1 Version 1.39.0 (2019-11-07)
2 ===========================
6 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
7 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
8 - [You can now use certain attributes on function, closure, and function pointer
9 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
10 `deny`, `forbid` as well as inert helper attributes used by procedural macro
11 attributes applied to items. e.g.
14 #[cfg(windows)] slice: &[u16],
15 #[cfg(not(windows))] slice: &[u8],
20 - [You can now take shared references to bind-by-move patterns in the `if` guards
21 of `match` arms.][63118] e.g.
24 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
28 // ---- `nums` is bound by move.
29 if nums.iter().sum::<u8>() == 10
30 // ^------ `.iter()` implicitly takes a reference to `nums`.
33 // ----------- Legal as `nums` was bound by move and so we have ownership.
44 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
45 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
46 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
47 **Note** Cargo currently doesn't use this feature. Refer to
48 [cargo#7315][cargo/7315] to track this feature's progress.
49 - [You can now pass `--show-output` argument to test binaries to print the
50 output of successful tests.][62600]
53 \* Refer to Rust's [platform support page][forge-platform-support] for more
54 information on Rust's tiered platform support.
58 - [`Vec::new` and `String::new` are now `const` functions.][64028]
59 - [`LinkedList::new` is now a `const` function.][63684]
60 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
61 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
67 - [`Instant::checked_duration_since`]
68 - [`Instant::saturating_duration_since`]
72 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
73 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
74 `--all` is now deprecated.
78 - [You can now pass `-Clinker` to rustdoc to control the linker used
79 for compiling doctests.][63834]
83 - [Code that was previously accepted by the old borrow checker, but rejected by
84 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
85 previously a warning, and will also become a hard error in the Rust 2015
86 edition in the 1.40.0 release.
87 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
88 run tests.][63827] This should improve performance when running a large
90 - [The `try!` macro will now issue a deprecation warning.][62672] It is
91 recommended to use the `?` operator instead.
92 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
95 [62600]: https://github.com/rust-lang/rust/pull/62600/
96 [62672]: https://github.com/rust-lang/rust/pull/62672/
97 [63118]: https://github.com/rust-lang/rust/pull/63118/
98 [63209]: https://github.com/rust-lang/rust/pull/63209/
99 [63402]: https://github.com/rust-lang/rust/pull/63402/
100 [63565]: https://github.com/rust-lang/rust/pull/63565/
101 [63595]: https://github.com/rust-lang/rust/pull/63595/
102 [63684]: https://github.com/rust-lang/rust/pull/63684/
103 [63698]: https://github.com/rust-lang/rust/pull/63698/
104 [63770]: https://github.com/rust-lang/rust/pull/63770/
105 [63786]: https://github.com/rust-lang/rust/pull/63786/
106 [63827]: https://github.com/rust-lang/rust/pull/63827/
107 [63834]: https://github.com/rust-lang/rust/pull/63834/
108 [63927]: https://github.com/rust-lang/rust/pull/63927/
109 [63933]: https://github.com/rust-lang/rust/pull/63933/
110 [63934]: https://github.com/rust-lang/rust/pull/63934/
111 [63938]: https://github.com/rust-lang/rust/pull/63938/
112 [63940]: https://github.com/rust-lang/rust/pull/63940/
113 [63941]: https://github.com/rust-lang/rust/pull/63941/
114 [63945]: https://github.com/rust-lang/rust/pull/63945/
115 [64010]: https://github.com/rust-lang/rust/pull/64010/
116 [64028]: https://github.com/rust-lang/rust/pull/64028/
117 [64334]: https://github.com/rust-lang/rust/pull/64334/
118 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
119 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
120 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
121 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
122 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
123 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
125 Version 1.38.0 (2019-09-26)
126 ==========================
130 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
131 - [The `#[deprecated]` attribute can now be used on macros.][62042]
135 - [Added pipelined compilation support to `rustc`.][62766] This will
136 improve compilation times in some cases. For further information please refer
137 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
138 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
139 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
140 `x86_64-uwp-windows-msvc` targets.][60260]
141 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
142 `armv7-unknown-linux-musleabi` targets.][63107]
143 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
144 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
146 \* Refer to Rust's [platform support page][forge-platform-support] for more
147 information on Rust's tiered platform support.
151 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
152 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
153 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
154 is available at `std::clone::Clone`). This also makes all built-in macros
155 available in `std`/`core` root. e.g. `std::include_bytes!`.
156 - [`str::Chars` now implements `Debug`.][63000]
157 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
158 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
159 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
160 - [Added euclidean remainder and division operations (`div_euclid`,
161 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
162 `overflowing`, and `wrapping` versions are available for all
164 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
166 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
170 - [`<*const T>::cast`]
172 - [`Duration::as_secs_f32`]
173 - [`Duration::as_secs_f64`]
174 - [`Duration::div_f32`]
175 - [`Duration::div_f64`]
176 - [`Duration::from_secs_f32`]
177 - [`Duration::from_secs_f64`]
178 - [`Duration::mul_f32`]
179 - [`Duration::mul_f64`]
184 - [Added pipelined compilation support to `cargo`.][cargo/7143]
185 - [You can now pass the `--features` option multiple times to enable
186 multiple features.][cargo/7084]
190 - [`rustc` will now warn about some incorrect uses of
191 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
195 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
197 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
198 issues][62896] with certain crates such as libc.
200 [60260]: https://github.com/rust-lang/rust/pull/60260/
201 [61457]: https://github.com/rust-lang/rust/pull/61457/
202 [61491]: https://github.com/rust-lang/rust/pull/61491/
203 [61884]: https://github.com/rust-lang/rust/pull/61884/
204 [61953]: https://github.com/rust-lang/rust/pull/61953/
205 [62042]: https://github.com/rust-lang/rust/pull/62042/
206 [62528]: https://github.com/rust-lang/rust/pull/62528/
207 [62583]: https://github.com/rust-lang/rust/pull/62583/
208 [62735]: https://github.com/rust-lang/rust/pull/62735/
209 [62766]: https://github.com/rust-lang/rust/pull/62766/
210 [62784]: https://github.com/rust-lang/rust/pull/62784/
211 [62785]: https://github.com/rust-lang/rust/issues/62785/
212 [62814]: https://github.com/rust-lang/rust/pull/62814/
213 [62896]: https://github.com/rust-lang/rust/issues/62896/
214 [63000]: https://github.com/rust-lang/rust/pull/63000/
215 [63056]: https://github.com/rust-lang/rust/pull/63056/
216 [63107]: https://github.com/rust-lang/rust/pull/63107/
217 [63346]: https://github.com/rust-lang/rust/pull/63346/
218 [63421]: https://github.com/rust-lang/rust/pull/63421/
219 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
220 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
221 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
222 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
223 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
224 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
225 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
226 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
227 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
228 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
229 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
230 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
231 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
232 [forge-platform-support]: https://forge.rust-lang.org/platform-support.html
233 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
235 Version 1.37.0 (2019-08-15)
236 ==========================
240 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
241 [`Box`][62228], or an [array][62235] and unused.
242 - [You can now use the `cfg` and `cfg_attr` attributes on
243 generic parameters.][61547]
244 - [You can now use enum variants through type alias.][61682] e.g. You can
247 type MyOption = Option<u8>;
249 fn increment_or_zero(x: MyOption) -> u8 {
251 MyOption::Some(y) => y + 1,
256 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
258 - [You can now use `#[repr(align(X)]` on enums.][61229]
259 - [The `?` Kleene macro operator is now available in the
260 2015 edition.][60932]
264 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
265 and `-C profile-use` flags.][61268] For more information on how to use profile
266 guided optimization, please refer to the [rustc book][rustc-book-pgo].
267 - [The `rust-lldb` wrapper script should now work again.][61827]
271 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
275 - [`BufReader::buffer`]
276 - [`BufWriter::buffer`]
278 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
279 - [`DoubleEndedIterator::nth_back`]
281 - [`Wrapping::reverse_bits`]
282 - [`i128::reverse_bits`]
283 - [`i16::reverse_bits`]
284 - [`i32::reverse_bits`]
285 - [`i64::reverse_bits`]
286 - [`i8::reverse_bits`]
287 - [`isize::reverse_bits`]
288 - [`slice::copy_within`]
289 - [`u128::reverse_bits`]
290 - [`u16::reverse_bits`]
291 - [`u32::reverse_bits`]
292 - [`u64::reverse_bits`]
293 - [`u8::reverse_bits`]
294 - [`usize::reverse_bits`]
298 - [`Cargo.lock` files are now included by default when publishing executable crates
299 with executables.][cargo/7026]
300 - [You can now specify `default-run="foo"` in `[package]` to specify the
301 default executable to use for `cargo run`.][cargo/7056]
308 - [Using `...` for inclusive range patterns will now warn by default.][61342]
309 Please transition your code to using the `..=` syntax for inclusive
311 - [Using a trait object without the `dyn` will now warn by default.][61203]
312 Please transition your code to use `dyn Trait` for trait objects instead.
314 [62228]: https://github.com/rust-lang/rust/pull/62228/
315 [62235]: https://github.com/rust-lang/rust/pull/62235/
316 [61802]: https://github.com/rust-lang/rust/pull/61802/
317 [61827]: https://github.com/rust-lang/rust/pull/61827/
318 [61547]: https://github.com/rust-lang/rust/pull/61547/
319 [61682]: https://github.com/rust-lang/rust/pull/61682/
320 [61268]: https://github.com/rust-lang/rust/pull/61268/
321 [61342]: https://github.com/rust-lang/rust/pull/61342/
322 [61347]: https://github.com/rust-lang/rust/pull/61347/
323 [61100]: https://github.com/rust-lang/rust/pull/61100/
324 [61203]: https://github.com/rust-lang/rust/pull/61203/
325 [61229]: https://github.com/rust-lang/rust/pull/61229/
326 [60932]: https://github.com/rust-lang/rust/pull/60932/
327 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
328 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
329 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
330 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
331 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
332 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
333 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
334 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
335 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
336 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
337 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
338 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
339 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
340 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
341 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
342 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
343 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
344 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
345 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
346 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
347 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
348 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
349 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
350 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
353 Version 1.36.0 (2019-07-04)
354 ==========================
358 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
359 - [The order of traits in trait objects no longer affects the semantics of that
360 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
361 `dyn fmt::Debug + Send`, where this was previously not the case.
365 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
366 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
367 - [`mem::needs_drop` is now available as a const fn.][60364]
368 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
369 - [`String` now implements `BorrowMut<str>`.][60404]
370 - [`io::Cursor` now implements `Default`.][60234]
371 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
372 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
373 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
374 environment has access to heap memory allocation.
375 - [`String` now implements `From<&String>`.][59825]
376 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
377 return a tuple of each argument when there is multiple arguments.
378 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
383 - [`VecDeque::rotate_left`]
384 - [`VecDeque::rotate_right`]
385 - [`Iterator::copied`]
388 - [`Read::read_vectored`]
389 - [`Write::write_vectored`]
390 - [`str::as_mut_ptr`]
391 - [`mem::MaybeUninit`]
392 - [`pointer::align_offset`]
396 - [`task::RawWakerVTable`]
402 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
403 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
405 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
409 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
416 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
417 longer recommended, and will be deprecated in 1.39.0.
419 [60318]: https://github.com/rust-lang/rust/pull/60318/
420 [60364]: https://github.com/rust-lang/rust/pull/60364/
421 [60370]: https://github.com/rust-lang/rust/pull/60370/
422 [60404]: https://github.com/rust-lang/rust/pull/60404/
423 [60234]: https://github.com/rust-lang/rust/pull/60234/
424 [60244]: https://github.com/rust-lang/rust/pull/60244/
425 [58623]: https://github.com/rust-lang/rust/pull/58623/
426 [59648]: https://github.com/rust-lang/rust/pull/59648/
427 [59675]: https://github.com/rust-lang/rust/pull/59675/
428 [59825]: https://github.com/rust-lang/rust/pull/59825/
429 [59826]: https://github.com/rust-lang/rust/pull/59826/
430 [59445]: https://github.com/rust-lang/rust/pull/59445/
431 [59114]: https://github.com/rust-lang/rust/pull/59114/
432 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
433 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
434 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
435 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
436 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
437 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
438 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
439 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
440 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
441 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
442 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
443 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
444 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
445 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
446 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
447 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
448 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
449 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
450 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
451 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
454 Version 1.35.0 (2019-05-23)
455 ==========================
459 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
460 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
461 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
463 unsafe fn call_unsafe(func: unsafe fn()) {
468 unsafe { call_unsafe(|| {}); }
475 - [Added the `armv6-unknown-freebsd-gnueabihf` and
476 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
477 - [Added the `wasm32-unknown-wasi` target.][59464]
482 - [`Thread` will now show its ID in `Debug` output.][59460]
483 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
484 - [`alloc::System` now implements `Default`.][59451]
485 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
487 - [`char::{ToLowercase, ToUppercase}` now
488 implement `ExactSizeIterator`.][58778]
489 - [All `NonZero` numeric types now implement `FromStr`.][58717]
490 - [Removed the `Read` trait bounds
491 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
492 - [You can now call the `dbg!` macro without any parameters to print the file
493 and line where it is called.][57847]
494 - [In place ASCII case conversions are now up to 4× faster.][59283]
495 e.g. `str::make_ascii_lowercase`
496 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
503 - [`RefCell::replace_with`]
504 - [`RefCell::map_split`]
506 - [`Range::contains`]
507 - [`RangeFrom::contains`]
508 - [`RangeTo::contains`]
509 - [`RangeInclusive::contains`]
510 - [`RangeToInclusive::contains`]
515 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
516 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
521 - [The Rust toolchain is now available natively for musl based distros.][58575]
523 [59460]: https://github.com/rust-lang/rust/pull/59460/
524 [59464]: https://github.com/rust-lang/rust/pull/59464/
525 [59500]: https://github.com/rust-lang/rust/pull/59500/
526 [59512]: https://github.com/rust-lang/rust/pull/59512/
527 [59580]: https://github.com/rust-lang/rust/pull/59580/
528 [59283]: https://github.com/rust-lang/rust/pull/59283/
529 [59451]: https://github.com/rust-lang/rust/pull/59451/
530 [59076]: https://github.com/rust-lang/rust/pull/59076/
531 [58778]: https://github.com/rust-lang/rust/pull/58778/
532 [58717]: https://github.com/rust-lang/rust/pull/58717/
533 [58369]: https://github.com/rust-lang/rust/pull/58369/
534 [58423]: https://github.com/rust-lang/rust/pull/58423/
535 [58080]: https://github.com/rust-lang/rust/pull/58080/
536 [57847]: https://github.com/rust-lang/rust/pull/57847/
537 [58575]: https://github.com/rust-lang/rust/pull/58575
538 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
539 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
540 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
541 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
542 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
543 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
544 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
545 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
546 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
547 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
548 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
549 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
551 Version 1.34.2 (2019-05-14)
552 ===========================
554 * [Destabilize the `Error::type_id` function due to a security
555 vulnerability][60785] ([CVE-2019-12083])
557 [60785]: https://github.com/rust-lang/rust/pull/60785
558 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
560 Version 1.34.1 (2019-04-25)
561 ===========================
563 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
564 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
565 * [Fix Clippy panic when checking some macros][clippy/3805]
567 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
568 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
569 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
571 Version 1.34.0 (2019-04-11)
572 ==========================
576 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
577 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
579 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
580 `#[attr{}]` procedural macros.][57367]
581 - [You can now write `extern crate self as foo;`][57407] to import your
582 crate's root into the extern prelude.
587 - [You can now target `riscv64imac-unknown-none-elf` and
588 `riscv64gc-unknown-none-elf`.][58406]
589 - [You can now enable linker plugin LTO optimisations with
590 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
591 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
593 - [You can now target `powerpc64-unknown-freebsd`.][57809]
598 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
599 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
600 the `Hash` trait to create an iterator.
601 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
602 methods.][58421] Most notably you no longer require the `Ord` trait to create
604 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
605 for all numeric types.][58044]
606 - [Indexing a `str` is now generic over all types that
607 implement `SliceIndex<str>`.][57604]
608 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
609 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
610 produce a warning if their returning type is unused.
611 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
612 `overflowing_pow` are now available for all numeric types.][57873] These are
613 equivalent to methods such as `wrapping_add` for the `pow` operation.
622 * [`atomic::AtomicI16`]
623 * [`atomic::AtomicI32`]
624 * [`atomic::AtomicI64`]
625 * [`atomic::AtomicI8`]
626 * [`atomic::AtomicU16`]
627 * [`atomic::AtomicU32`]
628 * [`atomic::AtomicU64`]
629 * [`atomic::AtomicU8`]
630 * [`convert::Infallible`]
631 * [`convert::TryFrom`]
632 * [`convert::TryInto`]
634 * [`iter::successors`]
635 * [`num::NonZeroI128`]
636 * [`num::NonZeroI16`]
637 * [`num::NonZeroI32`]
638 * [`num::NonZeroI64`]
640 * [`num::NonZeroIsize`]
641 * [`slice::sort_by_cached_key`]
642 * [`str::escape_debug`]
643 * [`str::escape_default`]
644 * [`str::escape_unicode`]
645 * [`str::split_ascii_whitespace`]
648 * [`Instant::checked_add`]
649 * [`Instant::checked_sub`]
650 * [`SystemTime::checked_add`]
651 * [`SystemTime::checked_sub`]
655 - [You can now use alternative registries to crates.io.][cargo/6654]
659 - [You can now use the `?` operator in your documentation tests without manually
660 adding `fn main() -> Result<(), _> {}`.][56470]
664 - [`Command::before_exec` is being replaced by the unsafe method
665 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
666 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
667 can now use `const` functions in `static` variables.
669 [58370]: https://github.com/rust-lang/rust/pull/58370/
670 [58406]: https://github.com/rust-lang/rust/pull/58406/
671 [58421]: https://github.com/rust-lang/rust/pull/58421/
672 [58166]: https://github.com/rust-lang/rust/pull/58166/
673 [58044]: https://github.com/rust-lang/rust/pull/58044/
674 [58057]: https://github.com/rust-lang/rust/pull/58057/
675 [58059]: https://github.com/rust-lang/rust/pull/58059/
676 [57809]: https://github.com/rust-lang/rust/pull/57809/
677 [57873]: https://github.com/rust-lang/rust/pull/57873/
678 [57604]: https://github.com/rust-lang/rust/pull/57604/
679 [57367]: https://github.com/rust-lang/rust/pull/57367/
680 [57407]: https://github.com/rust-lang/rust/pull/57407/
681 [57425]: https://github.com/rust-lang/rust/pull/57425/
682 [57106]: https://github.com/rust-lang/rust/pull/57106/
683 [56470]: https://github.com/rust-lang/rust/pull/56470/
684 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
685 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
686 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
687 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
688 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
689 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
690 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
691 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
692 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
693 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
694 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
695 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
696 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
697 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
698 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
699 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
700 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
701 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
702 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
703 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
704 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
705 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
706 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
707 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
708 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
709 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
710 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
711 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
712 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
713 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
714 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
717 Version 1.33.0 (2019-02-28)
718 ==========================
722 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
723 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
724 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
725 E.g. You can have match statement on a `u8` that covers `0..=255` and
726 you would no longer be required to have a `_ => unreachable!()` case.
727 - [You can now have multiple patterns in `if let` and `while let`
728 expressions.][57532] You can do this with the same syntax as a `match`
738 let state = Creature::Crab("Ferris");
740 if let Creature::Crab(name) | Creature::Person(name) = state {
741 println!("This creature's name is: {}", name);
745 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
746 this feature will by default produce a warning as this behaviour can be
747 unintuitive. E.g. `if let _ = 5 {}`
748 - [You can now use `let` bindings, assignments, expression statements,
749 and irrefutable pattern destructuring in const functions.][57175]
750 - [You can now call unsafe const functions.][57067] E.g.
752 const unsafe fn foo() -> i32 { 5 }
753 const fn bar() -> i32 {
757 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
758 E.g. `#[cfg_attr(all(), must_use, optimize)]`
759 - [You can now specify a specific alignment with the `#[repr(packed)]`
760 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
761 with an alignment of 2 bytes and a size of 6 bytes.
762 - [You can now import an item from a module as an `_`.][56303] This allows you to
763 import a trait's impls, and not have the name in the namespace. E.g.
765 use std::io::Read as _;
767 // Allowed as there is only one `Read` in the module.
770 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
774 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
775 command line argument.][56351]
776 - [The minimum required LLVM version has been bumped to 6.0.][56642]
777 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
778 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
779 tier 2 support.][57130] Visit the [platform support][platform-support] page for
780 information on Rust's platform support.
781 - [Added support for the `thumbv7neon-linux-androideabi` and
782 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
783 - [Added support for the `x86_64-unknown-uefi` target.][56769]
787 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
788 functions for all numeric types.][57566]
789 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
790 are now `const` functions for all numeric types.][57105]
791 - [The methods `is_positive` and `is_negative` are now `const` functions for
792 all signed numeric types.][57105]
793 - [The `get` method for all `NonZero` types is now `const`.][57167]
794 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
795 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
796 numeric types.][57234]
797 - [`Ipv4Addr::new` is now a `const` function][57234]
801 - [`unix::FileExt::read_exact_at`]
802 - [`unix::FileExt::write_all_at`]
803 - [`Option::transpose`]
804 - [`Result::transpose`]
805 - [`convert::identity`]
808 - [`marker::PhantomPinned`]
809 - [`Vec::resize_with`]
810 - [`VecDeque::resize_with`]
811 - [`Duration::as_millis`]
812 - [`Duration::as_micros`]
813 - [`Duration::as_nanos`]
818 - [You can now publish crates that require a feature flag to compile with
819 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
820 - [Cargo should now rebuild a crate if a file was modified during the initial
825 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
826 are now deprecated in the standard library, and their usage will now produce a warning.
827 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
829 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
831 - [Libtest no longer creates a new thread for each test when
832 `--test-threads=1`. It also runs the tests in deterministic order][56243]
834 [55982]: https://github.com/rust-lang/rust/pull/55982/
835 [56243]: https://github.com/rust-lang/rust/pull/56243
836 [56303]: https://github.com/rust-lang/rust/pull/56303/
837 [56351]: https://github.com/rust-lang/rust/pull/56351/
838 [56362]: https://github.com/rust-lang/rust/pull/56362
839 [56642]: https://github.com/rust-lang/rust/pull/56642/
840 [56769]: https://github.com/rust-lang/rust/pull/56769/
841 [56805]: https://github.com/rust-lang/rust/pull/56805
842 [56947]: https://github.com/rust-lang/rust/pull/56947/
843 [57049]: https://github.com/rust-lang/rust/pull/57049/
844 [57067]: https://github.com/rust-lang/rust/pull/57067/
845 [57105]: https://github.com/rust-lang/rust/pull/57105
846 [57130]: https://github.com/rust-lang/rust/pull/57130/
847 [57167]: https://github.com/rust-lang/rust/pull/57167/
848 [57175]: https://github.com/rust-lang/rust/pull/57175/
849 [57234]: https://github.com/rust-lang/rust/pull/57234/
850 [57332]: https://github.com/rust-lang/rust/pull/57332/
851 [57465]: https://github.com/rust-lang/rust/pull/57465/
852 [57532]: https://github.com/rust-lang/rust/pull/57532/
853 [57535]: https://github.com/rust-lang/rust/pull/57535/
854 [57566]: https://github.com/rust-lang/rust/pull/57566/
855 [57615]: https://github.com/rust-lang/rust/pull/57615/
856 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
857 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
858 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
859 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
860 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
861 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
862 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
863 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
864 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
865 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
866 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
867 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
868 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
869 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
870 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
871 [platform-support]: https://forge.rust-lang.org/platform-support.html
873 Version 1.32.0 (2019-01-17)
874 ==========================
879 - [You can now use the `?` operator in macro definitions.][56245] The `?`
880 operator allows you to specify zero or one repetitions similar to the `*` and
882 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
883 now always resolve to the item (`enum`, `struct`, etc.) available in the
884 module if present, before resolving to a external crate or an item the prelude.][56759]
887 enum Color { Red, Green, Blue }
893 - [You can now match against `PhantomData<T>` types.][55837]
894 - [You can now match against literals in macros with the `literal`
895 specifier.][56072] This will match against a literal of any type.
896 E.g. `1`, `'A'`, `"Hello World"`
897 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
899 struct Point(i32, i32);
902 pub fn new(x: i32, y: i32) -> Self {
906 pub fn is_origin(&self) -> bool {
914 - [Self can also now be used in type definitions.][56366] E.g.
918 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
921 Cons(T, Box<Self>) // likewise here
924 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
925 a `impl Trait` or `dyn Trait` is returned and unused in the program.
929 - [The default allocator has changed from jemalloc to the default allocator on
930 your system.][55238] The compiler itself on Linux & macOS will still use
931 jemalloc, but programs compiled with it will use the system allocator.
932 - [Added the `aarch64-pc-windows-msvc` target.][55702]
936 - [`PathBuf` now implements `FromStr`.][55148]
937 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
938 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
939 easily debug expressions in your rust program. E.g.
942 let b = dbg!(a * 2) + 1;
943 // ^-- prints: [src/main.rs:4] a * 2 = 4
947 The following APIs are now `const` functions and can be used in a
951 - [`UnsafeCell::get`]
954 - [`ManuallyDrop::new`]
955 - [`ManuallyDrop::into_inner`]
956 - [`RangeInclusive::start`]
957 - [`RangeInclusive::end`]
958 - [`NonNull::as_ptr`]
961 - [`Duration::as_secs`]
962 - [`Duration::subsec_millis`]
963 - [`Duration::subsec_micros`]
964 - [`Duration::subsec_nanos`]
966 - [`Ipv4Addr::is_unspecified`]
968 - [`Ipv6Addr::octets`]
972 - [`i8::to_be_bytes`]
973 - [`i8::to_le_bytes`]
974 - [`i8::to_ne_bytes`]
975 - [`i8::from_be_bytes`]
976 - [`i8::from_le_bytes`]
977 - [`i8::from_ne_bytes`]
978 - [`i16::to_be_bytes`]
979 - [`i16::to_le_bytes`]
980 - [`i16::to_ne_bytes`]
981 - [`i16::from_be_bytes`]
982 - [`i16::from_le_bytes`]
983 - [`i16::from_ne_bytes`]
984 - [`i32::to_be_bytes`]
985 - [`i32::to_le_bytes`]
986 - [`i32::to_ne_bytes`]
987 - [`i32::from_be_bytes`]
988 - [`i32::from_le_bytes`]
989 - [`i32::from_ne_bytes`]
990 - [`i64::to_be_bytes`]
991 - [`i64::to_le_bytes`]
992 - [`i64::to_ne_bytes`]
993 - [`i64::from_be_bytes`]
994 - [`i64::from_le_bytes`]
995 - [`i64::from_ne_bytes`]
996 - [`i128::to_be_bytes`]
997 - [`i128::to_le_bytes`]
998 - [`i128::to_ne_bytes`]
999 - [`i128::from_be_bytes`]
1000 - [`i128::from_le_bytes`]
1001 - [`i128::from_ne_bytes`]
1002 - [`isize::to_be_bytes`]
1003 - [`isize::to_le_bytes`]
1004 - [`isize::to_ne_bytes`]
1005 - [`isize::from_be_bytes`]
1006 - [`isize::from_le_bytes`]
1007 - [`isize::from_ne_bytes`]
1008 - [`u8::to_be_bytes`]
1009 - [`u8::to_le_bytes`]
1010 - [`u8::to_ne_bytes`]
1011 - [`u8::from_be_bytes`]
1012 - [`u8::from_le_bytes`]
1013 - [`u8::from_ne_bytes`]
1014 - [`u16::to_be_bytes`]
1015 - [`u16::to_le_bytes`]
1016 - [`u16::to_ne_bytes`]
1017 - [`u16::from_be_bytes`]
1018 - [`u16::from_le_bytes`]
1019 - [`u16::from_ne_bytes`]
1020 - [`u32::to_be_bytes`]
1021 - [`u32::to_le_bytes`]
1022 - [`u32::to_ne_bytes`]
1023 - [`u32::from_be_bytes`]
1024 - [`u32::from_le_bytes`]
1025 - [`u32::from_ne_bytes`]
1026 - [`u64::to_be_bytes`]
1027 - [`u64::to_le_bytes`]
1028 - [`u64::to_ne_bytes`]
1029 - [`u64::from_be_bytes`]
1030 - [`u64::from_le_bytes`]
1031 - [`u64::from_ne_bytes`]
1032 - [`u128::to_be_bytes`]
1033 - [`u128::to_le_bytes`]
1034 - [`u128::to_ne_bytes`]
1035 - [`u128::from_be_bytes`]
1036 - [`u128::from_le_bytes`]
1037 - [`u128::from_ne_bytes`]
1038 - [`usize::to_be_bytes`]
1039 - [`usize::to_le_bytes`]
1040 - [`usize::to_ne_bytes`]
1041 - [`usize::from_be_bytes`]
1042 - [`usize::from_le_bytes`]
1043 - [`usize::from_ne_bytes`]
1047 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1048 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1052 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1056 - [The argument types for AVX's
1057 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1058 been changed from `*const` to `*mut` as the previous implementation
1062 [55148]: https://github.com/rust-lang/rust/pull/55148/
1063 [55238]: https://github.com/rust-lang/rust/pull/55238/
1064 [55280]: https://github.com/rust-lang/rust/pull/55280/
1065 [55610]: https://github.com/rust-lang/rust/pull/55610/
1066 [55663]: https://github.com/rust-lang/rust/pull/55663/
1067 [55702]: https://github.com/rust-lang/rust/pull/55702/
1068 [55837]: https://github.com/rust-lang/rust/pull/55837/
1069 [55843]: https://github.com/rust-lang/rust/pull/55843/
1070 [56072]: https://github.com/rust-lang/rust/pull/56072/
1071 [56245]: https://github.com/rust-lang/rust/pull/56245/
1072 [56365]: https://github.com/rust-lang/rust/pull/56365/
1073 [56366]: https://github.com/rust-lang/rust/pull/56366/
1074 [56395]: https://github.com/rust-lang/rust/pull/56395/
1075 [56759]: https://github.com/rust-lang/rust/pull/56759/
1076 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1077 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1078 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1079 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1080 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1081 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1082 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1083 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1084 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1085 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1086 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1087 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1088 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1089 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1090 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1091 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1092 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1093 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1094 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1095 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1096 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1097 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1098 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1099 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1100 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1101 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1102 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1103 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1104 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1105 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1106 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1107 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1108 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1109 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1110 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1111 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1112 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1113 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1114 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1115 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1116 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1117 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1118 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1119 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1120 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1121 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
1122 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
1123 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1124 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1125 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1126 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1127 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1128 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1129 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1130 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
1131 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
1132 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
1133 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
1134 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
1135 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
1136 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
1137 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
1138 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
1139 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
1140 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
1141 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
1142 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
1143 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
1144 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
1145 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
1146 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
1147 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
1148 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
1149 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
1150 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
1151 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
1152 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
1153 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
1154 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
1155 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
1156 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
1157 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
1158 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
1159 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
1160 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
1161 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
1162 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
1163 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
1164 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
1165 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
1166 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
1167 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
1168 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
1171 Version 1.31.1 (2018-12-20)
1172 ===========================
1174 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
1175 - [Fix broken go-to-definition in RLS][rls/1171]
1176 - [Fix infinite loop on hover in RLS][rls/1170]
1178 [56562]: https://github.com/rust-lang/rust/pull/56562
1179 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
1180 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
1182 Version 1.31.0 (2018-12-06)
1183 ==========================
1187 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
1188 - [New lifetime elision rules now allow for eliding lifetimes in functions and
1189 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
1190 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
1192 - [You can now define and use `const` functions.][54835] These are currently
1193 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
1194 [language reference][const-reference] for what exactly is available.
1195 - [You can now use tool lints, which allow you to scope lints from external
1196 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
1197 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
1198 a crate, not just in exported functions.][54451]
1199 - [You can now use parentheses in pattern matches.][54497]
1203 - [Updated musl to 1.1.20][54430]
1207 - [You can now convert `num::NonZero*` types to their raw equivalents using the
1208 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
1209 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
1210 into `Option<&mut T>` using the `From` trait.][53218]
1211 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
1216 - [`slice::align_to`]
1217 - [`slice::align_to_mut`]
1218 - [`slice::chunks_exact`]
1219 - [`slice::chunks_exact_mut`]
1220 - [`slice::rchunks`]
1221 - [`slice::rchunks_mut`]
1222 - [`slice::rchunks_exact`]
1223 - [`slice::rchunks_exact_mut`]
1224 - [`Option::replace`]
1228 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
1229 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
1230 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
1232 [52813]: https://github.com/rust-lang/rust/pull/52813/
1233 [53218]: https://github.com/rust-lang/rust/pull/53218/
1234 [53555]: https://github.com/rust-lang/rust/issues/53555/
1235 [54057]: https://github.com/rust-lang/rust/pull/54057/
1236 [54240]: https://github.com/rust-lang/rust/pull/54240/
1237 [54430]: https://github.com/rust-lang/rust/pull/54430/
1238 [54451]: https://github.com/rust-lang/rust/pull/54451/
1239 [54497]: https://github.com/rust-lang/rust/pull/54497/
1240 [54778]: https://github.com/rust-lang/rust/pull/54778/
1241 [54835]: https://github.com/rust-lang/rust/pull/54835/
1242 [54870]: https://github.com/rust-lang/rust/pull/54870/
1243 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
1244 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
1245 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
1246 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
1247 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
1248 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
1249 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1250 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
1251 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1252 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
1253 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
1254 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
1255 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
1256 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
1258 Version 1.30.1 (2018-11-08)
1259 ===========================
1261 - [Fixed overflow ICE in rustdoc][54199]
1262 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
1264 [54199]: https://github.com/rust-lang/rust/pull/54199
1265 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
1267 Version 1.30.0 (2018-10-25)
1268 ==========================
1272 - [Procedural macros are now available.][52081] These kinds of macros allow for
1273 more powerful code generation. There is a [new chapter available][proc-macros]
1274 in the Rust Programming Language book that goes further in depth.
1275 - [You can now use keywords as identifiers using the raw identifiers
1276 syntax (`r#`),][53236] e.g. `let r#for = true;`
1277 - [Using anonymous parameters in traits is now deprecated with a warning and
1278 will be a hard error in the 2018 edition.][53272]
1279 - [You can now use `crate` in paths.][54404] This allows you to refer to the
1280 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
1281 - [Using a external crate no longer requires being prefixed with `::`.][54404]
1282 Previously, using a external crate in a module without a use statement
1283 required `let json = ::serde_json::from_str(foo);` but can now be written
1284 as `let json = serde_json::from_str(foo);`.
1285 - [You can now apply the `#[used]` attribute to static items to prevent the
1286 compiler from optimising them away, even if they appear to be unused,][51363]
1287 e.g. `#[used] static FOO: u32 = 1;`
1288 - [You can now import and reexport macros from other crates with the `use`
1289 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
1290 the root module of the crate. If your macro relies on calling other local
1291 macros, it is recommended to export with the
1292 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
1294 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
1295 using the `vis` specifier.][53370]
1296 - [Non-macro attributes now allow all forms of literals, not just
1297 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
1298 write `#[attr(true)]`.
1299 - [You can now specify a function to handle a panic in the Rust runtime with the
1300 `#[panic_handler]` attribute.][51366]
1304 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
1305 - [Added the `aarch64-unknown-netbsd` target][53165]
1309 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
1313 - [`Ipv4Addr::BROADCAST`]
1314 - [`Ipv4Addr::LOCALHOST`]
1315 - [`Ipv4Addr::UNSPECIFIED`]
1316 - [`Ipv6Addr::LOCALHOST`]
1317 - [`Ipv6Addr::UNSPECIFIED`]
1318 - [`Iterator::find_map`]
1320 The following methods are replacement methods for `trim_left`, `trim_right`,
1321 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
1323 - [`str::trim_end_matches`]
1325 - [`str::trim_start_matches`]
1326 - [`str::trim_start`]
1330 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
1331 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
1332 equivalent to calling `rustdoc --error-format=json`.
1333 - [Cargo will now provide a progress bar for builds.][cargo/5995]
1337 - [`rustdoc` allows you to specify what edition to treat your code as with the
1338 `--edition` option.][54057]
1339 - [`rustdoc` now has the `--color` (specify whether to output color) and
1340 `--error-format` (specify error format, e.g. `json`) options.][53003]
1341 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
1342 debug symbols.][53774]
1343 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
1344 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
1346 [50911]: https://github.com/rust-lang/rust/pull/50911/
1347 [51363]: https://github.com/rust-lang/rust/pull/51363/
1348 [51366]: https://github.com/rust-lang/rust/pull/51366/
1349 [52081]: https://github.com/rust-lang/rust/pull/52081/
1350 [53003]: https://github.com/rust-lang/rust/pull/53003/
1351 [53033]: https://github.com/rust-lang/rust/pull/53033/
1352 [53044]: https://github.com/rust-lang/rust/pull/53044/
1353 [53165]: https://github.com/rust-lang/rust/pull/53165/
1354 [53213]: https://github.com/rust-lang/rust/pull/53213/
1355 [53236]: https://github.com/rust-lang/rust/pull/53236/
1356 [53272]: https://github.com/rust-lang/rust/pull/53272/
1357 [53370]: https://github.com/rust-lang/rust/pull/53370/
1358 [53459]: https://github.com/rust-lang/rust/pull/53459/
1359 [53774]: https://github.com/rust-lang/rust/pull/53774/
1360 [53822]: https://github.com/rust-lang/rust/pull/53822/
1361 [54057]: https://github.com/rust-lang/rust/pull/54057/
1362 [54146]: https://github.com/rust-lang/rust/pull/54146/
1363 [54404]: https://github.com/rust-lang/rust/pull/54404/
1364 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
1365 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
1366 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
1367 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
1369 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
1370 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
1371 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
1372 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
1373 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
1374 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
1375 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
1376 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
1377 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
1378 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
1381 Version 1.29.2 (2018-10-11)
1382 ===========================
1384 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
1385 - The `rls-preview` component on the windows-gnu targets has been restored.
1387 [54639]: https://github.com/rust-lang/rust/pull/54639
1390 Version 1.29.1 (2018-09-25)
1391 ===========================
1396 - The standard library's `str::repeat` function contained an out of bounds write
1397 caused by an integer overflow. This has been fixed by deterministically
1398 panicking when an overflow happens.
1400 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
1404 Version 1.29.0 (2018-09-13)
1405 ==========================
1409 - [Bumped minimum LLVM version to 5.0.][51899]
1410 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
1411 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
1415 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
1416 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
1417 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
1418 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
1420 - [`Cell<T>` now allows `T` to be unsized.][50494]
1421 - [`SocketAddr` is now stable on Redox.][52656]
1426 - [`Iterator::flatten`]
1431 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
1432 `--locked` to disable this behavior.
1433 - [`cargo-install` will now allow you to cross compile an install
1434 using `--target`.][cargo/5614]
1435 - [Added the `cargo-fix` subcommand to automatically move project code from
1436 2015 edition to 2018.][cargo/5723]
1437 - [`cargo doc` can now optionally document private types using the
1438 `--document-private-items` flag.][cargo/5543]
1442 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
1443 the specified level to that level.][52354] For example `--cap-lints warn`
1444 will demote `deny` and `forbid` lints to `warn`.
1445 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
1446 fails and `101` if there is a panic.][52197]
1447 - [A preview of clippy has been made available through rustup.][51122]
1448 You can install the preview with `rustup component add clippy-preview`.
1452 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
1453 Use `str::get_unchecked(begin..end)` instead.
1454 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
1455 Consider using the `home_dir` function from
1456 https://crates.io/crates/dirs instead.
1457 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
1458 - [`cfg` attributes and `--cfg` command line flags are now more
1459 strictly validated.][53893]
1461 [53893]: https://github.com/rust-lang/rust/pull/53893/
1462 [52861]: https://github.com/rust-lang/rust/pull/52861/
1463 [52656]: https://github.com/rust-lang/rust/pull/52656/
1464 [52239]: https://github.com/rust-lang/rust/pull/52239/
1465 [52330]: https://github.com/rust-lang/rust/pull/52330/
1466 [52354]: https://github.com/rust-lang/rust/pull/52354/
1467 [52402]: https://github.com/rust-lang/rust/pull/52402/
1468 [52103]: https://github.com/rust-lang/rust/pull/52103/
1469 [52197]: https://github.com/rust-lang/rust/pull/52197/
1470 [51807]: https://github.com/rust-lang/rust/pull/51807/
1471 [51899]: https://github.com/rust-lang/rust/pull/51899/
1472 [51912]: https://github.com/rust-lang/rust/pull/51912/
1473 [51511]: https://github.com/rust-lang/rust/pull/51511/
1474 [51619]: https://github.com/rust-lang/rust/pull/51619/
1475 [51656]: https://github.com/rust-lang/rust/pull/51656/
1476 [51178]: https://github.com/rust-lang/rust/pull/51178/
1477 [51122]: https://github.com/rust-lang/rust/pull/51122
1478 [50494]: https://github.com/rust-lang/rust/pull/50494/
1479 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
1480 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
1481 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
1482 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
1483 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
1484 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
1485 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
1488 Version 1.28.0 (2018-08-02)
1489 ===========================
1493 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
1494 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
1495 the inner type across Foreign Function Interface (FFI) boundaries.
1496 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
1497 and can now be used as identifiers.][51196]
1498 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
1499 stable.][51241] This will allow users to specify a global allocator for
1501 - [Unit test functions marked with the `#[test]` attribute can now return
1502 `Result<(), E: Debug>` in addition to `()`.][51298]
1503 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
1504 allows macros to easily target lifetimes.
1508 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
1509 prioritise making smaller binary sizes. `z` is the same as `s` with the
1510 exception that it does not vectorise loops, which typically results in an even
1512 - [The short error format is now stable.][49546] Specified with
1513 `--error-format=short` this option will provide a more compressed output of
1514 rust error messages.
1515 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
1516 - [Reduced the number of allocations in the macro parser.][50855] This can
1517 improve compile times of macro heavy crates on average by 5%.
1521 - [Implemented `Default` for `&mut str`.][51306]
1522 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
1523 - [Implemented `Extend` for `()`.][50234]
1524 - [The `Debug` implementation of `time::Duration` should now be more easily
1525 human readable.][50364] Previously a `Duration` of one second would printed as
1526 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
1527 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
1528 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
1529 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
1530 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
1531 for `PathBuf`.][50170]
1532 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
1533 and `Wrapping<i128>`.][50465]
1534 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
1535 possible.][51050] This can provide up to a 40% speed increase.
1536 - [Improved error messages when using `format!`.][50610]
1540 - [`Iterator::step_by`]
1541 - [`Path::ancestors`]
1542 - [`SystemTime::UNIX_EPOCH`]
1543 - [`alloc::GlobalAlloc`]
1545 - [`alloc::LayoutErr`]
1548 - [`alloc::alloc_zeroed`]
1549 - [`alloc::dealloc`]
1550 - [`alloc::realloc`]
1551 - [`alloc::handle_alloc_error`]
1552 - [`btree_map::Entry::or_default`]
1553 - [`fmt::Alignment`]
1554 - [`hash_map::Entry::or_default`]
1555 - [`iter::repeat_with`]
1556 - [`num::NonZeroUsize`]
1557 - [`num::NonZeroU128`]
1558 - [`num::NonZeroU16`]
1559 - [`num::NonZeroU32`]
1560 - [`num::NonZeroU64`]
1561 - [`num::NonZeroU8`]
1562 - [`ops::RangeBounds`]
1563 - [`slice::SliceIndex`]
1564 - [`slice::from_mut`]
1565 - [`slice::from_ref`]
1566 - [`{Any + Send + Sync}::downcast_mut`]
1567 - [`{Any + Send + Sync}::downcast_ref`]
1568 - [`{Any + Send + Sync}::is`]
1572 - [Cargo will now no longer allow you to publish crates with build scripts that
1573 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
1574 considered to be immutable.
1578 - [The `suggestion_applicability` field in `rustc`'s json output is now
1579 stable.][50486] This will allow dev tools to check whether a code suggestion
1580 would apply to them.
1584 - [Rust will consider trait objects with duplicated constraints to be the same
1585 type as without the duplicated constraint.][51276] For example the below code will
1586 now fail to compile.
1591 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
1594 impl Trait + Send + Send {
1595 fn test(&self) { println!("two"); }
1599 [49546]: https://github.com/rust-lang/rust/pull/49546/
1600 [50143]: https://github.com/rust-lang/rust/pull/50143/
1601 [50170]: https://github.com/rust-lang/rust/pull/50170/
1602 [50234]: https://github.com/rust-lang/rust/pull/50234/
1603 [50265]: https://github.com/rust-lang/rust/pull/50265/
1604 [50364]: https://github.com/rust-lang/rust/pull/50364/
1605 [50385]: https://github.com/rust-lang/rust/pull/50385/
1606 [50465]: https://github.com/rust-lang/rust/pull/50465/
1607 [50486]: https://github.com/rust-lang/rust/pull/50486/
1608 [50554]: https://github.com/rust-lang/rust/pull/50554/
1609 [50610]: https://github.com/rust-lang/rust/pull/50610/
1610 [50855]: https://github.com/rust-lang/rust/pull/50855/
1611 [51050]: https://github.com/rust-lang/rust/pull/51050/
1612 [51196]: https://github.com/rust-lang/rust/pull/51196/
1613 [51200]: https://github.com/rust-lang/rust/pull/51200/
1614 [51241]: https://github.com/rust-lang/rust/pull/51241/
1615 [51276]: https://github.com/rust-lang/rust/pull/51276/
1616 [51298]: https://github.com/rust-lang/rust/pull/51298/
1617 [51306]: https://github.com/rust-lang/rust/pull/51306/
1618 [51562]: https://github.com/rust-lang/rust/pull/51562/
1619 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
1620 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
1621 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
1622 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
1623 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
1624 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
1625 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
1626 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
1627 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
1628 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
1629 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
1630 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
1631 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
1632 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
1633 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
1634 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
1635 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
1636 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
1637 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
1638 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
1639 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
1640 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
1641 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
1642 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
1643 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
1644 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
1645 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
1646 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
1647 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
1648 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
1650 Version 1.27.2 (2018-07-20)
1651 ===========================
1656 - The borrow checker was fixed to avoid potential unsoundness when using
1657 match ergonomics: [#52213][52213].
1659 [52213]: https://github.com/rust-lang/rust/issues/52213
1661 Version 1.27.1 (2018-07-10)
1662 ===========================
1667 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
1668 when running, which enabled executing code as some other user on a
1669 given machine. This release fixes that vulnerability; you can read
1670 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
1672 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
1677 - The borrow checker was fixed to avoid an additional potential unsoundness when using
1678 match ergonomics: [#51415][51415], [#49534][49534].
1680 [51415]: https://github.com/rust-lang/rust/issues/51415
1681 [49534]: https://github.com/rust-lang/rust/issues/49534
1682 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
1683 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
1685 Version 1.27.0 (2018-06-21)
1686 ==========================
1690 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
1691 be used as an identifier.
1692 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
1693 bare `Trait` syntax, and should make it clearer when being used in tandem with
1694 `impl Trait` because it is equivalent to the following syntax:
1695 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
1696 `Box<Trait> == Box<dyn Trait>`.
1697 - [Attributes on generic parameters such as types and lifetimes are
1698 now stable.][48851] e.g.
1699 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
1700 - [The `#[must_use]` attribute can now also be used on functions as well as
1701 types.][48925] It provides a lint that by default warns users when the
1702 value returned by a function has not been used.
1706 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
1710 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
1711 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
1712 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
1713 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
1714 the `cfg` attribute.
1715 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
1716 std are now available in core.][49896]
1717 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
1719 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
1720 that the operation isn't done in place.
1721 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
1722 the `#[must_use]` attribute][49533] to warn about unused potentially
1723 expensive allocations.
1727 - [`DoubleEndedIterator::rfind`]
1728 - [`DoubleEndedIterator::rfold`]
1729 - [`DoubleEndedIterator::try_rfold`]
1730 - [`Duration::from_micros`]
1731 - [`Duration::from_nanos`]
1732 - [`Duration::subsec_micros`]
1733 - [`Duration::subsec_millis`]
1734 - [`HashMap::remove_entry`]
1735 - [`Iterator::try_fold`]
1736 - [`Iterator::try_for_each`]
1738 - [`Option::filter`]
1739 - [`String::replace_range`]
1740 - [`Take::set_limit`]
1741 - [`hint::unreachable_unchecked`]
1742 - [`os::unix::process::parent_id`]
1743 - [`ptr::swap_nonoverlapping`]
1744 - [`slice::rsplit_mut`]
1746 - [`slice::swap_with_slice`]
1750 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
1751 `readme`, and `repository` fields.][cargo/5386]
1752 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
1753 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
1754 a different directory than `target` for placing compilation artifacts.
1755 - [Cargo will be adding automatic target inference for binaries, benchmarks,
1756 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
1757 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
1758 where cargo would infer a binary, Cargo will produce a warning. You can
1759 disable this feature ahead of time by setting any of the following to false:
1760 `autobins`, `autobenches`, `autoexamples`, `autotests`.
1761 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
1762 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
1766 - [Added “The Rustc book” into the official documentation.][49707]
1767 [“The Rustc book”] documents and teaches how to use the rustc compiler.
1768 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
1772 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
1773 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
1774 compile, `"".is_empty()` will still compile.
1775 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
1776 will only print the inner type.][48553] E.g.
1777 `print!("{:?}", AtomicBool::new(true))` will print `true`,
1778 not `AtomicBool(true)`.
1779 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
1780 could enter higher numbers but they were not supported by LLVM. Up to 512MB
1781 alignment should cover all use cases.
1782 - The `.description()` method on the `std::error::Error` trait
1783 [has been soft-deprecated][50163]. It is no longer required to implement it.
1785 [48553]: https://github.com/rust-lang/rust/pull/48553/
1786 [48851]: https://github.com/rust-lang/rust/pull/48851/
1787 [48925]: https://github.com/rust-lang/rust/pull/48925/
1788 [49533]: https://github.com/rust-lang/rust/pull/49533/
1789 [49623]: https://github.com/rust-lang/rust/pull/49623/
1790 [49630]: https://github.com/rust-lang/rust/pull/49630/
1791 [49664]: https://github.com/rust-lang/rust/pull/49664/
1792 [49699]: https://github.com/rust-lang/rust/pull/49699/
1793 [49707]: https://github.com/rust-lang/rust/pull/49707/
1794 [49719]: https://github.com/rust-lang/rust/pull/49719/
1795 [49896]: https://github.com/rust-lang/rust/pull/49896/
1796 [49968]: https://github.com/rust-lang/rust/pull/49968/
1797 [50163]: https://github.com/rust-lang/rust/pull/50163
1798 [50177]: https://github.com/rust-lang/rust/pull/50177/
1799 [50378]: https://github.com/rust-lang/rust/pull/50378/
1800 [50398]: https://github.com/rust-lang/rust/pull/50398/
1801 [50423]: https://github.com/rust-lang/rust/pull/50423/
1802 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
1803 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
1804 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
1805 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
1806 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
1807 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
1808 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
1809 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
1810 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
1811 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
1812 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
1813 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1814 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1815 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
1816 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
1817 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
1818 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
1819 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
1820 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
1821 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
1822 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
1823 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
1824 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1825 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
1826 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
1827 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
1828 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
1829 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
1830 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
1831 [“The Rustc book”]: https://doc.rust-lang.org/rustc
1834 Version 1.26.2 (2018-06-05)
1835 ==========================
1840 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
1842 [51117]: https://github.com/rust-lang/rust/issues/51117
1845 Version 1.26.1 (2018-05-29)
1846 ==========================
1851 - [RLS now works on Windows.][50646]
1852 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
1858 - [`fn main() -> impl Trait` no longer works for non-Termination
1860 This reverts an accidental stabilization.
1861 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
1862 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
1864 [50646]: https://github.com/rust-lang/rust/issues/50646
1865 [50656]: https://github.com/rust-lang/rust/pull/50656
1866 [50812]: https://github.com/rust-lang/rust/pull/50812
1867 [50950]: https://github.com/rust-lang/rust/issues/50950
1868 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
1870 Version 1.26.0 (2018-05-10)
1871 ==========================
1875 - [Closures now implement `Copy` and/or `Clone` if all captured variables
1876 implement either or both traits.][49299]
1877 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
1878 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
1879 lifetime can be elided.][49458]
1880 - [`impl Trait` is now stable allowing you to have abstract types in returns
1881 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
1882 `fn open(path: impl AsRef<Path>)`.
1883 - [Pattern matching will now automatically apply dereferences.][49394]
1884 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
1885 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
1886 - [A lot of operations are now available in a const context.][46882] E.g. You
1887 can now index into constant arrays, reference and dereference into constants,
1888 and use tuple struct constructors.
1889 - [Fixed entry slice patterns are now stable.][48516] E.g.
1891 let points = [1, 2, 3, 4];
1893 [1, 2, 3, 4] => println!("All points were sequential."),
1894 _ => println!("Not all points were sequential."),
1901 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
1902 - [Fixed exponential projection complexity on nested types.][48296]
1903 This can provide up to a ~12% reduction in compile times for certain crates.
1904 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
1905 to remap path prefixes outputted by the compiler.
1906 - [Added `powerpc-unknown-netbsd` target.][48281]
1910 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1911 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1912 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1913 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1914 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1915 - [`ascii::escape_default` is now available in libcore.][48735]
1916 - [Trailing commas are now supported in std and core macros.][48056]
1917 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1918 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1923 - [`*const T::copy_to_nonoverlapping`]
1924 - [`*const T::copy_to`]
1925 - [`*const T::read_unaligned`]
1926 - [`*const T::read_volatile`]
1927 - [`*const T::read`]
1929 - [`*const T::wrapping_add`]
1930 - [`*const T::wrapping_sub`]
1932 - [`*mut T::copy_to_nonoverlapping`]
1933 - [`*mut T::copy_to`]
1934 - [`*mut T::read_unaligned`]
1935 - [`*mut T::read_volatile`]
1937 - [`*mut T::replace`]
1940 - [`*mut T::wrapping_add`]
1941 - [`*mut T::wrapping_sub`]
1942 - [`*mut T::write_bytes`]
1943 - [`*mut T::write_unaligned`]
1944 - [`*mut T::write_volatile`]
1947 - [`FromUtf8Error::as_bytes`]
1948 - [`LocalKey::try_with`]
1949 - [`Option::cloned`]
1950 - [`btree_map::Entry::and_modify`]
1951 - [`fs::read_to_string`]
1954 - [`hash_map::Entry::and_modify`]
1955 - [`iter::FusedIterator`]
1956 - [`ops::RangeInclusive`]
1957 - [`ops::RangeToInclusive`]
1959 - [`slice::rotate_left`]
1960 - [`slice::rotate_right`]
1961 - [`String::retain`]
1966 - [Cargo will now output path to custom commands when `-v` is
1967 passed with `--list`][cargo/5041]
1968 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1972 - [The second edition of "The Rust Programming Language" book is now recommended
1973 over the first.][48404]
1978 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1979 syntax is now invalid.
1981 use std::ops::Fn as dyn;
1982 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1984 - [The result of dereferences are no longer promoted to `'static`.][47408]
1988 const PAIR: &(i32, i32) = &(0, 1);
1989 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1992 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1993 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1995 - [Removed hoedown from rustdoc.][48274]
1996 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1998 [46882]: https://github.com/rust-lang/rust/pull/46882
1999 [47379]: https://github.com/rust-lang/rust/pull/47379
2000 [47408]: https://github.com/rust-lang/rust/pull/47408
2001 [47813]: https://github.com/rust-lang/rust/pull/47813
2002 [48056]: https://github.com/rust-lang/rust/pull/48056
2003 [48125]: https://github.com/rust-lang/rust/pull/48125
2004 [48166]: https://github.com/rust-lang/rust/pull/48166
2005 [48235]: https://github.com/rust-lang/rust/pull/48235
2006 [48274]: https://github.com/rust-lang/rust/pull/48274
2007 [48281]: https://github.com/rust-lang/rust/pull/48281
2008 [48296]: https://github.com/rust-lang/rust/pull/48296
2009 [48326]: https://github.com/rust-lang/rust/pull/48326
2010 [48359]: https://github.com/rust-lang/rust/pull/48359
2011 [48404]: https://github.com/rust-lang/rust/pull/48404
2012 [48481]: https://github.com/rust-lang/rust/pull/48481
2013 [48516]: https://github.com/rust-lang/rust/pull/48516
2014 [48628]: https://github.com/rust-lang/rust/pull/48628
2015 [48629]: https://github.com/rust-lang/rust/pull/48629
2016 [48657]: https://github.com/rust-lang/rust/pull/48657
2017 [48735]: https://github.com/rust-lang/rust/pull/48735
2018 [48978]: https://github.com/rust-lang/rust/pull/48978
2019 [49101]: https://github.com/rust-lang/rust/pull/49101
2020 [49109]: https://github.com/rust-lang/rust/pull/49109
2021 [49121]: https://github.com/rust-lang/rust/pull/49121
2022 [49162]: https://github.com/rust-lang/rust/pull/49162
2023 [49184]: https://github.com/rust-lang/rust/pull/49184
2024 [49234]: https://github.com/rust-lang/rust/pull/49234
2025 [49255]: https://github.com/rust-lang/rust/pull/49255
2026 [49299]: https://github.com/rust-lang/rust/pull/49299
2027 [49305]: https://github.com/rust-lang/rust/pull/49305
2028 [49394]: https://github.com/rust-lang/rust/pull/49394
2029 [49458]: https://github.com/rust-lang/rust/pull/49458
2030 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2031 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2032 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2033 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2034 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2035 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2036 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2037 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2038 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2039 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2040 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2041 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2042 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2043 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2044 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2045 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2046 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2047 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2048 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2049 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2050 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2051 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2052 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2053 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2054 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2055 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2056 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2057 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2058 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2059 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2060 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2061 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2062 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2063 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2064 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2065 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2066 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2067 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2068 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2069 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2070 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2071 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2074 Version 1.25.0 (2018-03-29)
2075 ==========================
2079 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2080 - [You can now use nested groups of imports.][47948]
2081 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2082 - [You can now have `|` at the start of a match arm.][47947] e.g.
2084 enum Foo { A, B, C }
2090 | Foo::B => println!("AB"),
2091 | Foo::C => println!("C"),
2098 - [Upgraded to LLVM 6.][47828]
2099 - [Added `-C lto=val` option.][47521]
2100 - [Added `i586-unknown-linux-musl` target][47282]
2104 - [Impl Send for `process::Command` on Unix.][47760]
2105 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2106 - [`UnsafeCell::into_inner` is now safe.][47204]
2107 - [Implement libstd for CloudABI.][47268]
2108 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2109 - [Implement `AsRef<Path>` for Component][46985]
2110 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2111 - [Moved `Duration` to libcore.][46666]
2115 - [`Location::column`]
2118 The following functions can now be used in a constant expression.
2119 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2120 - [`Duration::new`][47300]
2121 - [`Duration::from_secs`][47300]
2122 - [`Duration::from_millis`][47300]
2126 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2127 - [`cargo new` now defaults to creating a binary crate, instead of a
2128 library crate.][cargo/5029]
2132 - [Rust by example is now shipped with new releases][46196]
2136 - [Deprecated `net::lookup_host`.][47510]
2137 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
2138 - The borrow checker was sometimes incorrectly permitting overlapping borrows
2139 around indexing operations (see [#47349][47349]). This has been fixed (which also
2140 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
2141 - [Removed deprecated unstable attribute `#[simd]`.][47251]
2143 [33903]: https://github.com/rust-lang/rust/pull/33903
2144 [47947]: https://github.com/rust-lang/rust/pull/47947
2145 [47948]: https://github.com/rust-lang/rust/pull/47948
2146 [47760]: https://github.com/rust-lang/rust/pull/47760
2147 [47790]: https://github.com/rust-lang/rust/pull/47790
2148 [47828]: https://github.com/rust-lang/rust/pull/47828
2149 [47398]: https://github.com/rust-lang/rust/pull/47398
2150 [47510]: https://github.com/rust-lang/rust/pull/47510
2151 [47521]: https://github.com/rust-lang/rust/pull/47521
2152 [47204]: https://github.com/rust-lang/rust/pull/47204
2153 [47251]: https://github.com/rust-lang/rust/pull/47251
2154 [47268]: https://github.com/rust-lang/rust/pull/47268
2155 [47282]: https://github.com/rust-lang/rust/pull/47282
2156 [47300]: https://github.com/rust-lang/rust/pull/47300
2157 [47349]: https://github.com/rust-lang/rust/pull/47349
2158 [46931]: https://github.com/rust-lang/rust/pull/46931
2159 [46985]: https://github.com/rust-lang/rust/pull/46985
2160 [47006]: https://github.com/rust-lang/rust/pull/47006
2161 [46830]: https://github.com/rust-lang/rust/pull/46830
2162 [46095]: https://github.com/rust-lang/rust/pull/46095
2163 [46666]: https://github.com/rust-lang/rust/pull/46666
2164 [46196]: https://github.com/rust-lang/rust/pull/46196
2165 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
2166 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
2167 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
2168 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
2169 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
2172 Version 1.24.1 (2018-03-01)
2173 ==========================
2175 - [Do not abort when unwinding through FFI][48251]
2176 - [Emit UTF-16 files for linker arguments on Windows][48318]
2177 - [Make the error index generator work again][48308]
2178 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
2180 [48251]: https://github.com/rust-lang/rust/issues/48251
2181 [48308]: https://github.com/rust-lang/rust/issues/48308
2182 [48318]: https://github.com/rust-lang/rust/issues/48318
2183 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
2186 Version 1.24.0 (2018-02-15)
2187 ==========================
2191 - [External `sysv64` ffi is now available.][46528]
2192 eg. `extern "sysv64" fn foo () {}`
2196 - [rustc now uses 16 codegen units by default for release builds.][46910]
2197 For the fastest builds, utilize `codegen-units=1`.
2198 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
2199 - [Add `aarch64-unknown-openbsd` support][46760]
2203 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
2204 improvement in performance in the majority of cases.
2205 - [`OsStr`'s `Debug` implementation is now lossless and consistent
2206 with Windows.][46798]
2207 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
2208 - [impl `From<bool>` for `AtomicBool`][46293]
2209 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
2210 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
2211 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
2212 - [float::from_bits now just uses transmute.][46012] This provides
2213 some optimisations from LLVM.
2214 - [Copied `AsciiExt` methods onto `char`][46077]
2215 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
2216 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
2217 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
2218 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
2222 - [`RefCell::replace`]
2224 - [`atomic::spin_loop_hint`]
2226 The following functions can now be used in a constant expression.
2227 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
2229 - [`AtomicBool::new`][46287]
2230 - [`AtomicUsize::new`][46287]
2231 - [`AtomicIsize::new`][46287]
2232 - [`AtomicPtr::new`][46287]
2233 - [`Cell::new`][46287]
2234 - [`{integer}::min_value`][46287]
2235 - [`{integer}::max_value`][46287]
2236 - [`mem::size_of`][46287]
2237 - [`mem::align_of`][46287]
2238 - [`ptr::null`][46287]
2239 - [`ptr::null_mut`][46287]
2240 - [`RefCell::new`][46287]
2241 - [`UnsafeCell::new`][46287]
2245 - [Added a `workspace.default-members` config that
2246 overrides implied `--all` in virtual workspaces.][cargo/4743]
2247 - [Enable incremental by default on development builds.][cargo/4817] Also added
2248 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
2249 per-project or global basis respectively.
2256 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
2257 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
2258 in accordance with IETF RFC 4291 §2.2.
2259 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
2260 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
2261 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
2262 - [Leading zeros in tuple struct members is now an error][47084]
2263 - [`column!()` macro is one-based instead of zero-based][46977]
2264 - [`fmt::Arguments` can no longer be shared across threads][45198]
2265 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
2266 - [Cargo sets a different working directory for the compiler][cargo/4788]
2268 [44884]: https://github.com/rust-lang/rust/pull/44884
2269 [45198]: https://github.com/rust-lang/rust/pull/45198
2270 [45506]: https://github.com/rust-lang/rust/pull/45506
2271 [45904]: https://github.com/rust-lang/rust/pull/45904
2272 [45990]: https://github.com/rust-lang/rust/pull/45990
2273 [46012]: https://github.com/rust-lang/rust/pull/46012
2274 [46077]: https://github.com/rust-lang/rust/pull/46077
2275 [46094]: https://github.com/rust-lang/rust/pull/46094
2276 [46284]: https://github.com/rust-lang/rust/pull/46284
2277 [46287]: https://github.com/rust-lang/rust/pull/46287
2278 [46293]: https://github.com/rust-lang/rust/pull/46293
2279 [46528]: https://github.com/rust-lang/rust/pull/46528
2280 [46671]: https://github.com/rust-lang/rust/pull/46671
2281 [46713]: https://github.com/rust-lang/rust/pull/46713
2282 [46735]: https://github.com/rust-lang/rust/pull/46735
2283 [46749]: https://github.com/rust-lang/rust/pull/46749
2284 [46760]: https://github.com/rust-lang/rust/pull/46760
2285 [46798]: https://github.com/rust-lang/rust/pull/46798
2286 [46828]: https://github.com/rust-lang/rust/pull/46828
2287 [46831]: https://github.com/rust-lang/rust/pull/46831
2288 [46833]: https://github.com/rust-lang/rust/pull/46833
2289 [46910]: https://github.com/rust-lang/rust/pull/46910
2290 [46977]: https://github.com/rust-lang/rust/pull/46977
2291 [47018]: https://github.com/rust-lang/rust/pull/47018
2292 [47080]: https://github.com/rust-lang/rust/pull/47080
2293 [47084]: https://github.com/rust-lang/rust/pull/47084
2294 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
2295 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
2296 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
2297 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
2298 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
2299 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
2302 Version 1.23.0 (2018-01-04)
2303 ==========================
2307 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
2308 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
2309 Which should fix some confusing errors in some operations.
2313 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
2314 undefined behavior.][45920]
2315 - [rustc now suggests renaming import if names clash.][45660]
2316 - [Display errors/warnings correctly when there are zero-width or
2317 wide characters.][45711]
2318 - [rustc now avoids unnecessary copies of arguments that are
2319 simple bindings][45380] This should improve memory usage on average by 5-10%.
2320 - [Updated musl used to build musl rustc to 1.1.17][45393]
2324 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
2325 - [Implement Hash for raw pointers to unsized types][45483]
2326 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
2327 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
2328 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
2329 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
2330 and `<*mut T>::as_mut`][44932]
2331 - [Optimized `Thread::{park, unpark}` implementation][45524]
2332 - [Improved `SliceExt::binary_search` performance.][45333]
2333 - [impl `FromIterator<()>` for `()`][45379]
2334 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
2342 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
2343 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
2344 - [Added unit test checking to `cargo check`][cargo/4592]
2345 - [Cargo now lets you install a specific version
2346 using `cargo install --version`][cargo/4637]
2350 - [Releases now ship with the Cargo book documentation.][45692]
2351 - [rustdoc now prints rendering warnings on every run.][45324]
2355 - [Changes have been made to type equality to make it more correct,
2356 in rare cases this could break some code.][45853] [Tracking issue for
2357 further information][45852]
2358 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
2359 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
2360 Android 9, the minimum supported version is Android 14.
2361 - [Bumped the minimum LLVM to 3.9][45326]
2363 [44042]: https://github.com/rust-lang/rust/pull/44042
2364 [44932]: https://github.com/rust-lang/rust/pull/44932
2365 [45267]: https://github.com/rust-lang/rust/pull/45267
2366 [45324]: https://github.com/rust-lang/rust/pull/45324
2367 [45326]: https://github.com/rust-lang/rust/pull/45326
2368 [45333]: https://github.com/rust-lang/rust/pull/45333
2369 [45379]: https://github.com/rust-lang/rust/pull/45379
2370 [45380]: https://github.com/rust-lang/rust/pull/45380
2371 [45393]: https://github.com/rust-lang/rust/pull/45393
2372 [45435]: https://github.com/rust-lang/rust/pull/45435
2373 [45483]: https://github.com/rust-lang/rust/pull/45483
2374 [45524]: https://github.com/rust-lang/rust/pull/45524
2375 [45571]: https://github.com/rust-lang/rust/pull/45571
2376 [45580]: https://github.com/rust-lang/rust/pull/45580
2377 [45610]: https://github.com/rust-lang/rust/pull/45610
2378 [45660]: https://github.com/rust-lang/rust/pull/45660
2379 [45692]: https://github.com/rust-lang/rust/pull/45692
2380 [45711]: https://github.com/rust-lang/rust/pull/45711
2381 [45772]: https://github.com/rust-lang/rust/pull/45772
2382 [45852]: https://github.com/rust-lang/rust/issues/45852
2383 [45853]: https://github.com/rust-lang/rust/pull/45853
2384 [45887]: https://github.com/rust-lang/rust/pull/45887
2385 [45920]: https://github.com/rust-lang/rust/pull/45920
2386 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
2387 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
2388 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
2391 Version 1.22.1 (2017-11-22)
2392 ==========================
2394 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
2396 [46183]: https://github.com/rust-lang/rust/pull/46183
2398 Version 1.22.0 (2017-11-22)
2399 ==========================
2403 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
2404 - [Now accepts underscores in unicode escapes][43716]
2405 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
2406 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
2410 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
2411 - [rustc will no longer inline in codegen units when compiling for debug][45075]
2412 This should decrease compile times for debug builds.
2413 - [strict memory alignment now enabled on ARMv6][45094]
2414 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
2418 - [Allow atomic operations up to 32 bits
2419 on `armv5te_unknown_linux_gnueabi`][44978]
2420 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
2421 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
2422 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
2423 - [Properly detect overflow in `Instant += Duration`.][44220]
2424 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
2425 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
2426 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
2433 - [Cargo will now build multi file examples in subdirectories of the `examples`
2434 folder that have a `main.rs` file.][cargo/4496]
2435 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
2436 the old format will continue to work and can be updated with `cargo update`.
2437 - [Now supports vendoring git repositories][cargo/3992]
2441 - [`libbacktrace` is now available on Apple platforms.][44251]
2442 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
2443 This now lets you specify that a given code example will fail to compile.
2447 - [The minimum Android version that rustc can build for has been bumped
2448 to `4.0` from `2.3`][45656]
2449 - [Allowing `T op= &T` for numeric types has broken some type
2450 inference cases][45480]
2453 [42526]: https://github.com/rust-lang/rust/pull/42526
2454 [43017]: https://github.com/rust-lang/rust/pull/43017
2455 [43716]: https://github.com/rust-lang/rust/pull/43716
2456 [43949]: https://github.com/rust-lang/rust/pull/43949
2457 [44015]: https://github.com/rust-lang/rust/pull/44015
2458 [44220]: https://github.com/rust-lang/rust/pull/44220
2459 [44251]: https://github.com/rust-lang/rust/pull/44251
2460 [44287]: https://github.com/rust-lang/rust/pull/44287
2461 [44303]: https://github.com/rust-lang/rust/pull/44303
2462 [44456]: https://github.com/rust-lang/rust/pull/44456
2463 [44466]: https://github.com/rust-lang/rust/pull/44466
2464 [44895]: https://github.com/rust-lang/rust/pull/44895
2465 [44966]: https://github.com/rust-lang/rust/pull/44966
2466 [44978]: https://github.com/rust-lang/rust/pull/44978
2467 [45041]: https://github.com/rust-lang/rust/pull/45041
2468 [45064]: https://github.com/rust-lang/rust/pull/45064
2469 [45075]: https://github.com/rust-lang/rust/pull/45075
2470 [45094]: https://github.com/rust-lang/rust/pull/45094
2471 [45095]: https://github.com/rust-lang/rust/pull/45095
2472 [45480]: https://github.com/rust-lang/rust/issues/45480
2473 [45656]: https://github.com/rust-lang/rust/pull/45656
2474 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
2475 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
2476 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
2483 Version 1.21.0 (2017-10-12)
2484 ==========================
2488 - [You can now use static references for literals.][43838]
2492 let x: &'static u32 = &0;
2495 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
2498 my_macro!(Vec<i32>::new); // Always worked
2499 my_macro!(Vec::<i32>::new); // Now works
2504 - [Upgraded jemalloc to 4.5.0][43911]
2505 - [Enabled unwinding panics on Redox][43917]
2506 - [Now runs LLVM in parallel during translation phase.][43506]
2507 This should reduce peak memory usage.
2511 - [Generate builtin impls for `Clone` for all arrays and tuples that
2512 are `T: Clone`][43690]
2513 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
2514 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
2515 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
2520 [`std::mem::discriminant`]
2524 - [You can now call `cargo install` with multiple package names][cargo/4216]
2525 - [Cargo commands inside a virtual workspace will now implicitly
2526 pass `--all`][cargo/4335]
2527 - [Added a `[patch]` section to `Cargo.toml` to handle
2528 prepublication dependencies][cargo/4123] [RFC 1969]
2529 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
2530 like patterns][cargo/4270]
2531 - [Added the `--all-targets` option][cargo/4400]
2532 - [Using required dependencies as a feature is now deprecated and emits
2533 a warning][cargo/4364]
2538 - [Cargo docs are moving][43916]
2539 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
2540 - [The rustdoc book is now available][43863]
2541 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
2542 - [Added a preview of RLS has been made available through rustup][44204]
2543 Install with `rustup component add rls-preview`
2544 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
2545 Previously only showed `std::os::unix`.
2549 - [Changes in method matching against higher-ranked types][43880] This may cause
2550 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
2551 - [rustc's JSON error output's byte position start at top of file.][42973]
2552 Was previously relative to the rustc's internal `CodeMap` struct which
2553 required the unstable library `libsyntax` to correctly use.
2554 - [`unused_results` lint no longer ignores booleans][43728]
2556 [42565]: https://github.com/rust-lang/rust/pull/42565
2557 [42973]: https://github.com/rust-lang/rust/pull/42973
2558 [43348]: https://github.com/rust-lang/rust/pull/43348
2559 [43459]: https://github.com/rust-lang/rust/pull/43459
2560 [43506]: https://github.com/rust-lang/rust/pull/43506
2561 [43540]: https://github.com/rust-lang/rust/pull/43540
2562 [43690]: https://github.com/rust-lang/rust/pull/43690
2563 [43728]: https://github.com/rust-lang/rust/pull/43728
2564 [43838]: https://github.com/rust-lang/rust/pull/43838
2565 [43863]: https://github.com/rust-lang/rust/pull/43863
2566 [43880]: https://github.com/rust-lang/rust/pull/43880
2567 [43911]: https://github.com/rust-lang/rust/pull/43911
2568 [43916]: https://github.com/rust-lang/rust/pull/43916
2569 [43917]: https://github.com/rust-lang/rust/pull/43917
2570 [44204]: https://github.com/rust-lang/rust/pull/44204
2571 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
2572 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
2573 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2574 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
2575 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
2576 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
2577 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
2578 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
2579 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
2581 Version 1.20.0 (2017-08-31)
2582 ===========================
2586 - [Associated constants are now stabilised.][42809]
2587 - [A lot of macro bugs are now fixed.][42913]
2592 - [Struct fields are now properly coerced to the expected field type.][42807]
2593 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
2594 `wasm32-experimental-emscripten` target.
2595 - [Changed some of the error messages to be more helpful.][42033]
2596 - [Add support for RELRO(RELocation Read-Only) for platforms that support
2598 - [rustc now reports the total number of errors on compilation failure][43015]
2599 previously this was only the number of errors in the pass that failed.
2600 - [Expansion in rustc has been sped up 29x.][42533]
2601 - [added `msp430-none-elf` target.][43099]
2602 - [rustc will now suggest one-argument enum variant to fix type mismatch when
2604 - [Fixes backtraces on Redox][43228]
2605 - [rustc now identifies different versions of same crate when absolute paths of
2606 different types match in an error message.][42826]
2612 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
2613 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
2615 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
2616 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
2617 - [Impl `Clone` for `DefaultHasher`.][42799]
2618 - [Impl `Sync` for `SyncSender`.][42397]
2619 - [Impl `FromStr` for `char`][42271]
2620 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
2622 - [allow messages in the `unimplemented!()` macro.][42155]
2623 ie. `unimplemented!("Waiting for 1.21 to be stable")`
2624 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
2625 - [Upgrade to Unicode 10.0.0][42999]
2626 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
2627 - [Skip the main thread's manual stack guard on Linux][43072]
2628 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
2629 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
2631 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
2636 - [`CStr::into_c_string`]
2637 - [`CString::as_c_str`]
2638 - [`CString::into_boxed_c_str`]
2639 - [`Chain::get_mut`]
2640 - [`Chain::get_ref`]
2641 - [`Chain::into_inner`]
2642 - [`Option::get_or_insert_with`]
2643 - [`Option::get_or_insert`]
2644 - [`OsStr::into_os_string`]
2645 - [`OsString::into_boxed_os_str`]
2648 - [`Utf8Error::error_len`]
2649 - [`char::EscapeDebug`]
2650 - [`char::escape_debug`]
2651 - [`compile_error!`]
2652 - [`f32::from_bits`]
2654 - [`f64::from_bits`]
2656 - [`mem::ManuallyDrop`]
2657 - [`slice::sort_unstable_by_key`]
2658 - [`slice::sort_unstable_by`]
2659 - [`slice::sort_unstable`]
2660 - [`str::from_boxed_utf8_unchecked`]
2661 - [`str::as_bytes_mut`]
2662 - [`str::as_bytes_mut`]
2663 - [`str::from_utf8_mut`]
2664 - [`str::from_utf8_unchecked_mut`]
2666 - [`str::get_unchecked_mut`]
2667 - [`str::get_unchecked`]
2669 - [`str::into_boxed_bytes`]
2674 - [Cargo API token location moved from `~/.cargo/config` to
2675 `~/.cargo/credentials`.][cargo/3978]
2676 - [Cargo will now build `main.rs` binaries that are in sub-directories of
2677 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
2678 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
2679 - [You can now specify version of a binary when installed through
2680 `cargo install` using `--vers`.][cargo/4229]
2681 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
2682 failure.][cargo/4248]
2683 - [Changed the convention around which file is the crate root.][cargo/4259]
2684 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
2685 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
2690 - [Functions with `'static` in their return types will now not be as usable as
2691 if they were using lifetime parameters instead.][42417]
2692 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
2693 takes the sign of NaN into account where previously didn't.][42430]
2695 [42033]: https://github.com/rust-lang/rust/pull/42033
2696 [42155]: https://github.com/rust-lang/rust/pull/42155
2697 [42271]: https://github.com/rust-lang/rust/pull/42271
2698 [42397]: https://github.com/rust-lang/rust/pull/42397
2699 [42417]: https://github.com/rust-lang/rust/pull/42417
2700 [42430]: https://github.com/rust-lang/rust/pull/42430
2701 [42431]: https://github.com/rust-lang/rust/pull/42431
2702 [42533]: https://github.com/rust-lang/rust/pull/42533
2703 [42571]: https://github.com/rust-lang/rust/pull/42571
2704 [42613]: https://github.com/rust-lang/rust/pull/42613
2705 [42799]: https://github.com/rust-lang/rust/pull/42799
2706 [42807]: https://github.com/rust-lang/rust/pull/42807
2707 [42809]: https://github.com/rust-lang/rust/pull/42809
2708 [42822]: https://github.com/rust-lang/rust/pull/42822
2709 [42826]: https://github.com/rust-lang/rust/pull/42826
2710 [42854]: https://github.com/rust-lang/rust/pull/42854
2711 [42913]: https://github.com/rust-lang/rust/pull/42913
2712 [42999]: https://github.com/rust-lang/rust/pull/42999
2713 [43011]: https://github.com/rust-lang/rust/pull/43011
2714 [43015]: https://github.com/rust-lang/rust/pull/43015
2715 [43072]: https://github.com/rust-lang/rust/pull/43072
2716 [43077]: https://github.com/rust-lang/rust/pull/43077
2717 [43097]: https://github.com/rust-lang/rust/pull/43097
2718 [43099]: https://github.com/rust-lang/rust/pull/43099
2719 [43170]: https://github.com/rust-lang/rust/pull/43170
2720 [43178]: https://github.com/rust-lang/rust/pull/43178
2721 [43185]: https://github.com/rust-lang/rust/pull/43185
2722 [43228]: https://github.com/rust-lang/rust/pull/43228
2723 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
2724 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
2725 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
2726 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
2727 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
2728 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2729 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
2730 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
2731 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
2732 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
2733 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
2734 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
2735 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
2736 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
2737 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
2738 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
2739 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
2740 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
2741 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
2742 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
2743 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
2744 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
2745 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
2746 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
2747 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
2748 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
2749 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
2750 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
2751 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
2752 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
2753 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
2754 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
2755 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
2756 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
2757 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
2758 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
2759 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
2760 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
2761 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
2764 Version 1.19.0 (2017-07-20)
2765 ===========================
2770 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
2771 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
2772 - [Macro recursion limit increased to 1024 from 64.][41676]
2773 - [Added lint for detecting unused macros.][41907]
2774 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
2775 For example: `let x = loop { break 7; };`
2776 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
2777 contain `Copy` types and cannot have a `Drop` implementation.
2778 Example: `union Foo { bar: u8, baz: usize }`
2779 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
2780 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
2785 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
2786 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
2787 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
2788 you should use `--target armv7-linux-androideabi`.
2789 - [Fixed ICE when removing a source file between compilation sessions.][41873]
2790 - [Minor optimisation of string operations.][42037]
2791 - [Compiler error message is now `aborting due to previous error(s)` instead of
2792 `aborting due to N previous errors`][42150] This was previously inaccurate and
2793 would only count certain kinds of errors.
2794 - [The compiler now supports Visual Studio 2017][42225]
2795 - [The compiler is now built against LLVM 4.0.1 by default][42948]
2796 - [Added a lot][42264] of [new error codes][42302]
2797 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
2798 libraries with C Run-time Libraries(CRT) to be statically linked.
2799 - [Fixed various ARM codegen bugs][42740]
2804 - [`String` now implements `FromIterator<Cow<'a, str>>` and
2805 `Extend<Cow<'a, str>>`][41449]
2806 - [`Vec` now implements `From<&mut [T]>`][41530]
2807 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
2808 - [`SplitWhitespace` now implements `Clone`][41659]
2809 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
2811 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
2812 macros, but for printing to stderr.
2817 - [`OsString::shrink_to_fit`]
2820 - [`thread::ThreadId`]
2825 - [Build scripts can now add environment variables to the environment
2826 the crate is being compiled in.
2827 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
2828 - [Subcommands now replace the current process rather than spawning a new
2829 child process][cargo/3970]
2830 - [Workspace members can now accept glob file patterns][cargo/3979]
2831 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
2832 the members in a given workspace.][cargo/3988]
2833 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
2834 - [Target directory path is now in the cargo metadata][cargo/4022]
2835 - [Cargo no longer checks out a local working directory for the
2836 crates.io index][cargo/4026] This should provide smaller file size for the
2837 registry, and improve cloning times, especially on Windows machines.
2838 - [Added an `--exclude` option for excluding certain packages when using the
2839 `--all` option][cargo/4031]
2840 - [Cargo will now automatically retry when receiving a 5xx error
2841 from crates.io][cargo/4032]
2842 - [The `--features` option now accepts multiple comma or space
2843 delimited values.][cargo/4084]
2844 - [Added support for custom target specific runners][cargo/3954]
2849 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
2851 - [Rust will now release XZ compressed packages][rust-installer/57]
2852 - [rustup will now prefer to download rust packages with
2853 XZ compression][rustup/1100] over GZip packages.
2854 - [Added the ability to escape `#` in rust documentation][41785] By adding
2855 additional `#`'s ie. `##` is now `#`
2860 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
2861 - [`-Z` flags are now no longer allowed to be used on the stable
2862 compiler.][41751] This has been a warning for a year previous to this.
2863 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
2864 longer works][42844]. Users should migrate to the built-in `check`
2865 command, which has been available since 1.16.
2866 - [Ending a float literal with `._` is now a hard error.
2867 Example: `42._` .][41946]
2868 - [Any use of a private `extern crate` outside of its module is now a
2869 hard error.][36886] This was previously a warning.
2870 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
2871 relative while the `::` prefix makes a path absolute, but was ignored and the
2872 path was relative regardless.
2873 - [Floating point constants in match patterns is now a hard error][36890]
2874 This was previously a warning.
2875 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
2876 match patterns is now a hard error][36891] This was previously a warning.
2877 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
2879 - [From the pound escape, lines consisting of multiple `#`s are
2881 - [It is an error to re-export private enum variants][42460]. This is
2882 known to break a number of crates that depend on an older version of
2884 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
2885 to use it to find the linker, and the build will fail where it did
2886 not previously][42607]
2888 [36886]: https://github.com/rust-lang/rust/issues/36886
2889 [36888]: https://github.com/rust-lang/rust/issues/36888
2890 [36890]: https://github.com/rust-lang/rust/issues/36890
2891 [36891]: https://github.com/rust-lang/rust/issues/36891
2892 [36892]: https://github.com/rust-lang/rust/issues/36892
2893 [37406]: https://github.com/rust-lang/rust/issues/37406
2894 [39983]: https://github.com/rust-lang/rust/pull/39983
2895 [41145]: https://github.com/rust-lang/rust/pull/41145
2896 [41192]: https://github.com/rust-lang/rust/pull/41192
2897 [41258]: https://github.com/rust-lang/rust/pull/41258
2898 [41370]: https://github.com/rust-lang/rust/pull/41370
2899 [41449]: https://github.com/rust-lang/rust/pull/41449
2900 [41530]: https://github.com/rust-lang/rust/pull/41530
2901 [41624]: https://github.com/rust-lang/rust/pull/41624
2902 [41656]: https://github.com/rust-lang/rust/pull/41656
2903 [41659]: https://github.com/rust-lang/rust/pull/41659
2904 [41676]: https://github.com/rust-lang/rust/pull/41676
2905 [41751]: https://github.com/rust-lang/rust/pull/41751
2906 [41764]: https://github.com/rust-lang/rust/pull/41764
2907 [41785]: https://github.com/rust-lang/rust/pull/41785
2908 [41873]: https://github.com/rust-lang/rust/pull/41873
2909 [41907]: https://github.com/rust-lang/rust/pull/41907
2910 [41946]: https://github.com/rust-lang/rust/pull/41946
2911 [42016]: https://github.com/rust-lang/rust/pull/42016
2912 [42037]: https://github.com/rust-lang/rust/pull/42037
2913 [42068]: https://github.com/rust-lang/rust/pull/42068
2914 [42150]: https://github.com/rust-lang/rust/pull/42150
2915 [42162]: https://github.com/rust-lang/rust/pull/42162
2916 [42225]: https://github.com/rust-lang/rust/pull/42225
2917 [42264]: https://github.com/rust-lang/rust/pull/42264
2918 [42302]: https://github.com/rust-lang/rust/pull/42302
2919 [42460]: https://github.com/rust-lang/rust/issues/42460
2920 [42607]: https://github.com/rust-lang/rust/issues/42607
2921 [42740]: https://github.com/rust-lang/rust/pull/42740
2922 [42844]: https://github.com/rust-lang/rust/issues/42844
2923 [42948]: https://github.com/rust-lang/rust/pull/42948
2924 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2925 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2926 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2927 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2928 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2929 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2930 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2931 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2932 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2933 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2934 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2935 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2936 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2937 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2938 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2939 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2940 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2941 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2942 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2943 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2944 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2945 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2948 Version 1.18.0 (2017-06-08)
2949 ===========================
2954 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2955 make the item visible to just that module tree. Also accepts the keyword
2956 `crate` to make something public to the whole crate but not users of the
2957 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2958 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2959 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2960 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2961 types like `Write + Send`, trailing `+` are now supported in trait objects,
2962 and better error reporting for trait objects starting with `?Sized`.
2963 - [0e+10 is now a valid floating point literal][40589]
2964 - [Now warns if you bind a lifetime parameter to 'static][40734]
2965 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2966 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2967 representation in some cases.][40377]
2972 - [rustc can now emit mir with `--emit mir`][39891]
2973 - [Improved LLVM IR for trivial functions][40367]
2974 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2975 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2976 opportunities found through profiling
2977 - [Improved backtrace formatting when panicking][38165]
2982 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2983 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2984 iteration or reallocation.
2985 - [Simplified HashMap Bucket interface][40561] provides performance
2986 improvements for iterating and cloning.
2987 - [Specialize Vec::from_elem to use calloc][40409]
2988 - [Fixed Race condition in fs::create_dir_all][39799]
2989 - [No longer caching stdio on Windows][40516]
2990 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2991 2.50%~ faster and in one case now 12.50% faster.
2992 - [Optimized `AtomicBool::fetch_nand`][41143]
2997 - [`Child::try_wait`]
2998 - [`HashMap::retain`]
2999 - [`HashSet::retain`]
3001 - [`TcpStream::peek`]
3002 - [`UdpSocket::peek`]
3003 - [`UdpSocket::peek_from`]
3008 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3009 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3010 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3011 - [Added Android build support][cargo/3885]
3012 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3013 of a certain type, for example `cargo build --bins` will build all
3015 - [Added support for haiku][cargo/3952]
3020 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3021 - [Added rust-windbg script for better debugging on Windows][39983]
3022 - [Rust now uses the official cross compiler for NetBSD][40612]
3023 - [rustdoc now accepts `#` at the start of files][40828]
3024 - [Fixed jemalloc support for musl][41168]
3029 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3030 always placed after the sign if it exists and before the digits. With the `#`
3031 flag the zeroes are placed after the prefix and before the digits.
3032 - [Due to the struct field optimisation][40377], using `transmute` on structs
3033 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3034 always been undefined behavior, but is now more likely to break in practice.
3035 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3036 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3037 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3038 - [Overlapping inherent `impl`s are now a hard error][40728]
3039 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3040 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3041 `out.asm` and `out.ll` instead of only one of the filetypes.
3042 - [ calling a function that returns `Self` will no longer work][41805] when
3043 the size of `Self` cannot be statically determined.
3044 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3045 this has caused a few regressions namely:
3047 - Changed the link order of local static/dynamic libraries (respecting the
3048 order on given rather than having the compiler reorder).
3049 - Changed how MinGW is linked, native code linked to dynamic libraries
3050 may require manually linking to the gcc support library (for the native
3053 [38165]: https://github.com/rust-lang/rust/pull/38165
3054 [39799]: https://github.com/rust-lang/rust/pull/39799
3055 [39891]: https://github.com/rust-lang/rust/pull/39891
3056 [39983]: https://github.com/rust-lang/rust/pull/39983
3057 [40043]: https://github.com/rust-lang/rust/pull/40043
3058 [40241]: https://github.com/rust-lang/rust/pull/40241
3059 [40338]: https://github.com/rust-lang/rust/pull/40338
3060 [40367]: https://github.com/rust-lang/rust/pull/40367
3061 [40377]: https://github.com/rust-lang/rust/pull/40377
3062 [40409]: https://github.com/rust-lang/rust/pull/40409
3063 [40516]: https://github.com/rust-lang/rust/pull/40516
3064 [40556]: https://github.com/rust-lang/rust/pull/40556
3065 [40561]: https://github.com/rust-lang/rust/pull/40561
3066 [40589]: https://github.com/rust-lang/rust/pull/40589
3067 [40612]: https://github.com/rust-lang/rust/pull/40612
3068 [40723]: https://github.com/rust-lang/rust/pull/40723
3069 [40728]: https://github.com/rust-lang/rust/pull/40728
3070 [40731]: https://github.com/rust-lang/rust/pull/40731
3071 [40734]: https://github.com/rust-lang/rust/pull/40734
3072 [40805]: https://github.com/rust-lang/rust/pull/40805
3073 [40807]: https://github.com/rust-lang/rust/pull/40807
3074 [40828]: https://github.com/rust-lang/rust/pull/40828
3075 [40870]: https://github.com/rust-lang/rust/pull/40870
3076 [41085]: https://github.com/rust-lang/rust/pull/41085
3077 [41143]: https://github.com/rust-lang/rust/pull/41143
3078 [41168]: https://github.com/rust-lang/rust/pull/41168
3079 [41270]: https://github.com/rust-lang/rust/issues/41270
3080 [41469]: https://github.com/rust-lang/rust/pull/41469
3081 [41805]: https://github.com/rust-lang/rust/issues/41805
3082 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3083 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3084 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3085 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3086 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3087 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3088 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3089 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3090 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3091 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3092 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3093 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3094 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3095 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3098 Version 1.17.0 (2017-04-27)
3099 ===========================
3104 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3105 * [Fields of structs may be initialized without duplicating the field/variable
3106 names][39761]. [RFC 1682]
3107 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3108 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3109 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3110 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3111 `'b`. Soundness fix.
3112 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3113 * [Static variables may contain references to other statics][40027]
3118 * [Exit quickly on only `--emit dep-info`][40336]
3119 * [Make `-C relocation-model` more correctly determine whether the linker
3120 creates a position-independent executable][40245]
3121 * [Add `-C overflow-checks` to directly control whether integer overflow
3123 * [The rustc type checker now checks items on demand instead of in a single
3124 in-order pass][40008]. This is mostly an internal refactoring in support of
3125 future work, including incremental type checking, but also resolves [RFC
3126 1647], allowing `Self` to appear in `impl` `where` clauses.
3127 * [Optimize vtable loads][39995]
3128 * [Turn off vectorization for Emscripten targets][39990]
3129 * [Provide suggestions for unknown macros imported with `use`][39953]
3130 * [Fix ICEs in path resolution][39939]
3131 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
3132 * [Add clearer error message using `&str + &str`][39116]
3143 * [`Ordering::then`]
3144 * [`Ordering::then_with`]
3145 * [`BTreeMap::range`]
3146 * [`BTreeMap::range_mut`]
3147 * [`collections::Bound`]
3148 * [`process::abort`]
3149 * [`ptr::read_unaligned`]
3150 * [`ptr::write_unaligned`]
3151 * [`Result::expect_err`]
3154 * [`Cell::into_inner`]
3160 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
3161 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
3162 * [`String` implements `FromIterator<&char>`][40028]
3163 * `Box` [implements][40009] a number of new conversions:
3164 `From<Box<str>> for String`,
3165 `From<Box<[T]>> for Vec<T>`,
3166 `From<Box<CStr>> for CString`,
3167 `From<Box<OsStr>> for OsString`,
3168 `From<Box<Path>> for PathBuf`,
3169 `Into<Box<str>> for String`,
3170 `Into<Box<[T]>> for Vec<T>`,
3171 `Into<Box<CStr>> for CString`,
3172 `Into<Box<OsStr>> for OsString`,
3173 `Into<Box<Path>> for PathBuf`,
3174 `Default for Box<str>`,
3175 `Default for Box<CStr>`,
3176 `Default for Box<OsStr>`,
3177 `From<&CStr> for Box<CStr>`,
3178 `From<&OsStr> for Box<OsStr>`,
3179 `From<&Path> for Box<Path>`
3180 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
3181 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
3182 * [Slightly optimize `slice::sort`][39538]
3183 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
3184 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
3185 `Box<str>` implements `From<&str>`][39438]
3186 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
3187 `From<(I, u16)> where I: Into<IpAddr>`][39372]
3188 * [`format!` estimates the needed capacity before writing a string][39356]
3189 * [Support unprivileged symlink creation in Windows][38921]
3190 * [`PathBuf` implements `Default`][38764]
3191 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
3192 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
3193 and poor hash functions.
3198 * [Add `cargo check --all`][cargo/3731]
3199 * [Add an option to ignore SSL revocation checking][cargo/3699]
3200 * [Add `cargo run --package`][cargo/3691]
3201 * [Add `required_features`][cargo/3667]
3202 * [Assume `build.rs` is a build script][cargo/3664]
3203 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
3208 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
3210 * [The "Unstable Book" documents nightly-only features][ubook]
3211 * [Improve the style of the sidebar in rustdoc output][40265]
3212 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
3213 * [Fix MSP430 breakage due to `i128`][40257]
3214 * [Preliminary Solaris/SPARCv9 support][39903]
3215 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
3216 run without installing the MSVC runtime.
3217 * [`rustdoc --test` includes file names in test names][39788]
3218 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
3219 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
3220 * [Initial support for `aarch64-unknown-freebsd`][39491]
3221 * [Initial support for `i686-unknown-netbsd`][39426]
3222 * [This release no longer includes the old makefile build system][39431]. Rust
3223 is built with a custom build system, written in Rust, and with Cargo.
3224 * [Add Debug implementations for libcollection structs][39002]
3225 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
3226 * [`--test-threads=0` produces an error][38945]
3227 * [`rustup` installs documentation by default][40526]
3228 * [The Rust source includes NatVis visualizations][39843]. These can be used by
3229 WinDbg and Visual Studio to improve the debugging experience.
3234 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
3235 workaround, either use MSVC 2015 or run vcvars.bat.
3236 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3237 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
3238 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
3240 * [`format!` and `Display::to_string` panic if an underlying formatting
3241 implementation returns an error][40117]. Previously the error was silently
3242 ignored. It is incorrect for `write_fmt` to return an error when writing
3244 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
3245 crates were marked stable and could be accessed from the stable toolchain.
3246 * [Rust git source no longer includes vendored crates][39728]. Those that need
3247 to build with vendored crates should build from release tarballs.
3248 * [Fix inert attributes from `proc_macro_derives`][39572]
3249 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
3250 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
3252 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
3253 existing code generally ignores the type of dead-code unless a type-hint is
3254 provided; this can cause surprising inference interactions particularly around
3255 defaulting. The new code uniformly ignores the result type of dead-code.
3256 * [Tuple-struct constructors with private fields are no longer visible][38932]
3257 * [Lifetime parameters that do not appear in the arguments are now considered
3258 early-bound][38897], resolving a soundness bug (#[32330]). The
3259 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
3261 * [rustdoc: fix doctests with non-feature crate attributes][38161]
3262 * [Make transmuting from fn item types to pointer-sized types a hard
3265 [27787]: https://github.com/rust-lang/rust/issues/27787
3266 [32330]: https://github.com/rust-lang/rust/issues/32330
3267 [34198]: https://github.com/rust-lang/rust/pull/34198
3268 [38161]: https://github.com/rust-lang/rust/pull/38161
3269 [38368]: https://github.com/rust-lang/rust/pull/38368
3270 [38584]: https://github.com/rust-lang/rust/issues/38584
3271 [38661]: https://github.com/rust-lang/rust/pull/38661
3272 [38764]: https://github.com/rust-lang/rust/pull/38764
3273 [38864]: https://github.com/rust-lang/rust/issues/38864
3274 [38897]: https://github.com/rust-lang/rust/pull/38897
3275 [38921]: https://github.com/rust-lang/rust/pull/38921
3276 [38932]: https://github.com/rust-lang/rust/pull/38932
3277 [38945]: https://github.com/rust-lang/rust/pull/38945
3278 [38981]: https://github.com/rust-lang/rust/pull/38981
3279 [39002]: https://github.com/rust-lang/rust/pull/39002
3280 [39116]: https://github.com/rust-lang/rust/pull/39116
3281 [39193]: https://github.com/rust-lang/rust/pull/39193
3282 [39265]: https://github.com/rust-lang/rust/pull/39265
3283 [39356]: https://github.com/rust-lang/rust/pull/39356
3284 [39372]: https://github.com/rust-lang/rust/pull/39372
3285 [39426]: https://github.com/rust-lang/rust/pull/39426
3286 [39431]: https://github.com/rust-lang/rust/pull/39431
3287 [39438]: https://github.com/rust-lang/rust/pull/39438
3288 [39440]: https://github.com/rust-lang/rust/pull/39440
3289 [39485]: https://github.com/rust-lang/rust/pull/39485
3290 [39491]: https://github.com/rust-lang/rust/pull/39491
3291 [39518]: https://github.com/rust-lang/rust/pull/39518
3292 [39538]: https://github.com/rust-lang/rust/pull/39538
3293 [39572]: https://github.com/rust-lang/rust/pull/39572
3294 [39633]: https://github.com/rust-lang/rust/pull/39633
3295 [39642]: https://github.com/rust-lang/rust/pull/39642
3296 [39728]: https://github.com/rust-lang/rust/pull/39728
3297 [39761]: https://github.com/rust-lang/rust/pull/39761
3298 [39788]: https://github.com/rust-lang/rust/pull/39788
3299 [39793]: https://github.com/rust-lang/rust/pull/39793
3300 [39837]: https://github.com/rust-lang/rust/pull/39837
3301 [39843]: https://github.com/rust-lang/rust/pull/39843
3302 [39851]: https://github.com/rust-lang/rust/pull/39851
3303 [39903]: https://github.com/rust-lang/rust/pull/39903
3304 [39939]: https://github.com/rust-lang/rust/pull/39939
3305 [39953]: https://github.com/rust-lang/rust/pull/39953
3306 [39960]: https://github.com/rust-lang/rust/pull/39960
3307 [39990]: https://github.com/rust-lang/rust/pull/39990
3308 [39995]: https://github.com/rust-lang/rust/pull/39995
3309 [40008]: https://github.com/rust-lang/rust/pull/40008
3310 [40009]: https://github.com/rust-lang/rust/pull/40009
3311 [40027]: https://github.com/rust-lang/rust/pull/40027
3312 [40028]: https://github.com/rust-lang/rust/pull/40028
3313 [40037]: https://github.com/rust-lang/rust/pull/40037
3314 [40117]: https://github.com/rust-lang/rust/pull/40117
3315 [40166]: https://github.com/rust-lang/rust/pull/40166
3316 [40245]: https://github.com/rust-lang/rust/pull/40245
3317 [40257]: https://github.com/rust-lang/rust/pull/40257
3318 [40261]: https://github.com/rust-lang/rust/pull/40261
3319 [40265]: https://github.com/rust-lang/rust/pull/40265
3320 [40319]: https://github.com/rust-lang/rust/pull/40319
3321 [40336]: https://github.com/rust-lang/rust/pull/40336
3322 [40526]: https://github.com/rust-lang/rust/pull/40526
3323 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3324 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
3325 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
3326 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
3327 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
3328 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
3329 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
3330 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
3331 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
3332 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
3333 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
3334 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
3335 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
3336 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
3337 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
3338 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
3339 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
3340 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
3341 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
3342 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
3343 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
3344 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
3345 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
3346 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
3347 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
3348 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
3349 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
3350 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
3351 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
3352 [mdbook]: https://crates.io/crates/mdbook
3353 [ubook]: https://doc.rust-lang.org/unstable-book/
3356 Version 1.16.0 (2017-03-16)
3357 ===========================
3362 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3363 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3364 match patterns][38069]
3365 * [Clean up semantics of `self` in an import list][38313]
3366 * [`Self` may appear in `impl` headers][38920]
3367 * [`Self` may appear in struct expressions][39282]
3372 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
3373 a `.rmeta` file containing only crate metadata][38571]. This can be
3374 used by tools like the Rust Language Service to perform
3375 metadata-only builds.
3376 * [Levenshtein based typo suggestions now work in most places, while
3377 previously they worked only for fields and sometimes for local
3378 variables][38927]. Together with the overhaul of "no
3379 resolution"/"unexpected resolution" errors (#[38154]) they result in
3380 large and systematic improvement in resolution diagnostics.
3381 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
3383 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
3384 * [`rustc` no longer attempts to provide "consider using an explicit
3385 lifetime" suggestions][37057]. They were inaccurate.
3390 * [`VecDeque::truncate`]
3391 * [`VecDeque::resize`]
3392 * [`String::insert_str`]
3393 * [`Duration::checked_add`]
3394 * [`Duration::checked_sub`]
3395 * [`Duration::checked_div`]
3396 * [`Duration::checked_mul`]
3399 * [`SocketAddr::is_ipv4`]
3400 * [`SocketAddr::is_ipv6`]
3401 * [`IpAddr::is_ipv4`]
3402 * [`IpAddr::is_ipv6`]
3404 * [`Vec::dedup_by_key`]
3405 * [`Result::unwrap_or_default`]
3406 * [`<*const T>::wrapping_offset`]
3407 * [`<*mut T>::wrapping_offset`]
3408 * `CommandExt::creation_flags`
3409 * [`File::set_permissions`]
3410 * [`String::split_off`]
3415 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
3416 their argument by `Borrow` parameter][37761]
3417 * [All public types in std implement `Debug`][38006]
3418 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
3419 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
3420 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3422 * [std: Fix partial writes in `LineWriter`][38062]
3423 * [std: Clamp max read/write sizes on Unix][38062]
3424 * [Use more specific panic message for `&str` slicing errors][38066]
3425 * [`TcpListener::set_only_v6` is deprecated][38304]. This
3426 functionality cannot be achieved in std currently.
3427 * [`writeln!`, like `println!`, now accepts a form with no string
3428 or formatting arguments, to just print a newline][38469]
3429 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
3430 * [Reduce the size of static data in `std_unicode::tables`][38781]
3431 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
3432 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
3434 * [`Duration` implements `Sum`][38712]
3435 * [`String` implements `ToSocketAddrs`][39048]
3440 * [The `cargo check` command does a type check of a project without
3441 building it][cargo/3296]
3442 * [crates.io will display CI badges from Travis and AppVeyor, if
3443 specified in Cargo.toml][cargo/3546]
3444 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
3445 * [Compilation profiles accept integer values for `debug`, in addition
3446 to `true` and `false`. These are passed to `rustc` as the value to
3447 `-C debuginfo`][cargo/3534]
3448 * [Implement `cargo --version --verbose`][cargo/3604]
3449 * [All builds now output 'dep-info' build dependencies compatible with
3450 make and ninja][cargo/3557]
3451 * [Build all workspace members with `build --all`][cargo/3511]
3452 * [Document all workspace members with `doc --all`][cargo/3515]
3453 * [Path deps outside workspace are not members][cargo/3443]
3458 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
3459 the path to the Rust implementation][38589]
3460 * [The `armv7-linux-androideabi` target no longer enables NEON
3461 extensions, per Google's ABI guide][38413]
3462 * [The stock standard library can be compiled for Redox OS][38401]
3463 * [Rust has initial SPARC support][38726]. Tier 3. No builds
3465 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
3467 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
3472 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3473 match patterns][38069]
3474 * In this release, references to uninhabited types can not be
3475 pattern-matched. This was accidentally allowed in 1.15.
3476 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3477 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3479 * [Clean up semantics of `self` in an import list][38313]
3480 * Reimplemented lifetime elision. This change was almost entirely compatible
3481 with existing code, but it did close a number of small bugs and loopholes,
3482 as well as being more accepting in some other [cases][41105].
3484 [37057]: https://github.com/rust-lang/rust/pull/37057
3485 [37761]: https://github.com/rust-lang/rust/pull/37761
3486 [38006]: https://github.com/rust-lang/rust/pull/38006
3487 [38051]: https://github.com/rust-lang/rust/pull/38051
3488 [38062]: https://github.com/rust-lang/rust/pull/38062
3489 [38062]: https://github.com/rust-lang/rust/pull/38622
3490 [38066]: https://github.com/rust-lang/rust/pull/38066
3491 [38069]: https://github.com/rust-lang/rust/pull/38069
3492 [38131]: https://github.com/rust-lang/rust/pull/38131
3493 [38154]: https://github.com/rust-lang/rust/pull/38154
3494 [38274]: https://github.com/rust-lang/rust/pull/38274
3495 [38304]: https://github.com/rust-lang/rust/pull/38304
3496 [38313]: https://github.com/rust-lang/rust/pull/38313
3497 [38314]: https://github.com/rust-lang/rust/pull/38314
3498 [38327]: https://github.com/rust-lang/rust/pull/38327
3499 [38401]: https://github.com/rust-lang/rust/pull/38401
3500 [38413]: https://github.com/rust-lang/rust/pull/38413
3501 [38469]: https://github.com/rust-lang/rust/pull/38469
3502 [38559]: https://github.com/rust-lang/rust/pull/38559
3503 [38571]: https://github.com/rust-lang/rust/pull/38571
3504 [38580]: https://github.com/rust-lang/rust/pull/38580
3505 [38589]: https://github.com/rust-lang/rust/pull/38589
3506 [38670]: https://github.com/rust-lang/rust/pull/38670
3507 [38712]: https://github.com/rust-lang/rust/pull/38712
3508 [38726]: https://github.com/rust-lang/rust/pull/38726
3509 [38781]: https://github.com/rust-lang/rust/pull/38781
3510 [38798]: https://github.com/rust-lang/rust/pull/38798
3511 [38909]: https://github.com/rust-lang/rust/pull/38909
3512 [38920]: https://github.com/rust-lang/rust/pull/38920
3513 [38927]: https://github.com/rust-lang/rust/pull/38927
3514 [39048]: https://github.com/rust-lang/rust/pull/39048
3515 [39282]: https://github.com/rust-lang/rust/pull/39282
3516 [39379]: https://github.com/rust-lang/rust/pull/39379
3517 [41105]: https://github.com/rust-lang/rust/issues/41105
3518 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3519 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3520 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
3521 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
3522 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
3523 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
3524 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
3525 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
3526 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
3527 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
3528 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
3529 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
3530 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
3531 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
3532 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
3533 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
3534 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
3535 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
3536 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
3537 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
3538 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
3539 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
3540 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
3541 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
3542 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
3543 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
3544 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
3545 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
3546 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
3547 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3550 Version 1.15.1 (2017-02-09)
3551 ===========================
3553 * [Fix IntoIter::as_mut_slice's signature][39466]
3554 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
3556 [39466]: https://github.com/rust-lang/rust/pull/39466
3557 [39523]: https://github.com/rust-lang/rust/pull/39523
3560 Version 1.15.0 (2017-02-02)
3561 ===========================
3566 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
3567 stable. This allows popular code-generating crates like Serde and Diesel to
3568 work ergonomically. [RFC 1681].
3569 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
3570 with curly braces][36868]. Part of [RFC 1506].
3571 * [A number of minor changes to name resolution have been activated][37127].
3572 They add up to more consistent semantics, allowing for future evolution of
3573 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3574 details of what is different. The breaking changes here have been transitioned
3575 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3576 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
3578 * [`?Sized` can be used in `where` clauses][37791]
3579 * [There is now a limit on the size of monomorphized types and it can be
3580 modified with the `#![type_size_limit]` crate attribute, similarly to
3581 the `#![recursion_limit]` attribute][37789]
3586 * [On Windows, the compiler will apply dllimport attributes when linking to
3587 extern functions][37973]. Additional attributes and flags can control which
3588 library kind is linked and its name. [RFC 1717].
3589 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3590 * [The `--test` flag works with procedural macro crates][38107]
3591 * [Fix `extern "aapcs" fn` ABI][37814]
3592 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
3593 * [The `format!` expander recognizes incorrect `printf` and shell-style
3594 formatting directives and suggests the correct format][37613].
3595 * [Only report one error for all unused imports in an import list][37456]
3597 Compiler Performance
3598 --------------------
3600 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
3601 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
3602 * [Don't clone in `UnificationTable::probe`][37848]
3603 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
3604 * [Use small vectors in type walker][37760]
3605 * [Macro expansion performance was improved][37701]
3606 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
3607 * [Replace FNV with a faster hash function][37229]
3612 * [`std::iter::Iterator::min_by`]
3613 * [`std::iter::Iterator::max_by`]
3614 * [`std::os::*::fs::FileExt`]
3615 * [`std::sync::atomic::Atomic*::get_mut`]
3616 * [`std::sync::atomic::Atomic*::into_inner`]
3617 * [`std::vec::IntoIter::as_slice`]
3618 * [`std::vec::IntoIter::as_mut_slice`]
3619 * [`std::sync::mpsc::Receiver::try_iter`]
3620 * [`std::os::unix::process::CommandExt::before_exec`]
3621 * [`std::rc::Rc::strong_count`]
3622 * [`std::rc::Rc::weak_count`]
3623 * [`std::sync::Arc::strong_count`]
3624 * [`std::sync::Arc::weak_count`]
3625 * [`std::char::encode_utf8`]
3626 * [`std::char::encode_utf16`]
3627 * [`std::cell::Ref::clone`]
3628 * [`std::io::Take::into_inner`]
3633 * [The standard sorting algorithm has been rewritten for dramatic performance
3634 improvements][38192]. It is a hybrid merge sort, drawing influences from
3635 Timsort. Previously it was a naive merge sort.
3636 * [`Iterator::nth` no longer has a `Sized` bound][38134]
3637 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
3639 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
3640 and `char_indices().last()`][37882]
3641 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
3642 * [Chinese characters display correctly in `fmt::Debug`][37855]
3643 * [Derive `Default` for `Duration`][37699]
3644 * [Support creation of anonymous pipes on WinXP/2k][37677]
3645 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
3646 * [Don't pass overlapped handles to processes][38835]
3651 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3652 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3653 should instead check the variable at runtime with `std::env`. That the value
3654 was set at build time was a bug, and incorrect when cross-compiling. This
3655 change is known to cause breakage.
3656 * [Add `--all` flag to `cargo test`][cargo/3221]
3657 * [Compile statically against the MSVC CRT][cargo/3363]
3658 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
3659 * [Link OpenSSL statically on OSX][cargo/3311]
3660 * [Apply new fingerprinting to build dir outputs][cargo/3310]
3661 * [Test for bad path overrides with summaries][cargo/3336]
3662 * [Require `cargo install --vers` to take a semver version][cargo/3338]
3663 * [Fix retrying crate downloads for network errors][cargo/3348]
3664 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
3665 * [Emit more info on --message-format=json][cargo/3319]
3666 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
3667 * [Don't ignore errors in workspace manifest][cargo/3409]
3668 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
3673 * [Test runners (binaries built with `--test`) now support a `--list` argument
3674 that lists the tests it contains][38185]
3675 * [Test runners now support a `--exact` argument that makes the test filter
3676 match exactly, instead of matching only a substring of the test name][38181]
3677 * [rustdoc supports a `--playground-url` flag][37763]
3678 * [rustdoc provides more details about `#[should_panic]` errors][37749]
3683 * [The Rust build system is now written in Rust][37817]. The Makefiles may
3684 continue to be used in this release by passing `--disable-rustbuild` to the
3685 configure script, but they will be deleted soon. Note that the new build
3686 system uses a different on-disk layout that will likely affect any scripts
3688 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
3690 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
3691 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
3697 * [A number of minor changes to name resolution have been activated][37127].
3698 They add up to more consistent semantics, allowing for future evolution of
3699 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3700 details of what is different. The breaking changes here have been transitioned
3701 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3702 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3703 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3704 should instead check the variable at runtime with `std::env`. That the value
3705 was set at build time was a bug, and incorrect when cross-compiling. This
3706 change is known to cause breakage.
3707 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
3708 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
3709 1.10 and is now an error by default. It will become a hard error in the near
3711 * [The semantics relating modules to file system directories are changing in
3712 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
3713 lint, which is a warning in this release, and will become a hard error in the
3715 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3716 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
3717 the underlying iterator][37834]
3719 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
3720 [33685]: https://github.com/rust-lang/rust/issues/33685
3721 [36868]: https://github.com/rust-lang/rust/pull/36868
3722 [37127]: https://github.com/rust-lang/rust/pull/37127
3723 [37229]: https://github.com/rust-lang/rust/pull/37229
3724 [37456]: https://github.com/rust-lang/rust/pull/37456
3725 [37527]: https://github.com/rust-lang/rust/pull/37527
3726 [37602]: https://github.com/rust-lang/rust/pull/37602
3727 [37613]: https://github.com/rust-lang/rust/pull/37613
3728 [37615]: https://github.com/rust-lang/rust/pull/37615
3729 [37636]: https://github.com/rust-lang/rust/pull/37636
3730 [37627]: https://github.com/rust-lang/rust/pull/37627
3731 [37642]: https://github.com/rust-lang/rust/pull/37642
3732 [37677]: https://github.com/rust-lang/rust/pull/37677
3733 [37699]: https://github.com/rust-lang/rust/pull/37699
3734 [37701]: https://github.com/rust-lang/rust/pull/37701
3735 [37705]: https://github.com/rust-lang/rust/pull/37705
3736 [37749]: https://github.com/rust-lang/rust/pull/37749
3737 [37760]: https://github.com/rust-lang/rust/pull/37760
3738 [37763]: https://github.com/rust-lang/rust/pull/37763
3739 [37764]: https://github.com/rust-lang/rust/pull/37764
3740 [37789]: https://github.com/rust-lang/rust/pull/37789
3741 [37791]: https://github.com/rust-lang/rust/pull/37791
3742 [37814]: https://github.com/rust-lang/rust/pull/37814
3743 [37817]: https://github.com/rust-lang/rust/pull/37817
3744 [37834]: https://github.com/rust-lang/rust/pull/37834
3745 [37848]: https://github.com/rust-lang/rust/pull/37848
3746 [37855]: https://github.com/rust-lang/rust/pull/37855
3747 [37882]: https://github.com/rust-lang/rust/pull/37882
3748 [37888]: https://github.com/rust-lang/rust/pull/37888
3749 [37973]: https://github.com/rust-lang/rust/pull/37973
3750 [37979]: https://github.com/rust-lang/rust/pull/37979
3751 [38086]: https://github.com/rust-lang/rust/pull/38086
3752 [38107]: https://github.com/rust-lang/rust/pull/38107
3753 [38117]: https://github.com/rust-lang/rust/pull/38117
3754 [38134]: https://github.com/rust-lang/rust/pull/38134
3755 [38146]: https://github.com/rust-lang/rust/pull/38146
3756 [38181]: https://github.com/rust-lang/rust/pull/38181
3757 [38182]: https://github.com/rust-lang/rust/pull/38182
3758 [38185]: https://github.com/rust-lang/rust/pull/38185
3759 [38192]: https://github.com/rust-lang/rust/pull/38192
3760 [38279]: https://github.com/rust-lang/rust/pull/38279
3761 [38835]: https://github.com/rust-lang/rust/pull/38835
3762 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3763 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3764 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
3765 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
3766 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
3767 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
3768 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
3769 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
3770 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
3771 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
3772 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
3773 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
3774 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
3775 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
3776 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
3777 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
3778 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
3779 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
3780 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
3781 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
3782 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
3783 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
3784 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
3785 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
3786 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
3787 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
3788 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
3789 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
3790 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
3791 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
3792 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
3793 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
3794 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
3795 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
3796 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
3797 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
3798 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
3799 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
3802 Version 1.14.0 (2016-12-22)
3803 ===========================
3808 * [`..` matches multiple tuple fields in enum variants, structs
3809 and tuples][36843]. [RFC 1492].
3810 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
3811 * [`use *` and `use ::*` both glob-import from the crate root][37367]
3812 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
3813 dereferencing][36822]
3818 * [Mark enums with non-zero discriminant as non-zero][37224]
3819 * [Lower-case `static mut` names are linted like other
3820 statics and consts][37162]
3821 * [Fix ICE on some macros in const integer positions
3822 (e.g. `[u8; m!()]`)][36819]
3823 * [Improve error message and snippet for "did you mean `x`"][36798]
3824 * [Add a panic-strategy field to the target specification][36794]
3825 * [Include LLVM version in `--version --verbose`][37200]
3827 Compile-time Optimizations
3828 --------------------------
3830 * [Improve macro expansion performance][37569]
3831 * [Shrink `Expr_::ExprInlineAsm`][37445]
3832 * [Replace all uses of SHA-256 with BLAKE2b][37439]
3833 * [Reduce the number of bytes hashed by `IchHasher`][37427]
3834 * [Avoid more allocations when compiling html5ever][37373]
3835 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
3836 * [Avoid some allocations in the macro parser][37318]
3837 * [Use a faster deflate setting][37298]
3838 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
3839 during interning of slices][37270]
3840 * [Optimize `write_metadata`][37267]
3841 * [Don't process obligation forest cycles when stalled][37231]
3842 * [Avoid many `CrateConfig` clones][37161]
3843 * [Optimize `Substs::super_fold_with`][37108]
3844 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
3845 * [Speed up `plug_leaks`][36917]
3850 * [`println!()`, with no arguments, prints newline][36825].
3851 Previously, an empty string was required to achieve the same.
3852 * [`Wrapping` impls standard binary and unary operators, as well as
3853 the `Sum` and `Product` iterators][37356]
3854 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
3856 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
3857 `VecDeque` iterators][37315]
3858 * [Improve `SipHasher` performance on small values][37312]
3859 * [Add Iterator trait TrustedLen to enable better FromIterator /
3861 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
3862 * [`ReadDir` implements `Debug`][37221]
3863 * [Implement `RefUnwindSafe` for atomic types][37178]
3864 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
3865 * [Avoid allocations in `Decoder::read_str`][37064]
3866 * [`io::Error` implements `From<io::ErrorKind>`][37037]
3867 * [Impl `Debug` for raw pointers to unsized data][36880]
3868 * [Don't reuse `HashMap` random seeds][37470]
3869 * [The internal memory layout of `HashMap` is more cache-friendly, for
3870 significant improvements in some operations][36692]
3871 * [`HashMap` uses less memory on 32-bit architectures][36595]
3872 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
3877 * [Expose rustc cfg values to build scripts][cargo/3243]
3878 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
3879 * [Fix passing --features when testing multiple packages][cargo/3280]
3880 * [Use a single profile set per workspace][cargo/3249]
3881 * [Load `replace` sections from lock files][cargo/3220]
3882 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
3887 * [rustup is the recommended Rust installation method][1.14rustup]
3888 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
3889 S390x. These are [tier 2] platforms and may have major defects. Follow the
3890 instructions on the website to install, or add the targets to an existing
3891 installation with `rustup target add`. The new target triples are:
3892 - `mips-unknown-linux-gnu`
3893 - `mipsel-unknown-linux-gnu`
3894 - `mips64-unknown-linux-gnuabi64`
3895 - `mips64el-unknown-linux-gnuabi64 `
3896 - `powerpc-unknown-linux-gnu`
3897 - `powerpc64-unknown-linux-gnu`
3898 - `powerpc64le-unknown-linux-gnu`
3899 - `s390x-unknown-linux-gnu `
3900 * This release includes target (std) builds for ARM Linux running MUSL
3901 libc. These are [tier 2] platforms and may have major defects. Add the
3902 following triples to an existing rustup installation with `rustup target add`:
3903 - `arm-unknown-linux-musleabi`
3904 - `arm-unknown-linux-musleabihf`
3905 - `armv7-unknown-linux-musleabihf`
3906 * This release includes [experimental support for WebAssembly][1.14wasm], via
3907 the `wasm32-unknown-emscripten` target. This target is known to have major
3908 defects. Please test, report, and fix.
3909 * rustup no longer installs documentation by default. Run `rustup
3910 component add rust-docs` to install.
3911 * [Fix line stepping in debugger][37310]
3912 * [Enable line number debuginfo in releases][37280]
3917 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3918 * [Add support for Fuchsia OS][37313]
3919 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3924 * [A number of forward-compatibility lints used by the compiler
3925 to gradually introduce language changes have been converted
3926 to deny by default][36894]:
3927 - ["use of inaccessible extern crate erroneously allowed"][36886]
3928 - ["type parameter default erroneously allowed in invalid location"][36887]
3929 - ["detects super or self keywords at the beginning of global path"][36888]
3930 - ["two overlapping inherent impls define an item with the same name
3931 were erroneously allowed"][36889]
3932 - ["floating-point constants cannot be used in patterns"][36890]
3933 - ["constants of struct or enum type can only be used in a pattern if
3934 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3935 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3936 * [Prohibit patterns in trait methods without bodies][37378]
3937 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3938 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3939 * [The `$crate` macro variable is accepted in fewer locations][37213]
3940 * [Impls specifying extra region requirements beyond the trait
3941 they implement are rejected][37167]
3942 * [Enums may not be unsized][37111]. Unsized enums are intended to
3943 work but never have. For now they are forbidden.
3944 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3946 [tier 2]: https://forge.rust-lang.org/platform-support.html
3947 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3948 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3949 [36430]: https://github.com/rust-lang/rust/pull/36430
3950 [36595]: https://github.com/rust-lang/rust/pull/36595
3951 [36595]: https://github.com/rust-lang/rust/pull/36595
3952 [36692]: https://github.com/rust-lang/rust/pull/36692
3953 [36767]: https://github.com/rust-lang/rust/pull/36767
3954 [36794]: https://github.com/rust-lang/rust/pull/36794
3955 [36798]: https://github.com/rust-lang/rust/pull/36798
3956 [36819]: https://github.com/rust-lang/rust/pull/36819
3957 [36822]: https://github.com/rust-lang/rust/pull/36822
3958 [36825]: https://github.com/rust-lang/rust/pull/36825
3959 [36843]: https://github.com/rust-lang/rust/pull/36843
3960 [36880]: https://github.com/rust-lang/rust/pull/36880
3961 [36886]: https://github.com/rust-lang/rust/issues/36886
3962 [36887]: https://github.com/rust-lang/rust/issues/36887
3963 [36888]: https://github.com/rust-lang/rust/issues/36888
3964 [36889]: https://github.com/rust-lang/rust/issues/36889
3965 [36890]: https://github.com/rust-lang/rust/issues/36890
3966 [36891]: https://github.com/rust-lang/rust/issues/36891
3967 [36892]: https://github.com/rust-lang/rust/issues/36892
3968 [36894]: https://github.com/rust-lang/rust/pull/36894
3969 [36917]: https://github.com/rust-lang/rust/pull/36917
3970 [36993]: https://github.com/rust-lang/rust/pull/36993
3971 [37037]: https://github.com/rust-lang/rust/pull/37037
3972 [37064]: https://github.com/rust-lang/rust/pull/37064
3973 [37094]: https://github.com/rust-lang/rust/pull/37094
3974 [37108]: https://github.com/rust-lang/rust/pull/37108
3975 [37111]: https://github.com/rust-lang/rust/pull/37111
3976 [37161]: https://github.com/rust-lang/rust/pull/37161
3977 [37162]: https://github.com/rust-lang/rust/pull/37162
3978 [37167]: https://github.com/rust-lang/rust/pull/37167
3979 [37178]: https://github.com/rust-lang/rust/pull/37178
3980 [37200]: https://github.com/rust-lang/rust/pull/37200
3981 [37213]: https://github.com/rust-lang/rust/pull/37213
3982 [37221]: https://github.com/rust-lang/rust/pull/37221
3983 [37224]: https://github.com/rust-lang/rust/pull/37224
3984 [37230]: https://github.com/rust-lang/rust/pull/37230
3985 [37231]: https://github.com/rust-lang/rust/pull/37231
3986 [37247]: https://github.com/rust-lang/rust/pull/37247
3987 [37267]: https://github.com/rust-lang/rust/pull/37267
3988 [37270]: https://github.com/rust-lang/rust/pull/37270
3989 [37273]: https://github.com/rust-lang/rust/pull/37273
3990 [37280]: https://github.com/rust-lang/rust/pull/37280
3991 [37298]: https://github.com/rust-lang/rust/pull/37298
3992 [37306]: https://github.com/rust-lang/rust/pull/37306
3993 [37310]: https://github.com/rust-lang/rust/pull/37310
3994 [37312]: https://github.com/rust-lang/rust/pull/37312
3995 [37313]: https://github.com/rust-lang/rust/pull/37313
3996 [37315]: https://github.com/rust-lang/rust/pull/37315
3997 [37318]: https://github.com/rust-lang/rust/pull/37318
3998 [37322]: https://github.com/rust-lang/rust/pull/37322
3999 [37326]: https://github.com/rust-lang/rust/pull/37326
4000 [37351]: https://github.com/rust-lang/rust/pull/37351
4001 [37356]: https://github.com/rust-lang/rust/pull/37356
4002 [37367]: https://github.com/rust-lang/rust/pull/37367
4003 [37373]: https://github.com/rust-lang/rust/pull/37373
4004 [37378]: https://github.com/rust-lang/rust/pull/37378
4005 [37389]: https://github.com/rust-lang/rust/pull/37389
4006 [37392]: https://github.com/rust-lang/rust/pull/37392
4007 [37427]: https://github.com/rust-lang/rust/pull/37427
4008 [37439]: https://github.com/rust-lang/rust/pull/37439
4009 [37445]: https://github.com/rust-lang/rust/pull/37445
4010 [37470]: https://github.com/rust-lang/rust/pull/37470
4011 [37569]: https://github.com/rust-lang/rust/pull/37569
4012 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4013 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4014 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4015 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4016 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4017 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4018 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4021 Version 1.13.0 (2016-11-10)
4022 ===========================
4027 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4028 errors, like the `try!` macro, described in [RFC 0243].
4029 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4030 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4031 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4032 * [Fix lifetime rules for 'if' conditions][36029]
4033 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4038 * [Add the `-C link-arg` argument][36574]
4039 * [Remove the old AST-based backend from rustc_trans][35764]
4040 * [Don't enable NEON by default on armv7 Linux][35814]
4041 * [Fix debug line number info for macro expansions][35238]
4042 * [Do not emit "class method" debuginfo for types that are not
4043 DICompositeType][36008]
4044 * [Warn about multiple conflicting #[repr] hints][34623]
4045 * [When sizing DST, don't double-count nested struct prefixes][36351]
4046 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4047 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4048 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4049 * [Expand macros without recursing to avoid stack overflows][36214]
4054 * [Replace macro backtraces with labeled local uses][35702]
4055 * [Improve error message for misplaced doc comments][33922]
4056 * [Buffer unix and lock windows to prevent message interleaving][35975]
4057 * [Update lifetime errors to specifically note temporaries][36171]
4058 * [Special case a few colors for Windows][36178]
4059 * [Suggest `use self` when such an import resolves][36289]
4060 * [Be more specific when type parameter shadows primitive type][36338]
4061 * Many minor improvements
4063 Compile-time Optimizations
4064 --------------------------
4066 * [Compute and cache HIR hashes at beginning][35854]
4067 * [Don't hash types in loan paths][36004]
4068 * [Cache projections in trans][35761]
4069 * [Optimize the parser's last token handling][36527]
4070 * [Only instantiate #[inline] functions in codegen units referencing
4071 them][36524]. This leads to big improvements in cases where crates export
4072 define many inline functions without using them directly.
4073 * [Lazily allocate TypedArena's first chunk][36592]
4074 * [Don't allocate during default HashSet creation][36734]
4081 * [`overflowing_abs`]
4082 * [`RefCell::try_borrow`]
4083 * [`RefCell::try_borrow_mut`]
4088 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4089 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4091 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4092 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4093 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4094 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4095 * [Use arc4rand on FreeBSD][35884]
4096 * [memrchr: Correct aligned offset computation][35969]
4097 * [Improve Demangling of Rust Symbols][36059]
4098 * [Use monotonic time in condition variables][35048]
4099 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4100 * [Implement conversion traits for `char`][35755]
4101 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4102 * [Zero first byte of CString on drop][36264]
4103 * [Inherit overflow checks for sum and product][36372]
4104 * [Add missing Eq implementations][36423]
4105 * [Implement `Debug` for `DirEntry`][36631]
4106 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4108 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4109 * [Implement more traits for `std::io::ErrorKind`][35911]
4110 * [Optimize BinaryHeap bounds checking][36072]
4111 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4112 `extend_with_element`][36355]
4113 * [Fix overflow checking in unsigned pow()][34942]
4118 * This release includes security fixes to both curl and OpenSSL.
4119 * [Fix transitive doctests when panic=abort][cargo/3021]
4120 * [Add --all-features flag to cargo][cargo/3038]
4121 * [Reject path-based dependencies in `cargo package`][cargo/3060]
4122 * [Don't parse the home directory more than once][cargo/3078]
4123 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4124 * [Update OpenSSL to 1.0.2j][cargo/3121]
4125 * [Add license and license_file to cargo metadata output][cargo/3110]
4126 * [Make crates-io registry URL optional in config; ignore all changes to
4127 source.crates-io][cargo/3089]
4128 * [Don't download dependencies from other platforms][cargo/3123]
4129 * [Build transitive dev-dependencies when needed][cargo/3125]
4130 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
4131 * [Avoid updating registry when adding existing deps][cargo/3144]
4132 * [Warn about path overrides that won't work][cargo/3136]
4133 * [Use workspaces during `cargo install`][cargo/3146]
4134 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
4135 * [Add --message-format flag][cargo/3000]
4136 * [Pass target environment for rustdoc][cargo/3205]
4137 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
4138 * [Update curl and curl-sys][cargo/3241]
4139 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
4144 * [rustdoc: Add the `--sysroot` argument][36586]
4145 * [rustdoc: Fix a couple of issues with the search results][35655]
4146 * [rustdoc: remove the `!` from macro URLs and titles][35234]
4147 * [gdb: Fix pretty-printing special-cased Rust types][35585]
4148 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
4153 * [Remove unmaintained style guide][35124]
4154 * [Add s390x support][36369]
4155 * [Initial work at Haiku OS support][36727]
4156 * [Add mips-uclibc targets][35734]
4157 * [Crate-ify compiler-rt into compiler-builtins][35021]
4158 * [Add rustc version info (git hash + date) to dist tarball][36213]
4159 * Many documentation improvements
4164 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4165 * [Deny (by default) transmuting from fn item types to pointer-sized
4166 types][34923]. Continuing the long transition to zero-sized fn items,
4168 * [Fix `#[derive]` for empty tuple structs/variants][35728].
4170 * [Issue deprecation warnings for safe accesses to extern statics][36173]
4171 * [Fix lifetime rules for 'if' conditions][36029].
4172 * [Inherit overflow checks for sum and product][36372].
4173 * [Forbid user-defined macros named "macro_rules"][36730].
4175 [33922]: https://github.com/rust-lang/rust/pull/33922
4176 [34623]: https://github.com/rust-lang/rust/pull/34623
4177 [34923]: https://github.com/rust-lang/rust/pull/34923
4178 [34942]: https://github.com/rust-lang/rust/pull/34942
4179 [34982]: https://github.com/rust-lang/rust/pull/34982
4180 [35021]: https://github.com/rust-lang/rust/pull/35021
4181 [35048]: https://github.com/rust-lang/rust/pull/35048
4182 [35074]: https://github.com/rust-lang/rust/pull/35074
4183 [35124]: https://github.com/rust-lang/rust/pull/35124
4184 [35234]: https://github.com/rust-lang/rust/pull/35234
4185 [35238]: https://github.com/rust-lang/rust/pull/35238
4186 [35354]: https://github.com/rust-lang/rust/pull/35354
4187 [35559]: https://github.com/rust-lang/rust/pull/35559
4188 [35585]: https://github.com/rust-lang/rust/pull/35585
4189 [35627]: https://github.com/rust-lang/rust/pull/35627
4190 [35655]: https://github.com/rust-lang/rust/pull/35655
4191 [35702]: https://github.com/rust-lang/rust/pull/35702
4192 [35707]: https://github.com/rust-lang/rust/pull/35707
4193 [35728]: https://github.com/rust-lang/rust/pull/35728
4194 [35734]: https://github.com/rust-lang/rust/pull/35734
4195 [35755]: https://github.com/rust-lang/rust/pull/35755
4196 [35761]: https://github.com/rust-lang/rust/pull/35761
4197 [35764]: https://github.com/rust-lang/rust/pull/35764
4198 [35814]: https://github.com/rust-lang/rust/pull/35814
4199 [35854]: https://github.com/rust-lang/rust/pull/35854
4200 [35871]: https://github.com/rust-lang/rust/pull/35871
4201 [35884]: https://github.com/rust-lang/rust/pull/35884
4202 [35911]: https://github.com/rust-lang/rust/pull/35911
4203 [35969]: https://github.com/rust-lang/rust/pull/35969
4204 [35975]: https://github.com/rust-lang/rust/pull/35975
4205 [36004]: https://github.com/rust-lang/rust/pull/36004
4206 [36008]: https://github.com/rust-lang/rust/pull/36008
4207 [36014]: https://github.com/rust-lang/rust/pull/36014
4208 [36029]: https://github.com/rust-lang/rust/pull/36029
4209 [36059]: https://github.com/rust-lang/rust/pull/36059
4210 [36072]: https://github.com/rust-lang/rust/pull/36072
4211 [36101]: https://github.com/rust-lang/rust/pull/36101
4212 [36104]: https://github.com/rust-lang/rust/pull/36104
4213 [36171]: https://github.com/rust-lang/rust/pull/36171
4214 [36173]: https://github.com/rust-lang/rust/pull/36173
4215 [36178]: https://github.com/rust-lang/rust/pull/36178
4216 [36213]: https://github.com/rust-lang/rust/pull/36213
4217 [36214]: https://github.com/rust-lang/rust/pull/36214
4218 [36264]: https://github.com/rust-lang/rust/pull/36264
4219 [36266]: https://github.com/rust-lang/rust/pull/36266
4220 [36289]: https://github.com/rust-lang/rust/pull/36289
4221 [36338]: https://github.com/rust-lang/rust/pull/36338
4222 [36351]: https://github.com/rust-lang/rust/pull/36351
4223 [36355]: https://github.com/rust-lang/rust/pull/36355
4224 [36369]: https://github.com/rust-lang/rust/pull/36369
4225 [36372]: https://github.com/rust-lang/rust/pull/36372
4226 [36423]: https://github.com/rust-lang/rust/pull/36423
4227 [36482]: https://github.com/rust-lang/rust/pull/36482
4228 [36505]: https://github.com/rust-lang/rust/pull/36505
4229 [36524]: https://github.com/rust-lang/rust/pull/36524
4230 [36527]: https://github.com/rust-lang/rust/pull/36527
4231 [36551]: https://github.com/rust-lang/rust/pull/36551
4232 [36574]: https://github.com/rust-lang/rust/pull/36574
4233 [36586]: https://github.com/rust-lang/rust/pull/36586
4234 [36592]: https://github.com/rust-lang/rust/pull/36592
4235 [36631]: https://github.com/rust-lang/rust/pull/36631
4236 [36639]: https://github.com/rust-lang/rust/pull/36639
4237 [36721]: https://github.com/rust-lang/rust/pull/36721
4238 [36727]: https://github.com/rust-lang/rust/pull/36727
4239 [36730]: https://github.com/rust-lang/rust/pull/36730
4240 [36734]: https://github.com/rust-lang/rust/pull/36734
4241 [36754]: https://github.com/rust-lang/rust/pull/36754
4242 [36995]: https://github.com/rust-lang/rust/pull/36995
4243 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
4244 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
4245 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4246 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
4247 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
4248 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
4249 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
4250 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
4251 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
4252 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
4253 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
4254 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
4255 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
4256 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
4257 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
4258 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
4259 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
4260 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
4261 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
4262 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
4263 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
4264 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
4265 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
4266 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
4267 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
4268 [rustup]: https://www.rustup.rs
4269 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
4270 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
4271 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
4272 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
4273 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
4274 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
4275 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
4278 Version 1.12.1 (2016-10-20)
4279 ===========================
4284 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
4285 * [Confusion with double negation and booleans][36856]
4286 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
4287 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
4288 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
4289 * [Corrupted memory after updated to 1.12][36936]
4290 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
4291 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
4292 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
4294 [36381]: https://github.com/rust-lang/rust/issues/36381
4295 [36856]: https://github.com/rust-lang/rust/issues/36856
4296 [36875]: https://github.com/rust-lang/rust/issues/36875
4297 [36924]: https://github.com/rust-lang/rust/issues/36924
4298 [36926]: https://github.com/rust-lang/rust/issues/36926
4299 [36936]: https://github.com/rust-lang/rust/issues/36936
4300 [37026]: https://github.com/rust-lang/rust/issues/37026
4301 [37112]: https://github.com/rust-lang/rust/issues/37112
4302 [37153]: https://github.com/rust-lang/rust/issues/37153
4305 Version 1.12.0 (2016-09-29)
4306 ===========================
4311 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4312 This translation pass is far simpler than the previous AST->LLVM pass, and
4313 creates opportunities to perform new optimizations directly on the MIR. It
4314 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4315 * [`rustc` presents a new, more readable error format, along with
4316 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4317 Most common editors supporting Rust have been updated to work with it. It was
4318 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4323 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4324 This translation pass is far simpler than the previous AST->LLVM pass, and
4325 creates opportunities to perform new optimizations directly on the MIR. It
4326 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4327 * [Print the Rust target name, not the LLVM target name, with
4328 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
4329 * [The computation of `TypeId` is correct in some cases where it was previously
4330 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
4331 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
4332 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
4333 `--print relocation-models`, and `--print code-models` print the available
4334 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
4335 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
4336 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
4337 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
4338 These targets produce statically-linked binaries. There are no binary release
4344 * [`rustc` presents a new, more readable error format, along with
4345 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4346 Most common editors supporting Rust have been updated to work with it. It was
4347 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4348 * [In error descriptions, references are now described in plain English,
4349 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
4350 * [In error type descriptions, unknown numeric types are named `{integer}` or
4351 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
4352 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
4357 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
4358 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
4359 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
4360 useful](https://github.com/rust-lang/rust/pull/34908)
4361 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
4362 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
4363 * [Semicolons are properly required as statement delimiters inside
4364 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
4365 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4370 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
4371 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
4372 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
4373 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
4374 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
4375 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
4376 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
4377 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
4378 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
4379 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
4380 Both on Unix and Windows.
4381 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
4382 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
4383 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
4384 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
4385 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
4386 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
4387 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
4388 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
4393 * [The `format!` macro and friends now allow a single argument to be formatted
4394 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
4395 * [The lifetime bounds on `[T]::binary_search_by` and
4396 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
4397 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
4398 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
4399 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
4400 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
4401 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
4402 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
4403 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
4404 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
4405 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
4406 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
4407 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
4408 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
4409 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
4410 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
4411 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
4412 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
4413 * [`mpsc::sync_channel` `Receiver`s return any available message before
4414 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
4415 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
4416 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
4421 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
4422 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
4423 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
4424 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
4425 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
4426 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
4427 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
4428 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
4429 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
4430 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
4431 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
4432 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
4433 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
4434 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
4435 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
4436 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
4441 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
4442 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
4447 * [Test binaries now support a `--test-threads` argument to specify the number
4448 of threads used to run tests, and which acts the same as the
4449 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
4450 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
4451 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
4452 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4453 * [Rust releases now come with source packages that can be installed by rustup
4454 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
4455 The resulting source code can be used by tools and IDES, located in the
4456 sysroot under `lib/rustlib/src`.
4461 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
4462 * Many minor improvements to the documentation.
4463 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
4468 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
4469 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
4470 * [When formatting strings, if "precision" is specified, the "fill",
4471 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
4472 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
4475 Version 1.11.0 (2016-08-18)
4476 ===========================
4481 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4482 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
4483 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
4484 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
4485 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
4490 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
4491 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
4492 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
4493 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
4494 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
4495 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
4496 (in libcore - previously stabilized in libstd)
4497 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
4498 (in libcore - previously stabilized in libstd)
4499 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
4500 (in libcore - previously stabilized in libstd)
4501 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
4502 (in libcore - previously stabilized in libstd)
4503 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4504 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4505 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
4506 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
4511 * [The `thread_local!` macro supports multiple definitions in a single
4512 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
4513 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
4514 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
4515 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
4516 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
4517 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
4518 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
4519 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
4524 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
4525 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
4526 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
4527 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
4528 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
4529 and `-vv` prints warnings for all crates.
4530 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
4531 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
4532 This provides room for expansion by arbitrary tools.
4533 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
4534 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
4535 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
4536 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
4537 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
4538 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
4539 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
4544 * [Caching projections speeds up type check dramatically for some
4545 workloads](https://github.com/rust-lang/rust/pull/33816)
4546 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
4547 This hasher is faster, but is believed to provide sufficient
4548 protection from collision attacks.
4549 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
4554 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
4555 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
4556 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
4557 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
4558 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
4563 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
4564 * [When emitting debug info, rustc emits frame pointers for closures,
4565 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
4566 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4567 * Many more errors have been given error codes and extended
4569 * API documentation continues to be improved, with many new examples
4574 * [rustc no longer hangs when dependencies recursively re-export
4575 submodules](https://github.com/rust-lang/rust/pull/34542)
4576 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
4577 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
4578 rewritten](https://github.com/rust-lang/rust/pull/33895)
4579 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
4580 No targets use this yet, but it works toward AVR support.
4585 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
4586 * [The new follow-set rules that place restrictions on `macro_rules!`
4587 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
4588 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
4589 and has been a warning since 1.10.
4590 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
4591 This causes breakage in some corner cases.
4594 Version 1.10.0 (2016-07-07)
4595 ===========================
4600 * [Allow `concat_idents!` in type positions as well as in expression
4601 positions](https://github.com/rust-lang/rust/pull/33735).
4602 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
4603 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
4604 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
4605 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
4606 * [`panic!` can be converted to a runtime abort with the
4607 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
4608 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4609 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
4610 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
4611 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
4612 Note that Cargo does not yet directly support cdylibs.
4617 * `os::windows::fs::OpenOptionsExt::access_mode`
4618 * `os::windows::fs::OpenOptionsExt::share_mode`
4619 * `os::windows::fs::OpenOptionsExt::custom_flags`
4620 * `os::windows::fs::OpenOptionsExt::attributes`
4621 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
4622 * `os::unix::fs::OpenOptionsExt::custom_flags`
4623 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
4624 * `Default for sync::Weak`
4625 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
4626 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
4627 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
4628 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
4629 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
4630 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
4631 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
4632 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
4633 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
4634 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
4635 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
4636 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
4637 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
4638 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
4639 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
4640 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
4641 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
4642 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
4643 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
4644 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
4645 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
4646 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
4647 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
4648 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
4649 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
4650 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4651 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4652 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4653 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4654 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
4655 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
4656 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
4657 * Read/Write/RawFd impls for `UnixStream`
4658 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
4659 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
4660 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
4661 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
4662 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
4663 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
4664 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
4665 * RawFd impls for `UnixListener`
4666 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
4667 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
4668 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
4669 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
4670 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
4671 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
4672 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
4673 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
4674 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
4675 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
4676 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
4677 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
4678 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
4679 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
4680 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
4681 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
4682 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
4683 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
4684 * RawFd impls for `UnixDatagram`
4685 * `{BTree,Hash}Map::values_mut`
4686 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
4691 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
4692 The semantics of this minor method are subtle and probably not what
4694 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
4695 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
4696 will fall back to `/dev/urandom` temporarily to avoid blocking
4697 during early boot](https://github.com/rust-lang/rust/pull/33086).
4698 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
4699 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
4700 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
4701 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
4702 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
4703 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
4704 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
4708 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
4709 This controls the runtime behavior of the `panic!` macro
4710 and can be either "unwind" (the default), or "abort".
4711 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4712 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
4713 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
4714 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
4715 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
4716 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
4717 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
4718 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
4719 By default they are retried twice, which can be customized with the
4720 `net.retry` value in `.cargo/config`.
4721 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
4722 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
4723 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
4724 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
4725 Makes it possible to install multiple crates in parallel.
4726 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
4727 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
4728 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
4729 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
4730 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
4731 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
4736 * [rustc memory usage was reduced by refactoring the context used for
4737 type checking](https://github.com/rust-lang/rust/pull/33425).
4738 * [Speed up creation of `HashMap`s by caching the random keys used
4739 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
4740 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
4741 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
4742 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
4743 10x faster than the previous lookup tables.
4744 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
4749 * Many incremental improvements to documentation and rustdoc.
4750 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
4751 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
4752 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
4753 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
4754 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
4755 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
4756 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
4761 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
4762 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
4763 * [`std` no longer prints backtraces on platforms where the running
4764 module must be loaded with `env::current_exe`, which can't be relied
4765 on](https://github.com/rust-lang/rust/pull/33554).
4766 * This release includes std binaries for the i586-unknown-linux-gnu,
4767 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
4768 i586 target is for old x86 hardware without SSE2, and the armv7
4769 target is for Android running on modern ARM architectures.
4770 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
4771 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
4772 * [On Unix the runtime aborts by calling `libc::abort` instead of
4773 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
4774 * [Rust is now bootstrapped from the previous release of Rust,
4775 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
4780 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
4781 * [`target_env` for Linux ARM targets is just `gnu`, not
4782 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
4783 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
4784 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
4785 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
4786 Affects how macros are parsed.
4787 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
4788 * [Feature-gated attributes on macro-generated macro invocations are
4789 now rejected](https://github.com/rust-lang/rust/pull/32791).
4790 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
4791 This caused some minor changes to type inference.
4794 Version 1.9.0 (2016-05-26)
4795 ==========================
4800 * The `#[deprecated]` attribute when applied to an API will generate
4801 warnings when used. The warnings may be suppressed with
4802 `#[allow(deprecated)]`. [RFC 1270].
4803 * [`fn` item types are zero sized, and each `fn` names a unique
4804 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4805 `transmute` on a `fn` type will generate a warning for a few cycles,
4806 then will be converted to an error.
4807 * [Field and method resolution understand visibility, so private
4808 fields and methods cannot prevent the proper use of public fields
4809 and methods][1.9fv].
4810 * [The parser considers unicode codepoints in the
4811 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
4817 * [`std::panic::catch_unwind`][] (renamed from `recover`)
4818 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
4819 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
4820 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
4821 * [`str::is_char_boundary`]
4822 * [`<*const T>::as_ref`]
4823 * [`<*mut T>::as_ref`]
4824 * [`<*mut T>::as_mut`]
4825 * [`AsciiExt::make_ascii_uppercase`]
4826 * [`AsciiExt::make_ascii_lowercase`]
4827 * [`char::decode_utf16`]
4828 * [`char::DecodeUtf16`]
4829 * [`char::DecodeUtf16Error`]
4830 * [`char::DecodeUtf16Error::unpaired_surrogate`]
4831 * [`BTreeSet::take`]
4832 * [`BTreeSet::replace`]
4835 * [`HashSet::replace`]
4837 * [`OsString::with_capacity`]
4838 * [`OsString::clear`]
4839 * [`OsString::capacity`]
4840 * [`OsString::reserve`]
4841 * [`OsString::reserve_exact`]
4842 * [`OsStr::is_empty`]
4844 * [`std::os::unix::thread`]
4847 * [`JoinHandleExt::as_pthread_t`]
4848 * [`JoinHandleExt::into_pthread_t`]
4849 * [`HashSet::hasher`]
4850 * [`HashMap::hasher`]
4851 * [`CommandExt::exec`]
4852 * [`File::try_clone`]
4853 * [`SocketAddr::set_ip`]
4854 * [`SocketAddr::set_port`]
4855 * [`SocketAddrV4::set_ip`]
4856 * [`SocketAddrV4::set_port`]
4857 * [`SocketAddrV6::set_ip`]
4858 * [`SocketAddrV6::set_port`]
4859 * [`SocketAddrV6::set_flowinfo`]
4860 * [`SocketAddrV6::set_scope_id`]
4861 * [`slice::copy_from_slice`]
4862 * [`ptr::read_volatile`]
4863 * [`ptr::write_volatile`]
4864 * [`OpenOptions::create_new`]
4865 * [`TcpStream::set_nodelay`]
4866 * [`TcpStream::nodelay`]
4867 * [`TcpStream::set_ttl`]
4868 * [`TcpStream::ttl`]
4869 * [`TcpStream::set_only_v6`]
4870 * [`TcpStream::only_v6`]
4871 * [`TcpStream::take_error`]
4872 * [`TcpStream::set_nonblocking`]
4873 * [`TcpListener::set_ttl`]
4874 * [`TcpListener::ttl`]
4875 * [`TcpListener::set_only_v6`]
4876 * [`TcpListener::only_v6`]
4877 * [`TcpListener::take_error`]
4878 * [`TcpListener::set_nonblocking`]
4879 * [`UdpSocket::set_broadcast`]
4880 * [`UdpSocket::broadcast`]
4881 * [`UdpSocket::set_multicast_loop_v4`]
4882 * [`UdpSocket::multicast_loop_v4`]
4883 * [`UdpSocket::set_multicast_ttl_v4`]
4884 * [`UdpSocket::multicast_ttl_v4`]
4885 * [`UdpSocket::set_multicast_loop_v6`]
4886 * [`UdpSocket::multicast_loop_v6`]
4887 * [`UdpSocket::set_multicast_ttl_v6`]
4888 * [`UdpSocket::multicast_ttl_v6`]
4889 * [`UdpSocket::set_ttl`]
4890 * [`UdpSocket::ttl`]
4891 * [`UdpSocket::set_only_v6`]
4892 * [`UdpSocket::only_v6`]
4893 * [`UdpSocket::join_multicast_v4`]
4894 * [`UdpSocket::join_multicast_v6`]
4895 * [`UdpSocket::leave_multicast_v4`]
4896 * [`UdpSocket::leave_multicast_v6`]
4897 * [`UdpSocket::take_error`]
4898 * [`UdpSocket::connect`]
4899 * [`UdpSocket::send`]
4900 * [`UdpSocket::recv`]
4901 * [`UdpSocket::set_nonblocking`]
4906 * [`std::sync::Once` is poisoned if its initialization function
4908 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4909 * [Most types implement `fmt::Debug`][1.9db].
4910 * [The default buffer size used by `BufReader` and `BufWriter` was
4911 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4912 used by other languages.
4913 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4914 `Duration` additionally implements `*=` and `/=`][1.9ta].
4915 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4916 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4917 * [`Chain` implements `BufRead`][1.9ch].
4918 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4923 * [Cargo can now run concurrently][1.9cc].
4924 * [Top-level overrides allow specific revisions of crates to be
4925 overridden through the entire crate graph][1.9ct]. This is intended
4926 to make upgrades easier for large projects, by allowing crates to be
4927 forked temporarily until they've been upgraded and republished.
4928 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4929 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4930 on the commandline][1.9cf]. `rustc` arguments can also be specified
4931 in the `build.rustflags` configuration key.
4936 * [The time complexity of comparing variables for equivalence during type
4937 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4938 to major compilation time improvement in some scenarios.
4939 * [`ToString` is specialized for `str`, giving it the same performance
4940 as `to_owned`][1.9ts].
4941 * [Spawning processes with `Command::output` no longer creates extra
4943 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4944 for C-like enums][1.9cl].
4949 * [Passing the `--quiet` flag to a test runner will produce
4950 much-abbreviated output][1.9q].
4951 * The Rust Project now publishes std binaries for the
4952 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4953 `i586-pc-windows-msvc` targets.
4958 * [`std::sync::Once` is poisoned if its initialization function
4960 * [It is illegal to define methods with the same name in overlapping
4961 inherent `impl` blocks][1.9sn].
4962 * [`fn` item types are zero sized, and each `fn` names a unique
4963 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4964 `transmute` on a `fn` type will generate a warning for a few cycles,
4965 then will be converted to an error.
4966 * [Improvements to const evaluation may trigger new errors when integer
4967 literals are out of range][1.9ce].
4970 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4971 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4972 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4973 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4974 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4975 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4976 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4977 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4978 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4979 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4980 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4981 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4982 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4983 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4984 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4985 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4986 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4987 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4988 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4989 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4990 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4991 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4992 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4993 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4994 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4995 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4996 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4997 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4998 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4999 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5000 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5001 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5002 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5003 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5004 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5005 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5006 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5007 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5008 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5009 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5010 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5011 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5012 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5013 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5014 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5015 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5016 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5017 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5018 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5019 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5020 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5021 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5022 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5023 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5024 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5025 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5026 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5027 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5028 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5029 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5030 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5031 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5032 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5033 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5034 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5035 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5036 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5037 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5038 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5039 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5040 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5041 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5042 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5043 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5044 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5045 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5046 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5047 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5048 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5049 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5050 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5051 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5052 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5053 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5054 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5055 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5056 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5057 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5058 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5059 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5060 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5061 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5062 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5063 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5064 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5065 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5066 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5067 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5068 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5069 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5070 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5071 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5072 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5073 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5074 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5075 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5076 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5077 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5078 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5079 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5082 Version 1.8.0 (2016-04-14)
5083 ==========================
5088 * Rust supports overloading of compound assignment statements like
5089 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5090 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5091 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5093 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5094 addition to the non-braced form, `struct Foo;`. [RFC 218].
5100 * [`str::encode_utf16`][] (renamed from `utf16_units`)
5101 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
5104 * [`ptr::drop_in_place`]
5106 * [`time::SystemTime`]
5108 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
5109 * [`Instant::elapsed`]
5110 * [`SystemTime::now`]
5111 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
5112 * [`SystemTime::elapsed`]
5113 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5114 * [`SystemTimeError`]
5115 * [`SystemTimeError::duration`]
5116 * Various impls for `SystemTimeError`
5118 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5119 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5120 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5121 * [The `write!` and `writeln!` macros correctly emit errors if any of
5122 their arguments can't be formatted][1.8w].
5123 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5124 * [The Unix-specific `raw` modules, which contain a number of
5125 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5126 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5127 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5128 across platforms was making it difficult to implement `std`
5129 correctly. Those that need these definitions should use the `libc`
5131 * The Unix-specific `MetadataExt` traits, including
5132 `os::unix::fs::MetadataExt`, which expose values such as inode
5133 numbers [no longer return platform-specific types][1.8r], but
5134 instead return widened integers. [RFC 1415].
5135 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
5136 * [Atomic loads and stores are not volatile][1.8a].
5137 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
5142 * [Inlining hash functions lead to a 3% compile-time improvement in
5143 some workloads][1.8h].
5144 * When using jemalloc, its symbols are [unprefixed so that it
5145 overrides the libc malloc implementation][1.8h]. This means that for
5146 rustc, LLVM is now using jemalloc, which results in a 6%
5147 compile-time improvement on a specific workload.
5148 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
5153 * [32-bit MSVC builds finally implement unwinding][1.8ms].
5154 i686-pc-windows-msvc is now considered a tier-1 platform.
5155 * [The `--print targets` flag prints a list of supported targets][1.8t].
5156 * [The `--print cfg` flag prints the `cfg`s defined for the current
5158 * [`rustc` can be built with an new Cargo-based build system, written
5159 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
5160 build system. To enable it configure with `configure --rustbuild`.
5161 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
5162 variants while also indicating the total number of missing variants
5163 if more than 3][1.8m].
5164 * [Executable stacks are disabled on Linux and BSD][1.8nx].
5165 * The Rust Project now publishes binary releases of the standard
5166 library for a number of tier-2 targets:
5167 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
5168 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
5169 `x86_64-rumprun-netbsd`. These can be installed with
5170 tools such as [multirust][1.8mr].
5175 * [`cargo init` creates a new Cargo project in the current
5176 directory][1.8ci]. It is otherwise like `cargo new`.
5177 * [Cargo has configuration keys for `-v` and
5178 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
5179 `[term]` section of `.cargo/config`.
5180 * [Configuration keys that evaluate to strings or integers can be set
5181 via environment variables][1.8ce]. For example the `build.jobs` key
5182 can be set via `CARGO_BUILD_JOBS`. Environment variables take
5183 precedence over config files.
5184 * [Target-specific dependencies support Rust `cfg` syntax for
5185 describing targets][1.8cfg] so that dependencies for multiple
5186 targets can be specified together. [RFC 1361].
5187 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
5188 `RUSTDOC` take precedence over the `build.target-dir`,
5189 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
5190 * [The child process tree is killed on Windows when Cargo is
5192 * [The `build.target` configuration value sets the target platform,
5193 like `--target`][1.8ct].
5198 * [Unstable compiler flags have been further restricted][1.8u]. Since
5199 1.0 `-Z` flags have been considered unstable, and other flags that
5200 were considered unstable additionally required passing `-Z
5201 unstable-options` to access. Unlike unstable language and library
5202 features though, these options have been accessible on the stable
5203 release channel. Going forward, *new unstable flags will not be
5204 available on the stable release channel*, and old unstable flags
5205 will warn about their usage. In the future, all unstable flags will
5206 be unavailable on the stable release channel.
5207 * [It is no longer possible to `match` on empty enum variants using
5208 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
5209 * The Unix-specific `MetadataExt` traits, including
5210 `os::unix::fs::MetadataExt`, which expose values such as inode
5211 numbers [no longer return platform-specific types][1.8r], but
5212 instead return widened integers. [RFC 1415].
5213 * [Modules sourced from the filesystem cannot appear within arbitrary
5214 blocks, but only within other modules][1.8mf].
5215 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
5216 * On Unix, [stack overflow triggers a runtime abort instead of a
5218 * [`Command::spawn` and its equivalents return an error if any of
5219 its command-line arguments contain interior `NUL`s][1.8n].
5220 * [Tuple and unit enum variants from other crates are in the type
5222 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
5223 type instead of `.a` files][1.8st]. Additionally, for the MSVC
5224 toolchain, `rustc` emits import libraries named `foo.dll.lib`
5225 instead of `foo.lib`.
5228 [1.8a]: https://github.com/rust-lang/rust/pull/30962
5229 [1.8b]: https://github.com/rust-lang/rust/pull/31123
5230 [1.8c]: https://github.com/rust-lang/rust/pull/31530
5231 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
5232 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
5233 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
5234 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
5235 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
5236 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
5237 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
5238 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
5239 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
5240 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
5241 [1.8h]: https://github.com/rust-lang/rust/pull/31460
5242 [1.8l]: https://github.com/rust-lang/rust/pull/31668
5243 [1.8m]: https://github.com/rust-lang/rust/pull/31020
5244 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
5245 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
5246 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
5247 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
5248 [1.8n]: https://github.com/rust-lang/rust/pull/31056
5249 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
5250 [1.8r]: https://github.com/rust-lang/rust/pull/31551
5251 [1.8so]: https://github.com/rust-lang/rust/pull/31333
5252 [1.8st]: https://github.com/rust-lang/rust/pull/29520
5253 [1.8t]: https://github.com/rust-lang/rust/pull/31358
5254 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
5255 [1.8u]: https://github.com/rust-lang/rust/pull/31793
5256 [1.8v]: https://github.com/rust-lang/rust/pull/31757
5257 [1.8w]: https://github.com/rust-lang/rust/pull/31904
5258 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
5259 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
5260 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
5261 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
5262 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
5263 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
5264 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
5265 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
5266 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
5267 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
5268 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
5269 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
5270 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
5271 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
5272 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
5273 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
5274 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
5275 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
5276 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
5277 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
5278 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
5279 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
5280 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
5281 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
5282 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
5283 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
5284 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
5285 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
5286 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
5287 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
5290 Version 1.7.0 (2016-03-03)
5291 ==========================
5298 * [`Path::strip_prefix`][] (renamed from relative_from)
5299 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
5301 * [`Ipv4Addr::is_loopback`]
5302 * [`Ipv4Addr::is_private`]
5303 * [`Ipv4Addr::is_link_local`]
5304 * [`Ipv4Addr::is_multicast`]
5305 * [`Ipv4Addr::is_broadcast`]
5306 * [`Ipv4Addr::is_documentation`]
5308 * [`Ipv6Addr::is_unspecified`]
5309 * [`Ipv6Addr::is_loopback`]
5310 * [`Ipv6Addr::is_multicast`]
5313 * [`Vec::as_mut_slice`]
5315 * [`String::as_str`]
5316 * [`String::as_mut_str`]
5318 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
5320 * `<[T]>::`[`sort_by_key`]
5321 * checked, saturated, and overflowing operations
5322 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
5323 * [`i32::saturating_mul`]
5324 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
5325 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
5326 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
5327 * [`u32::saturating_mul`]
5328 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
5329 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
5330 * and checked, saturated, and overflowing operations for other primitive types
5332 * [`ffi::IntoStringError`]
5333 * [`CString::into_string`]
5334 * [`CString::into_bytes`]
5335 * [`CString::into_bytes_with_nul`]
5336 * `From<CString> for Vec<u8>`
5338 * [`IntoStringError::into_cstring`]
5339 * [`IntoStringError::utf8_error`]
5340 * `Error for IntoStringError`
5342 * [`std::hash::BuildHasher`]
5343 * [`BuildHasher::Hasher`]
5344 * [`BuildHasher::build_hasher`]
5345 * [`std::hash::BuildHasherDefault`]
5346 * [`HashMap::with_hasher`]
5347 * [`HashMap::with_capacity_and_hasher`]
5348 * [`HashSet::with_hasher`]
5349 * [`HashSet::with_capacity_and_hasher`]
5350 * [`std::collections::hash_map::RandomState`]
5351 * [`RandomState::new`]
5352 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
5353 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
5354 from bytes is faster.
5355 * [The performance of `LineWriter` (and thus `io::stdout`) was
5356 improved by using `memchr` to search for newlines][1.7m].
5357 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
5358 `f64` variants were stabilized previously.
5359 * [`BTreeMap` was rewritten to use less memory and improve the performance
5360 of insertion and iteration, the latter by as much as 5x][1.7bm].
5361 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
5362 covariant over their contained type][1.7bt].
5363 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
5364 over their contained type][1.7ll].
5365 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
5367 * [`Any` is implemented for unsized types][1.7a].
5368 * [`Hash` is implemented for `Duration`][1.7h].
5373 * [When running tests with `--test`, rustdoc will pass `--cfg`
5374 arguments to the compiler][1.7dt].
5375 * [The compiler is built with RPATH information by default][1.7rpa].
5376 This means that it will be possible to run `rustc` when installed in
5377 unusual configurations without configuring the dynamic linker search
5379 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
5380 any RPATH entries (emitted with `-C rpath`) *not* take precedence
5381 over `LD_LIBRARY_PATH`.
5386 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
5387 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
5388 * [The `rerun-if-changed` build script directive no longer causes the
5389 build script to incorrectly run twice in certain scenarios][1.7rr].
5394 * Soundness fixes to the interactions between associated types and
5395 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
5396 code that violates the new rules. This is a significant change that
5397 is known to break existing code, so it has emitted warnings for the
5398 new error cases since 1.4 to give crate authors time to adapt. The
5399 details of what is changing are subtle; read the RFC for more.
5400 * [Several bugs in the compiler's visibility calculations were
5401 fixed][1.7v]. Since this was found to break significant amounts of
5402 code, the new errors will be emitted as warnings for several release
5403 cycles, under the `private_in_public` lint.
5404 * Defaulted type parameters were accidentally accepted in positions
5405 that were not intended. In this release, [defaulted type parameters
5406 appearing outside of type definitions will generate a
5407 warning][1.7d], which will become an error in future releases.
5408 * [Parsing "." as a float results in an error instead of 0][1.7p].
5409 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
5410 * [Borrows of closure parameters may not outlive the closure][1.7bc].
5412 [1.7a]: https://github.com/rust-lang/rust/pull/30928
5413 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
5414 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
5415 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
5416 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
5417 [1.7d]: https://github.com/rust-lang/rust/pull/30724
5418 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
5419 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
5420 [1.7f]: https://github.com/rust-lang/rust/pull/30672
5421 [1.7h]: https://github.com/rust-lang/rust/pull/30818
5422 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
5423 [1.7m]: https://github.com/rust-lang/rust/pull/30381
5424 [1.7p]: https://github.com/rust-lang/rust/pull/30681
5425 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
5426 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
5427 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
5428 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
5429 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
5430 [1.7v]: https://github.com/rust-lang/rust/pull/29973
5431 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5432 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5433 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
5434 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
5435 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
5436 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
5437 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
5438 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
5439 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
5440 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
5441 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
5442 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
5443 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
5444 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
5445 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
5446 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
5447 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
5448 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
5449 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
5450 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
5451 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
5452 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
5453 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
5454 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
5455 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
5456 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
5457 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
5458 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
5459 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
5460 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
5461 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
5462 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
5463 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
5464 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
5465 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
5466 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
5467 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
5468 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
5469 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
5470 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
5471 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
5472 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
5473 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
5474 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
5475 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
5476 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
5477 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
5478 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5479 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
5480 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5481 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
5482 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
5483 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
5484 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
5485 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
5486 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
5487 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
5488 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
5489 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
5490 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
5493 Version 1.6.0 (2016-01-21)
5494 ==========================
5499 * The `#![no_std]` attribute causes a crate to not be linked to the
5500 standard library, but only the [core library][1.6co], as described
5501 in [RFC 1184]. The core library defines common types and traits but
5502 has no platform dependencies whatsoever, and is the basis for Rust
5503 software in environments that cannot support a full port of the
5504 standard library, such as operating systems. Most of the core
5505 library is now stable.
5511 [`Read::read_exact`],
5512 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
5513 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
5514 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
5515 [`os::unix::fs::DirBuilderExt`],
5516 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
5517 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
5518 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
5519 [`collections::hash_map::Drain`],
5520 [`collections::hash_map::HashMap::drain`],
5521 [`collections::hash_set::Drain`],
5522 [`collections::hash_set::HashSet::drain`],
5523 [`collections::binary_heap::Drain`],
5524 [`collections::binary_heap::BinaryHeap::drain`],
5525 [`Vec::extend_from_slice`][] (renamed from `push_all`),
5526 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
5527 [`RwLock::into_inner`],
5528 [`Iterator::min_by_key`][] (renamed from `min_by`),
5529 [`Iterator::max_by_key`][] (renamed from `max_by`).
5530 * The [core library][1.6co] is stable, as are most of its APIs.
5531 * [The `assert_eq!` macro supports arguments that don't implement
5532 `Sized`][1.6ae], such as arrays. In this way it behaves more like
5534 * Several timer functions that take duration in milliseconds [are
5535 deprecated in favor of those that take `Duration`][1.6ms]. These
5536 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
5537 `thread::park_timeout_ms`.
5538 * The algorithm by which `Vec` reserves additional elements was
5539 [tweaked to not allocate excessive space][1.6a] while still growing
5541 * `From` conversions are [implemented from integers to floats][1.6f]
5542 in cases where the conversion is lossless. Thus they are not
5543 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
5544 or `f64`. They are also not implemented for `isize` and `usize`
5545 because the implementations would be platform-specific. `From` is
5546 also implemented from `f32` to `f64`.
5547 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
5548 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
5549 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
5550 * [`BinaryHeap` was refactored][1.6bh] for modest performance
5552 * Sorting slices that are already sorted [is 50% faster in some
5558 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
5559 * Cargo build scripts can specify their dependencies by emitting the
5560 [`rerun-if-changed`][1.6rr] key.
5561 * crates.io will reject publication of crates with dependencies that
5562 have a wildcard version constraint. Crates with wildcard
5563 dependencies were seen to cause a variety of problems, as described
5564 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
5566 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
5567 release folder. A variety of artifacts that Cargo failed to clean
5568 are now correctly deleted.
5573 * The `unreachable_code` lint [warns when a function call's argument
5575 * The parser indicates [failures that may be caused by
5576 confusingly-similar Unicode characters][1.6uc]
5577 * Certain macro errors [are reported at definition time][1.6m], not
5583 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
5584 environment variable when locating crates. This was a pre-cargo
5585 feature for integrating with the package manager that was
5586 accidentally never removed.
5587 * [A number of bugs were fixed in the privacy checker][1.6p] that
5588 could cause previously-accepted code to break.
5589 * [Modules and unit/tuple structs may not share the same name][1.6ts].
5590 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
5591 struct pattern syntax (`Foo(..)`) can no longer be used to match
5592 unit structs. This is a warning now, but will become an error in
5593 future releases. Patterns that share the same name as a const are
5595 * A bug was fixed that causes [rustc not to apply default type
5596 parameters][1.6xc] when resolving certain method implementations of
5597 traits defined in other crates.
5599 [1.6a]: https://github.com/rust-lang/rust/pull/29454
5600 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
5601 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
5602 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
5603 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
5604 [1.6co]: http://doc.rust-lang.org/core/index.html
5605 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
5606 [1.6f]: https://github.com/rust-lang/rust/pull/29129
5607 [1.6m]: https://github.com/rust-lang/rust/pull/29828
5608 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
5609 [1.6p]: https://github.com/rust-lang/rust/pull/29726
5610 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
5611 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
5612 [1.6s]: https://github.com/rust-lang/rust/pull/29675
5613 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
5614 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
5615 [1.6us]: https://github.com/rust-lang/rust/pull/29383
5616 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
5617 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
5618 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5619 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
5620 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
5621 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
5622 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
5623 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
5624 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
5625 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
5626 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
5627 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
5628 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
5629 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
5630 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
5631 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
5632 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
5633 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
5634 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
5635 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
5636 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
5637 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
5638 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
5639 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
5640 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
5641 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
5642 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
5643 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
5644 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
5645 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
5648 Version 1.5.0 (2015-12-10)
5649 ==========================
5651 * ~700 changes, numerous bugfixes
5657 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
5658 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
5659 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
5660 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
5661 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
5662 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
5663 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
5664 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
5665 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
5666 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
5667 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
5668 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
5669 [`Path::read_link`], [`Path::symlink_metadata`],
5670 [`Utf8Error::valid_up_to`], [`Vec::resize`],
5671 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
5672 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
5673 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
5674 [`slice::split_first_mut`], [`slice::split_first`],
5675 [`slice::split_last_mut`], [`slice::split_last`],
5676 [`char::from_u32_unchecked`], [`fs::canonicalize`],
5677 [`str::MatchIndices`], [`str::RMatchIndices`],
5678 [`str::match_indices`], [`str::rmatch_indices`],
5679 [`str::slice_mut_unchecked`], [`string::ParseError`].
5680 * Rust applications hosted on crates.io can be installed locally to
5681 `~/.cargo/bin` with the [`cargo install`] command. Among other
5682 things this makes it easier to augment Cargo with new subcommands:
5683 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
5684 invoked as `cargo foo`.
5685 * Crates with wildcard (`*`) dependencies will [emit warnings when
5686 published][1.5w]. In 1.6 it will no longer be possible to publish
5687 crates with wildcard dependencies.
5692 * The rules determining when a particular lifetime must outlive
5693 a particular value (known as '[dropck]') have been [modified
5694 to not rely on parametricity][1.5p].
5695 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
5696 and `Arc`][1.5a]. Because these smart pointer types implement
5697 `Deref`, this causes breakage in cases where the interior type
5698 contains methods of the same name.
5699 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
5700 that they could drop their content. Soundness fix.
5701 * All method invocations are [properly checked][1.5wf1] for
5702 [well-formedness][1.5wf2]. Soundness fix.
5703 * Traits whose supertraits contain `Self` are [not object
5704 safe][1.5o]. Soundness fix.
5705 * Target specifications support a [`no_default_libraries`][1.5nd]
5706 setting that controls whether `-nodefaultlibs` is passed to the
5707 linker, and in turn the `is_like_windows` setting no longer affects
5708 the `-nodefaultlibs` flag.
5709 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
5710 * The `#[inline]` and `#[repr]` attributes [can only appear
5711 in valid locations][1.5at].
5712 * Native libraries linked from the local crate are [passed to
5713 the linker before native libraries from upstream crates][1.5nl].
5714 * Two rarely-used attributes, `#[no_debug]` and
5715 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
5716 * Negation of unsigned integers, which has been a warning for
5717 several releases, [is now behind a feature gate and will
5718 generate errors][1.5nu].
5719 * The parser accidentally accepted visibility modifiers on
5720 enum variants, a bug [which has been fixed][1.5ev].
5721 * [A bug was fixed that allowed `use` statements to import unstable
5727 * When evaluating expressions at compile-time that are not
5728 compile-time constants (const-evaluating expressions in non-const
5729 contexts), incorrect code such as overlong bitshifts and arithmetic
5730 overflow will [generate a warning instead of an error][1.5ce],
5731 delaying the error until runtime. This will allow the
5732 const-evaluator to be expanded in the future backwards-compatibly.
5733 * The `improper_ctypes` lint [no longer warns about using `isize` and
5734 `usize` in FFI][1.5ict].
5739 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
5741 * `Default` is [implemented for mutable slices][1.5d].
5742 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
5743 * There are now `From` conversions [between floating point
5744 types][1.5f] where the conversions are lossless.
5745 * There are now `From` conversions [between integer types][1.5i] where
5746 the conversions are lossless.
5747 * [`fs::Metadata` implements `Clone`][1.5fs].
5748 * The `parse` method [accepts a leading "+" when parsing
5750 * [`AsMut` is implemented for `Vec`][1.5am].
5751 * The `clone_from` implementations for `String` and `BinaryHeap` [have
5752 been optimized][1.5cf] and no longer rely on the default impl.
5753 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
5754 `unsafe extern "C"` function types now [implement `Clone`,
5755 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
5756 `fmt::Debug` for up to 12 arguments][1.5fp].
5757 * [Dropping `Vec`s is much faster in unoptimized builds when the
5758 element types don't implement `Drop`][1.5dv].
5759 * A bug that caused in incorrect behavior when [combining `VecDeque`
5760 with zero-sized types][1.5vdz] was resolved.
5761 * [`PartialOrd` for slices is faster][1.5po].
5766 * [Crate metadata size was reduced by 20%][1.5md].
5767 * [Improvements to code generation reduced the size of libcore by 3.3
5768 MB and rustc's memory usage by 18MB][1.5m].
5769 * [Improvements to deref translation increased performance in
5770 unoptimized builds][1.5dr].
5771 * Various errors in trait resolution [are deduplicated to only be
5772 reported once][1.5te].
5773 * Rust has preliminary [support for rumprun kernels][1.5rr].
5774 * Rust has preliminary [support for NetBSD on amd64][1.5na].
5776 [1.5use]: https://github.com/rust-lang/rust/pull/28364
5777 [1.5po]: https://github.com/rust-lang/rust/pull/28436
5778 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
5779 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
5780 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
5781 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
5782 [1.5md]: https://github.com/rust-lang/rust/pull/28521
5783 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
5784 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
5785 [1.5na]: https://github.com/rust-lang/rust/pull/28543
5786 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
5787 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
5788 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
5789 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
5790 [1.5te]: https://github.com/rust-lang/rust/pull/28645
5791 [1.5at]: https://github.com/rust-lang/rust/pull/28650
5792 [1.5am]: https://github.com/rust-lang/rust/pull/28663
5793 [1.5m]: https://github.com/rust-lang/rust/pull/28778
5794 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
5795 [1.5a]: https://github.com/rust-lang/rust/pull/28811
5796 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
5797 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
5798 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
5799 [1.5i]: https://github.com/rust-lang/rust/pull/28921
5800 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
5801 [1.5f]: https://github.com/rust-lang/rust/pull/29129
5802 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
5803 [1.5s]: https://github.com/rust-lang/rust/pull/29190
5804 [1.5d]: https://github.com/rust-lang/rust/pull/29245
5805 [1.5o]: https://github.com/rust-lang/rust/pull/29259
5806 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
5807 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5808 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
5809 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
5810 [1.5c]: https://github.com/rust-lang/rust/pull/29110
5811 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5812 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
5813 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
5814 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
5815 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
5816 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
5817 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
5818 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
5819 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
5820 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
5821 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
5822 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
5823 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
5824 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
5825 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
5826 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
5827 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
5828 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
5829 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
5830 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
5831 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
5832 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
5833 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
5834 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
5835 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
5836 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
5837 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
5838 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
5839 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
5840 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
5841 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
5842 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
5843 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
5844 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
5845 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
5846 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
5847 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
5848 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
5849 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
5850 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
5851 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
5852 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
5853 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
5854 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
5855 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
5856 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
5857 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
5858 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
5859 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
5860 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
5861 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
5862 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
5863 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
5864 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
5866 Version 1.4.0 (2015-10-29)
5867 ==========================
5869 * ~1200 changes, numerous bugfixes
5874 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
5875 GNU) are now supported and recommended for use.
5880 * [Several changes have been made to fix type soundness and improve
5881 the behavior of associated types][sound]. See [RFC 1214]. Although
5882 we have mostly introduced these changes as warnings this release, to
5883 become errors next release, there are still some scenarios that will
5884 see immediate breakage.
5885 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
5886 line breaks in addition to `\n`][crlf].
5887 * [Loans of `'static` lifetime extend to the end of a function][stat].
5888 * [`str::parse` no longer introduces avoidable rounding error when
5889 parsing floating point numbers. Together with earlier changes to
5890 float formatting/output, "round trips" like f.to_string().parse()
5891 now preserve the value of f exactly. Additionally, leading plus
5892 signs are now accepted][fp3].
5898 * `use` statements that import multiple items [can now rename
5899 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
5900 * [Binops work correctly on fat pointers][binfat].
5901 * `pub extern crate`, which does not behave as expected, [issues a
5902 warning][pec] until a better solution is found.
5907 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5908 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5909 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5910 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5911 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5912 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5913 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5914 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5915 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5916 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5917 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5918 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5919 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5920 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5921 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5922 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5923 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5924 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5926 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5927 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5928 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5929 `f64::from_str_radix`.
5930 * [Reverse-searching strings is faster with the 'two-way'
5932 * [`std::io::copy` allows `?Sized` arguments][cc].
5933 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5934 [override `count`, `nth` and `last` with an O(1)
5935 implementation][it].
5936 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5937 * [`IntoRawFd` has been added to the Unix-specific prelude,
5938 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5940 * [`Extend<String>` and `FromIterator<String` are both implemented for
5942 * [`IntoIterator` is implemented for references to `Option` and
5944 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5945 Copy`][ext] as part of [RFC 839]. This will cause type inference
5946 breakage in rare situations.
5947 * [`BinaryHeap` implements `Debug`][bh2].
5948 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5950 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5951 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5952 * [String comparison is faster][faststr].
5953 * `&mut T` where `T: std::fmt::Write` [also implements
5954 `std::fmt::Write`][mutw].
5955 * [A stable regression in `VecDeque::push_back` and other
5956 capacity-altering methods that caused panics for zero-sized types
5958 * [Function pointers implement traits for up to 12 parameters][fp2].
5963 * The compiler [no longer uses the 'morestack' feature to prevent
5964 stack overflow][mm]. Instead it uses guard pages and stack
5965 probes (though stack probes are not yet implemented on any platform
5967 * [The compiler matches traits faster when projections are involved][p].
5968 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5970 * [Cargo now displays useful information about what its doing during
5971 `cargo update`][cu].
5973 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5974 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5975 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5976 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5977 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5978 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5979 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5980 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5981 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5982 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5983 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5984 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5985 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5986 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5987 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5988 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5989 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5990 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5991 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5992 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5993 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5994 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5995 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5996 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5997 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5998 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5999 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6000 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6001 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6002 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6003 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6004 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6005 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6006 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6007 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6008 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6009 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6010 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6011 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6012 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6013 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6014 [bh2]: https://github.com/rust-lang/rust/pull/28156
6015 [binfat]: https://github.com/rust-lang/rust/pull/28270
6016 [bm]: https://github.com/rust-lang/rust/pull/28197
6017 [cc]: https://github.com/rust-lang/rust/pull/27531
6018 [crlf]: https://github.com/rust-lang/rust/pull/28034
6019 [cu]: https://github.com/rust-lang/cargo/pull/1931
6020 [d]: https://github.com/rust-lang/rust/pull/27825
6021 [dep]: https://github.com/rust-lang/rust/pull/28339
6022 [es]: https://github.com/rust-lang/rust/pull/27956
6023 [ext]: https://github.com/rust-lang/rust/pull/28094
6024 [faststr]: https://github.com/rust-lang/rust/pull/28338
6025 [ffi]: https://github.com/rust-lang/rust/pull/28779
6026 [fp]: https://github.com/rust-lang/rust/pull/28268
6027 [fp2]: https://github.com/rust-lang/rust/pull/28560
6028 [fp3]: https://github.com/rust-lang/rust/pull/27307
6029 [i]: https://github.com/rust-lang/rust/pull/27451
6030 [into2]: https://github.com/rust-lang/rust/pull/28039
6031 [it]: https://github.com/rust-lang/rust/pull/27652
6032 [mm]: https://github.com/rust-lang/rust/pull/27338
6033 [mutw]: https://github.com/rust-lang/rust/pull/28368
6034 [sound]: https://github.com/rust-lang/rust/pull/27641
6035 [p]: https://github.com/rust-lang/rust/pull/27866
6036 [pec]: https://github.com/rust-lang/rust/pull/28486
6037 [pr]: https://github.com/rust-lang/rust/pull/27896
6038 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6039 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6040 [s]: https://github.com/rust-lang/rust/pull/27474
6041 [stab]: https://github.com/rust-lang/rust/pull/28339
6042 [stat]: https://github.com/rust-lang/rust/pull/28321
6043 [vd]: https://github.com/rust-lang/rust/pull/28494
6045 Version 1.3.0 (2015-09-17)
6046 ==============================
6048 * ~900 changes, numerous bugfixes
6053 * The [new object lifetime defaults][nold] have been [turned
6054 on][nold2] after a cycle of warnings about the change. Now types
6055 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6056 being interpreted as `&'a Box<Trait+'a>` to `&'a
6057 Box<Trait+'static>`.
6058 * [The Rustonomicon][nom] is a new book in the official documentation
6059 that dives into writing unsafe Rust.
6060 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6061 timekeeping is employed by other std APIs, as well as out-of-tree
6067 * The [new object lifetime defaults][nold] have been [turned
6068 on][nold2] after a cycle of warnings about the change.
6069 * There is a known [regression][lr] in how object lifetime elision is
6070 interpreted, the proper solution for which is undetermined.
6071 * The `#[prelude_import]` attribute, an internal implementation
6072 detail, was accidentally stabilized previously. [It has been put
6073 behind the `prelude_import` feature gate][pi]. This change is
6074 believed to break no existing code.
6075 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6076 [more sane for dynamically sized types][dst3]. Code that relied on
6077 the previous behavior is thought to be broken.
6078 * The `dropck` rules, which checks that destructors can't access
6079 destroyed values, [have been updated][dropck] to match the
6080 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6081 cause some previously-compiling code to no longer build.
6086 * The [new object lifetime defaults][nold] have been [turned
6087 on][nold2] after a cycle of warnings about the change.
6088 * Semicolons may [now follow types and paths in
6089 macros](https://github.com/rust-lang/rust/pull/27000).
6090 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6091 [more sane for dynamically sized types][dst3]. Code that relied on
6092 the previous behavior is not known to exist, and suspected to be
6094 * `'static` variables [may now be recursive][st].
6095 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6096 implementations correctly.
6097 * The `dropck` rules, which checks that destructors can't access
6098 destroyed values, [have been updated][dropck] to match the
6104 * The [`Duration`] API, [has been stabilized][ds], as well as the
6105 `std::time` module, which presently contains only `Duration`.
6106 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6107 * The owned C string, [`CString`], implements [`Borrow`] and the
6108 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6109 these allow C strings to be borrowed and cloned in generic code.
6110 * [`CStr`] implements [`Debug`].
6111 * [`AtomicPtr`] implements [`Debug`].
6112 * [`Error`] trait objects [can be downcast to their concrete types][e]
6113 in many common configurations, using the [`is`], [`downcast`],
6114 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6116 * Searching for substrings now [employs the two-way algorithm][search]
6117 instead of doing a naive search. This gives major speedups to a
6118 number of methods, including [`contains`][sc], [`find`][sf],
6119 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6120 [`ends_with`][sew] are also faster.
6121 * The performance of `PartialEq` for slices is [much faster][ps].
6122 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6123 is overridden and optimized by the implementations for scalars.
6124 * The [`Hasher`] trait now has a number of specialized `write_*`
6125 methods for primitive types, for efficiency.
6126 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6127 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6128 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6129 of [`std::error::Error::cause`][iec] also delegates to the inner
6131 * [`process::Child`][pc] gained the [`id`] method, which returns a
6132 `u32` representing the platform-specific process identifier.
6133 * The [`connect`] method on slices is deprecated, replaced by the new
6134 [`join`] method (note that both of these are on the *unstable*
6135 [`SliceConcatExt`] trait, but through the magic of the prelude are
6136 available to stable code anyway).
6137 * The [`Div`] operator is implemented for [`Wrapping`] types.
6138 * [`DerefMut` is implemented for `String`][dms].
6139 * Performance of SipHash (the default hasher for `HashMap`) is
6140 [better for long data][sh].
6141 * [`AtomicPtr`] implements [`Send`].
6142 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
6143 are now [specialized to use uninitialized buffers for increased
6145 * Lifetime parameters of foreign functions [are now resolved
6151 * Rust can now, with some coercion, [produce programs that run on
6152 Windows XP][xp], though XP is not considered a supported platform.
6153 * Porting Rust on Windows from the GNU toolchain to MSVC continues
6154 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
6155 recommended for use in 1.3, though should be fully-functional
6156 in the [64-bit 1.4 beta][b14].
6157 * On Fedora-based systems installation will [properly configure the
6158 dynamic linker][fl].
6159 * The compiler gained many new extended error descriptions, which can
6160 be accessed with the `--explain` flag.
6161 * The `dropck` pass, which checks that destructors can't access
6162 destroyed values, [has been rewritten][dropck]. This fixes some
6163 soundness holes, and as such will cause some previously-compiling
6164 code to no longer build.
6165 * `rustc` now uses [LLVM to write archive files where possible][ar].
6166 Eventually this will eliminate the compiler's dependency on the ar
6168 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
6169 supported FreeBSD on x86_64).
6170 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
6171 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
6173 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
6174 will kill the process instead of leaking][nlp].
6176 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
6177 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
6178 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
6179 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
6180 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
6181 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6182 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6183 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
6184 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
6185 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
6186 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
6187 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
6188 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
6189 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6190 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
6191 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
6192 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
6193 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
6194 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6195 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
6196 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
6197 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
6198 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
6199 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6200 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
6201 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
6202 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
6203 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
6204 [ar]: https://github.com/rust-lang/rust/pull/26926
6205 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
6206 [dms]: https://github.com/rust-lang/rust/pull/26241
6207 [dropck]: https://github.com/rust-lang/rust/pull/27261
6208 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6209 [ds]: https://github.com/rust-lang/rust/pull/26818
6210 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
6211 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
6212 [dst3]: https://github.com/rust-lang/rust/pull/27351
6213 [e]: https://github.com/rust-lang/rust/pull/24793
6214 [f]: https://github.com/rust-lang/rust/pull/26588
6215 [fb]: https://github.com/rust-lang/rust/pull/26959
6216 [fl]: https://github.com/rust-lang/rust-installer/pull/41
6217 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6218 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
6219 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
6220 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
6221 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
6222 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
6223 [lic]: https://github.com/rust-lang/rust/pull/26583
6224 [lnu]: https://github.com/rust-lang/rust/pull/27026
6225 [lr]: https://github.com/rust-lang/rust/issues/27248
6226 [lum]: https://github.com/rust-lang/rust/pull/26378
6227 [lur]: https://github.com/rust-lang/rust/pull/26783
6228 [nlp]: https://github.com/rust-lang/rust/pull/27176
6229 [nold2]: https://github.com/rust-lang/rust/pull/27045
6230 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
6231 [nom]: http://doc.rust-lang.org/nightly/nomicon/
6232 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
6233 [pi]: https://github.com/rust-lang/rust/pull/26699
6234 [ps]: https://github.com/rust-lang/rust/pull/26884
6235 [rte]: https://github.com/rust-lang/rust/pull/26950
6236 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
6237 [search]: https://github.com/rust-lang/rust/pull/26327
6238 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
6239 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
6240 [sh]: https://github.com/rust-lang/rust/pull/27280
6241 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
6242 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
6243 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
6244 [st]: https://github.com/rust-lang/rust/pull/26630
6245 [win1]: https://github.com/rust-lang/rust/pull/26569
6246 [win2]: https://github.com/rust-lang/rust/pull/26741
6247 [win3]: https://github.com/rust-lang/rust/pull/26741
6248 [win4]: https://github.com/rust-lang/rust/pull/27210
6249 [xp]: https://github.com/rust-lang/rust/pull/26569
6251 Version 1.2.0 (2015-08-07)
6252 ==========================
6254 * ~1200 changes, numerous bugfixes
6259 * [Dynamically-sized-type coercions][dst] allow smart pointer types
6260 like `Rc` to contain types without a fixed size, arrays and trait
6261 objects, finally enabling use of `Rc<[T]>` and completing the
6262 implementation of DST.
6263 * [Parallel codegen][parcodegen] is now working again, which can
6264 substantially speed up large builds in debug mode; It also gets
6265 another ~33% speedup when bootstrapping on a 4 core machine (using 8
6266 jobs). It's not enabled by default, but will be "in the near
6267 future". It can be activated with the `-C codegen-units=N` flag to
6269 * This is the first release with [experimental support for linking
6270 with the MSVC linker and lib C on Windows (instead of using the GNU
6271 variants via MinGW)][win]. It is yet recommended only for the most
6272 intrepid Rustaceans.
6273 * Benchmark compilations are showing a 30% improvement in
6274 bootstrapping over 1.1.
6279 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
6280 unicode case mapping, which is a previously-planned change in
6281 behavior and considered a bugfix.
6282 * [`mem::align_of`] now specifies [the *minimum alignment* for
6283 T][align], which is usually the alignment programs are interested
6284 in, and the same value reported by clang's
6285 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
6287 * [The `#[packed]` attribute is no longer silently accepted by the
6288 compiler][packed]. This attribute did nothing and code that
6289 mentioned it likely did not work as intended.
6290 * Associated type defaults are [now behind the
6291 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
6292 defaults *did not work*, but could be mentioned syntactically. As
6293 such this breakage has minimal impact.
6298 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
6299 matching against dereferenceable values.
6304 * The [`Extend`] trait, which grows a collection from an iterator, is
6305 implemented over iterators of references, for `String`, `Vec`,
6306 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
6307 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
6308 * The [`iter::once`] function returns an iterator that yields a single
6309 element, and [`iter::empty`] returns an iterator that yields no
6311 * The [`matches`] and [`rmatches`] methods on `str` return iterators
6312 over substring matches.
6313 * [`Cell`] and [`RefCell`] both implement `Eq`.
6314 * A number of methods for wrapping arithmetic are added to the
6315 integral types, [`wrapping_div`], [`wrapping_rem`],
6316 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
6317 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
6318 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
6319 type.. It is illegal for the default arithmetic operations in Rust
6320 to overflow; the desire to wrap must be explicit.
6321 * The `{:#?}` formatting specifier [displays the alternate,
6322 pretty-printed][debugfmt] form of the `Debug` formatter. This
6323 feature was actually introduced prior to 1.0 with little
6325 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
6326 for writing data to formatted strings, similar to [`io::Write`].
6327 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
6328 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
6329 are used by code generators to emit implementations of [`Debug`].
6330 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
6331 methods that convert case, following Unicode case mapping.
6332 * It is now easier to handle poisoned locks. The [`PoisonError`]
6333 type, returned by failing lock operations, exposes `into_inner`,
6334 `get_ref`, and `get_mut`, which all give access to the inner lock
6335 guard, and allow the poisoned lock to continue to operate. The
6336 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
6337 poisoned lock without attempting to take the lock.
6338 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
6339 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
6340 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
6341 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
6343 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
6349 * `rustc` employs smarter heuristics for guessing at [typos].
6350 * `rustc` emits more efficient code for [no-op conversions between
6351 unsafe pointers][nop].
6352 * Fat pointers are now [passed in pairs of immediate arguments][fat],
6353 resulting in faster compile times and smaller code.
6355 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
6356 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6357 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
6358 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
6359 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
6360 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
6361 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
6362 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
6363 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
6364 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
6365 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
6366 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
6367 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
6368 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
6369 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
6370 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
6371 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6372 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
6373 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
6374 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
6375 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
6376 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
6377 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
6378 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
6379 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
6380 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6381 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
6382 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
6383 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
6384 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
6385 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
6386 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
6387 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
6388 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6389 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6390 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
6391 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
6392 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
6393 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
6394 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
6395 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
6396 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6397 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
6398 [align]: https://github.com/rust-lang/rust/pull/25646
6399 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
6400 [typos]: https://github.com/rust-lang/rust/pull/26087
6401 [nop]: https://github.com/rust-lang/rust/pull/26336
6402 [fat]: https://github.com/rust-lang/rust/pull/26411
6403 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
6404 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
6405 [packed]: https://github.com/rust-lang/rust/pull/25541
6406 [ad]: https://github.com/rust-lang/rust/pull/27382
6407 [win]: https://github.com/rust-lang/rust/pull/25350
6409 Version 1.1.0 (2015-06-25)
6410 =========================
6412 * ~850 changes, numerous bugfixes
6417 * The [`std::fs` module has been expanded][fs] to expand the set of
6418 functionality exposed:
6419 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
6420 don't incur a syscall on some platforms.
6421 * A `symlink_metadata` function has been added.
6422 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
6423 access to all underlying information.
6424 * The compiler now contains extended explanations of many errors. When an error
6425 with an explanation occurs the compiler suggests using the `--explain` flag
6426 to read the explanation. Error explanations are also [available online][err-index].
6427 * Thanks to multiple [improvements][sk] to [type checking][pre], as
6428 well as other work, the time to bootstrap the compiler decreased by
6434 * The [`str::split_whitespace`] method splits a string on unicode
6435 whitespace boundaries.
6436 * On both Windows and Unix, new extension traits provide conversion of
6437 I/O types to and from the underlying system handles. On Unix, these
6438 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
6439 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
6440 `TcpListener`, and `UpdSocket`. Further implementations for
6441 `std::process` will be stabilized later.
6442 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
6443 Windows, symlinks can be created with
6444 `std::os::windows::symlink_dir` and
6445 `std::os::windows::symlink_file`.
6446 * The `mpsc::Receiver` type can now be converted into an iterator with
6447 `into_iter` on the [`IntoIterator`] trait.
6448 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
6449 implementation of the [`From`] trait.
6450 * The `Debug` implementation for `RangeFull` [creates output that is
6451 more consistent with other implementations][rf].
6452 * [`Debug` is implemented for `File`][file].
6453 * The `Default` implementation for `Arc` [no longer requires `Sync +
6455 * [The `Iterator` methods `count`, `nth`, and `last` have been
6456 overridden for slices to have O(1) performance instead of O(n)][si].
6457 * Incorrect handling of paths on Windows has been improved in both the
6458 compiler and the standard library.
6459 * [`AtomicPtr` gained a `Default` implementation][ap].
6460 * In accordance with Rust's policy on arithmetic overflow `abs` now
6461 [panics on overflow when debug assertions are enabled][abs].
6462 * The [`Cloned`] iterator, which was accidentally left unstable for
6463 1.0 [has been stabilized][c].
6464 * The [`Incoming`] iterator, which iterates over incoming TCP
6465 connections, and which was accidentally unnamable in 1.0, [is now
6466 properly exported][inc].
6467 * [`BinaryHeap`] no longer corrupts itself [when functions called by
6468 `sift_up` or `sift_down` panic][bh].
6469 * The [`split_off`] method of `LinkedList` [no longer corrupts
6470 the list in certain scenarios][ll].
6475 * Type checking performance [has improved notably][sk] with
6476 [multiple improvements][pre].
6477 * The compiler [suggests code changes][ch] for more errors.
6478 * rustc and it's build system have experimental support for [building
6479 toolchains against MUSL][m] instead of glibc on Linux.
6480 * The compiler defines the `target_env` cfg value, which is used for
6481 distinguishing toolchains that are otherwise for the same
6482 platform. Presently this is set to `gnu` for common GNU Linux
6483 targets and for MinGW targets, and `musl` for MUSL Linux targets.
6484 * The [`cargo rustc`][crc] command invokes a build with custom flags
6486 * [Android executables are always position independent][pie].
6487 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
6490 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
6491 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6492 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6493 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
6494 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
6495 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
6496 [rf]: https://github.com/rust-lang/rust/pull/24491
6497 [err-index]: https://doc.rust-lang.org/error-index.html
6498 [sk]: https://github.com/rust-lang/rust/pull/24615
6499 [pre]: https://github.com/rust-lang/rust/pull/25323
6500 [file]: https://github.com/rust-lang/rust/pull/24598
6501 [ch]: https://github.com/rust-lang/rust/pull/24683
6502 [arc]: https://github.com/rust-lang/rust/pull/24695
6503 [si]: https://github.com/rust-lang/rust/pull/24701
6504 [ap]: https://github.com/rust-lang/rust/pull/24834
6505 [m]: https://github.com/rust-lang/rust/pull/24777
6506 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
6507 [crc]: https://github.com/rust-lang/cargo/pull/1568
6508 [pie]: https://github.com/rust-lang/rust/pull/24953
6509 [abs]: https://github.com/rust-lang/rust/pull/25441
6510 [c]: https://github.com/rust-lang/rust/pull/25496
6511 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
6512 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
6513 [inc]: https://github.com/rust-lang/rust/pull/25522
6514 [bh]: https://github.com/rust-lang/rust/pull/25856
6515 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
6516 [ll]: https://github.com/rust-lang/rust/pull/26022
6517 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
6518 [drop]: https://github.com/rust-lang/rust/pull/24935
6520 Version 1.0.0 (2015-05-15)
6521 ========================
6523 * ~1500 changes, numerous bugfixes
6528 * The vast majority of the standard library is now `#[stable]`. It is
6529 no longer possible to use unstable features with a stable build of
6531 * Many popular crates on [crates.io] now work on the stable release
6533 * Arithmetic on basic integer types now [checks for overflow in debug
6539 * Several [restrictions have been added to trait coherence][coh] in
6540 order to make it easier for upstream authors to change traits
6541 without breaking downstream code.
6542 * Digits of binary and octal literals are [lexed more eagerly][lex] to
6543 improve error messages and macro behavior. For example, `0b1234` is
6544 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
6545 * Trait bounds [are always invariant][inv], eliminating the need for
6546 the `PhantomFn` and `MarkerTrait` lang items, which have been
6548 * ["-" is no longer a valid character in crate names][cr], the `extern crate
6549 "foo" as bar` syntax has been replaced with `extern crate foo as
6550 bar`, and Cargo now automatically translates "-" in *package* names
6551 to underscore for the crate name.
6552 * [Lifetime shadowing is an error][lt].
6553 * [`Send` no longer implies `'static`][send-rfc].
6554 * [UFCS now supports trait-less associated paths][moar-ufcs] like
6555 `MyType::default()`.
6556 * Primitive types [now have inherent methods][prim-inherent],
6557 obviating the need for extension traits like `SliceExt`.
6558 * Methods with `Self: Sized` in their `where` clause are [considered
6559 object-safe][self-sized], allowing many extension traits like
6560 `IteratorExt` to be merged into the traits they extended.
6561 * You can now [refer to associated types][assoc-where] whose
6562 corresponding trait bounds appear only in a `where` clause.
6563 * The final bits of [OIBIT landed][oibit-final], meaning that traits
6564 like `Send` and `Sync` are now library-defined.
6565 * A [Reflect trait][reflect] was introduced, which means that
6566 downcasting via the `Any` trait is effectively limited to concrete
6567 types. This helps retain the potentially-important "parametricity"
6568 property: generic code cannot behave differently for different type
6569 arguments except in minor ways.
6570 * The `unsafe_destructor` feature is now deprecated in favor of the
6571 [new `dropck`][dropck]. This change is a major reduction in unsafe
6577 * The `thread_local` module [has been renamed to `std::thread`][th].
6578 * The methods of `IteratorExt` [have been moved to the `Iterator`
6580 * Several traits that implement Rust's conventions for type
6581 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
6582 [centralized in the `std::convert` module][con].
6583 * The `FromError` trait [was removed in favor of `From`][fe].
6584 * The basic sleep function [has moved to
6585 `std::thread::sleep_ms`][slp].
6586 * The `splitn` function now takes an `n` parameter that represents the
6587 number of items yielded by the returned iterator [instead of the
6588 number of 'splits'][spl].
6589 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
6590 * [Derived implementations of `PartialOrd` now order enums according
6591 to their explicitly-assigned discriminants][po].
6592 * [Methods for searching strings are generic over `Pattern`s][pat],
6593 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
6595 * [In method resolution, object methods are resolved before inherent
6597 * [`String::from_str` has been deprecated in favor of the `From` impl,
6598 `String::from`][sf].
6599 * [`io::Error` implements `Sync`][ios].
6600 * [The `words` method on `&str` has been replaced with
6601 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
6603 * The new path and IO modules are complete and `#[stable]`. This
6604 was the major library focus for this cycle.
6605 * The path API was [revised][path-normalize] to normalize `.`,
6606 adjusting the tradeoffs in favor of the most common usage.
6607 * A large number of remaining APIs in `std` were also stabilized
6608 during this cycle; about 75% of the non-deprecated API surface
6610 * The new [string pattern API][string-pattern] landed, which makes
6611 the string slice API much more internally consistent and flexible.
6612 * A new set of [generic conversion traits][conversion] replaced
6613 many existing ad hoc traits.
6614 * Generic numeric traits were [completely removed][num-traits]. This
6615 was made possible thanks to inherent methods for primitive types,
6616 and the removal gives maximal flexibility for designing a numeric
6617 hierarchy in the future.
6618 * The `Fn` traits are now related via [inheritance][fn-inherit]
6619 and provide ergonomic [blanket implementations][fn-blanket].
6620 * The `Index` and `IndexMut` traits were changed to
6621 [take the index by value][index-value], enabling code like
6622 `hash_map["string"]` to work.
6623 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
6624 `Copy` data is known to be `Clone` as well.
6629 * Many errors now have extended explanations that can be accessed with
6630 the `--explain` flag to `rustc`.
6631 * Many new examples have been added to the standard library
6633 * rustdoc has received a number of improvements focused on completion
6635 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
6636 * Much headway was made on ecosystem-wide CI, making it possible
6637 to [compare builds for breakage][ci-compare].
6640 [crates.io]: http://crates.io
6641 [clo]: https://github.com/rust-lang/rust/pull/24034
6642 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
6643 [con]: https://github.com/rust-lang/rust/pull/23875
6644 [cr]: https://github.com/rust-lang/rust/pull/23419
6645 [fe]: https://github.com/rust-lang/rust/pull/23879
6646 [ie]: https://github.com/rust-lang/rust/pull/23300
6647 [inv]: https://github.com/rust-lang/rust/pull/23938
6648 [ios]: https://github.com/rust-lang/rust/pull/24133
6649 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
6650 [lt]: https://github.com/rust-lang/rust/pull/24057
6651 [meth]: https://github.com/rust-lang/rust/pull/24056
6652 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
6653 [po]: https://github.com/rust-lang/rust/pull/24270
6654 [sf]: https://github.com/rust-lang/rust/pull/24517
6655 [slp]: https://github.com/rust-lang/rust/pull/23949
6656 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
6657 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
6658 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
6659 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
6660 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
6661 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
6662 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
6663 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
6664 [self-sized]: https://github.com/rust-lang/rust/pull/22301
6665 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
6666 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
6667 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
6668 [reflect]: https://github.com/rust-lang/rust/pull/23712
6669 [conversion]: https://github.com/rust-lang/rfcs/pull/529
6670 [num-traits]: https://github.com/rust-lang/rust/pull/23549
6671 [index-value]: https://github.com/rust-lang/rust/pull/23601
6672 [dropck]: https://github.com/rust-lang/rfcs/pull/769
6673 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
6674 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
6675 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
6676 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
6677 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
6680 Version 1.0.0-alpha.2 (2015-02-20)
6681 =====================================
6683 * ~1300 changes, numerous bugfixes
6687 * The various I/O modules were [overhauled][io-rfc] to reduce
6688 unnecessary abstractions and provide better interoperation with
6689 the underlying platform. The old `io` module remains temporarily
6691 * The standard library now [participates in feature gating][feat],
6692 so use of unstable libraries now requires a `#![feature(...)]`
6693 attribute. The impact of this change is [described on the
6694 forum][feat-forum]. [RFC][feat-rfc].
6698 * `for` loops [now operate on the `IntoIterator` trait][into],
6699 which eliminates the need to call `.iter()`, etc. to iterate
6700 over collections. There are some new subtleties to remember
6701 though regarding what sort of iterators various types yield, in
6702 particular that `for foo in bar { }` yields values from a move
6703 iterator, destroying the original collection. [RFC][into-rfc].
6704 * Objects now have [default lifetime bounds][obj], so you don't
6705 have to write `Box<Trait+'static>` when you don't care about
6706 storing references. [RFC][obj-rfc].
6707 * In types that implement `Drop`, [lifetimes must outlive the
6708 value][drop]. This will soon make it possible to safely
6709 implement `Drop` for types where `#[unsafe_destructor]` is now
6710 required. Read the [gorgeous RFC][drop-rfc] for details.
6711 * The fully qualified <T as Trait>::X syntax lets you set the Self
6712 type for a trait method or associated type. [RFC][ufcs-rfc].
6713 * References to types that implement `Deref<U>` now [automatically
6714 coerce to references][deref] to the dereferenced type `U`,
6715 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
6716 should eliminate many unsightly uses of `&*`, as when converting
6717 from references to vectors into references to
6718 slices. [RFC][deref-rfc].
6719 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
6720 `|:|`) is obsolete and closure kind is inferred from context.
6721 * [`Self` is a keyword][Self].
6725 * The `Show` and `String` formatting traits [have been
6726 renamed][fmt] to `Debug` and `Display` to more clearly reflect
6727 their related purposes. Automatically getting a string
6728 conversion to use with `format!("{:?}", something_to_debug)` is
6729 now written `#[derive(Debug)]`.
6730 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
6731 OsStr}`, provide strings in platform-specific encodings for easier
6732 interop with system APIs. [RFC][osstr-rfc].
6733 * The `boxed::into_raw` and `Box::from_raw` functions [convert
6734 between `Box<T>` and `*mut T`][boxraw], a common pattern for
6735 creating raw pointers.
6739 * Certain long error messages of the form 'expected foo found bar'
6740 are now [split neatly across multiple
6741 lines][multiline]. Examples in the PR.
6742 * On Unix Rust can be [uninstalled][un] by running
6743 `/usr/local/lib/rustlib/uninstall.sh`.
6744 * The `#[rustc_on_unimplemented]` attribute, requiring the
6745 'on_unimplemented' feature, lets rustc [display custom error
6746 messages when a trait is expected to be implemented for a type
6751 * Rust is tested against a [LALR grammar][lalr], which parses
6752 almost all the Rust files that rustc does.
6754 [boxraw]: https://github.com/rust-lang/rust/pull/21318
6755 [close]: https://github.com/rust-lang/rust/pull/21843
6756 [deref]: https://github.com/rust-lang/rust/pull/21351
6757 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
6758 [drop]: https://github.com/rust-lang/rust/pull/21972
6759 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6760 [feat]: https://github.com/rust-lang/rust/pull/21248
6761 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
6762 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
6763 [fmt]: https://github.com/rust-lang/rust/pull/21457
6764 [into]: https://github.com/rust-lang/rust/pull/20790
6765 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
6766 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6767 [lalr]: https://github.com/rust-lang/rust/pull/21452
6768 [multiline]: https://github.com/rust-lang/rust/pull/19870
6769 [obj]: https://github.com/rust-lang/rust/pull/22230
6770 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
6771 [onun]: https://github.com/rust-lang/rust/pull/20889
6772 [osstr]: https://github.com/rust-lang/rust/pull/21488
6773 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6774 [Self]: https://github.com/rust-lang/rust/pull/22158
6775 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
6776 [un]: https://github.com/rust-lang/rust/pull/22256
6779 Version 1.0.0-alpha (2015-01-09)
6780 ==================================
6782 * ~2400 changes, numerous bugfixes
6786 * The language itself is considered feature complete for 1.0,
6787 though there will be many usability improvements and bugfixes
6788 before the final release.
6789 * Nearly 50% of the public API surface of the standard library has
6790 been declared 'stable'. Those interfaces are unlikely to change
6792 * The long-running debate over integer types has been
6793 [settled][ints]: Rust will ship with types named `isize` and
6794 `usize`, rather than `int` and `uint`, for pointer-sized
6795 integers. Guidelines will be rolled out during the alpha cycle.
6796 * Most crates that are not `std` have been moved out of the Rust
6797 distribution into the Cargo ecosystem so they can evolve
6798 separately and don't need to be stabilized as quickly, including
6799 'time', 'getopts', 'num', 'regex', and 'term'.
6800 * Documentation continues to be expanded with more API coverage, more
6801 examples, and more in-depth explanations. The guides have been
6802 consolidated into [The Rust Programming Language][trpl].
6803 * "[Rust By Example][rbe]" is now maintained by the Rust team.
6804 * All official Rust binary installers now come with [Cargo], the
6805 Rust package manager.
6809 * Closures have been [completely redesigned][unboxed] to be
6810 implemented in terms of traits, can now be used as generic type
6811 bounds and thus monomorphized and inlined, or via an opaque
6812 pointer (boxed) as in the old system. The new system is often
6813 referred to as 'unboxed' closures.
6814 * Traits now support [associated types][assoc], allowing families
6815 of related types to be defined together and used generically in
6817 * Enum variants are [namespaced by their type names][enum].
6818 * [`where` clauses][where] provide a more versatile and attractive
6819 syntax for specifying generic bounds, though the previous syntax
6821 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
6823 * Rust [no longer has a runtime][rt] of any description, and only
6824 supports OS threads, not green threads.
6825 * At long last, Rust has been overhauled for 'dynamically-sized
6826 types' ([DST]), which integrates 'fat pointers' (object types,
6827 arrays, and `str`) more deeply into the type system, making it
6829 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
6830 `..j` that produce range types and which, when combined with the
6831 `Index` operator and multidispatch, leads to a convenient slice
6833 * The new range syntax revealed an ambiguity in the fixed-length
6834 array syntax, so now fixed length arrays [are written `[T;
6836 * The `Copy` trait is no longer implemented automatically. Unsafe
6837 pointers no longer implement `Sync` and `Send` so types
6838 containing them don't automatically either. `Sync` and `Send`
6839 are now 'unsafe traits' so one can "forcibly" implement them via
6840 `unsafe impl` if a type confirms to the requirements for them
6841 even though the internals do not (e.g. structs containing unsafe
6842 pointers like `Arc`). These changes are intended to prevent some
6843 footguns and are collectively known as [opt-in built-in
6844 traits][oibit] (though `Sync` and `Send` will soon become pure
6845 library types unknown to the compiler).
6846 * Operator traits now take their operands [by value][ops], and
6847 comparison traits can use multidispatch to compare one type
6848 against multiple other types, allowing e.g. `String` to be
6849 compared with `&str`.
6850 * `if let` and `while let` are no longer feature-gated.
6851 * Rust has adopted a more [uniform syntax for escaping unicode
6852 characters][unicode].
6853 * `macro_rules!` [has been declared stable][mac]. Though it is a
6854 flawed system it is sufficiently popular that it must be usable
6855 for 1.0. Effort has gone into [future-proofing][mac-future] it
6856 in ways that will allow other macro systems to be developed in
6857 parallel, and won't otherwise impact the evolution of the
6859 * The prelude has been [pared back significantly][prelude] such
6860 that it is the minimum necessary to support the most pervasive
6861 code patterns, and through [generalized where clauses][where]
6862 many of the prelude extension traits have been consolidated.
6863 * Rust's rudimentary reflection [has been removed][refl], as it
6864 incurred too much code generation for little benefit.
6865 * [Struct variants][structvars] are no longer feature-gated.
6866 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
6867 known as 'higher-ranked trait bounds', this crucially allows
6868 unboxed closures to work.
6869 * Macros invocations surrounded by parens or square brackets and
6870 not terminated by a semicolon are [parsed as
6871 expressions][macros], which makes expressions like `vec![1i32,
6872 2, 3].len()` work as expected.
6873 * Trait objects now implement their traits automatically, and
6874 traits that can be coerced to objects now must be [object
6876 * Automatically deriving traits is now done with `#[derive(...)]`
6877 not `#[deriving(...)]` for [consistency with other naming
6878 conventions][derive].
6879 * Importing the containing module or enum at the same time as
6880 items or variants they contain is [now done with `self` instead
6881 of `mod`][self], as in use `foo::{self, bar}`
6882 * Glob imports are no longer feature-gated.
6883 * The `box` operator and `box` patterns have been feature-gated
6884 pending a redesign. For now unique boxes should be allocated
6885 like other containers, with `Box::new`.
6889 * A [series][coll1] of [efforts][coll2] to establish
6890 [conventions][coll3] for collections types has resulted in API
6891 improvements throughout the standard library.
6892 * New [APIs for error handling][err] provide ergonomic interop
6893 between error types, and [new conventions][err-conv] describe
6894 more clearly the recommended error handling strategies in Rust.
6895 * The `fail!` macro has been renamed to [`panic!`][panic] so that
6896 it is easier to discuss failure in the context of error handling
6897 without making clarifications as to whether you are referring to
6898 the 'fail' macro or failure more generally.
6899 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
6900 syscall when available.
6901 * The 'serialize' crate has been renamed 'rustc-serialize' and
6902 moved out of the distribution to Cargo. Although it is widely
6903 used now, it is expected to be superseded in the near future.
6904 * The `Show` formatter, typically implemented with
6905 `#[derive(Show)]` is [now requested with the `{:?}`
6906 specifier][show] and is intended for use by all types, for uses
6907 such as `println!` debugging. The new `String` formatter must be
6908 implemented by hand, uses the `{}` specifier, and is intended
6909 for full-fidelity conversions of things that can logically be
6910 represented as strings.
6914 * [Flexible target specification][flex] allows rustc's code
6915 generation to be configured to support otherwise-unsupported
6917 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6918 respective debuggers with Rust-appropriate pretty-printing.
6919 * The Windows installation of Rust is distributed with the
6920 MinGW components currently required to link binaries on that
6925 * Nullable enum optimizations have been extended to more types so
6926 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6927 space than the inner types themselves.
6928 * Work has begun on supporting AArch64.
6930 [Cargo]: https://crates.io
6931 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6932 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6933 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6934 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6935 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6936 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6937 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6938 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6939 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6940 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6941 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6942 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6943 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6944 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6945 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6946 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6947 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6948 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6949 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6950 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6951 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6952 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6953 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6954 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6955 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6956 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6957 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6958 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6959 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6960 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6961 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6962 [trpl]: https://doc.rust-lang.org/book/index.html
6963 [rbe]: http://rustbyexample.com/
6966 Version 0.12.0 (2014-10-09)
6967 =============================
6969 * ~1900 changes, numerous bugfixes
6973 * The introductory documentation (now called The Rust Guide) has
6974 been completely rewritten, as have a number of supplementary
6976 * Rust's package manager, Cargo, continues to improve and is
6977 sometimes considered to be quite awesome.
6978 * Many API's in `std` have been reviewed and updated for
6979 consistency with the in-development Rust coding
6980 guidelines. The standard library documentation tracks
6981 stabilization progress.
6982 * Minor libraries have been moved out-of-tree to the rust-lang org
6983 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6984 be installed with Cargo.
6985 * Lifetime elision allows lifetime annotations to be left off of
6986 function declarations in many common scenarios.
6987 * Rust now works on 64-bit Windows.
6990 * Indexing can be overloaded with the `Index` and `IndexMut`
6992 * The `if let` construct takes a branch only if the `let` pattern
6993 matches, currently behind the 'if_let' feature gate.
6994 * 'where clauses', a more flexible syntax for specifying trait
6995 bounds that is more aesthetic, have been added for traits and
6996 free functions. Where clauses will in the future make it
6997 possible to constrain associated types, which would be
6998 impossible with the existing syntax.
6999 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7000 the 'slicing_syntax' feature gate, and can be overloaded with
7001 the `Slice` or `SliceMut` traits.
7002 * The syntax for matching of sub-slices has been changed to use a
7003 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7004 consistency with other uses of `..` and to future-proof
7005 potential additional uses of the syntax.
7006 * The syntax for matching inclusive ranges in patterns has changed
7007 from `0..3` to `0...4` to be consistent with the exclusive range
7009 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7010 c]`) has been put behind the 'advanced_slice_patterns' feature
7011 gate and may be removed in the future.
7012 * Components of tuples and tuple structs can be extracted using
7013 the `value.0` syntax, currently behind the `tuple_indexing`
7015 * The `#[crate_id]` attribute is no longer supported; versioning
7016 is handled by the package manager.
7017 * Renaming crate imports are now written `extern crate foo as bar`
7018 instead of `extern crate bar = foo`.
7019 * Renaming use statements are now written `use foo as bar` instead
7021 * `let` and `match` bindings and argument names in macros are now
7023 * The new, more efficient, closure types ('unboxed closures') have
7024 been added under a feature gate, 'unboxed_closures'. These will
7025 soon replace the existing closure types, once higher-ranked
7026 trait lifetimes are added to the language.
7027 * `move` has been added as a keyword, for indicating closures
7028 that capture by value.
7029 * Mutation and assignment is no longer allowed in pattern guards.
7030 * Generic structs and enums can now have trait bounds.
7031 * The `Share` trait is now called `Sync` to free up the term
7032 'shared' to refer to 'shared reference' (the default reference
7034 * Dynamically-sized types have been mostly implemented,
7035 unifying the behavior of fat-pointer types with the rest of the
7037 * As part of dynamically-sized types, the `Sized` trait has been
7038 introduced, which qualifying types implement by default, and
7039 which type parameters expect by default. To specify that a type
7040 parameter does not need to be sized, write `<Sized? T>`. Most
7041 types are `Sized`, notable exceptions being unsized arrays
7042 (`[T]`) and trait types.
7043 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7044 * Lifetime bounds can now be applied to type parameters and object
7046 * The old, reference counted GC type, `Gc<T>` which was once
7047 denoted by the `@` sigil, has finally been removed. GC will be
7048 revisited in the future.
7051 * Library documentation has been improved for a number of modules.
7052 * Bit-vectors, collections::bitv has been modernized.
7053 * The url crate is deprecated in favor of
7054 http://github.com/servo/rust-url, which can be installed with
7056 * Most I/O stream types can be cloned and subsequently closed from
7058 * A `std::time::Duration` type has been added for use in I/O
7059 methods that rely on timers, as well as in the 'time' crate's
7060 `Timespec` arithmetic.
7061 * The runtime I/O abstraction layer that enabled the green thread
7062 scheduler to do non-thread-blocking I/O has been removed, along
7063 with the libuv-based implementation employed by the green thread
7064 scheduler. This will greatly simplify the future I/O work.
7065 * `collections::btree` has been rewritten to have a more
7066 idiomatic and efficient design.
7069 * rustdoc output now indicates the stability levels of API's.
7070 * The `--crate-name` flag can specify the name of the crate
7071 being compiled, like `#[crate_name]`.
7072 * The `-C metadata` specifies additional metadata to hash into
7073 symbol names, and `-C extra-filename` specifies additional
7074 information to put into the output filename, for use by the
7075 package manager for versioning.
7076 * debug info generation has continued to improve and should be
7077 more reliable under both gdb and lldb.
7078 * rustc has experimental support for compiling in parallel
7079 using the `-C codegen-units` flag.
7080 * rustc no longer encodes rpath information into binaries by
7084 * Stack usage has been optimized with LLVM lifetime annotations.
7085 * Official Rust binaries on Linux are more compatible with older
7086 kernels and distributions, built on CentOS 5.10.
7089 Version 0.11.0 (2014-07-02)
7090 ==========================
7092 * ~1700 changes, numerous bugfixes
7095 * ~[T] has been removed from the language. This type is superseded by
7097 * ~str has been removed from the language. This type is superseded by
7099 * ~T has been removed from the language. This type is superseded by the
7101 * @T has been removed from the language. This type is superseded by the
7102 standard library's std::gc::Gc<T> type.
7103 * Struct fields are now all private by default.
7104 * Vector indices and shift amounts are both required to be a `uint`
7105 instead of any integral type.
7106 * Byte character, byte string, and raw byte string literals are now all
7107 supported by prefixing the normal literal with a `b`.
7108 * Multiple ABIs are no longer allowed in an ABI string
7109 * The syntax for lifetimes on closures/procedures has been tweaked
7110 slightly: `<'a>|A, B|: 'b + K -> T`
7111 * Floating point modulus has been removed from the language; however it
7112 is still provided by a library implementation.
7113 * Private enum variants are now disallowed.
7114 * The `priv` keyword has been removed from the language.
7115 * A closure can no longer be invoked through a &-pointer.
7116 * The `use foo, bar, baz;` syntax has been removed from the language.
7117 * The transmute intrinsic no longer works on type parameters.
7118 * Statics now allow blocks/items in their definition.
7119 * Trait bounds are separated from objects with + instead of : now.
7120 * Objects can no longer be read while they are mutably borrowed.
7121 * The address of a static is now marked as insignificant unless the
7122 #[inline(never)] attribute is placed it.
7123 * The #[unsafe_destructor] attribute is now behind a feature gate.
7124 * Struct literals are no longer allowed in ambiguous positions such as
7125 if, while, match, and for..in.
7126 * Declaration of lang items and intrinsics are now feature-gated by
7128 * Integral literals no longer default to `int`, and floating point
7129 literals no longer default to `f64`. Literals must be suffixed with an
7130 appropriate type if inference cannot determine the type of the
7132 * The Box<T> type is no longer implicitly borrowed to &mut T.
7133 * Procedures are now required to not capture borrowed references.
7136 * The standard library is now a "facade" over a number of underlying
7137 libraries. This means that development on the standard library should
7138 be speedier due to smaller crates, as well as a clearer line between
7140 * A new library, libcore, lives under the standard library's facade
7141 which is Rust's "0-assumption" library, suitable for embedded and
7142 kernel development for example.
7143 * A regex crate has been added to the standard distribution. This crate
7144 includes statically compiled regular expressions.
7145 * The unwrap/unwrap_err methods on Result require a Show bound for
7146 better error messages.
7147 * The return types of the std::comm primitives have been centralized
7148 around the Result type.
7149 * A number of I/O primitives have gained the ability to time out their
7151 * A number of I/O primitives have gained the ability to close their
7152 reading/writing halves to cancel pending operations.
7153 * Reverse iterator methods have been removed in favor of `rev()` on
7154 their forward-iteration counterparts.
7155 * A bitflags! macro has been added to enable easy interop with C and
7156 management of bit flags.
7157 * A debug_assert! macro is now provided which is disabled when
7158 `--cfg ndebug` is passed to the compiler.
7159 * A graphviz crate has been added for creating .dot files.
7160 * The std::cast module has been migrated into std::mem.
7161 * The std::local_data api has been migrated from freestanding functions
7162 to being based on methods.
7163 * The Pod trait has been renamed to Copy.
7164 * jemalloc has been added as the default allocator for types.
7165 * The API for allocating memory has been changed to use proper alignment
7166 and sized deallocation
7167 * Connecting a TcpStream or binding a TcpListener is now based on a
7168 string address and a u16 port. This allows connecting to a hostname as
7170 * The Reader trait now contains a core method, read_at_least(), which
7171 correctly handles many repeated 0-length reads.
7172 * The process-spawning API is now centered around a builder-style
7174 * The :? printing qualifier has been moved from the standard library to
7175 an external libdebug crate.
7176 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
7177 have been renamed to Eq/Ord.
7178 * The select/plural methods have been removed from format!. The escapes
7179 for { and } have also changed from \{ and \} to {{ and }},
7181 * The TaskBuilder API has been re-worked to be a true builder, and
7182 extension traits for spawning native/green tasks have been added.
7185 * All breaking changes to the language or libraries now have their
7186 commit message annotated with `[breaking-change]` to allow for easy
7187 discovery of breaking changes.
7188 * The compiler will now try to suggest how to annotate lifetimes if a
7189 lifetime-related error occurs.
7190 * Debug info continues to be improved greatly with general bug fixes and
7191 better support for situations like link time optimization (LTO).
7192 * Usage of syntax extensions when cross-compiling has been fixed.
7193 * Functionality equivalent to GCC & Clang's -ffunction-sections,
7194 -fdata-sections and --gc-sections has been enabled by default
7195 * The compiler is now stricter about where it will load module files
7196 from when a module is declared via `mod foo;`.
7197 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
7198 Syntax extensions are now discovered via a "plugin registrar" type
7199 which will be extended in the future to other various plugins.
7200 * Lints have been restructured to allow for dynamically loadable lints.
7201 * A number of rustdoc improvements:
7202 * The HTML output has been visually redesigned.
7203 * Markdown is now powered by hoedown instead of sundown.
7204 * Searching heuristics have been greatly improved.
7205 * The search index has been reduced in size by a great amount.
7206 * Cross-crate documentation via `pub use` has been greatly improved.
7207 * Primitive types are now hyperlinked and documented.
7208 * Documentation has been moved from static.rust-lang.org/doc to
7210 * A new sandbox, play.rust-lang.org, is available for running and
7211 sharing rust code examples on-line.
7212 * Unused attributes are now more robustly warned about.
7213 * The dead_code lint now warns about unused struct fields.
7214 * Cross-compiling to iOS is now supported.
7215 * Cross-compiling to mipsel is now supported.
7216 * Stability attributes are now inherited by default and no longer apply
7217 to intra-crate usage, only inter-crate usage.
7218 * Error message related to non-exhaustive match expressions have been
7222 Version 0.10 (2014-04-03)
7223 =========================
7225 * ~1500 changes, numerous bugfixes
7228 * A new RFC process is now in place for modifying the language.
7229 * Patterns with `@`-pointers have been removed from the language.
7230 * Patterns with unique vectors (`~[T]`) have been removed from the
7232 * Patterns with unique strings (`~str`) have been removed from the
7234 * `@str` has been removed from the language.
7235 * `@[T]` has been removed from the language.
7236 * `@self` has been removed from the language.
7237 * `@Trait` has been removed from the language.
7238 * Headers on `~` allocations which contain `@` boxes inside the type for
7239 reference counting have been removed.
7240 * The semantics around the lifetimes of temporary expressions have changed,
7241 see #3511 and #11585 for more information.
7242 * Cross-crate syntax extensions are now possible, but feature gated. See
7243 #11151 for more information. This includes both `macro_rules!` macros as
7244 well as syntax extensions such as `format!`.
7245 * New lint modes have been added, and older ones have been turned on to be
7247 * Unnecessary parentheses
7250 * Uppercase variables
7251 * Publicly visible private types
7252 * `#[deriving]` with raw pointers
7253 * Unsafe functions can no longer be coerced to closures.
7254 * Various obscure macros such as `log_syntax!` are now behind feature gates.
7255 * The `#[simd]` attribute is now behind a feature gate.
7256 * Visibility is no longer allowed on `extern crate` statements, and
7257 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
7258 * Trailing commas are now allowed in argument lists and tuple patterns.
7259 * The `do` keyword has been removed, it is now a reserved keyword.
7260 * Default type parameters have been implemented, but are feature gated.
7261 * Borrowed variables through captures in closures are now considered soundly.
7262 * `extern mod` is now `extern crate`
7263 * The `Freeze` trait has been removed.
7264 * The `Share` trait has been added for types that can be shared among
7266 * Labels in macros are now hygienic.
7267 * Expression/statement macro invocations can be delimited with `{}` now.
7268 * Treatment of types allowed in `static mut` locations has been tweaked.
7269 * The `*` and `.` operators are now overloadable through the `Deref` and
7271 * `~Trait` and `proc` no longer have `Send` bounds by default.
7272 * Partial type hints are now supported with the `_` type marker.
7273 * An `Unsafe` type was introduced for interior mutability. It is now
7274 considered undefined to transmute from `&T` to `&mut T` without using the
7276 * The #[linkage] attribute was implemented for extern statics/functions.
7277 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
7278 * `Pod` was renamed to `Copy`.
7281 * The `libextra` library has been removed. It has now been decomposed into
7282 component libraries with smaller and more focused nuggets of
7283 functionality. The full list of libraries can be found on the
7284 documentation index page.
7285 * std: `std::condition` has been removed. All I/O errors are now propagated
7286 through the `Result` type. In order to assist with error handling, a
7287 `try!` macro for unwrapping errors with an early return and a lint for
7288 unused results has been added. See #12039 for more information.
7289 * std: The `vec` module has been renamed to `slice`.
7290 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
7291 This will become the only growable vector in the future.
7292 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
7293 are now found at `std::io::BufferedReader` instead of
7294 `std::io::buffered::BufferedReader`.
7295 * std: `print` and `println` are no longer in the prelude, the `print!` and
7296 `println!` macros are intended to be used instead.
7297 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
7298 attempts to statically prevent cycles.
7299 * std: The standard distribution is adopting the policy of pushing failure
7300 to the user rather than failing in libraries. Many functions (such as
7301 `slice::last()`) now return `Option<T>` instead of `T` + failing.
7302 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
7303 deriving mode: `#[deriving(Show)]`.
7304 * std: `ToStr` is now implemented for all types implementing `Show`.
7305 * std: The formatting trait methods now take `&self` instead of `&T`
7306 * std: The `invert()` method on iterators has been renamed to `rev()`
7307 * std: `std::num` has seen a reduction in the genericity of its traits,
7308 consolidating functionality into a few core traits.
7309 * std: Backtraces are now printed on task failure if the environment
7310 variable `RUST_BACKTRACE` is present.
7311 * std: Naming conventions for iterators have been standardized. More details
7312 can be found on the wiki's style guide.
7313 * std: `eof()` has been removed from the `Reader` trait. Specific types may
7314 still implement the function.
7315 * std: Networking types are now cloneable to allow simultaneous reads/writes.
7316 * std: `assert_approx_eq!` has been removed
7317 * std: The `e` and `E` formatting specifiers for floats have been added to
7318 print them in exponential notation.
7319 * std: The `Times` trait has been removed
7320 * std: Indications of variance and opting out of builtin bounds is done
7321 through marker types in `std::kinds::marker` now
7322 * std: `hash` has been rewritten, `IterBytes` has been removed, and
7323 `#[deriving(Hash)]` is now possible.
7324 * std: `SharedChan` has been removed, `Sender` is now cloneable.
7325 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
7326 * std: `Chan::new` is now `channel()`.
7327 * std: A new synchronous channel type has been implemented.
7328 * std: A `select!` macro is now provided for selecting over `Receiver`s.
7329 * std: `hashmap` and `trie` have been moved to `libcollections`
7330 * std: `run` has been rolled into `io::process`
7331 * std: `assert_eq!` now uses `{}` instead of `{:?}`
7332 * std: The equality and comparison traits have seen some reorganization.
7333 * std: `rand` has moved to `librand`.
7334 * std: `to_{lower,upper}case` has been implemented for `char`.
7335 * std: Logging has been moved to `liblog`.
7336 * collections: `HashMap` has been rewritten for higher performance and less
7338 * native: The default runtime is now `libnative`. If `libgreen` is desired,
7339 it can be booted manually. The runtime guide has more information and
7341 * native: All I/O functionality except signals has been implemented.
7342 * green: Task spawning with `libgreen` has been optimized with stack caching
7343 and various trimming of code.
7344 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
7345 * sync: The `extra::sync` module has been updated to modern rust (and moved
7346 to the `sync` library), tweaking and improving various interfaces while
7347 dropping redundant functionality.
7348 * sync: A new `Barrier` type has been added to the `sync` library.
7349 * sync: An efficient mutex for native and green tasks has been implemented.
7350 * serialize: The `base64` module has seen some improvement. It treats
7351 newlines better, has non-string error values, and has seen general
7353 * fourcc: A `fourcc!` macro was introduced
7354 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
7355 hexadecimal literal.
7358 * `rustpkg` has been deprecated and removed from the main repository. Its
7359 replacement, `cargo`, is under development.
7360 * Nightly builds of rust are now available
7361 * The memory usage of rustc has been improved many times throughout this
7363 * The build process supports disabling rpath support for the rustc binary
7365 * Code generation has improved in some cases, giving more information to the
7366 LLVM optimization passes to enable more extensive optimizations.
7367 * Debuginfo compatibility with lldb on OSX has been restored.
7368 * The master branch is now gated on an android bot, making building for
7369 android much more reliable.
7370 * Output flags have been centralized into one `--emit` flag.
7371 * Crate type flags have been centralized into one `--crate-type` flag.
7372 * Codegen flags have been consolidated behind a `-C` flag.
7373 * Linking against outdated crates now has improved error messages.
7374 * Error messages with lifetimes will often suggest how to annotate the
7375 function to fix the error.
7376 * Many more types are documented in the standard library, and new guides
7378 * Many `rustdoc` improvements:
7379 * code blocks are syntax highlighted.
7380 * render standalone markdown files.
7381 * the --test flag tests all code blocks by default.
7382 * exported macros are displayed.
7383 * re-exported types have their documentation inlined at the location of the
7385 * search works across crates that have been rendered to the same output
7389 Version 0.9 (2014-01-09)
7390 ==========================
7392 * ~1800 changes, numerous bugfixes
7395 * The `float` type has been removed. Use `f32` or `f64` instead.
7396 * A new facility for enabling experimental features (feature gating) has
7397 been added, using the crate-level `#[feature(foo)]` attribute.
7398 * Managed boxes (@) are now behind a feature gate
7399 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
7400 standard library's `Gc` or `Rc` types instead.
7401 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
7402 * Jumping back to the top of a loop is now done with `continue` instead of
7404 * Strings can no longer be mutated through index assignment.
7405 * Raw strings can be created via the basic `r"foo"` syntax or with matched
7406 hash delimiters, as in `r###"foo"###`.
7407 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
7409 * The `&fn` type is now written `|args| -> ret` to match the literal form.
7410 * `@fn`s have been removed.
7411 * `do` only works with procs in order to make it obvious what the cost
7413 * Single-element tuple-like structs can no longer be dereferenced to
7414 obtain the inner value. A more comprehensive solution for overloading
7415 the dereference operator will be provided in the future.
7416 * The `#[link(...)]` attribute has been replaced with
7417 `#[crate_id = "name#vers"]`.
7418 * Empty `impl`s must be terminated with empty braces and may not be
7419 terminated with a semicolon.
7420 * Keywords are no longer allowed as lifetime names; the `self` lifetime
7421 no longer has any special meaning.
7422 * The old `fmt!` string formatting macro has been removed.
7423 * `printf!` and `printfln!` (old-style formatting) removed in favor of
7424 `print!` and `println!`.
7425 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
7426 * The `extern mod foo (name = "bar")` syntax has been removed. Use
7427 `extern mod foo = "bar"` instead.
7428 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
7429 * Macros can have attributes.
7430 * Macros can expand to items with attributes.
7431 * Macros can expand to multiple items.
7432 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
7433 * Comments may be nested.
7434 * Values automatically coerce to trait objects they implement, without
7436 * Enum discriminants are no longer an entire word but as small as needed to
7437 contain all the variants. The `repr` attribute can be used to override
7438 the discriminant size, as in `#[repr(int)]` for integer-sized, and
7439 `#[repr(C)]` to match C enums.
7440 * Non-string literals are not allowed in attributes (they never worked).
7441 * The FFI now supports variadic functions.
7442 * Octal numeric literals, as in `0o7777`.
7443 * The `concat!` syntax extension performs compile-time string concatenation.
7444 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
7445 removed as Rust no longer uses segmented stacks.
7446 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
7447 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
7448 not `*`; ignoring remaining fields of a struct is also done with `..`,
7449 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
7450 * `rustc` supports the "win64" calling convention via `extern "win64"`.
7451 * `rustc` supports the "system" calling convention, which defaults to the
7452 preferred convention for the target platform, "stdcall" on 32-bit Windows,
7454 * The `type_overflow` lint (default: warn) checks literals for overflow.
7455 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
7456 * The `attribute_usage` lint (default: warn) warns about unknown
7458 * The `unknown_features` lint (default: warn) warns about unknown
7460 * The `dead_code` lint (default: warn) checks for dead code.
7461 * Rust libraries can be linked statically to one another
7462 * `#[link_args]` is behind the `link_args` feature gate.
7463 * Native libraries are now linked with `#[link(name = "foo")]`
7464 * Native libraries can be statically linked to a rust crate
7465 (`#[link(name = "foo", kind = "static")]`).
7466 * Native OS X frameworks are now officially supported
7467 (`#[link(name = "foo", kind = "framework")]`).
7468 * The `#[thread_local]` attribute creates thread-local (not task-local)
7469 variables. Currently behind the `thread_local` feature gate.
7470 * The `return` keyword may be used in closures.
7471 * Types that can be copied via a memcpy implement the `Pod` kind.
7472 * The `cfg` attribute can now be used on struct fields and enum variants.
7475 * std: The `option` and `result` API's have been overhauled to make them
7476 simpler, more consistent, and more composable.
7477 * std: The entire `std::io` module has been replaced with one that is
7478 more comprehensive and that properly interfaces with the underlying
7479 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
7481 * std: `io::util` contains a number of useful implementations of
7482 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
7483 `ZeroReader`, `TeeReader`.
7484 * std: The reference counted pointer type `extra::rc` moved into std.
7485 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
7486 just a wrapper around it).
7487 * std: The `Either` type has been removed.
7488 * std: `fmt::Default` can be implemented for any type to provide default
7489 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
7490 * std: The `rand` API continues to be tweaked.
7491 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
7492 on failure in gdb, is now named `rust_fail`.
7493 * std: The `each_key` and `each_value` methods on `HashMap` have been
7494 replaced by the `keys` and `values` iterators.
7495 * std: Functions dealing with type size and alignment have moved from the
7496 `sys` module to the `mem` module.
7497 * std: The `path` module was written and API changed.
7498 * std: `str::from_utf8` has been changed to cast instead of allocate.
7499 * std: `starts_with` and `ends_with` methods added to vectors via the
7500 `ImmutableEqVector` trait, which is in the prelude.
7501 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
7502 if the index is out of bounds.
7503 * std: Task failure no longer propagates between tasks, as the model was
7504 complex, expensive, and incompatible with thread-based tasks.
7505 * std: The `Any` type can be used for dynamic typing.
7506 * std: `~Any` can be passed to the `fail!` macro and retrieved via
7508 * std: Methods that produce iterators generally do not have an `_iter`
7510 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
7511 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
7512 * std: `util::ignore` renamed to `prelude::drop`.
7513 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
7515 * std: `vec::raw` has seen a lot of cleanup and API changes.
7516 * std: The standard library no longer includes any C++ code, and very
7517 minimal C, eliminating the dependency on libstdc++.
7518 * std: Runtime scheduling and I/O functionality has been factored out into
7519 extensible interfaces and is now implemented by two different crates:
7520 libnative, for native threading and I/O; and libgreen, for green threading
7521 and I/O. This paves the way for using the standard library in more limited
7522 embedded environments.
7523 * std: The `comm` module has been rewritten to be much faster, have a
7524 simpler, more consistent API, and to work for both native and green
7526 * std: All libuv dependencies have been moved into the rustuv crate.
7527 * native: New implementations of runtime scheduling on top of OS threads.
7528 * native: New native implementations of TCP, UDP, file I/O, process spawning,
7530 * green: The green thread scheduler and message passing types are almost
7532 * extra: The `flatpipes` module had bitrotted and was removed.
7533 * extra: All crypto functions have been removed and Rust now has a policy of
7534 not reimplementing crypto in the standard library. In the future crypto
7535 will be provided by external crates with bindings to established libraries.
7536 * extra: `c_vec` has been modernized.
7537 * extra: The `sort` module has been removed. Use the `sort` method on
7541 * The `rust` and `rusti` commands have been removed, due to lack of
7543 * `rustdoc` was completely rewritten.
7544 * `rustdoc` can test code examples in documentation.
7545 * `rustpkg` can test packages with the argument, 'test'.
7546 * `rustpkg` supports arbitrary dependencies, including C libraries.
7547 * `rustc`'s support for generating debug info is improved again.
7548 * `rustc` has better error reporting for unbalanced delimiters.
7549 * `rustc`'s JIT support was removed due to bitrot.
7550 * Executables and static libraries can be built with LTO (-Z lto)
7551 * `rustc` adds a `--dep-info` flag for communicating dependencies to
7555 Version 0.8 (2013-09-26)
7556 ============================
7558 * ~2200 changes, numerous bugfixes
7561 * The `for` loop syntax has changed to work with the `Iterator` trait.
7562 * At long last, unwinding works on Windows.
7563 * Default methods are ready for use.
7564 * Many trait inheritance bugs fixed.
7565 * Owned and borrowed trait objects work more reliably.
7566 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
7567 * rustc can omit emission of code for the `debug!` macro if it is passed
7569 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
7570 for foo.rs, then foo/mod.rs, and will generate an error when both are
7572 * Strings no longer contain trailing nulls. The new `std::c_str` module
7573 provides new mechanisms for converting to C strings.
7574 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
7575 * The FFI has been overhauled such that foreign functions are called directly,
7576 instead of through a stack-switching wrapper.
7577 * Calling a foreign function must be done through a Rust function with the
7578 `#[fixed_stack_segment]` attribute.
7579 * The `externfn!` macro can be used to declare both a foreign function and
7580 a `#[fixed_stack_segment]` wrapper at once.
7581 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
7582 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
7583 * `priv` is disallowed everywhere except for struct fields and enum variants.
7584 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
7585 * `ref` bindings in irrefutable patterns work correctly now.
7586 * `char` is now prevented from containing invalid code points.
7587 * Casting to `bool` is no longer allowed.
7588 * `\0` is now accepted as an escape in chars and strings.
7589 * `yield` is a reserved keyword.
7590 * `typeof` is a reserved keyword.
7591 * Crates may be imported by URL with `extern mod foo = "url";`.
7592 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
7593 * Static vectors can be initialized with repeating elements,
7594 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
7595 * Static structs can be initialized with functional record update,
7596 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
7597 * `cfg!` can be used to conditionally execute code based on the crate
7598 configuration, similarly to `#[cfg(...)]`.
7599 * The `unnecessary_qualification` lint detects unneeded module
7600 prefixes (default: allow).
7601 * Arithmetic operations have been implemented on the SIMD types in
7602 `std::unstable::simd`.
7603 * Exchange allocation headers were removed, reducing memory usage.
7604 * `format!` implements a completely new, extensible, and higher-performance
7605 string formatting system. It will replace `fmt!`.
7606 * `print!` and `println!` write formatted strings (using the `format!`
7607 extension) to stdout.
7608 * `write!` and `writeln!` write formatted strings (using the `format!`
7609 extension) to the new Writers in `std::rt::io`.
7610 * The library section in which a function or static is placed may
7611 be specified with `#[link_section = "..."]`.
7612 * The `proto!` syntax extension for defining bounded message protocols
7614 * `macro_rules!` is hygienic for `let` declarations.
7615 * The `#[export_name]` attribute specifies the name of a symbol.
7616 * `unreachable!` can be used to indicate unreachable code, and fails
7620 * std: Transitioned to the new runtime, written in Rust.
7621 * std: Added an experimental I/O library, `rt::io`, based on the new
7623 * std: A new generic `range` function was added to the prelude, replacing
7624 `uint::range` and friends.
7625 * std: `range_rev` no longer exists. Since range is an iterator it can be
7626 reversed with `range(lo, hi).invert()`.
7627 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
7628 renamed to `unwrap_or`.
7629 * std: The `iterator` module was renamed to `iter`.
7630 * std: Integral types now support the `checked_add`, `checked_sub`, and
7631 `checked_mul` operations for detecting overflow.
7632 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
7634 * std: Methods are standardizing on conventions for casting methods:
7635 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
7637 * std: The `CString` type in `c_str` provides new ways to convert to and
7639 * std: `DoubleEndedIterator` can yield elements in two directions.
7640 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
7642 * std: `str::from_bytes` renamed to `str::from_utf8`.
7643 * std: `pop_opt` and `shift_opt` methods added to vectors.
7644 * std: The task-local data interface no longer uses @, and keys are
7645 no longer function pointers.
7646 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
7647 * std: Added `SharedPort` to `comm`.
7648 * std: `Eq` has a default method for `ne`; only `eq` is required
7650 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
7651 is required in implementations.
7652 * std: `is_utf8` performance is improved, impacting many string functions.
7653 * std: `os::MemoryMap` provides cross-platform mmap.
7654 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
7655 are not 'in-bounds' are considered undefined.
7656 * std: Many freestanding functions in `vec` removed in favor of methods.
7657 * std: Many freestanding functions on scalar types removed in favor of
7659 * std: Many options to task builders were removed since they don't make
7660 sense in the new scheduler design.
7661 * std: More containers implement `FromIterator` so can be created by the
7663 * std: More complete atomic types in `unstable::atomics`.
7664 * std: `comm::PortSet` removed.
7665 * std: Mutating methods in the `Set` and `Map` traits have been moved into
7666 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
7667 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
7668 default implementations.
7669 * std: Various `from_str` functions were removed in favor of a generic
7670 `from_str` which is available in the prelude.
7671 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
7672 * extra: `dlist`, the doubly-linked list was modernized.
7673 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
7674 * extra: Added `glob` module, replacing `std::os::glob`.
7675 * extra: `rope` was removed.
7676 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
7677 * extra: `net`, and `timer` were removed. The experimental replacements
7678 are `std::rt::io::net` and `std::rt::io::timer`.
7679 * extra: Iterators implemented for `SmallIntMap`.
7680 * extra: Iterators implemented for `Bitv` and `BitvSet`.
7681 * extra: `SmallIntSet` removed. Use `BitvSet`.
7682 * extra: Performance of JSON parsing greatly improved.
7683 * extra: `semver` updated to SemVer 2.0.0.
7684 * extra: `term` handles more terminals correctly.
7685 * extra: `dbg` module removed.
7686 * extra: `par` module removed.
7687 * extra: `future` was cleaned up, with some method renames.
7688 * extra: Most free functions in `getopts` were converted to methods.
7691 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
7692 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
7693 similarly to gcc's `--march` flag.
7694 * rustc's performance compiling small crates is much better.
7695 * rustpkg has received many improvements.
7696 * rustpkg supports git tags as package IDs.
7697 * rustpkg builds into target-specific directories so it can be used for
7699 * The number of concurrent test tasks is controlled by the environment
7700 variable RUST_TEST_TASKS.
7701 * The test harness can now report metrics for benchmarks.
7702 * All tools have man pages.
7703 * Programs compiled with `--test` now support the `-h` and `--help` flags.
7704 * The runtime uses jemalloc for allocations.
7705 * Segmented stacks are temporarily disabled as part of the transition to
7706 the new runtime. Stack overflows are possible!
7707 * A new documentation backend, rustdoc_ng, is available for use. It is
7708 still invoked through the normal `rustdoc` command.
7711 Version 0.7 (2013-07-03)
7712 =======================
7714 * ~2000 changes, numerous bugfixes
7717 * `impl`s no longer accept a visibility qualifier. Put them on methods
7719 * The borrow checker has been rewritten with flow-sensitivity, fixing
7720 many bugs and inconveniences.
7721 * The `self` parameter no longer implicitly means `&'self self`,
7722 and can be explicitly marked with a lifetime.
7723 * Overloadable compound operators (`+=`, etc.) have been temporarily
7724 removed due to bugs.
7725 * The `for` loop protocol now requires `for`-iterators to return `bool`
7726 so they compose better.
7727 * The `Durable` trait is replaced with the `'static` bounds.
7728 * Trait default methods work more often.
7729 * Structs with the `#[packed]` attribute have byte alignment and
7730 no padding between fields.
7731 * Type parameters bound by `Copy` must now be copied explicitly with
7733 * It is now illegal to move out of a dereferenced unsafe pointer.
7734 * `Option<~T>` is now represented as a nullable pointer.
7735 * `@mut` does dynamic borrow checks correctly.
7736 * The `main` function is only detected at the topmost level of the crate.
7737 The `#[main]` attribute is still valid anywhere.
7738 * Struct fields may no longer be mutable. Use inherited mutability.
7739 * The `#[no_send]` attribute makes a type that would otherwise be
7741 * The `#[no_freeze]` attribute makes a type that would otherwise be
7743 * Unbounded recursion will abort the process after reaching the limit
7744 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
7745 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
7746 are never implicitly copyable.
7747 * `#[static_assert]` makes compile-time assertions about static bools.
7748 * At long last, 'argument modes' no longer exist.
7749 * The rarely used `use mod` statement no longer exists.
7752 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
7754 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
7755 `Rand`, `Zero` and `ToStr` can all be automatically derived with
7757 * The `bytes!` macro returns a vector of bytes for string, u8, char,
7758 and unsuffixed integer literals.
7761 * The `core` crate was renamed to `std`.
7762 * The `std` crate was renamed to `extra`.
7763 * More and improved documentation.
7764 * std: `iterator` module for external iterator objects.
7765 * Many old-style (internal, higher-order function) iterators replaced by
7766 implementations of `Iterator`.
7767 * std: Many old internal vector and string iterators,
7768 incl. `any`, `all`. removed.
7769 * std: The `finalize` method of `Drop` renamed to `drop`.
7770 * std: The `drop` method now takes `&mut self` instead of `&self`.
7771 * std: The prelude no longer re-exports any modules, only types and traits.
7772 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
7773 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
7774 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
7775 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
7776 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
7777 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
7778 * std: Many types implement `Clone`.
7779 * std: `path` type renamed to `Path`.
7780 * std: `mut` module and `Mut` type removed.
7781 * std: Many standalone functions removed in favor of methods and iterators
7782 in `vec`, `str`. In the future methods will also work as functions.
7783 * std: `reinterpret_cast` removed. Use `transmute`.
7784 * std: ascii string handling in `std::ascii`.
7785 * std: `Rand` is implemented for ~/@.
7786 * std: `run` module for spawning processes overhauled.
7787 * std: Various atomic types added to `unstable::atomic`.
7788 * std: Various types implement `Zero`.
7789 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
7790 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
7791 * std: Added `os::mkdir_recursive`.
7792 * std: Added `os::glob` function performs filesystems globs.
7793 * std: `FuzzyEq` renamed to `ApproxEq`.
7794 * std: `Map` now defines `pop` and `swap` methods.
7795 * std: `Cell` constructors converted to static methods.
7796 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
7797 * extra: `flate` module moved from `std` to `extra`.
7798 * extra: `fileinput` module for iterating over a series of files.
7799 * extra: `Complex` number type and `complex` module.
7800 * extra: `Rational` number type and `rational` module.
7801 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
7802 * extra: `term` uses terminfo now, is more correct.
7803 * extra: `arc` functions converted to methods.
7804 * extra: Implementation of fixed output size variations of SHA-2.
7807 * `unused_variable` lint mode for unused variables (default: warn).
7808 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
7810 * `unused_mut` lint mode for identifying unused `mut` qualifiers
7812 * `dead_assignment` lint mode for unread variables (default: warn).
7813 * `unnecessary_allocation` lint mode detects some heap allocations that are
7814 immediately borrowed so could be written without allocating (default: warn).
7815 * `missing_doc` lint mode (default: allow).
7816 * `unreachable_code` lint mode (default: warn).
7817 * The `rusti` command has been rewritten and a number of bugs addressed.
7818 * rustc outputs in color on more terminals.
7819 * rustc accepts a `--link-args` flag to pass arguments to the linker.
7820 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
7821 * Compiling with `-g` will make the binary record information about
7822 dynamic borrowcheck failures for debugging.
7823 * rustdoc has a nicer stylesheet.
7824 * Various improvements to rustdoc.
7825 * Improvements to rustpkg (see the detailed release notes).
7828 Version 0.6 (2013-04-03)
7829 ========================
7831 * ~2100 changes, numerous bugfixes
7834 * The self type parameter in traits is now spelled `Self`
7835 * The `self` parameter in trait and impl methods must now be explicitly
7836 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
7837 * Static methods no longer require the `static` keyword and instead
7838 are distinguished by the lack of a `self` parameter
7839 * Replaced the `Durable` trait with the `'static` lifetime
7840 * The old closure type syntax with the trailing sigil has been
7841 removed in favor of the more consistent leading sigil
7842 * `super` is a keyword, and may be prefixed to paths
7843 * Trait bounds are separated with `+` instead of whitespace
7844 * Traits are implemented with `impl Trait for Type`
7845 instead of `impl Type: Trait`
7846 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
7847 * The `export` keyword has finally been removed
7848 * The `move` keyword has been removed (see "Semantic changes")
7849 * The interior mutability qualifier on vectors, `[mut T]`, has been
7850 removed. Use `&mut [T]`, etc.
7851 * `mut` is no longer valid in `~mut T`. Use inherited mutability
7852 * `fail` is no longer a keyword. Use `fail!()`
7853 * `assert` is no longer a keyword. Use `assert!()`
7854 * `log` is no longer a keyword. use `debug!`, etc.
7855 * 1-tuples may be represented as `(T,)`
7856 * Struct fields may no longer be `mut`. Use inherited mutability,
7857 `@mut T`, `core::mut` or `core::cell`
7858 * `extern mod { ... }` is no longer valid syntax for foreign
7859 function modules. Use extern blocks: `extern { ... }`
7860 * Newtype enums removed. Use tuple-structs.
7861 * Trait implementations no longer support visibility modifiers
7862 * Pattern matching over vectors improved and expanded
7863 * `const` renamed to `static` to correspond to lifetime name,
7864 and make room for future `static mut` unsafe mutable globals.
7865 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
7866 * `Clone` implementations can be automatically generated with
7867 `#[deriving(Clone)]`
7868 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
7869 instead of `foo as Bar`.
7870 * Fixed length vector types are now written as `[int, .. 3]`
7871 instead of `[int * 3]`.
7872 * Fixed length vector types can express the length as a constant
7873 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
7876 * Types with owned pointers or custom destructors move by default,
7877 eliminating the `move` keyword
7878 * All foreign functions are considered unsafe
7879 * &mut is now unaliasable
7880 * Writes to borrowed @mut pointers are prevented dynamically
7882 * The name of the main function can be customized using #[main]
7883 * The default type of an inferred closure is &fn instead of @fn
7884 * `use` statements may no longer be "chained" - they cannot import
7885 identifiers imported by previous `use` statements
7886 * `use` statements are crate relative, importing from the "top"
7887 of the crate by default. Paths may be prefixed with `super::`
7888 or `self::` to change the search behavior.
7889 * Method visibility is inherited from the implementation declaration
7890 * Structural records have been removed
7891 * Many more types can be used in static items, including enums
7892 'static-lifetime pointers and vectors
7893 * Pattern matching over vectors improved and expanded
7894 * Typechecking of closure types has been overhauled to
7895 improve inference and eliminate unsoundness
7896 * Macros leave scope at the end of modules, unless that module is
7897 tagged with #[macro_escape]
7900 * Added big integers to `std::bigint`
7901 * Removed `core::oldcomm` module
7902 * Added pipe-based `core::comm` module
7903 * Numeric traits have been reorganized under `core::num`
7904 * `vec::slice` finally returns a slice
7905 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7906 * Containers reorganized around traits in `core::container`
7907 * `core::dvec` removed, `~[T]` is a drop-in replacement
7908 * `core::send_map` renamed to `core::hashmap`
7909 * `std::map` removed; replaced with `core::hashmap`
7910 * `std::treemap` reimplemented as an owned balanced tree
7911 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7912 * `core::trie` added as a fast ordered map for integer keys
7913 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7914 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7915 overload the comparison operators, whereas `TotalOrd` is used
7916 by certain container types
7919 * Replaced the 'cargo' package manager with 'rustpkg'
7920 * Added all-purpose 'rust' tool
7921 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7922 * rustc now *attempts* to offer spelling suggestions
7923 * Improved support for ARM and Android
7924 * Preliminary MIPS backend
7925 * Improved foreign function ABI implementation for x86, x86_64
7926 * Various memory usage improvements
7927 * Rust code may be embedded in foreign code under limited circumstances
7928 * Inline assembler supported by new asm!() syntax extension.
7931 Version 0.5 (2012-12-21)
7932 ===========================
7934 * ~900 changes, numerous bugfixes
7937 * Removed `<-` move operator
7938 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7939 * Removed old fixed length vector syntax - `[T]/N`
7940 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7941 * Macros may now expand to items and statements
7942 * `a.b()` is always parsed as a method call, never as a field projection
7943 * `Eq` and `IterBytes` implementations can be automatically generated
7944 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7945 * Removed the special crate language for `.rc` files
7946 * Function arguments may consist of any irrefutable pattern
7949 * `&` and `~` pointers may point to objects
7950 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7951 * Enum variants may be structs
7952 * Destructors can be added to all nominal types with the Drop trait
7953 * Structs and nullary enum variants may be constants
7954 * Values that cannot be implicitly copied are now automatically moved
7955 without writing `move` explicitly
7956 * `&T` may now be coerced to `*T`
7957 * Coercions happen in `let` statements as well as function calls
7958 * `use` statements now take crate-relative paths
7959 * The module and type namespaces have been merged so that static
7960 method names can be resolved under the trait in which they are
7963 * Improved support for language features
7964 * Trait inheritance works in many scenarios
7965 * More support for explicit self arguments in methods - `self`, `&self`
7966 `@self`, and `~self` all generally work as expected
7967 * Static methods work in more situations
7968 * Experimental: Traits may declare default methods for the implementations
7972 * New condition handling system in `core::condition`
7973 * Timsort added to `std::sort`
7974 * New priority queue, `std::priority_queue`
7975 * Pipes for serializable types, `std::flatpipes'
7976 * Serialization overhauled to be trait-based
7977 * Expanded `getopts` definitions
7978 * Moved futures to `std`
7979 * More functions are pure now
7980 * `core::comm` renamed to `oldcomm`. Still deprecated
7981 * `rustdoc` and `cargo` are libraries now
7984 * Added a preliminary REPL, `rusti`
7985 * License changed from MIT to dual MIT/APL2
7988 Version 0.4 (2012-10-15)
7989 ==========================
7991 * ~2000 changes, numerous bugfixes
7994 * All keywords are now strict and may not be used as identifiers anywhere
7995 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7996 'of', 'with', 'to', 'class'.
7997 * Classes are replaced with simpler structs
7998 * Explicit method self types
7999 * `ret` became `return` and `alt` became `match`
8000 * `import` is now `use`; `use is now `extern mod`
8001 * `extern mod { ... }` is now `extern { ... }`
8002 * `use mod` is the recommended way to import modules
8003 * `pub` and `priv` replace deprecated export lists
8004 * The syntax of `match` pattern arms now uses fat arrow (=>)
8005 * `main` no longer accepts an args vector; use `os::args` instead
8008 * Trait implementations are now coherent, ala Haskell typeclasses
8009 * Trait methods may be static
8010 * Argument modes are deprecated
8011 * Borrowed pointers are much more mature and recommended for use
8012 * Strings and vectors in the static region are stored in constant memory
8013 * Typestate was removed
8014 * Resolution rewritten to be more reliable
8015 * Support for 'dual-mode' data structures (freezing and thawing)
8018 * Most binary operators can now be overloaded via the traits in
8020 * `std::net::url` for representing URLs
8021 * Sendable hash maps in `core::send_map`
8022 * `core::task' gained a (currently unsafe) task-local storage API
8025 * An efficient new intertask communication primitive called the pipe,
8026 along with a number of higher-level channel types, in `core::pipes`
8027 * `std::arc`, an atomically reference counted, immutable, shared memory
8029 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8030 * Futures are now based on pipes and sendable
8031 * More robust linked task failure
8032 * Improved task builder API
8035 * Improved error reporting
8036 * Preliminary JIT support
8037 * Preliminary work on precise GC
8038 * Extensive architectural improvements to rustc
8039 * Begun a transition away from buggy C++-based reflection (shape) code to
8040 Rust-based (visitor) code
8041 * All hash functions and tables converted to secure, randomized SipHash
8044 Version 0.3 (2012-07-12)
8045 ========================
8047 * ~1900 changes, numerous bugfixes
8049 * New coding conveniences
8050 * Integer-literal suffix inference
8051 * Per-item control over warnings, errors
8052 * #[cfg(windows)] and #[cfg(unix)] attributes
8053 * Documentation comments
8054 * More compact closure syntax
8055 * 'do' expressions for treating higher-order functions as
8057 * *-patterns (wildcard extended to all constructor fields)
8060 * Name resolution pass and exhaustiveness checker rewritten
8061 * Region pointers and borrow checking supersede alias
8063 * Init-ness checking is now provided by a region-based liveness
8064 pass instead of the typestate pass; same for last-use analysis
8065 * Extensive work on region pointers
8067 * Experimental new language features
8068 * Slices and fixed-size, interior-allocated vectors
8069 * #!-comments for lang versioning, shell execution
8070 * Destructors and iface implementation for classes;
8071 type-parameterized classes and class methods
8072 * 'const' type kind for types that can be used to implement
8073 shared-memory concurrency patterns
8077 * Removal of various obsolete features
8078 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8079 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8081 * Constructs: do-while loops ('do' repurposed), fn binding,
8082 resources (replaced by destructors)
8084 * Compiler reorganization
8085 * Syntax-layer of compiler split into separate crate
8086 * Clang (from LLVM project) integrated into build
8087 * Typechecker split into sub-modules
8090 * New time functions
8091 * Extension methods for many built-in types
8092 * Arc: atomic-refcount read-only / exclusive-use shared cells
8093 * Par: parallel map and search routines
8094 * Extensive work on libuv interface
8095 * Much vector code moved to libraries
8096 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8097 #include, #include_str, #include_bin
8100 * Cargo automatically resolves dependencies
8103 Version 0.2 (2012-03-29)
8104 =========================
8106 * >1500 changes, numerous bugfixes
8108 * New docs and doc tooling
8110 * New port: FreeBSD x86_64
8112 * Compilation model enhancements
8113 * Generics now specialized, multiply instantiated
8114 * Functions now inlined across separate crates
8116 * Scheduling, stack and threading fixes
8117 * Noticeably improved message-passing performance
8118 * Explicit schedulers
8122 * Experimental new language features
8123 * Operator overloading
8127 * Various language extensions
8128 * C-callback function types: 'crust fn ...'
8129 * Infinite-loop construct: 'loop { ... }'
8130 * Shorten 'mutable' to 'mut'
8131 * Required mutable-local qualifier: 'let mut ...'
8132 * Basic glob-exporting: 'export foo::*;'
8133 * Alt now exhaustive, 'alt check' for runtime-checked
8134 * Block-function form of 'for' loop, with 'break' and 'ret'.
8137 * AST quasi-quote syntax extension
8138 * Revived libuv interface
8139 * New modules: core::{future, iter}, std::arena
8140 * Merged per-platform std::{os*, fs*} to core::{libc, os}
8141 * Extensive cleanup, regularization in libstd, libcore
8144 Version 0.1 (2012-01-20)
8145 ===============================
8147 * Most language features work, including:
8148 * Unique pointers, unique closures, move semantics
8149 * Interface-constrained generics
8150 * Static interface dispatch
8152 * Multithread task scheduling
8153 * Typestate predicates
8154 * Failure unwinding, destructors
8155 * Pattern matching and destructuring assignment
8156 * Lightweight block-lambda syntax
8157 * Preliminary macro-by-example
8159 * Compiler works with the following configurations:
8160 * Linux: x86 and x86_64 hosts and targets
8161 * macOS: x86 and x86_64 hosts and targets
8162 * Windows: x86 hosts and targets
8164 * Cross compilation / multi-target configuration supported.
8166 * Preliminary API-documentation and package-management tools included.
8170 * Documentation is incomplete.
8172 * Performance is below intended target.
8174 * Standard library APIs are subject to extensive change, reorganization.
8176 * Language-level versioning is not yet operational - future code will