740]
2936 - [`mem::forget` is now a `const fn`.][73887]
2937 - [`String` now implements `From<char>`.][73466]
2938 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2939 integer types.][73032]
2940 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2941 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2942 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2943 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2944 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2945 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2950 - [`vec::Drain::as_slice`]
2954 Added a number of new environment variables that are now available when
2955 compiling your crate.
2957 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2958 the specific binary being compiled and the name of the crate.
2959 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2960 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2964 - [The target configuration option `abi_blacklist` has been renamed
2965 to `unsupported_abis`.][74150] The old name will still continue to work.
2966 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2967 This was previously accepted but will become a hard error in a future release.
2968 - [Rustc will fail to compile if you have a struct with
2969 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2971 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2972 ensure that spans have the correct information, and may cause breakage if you
2973 were relying on receiving spans with dummy information.
2974 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2975 a legacy installer that was replaced by a MSI installer a few years ago but
2976 was still being built.
2977 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2978 - [Rustc will no longer accept overlapping trait implementations that only
2979 differ in how the lifetime was bound.][72493]
2980 - [Rustc now correctly relates the lifetime of an existential associated
2981 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2982 you to pass a shorter lifetime than expected.
2983 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2984 The library will need to be installed for `rustc` to work, even though we
2985 expect it to be already available on most systems.
2986 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2988 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2989 exact output returned by rustc's pretty printing is an unstable
2990 implementation detail: we recommend any macro relying on it to switch to a
2991 more robust parsing system.
2993 [75453]: https://github.com/rust-lang/rust/issues/75453/
2994 [74820]: https://github.com/rust-lang/rust/issues/74820/
2995 [74420]: https://github.com/rust-lang/rust/issues/74420/
2996 [74109]: https://github.com/rust-lang/rust/pull/74109/
2997 [74150]: https://github.com/rust-lang/rust/pull/74150/
2998 [73862]: https://github.com/rust-lang/rust/pull/73862/
2999 [73887]: https://github.com/rust-lang/rust/pull/73887/
3000 [73466]: https://github.com/rust-lang/rust/pull/73466/
3001 [73516]: https://github.com/rust-lang/rust/pull/73516/
3002 [73293]: https://github.com/rust-lang/rust/pull/73293/
3003 [73007]: https://github.com/rust-lang/rust/pull/73007/
3004 [73032]: https://github.com/rust-lang/rust/pull/73032/
3005 [72920]: https://github.com/rust-lang/rust/pull/72920/
3006 [72569]: https://github.com/rust-lang/rust/pull/72569/
3007 [72583]: https://github.com/rust-lang/rust/pull/72583/
3008 [72584]: https://github.com/rust-lang/rust/pull/72584/
3009 [72717]: https://github.com/rust-lang/rust/pull/72717/
3010 [72437]: https://github.com/rust-lang/rust/pull/72437/
3011 [72445]: https://github.com/rust-lang/rust/pull/72445/
3012 [72486]: https://github.com/rust-lang/rust/pull/72486/
3013 [72493]: https://github.com/rust-lang/rust/pull/72493/
3014 [72331]: https://github.com/rust-lang/rust/pull/72331/
3015 [71896]: https://github.com/rust-lang/rust/pull/71896/
3016 [71660]: https://github.com/rust-lang/rust/pull/71660/
3017 [71322]: https://github.com/rust-lang/rust/pull/71322/
3018 [70740]: https://github.com/rust-lang/rust/pull/70740/
3019 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
3020 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
3021 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
3022 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
3023 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
3026 Version 1.45.2 (2020-08-03)
3027 ==========================
3029 * [Fix bindings in tuple struct patterns][74954]
3030 * [Fix track_caller integration with trait objects][74784]
3032 [74954]: https://github.com/rust-lang/rust/issues/74954
3033 [74784]: https://github.com/rust-lang/rust/issues/74784
3036 Version 1.45.1 (2020-07-30)
3037 ==========================
3039 * [Fix const propagation with references.][73613]
3040 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3041 * [Avoid spurious implicit region bound.][74509]
3042 * [Install clippy on x.py install][74457]
3044 [73613]: https://github.com/rust-lang/rust/pull/73613
3045 [73078]: https://github.com/rust-lang/rust/issues/73078
3046 [74509]: https://github.com/rust-lang/rust/pull/74509
3047 [74457]: https://github.com/rust-lang/rust/pull/74457
3050 Version 1.45.0 (2020-07-16)
3051 ==========================
3055 - [Out of range float to int conversions using `as` has been defined as a saturating
3056 conversion.][71269] This was previously undefined behaviour, but you can use the
3057 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
3058 may be desirable in rare performance sensitive situations.
3059 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
3060 using `u64`.][70705]
3061 - [Function like procedural macros can now be used in expression, pattern, and statement
3062 positions.][68717] This means you can now use a function-like procedural macro
3063 anywhere you can use a declarative (`macro_rules!`) macro.
3067 - [You can now override individual target features through the `target-feature`
3068 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
3069 equivalent to `-C target-feature=+avx2,+fma`.
3070 - [Added the `force-unwind-tables` flag.][69984] This option allows
3071 rustc to always generate unwind tables regardless of panic strategy.
3072 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
3073 to include LLVM bitcode into generated `rlib`s (this is on by default).
3074 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
3075 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
3076 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
3077 - [Upgraded to LLVM 10.][67759]
3079 \* Refer to Rust's [platform support page][platform-support-doc] for more
3080 information on Rust's tiered platform support.
3085 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
3087 - [`proc_macro::TokenStream` now implements `Default`.][72234]
3088 - [You can now use `char` with
3089 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
3090 a range of codepoints.][72413] E.g.
3091 you can now write the following;
3093 for ch in 'a'..='z' {
3097 // Prints "abcdefghijklmnopqrstuvwxyz"
3099 - [`OsString` now implements `FromStr`.][71662]
3100 - [The `saturating_neg` method has been added to all signed integer primitive
3101 types, and the `saturating_abs` method has been added for all integer
3102 primitive types.][71886]
3103 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
3104 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
3106 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
3107 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
3108 integer types.][69813]
3109 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
3110 integer types.][72324]
3111 - [The `fetch_update` method has been added to all atomic integer types.][71843]
3116 - [`BTreeMap::remove_entry`]
3118 - [`rc::Weak::as_ptr`]
3119 - [`rc::Weak::from_raw`]
3120 - [`rc::Weak::into_raw`]
3121 - [`str::strip_prefix`]
3122 - [`str::strip_suffix`]
3123 - [`sync::Weak::as_ptr`]
3124 - [`sync::Weak::from_raw`]
3125 - [`sync::Weak::into_raw`]
3126 - [`char::UNICODE_VERSION`]
3127 - [`Span::resolved_at`]
3128 - [`Span::located_at`]
3129 - [`Span::mixed_site`]
3130 - [`unix::process::CommandExt::arg0`]
3135 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
3140 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
3141 `~~outdated information~~` becomes "~~outdated information~~".
3142 - [Added an emoji to Rustdoc's deprecated API message.][72014]
3146 - [Trying to self initialize a static value (that is creating a value using
3147 itself) is unsound and now causes a compile error.][71140]
3148 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
3149 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
3150 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
3151 previously undocumented and not intended for public use. Rustdoc still provides
3152 a non-zero exit code on errors.
3153 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
3154 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
3155 flags while cargo is adding `embed-bitcode` itself. The recommended way to
3156 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
3157 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
3161 - [Make clippy a git subtree instead of a git submodule][70655]
3162 - [Unify the undo log of all snapshot types][69464]
3164 [71848]: https://github.com/rust-lang/rust/issues/71848/
3165 [73420]: https://github.com/rust-lang/rust/issues/73420/
3166 [72324]: https://github.com/rust-lang/rust/pull/72324/
3167 [71843]: https://github.com/rust-lang/rust/pull/71843/
3168 [71886]: https://github.com/rust-lang/rust/pull/71886/
3169 [72234]: https://github.com/rust-lang/rust/pull/72234/
3170 [72239]: https://github.com/rust-lang/rust/pull/72239/
3171 [72397]: https://github.com/rust-lang/rust/pull/72397/
3172 [72413]: https://github.com/rust-lang/rust/pull/72413/
3173 [72014]: https://github.com/rust-lang/rust/pull/72014/
3174 [72062]: https://github.com/rust-lang/rust/pull/72062/
3175 [72094]: https://github.com/rust-lang/rust/pull/72094/
3176 [72133]: https://github.com/rust-lang/rust/pull/72133/
3177 [67759]: https://github.com/rust-lang/rust/pull/67759/
3178 [71900]: https://github.com/rust-lang/rust/pull/71900/
3179 [71928]: https://github.com/rust-lang/rust/pull/71928/
3180 [71662]: https://github.com/rust-lang/rust/pull/71662/
3181 [71716]: https://github.com/rust-lang/rust/pull/71716/
3182 [71447]: https://github.com/rust-lang/rust/pull/71447/
3183 [71269]: https://github.com/rust-lang/rust/pull/71269/
3184 [71095]: https://github.com/rust-lang/rust/pull/71095/
3185 [71140]: https://github.com/rust-lang/rust/pull/71140/
3186 [70655]: https://github.com/rust-lang/rust/pull/70655/
3187 [70705]: https://github.com/rust-lang/rust/pull/70705/
3188 [69984]: https://github.com/rust-lang/rust/pull/69984/
3189 [69813]: https://github.com/rust-lang/rust/pull/69813/
3190 [69464]: https://github.com/rust-lang/rust/pull/69464/
3191 [68717]: https://github.com/rust-lang/rust/pull/68717/
3192 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
3193 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
3194 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
3195 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
3196 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
3197 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
3198 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
3199 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
3200 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
3201 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
3202 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
3203 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
3204 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
3205 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
3206 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
3207 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
3208 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
3211 Version 1.44.1 (2020-06-18)
3212 ===========================
3214 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
3215 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
3216 * [Fix crashes when finding backtrace on macOS.][71397]
3217 * [Clippy applies lint levels into different files.][clippy/5356]
3219 [71397]: https://github.com/rust-lang/rust/issues/71397
3220 [73078]: https://github.com/rust-lang/rust/issues/73078
3221 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
3222 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
3225 Version 1.44.0 (2020-06-04)
3226 ==========================
3230 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
3231 - [Added the `unused_braces` lint.][70081]
3233 **Syntax-only changes**
3235 - [Expansion-driven outline module parsing][69838]
3240 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
3245 These are still rejected semantically, so you will likely receive an error but
3246 these changes can be seen and parsed by macros and conditional compilation.
3250 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
3251 Additionally when in incremental mode rustc defaults to 256 codegen units.
3252 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
3253 a panic is thrown.][67502]
3254 - [Added tier 3\* support for the `aarch64-unknown-none` and
3255 `aarch64-unknown-none-softfloat` targets.][68334]
3256 - [Added tier 3 support for `arm64-apple-tvos` and
3257 `x86_64-apple-tvos` targets.][68191]
3262 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
3263 `vec![]` to be able to be used in `const` contexts.
3264 - [`convert::Infallible` now implements `Hash`.][70281]
3265 - [`OsString` now implements `DerefMut` and `IndexMut` returning
3266 a `&mut OsStr`.][70048]
3267 - [Unicode 13 is now supported.][69929]
3268 - [`String` now implements `From<&mut str>`.][69661]
3269 - [`IoSlice` now implements `Copy`.][69403]
3270 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
3271 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
3272 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
3273 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
3274 integer types.][69373]
3278 - [`PathBuf::with_capacity`]
3279 - [`PathBuf::capacity`]
3280 - [`PathBuf::clear`]
3281 - [`PathBuf::reserve`]
3282 - [`PathBuf::reserve_exact`]
3283 - [`PathBuf::shrink_to_fit`]
3284 - [`f32::to_int_unchecked`]
3285 - [`f64::to_int_unchecked`]
3286 - [`Layout::align_to`]
3287 - [`Layout::pad_to_align`]
3289 - [`Layout::extend`]
3293 - [Added the `cargo tree` command which will print a tree graph of
3294 your dependencies.][cargo/8062] E.g.
3296 mdbook v0.3.2 (/Users/src/rust/mdbook)
3298 │ ├── html5ever v0.24.0
3300 │ │ │ └── cfg-if v0.1.9
3302 │ │ └── markup5ever v0.9.0
3303 │ │ ├── log v0.4.8 (*)
3305 │ │ │ └── phf_shared v0.7.24
3306 │ │ │ ├── siphasher v0.2.3
3307 │ │ │ └── unicase v1.4.2
3308 │ │ │ [build-dependencies]
3309 │ │ │ └── version_check v0.1.5
3312 You can also display dependencies on multiple versions of the same crate with
3313 `cargo tree -d` (short for `cargo tree --duplicates`).
3317 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
3318 the version in the sidebar.][69494]
3322 - [Rustc now correctly generates static libraries on Windows GNU targets with
3323 the `.a` extension, rather than the previous `.lib`.][70937]
3324 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
3325 - [The `file_name` property in JSON output of macro errors now points the actual
3326 source file rather than the previous format of `<NAME macros>`.][70969]
3327 **Note:** this may not point to a file that actually exists on the user's system.
3328 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
3329 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
3330 not allow zero initialization such as `NonZeroU8`.][66059] This was
3331 previously a warning.
3332 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
3333 operator has been defined as a saturating operation.][71269] This was previously
3334 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
3335 continue using the current behaviour, which may be desirable in rare performance
3336 sensitive situations.
3340 These changes provide no direct user facing benefits, but represent significant
3341 improvements to the internals and overall performance of rustc and
3344 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3345 - [Replace big JS dict with JSON parsing.][71250]
3347 [69373]: https://github.com/rust-lang/rust/pull/69373/
3348 [66059]: https://github.com/rust-lang/rust/pull/66059/
3349 [68191]: https://github.com/rust-lang/rust/pull/68191/
3350 [68899]: https://github.com/rust-lang/rust/pull/68899/
3351 [71147]: https://github.com/rust-lang/rust/pull/71147/
3352 [71250]: https://github.com/rust-lang/rust/pull/71250/
3353 [70937]: https://github.com/rust-lang/rust/pull/70937/
3354 [70969]: https://github.com/rust-lang/rust/pull/70969/
3355 [70632]: https://github.com/rust-lang/rust/pull/70632/
3356 [70281]: https://github.com/rust-lang/rust/pull/70281/
3357 [70345]: https://github.com/rust-lang/rust/pull/70345/
3358 [70048]: https://github.com/rust-lang/rust/pull/70048/
3359 [70081]: https://github.com/rust-lang/rust/pull/70081/
3360 [70156]: https://github.com/rust-lang/rust/pull/70156/
3361 [71269]: https://github.com/rust-lang/rust/pull/71269/
3362 [69838]: https://github.com/rust-lang/rust/pull/69838/
3363 [69929]: https://github.com/rust-lang/rust/pull/69929/
3364 [69661]: https://github.com/rust-lang/rust/pull/69661/
3365 [69778]: https://github.com/rust-lang/rust/pull/69778/
3366 [69494]: https://github.com/rust-lang/rust/pull/69494/
3367 [69403]: https://github.com/rust-lang/rust/pull/69403/
3368 [69033]: https://github.com/rust-lang/rust/pull/69033/
3369 [68692]: https://github.com/rust-lang/rust/pull/68692/
3370 [68334]: https://github.com/rust-lang/rust/pull/68334/
3371 [67502]: https://github.com/rust-lang/rust/pull/67502/
3372 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3373 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3374 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3375 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3376 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3377 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3378 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3379 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3380 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3381 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3382 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3383 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3384 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3387 Version 1.43.1 (2020-05-07)
3388 ===========================
3390 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3391 * [Fixed the stabilization of AVX-512 features.][71473]
3392 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3394 [71430]: https://github.com/rust-lang/rust/pull/71430
3395 [71473]: https://github.com/rust-lang/rust/issues/71473
3396 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3399 Version 1.43.0 (2020-04-23)
3400 ==========================
3404 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3405 the type inferred correctly.][68129]
3406 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3408 **Syntax only changes**
3409 - [Allow `type Foo: Ord` syntactically.][69361]
3410 - [Fuse associated and extern items up to defaultness.][69194]
3411 - [Syntactically allow `self` in all `fn` contexts.][68764]
3412 - [Merge `fn` syntax + cleanup item parsing.][68728]
3413 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3414 For example, you may now write:
3416 macro_rules! mac_trait {
3426 These are still rejected *semantically*, so you will likely receive an error but
3427 these changes can be seen and parsed by macros and
3428 conditional compilation.
3433 - [You can now pass multiple lint flags to rustc to override the previous
3434 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3435 everything in the `unused` lint group except `unused-variables` which
3436 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3437 everything in the `unused` lint group **including** `unused-variables` since
3438 the allow flag is specified before the deny flag (and therefore overridden).
3439 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3440 if they are available on `windows-gnu`.][67429]
3441 - [rustc now buffers errors/warnings printed in JSON.][69227]
3445 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3446 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3447 respectively.][69538] **Note** These conversions are only available when `N`
3449 - [You can now use associated constants on floats and integers directly, rather
3450 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3451 `f32::NAN` with no imports.
3452 - [`u8::is_ascii` is now `const`.][68984]
3453 - [`String` now implements `AsMut<str>`.][68742]
3454 - [Added the `primitive` module to `std` and `core`.][67637] This module
3455 reexports Rust's primitive types. This is mainly useful in macros
3456 where you want avoid these types being shadowed.
3457 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3458 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3462 - [`Once::is_completed`]
3467 - [`iter::once_with`]
3471 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3472 your environment.][cargo/7823]
3473 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3474 executable path when running integration tests or benchmarks.][cargo/7697]
3475 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3476 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3480 - [Certain checks in the `const_err` lint were deemed unrelated to const
3481 evaluation][69185], and have been moved to the `unconditional_panic` and
3482 `arithmetic_overflow` lints.
3487 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3488 has been a warning since 1.36.0.
3489 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3490 led to some instances being accepted, and now correctly emits a hard error.
3492 [69340]: https://github.com/rust-lang/rust/pull/69340
3496 These changes provide no direct user facing benefits, but represent significant
3497 improvements to the internals and overall performance of `rustc` and
3500 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3501 - [Improved how rustc generates drop code.][67332]
3502 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3503 - [traits: preallocate 2 Vecs of known initial size][69022]
3504 - [Avoid exponential behaviour when relating types][68772]
3505 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3506 - [Improve performance of coherence checks][68966]
3507 - [Deduplicate types in the generator witness][68672]
3508 - [Invert control in struct_lint_level.][68725]
3510 [67332]: https://github.com/rust-lang/rust/pull/67332/
3511 [67429]: https://github.com/rust-lang/rust/pull/67429/
3512 [67637]: https://github.com/rust-lang/rust/pull/67637/
3513 [67642]: https://github.com/rust-lang/rust/pull/67642/
3514 [67878]: https://github.com/rust-lang/rust/pull/67878/
3515 [67885]: https://github.com/rust-lang/rust/pull/67885/
3516 [68129]: https://github.com/rust-lang/rust/pull/68129/
3517 [68672]: https://github.com/rust-lang/rust/pull/68672/
3518 [68725]: https://github.com/rust-lang/rust/pull/68725/
3519 [68728]: https://github.com/rust-lang/rust/pull/68728/
3520 [68738]: https://github.com/rust-lang/rust/pull/68738/
3521 [68742]: https://github.com/rust-lang/rust/pull/68742/
3522 [68764]: https://github.com/rust-lang/rust/pull/68764/
3523 [68772]: https://github.com/rust-lang/rust/pull/68772/
3524 [68943]: https://github.com/rust-lang/rust/pull/68943/
3525 [68952]: https://github.com/rust-lang/rust/pull/68952/
3526 [68966]: https://github.com/rust-lang/rust/pull/68966/
3527 [68984]: https://github.com/rust-lang/rust/pull/68984/
3528 [69022]: https://github.com/rust-lang/rust/pull/69022/
3529 [69185]: https://github.com/rust-lang/rust/pull/69185/
3530 [69194]: https://github.com/rust-lang/rust/pull/69194/
3531 [69201]: https://github.com/rust-lang/rust/pull/69201/
3532 [69227]: https://github.com/rust-lang/rust/pull/69227/
3533 [69548]: https://github.com/rust-lang/rust/pull/69548/
3534 [69256]: https://github.com/rust-lang/rust/pull/69256/
3535 [69361]: https://github.com/rust-lang/rust/pull/69361/
3536 [69366]: https://github.com/rust-lang/rust/pull/69366/
3537 [69538]: https://github.com/rust-lang/rust/pull/69538/
3538 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3539 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3540 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3541 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3542 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3543 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3544 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3545 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3548 Version 1.42.0 (2020-03-12)
3549 ==========================
3553 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3555 fn foo(words: &[&str]) {
3557 ["Hello", "World", "!", ..] => println!("Hello World!"),
3558 ["Foo", "Bar", ..] => println!("Baz"),
3559 rest => println!("{:?}", rest),
3563 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3564 that you can create an enum that has the exact layout and ABI of the type
3566 - [You can now use outer attribute procedural macros on inline modules.][64273]
3567 - [There are some *syntax-only* changes:][67131]
3568 - `default` is syntactically allowed before items in `trait` definitions.
3569 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3570 leave out their bodies in favor of `;`.
3571 - Bounds on associated types in `impl`s are now syntactically allowed
3572 (e.g. `type Foo: Ord;`).
3573 - `...` (the C-variadic type) may occur syntactically directly as the type of
3574 any function parameter.
3576 These are still rejected *semantically*, so you will likely receive an error
3577 but these changes can be seen and parsed by procedural macros and
3578 conditional compilation.
3582 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3583 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3584 - [`Option::{expect,unwrap}` and
3585 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3586 pointing to the location where they were called, rather than
3587 `core`'s internals. ][67887]
3589 \* Refer to Rust's [platform support page][platform-support-doc] for more
3590 information on Rust's tiered platform support.
3594 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3595 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3596 to implement `Sized`.][67935]
3597 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3598 - [`Layout::new` is now `const`.][66254]
3599 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3604 - [`CondVar::wait_while`]
3605 - [`CondVar::wait_timeout_while`]
3607 - [`DebugMap::value`]
3608 - [`ManuallyDrop::take`]
3610 - [`ptr::slice_from_raw_parts_mut`]
3611 - [`ptr::slice_from_raw_parts`]
3615 - [You no longer need to include `extern crate proc_macro;` to be able to
3616 `use proc_macro;` in the `2018` edition.][cargo/7700]
3620 - [`Error::description` has been deprecated, and its use will now produce a
3621 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3623 [68253]: https://github.com/rust-lang/rust/pull/68253/
3624 [68348]: https://github.com/rust-lang/rust/pull/68348/
3625 [67935]: https://github.com/rust-lang/rust/pull/67935/
3626 [68339]: https://github.com/rust-lang/rust/pull/68339/
3627 [68122]: https://github.com/rust-lang/rust/pull/68122/
3628 [64273]: https://github.com/rust-lang/rust/pull/64273/
3629 [67712]: https://github.com/rust-lang/rust/pull/67712/
3630 [67887]: https://github.com/rust-lang/rust/pull/67887/
3631 [67131]: https://github.com/rust-lang/rust/pull/67131/
3632 [67233]: https://github.com/rust-lang/rust/pull/67233/
3633 [66899]: https://github.com/rust-lang/rust/pull/66899/
3634 [66919]: https://github.com/rust-lang/rust/pull/66919/
3635 [66254]: https://github.com/rust-lang/rust/pull/66254/
3636 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3637 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3638 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3639 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3640 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3641 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3642 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3643 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3644 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3647 Version 1.41.1 (2020-02-27)
3648 ===========================
3650 * [Always check types of static items][69145]
3651 * [Always check lifetime bounds of `Copy` impls][69145]
3652 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3654 [69225]: https://github.com/rust-lang/rust/issues/69225
3655 [69145]: https://github.com/rust-lang/rust/pull/69145
3658 Version 1.41.0 (2020-01-30)
3659 ===========================
3664 - [You can now pass type parameters to foreign items when implementing
3665 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3666 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3667 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3668 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3669 - [You can now use any valid identifier in a `format_args` macro.][66847]
3670 Previously identifiers starting with an underscore were not allowed.
3671 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3672 enum variants.][66183] These are still rejected semantically, but
3673 can be seen and parsed by procedural macros and conditional compilation.
3674 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3675 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3676 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3678 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3683 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3684 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3685 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3686 - [You can now pass an arguments file passing the `@path` syntax
3687 to rustc.][66172] Note that the format differs somewhat from what is
3688 found in other tooling; please see [the documentation][argfile-docs] for
3690 - [You can now provide `--extern` flag without a path, indicating that it is
3691 available from the search path or specified with an `-L` flag.][64882]
3693 \* Refer to Rust's [platform support page][platform-support-doc] for more
3694 information on Rust's tiered platform support.
3696 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3701 - [The `core::panic` module is now stable.][66771] It was already stable
3703 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3704 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3705 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3710 - [`Result::map_or`]
3711 - [`Result::map_or_else`]
3712 - [`std::rc::Weak::weak_count`]
3713 - [`std::rc::Weak::strong_count`]
3714 - [`std::sync::Weak::weak_count`]
3715 - [`std::sync::Weak::strong_count`]
3720 - [Cargo will now document all the private items for binary crates
3721 by default.][cargo/7593]
3722 - [`cargo-install` will now reinstall the package if it detects that it is out
3723 of date.][cargo/7560]
3724 - [Cargo.lock now uses a more git friendly format that should help to reduce
3725 merge conflicts.][cargo/7579]
3726 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3727 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3728 optimisation level to `2` for debug builds. You can also use
3729 `[profile.<profile>.build-override]` to override build scripts and
3735 - [You can now specify `edition` in documentation code blocks to compile the block
3736 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3737 should be compiled the 2018 edition of Rust.
3738 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3739 current theme with `--check-theme`.][54733]
3740 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3745 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3746 Apple targets.][apple-32bit-drop] This means that the source code is still
3747 available to build, but the targets are no longer being tested and release
3748 binaries for those platforms will no longer be distributed by the Rust project.
3749 Please refer to the linked blog post for more information.
3751 [54733]: https://github.com/rust-lang/rust/pull/54733/
3752 [61351]: https://github.com/rust-lang/rust/pull/61351/
3753 [62514]: https://github.com/rust-lang/rust/pull/62514/
3754 [67255]: https://github.com/rust-lang/rust/pull/67255/
3755 [66661]: https://github.com/rust-lang/rust/pull/66661/
3756 [66771]: https://github.com/rust-lang/rust/pull/66771/
3757 [66847]: https://github.com/rust-lang/rust/pull/66847/
3758 [66238]: https://github.com/rust-lang/rust/pull/66238/
3759 [66277]: https://github.com/rust-lang/rust/pull/66277/
3760 [66325]: https://github.com/rust-lang/rust/pull/66325/
3761 [66172]: https://github.com/rust-lang/rust/pull/66172/
3762 [66183]: https://github.com/rust-lang/rust/pull/66183/
3763 [65879]: https://github.com/rust-lang/rust/pull/65879/
3764 [65013]: https://github.com/rust-lang/rust/pull/65013/
3765 [64882]: https://github.com/rust-lang/rust/pull/64882/
3766 [64325]: https://github.com/rust-lang/rust/pull/64325/
3767 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3768 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3769 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3770 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3771 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3772 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3773 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3774 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3775 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3776 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3777 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3779 Version 1.40.0 (2019-12-19)
3780 ===========================
3784 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3785 `const` contexts.][65188] e.g.
3788 pub struct Point(i32, i32);
3790 const ORIGIN: Point = {
3791 let constructor = Point;
3797 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3798 indicate that there may be variants or fields added in the future.][64639]
3799 For example this requires adding a wild-card branch (`_ => {}`) to any match
3800 statements on a non-exhaustive `enum`. [(RFC 2008)]
3801 - [You can now use function-like procedural macros in `extern` blocks and in
3802 type positions.][63931] e.g. `type Generated = macro!();`
3803 - [Function-like and attribute procedural macros can now emit
3804 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3805 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3806 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3807 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3811 - [Added tier 3 support\* for the
3812 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3813 - [Added tier 3 support for the
3814 `aarch64-unknown-none-softfloat` target.][64589]
3815 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3816 `mips64el-unknown-linux-muslabi64` targets.][65843]
3818 \* Refer to Rust's [platform support page][platform-support-doc] for more
3819 information on Rust's tiered platform support.
3823 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3827 - [`BTreeMap::get_key_value`]
3828 - [`HashMap::get_key_value`]
3829 - [`Option::as_deref_mut`]
3830 - [`Option::as_deref`]
3831 - [`Option::flatten`]
3832 - [`UdpSocket::peer_addr`]
3833 - [`f32::to_be_bytes`]
3834 - [`f32::to_le_bytes`]
3835 - [`f32::to_ne_bytes`]
3836 - [`f64::to_be_bytes`]
3837 - [`f64::to_le_bytes`]
3838 - [`f64::to_ne_bytes`]
3839 - [`f32::from_be_bytes`]
3840 - [`f32::from_le_bytes`]
3841 - [`f32::from_ne_bytes`]
3842 - [`f64::from_be_bytes`]
3843 - [`f64::from_le_bytes`]
3844 - [`f64::from_ne_bytes`]
3851 - [Cargo will now always display warnings, rather than only on
3852 fresh builds.][cargo/7450]
3853 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3854 now produce an error.][cargo/7507] Previously these flags were ignored.
3855 - [You can now publish `dev-dependencies` without including
3856 a `version`.][cargo/7333]
3860 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3861 when running documentation tests with `rustdoc`.][63803]
3865 - [As previously announced, any previous NLL warnings in the 2015 edition are
3866 now hard errors.][64221]
3867 - [The `include!` macro will now warn if it failed to include the
3868 entire file.][64284] The `include!` macro unintentionally only includes the
3869 first _expression_ in a file, and this can be unintuitive. This will become
3870 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3871 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3872 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3873 or `extern` blocks now correctly emits a hard error.
3875 [65294]: https://github.com/rust-lang/rust/pull/65294/
3876 [66103]: https://github.com/rust-lang/rust/pull/66103/
3877 [65843]: https://github.com/rust-lang/rust/pull/65843/
3878 [65188]: https://github.com/rust-lang/rust/pull/65188/
3879 [65092]: https://github.com/rust-lang/rust/pull/65092/
3880 [64589]: https://github.com/rust-lang/rust/pull/64589/
3881 [64639]: https://github.com/rust-lang/rust/pull/64639/
3882 [64221]: https://github.com/rust-lang/rust/pull/64221/
3883 [64284]: https://github.com/rust-lang/rust/pull/64284/
3884 [63931]: https://github.com/rust-lang/rust/pull/63931/
3885 [64035]: https://github.com/rust-lang/rust/pull/64035/
3886 [63674]: https://github.com/rust-lang/rust/pull/63674/
3887 [63803]: https://github.com/rust-lang/rust/pull/63803/
3888 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3889 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3890 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3891 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3892 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3893 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3894 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3895 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3896 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3897 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3898 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3899 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3900 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3901 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3902 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3903 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3904 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3905 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3906 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3907 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3908 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3909 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3910 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3911 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3912 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3915 Version 1.39.0 (2019-11-07)
3916 ===========================
3920 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3921 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3922 - [You can now use certain attributes on function, closure, and function pointer
3923 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3924 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3925 attributes applied to items. e.g.
3928 #[cfg(windows)] slice: &[u16],
3929 #[cfg(not(windows))] slice: &[u8],
3934 - [You can now take shared references to bind-by-move patterns in the `if` guards
3935 of `match` arms.][63118] e.g.
3938 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3942 // ---- `nums` is bound by move.
3943 if nums.iter().sum::<u8>() == 10
3944 // ^------ `.iter()` implicitly takes a reference to `nums`.
3947 // ----------- Legal as `nums` was bound by move and so we have ownership.
3949 _ => unreachable!(),
3958 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3959 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3960 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3961 **Note** Cargo currently doesn't use this feature. Refer to
3962 [cargo#7315][cargo/7315] to track this feature's progress.
3963 - [You can now pass `--show-output` argument to test binaries to print the
3964 output of successful tests.][62600]
3967 \* Refer to Rust's [platform support page][platform-support-doc] for more
3968 information on Rust's tiered platform support.
3972 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3973 - [`LinkedList::new` is now a `const` function.][63684]
3974 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3975 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3976 now `const`.][63786]
3980 - [`Pin::into_inner`]
3981 - [`Instant::checked_duration_since`]
3982 - [`Instant::saturating_duration_since`]
3986 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3987 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3988 `--all` is now deprecated.
3992 - [You can now pass `-Clinker` to rustdoc to control the linker used
3993 for compiling doctests.][63834]
3997 - [Code that was previously accepted by the old borrow checker, but rejected by
3998 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3999 previously a warning, and will also become a hard error in the Rust 2015
4000 edition in the 1.40.0 release.
4001 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
4002 run tests.][63827] This should improve performance when running a large
4004 - [The `try!` macro will now issue a deprecation warning.][62672] It is
4005 recommended to use the `?` operator instead.
4006 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
4009 [62600]: https://github.com/rust-lang/rust/pull/62600/
4010 [62672]: https://github.com/rust-lang/rust/pull/62672/
4011 [63118]: https://github.com/rust-lang/rust/pull/63118/
4012 [63209]: https://github.com/rust-lang/rust/pull/63209/
4013 [63402]: https://github.com/rust-lang/rust/pull/63402/
4014 [63565]: https://github.com/rust-lang/rust/pull/63565/
4015 [63595]: https://github.com/rust-lang/rust/pull/63595/
4016 [63684]: https://github.com/rust-lang/rust/pull/63684/
4017 [63698]: https://github.com/rust-lang/rust/pull/63698/
4018 [63770]: https://github.com/rust-lang/rust/pull/63770/
4019 [63786]: https://github.com/rust-lang/rust/pull/63786/
4020 [63827]: https://github.com/rust-lang/rust/pull/63827/
4021 [63834]: https://github.com/rust-lang/rust/pull/63834/
4022 [64010]: https://github.com/rust-lang/rust/pull/64010/
4023 [64028]: https://github.com/rust-lang/rust/pull/64028/
4024 [64334]: https://github.com/rust-lang/rust/pull/64334/
4025 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
4026 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
4027 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
4028 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
4029 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
4030 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
4032 Version 1.38.0 (2019-09-26)
4033 ==========================
4037 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
4038 - [The `#[deprecated]` attribute can now be used on macros.][62042]
4042 - [Added pipelined compilation support to `rustc`.][62766] This will
4043 improve compilation times in some cases. For further information please refer
4044 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
4045 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
4046 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
4047 `x86_64-uwp-windows-msvc` targets.][60260]
4048 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
4049 `armv7-unknown-linux-musleabi` targets.][63107]
4050 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
4051 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
4052 - [Upgraded to LLVM 9.][62592]
4054 \* Refer to Rust's [platform support page][platform-support-doc] for more
4055 information on Rust's tiered platform support.
4059 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
4060 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
4061 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
4062 is available at `std::clone::Clone`). This also makes all built-in macros
4063 available in `std`/`core` root. e.g. `std::include_bytes!`.
4064 - [`str::Chars` now implements `Debug`.][63000]
4065 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
4066 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
4067 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
4068 - [Added euclidean remainder and division operations (`div_euclid`,
4069 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
4070 `overflowing`, and `wrapping` versions are available for all
4072 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
4073 `PartialEq`.][61491]
4074 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
4078 - [`<*const T>::cast`]
4079 - [`<*mut T>::cast`]
4080 - [`Duration::as_secs_f32`]
4081 - [`Duration::as_secs_f64`]
4082 - [`Duration::div_f32`]
4083 - [`Duration::div_f64`]
4084 - [`Duration::from_secs_f32`]
4085 - [`Duration::from_secs_f64`]
4086 - [`Duration::mul_f32`]
4087 - [`Duration::mul_f64`]
4088 - [`any::type_name`]
4092 - [Added pipelined compilation support to `cargo`.][cargo/7143]
4093 - [You can now pass the `--features` option multiple times to enable
4094 multiple features.][cargo/7084]
4099 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
4103 - [`rustc` will now warn about some incorrect uses of
4104 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
4108 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
4110 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
4111 issues][62896] with certain crates such as libc.
4113 [60260]: https://github.com/rust-lang/rust/pull/60260/
4114 [61457]: https://github.com/rust-lang/rust/pull/61457/
4115 [61491]: https://github.com/rust-lang/rust/pull/61491/
4116 [61884]: https://github.com/rust-lang/rust/pull/61884/
4117 [61953]: https://github.com/rust-lang/rust/pull/61953/
4118 [62042]: https://github.com/rust-lang/rust/pull/62042/
4119 [62528]: https://github.com/rust-lang/rust/pull/62528/
4120 [62583]: https://github.com/rust-lang/rust/pull/62583/
4121 [62735]: https://github.com/rust-lang/rust/pull/62735/
4122 [62766]: https://github.com/rust-lang/rust/pull/62766/
4123 [62784]: https://github.com/rust-lang/rust/pull/62784/
4124 [62592]: https://github.com/rust-lang/rust/pull/62592/
4125 [62785]: https://github.com/rust-lang/rust/issues/62785/
4126 [62814]: https://github.com/rust-lang/rust/pull/62814/
4127 [62896]: https://github.com/rust-lang/rust/issues/62896/
4128 [63000]: https://github.com/rust-lang/rust/pull/63000/
4129 [63056]: https://github.com/rust-lang/rust/pull/63056/
4130 [63107]: https://github.com/rust-lang/rust/pull/63107/
4131 [63346]: https://github.com/rust-lang/rust/pull/63346/
4132 [63421]: https://github.com/rust-lang/rust/pull/63421/
4133 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
4134 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
4135 [63048]: https://github.com/rust-lang/rust/pull/63048
4136 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4137 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
4138 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
4139 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
4140 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
4141 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
4142 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
4143 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
4144 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
4145 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
4146 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
4147 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
4148 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
4150 Version 1.37.0 (2019-08-15)
4151 ==========================
4155 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
4156 [`Box`][62228], or an [array][62235] and unused.
4157 - [You can now use the `cfg` and `cfg_attr` attributes on
4158 generic parameters.][61547]
4159 - [You can now use enum variants through type alias.][61682] e.g. You can
4160 write the following:
4162 type MyOption = Option<u8>;
4164 fn increment_or_zero(x: MyOption) -> u8 {
4166 MyOption::Some(y) => y + 1,
4167 MyOption::None => 0,
4171 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
4172 `const _: u32 = 5;`.
4173 - [You can now use `#[repr(align(X)]` on enums.][61229]
4174 - [The `?` Kleene macro operator is now available in the
4175 2015 edition.][60932]
4179 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
4180 and `-C profile-use` flags.][61268] For more information on how to use profile
4181 guided optimization, please refer to the [rustc book][rustc-book-pgo].
4182 - [The `rust-lldb` wrapper script should now work again.][61827]
4186 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
4190 - [`BufReader::buffer`]
4191 - [`BufWriter::buffer`]
4192 - [`Cell::from_mut`]
4193 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
4194 - [`DoubleEndedIterator::nth_back`]
4196 - [`Wrapping::reverse_bits`]
4197 - [`i128::reverse_bits`]
4198 - [`i16::reverse_bits`]
4199 - [`i32::reverse_bits`]
4200 - [`i64::reverse_bits`]
4201 - [`i8::reverse_bits`]
4202 - [`isize::reverse_bits`]
4203 - [`slice::copy_within`]
4204 - [`u128::reverse_bits`]
4205 - [`u16::reverse_bits`]
4206 - [`u32::reverse_bits`]
4207 - [`u64::reverse_bits`]
4208 - [`u8::reverse_bits`]
4209 - [`usize::reverse_bits`]
4213 - [`Cargo.lock` files are now included by default when publishing executable crates
4214 with executables.][cargo/7026]
4215 - [You can now specify `default-run="foo"` in `[package]` to specify the
4216 default executable to use for `cargo run`.][cargo/7056]
4223 - [Using `...` for inclusive range patterns will now warn by default.][61342]
4224 Please transition your code to using the `..=` syntax for inclusive
4226 - [Using a trait object without the `dyn` will now warn by default.][61203]
4227 Please transition your code to use `dyn Trait` for trait objects instead.
4229 [62228]: https://github.com/rust-lang/rust/pull/62228/
4230 [62235]: https://github.com/rust-lang/rust/pull/62235/
4231 [61802]: https://github.com/rust-lang/rust/pull/61802/
4232 [61827]: https://github.com/rust-lang/rust/pull/61827/
4233 [61547]: https://github.com/rust-lang/rust/pull/61547/
4234 [61682]: https://github.com/rust-lang/rust/pull/61682/
4235 [61268]: https://github.com/rust-lang/rust/pull/61268/
4236 [61342]: https://github.com/rust-lang/rust/pull/61342/
4237 [61347]: https://github.com/rust-lang/rust/pull/61347/
4238 [61100]: https://github.com/rust-lang/rust/pull/61100/
4239 [61203]: https://github.com/rust-lang/rust/pull/61203/
4240 [61229]: https://github.com/rust-lang/rust/pull/61229/
4241 [60932]: https://github.com/rust-lang/rust/pull/60932/
4242 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
4243 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
4244 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
4245 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
4246 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
4247 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
4248 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
4249 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
4250 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
4251 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
4252 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
4253 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
4254 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
4255 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
4256 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
4257 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
4258 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
4259 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
4260 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
4261 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
4262 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
4263 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
4264 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
4267 Version 1.36.0 (2019-07-04)
4268 ==========================
4272 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
4273 - [The order of traits in trait objects no longer affects the semantics of that
4274 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
4275 `dyn fmt::Debug + Send`, where this was previously not the case.
4279 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
4280 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
4281 - [`mem::needs_drop` is now available as a const fn.][60364]
4282 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
4283 - [`String` now implements `BorrowMut<str>`.][60404]
4284 - [`io::Cursor` now implements `Default`.][60234]
4285 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
4286 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
4287 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
4288 environment has access to heap memory allocation.
4289 - [`String` now implements `From<&String>`.][59825]
4290 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
4291 return a tuple of each argument when there is multiple arguments.
4292 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
4297 - [`VecDeque::rotate_left`]
4298 - [`VecDeque::rotate_right`]
4299 - [`Iterator::copied`]
4301 - [`io::IoSliceMut`]
4302 - [`Read::read_vectored`]
4303 - [`Write::write_vectored`]
4304 - [`str::as_mut_ptr`]
4305 - [`mem::MaybeUninit`]
4306 - [`pointer::align_offset`]
4307 - [`future::Future`]
4309 - [`task::RawWaker`]
4310 - [`task::RawWakerVTable`]
4316 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
4317 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
4319 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
4323 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
4330 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
4331 longer recommended, and will be deprecated in 1.39.0.
4333 [60318]: https://github.com/rust-lang/rust/pull/60318/
4334 [60364]: https://github.com/rust-lang/rust/pull/60364/
4335 [60370]: https://github.com/rust-lang/rust/pull/60370/
4336 [60404]: https://github.com/rust-lang/rust/pull/60404/
4337 [60234]: https://github.com/rust-lang/rust/pull/60234/
4338 [60244]: https://github.com/rust-lang/rust/pull/60244/
4339 [58623]: https://github.com/rust-lang/rust/pull/58623/
4340 [59648]: https://github.com/rust-lang/rust/pull/59648/
4341 [59675]: https://github.com/rust-lang/rust/pull/59675/
4342 [59825]: https://github.com/rust-lang/rust/pull/59825/
4343 [59826]: https://github.com/rust-lang/rust/pull/59826/
4344 [59445]: https://github.com/rust-lang/rust/pull/59445/
4345 [59114]: https://github.com/rust-lang/rust/pull/59114/
4346 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4347 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4348 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4349 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4350 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4351 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4352 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4353 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4354 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4355 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4356 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4357 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4358 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4359 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4360 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4361 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4362 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4363 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4364 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4365 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4368 Version 1.35.0 (2019-05-23)
4369 ==========================
4373 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4374 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4375 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4377 unsafe fn call_unsafe(func: unsafe fn()) {
4382 unsafe { call_unsafe(|| {}); }
4389 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4390 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4391 - [Added the `wasm32-unknown-wasi` target.][59464]
4396 - [`Thread` will now show its ID in `Debug` output.][59460]
4397 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4398 - [`alloc::System` now implements `Default`.][59451]
4399 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4401 - [`char::{ToLowercase, ToUppercase}` now
4402 implement `ExactSizeIterator`.][58778]
4403 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4404 - [Removed the `Read` trait bounds
4405 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4406 - [You can now call the `dbg!` macro without any parameters to print the file
4407 and line where it is called.][57847]
4408 - [In place ASCII case conversions are now up to 4× faster.][59283]
4409 e.g. `str::make_ascii_lowercase`
4410 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4417 - [`RefCell::replace_with`]
4418 - [`RefCell::map_split`]
4420 - [`Range::contains`]
4421 - [`RangeFrom::contains`]
4422 - [`RangeTo::contains`]
4423 - [`RangeInclusive::contains`]
4424 - [`RangeToInclusive::contains`]
4425 - [`Option::copied`]
4429 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4430 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4435 - [The Rust toolchain is now available natively for musl based distros.][58575]
4437 [59460]: https://github.com/rust-lang/rust/pull/59460/
4438 [59464]: https://github.com/rust-lang/rust/pull/59464/
4439 [59500]: https://github.com/rust-lang/rust/pull/59500/
4440 [59512]: https://github.com/rust-lang/rust/pull/59512/
4441 [59580]: https://github.com/rust-lang/rust/pull/59580/
4442 [59283]: https://github.com/rust-lang/rust/pull/59283/
4443 [59451]: https://github.com/rust-lang/rust/pull/59451/
4444 [59076]: https://github.com/rust-lang/rust/pull/59076/
4445 [58778]: https://github.com/rust-lang/rust/pull/58778/
4446 [58717]: https://github.com/rust-lang/rust/pull/58717/
4447 [58369]: https://github.com/rust-lang/rust/pull/58369/
4448 [58423]: https://github.com/rust-lang/rust/pull/58423/
4449 [58080]: https://github.com/rust-lang/rust/pull/58080/
4450 [57847]: https://github.com/rust-lang/rust/pull/57847/
4451 [58575]: https://github.com/rust-lang/rust/pull/58575
4452 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4453 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4454 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4455 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4456 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4457 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4458 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4459 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4460 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4461 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4462 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4463 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4465 Version 1.34.2 (2019-05-14)
4466 ===========================
4468 * [Destabilize the `Error::type_id` function due to a security
4469 vulnerability][60785] ([CVE-2019-12083])
4471 [60785]: https://github.com/rust-lang/rust/pull/60785
4472 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4474 Version 1.34.1 (2019-04-25)
4475 ===========================
4477 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4478 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4479 * [Fix Clippy panic when checking some macros][clippy/3805]
4481 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4482 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4483 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4485 Version 1.34.0 (2019-04-11)
4486 ==========================
4490 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4491 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4493 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4494 `#[attr{}]` procedural macros.][57367]
4495 - [You can now write `extern crate self as foo;`][57407] to import your
4496 crate's root into the extern prelude.
4501 - [You can now target `riscv64imac-unknown-none-elf` and
4502 `riscv64gc-unknown-none-elf`.][58406]
4503 - [You can now enable linker plugin LTO optimisations with
4504 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4505 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4507 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4512 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4513 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4514 the `Hash` trait to create an iterator.
4515 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4516 methods.][58421] Most notably you no longer require the `Ord` trait to create
4518 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4519 for all numeric types.][58044]
4520 - [Indexing a `str` is now generic over all types that
4521 implement `SliceIndex<str>`.][57604]
4522 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4523 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4524 produce a warning if their returning type is unused.
4525 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4526 `overflowing_pow` are now available for all numeric types.][57873] These are
4527 equivalent to methods such as `wrapping_add` for the `pow` operation.
4535 * [`Error::type_id`]
4536 * [`atomic::AtomicI16`]
4537 * [`atomic::AtomicI32`]
4538 * [`atomic::AtomicI64`]
4539 * [`atomic::AtomicI8`]
4540 * [`atomic::AtomicU16`]
4541 * [`atomic::AtomicU32`]
4542 * [`atomic::AtomicU64`]
4543 * [`atomic::AtomicU8`]
4544 * [`convert::Infallible`]
4545 * [`convert::TryFrom`]
4546 * [`convert::TryInto`]
4548 * [`iter::successors`]
4549 * [`num::NonZeroI128`]
4550 * [`num::NonZeroI16`]
4551 * [`num::NonZeroI32`]
4552 * [`num::NonZeroI64`]
4553 * [`num::NonZeroI8`]
4554 * [`num::NonZeroIsize`]
4555 * [`slice::sort_by_cached_key`]
4556 * [`str::escape_debug`]
4557 * [`str::escape_default`]
4558 * [`str::escape_unicode`]
4559 * [`str::split_ascii_whitespace`]
4562 * [`Instant::checked_add`]
4563 * [`Instant::checked_sub`]
4564 * [`SystemTime::checked_add`]
4565 * [`SystemTime::checked_sub`]
4569 - [You can now use alternative registries to crates.io.][cargo/6654]
4573 - [You can now use the `?` operator in your documentation tests without manually
4574 adding `fn main() -> Result<(), _> {}`.][56470]
4578 - [`Command::before_exec` is being replaced by the unsafe method
4579 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4580 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4581 can now use `const` functions in `static` variables.
4583 [58370]: https://github.com/rust-lang/rust/pull/58370/
4584 [58406]: https://github.com/rust-lang/rust/pull/58406/
4585 [58421]: https://github.com/rust-lang/rust/pull/58421/
4586 [58166]: https://github.com/rust-lang/rust/pull/58166/
4587 [58044]: https://github.com/rust-lang/rust/pull/58044/
4588 [58057]: https://github.com/rust-lang/rust/pull/58057/
4589 [58059]: https://github.com/rust-lang/rust/pull/58059/
4590 [57809]: https://github.com/rust-lang/rust/pull/57809/
4591 [57873]: https://github.com/rust-lang/rust/pull/57873/
4592 [57604]: https://github.com/rust-lang/rust/pull/57604/
4593 [57367]: https://github.com/rust-lang/rust/pull/57367/
4594 [57407]: https://github.com/rust-lang/rust/pull/57407/
4595 [57425]: https://github.com/rust-lang/rust/pull/57425/
4596 [57106]: https://github.com/rust-lang/rust/pull/57106/
4597 [56470]: https://github.com/rust-lang/rust/pull/56470/
4598 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4599 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4600 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4601 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4602 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4603 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4604 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4605 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4606 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4607 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4608 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4609 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4610 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4611 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4612 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4613 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4614 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4615 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4616 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4617 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4618 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4619 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4620 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4621 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4622 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4623 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4624 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4625 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4626 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4627 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4628 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4631 Version 1.33.0 (2019-02-28)
4632 ==========================
4636 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4637 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4638 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4639 E.g. You can have match statement on a `u8` that covers `0..=255` and
4640 you would no longer be required to have a `_ => unreachable!()` case.
4641 - [You can now have multiple patterns in `if let` and `while let`
4642 expressions.][57532] You can do this with the same syntax as a `match`
4652 let state = Creature::Crab("Ferris");
4654 if let Creature::Crab(name) | Creature::Person(name) = state {
4655 println!("This creature's name is: {}", name);
4659 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4660 this feature will by default produce a warning as this behaviour can be
4661 unintuitive. E.g. `if let _ = 5 {}`
4662 - [You can now use `let` bindings, assignments, expression statements,
4663 and irrefutable pattern destructuring in const functions.][57175]
4664 - [You can now call unsafe const functions.][57067] E.g.
4666 const unsafe fn foo() -> i32 { 5 }
4667 const fn bar() -> i32 {
4671 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4672 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4673 - [You can now specify a specific alignment with the `#[repr(packed)]`
4674 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4675 with an alignment of 2 bytes and a size of 6 bytes.
4676 - [You can now import an item from a module as an `_`.][56303] This allows you to
4677 import a trait's impls, and not have the name in the namespace. E.g.
4679 use std::io::Read as _;
4681 // Allowed as there is only one `Read` in the module.
4684 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4688 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4689 command line argument.][56351]
4690 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4691 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4692 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4693 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4694 information on Rust's platform support.
4695 - [Added support for the `thumbv7neon-linux-androideabi` and
4696 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4697 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4701 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4702 functions for all numeric types.][57566]
4703 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4704 are now `const` functions for all numeric types.][57105]
4705 - [The methods `is_positive` and `is_negative` are now `const` functions for
4706 all signed numeric types.][57105]
4707 - [The `get` method for all `NonZero` types is now `const`.][57167]
4708 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4709 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4710 numeric types.][57234]
4711 - [`Ipv4Addr::new` is now a `const` function][57234]
4715 - [`unix::FileExt::read_exact_at`]
4716 - [`unix::FileExt::write_all_at`]
4717 - [`Option::transpose`]
4718 - [`Result::transpose`]
4719 - [`convert::identity`]
4722 - [`marker::PhantomPinned`]
4723 - [`Vec::resize_with`]
4724 - [`VecDeque::resize_with`]
4725 - [`Duration::as_millis`]
4726 - [`Duration::as_micros`]
4727 - [`Duration::as_nanos`]
4732 - [You can now publish crates that require a feature flag to compile with
4733 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4734 - [Cargo should now rebuild a crate if a file was modified during the initial
4739 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4740 are now deprecated in the standard library, and their usage will now produce a warning.
4741 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4743 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4745 - [Libtest no longer creates a new thread for each test when
4746 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4748 [56243]: https://github.com/rust-lang/rust/pull/56243
4749 [56303]: https://github.com/rust-lang/rust/pull/56303/
4750 [56351]: https://github.com/rust-lang/rust/pull/56351/
4751 [56362]: https://github.com/rust-lang/rust/pull/56362
4752 [56642]: https://github.com/rust-lang/rust/pull/56642/
4753 [56769]: https://github.com/rust-lang/rust/pull/56769/
4754 [56805]: https://github.com/rust-lang/rust/pull/56805
4755 [56947]: https://github.com/rust-lang/rust/pull/56947/
4756 [57049]: https://github.com/rust-lang/rust/pull/57049/
4757 [57067]: https://github.com/rust-lang/rust/pull/57067/
4758 [57105]: https://github.com/rust-lang/rust/pull/57105
4759 [57130]: https://github.com/rust-lang/rust/pull/57130/
4760 [57167]: https://github.com/rust-lang/rust/pull/57167/
4761 [57175]: https://github.com/rust-lang/rust/pull/57175/
4762 [57234]: https://github.com/rust-lang/rust/pull/57234/
4763 [57332]: https://github.com/rust-lang/rust/pull/57332/
4764 [57465]: https://github.com/rust-lang/rust/pull/57465/
4765 [57532]: https://github.com/rust-lang/rust/pull/57532/
4766 [57535]: https://github.com/rust-lang/rust/pull/57535/
4767 [57566]: https://github.com/rust-lang/rust/pull/57566/
4768 [57615]: https://github.com/rust-lang/rust/pull/57615/
4769 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4770 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4771 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4772 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4773 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4774 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4775 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4776 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4777 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4778 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4779 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4780 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4781 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4782 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4783 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4784 [platform-support]: https://forge.rust-lang.org/platform-support.html
4786 Version 1.32.0 (2019-01-17)
4787 ==========================
4792 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4793 operator allows you to specify zero or one repetitions similar to the `*` and
4795 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4796 now always resolve to the item (`enum`, `struct`, etc.) available in the
4797 module if present, before resolving to a external crate or an item the prelude.][56759]
4800 enum Color { Red, Green, Blue }
4806 - [You can now match against `PhantomData<T>` types.][55837]
4807 - [You can now match against literals in macros with the `literal`
4808 specifier.][56072] This will match against a literal of any type.
4809 E.g. `1`, `'A'`, `"Hello World"`
4810 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4812 struct Point(i32, i32);
4815 pub fn new(x: i32, y: i32) -> Self {
4819 pub fn is_origin(&self) -> bool {
4827 - [Self can also now be used in type definitions.][56366] E.g.
4831 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4834 Cons(T, Box<Self>) // likewise here
4837 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4838 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4842 - [The default allocator has changed from jemalloc to the default allocator on
4843 your system.][55238] The compiler itself on Linux & macOS will still use
4844 jemalloc, but programs compiled with it will use the system allocator.
4845 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4849 - [`PathBuf` now implements `FromStr`.][55148]
4850 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4851 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4852 easily debug expressions in your rust program. E.g.
4855 let b = dbg!(a * 2) + 1;
4856 // ^-- prints: [src/main.rs:4] a * 2 = 4
4860 The following APIs are now `const` functions and can be used in a
4864 - [`UnsafeCell::get`]
4865 - [`char::is_ascii`]
4867 - [`ManuallyDrop::new`]
4868 - [`ManuallyDrop::into_inner`]
4869 - [`RangeInclusive::start`]
4870 - [`RangeInclusive::end`]
4871 - [`NonNull::as_ptr`]
4874 - [`Duration::as_secs`]
4875 - [`Duration::subsec_millis`]
4876 - [`Duration::subsec_micros`]
4877 - [`Duration::subsec_nanos`]
4879 - [`Ipv4Addr::is_unspecified`]
4881 - [`Ipv6Addr::octets`]
4885 - [`i8::to_be_bytes`]
4886 - [`i8::to_le_bytes`]
4887 - [`i8::to_ne_bytes`]
4888 - [`i8::from_be_bytes`]
4889 - [`i8::from_le_bytes`]
4890 - [`i8::from_ne_bytes`]
4891 - [`i16::to_be_bytes`]
4892 - [`i16::to_le_bytes`]
4893 - [`i16::to_ne_bytes`]
4894 - [`i16::from_be_bytes`]
4895 - [`i16::from_le_bytes`]
4896 - [`i16::from_ne_bytes`]
4897 - [`i32::to_be_bytes`]
4898 - [`i32::to_le_bytes`]
4899 - [`i32::to_ne_bytes`]
4900 - [`i32::from_be_bytes`]
4901 - [`i32::from_le_bytes`]
4902 - [`i32::from_ne_bytes`]
4903 - [`i64::to_be_bytes`]
4904 - [`i64::to_le_bytes`]
4905 - [`i64::to_ne_bytes`]
4906 - [`i64::from_be_bytes`]
4907 - [`i64::from_le_bytes`]
4908 - [`i64::from_ne_bytes`]
4909 - [`i128::to_be_bytes`]
4910 - [`i128::to_le_bytes`]
4911 - [`i128::to_ne_bytes`]
4912 - [`i128::from_be_bytes`]
4913 - [`i128::from_le_bytes`]
4914 - [`i128::from_ne_bytes`]
4915 - [`isize::to_be_bytes`]
4916 - [`isize::to_le_bytes`]
4917 - [`isize::to_ne_bytes`]
4918 - [`isize::from_be_bytes`]
4919 - [`isize::from_le_bytes`]
4920 - [`isize::from_ne_bytes`]
4921 - [`u8::to_be_bytes`]
4922 - [`u8::to_le_bytes`]
4923 - [`u8::to_ne_bytes`]
4924 - [`u8::from_be_bytes`]
4925 - [`u8::from_le_bytes`]
4926 - [`u8::from_ne_bytes`]
4927 - [`u16::to_be_bytes`]
4928 - [`u16::to_le_bytes`]
4929 - [`u16::to_ne_bytes`]
4930 - [`u16::from_be_bytes`]
4931 - [`u16::from_le_bytes`]
4932 - [`u16::from_ne_bytes`]
4933 - [`u32::to_be_bytes`]
4934 - [`u32::to_le_bytes`]
4935 - [`u32::to_ne_bytes`]
4936 - [`u32::from_be_bytes`]
4937 - [`u32::from_le_bytes`]
4938 - [`u32::from_ne_bytes`]
4939 - [`u64::to_be_bytes`]
4940 - [`u64::to_le_bytes`]
4941 - [`u64::to_ne_bytes`]
4942 - [`u64::from_be_bytes`]
4943 - [`u64::from_le_bytes`]
4944 - [`u64::from_ne_bytes`]
4945 - [`u128::to_be_bytes`]
4946 - [`u128::to_le_bytes`]
4947 - [`u128::to_ne_bytes`]
4948 - [`u128::from_be_bytes`]
4949 - [`u128::from_le_bytes`]
4950 - [`u128::from_ne_bytes`]
4951 - [`usize::to_be_bytes`]
4952 - [`usize::to_le_bytes`]
4953 - [`usize::to_ne_bytes`]
4954 - [`usize::from_be_bytes`]
4955 - [`usize::from_le_bytes`]
4956 - [`usize::from_ne_bytes`]
4960 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4961 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4965 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4969 - [The argument types for AVX's
4970 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4971 been changed from `*const` to `*mut` as the previous implementation
4975 [55148]: https://github.com/rust-lang/rust/pull/55148/
4976 [55238]: https://github.com/rust-lang/rust/pull/55238/
4977 [55280]: https://github.com/rust-lang/rust/pull/55280/
4978 [55610]: https://github.com/rust-lang/rust/pull/55610/
4979 [55663]: https://github.com/rust-lang/rust/pull/55663/
4980 [55702]: https://github.com/rust-lang/rust/pull/55702/
4981 [55837]: https://github.com/rust-lang/rust/pull/55837/
4982 [55843]: https://github.com/rust-lang/rust/pull/55843/
4983 [56072]: https://github.com/rust-lang/rust/pull/56072/
4984 [56245]: https://github.com/rust-lang/rust/pull/56245/
4985 [56365]: https://github.com/rust-lang/rust/pull/56365/
4986 [56366]: https://github.com/rust-lang/rust/pull/56366/
4987 [56395]: https://github.com/rust-lang/rust/pull/56395/
4988 [56759]: https://github.com/rust-lang/rust/pull/56759/
4989 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4990 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4991 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4992 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4993 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4994 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4995 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4996 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4997 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4998 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4999 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
5000 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
5001 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
5002 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
5003 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
5004 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
5005 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
5006 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
5007 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
5008 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
5009 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
5010 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
5011 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
5012 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
5013 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
5014 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
5015 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
5016 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
5017 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
5018 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
5019 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
5020 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
5021 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
5022 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
5023 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
5024 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
5025 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
5026 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
5027 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
5028 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
5029 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
5030 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
5031 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
5032 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
5033 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
5034 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
5035 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
5036 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
5037 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
5038 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
5039 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
5040 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
5041 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
5042 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
5043 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
5044 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
5045 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
5046 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
5047 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
5048 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
5049 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
5050 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
5051 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
5052 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
5053 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
5054 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
5055 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
5056 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
5057 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
5058 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
5059 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
5060 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
5061 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
5062 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
5063 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
5064 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
5065 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
5066 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
5067 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
5068 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
5069 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
5070 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
5071 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
5072 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
5073 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
5074 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
5075 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
5076 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
5077 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
5078 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
5079 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
5080 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
5081 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
5084 Version 1.31.1 (2018-12-20)
5085 ===========================
5087 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
5088 - [Fix broken go-to-definition in RLS][rls/1171]
5089 - [Fix infinite loop on hover in RLS][rls/1170]
5091 [56562]: https://github.com/rust-lang/rust/pull/56562
5092 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
5093 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
5095 Version 1.31.0 (2018-12-06)
5096 ==========================
5100 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
5101 - [New lifetime elision rules now allow for eliding lifetimes in functions and
5102 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
5103 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
5105 - [You can now define and use `const` functions.][54835] These are currently
5106 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
5107 [language reference][const-reference] for what exactly is available.
5108 - [You can now use tool lints, which allow you to scope lints from external
5109 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
5110 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
5111 a crate, not just in exported functions.][54451]
5112 - [You can now use parentheses in pattern matches.][54497]
5116 - [Updated musl to 1.1.20][54430]
5120 - [You can now convert `num::NonZero*` types to their raw equivalents using the
5121 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
5122 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
5123 into `Option<&mut T>` using the `From` trait.][53218]
5124 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
5129 - [`slice::align_to`]
5130 - [`slice::align_to_mut`]
5131 - [`slice::chunks_exact`]
5132 - [`slice::chunks_exact_mut`]
5133 - [`slice::rchunks`]
5134 - [`slice::rchunks_mut`]
5135 - [`slice::rchunks_exact`]
5136 - [`slice::rchunks_exact_mut`]
5137 - [`Option::replace`]
5141 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
5142 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
5143 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
5145 [52813]: https://github.com/rust-lang/rust/pull/52813/
5146 [53218]: https://github.com/rust-lang/rust/pull/53218/
5147 [54057]: https://github.com/rust-lang/rust/pull/54057/
5148 [54240]: https://github.com/rust-lang/rust/pull/54240/
5149 [54430]: https://github.com/rust-lang/rust/pull/54430/
5150 [54451]: https://github.com/rust-lang/rust/pull/54451/
5151 [54497]: https://github.com/rust-lang/rust/pull/54497/
5152 [54778]: https://github.com/rust-lang/rust/pull/54778/
5153 [54835]: https://github.com/rust-lang/rust/pull/54835/
5154 [54870]: https://github.com/rust-lang/rust/pull/54870/
5155 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
5156 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
5157 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
5158 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
5159 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
5160 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
5161 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5162 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
5163 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
5164 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
5165 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
5166 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
5167 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
5168 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
5170 Version 1.30.1 (2018-11-08)
5171 ===========================
5173 - [Fixed overflow ICE in rustdoc][54199]
5174 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
5176 [54199]: https://github.com/rust-lang/rust/pull/54199
5177 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
5179 Version 1.30.0 (2018-10-25)
5180 ==========================
5184 - [Procedural macros are now available.][52081] These kinds of macros allow for
5185 more powerful code generation. There is a [new chapter available][proc-macros]
5186 in the Rust Programming Language book that goes further in depth.
5187 - [You can now use keywords as identifiers using the raw identifiers
5188 syntax (`r#`),][53236] e.g. `let r#for = true;`
5189 - [Using anonymous parameters in traits is now deprecated with a warning and
5190 will be a hard error in the 2018 edition.][53272]
5191 - [You can now use `crate` in paths.][54404] This allows you to refer to the
5192 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
5193 - [Using a external crate no longer requires being prefixed with `::`.][54404]
5194 Previously, using a external crate in a module without a use statement
5195 required `let json = ::serde_json::from_str(foo);` but can now be written
5196 as `let json = serde_json::from_str(foo);`.
5197 - [You can now apply the `#[used]` attribute to static items to prevent the
5198 compiler from optimising them away, even if they appear to be unused,][51363]
5199 e.g. `#[used] static FOO: u32 = 1;`
5200 - [You can now import and reexport macros from other crates with the `use`
5201 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
5202 the root module of the crate. If your macro relies on calling other local
5203 macros, it is recommended to export with the
5204 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
5206 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
5207 using the `vis` specifier.][53370]
5208 - [Non-macro attributes now allow all forms of literals, not just
5209 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
5210 write `#[attr(true)]`.
5211 - [You can now specify a function to handle a panic in the Rust runtime with the
5212 `#[panic_handler]` attribute.][51366]
5216 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
5217 - [Added the `aarch64-unknown-netbsd` target][53165]
5218 - [Upgraded to LLVM 8.][53611]
5222 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
5226 - [`Ipv4Addr::BROADCAST`]
5227 - [`Ipv4Addr::LOCALHOST`]
5228 - [`Ipv4Addr::UNSPECIFIED`]
5229 - [`Ipv6Addr::LOCALHOST`]
5230 - [`Ipv6Addr::UNSPECIFIED`]
5231 - [`Iterator::find_map`]
5233 The following methods are replacement methods for `trim_left`, `trim_right`,
5234 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
5236 - [`str::trim_end_matches`]
5238 - [`str::trim_start_matches`]
5239 - [`str::trim_start`]
5243 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
5244 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
5245 equivalent to calling `rustdoc --error-format=json`.
5246 - [Cargo will now provide a progress bar for builds.][cargo/5995]
5250 - [`rustdoc` allows you to specify what edition to treat your code as with the
5251 `--edition` option.][54057]
5252 - [`rustdoc` now has the `--color` (specify whether to output color) and
5253 `--error-format` (specify error format, e.g. `json`) options.][53003]
5254 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
5255 debug symbols.][53774]
5256 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
5257 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
5259 [50911]: https://github.com/rust-lang/rust/pull/50911/
5260 [51363]: https://github.com/rust-lang/rust/pull/51363/
5261 [51366]: https://github.com/rust-lang/rust/pull/51366/
5262 [52081]: https://github.com/rust-lang/rust/pull/52081/
5263 [53003]: https://github.com/rust-lang/rust/pull/53003/
5264 [53033]: https://github.com/rust-lang/rust/pull/53033/
5265 [53044]: https://github.com/rust-lang/rust/pull/53044/
5266 [53165]: https://github.com/rust-lang/rust/pull/53165/
5267 [53611]: https://github.com/rust-lang/rust/pull/53611/
5268 [53236]: https://github.com/rust-lang/rust/pull/53236/
5269 [53272]: https://github.com/rust-lang/rust/pull/53272/
5270 [53370]: https://github.com/rust-lang/rust/pull/53370/
5271 [53459]: https://github.com/rust-lang/rust/pull/53459/
5272 [53774]: https://github.com/rust-lang/rust/pull/53774/
5273 [53822]: https://github.com/rust-lang/rust/pull/53822/
5274 [54057]: https://github.com/rust-lang/rust/pull/54057/
5275 [54404]: https://github.com/rust-lang/rust/pull/54404/
5276 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
5277 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
5278 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
5279 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
5281 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
5282 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
5283 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
5284 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
5285 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
5286 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
5287 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
5288 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
5289 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
5290 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
5293 Version 1.29.2 (2018-10-11)
5294 ===========================
5296 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
5297 - The `rls-preview` component on the windows-gnu targets has been restored.
5299 [54639]: https://github.com/rust-lang/rust/pull/54639
5302 Version 1.29.1 (2018-09-25)
5303 ===========================
5308 - The standard library's `str::repeat` function contained an out of bounds write
5309 caused by an integer overflow. This has been fixed by deterministically
5310 panicking when an overflow happens.
5312 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
5316 Version 1.29.0 (2018-09-13)
5317 ==========================
5321 - [Bumped minimum LLVM version to 5.0.][51899]
5322 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
5323 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
5324 - [Upgraded to LLVM 7.][51966]
5328 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
5329 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
5330 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
5331 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
5333 - [`Cell<T>` now allows `T` to be unsized.][50494]
5334 - [`SocketAddr` is now stable on Redox.][52656]
5339 - [`Iterator::flatten`]
5344 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5345 `--locked` to disable this behavior.
5346 - [`cargo-install` will now allow you to cross compile an install
5347 using `--target`.][cargo/5614]
5348 - [Added the `cargo-fix` subcommand to automatically move project code from
5349 2015 edition to 2018.][cargo/5723]
5350 - [`cargo doc` can now optionally document private types using the
5351 `--document-private-items` flag.][cargo/5543]
5355 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5356 the specified level to that level.][52354] For example `--cap-lints warn`
5357 will demote `deny` and `forbid` lints to `warn`.
5358 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5359 fails and `101` if there is a panic.][52197]
5360 - [A preview of clippy has been made available through rustup.][51122]
5361 You can install the preview with `rustup component add clippy-preview`.
5365 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5366 Use `str::get_unchecked(begin..end)` instead.
5367 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5368 Consider using the `home_dir` function from
5369 https://crates.io/crates/dirs instead.
5370 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5371 - [`cfg` attributes and `--cfg` command line flags are now more
5372 strictly validated.][53893]
5374 [53893]: https://github.com/rust-lang/rust/pull/53893/
5375 [52861]: https://github.com/rust-lang/rust/pull/52861/
5376 [51966]: https://github.com/rust-lang/rust/pull/51966/
5377 [52656]: https://github.com/rust-lang/rust/pull/52656/
5378 [52239]: https://github.com/rust-lang/rust/pull/52239/
5379 [52330]: https://github.com/rust-lang/rust/pull/52330/
5380 [52354]: https://github.com/rust-lang/rust/pull/52354/
5381 [52402]: https://github.com/rust-lang/rust/pull/52402/
5382 [52197]: https://github.com/rust-lang/rust/pull/52197/
5383 [51807]: https://github.com/rust-lang/rust/pull/51807/
5384 [51899]: https://github.com/rust-lang/rust/pull/51899/
5385 [51912]: https://github.com/rust-lang/rust/pull/51912/
5386 [51619]: https://github.com/rust-lang/rust/pull/51619/
5387 [51656]: https://github.com/rust-lang/rust/pull/51656/
5388 [51178]: https://github.com/rust-lang/rust/pull/51178/
5389 [51122]: https://github.com/rust-lang/rust/pull/51122
5390 [50494]: https://github.com/rust-lang/rust/pull/50494/
5391 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5392 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5393 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5394 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5395 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5396 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5397 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5400 Version 1.28.0 (2018-08-02)
5401 ===========================
5405 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5406 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5407 the inner type across Foreign Function Interface (FFI) boundaries.
5408 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5409 and can now be used as identifiers.][51196]
5410 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5411 stable.][51241] This will allow users to specify a global allocator for
5413 - [Unit test functions marked with the `#[test]` attribute can now return
5414 `Result<(), E: Debug>` in addition to `()`.][51298]
5415 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5416 allows macros to easily target lifetimes.
5420 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5421 prioritise making smaller binary sizes. `z` is the same as `s` with the
5422 exception that it does not vectorise loops, which typically results in an even
5424 - [The short error format is now stable.][49546] Specified with
5425 `--error-format=short` this option will provide a more compressed output of
5426 rust error messages.
5427 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5428 - [Reduced the number of allocations in the macro parser.][50855] This can
5429 improve compile times of macro heavy crates on average by 5%.
5433 - [Implemented `Default` for `&mut str`.][51306]
5434 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5435 - [Implemented `Extend` for `()`.][50234]
5436 - [The `Debug` implementation of `time::Duration` should now be more easily
5437 human readable.][50364] Previously a `Duration` of one second would printed as
5438 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5439 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5440 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5441 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5442 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5443 for `PathBuf`.][50170]
5444 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5445 and `Wrapping<i128>`.][50465]
5446 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5447 possible.][51050] This can provide up to a 40% speed increase.
5448 - [Improved error messages when using `format!`.][50610]
5452 - [`Iterator::step_by`]
5453 - [`Path::ancestors`]
5454 - [`SystemTime::UNIX_EPOCH`]
5455 - [`alloc::GlobalAlloc`]
5457 - [`alloc::LayoutErr`]
5460 - [`alloc::alloc_zeroed`]
5461 - [`alloc::dealloc`]
5462 - [`alloc::realloc`]
5463 - [`alloc::handle_alloc_error`]
5464 - [`btree_map::Entry::or_default`]
5465 - [`fmt::Alignment`]
5466 - [`hash_map::Entry::or_default`]
5467 - [`iter::repeat_with`]
5468 - [`num::NonZeroUsize`]
5469 - [`num::NonZeroU128`]
5470 - [`num::NonZeroU16`]
5471 - [`num::NonZeroU32`]
5472 - [`num::NonZeroU64`]
5473 - [`num::NonZeroU8`]
5474 - [`ops::RangeBounds`]
5475 - [`slice::SliceIndex`]
5476 - [`slice::from_mut`]
5477 - [`slice::from_ref`]
5478 - [`{Any + Send + Sync}::downcast_mut`]
5479 - [`{Any + Send + Sync}::downcast_ref`]
5480 - [`{Any + Send + Sync}::is`]
5484 - [Cargo will now no longer allow you to publish crates with build scripts that
5485 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5486 considered to be immutable.
5490 - [The `suggestion_applicability` field in `rustc`'s json output is now
5491 stable.][50486] This will allow dev tools to check whether a code suggestion
5492 would apply to them.
5496 - [Rust will consider trait objects with duplicated constraints to be the same
5497 type as without the duplicated constraint.][51276] For example the below code will
5498 now fail to compile.
5503 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5506 impl Trait + Send + Send {
5507 fn test(&self) { println!("two"); }
5511 [49546]: https://github.com/rust-lang/rust/pull/49546/
5512 [50143]: https://github.com/rust-lang/rust/pull/50143/
5513 [50170]: https://github.com/rust-lang/rust/pull/50170/
5514 [50234]: https://github.com/rust-lang/rust/pull/50234/
5515 [50265]: https://github.com/rust-lang/rust/pull/50265/
5516 [50364]: https://github.com/rust-lang/rust/pull/50364/
5517 [50385]: https://github.com/rust-lang/rust/pull/50385/
5518 [50465]: https://github.com/rust-lang/rust/pull/50465/
5519 [50486]: https://github.com/rust-lang/rust/pull/50486/
5520 [50554]: https://github.com/rust-lang/rust/pull/50554/
5521 [50610]: https://github.com/rust-lang/rust/pull/50610/
5522 [50855]: https://github.com/rust-lang/rust/pull/50855/
5523 [51050]: https://github.com/rust-lang/rust/pull/51050/
5524 [51196]: https://github.com/rust-lang/rust/pull/51196/
5525 [51241]: https://github.com/rust-lang/rust/pull/51241/
5526 [51276]: https://github.com/rust-lang/rust/pull/51276/
5527 [51298]: https://github.com/rust-lang/rust/pull/51298/
5528 [51306]: https://github.com/rust-lang/rust/pull/51306/
5529 [51562]: https://github.com/rust-lang/rust/pull/51562/
5530 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5531 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5532 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5533 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5534 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5535 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5536 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5537 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5538 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5539 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5540 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5541 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5542 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5543 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5544 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5545 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5546 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5547 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5548 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5549 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5550 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5551 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5552 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5553 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5554 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5555 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5556 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5557 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5558 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5559 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5561 Version 1.27.2 (2018-07-20)
5562 ===========================
5567 - The borrow checker was fixed to avoid potential unsoundness when using
5568 match ergonomics: [#52213][52213].
5570 [52213]: https://github.com/rust-lang/rust/issues/52213
5572 Version 1.27.1 (2018-07-10)
5573 ===========================
5578 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5579 when running, which enabled executing code as some other user on a
5580 given machine. This release fixes that vulnerability; you can read
5581 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5583 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5588 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5589 match ergonomics: [#51415][51415], [#49534][49534].
5591 [51415]: https://github.com/rust-lang/rust/issues/51415
5592 [49534]: https://github.com/rust-lang/rust/issues/49534
5593 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5594 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5596 Version 1.27.0 (2018-06-21)
5597 ==========================
5601 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5602 be used as an identifier.
5603 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5604 bare `Trait` syntax, and should make it clearer when being used in tandem with
5605 `impl Trait` because it is equivalent to the following syntax:
5606 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5607 `Box<Trait> == Box<dyn Trait>`.
5608 - [Attributes on generic parameters such as types and lifetimes are
5609 now stable.][48851] e.g.
5610 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5611 - [The `#[must_use]` attribute can now also be used on functions as well as
5612 types.][48925] It provides a lint that by default warns users when the
5613 value returned by a function has not been used.
5617 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5621 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5622 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5623 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5624 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5625 the `cfg` attribute.
5626 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5627 std are now available in core.][49896]
5628 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5630 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5631 that the operation isn't done in place.
5632 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5633 the `#[must_use]` attribute][49533] to warn about unused potentially
5634 expensive allocations.
5638 - [`DoubleEndedIterator::rfind`]
5639 - [`DoubleEndedIterator::rfold`]
5640 - [`DoubleEndedIterator::try_rfold`]
5641 - [`Duration::from_micros`]
5642 - [`Duration::from_nanos`]
5643 - [`Duration::subsec_micros`]
5644 - [`Duration::subsec_millis`]
5645 - [`HashMap::remove_entry`]
5646 - [`Iterator::try_fold`]
5647 - [`Iterator::try_for_each`]
5649 - [`Option::filter`]
5650 - [`String::replace_range`]
5651 - [`Take::set_limit`]
5652 - [`hint::unreachable_unchecked`]
5653 - [`os::unix::process::parent_id`]
5654 - [`ptr::swap_nonoverlapping`]
5655 - [`slice::rsplit_mut`]
5657 - [`slice::swap_with_slice`]
5661 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5662 `readme`, and `repository` fields.][cargo/5386]
5663 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5664 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5665 a different directory than `target` for placing compilation artifacts.
5666 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5667 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5668 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5669 where cargo would infer a binary, Cargo will produce a warning. You can
5670 disable this feature ahead of time by setting any of the following to false:
5671 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5672 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5673 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5677 - [Added “The Rustc book” into the official documentation.][49707]
5678 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5679 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5683 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5684 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5685 compile, `"".is_empty()` will still compile.
5686 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5687 will only print the inner type.][48553] E.g.
5688 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5689 not `AtomicBool(true)`.
5690 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5691 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5692 alignment should cover all use cases.
5693 - The `.description()` method on the `std::error::Error` trait
5694 [has been soft-deprecated][50163]. It is no longer required to implement it.
5696 [48553]: https://github.com/rust-lang/rust/pull/48553/
5697 [48851]: https://github.com/rust-lang/rust/pull/48851/
5698 [48925]: https://github.com/rust-lang/rust/pull/48925/
5699 [49533]: https://github.com/rust-lang/rust/pull/49533/
5700 [49623]: https://github.com/rust-lang/rust/pull/49623/
5701 [49630]: https://github.com/rust-lang/rust/pull/49630/
5702 [49664]: https://github.com/rust-lang/rust/pull/49664/
5703 [49699]: https://github.com/rust-lang/rust/pull/49699/
5704 [49707]: https://github.com/rust-lang/rust/pull/49707/
5705 [49896]: https://github.com/rust-lang/rust/pull/49896/
5706 [49968]: https://github.com/rust-lang/rust/pull/49968/
5707 [50163]: https://github.com/rust-lang/rust/pull/50163
5708 [50177]: https://github.com/rust-lang/rust/pull/50177/
5709 [50378]: https://github.com/rust-lang/rust/pull/50378/
5710 [50423]: https://github.com/rust-lang/rust/pull/50423/
5711 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5712 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5713 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5714 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5715 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5716 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5717 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5718 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5719 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5720 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5721 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5722 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5723 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5724 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5725 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5726 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5727 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5728 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5729 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5730 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5731 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5732 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5733 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5734 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5735 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5736 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5737 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5738 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5739 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5742 Version 1.26.2 (2018-06-05)
5743 ==========================
5748 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5750 [51117]: https://github.com/rust-lang/rust/issues/51117
5753 Version 1.26.1 (2018-05-29)
5754 ==========================
5759 - [RLS now works on Windows.][50646]
5760 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5766 - [`fn main() -> impl Trait` no longer works for non-Termination
5768 This reverts an accidental stabilization.
5769 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5770 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5772 [50646]: https://github.com/rust-lang/rust/issues/50646
5773 [50656]: https://github.com/rust-lang/rust/pull/50656
5774 [50812]: https://github.com/rust-lang/rust/pull/50812
5775 [50950]: https://github.com/rust-lang/rust/issues/50950
5776 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5778 Version 1.26.0 (2018-05-10)
5779 ==========================
5783 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5784 implement either or both traits.][49299]
5785 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5786 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5787 lifetime can be elided.][49458]
5788 - [`impl Trait` is now stable allowing you to have abstract types in returns
5789 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5790 `fn open(path: impl AsRef<Path>)`.
5791 - [Pattern matching will now automatically apply dereferences.][49394]
5792 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5793 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5794 - [A lot of operations are now available in a const context.][46882] E.g. You
5795 can now index into constant arrays, reference and dereference into constants,
5796 and use tuple struct constructors.
5797 - [Fixed entry slice patterns are now stable.][48516] E.g.
5799 let points = [1, 2, 3, 4];
5801 [1, 2, 3, 4] => println!("All points were sequential."),
5802 _ => println!("Not all points were sequential."),
5809 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5810 - [Fixed exponential projection complexity on nested types.][48296]
5811 This can provide up to a ~12% reduction in compile times for certain crates.
5812 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5813 to remap path prefixes outputted by the compiler.
5814 - [Added `powerpc-unknown-netbsd` target.][48281]
5818 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5819 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5820 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5821 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5822 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5823 - [`ascii::escape_default` is now available in libcore.][48735]
5824 - [Trailing commas are now supported in std and core macros.][48056]
5825 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5826 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5831 - [`*const T::copy_to_nonoverlapping`]
5832 - [`*const T::copy_to`]
5833 - [`*const T::read_unaligned`]
5834 - [`*const T::read_volatile`]
5835 - [`*const T::read`]
5837 - [`*const T::wrapping_add`]
5838 - [`*const T::wrapping_sub`]
5840 - [`*mut T::copy_to_nonoverlapping`]
5841 - [`*mut T::copy_to`]
5842 - [`*mut T::read_unaligned`]
5843 - [`*mut T::read_volatile`]
5845 - [`*mut T::replace`]
5848 - [`*mut T::wrapping_add`]
5849 - [`*mut T::wrapping_sub`]
5850 - [`*mut T::write_bytes`]
5851 - [`*mut T::write_unaligned`]
5852 - [`*mut T::write_volatile`]
5855 - [`FromUtf8Error::as_bytes`]
5856 - [`LocalKey::try_with`]
5857 - [`Option::cloned`]
5858 - [`btree_map::Entry::and_modify`]
5859 - [`fs::read_to_string`]
5862 - [`hash_map::Entry::and_modify`]
5863 - [`iter::FusedIterator`]
5864 - [`ops::RangeInclusive`]
5865 - [`ops::RangeToInclusive`]
5867 - [`slice::rotate_left`]
5868 - [`slice::rotate_right`]
5869 - [`String::retain`]
5874 - [Cargo will now output path to custom commands when `-v` is
5875 passed with `--list`][cargo/5041]
5876 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5880 - [The second edition of "The Rust Programming Language" book is now recommended
5881 over the first.][48404]
5886 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5887 syntax is now invalid.
5889 use std::ops::Fn as dyn;
5890 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5892 - [The result of dereferences are no longer promoted to `'static`.][47408]
5896 const PAIR: &(i32, i32) = &(0, 1);
5897 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5900 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5901 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5903 - [Removed hoedown from rustdoc.][48274]
5904 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5906 [46882]: https://github.com/rust-lang/rust/pull/46882
5907 [47379]: https://github.com/rust-lang/rust/pull/47379
5908 [47408]: https://github.com/rust-lang/rust/pull/47408
5909 [47813]: https://github.com/rust-lang/rust/pull/47813
5910 [48056]: https://github.com/rust-lang/rust/pull/48056
5911 [48125]: https://github.com/rust-lang/rust/pull/48125
5912 [48235]: https://github.com/rust-lang/rust/pull/48235
5913 [48274]: https://github.com/rust-lang/rust/pull/48274
5914 [48281]: https://github.com/rust-lang/rust/pull/48281
5915 [48296]: https://github.com/rust-lang/rust/pull/48296
5916 [48326]: https://github.com/rust-lang/rust/pull/48326
5917 [48359]: https://github.com/rust-lang/rust/pull/48359
5918 [48404]: https://github.com/rust-lang/rust/pull/48404
5919 [48481]: https://github.com/rust-lang/rust/pull/48481
5920 [48516]: https://github.com/rust-lang/rust/pull/48516
5921 [48628]: https://github.com/rust-lang/rust/pull/48628
5922 [48629]: https://github.com/rust-lang/rust/pull/48629
5923 [48657]: https://github.com/rust-lang/rust/pull/48657
5924 [48735]: https://github.com/rust-lang/rust/pull/48735
5925 [48978]: https://github.com/rust-lang/rust/pull/48978
5926 [49101]: https://github.com/rust-lang/rust/pull/49101
5927 [49109]: https://github.com/rust-lang/rust/pull/49109
5928 [49162]: https://github.com/rust-lang/rust/pull/49162
5929 [49255]: https://github.com/rust-lang/rust/pull/49255
5930 [49299]: https://github.com/rust-lang/rust/pull/49299
5931 [49305]: https://github.com/rust-lang/rust/pull/49305
5932 [49394]: https://github.com/rust-lang/rust/pull/49394
5933 [49458]: https://github.com/rust-lang/rust/pull/49458
5934 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5935 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5936 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5937 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5938 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5939 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5940 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5941 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5942 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5943 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5944 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5945 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5946 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5947 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5948 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5949 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5950 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5951 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5952 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5953 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5954 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5955 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5956 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5957 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5958 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5959 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5960 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5961 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5962 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5963 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5964 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5965 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5966 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5967 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5968 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5969 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5970 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5971 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5972 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5973 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5974 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5975 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5978 Version 1.25.0 (2018-03-29)
5979 ==========================
5983 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5984 - [You can now use nested groups of imports.][47948]
5985 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5986 - [You can now have `|` at the start of a match arm.][47947] e.g.
5988 enum Foo { A, B, C }
5994 | Foo::B => println!("AB"),
5995 | Foo::C => println!("C"),
6002 - [Upgraded to LLVM 6.][47828]
6003 - [Added `-C lto=val` option.][47521]
6004 - [Added `i586-unknown-linux-musl` target][47282]
6008 - [Impl Send for `process::Command` on Unix.][47760]
6009 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
6010 - [`UnsafeCell::into_inner` is now safe.][47204]
6011 - [Implement libstd for CloudABI.][47268]
6012 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
6013 - [Implement `AsRef<Path>` for Component][46985]
6014 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
6015 - [Moved `Duration` to libcore.][46666]
6019 - [`Location::column`]
6022 The following functions can now be used in a constant expression.
6023 eg. `static MINUTE: Duration = Duration::from_secs(60);`
6024 - [`Duration::new`][47300]
6025 - [`Duration::from_secs`][47300]
6026 - [`Duration::from_millis`][47300]
6030 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
6031 - [`cargo new` now defaults to creating a binary crate, instead of a
6032 library crate.][cargo/5029]
6036 - [Rust by example is now shipped with new releases][46196]
6040 - [Deprecated `net::lookup_host`.][47510]
6041 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
6042 - The borrow checker was sometimes incorrectly permitting overlapping borrows
6043 around indexing operations (see [#47349][47349]). This has been fixed (which also
6044 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
6045 - [Removed deprecated unstable attribute `#[simd]`.][47251]
6047 [33903]: https://github.com/rust-lang/rust/pull/33903
6048 [47947]: https://github.com/rust-lang/rust/pull/47947
6049 [47948]: https://github.com/rust-lang/rust/pull/47948
6050 [47760]: https://github.com/rust-lang/rust/pull/47760
6051 [47790]: https://github.com/rust-lang/rust/pull/47790
6052 [47828]: https://github.com/rust-lang/rust/pull/47828
6053 [47398]: https://github.com/rust-lang/rust/pull/47398
6054 [47510]: https://github.com/rust-lang/rust/pull/47510
6055 [47521]: https://github.com/rust-lang/rust/pull/47521
6056 [47204]: https://github.com/rust-lang/rust/pull/47204
6057 [47251]: https://github.com/rust-lang/rust/pull/47251
6058 [47268]: https://github.com/rust-lang/rust/pull/47268
6059 [47282]: https://github.com/rust-lang/rust/pull/47282
6060 [47300]: https://github.com/rust-lang/rust/pull/47300
6061 [47349]: https://github.com/rust-lang/rust/pull/47349
6062 [46931]: https://github.com/rust-lang/rust/pull/46931
6063 [46985]: https://github.com/rust-lang/rust/pull/46985
6064 [47006]: https://github.com/rust-lang/rust/pull/47006
6065 [46830]: https://github.com/rust-lang/rust/pull/46830
6066 [46095]: https://github.com/rust-lang/rust/pull/46095
6067 [46666]: https://github.com/rust-lang/rust/pull/46666
6068 [46196]: https://github.com/rust-lang/rust/pull/46196
6069 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
6070 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
6071 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
6072 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
6073 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
6076 Version 1.24.1 (2018-03-01)
6077 ==========================
6079 - [Do not abort when unwinding through FFI][48251]
6080 - [Emit UTF-16 files for linker arguments on Windows][48318]
6081 - [Make the error index generator work again][48308]
6082 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
6084 [48251]: https://github.com/rust-lang/rust/issues/48251
6085 [48308]: https://github.com/rust-lang/rust/issues/48308
6086 [48318]: https://github.com/rust-lang/rust/issues/48318
6087 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
6090 Version 1.24.0 (2018-02-15)
6091 ==========================
6095 - [External `sysv64` ffi is now available.][46528]
6096 eg. `extern "sysv64" fn foo () {}`
6100 - [rustc now uses 16 codegen units by default for release builds.][46910]
6101 For the fastest builds, utilize `codegen-units=1`.
6102 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
6103 - [Add `aarch64-unknown-openbsd` support][46760]
6107 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
6108 improvement in performance in the majority of cases.
6109 - [`OsStr`'s `Debug` implementation is now lossless and consistent
6110 with Windows.][46798]
6111 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
6112 - [impl `From<bool>` for `AtomicBool`][46293]
6113 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
6114 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
6115 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
6116 - [float::from_bits now just uses transmute.][46012] This provides
6117 some optimisations from LLVM.
6118 - [Copied `AsciiExt` methods onto `char`][46077]
6119 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
6120 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
6121 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
6122 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
6126 - [`RefCell::replace`]
6128 - [`atomic::spin_loop_hint`]
6130 The following functions can now be used in a constant expression.
6131 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
6133 - [`AtomicBool::new`][46287]
6134 - [`AtomicUsize::new`][46287]
6135 - [`AtomicIsize::new`][46287]
6136 - [`AtomicPtr::new`][46287]
6137 - [`Cell::new`][46287]
6138 - [`{integer}::min_value`][46287]
6139 - [`{integer}::max_value`][46287]
6140 - [`mem::size_of`][46287]
6141 - [`mem::align_of`][46287]
6142 - [`ptr::null`][46287]
6143 - [`ptr::null_mut`][46287]
6144 - [`RefCell::new`][46287]
6145 - [`UnsafeCell::new`][46287]
6149 - [Added a `workspace.default-members` config that
6150 overrides implied `--all` in virtual workspaces.][cargo/4743]
6151 - [Enable incremental by default on development builds.][cargo/4817] Also added
6152 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
6153 per-project or global basis respectively.
6160 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
6161 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
6162 in accordance with IETF RFC 4291 §2.2.
6163 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
6164 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
6165 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
6166 - [Leading zeros in tuple struct members is now an error][47084]
6167 - [`column!()` macro is one-based instead of zero-based][46977]
6168 - [`fmt::Arguments` can no longer be shared across threads][45198]
6169 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
6170 - [Cargo sets a different working directory for the compiler][cargo/4788]
6172 [44884]: https://github.com/rust-lang/rust/pull/44884
6173 [45198]: https://github.com/rust-lang/rust/pull/45198
6174 [45506]: https://github.com/rust-lang/rust/pull/45506
6175 [45990]: https://github.com/rust-lang/rust/pull/45990
6176 [46012]: https://github.com/rust-lang/rust/pull/46012
6177 [46077]: https://github.com/rust-lang/rust/pull/46077
6178 [46094]: https://github.com/rust-lang/rust/pull/46094
6179 [46284]: https://github.com/rust-lang/rust/pull/46284
6180 [46287]: https://github.com/rust-lang/rust/pull/46287
6181 [46293]: https://github.com/rust-lang/rust/pull/46293
6182 [46528]: https://github.com/rust-lang/rust/pull/46528
6183 [46671]: https://github.com/rust-lang/rust/pull/46671
6184 [46713]: https://github.com/rust-lang/rust/pull/46713
6185 [46735]: https://github.com/rust-lang/rust/pull/46735
6186 [46760]: https://github.com/rust-lang/rust/pull/46760
6187 [46798]: https://github.com/rust-lang/rust/pull/46798
6188 [46828]: https://github.com/rust-lang/rust/pull/46828
6189 [46831]: https://github.com/rust-lang/rust/pull/46831
6190 [46833]: https://github.com/rust-lang/rust/pull/46833
6191 [46910]: https://github.com/rust-lang/rust/pull/46910
6192 [46977]: https://github.com/rust-lang/rust/pull/46977
6193 [47018]: https://github.com/rust-lang/rust/pull/47018
6194 [47080]: https://github.com/rust-lang/rust/pull/47080
6195 [47084]: https://github.com/rust-lang/rust/pull/47084
6196 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
6197 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
6198 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
6199 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
6200 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
6201 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
6204 Version 1.23.0 (2018-01-04)
6205 ==========================
6209 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
6210 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
6211 Which should fix some confusing errors in some operations.
6215 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
6216 undefined behavior.][45920]
6217 - [rustc now suggests renaming import if names clash.][45660]
6218 - [Display errors/warnings correctly when there are zero-width or
6219 wide characters.][45711]
6220 - [rustc now avoids unnecessary copies of arguments that are
6221 simple bindings][45380] This should improve memory usage on average by 5-10%.
6222 - [Updated musl used to build musl rustc to 1.1.17][45393]
6226 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
6227 - [Implement Hash for raw pointers to unsized types][45483]
6228 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
6229 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
6230 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
6231 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
6232 and `<*mut T>::as_mut`][44932]
6233 - [Optimized `Thread::{park, unpark}` implementation][45524]
6234 - [Improved `SliceExt::binary_search` performance.][45333]
6235 - [impl `FromIterator<()>` for `()`][45379]
6236 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
6244 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
6245 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
6246 - [Added unit test checking to `cargo check`][cargo/4592]
6247 - [Cargo now lets you install a specific version
6248 using `cargo install --version`][cargo/4637]
6252 - [Releases now ship with the Cargo book documentation.][45692]
6253 - [rustdoc now prints rendering warnings on every run.][45324]
6257 - [Changes have been made to type equality to make it more correct,
6258 in rare cases this could break some code.][45853] [Tracking issue for
6259 further information][45852]
6260 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
6261 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
6262 Android 9, the minimum supported version is Android 14.
6263 - [Bumped the minimum LLVM to 3.9][45326]
6265 [44042]: https://github.com/rust-lang/rust/pull/44042
6266 [44932]: https://github.com/rust-lang/rust/pull/44932
6267 [45267]: https://github.com/rust-lang/rust/pull/45267
6268 [45324]: https://github.com/rust-lang/rust/pull/45324
6269 [45326]: https://github.com/rust-lang/rust/pull/45326
6270 [45333]: https://github.com/rust-lang/rust/pull/45333
6271 [45379]: https://github.com/rust-lang/rust/pull/45379
6272 [45380]: https://github.com/rust-lang/rust/pull/45380
6273 [45393]: https://github.com/rust-lang/rust/pull/45393
6274 [45435]: https://github.com/rust-lang/rust/pull/45435
6275 [45483]: https://github.com/rust-lang/rust/pull/45483
6276 [45524]: https://github.com/rust-lang/rust/pull/45524
6277 [45571]: https://github.com/rust-lang/rust/pull/45571
6278 [45580]: https://github.com/rust-lang/rust/pull/45580
6279 [45610]: https://github.com/rust-lang/rust/pull/45610
6280 [45660]: https://github.com/rust-lang/rust/pull/45660
6281 [45692]: https://github.com/rust-lang/rust/pull/45692
6282 [45711]: https://github.com/rust-lang/rust/pull/45711
6283 [45772]: https://github.com/rust-lang/rust/pull/45772
6284 [45852]: https://github.com/rust-lang/rust/issues/45852
6285 [45853]: https://github.com/rust-lang/rust/pull/45853
6286 [45887]: https://github.com/rust-lang/rust/pull/45887
6287 [45920]: https://github.com/rust-lang/rust/pull/45920
6288 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
6289 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
6290 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
6293 Version 1.22.1 (2017-11-22)
6294 ==========================
6296 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
6298 [46183]: https://github.com/rust-lang/rust/pull/46183
6300 Version 1.22.0 (2017-11-22)
6301 ==========================
6305 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
6306 - [Now accepts underscores in unicode escapes][43716]
6307 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
6308 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
6312 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
6313 - [rustc will no longer inline in codegen units when compiling for debug][45075]
6314 This should decrease compile times for debug builds.
6315 - [strict memory alignment now enabled on ARMv6][45094]
6316 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
6320 - [Allow atomic operations up to 32 bits
6321 on `armv5te_unknown_linux_gnueabi`][44978]
6322 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
6323 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
6324 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
6325 - [Properly detect overflow in `Instant += Duration`.][44220]
6326 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
6327 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
6328 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
6335 - [Cargo will now build multi file examples in subdirectories of the `examples`
6336 folder that have a `main.rs` file.][cargo/4496]
6337 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
6338 the old format will continue to work and can be updated with `cargo update`.
6339 - [Now supports vendoring git repositories][cargo/3992]
6343 - [`libbacktrace` is now available on Apple platforms.][44251]
6344 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6345 This now lets you specify that a given code example will fail to compile.
6349 - [The minimum Android version that rustc can build for has been bumped
6350 to `4.0` from `2.3`][45656]
6351 - [Allowing `T op= &T` for numeric types has broken some type
6352 inference cases][45480]
6355 [42526]: https://github.com/rust-lang/rust/pull/42526
6356 [43716]: https://github.com/rust-lang/rust/pull/43716
6357 [43949]: https://github.com/rust-lang/rust/pull/43949
6358 [44015]: https://github.com/rust-lang/rust/pull/44015
6359 [44220]: https://github.com/rust-lang/rust/pull/44220
6360 [44251]: https://github.com/rust-lang/rust/pull/44251
6361 [44287]: https://github.com/rust-lang/rust/pull/44287
6362 [44303]: https://github.com/rust-lang/rust/pull/44303
6363 [44456]: https://github.com/rust-lang/rust/pull/44456
6364 [44466]: https://github.com/rust-lang/rust/pull/44466
6365 [44895]: https://github.com/rust-lang/rust/pull/44895
6366 [44966]: https://github.com/rust-lang/rust/pull/44966
6367 [44978]: https://github.com/rust-lang/rust/pull/44978
6368 [45041]: https://github.com/rust-lang/rust/pull/45041
6369 [45064]: https://github.com/rust-lang/rust/pull/45064
6370 [45075]: https://github.com/rust-lang/rust/pull/45075
6371 [45094]: https://github.com/rust-lang/rust/pull/45094
6372 [45095]: https://github.com/rust-lang/rust/pull/45095
6373 [45480]: https://github.com/rust-lang/rust/issues/45480
6374 [45656]: https://github.com/rust-lang/rust/pull/45656
6375 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6376 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6377 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6384 Version 1.21.0 (2017-10-12)
6385 ==========================
6389 - [You can now use static references for literals.][43838]
6393 let x: &'static u32 = &0;
6396 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6399 my_macro!(Vec<i32>::new); // Always worked
6400 my_macro!(Vec::<i32>::new); // Now works
6405 - [Upgraded jemalloc to 4.5.0][43911]
6406 - [Enabled unwinding panics on Redox][43917]
6407 - [Now runs LLVM in parallel during translation phase.][43506]
6408 This should reduce peak memory usage.
6412 - [Generate builtin impls for `Clone` for all arrays and tuples that
6413 are `T: Clone`][43690]
6414 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6415 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6416 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6421 [`std::mem::discriminant`]
6425 - [You can now call `cargo install` with multiple package names][cargo/4216]
6426 - [Cargo commands inside a virtual workspace will now implicitly
6427 pass `--all`][cargo/4335]
6428 - [Added a `[patch]` section to `Cargo.toml` to handle
6429 prepublication dependencies][cargo/4123] [RFC 1969]
6430 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6431 like patterns][cargo/4270]
6432 - [Added the `--all-targets` option][cargo/4400]
6433 - [Using required dependencies as a feature is now deprecated and emits
6434 a warning][cargo/4364]
6439 - [Cargo docs are moving][43916]
6440 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6441 - [The rustdoc book is now available][43863]
6442 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6443 - [Added a preview of RLS has been made available through rustup][44204]
6444 Install with `rustup component add rls-preview`
6445 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6446 Previously only showed `std::os::unix`.
6450 - [Changes in method matching against higher-ranked types][43880] This may cause
6451 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6452 - [rustc's JSON error output's byte position start at top of file.][42973]
6453 Was previously relative to the rustc's internal `CodeMap` struct which
6454 required the unstable library `libsyntax` to correctly use.
6455 - [`unused_results` lint no longer ignores booleans][43728]
6457 [42565]: https://github.com/rust-lang/rust/pull/42565
6458 [42973]: https://github.com/rust-lang/rust/pull/42973
6459 [43348]: https://github.com/rust-lang/rust/pull/43348
6460 [43459]: https://github.com/rust-lang/rust/pull/43459
6461 [43506]: https://github.com/rust-lang/rust/pull/43506
6462 [43540]: https://github.com/rust-lang/rust/pull/43540
6463 [43690]: https://github.com/rust-lang/rust/pull/43690
6464 [43728]: https://github.com/rust-lang/rust/pull/43728
6465 [43838]: https://github.com/rust-lang/rust/pull/43838
6466 [43863]: https://github.com/rust-lang/rust/pull/43863
6467 [43880]: https://github.com/rust-lang/rust/pull/43880
6468 [43911]: https://github.com/rust-lang/rust/pull/43911
6469 [43916]: https://github.com/rust-lang/rust/pull/43916
6470 [43917]: https://github.com/rust-lang/rust/pull/43917
6471 [44204]: https://github.com/rust-lang/rust/pull/44204
6472 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6473 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6474 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6475 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6476 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6477 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6478 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6479 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6480 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6482 Version 1.20.0 (2017-08-31)
6483 ===========================
6487 - [Associated constants are now stabilised.][42809]
6488 - [A lot of macro bugs are now fixed.][42913]
6493 - [Struct fields are now properly coerced to the expected field type.][42807]
6494 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6495 `wasm32-experimental-emscripten` target.
6496 - [Changed some of the error messages to be more helpful.][42033]
6497 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6499 - [rustc now reports the total number of errors on compilation failure][43015]
6500 previously this was only the number of errors in the pass that failed.
6501 - [Expansion in rustc has been sped up 29x.][42533]
6502 - [added `msp430-none-elf` target.][43099]
6503 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6505 - [Fixes backtraces on Redox][43228]
6506 - [rustc now identifies different versions of same crate when absolute paths of
6507 different types match in an error message.][42826]
6513 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6514 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6516 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6517 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6518 - [Impl `Clone` for `DefaultHasher`.][42799]
6519 - [Impl `Sync` for `SyncSender`.][42397]
6520 - [Impl `FromStr` for `char`][42271]
6521 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6523 - [allow messages in the `unimplemented!()` macro.][42155]
6524 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6525 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6526 - [Upgrade to Unicode 10.0.0][42999]
6527 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6528 - [Skip the main thread's manual stack guard on Linux][43072]
6529 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6530 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6532 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6537 - [`CStr::into_c_string`]
6538 - [`CString::as_c_str`]
6539 - [`CString::into_boxed_c_str`]
6540 - [`Chain::get_mut`]
6541 - [`Chain::get_ref`]
6542 - [`Chain::into_inner`]
6543 - [`Option::get_or_insert_with`]
6544 - [`Option::get_or_insert`]
6545 - [`OsStr::into_os_string`]
6546 - [`OsString::into_boxed_os_str`]
6549 - [`Utf8Error::error_len`]
6550 - [`char::EscapeDebug`]
6551 - [`char::escape_debug`]
6552 - [`compile_error!`]
6553 - [`f32::from_bits`]
6555 - [`f64::from_bits`]
6557 - [`mem::ManuallyDrop`]
6558 - [`slice::sort_unstable_by_key`]
6559 - [`slice::sort_unstable_by`]
6560 - [`slice::sort_unstable`]
6561 - [`str::from_boxed_utf8_unchecked`]
6562 - [`str::as_bytes_mut`]
6563 - [`str::as_bytes_mut`]
6564 - [`str::from_utf8_mut`]
6565 - [`str::from_utf8_unchecked_mut`]
6567 - [`str::get_unchecked_mut`]
6568 - [`str::get_unchecked`]
6570 - [`str::into_boxed_bytes`]
6575 - [Cargo API token location moved from `~/.cargo/config` to
6576 `~/.cargo/credentials`.][cargo/3978]
6577 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6578 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6579 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6580 - [You can now specify version of a binary when installed through
6581 `cargo install` using `--vers`.][cargo/4229]
6582 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6583 failure.][cargo/4248]
6584 - [Changed the convention around which file is the crate root.][cargo/4259]
6589 - [Functions with `'static` in their return types will now not be as usable as
6590 if they were using lifetime parameters instead.][42417]
6591 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6592 takes the sign of NaN into account where previously didn't.][42430]
6594 [42033]: https://github.com/rust-lang/rust/pull/42033
6595 [42155]: https://github.com/rust-lang/rust/pull/42155
6596 [42271]: https://github.com/rust-lang/rust/pull/42271
6597 [42397]: https://github.com/rust-lang/rust/pull/42397
6598 [42417]: https://github.com/rust-lang/rust/pull/42417
6599 [42430]: https://github.com/rust-lang/rust/pull/42430
6600 [42431]: https://github.com/rust-lang/rust/pull/42431
6601 [42533]: https://github.com/rust-lang/rust/pull/42533
6602 [42571]: https://github.com/rust-lang/rust/pull/42571
6603 [42613]: https://github.com/rust-lang/rust/pull/42613
6604 [42799]: https://github.com/rust-lang/rust/pull/42799
6605 [42807]: https://github.com/rust-lang/rust/pull/42807
6606 [42809]: https://github.com/rust-lang/rust/pull/42809
6607 [42822]: https://github.com/rust-lang/rust/pull/42822
6608 [42826]: https://github.com/rust-lang/rust/pull/42826
6609 [42854]: https://github.com/rust-lang/rust/pull/42854
6610 [42913]: https://github.com/rust-lang/rust/pull/42913
6611 [42999]: https://github.com/rust-lang/rust/pull/42999
6612 [43011]: https://github.com/rust-lang/rust/pull/43011
6613 [43015]: https://github.com/rust-lang/rust/pull/43015
6614 [43072]: https://github.com/rust-lang/rust/pull/43072
6615 [43077]: https://github.com/rust-lang/rust/pull/43077
6616 [43097]: https://github.com/rust-lang/rust/pull/43097
6617 [43099]: https://github.com/rust-lang/rust/pull/43099
6618 [43170]: https://github.com/rust-lang/rust/pull/43170
6619 [43178]: https://github.com/rust-lang/rust/pull/43178
6620 [43185]: https://github.com/rust-lang/rust/pull/43185
6621 [43228]: https://github.com/rust-lang/rust/pull/43228
6622 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6623 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6624 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6625 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6626 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6627 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6628 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6629 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6630 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6631 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6632 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6633 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6634 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6635 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6636 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6637 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6638 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6639 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6640 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6641 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6642 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6643 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6644 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6645 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6646 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6647 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6648 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6649 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6650 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6651 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6652 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6653 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6654 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6655 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6656 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6657 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6658 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6659 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6662 Version 1.19.0 (2017-07-20)
6663 ===========================
6668 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6669 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6670 - [Macro recursion limit increased to 1024 from 64.][41676]
6671 - [Added lint for detecting unused macros.][41907]
6672 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6673 For example: `let x = loop { break 7; };`
6674 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6675 contain `Copy` types and cannot have a `Drop` implementation.
6676 Example: `union Foo { bar: u8, baz: usize }`
6677 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6678 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6683 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6684 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6685 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6686 you should use `--target armv7-linux-androideabi`.
6687 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6688 - [Minor optimisation of string operations.][42037]
6689 - [Compiler error message is now `aborting due to previous error(s)` instead of
6690 `aborting due to N previous errors`][42150] This was previously inaccurate and
6691 would only count certain kinds of errors.
6692 - [The compiler now supports Visual Studio 2017][42225]
6693 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6694 - [Added a lot][42264] of [new error codes][42302]
6695 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6696 libraries with C Run-time Libraries(CRT) to be statically linked.
6697 - [Fixed various ARM codegen bugs][42740]
6702 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6703 `Extend<Cow<'a, str>>`][41449]
6704 - [`Vec` now implements `From<&mut [T]>`][41530]
6705 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6706 - [`SplitWhitespace` now implements `Clone`][41659]
6707 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6709 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6710 macros, but for printing to stderr.
6715 - [`OsString::shrink_to_fit`]
6718 - [`thread::ThreadId`]
6723 - [Build scripts can now add environment variables to the environment
6724 the crate is being compiled in.
6725 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6726 - [Subcommands now replace the current process rather than spawning a new
6727 child process][cargo/3970]
6728 - [Workspace members can now accept glob file patterns][cargo/3979]
6729 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6730 the members in a given workspace.][cargo/3988]
6731 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6732 - [Target directory path is now in the cargo metadata][cargo/4022]
6733 - [Cargo no longer checks out a local working directory for the
6734 crates.io index][cargo/4026] This should provide smaller file size for the
6735 registry, and improve cloning times, especially on Windows machines.
6736 - [Added an `--exclude` option for excluding certain packages when using the
6737 `--all` option][cargo/4031]
6738 - [Cargo will now automatically retry when receiving a 5xx error
6739 from crates.io][cargo/4032]
6740 - [The `--features` option now accepts multiple comma or space
6741 delimited values.][cargo/4084]
6742 - [Added support for custom target specific runners][cargo/3954]
6747 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6749 - [Rust will now release XZ compressed packages][rust-installer/57]
6750 - [rustup will now prefer to download rust packages with
6751 XZ compression][rustup/1100] over GZip packages.
6752 - [Added the ability to escape `#` in rust documentation][41785] By adding
6753 additional `#`'s ie. `##` is now `#`
6758 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6759 - [`-Z` flags are now no longer allowed to be used on the stable
6760 compiler.][41751] This has been a warning for a year previous to this.
6761 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6762 longer works][42844]. Users should migrate to the built-in `check`
6763 command, which has been available since 1.16.
6764 - [Ending a float literal with `._` is now a hard error.
6765 Example: `42._` .][41946]
6766 - [Any use of a private `extern crate` outside of its module is now a
6767 hard error.][36886] This was previously a warning.
6768 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6769 relative while the `::` prefix makes a path absolute, but was ignored and the
6770 path was relative regardless.
6771 - [Floating point constants in match patterns is now a hard error][36890]
6772 This was previously a warning.
6773 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6774 match patterns is now a hard error][36891] This was previously a warning.
6775 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6777 - [From the pound escape, lines consisting of multiple `#`s are
6779 - [It is an error to re-export private enum variants][42460]. This is
6780 known to break a number of crates that depend on an older version of
6782 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6783 to use it to find the linker, and the build will fail where it did
6784 not previously][42607]
6786 [36886]: https://github.com/rust-lang/rust/issues/36886
6787 [36888]: https://github.com/rust-lang/rust/issues/36888
6788 [36890]: https://github.com/rust-lang/rust/issues/36890
6789 [36891]: https://github.com/rust-lang/rust/issues/36891
6790 [36892]: https://github.com/rust-lang/rust/issues/36892
6791 [37406]: https://github.com/rust-lang/rust/issues/37406
6792 [39983]: https://github.com/rust-lang/rust/pull/39983
6793 [41145]: https://github.com/rust-lang/rust/pull/41145
6794 [41192]: https://github.com/rust-lang/rust/pull/41192
6795 [41258]: https://github.com/rust-lang/rust/pull/41258
6796 [41370]: https://github.com/rust-lang/rust/pull/41370
6797 [41449]: https://github.com/rust-lang/rust/pull/41449
6798 [41530]: https://github.com/rust-lang/rust/pull/41530
6799 [41624]: https://github.com/rust-lang/rust/pull/41624
6800 [41656]: https://github.com/rust-lang/rust/pull/41656
6801 [41659]: https://github.com/rust-lang/rust/pull/41659
6802 [41676]: https://github.com/rust-lang/rust/pull/41676
6803 [41751]: https://github.com/rust-lang/rust/pull/41751
6804 [41764]: https://github.com/rust-lang/rust/pull/41764
6805 [41785]: https://github.com/rust-lang/rust/pull/41785
6806 [41873]: https://github.com/rust-lang/rust/pull/41873
6807 [41907]: https://github.com/rust-lang/rust/pull/41907
6808 [41946]: https://github.com/rust-lang/rust/pull/41946
6809 [42016]: https://github.com/rust-lang/rust/pull/42016
6810 [42037]: https://github.com/rust-lang/rust/pull/42037
6811 [42068]: https://github.com/rust-lang/rust/pull/42068
6812 [42150]: https://github.com/rust-lang/rust/pull/42150
6813 [42162]: https://github.com/rust-lang/rust/pull/42162
6814 [42225]: https://github.com/rust-lang/rust/pull/42225
6815 [42264]: https://github.com/rust-lang/rust/pull/42264
6816 [42302]: https://github.com/rust-lang/rust/pull/42302
6817 [42460]: https://github.com/rust-lang/rust/issues/42460
6818 [42607]: https://github.com/rust-lang/rust/issues/42607
6819 [42740]: https://github.com/rust-lang/rust/pull/42740
6820 [42844]: https://github.com/rust-lang/rust/issues/42844
6821 [42948]: https://github.com/rust-lang/rust/pull/42948
6822 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6823 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6824 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6825 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6826 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6827 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6828 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6829 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6830 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6831 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6832 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6833 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6834 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6835 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6836 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6837 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6838 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6839 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6840 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6841 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6842 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6843 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6846 Version 1.18.0 (2017-06-08)
6847 ===========================
6852 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6853 make the item visible to just that module tree. Also accepts the keyword
6854 `crate` to make something public to the whole crate but not users of the
6855 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6856 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6857 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6858 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6859 types like `Write + Send`, trailing `+` are now supported in trait objects,
6860 and better error reporting for trait objects starting with `?Sized`.
6861 - [0e+10 is now a valid floating point literal][40589]
6862 - [Now warns if you bind a lifetime parameter to 'static][40734]
6863 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6864 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6865 representation in some cases.][40377]
6870 - [rustc can now emit mir with `--emit mir`][39891]
6871 - [Improved LLVM IR for trivial functions][40367]
6872 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6873 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6874 opportunities found through profiling
6875 - [Improved backtrace formatting when panicking][38165]
6880 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6881 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6882 iteration or reallocation.
6883 - [Simplified HashMap Bucket interface][40561] provides performance
6884 improvements for iterating and cloning.
6885 - [Specialize Vec::from_elem to use calloc][40409]
6886 - [Fixed Race condition in fs::create_dir_all][39799]
6887 - [No longer caching stdio on Windows][40516]
6888 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6889 2.50%~ faster and in one case now 12.50% faster.
6890 - [Optimized `AtomicBool::fetch_nand`][41143]
6895 - [`Child::try_wait`]
6896 - [`HashMap::retain`]
6897 - [`HashSet::retain`]
6899 - [`TcpStream::peek`]
6900 - [`UdpSocket::peek`]
6901 - [`UdpSocket::peek_from`]
6906 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6907 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6908 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6909 - [Added Android build support][cargo/3885]
6910 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6911 of a certain type, for example `cargo build --bins` will build all
6913 - [Added support for haiku][cargo/3952]
6918 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6919 - [Rust now uses the official cross compiler for NetBSD][40612]
6920 - [rustdoc now accepts `#` at the start of files][40828]
6921 - [Fixed jemalloc support for musl][41168]
6926 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6927 always placed after the sign if it exists and before the digits. With the `#`
6928 flag the zeroes are placed after the prefix and before the digits.
6929 - [Due to the struct field optimisation][40377], using `transmute` on structs
6930 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6931 always been undefined behavior, but is now more likely to break in practice.
6932 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6933 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6934 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6935 - [Overlapping inherent `impl`s are now a hard error][40728]
6936 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6937 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6938 `out.asm` and `out.ll` instead of only one of the filetypes.
6939 - [ calling a function that returns `Self` will no longer work][41805] when
6940 the size of `Self` cannot be statically determined.
6941 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6942 this has caused a few regressions namely:
6944 - Changed the link order of local static/dynamic libraries (respecting the
6945 order on given rather than having the compiler reorder).
6946 - Changed how MinGW is linked, native code linked to dynamic libraries
6947 may require manually linking to the gcc support library (for the native
6950 [38165]: https://github.com/rust-lang/rust/pull/38165
6951 [39799]: https://github.com/rust-lang/rust/pull/39799
6952 [39891]: https://github.com/rust-lang/rust/pull/39891
6953 [40043]: https://github.com/rust-lang/rust/pull/40043
6954 [40241]: https://github.com/rust-lang/rust/pull/40241
6955 [40338]: https://github.com/rust-lang/rust/pull/40338
6956 [40367]: https://github.com/rust-lang/rust/pull/40367
6957 [40377]: https://github.com/rust-lang/rust/pull/40377
6958 [40409]: https://github.com/rust-lang/rust/pull/40409
6959 [40516]: https://github.com/rust-lang/rust/pull/40516
6960 [40556]: https://github.com/rust-lang/rust/pull/40556
6961 [40561]: https://github.com/rust-lang/rust/pull/40561
6962 [40589]: https://github.com/rust-lang/rust/pull/40589
6963 [40612]: https://github.com/rust-lang/rust/pull/40612
6964 [40723]: https://github.com/rust-lang/rust/pull/40723
6965 [40728]: https://github.com/rust-lang/rust/pull/40728
6966 [40731]: https://github.com/rust-lang/rust/pull/40731
6967 [40734]: https://github.com/rust-lang/rust/pull/40734
6968 [40805]: https://github.com/rust-lang/rust/pull/40805
6969 [40807]: https://github.com/rust-lang/rust/pull/40807
6970 [40828]: https://github.com/rust-lang/rust/pull/40828
6971 [40870]: https://github.com/rust-lang/rust/pull/40870
6972 [41085]: https://github.com/rust-lang/rust/pull/41085
6973 [41143]: https://github.com/rust-lang/rust/pull/41143
6974 [41168]: https://github.com/rust-lang/rust/pull/41168
6975 [41270]: https://github.com/rust-lang/rust/issues/41270
6976 [41469]: https://github.com/rust-lang/rust/pull/41469
6977 [41805]: https://github.com/rust-lang/rust/issues/41805
6978 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6979 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6980 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6981 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6982 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6983 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6984 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6985 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6986 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6987 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6988 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6989 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6990 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6991 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6994 Version 1.17.0 (2017-04-27)
6995 ===========================
7000 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
7001 * [Fields of structs may be initialized without duplicating the field/variable
7002 names][39761]. [RFC 1682]
7003 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
7004 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7005 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
7006 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
7007 `'b`. Soundness fix.
7008 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
7009 * [Static variables may contain references to other statics][40027]
7014 * [Exit quickly on only `--emit dep-info`][40336]
7015 * [Make `-C relocation-model` more correctly determine whether the linker
7016 creates a position-independent executable][40245]
7017 * [Add `-C overflow-checks` to directly control whether integer overflow
7019 * [The rustc type checker now checks items on demand instead of in a single
7020 in-order pass][40008]. This is mostly an internal refactoring in support of
7021 future work, including incremental type checking, but also resolves [RFC
7022 1647], allowing `Self` to appear in `impl` `where` clauses.
7023 * [Optimize vtable loads][39995]
7024 * [Turn off vectorization for Emscripten targets][39990]
7025 * [Provide suggestions for unknown macros imported with `use`][39953]
7026 * [Fix ICEs in path resolution][39939]
7027 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
7028 * [Add clearer error message using `&str + &str`][39116]
7039 * [`Ordering::then`]
7040 * [`Ordering::then_with`]
7041 * [`BTreeMap::range`]
7042 * [`BTreeMap::range_mut`]
7043 * [`collections::Bound`]
7044 * [`process::abort`]
7045 * [`ptr::read_unaligned`]
7046 * [`ptr::write_unaligned`]
7047 * [`Result::expect_err`]
7050 * [`Cell::into_inner`]
7056 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
7057 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
7058 * [`String` implements `FromIterator<&char>`][40028]
7059 * `Box` [implements][40009] a number of new conversions:
7060 `From<Box<str>> for String`,
7061 `From<Box<[T]>> for Vec<T>`,
7062 `From<Box<CStr>> for CString`,
7063 `From<Box<OsStr>> for OsString`,
7064 `From<Box<Path>> for PathBuf`,
7065 `Into<Box<str>> for String`,
7066 `Into<Box<[T]>> for Vec<T>`,
7067 `Into<Box<CStr>> for CString`,
7068 `Into<Box<OsStr>> for OsString`,
7069 `Into<Box<Path>> for PathBuf`,
7070 `Default for Box<str>`,
7071 `Default for Box<CStr>`,
7072 `Default for Box<OsStr>`,
7073 `From<&CStr> for Box<CStr>`,
7074 `From<&OsStr> for Box<OsStr>`,
7075 `From<&Path> for Box<Path>`
7076 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
7077 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
7078 * [Slightly optimize `slice::sort`][39538]
7079 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
7080 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
7081 `Box<str>` implements `From<&str>`][39438]
7082 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
7083 `From<(I, u16)> where I: Into<IpAddr>`][39372]
7084 * [`format!` estimates the needed capacity before writing a string][39356]
7085 * [Support unprivileged symlink creation in Windows][38921]
7086 * [`PathBuf` implements `Default`][38764]
7087 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
7088 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
7089 and poor hash functions.
7094 * [Add `cargo check --all`][cargo/3731]
7095 * [Add an option to ignore SSL revocation checking][cargo/3699]
7096 * [Add `cargo run --package`][cargo/3691]
7097 * [Add `required_features`][cargo/3667]
7098 * [Assume `build.rs` is a build script][cargo/3664]
7099 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
7104 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
7106 * [The "Unstable Book" documents nightly-only features][ubook]
7107 * [Improve the style of the sidebar in rustdoc output][40265]
7108 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
7109 * [Fix MSP430 breakage due to `i128`][40257]
7110 * [Preliminary Solaris/SPARCv9 support][39903]
7111 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
7112 run without installing the MSVC runtime.
7113 * [`rustdoc --test` includes file names in test names][39788]
7114 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
7115 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
7116 * [Initial support for `aarch64-unknown-freebsd`][39491]
7117 * [Initial support for `i686-unknown-netbsd`][39426]
7118 * [This release no longer includes the old makefile build system][39431]. Rust
7119 is built with a custom build system, written in Rust, and with Cargo.
7120 * [Add Debug implementations for libcollection structs][39002]
7121 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
7122 * [`--test-threads=0` produces an error][38945]
7123 * [`rustup` installs documentation by default][40526]
7124 * [The Rust source includes NatVis visualizations][39843]. These can be used by
7125 WinDbg and Visual Studio to improve the debugging experience.
7130 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
7131 workaround, either use MSVC 2015 or run vcvars.bat.
7132 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
7133 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
7134 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
7136 * [`format!` and `Display::to_string` panic if an underlying formatting
7137 implementation returns an error][40117]. Previously the error was silently
7138 ignored. It is incorrect for `write_fmt` to return an error when writing
7140 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
7141 crates were marked stable and could be accessed from the stable toolchain.
7142 * [Rust git source no longer includes vendored crates][39728]. Those that need
7143 to build with vendored crates should build from release tarballs.
7144 * [Fix inert attributes from `proc_macro_derives`][39572]
7145 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
7146 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
7148 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
7149 existing code generally ignores the type of dead-code unless a type-hint is
7150 provided; this can cause surprising inference interactions particularly around
7151 defaulting. The new code uniformly ignores the result type of dead-code.
7152 * [Tuple-struct constructors with private fields are no longer visible][38932]
7153 * [Lifetime parameters that do not appear in the arguments are now considered
7154 early-bound][38897], resolving a soundness bug (#[32330]). The
7155 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
7157 * [rustdoc: fix doctests with non-feature crate attributes][38161]
7158 * [Make transmuting from fn item types to pointer-sized types a hard
7161 [27787]: https://github.com/rust-lang/rust/issues/27787
7162 [32330]: https://github.com/rust-lang/rust/issues/32330
7163 [34198]: https://github.com/rust-lang/rust/pull/34198
7164 [38161]: https://github.com/rust-lang/rust/pull/38161
7165 [38368]: https://github.com/rust-lang/rust/pull/38368
7166 [38584]: https://github.com/rust-lang/rust/issues/38584
7167 [38661]: https://github.com/rust-lang/rust/pull/38661
7168 [38764]: https://github.com/rust-lang/rust/pull/38764
7169 [38864]: https://github.com/rust-lang/rust/issues/38864
7170 [38897]: https://github.com/rust-lang/rust/pull/38897
7171 [38921]: https://github.com/rust-lang/rust/pull/38921
7172 [38932]: https://github.com/rust-lang/rust/pull/38932
7173 [38945]: https://github.com/rust-lang/rust/pull/38945
7174 [38981]: https://github.com/rust-lang/rust/pull/38981
7175 [39002]: https://github.com/rust-lang/rust/pull/39002
7176 [39116]: https://github.com/rust-lang/rust/pull/39116
7177 [39193]: https://github.com/rust-lang/rust/pull/39193
7178 [39265]: https://github.com/rust-lang/rust/pull/39265
7179 [39356]: https://github.com/rust-lang/rust/pull/39356
7180 [39372]: https://github.com/rust-lang/rust/pull/39372
7181 [39426]: https://github.com/rust-lang/rust/pull/39426
7182 [39431]: https://github.com/rust-lang/rust/pull/39431
7183 [39438]: https://github.com/rust-lang/rust/pull/39438
7184 [39440]: https://github.com/rust-lang/rust/pull/39440
7185 [39485]: https://github.com/rust-lang/rust/pull/39485
7186 [39491]: https://github.com/rust-lang/rust/pull/39491
7187 [39518]: https://github.com/rust-lang/rust/pull/39518
7188 [39538]: https://github.com/rust-lang/rust/pull/39538
7189 [39572]: https://github.com/rust-lang/rust/pull/39572
7190 [39633]: https://github.com/rust-lang/rust/pull/39633
7191 [39642]: https://github.com/rust-lang/rust/pull/39642
7192 [39728]: https://github.com/rust-lang/rust/pull/39728
7193 [39761]: https://github.com/rust-lang/rust/pull/39761
7194 [39788]: https://github.com/rust-lang/rust/pull/39788
7195 [39793]: https://github.com/rust-lang/rust/pull/39793
7196 [39837]: https://github.com/rust-lang/rust/pull/39837
7197 [39843]: https://github.com/rust-lang/rust/pull/39843
7198 [39851]: https://github.com/rust-lang/rust/pull/39851
7199 [39903]: https://github.com/rust-lang/rust/pull/39903
7200 [39939]: https://github.com/rust-lang/rust/pull/39939
7201 [39953]: https://github.com/rust-lang/rust/pull/39953
7202 [39960]: https://github.com/rust-lang/rust/pull/39960
7203 [39990]: https://github.com/rust-lang/rust/pull/39990
7204 [39995]: https://github.com/rust-lang/rust/pull/39995
7205 [40008]: https://github.com/rust-lang/rust/pull/40008
7206 [40009]: https://github.com/rust-lang/rust/pull/40009
7207 [40027]: https://github.com/rust-lang/rust/pull/40027
7208 [40028]: https://github.com/rust-lang/rust/pull/40028
7209 [40037]: https://github.com/rust-lang/rust/pull/40037
7210 [40117]: https://github.com/rust-lang/rust/pull/40117
7211 [40166]: https://github.com/rust-lang/rust/pull/40166
7212 [40245]: https://github.com/rust-lang/rust/pull/40245
7213 [40257]: https://github.com/rust-lang/rust/pull/40257
7214 [40261]: https://github.com/rust-lang/rust/pull/40261
7215 [40265]: https://github.com/rust-lang/rust/pull/40265
7216 [40319]: https://github.com/rust-lang/rust/pull/40319
7217 [40336]: https://github.com/rust-lang/rust/pull/40336
7218 [40526]: https://github.com/rust-lang/rust/pull/40526
7219 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
7220 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
7221 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
7222 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
7223 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
7224 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
7225 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
7226 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
7227 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
7228 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
7229 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
7230 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
7231 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
7232 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
7233 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
7234 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
7235 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
7236 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
7237 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
7238 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
7239 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
7240 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
7241 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
7242 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
7243 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
7244 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
7245 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
7246 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
7247 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
7248 [ubook]: https://doc.rust-lang.org/unstable-book/
7251 Version 1.16.0 (2017-03-16)
7252 ===========================
7257 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7258 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7259 match patterns][38069]
7260 * [Clean up semantics of `self` in an import list][38313]
7261 * [`Self` may appear in `impl` headers][38920]
7262 * [`Self` may appear in struct expressions][39282]
7267 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
7268 a `.rmeta` file containing only crate metadata][38571]. This can be
7269 used by tools like the Rust Language Service to perform
7270 metadata-only builds.
7271 * [Levenshtein based typo suggestions now work in most places, while
7272 previously they worked only for fields and sometimes for local
7273 variables][38927]. Together with the overhaul of "no
7274 resolution"/"unexpected resolution" errors (#[38154]) they result in
7275 large and systematic improvement in resolution diagnostics.
7276 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
7278 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
7279 * [`rustc` no longer attempts to provide "consider using an explicit
7280 lifetime" suggestions][37057]. They were inaccurate.
7285 * [`VecDeque::truncate`]
7286 * [`VecDeque::resize`]
7287 * [`String::insert_str`]
7288 * [`Duration::checked_add`]
7289 * [`Duration::checked_sub`]
7290 * [`Duration::checked_div`]
7291 * [`Duration::checked_mul`]
7294 * [`SocketAddr::is_ipv4`]
7295 * [`SocketAddr::is_ipv6`]
7296 * [`IpAddr::is_ipv4`]
7297 * [`IpAddr::is_ipv6`]
7299 * [`Vec::dedup_by_key`]
7300 * [`Result::unwrap_or_default`]
7301 * [`<*const T>::wrapping_offset`]
7302 * [`<*mut T>::wrapping_offset`]
7303 * `CommandExt::creation_flags`
7304 * [`File::set_permissions`]
7305 * [`String::split_off`]
7310 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
7311 their argument by `Borrow` parameter][37761]
7312 * [All public types in std implement `Debug`][38006]
7313 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
7314 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
7315 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7317 * [std: Fix partial writes in `LineWriter`][38062]
7318 * [std: Clamp max read/write sizes on Unix][38622]
7319 * [Use more specific panic message for `&str` slicing errors][38066]
7320 * [`TcpListener::set_only_v6` is deprecated][38304]. This
7321 functionality cannot be achieved in std currently.
7322 * [`writeln!`, like `println!`, now accepts a form with no string
7323 or formatting arguments, to just print a newline][38469]
7324 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
7325 * [Reduce the size of static data in `std_unicode::tables`][38781]
7326 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
7327 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
7329 * [`Duration` implements `Sum`][38712]
7330 * [`String` implements `ToSocketAddrs`][39048]
7335 * [The `cargo check` command does a type check of a project without
7336 building it][cargo/3296]
7337 * [crates.io will display CI badges from Travis and AppVeyor, if
7338 specified in Cargo.toml][cargo/3546]
7339 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7340 * [Compilation profiles accept integer values for `debug`, in addition
7341 to `true` and `false`. These are passed to `rustc` as the value to
7342 `-C debuginfo`][cargo/3534]
7343 * [Implement `cargo --version --verbose`][cargo/3604]
7344 * [All builds now output 'dep-info' build dependencies compatible with
7345 make and ninja][cargo/3557]
7346 * [Build all workspace members with `build --all`][cargo/3511]
7347 * [Document all workspace members with `doc --all`][cargo/3515]
7348 * [Path deps outside workspace are not members][cargo/3443]
7353 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7354 the path to the Rust implementation][38589]
7355 * [The `armv7-linux-androideabi` target no longer enables NEON
7356 extensions, per Google's ABI guide][38413]
7357 * [The stock standard library can be compiled for Redox OS][38401]
7358 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7360 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7362 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7367 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7368 match patterns][38069]
7369 * In this release, references to uninhabited types can not be
7370 pattern-matched. This was accidentally allowed in 1.15.
7371 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7372 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7374 * [Clean up semantics of `self` in an import list][38313]
7375 * Reimplemented lifetime elision. This change was almost entirely compatible
7376 with existing code, but it did close a number of small bugs and loopholes,
7377 as well as being more accepting in some other [cases][41105].
7379 [37057]: https://github.com/rust-lang/rust/pull/37057
7380 [37761]: https://github.com/rust-lang/rust/pull/37761
7381 [38006]: https://github.com/rust-lang/rust/pull/38006
7382 [38051]: https://github.com/rust-lang/rust/pull/38051
7383 [38062]: https://github.com/rust-lang/rust/pull/38062
7384 [38622]: https://github.com/rust-lang/rust/pull/38622
7385 [38066]: https://github.com/rust-lang/rust/pull/38066
7386 [38069]: https://github.com/rust-lang/rust/pull/38069
7387 [38131]: https://github.com/rust-lang/rust/pull/38131
7388 [38154]: https://github.com/rust-lang/rust/pull/38154
7389 [38274]: https://github.com/rust-lang/rust/pull/38274
7390 [38304]: https://github.com/rust-lang/rust/pull/38304
7391 [38313]: https://github.com/rust-lang/rust/pull/38313
7392 [38327]: https://github.com/rust-lang/rust/pull/38327
7393 [38401]: https://github.com/rust-lang/rust/pull/38401
7394 [38413]: https://github.com/rust-lang/rust/pull/38413
7395 [38469]: https://github.com/rust-lang/rust/pull/38469
7396 [38559]: https://github.com/rust-lang/rust/pull/38559
7397 [38571]: https://github.com/rust-lang/rust/pull/38571
7398 [38580]: https://github.com/rust-lang/rust/pull/38580
7399 [38589]: https://github.com/rust-lang/rust/pull/38589
7400 [38670]: https://github.com/rust-lang/rust/pull/38670
7401 [38712]: https://github.com/rust-lang/rust/pull/38712
7402 [38726]: https://github.com/rust-lang/rust/pull/38726
7403 [38781]: https://github.com/rust-lang/rust/pull/38781
7404 [38798]: https://github.com/rust-lang/rust/pull/38798
7405 [38909]: https://github.com/rust-lang/rust/pull/38909
7406 [38920]: https://github.com/rust-lang/rust/pull/38920
7407 [38927]: https://github.com/rust-lang/rust/pull/38927
7408 [39048]: https://github.com/rust-lang/rust/pull/39048
7409 [39282]: https://github.com/rust-lang/rust/pull/39282
7410 [39379]: https://github.com/rust-lang/rust/pull/39379
7411 [41105]: https://github.com/rust-lang/rust/issues/41105
7412 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7413 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7414 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7415 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7416 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7417 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7418 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7419 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7420 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7421 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7422 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7423 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7424 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7425 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7426 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7427 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7428 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7429 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7430 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7431 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7432 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7433 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7434 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7435 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7436 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7437 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7438 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7439 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7440 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7443 Version 1.15.1 (2017-02-09)
7444 ===========================
7446 * [Fix IntoIter::as_mut_slice's signature][39466]
7447 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7449 [39466]: https://github.com/rust-lang/rust/pull/39466
7450 [39523]: https://github.com/rust-lang/rust/pull/39523
7453 Version 1.15.0 (2017-02-02)
7454 ===========================
7459 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7460 stable. This allows popular code-generating crates like Serde and Diesel to
7461 work ergonomically. [RFC 1681].
7462 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7463 with curly braces][36868]. Part of [RFC 1506].
7464 * [A number of minor changes to name resolution have been activated][37127].
7465 They add up to more consistent semantics, allowing for future evolution of
7466 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7467 details of what is different. The breaking changes here have been transitioned
7468 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7469 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7471 * [`?Sized` can be used in `where` clauses][37791]
7472 * [There is now a limit on the size of monomorphized types and it can be
7473 modified with the `#![type_size_limit]` crate attribute, similarly to
7474 the `#![recursion_limit]` attribute][37789]
7479 * [On Windows, the compiler will apply dllimport attributes when linking to
7480 extern functions][37973]. Additional attributes and flags can control which
7481 library kind is linked and its name. [RFC 1717].
7482 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7483 * [The `--test` flag works with procedural macro crates][38107]
7484 * [Fix `extern "aapcs" fn` ABI][37814]
7485 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7486 * [The `format!` expander recognizes incorrect `printf` and shell-style
7487 formatting directives and suggests the correct format][37613].
7488 * [Only report one error for all unused imports in an import list][37456]
7490 Compiler Performance
7491 --------------------
7493 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7494 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7495 * [Don't clone in `UnificationTable::probe`][37848]
7496 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7497 * [Use small vectors in type walker][37760]
7498 * [Macro expansion performance was improved][37701]
7499 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7500 * [Replace FNV with a faster hash function][37229]
7505 * [`std::iter::Iterator::min_by`]
7506 * [`std::iter::Iterator::max_by`]
7507 * [`std::os::*::fs::FileExt`]
7508 * [`std::sync::atomic::Atomic*::get_mut`]
7509 * [`std::sync::atomic::Atomic*::into_inner`]
7510 * [`std::vec::IntoIter::as_slice`]
7511 * [`std::vec::IntoIter::as_mut_slice`]
7512 * [`std::sync::mpsc::Receiver::try_iter`]
7513 * [`std::os::unix::process::CommandExt::before_exec`]
7514 * [`std::rc::Rc::strong_count`]
7515 * [`std::rc::Rc::weak_count`]
7516 * [`std::sync::Arc::strong_count`]
7517 * [`std::sync::Arc::weak_count`]
7518 * [`std::char::encode_utf8`]
7519 * [`std::char::encode_utf16`]
7520 * [`std::cell::Ref::clone`]
7521 * [`std::io::Take::into_inner`]
7526 * [The standard sorting algorithm has been rewritten for dramatic performance
7527 improvements][38192]. It is a hybrid merge sort, drawing influences from
7528 Timsort. Previously it was a naive merge sort.
7529 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7530 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7532 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7533 and `char_indices().last()`][37882]
7534 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7535 * [Chinese characters display correctly in `fmt::Debug`][37855]
7536 * [Derive `Default` for `Duration`][37699]
7537 * [Support creation of anonymous pipes on WinXP/2k][37677]
7538 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7539 * [Don't pass overlapped handles to processes][38835]
7544 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7545 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7546 should instead check the variable at runtime with `std::env`. That the value
7547 was set at build time was a bug, and incorrect when cross-compiling. This
7548 change is known to cause breakage.
7549 * [Add `--all` flag to `cargo test`][cargo/3221]
7550 * [Compile statically against the MSVC CRT][cargo/3363]
7551 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7552 * [Link OpenSSL statically on OSX][cargo/3311]
7553 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7554 * [Test for bad path overrides with summaries][cargo/3336]
7555 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7556 * [Fix retrying crate downloads for network errors][cargo/3348]
7557 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7558 * [Emit more info on --message-format=json][cargo/3319]
7559 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7560 * [Don't ignore errors in workspace manifest][cargo/3409]
7561 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7566 * [Test runners (binaries built with `--test`) now support a `--list` argument
7567 that lists the tests it contains][38185]
7568 * [Test runners now support a `--exact` argument that makes the test filter
7569 match exactly, instead of matching only a substring of the test name][38181]
7570 * [rustdoc supports a `--playground-url` flag][37763]
7571 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7576 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7577 continue to be used in this release by passing `--disable-rustbuild` to the
7578 configure script, but they will be deleted soon. Note that the new build
7579 system uses a different on-disk layout that will likely affect any scripts
7581 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7583 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7584 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7590 * [A number of minor changes to name resolution have been activated][37127].
7591 They add up to more consistent semantics, allowing for future evolution of
7592 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7593 details of what is different. The breaking changes here have been transitioned
7594 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7595 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7596 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7597 should instead check the variable at runtime with `std::env`. That the value
7598 was set at build time was a bug, and incorrect when cross-compiling. This
7599 change is known to cause breakage.
7600 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7601 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7602 1.10 and is now an error by default. It will become a hard error in the near
7604 * [The semantics relating modules to file system directories are changing in
7605 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7606 lint, which is a warning in this release, and will become a hard error in the
7608 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7609 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7610 the underlying iterator][37834]
7612 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7613 [33685]: https://github.com/rust-lang/rust/issues/33685
7614 [36868]: https://github.com/rust-lang/rust/pull/36868
7615 [37127]: https://github.com/rust-lang/rust/pull/37127
7616 [37229]: https://github.com/rust-lang/rust/pull/37229
7617 [37456]: https://github.com/rust-lang/rust/pull/37456
7618 [37527]: https://github.com/rust-lang/rust/pull/37527
7619 [37602]: https://github.com/rust-lang/rust/pull/37602
7620 [37613]: https://github.com/rust-lang/rust/pull/37613
7621 [37615]: https://github.com/rust-lang/rust/pull/37615
7622 [37636]: https://github.com/rust-lang/rust/pull/37636
7623 [37627]: https://github.com/rust-lang/rust/pull/37627
7624 [37642]: https://github.com/rust-lang/rust/pull/37642
7625 [37677]: https://github.com/rust-lang/rust/pull/37677
7626 [37699]: https://github.com/rust-lang/rust/pull/37699
7627 [37701]: https://github.com/rust-lang/rust/pull/37701
7628 [37705]: https://github.com/rust-lang/rust/pull/37705
7629 [37749]: https://github.com/rust-lang/rust/pull/37749
7630 [37760]: https://github.com/rust-lang/rust/pull/37760
7631 [37763]: https://github.com/rust-lang/rust/pull/37763
7632 [37764]: https://github.com/rust-lang/rust/pull/37764
7633 [37789]: https://github.com/rust-lang/rust/pull/37789
7634 [37791]: https://github.com/rust-lang/rust/pull/37791
7635 [37814]: https://github.com/rust-lang/rust/pull/37814
7636 [37817]: https://github.com/rust-lang/rust/pull/37817
7637 [37834]: https://github.com/rust-lang/rust/pull/37834
7638 [37848]: https://github.com/rust-lang/rust/pull/37848
7639 [37855]: https://github.com/rust-lang/rust/pull/37855
7640 [37882]: https://github.com/rust-lang/rust/pull/37882
7641 [37888]: https://github.com/rust-lang/rust/pull/37888
7642 [37973]: https://github.com/rust-lang/rust/pull/37973
7643 [37979]: https://github.com/rust-lang/rust/pull/37979
7644 [38086]: https://github.com/rust-lang/rust/pull/38086
7645 [38107]: https://github.com/rust-lang/rust/pull/38107
7646 [38117]: https://github.com/rust-lang/rust/pull/38117
7647 [38134]: https://github.com/rust-lang/rust/pull/38134
7648 [38146]: https://github.com/rust-lang/rust/pull/38146
7649 [38181]: https://github.com/rust-lang/rust/pull/38181
7650 [38182]: https://github.com/rust-lang/rust/pull/38182
7651 [38185]: https://github.com/rust-lang/rust/pull/38185
7652 [38192]: https://github.com/rust-lang/rust/pull/38192
7653 [38279]: https://github.com/rust-lang/rust/pull/38279
7654 [38835]: https://github.com/rust-lang/rust/pull/38835
7655 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7656 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7657 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7658 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7659 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7660 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7661 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7662 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7663 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7664 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7665 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7666 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7667 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7668 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7669 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7670 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7671 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7672 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7673 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7674 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7675 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7676 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7677 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7678 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7679 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7680 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7681 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7682 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7683 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7684 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7685 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7686 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7687 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7688 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7689 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7690 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7691 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7694 Version 1.14.0 (2016-12-22)
7695 ===========================
7700 * [`..` matches multiple tuple fields in enum variants, structs
7701 and tuples][36843]. [RFC 1492].
7702 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7703 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7704 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7705 dereferencing][36822]
7710 * [Mark enums with non-zero discriminant as non-zero][37224]
7711 * [Lower-case `static mut` names are linted like other
7712 statics and consts][37162]
7713 * [Fix ICE on some macros in const integer positions
7714 (e.g. `[u8; m!()]`)][36819]
7715 * [Improve error message and snippet for "did you mean `x`"][36798]
7716 * [Add a panic-strategy field to the target specification][36794]
7717 * [Include LLVM version in `--version --verbose`][37200]
7719 Compile-time Optimizations
7720 --------------------------
7722 * [Improve macro expansion performance][37569]
7723 * [Shrink `Expr_::ExprInlineAsm`][37445]
7724 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7725 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7726 * [Avoid more allocations when compiling html5ever][37373]
7727 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7728 * [Avoid some allocations in the macro parser][37318]
7729 * [Use a faster deflate setting][37298]
7730 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7731 during interning of slices][37270]
7732 * [Optimize `write_metadata`][37267]
7733 * [Don't process obligation forest cycles when stalled][37231]
7734 * [Avoid many `CrateConfig` clones][37161]
7735 * [Optimize `Substs::super_fold_with`][37108]
7736 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7737 * [Speed up `plug_leaks`][36917]
7742 * [`println!()`, with no arguments, prints newline][36825].
7743 Previously, an empty string was required to achieve the same.
7744 * [`Wrapping` impls standard binary and unary operators, as well as
7745 the `Sum` and `Product` iterators][37356]
7746 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7748 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7749 `VecDeque` iterators][37315]
7750 * [Improve `SipHasher` performance on small values][37312]
7751 * [Add Iterator trait TrustedLen to enable better FromIterator /
7753 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7754 * [`ReadDir` implements `Debug`][37221]
7755 * [Implement `RefUnwindSafe` for atomic types][37178]
7756 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7757 * [Avoid allocations in `Decoder::read_str`][37064]
7758 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7759 * [Impl `Debug` for raw pointers to unsized data][36880]
7760 * [Don't reuse `HashMap` random seeds][37470]
7761 * [The internal memory layout of `HashMap` is more cache-friendly, for
7762 significant improvements in some operations][36692]
7763 * [`HashMap` uses less memory on 32-bit architectures][36595]
7764 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7769 * [Expose rustc cfg values to build scripts][cargo/3243]
7770 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7771 * [Fix passing --features when testing multiple packages][cargo/3280]
7772 * [Use a single profile set per workspace][cargo/3249]
7773 * [Load `replace` sections from lock files][cargo/3220]
7774 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7779 * [rustup is the recommended Rust installation method][1.14rustup]
7780 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7781 S390x. These are [tier 2] platforms and may have major defects. Follow the
7782 instructions on the website to install, or add the targets to an existing
7783 installation with `rustup target add`. The new target triples are:
7784 - `mips-unknown-linux-gnu`
7785 - `mipsel-unknown-linux-gnu`
7786 - `mips64-unknown-linux-gnuabi64`
7787 - `mips64el-unknown-linux-gnuabi64 `
7788 - `powerpc-unknown-linux-gnu`
7789 - `powerpc64-unknown-linux-gnu`
7790 - `powerpc64le-unknown-linux-gnu`
7791 - `s390x-unknown-linux-gnu `
7792 * This release includes target (std) builds for ARM Linux running MUSL
7793 libc. These are [tier 2] platforms and may have major defects. Add the
7794 following triples to an existing rustup installation with `rustup target add`:
7795 - `arm-unknown-linux-musleabi`
7796 - `arm-unknown-linux-musleabihf`
7797 - `armv7-unknown-linux-musleabihf`
7798 * This release includes [experimental support for WebAssembly][1.14wasm], via
7799 the `wasm32-unknown-emscripten` target. This target is known to have major
7800 defects. Please test, report, and fix.
7801 * rustup no longer installs documentation by default. Run `rustup
7802 component add rust-docs` to install.
7803 * [Fix line stepping in debugger][37310]
7804 * [Enable line number debuginfo in releases][37280]
7809 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7810 * [Add support for Fuchsia OS][37313]
7811 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7816 * [A number of forward-compatibility lints used by the compiler
7817 to gradually introduce language changes have been converted
7818 to deny by default][36894]:
7819 - ["use of inaccessible extern crate erroneously allowed"][36886]
7820 - ["type parameter default erroneously allowed in invalid location"][36887]
7821 - ["detects super or self keywords at the beginning of global path"][36888]
7822 - ["two overlapping inherent impls define an item with the same name
7823 were erroneously allowed"][36889]
7824 - ["floating-point constants cannot be used in patterns"][36890]
7825 - ["constants of struct or enum type can only be used in a pattern if
7826 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7827 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7828 * [Prohibit patterns in trait methods without bodies][37378]
7829 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7830 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7831 * [The `$crate` macro variable is accepted in fewer locations][37213]
7832 * [Impls specifying extra region requirements beyond the trait
7833 they implement are rejected][37167]
7834 * [Enums may not be unsized][37111]. Unsized enums are intended to
7835 work but never have. For now they are forbidden.
7836 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7838 [tier 2]: https://forge.rust-lang.org/platform-support.html
7839 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7840 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7841 [36430]: https://github.com/rust-lang/rust/pull/36430
7842 [36595]: https://github.com/rust-lang/rust/pull/36595
7843 [36692]: https://github.com/rust-lang/rust/pull/36692
7844 [36767]: https://github.com/rust-lang/rust/pull/36767
7845 [36794]: https://github.com/rust-lang/rust/pull/36794
7846 [36798]: https://github.com/rust-lang/rust/pull/36798
7847 [36819]: https://github.com/rust-lang/rust/pull/36819
7848 [36822]: https://github.com/rust-lang/rust/pull/36822
7849 [36825]: https://github.com/rust-lang/rust/pull/36825
7850 [36843]: https://github.com/rust-lang/rust/pull/36843
7851 [36880]: https://github.com/rust-lang/rust/pull/36880
7852 [36886]: https://github.com/rust-lang/rust/issues/36886
7853 [36887]: https://github.com/rust-lang/rust/issues/36887
7854 [36888]: https://github.com/rust-lang/rust/issues/36888
7855 [36889]: https://github.com/rust-lang/rust/issues/36889
7856 [36890]: https://github.com/rust-lang/rust/issues/36890
7857 [36891]: https://github.com/rust-lang/rust/issues/36891
7858 [36892]: https://github.com/rust-lang/rust/issues/36892
7859 [36894]: https://github.com/rust-lang/rust/pull/36894
7860 [36917]: https://github.com/rust-lang/rust/pull/36917
7861 [36993]: https://github.com/rust-lang/rust/pull/36993
7862 [37037]: https://github.com/rust-lang/rust/pull/37037
7863 [37064]: https://github.com/rust-lang/rust/pull/37064
7864 [37094]: https://github.com/rust-lang/rust/pull/37094
7865 [37108]: https://github.com/rust-lang/rust/pull/37108
7866 [37111]: https://github.com/rust-lang/rust/pull/37111
7867 [37161]: https://github.com/rust-lang/rust/pull/37161
7868 [37162]: https://github.com/rust-lang/rust/pull/37162
7869 [37167]: https://github.com/rust-lang/rust/pull/37167
7870 [37178]: https://github.com/rust-lang/rust/pull/37178
7871 [37200]: https://github.com/rust-lang/rust/pull/37200
7872 [37213]: https://github.com/rust-lang/rust/pull/37213
7873 [37221]: https://github.com/rust-lang/rust/pull/37221
7874 [37224]: https://github.com/rust-lang/rust/pull/37224
7875 [37230]: https://github.com/rust-lang/rust/pull/37230
7876 [37231]: https://github.com/rust-lang/rust/pull/37231
7877 [37247]: https://github.com/rust-lang/rust/pull/37247
7878 [37267]: https://github.com/rust-lang/rust/pull/37267
7879 [37270]: https://github.com/rust-lang/rust/pull/37270
7880 [37273]: https://github.com/rust-lang/rust/pull/37273
7881 [37280]: https://github.com/rust-lang/rust/pull/37280
7882 [37298]: https://github.com/rust-lang/rust/pull/37298
7883 [37306]: https://github.com/rust-lang/rust/pull/37306
7884 [37310]: https://github.com/rust-lang/rust/pull/37310
7885 [37312]: https://github.com/rust-lang/rust/pull/37312
7886 [37313]: https://github.com/rust-lang/rust/pull/37313
7887 [37315]: https://github.com/rust-lang/rust/pull/37315
7888 [37318]: https://github.com/rust-lang/rust/pull/37318
7889 [37322]: https://github.com/rust-lang/rust/pull/37322
7890 [37326]: https://github.com/rust-lang/rust/pull/37326
7891 [37351]: https://github.com/rust-lang/rust/pull/37351
7892 [37356]: https://github.com/rust-lang/rust/pull/37356
7893 [37367]: https://github.com/rust-lang/rust/pull/37367
7894 [37373]: https://github.com/rust-lang/rust/pull/37373
7895 [37378]: https://github.com/rust-lang/rust/pull/37378
7896 [37389]: https://github.com/rust-lang/rust/pull/37389
7897 [37392]: https://github.com/rust-lang/rust/pull/37392
7898 [37427]: https://github.com/rust-lang/rust/pull/37427
7899 [37439]: https://github.com/rust-lang/rust/pull/37439
7900 [37445]: https://github.com/rust-lang/rust/pull/37445
7901 [37470]: https://github.com/rust-lang/rust/pull/37470
7902 [37569]: https://github.com/rust-lang/rust/pull/37569
7903 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7904 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7905 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7906 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7907 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7908 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7909 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7912 Version 1.13.0 (2016-11-10)
7913 ===========================
7918 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7919 errors, like the `try!` macro, described in [RFC 0243].
7920 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7921 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7922 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7923 * [Fix lifetime rules for 'if' conditions][36029]
7924 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7929 * [Add the `-C link-arg` argument][36574]
7930 * [Remove the old AST-based backend from rustc_trans][35764]
7931 * [Don't enable NEON by default on armv7 Linux][35814]
7932 * [Fix debug line number info for macro expansions][35238]
7933 * [Do not emit "class method" debuginfo for types that are not
7934 DICompositeType][36008]
7935 * [Warn about multiple conflicting #[repr] hints][34623]
7936 * [When sizing DST, don't double-count nested struct prefixes][36351]
7937 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7938 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7939 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7940 * [Expand macros without recursing to avoid stack overflows][36214]
7945 * [Replace macro backtraces with labeled local uses][35702]
7946 * [Improve error message for misplaced doc comments][33922]
7947 * [Buffer unix and lock windows to prevent message interleaving][35975]
7948 * [Update lifetime errors to specifically note temporaries][36171]
7949 * [Special case a few colors for Windows][36178]
7950 * [Suggest `use self` when such an import resolves][36289]
7951 * [Be more specific when type parameter shadows primitive type][36338]
7952 * Many minor improvements
7954 Compile-time Optimizations
7955 --------------------------
7957 * [Compute and cache HIR hashes at beginning][35854]
7958 * [Don't hash types in loan paths][36004]
7959 * [Cache projections in trans][35761]
7960 * [Optimize the parser's last token handling][36527]
7961 * [Only instantiate #[inline] functions in codegen units referencing
7962 them][36524]. This leads to big improvements in cases where crates export
7963 define many inline functions without using them directly.
7964 * [Lazily allocate TypedArena's first chunk][36592]
7965 * [Don't allocate during default HashSet creation][36734]
7972 * [`overflowing_abs`]
7973 * [`RefCell::try_borrow`]
7974 * [`RefCell::try_borrow_mut`]
7979 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7980 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7982 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7983 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7984 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7985 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7986 * [Use arc4rand on FreeBSD][35884]
7987 * [memrchr: Correct aligned offset computation][35969]
7988 * [Improve Demangling of Rust Symbols][36059]
7989 * [Use monotonic time in condition variables][35048]
7990 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7991 * [Implement conversion traits for `char`][35755]
7992 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7993 * [Zero first byte of CString on drop][36264]
7994 * [Inherit overflow checks for sum and product][36372]
7995 * [Add missing Eq implementations][36423]
7996 * [Implement `Debug` for `DirEntry`][36631]
7997 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7999 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8000 * [Implement more traits for `std::io::ErrorKind`][35911]
8001 * [Optimize BinaryHeap bounds checking][36072]
8002 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
8003 `extend_with_element`][36355]
8004 * [Fix overflow checking in unsigned pow()][34942]
8009 * This release includes security fixes to both curl and OpenSSL.
8010 * [Fix transitive doctests when panic=abort][cargo/3021]
8011 * [Add --all-features flag to cargo][cargo/3038]
8012 * [Reject path-based dependencies in `cargo package`][cargo/3060]
8013 * [Don't parse the home directory more than once][cargo/3078]
8014 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
8015 * [Update OpenSSL to 1.0.2j][cargo/3121]
8016 * [Add license and license_file to cargo metadata output][cargo/3110]
8017 * [Make crates-io registry URL optional in config; ignore all changes to
8018 source.crates-io][cargo/3089]
8019 * [Don't download dependencies from other platforms][cargo/3123]
8020 * [Build transitive dev-dependencies when needed][cargo/3125]
8021 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
8022 * [Avoid updating registry when adding existing deps][cargo/3144]
8023 * [Warn about path overrides that won't work][cargo/3136]
8024 * [Use workspaces during `cargo install`][cargo/3146]
8025 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
8026 * [Add --message-format flag][cargo/3000]
8027 * [Pass target environment for rustdoc][cargo/3205]
8028 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
8029 * [Update curl and curl-sys][cargo/3241]
8030 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
8035 * [rustdoc: Add the `--sysroot` argument][36586]
8036 * [rustdoc: Fix a couple of issues with the search results][35655]
8037 * [rustdoc: remove the `!` from macro URLs and titles][35234]
8038 * [gdb: Fix pretty-printing special-cased Rust types][35585]
8039 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
8044 * [Remove unmaintained style guide][35124]
8045 * [Add s390x support][36369]
8046 * [Initial work at Haiku OS support][36727]
8047 * [Add mips-uclibc targets][35734]
8048 * [Crate-ify compiler-rt into compiler-builtins][35021]
8049 * [Add rustc version info (git hash + date) to dist tarball][36213]
8050 * Many documentation improvements
8055 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
8056 * [Deny (by default) transmuting from fn item types to pointer-sized
8057 types][34923]. Continuing the long transition to zero-sized fn items,
8059 * [Fix `#[derive]` for empty tuple structs/variants][35728].
8061 * [Issue deprecation warnings for safe accesses to extern statics][36173]
8062 * [Fix lifetime rules for 'if' conditions][36029].
8063 * [Inherit overflow checks for sum and product][36372].
8064 * [Forbid user-defined macros named "macro_rules"][36730].
8066 [33922]: https://github.com/rust-lang/rust/pull/33922
8067 [34623]: https://github.com/rust-lang/rust/pull/34623
8068 [34923]: https://github.com/rust-lang/rust/pull/34923
8069 [34942]: https://github.com/rust-lang/rust/pull/34942
8070 [35021]: https://github.com/rust-lang/rust/pull/35021
8071 [35048]: https://github.com/rust-lang/rust/pull/35048
8072 [35074]: https://github.com/rust-lang/rust/pull/35074
8073 [35124]: https://github.com/rust-lang/rust/pull/35124
8074 [35234]: https://github.com/rust-lang/rust/pull/35234
8075 [35238]: https://github.com/rust-lang/rust/pull/35238
8076 [35354]: https://github.com/rust-lang/rust/pull/35354
8077 [35559]: https://github.com/rust-lang/rust/pull/35559
8078 [35585]: https://github.com/rust-lang/rust/pull/35585
8079 [35627]: https://github.com/rust-lang/rust/pull/35627
8080 [35655]: https://github.com/rust-lang/rust/pull/35655
8081 [35702]: https://github.com/rust-lang/rust/pull/35702
8082 [35707]: https://github.com/rust-lang/rust/pull/35707
8083 [35728]: https://github.com/rust-lang/rust/pull/35728
8084 [35734]: https://github.com/rust-lang/rust/pull/35734
8085 [35755]: https://github.com/rust-lang/rust/pull/35755
8086 [35761]: https://github.com/rust-lang/rust/pull/35761
8087 [35764]: https://github.com/rust-lang/rust/pull/35764
8088 [35814]: https://github.com/rust-lang/rust/pull/35814
8089 [35854]: https://github.com/rust-lang/rust/pull/35854
8090 [35871]: https://github.com/rust-lang/rust/pull/35871
8091 [35884]: https://github.com/rust-lang/rust/pull/35884
8092 [35911]: https://github.com/rust-lang/rust/pull/35911
8093 [35969]: https://github.com/rust-lang/rust/pull/35969
8094 [35975]: https://github.com/rust-lang/rust/pull/35975
8095 [36004]: https://github.com/rust-lang/rust/pull/36004
8096 [36008]: https://github.com/rust-lang/rust/pull/36008
8097 [36014]: https://github.com/rust-lang/rust/pull/36014
8098 [36029]: https://github.com/rust-lang/rust/pull/36029
8099 [36059]: https://github.com/rust-lang/rust/pull/36059
8100 [36072]: https://github.com/rust-lang/rust/pull/36072
8101 [36101]: https://github.com/rust-lang/rust/pull/36101
8102 [36104]: https://github.com/rust-lang/rust/pull/36104
8103 [36171]: https://github.com/rust-lang/rust/pull/36171
8104 [36173]: https://github.com/rust-lang/rust/pull/36173
8105 [36178]: https://github.com/rust-lang/rust/pull/36178
8106 [36213]: https://github.com/rust-lang/rust/pull/36213
8107 [36214]: https://github.com/rust-lang/rust/pull/36214
8108 [36264]: https://github.com/rust-lang/rust/pull/36264
8109 [36266]: https://github.com/rust-lang/rust/pull/36266
8110 [36289]: https://github.com/rust-lang/rust/pull/36289
8111 [36338]: https://github.com/rust-lang/rust/pull/36338
8112 [36351]: https://github.com/rust-lang/rust/pull/36351
8113 [36355]: https://github.com/rust-lang/rust/pull/36355
8114 [36369]: https://github.com/rust-lang/rust/pull/36369
8115 [36372]: https://github.com/rust-lang/rust/pull/36372
8116 [36423]: https://github.com/rust-lang/rust/pull/36423
8117 [36482]: https://github.com/rust-lang/rust/pull/36482
8118 [36505]: https://github.com/rust-lang/rust/pull/36505
8119 [36524]: https://github.com/rust-lang/rust/pull/36524
8120 [36527]: https://github.com/rust-lang/rust/pull/36527
8121 [36551]: https://github.com/rust-lang/rust/pull/36551
8122 [36574]: https://github.com/rust-lang/rust/pull/36574
8123 [36586]: https://github.com/rust-lang/rust/pull/36586
8124 [36592]: https://github.com/rust-lang/rust/pull/36592
8125 [36631]: https://github.com/rust-lang/rust/pull/36631
8126 [36721]: https://github.com/rust-lang/rust/pull/36721
8127 [36727]: https://github.com/rust-lang/rust/pull/36727
8128 [36730]: https://github.com/rust-lang/rust/pull/36730
8129 [36734]: https://github.com/rust-lang/rust/pull/36734
8130 [36754]: https://github.com/rust-lang/rust/pull/36754
8131 [36995]: https://github.com/rust-lang/rust/pull/36995
8132 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
8133 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
8134 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
8135 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
8136 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
8137 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
8138 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
8139 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
8140 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
8141 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
8142 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
8143 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
8144 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
8145 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
8146 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
8147 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
8148 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
8149 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
8150 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
8151 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
8152 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
8153 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
8154 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
8155 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
8156 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
8157 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
8158 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
8159 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
8160 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
8161 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
8162 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
8163 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
8166 Version 1.12.1 (2016-10-20)
8167 ===========================
8172 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
8173 * [Confusion with double negation and booleans][36856]
8174 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
8175 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
8176 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
8177 * [Corrupted memory after updated to 1.12][36936]
8178 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
8179 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
8180 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
8182 [36381]: https://github.com/rust-lang/rust/issues/36381
8183 [36856]: https://github.com/rust-lang/rust/issues/36856
8184 [36875]: https://github.com/rust-lang/rust/issues/36875
8185 [36924]: https://github.com/rust-lang/rust/issues/36924
8186 [36926]: https://github.com/rust-lang/rust/issues/36926
8187 [36936]: https://github.com/rust-lang/rust/issues/36936
8188 [37026]: https://github.com/rust-lang/rust/issues/37026
8189 [37112]: https://github.com/rust-lang/rust/issues/37112
8190 [37153]: https://github.com/rust-lang/rust/issues/37153
8193 Version 1.12.0 (2016-09-29)
8194 ===========================
8199 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8200 This translation pass is far simpler than the previous AST->LLVM pass, and
8201 creates opportunities to perform new optimizations directly on the MIR. It
8202 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8203 * [`rustc` presents a new, more readable error format, along with
8204 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8205 Most common editors supporting Rust have been updated to work with it. It was
8206 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8211 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
8212 This translation pass is far simpler than the previous AST->LLVM pass, and
8213 creates opportunities to perform new optimizations directly on the MIR. It
8214 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
8215 * [Print the Rust target name, not the LLVM target name, with
8216 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
8217 * [The computation of `TypeId` is correct in some cases where it was previously
8218 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
8219 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
8220 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
8221 `--print relocation-models`, and `--print code-models` print the available
8222 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
8223 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
8224 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
8225 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
8226 These targets produce statically-linked binaries. There are no binary release
8232 * [`rustc` presents a new, more readable error format, along with
8233 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
8234 Most common editors supporting Rust have been updated to work with it. It was
8235 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
8236 * [In error descriptions, references are now described in plain English,
8237 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
8238 * [In error type descriptions, unknown numeric types are named `{integer}` or
8239 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
8240 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
8245 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
8246 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
8247 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
8248 useful](https://github.com/rust-lang/rust/pull/34908)
8249 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
8250 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
8251 * [Semicolons are properly required as statement delimiters inside
8252 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
8253 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
8258 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
8259 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
8260 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
8261 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
8262 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
8263 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
8264 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
8265 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
8266 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
8267 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
8268 Both on Unix and Windows.
8269 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
8270 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
8271 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
8272 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
8273 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
8274 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
8275 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
8276 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
8281 * [The `format!` macro and friends now allow a single argument to be formatted
8282 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
8283 * [The lifetime bounds on `[T]::binary_search_by` and
8284 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
8285 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
8286 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
8287 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
8288 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
8289 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
8290 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
8291 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
8292 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
8293 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
8294 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
8295 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
8296 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
8297 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
8298 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
8299 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
8300 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
8301 * [`mpsc::sync_channel` `Receiver`s return any available message before
8302 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
8303 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
8304 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
8309 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
8310 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
8311 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
8312 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
8313 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
8314 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
8315 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
8316 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
8317 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
8318 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
8319 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
8320 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
8321 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
8322 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
8323 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
8324 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
8329 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
8330 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
8335 * [Test binaries now support a `--test-threads` argument to specify the number
8336 of threads used to run tests, and which acts the same as the
8337 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
8338 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
8339 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8340 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8341 * [Rust releases now come with source packages that can be installed by rustup
8342 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8343 The resulting source code can be used by tools and IDES, located in the
8344 sysroot under `lib/rustlib/src`.
8349 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8350 * Many minor improvements to the documentation.
8351 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8356 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8357 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8358 * [When formatting strings, if "precision" is specified, the "fill",
8359 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8360 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8363 Version 1.11.0 (2016-08-18)
8364 ===========================
8369 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8370 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8371 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8372 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8377 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8378 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8379 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8380 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8381 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8382 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8383 (in libcore - previously stabilized in libstd)
8384 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8385 (in libcore - previously stabilized in libstd)
8386 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8387 (in libcore - previously stabilized in libstd)
8388 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8389 (in libcore - previously stabilized in libstd)
8390 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8391 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8392 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8393 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8398 * [The `thread_local!` macro supports multiple definitions in a single
8399 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8400 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8401 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8402 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8403 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8404 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8405 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8406 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8411 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8412 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8413 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8414 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8415 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8416 and `-vv` prints warnings for all crates.
8417 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8418 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8419 This provides room for expansion by arbitrary tools.
8420 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8421 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8422 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8423 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8424 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8425 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8426 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8431 * [Caching projections speeds up type check dramatically for some
8432 workloads](https://github.com/rust-lang/rust/pull/33816)
8433 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8434 This hasher is faster, but is believed to provide sufficient
8435 protection from collision attacks.
8436 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8441 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8442 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8443 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8444 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8445 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8450 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8451 * [When emitting debug info, rustc emits frame pointers for closures,
8452 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8453 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8454 * Many more errors have been given error codes and extended
8456 * API documentation continues to be improved, with many new examples
8461 * [rustc no longer hangs when dependencies recursively re-export
8462 submodules](https://github.com/rust-lang/rust/pull/34542)
8463 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8464 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8465 rewritten](https://github.com/rust-lang/rust/pull/33895)
8466 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8467 No targets use this yet, but it works toward AVR support.
8472 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8473 * [The new follow-set rules that place restrictions on `macro_rules!`
8474 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8475 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8476 and has been a warning since 1.10.
8477 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8478 This causes breakage in some corner cases.
8481 Version 1.10.0 (2016-07-07)
8482 ===========================
8487 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8488 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8489 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8490 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8491 * [`panic!` can be converted to a runtime abort with the
8492 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8493 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8494 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8495 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8496 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8497 Note that Cargo does not yet directly support cdylibs.
8502 * `os::windows::fs::OpenOptionsExt::access_mode`
8503 * `os::windows::fs::OpenOptionsExt::share_mode`
8504 * `os::windows::fs::OpenOptionsExt::custom_flags`
8505 * `os::windows::fs::OpenOptionsExt::attributes`
8506 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8507 * `os::unix::fs::OpenOptionsExt::custom_flags`
8508 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8509 * `Default for sync::Weak`
8510 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8511 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8512 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8513 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8514 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8515 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8516 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8517 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8518 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8519 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8520 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8521 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8522 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8523 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8524 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8525 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8526 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8527 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8528 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8529 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8530 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8531 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8532 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8533 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8534 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8535 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8536 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8537 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8538 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8539 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8540 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8541 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8542 * Read/Write/RawFd impls for `UnixStream`
8543 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8544 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8545 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8546 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8547 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8548 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8549 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8550 * RawFd impls for `UnixListener`
8551 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8552 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8553 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8554 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8555 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8556 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8557 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8558 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8559 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8560 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8561 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8562 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8563 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8564 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8565 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8566 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8567 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8568 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8569 * RawFd impls for `UnixDatagram`
8570 * `{BTree,Hash}Map::values_mut`
8571 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8576 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8577 The semantics of this minor method are subtle and probably not what
8579 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8580 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8581 will fall back to `/dev/urandom` temporarily to avoid blocking
8582 during early boot](https://github.com/rust-lang/rust/pull/33086).
8583 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8584 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8585 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8586 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8587 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8588 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8589 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8593 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8594 This controls the runtime behavior of the `panic!` macro
8595 and can be either "unwind" (the default), or "abort".
8596 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8597 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8598 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8599 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8600 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8601 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8602 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8603 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8604 By default they are retried twice, which can be customized with the
8605 `net.retry` value in `.cargo/config`.
8606 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8607 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8608 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8609 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8610 Makes it possible to install multiple crates in parallel.
8611 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8612 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8613 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8614 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8615 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8616 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8621 * [rustc memory usage was reduced by refactoring the context used for
8622 type checking](https://github.com/rust-lang/rust/pull/33425).
8623 * [Speed up creation of `HashMap`s by caching the random keys used
8624 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8625 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8626 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8627 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8628 10x faster than the previous lookup tables.
8629 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8634 * Many incremental improvements to documentation and rustdoc.
8635 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8636 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8637 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8638 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8639 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8640 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8641 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8646 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8647 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8648 * [`std` no longer prints backtraces on platforms where the running
8649 module must be loaded with `env::current_exe`, which can't be relied
8650 on](https://github.com/rust-lang/rust/pull/33554).
8651 * This release includes std binaries for the i586-unknown-linux-gnu,
8652 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8653 i586 target is for old x86 hardware without SSE2, and the armv7
8654 target is for Android running on modern ARM architectures.
8655 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8656 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8657 * [On Unix the runtime aborts by calling `libc::abort` instead of
8658 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8659 * [Rust is now bootstrapped from the previous release of Rust,
8660 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8665 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8666 * [`target_env` for Linux ARM targets is just `gnu`, not
8667 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8668 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8669 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8670 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8671 Affects how macros are parsed.
8672 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8673 * [Feature-gated attributes on macro-generated macro invocations are
8674 now rejected](https://github.com/rust-lang/rust/pull/32791).
8675 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8676 This caused some minor changes to type inference.
8679 Version 1.9.0 (2016-05-26)
8680 ==========================
8685 * The `#[deprecated]` attribute when applied to an API will generate
8686 warnings when used. The warnings may be suppressed with
8687 `#[allow(deprecated)]`. [RFC 1270].
8688 * [`fn` item types are zero sized, and each `fn` names a unique
8689 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8690 `transmute` on a `fn` type will generate a warning for a few cycles,
8691 then will be converted to an error.
8692 * [Field and method resolution understand visibility, so private
8693 fields and methods cannot prevent the proper use of public fields
8694 and methods][1.9fv].
8695 * [The parser considers unicode codepoints in the
8696 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8702 * [`std::panic::catch_unwind`] (renamed from `recover`)
8703 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8704 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8705 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8706 * [`str::is_char_boundary`]
8707 * [`<*const T>::as_ref`]
8708 * [`<*mut T>::as_ref`]
8709 * [`<*mut T>::as_mut`]
8710 * [`AsciiExt::make_ascii_uppercase`]
8711 * [`AsciiExt::make_ascii_lowercase`]
8712 * [`char::decode_utf16`]
8713 * [`char::DecodeUtf16`]
8714 * [`char::DecodeUtf16Error`]
8715 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8716 * [`BTreeSet::take`]
8717 * [`BTreeSet::replace`]
8720 * [`HashSet::replace`]
8722 * [`OsString::with_capacity`]
8723 * [`OsString::clear`]
8724 * [`OsString::capacity`]
8725 * [`OsString::reserve`]
8726 * [`OsString::reserve_exact`]
8727 * [`OsStr::is_empty`]
8729 * [`std::os::unix::thread`]
8732 * [`JoinHandleExt::as_pthread_t`]
8733 * [`JoinHandleExt::into_pthread_t`]
8734 * [`HashSet::hasher`]
8735 * [`HashMap::hasher`]
8736 * [`CommandExt::exec`]
8737 * [`File::try_clone`]
8738 * [`SocketAddr::set_ip`]
8739 * [`SocketAddr::set_port`]
8740 * [`SocketAddrV4::set_ip`]
8741 * [`SocketAddrV4::set_port`]
8742 * [`SocketAddrV6::set_ip`]
8743 * [`SocketAddrV6::set_port`]
8744 * [`SocketAddrV6::set_flowinfo`]
8745 * [`SocketAddrV6::set_scope_id`]
8746 * [`slice::copy_from_slice`]
8747 * [`ptr::read_volatile`]
8748 * [`ptr::write_volatile`]
8749 * [`OpenOptions::create_new`]
8750 * [`TcpStream::set_nodelay`]
8751 * [`TcpStream::nodelay`]
8752 * [`TcpStream::set_ttl`]
8753 * [`TcpStream::ttl`]
8754 * [`TcpStream::set_only_v6`]
8755 * [`TcpStream::only_v6`]
8756 * [`TcpStream::take_error`]
8757 * [`TcpStream::set_nonblocking`]
8758 * [`TcpListener::set_ttl`]
8759 * [`TcpListener::ttl`]
8760 * [`TcpListener::set_only_v6`]
8761 * [`TcpListener::only_v6`]
8762 * [`TcpListener::take_error`]
8763 * [`TcpListener::set_nonblocking`]
8764 * [`UdpSocket::set_broadcast`]
8765 * [`UdpSocket::broadcast`]
8766 * [`UdpSocket::set_multicast_loop_v4`]
8767 * [`UdpSocket::multicast_loop_v4`]
8768 * [`UdpSocket::set_multicast_ttl_v4`]
8769 * [`UdpSocket::multicast_ttl_v4`]
8770 * [`UdpSocket::set_multicast_loop_v6`]
8771 * [`UdpSocket::multicast_loop_v6`]
8772 * [`UdpSocket::set_multicast_ttl_v6`]
8773 * [`UdpSocket::multicast_ttl_v6`]
8774 * [`UdpSocket::set_ttl`]
8775 * [`UdpSocket::ttl`]
8776 * [`UdpSocket::set_only_v6`]
8777 * [`UdpSocket::only_v6`]
8778 * [`UdpSocket::join_multicast_v4`]
8779 * [`UdpSocket::join_multicast_v6`]
8780 * [`UdpSocket::leave_multicast_v4`]
8781 * [`UdpSocket::leave_multicast_v6`]
8782 * [`UdpSocket::take_error`]
8783 * [`UdpSocket::connect`]
8784 * [`UdpSocket::send`]
8785 * [`UdpSocket::recv`]
8786 * [`UdpSocket::set_nonblocking`]
8791 * [`std::sync::Once` is poisoned if its initialization function
8793 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8794 * [Most types implement `fmt::Debug`][1.9db].
8795 * [The default buffer size used by `BufReader` and `BufWriter` was
8796 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8797 used by other languages.
8798 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8799 `Duration` additionally implements `*=` and `/=`][1.9ta].
8800 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8801 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8802 * [`Chain` implements `BufRead`][1.9ch].
8803 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8808 * [Cargo can now run concurrently][1.9cc].
8809 * [Top-level overrides allow specific revisions of crates to be
8810 overridden through the entire crate graph][1.9ct]. This is intended
8811 to make upgrades easier for large projects, by allowing crates to be
8812 forked temporarily until they've been upgraded and republished.
8813 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8814 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8815 on the commandline][1.9cf]. `rustc` arguments can also be specified
8816 in the `build.rustflags` configuration key.
8821 * [The time complexity of comparing variables for equivalence during type
8822 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8823 to major compilation time improvement in some scenarios.
8824 * [`ToString` is specialized for `str`, giving it the same performance
8825 as `to_owned`][1.9ts].
8826 * [Spawning processes with `Command::output` no longer creates extra
8828 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8829 for C-like enums][1.9cl].
8834 * [Passing the `--quiet` flag to a test runner will produce
8835 much-abbreviated output][1.9q].
8836 * The Rust Project now publishes std binaries for the
8837 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8838 `i586-pc-windows-msvc` targets.
8843 * [`std::sync::Once` is poisoned if its initialization function
8845 * [It is illegal to define methods with the same name in overlapping
8846 inherent `impl` blocks][1.9sn].
8847 * [`fn` item types are zero sized, and each `fn` names a unique
8848 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8849 `transmute` on a `fn` type will generate a warning for a few cycles,
8850 then will be converted to an error.
8851 * [Improvements to const evaluation may trigger new errors when integer
8852 literals are out of range][1.9ce].
8855 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8856 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8857 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8858 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8859 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8860 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8861 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8862 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8863 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8864 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8865 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8866 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8867 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8868 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8869 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8870 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8871 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8872 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8873 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8874 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8875 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8876 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8877 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8878 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8879 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8880 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8881 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8882 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8883 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8884 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8885 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8886 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8887 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8888 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8889 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8890 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8891 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8892 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8893 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8894 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8895 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8896 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8897 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8898 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8899 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8900 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8901 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8902 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8903 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8904 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8905 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8906 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8907 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8908 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8909 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8910 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8911 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8912 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8913 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8914 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8915 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8916 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8917 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8918 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8919 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8920 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8921 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8922 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8923 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8924 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8925 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8926 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8927 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8928 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8929 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8930 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8931 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8932 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8933 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8934 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8935 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8936 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8937 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8938 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8939 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8940 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8941 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8942 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8943 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8944 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8945 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8946 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8947 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8948 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8949 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8950 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8951 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8952 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8953 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8954 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8955 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8956 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8957 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8958 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8959 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8960 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8961 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8962 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8963 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8964 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8967 Version 1.8.0 (2016-04-14)
8968 ==========================
8973 * Rust supports overloading of compound assignment statements like
8974 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8975 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8976 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8978 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8979 addition to the non-braced form, `struct Foo;`. [RFC 218].
8985 * [`str::encode_utf16`] (renamed from `utf16_units`)
8986 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8989 * [`ptr::drop_in_place`]
8991 * [`time::SystemTime`]
8993 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8994 * [`Instant::elapsed`]
8995 * [`SystemTime::now`]
8996 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8997 * [`SystemTime::elapsed`]
8998 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8999 * [`SystemTimeError`]
9000 * [`SystemTimeError::duration`]
9001 * Various impls for `SystemTimeError`
9003 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
9004 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
9005 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
9006 * [The `write!` and `writeln!` macros correctly emit errors if any of
9007 their arguments can't be formatted][1.8w].
9008 * [Various I/O functions support large files on 32-bit Linux][1.8l].
9009 * [The Unix-specific `raw` modules, which contain a number of
9010 redefined C types are deprecated][1.8r], including `os::raw::unix`,
9011 `os::raw::macos`, and `os::raw::linux`. These modules defined types
9012 such as `ino_t` and `dev_t`. The inconsistency of these definitions
9013 across platforms was making it difficult to implement `std`
9014 correctly. Those that need these definitions should use the `libc`
9016 * The Unix-specific `MetadataExt` traits, including
9017 `os::unix::fs::MetadataExt`, which expose values such as inode
9018 numbers [no longer return platform-specific types][1.8r], but
9019 instead return widened integers. [RFC 1415].
9020 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
9021 * [Atomic loads and stores are not volatile][1.8a].
9022 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
9027 * [Inlining hash functions lead to a 3% compile-time improvement in
9028 some workloads][1.8h].
9029 * When using jemalloc, its symbols are [unprefixed so that it
9030 overrides the libc malloc implementation][1.8h]. This means that for
9031 rustc, LLVM is now using jemalloc, which results in a 6%
9032 compile-time improvement on a specific workload.
9033 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
9038 * [32-bit MSVC builds finally implement unwinding][1.8ms].
9039 i686-pc-windows-msvc is now considered a tier-1 platform.
9040 * [The `--print targets` flag prints a list of supported targets][1.8t].
9041 * [The `--print cfg` flag prints the `cfg`s defined for the current
9043 * [`rustc` can be built with an new Cargo-based build system, written
9044 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
9045 build system. To enable it configure with `configure --rustbuild`.
9046 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
9047 variants while also indicating the total number of missing variants
9048 if more than 3][1.8m].
9049 * [Executable stacks are disabled on Linux and BSD][1.8nx].
9050 * The Rust Project now publishes binary releases of the standard
9051 library for a number of tier-2 targets:
9052 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
9053 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
9054 `x86_64-rumprun-netbsd`. These can be installed with
9055 tools such as [multirust][1.8mr].
9060 * [`cargo init` creates a new Cargo project in the current
9061 directory][1.8ci]. It is otherwise like `cargo new`.
9062 * [Cargo has configuration keys for `-v` and
9063 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
9064 `[term]` section of `.cargo/config`.
9065 * [Configuration keys that evaluate to strings or integers can be set
9066 via environment variables][1.8ce]. For example the `build.jobs` key
9067 can be set via `CARGO_BUILD_JOBS`. Environment variables take
9068 precedence over config files.
9069 * [Target-specific dependencies support Rust `cfg` syntax for
9070 describing targets][1.8cfg] so that dependencies for multiple
9071 targets can be specified together. [RFC 1361].
9072 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
9073 `RUSTDOC` take precedence over the `build.target-dir`,
9074 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
9075 * [The child process tree is killed on Windows when Cargo is
9077 * [The `build.target` configuration value sets the target platform,
9078 like `--target`][1.8ct].
9083 * [Unstable compiler flags have been further restricted][1.8u]. Since
9084 1.0 `-Z` flags have been considered unstable, and other flags that
9085 were considered unstable additionally required passing `-Z
9086 unstable-options` to access. Unlike unstable language and library
9087 features though, these options have been accessible on the stable
9088 release channel. Going forward, *new unstable flags will not be
9089 available on the stable release channel*, and old unstable flags
9090 will warn about their usage. In the future, all unstable flags will
9091 be unavailable on the stable release channel.
9092 * [It is no longer possible to `match` on empty enum variants using
9093 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
9094 * The Unix-specific `MetadataExt` traits, including
9095 `os::unix::fs::MetadataExt`, which expose values such as inode
9096 numbers [no longer return platform-specific types][1.8r], but
9097 instead return widened integers. [RFC 1415].
9098 * [Modules sourced from the filesystem cannot appear within arbitrary
9099 blocks, but only within other modules][1.8mf].
9100 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
9101 * On Unix, [stack overflow triggers a runtime abort instead of a
9103 * [`Command::spawn` and its equivalents return an error if any of
9104 its command-line arguments contain interior `NUL`s][1.8n].
9105 * [Tuple and unit enum variants from other crates are in the type
9107 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
9108 type instead of `.a` files][1.8st]. Additionally, for the MSVC
9109 toolchain, `rustc` emits import libraries named `foo.dll.lib`
9110 instead of `foo.lib`.
9113 [1.8a]: https://github.com/rust-lang/rust/pull/30962
9114 [1.8b]: https://github.com/rust-lang/rust/pull/31123
9115 [1.8c]: https://github.com/rust-lang/rust/pull/31530
9116 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
9117 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
9118 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
9119 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
9120 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
9121 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
9122 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
9123 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
9124 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
9125 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
9126 [1.8h]: https://github.com/rust-lang/rust/pull/31460
9127 [1.8l]: https://github.com/rust-lang/rust/pull/31668
9128 [1.8m]: https://github.com/rust-lang/rust/pull/31020
9129 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
9130 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
9131 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
9132 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
9133 [1.8n]: https://github.com/rust-lang/rust/pull/31056
9134 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
9135 [1.8r]: https://github.com/rust-lang/rust/pull/31551
9136 [1.8so]: https://github.com/rust-lang/rust/pull/31333
9137 [1.8st]: https://github.com/rust-lang/rust/pull/29520
9138 [1.8t]: https://github.com/rust-lang/rust/pull/31358
9139 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
9140 [1.8u]: https://github.com/rust-lang/rust/pull/31793
9141 [1.8v]: https://github.com/rust-lang/rust/pull/31757
9142 [1.8w]: https://github.com/rust-lang/rust/pull/31904
9143 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
9144 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
9145 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
9146 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
9147 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
9148 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
9149 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
9150 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
9151 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
9152 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
9153 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
9154 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
9155 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
9156 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
9157 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
9158 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
9159 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
9160 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
9161 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
9162 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
9163 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
9164 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
9165 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
9166 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
9167 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
9168 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
9169 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
9170 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
9171 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
9172 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
9175 Version 1.7.0 (2016-03-03)
9176 ==========================
9183 * [`Path::strip_prefix`] (renamed from relative_from)
9184 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9186 * [`Ipv4Addr::is_loopback`]
9187 * [`Ipv4Addr::is_private`]
9188 * [`Ipv4Addr::is_link_local`]
9189 * [`Ipv4Addr::is_multicast`]
9190 * [`Ipv4Addr::is_broadcast`]
9191 * [`Ipv4Addr::is_documentation`]
9193 * [`Ipv6Addr::is_unspecified`]
9194 * [`Ipv6Addr::is_loopback`]
9195 * [`Ipv6Addr::is_multicast`]
9198 * [`Vec::as_mut_slice`]
9200 * [`String::as_str`]
9201 * [`String::as_mut_str`]
9203 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
9205 * `<[T]>::`[`sort_by_key`]
9206 * checked, saturated, and overflowing operations
9207 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
9208 * [`i32::saturating_mul`]
9209 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
9210 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
9211 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
9212 * [`u32::saturating_mul`]
9213 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
9214 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
9215 * and checked, saturated, and overflowing operations for other primitive types
9217 * [`ffi::IntoStringError`]
9218 * [`CString::into_string`]
9219 * [`CString::into_bytes`]
9220 * [`CString::into_bytes_with_nul`]
9221 * `From<CString> for Vec<u8>`
9223 * [`IntoStringError::into_cstring`]
9224 * [`IntoStringError::utf8_error`]
9225 * `Error for IntoStringError`
9227 * [`std::hash::BuildHasher`]
9228 * [`BuildHasher::Hasher`]
9229 * [`BuildHasher::build_hasher`]
9230 * [`std::hash::BuildHasherDefault`]
9231 * [`HashMap::with_hasher`]
9232 * [`HashMap::with_capacity_and_hasher`]
9233 * [`HashSet::with_hasher`]
9234 * [`HashSet::with_capacity_and_hasher`]
9235 * [`std::collections::hash_map::RandomState`]
9236 * [`RandomState::new`]
9237 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
9238 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
9239 from bytes is faster.
9240 * [The performance of `LineWriter` (and thus `io::stdout`) was
9241 improved by using `memchr` to search for newlines][1.7m].
9242 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
9243 `f64` variants were stabilized previously.
9244 * [`BTreeMap` was rewritten to use less memory and improve the performance
9245 of insertion and iteration, the latter by as much as 5x][1.7bm].
9246 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
9247 covariant over their contained type][1.7bt].
9248 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
9249 over their contained type][1.7ll].
9250 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
9252 * [`Any` is implemented for unsized types][1.7a].
9253 * [`Hash` is implemented for `Duration`][1.7h].
9258 * [When running tests with `--test`, rustdoc will pass `--cfg`
9259 arguments to the compiler][1.7dt].
9260 * [The compiler is built with RPATH information by default][1.7rpa].
9261 This means that it will be possible to run `rustc` when installed in
9262 unusual configurations without configuring the dynamic linker search
9264 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
9265 any RPATH entries (emitted with `-C rpath`) *not* take precedence
9266 over `LD_LIBRARY_PATH`.
9271 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
9272 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
9273 * [The `rerun-if-changed` build script directive no longer causes the
9274 build script to incorrectly run twice in certain scenarios][1.7rr].
9279 * Soundness fixes to the interactions between associated types and
9280 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
9281 code that violates the new rules. This is a significant change that
9282 is known to break existing code, so it has emitted warnings for the
9283 new error cases since 1.4 to give crate authors time to adapt. The
9284 details of what is changing are subtle; read the RFC for more.
9285 * [Several bugs in the compiler's visibility calculations were
9286 fixed][1.7v]. Since this was found to break significant amounts of
9287 code, the new errors will be emitted as warnings for several release
9288 cycles, under the `private_in_public` lint.
9289 * Defaulted type parameters were accidentally accepted in positions
9290 that were not intended. In this release, [defaulted type parameters
9291 appearing outside of type definitions will generate a
9292 warning][1.7d], which will become an error in future releases.
9293 * [Parsing "." as a float results in an error instead of 0][1.7p].
9294 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
9295 * [Borrows of closure parameters may not outlive the closure][1.7bc].
9297 [1.7a]: https://github.com/rust-lang/rust/pull/30928
9298 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
9299 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
9300 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
9301 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
9302 [1.7d]: https://github.com/rust-lang/rust/pull/30724
9303 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
9304 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
9305 [1.7f]: https://github.com/rust-lang/rust/pull/30672
9306 [1.7h]: https://github.com/rust-lang/rust/pull/30818
9307 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
9308 [1.7m]: https://github.com/rust-lang/rust/pull/30381
9309 [1.7p]: https://github.com/rust-lang/rust/pull/30681
9310 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
9311 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
9312 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
9313 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
9314 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
9315 [1.7v]: https://github.com/rust-lang/rust/pull/29973
9316 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9317 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9318 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
9319 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
9320 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
9321 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
9322 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
9323 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
9324 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
9325 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
9326 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
9327 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
9328 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
9329 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
9330 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
9331 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
9332 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
9333 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
9334 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
9335 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
9336 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
9337 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
9338 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9339 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9340 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9341 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9342 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9343 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9344 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9345 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9346 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9347 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9348 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9349 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9350 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9351 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9352 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9353 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9354 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9355 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9356 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9357 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9358 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9359 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9360 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9361 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9362 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9363 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9364 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9365 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9366 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9367 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9368 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9369 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9370 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9371 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9372 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9373 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9374 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9375 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9378 Version 1.6.0 (2016-01-21)
9379 ==========================
9384 * The `#![no_std]` attribute causes a crate to not be linked to the
9385 standard library, but only the [core library][1.6co], as described
9386 in [RFC 1184]. The core library defines common types and traits but
9387 has no platform dependencies whatsoever, and is the basis for Rust
9388 software in environments that cannot support a full port of the
9389 standard library, such as operating systems. Most of the core
9390 library is now stable.
9396 [`Read::read_exact`],
9397 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9398 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9399 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9400 [`os::unix::fs::DirBuilderExt`],
9401 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9402 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9403 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9404 [`collections::hash_map::Drain`],
9405 [`collections::hash_map::HashMap::drain`],
9406 [`collections::hash_set::Drain`],
9407 [`collections::hash_set::HashSet::drain`],
9408 [`collections::binary_heap::Drain`],
9409 [`collections::binary_heap::BinaryHeap::drain`],
9410 [`Vec::extend_from_slice`] (renamed from `push_all`),
9411 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9412 [`RwLock::into_inner`],
9413 [`Iterator::min_by_key`] (renamed from `min_by`),
9414 [`Iterator::max_by_key`] (renamed from `max_by`).
9415 * The [core library][1.6co] is stable, as are most of its APIs.
9416 * [The `assert_eq!` macro supports arguments that don't implement
9417 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9419 * Several timer functions that take duration in milliseconds [are
9420 deprecated in favor of those that take `Duration`][1.6ms]. These
9421 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9422 `thread::park_timeout_ms`.
9423 * The algorithm by which `Vec` reserves additional elements was
9424 [tweaked to not allocate excessive space][1.6a] while still growing
9426 * `From` conversions are [implemented from integers to floats][1.6f]
9427 in cases where the conversion is lossless. Thus they are not
9428 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9429 or `f64`. They are also not implemented for `isize` and `usize`
9430 because the implementations would be platform-specific. `From` is
9431 also implemented from `f32` to `f64`.
9432 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9433 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9434 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9435 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9437 * Sorting slices that are already sorted [is 50% faster in some
9443 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9444 * Cargo build scripts can specify their dependencies by emitting the
9445 [`rerun-if-changed`][1.6rr] key.
9446 * crates.io will reject publication of crates with dependencies that
9447 have a wildcard version constraint. Crates with wildcard
9448 dependencies were seen to cause a variety of problems, as described
9449 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9451 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9452 release folder. A variety of artifacts that Cargo failed to clean
9453 are now correctly deleted.
9458 * The `unreachable_code` lint [warns when a function call's argument
9460 * The parser indicates [failures that may be caused by
9461 confusingly-similar Unicode characters][1.6uc]
9462 * Certain macro errors [are reported at definition time][1.6m], not
9468 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9469 environment variable when locating crates. This was a pre-cargo
9470 feature for integrating with the package manager that was
9471 accidentally never removed.
9472 * [A number of bugs were fixed in the privacy checker][1.6p] that
9473 could cause previously-accepted code to break.
9474 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9475 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9476 struct pattern syntax (`Foo(..)`) can no longer be used to match
9477 unit structs. This is a warning now, but will become an error in
9478 future releases. Patterns that share the same name as a const are
9480 * A bug was fixed that causes [rustc not to apply default type
9481 parameters][1.6xc] when resolving certain method implementations of
9482 traits defined in other crates.
9484 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9485 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9486 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9487 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9488 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9489 [1.6co]: http://doc.rust-lang.org/core/index.html
9490 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9491 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9492 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9493 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9494 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9495 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9496 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9497 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9498 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9499 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9500 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9501 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9502 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9503 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9504 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9505 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9506 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9507 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9508 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9509 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9510 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9511 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9512 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9513 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9514 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9515 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9516 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9517 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9518 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9519 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9520 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9521 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9522 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9523 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9524 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9525 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9526 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9527 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9528 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9529 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9530 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9533 Version 1.5.0 (2015-12-10)
9534 ==========================
9536 * ~700 changes, numerous bugfixes
9542 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9543 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9544 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9545 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9546 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9547 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9548 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9549 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9550 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9551 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9552 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9553 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9554 [`Path::read_link`], [`Path::symlink_metadata`],
9555 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9556 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9557 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9558 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9559 [`slice::split_first_mut`], [`slice::split_first`],
9560 [`slice::split_last_mut`], [`slice::split_last`],
9561 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9562 [`str::MatchIndices`], [`str::RMatchIndices`],
9563 [`str::match_indices`], [`str::rmatch_indices`],
9564 [`str::slice_mut_unchecked`], [`string::ParseError`].
9565 * Rust applications hosted on crates.io can be installed locally to
9566 `~/.cargo/bin` with the [`cargo install`] command. Among other
9567 things this makes it easier to augment Cargo with new subcommands:
9568 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9569 invoked as `cargo foo`.
9570 * Crates with wildcard (`*`) dependencies will [emit warnings when
9571 published][1.5w]. In 1.6 it will no longer be possible to publish
9572 crates with wildcard dependencies.
9577 * The rules determining when a particular lifetime must outlive
9578 a particular value (known as '[dropck]') have been [modified
9579 to not rely on parametricity][1.5p].
9580 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9581 and `Arc`][1.5a]. Because these smart pointer types implement
9582 `Deref`, this causes breakage in cases where the interior type
9583 contains methods of the same name.
9584 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9585 that they could drop their content. Soundness fix.
9586 * All method invocations are [properly checked][1.5wf1] for
9587 [well-formedness][1.5wf2]. Soundness fix.
9588 * Traits whose supertraits contain `Self` are [not object
9589 safe][1.5o]. Soundness fix.
9590 * Target specifications support a [`no_default_libraries`][1.5nd]
9591 setting that controls whether `-nodefaultlibs` is passed to the
9592 linker, and in turn the `is_like_windows` setting no longer affects
9593 the `-nodefaultlibs` flag.
9594 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9595 * The `#[inline]` and `#[repr]` attributes [can only appear
9596 in valid locations][1.5at].
9597 * Native libraries linked from the local crate are [passed to
9598 the linker before native libraries from upstream crates][1.5nl].
9599 * Two rarely-used attributes, `#[no_debug]` and
9600 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9601 * Negation of unsigned integers, which has been a warning for
9602 several releases, [is now behind a feature gate and will
9603 generate errors][1.5nu].
9604 * The parser accidentally accepted visibility modifiers on
9605 enum variants, a bug [which has been fixed][1.5ev].
9606 * [A bug was fixed that allowed `use` statements to import unstable
9612 * When evaluating expressions at compile-time that are not
9613 compile-time constants (const-evaluating expressions in non-const
9614 contexts), incorrect code such as overlong bitshifts and arithmetic
9615 overflow will [generate a warning instead of an error][1.5ce],
9616 delaying the error until runtime. This will allow the
9617 const-evaluator to be expanded in the future backwards-compatibly.
9618 * The `improper_ctypes` lint [no longer warns about using `isize` and
9619 `usize` in FFI][1.5ict].
9624 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9626 * `Default` is [implemented for mutable slices][1.5d].
9627 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9628 * There are now `From` conversions [between floating point
9629 types][1.5f] where the conversions are lossless.
9630 * There are now `From` conversions [between integer types][1.5i] where
9631 the conversions are lossless.
9632 * [`fs::Metadata` implements `Clone`][1.5fs].
9633 * The `parse` method [accepts a leading "+" when parsing
9635 * [`AsMut` is implemented for `Vec`][1.5am].
9636 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9637 been optimized][1.5cf] and no longer rely on the default impl.
9638 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9639 `unsafe extern "C"` function types now [implement `Clone`,
9640 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9641 `fmt::Debug` for up to 12 arguments][1.5fp].
9642 * [Dropping `Vec`s is much faster in unoptimized builds when the
9643 element types don't implement `Drop`][1.5dv].
9644 * A bug that caused in incorrect behavior when [combining `VecDeque`
9645 with zero-sized types][1.5vdz] was resolved.
9646 * [`PartialOrd` for slices is faster][1.5po].
9651 * [Crate metadata size was reduced by 20%][1.5md].
9652 * [Improvements to code generation reduced the size of libcore by 3.3
9653 MB and rustc's memory usage by 18MB][1.5m].
9654 * [Improvements to deref translation increased performance in
9655 unoptimized builds][1.5dr].
9656 * Various errors in trait resolution [are deduplicated to only be
9657 reported once][1.5te].
9658 * Rust has preliminary [support for rumprun kernels][1.5rr].
9659 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9661 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9662 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9663 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9664 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9665 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9666 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9667 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9668 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9669 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9670 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9671 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9672 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9673 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9674 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9675 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9676 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9677 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9678 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9679 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9680 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9681 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9682 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9683 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9684 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9685 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9686 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9687 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9688 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9689 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9690 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9691 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9692 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9693 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9694 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9695 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9696 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9697 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9698 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9699 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9700 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9701 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9702 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9703 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9704 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9705 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9706 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9707 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9708 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9709 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9710 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9711 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9712 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9713 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9714 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9715 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9716 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9717 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9718 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9719 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9720 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9721 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9722 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9723 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9724 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9725 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9726 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9727 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9728 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9729 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9730 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9731 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9732 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9733 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9734 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9735 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9736 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9737 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9738 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9739 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9740 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9741 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9742 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9743 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9744 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9745 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9746 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9747 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9748 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9749 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9751 Version 1.4.0 (2015-10-29)
9752 ==========================
9754 * ~1200 changes, numerous bugfixes
9759 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9760 GNU) are now supported and recommended for use.
9765 * [Several changes have been made to fix type soundness and improve
9766 the behavior of associated types][sound]. See [RFC 1214]. Although
9767 we have mostly introduced these changes as warnings this release, to
9768 become errors next release, there are still some scenarios that will
9769 see immediate breakage.
9770 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9771 line breaks in addition to `\n`][crlf].
9772 * [Loans of `'static` lifetime extend to the end of a function][stat].
9773 * [`str::parse` no longer introduces avoidable rounding error when
9774 parsing floating point numbers. Together with earlier changes to
9775 float formatting/output, "round trips" like f.to_string().parse()
9776 now preserve the value of f exactly. Additionally, leading plus
9777 signs are now accepted][fp3].
9783 * `use` statements that import multiple items [can now rename
9784 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9785 * [Binops work correctly on fat pointers][binfat].
9786 * `pub extern crate`, which does not behave as expected, [issues a
9787 warning][pec] until a better solution is found.
9792 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9793 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9794 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9795 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9796 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9797 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9798 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9799 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9800 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9801 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9802 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9803 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9804 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9805 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9806 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9807 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9808 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9809 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9811 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9812 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9813 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9814 `f64::from_str_radix`.
9815 * [Reverse-searching strings is faster with the 'two-way'
9817 * [`std::io::copy` allows `?Sized` arguments][cc].
9818 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9819 [override `count`, `nth` and `last` with an *O*(1)
9820 implementation][it].
9821 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9822 * [`IntoRawFd` has been added to the Unix-specific prelude,
9823 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9825 * [`Extend<String>` and `FromIterator<String` are both implemented for
9827 * [`IntoIterator` is implemented for references to `Option` and
9829 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9830 Copy`][ext] as part of [RFC 839]. This will cause type inference
9831 breakage in rare situations.
9832 * [`BinaryHeap` implements `Debug`][bh2].
9833 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9835 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9836 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9837 * [String comparison is faster][faststr].
9838 * `&mut T` where `T: std::fmt::Write` [also implements
9839 `std::fmt::Write`][mutw].
9840 * [A stable regression in `VecDeque::push_back` and other
9841 capacity-altering methods that caused panics for zero-sized types
9843 * [Function pointers implement traits for up to 12 parameters][fp2].
9848 * The compiler [no longer uses the 'morestack' feature to prevent
9849 stack overflow][mm]. Instead it uses guard pages and stack
9850 probes (though stack probes are not yet implemented on any platform
9852 * [The compiler matches traits faster when projections are involved][p].
9853 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9855 * [Cargo now displays useful information about what its doing during
9856 `cargo update`][cu].
9858 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9859 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9860 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9861 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9862 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9863 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9864 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9865 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9866 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9867 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9868 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9869 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9870 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9871 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9872 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9873 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9874 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9875 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9876 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9877 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9878 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9879 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9880 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9881 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9882 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9883 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9884 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9885 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9886 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9887 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9888 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9889 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9890 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9891 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9892 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9893 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9894 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9895 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9896 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9897 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9898 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9899 [bh2]: https://github.com/rust-lang/rust/pull/28156
9900 [binfat]: https://github.com/rust-lang/rust/pull/28270
9901 [bm]: https://github.com/rust-lang/rust/pull/28197
9902 [cc]: https://github.com/rust-lang/rust/pull/27531
9903 [crlf]: https://github.com/rust-lang/rust/pull/28034
9904 [cu]: https://github.com/rust-lang/cargo/pull/1931
9905 [d]: https://github.com/rust-lang/rust/pull/27825
9906 [dep]: https://github.com/rust-lang/rust/pull/28339
9907 [es]: https://github.com/rust-lang/rust/pull/27956
9908 [ext]: https://github.com/rust-lang/rust/pull/28094
9909 [faststr]: https://github.com/rust-lang/rust/pull/28338
9910 [ffi]: https://github.com/rust-lang/rust/pull/28779
9911 [fp]: https://github.com/rust-lang/rust/pull/28268
9912 [fp2]: https://github.com/rust-lang/rust/pull/28560
9913 [fp3]: https://github.com/rust-lang/rust/pull/27307
9914 [i]: https://github.com/rust-lang/rust/pull/27451
9915 [into2]: https://github.com/rust-lang/rust/pull/28039
9916 [it]: https://github.com/rust-lang/rust/pull/27652
9917 [mm]: https://github.com/rust-lang/rust/pull/27338
9918 [mutw]: https://github.com/rust-lang/rust/pull/28368
9919 [sound]: https://github.com/rust-lang/rust/pull/27641
9920 [p]: https://github.com/rust-lang/rust/pull/27866
9921 [pec]: https://github.com/rust-lang/rust/pull/28486
9922 [pr]: https://github.com/rust-lang/rust/pull/27896
9923 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9924 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9925 [s]: https://github.com/rust-lang/rust/pull/27474
9926 [stab]: https://github.com/rust-lang/rust/pull/28339
9927 [stat]: https://github.com/rust-lang/rust/pull/28321
9928 [vd]: https://github.com/rust-lang/rust/pull/28494
9930 Version 1.3.0 (2015-09-17)
9931 ==============================
9933 * ~900 changes, numerous bugfixes
9938 * The [new object lifetime defaults][nold] have been [turned
9939 on][nold2] after a cycle of warnings about the change. Now types
9940 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9941 being interpreted as `&'a Box<Trait+'a>` to `&'a
9942 Box<Trait+'static>`.
9943 * [The Rustonomicon][nom] is a new book in the official documentation
9944 that dives into writing unsafe Rust.
9945 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9946 timekeeping is employed by other std APIs, as well as out-of-tree
9952 * The [new object lifetime defaults][nold] have been [turned
9953 on][nold2] after a cycle of warnings about the change.
9954 * There is a known [regression][lr] in how object lifetime elision is
9955 interpreted, the proper solution for which is undetermined.
9956 * The `#[prelude_import]` attribute, an internal implementation
9957 detail, was accidentally stabilized previously. [It has been put
9958 behind the `prelude_import` feature gate][pi]. This change is
9959 believed to break no existing code.
9960 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9961 [more sane for dynamically sized types][dst3]. Code that relied on
9962 the previous behavior is thought to be broken.
9963 * The `dropck` rules, which checks that destructors can't access
9964 destroyed values, [have been updated][dropck] to match the
9965 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9966 cause some previously-compiling code to no longer build.
9971 * The [new object lifetime defaults][nold] have been [turned
9972 on][nold2] after a cycle of warnings about the change.
9973 * Semicolons may [now follow types and paths in
9974 macros](https://github.com/rust-lang/rust/pull/27000).
9975 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9976 [more sane for dynamically sized types][dst3]. Code that relied on
9977 the previous behavior is not known to exist, and suspected to be
9979 * `'static` variables [may now be recursive][st].
9980 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9981 implementations correctly.
9982 * The `dropck` rules, which checks that destructors can't access
9983 destroyed values, [have been updated][dropck] to match the
9989 * The [`Duration`] API, [has been stabilized][ds], as well as the
9990 `std::time` module, which presently contains only `Duration`.
9991 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9992 * The owned C string, [`CString`], implements [`Borrow`] and the
9993 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9994 these allow C strings to be borrowed and cloned in generic code.
9995 * [`CStr`] implements [`Debug`].
9996 * [`AtomicPtr`] implements [`Debug`].
9997 * [`Error`] trait objects [can be downcast to their concrete types][e]
9998 in many common configurations, using the [`is`], [`downcast`],
9999 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
10001 * Searching for substrings now [employs the two-way algorithm][search]
10002 instead of doing a naive search. This gives major speedups to a
10003 number of methods, including [`contains`][sc], [`find`][sf],
10004 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
10005 [`ends_with`][sew] are also faster.
10006 * The performance of `PartialEq` for slices is [much faster][ps].
10007 * The [`Hash`] trait offers the default method, [`hash_slice`], which
10008 is overridden and optimized by the implementations for scalars.
10009 * The [`Hasher`] trait now has a number of specialized `write_*`
10010 methods for primitive types, for efficiency.
10011 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
10012 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
10013 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
10014 of [`std::error::Error::cause`][iec] also delegates to the inner
10016 * [`process::Child`][pc] gained the [`id`] method, which returns a
10017 `u32` representing the platform-specific process identifier.
10018 * The [`connect`] method on slices is deprecated, replaced by the new
10019 [`join`] method (note that both of these are on the *unstable*
10020 [`SliceConcatExt`] trait, but through the magic of the prelude are
10021 available to stable code anyway).
10022 * The [`Div`] operator is implemented for [`Wrapping`] types.
10023 * [`DerefMut` is implemented for `String`][dms].
10024 * Performance of SipHash (the default hasher for `HashMap`) is
10025 [better for long data][sh].
10026 * [`AtomicPtr`] implements [`Send`].
10027 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
10028 are now [specialized to use uninitialized buffers for increased
10030 * Lifetime parameters of foreign functions [are now resolved
10036 * Rust can now, with some coercion, [produce programs that run on
10037 Windows XP][xp], though XP is not considered a supported platform.
10038 * Porting Rust on Windows from the GNU toolchain to MSVC continues
10039 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
10040 recommended for use in 1.3, though should be fully-functional
10041 in the [64-bit 1.4 beta][b14].
10042 * On Fedora-based systems installation will [properly configure the
10043 dynamic linker][fl].
10044 * The compiler gained many new extended error descriptions, which can
10045 be accessed with the `--explain` flag.
10046 * The `dropck` pass, which checks that destructors can't access
10047 destroyed values, [has been rewritten][27261]. This fixes some
10048 soundness holes, and as such will cause some previously-compiling
10049 code to no longer build.
10050 * `rustc` now uses [LLVM to write archive files where possible][ar].
10051 Eventually this will eliminate the compiler's dependency on the ar
10053 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
10054 supported FreeBSD on x86_64).
10055 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
10056 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
10058 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
10059 will kill the process instead of leaking][nlp].
10061 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
10062 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
10063 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
10064 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
10065 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
10066 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10067 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10068 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
10069 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
10070 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
10071 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
10072 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
10073 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
10074 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
10075 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
10076 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
10077 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
10078 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
10079 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10080 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
10081 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
10082 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
10083 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
10084 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
10085 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
10086 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
10087 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
10088 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
10089 [ar]: https://github.com/rust-lang/rust/pull/26926
10090 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
10091 [dms]: https://github.com/rust-lang/rust/pull/26241
10092 [27261]: https://github.com/rust-lang/rust/pull/27261
10093 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10094 [ds]: https://github.com/rust-lang/rust/pull/26818
10095 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
10096 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
10097 [dst3]: https://github.com/rust-lang/rust/pull/27351
10098 [e]: https://github.com/rust-lang/rust/pull/24793
10099 [f]: https://github.com/rust-lang/rust/pull/26588
10100 [26959]: https://github.com/rust-lang/rust/pull/26959
10101 [fl]: https://github.com/rust-lang/rust-installer/pull/41
10102 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
10103 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
10104 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
10105 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
10106 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
10107 [lic]: https://github.com/rust-lang/rust/pull/26583
10108 [lnu]: https://github.com/rust-lang/rust/pull/27026
10109 [lr]: https://github.com/rust-lang/rust/issues/27248
10110 [lum]: https://github.com/rust-lang/rust/pull/26378
10111 [lur]: https://github.com/rust-lang/rust/pull/26783
10112 [nlp]: https://github.com/rust-lang/rust/pull/27176
10113 [nold2]: https://github.com/rust-lang/rust/pull/27045
10114 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
10115 [nom]: http://doc.rust-lang.org/nightly/nomicon/
10116 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
10117 [pi]: https://github.com/rust-lang/rust/pull/26699
10118 [ps]: https://github.com/rust-lang/rust/pull/26884
10119 [rte]: https://github.com/rust-lang/rust/pull/26950
10120 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
10121 [search]: https://github.com/rust-lang/rust/pull/26327
10122 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
10123 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
10124 [sh]: https://github.com/rust-lang/rust/pull/27280
10125 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
10126 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
10127 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
10128 [st]: https://github.com/rust-lang/rust/pull/26630
10129 [win1]: https://github.com/rust-lang/rust/pull/26569
10130 [win2]: https://github.com/rust-lang/rust/pull/26741
10131 [win3]: https://github.com/rust-lang/rust/pull/26741
10132 [win4]: https://github.com/rust-lang/rust/pull/27210
10133 [xp]: https://github.com/rust-lang/rust/pull/26569
10135 Version 1.2.0 (2015-08-07)
10136 ==========================
10138 * ~1200 changes, numerous bugfixes
10143 * [Dynamically-sized-type coercions][dst] allow smart pointer types
10144 like `Rc` to contain types without a fixed size, arrays and trait
10145 objects, finally enabling use of `Rc<[T]>` and completing the
10146 implementation of DST.
10147 * [Parallel codegen][parcodegen] is now working again, which can
10148 substantially speed up large builds in debug mode; It also gets
10149 another ~33% speedup when bootstrapping on a 4 core machine (using 8
10150 jobs). It's not enabled by default, but will be "in the near
10151 future". It can be activated with the `-C codegen-units=N` flag to
10153 * This is the first release with [experimental support for linking
10154 with the MSVC linker and lib C on Windows (instead of using the GNU
10155 variants via MinGW)][win]. It is yet recommended only for the most
10156 intrepid Rustaceans.
10157 * Benchmark compilations are showing a 30% improvement in
10158 bootstrapping over 1.1.
10163 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
10164 unicode case mapping, which is a previously-planned change in
10165 behavior and considered a bugfix.
10166 * [`mem::align_of`] now specifies [the *minimum alignment* for
10167 T][align], which is usually the alignment programs are interested
10168 in, and the same value reported by clang's
10169 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
10171 * [The `#[packed]` attribute is no longer silently accepted by the
10172 compiler][packed]. This attribute did nothing and code that
10173 mentioned it likely did not work as intended.
10174 * Associated type defaults are [now behind the
10175 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
10176 defaults *did not work*, but could be mentioned syntactically. As
10177 such this breakage has minimal impact.
10182 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
10183 matching against dereferenceable values.
10188 * The [`Extend`] trait, which grows a collection from an iterator, is
10189 implemented over iterators of references, for `String`, `Vec`,
10190 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
10191 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
10192 * The [`iter::once`] function returns an iterator that yields a single
10193 element, and [`iter::empty`] returns an iterator that yields no
10195 * The [`matches`] and [`rmatches`] methods on `str` return iterators
10196 over substring matches.
10197 * [`Cell`] and [`RefCell`] both implement `Eq`.
10198 * A number of methods for wrapping arithmetic are added to the
10199 integral types, [`wrapping_div`], [`wrapping_rem`],
10200 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
10201 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
10202 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
10203 type.. It is illegal for the default arithmetic operations in Rust
10204 to overflow; the desire to wrap must be explicit.
10205 * The `{:#?}` formatting specifier [displays the alternate,
10206 pretty-printed][debugfmt] form of the `Debug` formatter. This
10207 feature was actually introduced prior to 1.0 with little
10209 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
10210 for writing data to formatted strings, similar to [`io::Write`].
10211 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
10212 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
10213 are used by code generators to emit implementations of [`Debug`].
10214 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
10215 methods that convert case, following Unicode case mapping.
10216 * It is now easier to handle poisoned locks. The [`PoisonError`]
10217 type, returned by failing lock operations, exposes `into_inner`,
10218 `get_ref`, and `get_mut`, which all give access to the inner lock
10219 guard, and allow the poisoned lock to continue to operate. The
10220 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
10221 poisoned lock without attempting to take the lock.
10222 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
10223 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
10224 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
10225 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
10227 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
10233 * `rustc` employs smarter heuristics for guessing at [typos].
10234 * `rustc` emits more efficient code for [no-op conversions between
10235 unsafe pointers][nop].
10236 * Fat pointers are now [passed in pairs of immediate arguments][fat],
10237 resulting in faster compile times and smaller code.
10239 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
10240 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
10241 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
10242 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
10243 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
10244 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
10245 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
10246 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
10247 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
10248 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
10249 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
10250 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
10251 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
10252 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
10253 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
10254 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
10255 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
10256 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
10257 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
10258 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
10259 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
10260 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
10261 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
10262 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
10263 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
10264 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
10265 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
10266 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
10267 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
10268 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
10269 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
10270 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
10271 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
10272 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10273 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10274 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
10275 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
10276 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
10277 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
10278 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
10279 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
10280 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
10281 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
10282 [align]: https://github.com/rust-lang/rust/pull/25646
10283 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
10284 [typos]: https://github.com/rust-lang/rust/pull/26087
10285 [nop]: https://github.com/rust-lang/rust/pull/26336
10286 [fat]: https://github.com/rust-lang/rust/pull/26411
10287 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
10288 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
10289 [packed]: https://github.com/rust-lang/rust/pull/25541
10290 [ad]: https://github.com/rust-lang/rust/pull/27382
10291 [win]: https://github.com/rust-lang/rust/pull/25350
10293 Version 1.1.0 (2015-06-25)
10294 =========================
10296 * ~850 changes, numerous bugfixes
10301 * The [`std::fs` module has been expanded][fs] to expand the set of
10302 functionality exposed:
10303 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
10304 don't incur a syscall on some platforms.
10305 * A `symlink_metadata` function has been added.
10306 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
10307 access to all underlying information.
10308 * The compiler now contains extended explanations of many errors. When an error
10309 with an explanation occurs the compiler suggests using the `--explain` flag
10310 to read the explanation. Error explanations are also [available online][err-index].
10311 * Thanks to multiple [improvements][sk] to [type checking][pre], as
10312 well as other work, the time to bootstrap the compiler decreased by
10318 * The [`str::split_whitespace`] method splits a string on unicode
10319 whitespace boundaries.
10320 * On both Windows and Unix, new extension traits provide conversion of
10321 I/O types to and from the underlying system handles. On Unix, these
10322 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
10323 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
10324 `TcpListener`, and `UpdSocket`. Further implementations for
10325 `std::process` will be stabilized later.
10326 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
10327 Windows, symlinks can be created with
10328 `std::os::windows::symlink_dir` and
10329 `std::os::windows::symlink_file`.
10330 * The `mpsc::Receiver` type can now be converted into an iterator with
10331 `into_iter` on the [`IntoIterator`] trait.
10332 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
10333 implementation of the [`From`] trait.
10334 * The `Debug` implementation for `RangeFull` [creates output that is
10335 more consistent with other implementations][rf].
10336 * [`Debug` is implemented for `File`][file].
10337 * The `Default` implementation for `Arc` [no longer requires `Sync +
10339 * [The `Iterator` methods `count`, `nth`, and `last` have been
10340 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10341 * Incorrect handling of paths on Windows has been improved in both the
10342 compiler and the standard library.
10343 * [`AtomicPtr` gained a `Default` implementation][ap].
10344 * In accordance with Rust's policy on arithmetic overflow `abs` now
10345 [panics on overflow when debug assertions are enabled][abs].
10346 * The [`Cloned`] iterator, which was accidentally left unstable for
10347 1.0 [has been stabilized][c].
10348 * The [`Incoming`] iterator, which iterates over incoming TCP
10349 connections, and which was accidentally unnamable in 1.0, [is now
10350 properly exported][inc].
10351 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10352 `sift_up` or `sift_down` panic][bh].
10353 * The [`split_off`] method of `LinkedList` [no longer corrupts
10354 the list in certain scenarios][ll].
10359 * Type checking performance [has improved notably][sk] with
10360 [multiple improvements][pre].
10361 * The compiler [suggests code changes][ch] for more errors.
10362 * rustc and it's build system have experimental support for [building
10363 toolchains against MUSL][m] instead of glibc on Linux.
10364 * The compiler defines the `target_env` cfg value, which is used for
10365 distinguishing toolchains that are otherwise for the same
10366 platform. Presently this is set to `gnu` for common GNU Linux
10367 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10368 * The [`cargo rustc`][crc] command invokes a build with custom flags
10370 * [Android executables are always position independent][pie].
10371 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10372 with `Drop`][24935].
10374 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10375 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10376 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10377 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10378 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10379 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10380 [rf]: https://github.com/rust-lang/rust/pull/24491
10381 [err-index]: https://doc.rust-lang.org/error-index.html
10382 [sk]: https://github.com/rust-lang/rust/pull/24615
10383 [pre]: https://github.com/rust-lang/rust/pull/25323
10384 [file]: https://github.com/rust-lang/rust/pull/24598
10385 [ch]: https://github.com/rust-lang/rust/pull/24683
10386 [arc]: https://github.com/rust-lang/rust/pull/24695
10387 [si]: https://github.com/rust-lang/rust/pull/24701
10388 [ap]: https://github.com/rust-lang/rust/pull/24834
10389 [m]: https://github.com/rust-lang/rust/pull/24777
10390 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10391 [crc]: https://github.com/rust-lang/cargo/pull/1568
10392 [pie]: https://github.com/rust-lang/rust/pull/24953
10393 [abs]: https://github.com/rust-lang/rust/pull/25441
10394 [c]: https://github.com/rust-lang/rust/pull/25496
10395 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10396 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10397 [inc]: https://github.com/rust-lang/rust/pull/25522
10398 [bh]: https://github.com/rust-lang/rust/pull/25856
10399 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10400 [ll]: https://github.com/rust-lang/rust/pull/26022
10401 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10402 [24935]: https://github.com/rust-lang/rust/pull/24935
10404 Version 1.0.0 (2015-05-15)
10405 ========================
10407 * ~1500 changes, numerous bugfixes
10412 * The vast majority of the standard library is now `#[stable]`. It is
10413 no longer possible to use unstable features with a stable build of
10415 * Many popular crates on [crates.io] now work on the stable release
10417 * Arithmetic on basic integer types now [checks for overflow in debug
10423 * Several [restrictions have been added to trait coherence][coh] in
10424 order to make it easier for upstream authors to change traits
10425 without breaking downstream code.
10426 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10427 improve error messages and macro behavior. For example, `0b1234` is
10428 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10429 * Trait bounds [are always invariant][inv], eliminating the need for
10430 the `PhantomFn` and `MarkerTrait` lang items, which have been
10432 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10433 "foo" as bar` syntax has been replaced with `extern crate foo as
10434 bar`, and Cargo now automatically translates "-" in *package* names
10435 to underscore for the crate name.
10436 * [Lifetime shadowing is an error][lt].
10437 * [`Send` no longer implies `'static`][send-rfc].
10438 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10439 `MyType::default()`.
10440 * Primitive types [now have inherent methods][prim-inherent],
10441 obviating the need for extension traits like `SliceExt`.
10442 * Methods with `Self: Sized` in their `where` clause are [considered
10443 object-safe][self-sized], allowing many extension traits like
10444 `IteratorExt` to be merged into the traits they extended.
10445 * You can now [refer to associated types][assoc-where] whose
10446 corresponding trait bounds appear only in a `where` clause.
10447 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10448 like `Send` and `Sync` are now library-defined.
10449 * A [Reflect trait][reflect] was introduced, which means that
10450 downcasting via the `Any` trait is effectively limited to concrete
10451 types. This helps retain the potentially-important "parametricity"
10452 property: generic code cannot behave differently for different type
10453 arguments except in minor ways.
10454 * The `unsafe_destructor` feature is now deprecated in favor of the
10455 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10461 * The `thread_local` module [has been renamed to `std::thread`][th].
10462 * The methods of `IteratorExt` [have been moved to the `Iterator`
10463 trait itself][23300].
10464 * Several traits that implement Rust's conventions for type
10465 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10466 [centralized in the `std::convert` module][con].
10467 * The `FromError` trait [was removed in favor of `From`][fe].
10468 * The basic sleep function [has moved to
10469 `std::thread::sleep_ms`][slp].
10470 * The `splitn` function now takes an `n` parameter that represents the
10471 number of items yielded by the returned iterator [instead of the
10472 number of 'splits'][spl].
10473 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10474 * [Derived implementations of `PartialOrd` now order enums according
10475 to their explicitly-assigned discriminants][po].
10476 * [Methods for searching strings are generic over `Pattern`s][pat],
10477 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10479 * [In method resolution, object methods are resolved before inherent
10481 * [`String::from_str` has been deprecated in favor of the `From` impl,
10482 `String::from`][24517].
10483 * [`io::Error` implements `Sync`][ios].
10484 * [The `words` method on `&str` has been replaced with
10485 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10487 * The new path and IO modules are complete and `#[stable]`. This
10488 was the major library focus for this cycle.
10489 * The path API was [revised][path-normalize] to normalize `.`,
10490 adjusting the tradeoffs in favor of the most common usage.
10491 * A large number of remaining APIs in `std` were also stabilized
10492 during this cycle; about 75% of the non-deprecated API surface
10494 * The new [string pattern API][string-pattern] landed, which makes
10495 the string slice API much more internally consistent and flexible.
10496 * A new set of [generic conversion traits][conversion] replaced
10497 many existing ad hoc traits.
10498 * Generic numeric traits were [completely removed][num-traits]. This
10499 was made possible thanks to inherent methods for primitive types,
10500 and the removal gives maximal flexibility for designing a numeric
10501 hierarchy in the future.
10502 * The `Fn` traits are now related via [inheritance][fn-inherit]
10503 and provide ergonomic [blanket implementations][fn-blanket].
10504 * The `Index` and `IndexMut` traits were changed to
10505 [take the index by value][index-value], enabling code like
10506 `hash_map["string"]` to work.
10507 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10508 `Copy` data is known to be `Clone` as well.
10513 * Many errors now have extended explanations that can be accessed with
10514 the `--explain` flag to `rustc`.
10515 * Many new examples have been added to the standard library
10517 * rustdoc has received a number of improvements focused on completion
10519 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10520 * Much headway was made on ecosystem-wide CI, making it possible
10521 to [compare builds for breakage][ci-compare].
10524 [crates.io]: http://crates.io
10525 [clo]: https://github.com/rust-lang/rust/pull/24034
10526 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10527 [con]: https://github.com/rust-lang/rust/pull/23875
10528 [cr]: https://github.com/rust-lang/rust/pull/23419
10529 [fe]: https://github.com/rust-lang/rust/pull/23879
10530 [23300]: https://github.com/rust-lang/rust/pull/23300
10531 [inv]: https://github.com/rust-lang/rust/pull/23938
10532 [ios]: https://github.com/rust-lang/rust/pull/24133
10533 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10534 [lt]: https://github.com/rust-lang/rust/pull/24057
10535 [meth]: https://github.com/rust-lang/rust/pull/24056
10536 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10537 [po]: https://github.com/rust-lang/rust/pull/24270
10538 [24517]: https://github.com/rust-lang/rust/pull/24517
10539 [slp]: https://github.com/rust-lang/rust/pull/23949
10540 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10541 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10542 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10543 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10544 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10545 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10546 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10547 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10548 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10549 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10550 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10551 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10552 [reflect]: https://github.com/rust-lang/rust/pull/23712
10553 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10554 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10555 [index-value]: https://github.com/rust-lang/rust/pull/23601
10556 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10557 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10558 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10559 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10560 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10561 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10564 Version 1.0.0-alpha.2 (2015-02-20)
10565 =====================================
10567 * ~1300 changes, numerous bugfixes
10571 * The various I/O modules were [overhauled][io-rfc] to reduce
10572 unnecessary abstractions and provide better interoperation with
10573 the underlying platform. The old `io` module remains temporarily
10575 * The standard library now [participates in feature gating][feat],
10576 so use of unstable libraries now requires a `#![feature(...)]`
10577 attribute. The impact of this change is [described on the
10578 forum][feat-forum]. [RFC][feat-rfc].
10582 * `for` loops [now operate on the `IntoIterator` trait][into],
10583 which eliminates the need to call `.iter()`, etc. to iterate
10584 over collections. There are some new subtleties to remember
10585 though regarding what sort of iterators various types yield, in
10586 particular that `for foo in bar { }` yields values from a move
10587 iterator, destroying the original collection. [RFC][into-rfc].
10588 * Objects now have [default lifetime bounds][obj], so you don't
10589 have to write `Box<Trait+'static>` when you don't care about
10590 storing references. [RFC][obj-rfc].
10591 * In types that implement `Drop`, [lifetimes must outlive the
10592 value][drop]. This will soon make it possible to safely
10593 implement `Drop` for types where `#[unsafe_destructor]` is now
10594 required. Read the [gorgeous RFC][drop-rfc] for details.
10595 * The fully qualified <T as Trait>::X syntax lets you set the Self
10596 type for a trait method or associated type. [RFC][ufcs-rfc].
10597 * References to types that implement `Deref<U>` now [automatically
10598 coerce to references][deref] to the dereferenced type `U`,
10599 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10600 should eliminate many unsightly uses of `&*`, as when converting
10601 from references to vectors into references to
10602 slices. [RFC][deref-rfc].
10603 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10604 `|:|`) is obsolete and closure kind is inferred from context.
10605 * [`Self` is a keyword][Self].
10609 * The `Show` and `String` formatting traits [have been
10610 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10611 their related purposes. Automatically getting a string
10612 conversion to use with `format!("{:?}", something_to_debug)` is
10613 now written `#[derive(Debug)]`.
10614 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10615 OsStr}`, provide strings in platform-specific encodings for easier
10616 interop with system APIs. [RFC][osstr-rfc].
10617 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10618 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10619 creating raw pointers.
10623 * Certain long error messages of the form 'expected foo found bar'
10624 are now [split neatly across multiple
10625 lines][multiline]. Examples in the PR.
10626 * On Unix Rust can be [uninstalled][un] by running
10627 `/usr/local/lib/rustlib/uninstall.sh`.
10628 * The `#[rustc_on_unimplemented]` attribute, requiring the
10629 'on_unimplemented' feature, lets rustc [display custom error
10630 messages when a trait is expected to be implemented for a type
10635 * Rust is tested against a [LALR grammar][lalr], which parses
10636 almost all the Rust files that rustc does.
10638 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10639 [close]: https://github.com/rust-lang/rust/pull/21843
10640 [deref]: https://github.com/rust-lang/rust/pull/21351
10641 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10642 [drop]: https://github.com/rust-lang/rust/pull/21972
10643 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10644 [feat]: https://github.com/rust-lang/rust/pull/21248
10645 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10646 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10647 [fmt]: https://github.com/rust-lang/rust/pull/21457
10648 [into]: https://github.com/rust-lang/rust/pull/20790
10649 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10650 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10651 [lalr]: https://github.com/rust-lang/rust/pull/21452
10652 [multiline]: https://github.com/rust-lang/rust/pull/19870
10653 [obj]: https://github.com/rust-lang/rust/pull/22230
10654 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10655 [onun]: https://github.com/rust-lang/rust/pull/20889
10656 [osstr]: https://github.com/rust-lang/rust/pull/21488
10657 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10658 [Self]: https://github.com/rust-lang/rust/pull/22158
10659 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10660 [un]: https://github.com/rust-lang/rust/pull/22256
10663 Version 1.0.0-alpha (2015-01-09)
10664 ==================================
10666 * ~2400 changes, numerous bugfixes
10670 * The language itself is considered feature complete for 1.0,
10671 though there will be many usability improvements and bugfixes
10672 before the final release.
10673 * Nearly 50% of the public API surface of the standard library has
10674 been declared 'stable'. Those interfaces are unlikely to change
10676 * The long-running debate over integer types has been
10677 [settled][ints]: Rust will ship with types named `isize` and
10678 `usize`, rather than `int` and `uint`, for pointer-sized
10679 integers. Guidelines will be rolled out during the alpha cycle.
10680 * Most crates that are not `std` have been moved out of the Rust
10681 distribution into the Cargo ecosystem so they can evolve
10682 separately and don't need to be stabilized as quickly, including
10683 'time', 'getopts', 'num', 'regex', and 'term'.
10684 * Documentation continues to be expanded with more API coverage, more
10685 examples, and more in-depth explanations. The guides have been
10686 consolidated into [The Rust Programming Language][trpl].
10687 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10688 * All official Rust binary installers now come with [Cargo], the
10689 Rust package manager.
10693 * Closures have been [completely redesigned][unboxed] to be
10694 implemented in terms of traits, can now be used as generic type
10695 bounds and thus monomorphized and inlined, or via an opaque
10696 pointer (boxed) as in the old system. The new system is often
10697 referred to as 'unboxed' closures.
10698 * Traits now support [associated types][assoc], allowing families
10699 of related types to be defined together and used generically in
10701 * Enum variants are [namespaced by their type names][enum].
10702 * [`where` clauses][where] provide a more versatile and attractive
10703 syntax for specifying generic bounds, though the previous syntax
10705 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10707 * Rust [no longer has a runtime][rt] of any description, and only
10708 supports OS threads, not green threads.
10709 * At long last, Rust has been overhauled for 'dynamically-sized
10710 types' ([DST]), which integrates 'fat pointers' (object types,
10711 arrays, and `str`) more deeply into the type system, making it
10713 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10714 `..j` that produce range types and which, when combined with the
10715 `Index` operator and multidispatch, leads to a convenient slice
10716 notation, `[i..j]`.
10717 * The new range syntax revealed an ambiguity in the fixed-length
10718 array syntax, so now fixed length arrays [are written `[T;
10720 * The `Copy` trait is no longer implemented automatically. Unsafe
10721 pointers no longer implement `Sync` and `Send` so types
10722 containing them don't automatically either. `Sync` and `Send`
10723 are now 'unsafe traits' so one can "forcibly" implement them via
10724 `unsafe impl` if a type confirms to the requirements for them
10725 even though the internals do not (e.g. structs containing unsafe
10726 pointers like `Arc`). These changes are intended to prevent some
10727 footguns and are collectively known as [opt-in built-in
10728 traits][oibit] (though `Sync` and `Send` will soon become pure
10729 library types unknown to the compiler).
10730 * Operator traits now take their operands [by value][ops], and
10731 comparison traits can use multidispatch to compare one type
10732 against multiple other types, allowing e.g. `String` to be
10733 compared with `&str`.
10734 * `if let` and `while let` are no longer feature-gated.
10735 * Rust has adopted a more [uniform syntax for escaping unicode
10736 characters][unicode].
10737 * `macro_rules!` [has been declared stable][mac]. Though it is a
10738 flawed system it is sufficiently popular that it must be usable
10739 for 1.0. Effort has gone into [future-proofing][mac-future] it
10740 in ways that will allow other macro systems to be developed in
10741 parallel, and won't otherwise impact the evolution of the
10743 * The prelude has been [pared back significantly][prelude] such
10744 that it is the minimum necessary to support the most pervasive
10745 code patterns, and through [generalized where clauses][where]
10746 many of the prelude extension traits have been consolidated.
10747 * Rust's rudimentary reflection [has been removed][refl], as it
10748 incurred too much code generation for little benefit.
10749 * [Struct variants][structvars] are no longer feature-gated.
10750 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10751 known as 'higher-ranked trait bounds', this crucially allows
10752 unboxed closures to work.
10753 * Macros invocations surrounded by parens or square brackets and
10754 not terminated by a semicolon are [parsed as
10755 expressions][macros], which makes expressions like `vec![1i32,
10756 2, 3].len()` work as expected.
10757 * Trait objects now implement their traits automatically, and
10758 traits that can be coerced to objects now must be [object
10760 * Automatically deriving traits is now done with `#[derive(...)]`
10761 not `#[deriving(...)]` for [consistency with other naming
10762 conventions][derive].
10763 * Importing the containing module or enum at the same time as
10764 items or variants they contain is [now done with `self` instead
10765 of `mod`][self], as in use `foo::{self, bar}`
10766 * Glob imports are no longer feature-gated.
10767 * The `box` operator and `box` patterns have been feature-gated
10768 pending a redesign. For now unique boxes should be allocated
10769 like other containers, with `Box::new`.
10773 * A [series][coll1] of [efforts][coll2] to establish
10774 [conventions][coll3] for collections types has resulted in API
10775 improvements throughout the standard library.
10776 * New [APIs for error handling][err] provide ergonomic interop
10777 between error types, and [new conventions][err-conv] describe
10778 more clearly the recommended error handling strategies in Rust.
10779 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10780 it is easier to discuss failure in the context of error handling
10781 without making clarifications as to whether you are referring to
10782 the 'fail' macro or failure more generally.
10783 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10784 syscall when available.
10785 * The 'serialize' crate has been renamed 'rustc-serialize' and
10786 moved out of the distribution to Cargo. Although it is widely
10787 used now, it is expected to be superseded in the near future.
10788 * The `Show` formatter, typically implemented with
10789 `#[derive(Show)]` is [now requested with the `{:?}`
10790 specifier][show] and is intended for use by all types, for uses
10791 such as `println!` debugging. The new `String` formatter must be
10792 implemented by hand, uses the `{}` specifier, and is intended
10793 for full-fidelity conversions of things that can logically be
10794 represented as strings.
10798 * [Flexible target specification][flex] allows rustc's code
10799 generation to be configured to support otherwise-unsupported
10801 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10802 respective debuggers with Rust-appropriate pretty-printing.
10803 * The Windows installation of Rust is distributed with the
10804 MinGW components currently required to link binaries on that
10809 * Nullable enum optimizations have been extended to more types so
10810 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10811 space than the inner types themselves.
10812 * Work has begun on supporting AArch64.
10814 [Cargo]: https://crates.io
10815 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10816 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10817 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10818 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10819 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10820 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10821 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10822 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10823 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10824 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10825 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10826 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10827 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10828 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10829 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10830 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10831 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10832 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10833 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10834 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10835 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10836 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10837 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10838 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10839 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10840 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10841 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10842 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10843 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10844 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10845 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10846 [trpl]: https://doc.rust-lang.org/book/index.html
10847 [rbe]: http://rustbyexample.com/
10850 Version 0.12.0 (2014-10-09)
10851 =============================
10853 * ~1900 changes, numerous bugfixes
10857 * The introductory documentation (now called The Rust Guide) has
10858 been completely rewritten, as have a number of supplementary
10860 * Rust's package manager, Cargo, continues to improve and is
10861 sometimes considered to be quite awesome.
10862 * Many API's in `std` have been reviewed and updated for
10863 consistency with the in-development Rust coding
10864 guidelines. The standard library documentation tracks
10865 stabilization progress.
10866 * Minor libraries have been moved out-of-tree to the rust-lang org
10867 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10868 be installed with Cargo.
10869 * Lifetime elision allows lifetime annotations to be left off of
10870 function declarations in many common scenarios.
10871 * Rust now works on 64-bit Windows.
10874 * Indexing can be overloaded with the `Index` and `IndexMut`
10876 * The `if let` construct takes a branch only if the `let` pattern
10877 matches, currently behind the 'if_let' feature gate.
10878 * 'where clauses', a more flexible syntax for specifying trait
10879 bounds that is more aesthetic, have been added for traits and
10880 free functions. Where clauses will in the future make it
10881 possible to constrain associated types, which would be
10882 impossible with the existing syntax.
10883 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10884 the 'slicing_syntax' feature gate, and can be overloaded with
10885 the `Slice` or `SliceMut` traits.
10886 * The syntax for matching of sub-slices has been changed to use a
10887 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10888 consistency with other uses of `..` and to future-proof
10889 potential additional uses of the syntax.
10890 * The syntax for matching inclusive ranges in patterns has changed
10891 from `0..3` to `0...4` to be consistent with the exclusive range
10892 syntax for slicing.
10893 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10894 c]`) has been put behind the 'advanced_slice_patterns' feature
10895 gate and may be removed in the future.
10896 * Components of tuples and tuple structs can be extracted using
10897 the `value.0` syntax, currently behind the `tuple_indexing`
10899 * The `#[crate_id]` attribute is no longer supported; versioning
10900 is handled by the package manager.
10901 * Renaming crate imports are now written `extern crate foo as bar`
10902 instead of `extern crate bar = foo`.
10903 * Renaming use statements are now written `use foo as bar` instead
10904 of `use bar = foo`.
10905 * `let` and `match` bindings and argument names in macros are now
10907 * The new, more efficient, closure types ('unboxed closures') have
10908 been added under a feature gate, 'unboxed_closures'. These will
10909 soon replace the existing closure types, once higher-ranked
10910 trait lifetimes are added to the language.
10911 * `move` has been added as a keyword, for indicating closures
10912 that capture by value.
10913 * Mutation and assignment is no longer allowed in pattern guards.
10914 * Generic structs and enums can now have trait bounds.
10915 * The `Share` trait is now called `Sync` to free up the term
10916 'shared' to refer to 'shared reference' (the default reference
10918 * Dynamically-sized types have been mostly implemented,
10919 unifying the behavior of fat-pointer types with the rest of the
10921 * As part of dynamically-sized types, the `Sized` trait has been
10922 introduced, which qualifying types implement by default, and
10923 which type parameters expect by default. To specify that a type
10924 parameter does not need to be sized, write `<Sized? T>`. Most
10925 types are `Sized`, notable exceptions being unsized arrays
10926 (`[T]`) and trait types.
10927 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10928 * Lifetime bounds can now be applied to type parameters and object
10930 * The old, reference counted GC type, `Gc<T>` which was once
10931 denoted by the `@` sigil, has finally been removed. GC will be
10932 revisited in the future.
10935 * Library documentation has been improved for a number of modules.
10936 * Bit-vectors, collections::bitv has been modernized.
10937 * The url crate is deprecated in favor of
10938 http://github.com/servo/rust-url, which can be installed with
10940 * Most I/O stream types can be cloned and subsequently closed from
10941 a different thread.
10942 * A `std::time::Duration` type has been added for use in I/O
10943 methods that rely on timers, as well as in the 'time' crate's
10944 `Timespec` arithmetic.
10945 * The runtime I/O abstraction layer that enabled the green thread
10946 scheduler to do non-thread-blocking I/O has been removed, along
10947 with the libuv-based implementation employed by the green thread
10948 scheduler. This will greatly simplify the future I/O work.
10949 * `collections::btree` has been rewritten to have a more
10950 idiomatic and efficient design.
10953 * rustdoc output now indicates the stability levels of API's.
10954 * The `--crate-name` flag can specify the name of the crate
10955 being compiled, like `#[crate_name]`.
10956 * The `-C metadata` specifies additional metadata to hash into
10957 symbol names, and `-C extra-filename` specifies additional
10958 information to put into the output filename, for use by the
10959 package manager for versioning.
10960 * debug info generation has continued to improve and should be
10961 more reliable under both gdb and lldb.
10962 * rustc has experimental support for compiling in parallel
10963 using the `-C codegen-units` flag.
10964 * rustc no longer encodes rpath information into binaries by
10968 * Stack usage has been optimized with LLVM lifetime annotations.
10969 * Official Rust binaries on Linux are more compatible with older
10970 kernels and distributions, built on CentOS 5.10.
10973 Version 0.11.0 (2014-07-02)
10974 ==========================
10976 * ~1700 changes, numerous bugfixes
10979 * ~[T] has been removed from the language. This type is superseded by
10981 * ~str has been removed from the language. This type is superseded by
10983 * ~T has been removed from the language. This type is superseded by the
10985 * @T has been removed from the language. This type is superseded by the
10986 standard library's std::gc::Gc<T> type.
10987 * Struct fields are now all private by default.
10988 * Vector indices and shift amounts are both required to be a `uint`
10989 instead of any integral type.
10990 * Byte character, byte string, and raw byte string literals are now all
10991 supported by prefixing the normal literal with a `b`.
10992 * Multiple ABIs are no longer allowed in an ABI string
10993 * The syntax for lifetimes on closures/procedures has been tweaked
10994 slightly: `<'a>|A, B|: 'b + K -> T`
10995 * Floating point modulus has been removed from the language; however it
10996 is still provided by a library implementation.
10997 * Private enum variants are now disallowed.
10998 * The `priv` keyword has been removed from the language.
10999 * A closure can no longer be invoked through a &-pointer.
11000 * The `use foo, bar, baz;` syntax has been removed from the language.
11001 * The transmute intrinsic no longer works on type parameters.
11002 * Statics now allow blocks/items in their definition.
11003 * Trait bounds are separated from objects with + instead of : now.
11004 * Objects can no longer be read while they are mutably borrowed.
11005 * The address of a static is now marked as insignificant unless the
11006 #[inline(never)] attribute is placed it.
11007 * The #[unsafe_destructor] attribute is now behind a feature gate.
11008 * Struct literals are no longer allowed in ambiguous positions such as
11009 if, while, match, and for..in.
11010 * Declaration of lang items and intrinsics are now feature-gated by
11012 * Integral literals no longer default to `int`, and floating point
11013 literals no longer default to `f64`. Literals must be suffixed with an
11014 appropriate type if inference cannot determine the type of the
11016 * The Box<T> type is no longer implicitly borrowed to &mut T.
11017 * Procedures are now required to not capture borrowed references.
11020 * The standard library is now a "facade" over a number of underlying
11021 libraries. This means that development on the standard library should
11022 be speedier due to smaller crates, as well as a clearer line between
11024 * A new library, libcore, lives under the standard library's facade
11025 which is Rust's "0-assumption" library, suitable for embedded and
11026 kernel development for example.
11027 * A regex crate has been added to the standard distribution. This crate
11028 includes statically compiled regular expressions.
11029 * The unwrap/unwrap_err methods on Result require a Show bound for
11030 better error messages.
11031 * The return types of the std::comm primitives have been centralized
11032 around the Result type.
11033 * A number of I/O primitives have gained the ability to time out their
11035 * A number of I/O primitives have gained the ability to close their
11036 reading/writing halves to cancel pending operations.
11037 * Reverse iterator methods have been removed in favor of `rev()` on
11038 their forward-iteration counterparts.
11039 * A bitflags! macro has been added to enable easy interop with C and
11040 management of bit flags.
11041 * A debug_assert! macro is now provided which is disabled when
11042 `--cfg ndebug` is passed to the compiler.
11043 * A graphviz crate has been added for creating .dot files.
11044 * The std::cast module has been migrated into std::mem.
11045 * The std::local_data api has been migrated from freestanding functions
11046 to being based on methods.
11047 * The Pod trait has been renamed to Copy.
11048 * jemalloc has been added as the default allocator for types.
11049 * The API for allocating memory has been changed to use proper alignment
11050 and sized deallocation
11051 * Connecting a TcpStream or binding a TcpListener is now based on a
11052 string address and a u16 port. This allows connecting to a hostname as
11054 * The Reader trait now contains a core method, read_at_least(), which
11055 correctly handles many repeated 0-length reads.
11056 * The process-spawning API is now centered around a builder-style
11058 * The :? printing qualifier has been moved from the standard library to
11059 an external libdebug crate.
11060 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
11061 have been renamed to Eq/Ord.
11062 * The select/plural methods have been removed from format!. The escapes
11063 for { and } have also changed from \{ and \} to {{ and }},
11065 * The TaskBuilder API has been re-worked to be a true builder, and
11066 extension traits for spawning native/green tasks have been added.
11069 * All breaking changes to the language or libraries now have their
11070 commit message annotated with `[breaking-change]` to allow for easy
11071 discovery of breaking changes.
11072 * The compiler will now try to suggest how to annotate lifetimes if a
11073 lifetime-related error occurs.
11074 * Debug info continues to be improved greatly with general bug fixes and
11075 better support for situations like link time optimization (LTO).
11076 * Usage of syntax extensions when cross-compiling has been fixed.
11077 * Functionality equivalent to GCC & Clang's -ffunction-sections,
11078 -fdata-sections and --gc-sections has been enabled by default
11079 * The compiler is now stricter about where it will load module files
11080 from when a module is declared via `mod foo;`.
11081 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
11082 Syntax extensions are now discovered via a "plugin registrar" type
11083 which will be extended in the future to other various plugins.
11084 * Lints have been restructured to allow for dynamically loadable lints.
11085 * A number of rustdoc improvements:
11086 * The HTML output has been visually redesigned.
11087 * Markdown is now powered by hoedown instead of sundown.
11088 * Searching heuristics have been greatly improved.
11089 * The search index has been reduced in size by a great amount.
11090 * Cross-crate documentation via `pub use` has been greatly improved.
11091 * Primitive types are now hyperlinked and documented.
11092 * Documentation has been moved from static.rust-lang.org/doc to
11094 * A new sandbox, play.rust-lang.org, is available for running and
11095 sharing rust code examples on-line.
11096 * Unused attributes are now more robustly warned about.
11097 * The dead_code lint now warns about unused struct fields.
11098 * Cross-compiling to iOS is now supported.
11099 * Cross-compiling to mipsel is now supported.
11100 * Stability attributes are now inherited by default and no longer apply
11101 to intra-crate usage, only inter-crate usage.
11102 * Error message related to non-exhaustive match expressions have been
11106 Version 0.10 (2014-04-03)
11107 =========================
11109 * ~1500 changes, numerous bugfixes
11112 * A new RFC process is now in place for modifying the language.
11113 * Patterns with `@`-pointers have been removed from the language.
11114 * Patterns with unique vectors (`~[T]`) have been removed from the
11116 * Patterns with unique strings (`~str`) have been removed from the
11118 * `@str` has been removed from the language.
11119 * `@[T]` has been removed from the language.
11120 * `@self` has been removed from the language.
11121 * `@Trait` has been removed from the language.
11122 * Headers on `~` allocations which contain `@` boxes inside the type for
11123 reference counting have been removed.
11124 * The semantics around the lifetimes of temporary expressions have changed,
11125 see #3511 and #11585 for more information.
11126 * Cross-crate syntax extensions are now possible, but feature gated. See
11127 #11151 for more information. This includes both `macro_rules!` macros as
11128 well as syntax extensions such as `format!`.
11129 * New lint modes have been added, and older ones have been turned on to be
11131 * Unnecessary parentheses
11132 * Uppercase statics
11134 * Uppercase variables
11135 * Publicly visible private types
11136 * `#[deriving]` with raw pointers
11137 * Unsafe functions can no longer be coerced to closures.
11138 * Various obscure macros such as `log_syntax!` are now behind feature gates.
11139 * The `#[simd]` attribute is now behind a feature gate.
11140 * Visibility is no longer allowed on `extern crate` statements, and
11141 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
11142 * Trailing commas are now allowed in argument lists and tuple patterns.
11143 * The `do` keyword has been removed, it is now a reserved keyword.
11144 * Default type parameters have been implemented, but are feature gated.
11145 * Borrowed variables through captures in closures are now considered soundly.
11146 * `extern mod` is now `extern crate`
11147 * The `Freeze` trait has been removed.
11148 * The `Share` trait has been added for types that can be shared among
11150 * Labels in macros are now hygienic.
11151 * Expression/statement macro invocations can be delimited with `{}` now.
11152 * Treatment of types allowed in `static mut` locations has been tweaked.
11153 * The `*` and `.` operators are now overloadable through the `Deref` and
11155 * `~Trait` and `proc` no longer have `Send` bounds by default.
11156 * Partial type hints are now supported with the `_` type marker.
11157 * An `Unsafe` type was introduced for interior mutability. It is now
11158 considered undefined to transmute from `&T` to `&mut T` without using the
11160 * The #[linkage] attribute was implemented for extern statics/functions.
11161 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
11162 * `Pod` was renamed to `Copy`.
11165 * The `libextra` library has been removed. It has now been decomposed into
11166 component libraries with smaller and more focused nuggets of
11167 functionality. The full list of libraries can be found on the
11168 documentation index page.
11169 * std: `std::condition` has been removed. All I/O errors are now propagated
11170 through the `Result` type. In order to assist with error handling, a
11171 `try!` macro for unwrapping errors with an early return and a lint for
11172 unused results has been added. See #12039 for more information.
11173 * std: The `vec` module has been renamed to `slice`.
11174 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
11175 This will become the only growable vector in the future.
11176 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
11177 are now found at `std::io::BufferedReader` instead of
11178 `std::io::buffered::BufferedReader`.
11179 * std: `print` and `println` are no longer in the prelude, the `print!` and
11180 `println!` macros are intended to be used instead.
11181 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
11182 attempts to statically prevent cycles.
11183 * std: The standard distribution is adopting the policy of pushing failure
11184 to the user rather than failing in libraries. Many functions (such as
11185 `slice::last()`) now return `Option<T>` instead of `T` + failing.
11186 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
11187 deriving mode: `#[deriving(Show)]`.
11188 * std: `ToStr` is now implemented for all types implementing `Show`.
11189 * std: The formatting trait methods now take `&self` instead of `&T`
11190 * std: The `invert()` method on iterators has been renamed to `rev()`
11191 * std: `std::num` has seen a reduction in the genericity of its traits,
11192 consolidating functionality into a few core traits.
11193 * std: Backtraces are now printed on task failure if the environment
11194 variable `RUST_BACKTRACE` is present.
11195 * std: Naming conventions for iterators have been standardized. More details
11196 can be found on the wiki's style guide.
11197 * std: `eof()` has been removed from the `Reader` trait. Specific types may
11198 still implement the function.
11199 * std: Networking types are now cloneable to allow simultaneous reads/writes.
11200 * std: `assert_approx_eq!` has been removed
11201 * std: The `e` and `E` formatting specifiers for floats have been added to
11202 print them in exponential notation.
11203 * std: The `Times` trait has been removed
11204 * std: Indications of variance and opting out of builtin bounds is done
11205 through marker types in `std::kinds::marker` now
11206 * std: `hash` has been rewritten, `IterBytes` has been removed, and
11207 `#[deriving(Hash)]` is now possible.
11208 * std: `SharedChan` has been removed, `Sender` is now cloneable.
11209 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
11210 * std: `Chan::new` is now `channel()`.
11211 * std: A new synchronous channel type has been implemented.
11212 * std: A `select!` macro is now provided for selecting over `Receiver`s.
11213 * std: `hashmap` and `trie` have been moved to `libcollections`
11214 * std: `run` has been rolled into `io::process`
11215 * std: `assert_eq!` now uses `{}` instead of `{:?}`
11216 * std: The equality and comparison traits have seen some reorganization.
11217 * std: `rand` has moved to `librand`.
11218 * std: `to_{lower,upper}case` has been implemented for `char`.
11219 * std: Logging has been moved to `liblog`.
11220 * collections: `HashMap` has been rewritten for higher performance and less
11222 * native: The default runtime is now `libnative`. If `libgreen` is desired,
11223 it can be booted manually. The runtime guide has more information and
11225 * native: All I/O functionality except signals has been implemented.
11226 * green: Task spawning with `libgreen` has been optimized with stack caching
11227 and various trimming of code.
11228 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
11229 * sync: The `extra::sync` module has been updated to modern rust (and moved
11230 to the `sync` library), tweaking and improving various interfaces while
11231 dropping redundant functionality.
11232 * sync: A new `Barrier` type has been added to the `sync` library.
11233 * sync: An efficient mutex for native and green tasks has been implemented.
11234 * serialize: The `base64` module has seen some improvement. It treats
11235 newlines better, has non-string error values, and has seen general
11237 * fourcc: A `fourcc!` macro was introduced
11238 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
11239 hexadecimal literal.
11242 * `rustpkg` has been deprecated and removed from the main repository. Its
11243 replacement, `cargo`, is under development.
11244 * Nightly builds of rust are now available
11245 * The memory usage of rustc has been improved many times throughout this
11247 * The build process supports disabling rpath support for the rustc binary
11249 * Code generation has improved in some cases, giving more information to the
11250 LLVM optimization passes to enable more extensive optimizations.
11251 * Debuginfo compatibility with lldb on OSX has been restored.
11252 * The master branch is now gated on an android bot, making building for
11253 android much more reliable.
11254 * Output flags have been centralized into one `--emit` flag.
11255 * Crate type flags have been centralized into one `--crate-type` flag.
11256 * Codegen flags have been consolidated behind a `-C` flag.
11257 * Linking against outdated crates now has improved error messages.
11258 * Error messages with lifetimes will often suggest how to annotate the
11259 function to fix the error.
11260 * Many more types are documented in the standard library, and new guides
11262 * Many `rustdoc` improvements:
11263 * code blocks are syntax highlighted.
11264 * render standalone markdown files.
11265 * the --test flag tests all code blocks by default.
11266 * exported macros are displayed.
11267 * re-exported types have their documentation inlined at the location of the
11269 * search works across crates that have been rendered to the same output
11273 Version 0.9 (2014-01-09)
11274 ==========================
11276 * ~1800 changes, numerous bugfixes
11279 * The `float` type has been removed. Use `f32` or `f64` instead.
11280 * A new facility for enabling experimental features (feature gating) has
11281 been added, using the crate-level `#[feature(foo)]` attribute.
11282 * Managed boxes (@) are now behind a feature gate
11283 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
11284 standard library's `Gc` or `Rc` types instead.
11285 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
11286 * Jumping back to the top of a loop is now done with `continue` instead of
11288 * Strings can no longer be mutated through index assignment.
11289 * Raw strings can be created via the basic `r"foo"` syntax or with matched
11290 hash delimiters, as in `r###"foo"###`.
11291 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
11293 * The `&fn` type is now written `|args| -> ret` to match the literal form.
11294 * `@fn`s have been removed.
11295 * `do` only works with procs in order to make it obvious what the cost
11297 * Single-element tuple-like structs can no longer be dereferenced to
11298 obtain the inner value. A more comprehensive solution for overloading
11299 the dereference operator will be provided in the future.
11300 * The `#[link(...)]` attribute has been replaced with
11301 `#[crate_id = "name#vers"]`.
11302 * Empty `impl`s must be terminated with empty braces and may not be
11303 terminated with a semicolon.
11304 * Keywords are no longer allowed as lifetime names; the `self` lifetime
11305 no longer has any special meaning.
11306 * The old `fmt!` string formatting macro has been removed.
11307 * `printf!` and `printfln!` (old-style formatting) removed in favor of
11308 `print!` and `println!`.
11309 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
11310 * The `extern mod foo (name = "bar")` syntax has been removed. Use
11311 `extern mod foo = "bar"` instead.
11312 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
11313 * Macros can have attributes.
11314 * Macros can expand to items with attributes.
11315 * Macros can expand to multiple items.
11316 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
11317 * Comments may be nested.
11318 * Values automatically coerce to trait objects they implement, without
11320 * Enum discriminants are no longer an entire word but as small as needed to
11321 contain all the variants. The `repr` attribute can be used to override
11322 the discriminant size, as in `#[repr(int)]` for integer-sized, and
11323 `#[repr(C)]` to match C enums.
11324 * Non-string literals are not allowed in attributes (they never worked).
11325 * The FFI now supports variadic functions.
11326 * Octal numeric literals, as in `0o7777`.
11327 * The `concat!` syntax extension performs compile-time string concatenation.
11328 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
11329 removed as Rust no longer uses segmented stacks.
11330 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
11331 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
11332 not `*`; ignoring remaining fields of a struct is also done with `..`,
11333 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
11334 * `rustc` supports the "win64" calling convention via `extern "win64"`.
11335 * `rustc` supports the "system" calling convention, which defaults to the
11336 preferred convention for the target platform, "stdcall" on 32-bit Windows,
11338 * The `type_overflow` lint (default: warn) checks literals for overflow.
11339 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11340 * The `attribute_usage` lint (default: warn) warns about unknown
11342 * The `unknown_features` lint (default: warn) warns about unknown
11344 * The `dead_code` lint (default: warn) checks for dead code.
11345 * Rust libraries can be linked statically to one another
11346 * `#[link_args]` is behind the `link_args` feature gate.
11347 * Native libraries are now linked with `#[link(name = "foo")]`
11348 * Native libraries can be statically linked to a rust crate
11349 (`#[link(name = "foo", kind = "static")]`).
11350 * Native OS X frameworks are now officially supported
11351 (`#[link(name = "foo", kind = "framework")]`).
11352 * The `#[thread_local]` attribute creates thread-local (not task-local)
11353 variables. Currently behind the `thread_local` feature gate.
11354 * The `return` keyword may be used in closures.
11355 * Types that can be copied via a memcpy implement the `Pod` kind.
11356 * The `cfg` attribute can now be used on struct fields and enum variants.
11359 * std: The `option` and `result` API's have been overhauled to make them
11360 simpler, more consistent, and more composable.
11361 * std: The entire `std::io` module has been replaced with one that is
11362 more comprehensive and that properly interfaces with the underlying
11363 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11365 * std: `io::util` contains a number of useful implementations of
11366 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11367 `ZeroReader`, `TeeReader`.
11368 * std: The reference counted pointer type `extra::rc` moved into std.
11369 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11370 just a wrapper around it).
11371 * std: The `Either` type has been removed.
11372 * std: `fmt::Default` can be implemented for any type to provide default
11373 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11374 * std: The `rand` API continues to be tweaked.
11375 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11376 on failure in gdb, is now named `rust_fail`.
11377 * std: The `each_key` and `each_value` methods on `HashMap` have been
11378 replaced by the `keys` and `values` iterators.
11379 * std: Functions dealing with type size and alignment have moved from the
11380 `sys` module to the `mem` module.
11381 * std: The `path` module was written and API changed.
11382 * std: `str::from_utf8` has been changed to cast instead of allocate.
11383 * std: `starts_with` and `ends_with` methods added to vectors via the
11384 `ImmutableEqVector` trait, which is in the prelude.
11385 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11386 if the index is out of bounds.
11387 * std: Task failure no longer propagates between tasks, as the model was
11388 complex, expensive, and incompatible with thread-based tasks.
11389 * std: The `Any` type can be used for dynamic typing.
11390 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11392 * std: Methods that produce iterators generally do not have an `_iter`
11394 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11395 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11396 * std: `util::ignore` renamed to `prelude::drop`.
11397 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11399 * std: `vec::raw` has seen a lot of cleanup and API changes.
11400 * std: The standard library no longer includes any C++ code, and very
11401 minimal C, eliminating the dependency on libstdc++.
11402 * std: Runtime scheduling and I/O functionality has been factored out into
11403 extensible interfaces and is now implemented by two different crates:
11404 libnative, for native threading and I/O; and libgreen, for green threading
11405 and I/O. This paves the way for using the standard library in more limited
11406 embedded environments.
11407 * std: The `comm` module has been rewritten to be much faster, have a
11408 simpler, more consistent API, and to work for both native and green
11410 * std: All libuv dependencies have been moved into the rustuv crate.
11411 * native: New implementations of runtime scheduling on top of OS threads.
11412 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11414 * green: The green thread scheduler and message passing types are almost
11415 entirely lock-free.
11416 * extra: The `flatpipes` module had bitrotted and was removed.
11417 * extra: All crypto functions have been removed and Rust now has a policy of
11418 not reimplementing crypto in the standard library. In the future crypto
11419 will be provided by external crates with bindings to established libraries.
11420 * extra: `c_vec` has been modernized.
11421 * extra: The `sort` module has been removed. Use the `sort` method on
11425 * The `rust` and `rusti` commands have been removed, due to lack of
11427 * `rustdoc` was completely rewritten.
11428 * `rustdoc` can test code examples in documentation.
11429 * `rustpkg` can test packages with the argument, 'test'.
11430 * `rustpkg` supports arbitrary dependencies, including C libraries.
11431 * `rustc`'s support for generating debug info is improved again.
11432 * `rustc` has better error reporting for unbalanced delimiters.
11433 * `rustc`'s JIT support was removed due to bitrot.
11434 * Executables and static libraries can be built with LTO (-Z lto)
11435 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11439 Version 0.8 (2013-09-26)
11440 ============================
11442 * ~2200 changes, numerous bugfixes
11445 * The `for` loop syntax has changed to work with the `Iterator` trait.
11446 * At long last, unwinding works on Windows.
11447 * Default methods are ready for use.
11448 * Many trait inheritance bugs fixed.
11449 * Owned and borrowed trait objects work more reliably.
11450 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11451 * rustc can omit emission of code for the `debug!` macro if it is passed
11453 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11454 for foo.rs, then foo/mod.rs, and will generate an error when both are
11456 * Strings no longer contain trailing nulls. The new `std::c_str` module
11457 provides new mechanisms for converting to C strings.
11458 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11459 * The FFI has been overhauled such that foreign functions are called directly,
11460 instead of through a stack-switching wrapper.
11461 * Calling a foreign function must be done through a Rust function with the
11462 `#[fixed_stack_segment]` attribute.
11463 * The `externfn!` macro can be used to declare both a foreign function and
11464 a `#[fixed_stack_segment]` wrapper at once.
11465 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11466 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11467 * `priv` is disallowed everywhere except for struct fields and enum variants.
11468 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11469 * `ref` bindings in irrefutable patterns work correctly now.
11470 * `char` is now prevented from containing invalid code points.
11471 * Casting to `bool` is no longer allowed.
11472 * `\0` is now accepted as an escape in chars and strings.
11473 * `yield` is a reserved keyword.
11474 * `typeof` is a reserved keyword.
11475 * Crates may be imported by URL with `extern mod foo = "url";`.
11476 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11477 * Static vectors can be initialized with repeating elements,
11478 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11479 * Static structs can be initialized with functional record update,
11480 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11481 * `cfg!` can be used to conditionally execute code based on the crate
11482 configuration, similarly to `#[cfg(...)]`.
11483 * The `unnecessary_qualification` lint detects unneeded module
11484 prefixes (default: allow).
11485 * Arithmetic operations have been implemented on the SIMD types in
11486 `std::unstable::simd`.
11487 * Exchange allocation headers were removed, reducing memory usage.
11488 * `format!` implements a completely new, extensible, and higher-performance
11489 string formatting system. It will replace `fmt!`.
11490 * `print!` and `println!` write formatted strings (using the `format!`
11491 extension) to stdout.
11492 * `write!` and `writeln!` write formatted strings (using the `format!`
11493 extension) to the new Writers in `std::rt::io`.
11494 * The library section in which a function or static is placed may
11495 be specified with `#[link_section = "..."]`.
11496 * The `proto!` syntax extension for defining bounded message protocols
11498 * `macro_rules!` is hygienic for `let` declarations.
11499 * The `#[export_name]` attribute specifies the name of a symbol.
11500 * `unreachable!` can be used to indicate unreachable code, and fails
11504 * std: Transitioned to the new runtime, written in Rust.
11505 * std: Added an experimental I/O library, `rt::io`, based on the new
11507 * std: A new generic `range` function was added to the prelude, replacing
11508 `uint::range` and friends.
11509 * std: `range_rev` no longer exists. Since range is an iterator it can be
11510 reversed with `range(lo, hi).invert()`.
11511 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11512 renamed to `unwrap_or`.
11513 * std: The `iterator` module was renamed to `iter`.
11514 * std: Integral types now support the `checked_add`, `checked_sub`, and
11515 `checked_mul` operations for detecting overflow.
11516 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11518 * std: Methods are standardizing on conventions for casting methods:
11519 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11521 * std: The `CString` type in `c_str` provides new ways to convert to and
11523 * std: `DoubleEndedIterator` can yield elements in two directions.
11524 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11526 * std: `str::from_bytes` renamed to `str::from_utf8`.
11527 * std: `pop_opt` and `shift_opt` methods added to vectors.
11528 * std: The task-local data interface no longer uses @, and keys are
11529 no longer function pointers.
11530 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11531 * std: Added `SharedPort` to `comm`.
11532 * std: `Eq` has a default method for `ne`; only `eq` is required
11533 in implementations.
11534 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11535 is required in implementations.
11536 * std: `is_utf8` performance is improved, impacting many string functions.
11537 * std: `os::MemoryMap` provides cross-platform mmap.
11538 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11539 are not 'in-bounds' are considered undefined.
11540 * std: Many freestanding functions in `vec` removed in favor of methods.
11541 * std: Many freestanding functions on scalar types removed in favor of
11543 * std: Many options to task builders were removed since they don't make
11544 sense in the new scheduler design.
11545 * std: More containers implement `FromIterator` so can be created by the
11547 * std: More complete atomic types in `unstable::atomics`.
11548 * std: `comm::PortSet` removed.
11549 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11550 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11551 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11552 default implementations.
11553 * std: Various `from_str` functions were removed in favor of a generic
11554 `from_str` which is available in the prelude.
11555 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11556 * extra: `dlist`, the doubly-linked list was modernized.
11557 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11558 * extra: Added `glob` module, replacing `std::os::glob`.
11559 * extra: `rope` was removed.
11560 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11561 * extra: `net`, and `timer` were removed. The experimental replacements
11562 are `std::rt::io::net` and `std::rt::io::timer`.
11563 * extra: Iterators implemented for `SmallIntMap`.
11564 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11565 * extra: `SmallIntSet` removed. Use `BitvSet`.
11566 * extra: Performance of JSON parsing greatly improved.
11567 * extra: `semver` updated to SemVer 2.0.0.
11568 * extra: `term` handles more terminals correctly.
11569 * extra: `dbg` module removed.
11570 * extra: `par` module removed.
11571 * extra: `future` was cleaned up, with some method renames.
11572 * extra: Most free functions in `getopts` were converted to methods.
11575 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11576 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11577 similarly to gcc's `--march` flag.
11578 * rustc's performance compiling small crates is much better.
11579 * rustpkg has received many improvements.
11580 * rustpkg supports git tags as package IDs.
11581 * rustpkg builds into target-specific directories so it can be used for
11583 * The number of concurrent test tasks is controlled by the environment
11584 variable RUST_TEST_TASKS.
11585 * The test harness can now report metrics for benchmarks.
11586 * All tools have man pages.
11587 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11588 * The runtime uses jemalloc for allocations.
11589 * Segmented stacks are temporarily disabled as part of the transition to
11590 the new runtime. Stack overflows are possible!
11591 * A new documentation backend, rustdoc_ng, is available for use. It is
11592 still invoked through the normal `rustdoc` command.
11595 Version 0.7 (2013-07-03)
11596 =======================
11598 * ~2000 changes, numerous bugfixes
11601 * `impl`s no longer accept a visibility qualifier. Put them on methods
11603 * The borrow checker has been rewritten with flow-sensitivity, fixing
11604 many bugs and inconveniences.
11605 * The `self` parameter no longer implicitly means `&'self self`,
11606 and can be explicitly marked with a lifetime.
11607 * Overloadable compound operators (`+=`, etc.) have been temporarily
11608 removed due to bugs.
11609 * The `for` loop protocol now requires `for`-iterators to return `bool`
11610 so they compose better.
11611 * The `Durable` trait is replaced with the `'static` bounds.
11612 * Trait default methods work more often.
11613 * Structs with the `#[packed]` attribute have byte alignment and
11614 no padding between fields.
11615 * Type parameters bound by `Copy` must now be copied explicitly with
11616 the `copy` keyword.
11617 * It is now illegal to move out of a dereferenced unsafe pointer.
11618 * `Option<~T>` is now represented as a nullable pointer.
11619 * `@mut` does dynamic borrow checks correctly.
11620 * The `main` function is only detected at the topmost level of the crate.
11621 The `#[main]` attribute is still valid anywhere.
11622 * Struct fields may no longer be mutable. Use inherited mutability.
11623 * The `#[no_send]` attribute makes a type that would otherwise be
11625 * The `#[no_freeze]` attribute makes a type that would otherwise be
11627 * Unbounded recursion will abort the process after reaching the limit
11628 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11629 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11630 are never implicitly copyable.
11631 * `#[static_assert]` makes compile-time assertions about static bools.
11632 * At long last, 'argument modes' no longer exist.
11633 * The rarely used `use mod` statement no longer exists.
11635 * Syntax extensions
11636 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11638 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11639 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11640 `#[deriving(...)]`.
11641 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11642 and unsuffixed integer literals.
11645 * The `core` crate was renamed to `std`.
11646 * The `std` crate was renamed to `extra`.
11647 * More and improved documentation.
11648 * std: `iterator` module for external iterator objects.
11649 * Many old-style (internal, higher-order function) iterators replaced by
11650 implementations of `Iterator`.
11651 * std: Many old internal vector and string iterators,
11652 incl. `any`, `all`. removed.
11653 * std: The `finalize` method of `Drop` renamed to `drop`.
11654 * std: The `drop` method now takes `&mut self` instead of `&self`.
11655 * std: The prelude no longer re-exports any modules, only types and traits.
11656 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11657 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11658 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11659 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11660 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11661 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11662 * std: Many types implement `Clone`.
11663 * std: `path` type renamed to `Path`.
11664 * std: `mut` module and `Mut` type removed.
11665 * std: Many standalone functions removed in favor of methods and iterators
11666 in `vec`, `str`. In the future methods will also work as functions.
11667 * std: `reinterpret_cast` removed. Use `transmute`.
11668 * std: ascii string handling in `std::ascii`.
11669 * std: `Rand` is implemented for ~/@.
11670 * std: `run` module for spawning processes overhauled.
11671 * std: Various atomic types added to `unstable::atomic`.
11672 * std: Various types implement `Zero`.
11673 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11674 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11675 * std: Added `os::mkdir_recursive`.
11676 * std: Added `os::glob` function performs filesystems globs.
11677 * std: `FuzzyEq` renamed to `ApproxEq`.
11678 * std: `Map` now defines `pop` and `swap` methods.
11679 * std: `Cell` constructors converted to static methods.
11680 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11681 * extra: `flate` module moved from `std` to `extra`.
11682 * extra: `fileinput` module for iterating over a series of files.
11683 * extra: `Complex` number type and `complex` module.
11684 * extra: `Rational` number type and `rational` module.
11685 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11686 * extra: `term` uses terminfo now, is more correct.
11687 * extra: `arc` functions converted to methods.
11688 * extra: Implementation of fixed output size variations of SHA-2.
11691 * `unused_variables` lint mode for unused variables (default: warn).
11692 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11694 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11696 * `dead_assignment` lint mode for unread variables (default: warn).
11697 * `unnecessary_allocation` lint mode detects some heap allocations that are
11698 immediately borrowed so could be written without allocating (default: warn).
11699 * `missing_doc` lint mode (default: allow).
11700 * `unreachable_code` lint mode (default: warn).
11701 * The `rusti` command has been rewritten and a number of bugs addressed.
11702 * rustc outputs in color on more terminals.
11703 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11704 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11705 * Compiling with `-g` will make the binary record information about
11706 dynamic borrowcheck failures for debugging.
11707 * rustdoc has a nicer stylesheet.
11708 * Various improvements to rustdoc.
11709 * Improvements to rustpkg (see the detailed release notes).
11712 Version 0.6 (2013-04-03)
11713 ========================
11715 * ~2100 changes, numerous bugfixes
11718 * The self type parameter in traits is now spelled `Self`
11719 * The `self` parameter in trait and impl methods must now be explicitly
11720 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11721 * Static methods no longer require the `static` keyword and instead
11722 are distinguished by the lack of a `self` parameter
11723 * Replaced the `Durable` trait with the `'static` lifetime
11724 * The old closure type syntax with the trailing sigil has been
11725 removed in favor of the more consistent leading sigil
11726 * `super` is a keyword, and may be prefixed to paths
11727 * Trait bounds are separated with `+` instead of whitespace
11728 * Traits are implemented with `impl Trait for Type`
11729 instead of `impl Type: Trait`
11730 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11731 * The `export` keyword has finally been removed
11732 * The `move` keyword has been removed (see "Semantic changes")
11733 * The interior mutability qualifier on vectors, `[mut T]`, has been
11734 removed. Use `&mut [T]`, etc.
11735 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11736 * `fail` is no longer a keyword. Use `fail!()`
11737 * `assert` is no longer a keyword. Use `assert!()`
11738 * `log` is no longer a keyword. use `debug!`, etc.
11739 * 1-tuples may be represented as `(T,)`
11740 * Struct fields may no longer be `mut`. Use inherited mutability,
11741 `@mut T`, `core::mut` or `core::cell`
11742 * `extern mod { ... }` is no longer valid syntax for foreign
11743 function modules. Use extern blocks: `extern { ... }`
11744 * Newtype enums removed. Use tuple-structs.
11745 * Trait implementations no longer support visibility modifiers
11746 * Pattern matching over vectors improved and expanded
11747 * `const` renamed to `static` to correspond to lifetime name,
11748 and make room for future `static mut` unsafe mutable globals.
11749 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11750 * `Clone` implementations can be automatically generated with
11751 `#[deriving(Clone)]`
11752 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11753 instead of `foo as Bar`.
11754 * Fixed length vector types are now written as `[int, .. 3]`
11755 instead of `[int * 3]`.
11756 * Fixed length vector types can express the length as a constant
11757 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11760 * Types with owned pointers or custom destructors move by default,
11761 eliminating the `move` keyword
11762 * All foreign functions are considered unsafe
11763 * &mut is now unaliasable
11764 * Writes to borrowed @mut pointers are prevented dynamically
11766 * The name of the main function can be customized using #[main]
11767 * The default type of an inferred closure is &fn instead of @fn
11768 * `use` statements may no longer be "chained" - they cannot import
11769 identifiers imported by previous `use` statements
11770 * `use` statements are crate relative, importing from the "top"
11771 of the crate by default. Paths may be prefixed with `super::`
11772 or `self::` to change the search behavior.
11773 * Method visibility is inherited from the implementation declaration
11774 * Structural records have been removed
11775 * Many more types can be used in static items, including enums
11776 'static-lifetime pointers and vectors
11777 * Pattern matching over vectors improved and expanded
11778 * Typechecking of closure types has been overhauled to
11779 improve inference and eliminate unsoundness
11780 * Macros leave scope at the end of modules, unless that module is
11781 tagged with #[macro_escape]
11784 * Added big integers to `std::bigint`
11785 * Removed `core::oldcomm` module
11786 * Added pipe-based `core::comm` module
11787 * Numeric traits have been reorganized under `core::num`
11788 * `vec::slice` finally returns a slice
11789 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11790 * Containers reorganized around traits in `core::container`
11791 * `core::dvec` removed, `~[T]` is a drop-in replacement
11792 * `core::send_map` renamed to `core::hashmap`
11793 * `std::map` removed; replaced with `core::hashmap`
11794 * `std::treemap` reimplemented as an owned balanced tree
11795 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11796 * `core::trie` added as a fast ordered map for integer keys
11797 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11798 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11799 overload the comparison operators, whereas `TotalOrd` is used
11800 by certain container types
11803 * Replaced the 'cargo' package manager with 'rustpkg'
11804 * Added all-purpose 'rust' tool
11805 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11806 * rustc now *attempts* to offer spelling suggestions
11807 * Improved support for ARM and Android
11808 * Preliminary MIPS backend
11809 * Improved foreign function ABI implementation for x86, x86_64
11810 * Various memory usage improvements
11811 * Rust code may be embedded in foreign code under limited circumstances
11812 * Inline assembler supported by new asm!() syntax extension.
11815 Version 0.5 (2012-12-21)
11816 ===========================
11818 * ~900 changes, numerous bugfixes
11821 * Removed `<-` move operator
11822 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11823 * Removed old fixed length vector syntax - `[T]/N`
11824 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11825 * Macros may now expand to items and statements
11826 * `a.b()` is always parsed as a method call, never as a field projection
11827 * `Eq` and `IterBytes` implementations can be automatically generated
11828 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11829 * Removed the special crate language for `.rc` files
11830 * Function arguments may consist of any irrefutable pattern
11833 * `&` and `~` pointers may point to objects
11834 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11835 * Enum variants may be structs
11836 * Destructors can be added to all nominal types with the Drop trait
11837 * Structs and nullary enum variants may be constants
11838 * Values that cannot be implicitly copied are now automatically moved
11839 without writing `move` explicitly
11840 * `&T` may now be coerced to `*T`
11841 * Coercions happen in `let` statements as well as function calls
11842 * `use` statements now take crate-relative paths
11843 * The module and type namespaces have been merged so that static
11844 method names can be resolved under the trait in which they are
11847 * Improved support for language features
11848 * Trait inheritance works in many scenarios
11849 * More support for explicit self arguments in methods - `self`, `&self`
11850 `@self`, and `~self` all generally work as expected
11851 * Static methods work in more situations
11852 * Experimental: Traits may declare default methods for the implementations
11856 * New condition handling system in `core::condition`
11857 * Timsort added to `std::sort`
11858 * New priority queue, `std::priority_queue`
11859 * Pipes for serializable types, `std::flatpipes'
11860 * Serialization overhauled to be trait-based
11861 * Expanded `getopts` definitions
11862 * Moved futures to `std`
11863 * More functions are pure now
11864 * `core::comm` renamed to `oldcomm`. Still deprecated
11865 * `rustdoc` and `cargo` are libraries now
11868 * Added a preliminary REPL, `rusti`
11869 * License changed from MIT to dual MIT/APL2
11872 Version 0.4 (2012-10-15)
11873 ==========================
11875 * ~2000 changes, numerous bugfixes
11878 * All keywords are now strict and may not be used as identifiers anywhere
11879 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11880 'of', 'with', 'to', 'class'.
11881 * Classes are replaced with simpler structs
11882 * Explicit method self types
11883 * `ret` became `return` and `alt` became `match`
11884 * `import` is now `use`; `use is now `extern mod`
11885 * `extern mod { ... }` is now `extern { ... }`
11886 * `use mod` is the recommended way to import modules
11887 * `pub` and `priv` replace deprecated export lists
11888 * The syntax of `match` pattern arms now uses fat arrow (=>)
11889 * `main` no longer accepts an args vector; use `os::args` instead
11892 * Trait implementations are now coherent, ala Haskell typeclasses
11893 * Trait methods may be static
11894 * Argument modes are deprecated
11895 * Borrowed pointers are much more mature and recommended for use
11896 * Strings and vectors in the static region are stored in constant memory
11897 * Typestate was removed
11898 * Resolution rewritten to be more reliable
11899 * Support for 'dual-mode' data structures (freezing and thawing)
11902 * Most binary operators can now be overloaded via the traits in
11904 * `std::net::url` for representing URLs
11905 * Sendable hash maps in `core::send_map`
11906 * `core::task' gained a (currently unsafe) task-local storage API
11909 * An efficient new intertask communication primitive called the pipe,
11910 along with a number of higher-level channel types, in `core::pipes`
11911 * `std::arc`, an atomically reference counted, immutable, shared memory
11913 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11914 * Futures are now based on pipes and sendable
11915 * More robust linked task failure
11916 * Improved task builder API
11919 * Improved error reporting
11920 * Preliminary JIT support
11921 * Preliminary work on precise GC
11922 * Extensive architectural improvements to rustc
11923 * Begun a transition away from buggy C++-based reflection (shape) code to
11924 Rust-based (visitor) code
11925 * All hash functions and tables converted to secure, randomized SipHash
11928 Version 0.3 (2012-07-12)
11929 ========================
11931 * ~1900 changes, numerous bugfixes
11933 * New coding conveniences
11934 * Integer-literal suffix inference
11935 * Per-item control over warnings, errors
11936 * #[cfg(windows)] and #[cfg(unix)] attributes
11937 * Documentation comments
11938 * More compact closure syntax
11939 * 'do' expressions for treating higher-order functions as
11941 * *-patterns (wildcard extended to all constructor fields)
11944 * Name resolution pass and exhaustiveness checker rewritten
11945 * Region pointers and borrow checking supersede alias
11947 * Init-ness checking is now provided by a region-based liveness
11948 pass instead of the typestate pass; same for last-use analysis
11949 * Extensive work on region pointers
11951 * Experimental new language features
11952 * Slices and fixed-size, interior-allocated vectors
11953 * #!-comments for lang versioning, shell execution
11954 * Destructors and iface implementation for classes;
11955 type-parameterized classes and class methods
11956 * 'const' type kind for types that can be used to implement
11957 shared-memory concurrency patterns
11961 * Removal of various obsolete features
11962 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11963 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11965 * Constructs: do-while loops ('do' repurposed), fn binding,
11966 resources (replaced by destructors)
11968 * Compiler reorganization
11969 * Syntax-layer of compiler split into separate crate
11970 * Clang (from LLVM project) integrated into build
11971 * Typechecker split into sub-modules
11974 * New time functions
11975 * Extension methods for many built-in types
11976 * Arc: atomic-refcount read-only / exclusive-use shared cells
11977 * Par: parallel map and search routines
11978 * Extensive work on libuv interface
11979 * Much vector code moved to libraries
11980 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11981 #include, #include_str, #include_bin
11983 * Tool improvements
11984 * Cargo automatically resolves dependencies
11987 Version 0.2 (2012-03-29)
11988 =========================
11990 * >1500 changes, numerous bugfixes
11992 * New docs and doc tooling
11994 * New port: FreeBSD x86_64
11996 * Compilation model enhancements
11997 * Generics now specialized, multiply instantiated
11998 * Functions now inlined across separate crates
12000 * Scheduling, stack and threading fixes
12001 * Noticeably improved message-passing performance
12002 * Explicit schedulers
12006 * Experimental new language features
12007 * Operator overloading
12011 * Various language extensions
12012 * C-callback function types: 'crust fn ...'
12013 * Infinite-loop construct: 'loop { ... }'
12014 * Shorten 'mutable' to 'mut'
12015 * Required mutable-local qualifier: 'let mut ...'
12016 * Basic glob-exporting: 'export foo::*;'
12017 * Alt now exhaustive, 'alt check' for runtime-checked
12018 * Block-function form of 'for' loop, with 'break' and 'ret'.
12021 * AST quasi-quote syntax extension
12022 * Revived libuv interface
12023 * New modules: core::{future, iter}, std::arena
12024 * Merged per-platform std::{os*, fs*} to core::{libc, os}
12025 * Extensive cleanup, regularization in libstd, libcore
12028 Version 0.1 (2012-01-20)
12029 ===============================
12031 * Most language features work, including:
12032 * Unique pointers, unique closures, move semantics
12033 * Interface-constrained generics
12034 * Static interface dispatch
12036 * Multithread task scheduling
12037 * Typestate predicates
12038 * Failure unwinding, destructors
12039 * Pattern matching and destructuring assignment
12040 * Lightweight block-lambda syntax
12041 * Preliminary macro-by-example
12043 * Compiler works with the following configurations:
12044 * Linux: x86 and x86_64 hosts and targets
12045 * macOS: x86 and x86_64 hosts and targets
12046 * Windows: x86 hosts and targets
12048 * Cross compilation / multi-target configuration supported.
12050 * Preliminary API-documentation and package-management tools included.
12054 * Documentation is incomplete.
12056 * Performance is below intended target.
12058 * Standard library APIs are subject to extensive change, reorganization.
12060 * Language-level versioning is not yet operational - future code will
12061 break unexpectedly.