1 Version 1.38.0 (2019-09-26)
2 ==========================
6 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
7 - [The `#[deprecated]` attribute can now be used on macros.][62042]
11 - [Added pipelined compilation support to `rustc`.][62766] This will
12 improve compilation times in some cases. For further information please refer
13 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
14 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
15 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
16 `x86_64-uwp-windows-msvc` targets.][60260]
17 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
18 `armv7-unknown-linux-musleabi` targets.][63107]
19 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
20 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
22 \* Refer to Rust's [platform support page][forge-platform-support] for more
23 information on Rust's tiered platform support.
27 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
28 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
29 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
30 is available at `std::clone::Clone`). This also makes all built-in macros
31 available in `std`/`core` root. e.g. `std::include_bytes!`.
32 - [`str::Chars` now implements `Debug`.][63000]
33 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
34 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
35 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
36 - [Added euclidean remainder and division operations (`div_euclid`,
37 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
38 `overflowing`, and `wrapping` versions are available for all
40 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
42 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
46 - [`<*const T>::cast`]
48 - [`Duration::as_secs_f32`]
49 - [`Duration::as_secs_f64`]
50 - [`Duration::div_f32`]
51 - [`Duration::div_f64`]
52 - [`Duration::from_secs_f32`]
53 - [`Duration::from_secs_f64`]
54 - [`Duration::mul_f32`]
55 - [`Duration::mul_f64`]
60 - [Added pipelined compilation support to `cargo`.][cargo/7143]
61 - [You can now pass the `--features` option multiple times to enable
62 multiple features.][cargo/7084]
66 - [`rustc` will now warn about some incorrect uses of
67 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
71 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
73 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
74 issues][62896] with certain crates such as libc.
76 [60260]: https://github.com/rust-lang/rust/pull/60260/
77 [61457]: https://github.com/rust-lang/rust/pull/61457/
78 [61491]: https://github.com/rust-lang/rust/pull/61491/
79 [61884]: https://github.com/rust-lang/rust/pull/61884/
80 [61953]: https://github.com/rust-lang/rust/pull/61953/
81 [62042]: https://github.com/rust-lang/rust/pull/62042/
82 [62528]: https://github.com/rust-lang/rust/pull/62528/
83 [62583]: https://github.com/rust-lang/rust/pull/62583/
84 [62735]: https://github.com/rust-lang/rust/pull/62735/
85 [62766]: https://github.com/rust-lang/rust/pull/62766/
86 [62784]: https://github.com/rust-lang/rust/pull/62784/
87 [62785]: https://github.com/rust-lang/rust/issues/62785/
88 [62814]: https://github.com/rust-lang/rust/pull/62814/
89 [62896]: https://github.com/rust-lang/rust/issues/62896/
90 [63000]: https://github.com/rust-lang/rust/pull/63000/
91 [63056]: https://github.com/rust-lang/rust/pull/63056/
92 [63107]: https://github.com/rust-lang/rust/pull/63107/
93 [63346]: https://github.com/rust-lang/rust/pull/63346/
94 [63421]: https://github.com/rust-lang/rust/pull/63421/
95 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
96 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
97 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
98 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
99 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
100 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
101 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
102 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
103 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
104 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
105 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
106 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
107 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
108 [forge-platform-support]: https://forge.rust-lang.org/platform-support.html
109 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
111 Version 1.37.0 (2019-08-15)
112 ==========================
116 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
117 [`Box`][62228], or an [array][62235] and unused.
118 - [You can now use the `cfg` and `cfg_attr` attributes on
119 generic parameters.][61547]
120 - [You can now use enum variants through type alias.][61682] e.g. You can
123 type MyOption = Option<u8>;
125 fn increment_or_zero(x: MyOption) -> u8 {
127 MyOption::Some(y) => y + 1,
132 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
134 - [You can now use `#[repr(align(X)]` on enums.][61229]
135 - [The `?` Kleene macro operator is now available in the
136 2015 edition.][60932]
140 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
141 and `-C profile-use` flags.][61268] For more information on how to use profile
142 guided optimization, please refer to the [rustc book][rustc-book-pgo].
143 - [The `rust-lldb` wrapper script should now work again.][61827]
147 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
151 - [`BufReader::buffer`]
152 - [`BufWriter::buffer`]
154 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
155 - [`DoubleEndedIterator::nth_back`]
157 - [`Wrapping::reverse_bits`]
158 - [`i128::reverse_bits`]
159 - [`i16::reverse_bits`]
160 - [`i32::reverse_bits`]
161 - [`i64::reverse_bits`]
162 - [`i8::reverse_bits`]
163 - [`isize::reverse_bits`]
164 - [`slice::copy_within`]
165 - [`u128::reverse_bits`]
166 - [`u16::reverse_bits`]
167 - [`u32::reverse_bits`]
168 - [`u64::reverse_bits`]
169 - [`u8::reverse_bits`]
170 - [`usize::reverse_bits`]
174 - [`Cargo.lock` files are now included by default when publishing executable crates
175 with executables.][cargo/7026]
176 - [You can now specify `default-run="foo"` in `[package]` to specify the
177 default executable to use for `cargo run`.][cargo/7056]
184 - [Using `...` for inclusive range patterns will now warn by default.][61342]
185 Please transition your code to using the `..=` syntax for inclusive
187 - [Using a trait object without the `dyn` will now warn by default.][61203]
188 Please transition your code to use `dyn Trait` for trait objects instead.
190 [62228]: https://github.com/rust-lang/rust/pull/62228/
191 [62235]: https://github.com/rust-lang/rust/pull/62235/
192 [61802]: https://github.com/rust-lang/rust/pull/61802/
193 [61827]: https://github.com/rust-lang/rust/pull/61827/
194 [61547]: https://github.com/rust-lang/rust/pull/61547/
195 [61682]: https://github.com/rust-lang/rust/pull/61682/
196 [61268]: https://github.com/rust-lang/rust/pull/61268/
197 [61342]: https://github.com/rust-lang/rust/pull/61342/
198 [61347]: https://github.com/rust-lang/rust/pull/61347/
199 [61100]: https://github.com/rust-lang/rust/pull/61100/
200 [61203]: https://github.com/rust-lang/rust/pull/61203/
201 [61229]: https://github.com/rust-lang/rust/pull/61229/
202 [60932]: https://github.com/rust-lang/rust/pull/60932/
203 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
204 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
205 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
206 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
207 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
208 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
209 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
210 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
211 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
212 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
213 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
214 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
215 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
216 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
217 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
218 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
219 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
220 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
221 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
222 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
223 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
224 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
225 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
226 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
229 Version 1.36.0 (2019-07-04)
230 ==========================
234 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
235 - [The order of traits in trait objects no longer affects the semantics of that
236 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
237 `dyn fmt::Debug + Send`, where this was previously not the case.
241 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
242 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
243 - [`mem::needs_drop` is now available as a const fn.][60364]
244 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
245 - [`String` now implements `BorrowMut<str>`.][60404]
246 - [`io::Cursor` now implements `Default`.][60234]
247 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
248 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
249 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
250 environment has access to heap memory allocation.
251 - [`String` now implements `From<&String>`.][59825]
252 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
253 return a tuple of each argument when there is multiple arguments.
254 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
259 - [`VecDeque::rotate_left`]
260 - [`VecDeque::rotate_right`]
261 - [`Iterator::copied`]
264 - [`Read::read_vectored`]
265 - [`Write::write_vectored`]
266 - [`str::as_mut_ptr`]
267 - [`mem::MaybeUninit`]
268 - [`pointer::align_offset`]
272 - [`task::RawWakerVTable`]
278 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
279 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
281 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
285 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
292 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
293 longer recommended, and will be deprecated in 1.39.0.
295 [60318]: https://github.com/rust-lang/rust/pull/60318/
296 [60364]: https://github.com/rust-lang/rust/pull/60364/
297 [60370]: https://github.com/rust-lang/rust/pull/60370/
298 [60404]: https://github.com/rust-lang/rust/pull/60404/
299 [60234]: https://github.com/rust-lang/rust/pull/60234/
300 [60244]: https://github.com/rust-lang/rust/pull/60244/
301 [58623]: https://github.com/rust-lang/rust/pull/58623/
302 [59648]: https://github.com/rust-lang/rust/pull/59648/
303 [59675]: https://github.com/rust-lang/rust/pull/59675/
304 [59825]: https://github.com/rust-lang/rust/pull/59825/
305 [59826]: https://github.com/rust-lang/rust/pull/59826/
306 [59445]: https://github.com/rust-lang/rust/pull/59445/
307 [59114]: https://github.com/rust-lang/rust/pull/59114/
308 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
309 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
310 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
311 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
312 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
313 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
314 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
315 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
316 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
317 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
318 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
319 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
320 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
321 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
322 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
323 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
324 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
325 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
326 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
327 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
330 Version 1.35.0 (2019-05-23)
331 ==========================
335 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
336 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
337 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
339 unsafe fn call_unsafe(func: unsafe fn()) {
344 unsafe { call_unsafe(|| {}); }
351 - [Added the `armv6-unknown-freebsd-gnueabihf` and
352 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
353 - [Added the `wasm32-unknown-wasi` target.][59464]
358 - [`Thread` will now show its ID in `Debug` output.][59460]
359 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
360 - [`alloc::System` now implements `Default`.][59451]
361 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
363 - [`char::{ToLowercase, ToUppercase}` now
364 implement `ExactSizeIterator`.][58778]
365 - [All `NonZero` numeric types now implement `FromStr`.][58717]
366 - [Removed the `Read` trait bounds
367 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
368 - [You can now call the `dbg!` macro without any parameters to print the file
369 and line where it is called.][57847]
370 - [In place ASCII case conversions are now up to 4× faster.][59283]
371 e.g. `str::make_ascii_lowercase`
372 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
379 - [`RefCell::replace_with`]
380 - [`RefCell::map_split`]
382 - [`Range::contains`]
383 - [`RangeFrom::contains`]
384 - [`RangeTo::contains`]
385 - [`RangeInclusive::contains`]
386 - [`RangeToInclusive::contains`]
391 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
392 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
397 - [The Rust toolchain is now available natively for musl based distros.][58575]
399 [59460]: https://github.com/rust-lang/rust/pull/59460/
400 [59464]: https://github.com/rust-lang/rust/pull/59464/
401 [59500]: https://github.com/rust-lang/rust/pull/59500/
402 [59512]: https://github.com/rust-lang/rust/pull/59512/
403 [59580]: https://github.com/rust-lang/rust/pull/59580/
404 [59283]: https://github.com/rust-lang/rust/pull/59283/
405 [59451]: https://github.com/rust-lang/rust/pull/59451/
406 [59076]: https://github.com/rust-lang/rust/pull/59076/
407 [58778]: https://github.com/rust-lang/rust/pull/58778/
408 [58717]: https://github.com/rust-lang/rust/pull/58717/
409 [58369]: https://github.com/rust-lang/rust/pull/58369/
410 [58423]: https://github.com/rust-lang/rust/pull/58423/
411 [58080]: https://github.com/rust-lang/rust/pull/58080/
412 [57847]: https://github.com/rust-lang/rust/pull/57847/
413 [58575]: https://github.com/rust-lang/rust/pull/58575
414 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
415 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
416 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
417 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
418 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
419 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
420 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
421 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
422 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
423 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
424 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
425 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
427 Version 1.34.2 (2019-05-14)
428 ===========================
430 * [Destabilize the `Error::type_id` function due to a security
431 vulnerability][60785] ([CVE-2019-12083])
433 [60785]: https://github.com/rust-lang/rust/pull/60785
434 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
436 Version 1.34.1 (2019-04-25)
437 ===========================
439 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
440 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
441 * [Fix Clippy panic when checking some macros][clippy/3805]
443 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
444 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
445 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
447 Version 1.34.0 (2019-04-11)
448 ==========================
452 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
453 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
455 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
456 `#[attr{}]` procedural macros.][57367]
457 - [You can now write `extern crate self as foo;`][57407] to import your
458 crate's root into the extern prelude.
463 - [You can now target `riscv64imac-unknown-none-elf` and
464 `riscv64gc-unknown-none-elf`.][58406]
465 - [You can now enable linker plugin LTO optimisations with
466 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
467 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
469 - [You can now target `powerpc64-unknown-freebsd`.][57809]
474 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
475 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
476 the `Hash` trait to create an iterator.
477 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
478 methods.][58421] Most notably you no longer require the `Ord` trait to create
480 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
481 for all numeric types.][58044]
482 - [Indexing a `str` is now generic over all types that
483 implement `SliceIndex<str>`.][57604]
484 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
485 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
486 produce a warning if their returning type is unused.
487 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
488 `overflowing_pow` are now available for all numeric types.][57873] These are
489 equivalent to methods such as `wrapping_add` for the `pow` operation.
498 * [`atomic::AtomicI16`]
499 * [`atomic::AtomicI32`]
500 * [`atomic::AtomicI64`]
501 * [`atomic::AtomicI8`]
502 * [`atomic::AtomicU16`]
503 * [`atomic::AtomicU32`]
504 * [`atomic::AtomicU64`]
505 * [`atomic::AtomicU8`]
506 * [`convert::Infallible`]
507 * [`convert::TryFrom`]
508 * [`convert::TryInto`]
510 * [`iter::successors`]
511 * [`num::NonZeroI128`]
512 * [`num::NonZeroI16`]
513 * [`num::NonZeroI32`]
514 * [`num::NonZeroI64`]
516 * [`num::NonZeroIsize`]
517 * [`slice::sort_by_cached_key`]
518 * [`str::escape_debug`]
519 * [`str::escape_default`]
520 * [`str::escape_unicode`]
521 * [`str::split_ascii_whitespace`]
524 * [`Instant::checked_add`]
525 * [`Instant::checked_sub`]
526 * [`SystemTime::checked_add`]
527 * [`SystemTime::checked_sub`]
531 - [You can now use alternative registries to crates.io.][cargo/6654]
535 - [You can now use the `?` operator in your documentation tests without manually
536 adding `fn main() -> Result<(), _> {}`.][56470]
540 - [`Command::before_exec` is being replaced by the unsafe method
541 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
542 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
543 can now use `const` functions in `static` variables.
545 [58370]: https://github.com/rust-lang/rust/pull/58370/
546 [58406]: https://github.com/rust-lang/rust/pull/58406/
547 [58421]: https://github.com/rust-lang/rust/pull/58421/
548 [58166]: https://github.com/rust-lang/rust/pull/58166/
549 [58044]: https://github.com/rust-lang/rust/pull/58044/
550 [58057]: https://github.com/rust-lang/rust/pull/58057/
551 [58059]: https://github.com/rust-lang/rust/pull/58059/
552 [57809]: https://github.com/rust-lang/rust/pull/57809/
553 [57873]: https://github.com/rust-lang/rust/pull/57873/
554 [57604]: https://github.com/rust-lang/rust/pull/57604/
555 [57367]: https://github.com/rust-lang/rust/pull/57367/
556 [57407]: https://github.com/rust-lang/rust/pull/57407/
557 [57425]: https://github.com/rust-lang/rust/pull/57425/
558 [57106]: https://github.com/rust-lang/rust/pull/57106/
559 [56470]: https://github.com/rust-lang/rust/pull/56470/
560 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
561 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
562 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
563 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
564 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
565 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
566 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
567 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
568 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
569 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
570 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
571 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
572 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
573 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
574 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
575 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
576 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
577 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
578 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
579 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
580 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
581 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
582 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
583 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
584 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
585 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
586 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
587 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
588 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
589 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
590 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
593 Version 1.33.0 (2019-02-28)
594 ==========================
598 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
599 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
600 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
601 E.g. You can have match statement on a `u8` that covers `0..=255` and
602 you would no longer be required to have a `_ => unreachable!()` case.
603 - [You can now have multiple patterns in `if let` and `while let`
604 expressions.][57532] You can do this with the same syntax as a `match`
614 let state = Creature::Crab("Ferris");
616 if let Creature::Crab(name) | Creature::Person(name) = state {
617 println!("This creature's name is: {}", name);
621 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
622 this feature will by default produce a warning as this behaviour can be
623 unintuitive. E.g. `if let _ = 5 {}`
624 - [You can now use `let` bindings, assignments, expression statements,
625 and irrefutable pattern destructuring in const functions.][57175]
626 - [You can now call unsafe const functions.][57067] E.g.
628 const unsafe fn foo() -> i32 { 5 }
629 const fn bar() -> i32 {
633 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
634 E.g. `#[cfg_attr(all(), must_use, optimize)]`
635 - [You can now specify a specific alignment with the `#[repr(packed)]`
636 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
637 with an alignment of 2 bytes and a size of 6 bytes.
638 - [You can now import an item from a module as an `_`.][56303] This allows you to
639 import a trait's impls, and not have the name in the namespace. E.g.
641 use std::io::Read as _;
643 // Allowed as there is only one `Read` in the module.
646 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
650 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
651 command line argument.][56351]
652 - [The minimum required LLVM version has been bumped to 6.0.][56642]
653 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
654 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
655 tier 2 support.][57130] Visit the [platform support][platform-support] page for
656 information on Rust's platform support.
657 - [Added support for the `thumbv7neon-linux-androideabi` and
658 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
659 - [Added support for the `x86_64-unknown-uefi` target.][56769]
663 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
664 functions for all numeric types.][57566]
665 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
666 are now `const` functions for all numeric types.][57105]
667 - [The methods `is_positive` and `is_negative` are now `const` functions for
668 all signed numeric types.][57105]
669 - [The `get` method for all `NonZero` types is now `const`.][57167]
670 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
671 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
672 numeric types.][57234]
673 - [`Ipv4Addr::new` is now a `const` function][57234]
677 - [`unix::FileExt::read_exact_at`]
678 - [`unix::FileExt::write_all_at`]
679 - [`Option::transpose`]
680 - [`Result::transpose`]
681 - [`convert::identity`]
684 - [`marker::PhantomPinned`]
685 - [`Vec::resize_with`]
686 - [`VecDeque::resize_with`]
687 - [`Duration::as_millis`]
688 - [`Duration::as_micros`]
689 - [`Duration::as_nanos`]
694 - [You can now publish crates that require a feature flag to compile with
695 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
696 - [Cargo should now rebuild a crate if a file was modified during the initial
701 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
702 are now deprecated in the standard library, and their usage will now produce a warning.
703 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
705 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
707 - [Libtest no longer creates a new thread for each test when
708 `--test-threads=1`. It also runs the tests in deterministic order][56243]
710 [55982]: https://github.com/rust-lang/rust/pull/55982/
711 [56243]: https://github.com/rust-lang/rust/pull/56243
712 [56303]: https://github.com/rust-lang/rust/pull/56303/
713 [56351]: https://github.com/rust-lang/rust/pull/56351/
714 [56362]: https://github.com/rust-lang/rust/pull/56362
715 [56642]: https://github.com/rust-lang/rust/pull/56642/
716 [56769]: https://github.com/rust-lang/rust/pull/56769/
717 [56805]: https://github.com/rust-lang/rust/pull/56805
718 [56947]: https://github.com/rust-lang/rust/pull/56947/
719 [57049]: https://github.com/rust-lang/rust/pull/57049/
720 [57067]: https://github.com/rust-lang/rust/pull/57067/
721 [57105]: https://github.com/rust-lang/rust/pull/57105
722 [57130]: https://github.com/rust-lang/rust/pull/57130/
723 [57167]: https://github.com/rust-lang/rust/pull/57167/
724 [57175]: https://github.com/rust-lang/rust/pull/57175/
725 [57234]: https://github.com/rust-lang/rust/pull/57234/
726 [57332]: https://github.com/rust-lang/rust/pull/57332/
727 [57465]: https://github.com/rust-lang/rust/pull/57465/
728 [57532]: https://github.com/rust-lang/rust/pull/57532/
729 [57535]: https://github.com/rust-lang/rust/pull/57535/
730 [57566]: https://github.com/rust-lang/rust/pull/57566/
731 [57615]: https://github.com/rust-lang/rust/pull/57615/
732 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
733 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
734 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
735 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
736 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
737 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
738 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
739 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
740 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
741 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
742 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
743 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
744 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
745 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
746 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
747 [platform-support]: https://forge.rust-lang.org/platform-support.html
749 Version 1.32.0 (2019-01-17)
750 ==========================
755 - [You can now use the `?` operator in macro definitions.][56245] The `?`
756 operator allows you to specify zero or one repetitions similar to the `*` and
758 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
759 now always resolve to the item (`enum`, `struct`, etc.) available in the
760 module if present, before resolving to a external crate or an item the prelude.][56759]
763 enum Color { Red, Green, Blue }
769 - [You can now match against `PhantomData<T>` types.][55837]
770 - [You can now match against literals in macros with the `literal`
771 specifier.][56072] This will match against a literal of any type.
772 E.g. `1`, `'A'`, `"Hello World"`
773 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
775 struct Point(i32, i32);
778 pub fn new(x: i32, y: i32) -> Self {
782 pub fn is_origin(&self) -> bool {
790 - [Self can also now be used in type definitions.][56366] E.g.
794 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
797 Cons(T, Box<Self>) // likewise here
800 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
801 a `impl Trait` or `dyn Trait` is returned and unused in the program.
805 - [The default allocator has changed from jemalloc to the default allocator on
806 your system.][55238] The compiler itself on Linux & macOS will still use
807 jemalloc, but programs compiled with it will use the system allocator.
808 - [Added the `aarch64-pc-windows-msvc` target.][55702]
812 - [`PathBuf` now implements `FromStr`.][55148]
813 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
814 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
815 easily debug expressions in your rust program. E.g.
818 let b = dbg!(a * 2) + 1;
819 // ^-- prints: [src/main.rs:4] a * 2 = 4
823 The following APIs are now `const` functions and can be used in a
827 - [`UnsafeCell::get`]
830 - [`ManuallyDrop::new`]
831 - [`ManuallyDrop::into_inner`]
832 - [`RangeInclusive::start`]
833 - [`RangeInclusive::end`]
834 - [`NonNull::as_ptr`]
837 - [`Duration::as_secs`]
838 - [`Duration::subsec_millis`]
839 - [`Duration::subsec_micros`]
840 - [`Duration::subsec_nanos`]
842 - [`Ipv4Addr::is_unspecified`]
844 - [`Ipv6Addr::octets`]
848 - [`i8::to_be_bytes`]
849 - [`i8::to_le_bytes`]
850 - [`i8::to_ne_bytes`]
851 - [`i8::from_be_bytes`]
852 - [`i8::from_le_bytes`]
853 - [`i8::from_ne_bytes`]
854 - [`i16::to_be_bytes`]
855 - [`i16::to_le_bytes`]
856 - [`i16::to_ne_bytes`]
857 - [`i16::from_be_bytes`]
858 - [`i16::from_le_bytes`]
859 - [`i16::from_ne_bytes`]
860 - [`i32::to_be_bytes`]
861 - [`i32::to_le_bytes`]
862 - [`i32::to_ne_bytes`]
863 - [`i32::from_be_bytes`]
864 - [`i32::from_le_bytes`]
865 - [`i32::from_ne_bytes`]
866 - [`i64::to_be_bytes`]
867 - [`i64::to_le_bytes`]
868 - [`i64::to_ne_bytes`]
869 - [`i64::from_be_bytes`]
870 - [`i64::from_le_bytes`]
871 - [`i64::from_ne_bytes`]
872 - [`i128::to_be_bytes`]
873 - [`i128::to_le_bytes`]
874 - [`i128::to_ne_bytes`]
875 - [`i128::from_be_bytes`]
876 - [`i128::from_le_bytes`]
877 - [`i128::from_ne_bytes`]
878 - [`isize::to_be_bytes`]
879 - [`isize::to_le_bytes`]
880 - [`isize::to_ne_bytes`]
881 - [`isize::from_be_bytes`]
882 - [`isize::from_le_bytes`]
883 - [`isize::from_ne_bytes`]
884 - [`u8::to_be_bytes`]
885 - [`u8::to_le_bytes`]
886 - [`u8::to_ne_bytes`]
887 - [`u8::from_be_bytes`]
888 - [`u8::from_le_bytes`]
889 - [`u8::from_ne_bytes`]
890 - [`u16::to_be_bytes`]
891 - [`u16::to_le_bytes`]
892 - [`u16::to_ne_bytes`]
893 - [`u16::from_be_bytes`]
894 - [`u16::from_le_bytes`]
895 - [`u16::from_ne_bytes`]
896 - [`u32::to_be_bytes`]
897 - [`u32::to_le_bytes`]
898 - [`u32::to_ne_bytes`]
899 - [`u32::from_be_bytes`]
900 - [`u32::from_le_bytes`]
901 - [`u32::from_ne_bytes`]
902 - [`u64::to_be_bytes`]
903 - [`u64::to_le_bytes`]
904 - [`u64::to_ne_bytes`]
905 - [`u64::from_be_bytes`]
906 - [`u64::from_le_bytes`]
907 - [`u64::from_ne_bytes`]
908 - [`u128::to_be_bytes`]
909 - [`u128::to_le_bytes`]
910 - [`u128::to_ne_bytes`]
911 - [`u128::from_be_bytes`]
912 - [`u128::from_le_bytes`]
913 - [`u128::from_ne_bytes`]
914 - [`usize::to_be_bytes`]
915 - [`usize::to_le_bytes`]
916 - [`usize::to_ne_bytes`]
917 - [`usize::from_be_bytes`]
918 - [`usize::from_le_bytes`]
919 - [`usize::from_ne_bytes`]
923 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
924 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
928 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
932 - [The argument types for AVX's
933 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
934 been changed from `*const` to `*mut` as the previous implementation
938 [55148]: https://github.com/rust-lang/rust/pull/55148/
939 [55238]: https://github.com/rust-lang/rust/pull/55238/
940 [55280]: https://github.com/rust-lang/rust/pull/55280/
941 [55610]: https://github.com/rust-lang/rust/pull/55610/
942 [55663]: https://github.com/rust-lang/rust/pull/55663/
943 [55702]: https://github.com/rust-lang/rust/pull/55702/
944 [55837]: https://github.com/rust-lang/rust/pull/55837/
945 [55843]: https://github.com/rust-lang/rust/pull/55843/
946 [56072]: https://github.com/rust-lang/rust/pull/56072/
947 [56245]: https://github.com/rust-lang/rust/pull/56245/
948 [56365]: https://github.com/rust-lang/rust/pull/56365/
949 [56366]: https://github.com/rust-lang/rust/pull/56366/
950 [56395]: https://github.com/rust-lang/rust/pull/56395/
951 [56759]: https://github.com/rust-lang/rust/pull/56759/
952 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
953 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
954 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
955 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
956 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
957 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
958 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
959 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
960 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
961 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
962 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
963 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
964 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
965 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
966 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
967 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
968 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
969 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
970 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
971 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
972 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
973 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
974 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
975 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
976 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
977 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
978 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
979 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
980 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
981 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
982 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
983 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
984 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
985 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
986 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
987 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
988 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
989 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
990 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
991 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
992 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
993 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
994 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
995 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
996 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
997 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
998 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
999 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1000 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1001 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1002 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1003 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1004 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1005 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1006 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
1007 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
1008 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
1009 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
1010 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
1011 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
1012 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
1013 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
1014 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
1015 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
1016 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
1017 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
1018 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
1019 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
1020 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
1021 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
1022 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
1023 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
1024 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
1025 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
1026 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
1027 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
1028 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
1029 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
1030 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
1031 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
1032 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
1033 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
1034 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
1035 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
1036 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
1037 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
1038 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
1039 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
1040 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
1041 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
1042 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
1043 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
1044 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
1047 Version 1.31.1 (2018-12-20)
1048 ===========================
1050 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
1051 - [Fix broken go-to-definition in RLS][rls/1171]
1052 - [Fix infinite loop on hover in RLS][rls/1170]
1054 [56562]: https://github.com/rust-lang/rust/pull/56562
1055 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
1056 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
1058 Version 1.31.0 (2018-12-06)
1059 ==========================
1063 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
1064 - [New lifetime elision rules now allow for eliding lifetimes in functions and
1065 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
1066 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
1068 - [You can now define and use `const` functions.][54835] These are currently
1069 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
1070 [language reference][const-reference] for what exactly is available.
1071 - [You can now use tool lints, which allow you to scope lints from external
1072 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
1073 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
1074 a crate, not just in exported functions.][54451]
1075 - [You can now use parentheses in pattern matches.][54497]
1079 - [Updated musl to 1.1.20][54430]
1083 - [You can now convert `num::NonZero*` types to their raw equivalents using the
1084 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
1085 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
1086 into `Option<&mut T>` using the `From` trait.][53218]
1087 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
1092 - [`slice::align_to`]
1093 - [`slice::align_to_mut`]
1094 - [`slice::chunks_exact`]
1095 - [`slice::chunks_exact_mut`]
1096 - [`slice::rchunks`]
1097 - [`slice::rchunks_mut`]
1098 - [`slice::rchunks_exact`]
1099 - [`slice::rchunks_exact_mut`]
1100 - [`Option::replace`]
1104 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
1105 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
1106 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
1108 [52813]: https://github.com/rust-lang/rust/pull/52813/
1109 [53218]: https://github.com/rust-lang/rust/pull/53218/
1110 [53555]: https://github.com/rust-lang/rust/issues/53555/
1111 [54057]: https://github.com/rust-lang/rust/pull/54057/
1112 [54240]: https://github.com/rust-lang/rust/pull/54240/
1113 [54430]: https://github.com/rust-lang/rust/pull/54430/
1114 [54451]: https://github.com/rust-lang/rust/pull/54451/
1115 [54497]: https://github.com/rust-lang/rust/pull/54497/
1116 [54778]: https://github.com/rust-lang/rust/pull/54778/
1117 [54835]: https://github.com/rust-lang/rust/pull/54835/
1118 [54870]: https://github.com/rust-lang/rust/pull/54870/
1119 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
1120 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
1121 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
1122 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
1123 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
1124 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
1125 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1126 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
1127 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1128 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
1129 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
1130 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
1131 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
1132 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
1134 Version 1.30.1 (2018-11-08)
1135 ===========================
1137 - [Fixed overflow ICE in rustdoc][54199]
1138 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
1140 [54199]: https://github.com/rust-lang/rust/pull/54199
1141 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
1143 Version 1.30.0 (2018-10-25)
1144 ==========================
1148 - [Procedural macros are now available.][52081] These kinds of macros allow for
1149 more powerful code generation. There is a [new chapter available][proc-macros]
1150 in the Rust Programming Language book that goes further in depth.
1151 - [You can now use keywords as identifiers using the raw identifiers
1152 syntax (`r#`),][53236] e.g. `let r#for = true;`
1153 - [Using anonymous parameters in traits is now deprecated with a warning and
1154 will be a hard error in the 2018 edition.][53272]
1155 - [You can now use `crate` in paths.][54404] This allows you to refer to the
1156 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
1157 - [Using a external crate no longer requires being prefixed with `::`.][54404]
1158 Previously, using a external crate in a module without a use statement
1159 required `let json = ::serde_json::from_str(foo);` but can now be written
1160 as `let json = serde_json::from_str(foo);`.
1161 - [You can now apply the `#[used]` attribute to static items to prevent the
1162 compiler from optimising them away, even if they appear to be unused,][51363]
1163 e.g. `#[used] static FOO: u32 = 1;`
1164 - [You can now import and reexport macros from other crates with the `use`
1165 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
1166 the root module of the crate. If your macro relies on calling other local
1167 macros, it is recommended to export with the
1168 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
1170 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
1171 using the `vis` specifier.][53370]
1172 - [Non-macro attributes now allow all forms of literals, not just
1173 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
1174 write `#[attr(true)]`.
1175 - [You can now specify a function to handle a panic in the Rust runtime with the
1176 `#[panic_handler]` attribute.][51366]
1180 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
1181 - [Added the `aarch64-unknown-netbsd` target][53165]
1185 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
1189 - [`Ipv4Addr::BROADCAST`]
1190 - [`Ipv4Addr::LOCALHOST`]
1191 - [`Ipv4Addr::UNSPECIFIED`]
1192 - [`Ipv6Addr::LOCALHOST`]
1193 - [`Ipv6Addr::UNSPECIFIED`]
1194 - [`Iterator::find_map`]
1196 The following methods are replacement methods for `trim_left`, `trim_right`,
1197 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
1199 - [`str::trim_end_matches`]
1201 - [`str::trim_start_matches`]
1202 - [`str::trim_start`]
1206 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
1207 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
1208 equivalent to calling `rustdoc --error-format=json`.
1209 - [Cargo will now provide a progress bar for builds.][cargo/5995]
1213 - [`rustdoc` allows you to specify what edition to treat your code as with the
1214 `--edition` option.][54057]
1215 - [`rustdoc` now has the `--color` (specify whether to output color) and
1216 `--error-format` (specify error format, e.g. `json`) options.][53003]
1217 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
1218 debug symbols.][53774]
1219 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
1220 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
1222 [50911]: https://github.com/rust-lang/rust/pull/50911/
1223 [51363]: https://github.com/rust-lang/rust/pull/51363/
1224 [51366]: https://github.com/rust-lang/rust/pull/51366/
1225 [52081]: https://github.com/rust-lang/rust/pull/52081/
1226 [53003]: https://github.com/rust-lang/rust/pull/53003/
1227 [53033]: https://github.com/rust-lang/rust/pull/53033/
1228 [53044]: https://github.com/rust-lang/rust/pull/53044/
1229 [53165]: https://github.com/rust-lang/rust/pull/53165/
1230 [53213]: https://github.com/rust-lang/rust/pull/53213/
1231 [53236]: https://github.com/rust-lang/rust/pull/53236/
1232 [53272]: https://github.com/rust-lang/rust/pull/53272/
1233 [53370]: https://github.com/rust-lang/rust/pull/53370/
1234 [53459]: https://github.com/rust-lang/rust/pull/53459/
1235 [53774]: https://github.com/rust-lang/rust/pull/53774/
1236 [53822]: https://github.com/rust-lang/rust/pull/53822/
1237 [54057]: https://github.com/rust-lang/rust/pull/54057/
1238 [54146]: https://github.com/rust-lang/rust/pull/54146/
1239 [54404]: https://github.com/rust-lang/rust/pull/54404/
1240 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
1241 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
1242 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
1243 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
1245 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
1246 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
1247 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
1248 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
1249 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
1250 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
1251 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
1252 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
1253 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
1254 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
1257 Version 1.29.2 (2018-10-11)
1258 ===========================
1260 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
1261 - The `rls-preview` component on the windows-gnu targets has been restored.
1263 [54639]: https://github.com/rust-lang/rust/pull/54639
1266 Version 1.29.1 (2018-09-25)
1267 ===========================
1272 - The standard library's `str::repeat` function contained an out of bounds write
1273 caused by an integer overflow. This has been fixed by deterministically
1274 panicking when an overflow happens.
1276 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
1280 Version 1.29.0 (2018-09-13)
1281 ==========================
1285 - [Bumped minimum LLVM version to 5.0.][51899]
1286 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
1287 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
1291 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
1292 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
1293 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
1294 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
1296 - [`Cell<T>` now allows `T` to be unsized.][50494]
1297 - [`SocketAddr` is now stable on Redox.][52656]
1302 - [`Iterator::flatten`]
1307 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
1308 `--locked` to disable this behavior.
1309 - [`cargo-install` will now allow you to cross compile an install
1310 using `--target`.][cargo/5614]
1311 - [Added the `cargo-fix` subcommand to automatically move project code from
1312 2015 edition to 2018.][cargo/5723]
1313 - [`cargo doc` can now optionally document private types using the
1314 `--document-private-items` flag.][cargo/5543]
1318 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
1319 the specified level to that level.][52354] For example `--cap-lints warn`
1320 will demote `deny` and `forbid` lints to `warn`.
1321 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
1322 fails and `101` if there is a panic.][52197]
1323 - [A preview of clippy has been made available through rustup.][51122]
1324 You can install the preview with `rustup component add clippy-preview`.
1328 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
1329 Use `str::get_unchecked(begin..end)` instead.
1330 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
1331 Consider using the `home_dir` function from
1332 https://crates.io/crates/dirs instead.
1333 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
1334 - [`cfg` attributes and `--cfg` command line flags are now more
1335 strictly validated.][53893]
1337 [53893]: https://github.com/rust-lang/rust/pull/53893/
1338 [52861]: https://github.com/rust-lang/rust/pull/52861/
1339 [52656]: https://github.com/rust-lang/rust/pull/52656/
1340 [52239]: https://github.com/rust-lang/rust/pull/52239/
1341 [52330]: https://github.com/rust-lang/rust/pull/52330/
1342 [52354]: https://github.com/rust-lang/rust/pull/52354/
1343 [52402]: https://github.com/rust-lang/rust/pull/52402/
1344 [52103]: https://github.com/rust-lang/rust/pull/52103/
1345 [52197]: https://github.com/rust-lang/rust/pull/52197/
1346 [51807]: https://github.com/rust-lang/rust/pull/51807/
1347 [51899]: https://github.com/rust-lang/rust/pull/51899/
1348 [51912]: https://github.com/rust-lang/rust/pull/51912/
1349 [51511]: https://github.com/rust-lang/rust/pull/51511/
1350 [51619]: https://github.com/rust-lang/rust/pull/51619/
1351 [51656]: https://github.com/rust-lang/rust/pull/51656/
1352 [51178]: https://github.com/rust-lang/rust/pull/51178/
1353 [51122]: https://github.com/rust-lang/rust/pull/51122
1354 [50494]: https://github.com/rust-lang/rust/pull/50494/
1355 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
1356 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
1357 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
1358 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
1359 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
1360 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
1361 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
1364 Version 1.28.0 (2018-08-02)
1365 ===========================
1369 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
1370 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
1371 the inner type across Foreign Function Interface (FFI) boundaries.
1372 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
1373 and can now be used as identifiers.][51196]
1374 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
1375 stable.][51241] This will allow users to specify a global allocator for
1377 - [Unit test functions marked with the `#[test]` attribute can now return
1378 `Result<(), E: Debug>` in addition to `()`.][51298]
1379 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
1380 allows macros to easily target lifetimes.
1384 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
1385 prioritise making smaller binary sizes. `z` is the same as `s` with the
1386 exception that it does not vectorise loops, which typically results in an even
1388 - [The short error format is now stable.][49546] Specified with
1389 `--error-format=short` this option will provide a more compressed output of
1390 rust error messages.
1391 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
1392 - [Reduced the number of allocations in the macro parser.][50855] This can
1393 improve compile times of macro heavy crates on average by 5%.
1397 - [Implemented `Default` for `&mut str`.][51306]
1398 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
1399 - [Implemented `Extend` for `()`.][50234]
1400 - [The `Debug` implementation of `time::Duration` should now be more easily
1401 human readable.][50364] Previously a `Duration` of one second would printed as
1402 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
1403 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
1404 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
1405 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
1406 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
1407 for `PathBuf`.][50170]
1408 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
1409 and `Wrapping<i128>`.][50465]
1410 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
1411 possible.][51050] This can provide up to a 40% speed increase.
1412 - [Improved error messages when using `format!`.][50610]
1416 - [`Iterator::step_by`]
1417 - [`Path::ancestors`]
1418 - [`SystemTime::UNIX_EPOCH`]
1419 - [`alloc::GlobalAlloc`]
1421 - [`alloc::LayoutErr`]
1424 - [`alloc::alloc_zeroed`]
1425 - [`alloc::dealloc`]
1426 - [`alloc::realloc`]
1427 - [`alloc::handle_alloc_error`]
1428 - [`btree_map::Entry::or_default`]
1429 - [`fmt::Alignment`]
1430 - [`hash_map::Entry::or_default`]
1431 - [`iter::repeat_with`]
1432 - [`num::NonZeroUsize`]
1433 - [`num::NonZeroU128`]
1434 - [`num::NonZeroU16`]
1435 - [`num::NonZeroU32`]
1436 - [`num::NonZeroU64`]
1437 - [`num::NonZeroU8`]
1438 - [`ops::RangeBounds`]
1439 - [`slice::SliceIndex`]
1440 - [`slice::from_mut`]
1441 - [`slice::from_ref`]
1442 - [`{Any + Send + Sync}::downcast_mut`]
1443 - [`{Any + Send + Sync}::downcast_ref`]
1444 - [`{Any + Send + Sync}::is`]
1448 - [Cargo will now no longer allow you to publish crates with build scripts that
1449 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
1450 considered to be immutable.
1454 - [The `suggestion_applicability` field in `rustc`'s json output is now
1455 stable.][50486] This will allow dev tools to check whether a code suggestion
1456 would apply to them.
1460 - [Rust will consider trait objects with duplicated constraints to be the same
1461 type as without the duplicated constraint.][51276] For example the below code will
1462 now fail to compile.
1467 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
1470 impl Trait + Send + Send {
1471 fn test(&self) { println!("two"); }
1475 [49546]: https://github.com/rust-lang/rust/pull/49546/
1476 [50143]: https://github.com/rust-lang/rust/pull/50143/
1477 [50170]: https://github.com/rust-lang/rust/pull/50170/
1478 [50234]: https://github.com/rust-lang/rust/pull/50234/
1479 [50265]: https://github.com/rust-lang/rust/pull/50265/
1480 [50364]: https://github.com/rust-lang/rust/pull/50364/
1481 [50385]: https://github.com/rust-lang/rust/pull/50385/
1482 [50465]: https://github.com/rust-lang/rust/pull/50465/
1483 [50486]: https://github.com/rust-lang/rust/pull/50486/
1484 [50554]: https://github.com/rust-lang/rust/pull/50554/
1485 [50610]: https://github.com/rust-lang/rust/pull/50610/
1486 [50855]: https://github.com/rust-lang/rust/pull/50855/
1487 [51050]: https://github.com/rust-lang/rust/pull/51050/
1488 [51196]: https://github.com/rust-lang/rust/pull/51196/
1489 [51200]: https://github.com/rust-lang/rust/pull/51200/
1490 [51241]: https://github.com/rust-lang/rust/pull/51241/
1491 [51276]: https://github.com/rust-lang/rust/pull/51276/
1492 [51298]: https://github.com/rust-lang/rust/pull/51298/
1493 [51306]: https://github.com/rust-lang/rust/pull/51306/
1494 [51562]: https://github.com/rust-lang/rust/pull/51562/
1495 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
1496 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
1497 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
1498 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
1499 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
1500 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
1501 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
1502 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
1503 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
1504 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
1505 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
1506 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
1507 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
1508 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
1509 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
1510 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
1511 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
1512 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
1513 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
1514 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
1515 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
1516 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
1517 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
1518 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
1519 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
1520 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
1521 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
1522 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
1523 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
1524 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
1526 Version 1.27.2 (2018-07-20)
1527 ===========================
1532 - The borrow checker was fixed to avoid potential unsoundness when using
1533 match ergonomics: [#52213][52213].
1535 [52213]: https://github.com/rust-lang/rust/issues/52213
1537 Version 1.27.1 (2018-07-10)
1538 ===========================
1543 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
1544 when running, which enabled executing code as some other user on a
1545 given machine. This release fixes that vulnerability; you can read
1546 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
1548 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
1553 - The borrow checker was fixed to avoid an additional potential unsoundness when using
1554 match ergonomics: [#51415][51415], [#49534][49534].
1556 [51415]: https://github.com/rust-lang/rust/issues/51415
1557 [49534]: https://github.com/rust-lang/rust/issues/49534
1558 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
1559 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
1561 Version 1.27.0 (2018-06-21)
1562 ==========================
1566 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
1567 be used as an identifier.
1568 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
1569 bare `Trait` syntax, and should make it clearer when being used in tandem with
1570 `impl Trait` because it is equivalent to the following syntax:
1571 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
1572 `Box<Trait> == Box<dyn Trait>`.
1573 - [Attributes on generic parameters such as types and lifetimes are
1574 now stable.][48851] e.g.
1575 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
1576 - [The `#[must_use]` attribute can now also be used on functions as well as
1577 types.][48925] It provides a lint that by default warns users when the
1578 value returned by a function has not been used.
1582 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
1586 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
1587 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
1588 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
1589 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
1590 the `cfg` attribute.
1591 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
1592 std are now available in core.][49896]
1593 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
1595 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
1596 that the operation isn't done in place.
1597 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
1598 the `#[must_use]` attribute][49533] to warn about unused potentially
1599 expensive allocations.
1603 - [`DoubleEndedIterator::rfind`]
1604 - [`DoubleEndedIterator::rfold`]
1605 - [`DoubleEndedIterator::try_rfold`]
1606 - [`Duration::from_micros`]
1607 - [`Duration::from_nanos`]
1608 - [`Duration::subsec_micros`]
1609 - [`Duration::subsec_millis`]
1610 - [`HashMap::remove_entry`]
1611 - [`Iterator::try_fold`]
1612 - [`Iterator::try_for_each`]
1614 - [`Option::filter`]
1615 - [`String::replace_range`]
1616 - [`Take::set_limit`]
1617 - [`hint::unreachable_unchecked`]
1618 - [`os::unix::process::parent_id`]
1619 - [`ptr::swap_nonoverlapping`]
1620 - [`slice::rsplit_mut`]
1622 - [`slice::swap_with_slice`]
1626 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
1627 `readme`, and `repository` fields.][cargo/5386]
1628 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
1629 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
1630 a different directory than `target` for placing compilation artifacts.
1631 - [Cargo will be adding automatic target inference for binaries, benchmarks,
1632 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
1633 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
1634 where cargo would infer a binary, Cargo will produce a warning. You can
1635 disable this feature ahead of time by setting any of the following to false:
1636 `autobins`, `autobenches`, `autoexamples`, `autotests`.
1637 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
1638 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
1642 - [Added “The Rustc book” into the official documentation.][49707]
1643 [“The Rustc book”] documents and teaches how to use the rustc compiler.
1644 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
1648 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
1649 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
1650 compile, `"".is_empty()` will still compile.
1651 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
1652 will only print the inner type.][48553] E.g.
1653 `print!("{:?}", AtomicBool::new(true))` will print `true`,
1654 not `AtomicBool(true)`.
1655 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
1656 could enter higher numbers but they were not supported by LLVM. Up to 512MB
1657 alignment should cover all use cases.
1658 - The `.description()` method on the `std::error::Error` trait
1659 [has been soft-deprecated][50163]. It is no longer required to implement it.
1661 [48553]: https://github.com/rust-lang/rust/pull/48553/
1662 [48851]: https://github.com/rust-lang/rust/pull/48851/
1663 [48925]: https://github.com/rust-lang/rust/pull/48925/
1664 [49533]: https://github.com/rust-lang/rust/pull/49533/
1665 [49623]: https://github.com/rust-lang/rust/pull/49623/
1666 [49630]: https://github.com/rust-lang/rust/pull/49630/
1667 [49664]: https://github.com/rust-lang/rust/pull/49664/
1668 [49699]: https://github.com/rust-lang/rust/pull/49699/
1669 [49707]: https://github.com/rust-lang/rust/pull/49707/
1670 [49719]: https://github.com/rust-lang/rust/pull/49719/
1671 [49896]: https://github.com/rust-lang/rust/pull/49896/
1672 [49968]: https://github.com/rust-lang/rust/pull/49968/
1673 [50163]: https://github.com/rust-lang/rust/pull/50163
1674 [50177]: https://github.com/rust-lang/rust/pull/50177/
1675 [50378]: https://github.com/rust-lang/rust/pull/50378/
1676 [50398]: https://github.com/rust-lang/rust/pull/50398/
1677 [50423]: https://github.com/rust-lang/rust/pull/50423/
1678 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
1679 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
1680 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
1681 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
1682 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
1683 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
1684 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
1685 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
1686 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
1687 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
1688 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
1689 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1690 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1691 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
1692 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
1693 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
1694 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
1695 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
1696 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
1697 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
1698 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
1699 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
1700 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1701 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
1702 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
1703 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
1704 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
1705 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
1706 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
1707 [“The Rustc book”]: https://doc.rust-lang.org/rustc
1710 Version 1.26.2 (2018-06-05)
1711 ==========================
1716 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
1718 [51117]: https://github.com/rust-lang/rust/issues/51117
1721 Version 1.26.1 (2018-05-29)
1722 ==========================
1727 - [RLS now works on Windows.][50646]
1728 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
1734 - [`fn main() -> impl Trait` no longer works for non-Termination
1736 This reverts an accidental stabilization.
1737 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
1738 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
1740 [50646]: https://github.com/rust-lang/rust/issues/50646
1741 [50656]: https://github.com/rust-lang/rust/pull/50656
1742 [50812]: https://github.com/rust-lang/rust/pull/50812
1743 [50950]: https://github.com/rust-lang/rust/issues/50950
1744 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
1746 Version 1.26.0 (2018-05-10)
1747 ==========================
1751 - [Closures now implement `Copy` and/or `Clone` if all captured variables
1752 implement either or both traits.][49299]
1753 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
1754 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
1755 lifetime can be elided.][49458]
1756 - [`impl Trait` is now stable allowing you to have abstract types in returns
1757 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
1758 `fn open(path: impl AsRef<Path>)`.
1759 - [Pattern matching will now automatically apply dereferences.][49394]
1760 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
1761 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
1762 - [A lot of operations are now available in a const context.][46882] E.g. You
1763 can now index into constant arrays, reference and dereference into constants,
1764 and use tuple struct constructors.
1765 - [Fixed entry slice patterns are now stable.][48516] E.g.
1767 let points = [1, 2, 3, 4];
1769 [1, 2, 3, 4] => println!("All points were sequential."),
1770 _ => println!("Not all points were sequential."),
1777 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
1778 - [Fixed exponential projection complexity on nested types.][48296]
1779 This can provide up to a ~12% reduction in compile times for certain crates.
1780 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
1781 to remap path prefixes outputted by the compiler.
1782 - [Added `powerpc-unknown-netbsd` target.][48281]
1786 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1787 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1788 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1789 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1790 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1791 - [`ascii::escape_default` is now available in libcore.][48735]
1792 - [Trailing commas are now supported in std and core macros.][48056]
1793 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1794 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1799 - [`*const T::copy_to_nonoverlapping`]
1800 - [`*const T::copy_to`]
1801 - [`*const T::read_unaligned`]
1802 - [`*const T::read_volatile`]
1803 - [`*const T::read`]
1805 - [`*const T::wrapping_add`]
1806 - [`*const T::wrapping_sub`]
1808 - [`*mut T::copy_to_nonoverlapping`]
1809 - [`*mut T::copy_to`]
1810 - [`*mut T::read_unaligned`]
1811 - [`*mut T::read_volatile`]
1813 - [`*mut T::replace`]
1816 - [`*mut T::wrapping_add`]
1817 - [`*mut T::wrapping_sub`]
1818 - [`*mut T::write_bytes`]
1819 - [`*mut T::write_unaligned`]
1820 - [`*mut T::write_volatile`]
1823 - [`FromUtf8Error::as_bytes`]
1824 - [`LocalKey::try_with`]
1825 - [`Option::cloned`]
1826 - [`btree_map::Entry::and_modify`]
1827 - [`fs::read_to_string`]
1830 - [`hash_map::Entry::and_modify`]
1831 - [`iter::FusedIterator`]
1832 - [`ops::RangeInclusive`]
1833 - [`ops::RangeToInclusive`]
1835 - [`slice::rotate_left`]
1836 - [`slice::rotate_right`]
1837 - [`String::retain`]
1842 - [Cargo will now output path to custom commands when `-v` is
1843 passed with `--list`][cargo/5041]
1844 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1848 - [The second edition of "The Rust Programming Language" book is now recommended
1849 over the first.][48404]
1854 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1855 syntax is now invalid.
1857 use std::ops::Fn as dyn;
1858 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1860 - [The result of dereferences are no longer promoted to `'static`.][47408]
1864 const PAIR: &(i32, i32) = &(0, 1);
1865 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1868 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1869 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1871 - [Removed hoedown from rustdoc.][48274]
1872 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1874 [46882]: https://github.com/rust-lang/rust/pull/46882
1875 [47379]: https://github.com/rust-lang/rust/pull/47379
1876 [47408]: https://github.com/rust-lang/rust/pull/47408
1877 [47813]: https://github.com/rust-lang/rust/pull/47813
1878 [48056]: https://github.com/rust-lang/rust/pull/48056
1879 [48125]: https://github.com/rust-lang/rust/pull/48125
1880 [48166]: https://github.com/rust-lang/rust/pull/48166
1881 [48235]: https://github.com/rust-lang/rust/pull/48235
1882 [48274]: https://github.com/rust-lang/rust/pull/48274
1883 [48281]: https://github.com/rust-lang/rust/pull/48281
1884 [48296]: https://github.com/rust-lang/rust/pull/48296
1885 [48326]: https://github.com/rust-lang/rust/pull/48326
1886 [48359]: https://github.com/rust-lang/rust/pull/48359
1887 [48404]: https://github.com/rust-lang/rust/pull/48404
1888 [48481]: https://github.com/rust-lang/rust/pull/48481
1889 [48516]: https://github.com/rust-lang/rust/pull/48516
1890 [48628]: https://github.com/rust-lang/rust/pull/48628
1891 [48629]: https://github.com/rust-lang/rust/pull/48629
1892 [48657]: https://github.com/rust-lang/rust/pull/48657
1893 [48735]: https://github.com/rust-lang/rust/pull/48735
1894 [48978]: https://github.com/rust-lang/rust/pull/48978
1895 [49101]: https://github.com/rust-lang/rust/pull/49101
1896 [49109]: https://github.com/rust-lang/rust/pull/49109
1897 [49121]: https://github.com/rust-lang/rust/pull/49121
1898 [49162]: https://github.com/rust-lang/rust/pull/49162
1899 [49184]: https://github.com/rust-lang/rust/pull/49184
1900 [49234]: https://github.com/rust-lang/rust/pull/49234
1901 [49255]: https://github.com/rust-lang/rust/pull/49255
1902 [49299]: https://github.com/rust-lang/rust/pull/49299
1903 [49305]: https://github.com/rust-lang/rust/pull/49305
1904 [49394]: https://github.com/rust-lang/rust/pull/49394
1905 [49458]: https://github.com/rust-lang/rust/pull/49458
1906 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
1907 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
1908 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
1909 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
1910 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
1911 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
1912 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
1913 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
1914 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
1915 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
1916 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
1917 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
1918 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
1919 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
1920 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
1921 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
1922 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
1923 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
1924 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
1925 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
1926 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
1927 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
1928 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
1929 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
1930 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
1931 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
1932 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
1933 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
1934 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
1935 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
1936 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
1937 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
1938 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
1939 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
1940 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
1941 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
1942 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1943 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
1944 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
1945 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
1946 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
1947 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
1950 Version 1.25.0 (2018-03-29)
1951 ==========================
1955 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
1956 - [You can now use nested groups of imports.][47948]
1957 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
1958 - [You can now have `|` at the start of a match arm.][47947] e.g.
1960 enum Foo { A, B, C }
1966 | Foo::B => println!("AB"),
1967 | Foo::C => println!("C"),
1974 - [Upgraded to LLVM 6.][47828]
1975 - [Added `-C lto=val` option.][47521]
1976 - [Added `i586-unknown-linux-musl` target][47282]
1980 - [Impl Send for `process::Command` on Unix.][47760]
1981 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
1982 - [`UnsafeCell::into_inner` is now safe.][47204]
1983 - [Implement libstd for CloudABI.][47268]
1984 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
1985 - [Implement `AsRef<Path>` for Component][46985]
1986 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
1987 - [Moved `Duration` to libcore.][46666]
1991 - [`Location::column`]
1994 The following functions can now be used in a constant expression.
1995 eg. `static MINUTE: Duration = Duration::from_secs(60);`
1996 - [`Duration::new`][47300]
1997 - [`Duration::from_secs`][47300]
1998 - [`Duration::from_millis`][47300]
2002 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2003 - [`cargo new` now defaults to creating a binary crate, instead of a
2004 library crate.][cargo/5029]
2008 - [Rust by example is now shipped with new releases][46196]
2012 - [Deprecated `net::lookup_host`.][47510]
2013 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
2014 - The borrow checker was sometimes incorrectly permitting overlapping borrows
2015 around indexing operations (see [#47349][47349]). This has been fixed (which also
2016 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
2017 - [Removed deprecated unstable attribute `#[simd]`.][47251]
2019 [33903]: https://github.com/rust-lang/rust/pull/33903
2020 [47947]: https://github.com/rust-lang/rust/pull/47947
2021 [47948]: https://github.com/rust-lang/rust/pull/47948
2022 [47760]: https://github.com/rust-lang/rust/pull/47760
2023 [47790]: https://github.com/rust-lang/rust/pull/47790
2024 [47828]: https://github.com/rust-lang/rust/pull/47828
2025 [47398]: https://github.com/rust-lang/rust/pull/47398
2026 [47510]: https://github.com/rust-lang/rust/pull/47510
2027 [47521]: https://github.com/rust-lang/rust/pull/47521
2028 [47204]: https://github.com/rust-lang/rust/pull/47204
2029 [47251]: https://github.com/rust-lang/rust/pull/47251
2030 [47268]: https://github.com/rust-lang/rust/pull/47268
2031 [47282]: https://github.com/rust-lang/rust/pull/47282
2032 [47300]: https://github.com/rust-lang/rust/pull/47300
2033 [47349]: https://github.com/rust-lang/rust/pull/47349
2034 [46931]: https://github.com/rust-lang/rust/pull/46931
2035 [46985]: https://github.com/rust-lang/rust/pull/46985
2036 [47006]: https://github.com/rust-lang/rust/pull/47006
2037 [46830]: https://github.com/rust-lang/rust/pull/46830
2038 [46095]: https://github.com/rust-lang/rust/pull/46095
2039 [46666]: https://github.com/rust-lang/rust/pull/46666
2040 [46196]: https://github.com/rust-lang/rust/pull/46196
2041 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
2042 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
2043 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
2044 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
2045 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
2048 Version 1.24.1 (2018-03-01)
2049 ==========================
2051 - [Do not abort when unwinding through FFI][48251]
2052 - [Emit UTF-16 files for linker arguments on Windows][48318]
2053 - [Make the error index generator work again][48308]
2054 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
2056 [48251]: https://github.com/rust-lang/rust/issues/48251
2057 [48308]: https://github.com/rust-lang/rust/issues/48308
2058 [48318]: https://github.com/rust-lang/rust/issues/48318
2059 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
2062 Version 1.24.0 (2018-02-15)
2063 ==========================
2067 - [External `sysv64` ffi is now available.][46528]
2068 eg. `extern "sysv64" fn foo () {}`
2072 - [rustc now uses 16 codegen units by default for release builds.][46910]
2073 For the fastest builds, utilize `codegen-units=1`.
2074 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
2075 - [Add `aarch64-unknown-openbsd` support][46760]
2079 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
2080 improvement in performance in the majority of cases.
2081 - [`OsStr`'s `Debug` implementation is now lossless and consistent
2082 with Windows.][46798]
2083 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
2084 - [impl `From<bool>` for `AtomicBool`][46293]
2085 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
2086 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
2087 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
2088 - [float::from_bits now just uses transmute.][46012] This provides
2089 some optimisations from LLVM.
2090 - [Copied `AsciiExt` methods onto `char`][46077]
2091 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
2092 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
2093 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
2094 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
2098 - [`RefCell::replace`]
2100 - [`atomic::spin_loop_hint`]
2102 The following functions can now be used in a constant expression.
2103 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
2105 - [`AtomicBool::new`][46287]
2106 - [`AtomicUsize::new`][46287]
2107 - [`AtomicIsize::new`][46287]
2108 - [`AtomicPtr::new`][46287]
2109 - [`Cell::new`][46287]
2110 - [`{integer}::min_value`][46287]
2111 - [`{integer}::max_value`][46287]
2112 - [`mem::size_of`][46287]
2113 - [`mem::align_of`][46287]
2114 - [`ptr::null`][46287]
2115 - [`ptr::null_mut`][46287]
2116 - [`RefCell::new`][46287]
2117 - [`UnsafeCell::new`][46287]
2121 - [Added a `workspace.default-members` config that
2122 overrides implied `--all` in virtual workspaces.][cargo/4743]
2123 - [Enable incremental by default on development builds.][cargo/4817] Also added
2124 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
2125 per-project or global basis respectively.
2132 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
2133 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
2134 in accordance with IETF RFC 4291 §2.2.
2135 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
2136 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
2137 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
2138 - [Leading zeros in tuple struct members is now an error][47084]
2139 - [`column!()` macro is one-based instead of zero-based][46977]
2140 - [`fmt::Arguments` can no longer be shared across threads][45198]
2141 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
2142 - [Cargo sets a different working directory for the compiler][cargo/4788]
2144 [44884]: https://github.com/rust-lang/rust/pull/44884
2145 [45198]: https://github.com/rust-lang/rust/pull/45198
2146 [45506]: https://github.com/rust-lang/rust/pull/45506
2147 [45904]: https://github.com/rust-lang/rust/pull/45904
2148 [45990]: https://github.com/rust-lang/rust/pull/45990
2149 [46012]: https://github.com/rust-lang/rust/pull/46012
2150 [46077]: https://github.com/rust-lang/rust/pull/46077
2151 [46094]: https://github.com/rust-lang/rust/pull/46094
2152 [46284]: https://github.com/rust-lang/rust/pull/46284
2153 [46287]: https://github.com/rust-lang/rust/pull/46287
2154 [46293]: https://github.com/rust-lang/rust/pull/46293
2155 [46528]: https://github.com/rust-lang/rust/pull/46528
2156 [46671]: https://github.com/rust-lang/rust/pull/46671
2157 [46713]: https://github.com/rust-lang/rust/pull/46713
2158 [46735]: https://github.com/rust-lang/rust/pull/46735
2159 [46749]: https://github.com/rust-lang/rust/pull/46749
2160 [46760]: https://github.com/rust-lang/rust/pull/46760
2161 [46798]: https://github.com/rust-lang/rust/pull/46798
2162 [46828]: https://github.com/rust-lang/rust/pull/46828
2163 [46831]: https://github.com/rust-lang/rust/pull/46831
2164 [46833]: https://github.com/rust-lang/rust/pull/46833
2165 [46910]: https://github.com/rust-lang/rust/pull/46910
2166 [46977]: https://github.com/rust-lang/rust/pull/46977
2167 [47018]: https://github.com/rust-lang/rust/pull/47018
2168 [47080]: https://github.com/rust-lang/rust/pull/47080
2169 [47084]: https://github.com/rust-lang/rust/pull/47084
2170 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
2171 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
2172 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
2173 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
2174 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
2175 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
2178 Version 1.23.0 (2018-01-04)
2179 ==========================
2183 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
2184 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
2185 Which should fix some confusing errors in some operations.
2189 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
2190 undefined behavior.][45920]
2191 - [rustc now suggests renaming import if names clash.][45660]
2192 - [Display errors/warnings correctly when there are zero-width or
2193 wide characters.][45711]
2194 - [rustc now avoids unnecessary copies of arguments that are
2195 simple bindings][45380] This should improve memory usage on average by 5-10%.
2196 - [Updated musl used to build musl rustc to 1.1.17][45393]
2200 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
2201 - [Implement Hash for raw pointers to unsized types][45483]
2202 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
2203 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
2204 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
2205 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
2206 and `<*mut T>::as_mut`][44932]
2207 - [Optimized `Thread::{park, unpark}` implementation][45524]
2208 - [Improved `SliceExt::binary_search` performance.][45333]
2209 - [impl `FromIterator<()>` for `()`][45379]
2210 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
2218 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
2219 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
2220 - [Added unit test checking to `cargo check`][cargo/4592]
2221 - [Cargo now lets you install a specific version
2222 using `cargo install --version`][cargo/4637]
2226 - [Releases now ship with the Cargo book documentation.][45692]
2227 - [rustdoc now prints rendering warnings on every run.][45324]
2231 - [Changes have been made to type equality to make it more correct,
2232 in rare cases this could break some code.][45853] [Tracking issue for
2233 further information][45852]
2234 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
2235 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
2236 Android 9, the minimum supported version is Android 14.
2237 - [Bumped the minimum LLVM to 3.9][45326]
2239 [44042]: https://github.com/rust-lang/rust/pull/44042
2240 [44932]: https://github.com/rust-lang/rust/pull/44932
2241 [45267]: https://github.com/rust-lang/rust/pull/45267
2242 [45324]: https://github.com/rust-lang/rust/pull/45324
2243 [45326]: https://github.com/rust-lang/rust/pull/45326
2244 [45333]: https://github.com/rust-lang/rust/pull/45333
2245 [45379]: https://github.com/rust-lang/rust/pull/45379
2246 [45380]: https://github.com/rust-lang/rust/pull/45380
2247 [45393]: https://github.com/rust-lang/rust/pull/45393
2248 [45435]: https://github.com/rust-lang/rust/pull/45435
2249 [45483]: https://github.com/rust-lang/rust/pull/45483
2250 [45524]: https://github.com/rust-lang/rust/pull/45524
2251 [45571]: https://github.com/rust-lang/rust/pull/45571
2252 [45580]: https://github.com/rust-lang/rust/pull/45580
2253 [45610]: https://github.com/rust-lang/rust/pull/45610
2254 [45660]: https://github.com/rust-lang/rust/pull/45660
2255 [45692]: https://github.com/rust-lang/rust/pull/45692
2256 [45711]: https://github.com/rust-lang/rust/pull/45711
2257 [45772]: https://github.com/rust-lang/rust/pull/45772
2258 [45852]: https://github.com/rust-lang/rust/issues/45852
2259 [45853]: https://github.com/rust-lang/rust/pull/45853
2260 [45887]: https://github.com/rust-lang/rust/pull/45887
2261 [45920]: https://github.com/rust-lang/rust/pull/45920
2262 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
2263 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
2264 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
2267 Version 1.22.1 (2017-11-22)
2268 ==========================
2270 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
2272 [46183]: https://github.com/rust-lang/rust/pull/46183
2274 Version 1.22.0 (2017-11-22)
2275 ==========================
2279 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
2280 - [Now accepts underscores in unicode escapes][43716]
2281 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
2282 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
2286 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
2287 - [rustc will no longer inline in codegen units when compiling for debug][45075]
2288 This should decrease compile times for debug builds.
2289 - [strict memory alignment now enabled on ARMv6][45094]
2290 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
2294 - [Allow atomic operations up to 32 bits
2295 on `armv5te_unknown_linux_gnueabi`][44978]
2296 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
2297 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
2298 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
2299 - [Properly detect overflow in `Instant += Duration`.][44220]
2300 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
2301 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
2302 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
2309 - [Cargo will now build multi file examples in subdirectories of the `examples`
2310 folder that have a `main.rs` file.][cargo/4496]
2311 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
2312 the old format will continue to work and can be updated with `cargo update`.
2313 - [Now supports vendoring git repositories][cargo/3992]
2317 - [`libbacktrace` is now available on Apple platforms.][44251]
2318 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
2319 This now lets you specify that a given code example will fail to compile.
2323 - [The minimum Android version that rustc can build for has been bumped
2324 to `4.0` from `2.3`][45656]
2325 - [Allowing `T op= &T` for numeric types has broken some type
2326 inference cases][45480]
2329 [42526]: https://github.com/rust-lang/rust/pull/42526
2330 [43017]: https://github.com/rust-lang/rust/pull/43017
2331 [43716]: https://github.com/rust-lang/rust/pull/43716
2332 [43949]: https://github.com/rust-lang/rust/pull/43949
2333 [44015]: https://github.com/rust-lang/rust/pull/44015
2334 [44220]: https://github.com/rust-lang/rust/pull/44220
2335 [44251]: https://github.com/rust-lang/rust/pull/44251
2336 [44287]: https://github.com/rust-lang/rust/pull/44287
2337 [44303]: https://github.com/rust-lang/rust/pull/44303
2338 [44456]: https://github.com/rust-lang/rust/pull/44456
2339 [44466]: https://github.com/rust-lang/rust/pull/44466
2340 [44895]: https://github.com/rust-lang/rust/pull/44895
2341 [44966]: https://github.com/rust-lang/rust/pull/44966
2342 [44978]: https://github.com/rust-lang/rust/pull/44978
2343 [45041]: https://github.com/rust-lang/rust/pull/45041
2344 [45064]: https://github.com/rust-lang/rust/pull/45064
2345 [45075]: https://github.com/rust-lang/rust/pull/45075
2346 [45094]: https://github.com/rust-lang/rust/pull/45094
2347 [45095]: https://github.com/rust-lang/rust/pull/45095
2348 [45480]: https://github.com/rust-lang/rust/issues/45480
2349 [45656]: https://github.com/rust-lang/rust/pull/45656
2350 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
2351 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
2352 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
2359 Version 1.21.0 (2017-10-12)
2360 ==========================
2364 - [You can now use static references for literals.][43838]
2368 let x: &'static u32 = &0;
2371 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
2374 my_macro!(Vec<i32>::new); // Always worked
2375 my_macro!(Vec::<i32>::new); // Now works
2380 - [Upgraded jemalloc to 4.5.0][43911]
2381 - [Enabled unwinding panics on Redox][43917]
2382 - [Now runs LLVM in parallel during translation phase.][43506]
2383 This should reduce peak memory usage.
2387 - [Generate builtin impls for `Clone` for all arrays and tuples that
2388 are `T: Clone`][43690]
2389 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
2390 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
2391 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
2396 [`std::mem::discriminant`]
2400 - [You can now call `cargo install` with multiple package names][cargo/4216]
2401 - [Cargo commands inside a virtual workspace will now implicitly
2402 pass `--all`][cargo/4335]
2403 - [Added a `[patch]` section to `Cargo.toml` to handle
2404 prepublication dependencies][cargo/4123] [RFC 1969]
2405 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
2406 like patterns][cargo/4270]
2407 - [Added the `--all-targets` option][cargo/4400]
2408 - [Using required dependencies as a feature is now deprecated and emits
2409 a warning][cargo/4364]
2414 - [Cargo docs are moving][43916]
2415 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
2416 - [The rustdoc book is now available][43863]
2417 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
2418 - [Added a preview of RLS has been made available through rustup][44204]
2419 Install with `rustup component add rls-preview`
2420 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
2421 Previously only showed `std::os::unix`.
2425 - [Changes in method matching against higher-ranked types][43880] This may cause
2426 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
2427 - [rustc's JSON error output's byte position start at top of file.][42973]
2428 Was previously relative to the rustc's internal `CodeMap` struct which
2429 required the unstable library `libsyntax` to correctly use.
2430 - [`unused_results` lint no longer ignores booleans][43728]
2432 [42565]: https://github.com/rust-lang/rust/pull/42565
2433 [42973]: https://github.com/rust-lang/rust/pull/42973
2434 [43348]: https://github.com/rust-lang/rust/pull/43348
2435 [43459]: https://github.com/rust-lang/rust/pull/43459
2436 [43506]: https://github.com/rust-lang/rust/pull/43506
2437 [43540]: https://github.com/rust-lang/rust/pull/43540
2438 [43690]: https://github.com/rust-lang/rust/pull/43690
2439 [43728]: https://github.com/rust-lang/rust/pull/43728
2440 [43838]: https://github.com/rust-lang/rust/pull/43838
2441 [43863]: https://github.com/rust-lang/rust/pull/43863
2442 [43880]: https://github.com/rust-lang/rust/pull/43880
2443 [43911]: https://github.com/rust-lang/rust/pull/43911
2444 [43916]: https://github.com/rust-lang/rust/pull/43916
2445 [43917]: https://github.com/rust-lang/rust/pull/43917
2446 [44204]: https://github.com/rust-lang/rust/pull/44204
2447 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
2448 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
2449 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2450 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
2451 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
2452 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
2453 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
2454 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
2455 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
2457 Version 1.20.0 (2017-08-31)
2458 ===========================
2462 - [Associated constants are now stabilised.][42809]
2463 - [A lot of macro bugs are now fixed.][42913]
2468 - [Struct fields are now properly coerced to the expected field type.][42807]
2469 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
2470 `wasm32-experimental-emscripten` target.
2471 - [Changed some of the error messages to be more helpful.][42033]
2472 - [Add support for RELRO(RELocation Read-Only) for platforms that support
2474 - [rustc now reports the total number of errors on compilation failure][43015]
2475 previously this was only the number of errors in the pass that failed.
2476 - [Expansion in rustc has been sped up 29x.][42533]
2477 - [added `msp430-none-elf` target.][43099]
2478 - [rustc will now suggest one-argument enum variant to fix type mismatch when
2480 - [Fixes backtraces on Redox][43228]
2481 - [rustc now identifies different versions of same crate when absolute paths of
2482 different types match in an error message.][42826]
2488 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
2489 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
2491 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
2492 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
2493 - [Impl `Clone` for `DefaultHasher`.][42799]
2494 - [Impl `Sync` for `SyncSender`.][42397]
2495 - [Impl `FromStr` for `char`][42271]
2496 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
2498 - [allow messages in the `unimplemented!()` macro.][42155]
2499 ie. `unimplemented!("Waiting for 1.21 to be stable")`
2500 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
2501 - [Upgrade to Unicode 10.0.0][42999]
2502 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
2503 - [Skip the main thread's manual stack guard on Linux][43072]
2504 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
2505 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
2507 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
2512 - [`CStr::into_c_string`]
2513 - [`CString::as_c_str`]
2514 - [`CString::into_boxed_c_str`]
2515 - [`Chain::get_mut`]
2516 - [`Chain::get_ref`]
2517 - [`Chain::into_inner`]
2518 - [`Option::get_or_insert_with`]
2519 - [`Option::get_or_insert`]
2520 - [`OsStr::into_os_string`]
2521 - [`OsString::into_boxed_os_str`]
2524 - [`Utf8Error::error_len`]
2525 - [`char::EscapeDebug`]
2526 - [`char::escape_debug`]
2527 - [`compile_error!`]
2528 - [`f32::from_bits`]
2530 - [`f64::from_bits`]
2532 - [`mem::ManuallyDrop`]
2533 - [`slice::sort_unstable_by_key`]
2534 - [`slice::sort_unstable_by`]
2535 - [`slice::sort_unstable`]
2536 - [`str::from_boxed_utf8_unchecked`]
2537 - [`str::as_bytes_mut`]
2538 - [`str::as_bytes_mut`]
2539 - [`str::from_utf8_mut`]
2540 - [`str::from_utf8_unchecked_mut`]
2542 - [`str::get_unchecked_mut`]
2543 - [`str::get_unchecked`]
2545 - [`str::into_boxed_bytes`]
2550 - [Cargo API token location moved from `~/.cargo/config` to
2551 `~/.cargo/credentials`.][cargo/3978]
2552 - [Cargo will now build `main.rs` binaries that are in sub-directories of
2553 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
2554 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
2555 - [You can now specify version of a binary when installed through
2556 `cargo install` using `--vers`.][cargo/4229]
2557 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
2558 failure.][cargo/4248]
2559 - [Changed the convention around which file is the crate root.][cargo/4259]
2560 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
2561 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
2566 - [Functions with `'static` in their return types will now not be as usable as
2567 if they were using lifetime parameters instead.][42417]
2568 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
2569 takes the sign of NaN into account where previously didn't.][42430]
2571 [42033]: https://github.com/rust-lang/rust/pull/42033
2572 [42155]: https://github.com/rust-lang/rust/pull/42155
2573 [42271]: https://github.com/rust-lang/rust/pull/42271
2574 [42397]: https://github.com/rust-lang/rust/pull/42397
2575 [42417]: https://github.com/rust-lang/rust/pull/42417
2576 [42430]: https://github.com/rust-lang/rust/pull/42430
2577 [42431]: https://github.com/rust-lang/rust/pull/42431
2578 [42533]: https://github.com/rust-lang/rust/pull/42533
2579 [42571]: https://github.com/rust-lang/rust/pull/42571
2580 [42613]: https://github.com/rust-lang/rust/pull/42613
2581 [42799]: https://github.com/rust-lang/rust/pull/42799
2582 [42807]: https://github.com/rust-lang/rust/pull/42807
2583 [42809]: https://github.com/rust-lang/rust/pull/42809
2584 [42822]: https://github.com/rust-lang/rust/pull/42822
2585 [42826]: https://github.com/rust-lang/rust/pull/42826
2586 [42854]: https://github.com/rust-lang/rust/pull/42854
2587 [42913]: https://github.com/rust-lang/rust/pull/42913
2588 [42999]: https://github.com/rust-lang/rust/pull/42999
2589 [43011]: https://github.com/rust-lang/rust/pull/43011
2590 [43015]: https://github.com/rust-lang/rust/pull/43015
2591 [43072]: https://github.com/rust-lang/rust/pull/43072
2592 [43077]: https://github.com/rust-lang/rust/pull/43077
2593 [43097]: https://github.com/rust-lang/rust/pull/43097
2594 [43099]: https://github.com/rust-lang/rust/pull/43099
2595 [43170]: https://github.com/rust-lang/rust/pull/43170
2596 [43178]: https://github.com/rust-lang/rust/pull/43178
2597 [43185]: https://github.com/rust-lang/rust/pull/43185
2598 [43228]: https://github.com/rust-lang/rust/pull/43228
2599 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
2600 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
2601 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
2602 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
2603 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
2604 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2605 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
2606 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
2607 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
2608 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
2609 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
2610 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
2611 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
2612 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
2613 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
2614 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
2615 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
2616 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
2617 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
2618 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
2619 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
2620 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
2621 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
2622 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
2623 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
2624 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
2625 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
2626 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
2627 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
2628 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
2629 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
2630 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
2631 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
2632 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
2633 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
2634 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
2635 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
2636 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
2637 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
2640 Version 1.19.0 (2017-07-20)
2641 ===========================
2646 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
2647 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
2648 - [Macro recursion limit increased to 1024 from 64.][41676]
2649 - [Added lint for detecting unused macros.][41907]
2650 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
2651 For example: `let x = loop { break 7; };`
2652 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
2653 contain `Copy` types and cannot have a `Drop` implementation.
2654 Example: `union Foo { bar: u8, baz: usize }`
2655 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
2656 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
2661 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
2662 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
2663 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
2664 you should use `--target armv7-linux-androideabi`.
2665 - [Fixed ICE when removing a source file between compilation sessions.][41873]
2666 - [Minor optimisation of string operations.][42037]
2667 - [Compiler error message is now `aborting due to previous error(s)` instead of
2668 `aborting due to N previous errors`][42150] This was previously inaccurate and
2669 would only count certain kinds of errors.
2670 - [The compiler now supports Visual Studio 2017][42225]
2671 - [The compiler is now built against LLVM 4.0.1 by default][42948]
2672 - [Added a lot][42264] of [new error codes][42302]
2673 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
2674 libraries with C Run-time Libraries(CRT) to be statically linked.
2675 - [Fixed various ARM codegen bugs][42740]
2680 - [`String` now implements `FromIterator<Cow<'a, str>>` and
2681 `Extend<Cow<'a, str>>`][41449]
2682 - [`Vec` now implements `From<&mut [T]>`][41530]
2683 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
2684 - [`SplitWhitespace` now implements `Clone`][41659]
2685 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
2687 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
2688 macros, but for printing to stderr.
2693 - [`OsString::shrink_to_fit`]
2696 - [`thread::ThreadId`]
2701 - [Build scripts can now add environment variables to the environment
2702 the crate is being compiled in.
2703 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
2704 - [Subcommands now replace the current process rather than spawning a new
2705 child process][cargo/3970]
2706 - [Workspace members can now accept glob file patterns][cargo/3979]
2707 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
2708 the members in a given workspace.][cargo/3988]
2709 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
2710 - [Target directory path is now in the cargo metadata][cargo/4022]
2711 - [Cargo no longer checks out a local working directory for the
2712 crates.io index][cargo/4026] This should provide smaller file size for the
2713 registry, and improve cloning times, especially on Windows machines.
2714 - [Added an `--exclude` option for excluding certain packages when using the
2715 `--all` option][cargo/4031]
2716 - [Cargo will now automatically retry when receiving a 5xx error
2717 from crates.io][cargo/4032]
2718 - [The `--features` option now accepts multiple comma or space
2719 delimited values.][cargo/4084]
2720 - [Added support for custom target specific runners][cargo/3954]
2725 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
2727 - [Rust will now release XZ compressed packages][rust-installer/57]
2728 - [rustup will now prefer to download rust packages with
2729 XZ compression][rustup/1100] over GZip packages.
2730 - [Added the ability to escape `#` in rust documentation][41785] By adding
2731 additional `#`'s ie. `##` is now `#`
2736 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
2737 - [`-Z` flags are now no longer allowed to be used on the stable
2738 compiler.][41751] This has been a warning for a year previous to this.
2739 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
2740 longer works][42844]. Users should migrate to the built-in `check`
2741 command, which has been available since 1.16.
2742 - [Ending a float literal with `._` is now a hard error.
2743 Example: `42._` .][41946]
2744 - [Any use of a private `extern crate` outside of its module is now a
2745 hard error.][36886] This was previously a warning.
2746 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
2747 relative while the `::` prefix makes a path absolute, but was ignored and the
2748 path was relative regardless.
2749 - [Floating point constants in match patterns is now a hard error][36890]
2750 This was previously a warning.
2751 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
2752 match patterns is now a hard error][36891] This was previously a warning.
2753 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
2755 - [From the pound escape, lines consisting of multiple `#`s are
2757 - [It is an error to re-export private enum variants][42460]. This is
2758 known to break a number of crates that depend on an older version of
2760 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
2761 to use it to find the linker, and the build will fail where it did
2762 not previously][42607]
2764 [36886]: https://github.com/rust-lang/rust/issues/36886
2765 [36888]: https://github.com/rust-lang/rust/issues/36888
2766 [36890]: https://github.com/rust-lang/rust/issues/36890
2767 [36891]: https://github.com/rust-lang/rust/issues/36891
2768 [36892]: https://github.com/rust-lang/rust/issues/36892
2769 [37406]: https://github.com/rust-lang/rust/issues/37406
2770 [39983]: https://github.com/rust-lang/rust/pull/39983
2771 [41145]: https://github.com/rust-lang/rust/pull/41145
2772 [41192]: https://github.com/rust-lang/rust/pull/41192
2773 [41258]: https://github.com/rust-lang/rust/pull/41258
2774 [41370]: https://github.com/rust-lang/rust/pull/41370
2775 [41449]: https://github.com/rust-lang/rust/pull/41449
2776 [41530]: https://github.com/rust-lang/rust/pull/41530
2777 [41624]: https://github.com/rust-lang/rust/pull/41624
2778 [41656]: https://github.com/rust-lang/rust/pull/41656
2779 [41659]: https://github.com/rust-lang/rust/pull/41659
2780 [41676]: https://github.com/rust-lang/rust/pull/41676
2781 [41751]: https://github.com/rust-lang/rust/pull/41751
2782 [41764]: https://github.com/rust-lang/rust/pull/41764
2783 [41785]: https://github.com/rust-lang/rust/pull/41785
2784 [41873]: https://github.com/rust-lang/rust/pull/41873
2785 [41907]: https://github.com/rust-lang/rust/pull/41907
2786 [41946]: https://github.com/rust-lang/rust/pull/41946
2787 [42016]: https://github.com/rust-lang/rust/pull/42016
2788 [42037]: https://github.com/rust-lang/rust/pull/42037
2789 [42068]: https://github.com/rust-lang/rust/pull/42068
2790 [42150]: https://github.com/rust-lang/rust/pull/42150
2791 [42162]: https://github.com/rust-lang/rust/pull/42162
2792 [42225]: https://github.com/rust-lang/rust/pull/42225
2793 [42264]: https://github.com/rust-lang/rust/pull/42264
2794 [42302]: https://github.com/rust-lang/rust/pull/42302
2795 [42460]: https://github.com/rust-lang/rust/issues/42460
2796 [42607]: https://github.com/rust-lang/rust/issues/42607
2797 [42740]: https://github.com/rust-lang/rust/pull/42740
2798 [42844]: https://github.com/rust-lang/rust/issues/42844
2799 [42948]: https://github.com/rust-lang/rust/pull/42948
2800 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2801 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2802 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2803 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2804 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2805 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2806 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2807 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2808 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2809 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2810 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2811 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2812 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2813 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2814 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2815 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2816 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2817 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2818 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2819 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2820 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2821 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2824 Version 1.18.0 (2017-06-08)
2825 ===========================
2830 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2831 make the item visible to just that module tree. Also accepts the keyword
2832 `crate` to make something public to the whole crate but not users of the
2833 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2834 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2835 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2836 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2837 types like `Write + Send`, trailing `+` are now supported in trait objects,
2838 and better error reporting for trait objects starting with `?Sized`.
2839 - [0e+10 is now a valid floating point literal][40589]
2840 - [Now warns if you bind a lifetime parameter to 'static][40734]
2841 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2842 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2843 representation in some cases.][40377]
2848 - [rustc can now emit mir with `--emit mir`][39891]
2849 - [Improved LLVM IR for trivial functions][40367]
2850 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2851 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2852 opportunities found through profiling
2853 - [Improved backtrace formatting when panicking][38165]
2858 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2859 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2860 iteration or reallocation.
2861 - [Simplified HashMap Bucket interface][40561] provides performance
2862 improvements for iterating and cloning.
2863 - [Specialize Vec::from_elem to use calloc][40409]
2864 - [Fixed Race condition in fs::create_dir_all][39799]
2865 - [No longer caching stdio on Windows][40516]
2866 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2867 2.50%~ faster and in one case now 12.50% faster.
2868 - [Optimized `AtomicBool::fetch_nand`][41143]
2873 - [`Child::try_wait`]
2874 - [`HashMap::retain`]
2875 - [`HashSet::retain`]
2877 - [`TcpStream::peek`]
2878 - [`UdpSocket::peek`]
2879 - [`UdpSocket::peek_from`]
2884 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
2885 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
2886 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
2887 - [Added Android build support][cargo/3885]
2888 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
2889 of a certain type, for example `cargo build --bins` will build all
2891 - [Added support for haiku][cargo/3952]
2896 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
2897 - [Added rust-windbg script for better debugging on Windows][39983]
2898 - [Rust now uses the official cross compiler for NetBSD][40612]
2899 - [rustdoc now accepts `#` at the start of files][40828]
2900 - [Fixed jemalloc support for musl][41168]
2905 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
2906 always placed after the sign if it exists and before the digits. With the `#`
2907 flag the zeroes are placed after the prefix and before the digits.
2908 - [Due to the struct field optimisation][40377], using `transmute` on structs
2909 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
2910 always been undefined behavior, but is now more likely to break in practice.
2911 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
2912 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
2913 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
2914 - [Overlapping inherent `impl`s are now a hard error][40728]
2915 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
2916 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
2917 `out.asm` and `out.ll` instead of only one of the filetypes.
2918 - [ calling a function that returns `Self` will no longer work][41805] when
2919 the size of `Self` cannot be statically determined.
2920 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
2921 this has caused a few regressions namely:
2923 - Changed the link order of local static/dynamic libraries (respecting the
2924 order on given rather than having the compiler reorder).
2925 - Changed how MinGW is linked, native code linked to dynamic libraries
2926 may require manually linking to the gcc support library (for the native
2929 [38165]: https://github.com/rust-lang/rust/pull/38165
2930 [39799]: https://github.com/rust-lang/rust/pull/39799
2931 [39891]: https://github.com/rust-lang/rust/pull/39891
2932 [39983]: https://github.com/rust-lang/rust/pull/39983
2933 [40043]: https://github.com/rust-lang/rust/pull/40043
2934 [40241]: https://github.com/rust-lang/rust/pull/40241
2935 [40338]: https://github.com/rust-lang/rust/pull/40338
2936 [40367]: https://github.com/rust-lang/rust/pull/40367
2937 [40377]: https://github.com/rust-lang/rust/pull/40377
2938 [40409]: https://github.com/rust-lang/rust/pull/40409
2939 [40516]: https://github.com/rust-lang/rust/pull/40516
2940 [40556]: https://github.com/rust-lang/rust/pull/40556
2941 [40561]: https://github.com/rust-lang/rust/pull/40561
2942 [40589]: https://github.com/rust-lang/rust/pull/40589
2943 [40612]: https://github.com/rust-lang/rust/pull/40612
2944 [40723]: https://github.com/rust-lang/rust/pull/40723
2945 [40728]: https://github.com/rust-lang/rust/pull/40728
2946 [40731]: https://github.com/rust-lang/rust/pull/40731
2947 [40734]: https://github.com/rust-lang/rust/pull/40734
2948 [40805]: https://github.com/rust-lang/rust/pull/40805
2949 [40807]: https://github.com/rust-lang/rust/pull/40807
2950 [40828]: https://github.com/rust-lang/rust/pull/40828
2951 [40870]: https://github.com/rust-lang/rust/pull/40870
2952 [41085]: https://github.com/rust-lang/rust/pull/41085
2953 [41143]: https://github.com/rust-lang/rust/pull/41143
2954 [41168]: https://github.com/rust-lang/rust/pull/41168
2955 [41270]: https://github.com/rust-lang/rust/issues/41270
2956 [41469]: https://github.com/rust-lang/rust/pull/41469
2957 [41805]: https://github.com/rust-lang/rust/issues/41805
2958 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
2959 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
2960 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
2961 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
2962 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
2963 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
2964 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
2965 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
2966 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
2967 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
2968 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
2969 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
2970 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
2971 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
2974 Version 1.17.0 (2017-04-27)
2975 ===========================
2980 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
2981 * [Fields of structs may be initialized without duplicating the field/variable
2982 names][39761]. [RFC 1682]
2983 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
2984 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2985 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
2986 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
2987 `'b`. Soundness fix.
2988 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
2989 * [Static variables may contain references to other statics][40027]
2994 * [Exit quickly on only `--emit dep-info`][40336]
2995 * [Make `-C relocation-model` more correctly determine whether the linker
2996 creates a position-independent executable][40245]
2997 * [Add `-C overflow-checks` to directly control whether integer overflow
2999 * [The rustc type checker now checks items on demand instead of in a single
3000 in-order pass][40008]. This is mostly an internal refactoring in support of
3001 future work, including incremental type checking, but also resolves [RFC
3002 1647], allowing `Self` to appear in `impl` `where` clauses.
3003 * [Optimize vtable loads][39995]
3004 * [Turn off vectorization for Emscripten targets][39990]
3005 * [Provide suggestions for unknown macros imported with `use`][39953]
3006 * [Fix ICEs in path resolution][39939]
3007 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
3008 * [Add clearer error message using `&str + &str`][39116]
3019 * [`Ordering::then`]
3020 * [`Ordering::then_with`]
3021 * [`BTreeMap::range`]
3022 * [`BTreeMap::range_mut`]
3023 * [`collections::Bound`]
3024 * [`process::abort`]
3025 * [`ptr::read_unaligned`]
3026 * [`ptr::write_unaligned`]
3027 * [`Result::expect_err`]
3030 * [`Cell::into_inner`]
3036 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
3037 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
3038 * [`String` implements `FromIterator<&char>`][40028]
3039 * `Box` [implements][40009] a number of new conversions:
3040 `From<Box<str>> for String`,
3041 `From<Box<[T]>> for Vec<T>`,
3042 `From<Box<CStr>> for CString`,
3043 `From<Box<OsStr>> for OsString`,
3044 `From<Box<Path>> for PathBuf`,
3045 `Into<Box<str>> for String`,
3046 `Into<Box<[T]>> for Vec<T>`,
3047 `Into<Box<CStr>> for CString`,
3048 `Into<Box<OsStr>> for OsString`,
3049 `Into<Box<Path>> for PathBuf`,
3050 `Default for Box<str>`,
3051 `Default for Box<CStr>`,
3052 `Default for Box<OsStr>`,
3053 `From<&CStr> for Box<CStr>`,
3054 `From<&OsStr> for Box<OsStr>`,
3055 `From<&Path> for Box<Path>`
3056 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
3057 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
3058 * [Slightly optimize `slice::sort`][39538]
3059 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
3060 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
3061 `Box<str>` implements `From<&str>`][39438]
3062 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
3063 `From<(I, u16)> where I: Into<IpAddr>`][39372]
3064 * [`format!` estimates the needed capacity before writing a string][39356]
3065 * [Support unprivileged symlink creation in Windows][38921]
3066 * [`PathBuf` implements `Default`][38764]
3067 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
3068 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
3069 and poor hash functions.
3074 * [Add `cargo check --all`][cargo/3731]
3075 * [Add an option to ignore SSL revocation checking][cargo/3699]
3076 * [Add `cargo run --package`][cargo/3691]
3077 * [Add `required_features`][cargo/3667]
3078 * [Assume `build.rs` is a build script][cargo/3664]
3079 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
3084 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
3086 * [The "Unstable Book" documents nightly-only features][ubook]
3087 * [Improve the style of the sidebar in rustdoc output][40265]
3088 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
3089 * [Fix MSP430 breakage due to `i128`][40257]
3090 * [Preliminary Solaris/SPARCv9 support][39903]
3091 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
3092 run without installing the MSVC runtime.
3093 * [`rustdoc --test` includes file names in test names][39788]
3094 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
3095 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
3096 * [Initial support for `aarch64-unknown-freebsd`][39491]
3097 * [Initial support for `i686-unknown-netbsd`][39426]
3098 * [This release no longer includes the old makefile build system][39431]. Rust
3099 is built with a custom build system, written in Rust, and with Cargo.
3100 * [Add Debug implementations for libcollection structs][39002]
3101 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
3102 * [`--test-threads=0` produces an error][38945]
3103 * [`rustup` installs documentation by default][40526]
3104 * [The Rust source includes NatVis visualizations][39843]. These can be used by
3105 WinDbg and Visual Studio to improve the debugging experience.
3110 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
3111 workaround, either use MSVC 2015 or run vcvars.bat.
3112 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3113 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
3114 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
3116 * [`format!` and `Display::to_string` panic if an underlying formatting
3117 implementation returns an error][40117]. Previously the error was silently
3118 ignored. It is incorrect for `write_fmt` to return an error when writing
3120 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
3121 crates were marked stable and could be accessed from the stable toolchain.
3122 * [Rust git source no longer includes vendored crates][39728]. Those that need
3123 to build with vendored crates should build from release tarballs.
3124 * [Fix inert attributes from `proc_macro_derives`][39572]
3125 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
3126 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
3128 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
3129 existing code generally ignores the type of dead-code unless a type-hint is
3130 provided; this can cause surprising inference interactions particularly around
3131 defaulting. The new code uniformly ignores the result type of dead-code.
3132 * [Tuple-struct constructors with private fields are no longer visible][38932]
3133 * [Lifetime parameters that do not appear in the arguments are now considered
3134 early-bound][38897], resolving a soundness bug (#[32330]). The
3135 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
3137 * [rustdoc: fix doctests with non-feature crate attributes][38161]
3138 * [Make transmuting from fn item types to pointer-sized types a hard
3141 [27787]: https://github.com/rust-lang/rust/issues/27787
3142 [32330]: https://github.com/rust-lang/rust/issues/32330
3143 [34198]: https://github.com/rust-lang/rust/pull/34198
3144 [38161]: https://github.com/rust-lang/rust/pull/38161
3145 [38368]: https://github.com/rust-lang/rust/pull/38368
3146 [38584]: https://github.com/rust-lang/rust/issues/38584
3147 [38661]: https://github.com/rust-lang/rust/pull/38661
3148 [38764]: https://github.com/rust-lang/rust/pull/38764
3149 [38864]: https://github.com/rust-lang/rust/issues/38864
3150 [38897]: https://github.com/rust-lang/rust/pull/38897
3151 [38921]: https://github.com/rust-lang/rust/pull/38921
3152 [38932]: https://github.com/rust-lang/rust/pull/38932
3153 [38945]: https://github.com/rust-lang/rust/pull/38945
3154 [38981]: https://github.com/rust-lang/rust/pull/38981
3155 [39002]: https://github.com/rust-lang/rust/pull/39002
3156 [39116]: https://github.com/rust-lang/rust/pull/39116
3157 [39193]: https://github.com/rust-lang/rust/pull/39193
3158 [39265]: https://github.com/rust-lang/rust/pull/39265
3159 [39356]: https://github.com/rust-lang/rust/pull/39356
3160 [39372]: https://github.com/rust-lang/rust/pull/39372
3161 [39426]: https://github.com/rust-lang/rust/pull/39426
3162 [39431]: https://github.com/rust-lang/rust/pull/39431
3163 [39438]: https://github.com/rust-lang/rust/pull/39438
3164 [39440]: https://github.com/rust-lang/rust/pull/39440
3165 [39485]: https://github.com/rust-lang/rust/pull/39485
3166 [39491]: https://github.com/rust-lang/rust/pull/39491
3167 [39518]: https://github.com/rust-lang/rust/pull/39518
3168 [39538]: https://github.com/rust-lang/rust/pull/39538
3169 [39572]: https://github.com/rust-lang/rust/pull/39572
3170 [39633]: https://github.com/rust-lang/rust/pull/39633
3171 [39642]: https://github.com/rust-lang/rust/pull/39642
3172 [39728]: https://github.com/rust-lang/rust/pull/39728
3173 [39761]: https://github.com/rust-lang/rust/pull/39761
3174 [39788]: https://github.com/rust-lang/rust/pull/39788
3175 [39793]: https://github.com/rust-lang/rust/pull/39793
3176 [39837]: https://github.com/rust-lang/rust/pull/39837
3177 [39843]: https://github.com/rust-lang/rust/pull/39843
3178 [39851]: https://github.com/rust-lang/rust/pull/39851
3179 [39903]: https://github.com/rust-lang/rust/pull/39903
3180 [39939]: https://github.com/rust-lang/rust/pull/39939
3181 [39953]: https://github.com/rust-lang/rust/pull/39953
3182 [39960]: https://github.com/rust-lang/rust/pull/39960
3183 [39990]: https://github.com/rust-lang/rust/pull/39990
3184 [39995]: https://github.com/rust-lang/rust/pull/39995
3185 [40008]: https://github.com/rust-lang/rust/pull/40008
3186 [40009]: https://github.com/rust-lang/rust/pull/40009
3187 [40027]: https://github.com/rust-lang/rust/pull/40027
3188 [40028]: https://github.com/rust-lang/rust/pull/40028
3189 [40037]: https://github.com/rust-lang/rust/pull/40037
3190 [40117]: https://github.com/rust-lang/rust/pull/40117
3191 [40166]: https://github.com/rust-lang/rust/pull/40166
3192 [40245]: https://github.com/rust-lang/rust/pull/40245
3193 [40257]: https://github.com/rust-lang/rust/pull/40257
3194 [40261]: https://github.com/rust-lang/rust/pull/40261
3195 [40265]: https://github.com/rust-lang/rust/pull/40265
3196 [40319]: https://github.com/rust-lang/rust/pull/40319
3197 [40336]: https://github.com/rust-lang/rust/pull/40336
3198 [40526]: https://github.com/rust-lang/rust/pull/40526
3199 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3200 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
3201 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
3202 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
3203 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
3204 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
3205 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
3206 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
3207 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
3208 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
3209 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
3210 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
3211 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
3212 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
3213 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
3214 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
3215 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
3216 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
3217 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
3218 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
3219 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
3220 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
3221 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
3222 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
3223 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
3224 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
3225 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
3226 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
3227 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
3228 [mdbook]: https://crates.io/crates/mdbook
3229 [ubook]: https://doc.rust-lang.org/unstable-book/
3232 Version 1.16.0 (2017-03-16)
3233 ===========================
3238 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3239 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3240 match patterns][38069]
3241 * [Clean up semantics of `self` in an import list][38313]
3242 * [`Self` may appear in `impl` headers][38920]
3243 * [`Self` may appear in struct expressions][39282]
3248 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
3249 a `.rmeta` file containing only crate metadata][38571]. This can be
3250 used by tools like the Rust Language Service to perform
3251 metadata-only builds.
3252 * [Levenshtein based typo suggestions now work in most places, while
3253 previously they worked only for fields and sometimes for local
3254 variables][38927]. Together with the overhaul of "no
3255 resolution"/"unexpected resolution" errors (#[38154]) they result in
3256 large and systematic improvement in resolution diagnostics.
3257 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
3259 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
3260 * [`rustc` no longer attempts to provide "consider using an explicit
3261 lifetime" suggestions][37057]. They were inaccurate.
3266 * [`VecDeque::truncate`]
3267 * [`VecDeque::resize`]
3268 * [`String::insert_str`]
3269 * [`Duration::checked_add`]
3270 * [`Duration::checked_sub`]
3271 * [`Duration::checked_div`]
3272 * [`Duration::checked_mul`]
3275 * [`SocketAddr::is_ipv4`]
3276 * [`SocketAddr::is_ipv6`]
3277 * [`IpAddr::is_ipv4`]
3278 * [`IpAddr::is_ipv6`]
3280 * [`Vec::dedup_by_key`]
3281 * [`Result::unwrap_or_default`]
3282 * [`<*const T>::wrapping_offset`]
3283 * [`<*mut T>::wrapping_offset`]
3284 * `CommandExt::creation_flags`
3285 * [`File::set_permissions`]
3286 * [`String::split_off`]
3291 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
3292 their argument by `Borrow` parameter][37761]
3293 * [All public types in std implement `Debug`][38006]
3294 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
3295 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
3296 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3298 * [std: Fix partial writes in `LineWriter`][38062]
3299 * [std: Clamp max read/write sizes on Unix][38062]
3300 * [Use more specific panic message for `&str` slicing errors][38066]
3301 * [`TcpListener::set_only_v6` is deprecated][38304]. This
3302 functionality cannot be achieved in std currently.
3303 * [`writeln!`, like `println!`, now accepts a form with no string
3304 or formatting arguments, to just print a newline][38469]
3305 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
3306 * [Reduce the size of static data in `std_unicode::tables`][38781]
3307 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
3308 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
3310 * [`Duration` implements `Sum`][38712]
3311 * [`String` implements `ToSocketAddrs`][39048]
3316 * [The `cargo check` command does a type check of a project without
3317 building it][cargo/3296]
3318 * [crates.io will display CI badges from Travis and AppVeyor, if
3319 specified in Cargo.toml][cargo/3546]
3320 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
3321 * [Compilation profiles accept integer values for `debug`, in addition
3322 to `true` and `false`. These are passed to `rustc` as the value to
3323 `-C debuginfo`][cargo/3534]
3324 * [Implement `cargo --version --verbose`][cargo/3604]
3325 * [All builds now output 'dep-info' build dependencies compatible with
3326 make and ninja][cargo/3557]
3327 * [Build all workspace members with `build --all`][cargo/3511]
3328 * [Document all workspace members with `doc --all`][cargo/3515]
3329 * [Path deps outside workspace are not members][cargo/3443]
3334 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
3335 the path to the Rust implementation][38589]
3336 * [The `armv7-linux-androideabi` target no longer enables NEON
3337 extensions, per Google's ABI guide][38413]
3338 * [The stock standard library can be compiled for Redox OS][38401]
3339 * [Rust has initial SPARC support][38726]. Tier 3. No builds
3341 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
3343 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
3348 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3349 match patterns][38069]
3350 * In this release, references to uninhabited types can not be
3351 pattern-matched. This was accidentally allowed in 1.15.
3352 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3353 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3355 * [Clean up semantics of `self` in an import list][38313]
3356 * Reimplemented lifetime elision. This change was almost entirely compatible
3357 with existing code, but it did close a number of small bugs and loopholes,
3358 as well as being more accepting in some other [cases][41105].
3360 [37057]: https://github.com/rust-lang/rust/pull/37057
3361 [37761]: https://github.com/rust-lang/rust/pull/37761
3362 [38006]: https://github.com/rust-lang/rust/pull/38006
3363 [38051]: https://github.com/rust-lang/rust/pull/38051
3364 [38062]: https://github.com/rust-lang/rust/pull/38062
3365 [38062]: https://github.com/rust-lang/rust/pull/38622
3366 [38066]: https://github.com/rust-lang/rust/pull/38066
3367 [38069]: https://github.com/rust-lang/rust/pull/38069
3368 [38131]: https://github.com/rust-lang/rust/pull/38131
3369 [38154]: https://github.com/rust-lang/rust/pull/38154
3370 [38274]: https://github.com/rust-lang/rust/pull/38274
3371 [38304]: https://github.com/rust-lang/rust/pull/38304
3372 [38313]: https://github.com/rust-lang/rust/pull/38313
3373 [38314]: https://github.com/rust-lang/rust/pull/38314
3374 [38327]: https://github.com/rust-lang/rust/pull/38327
3375 [38401]: https://github.com/rust-lang/rust/pull/38401
3376 [38413]: https://github.com/rust-lang/rust/pull/38413
3377 [38469]: https://github.com/rust-lang/rust/pull/38469
3378 [38559]: https://github.com/rust-lang/rust/pull/38559
3379 [38571]: https://github.com/rust-lang/rust/pull/38571
3380 [38580]: https://github.com/rust-lang/rust/pull/38580
3381 [38589]: https://github.com/rust-lang/rust/pull/38589
3382 [38670]: https://github.com/rust-lang/rust/pull/38670
3383 [38712]: https://github.com/rust-lang/rust/pull/38712
3384 [38726]: https://github.com/rust-lang/rust/pull/38726
3385 [38781]: https://github.com/rust-lang/rust/pull/38781
3386 [38798]: https://github.com/rust-lang/rust/pull/38798
3387 [38909]: https://github.com/rust-lang/rust/pull/38909
3388 [38920]: https://github.com/rust-lang/rust/pull/38920
3389 [38927]: https://github.com/rust-lang/rust/pull/38927
3390 [39048]: https://github.com/rust-lang/rust/pull/39048
3391 [39282]: https://github.com/rust-lang/rust/pull/39282
3392 [39379]: https://github.com/rust-lang/rust/pull/39379
3393 [41105]: https://github.com/rust-lang/rust/issues/41105
3394 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3395 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3396 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
3397 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
3398 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
3399 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
3400 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
3401 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
3402 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
3403 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
3404 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
3405 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
3406 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
3407 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
3408 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
3409 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
3410 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
3411 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
3412 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
3413 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
3414 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
3415 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
3416 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
3417 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
3418 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
3419 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
3420 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
3421 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
3422 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
3423 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3426 Version 1.15.1 (2017-02-09)
3427 ===========================
3429 * [Fix IntoIter::as_mut_slice's signature][39466]
3430 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
3432 [39466]: https://github.com/rust-lang/rust/pull/39466
3433 [39523]: https://github.com/rust-lang/rust/pull/39523
3436 Version 1.15.0 (2017-02-02)
3437 ===========================
3442 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
3443 stable. This allows popular code-generating crates like Serde and Diesel to
3444 work ergonomically. [RFC 1681].
3445 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
3446 with curly braces][36868]. Part of [RFC 1506].
3447 * [A number of minor changes to name resolution have been activated][37127].
3448 They add up to more consistent semantics, allowing for future evolution of
3449 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3450 details of what is different. The breaking changes here have been transitioned
3451 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3452 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
3454 * [`?Sized` can be used in `where` clauses][37791]
3455 * [There is now a limit on the size of monomorphized types and it can be
3456 modified with the `#![type_size_limit]` crate attribute, similarly to
3457 the `#![recursion_limit]` attribute][37789]
3462 * [On Windows, the compiler will apply dllimport attributes when linking to
3463 extern functions][37973]. Additional attributes and flags can control which
3464 library kind is linked and its name. [RFC 1717].
3465 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3466 * [The `--test` flag works with procedural macro crates][38107]
3467 * [Fix `extern "aapcs" fn` ABI][37814]
3468 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
3469 * [The `format!` expander recognizes incorrect `printf` and shell-style
3470 formatting directives and suggests the correct format][37613].
3471 * [Only report one error for all unused imports in an import list][37456]
3473 Compiler Performance
3474 --------------------
3476 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
3477 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
3478 * [Don't clone in `UnificationTable::probe`][37848]
3479 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
3480 * [Use small vectors in type walker][37760]
3481 * [Macro expansion performance was improved][37701]
3482 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
3483 * [Replace FNV with a faster hash function][37229]
3488 * [`std::iter::Iterator::min_by`]
3489 * [`std::iter::Iterator::max_by`]
3490 * [`std::os::*::fs::FileExt`]
3491 * [`std::sync::atomic::Atomic*::get_mut`]
3492 * [`std::sync::atomic::Atomic*::into_inner`]
3493 * [`std::vec::IntoIter::as_slice`]
3494 * [`std::vec::IntoIter::as_mut_slice`]
3495 * [`std::sync::mpsc::Receiver::try_iter`]
3496 * [`std::os::unix::process::CommandExt::before_exec`]
3497 * [`std::rc::Rc::strong_count`]
3498 * [`std::rc::Rc::weak_count`]
3499 * [`std::sync::Arc::strong_count`]
3500 * [`std::sync::Arc::weak_count`]
3501 * [`std::char::encode_utf8`]
3502 * [`std::char::encode_utf16`]
3503 * [`std::cell::Ref::clone`]
3504 * [`std::io::Take::into_inner`]
3509 * [The standard sorting algorithm has been rewritten for dramatic performance
3510 improvements][38192]. It is a hybrid merge sort, drawing influences from
3511 Timsort. Previously it was a naive merge sort.
3512 * [`Iterator::nth` no longer has a `Sized` bound][38134]
3513 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
3515 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
3516 and `char_indices().last()`][37882]
3517 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
3518 * [Chinese characters display correctly in `fmt::Debug`][37855]
3519 * [Derive `Default` for `Duration`][37699]
3520 * [Support creation of anonymous pipes on WinXP/2k][37677]
3521 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
3522 * [Don't pass overlapped handles to processes][38835]
3527 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3528 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3529 should instead check the variable at runtime with `std::env`. That the value
3530 was set at build time was a bug, and incorrect when cross-compiling. This
3531 change is known to cause breakage.
3532 * [Add `--all` flag to `cargo test`][cargo/3221]
3533 * [Compile statically against the MSVC CRT][cargo/3363]
3534 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
3535 * [Link OpenSSL statically on OSX][cargo/3311]
3536 * [Apply new fingerprinting to build dir outputs][cargo/3310]
3537 * [Test for bad path overrides with summaries][cargo/3336]
3538 * [Require `cargo install --vers` to take a semver version][cargo/3338]
3539 * [Fix retrying crate downloads for network errors][cargo/3348]
3540 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
3541 * [Emit more info on --message-format=json][cargo/3319]
3542 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
3543 * [Don't ignore errors in workspace manifest][cargo/3409]
3544 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
3549 * [Test runners (binaries built with `--test`) now support a `--list` argument
3550 that lists the tests it contains][38185]
3551 * [Test runners now support a `--exact` argument that makes the test filter
3552 match exactly, instead of matching only a substring of the test name][38181]
3553 * [rustdoc supports a `--playground-url` flag][37763]
3554 * [rustdoc provides more details about `#[should_panic]` errors][37749]
3559 * [The Rust build system is now written in Rust][37817]. The Makefiles may
3560 continue to be used in this release by passing `--disable-rustbuild` to the
3561 configure script, but they will be deleted soon. Note that the new build
3562 system uses a different on-disk layout that will likely affect any scripts
3564 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
3566 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
3567 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
3573 * [A number of minor changes to name resolution have been activated][37127].
3574 They add up to more consistent semantics, allowing for future evolution of
3575 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3576 details of what is different. The breaking changes here have been transitioned
3577 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3578 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3579 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3580 should instead check the variable at runtime with `std::env`. That the value
3581 was set at build time was a bug, and incorrect when cross-compiling. This
3582 change is known to cause breakage.
3583 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
3584 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
3585 1.10 and is now an error by default. It will become a hard error in the near
3587 * [The semantics relating modules to file system directories are changing in
3588 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
3589 lint, which is a warning in this release, and will become a hard error in the
3591 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3592 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
3593 the underlying iterator][37834]
3595 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
3596 [33685]: https://github.com/rust-lang/rust/issues/33685
3597 [36868]: https://github.com/rust-lang/rust/pull/36868
3598 [37127]: https://github.com/rust-lang/rust/pull/37127
3599 [37229]: https://github.com/rust-lang/rust/pull/37229
3600 [37456]: https://github.com/rust-lang/rust/pull/37456
3601 [37527]: https://github.com/rust-lang/rust/pull/37527
3602 [37602]: https://github.com/rust-lang/rust/pull/37602
3603 [37613]: https://github.com/rust-lang/rust/pull/37613
3604 [37615]: https://github.com/rust-lang/rust/pull/37615
3605 [37636]: https://github.com/rust-lang/rust/pull/37636
3606 [37627]: https://github.com/rust-lang/rust/pull/37627
3607 [37642]: https://github.com/rust-lang/rust/pull/37642
3608 [37677]: https://github.com/rust-lang/rust/pull/37677
3609 [37699]: https://github.com/rust-lang/rust/pull/37699
3610 [37701]: https://github.com/rust-lang/rust/pull/37701
3611 [37705]: https://github.com/rust-lang/rust/pull/37705
3612 [37749]: https://github.com/rust-lang/rust/pull/37749
3613 [37760]: https://github.com/rust-lang/rust/pull/37760
3614 [37763]: https://github.com/rust-lang/rust/pull/37763
3615 [37764]: https://github.com/rust-lang/rust/pull/37764
3616 [37789]: https://github.com/rust-lang/rust/pull/37789
3617 [37791]: https://github.com/rust-lang/rust/pull/37791
3618 [37814]: https://github.com/rust-lang/rust/pull/37814
3619 [37817]: https://github.com/rust-lang/rust/pull/37817
3620 [37834]: https://github.com/rust-lang/rust/pull/37834
3621 [37848]: https://github.com/rust-lang/rust/pull/37848
3622 [37855]: https://github.com/rust-lang/rust/pull/37855
3623 [37882]: https://github.com/rust-lang/rust/pull/37882
3624 [37888]: https://github.com/rust-lang/rust/pull/37888
3625 [37973]: https://github.com/rust-lang/rust/pull/37973
3626 [37979]: https://github.com/rust-lang/rust/pull/37979
3627 [38086]: https://github.com/rust-lang/rust/pull/38086
3628 [38107]: https://github.com/rust-lang/rust/pull/38107
3629 [38117]: https://github.com/rust-lang/rust/pull/38117
3630 [38134]: https://github.com/rust-lang/rust/pull/38134
3631 [38146]: https://github.com/rust-lang/rust/pull/38146
3632 [38181]: https://github.com/rust-lang/rust/pull/38181
3633 [38182]: https://github.com/rust-lang/rust/pull/38182
3634 [38185]: https://github.com/rust-lang/rust/pull/38185
3635 [38192]: https://github.com/rust-lang/rust/pull/38192
3636 [38279]: https://github.com/rust-lang/rust/pull/38279
3637 [38835]: https://github.com/rust-lang/rust/pull/38835
3638 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3639 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3640 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
3641 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
3642 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
3643 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
3644 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
3645 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
3646 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
3647 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
3648 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
3649 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
3650 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
3651 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
3652 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
3653 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
3654 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
3655 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
3656 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
3657 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
3658 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
3659 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
3660 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
3661 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
3662 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
3663 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
3664 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
3665 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
3666 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
3667 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
3668 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
3669 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
3670 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
3671 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
3672 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
3673 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
3674 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
3675 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
3678 Version 1.14.0 (2016-12-22)
3679 ===========================
3684 * [`..` matches multiple tuple fields in enum variants, structs
3685 and tuples][36843]. [RFC 1492].
3686 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
3687 * [`use *` and `use ::*` both glob-import from the crate root][37367]
3688 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
3689 dereferencing][36822]
3694 * [Mark enums with non-zero discriminant as non-zero][37224]
3695 * [Lower-case `static mut` names are linted like other
3696 statics and consts][37162]
3697 * [Fix ICE on some macros in const integer positions
3698 (e.g. `[u8; m!()]`)][36819]
3699 * [Improve error message and snippet for "did you mean `x`"][36798]
3700 * [Add a panic-strategy field to the target specification][36794]
3701 * [Include LLVM version in `--version --verbose`][37200]
3703 Compile-time Optimizations
3704 --------------------------
3706 * [Improve macro expansion performance][37569]
3707 * [Shrink `Expr_::ExprInlineAsm`][37445]
3708 * [Replace all uses of SHA-256 with BLAKE2b][37439]
3709 * [Reduce the number of bytes hashed by `IchHasher`][37427]
3710 * [Avoid more allocations when compiling html5ever][37373]
3711 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
3712 * [Avoid some allocations in the macro parser][37318]
3713 * [Use a faster deflate setting][37298]
3714 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
3715 during interning of slices][37270]
3716 * [Optimize `write_metadata`][37267]
3717 * [Don't process obligation forest cycles when stalled][37231]
3718 * [Avoid many `CrateConfig` clones][37161]
3719 * [Optimize `Substs::super_fold_with`][37108]
3720 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
3721 * [Speed up `plug_leaks`][36917]
3726 * [`println!()`, with no arguments, prints newline][36825].
3727 Previously, an empty string was required to achieve the same.
3728 * [`Wrapping` impls standard binary and unary operators, as well as
3729 the `Sum` and `Product` iterators][37356]
3730 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
3732 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
3733 `VecDeque` iterators][37315]
3734 * [Improve `SipHasher` performance on small values][37312]
3735 * [Add Iterator trait TrustedLen to enable better FromIterator /
3737 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
3738 * [`ReadDir` implements `Debug`][37221]
3739 * [Implement `RefUnwindSafe` for atomic types][37178]
3740 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
3741 * [Avoid allocations in `Decoder::read_str`][37064]
3742 * [`io::Error` implements `From<io::ErrorKind>`][37037]
3743 * [Impl `Debug` for raw pointers to unsized data][36880]
3744 * [Don't reuse `HashMap` random seeds][37470]
3745 * [The internal memory layout of `HashMap` is more cache-friendly, for
3746 significant improvements in some operations][36692]
3747 * [`HashMap` uses less memory on 32-bit architectures][36595]
3748 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
3753 * [Expose rustc cfg values to build scripts][cargo/3243]
3754 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
3755 * [Fix passing --features when testing multiple packages][cargo/3280]
3756 * [Use a single profile set per workspace][cargo/3249]
3757 * [Load `replace` sections from lock files][cargo/3220]
3758 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
3763 * [rustup is the recommended Rust installation method][1.14rustup]
3764 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
3765 S390x. These are [tier 2] platforms and may have major defects. Follow the
3766 instructions on the website to install, or add the targets to an existing
3767 installation with `rustup target add`. The new target triples are:
3768 - `mips-unknown-linux-gnu`
3769 - `mipsel-unknown-linux-gnu`
3770 - `mips64-unknown-linux-gnuabi64`
3771 - `mips64el-unknown-linux-gnuabi64 `
3772 - `powerpc-unknown-linux-gnu`
3773 - `powerpc64-unknown-linux-gnu`
3774 - `powerpc64le-unknown-linux-gnu`
3775 - `s390x-unknown-linux-gnu `
3776 * This release includes target (std) builds for ARM Linux running MUSL
3777 libc. These are [tier 2] platforms and may have major defects. Add the
3778 following triples to an existing rustup installation with `rustup target add`:
3779 - `arm-unknown-linux-musleabi`
3780 - `arm-unknown-linux-musleabihf`
3781 - `armv7-unknown-linux-musleabihf`
3782 * This release includes [experimental support for WebAssembly][1.14wasm], via
3783 the `wasm32-unknown-emscripten` target. This target is known to have major
3784 defects. Please test, report, and fix.
3785 * rustup no longer installs documentation by default. Run `rustup
3786 component add rust-docs` to install.
3787 * [Fix line stepping in debugger][37310]
3788 * [Enable line number debuginfo in releases][37280]
3793 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3794 * [Add support for Fuchsia OS][37313]
3795 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3800 * [A number of forward-compatibility lints used by the compiler
3801 to gradually introduce language changes have been converted
3802 to deny by default][36894]:
3803 - ["use of inaccessible extern crate erroneously allowed"][36886]
3804 - ["type parameter default erroneously allowed in invalid location"][36887]
3805 - ["detects super or self keywords at the beginning of global path"][36888]
3806 - ["two overlapping inherent impls define an item with the same name
3807 were erroneously allowed"][36889]
3808 - ["floating-point constants cannot be used in patterns"][36890]
3809 - ["constants of struct or enum type can only be used in a pattern if
3810 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3811 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3812 * [Prohibit patterns in trait methods without bodies][37378]
3813 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3814 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3815 * [The `$crate` macro variable is accepted in fewer locations][37213]
3816 * [Impls specifying extra region requirements beyond the trait
3817 they implement are rejected][37167]
3818 * [Enums may not be unsized][37111]. Unsized enums are intended to
3819 work but never have. For now they are forbidden.
3820 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3822 [tier 2]: https://forge.rust-lang.org/platform-support.html
3823 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3824 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3825 [36430]: https://github.com/rust-lang/rust/pull/36430
3826 [36595]: https://github.com/rust-lang/rust/pull/36595
3827 [36595]: https://github.com/rust-lang/rust/pull/36595
3828 [36692]: https://github.com/rust-lang/rust/pull/36692
3829 [36767]: https://github.com/rust-lang/rust/pull/36767
3830 [36794]: https://github.com/rust-lang/rust/pull/36794
3831 [36798]: https://github.com/rust-lang/rust/pull/36798
3832 [36819]: https://github.com/rust-lang/rust/pull/36819
3833 [36822]: https://github.com/rust-lang/rust/pull/36822
3834 [36825]: https://github.com/rust-lang/rust/pull/36825
3835 [36843]: https://github.com/rust-lang/rust/pull/36843
3836 [36880]: https://github.com/rust-lang/rust/pull/36880
3837 [36886]: https://github.com/rust-lang/rust/issues/36886
3838 [36887]: https://github.com/rust-lang/rust/issues/36887
3839 [36888]: https://github.com/rust-lang/rust/issues/36888
3840 [36889]: https://github.com/rust-lang/rust/issues/36889
3841 [36890]: https://github.com/rust-lang/rust/issues/36890
3842 [36891]: https://github.com/rust-lang/rust/issues/36891
3843 [36892]: https://github.com/rust-lang/rust/issues/36892
3844 [36894]: https://github.com/rust-lang/rust/pull/36894
3845 [36917]: https://github.com/rust-lang/rust/pull/36917
3846 [36993]: https://github.com/rust-lang/rust/pull/36993
3847 [37037]: https://github.com/rust-lang/rust/pull/37037
3848 [37064]: https://github.com/rust-lang/rust/pull/37064
3849 [37094]: https://github.com/rust-lang/rust/pull/37094
3850 [37108]: https://github.com/rust-lang/rust/pull/37108
3851 [37111]: https://github.com/rust-lang/rust/pull/37111
3852 [37161]: https://github.com/rust-lang/rust/pull/37161
3853 [37162]: https://github.com/rust-lang/rust/pull/37162
3854 [37167]: https://github.com/rust-lang/rust/pull/37167
3855 [37178]: https://github.com/rust-lang/rust/pull/37178
3856 [37200]: https://github.com/rust-lang/rust/pull/37200
3857 [37213]: https://github.com/rust-lang/rust/pull/37213
3858 [37221]: https://github.com/rust-lang/rust/pull/37221
3859 [37224]: https://github.com/rust-lang/rust/pull/37224
3860 [37230]: https://github.com/rust-lang/rust/pull/37230
3861 [37231]: https://github.com/rust-lang/rust/pull/37231
3862 [37247]: https://github.com/rust-lang/rust/pull/37247
3863 [37267]: https://github.com/rust-lang/rust/pull/37267
3864 [37270]: https://github.com/rust-lang/rust/pull/37270
3865 [37273]: https://github.com/rust-lang/rust/pull/37273
3866 [37280]: https://github.com/rust-lang/rust/pull/37280
3867 [37298]: https://github.com/rust-lang/rust/pull/37298
3868 [37306]: https://github.com/rust-lang/rust/pull/37306
3869 [37310]: https://github.com/rust-lang/rust/pull/37310
3870 [37312]: https://github.com/rust-lang/rust/pull/37312
3871 [37313]: https://github.com/rust-lang/rust/pull/37313
3872 [37315]: https://github.com/rust-lang/rust/pull/37315
3873 [37318]: https://github.com/rust-lang/rust/pull/37318
3874 [37322]: https://github.com/rust-lang/rust/pull/37322
3875 [37326]: https://github.com/rust-lang/rust/pull/37326
3876 [37351]: https://github.com/rust-lang/rust/pull/37351
3877 [37356]: https://github.com/rust-lang/rust/pull/37356
3878 [37367]: https://github.com/rust-lang/rust/pull/37367
3879 [37373]: https://github.com/rust-lang/rust/pull/37373
3880 [37378]: https://github.com/rust-lang/rust/pull/37378
3881 [37389]: https://github.com/rust-lang/rust/pull/37389
3882 [37392]: https://github.com/rust-lang/rust/pull/37392
3883 [37427]: https://github.com/rust-lang/rust/pull/37427
3884 [37439]: https://github.com/rust-lang/rust/pull/37439
3885 [37445]: https://github.com/rust-lang/rust/pull/37445
3886 [37470]: https://github.com/rust-lang/rust/pull/37470
3887 [37569]: https://github.com/rust-lang/rust/pull/37569
3888 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3889 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
3890 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
3891 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
3892 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
3893 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
3894 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
3897 Version 1.13.0 (2016-11-10)
3898 ===========================
3903 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
3904 errors, like the `try!` macro, described in [RFC 0243].
3905 * [Stabilize macros in type position][36014]. Described in [RFC 873].
3906 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
3907 * [Fix `#[derive]` for empty tuple structs/variants][35728]
3908 * [Fix lifetime rules for 'if' conditions][36029]
3909 * [Avoid loading and parsing unconfigured non-inline modules][36482]
3914 * [Add the `-C link-arg` argument][36574]
3915 * [Remove the old AST-based backend from rustc_trans][35764]
3916 * [Don't enable NEON by default on armv7 Linux][35814]
3917 * [Fix debug line number info for macro expansions][35238]
3918 * [Do not emit "class method" debuginfo for types that are not
3919 DICompositeType][36008]
3920 * [Warn about multiple conflicting #[repr] hints][34623]
3921 * [When sizing DST, don't double-count nested struct prefixes][36351]
3922 * [Default RUST_MIN_STACK to 16MiB for now][36505]
3923 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
3924 * [Reject macros with empty repetitions to avoid infinite loop][36721]
3925 * [Expand macros without recursing to avoid stack overflows][36214]
3930 * [Replace macro backtraces with labeled local uses][35702]
3931 * [Improve error message for misplaced doc comments][33922]
3932 * [Buffer unix and lock windows to prevent message interleaving][35975]
3933 * [Update lifetime errors to specifically note temporaries][36171]
3934 * [Special case a few colors for Windows][36178]
3935 * [Suggest `use self` when such an import resolves][36289]
3936 * [Be more specific when type parameter shadows primitive type][36338]
3937 * Many minor improvements
3939 Compile-time Optimizations
3940 --------------------------
3942 * [Compute and cache HIR hashes at beginning][35854]
3943 * [Don't hash types in loan paths][36004]
3944 * [Cache projections in trans][35761]
3945 * [Optimize the parser's last token handling][36527]
3946 * [Only instantiate #[inline] functions in codegen units referencing
3947 them][36524]. This leads to big improvements in cases where crates export
3948 define many inline functions without using them directly.
3949 * [Lazily allocate TypedArena's first chunk][36592]
3950 * [Don't allocate during default HashSet creation][36734]
3957 * [`overflowing_abs`]
3958 * [`RefCell::try_borrow`]
3959 * [`RefCell::try_borrow_mut`]
3964 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
3965 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
3967 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
3968 * [Implement `Debug` for `std::vec::IntoIter`][35707]
3969 * [`CString`: avoid excessive growth just to 0-terminate][35871]
3970 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
3971 * [Use arc4rand on FreeBSD][35884]
3972 * [memrchr: Correct aligned offset computation][35969]
3973 * [Improve Demangling of Rust Symbols][36059]
3974 * [Use monotonic time in condition variables][35048]
3975 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
3976 * [Implement conversion traits for `char`][35755]
3977 * [Fix illegal instruction caused by overflow in channel cloning][36104]
3978 * [Zero first byte of CString on drop][36264]
3979 * [Inherit overflow checks for sum and product][36372]
3980 * [Add missing Eq implementations][36423]
3981 * [Implement `Debug` for `DirEntry`][36631]
3982 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
3984 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3985 * [Implement more traits for `std::io::ErrorKind`][35911]
3986 * [Optimize BinaryHeap bounds checking][36072]
3987 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
3988 `extend_with_element`][36355]
3989 * [Fix overflow checking in unsigned pow()][34942]
3994 * This release includes security fixes to both curl and OpenSSL.
3995 * [Fix transitive doctests when panic=abort][cargo/3021]
3996 * [Add --all-features flag to cargo][cargo/3038]
3997 * [Reject path-based dependencies in `cargo package`][cargo/3060]
3998 * [Don't parse the home directory more than once][cargo/3078]
3999 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4000 * [Update OpenSSL to 1.0.2j][cargo/3121]
4001 * [Add license and license_file to cargo metadata output][cargo/3110]
4002 * [Make crates-io registry URL optional in config; ignore all changes to
4003 source.crates-io][cargo/3089]
4004 * [Don't download dependencies from other platforms][cargo/3123]
4005 * [Build transitive dev-dependencies when needed][cargo/3125]
4006 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
4007 * [Avoid updating registry when adding existing deps][cargo/3144]
4008 * [Warn about path overrides that won't work][cargo/3136]
4009 * [Use workspaces during `cargo install`][cargo/3146]
4010 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
4011 * [Add --message-format flag][cargo/3000]
4012 * [Pass target environment for rustdoc][cargo/3205]
4013 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
4014 * [Update curl and curl-sys][cargo/3241]
4015 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
4020 * [rustdoc: Add the `--sysroot` argument][36586]
4021 * [rustdoc: Fix a couple of issues with the search results][35655]
4022 * [rustdoc: remove the `!` from macro URLs and titles][35234]
4023 * [gdb: Fix pretty-printing special-cased Rust types][35585]
4024 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
4029 * [Remove unmaintained style guide][35124]
4030 * [Add s390x support][36369]
4031 * [Initial work at Haiku OS support][36727]
4032 * [Add mips-uclibc targets][35734]
4033 * [Crate-ify compiler-rt into compiler-builtins][35021]
4034 * [Add rustc version info (git hash + date) to dist tarball][36213]
4035 * Many documentation improvements
4040 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4041 * [Deny (by default) transmuting from fn item types to pointer-sized
4042 types][34923]. Continuing the long transition to zero-sized fn items,
4044 * [Fix `#[derive]` for empty tuple structs/variants][35728].
4046 * [Issue deprecation warnings for safe accesses to extern statics][36173]
4047 * [Fix lifetime rules for 'if' conditions][36029].
4048 * [Inherit overflow checks for sum and product][36372].
4049 * [Forbid user-defined macros named "macro_rules"][36730].
4051 [33922]: https://github.com/rust-lang/rust/pull/33922
4052 [34623]: https://github.com/rust-lang/rust/pull/34623
4053 [34923]: https://github.com/rust-lang/rust/pull/34923
4054 [34942]: https://github.com/rust-lang/rust/pull/34942
4055 [34982]: https://github.com/rust-lang/rust/pull/34982
4056 [35021]: https://github.com/rust-lang/rust/pull/35021
4057 [35048]: https://github.com/rust-lang/rust/pull/35048
4058 [35074]: https://github.com/rust-lang/rust/pull/35074
4059 [35124]: https://github.com/rust-lang/rust/pull/35124
4060 [35234]: https://github.com/rust-lang/rust/pull/35234
4061 [35238]: https://github.com/rust-lang/rust/pull/35238
4062 [35354]: https://github.com/rust-lang/rust/pull/35354
4063 [35559]: https://github.com/rust-lang/rust/pull/35559
4064 [35585]: https://github.com/rust-lang/rust/pull/35585
4065 [35627]: https://github.com/rust-lang/rust/pull/35627
4066 [35655]: https://github.com/rust-lang/rust/pull/35655
4067 [35702]: https://github.com/rust-lang/rust/pull/35702
4068 [35707]: https://github.com/rust-lang/rust/pull/35707
4069 [35728]: https://github.com/rust-lang/rust/pull/35728
4070 [35734]: https://github.com/rust-lang/rust/pull/35734
4071 [35755]: https://github.com/rust-lang/rust/pull/35755
4072 [35761]: https://github.com/rust-lang/rust/pull/35761
4073 [35764]: https://github.com/rust-lang/rust/pull/35764
4074 [35814]: https://github.com/rust-lang/rust/pull/35814
4075 [35854]: https://github.com/rust-lang/rust/pull/35854
4076 [35871]: https://github.com/rust-lang/rust/pull/35871
4077 [35884]: https://github.com/rust-lang/rust/pull/35884
4078 [35911]: https://github.com/rust-lang/rust/pull/35911
4079 [35969]: https://github.com/rust-lang/rust/pull/35969
4080 [35975]: https://github.com/rust-lang/rust/pull/35975
4081 [36004]: https://github.com/rust-lang/rust/pull/36004
4082 [36008]: https://github.com/rust-lang/rust/pull/36008
4083 [36014]: https://github.com/rust-lang/rust/pull/36014
4084 [36029]: https://github.com/rust-lang/rust/pull/36029
4085 [36059]: https://github.com/rust-lang/rust/pull/36059
4086 [36072]: https://github.com/rust-lang/rust/pull/36072
4087 [36101]: https://github.com/rust-lang/rust/pull/36101
4088 [36104]: https://github.com/rust-lang/rust/pull/36104
4089 [36171]: https://github.com/rust-lang/rust/pull/36171
4090 [36173]: https://github.com/rust-lang/rust/pull/36173
4091 [36178]: https://github.com/rust-lang/rust/pull/36178
4092 [36213]: https://github.com/rust-lang/rust/pull/36213
4093 [36214]: https://github.com/rust-lang/rust/pull/36214
4094 [36264]: https://github.com/rust-lang/rust/pull/36264
4095 [36266]: https://github.com/rust-lang/rust/pull/36266
4096 [36289]: https://github.com/rust-lang/rust/pull/36289
4097 [36338]: https://github.com/rust-lang/rust/pull/36338
4098 [36351]: https://github.com/rust-lang/rust/pull/36351
4099 [36355]: https://github.com/rust-lang/rust/pull/36355
4100 [36369]: https://github.com/rust-lang/rust/pull/36369
4101 [36372]: https://github.com/rust-lang/rust/pull/36372
4102 [36423]: https://github.com/rust-lang/rust/pull/36423
4103 [36482]: https://github.com/rust-lang/rust/pull/36482
4104 [36505]: https://github.com/rust-lang/rust/pull/36505
4105 [36524]: https://github.com/rust-lang/rust/pull/36524
4106 [36527]: https://github.com/rust-lang/rust/pull/36527
4107 [36551]: https://github.com/rust-lang/rust/pull/36551
4108 [36574]: https://github.com/rust-lang/rust/pull/36574
4109 [36586]: https://github.com/rust-lang/rust/pull/36586
4110 [36592]: https://github.com/rust-lang/rust/pull/36592
4111 [36631]: https://github.com/rust-lang/rust/pull/36631
4112 [36639]: https://github.com/rust-lang/rust/pull/36639
4113 [36721]: https://github.com/rust-lang/rust/pull/36721
4114 [36727]: https://github.com/rust-lang/rust/pull/36727
4115 [36730]: https://github.com/rust-lang/rust/pull/36730
4116 [36734]: https://github.com/rust-lang/rust/pull/36734
4117 [36754]: https://github.com/rust-lang/rust/pull/36754
4118 [36995]: https://github.com/rust-lang/rust/pull/36995
4119 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
4120 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
4121 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4122 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
4123 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
4124 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
4125 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
4126 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
4127 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
4128 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
4129 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
4130 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
4131 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
4132 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
4133 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
4134 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
4135 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
4136 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
4137 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
4138 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
4139 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
4140 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
4141 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
4142 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
4143 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
4144 [rustup]: https://www.rustup.rs
4145 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
4146 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
4147 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
4148 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
4149 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
4150 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
4151 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
4154 Version 1.12.1 (2016-10-20)
4155 ===========================
4160 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
4161 * [Confusion with double negation and booleans][36856]
4162 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
4163 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
4164 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
4165 * [Corrupted memory after updated to 1.12][36936]
4166 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
4167 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
4168 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
4170 [36381]: https://github.com/rust-lang/rust/issues/36381
4171 [36856]: https://github.com/rust-lang/rust/issues/36856
4172 [36875]: https://github.com/rust-lang/rust/issues/36875
4173 [36924]: https://github.com/rust-lang/rust/issues/36924
4174 [36926]: https://github.com/rust-lang/rust/issues/36926
4175 [36936]: https://github.com/rust-lang/rust/issues/36936
4176 [37026]: https://github.com/rust-lang/rust/issues/37026
4177 [37112]: https://github.com/rust-lang/rust/issues/37112
4178 [37153]: https://github.com/rust-lang/rust/issues/37153
4181 Version 1.12.0 (2016-09-29)
4182 ===========================
4187 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4188 This translation pass is far simpler than the previous AST->LLVM pass, and
4189 creates opportunities to perform new optimizations directly on the MIR. It
4190 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4191 * [`rustc` presents a new, more readable error format, along with
4192 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4193 Most common editors supporting Rust have been updated to work with it. It was
4194 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4199 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4200 This translation pass is far simpler than the previous AST->LLVM pass, and
4201 creates opportunities to perform new optimizations directly on the MIR. It
4202 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4203 * [Print the Rust target name, not the LLVM target name, with
4204 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
4205 * [The computation of `TypeId` is correct in some cases where it was previously
4206 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
4207 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
4208 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
4209 `--print relocation-models`, and `--print code-models` print the available
4210 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
4211 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
4212 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
4213 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
4214 These targets produce statically-linked binaries. There are no binary release
4220 * [`rustc` presents a new, more readable error format, along with
4221 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4222 Most common editors supporting Rust have been updated to work with it. It was
4223 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4224 * [In error descriptions, references are now described in plain English,
4225 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
4226 * [In error type descriptions, unknown numeric types are named `{integer}` or
4227 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
4228 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
4233 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
4234 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
4235 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
4236 useful](https://github.com/rust-lang/rust/pull/34908)
4237 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
4238 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
4239 * [Semicolons are properly required as statement delimiters inside
4240 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
4241 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4246 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
4247 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
4248 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
4249 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
4250 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
4251 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
4252 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
4253 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
4254 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
4255 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
4256 Both on Unix and Windows.
4257 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
4258 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
4259 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
4260 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
4261 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
4262 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
4263 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
4264 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
4269 * [The `format!` macro and friends now allow a single argument to be formatted
4270 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
4271 * [The lifetime bounds on `[T]::binary_search_by` and
4272 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
4273 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
4274 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
4275 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
4276 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
4277 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
4278 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
4279 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
4280 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
4281 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
4282 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
4283 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
4284 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
4285 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
4286 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
4287 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
4288 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
4289 * [`mpsc::sync_channel` `Receiver`s return any available message before
4290 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
4291 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
4292 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
4297 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
4298 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
4299 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
4300 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
4301 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
4302 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
4303 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
4304 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
4305 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
4306 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
4307 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
4308 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
4309 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
4310 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
4311 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
4312 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
4317 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
4318 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
4323 * [Test binaries now support a `--test-threads` argument to specify the number
4324 of threads used to run tests, and which acts the same as the
4325 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
4326 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
4327 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
4328 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4329 * [Rust releases now come with source packages that can be installed by rustup
4330 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
4331 The resulting source code can be used by tools and IDES, located in the
4332 sysroot under `lib/rustlib/src`.
4337 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
4338 * Many minor improvements to the documentation.
4339 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
4344 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
4345 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
4346 * [When formatting strings, if "precision" is specified, the "fill",
4347 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
4348 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
4351 Version 1.11.0 (2016-08-18)
4352 ===========================
4357 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4358 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
4359 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
4360 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
4361 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
4366 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
4367 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
4368 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
4369 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
4370 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
4371 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
4372 (in libcore - previously stabilized in libstd)
4373 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
4374 (in libcore - previously stabilized in libstd)
4375 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
4376 (in libcore - previously stabilized in libstd)
4377 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
4378 (in libcore - previously stabilized in libstd)
4379 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4380 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4381 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
4382 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
4387 * [The `thread_local!` macro supports multiple definitions in a single
4388 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
4389 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
4390 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
4391 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
4392 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
4393 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
4394 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
4395 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
4400 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
4401 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
4402 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
4403 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
4404 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
4405 and `-vv` prints warnings for all crates.
4406 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
4407 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
4408 This provides room for expansion by arbitrary tools.
4409 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
4410 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
4411 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
4412 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
4413 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
4414 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
4415 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
4420 * [Caching projections speeds up type check dramatically for some
4421 workloads](https://github.com/rust-lang/rust/pull/33816)
4422 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
4423 This hasher is faster, but is believed to provide sufficient
4424 protection from collision attacks.
4425 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
4430 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
4431 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
4432 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
4433 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
4434 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
4439 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
4440 * [When emitting debug info, rustc emits frame pointers for closures,
4441 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
4442 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4443 * Many more errors have been given error codes and extended
4445 * API documentation continues to be improved, with many new examples
4450 * [rustc no longer hangs when dependencies recursively re-export
4451 submodules](https://github.com/rust-lang/rust/pull/34542)
4452 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
4453 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
4454 rewritten](https://github.com/rust-lang/rust/pull/33895)
4455 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
4456 No targets use this yet, but it works toward AVR support.
4461 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
4462 * [The new follow-set rules that place restrictions on `macro_rules!`
4463 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
4464 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
4465 and has been a warning since 1.10.
4466 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
4467 This causes breakage in some corner cases.
4470 Version 1.10.0 (2016-07-07)
4471 ===========================
4476 * [Allow `concat_idents!` in type positions as well as in expression
4477 positions](https://github.com/rust-lang/rust/pull/33735).
4478 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
4479 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
4480 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
4481 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
4482 * [`panic!` can be converted to a runtime abort with the
4483 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
4484 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4485 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
4486 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
4487 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
4488 Note that Cargo does not yet directly support cdylibs.
4493 * `os::windows::fs::OpenOptionsExt::access_mode`
4494 * `os::windows::fs::OpenOptionsExt::share_mode`
4495 * `os::windows::fs::OpenOptionsExt::custom_flags`
4496 * `os::windows::fs::OpenOptionsExt::attributes`
4497 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
4498 * `os::unix::fs::OpenOptionsExt::custom_flags`
4499 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
4500 * `Default for sync::Weak`
4501 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
4502 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
4503 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
4504 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
4505 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
4506 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
4507 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
4508 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
4509 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
4510 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
4511 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
4512 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
4513 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
4514 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
4515 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
4516 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
4517 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
4518 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
4519 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
4520 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
4521 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
4522 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
4523 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
4524 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
4525 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
4526 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4527 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4528 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4529 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4530 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
4531 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
4532 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
4533 * Read/Write/RawFd impls for `UnixStream`
4534 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
4535 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
4536 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
4537 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
4538 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
4539 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
4540 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
4541 * RawFd impls for `UnixListener`
4542 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
4543 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
4544 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
4545 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
4546 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
4547 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
4548 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
4549 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
4550 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
4551 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
4552 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
4553 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
4554 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
4555 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
4556 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
4557 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
4558 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
4559 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
4560 * RawFd impls for `UnixDatagram`
4561 * `{BTree,Hash}Map::values_mut`
4562 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
4567 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
4568 The semantics of this minor method are subtle and probably not what
4570 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
4571 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
4572 will fall back to `/dev/urandom` temporarily to avoid blocking
4573 during early boot](https://github.com/rust-lang/rust/pull/33086).
4574 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
4575 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
4576 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
4577 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
4578 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
4579 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
4580 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
4584 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
4585 This controls the runtime behavior of the `panic!` macro
4586 and can be either "unwind" (the default), or "abort".
4587 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4588 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
4589 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
4590 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
4591 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
4592 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
4593 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
4594 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
4595 By default they are retried twice, which can be customized with the
4596 `net.retry` value in `.cargo/config`.
4597 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
4598 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
4599 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
4600 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
4601 Makes it possible to install multiple crates in parallel.
4602 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
4603 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
4604 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
4605 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
4606 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
4607 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
4612 * [rustc memory usage was reduced by refactoring the context used for
4613 type checking](https://github.com/rust-lang/rust/pull/33425).
4614 * [Speed up creation of `HashMap`s by caching the random keys used
4615 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
4616 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
4617 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
4618 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
4619 10x faster than the previous lookup tables.
4620 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
4625 * Many incremental improvements to documentation and rustdoc.
4626 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
4627 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
4628 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
4629 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
4630 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
4631 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
4632 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
4637 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
4638 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
4639 * [`std` no longer prints backtraces on platforms where the running
4640 module must be loaded with `env::current_exe`, which can't be relied
4641 on](https://github.com/rust-lang/rust/pull/33554).
4642 * This release includes std binaries for the i586-unknown-linux-gnu,
4643 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
4644 i586 target is for old x86 hardware without SSE2, and the armv7
4645 target is for Android running on modern ARM architectures.
4646 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
4647 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
4648 * [On Unix the runtime aborts by calling `libc::abort` instead of
4649 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
4650 * [Rust is now bootstrapped from the previous release of Rust,
4651 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
4656 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
4657 * [`target_env` for Linux ARM targets is just `gnu`, not
4658 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
4659 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
4660 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
4661 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
4662 Affects how macros are parsed.
4663 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
4664 * [Feature-gated attributes on macro-generated macro invocations are
4665 now rejected](https://github.com/rust-lang/rust/pull/32791).
4666 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
4667 This caused some minor changes to type inference.
4670 Version 1.9.0 (2016-05-26)
4671 ==========================
4676 * The `#[deprecated]` attribute when applied to an API will generate
4677 warnings when used. The warnings may be suppressed with
4678 `#[allow(deprecated)]`. [RFC 1270].
4679 * [`fn` item types are zero sized, and each `fn` names a unique
4680 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4681 `transmute` on a `fn` type will generate a warning for a few cycles,
4682 then will be converted to an error.
4683 * [Field and method resolution understand visibility, so private
4684 fields and methods cannot prevent the proper use of public fields
4685 and methods][1.9fv].
4686 * [The parser considers unicode codepoints in the
4687 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
4693 * [`std::panic::catch_unwind`][] (renamed from `recover`)
4694 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
4695 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
4696 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
4697 * [`str::is_char_boundary`]
4698 * [`<*const T>::as_ref`]
4699 * [`<*mut T>::as_ref`]
4700 * [`<*mut T>::as_mut`]
4701 * [`AsciiExt::make_ascii_uppercase`]
4702 * [`AsciiExt::make_ascii_lowercase`]
4703 * [`char::decode_utf16`]
4704 * [`char::DecodeUtf16`]
4705 * [`char::DecodeUtf16Error`]
4706 * [`char::DecodeUtf16Error::unpaired_surrogate`]
4707 * [`BTreeSet::take`]
4708 * [`BTreeSet::replace`]
4711 * [`HashSet::replace`]
4713 * [`OsString::with_capacity`]
4714 * [`OsString::clear`]
4715 * [`OsString::capacity`]
4716 * [`OsString::reserve`]
4717 * [`OsString::reserve_exact`]
4718 * [`OsStr::is_empty`]
4720 * [`std::os::unix::thread`]
4723 * [`JoinHandleExt::as_pthread_t`]
4724 * [`JoinHandleExt::into_pthread_t`]
4725 * [`HashSet::hasher`]
4726 * [`HashMap::hasher`]
4727 * [`CommandExt::exec`]
4728 * [`File::try_clone`]
4729 * [`SocketAddr::set_ip`]
4730 * [`SocketAddr::set_port`]
4731 * [`SocketAddrV4::set_ip`]
4732 * [`SocketAddrV4::set_port`]
4733 * [`SocketAddrV6::set_ip`]
4734 * [`SocketAddrV6::set_port`]
4735 * [`SocketAddrV6::set_flowinfo`]
4736 * [`SocketAddrV6::set_scope_id`]
4737 * [`slice::copy_from_slice`]
4738 * [`ptr::read_volatile`]
4739 * [`ptr::write_volatile`]
4740 * [`OpenOptions::create_new`]
4741 * [`TcpStream::set_nodelay`]
4742 * [`TcpStream::nodelay`]
4743 * [`TcpStream::set_ttl`]
4744 * [`TcpStream::ttl`]
4745 * [`TcpStream::set_only_v6`]
4746 * [`TcpStream::only_v6`]
4747 * [`TcpStream::take_error`]
4748 * [`TcpStream::set_nonblocking`]
4749 * [`TcpListener::set_ttl`]
4750 * [`TcpListener::ttl`]
4751 * [`TcpListener::set_only_v6`]
4752 * [`TcpListener::only_v6`]
4753 * [`TcpListener::take_error`]
4754 * [`TcpListener::set_nonblocking`]
4755 * [`UdpSocket::set_broadcast`]
4756 * [`UdpSocket::broadcast`]
4757 * [`UdpSocket::set_multicast_loop_v4`]
4758 * [`UdpSocket::multicast_loop_v4`]
4759 * [`UdpSocket::set_multicast_ttl_v4`]
4760 * [`UdpSocket::multicast_ttl_v4`]
4761 * [`UdpSocket::set_multicast_loop_v6`]
4762 * [`UdpSocket::multicast_loop_v6`]
4763 * [`UdpSocket::set_multicast_ttl_v6`]
4764 * [`UdpSocket::multicast_ttl_v6`]
4765 * [`UdpSocket::set_ttl`]
4766 * [`UdpSocket::ttl`]
4767 * [`UdpSocket::set_only_v6`]
4768 * [`UdpSocket::only_v6`]
4769 * [`UdpSocket::join_multicast_v4`]
4770 * [`UdpSocket::join_multicast_v6`]
4771 * [`UdpSocket::leave_multicast_v4`]
4772 * [`UdpSocket::leave_multicast_v6`]
4773 * [`UdpSocket::take_error`]
4774 * [`UdpSocket::connect`]
4775 * [`UdpSocket::send`]
4776 * [`UdpSocket::recv`]
4777 * [`UdpSocket::set_nonblocking`]
4782 * [`std::sync::Once` is poisoned if its initialization function
4784 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4785 * [Most types implement `fmt::Debug`][1.9db].
4786 * [The default buffer size used by `BufReader` and `BufWriter` was
4787 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4788 used by other languages.
4789 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4790 `Duration` additionally implements `*=` and `/=`][1.9ta].
4791 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4792 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4793 * [`Chain` implements `BufRead`][1.9ch].
4794 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4799 * [Cargo can now run concurrently][1.9cc].
4800 * [Top-level overrides allow specific revisions of crates to be
4801 overridden through the entire crate graph][1.9ct]. This is intended
4802 to make upgrades easier for large projects, by allowing crates to be
4803 forked temporarily until they've been upgraded and republished.
4804 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4805 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4806 on the commandline][1.9cf]. `rustc` arguments can also be specified
4807 in the `build.rustflags` configuration key.
4812 * [The time complexity of comparing variables for equivalence during type
4813 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4814 to major compilation time improvement in some scenarios.
4815 * [`ToString` is specialized for `str`, giving it the same performance
4816 as `to_owned`][1.9ts].
4817 * [Spawning processes with `Command::output` no longer creates extra
4819 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4820 for C-like enums][1.9cl].
4825 * [Passing the `--quiet` flag to a test runner will produce
4826 much-abbreviated output][1.9q].
4827 * The Rust Project now publishes std binaries for the
4828 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4829 `i586-pc-windows-msvc` targets.
4834 * [`std::sync::Once` is poisoned if its initialization function
4836 * [It is illegal to define methods with the same name in overlapping
4837 inherent `impl` blocks][1.9sn].
4838 * [`fn` item types are zero sized, and each `fn` names a unique
4839 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4840 `transmute` on a `fn` type will generate a warning for a few cycles,
4841 then will be converted to an error.
4842 * [Improvements to const evaluation may trigger new errors when integer
4843 literals are out of range][1.9ce].
4846 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4847 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4848 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4849 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4850 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4851 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4852 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4853 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4854 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4855 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4856 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4857 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4858 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4859 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4860 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4861 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4862 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4863 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4864 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4865 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4866 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4867 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4868 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4869 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4870 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4871 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4872 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4873 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4874 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4875 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
4876 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
4877 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
4878 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
4879 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
4880 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
4881 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
4882 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
4883 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
4884 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
4885 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
4886 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
4887 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
4888 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
4889 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
4890 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
4891 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
4892 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
4893 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
4894 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
4895 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
4896 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
4897 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
4898 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
4899 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
4900 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
4901 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
4902 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
4903 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
4904 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
4905 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
4906 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4907 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4908 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4909 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4910 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4911 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4912 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
4913 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4914 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
4915 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4916 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4917 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4918 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4919 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4920 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
4921 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
4922 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
4923 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
4924 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
4925 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
4926 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
4927 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
4928 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
4929 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
4930 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
4931 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
4932 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
4933 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
4934 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
4935 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
4936 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
4937 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
4938 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
4939 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
4940 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
4941 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
4942 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
4943 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
4944 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
4945 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
4946 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
4947 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
4948 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
4949 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
4950 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
4951 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
4952 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
4953 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
4954 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
4955 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
4958 Version 1.8.0 (2016-04-14)
4959 ==========================
4964 * Rust supports overloading of compound assignment statements like
4965 `+=` by implementing the [`AddAssign`], [`SubAssign`],
4966 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
4967 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
4969 * Empty structs can be defined with braces, as in `struct Foo { }`, in
4970 addition to the non-braced form, `struct Foo;`. [RFC 218].
4976 * [`str::encode_utf16`][] (renamed from `utf16_units`)
4977 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
4980 * [`ptr::drop_in_place`]
4982 * [`time::SystemTime`]
4984 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
4985 * [`Instant::elapsed`]
4986 * [`SystemTime::now`]
4987 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
4988 * [`SystemTime::elapsed`]
4989 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
4990 * [`SystemTimeError`]
4991 * [`SystemTimeError::duration`]
4992 * Various impls for `SystemTimeError`
4994 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
4995 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
4996 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
4997 * [The `write!` and `writeln!` macros correctly emit errors if any of
4998 their arguments can't be formatted][1.8w].
4999 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5000 * [The Unix-specific `raw` modules, which contain a number of
5001 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5002 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5003 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5004 across platforms was making it difficult to implement `std`
5005 correctly. Those that need these definitions should use the `libc`
5007 * The Unix-specific `MetadataExt` traits, including
5008 `os::unix::fs::MetadataExt`, which expose values such as inode
5009 numbers [no longer return platform-specific types][1.8r], but
5010 instead return widened integers. [RFC 1415].
5011 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
5012 * [Atomic loads and stores are not volatile][1.8a].
5013 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
5018 * [Inlining hash functions lead to a 3% compile-time improvement in
5019 some workloads][1.8h].
5020 * When using jemalloc, its symbols are [unprefixed so that it
5021 overrides the libc malloc implementation][1.8h]. This means that for
5022 rustc, LLVM is now using jemalloc, which results in a 6%
5023 compile-time improvement on a specific workload.
5024 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
5029 * [32-bit MSVC builds finally implement unwinding][1.8ms].
5030 i686-pc-windows-msvc is now considered a tier-1 platform.
5031 * [The `--print targets` flag prints a list of supported targets][1.8t].
5032 * [The `--print cfg` flag prints the `cfg`s defined for the current
5034 * [`rustc` can be built with an new Cargo-based build system, written
5035 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
5036 build system. To enable it configure with `configure --rustbuild`.
5037 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
5038 variants while also indicating the total number of missing variants
5039 if more than 3][1.8m].
5040 * [Executable stacks are disabled on Linux and BSD][1.8nx].
5041 * The Rust Project now publishes binary releases of the standard
5042 library for a number of tier-2 targets:
5043 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
5044 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
5045 `x86_64-rumprun-netbsd`. These can be installed with
5046 tools such as [multirust][1.8mr].
5051 * [`cargo init` creates a new Cargo project in the current
5052 directory][1.8ci]. It is otherwise like `cargo new`.
5053 * [Cargo has configuration keys for `-v` and
5054 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
5055 `[term]` section of `.cargo/config`.
5056 * [Configuration keys that evaluate to strings or integers can be set
5057 via environment variables][1.8ce]. For example the `build.jobs` key
5058 can be set via `CARGO_BUILD_JOBS`. Environment variables take
5059 precedence over config files.
5060 * [Target-specific dependencies support Rust `cfg` syntax for
5061 describing targets][1.8cfg] so that dependencies for multiple
5062 targets can be specified together. [RFC 1361].
5063 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
5064 `RUSTDOC` take precedence over the `build.target-dir`,
5065 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
5066 * [The child process tree is killed on Windows when Cargo is
5068 * [The `build.target` configuration value sets the target platform,
5069 like `--target`][1.8ct].
5074 * [Unstable compiler flags have been further restricted][1.8u]. Since
5075 1.0 `-Z` flags have been considered unstable, and other flags that
5076 were considered unstable additionally required passing `-Z
5077 unstable-options` to access. Unlike unstable language and library
5078 features though, these options have been accessible on the stable
5079 release channel. Going forward, *new unstable flags will not be
5080 available on the stable release channel*, and old unstable flags
5081 will warn about their usage. In the future, all unstable flags will
5082 be unavailable on the stable release channel.
5083 * [It is no longer possible to `match` on empty enum variants using
5084 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
5085 * The Unix-specific `MetadataExt` traits, including
5086 `os::unix::fs::MetadataExt`, which expose values such as inode
5087 numbers [no longer return platform-specific types][1.8r], but
5088 instead return widened integers. [RFC 1415].
5089 * [Modules sourced from the filesystem cannot appear within arbitrary
5090 blocks, but only within other modules][1.8mf].
5091 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
5092 * On Unix, [stack overflow triggers a runtime abort instead of a
5094 * [`Command::spawn` and its equivalents return an error if any of
5095 its command-line arguments contain interior `NUL`s][1.8n].
5096 * [Tuple and unit enum variants from other crates are in the type
5098 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
5099 type instead of `.a` files][1.8st]. Additionally, for the MSVC
5100 toolchain, `rustc` emits import libraries named `foo.dll.lib`
5101 instead of `foo.lib`.
5104 [1.8a]: https://github.com/rust-lang/rust/pull/30962
5105 [1.8b]: https://github.com/rust-lang/rust/pull/31123
5106 [1.8c]: https://github.com/rust-lang/rust/pull/31530
5107 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
5108 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
5109 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
5110 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
5111 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
5112 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
5113 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
5114 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
5115 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
5116 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
5117 [1.8h]: https://github.com/rust-lang/rust/pull/31460
5118 [1.8l]: https://github.com/rust-lang/rust/pull/31668
5119 [1.8m]: https://github.com/rust-lang/rust/pull/31020
5120 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
5121 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
5122 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
5123 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
5124 [1.8n]: https://github.com/rust-lang/rust/pull/31056
5125 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
5126 [1.8r]: https://github.com/rust-lang/rust/pull/31551
5127 [1.8so]: https://github.com/rust-lang/rust/pull/31333
5128 [1.8st]: https://github.com/rust-lang/rust/pull/29520
5129 [1.8t]: https://github.com/rust-lang/rust/pull/31358
5130 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
5131 [1.8u]: https://github.com/rust-lang/rust/pull/31793
5132 [1.8v]: https://github.com/rust-lang/rust/pull/31757
5133 [1.8w]: https://github.com/rust-lang/rust/pull/31904
5134 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
5135 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
5136 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
5137 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
5138 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
5139 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
5140 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
5141 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
5142 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
5143 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
5144 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
5145 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
5146 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
5147 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
5148 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
5149 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
5150 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
5151 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
5152 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
5153 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
5154 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
5155 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
5156 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
5157 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
5158 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
5159 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
5160 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
5161 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
5162 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
5163 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
5166 Version 1.7.0 (2016-03-03)
5167 ==========================
5174 * [`Path::strip_prefix`][] (renamed from relative_from)
5175 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
5177 * [`Ipv4Addr::is_loopback`]
5178 * [`Ipv4Addr::is_private`]
5179 * [`Ipv4Addr::is_link_local`]
5180 * [`Ipv4Addr::is_multicast`]
5181 * [`Ipv4Addr::is_broadcast`]
5182 * [`Ipv4Addr::is_documentation`]
5184 * [`Ipv6Addr::is_unspecified`]
5185 * [`Ipv6Addr::is_loopback`]
5186 * [`Ipv6Addr::is_multicast`]
5189 * [`Vec::as_mut_slice`]
5191 * [`String::as_str`]
5192 * [`String::as_mut_str`]
5194 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
5196 * `<[T]>::`[`sort_by_key`]
5197 * checked, saturated, and overflowing operations
5198 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
5199 * [`i32::saturating_mul`]
5200 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
5201 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
5202 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
5203 * [`u32::saturating_mul`]
5204 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
5205 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
5206 * and checked, saturated, and overflowing operations for other primitive types
5208 * [`ffi::IntoStringError`]
5209 * [`CString::into_string`]
5210 * [`CString::into_bytes`]
5211 * [`CString::into_bytes_with_nul`]
5212 * `From<CString> for Vec<u8>`
5214 * [`IntoStringError::into_cstring`]
5215 * [`IntoStringError::utf8_error`]
5216 * `Error for IntoStringError`
5218 * [`std::hash::BuildHasher`]
5219 * [`BuildHasher::Hasher`]
5220 * [`BuildHasher::build_hasher`]
5221 * [`std::hash::BuildHasherDefault`]
5222 * [`HashMap::with_hasher`]
5223 * [`HashMap::with_capacity_and_hasher`]
5224 * [`HashSet::with_hasher`]
5225 * [`HashSet::with_capacity_and_hasher`]
5226 * [`std::collections::hash_map::RandomState`]
5227 * [`RandomState::new`]
5228 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
5229 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
5230 from bytes is faster.
5231 * [The performance of `LineWriter` (and thus `io::stdout`) was
5232 improved by using `memchr` to search for newlines][1.7m].
5233 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
5234 `f64` variants were stabilized previously.
5235 * [`BTreeMap` was rewritten to use less memory and improve the performance
5236 of insertion and iteration, the latter by as much as 5x][1.7bm].
5237 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
5238 covariant over their contained type][1.7bt].
5239 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
5240 over their contained type][1.7ll].
5241 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
5243 * [`Any` is implemented for unsized types][1.7a].
5244 * [`Hash` is implemented for `Duration`][1.7h].
5249 * [When running tests with `--test`, rustdoc will pass `--cfg`
5250 arguments to the compiler][1.7dt].
5251 * [The compiler is built with RPATH information by default][1.7rpa].
5252 This means that it will be possible to run `rustc` when installed in
5253 unusual configurations without configuring the dynamic linker search
5255 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
5256 any RPATH entries (emitted with `-C rpath`) *not* take precedence
5257 over `LD_LIBRARY_PATH`.
5262 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
5263 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
5264 * [The `rerun-if-changed` build script directive no longer causes the
5265 build script to incorrectly run twice in certain scenarios][1.7rr].
5270 * Soundness fixes to the interactions between associated types and
5271 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
5272 code that violates the new rules. This is a significant change that
5273 is known to break existing code, so it has emitted warnings for the
5274 new error cases since 1.4 to give crate authors time to adapt. The
5275 details of what is changing are subtle; read the RFC for more.
5276 * [Several bugs in the compiler's visibility calculations were
5277 fixed][1.7v]. Since this was found to break significant amounts of
5278 code, the new errors will be emitted as warnings for several release
5279 cycles, under the `private_in_public` lint.
5280 * Defaulted type parameters were accidentally accepted in positions
5281 that were not intended. In this release, [defaulted type parameters
5282 appearing outside of type definitions will generate a
5283 warning][1.7d], which will become an error in future releases.
5284 * [Parsing "." as a float results in an error instead of 0][1.7p].
5285 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
5286 * [Borrows of closure parameters may not outlive the closure][1.7bc].
5288 [1.7a]: https://github.com/rust-lang/rust/pull/30928
5289 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
5290 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
5291 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
5292 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
5293 [1.7d]: https://github.com/rust-lang/rust/pull/30724
5294 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
5295 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
5296 [1.7f]: https://github.com/rust-lang/rust/pull/30672
5297 [1.7h]: https://github.com/rust-lang/rust/pull/30818
5298 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
5299 [1.7m]: https://github.com/rust-lang/rust/pull/30381
5300 [1.7p]: https://github.com/rust-lang/rust/pull/30681
5301 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
5302 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
5303 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
5304 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
5305 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
5306 [1.7v]: https://github.com/rust-lang/rust/pull/29973
5307 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5308 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5309 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
5310 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
5311 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
5312 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
5313 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
5314 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
5315 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
5316 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
5317 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
5318 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
5319 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
5320 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
5321 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
5322 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
5323 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
5324 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
5325 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
5326 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
5327 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
5328 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
5329 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
5330 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
5331 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
5332 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
5333 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
5334 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
5335 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
5336 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
5337 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
5338 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
5339 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
5340 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
5341 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
5342 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
5343 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
5344 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
5345 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
5346 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
5347 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
5348 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
5349 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
5350 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
5351 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
5352 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
5353 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
5354 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5355 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
5356 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5357 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
5358 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
5359 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
5360 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
5361 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
5362 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
5363 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
5364 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
5365 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
5366 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
5369 Version 1.6.0 (2016-01-21)
5370 ==========================
5375 * The `#![no_std]` attribute causes a crate to not be linked to the
5376 standard library, but only the [core library][1.6co], as described
5377 in [RFC 1184]. The core library defines common types and traits but
5378 has no platform dependencies whatsoever, and is the basis for Rust
5379 software in environments that cannot support a full port of the
5380 standard library, such as operating systems. Most of the core
5381 library is now stable.
5387 [`Read::read_exact`],
5388 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
5389 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
5390 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
5391 [`os::unix::fs::DirBuilderExt`],
5392 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
5393 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
5394 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
5395 [`collections::hash_map::Drain`],
5396 [`collections::hash_map::HashMap::drain`],
5397 [`collections::hash_set::Drain`],
5398 [`collections::hash_set::HashSet::drain`],
5399 [`collections::binary_heap::Drain`],
5400 [`collections::binary_heap::BinaryHeap::drain`],
5401 [`Vec::extend_from_slice`][] (renamed from `push_all`),
5402 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
5403 [`RwLock::into_inner`],
5404 [`Iterator::min_by_key`][] (renamed from `min_by`),
5405 [`Iterator::max_by_key`][] (renamed from `max_by`).
5406 * The [core library][1.6co] is stable, as are most of its APIs.
5407 * [The `assert_eq!` macro supports arguments that don't implement
5408 `Sized`][1.6ae], such as arrays. In this way it behaves more like
5410 * Several timer functions that take duration in milliseconds [are
5411 deprecated in favor of those that take `Duration`][1.6ms]. These
5412 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
5413 `thread::park_timeout_ms`.
5414 * The algorithm by which `Vec` reserves additional elements was
5415 [tweaked to not allocate excessive space][1.6a] while still growing
5417 * `From` conversions are [implemented from integers to floats][1.6f]
5418 in cases where the conversion is lossless. Thus they are not
5419 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
5420 or `f64`. They are also not implemented for `isize` and `usize`
5421 because the implementations would be platform-specific. `From` is
5422 also implemented from `f32` to `f64`.
5423 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
5424 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
5425 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
5426 * [`BinaryHeap` was refactored][1.6bh] for modest performance
5428 * Sorting slices that are already sorted [is 50% faster in some
5434 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
5435 * Cargo build scripts can specify their dependencies by emitting the
5436 [`rerun-if-changed`][1.6rr] key.
5437 * crates.io will reject publication of crates with dependencies that
5438 have a wildcard version constraint. Crates with wildcard
5439 dependencies were seen to cause a variety of problems, as described
5440 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
5442 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
5443 release folder. A variety of artifacts that Cargo failed to clean
5444 are now correctly deleted.
5449 * The `unreachable_code` lint [warns when a function call's argument
5451 * The parser indicates [failures that may be caused by
5452 confusingly-similar Unicode characters][1.6uc]
5453 * Certain macro errors [are reported at definition time][1.6m], not
5459 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
5460 environment variable when locating crates. This was a pre-cargo
5461 feature for integrating with the package manager that was
5462 accidentally never removed.
5463 * [A number of bugs were fixed in the privacy checker][1.6p] that
5464 could cause previously-accepted code to break.
5465 * [Modules and unit/tuple structs may not share the same name][1.6ts].
5466 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
5467 struct pattern syntax (`Foo(..)`) can no longer be used to match
5468 unit structs. This is a warning now, but will become an error in
5469 future releases. Patterns that share the same name as a const are
5471 * A bug was fixed that causes [rustc not to apply default type
5472 parameters][1.6xc] when resolving certain method implementations of
5473 traits defined in other crates.
5475 [1.6a]: https://github.com/rust-lang/rust/pull/29454
5476 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
5477 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
5478 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
5479 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
5480 [1.6co]: http://doc.rust-lang.org/core/index.html
5481 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
5482 [1.6f]: https://github.com/rust-lang/rust/pull/29129
5483 [1.6m]: https://github.com/rust-lang/rust/pull/29828
5484 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
5485 [1.6p]: https://github.com/rust-lang/rust/pull/29726
5486 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
5487 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
5488 [1.6s]: https://github.com/rust-lang/rust/pull/29675
5489 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
5490 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
5491 [1.6us]: https://github.com/rust-lang/rust/pull/29383
5492 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
5493 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
5494 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5495 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
5496 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
5497 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
5498 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
5499 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
5500 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
5501 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
5502 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
5503 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
5504 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
5505 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
5506 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
5507 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
5508 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
5509 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
5510 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
5511 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
5512 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
5513 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
5514 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
5515 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
5516 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
5517 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
5518 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
5519 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
5520 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
5521 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
5524 Version 1.5.0 (2015-12-10)
5525 ==========================
5527 * ~700 changes, numerous bugfixes
5533 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
5534 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
5535 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
5536 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
5537 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
5538 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
5539 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
5540 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
5541 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
5542 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
5543 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
5544 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
5545 [`Path::read_link`], [`Path::symlink_metadata`],
5546 [`Utf8Error::valid_up_to`], [`Vec::resize`],
5547 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
5548 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
5549 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
5550 [`slice::split_first_mut`], [`slice::split_first`],
5551 [`slice::split_last_mut`], [`slice::split_last`],
5552 [`char::from_u32_unchecked`], [`fs::canonicalize`],
5553 [`str::MatchIndices`], [`str::RMatchIndices`],
5554 [`str::match_indices`], [`str::rmatch_indices`],
5555 [`str::slice_mut_unchecked`], [`string::ParseError`].
5556 * Rust applications hosted on crates.io can be installed locally to
5557 `~/.cargo/bin` with the [`cargo install`] command. Among other
5558 things this makes it easier to augment Cargo with new subcommands:
5559 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
5560 invoked as `cargo foo`.
5561 * Crates with wildcard (`*`) dependencies will [emit warnings when
5562 published][1.5w]. In 1.6 it will no longer be possible to publish
5563 crates with wildcard dependencies.
5568 * The rules determining when a particular lifetime must outlive
5569 a particular value (known as '[dropck]') have been [modified
5570 to not rely on parametricity][1.5p].
5571 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
5572 and `Arc`][1.5a]. Because these smart pointer types implement
5573 `Deref`, this causes breakage in cases where the interior type
5574 contains methods of the same name.
5575 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
5576 that they could drop their content. Soundness fix.
5577 * All method invocations are [properly checked][1.5wf1] for
5578 [well-formedness][1.5wf2]. Soundness fix.
5579 * Traits whose supertraits contain `Self` are [not object
5580 safe][1.5o]. Soundness fix.
5581 * Target specifications support a [`no_default_libraries`][1.5nd]
5582 setting that controls whether `-nodefaultlibs` is passed to the
5583 linker, and in turn the `is_like_windows` setting no longer affects
5584 the `-nodefaultlibs` flag.
5585 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
5586 * The `#[inline]` and `#[repr]` attributes [can only appear
5587 in valid locations][1.5at].
5588 * Native libraries linked from the local crate are [passed to
5589 the linker before native libraries from upstream crates][1.5nl].
5590 * Two rarely-used attributes, `#[no_debug]` and
5591 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
5592 * Negation of unsigned integers, which has been a warning for
5593 several releases, [is now behind a feature gate and will
5594 generate errors][1.5nu].
5595 * The parser accidentally accepted visibility modifiers on
5596 enum variants, a bug [which has been fixed][1.5ev].
5597 * [A bug was fixed that allowed `use` statements to import unstable
5603 * When evaluating expressions at compile-time that are not
5604 compile-time constants (const-evaluating expressions in non-const
5605 contexts), incorrect code such as overlong bitshifts and arithmetic
5606 overflow will [generate a warning instead of an error][1.5ce],
5607 delaying the error until runtime. This will allow the
5608 const-evaluator to be expanded in the future backwards-compatibly.
5609 * The `improper_ctypes` lint [no longer warns about using `isize` and
5610 `usize` in FFI][1.5ict].
5615 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
5617 * `Default` is [implemented for mutable slices][1.5d].
5618 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
5619 * There are now `From` conversions [between floating point
5620 types][1.5f] where the conversions are lossless.
5621 * There are now `From` conversions [between integer types][1.5i] where
5622 the conversions are lossless.
5623 * [`fs::Metadata` implements `Clone`][1.5fs].
5624 * The `parse` method [accepts a leading "+" when parsing
5626 * [`AsMut` is implemented for `Vec`][1.5am].
5627 * The `clone_from` implementations for `String` and `BinaryHeap` [have
5628 been optimized][1.5cf] and no longer rely on the default impl.
5629 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
5630 `unsafe extern "C"` function types now [implement `Clone`,
5631 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
5632 `fmt::Debug` for up to 12 arguments][1.5fp].
5633 * [Dropping `Vec`s is much faster in unoptimized builds when the
5634 element types don't implement `Drop`][1.5dv].
5635 * A bug that caused in incorrect behavior when [combining `VecDeque`
5636 with zero-sized types][1.5vdz] was resolved.
5637 * [`PartialOrd` for slices is faster][1.5po].
5642 * [Crate metadata size was reduced by 20%][1.5md].
5643 * [Improvements to code generation reduced the size of libcore by 3.3
5644 MB and rustc's memory usage by 18MB][1.5m].
5645 * [Improvements to deref translation increased performance in
5646 unoptimized builds][1.5dr].
5647 * Various errors in trait resolution [are deduplicated to only be
5648 reported once][1.5te].
5649 * Rust has preliminary [support for rumprun kernels][1.5rr].
5650 * Rust has preliminary [support for NetBSD on amd64][1.5na].
5652 [1.5use]: https://github.com/rust-lang/rust/pull/28364
5653 [1.5po]: https://github.com/rust-lang/rust/pull/28436
5654 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
5655 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
5656 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
5657 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
5658 [1.5md]: https://github.com/rust-lang/rust/pull/28521
5659 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
5660 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
5661 [1.5na]: https://github.com/rust-lang/rust/pull/28543
5662 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
5663 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
5664 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
5665 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
5666 [1.5te]: https://github.com/rust-lang/rust/pull/28645
5667 [1.5at]: https://github.com/rust-lang/rust/pull/28650
5668 [1.5am]: https://github.com/rust-lang/rust/pull/28663
5669 [1.5m]: https://github.com/rust-lang/rust/pull/28778
5670 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
5671 [1.5a]: https://github.com/rust-lang/rust/pull/28811
5672 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
5673 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
5674 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
5675 [1.5i]: https://github.com/rust-lang/rust/pull/28921
5676 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
5677 [1.5f]: https://github.com/rust-lang/rust/pull/29129
5678 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
5679 [1.5s]: https://github.com/rust-lang/rust/pull/29190
5680 [1.5d]: https://github.com/rust-lang/rust/pull/29245
5681 [1.5o]: https://github.com/rust-lang/rust/pull/29259
5682 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
5683 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5684 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
5685 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
5686 [1.5c]: https://github.com/rust-lang/rust/pull/29110
5687 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5688 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
5689 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
5690 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
5691 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
5692 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
5693 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
5694 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
5695 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
5696 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
5697 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
5698 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
5699 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
5700 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
5701 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
5702 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
5703 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
5704 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
5705 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
5706 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
5707 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
5708 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
5709 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
5710 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
5711 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
5712 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
5713 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
5714 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
5715 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
5716 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
5717 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
5718 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
5719 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
5720 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
5721 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
5722 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
5723 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
5724 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
5725 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
5726 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
5727 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
5728 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
5729 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
5730 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
5731 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
5732 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
5733 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
5734 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
5735 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
5736 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
5737 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
5738 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
5739 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
5740 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
5742 Version 1.4.0 (2015-10-29)
5743 ==========================
5745 * ~1200 changes, numerous bugfixes
5750 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
5751 GNU) are now supported and recommended for use.
5756 * [Several changes have been made to fix type soundness and improve
5757 the behavior of associated types][sound]. See [RFC 1214]. Although
5758 we have mostly introduced these changes as warnings this release, to
5759 become errors next release, there are still some scenarios that will
5760 see immediate breakage.
5761 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
5762 line breaks in addition to `\n`][crlf].
5763 * [Loans of `'static` lifetime extend to the end of a function][stat].
5764 * [`str::parse` no longer introduces avoidable rounding error when
5765 parsing floating point numbers. Together with earlier changes to
5766 float formatting/output, "round trips" like f.to_string().parse()
5767 now preserve the value of f exactly. Additionally, leading plus
5768 signs are now accepted][fp3].
5774 * `use` statements that import multiple items [can now rename
5775 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
5776 * [Binops work correctly on fat pointers][binfat].
5777 * `pub extern crate`, which does not behave as expected, [issues a
5778 warning][pec] until a better solution is found.
5783 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5784 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5785 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5786 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5787 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5788 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5789 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5790 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5791 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5792 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5793 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5794 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5795 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5796 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5797 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5798 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5799 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5800 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5802 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5803 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5804 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5805 `f64::from_str_radix`.
5806 * [Reverse-searching strings is faster with the 'two-way'
5808 * [`std::io::copy` allows `?Sized` arguments][cc].
5809 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5810 [override `count`, `nth` and `last` with an O(1)
5811 implementation][it].
5812 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5813 * [`IntoRawFd` has been added to the Unix-specific prelude,
5814 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5816 * [`Extend<String>` and `FromIterator<String` are both implemented for
5818 * [`IntoIterator` is implemented for references to `Option` and
5820 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5821 Copy`][ext] as part of [RFC 839]. This will cause type inference
5822 breakage in rare situations.
5823 * [`BinaryHeap` implements `Debug`][bh2].
5824 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5826 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5827 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5828 * [String comparison is faster][faststr].
5829 * `&mut T` where `T: std::fmt::Write` [also implements
5830 `std::fmt::Write`][mutw].
5831 * [A stable regression in `VecDeque::push_back` and other
5832 capacity-altering methods that caused panics for zero-sized types
5834 * [Function pointers implement traits for up to 12 parameters][fp2].
5839 * The compiler [no longer uses the 'morestack' feature to prevent
5840 stack overflow][mm]. Instead it uses guard pages and stack
5841 probes (though stack probes are not yet implemented on any platform
5843 * [The compiler matches traits faster when projections are involved][p].
5844 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5846 * [Cargo now displays useful information about what its doing during
5847 `cargo update`][cu].
5849 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5850 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5851 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5852 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5853 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5854 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5855 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5856 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5857 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5858 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5859 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5860 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5861 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5862 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5863 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5864 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5865 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5866 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5867 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5868 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5869 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5870 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5871 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5872 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5873 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5874 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5875 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
5876 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
5877 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
5878 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
5879 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
5880 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
5881 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
5882 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
5883 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
5884 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
5885 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
5886 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
5887 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
5888 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
5889 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
5890 [bh2]: https://github.com/rust-lang/rust/pull/28156
5891 [binfat]: https://github.com/rust-lang/rust/pull/28270
5892 [bm]: https://github.com/rust-lang/rust/pull/28197
5893 [cc]: https://github.com/rust-lang/rust/pull/27531
5894 [crlf]: https://github.com/rust-lang/rust/pull/28034
5895 [cu]: https://github.com/rust-lang/cargo/pull/1931
5896 [d]: https://github.com/rust-lang/rust/pull/27825
5897 [dep]: https://github.com/rust-lang/rust/pull/28339
5898 [es]: https://github.com/rust-lang/rust/pull/27956
5899 [ext]: https://github.com/rust-lang/rust/pull/28094
5900 [faststr]: https://github.com/rust-lang/rust/pull/28338
5901 [ffi]: https://github.com/rust-lang/rust/pull/28779
5902 [fp]: https://github.com/rust-lang/rust/pull/28268
5903 [fp2]: https://github.com/rust-lang/rust/pull/28560
5904 [fp3]: https://github.com/rust-lang/rust/pull/27307
5905 [i]: https://github.com/rust-lang/rust/pull/27451
5906 [into2]: https://github.com/rust-lang/rust/pull/28039
5907 [it]: https://github.com/rust-lang/rust/pull/27652
5908 [mm]: https://github.com/rust-lang/rust/pull/27338
5909 [mutw]: https://github.com/rust-lang/rust/pull/28368
5910 [sound]: https://github.com/rust-lang/rust/pull/27641
5911 [p]: https://github.com/rust-lang/rust/pull/27866
5912 [pec]: https://github.com/rust-lang/rust/pull/28486
5913 [pr]: https://github.com/rust-lang/rust/pull/27896
5914 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5915 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5916 [s]: https://github.com/rust-lang/rust/pull/27474
5917 [stab]: https://github.com/rust-lang/rust/pull/28339
5918 [stat]: https://github.com/rust-lang/rust/pull/28321
5919 [vd]: https://github.com/rust-lang/rust/pull/28494
5921 Version 1.3.0 (2015-09-17)
5922 ==============================
5924 * ~900 changes, numerous bugfixes
5929 * The [new object lifetime defaults][nold] have been [turned
5930 on][nold2] after a cycle of warnings about the change. Now types
5931 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
5932 being interpreted as `&'a Box<Trait+'a>` to `&'a
5933 Box<Trait+'static>`.
5934 * [The Rustonomicon][nom] is a new book in the official documentation
5935 that dives into writing unsafe Rust.
5936 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
5937 timekeeping is employed by other std APIs, as well as out-of-tree
5943 * The [new object lifetime defaults][nold] have been [turned
5944 on][nold2] after a cycle of warnings about the change.
5945 * There is a known [regression][lr] in how object lifetime elision is
5946 interpreted, the proper solution for which is undetermined.
5947 * The `#[prelude_import]` attribute, an internal implementation
5948 detail, was accidentally stabilized previously. [It has been put
5949 behind the `prelude_import` feature gate][pi]. This change is
5950 believed to break no existing code.
5951 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5952 [more sane for dynamically sized types][dst3]. Code that relied on
5953 the previous behavior is thought to be broken.
5954 * The `dropck` rules, which checks that destructors can't access
5955 destroyed values, [have been updated][dropck] to match the
5956 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
5957 cause some previously-compiling code to no longer build.
5962 * The [new object lifetime defaults][nold] have been [turned
5963 on][nold2] after a cycle of warnings about the change.
5964 * Semicolons may [now follow types and paths in
5965 macros](https://github.com/rust-lang/rust/pull/27000).
5966 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5967 [more sane for dynamically sized types][dst3]. Code that relied on
5968 the previous behavior is not known to exist, and suspected to be
5970 * `'static` variables [may now be recursive][st].
5971 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
5972 implementations correctly.
5973 * The `dropck` rules, which checks that destructors can't access
5974 destroyed values, [have been updated][dropck] to match the
5980 * The [`Duration`] API, [has been stabilized][ds], as well as the
5981 `std::time` module, which presently contains only `Duration`.
5982 * `Box<str>` and `Box<[T]>` both implement `Clone`.
5983 * The owned C string, [`CString`], implements [`Borrow`] and the
5984 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
5985 these allow C strings to be borrowed and cloned in generic code.
5986 * [`CStr`] implements [`Debug`].
5987 * [`AtomicPtr`] implements [`Debug`].
5988 * [`Error`] trait objects [can be downcast to their concrete types][e]
5989 in many common configurations, using the [`is`], [`downcast`],
5990 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
5992 * Searching for substrings now [employs the two-way algorithm][search]
5993 instead of doing a naive search. This gives major speedups to a
5994 number of methods, including [`contains`][sc], [`find`][sf],
5995 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
5996 [`ends_with`][sew] are also faster.
5997 * The performance of `PartialEq` for slices is [much faster][ps].
5998 * The [`Hash`] trait offers the default method, [`hash_slice`], which
5999 is overridden and optimized by the implementations for scalars.
6000 * The [`Hasher`] trait now has a number of specialized `write_*`
6001 methods for primitive types, for efficiency.
6002 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6003 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6004 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6005 of [`std::error::Error::cause`][iec] also delegates to the inner
6007 * [`process::Child`][pc] gained the [`id`] method, which returns a
6008 `u32` representing the platform-specific process identifier.
6009 * The [`connect`] method on slices is deprecated, replaced by the new
6010 [`join`] method (note that both of these are on the *unstable*
6011 [`SliceConcatExt`] trait, but through the magic of the prelude are
6012 available to stable code anyway).
6013 * The [`Div`] operator is implemented for [`Wrapping`] types.
6014 * [`DerefMut` is implemented for `String`][dms].
6015 * Performance of SipHash (the default hasher for `HashMap`) is
6016 [better for long data][sh].
6017 * [`AtomicPtr`] implements [`Send`].
6018 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
6019 are now [specialized to use uninitialized buffers for increased
6021 * Lifetime parameters of foreign functions [are now resolved
6027 * Rust can now, with some coercion, [produce programs that run on
6028 Windows XP][xp], though XP is not considered a supported platform.
6029 * Porting Rust on Windows from the GNU toolchain to MSVC continues
6030 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
6031 recommended for use in 1.3, though should be fully-functional
6032 in the [64-bit 1.4 beta][b14].
6033 * On Fedora-based systems installation will [properly configure the
6034 dynamic linker][fl].
6035 * The compiler gained many new extended error descriptions, which can
6036 be accessed with the `--explain` flag.
6037 * The `dropck` pass, which checks that destructors can't access
6038 destroyed values, [has been rewritten][dropck]. This fixes some
6039 soundness holes, and as such will cause some previously-compiling
6040 code to no longer build.
6041 * `rustc` now uses [LLVM to write archive files where possible][ar].
6042 Eventually this will eliminate the compiler's dependency on the ar
6044 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
6045 supported FreeBSD on x86_64).
6046 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
6047 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
6049 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
6050 will kill the process instead of leaking][nlp].
6052 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
6053 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
6054 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
6055 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
6056 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
6057 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6058 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6059 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
6060 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
6061 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
6062 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
6063 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
6064 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
6065 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6066 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
6067 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
6068 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
6069 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
6070 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6071 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
6072 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
6073 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
6074 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
6075 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6076 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
6077 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
6078 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
6079 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
6080 [ar]: https://github.com/rust-lang/rust/pull/26926
6081 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
6082 [dms]: https://github.com/rust-lang/rust/pull/26241
6083 [dropck]: https://github.com/rust-lang/rust/pull/27261
6084 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6085 [ds]: https://github.com/rust-lang/rust/pull/26818
6086 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
6087 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
6088 [dst3]: https://github.com/rust-lang/rust/pull/27351
6089 [e]: https://github.com/rust-lang/rust/pull/24793
6090 [f]: https://github.com/rust-lang/rust/pull/26588
6091 [fb]: https://github.com/rust-lang/rust/pull/26959
6092 [fl]: https://github.com/rust-lang/rust-installer/pull/41
6093 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6094 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
6095 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
6096 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
6097 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
6098 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
6099 [lic]: https://github.com/rust-lang/rust/pull/26583
6100 [lnu]: https://github.com/rust-lang/rust/pull/27026
6101 [lr]: https://github.com/rust-lang/rust/issues/27248
6102 [lum]: https://github.com/rust-lang/rust/pull/26378
6103 [lur]: https://github.com/rust-lang/rust/pull/26783
6104 [nlp]: https://github.com/rust-lang/rust/pull/27176
6105 [nold2]: https://github.com/rust-lang/rust/pull/27045
6106 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
6107 [nom]: http://doc.rust-lang.org/nightly/nomicon/
6108 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
6109 [pi]: https://github.com/rust-lang/rust/pull/26699
6110 [ps]: https://github.com/rust-lang/rust/pull/26884
6111 [rte]: https://github.com/rust-lang/rust/pull/26950
6112 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
6113 [search]: https://github.com/rust-lang/rust/pull/26327
6114 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
6115 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
6116 [sh]: https://github.com/rust-lang/rust/pull/27280
6117 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
6118 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
6119 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
6120 [st]: https://github.com/rust-lang/rust/pull/26630
6121 [win1]: https://github.com/rust-lang/rust/pull/26569
6122 [win2]: https://github.com/rust-lang/rust/pull/26741
6123 [win3]: https://github.com/rust-lang/rust/pull/26741
6124 [win4]: https://github.com/rust-lang/rust/pull/27210
6125 [xp]: https://github.com/rust-lang/rust/pull/26569
6127 Version 1.2.0 (2015-08-07)
6128 ==========================
6130 * ~1200 changes, numerous bugfixes
6135 * [Dynamically-sized-type coercions][dst] allow smart pointer types
6136 like `Rc` to contain types without a fixed size, arrays and trait
6137 objects, finally enabling use of `Rc<[T]>` and completing the
6138 implementation of DST.
6139 * [Parallel codegen][parcodegen] is now working again, which can
6140 substantially speed up large builds in debug mode; It also gets
6141 another ~33% speedup when bootstrapping on a 4 core machine (using 8
6142 jobs). It's not enabled by default, but will be "in the near
6143 future". It can be activated with the `-C codegen-units=N` flag to
6145 * This is the first release with [experimental support for linking
6146 with the MSVC linker and lib C on Windows (instead of using the GNU
6147 variants via MinGW)][win]. It is yet recommended only for the most
6148 intrepid Rustaceans.
6149 * Benchmark compilations are showing a 30% improvement in
6150 bootstrapping over 1.1.
6155 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
6156 unicode case mapping, which is a previously-planned change in
6157 behavior and considered a bugfix.
6158 * [`mem::align_of`] now specifies [the *minimum alignment* for
6159 T][align], which is usually the alignment programs are interested
6160 in, and the same value reported by clang's
6161 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
6163 * [The `#[packed]` attribute is no longer silently accepted by the
6164 compiler][packed]. This attribute did nothing and code that
6165 mentioned it likely did not work as intended.
6166 * Associated type defaults are [now behind the
6167 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
6168 defaults *did not work*, but could be mentioned syntactically. As
6169 such this breakage has minimal impact.
6174 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
6175 matching against dereferenceable values.
6180 * The [`Extend`] trait, which grows a collection from an iterator, is
6181 implemented over iterators of references, for `String`, `Vec`,
6182 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
6183 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
6184 * The [`iter::once`] function returns an iterator that yields a single
6185 element, and [`iter::empty`] returns an iterator that yields no
6187 * The [`matches`] and [`rmatches`] methods on `str` return iterators
6188 over substring matches.
6189 * [`Cell`] and [`RefCell`] both implement `Eq`.
6190 * A number of methods for wrapping arithmetic are added to the
6191 integral types, [`wrapping_div`], [`wrapping_rem`],
6192 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
6193 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
6194 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
6195 type.. It is illegal for the default arithmetic operations in Rust
6196 to overflow; the desire to wrap must be explicit.
6197 * The `{:#?}` formatting specifier [displays the alternate,
6198 pretty-printed][debugfmt] form of the `Debug` formatter. This
6199 feature was actually introduced prior to 1.0 with little
6201 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
6202 for writing data to formatted strings, similar to [`io::Write`].
6203 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
6204 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
6205 are used by code generators to emit implementations of [`Debug`].
6206 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
6207 methods that convert case, following Unicode case mapping.
6208 * It is now easier to handle poisoned locks. The [`PoisonError`]
6209 type, returned by failing lock operations, exposes `into_inner`,
6210 `get_ref`, and `get_mut`, which all give access to the inner lock
6211 guard, and allow the poisoned lock to continue to operate. The
6212 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
6213 poisoned lock without attempting to take the lock.
6214 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
6215 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
6216 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
6217 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
6219 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
6225 * `rustc` employs smarter heuristics for guessing at [typos].
6226 * `rustc` emits more efficient code for [no-op conversions between
6227 unsafe pointers][nop].
6228 * Fat pointers are now [passed in pairs of immediate arguments][fat],
6229 resulting in faster compile times and smaller code.
6231 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
6232 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6233 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
6234 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
6235 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
6236 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
6237 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
6238 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
6239 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
6240 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
6241 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
6242 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
6243 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
6244 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
6245 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
6246 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
6247 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6248 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
6249 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
6250 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
6251 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
6252 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
6253 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
6254 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
6255 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
6256 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6257 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
6258 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
6259 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
6260 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
6261 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
6262 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
6263 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
6264 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6265 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6266 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
6267 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
6268 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
6269 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
6270 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
6271 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
6272 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6273 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
6274 [align]: https://github.com/rust-lang/rust/pull/25646
6275 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
6276 [typos]: https://github.com/rust-lang/rust/pull/26087
6277 [nop]: https://github.com/rust-lang/rust/pull/26336
6278 [fat]: https://github.com/rust-lang/rust/pull/26411
6279 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
6280 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
6281 [packed]: https://github.com/rust-lang/rust/pull/25541
6282 [ad]: https://github.com/rust-lang/rust/pull/27382
6283 [win]: https://github.com/rust-lang/rust/pull/25350
6285 Version 1.1.0 (2015-06-25)
6286 =========================
6288 * ~850 changes, numerous bugfixes
6293 * The [`std::fs` module has been expanded][fs] to expand the set of
6294 functionality exposed:
6295 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
6296 don't incur a syscall on some platforms.
6297 * A `symlink_metadata` function has been added.
6298 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
6299 access to all underlying information.
6300 * The compiler now contains extended explanations of many errors. When an error
6301 with an explanation occurs the compiler suggests using the `--explain` flag
6302 to read the explanation. Error explanations are also [available online][err-index].
6303 * Thanks to multiple [improvements][sk] to [type checking][pre], as
6304 well as other work, the time to bootstrap the compiler decreased by
6310 * The [`str::split_whitespace`] method splits a string on unicode
6311 whitespace boundaries.
6312 * On both Windows and Unix, new extension traits provide conversion of
6313 I/O types to and from the underlying system handles. On Unix, these
6314 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
6315 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
6316 `TcpListener`, and `UpdSocket`. Further implementations for
6317 `std::process` will be stabilized later.
6318 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
6319 Windows, symlinks can be created with
6320 `std::os::windows::symlink_dir` and
6321 `std::os::windows::symlink_file`.
6322 * The `mpsc::Receiver` type can now be converted into an iterator with
6323 `into_iter` on the [`IntoIterator`] trait.
6324 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
6325 implementation of the [`From`] trait.
6326 * The `Debug` implementation for `RangeFull` [creates output that is
6327 more consistent with other implementations][rf].
6328 * [`Debug` is implemented for `File`][file].
6329 * The `Default` implementation for `Arc` [no longer requires `Sync +
6331 * [The `Iterator` methods `count`, `nth`, and `last` have been
6332 overridden for slices to have O(1) performance instead of O(n)][si].
6333 * Incorrect handling of paths on Windows has been improved in both the
6334 compiler and the standard library.
6335 * [`AtomicPtr` gained a `Default` implementation][ap].
6336 * In accordance with Rust's policy on arithmetic overflow `abs` now
6337 [panics on overflow when debug assertions are enabled][abs].
6338 * The [`Cloned`] iterator, which was accidentally left unstable for
6339 1.0 [has been stabilized][c].
6340 * The [`Incoming`] iterator, which iterates over incoming TCP
6341 connections, and which was accidentally unnamable in 1.0, [is now
6342 properly exported][inc].
6343 * [`BinaryHeap`] no longer corrupts itself [when functions called by
6344 `sift_up` or `sift_down` panic][bh].
6345 * The [`split_off`] method of `LinkedList` [no longer corrupts
6346 the list in certain scenarios][ll].
6351 * Type checking performance [has improved notably][sk] with
6352 [multiple improvements][pre].
6353 * The compiler [suggests code changes][ch] for more errors.
6354 * rustc and it's build system have experimental support for [building
6355 toolchains against MUSL][m] instead of glibc on Linux.
6356 * The compiler defines the `target_env` cfg value, which is used for
6357 distinguishing toolchains that are otherwise for the same
6358 platform. Presently this is set to `gnu` for common GNU Linux
6359 targets and for MinGW targets, and `musl` for MUSL Linux targets.
6360 * The [`cargo rustc`][crc] command invokes a build with custom flags
6362 * [Android executables are always position independent][pie].
6363 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
6366 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
6367 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6368 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6369 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
6370 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
6371 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
6372 [rf]: https://github.com/rust-lang/rust/pull/24491
6373 [err-index]: https://doc.rust-lang.org/error-index.html
6374 [sk]: https://github.com/rust-lang/rust/pull/24615
6375 [pre]: https://github.com/rust-lang/rust/pull/25323
6376 [file]: https://github.com/rust-lang/rust/pull/24598
6377 [ch]: https://github.com/rust-lang/rust/pull/24683
6378 [arc]: https://github.com/rust-lang/rust/pull/24695
6379 [si]: https://github.com/rust-lang/rust/pull/24701
6380 [ap]: https://github.com/rust-lang/rust/pull/24834
6381 [m]: https://github.com/rust-lang/rust/pull/24777
6382 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
6383 [crc]: https://github.com/rust-lang/cargo/pull/1568
6384 [pie]: https://github.com/rust-lang/rust/pull/24953
6385 [abs]: https://github.com/rust-lang/rust/pull/25441
6386 [c]: https://github.com/rust-lang/rust/pull/25496
6387 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
6388 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
6389 [inc]: https://github.com/rust-lang/rust/pull/25522
6390 [bh]: https://github.com/rust-lang/rust/pull/25856
6391 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
6392 [ll]: https://github.com/rust-lang/rust/pull/26022
6393 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
6394 [drop]: https://github.com/rust-lang/rust/pull/24935
6396 Version 1.0.0 (2015-05-15)
6397 ========================
6399 * ~1500 changes, numerous bugfixes
6404 * The vast majority of the standard library is now `#[stable]`. It is
6405 no longer possible to use unstable features with a stable build of
6407 * Many popular crates on [crates.io] now work on the stable release
6409 * Arithmetic on basic integer types now [checks for overflow in debug
6415 * Several [restrictions have been added to trait coherence][coh] in
6416 order to make it easier for upstream authors to change traits
6417 without breaking downstream code.
6418 * Digits of binary and octal literals are [lexed more eagerly][lex] to
6419 improve error messages and macro behavior. For example, `0b1234` is
6420 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
6421 * Trait bounds [are always invariant][inv], eliminating the need for
6422 the `PhantomFn` and `MarkerTrait` lang items, which have been
6424 * ["-" is no longer a valid character in crate names][cr], the `extern crate
6425 "foo" as bar` syntax has been replaced with `extern crate foo as
6426 bar`, and Cargo now automatically translates "-" in *package* names
6427 to underscore for the crate name.
6428 * [Lifetime shadowing is an error][lt].
6429 * [`Send` no longer implies `'static`][send-rfc].
6430 * [UFCS now supports trait-less associated paths][moar-ufcs] like
6431 `MyType::default()`.
6432 * Primitive types [now have inherent methods][prim-inherent],
6433 obviating the need for extension traits like `SliceExt`.
6434 * Methods with `Self: Sized` in their `where` clause are [considered
6435 object-safe][self-sized], allowing many extension traits like
6436 `IteratorExt` to be merged into the traits they extended.
6437 * You can now [refer to associated types][assoc-where] whose
6438 corresponding trait bounds appear only in a `where` clause.
6439 * The final bits of [OIBIT landed][oibit-final], meaning that traits
6440 like `Send` and `Sync` are now library-defined.
6441 * A [Reflect trait][reflect] was introduced, which means that
6442 downcasting via the `Any` trait is effectively limited to concrete
6443 types. This helps retain the potentially-important "parametricity"
6444 property: generic code cannot behave differently for different type
6445 arguments except in minor ways.
6446 * The `unsafe_destructor` feature is now deprecated in favor of the
6447 [new `dropck`][dropck]. This change is a major reduction in unsafe
6453 * The `thread_local` module [has been renamed to `std::thread`][th].
6454 * The methods of `IteratorExt` [have been moved to the `Iterator`
6456 * Several traits that implement Rust's conventions for type
6457 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
6458 [centralized in the `std::convert` module][con].
6459 * The `FromError` trait [was removed in favor of `From`][fe].
6460 * The basic sleep function [has moved to
6461 `std::thread::sleep_ms`][slp].
6462 * The `splitn` function now takes an `n` parameter that represents the
6463 number of items yielded by the returned iterator [instead of the
6464 number of 'splits'][spl].
6465 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
6466 * [Derived implementations of `PartialOrd` now order enums according
6467 to their explicitly-assigned discriminants][po].
6468 * [Methods for searching strings are generic over `Pattern`s][pat],
6469 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
6471 * [In method resolution, object methods are resolved before inherent
6473 * [`String::from_str` has been deprecated in favor of the `From` impl,
6474 `String::from`][sf].
6475 * [`io::Error` implements `Sync`][ios].
6476 * [The `words` method on `&str` has been replaced with
6477 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
6479 * The new path and IO modules are complete and `#[stable]`. This
6480 was the major library focus for this cycle.
6481 * The path API was [revised][path-normalize] to normalize `.`,
6482 adjusting the tradeoffs in favor of the most common usage.
6483 * A large number of remaining APIs in `std` were also stabilized
6484 during this cycle; about 75% of the non-deprecated API surface
6486 * The new [string pattern API][string-pattern] landed, which makes
6487 the string slice API much more internally consistent and flexible.
6488 * A new set of [generic conversion traits][conversion] replaced
6489 many existing ad hoc traits.
6490 * Generic numeric traits were [completely removed][num-traits]. This
6491 was made possible thanks to inherent methods for primitive types,
6492 and the removal gives maximal flexibility for designing a numeric
6493 hierarchy in the future.
6494 * The `Fn` traits are now related via [inheritance][fn-inherit]
6495 and provide ergonomic [blanket implementations][fn-blanket].
6496 * The `Index` and `IndexMut` traits were changed to
6497 [take the index by value][index-value], enabling code like
6498 `hash_map["string"]` to work.
6499 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
6500 `Copy` data is known to be `Clone` as well.
6505 * Many errors now have extended explanations that can be accessed with
6506 the `--explain` flag to `rustc`.
6507 * Many new examples have been added to the standard library
6509 * rustdoc has received a number of improvements focused on completion
6511 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
6512 * Much headway was made on ecosystem-wide CI, making it possible
6513 to [compare builds for breakage][ci-compare].
6516 [crates.io]: http://crates.io
6517 [clo]: https://github.com/rust-lang/rust/pull/24034
6518 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
6519 [con]: https://github.com/rust-lang/rust/pull/23875
6520 [cr]: https://github.com/rust-lang/rust/pull/23419
6521 [fe]: https://github.com/rust-lang/rust/pull/23879
6522 [ie]: https://github.com/rust-lang/rust/pull/23300
6523 [inv]: https://github.com/rust-lang/rust/pull/23938
6524 [ios]: https://github.com/rust-lang/rust/pull/24133
6525 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
6526 [lt]: https://github.com/rust-lang/rust/pull/24057
6527 [meth]: https://github.com/rust-lang/rust/pull/24056
6528 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
6529 [po]: https://github.com/rust-lang/rust/pull/24270
6530 [sf]: https://github.com/rust-lang/rust/pull/24517
6531 [slp]: https://github.com/rust-lang/rust/pull/23949
6532 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
6533 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
6534 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
6535 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
6536 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
6537 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
6538 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
6539 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
6540 [self-sized]: https://github.com/rust-lang/rust/pull/22301
6541 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
6542 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
6543 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
6544 [reflect]: https://github.com/rust-lang/rust/pull/23712
6545 [conversion]: https://github.com/rust-lang/rfcs/pull/529
6546 [num-traits]: https://github.com/rust-lang/rust/pull/23549
6547 [index-value]: https://github.com/rust-lang/rust/pull/23601
6548 [dropck]: https://github.com/rust-lang/rfcs/pull/769
6549 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
6550 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
6551 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
6552 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
6553 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
6556 Version 1.0.0-alpha.2 (2015-02-20)
6557 =====================================
6559 * ~1300 changes, numerous bugfixes
6563 * The various I/O modules were [overhauled][io-rfc] to reduce
6564 unnecessary abstractions and provide better interoperation with
6565 the underlying platform. The old `io` module remains temporarily
6567 * The standard library now [participates in feature gating][feat],
6568 so use of unstable libraries now requires a `#![feature(...)]`
6569 attribute. The impact of this change is [described on the
6570 forum][feat-forum]. [RFC][feat-rfc].
6574 * `for` loops [now operate on the `IntoIterator` trait][into],
6575 which eliminates the need to call `.iter()`, etc. to iterate
6576 over collections. There are some new subtleties to remember
6577 though regarding what sort of iterators various types yield, in
6578 particular that `for foo in bar { }` yields values from a move
6579 iterator, destroying the original collection. [RFC][into-rfc].
6580 * Objects now have [default lifetime bounds][obj], so you don't
6581 have to write `Box<Trait+'static>` when you don't care about
6582 storing references. [RFC][obj-rfc].
6583 * In types that implement `Drop`, [lifetimes must outlive the
6584 value][drop]. This will soon make it possible to safely
6585 implement `Drop` for types where `#[unsafe_destructor]` is now
6586 required. Read the [gorgeous RFC][drop-rfc] for details.
6587 * The fully qualified <T as Trait>::X syntax lets you set the Self
6588 type for a trait method or associated type. [RFC][ufcs-rfc].
6589 * References to types that implement `Deref<U>` now [automatically
6590 coerce to references][deref] to the dereferenced type `U`,
6591 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
6592 should eliminate many unsightly uses of `&*`, as when converting
6593 from references to vectors into references to
6594 slices. [RFC][deref-rfc].
6595 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
6596 `|:|`) is obsolete and closure kind is inferred from context.
6597 * [`Self` is a keyword][Self].
6601 * The `Show` and `String` formatting traits [have been
6602 renamed][fmt] to `Debug` and `Display` to more clearly reflect
6603 their related purposes. Automatically getting a string
6604 conversion to use with `format!("{:?}", something_to_debug)` is
6605 now written `#[derive(Debug)]`.
6606 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
6607 OsStr}`, provide strings in platform-specific encodings for easier
6608 interop with system APIs. [RFC][osstr-rfc].
6609 * The `boxed::into_raw` and `Box::from_raw` functions [convert
6610 between `Box<T>` and `*mut T`][boxraw], a common pattern for
6611 creating raw pointers.
6615 * Certain long error messages of the form 'expected foo found bar'
6616 are now [split neatly across multiple
6617 lines][multiline]. Examples in the PR.
6618 * On Unix Rust can be [uninstalled][un] by running
6619 `/usr/local/lib/rustlib/uninstall.sh`.
6620 * The `#[rustc_on_unimplemented]` attribute, requiring the
6621 'on_unimplemented' feature, lets rustc [display custom error
6622 messages when a trait is expected to be implemented for a type
6627 * Rust is tested against a [LALR grammar][lalr], which parses
6628 almost all the Rust files that rustc does.
6630 [boxraw]: https://github.com/rust-lang/rust/pull/21318
6631 [close]: https://github.com/rust-lang/rust/pull/21843
6632 [deref]: https://github.com/rust-lang/rust/pull/21351
6633 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
6634 [drop]: https://github.com/rust-lang/rust/pull/21972
6635 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6636 [feat]: https://github.com/rust-lang/rust/pull/21248
6637 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
6638 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
6639 [fmt]: https://github.com/rust-lang/rust/pull/21457
6640 [into]: https://github.com/rust-lang/rust/pull/20790
6641 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
6642 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6643 [lalr]: https://github.com/rust-lang/rust/pull/21452
6644 [multiline]: https://github.com/rust-lang/rust/pull/19870
6645 [obj]: https://github.com/rust-lang/rust/pull/22230
6646 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
6647 [onun]: https://github.com/rust-lang/rust/pull/20889
6648 [osstr]: https://github.com/rust-lang/rust/pull/21488
6649 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6650 [Self]: https://github.com/rust-lang/rust/pull/22158
6651 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
6652 [un]: https://github.com/rust-lang/rust/pull/22256
6655 Version 1.0.0-alpha (2015-01-09)
6656 ==================================
6658 * ~2400 changes, numerous bugfixes
6662 * The language itself is considered feature complete for 1.0,
6663 though there will be many usability improvements and bugfixes
6664 before the final release.
6665 * Nearly 50% of the public API surface of the standard library has
6666 been declared 'stable'. Those interfaces are unlikely to change
6668 * The long-running debate over integer types has been
6669 [settled][ints]: Rust will ship with types named `isize` and
6670 `usize`, rather than `int` and `uint`, for pointer-sized
6671 integers. Guidelines will be rolled out during the alpha cycle.
6672 * Most crates that are not `std` have been moved out of the Rust
6673 distribution into the Cargo ecosystem so they can evolve
6674 separately and don't need to be stabilized as quickly, including
6675 'time', 'getopts', 'num', 'regex', and 'term'.
6676 * Documentation continues to be expanded with more API coverage, more
6677 examples, and more in-depth explanations. The guides have been
6678 consolidated into [The Rust Programming Language][trpl].
6679 * "[Rust By Example][rbe]" is now maintained by the Rust team.
6680 * All official Rust binary installers now come with [Cargo], the
6681 Rust package manager.
6685 * Closures have been [completely redesigned][unboxed] to be
6686 implemented in terms of traits, can now be used as generic type
6687 bounds and thus monomorphized and inlined, or via an opaque
6688 pointer (boxed) as in the old system. The new system is often
6689 referred to as 'unboxed' closures.
6690 * Traits now support [associated types][assoc], allowing families
6691 of related types to be defined together and used generically in
6693 * Enum variants are [namespaced by their type names][enum].
6694 * [`where` clauses][where] provide a more versatile and attractive
6695 syntax for specifying generic bounds, though the previous syntax
6697 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
6699 * Rust [no longer has a runtime][rt] of any description, and only
6700 supports OS threads, not green threads.
6701 * At long last, Rust has been overhauled for 'dynamically-sized
6702 types' ([DST]), which integrates 'fat pointers' (object types,
6703 arrays, and `str`) more deeply into the type system, making it
6705 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
6706 `..j` that produce range types and which, when combined with the
6707 `Index` operator and multidispatch, leads to a convenient slice
6709 * The new range syntax revealed an ambiguity in the fixed-length
6710 array syntax, so now fixed length arrays [are written `[T;
6712 * The `Copy` trait is no longer implemented automatically. Unsafe
6713 pointers no longer implement `Sync` and `Send` so types
6714 containing them don't automatically either. `Sync` and `Send`
6715 are now 'unsafe traits' so one can "forcibly" implement them via
6716 `unsafe impl` if a type confirms to the requirements for them
6717 even though the internals do not (e.g. structs containing unsafe
6718 pointers like `Arc`). These changes are intended to prevent some
6719 footguns and are collectively known as [opt-in built-in
6720 traits][oibit] (though `Sync` and `Send` will soon become pure
6721 library types unknown to the compiler).
6722 * Operator traits now take their operands [by value][ops], and
6723 comparison traits can use multidispatch to compare one type
6724 against multiple other types, allowing e.g. `String` to be
6725 compared with `&str`.
6726 * `if let` and `while let` are no longer feature-gated.
6727 * Rust has adopted a more [uniform syntax for escaping unicode
6728 characters][unicode].
6729 * `macro_rules!` [has been declared stable][mac]. Though it is a
6730 flawed system it is sufficiently popular that it must be usable
6731 for 1.0. Effort has gone into [future-proofing][mac-future] it
6732 in ways that will allow other macro systems to be developed in
6733 parallel, and won't otherwise impact the evolution of the
6735 * The prelude has been [pared back significantly][prelude] such
6736 that it is the minimum necessary to support the most pervasive
6737 code patterns, and through [generalized where clauses][where]
6738 many of the prelude extension traits have been consolidated.
6739 * Rust's rudimentary reflection [has been removed][refl], as it
6740 incurred too much code generation for little benefit.
6741 * [Struct variants][structvars] are no longer feature-gated.
6742 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
6743 known as 'higher-ranked trait bounds', this crucially allows
6744 unboxed closures to work.
6745 * Macros invocations surrounded by parens or square brackets and
6746 not terminated by a semicolon are [parsed as
6747 expressions][macros], which makes expressions like `vec![1i32,
6748 2, 3].len()` work as expected.
6749 * Trait objects now implement their traits automatically, and
6750 traits that can be coerced to objects now must be [object
6752 * Automatically deriving traits is now done with `#[derive(...)]`
6753 not `#[deriving(...)]` for [consistency with other naming
6754 conventions][derive].
6755 * Importing the containing module or enum at the same time as
6756 items or variants they contain is [now done with `self` instead
6757 of `mod`][self], as in use `foo::{self, bar}`
6758 * Glob imports are no longer feature-gated.
6759 * The `box` operator and `box` patterns have been feature-gated
6760 pending a redesign. For now unique boxes should be allocated
6761 like other containers, with `Box::new`.
6765 * A [series][coll1] of [efforts][coll2] to establish
6766 [conventions][coll3] for collections types has resulted in API
6767 improvements throughout the standard library.
6768 * New [APIs for error handling][err] provide ergonomic interop
6769 between error types, and [new conventions][err-conv] describe
6770 more clearly the recommended error handling strategies in Rust.
6771 * The `fail!` macro has been renamed to [`panic!`][panic] so that
6772 it is easier to discuss failure in the context of error handling
6773 without making clarifications as to whether you are referring to
6774 the 'fail' macro or failure more generally.
6775 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
6776 syscall when available.
6777 * The 'serialize' crate has been renamed 'rustc-serialize' and
6778 moved out of the distribution to Cargo. Although it is widely
6779 used now, it is expected to be superseded in the near future.
6780 * The `Show` formatter, typically implemented with
6781 `#[derive(Show)]` is [now requested with the `{:?}`
6782 specifier][show] and is intended for use by all types, for uses
6783 such as `println!` debugging. The new `String` formatter must be
6784 implemented by hand, uses the `{}` specifier, and is intended
6785 for full-fidelity conversions of things that can logically be
6786 represented as strings.
6790 * [Flexible target specification][flex] allows rustc's code
6791 generation to be configured to support otherwise-unsupported
6793 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6794 respective debuggers with Rust-appropriate pretty-printing.
6795 * The Windows installation of Rust is distributed with the
6796 MinGW components currently required to link binaries on that
6801 * Nullable enum optimizations have been extended to more types so
6802 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6803 space than the inner types themselves.
6804 * Work has begun on supporting AArch64.
6806 [Cargo]: https://crates.io
6807 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6808 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6809 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6810 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6811 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6812 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6813 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6814 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6815 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6816 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6817 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6818 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6819 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6820 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6821 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6822 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6823 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6824 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6825 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6826 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6827 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6828 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6829 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6830 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6831 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6832 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6833 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6834 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6835 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6836 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6837 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6838 [trpl]: https://doc.rust-lang.org/book/index.html
6839 [rbe]: http://rustbyexample.com/
6842 Version 0.12.0 (2014-10-09)
6843 =============================
6845 * ~1900 changes, numerous bugfixes
6849 * The introductory documentation (now called The Rust Guide) has
6850 been completely rewritten, as have a number of supplementary
6852 * Rust's package manager, Cargo, continues to improve and is
6853 sometimes considered to be quite awesome.
6854 * Many API's in `std` have been reviewed and updated for
6855 consistency with the in-development Rust coding
6856 guidelines. The standard library documentation tracks
6857 stabilization progress.
6858 * Minor libraries have been moved out-of-tree to the rust-lang org
6859 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6860 be installed with Cargo.
6861 * Lifetime elision allows lifetime annotations to be left off of
6862 function declarations in many common scenarios.
6863 * Rust now works on 64-bit Windows.
6866 * Indexing can be overloaded with the `Index` and `IndexMut`
6868 * The `if let` construct takes a branch only if the `let` pattern
6869 matches, currently behind the 'if_let' feature gate.
6870 * 'where clauses', a more flexible syntax for specifying trait
6871 bounds that is more aesthetic, have been added for traits and
6872 free functions. Where clauses will in the future make it
6873 possible to constrain associated types, which would be
6874 impossible with the existing syntax.
6875 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
6876 the 'slicing_syntax' feature gate, and can be overloaded with
6877 the `Slice` or `SliceMut` traits.
6878 * The syntax for matching of sub-slices has been changed to use a
6879 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
6880 consistency with other uses of `..` and to future-proof
6881 potential additional uses of the syntax.
6882 * The syntax for matching inclusive ranges in patterns has changed
6883 from `0..3` to `0...4` to be consistent with the exclusive range
6885 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
6886 c]`) has been put behind the 'advanced_slice_patterns' feature
6887 gate and may be removed in the future.
6888 * Components of tuples and tuple structs can be extracted using
6889 the `value.0` syntax, currently behind the `tuple_indexing`
6891 * The `#[crate_id]` attribute is no longer supported; versioning
6892 is handled by the package manager.
6893 * Renaming crate imports are now written `extern crate foo as bar`
6894 instead of `extern crate bar = foo`.
6895 * Renaming use statements are now written `use foo as bar` instead
6897 * `let` and `match` bindings and argument names in macros are now
6899 * The new, more efficient, closure types ('unboxed closures') have
6900 been added under a feature gate, 'unboxed_closures'. These will
6901 soon replace the existing closure types, once higher-ranked
6902 trait lifetimes are added to the language.
6903 * `move` has been added as a keyword, for indicating closures
6904 that capture by value.
6905 * Mutation and assignment is no longer allowed in pattern guards.
6906 * Generic structs and enums can now have trait bounds.
6907 * The `Share` trait is now called `Sync` to free up the term
6908 'shared' to refer to 'shared reference' (the default reference
6910 * Dynamically-sized types have been mostly implemented,
6911 unifying the behavior of fat-pointer types with the rest of the
6913 * As part of dynamically-sized types, the `Sized` trait has been
6914 introduced, which qualifying types implement by default, and
6915 which type parameters expect by default. To specify that a type
6916 parameter does not need to be sized, write `<Sized? T>`. Most
6917 types are `Sized`, notable exceptions being unsized arrays
6918 (`[T]`) and trait types.
6919 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
6920 * Lifetime bounds can now be applied to type parameters and object
6922 * The old, reference counted GC type, `Gc<T>` which was once
6923 denoted by the `@` sigil, has finally been removed. GC will be
6924 revisited in the future.
6927 * Library documentation has been improved for a number of modules.
6928 * Bit-vectors, collections::bitv has been modernized.
6929 * The url crate is deprecated in favor of
6930 http://github.com/servo/rust-url, which can be installed with
6932 * Most I/O stream types can be cloned and subsequently closed from
6934 * A `std::time::Duration` type has been added for use in I/O
6935 methods that rely on timers, as well as in the 'time' crate's
6936 `Timespec` arithmetic.
6937 * The runtime I/O abstraction layer that enabled the green thread
6938 scheduler to do non-thread-blocking I/O has been removed, along
6939 with the libuv-based implementation employed by the green thread
6940 scheduler. This will greatly simplify the future I/O work.
6941 * `collections::btree` has been rewritten to have a more
6942 idiomatic and efficient design.
6945 * rustdoc output now indicates the stability levels of API's.
6946 * The `--crate-name` flag can specify the name of the crate
6947 being compiled, like `#[crate_name]`.
6948 * The `-C metadata` specifies additional metadata to hash into
6949 symbol names, and `-C extra-filename` specifies additional
6950 information to put into the output filename, for use by the
6951 package manager for versioning.
6952 * debug info generation has continued to improve and should be
6953 more reliable under both gdb and lldb.
6954 * rustc has experimental support for compiling in parallel
6955 using the `-C codegen-units` flag.
6956 * rustc no longer encodes rpath information into binaries by
6960 * Stack usage has been optimized with LLVM lifetime annotations.
6961 * Official Rust binaries on Linux are more compatible with older
6962 kernels and distributions, built on CentOS 5.10.
6965 Version 0.11.0 (2014-07-02)
6966 ==========================
6968 * ~1700 changes, numerous bugfixes
6971 * ~[T] has been removed from the language. This type is superseded by
6973 * ~str has been removed from the language. This type is superseded by
6975 * ~T has been removed from the language. This type is superseded by the
6977 * @T has been removed from the language. This type is superseded by the
6978 standard library's std::gc::Gc<T> type.
6979 * Struct fields are now all private by default.
6980 * Vector indices and shift amounts are both required to be a `uint`
6981 instead of any integral type.
6982 * Byte character, byte string, and raw byte string literals are now all
6983 supported by prefixing the normal literal with a `b`.
6984 * Multiple ABIs are no longer allowed in an ABI string
6985 * The syntax for lifetimes on closures/procedures has been tweaked
6986 slightly: `<'a>|A, B|: 'b + K -> T`
6987 * Floating point modulus has been removed from the language; however it
6988 is still provided by a library implementation.
6989 * Private enum variants are now disallowed.
6990 * The `priv` keyword has been removed from the language.
6991 * A closure can no longer be invoked through a &-pointer.
6992 * The `use foo, bar, baz;` syntax has been removed from the language.
6993 * The transmute intrinsic no longer works on type parameters.
6994 * Statics now allow blocks/items in their definition.
6995 * Trait bounds are separated from objects with + instead of : now.
6996 * Objects can no longer be read while they are mutably borrowed.
6997 * The address of a static is now marked as insignificant unless the
6998 #[inline(never)] attribute is placed it.
6999 * The #[unsafe_destructor] attribute is now behind a feature gate.
7000 * Struct literals are no longer allowed in ambiguous positions such as
7001 if, while, match, and for..in.
7002 * Declaration of lang items and intrinsics are now feature-gated by
7004 * Integral literals no longer default to `int`, and floating point
7005 literals no longer default to `f64`. Literals must be suffixed with an
7006 appropriate type if inference cannot determine the type of the
7008 * The Box<T> type is no longer implicitly borrowed to &mut T.
7009 * Procedures are now required to not capture borrowed references.
7012 * The standard library is now a "facade" over a number of underlying
7013 libraries. This means that development on the standard library should
7014 be speedier due to smaller crates, as well as a clearer line between
7016 * A new library, libcore, lives under the standard library's facade
7017 which is Rust's "0-assumption" library, suitable for embedded and
7018 kernel development for example.
7019 * A regex crate has been added to the standard distribution. This crate
7020 includes statically compiled regular expressions.
7021 * The unwrap/unwrap_err methods on Result require a Show bound for
7022 better error messages.
7023 * The return types of the std::comm primitives have been centralized
7024 around the Result type.
7025 * A number of I/O primitives have gained the ability to time out their
7027 * A number of I/O primitives have gained the ability to close their
7028 reading/writing halves to cancel pending operations.
7029 * Reverse iterator methods have been removed in favor of `rev()` on
7030 their forward-iteration counterparts.
7031 * A bitflags! macro has been added to enable easy interop with C and
7032 management of bit flags.
7033 * A debug_assert! macro is now provided which is disabled when
7034 `--cfg ndebug` is passed to the compiler.
7035 * A graphviz crate has been added for creating .dot files.
7036 * The std::cast module has been migrated into std::mem.
7037 * The std::local_data api has been migrated from freestanding functions
7038 to being based on methods.
7039 * The Pod trait has been renamed to Copy.
7040 * jemalloc has been added as the default allocator for types.
7041 * The API for allocating memory has been changed to use proper alignment
7042 and sized deallocation
7043 * Connecting a TcpStream or binding a TcpListener is now based on a
7044 string address and a u16 port. This allows connecting to a hostname as
7046 * The Reader trait now contains a core method, read_at_least(), which
7047 correctly handles many repeated 0-length reads.
7048 * The process-spawning API is now centered around a builder-style
7050 * The :? printing qualifier has been moved from the standard library to
7051 an external libdebug crate.
7052 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
7053 have been renamed to Eq/Ord.
7054 * The select/plural methods have been removed from format!. The escapes
7055 for { and } have also changed from \{ and \} to {{ and }},
7057 * The TaskBuilder API has been re-worked to be a true builder, and
7058 extension traits for spawning native/green tasks have been added.
7061 * All breaking changes to the language or libraries now have their
7062 commit message annotated with `[breaking-change]` to allow for easy
7063 discovery of breaking changes.
7064 * The compiler will now try to suggest how to annotate lifetimes if a
7065 lifetime-related error occurs.
7066 * Debug info continues to be improved greatly with general bug fixes and
7067 better support for situations like link time optimization (LTO).
7068 * Usage of syntax extensions when cross-compiling has been fixed.
7069 * Functionality equivalent to GCC & Clang's -ffunction-sections,
7070 -fdata-sections and --gc-sections has been enabled by default
7071 * The compiler is now stricter about where it will load module files
7072 from when a module is declared via `mod foo;`.
7073 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
7074 Syntax extensions are now discovered via a "plugin registrar" type
7075 which will be extended in the future to other various plugins.
7076 * Lints have been restructured to allow for dynamically loadable lints.
7077 * A number of rustdoc improvements:
7078 * The HTML output has been visually redesigned.
7079 * Markdown is now powered by hoedown instead of sundown.
7080 * Searching heuristics have been greatly improved.
7081 * The search index has been reduced in size by a great amount.
7082 * Cross-crate documentation via `pub use` has been greatly improved.
7083 * Primitive types are now hyperlinked and documented.
7084 * Documentation has been moved from static.rust-lang.org/doc to
7086 * A new sandbox, play.rust-lang.org, is available for running and
7087 sharing rust code examples on-line.
7088 * Unused attributes are now more robustly warned about.
7089 * The dead_code lint now warns about unused struct fields.
7090 * Cross-compiling to iOS is now supported.
7091 * Cross-compiling to mipsel is now supported.
7092 * Stability attributes are now inherited by default and no longer apply
7093 to intra-crate usage, only inter-crate usage.
7094 * Error message related to non-exhaustive match expressions have been
7098 Version 0.10 (2014-04-03)
7099 =========================
7101 * ~1500 changes, numerous bugfixes
7104 * A new RFC process is now in place for modifying the language.
7105 * Patterns with `@`-pointers have been removed from the language.
7106 * Patterns with unique vectors (`~[T]`) have been removed from the
7108 * Patterns with unique strings (`~str`) have been removed from the
7110 * `@str` has been removed from the language.
7111 * `@[T]` has been removed from the language.
7112 * `@self` has been removed from the language.
7113 * `@Trait` has been removed from the language.
7114 * Headers on `~` allocations which contain `@` boxes inside the type for
7115 reference counting have been removed.
7116 * The semantics around the lifetimes of temporary expressions have changed,
7117 see #3511 and #11585 for more information.
7118 * Cross-crate syntax extensions are now possible, but feature gated. See
7119 #11151 for more information. This includes both `macro_rules!` macros as
7120 well as syntax extensions such as `format!`.
7121 * New lint modes have been added, and older ones have been turned on to be
7123 * Unnecessary parentheses
7126 * Uppercase variables
7127 * Publicly visible private types
7128 * `#[deriving]` with raw pointers
7129 * Unsafe functions can no longer be coerced to closures.
7130 * Various obscure macros such as `log_syntax!` are now behind feature gates.
7131 * The `#[simd]` attribute is now behind a feature gate.
7132 * Visibility is no longer allowed on `extern crate` statements, and
7133 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
7134 * Trailing commas are now allowed in argument lists and tuple patterns.
7135 * The `do` keyword has been removed, it is now a reserved keyword.
7136 * Default type parameters have been implemented, but are feature gated.
7137 * Borrowed variables through captures in closures are now considered soundly.
7138 * `extern mod` is now `extern crate`
7139 * The `Freeze` trait has been removed.
7140 * The `Share` trait has been added for types that can be shared among
7142 * Labels in macros are now hygienic.
7143 * Expression/statement macro invocations can be delimited with `{}` now.
7144 * Treatment of types allowed in `static mut` locations has been tweaked.
7145 * The `*` and `.` operators are now overloadable through the `Deref` and
7147 * `~Trait` and `proc` no longer have `Send` bounds by default.
7148 * Partial type hints are now supported with the `_` type marker.
7149 * An `Unsafe` type was introduced for interior mutability. It is now
7150 considered undefined to transmute from `&T` to `&mut T` without using the
7152 * The #[linkage] attribute was implemented for extern statics/functions.
7153 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
7154 * `Pod` was renamed to `Copy`.
7157 * The `libextra` library has been removed. It has now been decomposed into
7158 component libraries with smaller and more focused nuggets of
7159 functionality. The full list of libraries can be found on the
7160 documentation index page.
7161 * std: `std::condition` has been removed. All I/O errors are now propagated
7162 through the `Result` type. In order to assist with error handling, a
7163 `try!` macro for unwrapping errors with an early return and a lint for
7164 unused results has been added. See #12039 for more information.
7165 * std: The `vec` module has been renamed to `slice`.
7166 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
7167 This will become the only growable vector in the future.
7168 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
7169 are now found at `std::io::BufferedReader` instead of
7170 `std::io::buffered::BufferedReader`.
7171 * std: `print` and `println` are no longer in the prelude, the `print!` and
7172 `println!` macros are intended to be used instead.
7173 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
7174 attempts to statically prevent cycles.
7175 * std: The standard distribution is adopting the policy of pushing failure
7176 to the user rather than failing in libraries. Many functions (such as
7177 `slice::last()`) now return `Option<T>` instead of `T` + failing.
7178 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
7179 deriving mode: `#[deriving(Show)]`.
7180 * std: `ToStr` is now implemented for all types implementing `Show`.
7181 * std: The formatting trait methods now take `&self` instead of `&T`
7182 * std: The `invert()` method on iterators has been renamed to `rev()`
7183 * std: `std::num` has seen a reduction in the genericity of its traits,
7184 consolidating functionality into a few core traits.
7185 * std: Backtraces are now printed on task failure if the environment
7186 variable `RUST_BACKTRACE` is present.
7187 * std: Naming conventions for iterators have been standardized. More details
7188 can be found on the wiki's style guide.
7189 * std: `eof()` has been removed from the `Reader` trait. Specific types may
7190 still implement the function.
7191 * std: Networking types are now cloneable to allow simultaneous reads/writes.
7192 * std: `assert_approx_eq!` has been removed
7193 * std: The `e` and `E` formatting specifiers for floats have been added to
7194 print them in exponential notation.
7195 * std: The `Times` trait has been removed
7196 * std: Indications of variance and opting out of builtin bounds is done
7197 through marker types in `std::kinds::marker` now
7198 * std: `hash` has been rewritten, `IterBytes` has been removed, and
7199 `#[deriving(Hash)]` is now possible.
7200 * std: `SharedChan` has been removed, `Sender` is now cloneable.
7201 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
7202 * std: `Chan::new` is now `channel()`.
7203 * std: A new synchronous channel type has been implemented.
7204 * std: A `select!` macro is now provided for selecting over `Receiver`s.
7205 * std: `hashmap` and `trie` have been moved to `libcollections`
7206 * std: `run` has been rolled into `io::process`
7207 * std: `assert_eq!` now uses `{}` instead of `{:?}`
7208 * std: The equality and comparison traits have seen some reorganization.
7209 * std: `rand` has moved to `librand`.
7210 * std: `to_{lower,upper}case` has been implemented for `char`.
7211 * std: Logging has been moved to `liblog`.
7212 * collections: `HashMap` has been rewritten for higher performance and less
7214 * native: The default runtime is now `libnative`. If `libgreen` is desired,
7215 it can be booted manually. The runtime guide has more information and
7217 * native: All I/O functionality except signals has been implemented.
7218 * green: Task spawning with `libgreen` has been optimized with stack caching
7219 and various trimming of code.
7220 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
7221 * sync: The `extra::sync` module has been updated to modern rust (and moved
7222 to the `sync` library), tweaking and improving various interfaces while
7223 dropping redundant functionality.
7224 * sync: A new `Barrier` type has been added to the `sync` library.
7225 * sync: An efficient mutex for native and green tasks has been implemented.
7226 * serialize: The `base64` module has seen some improvement. It treats
7227 newlines better, has non-string error values, and has seen general
7229 * fourcc: A `fourcc!` macro was introduced
7230 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
7231 hexadecimal literal.
7234 * `rustpkg` has been deprecated and removed from the main repository. Its
7235 replacement, `cargo`, is under development.
7236 * Nightly builds of rust are now available
7237 * The memory usage of rustc has been improved many times throughout this
7239 * The build process supports disabling rpath support for the rustc binary
7241 * Code generation has improved in some cases, giving more information to the
7242 LLVM optimization passes to enable more extensive optimizations.
7243 * Debuginfo compatibility with lldb on OSX has been restored.
7244 * The master branch is now gated on an android bot, making building for
7245 android much more reliable.
7246 * Output flags have been centralized into one `--emit` flag.
7247 * Crate type flags have been centralized into one `--crate-type` flag.
7248 * Codegen flags have been consolidated behind a `-C` flag.
7249 * Linking against outdated crates now has improved error messages.
7250 * Error messages with lifetimes will often suggest how to annotate the
7251 function to fix the error.
7252 * Many more types are documented in the standard library, and new guides
7254 * Many `rustdoc` improvements:
7255 * code blocks are syntax highlighted.
7256 * render standalone markdown files.
7257 * the --test flag tests all code blocks by default.
7258 * exported macros are displayed.
7259 * re-exported types have their documentation inlined at the location of the
7261 * search works across crates that have been rendered to the same output
7265 Version 0.9 (2014-01-09)
7266 ==========================
7268 * ~1800 changes, numerous bugfixes
7271 * The `float` type has been removed. Use `f32` or `f64` instead.
7272 * A new facility for enabling experimental features (feature gating) has
7273 been added, using the crate-level `#[feature(foo)]` attribute.
7274 * Managed boxes (@) are now behind a feature gate
7275 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
7276 standard library's `Gc` or `Rc` types instead.
7277 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
7278 * Jumping back to the top of a loop is now done with `continue` instead of
7280 * Strings can no longer be mutated through index assignment.
7281 * Raw strings can be created via the basic `r"foo"` syntax or with matched
7282 hash delimiters, as in `r###"foo"###`.
7283 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
7285 * The `&fn` type is now written `|args| -> ret` to match the literal form.
7286 * `@fn`s have been removed.
7287 * `do` only works with procs in order to make it obvious what the cost
7289 * Single-element tuple-like structs can no longer be dereferenced to
7290 obtain the inner value. A more comprehensive solution for overloading
7291 the dereference operator will be provided in the future.
7292 * The `#[link(...)]` attribute has been replaced with
7293 `#[crate_id = "name#vers"]`.
7294 * Empty `impl`s must be terminated with empty braces and may not be
7295 terminated with a semicolon.
7296 * Keywords are no longer allowed as lifetime names; the `self` lifetime
7297 no longer has any special meaning.
7298 * The old `fmt!` string formatting macro has been removed.
7299 * `printf!` and `printfln!` (old-style formatting) removed in favor of
7300 `print!` and `println!`.
7301 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
7302 * The `extern mod foo (name = "bar")` syntax has been removed. Use
7303 `extern mod foo = "bar"` instead.
7304 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
7305 * Macros can have attributes.
7306 * Macros can expand to items with attributes.
7307 * Macros can expand to multiple items.
7308 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
7309 * Comments may be nested.
7310 * Values automatically coerce to trait objects they implement, without
7312 * Enum discriminants are no longer an entire word but as small as needed to
7313 contain all the variants. The `repr` attribute can be used to override
7314 the discriminant size, as in `#[repr(int)]` for integer-sized, and
7315 `#[repr(C)]` to match C enums.
7316 * Non-string literals are not allowed in attributes (they never worked).
7317 * The FFI now supports variadic functions.
7318 * Octal numeric literals, as in `0o7777`.
7319 * The `concat!` syntax extension performs compile-time string concatenation.
7320 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
7321 removed as Rust no longer uses segmented stacks.
7322 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
7323 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
7324 not `*`; ignoring remaining fields of a struct is also done with `..`,
7325 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
7326 * `rustc` supports the "win64" calling convention via `extern "win64"`.
7327 * `rustc` supports the "system" calling convention, which defaults to the
7328 preferred convention for the target platform, "stdcall" on 32-bit Windows,
7330 * The `type_overflow` lint (default: warn) checks literals for overflow.
7331 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
7332 * The `attribute_usage` lint (default: warn) warns about unknown
7334 * The `unknown_features` lint (default: warn) warns about unknown
7336 * The `dead_code` lint (default: warn) checks for dead code.
7337 * Rust libraries can be linked statically to one another
7338 * `#[link_args]` is behind the `link_args` feature gate.
7339 * Native libraries are now linked with `#[link(name = "foo")]`
7340 * Native libraries can be statically linked to a rust crate
7341 (`#[link(name = "foo", kind = "static")]`).
7342 * Native OS X frameworks are now officially supported
7343 (`#[link(name = "foo", kind = "framework")]`).
7344 * The `#[thread_local]` attribute creates thread-local (not task-local)
7345 variables. Currently behind the `thread_local` feature gate.
7346 * The `return` keyword may be used in closures.
7347 * Types that can be copied via a memcpy implement the `Pod` kind.
7348 * The `cfg` attribute can now be used on struct fields and enum variants.
7351 * std: The `option` and `result` API's have been overhauled to make them
7352 simpler, more consistent, and more composable.
7353 * std: The entire `std::io` module has been replaced with one that is
7354 more comprehensive and that properly interfaces with the underlying
7355 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
7357 * std: `io::util` contains a number of useful implementations of
7358 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
7359 `ZeroReader`, `TeeReader`.
7360 * std: The reference counted pointer type `extra::rc` moved into std.
7361 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
7362 just a wrapper around it).
7363 * std: The `Either` type has been removed.
7364 * std: `fmt::Default` can be implemented for any type to provide default
7365 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
7366 * std: The `rand` API continues to be tweaked.
7367 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
7368 on failure in gdb, is now named `rust_fail`.
7369 * std: The `each_key` and `each_value` methods on `HashMap` have been
7370 replaced by the `keys` and `values` iterators.
7371 * std: Functions dealing with type size and alignment have moved from the
7372 `sys` module to the `mem` module.
7373 * std: The `path` module was written and API changed.
7374 * std: `str::from_utf8` has been changed to cast instead of allocate.
7375 * std: `starts_with` and `ends_with` methods added to vectors via the
7376 `ImmutableEqVector` trait, which is in the prelude.
7377 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
7378 if the index is out of bounds.
7379 * std: Task failure no longer propagates between tasks, as the model was
7380 complex, expensive, and incompatible with thread-based tasks.
7381 * std: The `Any` type can be used for dynamic typing.
7382 * std: `~Any` can be passed to the `fail!` macro and retrieved via
7384 * std: Methods that produce iterators generally do not have an `_iter`
7386 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
7387 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
7388 * std: `util::ignore` renamed to `prelude::drop`.
7389 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
7391 * std: `vec::raw` has seen a lot of cleanup and API changes.
7392 * std: The standard library no longer includes any C++ code, and very
7393 minimal C, eliminating the dependency on libstdc++.
7394 * std: Runtime scheduling and I/O functionality has been factored out into
7395 extensible interfaces and is now implemented by two different crates:
7396 libnative, for native threading and I/O; and libgreen, for green threading
7397 and I/O. This paves the way for using the standard library in more limited
7398 embedded environments.
7399 * std: The `comm` module has been rewritten to be much faster, have a
7400 simpler, more consistent API, and to work for both native and green
7402 * std: All libuv dependencies have been moved into the rustuv crate.
7403 * native: New implementations of runtime scheduling on top of OS threads.
7404 * native: New native implementations of TCP, UDP, file I/O, process spawning,
7406 * green: The green thread scheduler and message passing types are almost
7408 * extra: The `flatpipes` module had bitrotted and was removed.
7409 * extra: All crypto functions have been removed and Rust now has a policy of
7410 not reimplementing crypto in the standard library. In the future crypto
7411 will be provided by external crates with bindings to established libraries.
7412 * extra: `c_vec` has been modernized.
7413 * extra: The `sort` module has been removed. Use the `sort` method on
7417 * The `rust` and `rusti` commands have been removed, due to lack of
7419 * `rustdoc` was completely rewritten.
7420 * `rustdoc` can test code examples in documentation.
7421 * `rustpkg` can test packages with the argument, 'test'.
7422 * `rustpkg` supports arbitrary dependencies, including C libraries.
7423 * `rustc`'s support for generating debug info is improved again.
7424 * `rustc` has better error reporting for unbalanced delimiters.
7425 * `rustc`'s JIT support was removed due to bitrot.
7426 * Executables and static libraries can be built with LTO (-Z lto)
7427 * `rustc` adds a `--dep-info` flag for communicating dependencies to
7431 Version 0.8 (2013-09-26)
7432 ============================
7434 * ~2200 changes, numerous bugfixes
7437 * The `for` loop syntax has changed to work with the `Iterator` trait.
7438 * At long last, unwinding works on Windows.
7439 * Default methods are ready for use.
7440 * Many trait inheritance bugs fixed.
7441 * Owned and borrowed trait objects work more reliably.
7442 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
7443 * rustc can omit emission of code for the `debug!` macro if it is passed
7445 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
7446 for foo.rs, then foo/mod.rs, and will generate an error when both are
7448 * Strings no longer contain trailing nulls. The new `std::c_str` module
7449 provides new mechanisms for converting to C strings.
7450 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
7451 * The FFI has been overhauled such that foreign functions are called directly,
7452 instead of through a stack-switching wrapper.
7453 * Calling a foreign function must be done through a Rust function with the
7454 `#[fixed_stack_segment]` attribute.
7455 * The `externfn!` macro can be used to declare both a foreign function and
7456 a `#[fixed_stack_segment]` wrapper at once.
7457 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
7458 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
7459 * `priv` is disallowed everywhere except for struct fields and enum variants.
7460 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
7461 * `ref` bindings in irrefutable patterns work correctly now.
7462 * `char` is now prevented from containing invalid code points.
7463 * Casting to `bool` is no longer allowed.
7464 * `\0` is now accepted as an escape in chars and strings.
7465 * `yield` is a reserved keyword.
7466 * `typeof` is a reserved keyword.
7467 * Crates may be imported by URL with `extern mod foo = "url";`.
7468 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
7469 * Static vectors can be initialized with repeating elements,
7470 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
7471 * Static structs can be initialized with functional record update,
7472 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
7473 * `cfg!` can be used to conditionally execute code based on the crate
7474 configuration, similarly to `#[cfg(...)]`.
7475 * The `unnecessary_qualification` lint detects unneeded module
7476 prefixes (default: allow).
7477 * Arithmetic operations have been implemented on the SIMD types in
7478 `std::unstable::simd`.
7479 * Exchange allocation headers were removed, reducing memory usage.
7480 * `format!` implements a completely new, extensible, and higher-performance
7481 string formatting system. It will replace `fmt!`.
7482 * `print!` and `println!` write formatted strings (using the `format!`
7483 extension) to stdout.
7484 * `write!` and `writeln!` write formatted strings (using the `format!`
7485 extension) to the new Writers in `std::rt::io`.
7486 * The library section in which a function or static is placed may
7487 be specified with `#[link_section = "..."]`.
7488 * The `proto!` syntax extension for defining bounded message protocols
7490 * `macro_rules!` is hygienic for `let` declarations.
7491 * The `#[export_name]` attribute specifies the name of a symbol.
7492 * `unreachable!` can be used to indicate unreachable code, and fails
7496 * std: Transitioned to the new runtime, written in Rust.
7497 * std: Added an experimental I/O library, `rt::io`, based on the new
7499 * std: A new generic `range` function was added to the prelude, replacing
7500 `uint::range` and friends.
7501 * std: `range_rev` no longer exists. Since range is an iterator it can be
7502 reversed with `range(lo, hi).invert()`.
7503 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
7504 renamed to `unwrap_or`.
7505 * std: The `iterator` module was renamed to `iter`.
7506 * std: Integral types now support the `checked_add`, `checked_sub`, and
7507 `checked_mul` operations for detecting overflow.
7508 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
7510 * std: Methods are standardizing on conventions for casting methods:
7511 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
7513 * std: The `CString` type in `c_str` provides new ways to convert to and
7515 * std: `DoubleEndedIterator` can yield elements in two directions.
7516 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
7518 * std: `str::from_bytes` renamed to `str::from_utf8`.
7519 * std: `pop_opt` and `shift_opt` methods added to vectors.
7520 * std: The task-local data interface no longer uses @, and keys are
7521 no longer function pointers.
7522 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
7523 * std: Added `SharedPort` to `comm`.
7524 * std: `Eq` has a default method for `ne`; only `eq` is required
7526 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
7527 is required in implementations.
7528 * std: `is_utf8` performance is improved, impacting many string functions.
7529 * std: `os::MemoryMap` provides cross-platform mmap.
7530 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
7531 are not 'in-bounds' are considered undefined.
7532 * std: Many freestanding functions in `vec` removed in favor of methods.
7533 * std: Many freestanding functions on scalar types removed in favor of
7535 * std: Many options to task builders were removed since they don't make
7536 sense in the new scheduler design.
7537 * std: More containers implement `FromIterator` so can be created by the
7539 * std: More complete atomic types in `unstable::atomics`.
7540 * std: `comm::PortSet` removed.
7541 * std: Mutating methods in the `Set` and `Map` traits have been moved into
7542 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
7543 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
7544 default implementations.
7545 * std: Various `from_str` functions were removed in favor of a generic
7546 `from_str` which is available in the prelude.
7547 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
7548 * extra: `dlist`, the doubly-linked list was modernized.
7549 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
7550 * extra: Added `glob` module, replacing `std::os::glob`.
7551 * extra: `rope` was removed.
7552 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
7553 * extra: `net`, and `timer` were removed. The experimental replacements
7554 are `std::rt::io::net` and `std::rt::io::timer`.
7555 * extra: Iterators implemented for `SmallIntMap`.
7556 * extra: Iterators implemented for `Bitv` and `BitvSet`.
7557 * extra: `SmallIntSet` removed. Use `BitvSet`.
7558 * extra: Performance of JSON parsing greatly improved.
7559 * extra: `semver` updated to SemVer 2.0.0.
7560 * extra: `term` handles more terminals correctly.
7561 * extra: `dbg` module removed.
7562 * extra: `par` module removed.
7563 * extra: `future` was cleaned up, with some method renames.
7564 * extra: Most free functions in `getopts` were converted to methods.
7567 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
7568 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
7569 similarly to gcc's `--march` flag.
7570 * rustc's performance compiling small crates is much better.
7571 * rustpkg has received many improvements.
7572 * rustpkg supports git tags as package IDs.
7573 * rustpkg builds into target-specific directories so it can be used for
7575 * The number of concurrent test tasks is controlled by the environment
7576 variable RUST_TEST_TASKS.
7577 * The test harness can now report metrics for benchmarks.
7578 * All tools have man pages.
7579 * Programs compiled with `--test` now support the `-h` and `--help` flags.
7580 * The runtime uses jemalloc for allocations.
7581 * Segmented stacks are temporarily disabled as part of the transition to
7582 the new runtime. Stack overflows are possible!
7583 * A new documentation backend, rustdoc_ng, is available for use. It is
7584 still invoked through the normal `rustdoc` command.
7587 Version 0.7 (2013-07-03)
7588 =======================
7590 * ~2000 changes, numerous bugfixes
7593 * `impl`s no longer accept a visibility qualifier. Put them on methods
7595 * The borrow checker has been rewritten with flow-sensitivity, fixing
7596 many bugs and inconveniences.
7597 * The `self` parameter no longer implicitly means `&'self self`,
7598 and can be explicitly marked with a lifetime.
7599 * Overloadable compound operators (`+=`, etc.) have been temporarily
7600 removed due to bugs.
7601 * The `for` loop protocol now requires `for`-iterators to return `bool`
7602 so they compose better.
7603 * The `Durable` trait is replaced with the `'static` bounds.
7604 * Trait default methods work more often.
7605 * Structs with the `#[packed]` attribute have byte alignment and
7606 no padding between fields.
7607 * Type parameters bound by `Copy` must now be copied explicitly with
7609 * It is now illegal to move out of a dereferenced unsafe pointer.
7610 * `Option<~T>` is now represented as a nullable pointer.
7611 * `@mut` does dynamic borrow checks correctly.
7612 * The `main` function is only detected at the topmost level of the crate.
7613 The `#[main]` attribute is still valid anywhere.
7614 * Struct fields may no longer be mutable. Use inherited mutability.
7615 * The `#[no_send]` attribute makes a type that would otherwise be
7617 * The `#[no_freeze]` attribute makes a type that would otherwise be
7619 * Unbounded recursion will abort the process after reaching the limit
7620 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
7621 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
7622 are never implicitly copyable.
7623 * `#[static_assert]` makes compile-time assertions about static bools.
7624 * At long last, 'argument modes' no longer exist.
7625 * The rarely used `use mod` statement no longer exists.
7628 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
7630 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
7631 `Rand`, `Zero` and `ToStr` can all be automatically derived with
7633 * The `bytes!` macro returns a vector of bytes for string, u8, char,
7634 and unsuffixed integer literals.
7637 * The `core` crate was renamed to `std`.
7638 * The `std` crate was renamed to `extra`.
7639 * More and improved documentation.
7640 * std: `iterator` module for external iterator objects.
7641 * Many old-style (internal, higher-order function) iterators replaced by
7642 implementations of `Iterator`.
7643 * std: Many old internal vector and string iterators,
7644 incl. `any`, `all`. removed.
7645 * std: The `finalize` method of `Drop` renamed to `drop`.
7646 * std: The `drop` method now takes `&mut self` instead of `&self`.
7647 * std: The prelude no longer re-exports any modules, only types and traits.
7648 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
7649 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
7650 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
7651 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
7652 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
7653 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
7654 * std: Many types implement `Clone`.
7655 * std: `path` type renamed to `Path`.
7656 * std: `mut` module and `Mut` type removed.
7657 * std: Many standalone functions removed in favor of methods and iterators
7658 in `vec`, `str`. In the future methods will also work as functions.
7659 * std: `reinterpret_cast` removed. Use `transmute`.
7660 * std: ascii string handling in `std::ascii`.
7661 * std: `Rand` is implemented for ~/@.
7662 * std: `run` module for spawning processes overhauled.
7663 * std: Various atomic types added to `unstable::atomic`.
7664 * std: Various types implement `Zero`.
7665 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
7666 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
7667 * std: Added `os::mkdir_recursive`.
7668 * std: Added `os::glob` function performs filesystems globs.
7669 * std: `FuzzyEq` renamed to `ApproxEq`.
7670 * std: `Map` now defines `pop` and `swap` methods.
7671 * std: `Cell` constructors converted to static methods.
7672 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
7673 * extra: `flate` module moved from `std` to `extra`.
7674 * extra: `fileinput` module for iterating over a series of files.
7675 * extra: `Complex` number type and `complex` module.
7676 * extra: `Rational` number type and `rational` module.
7677 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
7678 * extra: `term` uses terminfo now, is more correct.
7679 * extra: `arc` functions converted to methods.
7680 * extra: Implementation of fixed output size variations of SHA-2.
7683 * `unused_variable` lint mode for unused variables (default: warn).
7684 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
7686 * `unused_mut` lint mode for identifying unused `mut` qualifiers
7688 * `dead_assignment` lint mode for unread variables (default: warn).
7689 * `unnecessary_allocation` lint mode detects some heap allocations that are
7690 immediately borrowed so could be written without allocating (default: warn).
7691 * `missing_doc` lint mode (default: allow).
7692 * `unreachable_code` lint mode (default: warn).
7693 * The `rusti` command has been rewritten and a number of bugs addressed.
7694 * rustc outputs in color on more terminals.
7695 * rustc accepts a `--link-args` flag to pass arguments to the linker.
7696 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
7697 * Compiling with `-g` will make the binary record information about
7698 dynamic borrowcheck failures for debugging.
7699 * rustdoc has a nicer stylesheet.
7700 * Various improvements to rustdoc.
7701 * Improvements to rustpkg (see the detailed release notes).
7704 Version 0.6 (2013-04-03)
7705 ========================
7707 * ~2100 changes, numerous bugfixes
7710 * The self type parameter in traits is now spelled `Self`
7711 * The `self` parameter in trait and impl methods must now be explicitly
7712 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
7713 * Static methods no longer require the `static` keyword and instead
7714 are distinguished by the lack of a `self` parameter
7715 * Replaced the `Durable` trait with the `'static` lifetime
7716 * The old closure type syntax with the trailing sigil has been
7717 removed in favor of the more consistent leading sigil
7718 * `super` is a keyword, and may be prefixed to paths
7719 * Trait bounds are separated with `+` instead of whitespace
7720 * Traits are implemented with `impl Trait for Type`
7721 instead of `impl Type: Trait`
7722 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
7723 * The `export` keyword has finally been removed
7724 * The `move` keyword has been removed (see "Semantic changes")
7725 * The interior mutability qualifier on vectors, `[mut T]`, has been
7726 removed. Use `&mut [T]`, etc.
7727 * `mut` is no longer valid in `~mut T`. Use inherited mutability
7728 * `fail` is no longer a keyword. Use `fail!()`
7729 * `assert` is no longer a keyword. Use `assert!()`
7730 * `log` is no longer a keyword. use `debug!`, etc.
7731 * 1-tuples may be represented as `(T,)`
7732 * Struct fields may no longer be `mut`. Use inherited mutability,
7733 `@mut T`, `core::mut` or `core::cell`
7734 * `extern mod { ... }` is no longer valid syntax for foreign
7735 function modules. Use extern blocks: `extern { ... }`
7736 * Newtype enums removed. Use tuple-structs.
7737 * Trait implementations no longer support visibility modifiers
7738 * Pattern matching over vectors improved and expanded
7739 * `const` renamed to `static` to correspond to lifetime name,
7740 and make room for future `static mut` unsafe mutable globals.
7741 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
7742 * `Clone` implementations can be automatically generated with
7743 `#[deriving(Clone)]`
7744 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
7745 instead of `foo as Bar`.
7746 * Fixed length vector types are now written as `[int, .. 3]`
7747 instead of `[int * 3]`.
7748 * Fixed length vector types can express the length as a constant
7749 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
7752 * Types with owned pointers or custom destructors move by default,
7753 eliminating the `move` keyword
7754 * All foreign functions are considered unsafe
7755 * &mut is now unaliasable
7756 * Writes to borrowed @mut pointers are prevented dynamically
7758 * The name of the main function can be customized using #[main]
7759 * The default type of an inferred closure is &fn instead of @fn
7760 * `use` statements may no longer be "chained" - they cannot import
7761 identifiers imported by previous `use` statements
7762 * `use` statements are crate relative, importing from the "top"
7763 of the crate by default. Paths may be prefixed with `super::`
7764 or `self::` to change the search behavior.
7765 * Method visibility is inherited from the implementation declaration
7766 * Structural records have been removed
7767 * Many more types can be used in static items, including enums
7768 'static-lifetime pointers and vectors
7769 * Pattern matching over vectors improved and expanded
7770 * Typechecking of closure types has been overhauled to
7771 improve inference and eliminate unsoundness
7772 * Macros leave scope at the end of modules, unless that module is
7773 tagged with #[macro_escape]
7776 * Added big integers to `std::bigint`
7777 * Removed `core::oldcomm` module
7778 * Added pipe-based `core::comm` module
7779 * Numeric traits have been reorganized under `core::num`
7780 * `vec::slice` finally returns a slice
7781 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7782 * Containers reorganized around traits in `core::container`
7783 * `core::dvec` removed, `~[T]` is a drop-in replacement
7784 * `core::send_map` renamed to `core::hashmap`
7785 * `std::map` removed; replaced with `core::hashmap`
7786 * `std::treemap` reimplemented as an owned balanced tree
7787 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7788 * `core::trie` added as a fast ordered map for integer keys
7789 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7790 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7791 overload the comparison operators, whereas `TotalOrd` is used
7792 by certain container types
7795 * Replaced the 'cargo' package manager with 'rustpkg'
7796 * Added all-purpose 'rust' tool
7797 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7798 * rustc now *attempts* to offer spelling suggestions
7799 * Improved support for ARM and Android
7800 * Preliminary MIPS backend
7801 * Improved foreign function ABI implementation for x86, x86_64
7802 * Various memory usage improvements
7803 * Rust code may be embedded in foreign code under limited circumstances
7804 * Inline assembler supported by new asm!() syntax extension.
7807 Version 0.5 (2012-12-21)
7808 ===========================
7810 * ~900 changes, numerous bugfixes
7813 * Removed `<-` move operator
7814 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7815 * Removed old fixed length vector syntax - `[T]/N`
7816 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7817 * Macros may now expand to items and statements
7818 * `a.b()` is always parsed as a method call, never as a field projection
7819 * `Eq` and `IterBytes` implementations can be automatically generated
7820 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7821 * Removed the special crate language for `.rc` files
7822 * Function arguments may consist of any irrefutable pattern
7825 * `&` and `~` pointers may point to objects
7826 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7827 * Enum variants may be structs
7828 * Destructors can be added to all nominal types with the Drop trait
7829 * Structs and nullary enum variants may be constants
7830 * Values that cannot be implicitly copied are now automatically moved
7831 without writing `move` explicitly
7832 * `&T` may now be coerced to `*T`
7833 * Coercions happen in `let` statements as well as function calls
7834 * `use` statements now take crate-relative paths
7835 * The module and type namespaces have been merged so that static
7836 method names can be resolved under the trait in which they are
7839 * Improved support for language features
7840 * Trait inheritance works in many scenarios
7841 * More support for explicit self arguments in methods - `self`, `&self`
7842 `@self`, and `~self` all generally work as expected
7843 * Static methods work in more situations
7844 * Experimental: Traits may declare default methods for the implementations
7848 * New condition handling system in `core::condition`
7849 * Timsort added to `std::sort`
7850 * New priority queue, `std::priority_queue`
7851 * Pipes for serializable types, `std::flatpipes'
7852 * Serialization overhauled to be trait-based
7853 * Expanded `getopts` definitions
7854 * Moved futures to `std`
7855 * More functions are pure now
7856 * `core::comm` renamed to `oldcomm`. Still deprecated
7857 * `rustdoc` and `cargo` are libraries now
7860 * Added a preliminary REPL, `rusti`
7861 * License changed from MIT to dual MIT/APL2
7864 Version 0.4 (2012-10-15)
7865 ==========================
7867 * ~2000 changes, numerous bugfixes
7870 * All keywords are now strict and may not be used as identifiers anywhere
7871 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7872 'of', 'with', 'to', 'class'.
7873 * Classes are replaced with simpler structs
7874 * Explicit method self types
7875 * `ret` became `return` and `alt` became `match`
7876 * `import` is now `use`; `use is now `extern mod`
7877 * `extern mod { ... }` is now `extern { ... }`
7878 * `use mod` is the recommended way to import modules
7879 * `pub` and `priv` replace deprecated export lists
7880 * The syntax of `match` pattern arms now uses fat arrow (=>)
7881 * `main` no longer accepts an args vector; use `os::args` instead
7884 * Trait implementations are now coherent, ala Haskell typeclasses
7885 * Trait methods may be static
7886 * Argument modes are deprecated
7887 * Borrowed pointers are much more mature and recommended for use
7888 * Strings and vectors in the static region are stored in constant memory
7889 * Typestate was removed
7890 * Resolution rewritten to be more reliable
7891 * Support for 'dual-mode' data structures (freezing and thawing)
7894 * Most binary operators can now be overloaded via the traits in
7896 * `std::net::url` for representing URLs
7897 * Sendable hash maps in `core::send_map`
7898 * `core::task' gained a (currently unsafe) task-local storage API
7901 * An efficient new intertask communication primitive called the pipe,
7902 along with a number of higher-level channel types, in `core::pipes`
7903 * `std::arc`, an atomically reference counted, immutable, shared memory
7905 * `std::sync`, various exotic synchronization tools based on arcs and pipes
7906 * Futures are now based on pipes and sendable
7907 * More robust linked task failure
7908 * Improved task builder API
7911 * Improved error reporting
7912 * Preliminary JIT support
7913 * Preliminary work on precise GC
7914 * Extensive architectural improvements to rustc
7915 * Begun a transition away from buggy C++-based reflection (shape) code to
7916 Rust-based (visitor) code
7917 * All hash functions and tables converted to secure, randomized SipHash
7920 Version 0.3 (2012-07-12)
7921 ========================
7923 * ~1900 changes, numerous bugfixes
7925 * New coding conveniences
7926 * Integer-literal suffix inference
7927 * Per-item control over warnings, errors
7928 * #[cfg(windows)] and #[cfg(unix)] attributes
7929 * Documentation comments
7930 * More compact closure syntax
7931 * 'do' expressions for treating higher-order functions as
7933 * *-patterns (wildcard extended to all constructor fields)
7936 * Name resolution pass and exhaustiveness checker rewritten
7937 * Region pointers and borrow checking supersede alias
7939 * Init-ness checking is now provided by a region-based liveness
7940 pass instead of the typestate pass; same for last-use analysis
7941 * Extensive work on region pointers
7943 * Experimental new language features
7944 * Slices and fixed-size, interior-allocated vectors
7945 * #!-comments for lang versioning, shell execution
7946 * Destructors and iface implementation for classes;
7947 type-parameterized classes and class methods
7948 * 'const' type kind for types that can be used to implement
7949 shared-memory concurrency patterns
7953 * Removal of various obsolete features
7954 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
7955 'crust', 'native' (now 'extern'), 'cont' (now 'again')
7957 * Constructs: do-while loops ('do' repurposed), fn binding,
7958 resources (replaced by destructors)
7960 * Compiler reorganization
7961 * Syntax-layer of compiler split into separate crate
7962 * Clang (from LLVM project) integrated into build
7963 * Typechecker split into sub-modules
7966 * New time functions
7967 * Extension methods for many built-in types
7968 * Arc: atomic-refcount read-only / exclusive-use shared cells
7969 * Par: parallel map and search routines
7970 * Extensive work on libuv interface
7971 * Much vector code moved to libraries
7972 * Syntax extensions: #line, #col, #file, #mod, #stringify,
7973 #include, #include_str, #include_bin
7976 * Cargo automatically resolves dependencies
7979 Version 0.2 (2012-03-29)
7980 =========================
7982 * >1500 changes, numerous bugfixes
7984 * New docs and doc tooling
7986 * New port: FreeBSD x86_64
7988 * Compilation model enhancements
7989 * Generics now specialized, multiply instantiated
7990 * Functions now inlined across separate crates
7992 * Scheduling, stack and threading fixes
7993 * Noticeably improved message-passing performance
7994 * Explicit schedulers
7998 * Experimental new language features
7999 * Operator overloading
8003 * Various language extensions
8004 * C-callback function types: 'crust fn ...'
8005 * Infinite-loop construct: 'loop { ... }'
8006 * Shorten 'mutable' to 'mut'
8007 * Required mutable-local qualifier: 'let mut ...'
8008 * Basic glob-exporting: 'export foo::*;'
8009 * Alt now exhaustive, 'alt check' for runtime-checked
8010 * Block-function form of 'for' loop, with 'break' and 'ret'.
8013 * AST quasi-quote syntax extension
8014 * Revived libuv interface
8015 * New modules: core::{future, iter}, std::arena
8016 * Merged per-platform std::{os*, fs*} to core::{libc, os}
8017 * Extensive cleanup, regularization in libstd, libcore
8020 Version 0.1 (2012-01-20)
8021 ===============================
8023 * Most language features work, including:
8024 * Unique pointers, unique closures, move semantics
8025 * Interface-constrained generics
8026 * Static interface dispatch
8028 * Multithread task scheduling
8029 * Typestate predicates
8030 * Failure unwinding, destructors
8031 * Pattern matching and destructuring assignment
8032 * Lightweight block-lambda syntax
8033 * Preliminary macro-by-example
8035 * Compiler works with the following configurations:
8036 * Linux: x86 and x86_64 hosts and targets
8037 * macOS: x86 and x86_64 hosts and targets
8038 * Windows: x86 hosts and targets
8040 * Cross compilation / multi-target configuration supported.
8042 * Preliminary API-documentation and package-management tools included.
8046 * Documentation is incomplete.
8048 * Performance is below intended target.
8050 * Standard library APIs are subject to extensive change, reorganization.
8052 * Language-level versioning is not yet operational - future code will