1 Version 1.37.0 (2019-08-15)
2 ==========================
6 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
7 [`Box`][62228], or an [array][62235] and unused.
8 - [You can now use the `cfg` and `cfg_attr` attributes on
9 generic parameters.][61547]
10 - [You can now use enum variants through type alias.][61682] e.g. You can
13 type MyOption = Option<u8>;
15 fn increment_or_zero(x: MyOption) -> u8 {
17 MyOption::Some(y) => y + 1,
22 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
24 - [You can now use `#[repr(align(X)]` on enums.][61229]
25 - [The `?` Kleene macro operator is now available in the
30 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
31 and `-C profile-use` flags.][61268] For more information on how to use profile
32 guided optimization, please refer to the [rustc book][rustc-book-pgo].
33 - [The `rust-lldb` wrapper script should now work again.][61827]
37 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
41 - [`BufReader::buffer`]
42 - [`BufWriter::buffer`]
44 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
45 - [`DoubleEndedIterator::nth_back`]
47 - [`Wrapping::reverse_bits`]
48 - [`i128::reverse_bits`]
49 - [`i16::reverse_bits`]
50 - [`i32::reverse_bits`]
51 - [`i64::reverse_bits`]
52 - [`i8::reverse_bits`]
53 - [`isize::reverse_bits`]
54 - [`slice::copy_within`]
55 - [`u128::reverse_bits`]
56 - [`u16::reverse_bits`]
57 - [`u32::reverse_bits`]
58 - [`u64::reverse_bits`]
59 - [`u8::reverse_bits`]
60 - [`usize::reverse_bits`]
64 - [`Cargo.lock` files are now included by default when publishing executable crates
65 with executables.][cargo/7026]
66 - [You can now specify `default-run="foo"` in `[package]` to specify the
67 default executable to use for `cargo run`.][cargo/7056]
74 - [Using `...` for inclusive range patterns will now warn by default.][61342]
75 Please transition your code to using the `..=` syntax for inclusive
77 - [Using a trait object without the `dyn` will now warn by default.][61203]
78 Please transition your code to use `dyn Trait` for trait objects instead.
80 [62228]: https://github.com/rust-lang/rust/pull/62228/
81 [62235]: https://github.com/rust-lang/rust/pull/62235/
82 [61802]: https://github.com/rust-lang/rust/pull/61802/
83 [61827]: https://github.com/rust-lang/rust/pull/61827/
84 [61547]: https://github.com/rust-lang/rust/pull/61547/
85 [61682]: https://github.com/rust-lang/rust/pull/61682/
86 [61268]: https://github.com/rust-lang/rust/pull/61268/
87 [61342]: https://github.com/rust-lang/rust/pull/61342/
88 [61347]: https://github.com/rust-lang/rust/pull/61347/
89 [61100]: https://github.com/rust-lang/rust/pull/61100/
90 [61203]: https://github.com/rust-lang/rust/pull/61203/
91 [61229]: https://github.com/rust-lang/rust/pull/61229/
92 [60932]: https://github.com/rust-lang/rust/pull/60932/
93 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
94 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
95 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
96 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
97 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
98 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
99 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
100 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
101 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
102 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
103 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
104 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
105 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
106 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
107 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
108 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
109 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
110 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
111 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
112 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
113 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
114 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
115 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
116 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
119 Version 1.36.0 (2019-07-04)
120 ==========================
124 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
125 - [The order of traits in trait objects no longer affects the semantics of that
126 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
127 `dyn fmt::Debug + Send`, where this was previously not the case.
131 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
132 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
133 - [`mem::needs_drop` is now available as a const fn.][60364]
134 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
135 - [`String` now implements `BorrowMut<str>`.][60404]
136 - [`io::Cursor` now implements `Default`.][60234]
137 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
138 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
139 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
140 environment has access to heap memory allocation.
141 - [`String` now implements `From<&String>`.][59825]
142 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
143 return a tuple of each argument when there is multiple arguments.
144 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
149 - [`VecDeque::rotate_left`]
150 - [`VecDeque::rotate_right`]
151 - [`Iterator::copied`]
154 - [`Read::read_vectored`]
155 - [`Write::write_vectored`]
156 - [`str::as_mut_ptr`]
157 - [`mem::MaybeUninit`]
158 - [`pointer::align_offset`]
162 - [`task::RawWakerVTable`]
168 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
169 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
171 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
175 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
182 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
183 longer recommended, and will be deprecated in 1.39.0.
185 [60318]: https://github.com/rust-lang/rust/pull/60318/
186 [60364]: https://github.com/rust-lang/rust/pull/60364/
187 [60370]: https://github.com/rust-lang/rust/pull/60370/
188 [60404]: https://github.com/rust-lang/rust/pull/60404/
189 [60234]: https://github.com/rust-lang/rust/pull/60234/
190 [60244]: https://github.com/rust-lang/rust/pull/60244/
191 [58623]: https://github.com/rust-lang/rust/pull/58623/
192 [59648]: https://github.com/rust-lang/rust/pull/59648/
193 [59675]: https://github.com/rust-lang/rust/pull/59675/
194 [59825]: https://github.com/rust-lang/rust/pull/59825/
195 [59826]: https://github.com/rust-lang/rust/pull/59826/
196 [59445]: https://github.com/rust-lang/rust/pull/59445/
197 [59114]: https://github.com/rust-lang/rust/pull/59114/
198 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
199 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
200 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
201 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
202 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
203 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
204 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
205 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
206 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
207 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
208 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
209 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
210 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
211 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
212 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
213 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
214 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
215 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
216 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
217 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
220 Version 1.35.0 (2019-05-23)
221 ==========================
225 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
226 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
227 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
229 unsafe fn call_unsafe(func: unsafe fn()) {
234 unsafe { call_unsafe(|| {}); }
241 - [Added the `armv6-unknown-freebsd-gnueabihf` and
242 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
243 - [Added the `wasm32-unknown-wasi` target.][59464]
248 - [`Thread` will now show its ID in `Debug` output.][59460]
249 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
250 - [`alloc::System` now implements `Default`.][59451]
251 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
253 - [`char::{ToLowercase, ToUppercase}` now
254 implement `ExactSizeIterator`.][58778]
255 - [All `NonZero` numeric types now implement `FromStr`.][58717]
256 - [Removed the `Read` trait bounds
257 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
258 - [You can now call the `dbg!` macro without any parameters to print the file
259 and line where it is called.][57847]
260 - [In place ASCII case conversions are now up to 4× faster.][59283]
261 e.g. `str::make_ascii_lowercase`
262 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
269 - [`RefCell::replace_with`]
270 - [`RefCell::map_split`]
272 - [`Range::contains`]
273 - [`RangeFrom::contains`]
274 - [`RangeTo::contains`]
275 - [`RangeInclusive::contains`]
276 - [`RangeToInclusive::contains`]
281 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
282 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
287 - [The Rust toolchain is now available natively for musl based distros.][58575]
289 [59460]: https://github.com/rust-lang/rust/pull/59460/
290 [59464]: https://github.com/rust-lang/rust/pull/59464/
291 [59500]: https://github.com/rust-lang/rust/pull/59500/
292 [59512]: https://github.com/rust-lang/rust/pull/59512/
293 [59580]: https://github.com/rust-lang/rust/pull/59580/
294 [59283]: https://github.com/rust-lang/rust/pull/59283/
295 [59451]: https://github.com/rust-lang/rust/pull/59451/
296 [59076]: https://github.com/rust-lang/rust/pull/59076/
297 [58778]: https://github.com/rust-lang/rust/pull/58778/
298 [58717]: https://github.com/rust-lang/rust/pull/58717/
299 [58369]: https://github.com/rust-lang/rust/pull/58369/
300 [58423]: https://github.com/rust-lang/rust/pull/58423/
301 [58080]: https://github.com/rust-lang/rust/pull/58080/
302 [57847]: https://github.com/rust-lang/rust/pull/57847/
303 [58575]: https://github.com/rust-lang/rust/pull/58575
304 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
305 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
306 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
307 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
308 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
309 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
310 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
311 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
312 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
313 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
314 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
315 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
317 Version 1.34.2 (2019-05-14)
318 ===========================
320 * [Destabilize the `Error::type_id` function due to a security
321 vulnerability][60785] ([CVE-2019-12083])
323 [60785]: https://github.com/rust-lang/rust/pull/60785
324 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
326 Version 1.34.1 (2019-04-25)
327 ===========================
329 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
330 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
331 * [Fix Clippy panic when checking some macros][clippy/3805]
333 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
334 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
335 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
337 Version 1.34.0 (2019-04-11)
338 ==========================
342 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
343 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
345 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
346 `#[attr{}]` procedural macros.][57367]
347 - [You can now write `extern crate self as foo;`][57407] to import your
348 crate's root into the extern prelude.
353 - [You can now target `riscv64imac-unknown-none-elf` and
354 `riscv64gc-unknown-none-elf`.][58406]
355 - [You can now enable linker plugin LTO optimisations with
356 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
357 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
359 - [You can now target `powerpc64-unknown-freebsd`.][57809]
364 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
365 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
366 the `Hash` trait to create an iterator.
367 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
368 methods.][58421] Most notably you no longer require the `Ord` trait to create
370 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
371 for all numeric types.][58044]
372 - [Indexing a `str` is now generic over all types that
373 implement `SliceIndex<str>`.][57604]
374 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
375 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
376 produce a warning if their returning type is unused.
377 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
378 `overflowing_pow` are now available for all numeric types.][57873] These are
379 equivalent to methods such as `wrapping_add` for the `pow` operation.
388 * [`atomic::AtomicI16`]
389 * [`atomic::AtomicI32`]
390 * [`atomic::AtomicI64`]
391 * [`atomic::AtomicI8`]
392 * [`atomic::AtomicU16`]
393 * [`atomic::AtomicU32`]
394 * [`atomic::AtomicU64`]
395 * [`atomic::AtomicU8`]
396 * [`convert::Infallible`]
397 * [`convert::TryFrom`]
398 * [`convert::TryInto`]
400 * [`iter::successors`]
401 * [`num::NonZeroI128`]
402 * [`num::NonZeroI16`]
403 * [`num::NonZeroI32`]
404 * [`num::NonZeroI64`]
406 * [`num::NonZeroIsize`]
407 * [`slice::sort_by_cached_key`]
408 * [`str::escape_debug`]
409 * [`str::escape_default`]
410 * [`str::escape_unicode`]
411 * [`str::split_ascii_whitespace`]
414 * [`Instant::checked_add`]
415 * [`Instant::checked_sub`]
416 * [`SystemTime::checked_add`]
417 * [`SystemTime::checked_sub`]
421 - [You can now use alternative registries to crates.io.][cargo/6654]
425 - [You can now use the `?` operator in your documentation tests without manually
426 adding `fn main() -> Result<(), _> {}`.][56470]
430 - [`Command::before_exec` is being replaced by the unsafe method
431 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
432 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
433 can now use `const` functions in `static` variables.
435 [58370]: https://github.com/rust-lang/rust/pull/58370/
436 [58406]: https://github.com/rust-lang/rust/pull/58406/
437 [58421]: https://github.com/rust-lang/rust/pull/58421/
438 [58166]: https://github.com/rust-lang/rust/pull/58166/
439 [58044]: https://github.com/rust-lang/rust/pull/58044/
440 [58057]: https://github.com/rust-lang/rust/pull/58057/
441 [58059]: https://github.com/rust-lang/rust/pull/58059/
442 [57809]: https://github.com/rust-lang/rust/pull/57809/
443 [57873]: https://github.com/rust-lang/rust/pull/57873/
444 [57604]: https://github.com/rust-lang/rust/pull/57604/
445 [57367]: https://github.com/rust-lang/rust/pull/57367/
446 [57407]: https://github.com/rust-lang/rust/pull/57407/
447 [57425]: https://github.com/rust-lang/rust/pull/57425/
448 [57106]: https://github.com/rust-lang/rust/pull/57106/
449 [56470]: https://github.com/rust-lang/rust/pull/56470/
450 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
451 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
452 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
453 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
454 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
455 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
456 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
457 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
458 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
459 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
460 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
461 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
462 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
463 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
464 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
465 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
466 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
467 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
468 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
469 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
470 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
471 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
472 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
473 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
474 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
475 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
476 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
477 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
478 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
479 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
480 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
483 Version 1.33.0 (2019-02-28)
484 ==========================
488 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
489 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
490 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
491 E.g. You can have match statement on a `u8` that covers `0..=255` and
492 you would no longer be required to have a `_ => unreachable!()` case.
493 - [You can now have multiple patterns in `if let` and `while let`
494 expressions.][57532] You can do this with the same syntax as a `match`
504 let state = Creature::Crab("Ferris");
506 if let Creature::Crab(name) | Creature::Person(name) = state {
507 println!("This creature's name is: {}", name);
511 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
512 this feature will by default produce a warning as this behaviour can be
513 unintuitive. E.g. `if let _ = 5 {}`
514 - [You can now use `let` bindings, assignments, expression statements,
515 and irrefutable pattern destructuring in const functions.][57175]
516 - [You can now call unsafe const functions.][57067] E.g.
518 const unsafe fn foo() -> i32 { 5 }
519 const fn bar() -> i32 {
523 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
524 E.g. `#[cfg_attr(all(), must_use, optimize)]`
525 - [You can now specify a specific alignment with the `#[repr(packed)]`
526 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
527 with an alignment of 2 bytes and a size of 6 bytes.
528 - [You can now import an item from a module as an `_`.][56303] This allows you to
529 import a trait's impls, and not have the name in the namespace. E.g.
531 use std::io::Read as _;
533 // Allowed as there is only one `Read` in the module.
536 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
540 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
541 command line argument.][56351]
542 - [The minimum required LLVM version has been bumped to 6.0.][56642]
543 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
544 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
545 tier 2 support.][57130] Visit the [platform support][platform-support] page for
546 information on Rust's platform support.
547 - [Added support for the `thumbv7neon-linux-androideabi` and
548 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
549 - [Added support for the `x86_64-unknown-uefi` target.][56769]
553 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
554 functions for all numeric types.][57566]
555 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
556 are now `const` functions for all numeric types.][57105]
557 - [The methods `is_positive` and `is_negative` are now `const` functions for
558 all signed numeric types.][57105]
559 - [The `get` method for all `NonZero` types is now `const`.][57167]
560 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
561 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
562 numeric types.][57234]
563 - [`Ipv4Addr::new` is now a `const` function][57234]
567 - [`unix::FileExt::read_exact_at`]
568 - [`unix::FileExt::write_all_at`]
569 - [`Option::transpose`]
570 - [`Result::transpose`]
571 - [`convert::identity`]
574 - [`marker::PhantomPinned`]
575 - [`Vec::resize_with`]
576 - [`VecDeque::resize_with`]
577 - [`Duration::as_millis`]
578 - [`Duration::as_micros`]
579 - [`Duration::as_nanos`]
584 - [You can now publish crates that require a feature flag to compile with
585 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
586 - [Cargo should now rebuild a crate if a file was modified during the initial
591 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
592 are now deprecated in the standard library, and their usage will now produce a warning.
593 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
595 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
597 - [Libtest no longer creates a new thread for each test when
598 `--test-threads=1`. It also runs the tests in deterministic order][56243]
600 [55982]: https://github.com/rust-lang/rust/pull/55982/
601 [56243]: https://github.com/rust-lang/rust/pull/56243
602 [56303]: https://github.com/rust-lang/rust/pull/56303/
603 [56351]: https://github.com/rust-lang/rust/pull/56351/
604 [56362]: https://github.com/rust-lang/rust/pull/56362
605 [56642]: https://github.com/rust-lang/rust/pull/56642/
606 [56769]: https://github.com/rust-lang/rust/pull/56769/
607 [56805]: https://github.com/rust-lang/rust/pull/56805
608 [56947]: https://github.com/rust-lang/rust/pull/56947/
609 [57049]: https://github.com/rust-lang/rust/pull/57049/
610 [57067]: https://github.com/rust-lang/rust/pull/57067/
611 [57105]: https://github.com/rust-lang/rust/pull/57105
612 [57130]: https://github.com/rust-lang/rust/pull/57130/
613 [57167]: https://github.com/rust-lang/rust/pull/57167/
614 [57175]: https://github.com/rust-lang/rust/pull/57175/
615 [57234]: https://github.com/rust-lang/rust/pull/57234/
616 [57332]: https://github.com/rust-lang/rust/pull/57332/
617 [57465]: https://github.com/rust-lang/rust/pull/57465/
618 [57532]: https://github.com/rust-lang/rust/pull/57532/
619 [57535]: https://github.com/rust-lang/rust/pull/57535/
620 [57566]: https://github.com/rust-lang/rust/pull/57566/
621 [57615]: https://github.com/rust-lang/rust/pull/57615/
622 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
623 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
624 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
625 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
626 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
627 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
628 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
629 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
630 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
631 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
632 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
633 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
634 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
635 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
636 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
637 [platform-support]: https://forge.rust-lang.org/platform-support.html
639 Version 1.32.0 (2019-01-17)
640 ==========================
645 - [You can now use the `?` operator in macro definitions.][56245] The `?`
646 operator allows you to specify zero or one repetitions similar to the `*` and
648 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
649 now always resolve to the item (`enum`, `struct`, etc.) available in the
650 module if present, before resolving to a external crate or an item the prelude.][56759]
653 enum Color { Red, Green, Blue }
659 - [You can now match against `PhantomData<T>` types.][55837]
660 - [You can now match against literals in macros with the `literal`
661 specifier.][56072] This will match against a literal of any type.
662 E.g. `1`, `'A'`, `"Hello World"`
663 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
665 struct Point(i32, i32);
668 pub fn new(x: i32, y: i32) -> Self {
672 pub fn is_origin(&self) -> bool {
680 - [Self can also now be used in type definitions.][56366] E.g.
684 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
687 Cons(T, Box<Self>) // likewise here
690 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
691 a `impl Trait` or `dyn Trait` is returned and unused in the program.
695 - [The default allocator has changed from jemalloc to the default allocator on
696 your system.][55238] The compiler itself on Linux & macOS will still use
697 jemalloc, but programs compiled with it will use the system allocator.
698 - [Added the `aarch64-pc-windows-msvc` target.][55702]
702 - [`PathBuf` now implements `FromStr`.][55148]
703 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
704 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
705 easily debug expressions in your rust program. E.g.
708 let b = dbg!(a * 2) + 1;
709 // ^-- prints: [src/main.rs:4] a * 2 = 4
713 The following APIs are now `const` functions and can be used in a
717 - [`UnsafeCell::get`]
720 - [`ManuallyDrop::new`]
721 - [`ManuallyDrop::into_inner`]
722 - [`RangeInclusive::start`]
723 - [`RangeInclusive::end`]
724 - [`NonNull::as_ptr`]
727 - [`Duration::as_secs`]
728 - [`Duration::subsec_millis`]
729 - [`Duration::subsec_micros`]
730 - [`Duration::subsec_nanos`]
732 - [`Ipv4Addr::is_unspecified`]
734 - [`Ipv6Addr::octets`]
738 - [`i8::to_be_bytes`]
739 - [`i8::to_le_bytes`]
740 - [`i8::to_ne_bytes`]
741 - [`i8::from_be_bytes`]
742 - [`i8::from_le_bytes`]
743 - [`i8::from_ne_bytes`]
744 - [`i16::to_be_bytes`]
745 - [`i16::to_le_bytes`]
746 - [`i16::to_ne_bytes`]
747 - [`i16::from_be_bytes`]
748 - [`i16::from_le_bytes`]
749 - [`i16::from_ne_bytes`]
750 - [`i32::to_be_bytes`]
751 - [`i32::to_le_bytes`]
752 - [`i32::to_ne_bytes`]
753 - [`i32::from_be_bytes`]
754 - [`i32::from_le_bytes`]
755 - [`i32::from_ne_bytes`]
756 - [`i64::to_be_bytes`]
757 - [`i64::to_le_bytes`]
758 - [`i64::to_ne_bytes`]
759 - [`i64::from_be_bytes`]
760 - [`i64::from_le_bytes`]
761 - [`i64::from_ne_bytes`]
762 - [`i128::to_be_bytes`]
763 - [`i128::to_le_bytes`]
764 - [`i128::to_ne_bytes`]
765 - [`i128::from_be_bytes`]
766 - [`i128::from_le_bytes`]
767 - [`i128::from_ne_bytes`]
768 - [`isize::to_be_bytes`]
769 - [`isize::to_le_bytes`]
770 - [`isize::to_ne_bytes`]
771 - [`isize::from_be_bytes`]
772 - [`isize::from_le_bytes`]
773 - [`isize::from_ne_bytes`]
774 - [`u8::to_be_bytes`]
775 - [`u8::to_le_bytes`]
776 - [`u8::to_ne_bytes`]
777 - [`u8::from_be_bytes`]
778 - [`u8::from_le_bytes`]
779 - [`u8::from_ne_bytes`]
780 - [`u16::to_be_bytes`]
781 - [`u16::to_le_bytes`]
782 - [`u16::to_ne_bytes`]
783 - [`u16::from_be_bytes`]
784 - [`u16::from_le_bytes`]
785 - [`u16::from_ne_bytes`]
786 - [`u32::to_be_bytes`]
787 - [`u32::to_le_bytes`]
788 - [`u32::to_ne_bytes`]
789 - [`u32::from_be_bytes`]
790 - [`u32::from_le_bytes`]
791 - [`u32::from_ne_bytes`]
792 - [`u64::to_be_bytes`]
793 - [`u64::to_le_bytes`]
794 - [`u64::to_ne_bytes`]
795 - [`u64::from_be_bytes`]
796 - [`u64::from_le_bytes`]
797 - [`u64::from_ne_bytes`]
798 - [`u128::to_be_bytes`]
799 - [`u128::to_le_bytes`]
800 - [`u128::to_ne_bytes`]
801 - [`u128::from_be_bytes`]
802 - [`u128::from_le_bytes`]
803 - [`u128::from_ne_bytes`]
804 - [`usize::to_be_bytes`]
805 - [`usize::to_le_bytes`]
806 - [`usize::to_ne_bytes`]
807 - [`usize::from_be_bytes`]
808 - [`usize::from_le_bytes`]
809 - [`usize::from_ne_bytes`]
813 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
814 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
818 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
822 - [The argument types for AVX's
823 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
824 been changed from `*const` to `*mut` as the previous implementation
828 [55148]: https://github.com/rust-lang/rust/pull/55148/
829 [55238]: https://github.com/rust-lang/rust/pull/55238/
830 [55280]: https://github.com/rust-lang/rust/pull/55280/
831 [55610]: https://github.com/rust-lang/rust/pull/55610/
832 [55663]: https://github.com/rust-lang/rust/pull/55663/
833 [55702]: https://github.com/rust-lang/rust/pull/55702/
834 [55837]: https://github.com/rust-lang/rust/pull/55837/
835 [55843]: https://github.com/rust-lang/rust/pull/55843/
836 [56072]: https://github.com/rust-lang/rust/pull/56072/
837 [56245]: https://github.com/rust-lang/rust/pull/56245/
838 [56365]: https://github.com/rust-lang/rust/pull/56365/
839 [56366]: https://github.com/rust-lang/rust/pull/56366/
840 [56395]: https://github.com/rust-lang/rust/pull/56395/
841 [56759]: https://github.com/rust-lang/rust/pull/56759/
842 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
843 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
844 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
845 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
846 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
847 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
848 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
849 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
850 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
851 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
852 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
853 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
854 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
855 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
856 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
857 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
858 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
859 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
860 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
861 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
862 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
863 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
864 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
865 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
866 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
867 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
868 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
869 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
870 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
871 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
872 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
873 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
874 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
875 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
876 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
877 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
878 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
879 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
880 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
881 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
882 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
883 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
884 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
885 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
886 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
887 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
888 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
889 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
890 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
891 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
892 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
893 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
894 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
895 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
896 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
897 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
898 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
899 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
900 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
901 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
902 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
903 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
904 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
905 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
906 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
907 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
908 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
909 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
910 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
911 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
912 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
913 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
914 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
915 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
916 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
917 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
918 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
919 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
920 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
921 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
922 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
923 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
924 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
925 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
926 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
927 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
928 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
929 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
930 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
931 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
932 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
933 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
934 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
937 Version 1.31.1 (2018-12-20)
938 ===========================
940 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
941 - [Fix broken go-to-definition in RLS][rls/1171]
942 - [Fix infinite loop on hover in RLS][rls/1170]
944 [56562]: https://github.com/rust-lang/rust/pull/56562
945 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
946 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
948 Version 1.31.0 (2018-12-06)
949 ==========================
953 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
954 - [New lifetime elision rules now allow for eliding lifetimes in functions and
955 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
956 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
958 - [You can now define and use `const` functions.][54835] These are currently
959 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
960 [language reference][const-reference] for what exactly is available.
961 - [You can now use tool lints, which allow you to scope lints from external
962 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
963 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
964 a crate, not just in exported functions.][54451]
965 - [You can now use parentheses in pattern matches.][54497]
969 - [Updated musl to 1.1.20][54430]
973 - [You can now convert `num::NonZero*` types to their raw equivalents using the
974 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
975 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
976 into `Option<&mut T>` using the `From` trait.][53218]
977 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
982 - [`slice::align_to`]
983 - [`slice::align_to_mut`]
984 - [`slice::chunks_exact`]
985 - [`slice::chunks_exact_mut`]
987 - [`slice::rchunks_mut`]
988 - [`slice::rchunks_exact`]
989 - [`slice::rchunks_exact_mut`]
990 - [`Option::replace`]
994 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
995 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
996 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
998 [52813]: https://github.com/rust-lang/rust/pull/52813/
999 [53218]: https://github.com/rust-lang/rust/pull/53218/
1000 [53555]: https://github.com/rust-lang/rust/issues/53555/
1001 [54057]: https://github.com/rust-lang/rust/pull/54057/
1002 [54240]: https://github.com/rust-lang/rust/pull/54240/
1003 [54430]: https://github.com/rust-lang/rust/pull/54430/
1004 [54451]: https://github.com/rust-lang/rust/pull/54451/
1005 [54497]: https://github.com/rust-lang/rust/pull/54497/
1006 [54778]: https://github.com/rust-lang/rust/pull/54778/
1007 [54835]: https://github.com/rust-lang/rust/pull/54835/
1008 [54870]: https://github.com/rust-lang/rust/pull/54870/
1009 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
1010 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
1011 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
1012 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
1013 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
1014 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
1015 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1016 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
1017 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1018 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
1019 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
1020 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
1021 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
1022 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
1024 Version 1.30.1 (2018-11-08)
1025 ===========================
1027 - [Fixed overflow ICE in rustdoc][54199]
1028 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
1030 [54199]: https://github.com/rust-lang/rust/pull/54199
1031 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
1033 Version 1.30.0 (2018-10-25)
1034 ==========================
1038 - [Procedural macros are now available.][52081] These kinds of macros allow for
1039 more powerful code generation. There is a [new chapter available][proc-macros]
1040 in the Rust Programming Language book that goes further in depth.
1041 - [You can now use keywords as identifiers using the raw identifiers
1042 syntax (`r#`),][53236] e.g. `let r#for = true;`
1043 - [Using anonymous parameters in traits is now deprecated with a warning and
1044 will be a hard error in the 2018 edition.][53272]
1045 - [You can now use `crate` in paths.][54404] This allows you to refer to the
1046 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
1047 - [Using a external crate no longer requires being prefixed with `::`.][54404]
1048 Previously, using a external crate in a module without a use statement
1049 required `let json = ::serde_json::from_str(foo);` but can now be written
1050 as `let json = serde_json::from_str(foo);`.
1051 - [You can now apply the `#[used]` attribute to static items to prevent the
1052 compiler from optimising them away, even if they appear to be unused,][51363]
1053 e.g. `#[used] static FOO: u32 = 1;`
1054 - [You can now import and reexport macros from other crates with the `use`
1055 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
1056 the root module of the crate. If your macro relies on calling other local
1057 macros, it is recommended to export with the
1058 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
1060 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
1061 using the `vis` specifier.][53370]
1062 - [Non-macro attributes now allow all forms of literals, not just
1063 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
1064 write `#[attr(true)]`.
1065 - [You can now specify a function to handle a panic in the Rust runtime with the
1066 `#[panic_handler]` attribute.][51366]
1070 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
1071 - [Added the `aarch64-unknown-netbsd` target][53165]
1075 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
1079 - [`Ipv4Addr::BROADCAST`]
1080 - [`Ipv4Addr::LOCALHOST`]
1081 - [`Ipv4Addr::UNSPECIFIED`]
1082 - [`Ipv6Addr::LOCALHOST`]
1083 - [`Ipv6Addr::UNSPECIFIED`]
1084 - [`Iterator::find_map`]
1086 The following methods are replacement methods for `trim_left`, `trim_right`,
1087 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
1089 - [`str::trim_end_matches`]
1091 - [`str::trim_start_matches`]
1092 - [`str::trim_start`]
1096 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
1097 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
1098 equivalent to calling `rustdoc --error-format=json`.
1099 - [Cargo will now provide a progress bar for builds.][cargo/5995]
1103 - [`rustdoc` allows you to specify what edition to treat your code as with the
1104 `--edition` option.][54057]
1105 - [`rustdoc` now has the `--color` (specify whether to output color) and
1106 `--error-format` (specify error format, e.g. `json`) options.][53003]
1107 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
1108 debug symbols.][53774]
1109 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
1110 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
1112 [50911]: https://github.com/rust-lang/rust/pull/50911/
1113 [51363]: https://github.com/rust-lang/rust/pull/51363/
1114 [51366]: https://github.com/rust-lang/rust/pull/51366/
1115 [52081]: https://github.com/rust-lang/rust/pull/52081/
1116 [53003]: https://github.com/rust-lang/rust/pull/53003/
1117 [53033]: https://github.com/rust-lang/rust/pull/53033/
1118 [53044]: https://github.com/rust-lang/rust/pull/53044/
1119 [53165]: https://github.com/rust-lang/rust/pull/53165/
1120 [53213]: https://github.com/rust-lang/rust/pull/53213/
1121 [53236]: https://github.com/rust-lang/rust/pull/53236/
1122 [53272]: https://github.com/rust-lang/rust/pull/53272/
1123 [53370]: https://github.com/rust-lang/rust/pull/53370/
1124 [53459]: https://github.com/rust-lang/rust/pull/53459/
1125 [53774]: https://github.com/rust-lang/rust/pull/53774/
1126 [53822]: https://github.com/rust-lang/rust/pull/53822/
1127 [54057]: https://github.com/rust-lang/rust/pull/54057/
1128 [54146]: https://github.com/rust-lang/rust/pull/54146/
1129 [54404]: https://github.com/rust-lang/rust/pull/54404/
1130 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
1131 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
1132 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
1133 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
1135 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
1136 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
1137 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
1138 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
1139 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
1140 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
1141 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
1142 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
1143 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
1144 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
1147 Version 1.29.2 (2018-10-11)
1148 ===========================
1150 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
1151 - The `rls-preview` component on the windows-gnu targets has been restored.
1153 [54639]: https://github.com/rust-lang/rust/pull/54639
1156 Version 1.29.1 (2018-09-25)
1157 ===========================
1162 - The standard library's `str::repeat` function contained an out of bounds write
1163 caused by an integer overflow. This has been fixed by deterministically
1164 panicking when an overflow happens.
1166 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
1170 Version 1.29.0 (2018-09-13)
1171 ==========================
1175 - [Bumped minimum LLVM version to 5.0.][51899]
1176 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
1177 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
1181 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
1182 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
1183 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
1184 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
1186 - [`Cell<T>` now allows `T` to be unsized.][50494]
1187 - [`SocketAddr` is now stable on Redox.][52656]
1192 - [`Iterator::flatten`]
1197 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
1198 `--locked` to disable this behavior.
1199 - [`cargo-install` will now allow you to cross compile an install
1200 using `--target`.][cargo/5614]
1201 - [Added the `cargo-fix` subcommand to automatically move project code from
1202 2015 edition to 2018.][cargo/5723]
1203 - [`cargo doc` can now optionally document private types using the
1204 `--document-private-items` flag.][cargo/5543]
1208 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
1209 the specified level to that level.][52354] For example `--cap-lints warn`
1210 will demote `deny` and `forbid` lints to `warn`.
1211 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
1212 fails and `101` if there is a panic.][52197]
1213 - [A preview of clippy has been made available through rustup.][51122]
1214 You can install the preview with `rustup component add clippy-preview`.
1218 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
1219 Use `str::get_unchecked(begin..end)` instead.
1220 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
1221 Consider using the `home_dir` function from
1222 https://crates.io/crates/dirs instead.
1223 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
1224 - [`cfg` attributes and `--cfg` command line flags are now more
1225 strictly validated.][53893]
1227 [53893]: https://github.com/rust-lang/rust/pull/53893/
1228 [52861]: https://github.com/rust-lang/rust/pull/52861/
1229 [52656]: https://github.com/rust-lang/rust/pull/52656/
1230 [52239]: https://github.com/rust-lang/rust/pull/52239/
1231 [52330]: https://github.com/rust-lang/rust/pull/52330/
1232 [52354]: https://github.com/rust-lang/rust/pull/52354/
1233 [52402]: https://github.com/rust-lang/rust/pull/52402/
1234 [52103]: https://github.com/rust-lang/rust/pull/52103/
1235 [52197]: https://github.com/rust-lang/rust/pull/52197/
1236 [51807]: https://github.com/rust-lang/rust/pull/51807/
1237 [51899]: https://github.com/rust-lang/rust/pull/51899/
1238 [51912]: https://github.com/rust-lang/rust/pull/51912/
1239 [51511]: https://github.com/rust-lang/rust/pull/51511/
1240 [51619]: https://github.com/rust-lang/rust/pull/51619/
1241 [51656]: https://github.com/rust-lang/rust/pull/51656/
1242 [51178]: https://github.com/rust-lang/rust/pull/51178/
1243 [51122]: https://github.com/rust-lang/rust/pull/51122
1244 [50494]: https://github.com/rust-lang/rust/pull/50494/
1245 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
1246 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
1247 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
1248 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
1249 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
1250 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
1251 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
1254 Version 1.28.0 (2018-08-02)
1255 ===========================
1259 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
1260 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
1261 the inner type across Foreign Function Interface (FFI) boundaries.
1262 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
1263 and can now be used as identifiers.][51196]
1264 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
1265 stable.][51241] This will allow users to specify a global allocator for
1267 - [Unit test functions marked with the `#[test]` attribute can now return
1268 `Result<(), E: Debug>` in addition to `()`.][51298]
1269 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
1270 allows macros to easily target lifetimes.
1274 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
1275 prioritise making smaller binary sizes. `z` is the same as `s` with the
1276 exception that it does not vectorise loops, which typically results in an even
1278 - [The short error format is now stable.][49546] Specified with
1279 `--error-format=short` this option will provide a more compressed output of
1280 rust error messages.
1281 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
1282 - [Reduced the number of allocations in the macro parser.][50855] This can
1283 improve compile times of macro heavy crates on average by 5%.
1287 - [Implemented `Default` for `&mut str`.][51306]
1288 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
1289 - [Implemented `Extend` for `()`.][50234]
1290 - [The `Debug` implementation of `time::Duration` should now be more easily
1291 human readable.][50364] Previously a `Duration` of one second would printed as
1292 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
1293 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
1294 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
1295 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
1296 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
1297 for `PathBuf`.][50170]
1298 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
1299 and `Wrapping<i128>`.][50465]
1300 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
1301 possible.][51050] This can provide up to a 40% speed increase.
1302 - [Improved error messages when using `format!`.][50610]
1306 - [`Iterator::step_by`]
1307 - [`Path::ancestors`]
1308 - [`SystemTime::UNIX_EPOCH`]
1309 - [`alloc::GlobalAlloc`]
1311 - [`alloc::LayoutErr`]
1314 - [`alloc::alloc_zeroed`]
1315 - [`alloc::dealloc`]
1316 - [`alloc::realloc`]
1317 - [`alloc::handle_alloc_error`]
1318 - [`btree_map::Entry::or_default`]
1319 - [`fmt::Alignment`]
1320 - [`hash_map::Entry::or_default`]
1321 - [`iter::repeat_with`]
1322 - [`num::NonZeroUsize`]
1323 - [`num::NonZeroU128`]
1324 - [`num::NonZeroU16`]
1325 - [`num::NonZeroU32`]
1326 - [`num::NonZeroU64`]
1327 - [`num::NonZeroU8`]
1328 - [`ops::RangeBounds`]
1329 - [`slice::SliceIndex`]
1330 - [`slice::from_mut`]
1331 - [`slice::from_ref`]
1332 - [`{Any + Send + Sync}::downcast_mut`]
1333 - [`{Any + Send + Sync}::downcast_ref`]
1334 - [`{Any + Send + Sync}::is`]
1338 - [Cargo will now no longer allow you to publish crates with build scripts that
1339 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
1340 considered to be immutable.
1344 - [The `suggestion_applicability` field in `rustc`'s json output is now
1345 stable.][50486] This will allow dev tools to check whether a code suggestion
1346 would apply to them.
1350 - [Rust will consider trait objects with duplicated constraints to be the same
1351 type as without the duplicated constraint.][51276] For example the below code will
1352 now fail to compile.
1357 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
1360 impl Trait + Send + Send {
1361 fn test(&self) { println!("two"); }
1365 [49546]: https://github.com/rust-lang/rust/pull/49546/
1366 [50143]: https://github.com/rust-lang/rust/pull/50143/
1367 [50170]: https://github.com/rust-lang/rust/pull/50170/
1368 [50234]: https://github.com/rust-lang/rust/pull/50234/
1369 [50265]: https://github.com/rust-lang/rust/pull/50265/
1370 [50364]: https://github.com/rust-lang/rust/pull/50364/
1371 [50385]: https://github.com/rust-lang/rust/pull/50385/
1372 [50465]: https://github.com/rust-lang/rust/pull/50465/
1373 [50486]: https://github.com/rust-lang/rust/pull/50486/
1374 [50554]: https://github.com/rust-lang/rust/pull/50554/
1375 [50610]: https://github.com/rust-lang/rust/pull/50610/
1376 [50855]: https://github.com/rust-lang/rust/pull/50855/
1377 [51050]: https://github.com/rust-lang/rust/pull/51050/
1378 [51196]: https://github.com/rust-lang/rust/pull/51196/
1379 [51200]: https://github.com/rust-lang/rust/pull/51200/
1380 [51241]: https://github.com/rust-lang/rust/pull/51241/
1381 [51276]: https://github.com/rust-lang/rust/pull/51276/
1382 [51298]: https://github.com/rust-lang/rust/pull/51298/
1383 [51306]: https://github.com/rust-lang/rust/pull/51306/
1384 [51562]: https://github.com/rust-lang/rust/pull/51562/
1385 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
1386 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
1387 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
1388 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
1389 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
1390 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
1391 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
1392 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
1393 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
1394 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
1395 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
1396 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
1397 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
1398 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
1399 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
1400 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
1401 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
1402 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
1403 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
1404 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
1405 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
1406 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
1407 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
1408 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
1409 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
1410 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
1411 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
1412 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
1413 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
1414 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
1416 Version 1.27.2 (2018-07-20)
1417 ===========================
1422 - The borrow checker was fixed to avoid potential unsoundness when using
1423 match ergonomics: [#52213][52213].
1425 [52213]: https://github.com/rust-lang/rust/issues/52213
1427 Version 1.27.1 (2018-07-10)
1428 ===========================
1433 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
1434 when running, which enabled executing code as some other user on a
1435 given machine. This release fixes that vulnerability; you can read
1436 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
1438 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
1443 - The borrow checker was fixed to avoid an additional potential unsoundness when using
1444 match ergonomics: [#51415][51415], [#49534][49534].
1446 [51415]: https://github.com/rust-lang/rust/issues/51415
1447 [49534]: https://github.com/rust-lang/rust/issues/49534
1448 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
1449 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
1451 Version 1.27.0 (2018-06-21)
1452 ==========================
1456 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
1457 be used as an identifier.
1458 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
1459 bare `Trait` syntax, and should make it clearer when being used in tandem with
1460 `impl Trait` because it is equivalent to the following syntax:
1461 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
1462 `Box<Trait> == Box<dyn Trait>`.
1463 - [Attributes on generic parameters such as types and lifetimes are
1464 now stable.][48851] e.g.
1465 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
1466 - [The `#[must_use]` attribute can now also be used on functions as well as
1467 types.][48925] It provides a lint that by default warns users when the
1468 value returned by a function has not been used.
1472 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
1476 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
1477 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
1478 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
1479 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
1480 the `cfg` attribute.
1481 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
1482 std are now available in core.][49896]
1483 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
1485 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
1486 that the operation isn't done in place.
1487 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
1488 the `#[must_use]` attribute][49533] to warn about unused potentially
1489 expensive allocations.
1493 - [`DoubleEndedIterator::rfind`]
1494 - [`DoubleEndedIterator::rfold`]
1495 - [`DoubleEndedIterator::try_rfold`]
1496 - [`Duration::from_micros`]
1497 - [`Duration::from_nanos`]
1498 - [`Duration::subsec_micros`]
1499 - [`Duration::subsec_millis`]
1500 - [`HashMap::remove_entry`]
1501 - [`Iterator::try_fold`]
1502 - [`Iterator::try_for_each`]
1504 - [`Option::filter`]
1505 - [`String::replace_range`]
1506 - [`Take::set_limit`]
1507 - [`hint::unreachable_unchecked`]
1508 - [`os::unix::process::parent_id`]
1509 - [`ptr::swap_nonoverlapping`]
1510 - [`slice::rsplit_mut`]
1512 - [`slice::swap_with_slice`]
1516 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
1517 `readme`, and `repository` fields.][cargo/5386]
1518 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
1519 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
1520 a different directory than `target` for placing compilation artifacts.
1521 - [Cargo will be adding automatic target inference for binaries, benchmarks,
1522 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
1523 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
1524 where cargo would infer a binary, Cargo will produce a warning. You can
1525 disable this feature ahead of time by setting any of the following to false:
1526 `autobins`, `autobenches`, `autoexamples`, `autotests`.
1527 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
1528 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
1532 - [Added “The Rustc book” into the official documentation.][49707]
1533 [“The Rustc book”] documents and teaches how to use the rustc compiler.
1534 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
1538 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
1539 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
1540 compile, `"".is_empty()` will still compile.
1541 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
1542 will only print the inner type.][48553] E.g.
1543 `print!("{:?}", AtomicBool::new(true))` will print `true`,
1544 not `AtomicBool(true)`.
1545 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
1546 could enter higher numbers but they were not supported by LLVM. Up to 512MB
1547 alignment should cover all use cases.
1548 - The `.description()` method on the `std::error::Error` trait
1549 [has been soft-deprecated][50163]. It is no longer required to implement it.
1551 [48553]: https://github.com/rust-lang/rust/pull/48553/
1552 [48851]: https://github.com/rust-lang/rust/pull/48851/
1553 [48925]: https://github.com/rust-lang/rust/pull/48925/
1554 [49533]: https://github.com/rust-lang/rust/pull/49533/
1555 [49623]: https://github.com/rust-lang/rust/pull/49623/
1556 [49630]: https://github.com/rust-lang/rust/pull/49630/
1557 [49664]: https://github.com/rust-lang/rust/pull/49664/
1558 [49699]: https://github.com/rust-lang/rust/pull/49699/
1559 [49707]: https://github.com/rust-lang/rust/pull/49707/
1560 [49719]: https://github.com/rust-lang/rust/pull/49719/
1561 [49896]: https://github.com/rust-lang/rust/pull/49896/
1562 [49968]: https://github.com/rust-lang/rust/pull/49968/
1563 [50163]: https://github.com/rust-lang/rust/pull/50163
1564 [50177]: https://github.com/rust-lang/rust/pull/50177/
1565 [50378]: https://github.com/rust-lang/rust/pull/50378/
1566 [50398]: https://github.com/rust-lang/rust/pull/50398/
1567 [50423]: https://github.com/rust-lang/rust/pull/50423/
1568 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
1569 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
1570 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
1571 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
1572 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
1573 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
1574 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
1575 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
1576 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
1577 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
1578 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
1579 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1580 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1581 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
1582 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
1583 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
1584 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
1585 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
1586 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
1587 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
1588 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
1589 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
1590 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1591 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
1592 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
1593 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
1594 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
1595 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
1596 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
1597 [“The Rustc book”]: https://doc.rust-lang.org/rustc
1600 Version 1.26.2 (2018-06-05)
1601 ==========================
1606 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
1608 [51117]: https://github.com/rust-lang/rust/issues/51117
1611 Version 1.26.1 (2018-05-29)
1612 ==========================
1617 - [RLS now works on Windows.][50646]
1618 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
1624 - [`fn main() -> impl Trait` no longer works for non-Termination
1626 This reverts an accidental stabilization.
1627 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
1628 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
1630 [50646]: https://github.com/rust-lang/rust/issues/50646
1631 [50656]: https://github.com/rust-lang/rust/pull/50656
1632 [50812]: https://github.com/rust-lang/rust/pull/50812
1633 [50950]: https://github.com/rust-lang/rust/issues/50950
1634 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
1636 Version 1.26.0 (2018-05-10)
1637 ==========================
1641 - [Closures now implement `Copy` and/or `Clone` if all captured variables
1642 implement either or both traits.][49299]
1643 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
1644 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
1645 lifetime can be elided.][49458]
1646 - [`impl Trait` is now stable allowing you to have abstract types in returns
1647 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
1648 `fn open(path: impl AsRef<Path>)`.
1649 - [Pattern matching will now automatically apply dereferences.][49394]
1650 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
1651 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
1652 - [A lot of operations are now available in a const context.][46882] E.g. You
1653 can now index into constant arrays, reference and dereference into constants,
1654 and use tuple struct constructors.
1655 - [Fixed entry slice patterns are now stable.][48516] E.g.
1657 let points = [1, 2, 3, 4];
1659 [1, 2, 3, 4] => println!("All points were sequential."),
1660 _ => println!("Not all points were sequential."),
1667 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
1668 - [Fixed exponential projection complexity on nested types.][48296]
1669 This can provide up to a ~12% reduction in compile times for certain crates.
1670 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
1671 to remap path prefixes outputted by the compiler.
1672 - [Added `powerpc-unknown-netbsd` target.][48281]
1676 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1677 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1678 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1679 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1680 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1681 - [`ascii::escape_default` is now available in libcore.][48735]
1682 - [Trailing commas are now supported in std and core macros.][48056]
1683 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1684 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1689 - [`*const T::copy_to_nonoverlapping`]
1690 - [`*const T::copy_to`]
1691 - [`*const T::read_unaligned`]
1692 - [`*const T::read_volatile`]
1693 - [`*const T::read`]
1695 - [`*const T::wrapping_add`]
1696 - [`*const T::wrapping_sub`]
1698 - [`*mut T::copy_to_nonoverlapping`]
1699 - [`*mut T::copy_to`]
1700 - [`*mut T::read_unaligned`]
1701 - [`*mut T::read_volatile`]
1703 - [`*mut T::replace`]
1706 - [`*mut T::wrapping_add`]
1707 - [`*mut T::wrapping_sub`]
1708 - [`*mut T::write_bytes`]
1709 - [`*mut T::write_unaligned`]
1710 - [`*mut T::write_volatile`]
1713 - [`FromUtf8Error::as_bytes`]
1714 - [`LocalKey::try_with`]
1715 - [`Option::cloned`]
1716 - [`btree_map::Entry::and_modify`]
1717 - [`fs::read_to_string`]
1720 - [`hash_map::Entry::and_modify`]
1721 - [`iter::FusedIterator`]
1722 - [`ops::RangeInclusive`]
1723 - [`ops::RangeToInclusive`]
1725 - [`slice::rotate_left`]
1726 - [`slice::rotate_right`]
1727 - [`String::retain`]
1732 - [Cargo will now output path to custom commands when `-v` is
1733 passed with `--list`][cargo/5041]
1734 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1738 - [The second edition of "The Rust Programming Language" book is now recommended
1739 over the first.][48404]
1744 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1745 syntax is now invalid.
1747 use std::ops::Fn as dyn;
1748 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1750 - [The result of dereferences are no longer promoted to `'static`.][47408]
1754 const PAIR: &(i32, i32) = &(0, 1);
1755 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1758 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1759 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1761 - [Removed hoedown from rustdoc.][48274]
1762 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1764 [46882]: https://github.com/rust-lang/rust/pull/46882
1765 [47379]: https://github.com/rust-lang/rust/pull/47379
1766 [47408]: https://github.com/rust-lang/rust/pull/47408
1767 [47813]: https://github.com/rust-lang/rust/pull/47813
1768 [48056]: https://github.com/rust-lang/rust/pull/48056
1769 [48125]: https://github.com/rust-lang/rust/pull/48125
1770 [48166]: https://github.com/rust-lang/rust/pull/48166
1771 [48235]: https://github.com/rust-lang/rust/pull/48235
1772 [48274]: https://github.com/rust-lang/rust/pull/48274
1773 [48281]: https://github.com/rust-lang/rust/pull/48281
1774 [48296]: https://github.com/rust-lang/rust/pull/48296
1775 [48326]: https://github.com/rust-lang/rust/pull/48326
1776 [48359]: https://github.com/rust-lang/rust/pull/48359
1777 [48404]: https://github.com/rust-lang/rust/pull/48404
1778 [48481]: https://github.com/rust-lang/rust/pull/48481
1779 [48516]: https://github.com/rust-lang/rust/pull/48516
1780 [48628]: https://github.com/rust-lang/rust/pull/48628
1781 [48629]: https://github.com/rust-lang/rust/pull/48629
1782 [48657]: https://github.com/rust-lang/rust/pull/48657
1783 [48735]: https://github.com/rust-lang/rust/pull/48735
1784 [48978]: https://github.com/rust-lang/rust/pull/48978
1785 [49101]: https://github.com/rust-lang/rust/pull/49101
1786 [49109]: https://github.com/rust-lang/rust/pull/49109
1787 [49121]: https://github.com/rust-lang/rust/pull/49121
1788 [49162]: https://github.com/rust-lang/rust/pull/49162
1789 [49184]: https://github.com/rust-lang/rust/pull/49184
1790 [49234]: https://github.com/rust-lang/rust/pull/49234
1791 [49255]: https://github.com/rust-lang/rust/pull/49255
1792 [49299]: https://github.com/rust-lang/rust/pull/49299
1793 [49305]: https://github.com/rust-lang/rust/pull/49305
1794 [49394]: https://github.com/rust-lang/rust/pull/49394
1795 [49458]: https://github.com/rust-lang/rust/pull/49458
1796 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
1797 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
1798 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
1799 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
1800 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
1801 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
1802 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
1803 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
1804 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
1805 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
1806 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
1807 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
1808 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
1809 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
1810 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
1811 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
1812 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
1813 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
1814 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
1815 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
1816 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
1817 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
1818 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
1819 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
1820 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
1821 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
1822 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
1823 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
1824 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
1825 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
1826 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
1827 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
1828 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
1829 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
1830 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
1831 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
1832 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1833 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
1834 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
1835 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
1836 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
1837 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
1840 Version 1.25.0 (2018-03-29)
1841 ==========================
1845 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
1846 - [You can now use nested groups of imports.][47948]
1847 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
1848 - [You can now have `|` at the start of a match arm.][47947] e.g.
1850 enum Foo { A, B, C }
1856 | Foo::B => println!("AB"),
1857 | Foo::C => println!("C"),
1864 - [Upgraded to LLVM 6.][47828]
1865 - [Added `-C lto=val` option.][47521]
1866 - [Added `i586-unknown-linux-musl` target][47282]
1870 - [Impl Send for `process::Command` on Unix.][47760]
1871 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
1872 - [`UnsafeCell::into_inner` is now safe.][47204]
1873 - [Implement libstd for CloudABI.][47268]
1874 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
1875 - [Implement `AsRef<Path>` for Component][46985]
1876 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
1877 - [Moved `Duration` to libcore.][46666]
1881 - [`Location::column`]
1884 The following functions can now be used in a constant expression.
1885 eg. `static MINUTE: Duration = Duration::from_secs(60);`
1886 - [`Duration::new`][47300]
1887 - [`Duration::from_secs`][47300]
1888 - [`Duration::from_millis`][47300]
1892 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
1893 - [`cargo new` now defaults to creating a binary crate, instead of a
1894 library crate.][cargo/5029]
1898 - [Rust by example is now shipped with new releases][46196]
1902 - [Deprecated `net::lookup_host`.][47510]
1903 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
1904 - The borrow checker was sometimes incorrectly permitting overlapping borrows
1905 around indexing operations (see [#47349][47349]). This has been fixed (which also
1906 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
1907 - [Removed deprecated unstable attribute `#[simd]`.][47251]
1909 [33903]: https://github.com/rust-lang/rust/pull/33903
1910 [47947]: https://github.com/rust-lang/rust/pull/47947
1911 [47948]: https://github.com/rust-lang/rust/pull/47948
1912 [47760]: https://github.com/rust-lang/rust/pull/47760
1913 [47790]: https://github.com/rust-lang/rust/pull/47790
1914 [47828]: https://github.com/rust-lang/rust/pull/47828
1915 [47398]: https://github.com/rust-lang/rust/pull/47398
1916 [47510]: https://github.com/rust-lang/rust/pull/47510
1917 [47521]: https://github.com/rust-lang/rust/pull/47521
1918 [47204]: https://github.com/rust-lang/rust/pull/47204
1919 [47251]: https://github.com/rust-lang/rust/pull/47251
1920 [47268]: https://github.com/rust-lang/rust/pull/47268
1921 [47282]: https://github.com/rust-lang/rust/pull/47282
1922 [47300]: https://github.com/rust-lang/rust/pull/47300
1923 [47349]: https://github.com/rust-lang/rust/pull/47349
1924 [46931]: https://github.com/rust-lang/rust/pull/46931
1925 [46985]: https://github.com/rust-lang/rust/pull/46985
1926 [47006]: https://github.com/rust-lang/rust/pull/47006
1927 [46830]: https://github.com/rust-lang/rust/pull/46830
1928 [46095]: https://github.com/rust-lang/rust/pull/46095
1929 [46666]: https://github.com/rust-lang/rust/pull/46666
1930 [46196]: https://github.com/rust-lang/rust/pull/46196
1931 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
1932 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
1933 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
1934 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
1935 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
1938 Version 1.24.1 (2018-03-01)
1939 ==========================
1941 - [Do not abort when unwinding through FFI][48251]
1942 - [Emit UTF-16 files for linker arguments on Windows][48318]
1943 - [Make the error index generator work again][48308]
1944 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
1946 [48251]: https://github.com/rust-lang/rust/issues/48251
1947 [48308]: https://github.com/rust-lang/rust/issues/48308
1948 [48318]: https://github.com/rust-lang/rust/issues/48318
1949 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
1952 Version 1.24.0 (2018-02-15)
1953 ==========================
1957 - [External `sysv64` ffi is now available.][46528]
1958 eg. `extern "sysv64" fn foo () {}`
1962 - [rustc now uses 16 codegen units by default for release builds.][46910]
1963 For the fastest builds, utilize `codegen-units=1`.
1964 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
1965 - [Add `aarch64-unknown-openbsd` support][46760]
1969 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
1970 improvement in performance in the majority of cases.
1971 - [`OsStr`'s `Debug` implementation is now lossless and consistent
1972 with Windows.][46798]
1973 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
1974 - [impl `From<bool>` for `AtomicBool`][46293]
1975 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
1976 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
1977 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
1978 - [float::from_bits now just uses transmute.][46012] This provides
1979 some optimisations from LLVM.
1980 - [Copied `AsciiExt` methods onto `char`][46077]
1981 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
1982 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
1983 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
1984 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
1988 - [`RefCell::replace`]
1990 - [`atomic::spin_loop_hint`]
1992 The following functions can now be used in a constant expression.
1993 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
1995 - [`AtomicBool::new`][46287]
1996 - [`AtomicUsize::new`][46287]
1997 - [`AtomicIsize::new`][46287]
1998 - [`AtomicPtr::new`][46287]
1999 - [`Cell::new`][46287]
2000 - [`{integer}::min_value`][46287]
2001 - [`{integer}::max_value`][46287]
2002 - [`mem::size_of`][46287]
2003 - [`mem::align_of`][46287]
2004 - [`ptr::null`][46287]
2005 - [`ptr::null_mut`][46287]
2006 - [`RefCell::new`][46287]
2007 - [`UnsafeCell::new`][46287]
2011 - [Added a `workspace.default-members` config that
2012 overrides implied `--all` in virtual workspaces.][cargo/4743]
2013 - [Enable incremental by default on development builds.][cargo/4817] Also added
2014 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
2015 per-project or global basis respectively.
2022 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
2023 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
2024 in accordance with IETF RFC 4291 §2.2.
2025 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
2026 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
2027 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
2028 - [Leading zeros in tuple struct members is now an error][47084]
2029 - [`column!()` macro is one-based instead of zero-based][46977]
2030 - [`fmt::Arguments` can no longer be shared across threads][45198]
2031 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
2032 - [Cargo sets a different working directory for the compiler][cargo/4788]
2034 [44884]: https://github.com/rust-lang/rust/pull/44884
2035 [45198]: https://github.com/rust-lang/rust/pull/45198
2036 [45506]: https://github.com/rust-lang/rust/pull/45506
2037 [45904]: https://github.com/rust-lang/rust/pull/45904
2038 [45990]: https://github.com/rust-lang/rust/pull/45990
2039 [46012]: https://github.com/rust-lang/rust/pull/46012
2040 [46077]: https://github.com/rust-lang/rust/pull/46077
2041 [46094]: https://github.com/rust-lang/rust/pull/46094
2042 [46284]: https://github.com/rust-lang/rust/pull/46284
2043 [46287]: https://github.com/rust-lang/rust/pull/46287
2044 [46293]: https://github.com/rust-lang/rust/pull/46293
2045 [46528]: https://github.com/rust-lang/rust/pull/46528
2046 [46671]: https://github.com/rust-lang/rust/pull/46671
2047 [46713]: https://github.com/rust-lang/rust/pull/46713
2048 [46735]: https://github.com/rust-lang/rust/pull/46735
2049 [46749]: https://github.com/rust-lang/rust/pull/46749
2050 [46760]: https://github.com/rust-lang/rust/pull/46760
2051 [46798]: https://github.com/rust-lang/rust/pull/46798
2052 [46828]: https://github.com/rust-lang/rust/pull/46828
2053 [46831]: https://github.com/rust-lang/rust/pull/46831
2054 [46833]: https://github.com/rust-lang/rust/pull/46833
2055 [46910]: https://github.com/rust-lang/rust/pull/46910
2056 [46977]: https://github.com/rust-lang/rust/pull/46977
2057 [47018]: https://github.com/rust-lang/rust/pull/47018
2058 [47080]: https://github.com/rust-lang/rust/pull/47080
2059 [47084]: https://github.com/rust-lang/rust/pull/47084
2060 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
2061 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
2062 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
2063 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
2064 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
2065 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
2068 Version 1.23.0 (2018-01-04)
2069 ==========================
2073 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
2074 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
2075 Which should fix some confusing errors in some operations.
2079 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
2080 undefined behavior.][45920]
2081 - [rustc now suggests renaming import if names clash.][45660]
2082 - [Display errors/warnings correctly when there are zero-width or
2083 wide characters.][45711]
2084 - [rustc now avoids unnecessary copies of arguments that are
2085 simple bindings][45380] This should improve memory usage on average by 5-10%.
2086 - [Updated musl used to build musl rustc to 1.1.17][45393]
2090 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
2091 - [Implement Hash for raw pointers to unsized types][45483]
2092 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
2093 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
2094 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
2095 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
2096 and `<*mut T>::as_mut`][44932]
2097 - [Optimized `Thread::{park, unpark}` implementation][45524]
2098 - [Improved `SliceExt::binary_search` performance.][45333]
2099 - [impl `FromIterator<()>` for `()`][45379]
2100 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
2108 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
2109 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
2110 - [Added unit test checking to `cargo check`][cargo/4592]
2111 - [Cargo now lets you install a specific version
2112 using `cargo install --version`][cargo/4637]
2116 - [Releases now ship with the Cargo book documentation.][45692]
2117 - [rustdoc now prints rendering warnings on every run.][45324]
2121 - [Changes have been made to type equality to make it more correct,
2122 in rare cases this could break some code.][45853] [Tracking issue for
2123 further information][45852]
2124 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
2125 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
2126 Android 9, the minimum supported version is Android 14.
2127 - [Bumped the minimum LLVM to 3.9][45326]
2129 [44042]: https://github.com/rust-lang/rust/pull/44042
2130 [44932]: https://github.com/rust-lang/rust/pull/44932
2131 [45267]: https://github.com/rust-lang/rust/pull/45267
2132 [45324]: https://github.com/rust-lang/rust/pull/45324
2133 [45326]: https://github.com/rust-lang/rust/pull/45326
2134 [45333]: https://github.com/rust-lang/rust/pull/45333
2135 [45379]: https://github.com/rust-lang/rust/pull/45379
2136 [45380]: https://github.com/rust-lang/rust/pull/45380
2137 [45393]: https://github.com/rust-lang/rust/pull/45393
2138 [45435]: https://github.com/rust-lang/rust/pull/45435
2139 [45483]: https://github.com/rust-lang/rust/pull/45483
2140 [45524]: https://github.com/rust-lang/rust/pull/45524
2141 [45571]: https://github.com/rust-lang/rust/pull/45571
2142 [45580]: https://github.com/rust-lang/rust/pull/45580
2143 [45610]: https://github.com/rust-lang/rust/pull/45610
2144 [45660]: https://github.com/rust-lang/rust/pull/45660
2145 [45692]: https://github.com/rust-lang/rust/pull/45692
2146 [45711]: https://github.com/rust-lang/rust/pull/45711
2147 [45772]: https://github.com/rust-lang/rust/pull/45772
2148 [45852]: https://github.com/rust-lang/rust/issues/45852
2149 [45853]: https://github.com/rust-lang/rust/pull/45853
2150 [45887]: https://github.com/rust-lang/rust/pull/45887
2151 [45920]: https://github.com/rust-lang/rust/pull/45920
2152 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
2153 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
2154 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
2157 Version 1.22.1 (2017-11-22)
2158 ==========================
2160 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
2162 [46183]: https://github.com/rust-lang/rust/pull/46183
2164 Version 1.22.0 (2017-11-22)
2165 ==========================
2169 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
2170 - [Now accepts underscores in unicode escapes][43716]
2171 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
2172 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
2176 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
2177 - [rustc will no longer inline in codegen units when compiling for debug][45075]
2178 This should decrease compile times for debug builds.
2179 - [strict memory alignment now enabled on ARMv6][45094]
2180 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
2184 - [Allow atomic operations up to 32 bits
2185 on `armv5te_unknown_linux_gnueabi`][44978]
2186 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
2187 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
2188 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
2189 - [Properly detect overflow in `Instant += Duration`.][44220]
2190 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
2191 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
2192 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
2199 - [Cargo will now build multi file examples in subdirectories of the `examples`
2200 folder that have a `main.rs` file.][cargo/4496]
2201 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
2202 the old format will continue to work and can be updated with `cargo update`.
2203 - [Now supports vendoring git repositories][cargo/3992]
2207 - [`libbacktrace` is now available on Apple platforms.][44251]
2208 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
2209 This now lets you specify that a given code example will fail to compile.
2213 - [The minimum Android version that rustc can build for has been bumped
2214 to `4.0` from `2.3`][45656]
2215 - [Allowing `T op= &T` for numeric types has broken some type
2216 inference cases][45480]
2219 [42526]: https://github.com/rust-lang/rust/pull/42526
2220 [43017]: https://github.com/rust-lang/rust/pull/43017
2221 [43716]: https://github.com/rust-lang/rust/pull/43716
2222 [43949]: https://github.com/rust-lang/rust/pull/43949
2223 [44015]: https://github.com/rust-lang/rust/pull/44015
2224 [44220]: https://github.com/rust-lang/rust/pull/44220
2225 [44251]: https://github.com/rust-lang/rust/pull/44251
2226 [44287]: https://github.com/rust-lang/rust/pull/44287
2227 [44303]: https://github.com/rust-lang/rust/pull/44303
2228 [44456]: https://github.com/rust-lang/rust/pull/44456
2229 [44466]: https://github.com/rust-lang/rust/pull/44466
2230 [44895]: https://github.com/rust-lang/rust/pull/44895
2231 [44966]: https://github.com/rust-lang/rust/pull/44966
2232 [44978]: https://github.com/rust-lang/rust/pull/44978
2233 [45041]: https://github.com/rust-lang/rust/pull/45041
2234 [45064]: https://github.com/rust-lang/rust/pull/45064
2235 [45075]: https://github.com/rust-lang/rust/pull/45075
2236 [45094]: https://github.com/rust-lang/rust/pull/45094
2237 [45095]: https://github.com/rust-lang/rust/pull/45095
2238 [45480]: https://github.com/rust-lang/rust/issues/45480
2239 [45656]: https://github.com/rust-lang/rust/pull/45656
2240 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
2241 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
2242 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
2249 Version 1.21.0 (2017-10-12)
2250 ==========================
2254 - [You can now use static references for literals.][43838]
2258 let x: &'static u32 = &0;
2261 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
2264 my_macro!(Vec<i32>::new); // Always worked
2265 my_macro!(Vec::<i32>::new); // Now works
2270 - [Upgraded jemalloc to 4.5.0][43911]
2271 - [Enabled unwinding panics on Redox][43917]
2272 - [Now runs LLVM in parallel during translation phase.][43506]
2273 This should reduce peak memory usage.
2277 - [Generate builtin impls for `Clone` for all arrays and tuples that
2278 are `T: Clone`][43690]
2279 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
2280 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
2281 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
2286 [`std::mem::discriminant`]
2290 - [You can now call `cargo install` with multiple package names][cargo/4216]
2291 - [Cargo commands inside a virtual workspace will now implicitly
2292 pass `--all`][cargo/4335]
2293 - [Added a `[patch]` section to `Cargo.toml` to handle
2294 prepublication dependencies][cargo/4123] [RFC 1969]
2295 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
2296 like patterns][cargo/4270]
2297 - [Added the `--all-targets` option][cargo/4400]
2298 - [Using required dependencies as a feature is now deprecated and emits
2299 a warning][cargo/4364]
2304 - [Cargo docs are moving][43916]
2305 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
2306 - [The rustdoc book is now available][43863]
2307 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
2308 - [Added a preview of RLS has been made available through rustup][44204]
2309 Install with `rustup component add rls-preview`
2310 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
2311 Previously only showed `std::os::unix`.
2315 - [Changes in method matching against higher-ranked types][43880] This may cause
2316 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
2317 - [rustc's JSON error output's byte position start at top of file.][42973]
2318 Was previously relative to the rustc's internal `CodeMap` struct which
2319 required the unstable library `libsyntax` to correctly use.
2320 - [`unused_results` lint no longer ignores booleans][43728]
2322 [42565]: https://github.com/rust-lang/rust/pull/42565
2323 [42973]: https://github.com/rust-lang/rust/pull/42973
2324 [43348]: https://github.com/rust-lang/rust/pull/43348
2325 [43459]: https://github.com/rust-lang/rust/pull/43459
2326 [43506]: https://github.com/rust-lang/rust/pull/43506
2327 [43540]: https://github.com/rust-lang/rust/pull/43540
2328 [43690]: https://github.com/rust-lang/rust/pull/43690
2329 [43728]: https://github.com/rust-lang/rust/pull/43728
2330 [43838]: https://github.com/rust-lang/rust/pull/43838
2331 [43863]: https://github.com/rust-lang/rust/pull/43863
2332 [43880]: https://github.com/rust-lang/rust/pull/43880
2333 [43911]: https://github.com/rust-lang/rust/pull/43911
2334 [43916]: https://github.com/rust-lang/rust/pull/43916
2335 [43917]: https://github.com/rust-lang/rust/pull/43917
2336 [44204]: https://github.com/rust-lang/rust/pull/44204
2337 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
2338 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
2339 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2340 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
2341 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
2342 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
2343 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
2344 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
2345 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
2347 Version 1.20.0 (2017-08-31)
2348 ===========================
2352 - [Associated constants are now stabilised.][42809]
2353 - [A lot of macro bugs are now fixed.][42913]
2358 - [Struct fields are now properly coerced to the expected field type.][42807]
2359 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
2360 `wasm32-experimental-emscripten` target.
2361 - [Changed some of the error messages to be more helpful.][42033]
2362 - [Add support for RELRO(RELocation Read-Only) for platforms that support
2364 - [rustc now reports the total number of errors on compilation failure][43015]
2365 previously this was only the number of errors in the pass that failed.
2366 - [Expansion in rustc has been sped up 29x.][42533]
2367 - [added `msp430-none-elf` target.][43099]
2368 - [rustc will now suggest one-argument enum variant to fix type mismatch when
2370 - [Fixes backtraces on Redox][43228]
2371 - [rustc now identifies different versions of same crate when absolute paths of
2372 different types match in an error message.][42826]
2378 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
2379 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
2381 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
2382 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
2383 - [Impl `Clone` for `DefaultHasher`.][42799]
2384 - [Impl `Sync` for `SyncSender`.][42397]
2385 - [Impl `FromStr` for `char`][42271]
2386 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
2388 - [allow messages in the `unimplemented!()` macro.][42155]
2389 ie. `unimplemented!("Waiting for 1.21 to be stable")`
2390 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
2391 - [Upgrade to Unicode 10.0.0][42999]
2392 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
2393 - [Skip the main thread's manual stack guard on Linux][43072]
2394 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
2395 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
2397 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
2402 - [`CStr::into_c_string`]
2403 - [`CString::as_c_str`]
2404 - [`CString::into_boxed_c_str`]
2405 - [`Chain::get_mut`]
2406 - [`Chain::get_ref`]
2407 - [`Chain::into_inner`]
2408 - [`Option::get_or_insert_with`]
2409 - [`Option::get_or_insert`]
2410 - [`OsStr::into_os_string`]
2411 - [`OsString::into_boxed_os_str`]
2414 - [`Utf8Error::error_len`]
2415 - [`char::EscapeDebug`]
2416 - [`char::escape_debug`]
2417 - [`compile_error!`]
2418 - [`f32::from_bits`]
2420 - [`f64::from_bits`]
2422 - [`mem::ManuallyDrop`]
2423 - [`slice::sort_unstable_by_key`]
2424 - [`slice::sort_unstable_by`]
2425 - [`slice::sort_unstable`]
2426 - [`str::from_boxed_utf8_unchecked`]
2427 - [`str::as_bytes_mut`]
2428 - [`str::as_bytes_mut`]
2429 - [`str::from_utf8_mut`]
2430 - [`str::from_utf8_unchecked_mut`]
2432 - [`str::get_unchecked_mut`]
2433 - [`str::get_unchecked`]
2435 - [`str::into_boxed_bytes`]
2440 - [Cargo API token location moved from `~/.cargo/config` to
2441 `~/.cargo/credentials`.][cargo/3978]
2442 - [Cargo will now build `main.rs` binaries that are in sub-directories of
2443 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
2444 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
2445 - [You can now specify version of a binary when installed through
2446 `cargo install` using `--vers`.][cargo/4229]
2447 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
2448 failure.][cargo/4248]
2449 - [Changed the convention around which file is the crate root.][cargo/4259]
2450 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
2451 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
2456 - [Functions with `'static` in their return types will now not be as usable as
2457 if they were using lifetime parameters instead.][42417]
2458 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
2459 takes the sign of NaN into account where previously didn't.][42430]
2461 [42033]: https://github.com/rust-lang/rust/pull/42033
2462 [42155]: https://github.com/rust-lang/rust/pull/42155
2463 [42271]: https://github.com/rust-lang/rust/pull/42271
2464 [42397]: https://github.com/rust-lang/rust/pull/42397
2465 [42417]: https://github.com/rust-lang/rust/pull/42417
2466 [42430]: https://github.com/rust-lang/rust/pull/42430
2467 [42431]: https://github.com/rust-lang/rust/pull/42431
2468 [42533]: https://github.com/rust-lang/rust/pull/42533
2469 [42571]: https://github.com/rust-lang/rust/pull/42571
2470 [42613]: https://github.com/rust-lang/rust/pull/42613
2471 [42799]: https://github.com/rust-lang/rust/pull/42799
2472 [42807]: https://github.com/rust-lang/rust/pull/42807
2473 [42809]: https://github.com/rust-lang/rust/pull/42809
2474 [42822]: https://github.com/rust-lang/rust/pull/42822
2475 [42826]: https://github.com/rust-lang/rust/pull/42826
2476 [42854]: https://github.com/rust-lang/rust/pull/42854
2477 [42913]: https://github.com/rust-lang/rust/pull/42913
2478 [42999]: https://github.com/rust-lang/rust/pull/42999
2479 [43011]: https://github.com/rust-lang/rust/pull/43011
2480 [43015]: https://github.com/rust-lang/rust/pull/43015
2481 [43072]: https://github.com/rust-lang/rust/pull/43072
2482 [43077]: https://github.com/rust-lang/rust/pull/43077
2483 [43097]: https://github.com/rust-lang/rust/pull/43097
2484 [43099]: https://github.com/rust-lang/rust/pull/43099
2485 [43170]: https://github.com/rust-lang/rust/pull/43170
2486 [43178]: https://github.com/rust-lang/rust/pull/43178
2487 [43185]: https://github.com/rust-lang/rust/pull/43185
2488 [43228]: https://github.com/rust-lang/rust/pull/43228
2489 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
2490 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
2491 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
2492 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
2493 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
2494 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2495 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
2496 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
2497 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
2498 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
2499 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
2500 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
2501 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
2502 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
2503 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
2504 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
2505 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
2506 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
2507 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
2508 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
2509 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
2510 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
2511 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
2512 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
2513 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
2514 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
2515 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
2516 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
2517 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
2518 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
2519 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
2520 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
2521 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
2522 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
2523 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
2524 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
2525 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
2526 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
2527 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
2530 Version 1.19.0 (2017-07-20)
2531 ===========================
2536 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
2537 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
2538 - [Macro recursion limit increased to 1024 from 64.][41676]
2539 - [Added lint for detecting unused macros.][41907]
2540 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
2541 For example: `let x = loop { break 7; };`
2542 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
2543 contain `Copy` types and cannot have a `Drop` implementation.
2544 Example: `union Foo { bar: u8, baz: usize }`
2545 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
2546 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
2551 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
2552 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
2553 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
2554 you should use `--target armv7-linux-androideabi`.
2555 - [Fixed ICE when removing a source file between compilation sessions.][41873]
2556 - [Minor optimisation of string operations.][42037]
2557 - [Compiler error message is now `aborting due to previous error(s)` instead of
2558 `aborting due to N previous errors`][42150] This was previously inaccurate and
2559 would only count certain kinds of errors.
2560 - [The compiler now supports Visual Studio 2017][42225]
2561 - [The compiler is now built against LLVM 4.0.1 by default][42948]
2562 - [Added a lot][42264] of [new error codes][42302]
2563 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
2564 libraries with C Run-time Libraries(CRT) to be statically linked.
2565 - [Fixed various ARM codegen bugs][42740]
2570 - [`String` now implements `FromIterator<Cow<'a, str>>` and
2571 `Extend<Cow<'a, str>>`][41449]
2572 - [`Vec` now implements `From<&mut [T]>`][41530]
2573 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
2574 - [`SplitWhitespace` now implements `Clone`][41659]
2575 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
2577 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
2578 macros, but for printing to stderr.
2583 - [`OsString::shrink_to_fit`]
2586 - [`thread::ThreadId`]
2591 - [Build scripts can now add environment variables to the environment
2592 the crate is being compiled in.
2593 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
2594 - [Subcommands now replace the current process rather than spawning a new
2595 child process][cargo/3970]
2596 - [Workspace members can now accept glob file patterns][cargo/3979]
2597 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
2598 the members in a given workspace.][cargo/3988]
2599 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
2600 - [Target directory path is now in the cargo metadata][cargo/4022]
2601 - [Cargo no longer checks out a local working directory for the
2602 crates.io index][cargo/4026] This should provide smaller file size for the
2603 registry, and improve cloning times, especially on Windows machines.
2604 - [Added an `--exclude` option for excluding certain packages when using the
2605 `--all` option][cargo/4031]
2606 - [Cargo will now automatically retry when receiving a 5xx error
2607 from crates.io][cargo/4032]
2608 - [The `--features` option now accepts multiple comma or space
2609 delimited values.][cargo/4084]
2610 - [Added support for custom target specific runners][cargo/3954]
2615 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
2617 - [Rust will now release XZ compressed packages][rust-installer/57]
2618 - [rustup will now prefer to download rust packages with
2619 XZ compression][rustup/1100] over GZip packages.
2620 - [Added the ability to escape `#` in rust documentation][41785] By adding
2621 additional `#`'s ie. `##` is now `#`
2626 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
2627 - [`-Z` flags are now no longer allowed to be used on the stable
2628 compiler.][41751] This has been a warning for a year previous to this.
2629 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
2630 longer works][42844]. Users should migrate to the built-in `check`
2631 command, which has been available since 1.16.
2632 - [Ending a float literal with `._` is now a hard error.
2633 Example: `42._` .][41946]
2634 - [Any use of a private `extern crate` outside of its module is now a
2635 hard error.][36886] This was previously a warning.
2636 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
2637 relative while the `::` prefix makes a path absolute, but was ignored and the
2638 path was relative regardless.
2639 - [Floating point constants in match patterns is now a hard error][36890]
2640 This was previously a warning.
2641 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
2642 match patterns is now a hard error][36891] This was previously a warning.
2643 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
2645 - [From the pound escape, lines consisting of multiple `#`s are
2647 - [It is an error to re-export private enum variants][42460]. This is
2648 known to break a number of crates that depend on an older version of
2650 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
2651 to use it to find the linker, and the build will fail where it did
2652 not previously][42607]
2654 [36886]: https://github.com/rust-lang/rust/issues/36886
2655 [36888]: https://github.com/rust-lang/rust/issues/36888
2656 [36890]: https://github.com/rust-lang/rust/issues/36890
2657 [36891]: https://github.com/rust-lang/rust/issues/36891
2658 [36892]: https://github.com/rust-lang/rust/issues/36892
2659 [37406]: https://github.com/rust-lang/rust/issues/37406
2660 [39983]: https://github.com/rust-lang/rust/pull/39983
2661 [41145]: https://github.com/rust-lang/rust/pull/41145
2662 [41192]: https://github.com/rust-lang/rust/pull/41192
2663 [41258]: https://github.com/rust-lang/rust/pull/41258
2664 [41370]: https://github.com/rust-lang/rust/pull/41370
2665 [41449]: https://github.com/rust-lang/rust/pull/41449
2666 [41530]: https://github.com/rust-lang/rust/pull/41530
2667 [41624]: https://github.com/rust-lang/rust/pull/41624
2668 [41656]: https://github.com/rust-lang/rust/pull/41656
2669 [41659]: https://github.com/rust-lang/rust/pull/41659
2670 [41676]: https://github.com/rust-lang/rust/pull/41676
2671 [41751]: https://github.com/rust-lang/rust/pull/41751
2672 [41764]: https://github.com/rust-lang/rust/pull/41764
2673 [41785]: https://github.com/rust-lang/rust/pull/41785
2674 [41873]: https://github.com/rust-lang/rust/pull/41873
2675 [41907]: https://github.com/rust-lang/rust/pull/41907
2676 [41946]: https://github.com/rust-lang/rust/pull/41946
2677 [42016]: https://github.com/rust-lang/rust/pull/42016
2678 [42037]: https://github.com/rust-lang/rust/pull/42037
2679 [42068]: https://github.com/rust-lang/rust/pull/42068
2680 [42150]: https://github.com/rust-lang/rust/pull/42150
2681 [42162]: https://github.com/rust-lang/rust/pull/42162
2682 [42225]: https://github.com/rust-lang/rust/pull/42225
2683 [42264]: https://github.com/rust-lang/rust/pull/42264
2684 [42302]: https://github.com/rust-lang/rust/pull/42302
2685 [42460]: https://github.com/rust-lang/rust/issues/42460
2686 [42607]: https://github.com/rust-lang/rust/issues/42607
2687 [42740]: https://github.com/rust-lang/rust/pull/42740
2688 [42844]: https://github.com/rust-lang/rust/issues/42844
2689 [42948]: https://github.com/rust-lang/rust/pull/42948
2690 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2691 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2692 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2693 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2694 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2695 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2696 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2697 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2698 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2699 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2700 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2701 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2702 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2703 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2704 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2705 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2706 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2707 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2708 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2709 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2710 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2711 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2714 Version 1.18.0 (2017-06-08)
2715 ===========================
2720 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2721 make the item visible to just that module tree. Also accepts the keyword
2722 `crate` to make something public to the whole crate but not users of the
2723 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2724 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2725 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2726 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2727 types like `Write + Send`, trailing `+` are now supported in trait objects,
2728 and better error reporting for trait objects starting with `?Sized`.
2729 - [0e+10 is now a valid floating point literal][40589]
2730 - [Now warns if you bind a lifetime parameter to 'static][40734]
2731 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2732 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2733 representation in some cases.][40377]
2738 - [rustc can now emit mir with `--emit mir`][39891]
2739 - [Improved LLVM IR for trivial functions][40367]
2740 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2741 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2742 opportunities found through profiling
2743 - [Improved backtrace formatting when panicking][38165]
2748 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2749 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2750 iteration or reallocation.
2751 - [Simplified HashMap Bucket interface][40561] provides performance
2752 improvements for iterating and cloning.
2753 - [Specialize Vec::from_elem to use calloc][40409]
2754 - [Fixed Race condition in fs::create_dir_all][39799]
2755 - [No longer caching stdio on Windows][40516]
2756 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2757 2.50%~ faster and in one case now 12.50% faster.
2758 - [Optimized `AtomicBool::fetch_nand`][41143]
2763 - [`Child::try_wait`]
2764 - [`HashMap::retain`]
2765 - [`HashSet::retain`]
2767 - [`TcpStream::peek`]
2768 - [`UdpSocket::peek`]
2769 - [`UdpSocket::peek_from`]
2774 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
2775 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
2776 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
2777 - [Added Android build support][cargo/3885]
2778 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
2779 of a certain type, for example `cargo build --bins` will build all
2781 - [Added support for haiku][cargo/3952]
2786 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
2787 - [Added rust-windbg script for better debugging on Windows][39983]
2788 - [Rust now uses the official cross compiler for NetBSD][40612]
2789 - [rustdoc now accepts `#` at the start of files][40828]
2790 - [Fixed jemalloc support for musl][41168]
2795 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
2796 always placed after the sign if it exists and before the digits. With the `#`
2797 flag the zeroes are placed after the prefix and before the digits.
2798 - [Due to the struct field optimisation][40377], using `transmute` on structs
2799 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
2800 always been undefined behavior, but is now more likely to break in practice.
2801 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
2802 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
2803 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
2804 - [Overlapping inherent `impl`s are now a hard error][40728]
2805 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
2806 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
2807 `out.asm` and `out.ll` instead of only one of the filetypes.
2808 - [ calling a function that returns `Self` will no longer work][41805] when
2809 the size of `Self` cannot be statically determined.
2810 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
2811 this has caused a few regressions namely:
2813 - Changed the link order of local static/dynamic libraries (respecting the
2814 order on given rather than having the compiler reorder).
2815 - Changed how MinGW is linked, native code linked to dynamic libraries
2816 may require manually linking to the gcc support library (for the native
2819 [38165]: https://github.com/rust-lang/rust/pull/38165
2820 [39799]: https://github.com/rust-lang/rust/pull/39799
2821 [39891]: https://github.com/rust-lang/rust/pull/39891
2822 [39983]: https://github.com/rust-lang/rust/pull/39983
2823 [40043]: https://github.com/rust-lang/rust/pull/40043
2824 [40241]: https://github.com/rust-lang/rust/pull/40241
2825 [40338]: https://github.com/rust-lang/rust/pull/40338
2826 [40367]: https://github.com/rust-lang/rust/pull/40367
2827 [40377]: https://github.com/rust-lang/rust/pull/40377
2828 [40409]: https://github.com/rust-lang/rust/pull/40409
2829 [40516]: https://github.com/rust-lang/rust/pull/40516
2830 [40556]: https://github.com/rust-lang/rust/pull/40556
2831 [40561]: https://github.com/rust-lang/rust/pull/40561
2832 [40589]: https://github.com/rust-lang/rust/pull/40589
2833 [40612]: https://github.com/rust-lang/rust/pull/40612
2834 [40723]: https://github.com/rust-lang/rust/pull/40723
2835 [40728]: https://github.com/rust-lang/rust/pull/40728
2836 [40731]: https://github.com/rust-lang/rust/pull/40731
2837 [40734]: https://github.com/rust-lang/rust/pull/40734
2838 [40805]: https://github.com/rust-lang/rust/pull/40805
2839 [40807]: https://github.com/rust-lang/rust/pull/40807
2840 [40828]: https://github.com/rust-lang/rust/pull/40828
2841 [40870]: https://github.com/rust-lang/rust/pull/40870
2842 [41085]: https://github.com/rust-lang/rust/pull/41085
2843 [41143]: https://github.com/rust-lang/rust/pull/41143
2844 [41168]: https://github.com/rust-lang/rust/pull/41168
2845 [41270]: https://github.com/rust-lang/rust/issues/41270
2846 [41469]: https://github.com/rust-lang/rust/pull/41469
2847 [41805]: https://github.com/rust-lang/rust/issues/41805
2848 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
2849 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
2850 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
2851 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
2852 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
2853 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
2854 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
2855 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
2856 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
2857 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
2858 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
2859 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
2860 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
2861 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
2864 Version 1.17.0 (2017-04-27)
2865 ===========================
2870 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
2871 * [Fields of structs may be initialized without duplicating the field/variable
2872 names][39761]. [RFC 1682]
2873 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
2874 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2875 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
2876 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
2877 `'b`. Soundness fix.
2878 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
2879 * [Static variables may contain references to other statics][40027]
2884 * [Exit quickly on only `--emit dep-info`][40336]
2885 * [Make `-C relocation-model` more correctly determine whether the linker
2886 creates a position-independent executable][40245]
2887 * [Add `-C overflow-checks` to directly control whether integer overflow
2889 * [The rustc type checker now checks items on demand instead of in a single
2890 in-order pass][40008]. This is mostly an internal refactoring in support of
2891 future work, including incremental type checking, but also resolves [RFC
2892 1647], allowing `Self` to appear in `impl` `where` clauses.
2893 * [Optimize vtable loads][39995]
2894 * [Turn off vectorization for Emscripten targets][39990]
2895 * [Provide suggestions for unknown macros imported with `use`][39953]
2896 * [Fix ICEs in path resolution][39939]
2897 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
2898 * [Add clearer error message using `&str + &str`][39116]
2909 * [`Ordering::then`]
2910 * [`Ordering::then_with`]
2911 * [`BTreeMap::range`]
2912 * [`BTreeMap::range_mut`]
2913 * [`collections::Bound`]
2914 * [`process::abort`]
2915 * [`ptr::read_unaligned`]
2916 * [`ptr::write_unaligned`]
2917 * [`Result::expect_err`]
2920 * [`Cell::into_inner`]
2926 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
2927 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
2928 * [`String` implements `FromIterator<&char>`][40028]
2929 * `Box` [implements][40009] a number of new conversions:
2930 `From<Box<str>> for String`,
2931 `From<Box<[T]>> for Vec<T>`,
2932 `From<Box<CStr>> for CString`,
2933 `From<Box<OsStr>> for OsString`,
2934 `From<Box<Path>> for PathBuf`,
2935 `Into<Box<str>> for String`,
2936 `Into<Box<[T]>> for Vec<T>`,
2937 `Into<Box<CStr>> for CString`,
2938 `Into<Box<OsStr>> for OsString`,
2939 `Into<Box<Path>> for PathBuf`,
2940 `Default for Box<str>`,
2941 `Default for Box<CStr>`,
2942 `Default for Box<OsStr>`,
2943 `From<&CStr> for Box<CStr>`,
2944 `From<&OsStr> for Box<OsStr>`,
2945 `From<&Path> for Box<Path>`
2946 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
2947 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
2948 * [Slightly optimize `slice::sort`][39538]
2949 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
2950 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
2951 `Box<str>` implements `From<&str>`][39438]
2952 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
2953 `From<(I, u16)> where I: Into<IpAddr>`][39372]
2954 * [`format!` estimates the needed capacity before writing a string][39356]
2955 * [Support unprivileged symlink creation in Windows][38921]
2956 * [`PathBuf` implements `Default`][38764]
2957 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
2958 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
2959 and poor hash functions.
2964 * [Add `cargo check --all`][cargo/3731]
2965 * [Add an option to ignore SSL revocation checking][cargo/3699]
2966 * [Add `cargo run --package`][cargo/3691]
2967 * [Add `required_features`][cargo/3667]
2968 * [Assume `build.rs` is a build script][cargo/3664]
2969 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
2974 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
2976 * [The "Unstable Book" documents nightly-only features][ubook]
2977 * [Improve the style of the sidebar in rustdoc output][40265]
2978 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
2979 * [Fix MSP430 breakage due to `i128`][40257]
2980 * [Preliminary Solaris/SPARCv9 support][39903]
2981 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
2982 run without installing the MSVC runtime.
2983 * [`rustdoc --test` includes file names in test names][39788]
2984 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
2985 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
2986 * [Initial support for `aarch64-unknown-freebsd`][39491]
2987 * [Initial support for `i686-unknown-netbsd`][39426]
2988 * [This release no longer includes the old makefile build system][39431]. Rust
2989 is built with a custom build system, written in Rust, and with Cargo.
2990 * [Add Debug implementations for libcollection structs][39002]
2991 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
2992 * [`--test-threads=0` produces an error][38945]
2993 * [`rustup` installs documentation by default][40526]
2994 * [The Rust source includes NatVis visualizations][39843]. These can be used by
2995 WinDbg and Visual Studio to improve the debugging experience.
3000 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
3001 workaround, either use MSVC 2015 or run vcvars.bat.
3002 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3003 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
3004 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
3006 * [`format!` and `Display::to_string` panic if an underlying formatting
3007 implementation returns an error][40117]. Previously the error was silently
3008 ignored. It is incorrect for `write_fmt` to return an error when writing
3010 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
3011 crates were marked stable and could be accessed from the stable toolchain.
3012 * [Rust git source no longer includes vendored crates][39728]. Those that need
3013 to build with vendored crates should build from release tarballs.
3014 * [Fix inert attributes from `proc_macro_derives`][39572]
3015 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
3016 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
3018 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
3019 existing code generally ignores the type of dead-code unless a type-hint is
3020 provided; this can cause surprising inference interactions particularly around
3021 defaulting. The new code uniformly ignores the result type of dead-code.
3022 * [Tuple-struct constructors with private fields are no longer visible][38932]
3023 * [Lifetime parameters that do not appear in the arguments are now considered
3024 early-bound][38897], resolving a soundness bug (#[32330]). The
3025 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
3027 * [rustdoc: fix doctests with non-feature crate attributes][38161]
3028 * [Make transmuting from fn item types to pointer-sized types a hard
3031 [27787]: https://github.com/rust-lang/rust/issues/27787
3032 [32330]: https://github.com/rust-lang/rust/issues/32330
3033 [34198]: https://github.com/rust-lang/rust/pull/34198
3034 [38161]: https://github.com/rust-lang/rust/pull/38161
3035 [38368]: https://github.com/rust-lang/rust/pull/38368
3036 [38584]: https://github.com/rust-lang/rust/issues/38584
3037 [38661]: https://github.com/rust-lang/rust/pull/38661
3038 [38764]: https://github.com/rust-lang/rust/pull/38764
3039 [38864]: https://github.com/rust-lang/rust/issues/38864
3040 [38897]: https://github.com/rust-lang/rust/pull/38897
3041 [38921]: https://github.com/rust-lang/rust/pull/38921
3042 [38932]: https://github.com/rust-lang/rust/pull/38932
3043 [38945]: https://github.com/rust-lang/rust/pull/38945
3044 [38981]: https://github.com/rust-lang/rust/pull/38981
3045 [39002]: https://github.com/rust-lang/rust/pull/39002
3046 [39116]: https://github.com/rust-lang/rust/pull/39116
3047 [39193]: https://github.com/rust-lang/rust/pull/39193
3048 [39265]: https://github.com/rust-lang/rust/pull/39265
3049 [39356]: https://github.com/rust-lang/rust/pull/39356
3050 [39372]: https://github.com/rust-lang/rust/pull/39372
3051 [39426]: https://github.com/rust-lang/rust/pull/39426
3052 [39431]: https://github.com/rust-lang/rust/pull/39431
3053 [39438]: https://github.com/rust-lang/rust/pull/39438
3054 [39440]: https://github.com/rust-lang/rust/pull/39440
3055 [39485]: https://github.com/rust-lang/rust/pull/39485
3056 [39491]: https://github.com/rust-lang/rust/pull/39491
3057 [39518]: https://github.com/rust-lang/rust/pull/39518
3058 [39538]: https://github.com/rust-lang/rust/pull/39538
3059 [39572]: https://github.com/rust-lang/rust/pull/39572
3060 [39633]: https://github.com/rust-lang/rust/pull/39633
3061 [39642]: https://github.com/rust-lang/rust/pull/39642
3062 [39728]: https://github.com/rust-lang/rust/pull/39728
3063 [39761]: https://github.com/rust-lang/rust/pull/39761
3064 [39788]: https://github.com/rust-lang/rust/pull/39788
3065 [39793]: https://github.com/rust-lang/rust/pull/39793
3066 [39837]: https://github.com/rust-lang/rust/pull/39837
3067 [39843]: https://github.com/rust-lang/rust/pull/39843
3068 [39851]: https://github.com/rust-lang/rust/pull/39851
3069 [39903]: https://github.com/rust-lang/rust/pull/39903
3070 [39939]: https://github.com/rust-lang/rust/pull/39939
3071 [39953]: https://github.com/rust-lang/rust/pull/39953
3072 [39960]: https://github.com/rust-lang/rust/pull/39960
3073 [39990]: https://github.com/rust-lang/rust/pull/39990
3074 [39995]: https://github.com/rust-lang/rust/pull/39995
3075 [40008]: https://github.com/rust-lang/rust/pull/40008
3076 [40009]: https://github.com/rust-lang/rust/pull/40009
3077 [40027]: https://github.com/rust-lang/rust/pull/40027
3078 [40028]: https://github.com/rust-lang/rust/pull/40028
3079 [40037]: https://github.com/rust-lang/rust/pull/40037
3080 [40117]: https://github.com/rust-lang/rust/pull/40117
3081 [40166]: https://github.com/rust-lang/rust/pull/40166
3082 [40245]: https://github.com/rust-lang/rust/pull/40245
3083 [40257]: https://github.com/rust-lang/rust/pull/40257
3084 [40261]: https://github.com/rust-lang/rust/pull/40261
3085 [40265]: https://github.com/rust-lang/rust/pull/40265
3086 [40319]: https://github.com/rust-lang/rust/pull/40319
3087 [40336]: https://github.com/rust-lang/rust/pull/40336
3088 [40526]: https://github.com/rust-lang/rust/pull/40526
3089 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3090 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
3091 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
3092 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
3093 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
3094 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
3095 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
3096 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
3097 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
3098 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
3099 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
3100 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
3101 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
3102 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
3103 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
3104 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
3105 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
3106 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
3107 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
3108 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
3109 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
3110 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
3111 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
3112 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
3113 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
3114 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
3115 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
3116 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
3117 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
3118 [mdbook]: https://crates.io/crates/mdbook
3119 [ubook]: https://doc.rust-lang.org/unstable-book/
3122 Version 1.16.0 (2017-03-16)
3123 ===========================
3128 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3129 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3130 match patterns][38069]
3131 * [Clean up semantics of `self` in an import list][38313]
3132 * [`Self` may appear in `impl` headers][38920]
3133 * [`Self` may appear in struct expressions][39282]
3138 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
3139 a `.rmeta` file containing only crate metadata][38571]. This can be
3140 used by tools like the Rust Language Service to perform
3141 metadata-only builds.
3142 * [Levenshtein based typo suggestions now work in most places, while
3143 previously they worked only for fields and sometimes for local
3144 variables][38927]. Together with the overhaul of "no
3145 resolution"/"unexpected resolution" errors (#[38154]) they result in
3146 large and systematic improvement in resolution diagnostics.
3147 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
3149 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
3150 * [`rustc` no longer attempts to provide "consider using an explicit
3151 lifetime" suggestions][37057]. They were inaccurate.
3156 * [`VecDeque::truncate`]
3157 * [`VecDeque::resize`]
3158 * [`String::insert_str`]
3159 * [`Duration::checked_add`]
3160 * [`Duration::checked_sub`]
3161 * [`Duration::checked_div`]
3162 * [`Duration::checked_mul`]
3165 * [`SocketAddr::is_ipv4`]
3166 * [`SocketAddr::is_ipv6`]
3167 * [`IpAddr::is_ipv4`]
3168 * [`IpAddr::is_ipv6`]
3170 * [`Vec::dedup_by_key`]
3171 * [`Result::unwrap_or_default`]
3172 * [`<*const T>::wrapping_offset`]
3173 * [`<*mut T>::wrapping_offset`]
3174 * `CommandExt::creation_flags`
3175 * [`File::set_permissions`]
3176 * [`String::split_off`]
3181 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
3182 their argument by `Borrow` parameter][37761]
3183 * [All public types in std implement `Debug`][38006]
3184 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
3185 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
3186 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3188 * [std: Fix partial writes in `LineWriter`][38062]
3189 * [std: Clamp max read/write sizes on Unix][38062]
3190 * [Use more specific panic message for `&str` slicing errors][38066]
3191 * [`TcpListener::set_only_v6` is deprecated][38304]. This
3192 functionality cannot be achieved in std currently.
3193 * [`writeln!`, like `println!`, now accepts a form with no string
3194 or formatting arguments, to just print a newline][38469]
3195 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
3196 * [Reduce the size of static data in `std_unicode::tables`][38781]
3197 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
3198 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
3200 * [`Duration` implements `Sum`][38712]
3201 * [`String` implements `ToSocketAddrs`][39048]
3206 * [The `cargo check` command does a type check of a project without
3207 building it][cargo/3296]
3208 * [crates.io will display CI badges from Travis and AppVeyor, if
3209 specified in Cargo.toml][cargo/3546]
3210 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
3211 * [Compilation profiles accept integer values for `debug`, in addition
3212 to `true` and `false`. These are passed to `rustc` as the value to
3213 `-C debuginfo`][cargo/3534]
3214 * [Implement `cargo --version --verbose`][cargo/3604]
3215 * [All builds now output 'dep-info' build dependencies compatible with
3216 make and ninja][cargo/3557]
3217 * [Build all workspace members with `build --all`][cargo/3511]
3218 * [Document all workspace members with `doc --all`][cargo/3515]
3219 * [Path deps outside workspace are not members][cargo/3443]
3224 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
3225 the path to the Rust implementation][38589]
3226 * [The `armv7-linux-androideabi` target no longer enables NEON
3227 extensions, per Google's ABI guide][38413]
3228 * [The stock standard library can be compiled for Redox OS][38401]
3229 * [Rust has initial SPARC support][38726]. Tier 3. No builds
3231 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
3233 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
3238 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3239 match patterns][38069]
3240 * In this release, references to uninhabited types can not be
3241 pattern-matched. This was accidentally allowed in 1.15.
3242 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3243 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3245 * [Clean up semantics of `self` in an import list][38313]
3246 * Reimplemented lifetime elision. This change was almost entirely compatible
3247 with existing code, but it did close a number of small bugs and loopholes,
3248 as well as being more accepting in some other [cases][41105].
3250 [37057]: https://github.com/rust-lang/rust/pull/37057
3251 [37761]: https://github.com/rust-lang/rust/pull/37761
3252 [38006]: https://github.com/rust-lang/rust/pull/38006
3253 [38051]: https://github.com/rust-lang/rust/pull/38051
3254 [38062]: https://github.com/rust-lang/rust/pull/38062
3255 [38062]: https://github.com/rust-lang/rust/pull/38622
3256 [38066]: https://github.com/rust-lang/rust/pull/38066
3257 [38069]: https://github.com/rust-lang/rust/pull/38069
3258 [38131]: https://github.com/rust-lang/rust/pull/38131
3259 [38154]: https://github.com/rust-lang/rust/pull/38154
3260 [38274]: https://github.com/rust-lang/rust/pull/38274
3261 [38304]: https://github.com/rust-lang/rust/pull/38304
3262 [38313]: https://github.com/rust-lang/rust/pull/38313
3263 [38314]: https://github.com/rust-lang/rust/pull/38314
3264 [38327]: https://github.com/rust-lang/rust/pull/38327
3265 [38401]: https://github.com/rust-lang/rust/pull/38401
3266 [38413]: https://github.com/rust-lang/rust/pull/38413
3267 [38469]: https://github.com/rust-lang/rust/pull/38469
3268 [38559]: https://github.com/rust-lang/rust/pull/38559
3269 [38571]: https://github.com/rust-lang/rust/pull/38571
3270 [38580]: https://github.com/rust-lang/rust/pull/38580
3271 [38589]: https://github.com/rust-lang/rust/pull/38589
3272 [38670]: https://github.com/rust-lang/rust/pull/38670
3273 [38712]: https://github.com/rust-lang/rust/pull/38712
3274 [38726]: https://github.com/rust-lang/rust/pull/38726
3275 [38781]: https://github.com/rust-lang/rust/pull/38781
3276 [38798]: https://github.com/rust-lang/rust/pull/38798
3277 [38909]: https://github.com/rust-lang/rust/pull/38909
3278 [38920]: https://github.com/rust-lang/rust/pull/38920
3279 [38927]: https://github.com/rust-lang/rust/pull/38927
3280 [39048]: https://github.com/rust-lang/rust/pull/39048
3281 [39282]: https://github.com/rust-lang/rust/pull/39282
3282 [39379]: https://github.com/rust-lang/rust/pull/39379
3283 [41105]: https://github.com/rust-lang/rust/issues/41105
3284 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3285 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3286 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
3287 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
3288 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
3289 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
3290 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
3291 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
3292 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
3293 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
3294 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
3295 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
3296 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
3297 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
3298 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
3299 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
3300 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
3301 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
3302 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
3303 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
3304 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
3305 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
3306 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
3307 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
3308 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
3309 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
3310 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
3311 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
3312 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
3313 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3316 Version 1.15.1 (2017-02-09)
3317 ===========================
3319 * [Fix IntoIter::as_mut_slice's signature][39466]
3320 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
3322 [39466]: https://github.com/rust-lang/rust/pull/39466
3323 [39523]: https://github.com/rust-lang/rust/pull/39523
3326 Version 1.15.0 (2017-02-02)
3327 ===========================
3332 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
3333 stable. This allows popular code-generating crates like Serde and Diesel to
3334 work ergonomically. [RFC 1681].
3335 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
3336 with curly braces][36868]. Part of [RFC 1506].
3337 * [A number of minor changes to name resolution have been activated][37127].
3338 They add up to more consistent semantics, allowing for future evolution of
3339 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3340 details of what is different. The breaking changes here have been transitioned
3341 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3342 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
3344 * [`?Sized` can be used in `where` clauses][37791]
3345 * [There is now a limit on the size of monomorphized types and it can be
3346 modified with the `#![type_size_limit]` crate attribute, similarly to
3347 the `#![recursion_limit]` attribute][37789]
3352 * [On Windows, the compiler will apply dllimport attributes when linking to
3353 extern functions][37973]. Additional attributes and flags can control which
3354 library kind is linked and its name. [RFC 1717].
3355 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3356 * [The `--test` flag works with procedural macro crates][38107]
3357 * [Fix `extern "aapcs" fn` ABI][37814]
3358 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
3359 * [The `format!` expander recognizes incorrect `printf` and shell-style
3360 formatting directives and suggests the correct format][37613].
3361 * [Only report one error for all unused imports in an import list][37456]
3363 Compiler Performance
3364 --------------------
3366 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
3367 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
3368 * [Don't clone in `UnificationTable::probe`][37848]
3369 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
3370 * [Use small vectors in type walker][37760]
3371 * [Macro expansion performance was improved][37701]
3372 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
3373 * [Replace FNV with a faster hash function][37229]
3378 * [`std::iter::Iterator::min_by`]
3379 * [`std::iter::Iterator::max_by`]
3380 * [`std::os::*::fs::FileExt`]
3381 * [`std::sync::atomic::Atomic*::get_mut`]
3382 * [`std::sync::atomic::Atomic*::into_inner`]
3383 * [`std::vec::IntoIter::as_slice`]
3384 * [`std::vec::IntoIter::as_mut_slice`]
3385 * [`std::sync::mpsc::Receiver::try_iter`]
3386 * [`std::os::unix::process::CommandExt::before_exec`]
3387 * [`std::rc::Rc::strong_count`]
3388 * [`std::rc::Rc::weak_count`]
3389 * [`std::sync::Arc::strong_count`]
3390 * [`std::sync::Arc::weak_count`]
3391 * [`std::char::encode_utf8`]
3392 * [`std::char::encode_utf16`]
3393 * [`std::cell::Ref::clone`]
3394 * [`std::io::Take::into_inner`]
3399 * [The standard sorting algorithm has been rewritten for dramatic performance
3400 improvements][38192]. It is a hybrid merge sort, drawing influences from
3401 Timsort. Previously it was a naive merge sort.
3402 * [`Iterator::nth` no longer has a `Sized` bound][38134]
3403 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
3405 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
3406 and `char_indices().last()`][37882]
3407 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
3408 * [Chinese characters display correctly in `fmt::Debug`][37855]
3409 * [Derive `Default` for `Duration`][37699]
3410 * [Support creation of anonymous pipes on WinXP/2k][37677]
3411 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
3412 * [Don't pass overlapped handles to processes][38835]
3417 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3418 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3419 should instead check the variable at runtime with `std::env`. That the value
3420 was set at build time was a bug, and incorrect when cross-compiling. This
3421 change is known to cause breakage.
3422 * [Add `--all` flag to `cargo test`][cargo/3221]
3423 * [Compile statically against the MSVC CRT][cargo/3363]
3424 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
3425 * [Link OpenSSL statically on OSX][cargo/3311]
3426 * [Apply new fingerprinting to build dir outputs][cargo/3310]
3427 * [Test for bad path overrides with summaries][cargo/3336]
3428 * [Require `cargo install --vers` to take a semver version][cargo/3338]
3429 * [Fix retrying crate downloads for network errors][cargo/3348]
3430 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
3431 * [Emit more info on --message-format=json][cargo/3319]
3432 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
3433 * [Don't ignore errors in workspace manifest][cargo/3409]
3434 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
3439 * [Test runners (binaries built with `--test`) now support a `--list` argument
3440 that lists the tests it contains][38185]
3441 * [Test runners now support a `--exact` argument that makes the test filter
3442 match exactly, instead of matching only a substring of the test name][38181]
3443 * [rustdoc supports a `--playground-url` flag][37763]
3444 * [rustdoc provides more details about `#[should_panic]` errors][37749]
3449 * [The Rust build system is now written in Rust][37817]. The Makefiles may
3450 continue to be used in this release by passing `--disable-rustbuild` to the
3451 configure script, but they will be deleted soon. Note that the new build
3452 system uses a different on-disk layout that will likely affect any scripts
3454 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
3456 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
3457 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
3463 * [A number of minor changes to name resolution have been activated][37127].
3464 They add up to more consistent semantics, allowing for future evolution of
3465 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3466 details of what is different. The breaking changes here have been transitioned
3467 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3468 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3469 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3470 should instead check the variable at runtime with `std::env`. That the value
3471 was set at build time was a bug, and incorrect when cross-compiling. This
3472 change is known to cause breakage.
3473 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
3474 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
3475 1.10 and is now an error by default. It will become a hard error in the near
3477 * [The semantics relating modules to file system directories are changing in
3478 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
3479 lint, which is a warning in this release, and will become a hard error in the
3481 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3482 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
3483 the underlying iterator][37834]
3485 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
3486 [33685]: https://github.com/rust-lang/rust/issues/33685
3487 [36868]: https://github.com/rust-lang/rust/pull/36868
3488 [37127]: https://github.com/rust-lang/rust/pull/37127
3489 [37229]: https://github.com/rust-lang/rust/pull/37229
3490 [37456]: https://github.com/rust-lang/rust/pull/37456
3491 [37527]: https://github.com/rust-lang/rust/pull/37527
3492 [37602]: https://github.com/rust-lang/rust/pull/37602
3493 [37613]: https://github.com/rust-lang/rust/pull/37613
3494 [37615]: https://github.com/rust-lang/rust/pull/37615
3495 [37636]: https://github.com/rust-lang/rust/pull/37636
3496 [37627]: https://github.com/rust-lang/rust/pull/37627
3497 [37642]: https://github.com/rust-lang/rust/pull/37642
3498 [37677]: https://github.com/rust-lang/rust/pull/37677
3499 [37699]: https://github.com/rust-lang/rust/pull/37699
3500 [37701]: https://github.com/rust-lang/rust/pull/37701
3501 [37705]: https://github.com/rust-lang/rust/pull/37705
3502 [37749]: https://github.com/rust-lang/rust/pull/37749
3503 [37760]: https://github.com/rust-lang/rust/pull/37760
3504 [37763]: https://github.com/rust-lang/rust/pull/37763
3505 [37764]: https://github.com/rust-lang/rust/pull/37764
3506 [37789]: https://github.com/rust-lang/rust/pull/37789
3507 [37791]: https://github.com/rust-lang/rust/pull/37791
3508 [37814]: https://github.com/rust-lang/rust/pull/37814
3509 [37817]: https://github.com/rust-lang/rust/pull/37817
3510 [37834]: https://github.com/rust-lang/rust/pull/37834
3511 [37848]: https://github.com/rust-lang/rust/pull/37848
3512 [37855]: https://github.com/rust-lang/rust/pull/37855
3513 [37882]: https://github.com/rust-lang/rust/pull/37882
3514 [37888]: https://github.com/rust-lang/rust/pull/37888
3515 [37973]: https://github.com/rust-lang/rust/pull/37973
3516 [37979]: https://github.com/rust-lang/rust/pull/37979
3517 [38086]: https://github.com/rust-lang/rust/pull/38086
3518 [38107]: https://github.com/rust-lang/rust/pull/38107
3519 [38117]: https://github.com/rust-lang/rust/pull/38117
3520 [38134]: https://github.com/rust-lang/rust/pull/38134
3521 [38146]: https://github.com/rust-lang/rust/pull/38146
3522 [38181]: https://github.com/rust-lang/rust/pull/38181
3523 [38182]: https://github.com/rust-lang/rust/pull/38182
3524 [38185]: https://github.com/rust-lang/rust/pull/38185
3525 [38192]: https://github.com/rust-lang/rust/pull/38192
3526 [38279]: https://github.com/rust-lang/rust/pull/38279
3527 [38835]: https://github.com/rust-lang/rust/pull/38835
3528 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3529 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3530 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
3531 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
3532 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
3533 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
3534 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
3535 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
3536 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
3537 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
3538 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
3539 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
3540 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
3541 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
3542 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
3543 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
3544 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
3545 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
3546 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
3547 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
3548 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
3549 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
3550 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
3551 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
3552 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
3553 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
3554 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
3555 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
3556 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
3557 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
3558 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
3559 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
3560 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
3561 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
3562 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
3563 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
3564 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
3565 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
3568 Version 1.14.0 (2016-12-22)
3569 ===========================
3574 * [`..` matches multiple tuple fields in enum variants, structs
3575 and tuples][36843]. [RFC 1492].
3576 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
3577 * [`use *` and `use ::*` both glob-import from the crate root][37367]
3578 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
3579 dereferencing][36822]
3584 * [Mark enums with non-zero discriminant as non-zero][37224]
3585 * [Lower-case `static mut` names are linted like other
3586 statics and consts][37162]
3587 * [Fix ICE on some macros in const integer positions
3588 (e.g. `[u8; m!()]`)][36819]
3589 * [Improve error message and snippet for "did you mean `x`"][36798]
3590 * [Add a panic-strategy field to the target specification][36794]
3591 * [Include LLVM version in `--version --verbose`][37200]
3593 Compile-time Optimizations
3594 --------------------------
3596 * [Improve macro expansion performance][37569]
3597 * [Shrink `Expr_::ExprInlineAsm`][37445]
3598 * [Replace all uses of SHA-256 with BLAKE2b][37439]
3599 * [Reduce the number of bytes hashed by `IchHasher`][37427]
3600 * [Avoid more allocations when compiling html5ever][37373]
3601 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
3602 * [Avoid some allocations in the macro parser][37318]
3603 * [Use a faster deflate setting][37298]
3604 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
3605 during interning of slices][37270]
3606 * [Optimize `write_metadata`][37267]
3607 * [Don't process obligation forest cycles when stalled][37231]
3608 * [Avoid many `CrateConfig` clones][37161]
3609 * [Optimize `Substs::super_fold_with`][37108]
3610 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
3611 * [Speed up `plug_leaks`][36917]
3616 * [`println!()`, with no arguments, prints newline][36825].
3617 Previously, an empty string was required to achieve the same.
3618 * [`Wrapping` impls standard binary and unary operators, as well as
3619 the `Sum` and `Product` iterators][37356]
3620 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
3622 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
3623 `VecDeque` iterators][37315]
3624 * [Improve `SipHasher` performance on small values][37312]
3625 * [Add Iterator trait TrustedLen to enable better FromIterator /
3627 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
3628 * [`ReadDir` implements `Debug`][37221]
3629 * [Implement `RefUnwindSafe` for atomic types][37178]
3630 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
3631 * [Avoid allocations in `Decoder::read_str`][37064]
3632 * [`io::Error` implements `From<io::ErrorKind>`][37037]
3633 * [Impl `Debug` for raw pointers to unsized data][36880]
3634 * [Don't reuse `HashMap` random seeds][37470]
3635 * [The internal memory layout of `HashMap` is more cache-friendly, for
3636 significant improvements in some operations][36692]
3637 * [`HashMap` uses less memory on 32-bit architectures][36595]
3638 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
3643 * [Expose rustc cfg values to build scripts][cargo/3243]
3644 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
3645 * [Fix passing --features when testing multiple packages][cargo/3280]
3646 * [Use a single profile set per workspace][cargo/3249]
3647 * [Load `replace` sections from lock files][cargo/3220]
3648 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
3653 * [rustup is the recommended Rust installation method][1.14rustup]
3654 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
3655 S390x. These are [tier 2] platforms and may have major defects. Follow the
3656 instructions on the website to install, or add the targets to an existing
3657 installation with `rustup target add`. The new target triples are:
3658 - `mips-unknown-linux-gnu`
3659 - `mipsel-unknown-linux-gnu`
3660 - `mips64-unknown-linux-gnuabi64`
3661 - `mips64el-unknown-linux-gnuabi64 `
3662 - `powerpc-unknown-linux-gnu`
3663 - `powerpc64-unknown-linux-gnu`
3664 - `powerpc64le-unknown-linux-gnu`
3665 - `s390x-unknown-linux-gnu `
3666 * This release includes target (std) builds for ARM Linux running MUSL
3667 libc. These are [tier 2] platforms and may have major defects. Add the
3668 following triples to an existing rustup installation with `rustup target add`:
3669 - `arm-unknown-linux-musleabi`
3670 - `arm-unknown-linux-musleabihf`
3671 - `armv7-unknown-linux-musleabihf`
3672 * This release includes [experimental support for WebAssembly][1.14wasm], via
3673 the `wasm32-unknown-emscripten` target. This target is known to have major
3674 defects. Please test, report, and fix.
3675 * rustup no longer installs documentation by default. Run `rustup
3676 component add rust-docs` to install.
3677 * [Fix line stepping in debugger][37310]
3678 * [Enable line number debuginfo in releases][37280]
3683 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3684 * [Add support for Fuchsia OS][37313]
3685 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3690 * [A number of forward-compatibility lints used by the compiler
3691 to gradually introduce language changes have been converted
3692 to deny by default][36894]:
3693 - ["use of inaccessible extern crate erroneously allowed"][36886]
3694 - ["type parameter default erroneously allowed in invalid location"][36887]
3695 - ["detects super or self keywords at the beginning of global path"][36888]
3696 - ["two overlapping inherent impls define an item with the same name
3697 were erroneously allowed"][36889]
3698 - ["floating-point constants cannot be used in patterns"][36890]
3699 - ["constants of struct or enum type can only be used in a pattern if
3700 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3701 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3702 * [Prohibit patterns in trait methods without bodies][37378]
3703 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3704 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3705 * [The `$crate` macro variable is accepted in fewer locations][37213]
3706 * [Impls specifying extra region requirements beyond the trait
3707 they implement are rejected][37167]
3708 * [Enums may not be unsized][37111]. Unsized enums are intended to
3709 work but never have. For now they are forbidden.
3710 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3712 [tier 2]: https://forge.rust-lang.org/platform-support.html
3713 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3714 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3715 [36430]: https://github.com/rust-lang/rust/pull/36430
3716 [36595]: https://github.com/rust-lang/rust/pull/36595
3717 [36595]: https://github.com/rust-lang/rust/pull/36595
3718 [36692]: https://github.com/rust-lang/rust/pull/36692
3719 [36767]: https://github.com/rust-lang/rust/pull/36767
3720 [36794]: https://github.com/rust-lang/rust/pull/36794
3721 [36798]: https://github.com/rust-lang/rust/pull/36798
3722 [36819]: https://github.com/rust-lang/rust/pull/36819
3723 [36822]: https://github.com/rust-lang/rust/pull/36822
3724 [36825]: https://github.com/rust-lang/rust/pull/36825
3725 [36843]: https://github.com/rust-lang/rust/pull/36843
3726 [36880]: https://github.com/rust-lang/rust/pull/36880
3727 [36886]: https://github.com/rust-lang/rust/issues/36886
3728 [36887]: https://github.com/rust-lang/rust/issues/36887
3729 [36888]: https://github.com/rust-lang/rust/issues/36888
3730 [36889]: https://github.com/rust-lang/rust/issues/36889
3731 [36890]: https://github.com/rust-lang/rust/issues/36890
3732 [36891]: https://github.com/rust-lang/rust/issues/36891
3733 [36892]: https://github.com/rust-lang/rust/issues/36892
3734 [36894]: https://github.com/rust-lang/rust/pull/36894
3735 [36917]: https://github.com/rust-lang/rust/pull/36917
3736 [36993]: https://github.com/rust-lang/rust/pull/36993
3737 [37037]: https://github.com/rust-lang/rust/pull/37037
3738 [37064]: https://github.com/rust-lang/rust/pull/37064
3739 [37094]: https://github.com/rust-lang/rust/pull/37094
3740 [37108]: https://github.com/rust-lang/rust/pull/37108
3741 [37111]: https://github.com/rust-lang/rust/pull/37111
3742 [37161]: https://github.com/rust-lang/rust/pull/37161
3743 [37162]: https://github.com/rust-lang/rust/pull/37162
3744 [37167]: https://github.com/rust-lang/rust/pull/37167
3745 [37178]: https://github.com/rust-lang/rust/pull/37178
3746 [37200]: https://github.com/rust-lang/rust/pull/37200
3747 [37213]: https://github.com/rust-lang/rust/pull/37213
3748 [37221]: https://github.com/rust-lang/rust/pull/37221
3749 [37224]: https://github.com/rust-lang/rust/pull/37224
3750 [37230]: https://github.com/rust-lang/rust/pull/37230
3751 [37231]: https://github.com/rust-lang/rust/pull/37231
3752 [37247]: https://github.com/rust-lang/rust/pull/37247
3753 [37267]: https://github.com/rust-lang/rust/pull/37267
3754 [37270]: https://github.com/rust-lang/rust/pull/37270
3755 [37273]: https://github.com/rust-lang/rust/pull/37273
3756 [37280]: https://github.com/rust-lang/rust/pull/37280
3757 [37298]: https://github.com/rust-lang/rust/pull/37298
3758 [37306]: https://github.com/rust-lang/rust/pull/37306
3759 [37310]: https://github.com/rust-lang/rust/pull/37310
3760 [37312]: https://github.com/rust-lang/rust/pull/37312
3761 [37313]: https://github.com/rust-lang/rust/pull/37313
3762 [37315]: https://github.com/rust-lang/rust/pull/37315
3763 [37318]: https://github.com/rust-lang/rust/pull/37318
3764 [37322]: https://github.com/rust-lang/rust/pull/37322
3765 [37326]: https://github.com/rust-lang/rust/pull/37326
3766 [37351]: https://github.com/rust-lang/rust/pull/37351
3767 [37356]: https://github.com/rust-lang/rust/pull/37356
3768 [37367]: https://github.com/rust-lang/rust/pull/37367
3769 [37373]: https://github.com/rust-lang/rust/pull/37373
3770 [37378]: https://github.com/rust-lang/rust/pull/37378
3771 [37389]: https://github.com/rust-lang/rust/pull/37389
3772 [37392]: https://github.com/rust-lang/rust/pull/37392
3773 [37427]: https://github.com/rust-lang/rust/pull/37427
3774 [37439]: https://github.com/rust-lang/rust/pull/37439
3775 [37445]: https://github.com/rust-lang/rust/pull/37445
3776 [37470]: https://github.com/rust-lang/rust/pull/37470
3777 [37569]: https://github.com/rust-lang/rust/pull/37569
3778 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3779 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
3780 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
3781 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
3782 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
3783 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
3784 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
3787 Version 1.13.0 (2016-11-10)
3788 ===========================
3793 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
3794 errors, like the `try!` macro, described in [RFC 0243].
3795 * [Stabilize macros in type position][36014]. Described in [RFC 873].
3796 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
3797 * [Fix `#[derive]` for empty tuple structs/variants][35728]
3798 * [Fix lifetime rules for 'if' conditions][36029]
3799 * [Avoid loading and parsing unconfigured non-inline modules][36482]
3804 * [Add the `-C link-arg` argument][36574]
3805 * [Remove the old AST-based backend from rustc_trans][35764]
3806 * [Don't enable NEON by default on armv7 Linux][35814]
3807 * [Fix debug line number info for macro expansions][35238]
3808 * [Do not emit "class method" debuginfo for types that are not
3809 DICompositeType][36008]
3810 * [Warn about multiple conflicting #[repr] hints][34623]
3811 * [When sizing DST, don't double-count nested struct prefixes][36351]
3812 * [Default RUST_MIN_STACK to 16MiB for now][36505]
3813 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
3814 * [Reject macros with empty repetitions to avoid infinite loop][36721]
3815 * [Expand macros without recursing to avoid stack overflows][36214]
3820 * [Replace macro backtraces with labeled local uses][35702]
3821 * [Improve error message for misplaced doc comments][33922]
3822 * [Buffer unix and lock windows to prevent message interleaving][35975]
3823 * [Update lifetime errors to specifically note temporaries][36171]
3824 * [Special case a few colors for Windows][36178]
3825 * [Suggest `use self` when such an import resolves][36289]
3826 * [Be more specific when type parameter shadows primitive type][36338]
3827 * Many minor improvements
3829 Compile-time Optimizations
3830 --------------------------
3832 * [Compute and cache HIR hashes at beginning][35854]
3833 * [Don't hash types in loan paths][36004]
3834 * [Cache projections in trans][35761]
3835 * [Optimize the parser's last token handling][36527]
3836 * [Only instantiate #[inline] functions in codegen units referencing
3837 them][36524]. This leads to big improvements in cases where crates export
3838 define many inline functions without using them directly.
3839 * [Lazily allocate TypedArena's first chunk][36592]
3840 * [Don't allocate during default HashSet creation][36734]
3847 * [`overflowing_abs`]
3848 * [`RefCell::try_borrow`]
3849 * [`RefCell::try_borrow_mut`]
3854 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
3855 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
3857 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
3858 * [Implement `Debug` for `std::vec::IntoIter`][35707]
3859 * [`CString`: avoid excessive growth just to 0-terminate][35871]
3860 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
3861 * [Use arc4rand on FreeBSD][35884]
3862 * [memrchr: Correct aligned offset computation][35969]
3863 * [Improve Demangling of Rust Symbols][36059]
3864 * [Use monotonic time in condition variables][35048]
3865 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
3866 * [Implement conversion traits for `char`][35755]
3867 * [Fix illegal instruction caused by overflow in channel cloning][36104]
3868 * [Zero first byte of CString on drop][36264]
3869 * [Inherit overflow checks for sum and product][36372]
3870 * [Add missing Eq implementations][36423]
3871 * [Implement `Debug` for `DirEntry`][36631]
3872 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
3874 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3875 * [Implement more traits for `std::io::ErrorKind`][35911]
3876 * [Optimize BinaryHeap bounds checking][36072]
3877 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
3878 `extend_with_element`][36355]
3879 * [Fix overflow checking in unsigned pow()][34942]
3884 * This release includes security fixes to both curl and OpenSSL.
3885 * [Fix transitive doctests when panic=abort][cargo/3021]
3886 * [Add --all-features flag to cargo][cargo/3038]
3887 * [Reject path-based dependencies in `cargo package`][cargo/3060]
3888 * [Don't parse the home directory more than once][cargo/3078]
3889 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
3890 * [Update OpenSSL to 1.0.2j][cargo/3121]
3891 * [Add license and license_file to cargo metadata output][cargo/3110]
3892 * [Make crates-io registry URL optional in config; ignore all changes to
3893 source.crates-io][cargo/3089]
3894 * [Don't download dependencies from other platforms][cargo/3123]
3895 * [Build transitive dev-dependencies when needed][cargo/3125]
3896 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
3897 * [Avoid updating registry when adding existing deps][cargo/3144]
3898 * [Warn about path overrides that won't work][cargo/3136]
3899 * [Use workspaces during `cargo install`][cargo/3146]
3900 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
3901 * [Add --message-format flag][cargo/3000]
3902 * [Pass target environment for rustdoc][cargo/3205]
3903 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
3904 * [Update curl and curl-sys][cargo/3241]
3905 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
3910 * [rustdoc: Add the `--sysroot` argument][36586]
3911 * [rustdoc: Fix a couple of issues with the search results][35655]
3912 * [rustdoc: remove the `!` from macro URLs and titles][35234]
3913 * [gdb: Fix pretty-printing special-cased Rust types][35585]
3914 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
3919 * [Remove unmaintained style guide][35124]
3920 * [Add s390x support][36369]
3921 * [Initial work at Haiku OS support][36727]
3922 * [Add mips-uclibc targets][35734]
3923 * [Crate-ify compiler-rt into compiler-builtins][35021]
3924 * [Add rustc version info (git hash + date) to dist tarball][36213]
3925 * Many documentation improvements
3930 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3931 * [Deny (by default) transmuting from fn item types to pointer-sized
3932 types][34923]. Continuing the long transition to zero-sized fn items,
3934 * [Fix `#[derive]` for empty tuple structs/variants][35728].
3936 * [Issue deprecation warnings for safe accesses to extern statics][36173]
3937 * [Fix lifetime rules for 'if' conditions][36029].
3938 * [Inherit overflow checks for sum and product][36372].
3939 * [Forbid user-defined macros named "macro_rules"][36730].
3941 [33922]: https://github.com/rust-lang/rust/pull/33922
3942 [34623]: https://github.com/rust-lang/rust/pull/34623
3943 [34923]: https://github.com/rust-lang/rust/pull/34923
3944 [34942]: https://github.com/rust-lang/rust/pull/34942
3945 [34982]: https://github.com/rust-lang/rust/pull/34982
3946 [35021]: https://github.com/rust-lang/rust/pull/35021
3947 [35048]: https://github.com/rust-lang/rust/pull/35048
3948 [35074]: https://github.com/rust-lang/rust/pull/35074
3949 [35124]: https://github.com/rust-lang/rust/pull/35124
3950 [35234]: https://github.com/rust-lang/rust/pull/35234
3951 [35238]: https://github.com/rust-lang/rust/pull/35238
3952 [35354]: https://github.com/rust-lang/rust/pull/35354
3953 [35559]: https://github.com/rust-lang/rust/pull/35559
3954 [35585]: https://github.com/rust-lang/rust/pull/35585
3955 [35627]: https://github.com/rust-lang/rust/pull/35627
3956 [35655]: https://github.com/rust-lang/rust/pull/35655
3957 [35702]: https://github.com/rust-lang/rust/pull/35702
3958 [35707]: https://github.com/rust-lang/rust/pull/35707
3959 [35728]: https://github.com/rust-lang/rust/pull/35728
3960 [35734]: https://github.com/rust-lang/rust/pull/35734
3961 [35755]: https://github.com/rust-lang/rust/pull/35755
3962 [35761]: https://github.com/rust-lang/rust/pull/35761
3963 [35764]: https://github.com/rust-lang/rust/pull/35764
3964 [35814]: https://github.com/rust-lang/rust/pull/35814
3965 [35854]: https://github.com/rust-lang/rust/pull/35854
3966 [35871]: https://github.com/rust-lang/rust/pull/35871
3967 [35884]: https://github.com/rust-lang/rust/pull/35884
3968 [35911]: https://github.com/rust-lang/rust/pull/35911
3969 [35969]: https://github.com/rust-lang/rust/pull/35969
3970 [35975]: https://github.com/rust-lang/rust/pull/35975
3971 [36004]: https://github.com/rust-lang/rust/pull/36004
3972 [36008]: https://github.com/rust-lang/rust/pull/36008
3973 [36014]: https://github.com/rust-lang/rust/pull/36014
3974 [36029]: https://github.com/rust-lang/rust/pull/36029
3975 [36059]: https://github.com/rust-lang/rust/pull/36059
3976 [36072]: https://github.com/rust-lang/rust/pull/36072
3977 [36101]: https://github.com/rust-lang/rust/pull/36101
3978 [36104]: https://github.com/rust-lang/rust/pull/36104
3979 [36171]: https://github.com/rust-lang/rust/pull/36171
3980 [36173]: https://github.com/rust-lang/rust/pull/36173
3981 [36178]: https://github.com/rust-lang/rust/pull/36178
3982 [36213]: https://github.com/rust-lang/rust/pull/36213
3983 [36214]: https://github.com/rust-lang/rust/pull/36214
3984 [36264]: https://github.com/rust-lang/rust/pull/36264
3985 [36266]: https://github.com/rust-lang/rust/pull/36266
3986 [36289]: https://github.com/rust-lang/rust/pull/36289
3987 [36338]: https://github.com/rust-lang/rust/pull/36338
3988 [36351]: https://github.com/rust-lang/rust/pull/36351
3989 [36355]: https://github.com/rust-lang/rust/pull/36355
3990 [36369]: https://github.com/rust-lang/rust/pull/36369
3991 [36372]: https://github.com/rust-lang/rust/pull/36372
3992 [36423]: https://github.com/rust-lang/rust/pull/36423
3993 [36482]: https://github.com/rust-lang/rust/pull/36482
3994 [36505]: https://github.com/rust-lang/rust/pull/36505
3995 [36524]: https://github.com/rust-lang/rust/pull/36524
3996 [36527]: https://github.com/rust-lang/rust/pull/36527
3997 [36551]: https://github.com/rust-lang/rust/pull/36551
3998 [36574]: https://github.com/rust-lang/rust/pull/36574
3999 [36586]: https://github.com/rust-lang/rust/pull/36586
4000 [36592]: https://github.com/rust-lang/rust/pull/36592
4001 [36631]: https://github.com/rust-lang/rust/pull/36631
4002 [36639]: https://github.com/rust-lang/rust/pull/36639
4003 [36721]: https://github.com/rust-lang/rust/pull/36721
4004 [36727]: https://github.com/rust-lang/rust/pull/36727
4005 [36730]: https://github.com/rust-lang/rust/pull/36730
4006 [36734]: https://github.com/rust-lang/rust/pull/36734
4007 [36754]: https://github.com/rust-lang/rust/pull/36754
4008 [36995]: https://github.com/rust-lang/rust/pull/36995
4009 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
4010 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
4011 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4012 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
4013 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
4014 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
4015 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
4016 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
4017 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
4018 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
4019 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
4020 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
4021 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
4022 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
4023 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
4024 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
4025 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
4026 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
4027 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
4028 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
4029 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
4030 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
4031 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
4032 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
4033 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
4034 [rustup]: https://www.rustup.rs
4035 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
4036 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
4037 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
4038 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
4039 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
4040 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
4041 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
4044 Version 1.12.1 (2016-10-20)
4045 ===========================
4050 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
4051 * [Confusion with double negation and booleans][36856]
4052 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
4053 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
4054 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
4055 * [Corrupted memory after updated to 1.12][36936]
4056 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
4057 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
4058 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
4060 [36381]: https://github.com/rust-lang/rust/issues/36381
4061 [36856]: https://github.com/rust-lang/rust/issues/36856
4062 [36875]: https://github.com/rust-lang/rust/issues/36875
4063 [36924]: https://github.com/rust-lang/rust/issues/36924
4064 [36926]: https://github.com/rust-lang/rust/issues/36926
4065 [36936]: https://github.com/rust-lang/rust/issues/36936
4066 [37026]: https://github.com/rust-lang/rust/issues/37026
4067 [37112]: https://github.com/rust-lang/rust/issues/37112
4068 [37153]: https://github.com/rust-lang/rust/issues/37153
4071 Version 1.12.0 (2016-09-29)
4072 ===========================
4077 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4078 This translation pass is far simpler than the previous AST->LLVM pass, and
4079 creates opportunities to perform new optimizations directly on the MIR. It
4080 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4081 * [`rustc` presents a new, more readable error format, along with
4082 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4083 Most common editors supporting Rust have been updated to work with it. It was
4084 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4089 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4090 This translation pass is far simpler than the previous AST->LLVM pass, and
4091 creates opportunities to perform new optimizations directly on the MIR. It
4092 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4093 * [Print the Rust target name, not the LLVM target name, with
4094 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
4095 * [The computation of `TypeId` is correct in some cases where it was previously
4096 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
4097 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
4098 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
4099 `--print relocation-models`, and `--print code-models` print the available
4100 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
4101 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
4102 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
4103 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
4104 These targets produce statically-linked binaries. There are no binary release
4110 * [`rustc` presents a new, more readable error format, along with
4111 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4112 Most common editors supporting Rust have been updated to work with it. It was
4113 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4114 * [In error descriptions, references are now described in plain English,
4115 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
4116 * [In error type descriptions, unknown numeric types are named `{integer}` or
4117 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
4118 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
4123 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
4124 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
4125 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
4126 useful](https://github.com/rust-lang/rust/pull/34908)
4127 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
4128 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
4129 * [Semicolons are properly required as statement delimiters inside
4130 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
4131 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4136 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
4137 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
4138 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
4139 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
4140 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
4141 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
4142 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
4143 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
4144 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
4145 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
4146 Both on Unix and Windows.
4147 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
4148 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
4149 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
4150 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
4151 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
4152 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
4153 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
4154 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
4159 * [The `format!` macro and friends now allow a single argument to be formatted
4160 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
4161 * [The lifetime bounds on `[T]::binary_search_by` and
4162 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
4163 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
4164 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
4165 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
4166 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
4167 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
4168 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
4169 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
4170 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
4171 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
4172 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
4173 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
4174 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
4175 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
4176 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
4177 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
4178 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
4179 * [`mpsc::sync_channel` `Receiver`s return any available message before
4180 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
4181 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
4182 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
4187 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
4188 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
4189 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
4190 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
4191 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
4192 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
4193 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
4194 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
4195 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
4196 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
4197 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
4198 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
4199 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
4200 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
4201 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
4202 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
4207 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
4208 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
4213 * [Test binaries now support a `--test-threads` argument to specify the number
4214 of threads used to run tests, and which acts the same as the
4215 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
4216 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
4217 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
4218 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4219 * [Rust releases now come with source packages that can be installed by rustup
4220 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
4221 The resulting source code can be used by tools and IDES, located in the
4222 sysroot under `lib/rustlib/src`.
4227 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
4228 * Many minor improvements to the documentation.
4229 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
4234 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
4235 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
4236 * [When formatting strings, if "precision" is specified, the "fill",
4237 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
4238 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
4241 Version 1.11.0 (2016-08-18)
4242 ===========================
4247 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4248 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
4249 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
4250 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
4251 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
4256 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
4257 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
4258 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
4259 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
4260 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
4261 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
4262 (in libcore - previously stabilized in libstd)
4263 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
4264 (in libcore - previously stabilized in libstd)
4265 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
4266 (in libcore - previously stabilized in libstd)
4267 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
4268 (in libcore - previously stabilized in libstd)
4269 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4270 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4271 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
4272 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
4277 * [The `thread_local!` macro supports multiple definitions in a single
4278 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
4279 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
4280 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
4281 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
4282 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
4283 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
4284 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
4285 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
4290 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
4291 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
4292 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
4293 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
4294 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
4295 and `-vv` prints warnings for all crates.
4296 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
4297 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
4298 This provides room for expansion by arbitrary tools.
4299 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
4300 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
4301 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
4302 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
4303 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
4304 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
4305 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
4310 * [Caching projections speeds up type check dramatically for some
4311 workloads](https://github.com/rust-lang/rust/pull/33816)
4312 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
4313 This hasher is faster, but is believed to provide sufficient
4314 protection from collision attacks.
4315 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
4320 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
4321 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
4322 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
4323 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
4324 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
4329 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
4330 * [When emitting debug info, rustc emits frame pointers for closures,
4331 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
4332 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4333 * Many more errors have been given error codes and extended
4335 * API documentation continues to be improved, with many new examples
4340 * [rustc no longer hangs when dependencies recursively re-export
4341 submodules](https://github.com/rust-lang/rust/pull/34542)
4342 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
4343 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
4344 rewritten](https://github.com/rust-lang/rust/pull/33895)
4345 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
4346 No targets use this yet, but it works toward AVR support.
4351 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
4352 * [The new follow-set rules that place restrictions on `macro_rules!`
4353 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
4354 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
4355 and has been a warning since 1.10.
4356 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
4357 This causes breakage in some corner cases.
4360 Version 1.10.0 (2016-07-07)
4361 ===========================
4366 * [Allow `concat_idents!` in type positions as well as in expression
4367 positions](https://github.com/rust-lang/rust/pull/33735).
4368 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
4369 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
4370 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
4371 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
4372 * [`panic!` can be converted to a runtime abort with the
4373 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
4374 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4375 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
4376 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
4377 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
4378 Note that Cargo does not yet directly support cdylibs.
4383 * `os::windows::fs::OpenOptionsExt::access_mode`
4384 * `os::windows::fs::OpenOptionsExt::share_mode`
4385 * `os::windows::fs::OpenOptionsExt::custom_flags`
4386 * `os::windows::fs::OpenOptionsExt::attributes`
4387 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
4388 * `os::unix::fs::OpenOptionsExt::custom_flags`
4389 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
4390 * `Default for sync::Weak`
4391 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
4392 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
4393 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
4394 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
4395 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
4396 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
4397 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
4398 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
4399 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
4400 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
4401 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
4402 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
4403 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
4404 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
4405 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
4406 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
4407 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
4408 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
4409 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
4410 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
4411 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
4412 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
4413 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
4414 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
4415 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
4416 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4417 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4418 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4419 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4420 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
4421 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
4422 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
4423 * Read/Write/RawFd impls for `UnixStream`
4424 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
4425 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
4426 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
4427 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
4428 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
4429 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
4430 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
4431 * RawFd impls for `UnixListener`
4432 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
4433 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
4434 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
4435 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
4436 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
4437 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
4438 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
4439 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
4440 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
4441 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
4442 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
4443 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
4444 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
4445 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
4446 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
4447 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
4448 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
4449 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
4450 * RawFd impls for `UnixDatagram`
4451 * `{BTree,Hash}Map::values_mut`
4452 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
4457 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
4458 The semantics of this minor method are subtle and probably not what
4460 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
4461 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
4462 will fall back to `/dev/urandom` temporarily to avoid blocking
4463 during early boot](https://github.com/rust-lang/rust/pull/33086).
4464 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
4465 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
4466 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
4467 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
4468 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
4469 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
4470 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
4474 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
4475 This controls the runtime behavior of the `panic!` macro
4476 and can be either "unwind" (the default), or "abort".
4477 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4478 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
4479 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
4480 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
4481 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
4482 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
4483 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
4484 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
4485 By default they are retried twice, which can be customized with the
4486 `net.retry` value in `.cargo/config`.
4487 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
4488 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
4489 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
4490 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
4491 Makes it possible to install multiple crates in parallel.
4492 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
4493 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
4494 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
4495 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
4496 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
4497 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
4502 * [rustc memory usage was reduced by refactoring the context used for
4503 type checking](https://github.com/rust-lang/rust/pull/33425).
4504 * [Speed up creation of `HashMap`s by caching the random keys used
4505 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
4506 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
4507 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
4508 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
4509 10x faster than the previous lookup tables.
4510 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
4515 * Many incremental improvements to documentation and rustdoc.
4516 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
4517 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
4518 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
4519 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
4520 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
4521 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
4522 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
4527 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
4528 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
4529 * [`std` no longer prints backtraces on platforms where the running
4530 module must be loaded with `env::current_exe`, which can't be relied
4531 on](https://github.com/rust-lang/rust/pull/33554).
4532 * This release includes std binaries for the i586-unknown-linux-gnu,
4533 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
4534 i586 target is for old x86 hardware without SSE2, and the armv7
4535 target is for Android running on modern ARM architectures.
4536 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
4537 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
4538 * [On Unix the runtime aborts by calling `libc::abort` instead of
4539 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
4540 * [Rust is now bootstrapped from the previous release of Rust,
4541 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
4546 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
4547 * [`target_env` for Linux ARM targets is just `gnu`, not
4548 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
4549 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
4550 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
4551 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
4552 Affects how macros are parsed.
4553 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
4554 * [Feature-gated attributes on macro-generated macro invocations are
4555 now rejected](https://github.com/rust-lang/rust/pull/32791).
4556 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
4557 This caused some minor changes to type inference.
4560 Version 1.9.0 (2016-05-26)
4561 ==========================
4566 * The `#[deprecated]` attribute when applied to an API will generate
4567 warnings when used. The warnings may be suppressed with
4568 `#[allow(deprecated)]`. [RFC 1270].
4569 * [`fn` item types are zero sized, and each `fn` names a unique
4570 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4571 `transmute` on a `fn` type will generate a warning for a few cycles,
4572 then will be converted to an error.
4573 * [Field and method resolution understand visibility, so private
4574 fields and methods cannot prevent the proper use of public fields
4575 and methods][1.9fv].
4576 * [The parser considers unicode codepoints in the
4577 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
4583 * [`std::panic::catch_unwind`][] (renamed from `recover`)
4584 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
4585 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
4586 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
4587 * [`str::is_char_boundary`]
4588 * [`<*const T>::as_ref`]
4589 * [`<*mut T>::as_ref`]
4590 * [`<*mut T>::as_mut`]
4591 * [`AsciiExt::make_ascii_uppercase`]
4592 * [`AsciiExt::make_ascii_lowercase`]
4593 * [`char::decode_utf16`]
4594 * [`char::DecodeUtf16`]
4595 * [`char::DecodeUtf16Error`]
4596 * [`char::DecodeUtf16Error::unpaired_surrogate`]
4597 * [`BTreeSet::take`]
4598 * [`BTreeSet::replace`]
4601 * [`HashSet::replace`]
4603 * [`OsString::with_capacity`]
4604 * [`OsString::clear`]
4605 * [`OsString::capacity`]
4606 * [`OsString::reserve`]
4607 * [`OsString::reserve_exact`]
4608 * [`OsStr::is_empty`]
4610 * [`std::os::unix::thread`]
4613 * [`JoinHandleExt::as_pthread_t`]
4614 * [`JoinHandleExt::into_pthread_t`]
4615 * [`HashSet::hasher`]
4616 * [`HashMap::hasher`]
4617 * [`CommandExt::exec`]
4618 * [`File::try_clone`]
4619 * [`SocketAddr::set_ip`]
4620 * [`SocketAddr::set_port`]
4621 * [`SocketAddrV4::set_ip`]
4622 * [`SocketAddrV4::set_port`]
4623 * [`SocketAddrV6::set_ip`]
4624 * [`SocketAddrV6::set_port`]
4625 * [`SocketAddrV6::set_flowinfo`]
4626 * [`SocketAddrV6::set_scope_id`]
4627 * [`slice::copy_from_slice`]
4628 * [`ptr::read_volatile`]
4629 * [`ptr::write_volatile`]
4630 * [`OpenOptions::create_new`]
4631 * [`TcpStream::set_nodelay`]
4632 * [`TcpStream::nodelay`]
4633 * [`TcpStream::set_ttl`]
4634 * [`TcpStream::ttl`]
4635 * [`TcpStream::set_only_v6`]
4636 * [`TcpStream::only_v6`]
4637 * [`TcpStream::take_error`]
4638 * [`TcpStream::set_nonblocking`]
4639 * [`TcpListener::set_ttl`]
4640 * [`TcpListener::ttl`]
4641 * [`TcpListener::set_only_v6`]
4642 * [`TcpListener::only_v6`]
4643 * [`TcpListener::take_error`]
4644 * [`TcpListener::set_nonblocking`]
4645 * [`UdpSocket::set_broadcast`]
4646 * [`UdpSocket::broadcast`]
4647 * [`UdpSocket::set_multicast_loop_v4`]
4648 * [`UdpSocket::multicast_loop_v4`]
4649 * [`UdpSocket::set_multicast_ttl_v4`]
4650 * [`UdpSocket::multicast_ttl_v4`]
4651 * [`UdpSocket::set_multicast_loop_v6`]
4652 * [`UdpSocket::multicast_loop_v6`]
4653 * [`UdpSocket::set_multicast_ttl_v6`]
4654 * [`UdpSocket::multicast_ttl_v6`]
4655 * [`UdpSocket::set_ttl`]
4656 * [`UdpSocket::ttl`]
4657 * [`UdpSocket::set_only_v6`]
4658 * [`UdpSocket::only_v6`]
4659 * [`UdpSocket::join_multicast_v4`]
4660 * [`UdpSocket::join_multicast_v6`]
4661 * [`UdpSocket::leave_multicast_v4`]
4662 * [`UdpSocket::leave_multicast_v6`]
4663 * [`UdpSocket::take_error`]
4664 * [`UdpSocket::connect`]
4665 * [`UdpSocket::send`]
4666 * [`UdpSocket::recv`]
4667 * [`UdpSocket::set_nonblocking`]
4672 * [`std::sync::Once` is poisoned if its initialization function
4674 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4675 * [Most types implement `fmt::Debug`][1.9db].
4676 * [The default buffer size used by `BufReader` and `BufWriter` was
4677 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4678 used by other languages.
4679 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4680 `Duration` additionally implements `*=` and `/=`][1.9ta].
4681 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4682 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4683 * [`Chain` implements `BufRead`][1.9ch].
4684 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4689 * [Cargo can now run concurrently][1.9cc].
4690 * [Top-level overrides allow specific revisions of crates to be
4691 overridden through the entire crate graph][1.9ct]. This is intended
4692 to make upgrades easier for large projects, by allowing crates to be
4693 forked temporarily until they've been upgraded and republished.
4694 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4695 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4696 on the commandline][1.9cf]. `rustc` arguments can also be specified
4697 in the `build.rustflags` configuration key.
4702 * [The time complexity of comparing variables for equivalence during type
4703 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4704 to major compilation time improvement in some scenarios.
4705 * [`ToString` is specialized for `str`, giving it the same performance
4706 as `to_owned`][1.9ts].
4707 * [Spawning processes with `Command::output` no longer creates extra
4709 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4710 for C-like enums][1.9cl].
4715 * [Passing the `--quiet` flag to a test runner will produce
4716 much-abbreviated output][1.9q].
4717 * The Rust Project now publishes std binaries for the
4718 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4719 `i586-pc-windows-msvc` targets.
4724 * [`std::sync::Once` is poisoned if its initialization function
4726 * [It is illegal to define methods with the same name in overlapping
4727 inherent `impl` blocks][1.9sn].
4728 * [`fn` item types are zero sized, and each `fn` names a unique
4729 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4730 `transmute` on a `fn` type will generate a warning for a few cycles,
4731 then will be converted to an error.
4732 * [Improvements to const evaluation may trigger new errors when integer
4733 literals are out of range][1.9ce].
4736 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4737 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4738 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4739 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4740 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4741 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4742 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4743 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4744 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4745 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4746 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4747 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4748 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4749 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4750 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4751 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4752 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4753 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4754 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4755 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4756 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4757 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4758 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4759 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4760 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4761 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4762 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4763 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4764 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4765 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
4766 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
4767 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
4768 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
4769 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
4770 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
4771 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
4772 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
4773 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
4774 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
4775 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
4776 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
4777 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
4778 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
4779 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
4780 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
4781 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
4782 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
4783 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
4784 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
4785 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
4786 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
4787 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
4788 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
4789 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
4790 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
4791 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
4792 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
4793 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
4794 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
4795 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
4796 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4797 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4798 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4799 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4800 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4801 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4802 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
4803 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4804 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
4805 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4806 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4807 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4808 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4809 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4810 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
4811 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
4812 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
4813 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
4814 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
4815 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
4816 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
4817 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
4818 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
4819 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
4820 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
4821 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
4822 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
4823 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
4824 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
4825 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
4826 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
4827 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
4828 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
4829 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
4830 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
4831 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
4832 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
4833 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
4834 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
4835 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
4836 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
4837 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
4838 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
4839 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
4840 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
4841 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
4842 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
4843 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
4844 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
4845 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
4848 Version 1.8.0 (2016-04-14)
4849 ==========================
4854 * Rust supports overloading of compound assignment statements like
4855 `+=` by implementing the [`AddAssign`], [`SubAssign`],
4856 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
4857 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
4859 * Empty structs can be defined with braces, as in `struct Foo { }`, in
4860 addition to the non-braced form, `struct Foo;`. [RFC 218].
4866 * [`str::encode_utf16`][] (renamed from `utf16_units`)
4867 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
4870 * [`ptr::drop_in_place`]
4872 * [`time::SystemTime`]
4874 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
4875 * [`Instant::elapsed`]
4876 * [`SystemTime::now`]
4877 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
4878 * [`SystemTime::elapsed`]
4879 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
4880 * [`SystemTimeError`]
4881 * [`SystemTimeError::duration`]
4882 * Various impls for `SystemTimeError`
4884 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
4885 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
4886 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
4887 * [The `write!` and `writeln!` macros correctly emit errors if any of
4888 their arguments can't be formatted][1.8w].
4889 * [Various I/O functions support large files on 32-bit Linux][1.8l].
4890 * [The Unix-specific `raw` modules, which contain a number of
4891 redefined C types are deprecated][1.8r], including `os::raw::unix`,
4892 `os::raw::macos`, and `os::raw::linux`. These modules defined types
4893 such as `ino_t` and `dev_t`. The inconsistency of these definitions
4894 across platforms was making it difficult to implement `std`
4895 correctly. Those that need these definitions should use the `libc`
4897 * The Unix-specific `MetadataExt` traits, including
4898 `os::unix::fs::MetadataExt`, which expose values such as inode
4899 numbers [no longer return platform-specific types][1.8r], but
4900 instead return widened integers. [RFC 1415].
4901 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
4902 * [Atomic loads and stores are not volatile][1.8a].
4903 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
4908 * [Inlining hash functions lead to a 3% compile-time improvement in
4909 some workloads][1.8h].
4910 * When using jemalloc, its symbols are [unprefixed so that it
4911 overrides the libc malloc implementation][1.8h]. This means that for
4912 rustc, LLVM is now using jemalloc, which results in a 6%
4913 compile-time improvement on a specific workload.
4914 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
4919 * [32-bit MSVC builds finally implement unwinding][1.8ms].
4920 i686-pc-windows-msvc is now considered a tier-1 platform.
4921 * [The `--print targets` flag prints a list of supported targets][1.8t].
4922 * [The `--print cfg` flag prints the `cfg`s defined for the current
4924 * [`rustc` can be built with an new Cargo-based build system, written
4925 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
4926 build system. To enable it configure with `configure --rustbuild`.
4927 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
4928 variants while also indicating the total number of missing variants
4929 if more than 3][1.8m].
4930 * [Executable stacks are disabled on Linux and BSD][1.8nx].
4931 * The Rust Project now publishes binary releases of the standard
4932 library for a number of tier-2 targets:
4933 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
4934 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
4935 `x86_64-rumprun-netbsd`. These can be installed with
4936 tools such as [multirust][1.8mr].
4941 * [`cargo init` creates a new Cargo project in the current
4942 directory][1.8ci]. It is otherwise like `cargo new`.
4943 * [Cargo has configuration keys for `-v` and
4944 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
4945 `[term]` section of `.cargo/config`.
4946 * [Configuration keys that evaluate to strings or integers can be set
4947 via environment variables][1.8ce]. For example the `build.jobs` key
4948 can be set via `CARGO_BUILD_JOBS`. Environment variables take
4949 precedence over config files.
4950 * [Target-specific dependencies support Rust `cfg` syntax for
4951 describing targets][1.8cfg] so that dependencies for multiple
4952 targets can be specified together. [RFC 1361].
4953 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
4954 `RUSTDOC` take precedence over the `build.target-dir`,
4955 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
4956 * [The child process tree is killed on Windows when Cargo is
4958 * [The `build.target` configuration value sets the target platform,
4959 like `--target`][1.8ct].
4964 * [Unstable compiler flags have been further restricted][1.8u]. Since
4965 1.0 `-Z` flags have been considered unstable, and other flags that
4966 were considered unstable additionally required passing `-Z
4967 unstable-options` to access. Unlike unstable language and library
4968 features though, these options have been accessible on the stable
4969 release channel. Going forward, *new unstable flags will not be
4970 available on the stable release channel*, and old unstable flags
4971 will warn about their usage. In the future, all unstable flags will
4972 be unavailable on the stable release channel.
4973 * [It is no longer possible to `match` on empty enum variants using
4974 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
4975 * The Unix-specific `MetadataExt` traits, including
4976 `os::unix::fs::MetadataExt`, which expose values such as inode
4977 numbers [no longer return platform-specific types][1.8r], but
4978 instead return widened integers. [RFC 1415].
4979 * [Modules sourced from the filesystem cannot appear within arbitrary
4980 blocks, but only within other modules][1.8mf].
4981 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
4982 * On Unix, [stack overflow triggers a runtime abort instead of a
4984 * [`Command::spawn` and its equivalents return an error if any of
4985 its command-line arguments contain interior `NUL`s][1.8n].
4986 * [Tuple and unit enum variants from other crates are in the type
4988 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
4989 type instead of `.a` files][1.8st]. Additionally, for the MSVC
4990 toolchain, `rustc` emits import libraries named `foo.dll.lib`
4991 instead of `foo.lib`.
4994 [1.8a]: https://github.com/rust-lang/rust/pull/30962
4995 [1.8b]: https://github.com/rust-lang/rust/pull/31123
4996 [1.8c]: https://github.com/rust-lang/rust/pull/31530
4997 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
4998 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
4999 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
5000 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
5001 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
5002 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
5003 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
5004 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
5005 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
5006 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
5007 [1.8h]: https://github.com/rust-lang/rust/pull/31460
5008 [1.8l]: https://github.com/rust-lang/rust/pull/31668
5009 [1.8m]: https://github.com/rust-lang/rust/pull/31020
5010 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
5011 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
5012 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
5013 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
5014 [1.8n]: https://github.com/rust-lang/rust/pull/31056
5015 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
5016 [1.8r]: https://github.com/rust-lang/rust/pull/31551
5017 [1.8so]: https://github.com/rust-lang/rust/pull/31333
5018 [1.8st]: https://github.com/rust-lang/rust/pull/29520
5019 [1.8t]: https://github.com/rust-lang/rust/pull/31358
5020 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
5021 [1.8u]: https://github.com/rust-lang/rust/pull/31793
5022 [1.8v]: https://github.com/rust-lang/rust/pull/31757
5023 [1.8w]: https://github.com/rust-lang/rust/pull/31904
5024 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
5025 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
5026 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
5027 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
5028 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
5029 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
5030 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
5031 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
5032 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
5033 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
5034 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
5035 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
5036 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
5037 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
5038 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
5039 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
5040 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
5041 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
5042 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
5043 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
5044 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
5045 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
5046 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
5047 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
5048 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
5049 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
5050 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
5051 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
5052 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
5053 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
5056 Version 1.7.0 (2016-03-03)
5057 ==========================
5064 * [`Path::strip_prefix`][] (renamed from relative_from)
5065 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
5067 * [`Ipv4Addr::is_loopback`]
5068 * [`Ipv4Addr::is_private`]
5069 * [`Ipv4Addr::is_link_local`]
5070 * [`Ipv4Addr::is_multicast`]
5071 * [`Ipv4Addr::is_broadcast`]
5072 * [`Ipv4Addr::is_documentation`]
5074 * [`Ipv6Addr::is_unspecified`]
5075 * [`Ipv6Addr::is_loopback`]
5076 * [`Ipv6Addr::is_multicast`]
5079 * [`Vec::as_mut_slice`]
5081 * [`String::as_str`]
5082 * [`String::as_mut_str`]
5084 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
5086 * `<[T]>::`[`sort_by_key`]
5087 * checked, saturated, and overflowing operations
5088 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
5089 * [`i32::saturating_mul`]
5090 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
5091 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
5092 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
5093 * [`u32::saturating_mul`]
5094 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
5095 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
5096 * and checked, saturated, and overflowing operations for other primitive types
5098 * [`ffi::IntoStringError`]
5099 * [`CString::into_string`]
5100 * [`CString::into_bytes`]
5101 * [`CString::into_bytes_with_nul`]
5102 * `From<CString> for Vec<u8>`
5104 * [`IntoStringError::into_cstring`]
5105 * [`IntoStringError::utf8_error`]
5106 * `Error for IntoStringError`
5108 * [`std::hash::BuildHasher`]
5109 * [`BuildHasher::Hasher`]
5110 * [`BuildHasher::build_hasher`]
5111 * [`std::hash::BuildHasherDefault`]
5112 * [`HashMap::with_hasher`]
5113 * [`HashMap::with_capacity_and_hasher`]
5114 * [`HashSet::with_hasher`]
5115 * [`HashSet::with_capacity_and_hasher`]
5116 * [`std::collections::hash_map::RandomState`]
5117 * [`RandomState::new`]
5118 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
5119 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
5120 from bytes is faster.
5121 * [The performance of `LineWriter` (and thus `io::stdout`) was
5122 improved by using `memchr` to search for newlines][1.7m].
5123 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
5124 `f64` variants were stabilized previously.
5125 * [`BTreeMap` was rewritten to use less memory and improve the performance
5126 of insertion and iteration, the latter by as much as 5x][1.7bm].
5127 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
5128 covariant over their contained type][1.7bt].
5129 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
5130 over their contained type][1.7ll].
5131 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
5133 * [`Any` is implemented for unsized types][1.7a].
5134 * [`Hash` is implemented for `Duration`][1.7h].
5139 * [When running tests with `--test`, rustdoc will pass `--cfg`
5140 arguments to the compiler][1.7dt].
5141 * [The compiler is built with RPATH information by default][1.7rpa].
5142 This means that it will be possible to run `rustc` when installed in
5143 unusual configurations without configuring the dynamic linker search
5145 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
5146 any RPATH entries (emitted with `-C rpath`) *not* take precedence
5147 over `LD_LIBRARY_PATH`.
5152 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
5153 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
5154 * [The `rerun-if-changed` build script directive no longer causes the
5155 build script to incorrectly run twice in certain scenarios][1.7rr].
5160 * Soundness fixes to the interactions between associated types and
5161 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
5162 code that violates the new rules. This is a significant change that
5163 is known to break existing code, so it has emitted warnings for the
5164 new error cases since 1.4 to give crate authors time to adapt. The
5165 details of what is changing are subtle; read the RFC for more.
5166 * [Several bugs in the compiler's visibility calculations were
5167 fixed][1.7v]. Since this was found to break significant amounts of
5168 code, the new errors will be emitted as warnings for several release
5169 cycles, under the `private_in_public` lint.
5170 * Defaulted type parameters were accidentally accepted in positions
5171 that were not intended. In this release, [defaulted type parameters
5172 appearing outside of type definitions will generate a
5173 warning][1.7d], which will become an error in future releases.
5174 * [Parsing "." as a float results in an error instead of 0][1.7p].
5175 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
5176 * [Borrows of closure parameters may not outlive the closure][1.7bc].
5178 [1.7a]: https://github.com/rust-lang/rust/pull/30928
5179 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
5180 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
5181 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
5182 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
5183 [1.7d]: https://github.com/rust-lang/rust/pull/30724
5184 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
5185 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
5186 [1.7f]: https://github.com/rust-lang/rust/pull/30672
5187 [1.7h]: https://github.com/rust-lang/rust/pull/30818
5188 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
5189 [1.7m]: https://github.com/rust-lang/rust/pull/30381
5190 [1.7p]: https://github.com/rust-lang/rust/pull/30681
5191 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
5192 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
5193 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
5194 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
5195 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
5196 [1.7v]: https://github.com/rust-lang/rust/pull/29973
5197 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5198 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5199 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
5200 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
5201 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
5202 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
5203 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
5204 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
5205 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
5206 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
5207 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
5208 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
5209 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
5210 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
5211 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
5212 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
5213 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
5214 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
5215 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
5216 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
5217 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
5218 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
5219 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
5220 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
5221 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
5222 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
5223 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
5224 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
5225 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
5226 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
5227 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
5228 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
5229 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
5230 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
5231 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
5232 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
5233 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
5234 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
5235 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
5236 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
5237 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
5238 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
5239 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
5240 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
5241 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
5242 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
5243 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
5244 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5245 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
5246 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5247 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
5248 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
5249 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
5250 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
5251 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
5252 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
5253 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
5254 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
5255 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
5256 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
5259 Version 1.6.0 (2016-01-21)
5260 ==========================
5265 * The `#![no_std]` attribute causes a crate to not be linked to the
5266 standard library, but only the [core library][1.6co], as described
5267 in [RFC 1184]. The core library defines common types and traits but
5268 has no platform dependencies whatsoever, and is the basis for Rust
5269 software in environments that cannot support a full port of the
5270 standard library, such as operating systems. Most of the core
5271 library is now stable.
5277 [`Read::read_exact`],
5278 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
5279 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
5280 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
5281 [`os::unix::fs::DirBuilderExt`],
5282 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
5283 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
5284 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
5285 [`collections::hash_map::Drain`],
5286 [`collections::hash_map::HashMap::drain`],
5287 [`collections::hash_set::Drain`],
5288 [`collections::hash_set::HashSet::drain`],
5289 [`collections::binary_heap::Drain`],
5290 [`collections::binary_heap::BinaryHeap::drain`],
5291 [`Vec::extend_from_slice`][] (renamed from `push_all`),
5292 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
5293 [`RwLock::into_inner`],
5294 [`Iterator::min_by_key`][] (renamed from `min_by`),
5295 [`Iterator::max_by_key`][] (renamed from `max_by`).
5296 * The [core library][1.6co] is stable, as are most of its APIs.
5297 * [The `assert_eq!` macro supports arguments that don't implement
5298 `Sized`][1.6ae], such as arrays. In this way it behaves more like
5300 * Several timer functions that take duration in milliseconds [are
5301 deprecated in favor of those that take `Duration`][1.6ms]. These
5302 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
5303 `thread::park_timeout_ms`.
5304 * The algorithm by which `Vec` reserves additional elements was
5305 [tweaked to not allocate excessive space][1.6a] while still growing
5307 * `From` conversions are [implemented from integers to floats][1.6f]
5308 in cases where the conversion is lossless. Thus they are not
5309 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
5310 or `f64`. They are also not implemented for `isize` and `usize`
5311 because the implementations would be platform-specific. `From` is
5312 also implemented from `f32` to `f64`.
5313 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
5314 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
5315 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
5316 * [`BinaryHeap` was refactored][1.6bh] for modest performance
5318 * Sorting slices that are already sorted [is 50% faster in some
5324 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
5325 * Cargo build scripts can specify their dependencies by emitting the
5326 [`rerun-if-changed`][1.6rr] key.
5327 * crates.io will reject publication of crates with dependencies that
5328 have a wildcard version constraint. Crates with wildcard
5329 dependencies were seen to cause a variety of problems, as described
5330 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
5332 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
5333 release folder. A variety of artifacts that Cargo failed to clean
5334 are now correctly deleted.
5339 * The `unreachable_code` lint [warns when a function call's argument
5341 * The parser indicates [failures that may be caused by
5342 confusingly-similar Unicode characters][1.6uc]
5343 * Certain macro errors [are reported at definition time][1.6m], not
5349 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
5350 environment variable when locating crates. This was a pre-cargo
5351 feature for integrating with the package manager that was
5352 accidentally never removed.
5353 * [A number of bugs were fixed in the privacy checker][1.6p] that
5354 could cause previously-accepted code to break.
5355 * [Modules and unit/tuple structs may not share the same name][1.6ts].
5356 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
5357 struct pattern syntax (`Foo(..)`) can no longer be used to match
5358 unit structs. This is a warning now, but will become an error in
5359 future releases. Patterns that share the same name as a const are
5361 * A bug was fixed that causes [rustc not to apply default type
5362 parameters][1.6xc] when resolving certain method implementations of
5363 traits defined in other crates.
5365 [1.6a]: https://github.com/rust-lang/rust/pull/29454
5366 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
5367 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
5368 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
5369 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
5370 [1.6co]: http://doc.rust-lang.org/core/index.html
5371 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
5372 [1.6f]: https://github.com/rust-lang/rust/pull/29129
5373 [1.6m]: https://github.com/rust-lang/rust/pull/29828
5374 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
5375 [1.6p]: https://github.com/rust-lang/rust/pull/29726
5376 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
5377 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
5378 [1.6s]: https://github.com/rust-lang/rust/pull/29675
5379 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
5380 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
5381 [1.6us]: https://github.com/rust-lang/rust/pull/29383
5382 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
5383 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
5384 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5385 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
5386 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
5387 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
5388 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
5389 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
5390 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
5391 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
5392 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
5393 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
5394 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
5395 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
5396 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
5397 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
5398 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
5399 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
5400 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
5401 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
5402 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
5403 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
5404 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
5405 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
5406 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
5407 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
5408 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
5409 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
5410 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
5411 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
5414 Version 1.5.0 (2015-12-10)
5415 ==========================
5417 * ~700 changes, numerous bugfixes
5423 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
5424 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
5425 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
5426 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
5427 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
5428 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
5429 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
5430 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
5431 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
5432 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
5433 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
5434 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
5435 [`Path::read_link`], [`Path::symlink_metadata`],
5436 [`Utf8Error::valid_up_to`], [`Vec::resize`],
5437 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
5438 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
5439 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
5440 [`slice::split_first_mut`], [`slice::split_first`],
5441 [`slice::split_last_mut`], [`slice::split_last`],
5442 [`char::from_u32_unchecked`], [`fs::canonicalize`],
5443 [`str::MatchIndices`], [`str::RMatchIndices`],
5444 [`str::match_indices`], [`str::rmatch_indices`],
5445 [`str::slice_mut_unchecked`], [`string::ParseError`].
5446 * Rust applications hosted on crates.io can be installed locally to
5447 `~/.cargo/bin` with the [`cargo install`] command. Among other
5448 things this makes it easier to augment Cargo with new subcommands:
5449 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
5450 invoked as `cargo foo`.
5451 * Crates with wildcard (`*`) dependencies will [emit warnings when
5452 published][1.5w]. In 1.6 it will no longer be possible to publish
5453 crates with wildcard dependencies.
5458 * The rules determining when a particular lifetime must outlive
5459 a particular value (known as '[dropck]') have been [modified
5460 to not rely on parametricity][1.5p].
5461 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
5462 and `Arc`][1.5a]. Because these smart pointer types implement
5463 `Deref`, this causes breakage in cases where the interior type
5464 contains methods of the same name.
5465 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
5466 that they could drop their content. Soundness fix.
5467 * All method invocations are [properly checked][1.5wf1] for
5468 [well-formedness][1.5wf2]. Soundness fix.
5469 * Traits whose supertraits contain `Self` are [not object
5470 safe][1.5o]. Soundness fix.
5471 * Target specifications support a [`no_default_libraries`][1.5nd]
5472 setting that controls whether `-nodefaultlibs` is passed to the
5473 linker, and in turn the `is_like_windows` setting no longer affects
5474 the `-nodefaultlibs` flag.
5475 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
5476 * The `#[inline]` and `#[repr]` attributes [can only appear
5477 in valid locations][1.5at].
5478 * Native libraries linked from the local crate are [passed to
5479 the linker before native libraries from upstream crates][1.5nl].
5480 * Two rarely-used attributes, `#[no_debug]` and
5481 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
5482 * Negation of unsigned integers, which has been a warning for
5483 several releases, [is now behind a feature gate and will
5484 generate errors][1.5nu].
5485 * The parser accidentally accepted visibility modifiers on
5486 enum variants, a bug [which has been fixed][1.5ev].
5487 * [A bug was fixed that allowed `use` statements to import unstable
5493 * When evaluating expressions at compile-time that are not
5494 compile-time constants (const-evaluating expressions in non-const
5495 contexts), incorrect code such as overlong bitshifts and arithmetic
5496 overflow will [generate a warning instead of an error][1.5ce],
5497 delaying the error until runtime. This will allow the
5498 const-evaluator to be expanded in the future backwards-compatibly.
5499 * The `improper_ctypes` lint [no longer warns about using `isize` and
5500 `usize` in FFI][1.5ict].
5505 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
5507 * `Default` is [implemented for mutable slices][1.5d].
5508 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
5509 * There are now `From` conversions [between floating point
5510 types][1.5f] where the conversions are lossless.
5511 * There are now `From` conversions [between integer types][1.5i] where
5512 the conversions are lossless.
5513 * [`fs::Metadata` implements `Clone`][1.5fs].
5514 * The `parse` method [accepts a leading "+" when parsing
5516 * [`AsMut` is implemented for `Vec`][1.5am].
5517 * The `clone_from` implementations for `String` and `BinaryHeap` [have
5518 been optimized][1.5cf] and no longer rely on the default impl.
5519 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
5520 `unsafe extern "C"` function types now [implement `Clone`,
5521 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
5522 `fmt::Debug` for up to 12 arguments][1.5fp].
5523 * [Dropping `Vec`s is much faster in unoptimized builds when the
5524 element types don't implement `Drop`][1.5dv].
5525 * A bug that caused in incorrect behavior when [combining `VecDeque`
5526 with zero-sized types][1.5vdz] was resolved.
5527 * [`PartialOrd` for slices is faster][1.5po].
5532 * [Crate metadata size was reduced by 20%][1.5md].
5533 * [Improvements to code generation reduced the size of libcore by 3.3
5534 MB and rustc's memory usage by 18MB][1.5m].
5535 * [Improvements to deref translation increased performance in
5536 unoptimized builds][1.5dr].
5537 * Various errors in trait resolution [are deduplicated to only be
5538 reported once][1.5te].
5539 * Rust has preliminary [support for rumprun kernels][1.5rr].
5540 * Rust has preliminary [support for NetBSD on amd64][1.5na].
5542 [1.5use]: https://github.com/rust-lang/rust/pull/28364
5543 [1.5po]: https://github.com/rust-lang/rust/pull/28436
5544 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
5545 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
5546 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
5547 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
5548 [1.5md]: https://github.com/rust-lang/rust/pull/28521
5549 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
5550 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
5551 [1.5na]: https://github.com/rust-lang/rust/pull/28543
5552 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
5553 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
5554 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
5555 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
5556 [1.5te]: https://github.com/rust-lang/rust/pull/28645
5557 [1.5at]: https://github.com/rust-lang/rust/pull/28650
5558 [1.5am]: https://github.com/rust-lang/rust/pull/28663
5559 [1.5m]: https://github.com/rust-lang/rust/pull/28778
5560 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
5561 [1.5a]: https://github.com/rust-lang/rust/pull/28811
5562 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
5563 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
5564 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
5565 [1.5i]: https://github.com/rust-lang/rust/pull/28921
5566 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
5567 [1.5f]: https://github.com/rust-lang/rust/pull/29129
5568 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
5569 [1.5s]: https://github.com/rust-lang/rust/pull/29190
5570 [1.5d]: https://github.com/rust-lang/rust/pull/29245
5571 [1.5o]: https://github.com/rust-lang/rust/pull/29259
5572 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
5573 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5574 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
5575 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
5576 [1.5c]: https://github.com/rust-lang/rust/pull/29110
5577 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5578 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
5579 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
5580 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
5581 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
5582 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
5583 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
5584 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
5585 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
5586 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
5587 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
5588 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
5589 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
5590 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
5591 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
5592 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
5593 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
5594 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
5595 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
5596 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
5597 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
5598 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
5599 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
5600 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
5601 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
5602 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
5603 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
5604 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
5605 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
5606 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
5607 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
5608 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
5609 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
5610 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
5611 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
5612 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
5613 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
5614 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
5615 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
5616 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
5617 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
5618 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
5619 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
5620 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
5621 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
5622 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
5623 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
5624 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
5625 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
5626 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
5627 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
5628 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
5629 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
5630 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
5632 Version 1.4.0 (2015-10-29)
5633 ==========================
5635 * ~1200 changes, numerous bugfixes
5640 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
5641 GNU) are now supported and recommended for use.
5646 * [Several changes have been made to fix type soundness and improve
5647 the behavior of associated types][sound]. See [RFC 1214]. Although
5648 we have mostly introduced these changes as warnings this release, to
5649 become errors next release, there are still some scenarios that will
5650 see immediate breakage.
5651 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
5652 line breaks in addition to `\n`][crlf].
5653 * [Loans of `'static` lifetime extend to the end of a function][stat].
5654 * [`str::parse` no longer introduces avoidable rounding error when
5655 parsing floating point numbers. Together with earlier changes to
5656 float formatting/output, "round trips" like f.to_string().parse()
5657 now preserve the value of f exactly. Additionally, leading plus
5658 signs are now accepted][fp3].
5664 * `use` statements that import multiple items [can now rename
5665 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
5666 * [Binops work correctly on fat pointers][binfat].
5667 * `pub extern crate`, which does not behave as expected, [issues a
5668 warning][pec] until a better solution is found.
5673 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5674 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5675 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5676 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5677 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5678 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5679 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5680 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5681 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5682 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5683 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5684 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5685 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5686 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5687 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5688 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5689 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5690 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5692 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5693 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5694 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5695 `f64::from_str_radix`.
5696 * [Reverse-searching strings is faster with the 'two-way'
5698 * [`std::io::copy` allows `?Sized` arguments][cc].
5699 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5700 [override `count`, `nth` and `last` with an O(1)
5701 implementation][it].
5702 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5703 * [`IntoRawFd` has been added to the Unix-specific prelude,
5704 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5706 * [`Extend<String>` and `FromIterator<String` are both implemented for
5708 * [`IntoIterator` is implemented for references to `Option` and
5710 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5711 Copy`][ext] as part of [RFC 839]. This will cause type inference
5712 breakage in rare situations.
5713 * [`BinaryHeap` implements `Debug`][bh2].
5714 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5716 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5717 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5718 * [String comparison is faster][faststr].
5719 * `&mut T` where `T: std::fmt::Write` [also implements
5720 `std::fmt::Write`][mutw].
5721 * [A stable regression in `VecDeque::push_back` and other
5722 capacity-altering methods that caused panics for zero-sized types
5724 * [Function pointers implement traits for up to 12 parameters][fp2].
5729 * The compiler [no longer uses the 'morestack' feature to prevent
5730 stack overflow][mm]. Instead it uses guard pages and stack
5731 probes (though stack probes are not yet implemented on any platform
5733 * [The compiler matches traits faster when projections are involved][p].
5734 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5736 * [Cargo now displays useful information about what its doing during
5737 `cargo update`][cu].
5739 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5740 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5741 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5742 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5743 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5744 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5745 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5746 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5747 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5748 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5749 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5750 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5751 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5752 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5753 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5754 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5755 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5756 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5757 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5758 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5759 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5760 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5761 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5762 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5763 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5764 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5765 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
5766 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
5767 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
5768 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
5769 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
5770 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
5771 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
5772 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
5773 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
5774 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
5775 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
5776 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
5777 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
5778 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
5779 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
5780 [bh2]: https://github.com/rust-lang/rust/pull/28156
5781 [binfat]: https://github.com/rust-lang/rust/pull/28270
5782 [bm]: https://github.com/rust-lang/rust/pull/28197
5783 [cc]: https://github.com/rust-lang/rust/pull/27531
5784 [crlf]: https://github.com/rust-lang/rust/pull/28034
5785 [cu]: https://github.com/rust-lang/cargo/pull/1931
5786 [d]: https://github.com/rust-lang/rust/pull/27825
5787 [dep]: https://github.com/rust-lang/rust/pull/28339
5788 [es]: https://github.com/rust-lang/rust/pull/27956
5789 [ext]: https://github.com/rust-lang/rust/pull/28094
5790 [faststr]: https://github.com/rust-lang/rust/pull/28338
5791 [ffi]: https://github.com/rust-lang/rust/pull/28779
5792 [fp]: https://github.com/rust-lang/rust/pull/28268
5793 [fp2]: https://github.com/rust-lang/rust/pull/28560
5794 [fp3]: https://github.com/rust-lang/rust/pull/27307
5795 [i]: https://github.com/rust-lang/rust/pull/27451
5796 [into2]: https://github.com/rust-lang/rust/pull/28039
5797 [it]: https://github.com/rust-lang/rust/pull/27652
5798 [mm]: https://github.com/rust-lang/rust/pull/27338
5799 [mutw]: https://github.com/rust-lang/rust/pull/28368
5800 [sound]: https://github.com/rust-lang/rust/pull/27641
5801 [p]: https://github.com/rust-lang/rust/pull/27866
5802 [pec]: https://github.com/rust-lang/rust/pull/28486
5803 [pr]: https://github.com/rust-lang/rust/pull/27896
5804 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5805 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5806 [s]: https://github.com/rust-lang/rust/pull/27474
5807 [stab]: https://github.com/rust-lang/rust/pull/28339
5808 [stat]: https://github.com/rust-lang/rust/pull/28321
5809 [vd]: https://github.com/rust-lang/rust/pull/28494
5811 Version 1.3.0 (2015-09-17)
5812 ==============================
5814 * ~900 changes, numerous bugfixes
5819 * The [new object lifetime defaults][nold] have been [turned
5820 on][nold2] after a cycle of warnings about the change. Now types
5821 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
5822 being interpreted as `&'a Box<Trait+'a>` to `&'a
5823 Box<Trait+'static>`.
5824 * [The Rustonomicon][nom] is a new book in the official documentation
5825 that dives into writing unsafe Rust.
5826 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
5827 timekeeping is employed by other std APIs, as well as out-of-tree
5833 * The [new object lifetime defaults][nold] have been [turned
5834 on][nold2] after a cycle of warnings about the change.
5835 * There is a known [regression][lr] in how object lifetime elision is
5836 interpreted, the proper solution for which is undetermined.
5837 * The `#[prelude_import]` attribute, an internal implementation
5838 detail, was accidentally stabilized previously. [It has been put
5839 behind the `prelude_import` feature gate][pi]. This change is
5840 believed to break no existing code.
5841 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5842 [more sane for dynamically sized types][dst3]. Code that relied on
5843 the previous behavior is thought to be broken.
5844 * The `dropck` rules, which checks that destructors can't access
5845 destroyed values, [have been updated][dropck] to match the
5846 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
5847 cause some previously-compiling code to no longer build.
5852 * The [new object lifetime defaults][nold] have been [turned
5853 on][nold2] after a cycle of warnings about the change.
5854 * Semicolons may [now follow types and paths in
5855 macros](https://github.com/rust-lang/rust/pull/27000).
5856 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5857 [more sane for dynamically sized types][dst3]. Code that relied on
5858 the previous behavior is not known to exist, and suspected to be
5860 * `'static` variables [may now be recursive][st].
5861 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
5862 implementations correctly.
5863 * The `dropck` rules, which checks that destructors can't access
5864 destroyed values, [have been updated][dropck] to match the
5870 * The [`Duration`] API, [has been stabilized][ds], as well as the
5871 `std::time` module, which presently contains only `Duration`.
5872 * `Box<str>` and `Box<[T]>` both implement `Clone`.
5873 * The owned C string, [`CString`], implements [`Borrow`] and the
5874 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
5875 these allow C strings to be borrowed and cloned in generic code.
5876 * [`CStr`] implements [`Debug`].
5877 * [`AtomicPtr`] implements [`Debug`].
5878 * [`Error`] trait objects [can be downcast to their concrete types][e]
5879 in many common configurations, using the [`is`], [`downcast`],
5880 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
5882 * Searching for substrings now [employs the two-way algorithm][search]
5883 instead of doing a naive search. This gives major speedups to a
5884 number of methods, including [`contains`][sc], [`find`][sf],
5885 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
5886 [`ends_with`][sew] are also faster.
5887 * The performance of `PartialEq` for slices is [much faster][ps].
5888 * The [`Hash`] trait offers the default method, [`hash_slice`], which
5889 is overridden and optimized by the implementations for scalars.
5890 * The [`Hasher`] trait now has a number of specialized `write_*`
5891 methods for primitive types, for efficiency.
5892 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
5893 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
5894 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
5895 of [`std::error::Error::cause`][iec] also delegates to the inner
5897 * [`process::Child`][pc] gained the [`id`] method, which returns a
5898 `u32` representing the platform-specific process identifier.
5899 * The [`connect`] method on slices is deprecated, replaced by the new
5900 [`join`] method (note that both of these are on the *unstable*
5901 [`SliceConcatExt`] trait, but through the magic of the prelude are
5902 available to stable code anyway).
5903 * The [`Div`] operator is implemented for [`Wrapping`] types.
5904 * [`DerefMut` is implemented for `String`][dms].
5905 * Performance of SipHash (the default hasher for `HashMap`) is
5906 [better for long data][sh].
5907 * [`AtomicPtr`] implements [`Send`].
5908 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
5909 are now [specialized to use uninitialized buffers for increased
5911 * Lifetime parameters of foreign functions [are now resolved
5917 * Rust can now, with some coercion, [produce programs that run on
5918 Windows XP][xp], though XP is not considered a supported platform.
5919 * Porting Rust on Windows from the GNU toolchain to MSVC continues
5920 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
5921 recommended for use in 1.3, though should be fully-functional
5922 in the [64-bit 1.4 beta][b14].
5923 * On Fedora-based systems installation will [properly configure the
5924 dynamic linker][fl].
5925 * The compiler gained many new extended error descriptions, which can
5926 be accessed with the `--explain` flag.
5927 * The `dropck` pass, which checks that destructors can't access
5928 destroyed values, [has been rewritten][dropck]. This fixes some
5929 soundness holes, and as such will cause some previously-compiling
5930 code to no longer build.
5931 * `rustc` now uses [LLVM to write archive files where possible][ar].
5932 Eventually this will eliminate the compiler's dependency on the ar
5934 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
5935 supported FreeBSD on x86_64).
5936 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
5937 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
5939 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
5940 will kill the process instead of leaking][nlp].
5942 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
5943 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
5944 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
5945 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
5946 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
5947 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5948 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5949 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
5950 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
5951 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
5952 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
5953 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
5954 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
5955 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5956 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
5957 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
5958 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
5959 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
5960 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5961 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
5962 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
5963 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
5964 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
5965 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5966 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
5967 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
5968 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
5969 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
5970 [ar]: https://github.com/rust-lang/rust/pull/26926
5971 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
5972 [dms]: https://github.com/rust-lang/rust/pull/26241
5973 [dropck]: https://github.com/rust-lang/rust/pull/27261
5974 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5975 [ds]: https://github.com/rust-lang/rust/pull/26818
5976 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
5977 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
5978 [dst3]: https://github.com/rust-lang/rust/pull/27351
5979 [e]: https://github.com/rust-lang/rust/pull/24793
5980 [f]: https://github.com/rust-lang/rust/pull/26588
5981 [fb]: https://github.com/rust-lang/rust/pull/26959
5982 [fl]: https://github.com/rust-lang/rust-installer/pull/41
5983 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5984 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
5985 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
5986 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
5987 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
5988 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
5989 [lic]: https://github.com/rust-lang/rust/pull/26583
5990 [lnu]: https://github.com/rust-lang/rust/pull/27026
5991 [lr]: https://github.com/rust-lang/rust/issues/27248
5992 [lum]: https://github.com/rust-lang/rust/pull/26378
5993 [lur]: https://github.com/rust-lang/rust/pull/26783
5994 [nlp]: https://github.com/rust-lang/rust/pull/27176
5995 [nold2]: https://github.com/rust-lang/rust/pull/27045
5996 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
5997 [nom]: http://doc.rust-lang.org/nightly/nomicon/
5998 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
5999 [pi]: https://github.com/rust-lang/rust/pull/26699
6000 [ps]: https://github.com/rust-lang/rust/pull/26884
6001 [rte]: https://github.com/rust-lang/rust/pull/26950
6002 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
6003 [search]: https://github.com/rust-lang/rust/pull/26327
6004 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
6005 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
6006 [sh]: https://github.com/rust-lang/rust/pull/27280
6007 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
6008 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
6009 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
6010 [st]: https://github.com/rust-lang/rust/pull/26630
6011 [win1]: https://github.com/rust-lang/rust/pull/26569
6012 [win2]: https://github.com/rust-lang/rust/pull/26741
6013 [win3]: https://github.com/rust-lang/rust/pull/26741
6014 [win4]: https://github.com/rust-lang/rust/pull/27210
6015 [xp]: https://github.com/rust-lang/rust/pull/26569
6017 Version 1.2.0 (2015-08-07)
6018 ==========================
6020 * ~1200 changes, numerous bugfixes
6025 * [Dynamically-sized-type coercions][dst] allow smart pointer types
6026 like `Rc` to contain types without a fixed size, arrays and trait
6027 objects, finally enabling use of `Rc<[T]>` and completing the
6028 implementation of DST.
6029 * [Parallel codegen][parcodegen] is now working again, which can
6030 substantially speed up large builds in debug mode; It also gets
6031 another ~33% speedup when bootstrapping on a 4 core machine (using 8
6032 jobs). It's not enabled by default, but will be "in the near
6033 future". It can be activated with the `-C codegen-units=N` flag to
6035 * This is the first release with [experimental support for linking
6036 with the MSVC linker and lib C on Windows (instead of using the GNU
6037 variants via MinGW)][win]. It is yet recommended only for the most
6038 intrepid Rustaceans.
6039 * Benchmark compilations are showing a 30% improvement in
6040 bootstrapping over 1.1.
6045 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
6046 unicode case mapping, which is a previously-planned change in
6047 behavior and considered a bugfix.
6048 * [`mem::align_of`] now specifies [the *minimum alignment* for
6049 T][align], which is usually the alignment programs are interested
6050 in, and the same value reported by clang's
6051 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
6053 * [The `#[packed]` attribute is no longer silently accepted by the
6054 compiler][packed]. This attribute did nothing and code that
6055 mentioned it likely did not work as intended.
6056 * Associated type defaults are [now behind the
6057 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
6058 defaults *did not work*, but could be mentioned syntactically. As
6059 such this breakage has minimal impact.
6064 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
6065 matching against dereferenceable values.
6070 * The [`Extend`] trait, which grows a collection from an iterator, is
6071 implemented over iterators of references, for `String`, `Vec`,
6072 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
6073 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
6074 * The [`iter::once`] function returns an iterator that yields a single
6075 element, and [`iter::empty`] returns an iterator that yields no
6077 * The [`matches`] and [`rmatches`] methods on `str` return iterators
6078 over substring matches.
6079 * [`Cell`] and [`RefCell`] both implement `Eq`.
6080 * A number of methods for wrapping arithmetic are added to the
6081 integral types, [`wrapping_div`], [`wrapping_rem`],
6082 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
6083 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
6084 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
6085 type.. It is illegal for the default arithmetic operations in Rust
6086 to overflow; the desire to wrap must be explicit.
6087 * The `{:#?}` formatting specifier [displays the alternate,
6088 pretty-printed][debugfmt] form of the `Debug` formatter. This
6089 feature was actually introduced prior to 1.0 with little
6091 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
6092 for writing data to formatted strings, similar to [`io::Write`].
6093 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
6094 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
6095 are used by code generators to emit implementations of [`Debug`].
6096 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
6097 methods that convert case, following Unicode case mapping.
6098 * It is now easier to handle poisoned locks. The [`PoisonError`]
6099 type, returned by failing lock operations, exposes `into_inner`,
6100 `get_ref`, and `get_mut`, which all give access to the inner lock
6101 guard, and allow the poisoned lock to continue to operate. The
6102 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
6103 poisoned lock without attempting to take the lock.
6104 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
6105 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
6106 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
6107 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
6109 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
6115 * `rustc` employs smarter heuristics for guessing at [typos].
6116 * `rustc` emits more efficient code for [no-op conversions between
6117 unsafe pointers][nop].
6118 * Fat pointers are now [passed in pairs of immediate arguments][fat],
6119 resulting in faster compile times and smaller code.
6121 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
6122 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6123 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
6124 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
6125 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
6126 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
6127 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
6128 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
6129 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
6130 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
6131 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
6132 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
6133 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
6134 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
6135 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
6136 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
6137 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6138 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
6139 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
6140 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
6141 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
6142 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
6143 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
6144 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
6145 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
6146 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6147 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
6148 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
6149 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
6150 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
6151 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
6152 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
6153 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
6154 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6155 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6156 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
6157 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
6158 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
6159 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
6160 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
6161 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
6162 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6163 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
6164 [align]: https://github.com/rust-lang/rust/pull/25646
6165 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
6166 [typos]: https://github.com/rust-lang/rust/pull/26087
6167 [nop]: https://github.com/rust-lang/rust/pull/26336
6168 [fat]: https://github.com/rust-lang/rust/pull/26411
6169 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
6170 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
6171 [packed]: https://github.com/rust-lang/rust/pull/25541
6172 [ad]: https://github.com/rust-lang/rust/pull/27382
6173 [win]: https://github.com/rust-lang/rust/pull/25350
6175 Version 1.1.0 (2015-06-25)
6176 =========================
6178 * ~850 changes, numerous bugfixes
6183 * The [`std::fs` module has been expanded][fs] to expand the set of
6184 functionality exposed:
6185 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
6186 don't incur a syscall on some platforms.
6187 * A `symlink_metadata` function has been added.
6188 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
6189 access to all underlying information.
6190 * The compiler now contains extended explanations of many errors. When an error
6191 with an explanation occurs the compiler suggests using the `--explain` flag
6192 to read the explanation. Error explanations are also [available online][err-index].
6193 * Thanks to multiple [improvements][sk] to [type checking][pre], as
6194 well as other work, the time to bootstrap the compiler decreased by
6200 * The [`str::split_whitespace`] method splits a string on unicode
6201 whitespace boundaries.
6202 * On both Windows and Unix, new extension traits provide conversion of
6203 I/O types to and from the underlying system handles. On Unix, these
6204 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
6205 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
6206 `TcpListener`, and `UpdSocket`. Further implementations for
6207 `std::process` will be stabilized later.
6208 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
6209 Windows, symlinks can be created with
6210 `std::os::windows::symlink_dir` and
6211 `std::os::windows::symlink_file`.
6212 * The `mpsc::Receiver` type can now be converted into an iterator with
6213 `into_iter` on the [`IntoIterator`] trait.
6214 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
6215 implementation of the [`From`] trait.
6216 * The `Debug` implementation for `RangeFull` [creates output that is
6217 more consistent with other implementations][rf].
6218 * [`Debug` is implemented for `File`][file].
6219 * The `Default` implementation for `Arc` [no longer requires `Sync +
6221 * [The `Iterator` methods `count`, `nth`, and `last` have been
6222 overridden for slices to have O(1) performance instead of O(n)][si].
6223 * Incorrect handling of paths on Windows has been improved in both the
6224 compiler and the standard library.
6225 * [`AtomicPtr` gained a `Default` implementation][ap].
6226 * In accordance with Rust's policy on arithmetic overflow `abs` now
6227 [panics on overflow when debug assertions are enabled][abs].
6228 * The [`Cloned`] iterator, which was accidentally left unstable for
6229 1.0 [has been stabilized][c].
6230 * The [`Incoming`] iterator, which iterates over incoming TCP
6231 connections, and which was accidentally unnamable in 1.0, [is now
6232 properly exported][inc].
6233 * [`BinaryHeap`] no longer corrupts itself [when functions called by
6234 `sift_up` or `sift_down` panic][bh].
6235 * The [`split_off`] method of `LinkedList` [no longer corrupts
6236 the list in certain scenarios][ll].
6241 * Type checking performance [has improved notably][sk] with
6242 [multiple improvements][pre].
6243 * The compiler [suggests code changes][ch] for more errors.
6244 * rustc and it's build system have experimental support for [building
6245 toolchains against MUSL][m] instead of glibc on Linux.
6246 * The compiler defines the `target_env` cfg value, which is used for
6247 distinguishing toolchains that are otherwise for the same
6248 platform. Presently this is set to `gnu` for common GNU Linux
6249 targets and for MinGW targets, and `musl` for MUSL Linux targets.
6250 * The [`cargo rustc`][crc] command invokes a build with custom flags
6252 * [Android executables are always position independent][pie].
6253 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
6256 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
6257 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6258 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6259 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
6260 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
6261 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
6262 [rf]: https://github.com/rust-lang/rust/pull/24491
6263 [err-index]: https://doc.rust-lang.org/error-index.html
6264 [sk]: https://github.com/rust-lang/rust/pull/24615
6265 [pre]: https://github.com/rust-lang/rust/pull/25323
6266 [file]: https://github.com/rust-lang/rust/pull/24598
6267 [ch]: https://github.com/rust-lang/rust/pull/24683
6268 [arc]: https://github.com/rust-lang/rust/pull/24695
6269 [si]: https://github.com/rust-lang/rust/pull/24701
6270 [ap]: https://github.com/rust-lang/rust/pull/24834
6271 [m]: https://github.com/rust-lang/rust/pull/24777
6272 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
6273 [crc]: https://github.com/rust-lang/cargo/pull/1568
6274 [pie]: https://github.com/rust-lang/rust/pull/24953
6275 [abs]: https://github.com/rust-lang/rust/pull/25441
6276 [c]: https://github.com/rust-lang/rust/pull/25496
6277 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
6278 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
6279 [inc]: https://github.com/rust-lang/rust/pull/25522
6280 [bh]: https://github.com/rust-lang/rust/pull/25856
6281 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
6282 [ll]: https://github.com/rust-lang/rust/pull/26022
6283 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
6284 [drop]: https://github.com/rust-lang/rust/pull/24935
6286 Version 1.0.0 (2015-05-15)
6287 ========================
6289 * ~1500 changes, numerous bugfixes
6294 * The vast majority of the standard library is now `#[stable]`. It is
6295 no longer possible to use unstable features with a stable build of
6297 * Many popular crates on [crates.io] now work on the stable release
6299 * Arithmetic on basic integer types now [checks for overflow in debug
6305 * Several [restrictions have been added to trait coherence][coh] in
6306 order to make it easier for upstream authors to change traits
6307 without breaking downstream code.
6308 * Digits of binary and octal literals are [lexed more eagerly][lex] to
6309 improve error messages and macro behavior. For example, `0b1234` is
6310 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
6311 * Trait bounds [are always invariant][inv], eliminating the need for
6312 the `PhantomFn` and `MarkerTrait` lang items, which have been
6314 * ["-" is no longer a valid character in crate names][cr], the `extern crate
6315 "foo" as bar` syntax has been replaced with `extern crate foo as
6316 bar`, and Cargo now automatically translates "-" in *package* names
6317 to underscore for the crate name.
6318 * [Lifetime shadowing is an error][lt].
6319 * [`Send` no longer implies `'static`][send-rfc].
6320 * [UFCS now supports trait-less associated paths][moar-ufcs] like
6321 `MyType::default()`.
6322 * Primitive types [now have inherent methods][prim-inherent],
6323 obviating the need for extension traits like `SliceExt`.
6324 * Methods with `Self: Sized` in their `where` clause are [considered
6325 object-safe][self-sized], allowing many extension traits like
6326 `IteratorExt` to be merged into the traits they extended.
6327 * You can now [refer to associated types][assoc-where] whose
6328 corresponding trait bounds appear only in a `where` clause.
6329 * The final bits of [OIBIT landed][oibit-final], meaning that traits
6330 like `Send` and `Sync` are now library-defined.
6331 * A [Reflect trait][reflect] was introduced, which means that
6332 downcasting via the `Any` trait is effectively limited to concrete
6333 types. This helps retain the potentially-important "parametricity"
6334 property: generic code cannot behave differently for different type
6335 arguments except in minor ways.
6336 * The `unsafe_destructor` feature is now deprecated in favor of the
6337 [new `dropck`][dropck]. This change is a major reduction in unsafe
6343 * The `thread_local` module [has been renamed to `std::thread`][th].
6344 * The methods of `IteratorExt` [have been moved to the `Iterator`
6346 * Several traits that implement Rust's conventions for type
6347 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
6348 [centralized in the `std::convert` module][con].
6349 * The `FromError` trait [was removed in favor of `From`][fe].
6350 * The basic sleep function [has moved to
6351 `std::thread::sleep_ms`][slp].
6352 * The `splitn` function now takes an `n` parameter that represents the
6353 number of items yielded by the returned iterator [instead of the
6354 number of 'splits'][spl].
6355 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
6356 * [Derived implementations of `PartialOrd` now order enums according
6357 to their explicitly-assigned discriminants][po].
6358 * [Methods for searching strings are generic over `Pattern`s][pat],
6359 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
6361 * [In method resolution, object methods are resolved before inherent
6363 * [`String::from_str` has been deprecated in favor of the `From` impl,
6364 `String::from`][sf].
6365 * [`io::Error` implements `Sync`][ios].
6366 * [The `words` method on `&str` has been replaced with
6367 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
6369 * The new path and IO modules are complete and `#[stable]`. This
6370 was the major library focus for this cycle.
6371 * The path API was [revised][path-normalize] to normalize `.`,
6372 adjusting the tradeoffs in favor of the most common usage.
6373 * A large number of remaining APIs in `std` were also stabilized
6374 during this cycle; about 75% of the non-deprecated API surface
6376 * The new [string pattern API][string-pattern] landed, which makes
6377 the string slice API much more internally consistent and flexible.
6378 * A new set of [generic conversion traits][conversion] replaced
6379 many existing ad hoc traits.
6380 * Generic numeric traits were [completely removed][num-traits]. This
6381 was made possible thanks to inherent methods for primitive types,
6382 and the removal gives maximal flexibility for designing a numeric
6383 hierarchy in the future.
6384 * The `Fn` traits are now related via [inheritance][fn-inherit]
6385 and provide ergonomic [blanket implementations][fn-blanket].
6386 * The `Index` and `IndexMut` traits were changed to
6387 [take the index by value][index-value], enabling code like
6388 `hash_map["string"]` to work.
6389 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
6390 `Copy` data is known to be `Clone` as well.
6395 * Many errors now have extended explanations that can be accessed with
6396 the `--explain` flag to `rustc`.
6397 * Many new examples have been added to the standard library
6399 * rustdoc has received a number of improvements focused on completion
6401 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
6402 * Much headway was made on ecosystem-wide CI, making it possible
6403 to [compare builds for breakage][ci-compare].
6406 [crates.io]: http://crates.io
6407 [clo]: https://github.com/rust-lang/rust/pull/24034
6408 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
6409 [con]: https://github.com/rust-lang/rust/pull/23875
6410 [cr]: https://github.com/rust-lang/rust/pull/23419
6411 [fe]: https://github.com/rust-lang/rust/pull/23879
6412 [ie]: https://github.com/rust-lang/rust/pull/23300
6413 [inv]: https://github.com/rust-lang/rust/pull/23938
6414 [ios]: https://github.com/rust-lang/rust/pull/24133
6415 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
6416 [lt]: https://github.com/rust-lang/rust/pull/24057
6417 [meth]: https://github.com/rust-lang/rust/pull/24056
6418 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
6419 [po]: https://github.com/rust-lang/rust/pull/24270
6420 [sf]: https://github.com/rust-lang/rust/pull/24517
6421 [slp]: https://github.com/rust-lang/rust/pull/23949
6422 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
6423 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
6424 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
6425 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
6426 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
6427 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
6428 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
6429 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
6430 [self-sized]: https://github.com/rust-lang/rust/pull/22301
6431 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
6432 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
6433 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
6434 [reflect]: https://github.com/rust-lang/rust/pull/23712
6435 [conversion]: https://github.com/rust-lang/rfcs/pull/529
6436 [num-traits]: https://github.com/rust-lang/rust/pull/23549
6437 [index-value]: https://github.com/rust-lang/rust/pull/23601
6438 [dropck]: https://github.com/rust-lang/rfcs/pull/769
6439 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
6440 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
6441 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
6442 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
6443 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
6446 Version 1.0.0-alpha.2 (2015-02-20)
6447 =====================================
6449 * ~1300 changes, numerous bugfixes
6453 * The various I/O modules were [overhauled][io-rfc] to reduce
6454 unnecessary abstractions and provide better interoperation with
6455 the underlying platform. The old `io` module remains temporarily
6457 * The standard library now [participates in feature gating][feat],
6458 so use of unstable libraries now requires a `#![feature(...)]`
6459 attribute. The impact of this change is [described on the
6460 forum][feat-forum]. [RFC][feat-rfc].
6464 * `for` loops [now operate on the `IntoIterator` trait][into],
6465 which eliminates the need to call `.iter()`, etc. to iterate
6466 over collections. There are some new subtleties to remember
6467 though regarding what sort of iterators various types yield, in
6468 particular that `for foo in bar { }` yields values from a move
6469 iterator, destroying the original collection. [RFC][into-rfc].
6470 * Objects now have [default lifetime bounds][obj], so you don't
6471 have to write `Box<Trait+'static>` when you don't care about
6472 storing references. [RFC][obj-rfc].
6473 * In types that implement `Drop`, [lifetimes must outlive the
6474 value][drop]. This will soon make it possible to safely
6475 implement `Drop` for types where `#[unsafe_destructor]` is now
6476 required. Read the [gorgeous RFC][drop-rfc] for details.
6477 * The fully qualified <T as Trait>::X syntax lets you set the Self
6478 type for a trait method or associated type. [RFC][ufcs-rfc].
6479 * References to types that implement `Deref<U>` now [automatically
6480 coerce to references][deref] to the dereferenced type `U`,
6481 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
6482 should eliminate many unsightly uses of `&*`, as when converting
6483 from references to vectors into references to
6484 slices. [RFC][deref-rfc].
6485 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
6486 `|:|`) is obsolete and closure kind is inferred from context.
6487 * [`Self` is a keyword][Self].
6491 * The `Show` and `String` formatting traits [have been
6492 renamed][fmt] to `Debug` and `Display` to more clearly reflect
6493 their related purposes. Automatically getting a string
6494 conversion to use with `format!("{:?}", something_to_debug)` is
6495 now written `#[derive(Debug)]`.
6496 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
6497 OsStr}`, provide strings in platform-specific encodings for easier
6498 interop with system APIs. [RFC][osstr-rfc].
6499 * The `boxed::into_raw` and `Box::from_raw` functions [convert
6500 between `Box<T>` and `*mut T`][boxraw], a common pattern for
6501 creating raw pointers.
6505 * Certain long error messages of the form 'expected foo found bar'
6506 are now [split neatly across multiple
6507 lines][multiline]. Examples in the PR.
6508 * On Unix Rust can be [uninstalled][un] by running
6509 `/usr/local/lib/rustlib/uninstall.sh`.
6510 * The `#[rustc_on_unimplemented]` attribute, requiring the
6511 'on_unimplemented' feature, lets rustc [display custom error
6512 messages when a trait is expected to be implemented for a type
6517 * Rust is tested against a [LALR grammar][lalr], which parses
6518 almost all the Rust files that rustc does.
6520 [boxraw]: https://github.com/rust-lang/rust/pull/21318
6521 [close]: https://github.com/rust-lang/rust/pull/21843
6522 [deref]: https://github.com/rust-lang/rust/pull/21351
6523 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
6524 [drop]: https://github.com/rust-lang/rust/pull/21972
6525 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6526 [feat]: https://github.com/rust-lang/rust/pull/21248
6527 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
6528 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
6529 [fmt]: https://github.com/rust-lang/rust/pull/21457
6530 [into]: https://github.com/rust-lang/rust/pull/20790
6531 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
6532 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6533 [lalr]: https://github.com/rust-lang/rust/pull/21452
6534 [multiline]: https://github.com/rust-lang/rust/pull/19870
6535 [obj]: https://github.com/rust-lang/rust/pull/22230
6536 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
6537 [onun]: https://github.com/rust-lang/rust/pull/20889
6538 [osstr]: https://github.com/rust-lang/rust/pull/21488
6539 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
6540 [Self]: https://github.com/rust-lang/rust/pull/22158
6541 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
6542 [un]: https://github.com/rust-lang/rust/pull/22256
6545 Version 1.0.0-alpha (2015-01-09)
6546 ==================================
6548 * ~2400 changes, numerous bugfixes
6552 * The language itself is considered feature complete for 1.0,
6553 though there will be many usability improvements and bugfixes
6554 before the final release.
6555 * Nearly 50% of the public API surface of the standard library has
6556 been declared 'stable'. Those interfaces are unlikely to change
6558 * The long-running debate over integer types has been
6559 [settled][ints]: Rust will ship with types named `isize` and
6560 `usize`, rather than `int` and `uint`, for pointer-sized
6561 integers. Guidelines will be rolled out during the alpha cycle.
6562 * Most crates that are not `std` have been moved out of the Rust
6563 distribution into the Cargo ecosystem so they can evolve
6564 separately and don't need to be stabilized as quickly, including
6565 'time', 'getopts', 'num', 'regex', and 'term'.
6566 * Documentation continues to be expanded with more API coverage, more
6567 examples, and more in-depth explanations. The guides have been
6568 consolidated into [The Rust Programming Language][trpl].
6569 * "[Rust By Example][rbe]" is now maintained by the Rust team.
6570 * All official Rust binary installers now come with [Cargo], the
6571 Rust package manager.
6575 * Closures have been [completely redesigned][unboxed] to be
6576 implemented in terms of traits, can now be used as generic type
6577 bounds and thus monomorphized and inlined, or via an opaque
6578 pointer (boxed) as in the old system. The new system is often
6579 referred to as 'unboxed' closures.
6580 * Traits now support [associated types][assoc], allowing families
6581 of related types to be defined together and used generically in
6583 * Enum variants are [namespaced by their type names][enum].
6584 * [`where` clauses][where] provide a more versatile and attractive
6585 syntax for specifying generic bounds, though the previous syntax
6587 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
6589 * Rust [no longer has a runtime][rt] of any description, and only
6590 supports OS threads, not green threads.
6591 * At long last, Rust has been overhauled for 'dynamically-sized
6592 types' ([DST]), which integrates 'fat pointers' (object types,
6593 arrays, and `str`) more deeply into the type system, making it
6595 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
6596 `..j` that produce range types and which, when combined with the
6597 `Index` operator and multidispatch, leads to a convenient slice
6599 * The new range syntax revealed an ambiguity in the fixed-length
6600 array syntax, so now fixed length arrays [are written `[T;
6602 * The `Copy` trait is no longer implemented automatically. Unsafe
6603 pointers no longer implement `Sync` and `Send` so types
6604 containing them don't automatically either. `Sync` and `Send`
6605 are now 'unsafe traits' so one can "forcibly" implement them via
6606 `unsafe impl` if a type confirms to the requirements for them
6607 even though the internals do not (e.g. structs containing unsafe
6608 pointers like `Arc`). These changes are intended to prevent some
6609 footguns and are collectively known as [opt-in built-in
6610 traits][oibit] (though `Sync` and `Send` will soon become pure
6611 library types unknown to the compiler).
6612 * Operator traits now take their operands [by value][ops], and
6613 comparison traits can use multidispatch to compare one type
6614 against multiple other types, allowing e.g. `String` to be
6615 compared with `&str`.
6616 * `if let` and `while let` are no longer feature-gated.
6617 * Rust has adopted a more [uniform syntax for escaping unicode
6618 characters][unicode].
6619 * `macro_rules!` [has been declared stable][mac]. Though it is a
6620 flawed system it is sufficiently popular that it must be usable
6621 for 1.0. Effort has gone into [future-proofing][mac-future] it
6622 in ways that will allow other macro systems to be developed in
6623 parallel, and won't otherwise impact the evolution of the
6625 * The prelude has been [pared back significantly][prelude] such
6626 that it is the minimum necessary to support the most pervasive
6627 code patterns, and through [generalized where clauses][where]
6628 many of the prelude extension traits have been consolidated.
6629 * Rust's rudimentary reflection [has been removed][refl], as it
6630 incurred too much code generation for little benefit.
6631 * [Struct variants][structvars] are no longer feature-gated.
6632 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
6633 known as 'higher-ranked trait bounds', this crucially allows
6634 unboxed closures to work.
6635 * Macros invocations surrounded by parens or square brackets and
6636 not terminated by a semicolon are [parsed as
6637 expressions][macros], which makes expressions like `vec![1i32,
6638 2, 3].len()` work as expected.
6639 * Trait objects now implement their traits automatically, and
6640 traits that can be coerced to objects now must be [object
6642 * Automatically deriving traits is now done with `#[derive(...)]`
6643 not `#[deriving(...)]` for [consistency with other naming
6644 conventions][derive].
6645 * Importing the containing module or enum at the same time as
6646 items or variants they contain is [now done with `self` instead
6647 of `mod`][self], as in use `foo::{self, bar}`
6648 * Glob imports are no longer feature-gated.
6649 * The `box` operator and `box` patterns have been feature-gated
6650 pending a redesign. For now unique boxes should be allocated
6651 like other containers, with `Box::new`.
6655 * A [series][coll1] of [efforts][coll2] to establish
6656 [conventions][coll3] for collections types has resulted in API
6657 improvements throughout the standard library.
6658 * New [APIs for error handling][err] provide ergonomic interop
6659 between error types, and [new conventions][err-conv] describe
6660 more clearly the recommended error handling strategies in Rust.
6661 * The `fail!` macro has been renamed to [`panic!`][panic] so that
6662 it is easier to discuss failure in the context of error handling
6663 without making clarifications as to whether you are referring to
6664 the 'fail' macro or failure more generally.
6665 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
6666 syscall when available.
6667 * The 'serialize' crate has been renamed 'rustc-serialize' and
6668 moved out of the distribution to Cargo. Although it is widely
6669 used now, it is expected to be superseded in the near future.
6670 * The `Show` formatter, typically implemented with
6671 `#[derive(Show)]` is [now requested with the `{:?}`
6672 specifier][show] and is intended for use by all types, for uses
6673 such as `println!` debugging. The new `String` formatter must be
6674 implemented by hand, uses the `{}` specifier, and is intended
6675 for full-fidelity conversions of things that can logically be
6676 represented as strings.
6680 * [Flexible target specification][flex] allows rustc's code
6681 generation to be configured to support otherwise-unsupported
6683 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6684 respective debuggers with Rust-appropriate pretty-printing.
6685 * The Windows installation of Rust is distributed with the
6686 MinGW components currently required to link binaries on that
6691 * Nullable enum optimizations have been extended to more types so
6692 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6693 space than the inner types themselves.
6694 * Work has begun on supporting AArch64.
6696 [Cargo]: https://crates.io
6697 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6698 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6699 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6700 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6701 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6702 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6703 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6704 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6705 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6706 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6707 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6708 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6709 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6710 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6711 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6712 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6713 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6714 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6715 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6716 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6717 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6718 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6719 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6720 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6721 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6722 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6723 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6724 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6725 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6726 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6727 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6728 [trpl]: https://doc.rust-lang.org/book/index.html
6729 [rbe]: http://rustbyexample.com/
6732 Version 0.12.0 (2014-10-09)
6733 =============================
6735 * ~1900 changes, numerous bugfixes
6739 * The introductory documentation (now called The Rust Guide) has
6740 been completely rewritten, as have a number of supplementary
6742 * Rust's package manager, Cargo, continues to improve and is
6743 sometimes considered to be quite awesome.
6744 * Many API's in `std` have been reviewed and updated for
6745 consistency with the in-development Rust coding
6746 guidelines. The standard library documentation tracks
6747 stabilization progress.
6748 * Minor libraries have been moved out-of-tree to the rust-lang org
6749 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6750 be installed with Cargo.
6751 * Lifetime elision allows lifetime annotations to be left off of
6752 function declarations in many common scenarios.
6753 * Rust now works on 64-bit Windows.
6756 * Indexing can be overloaded with the `Index` and `IndexMut`
6758 * The `if let` construct takes a branch only if the `let` pattern
6759 matches, currently behind the 'if_let' feature gate.
6760 * 'where clauses', a more flexible syntax for specifying trait
6761 bounds that is more aesthetic, have been added for traits and
6762 free functions. Where clauses will in the future make it
6763 possible to constrain associated types, which would be
6764 impossible with the existing syntax.
6765 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
6766 the 'slicing_syntax' feature gate, and can be overloaded with
6767 the `Slice` or `SliceMut` traits.
6768 * The syntax for matching of sub-slices has been changed to use a
6769 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
6770 consistency with other uses of `..` and to future-proof
6771 potential additional uses of the syntax.
6772 * The syntax for matching inclusive ranges in patterns has changed
6773 from `0..3` to `0...4` to be consistent with the exclusive range
6775 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
6776 c]`) has been put behind the 'advanced_slice_patterns' feature
6777 gate and may be removed in the future.
6778 * Components of tuples and tuple structs can be extracted using
6779 the `value.0` syntax, currently behind the `tuple_indexing`
6781 * The `#[crate_id]` attribute is no longer supported; versioning
6782 is handled by the package manager.
6783 * Renaming crate imports are now written `extern crate foo as bar`
6784 instead of `extern crate bar = foo`.
6785 * Renaming use statements are now written `use foo as bar` instead
6787 * `let` and `match` bindings and argument names in macros are now
6789 * The new, more efficient, closure types ('unboxed closures') have
6790 been added under a feature gate, 'unboxed_closures'. These will
6791 soon replace the existing closure types, once higher-ranked
6792 trait lifetimes are added to the language.
6793 * `move` has been added as a keyword, for indicating closures
6794 that capture by value.
6795 * Mutation and assignment is no longer allowed in pattern guards.
6796 * Generic structs and enums can now have trait bounds.
6797 * The `Share` trait is now called `Sync` to free up the term
6798 'shared' to refer to 'shared reference' (the default reference
6800 * Dynamically-sized types have been mostly implemented,
6801 unifying the behavior of fat-pointer types with the rest of the
6803 * As part of dynamically-sized types, the `Sized` trait has been
6804 introduced, which qualifying types implement by default, and
6805 which type parameters expect by default. To specify that a type
6806 parameter does not need to be sized, write `<Sized? T>`. Most
6807 types are `Sized`, notable exceptions being unsized arrays
6808 (`[T]`) and trait types.
6809 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
6810 * Lifetime bounds can now be applied to type parameters and object
6812 * The old, reference counted GC type, `Gc<T>` which was once
6813 denoted by the `@` sigil, has finally been removed. GC will be
6814 revisited in the future.
6817 * Library documentation has been improved for a number of modules.
6818 * Bit-vectors, collections::bitv has been modernized.
6819 * The url crate is deprecated in favor of
6820 http://github.com/servo/rust-url, which can be installed with
6822 * Most I/O stream types can be cloned and subsequently closed from
6824 * A `std::time::Duration` type has been added for use in I/O
6825 methods that rely on timers, as well as in the 'time' crate's
6826 `Timespec` arithmetic.
6827 * The runtime I/O abstraction layer that enabled the green thread
6828 scheduler to do non-thread-blocking I/O has been removed, along
6829 with the libuv-based implementation employed by the green thread
6830 scheduler. This will greatly simplify the future I/O work.
6831 * `collections::btree` has been rewritten to have a more
6832 idiomatic and efficient design.
6835 * rustdoc output now indicates the stability levels of API's.
6836 * The `--crate-name` flag can specify the name of the crate
6837 being compiled, like `#[crate_name]`.
6838 * The `-C metadata` specifies additional metadata to hash into
6839 symbol names, and `-C extra-filename` specifies additional
6840 information to put into the output filename, for use by the
6841 package manager for versioning.
6842 * debug info generation has continued to improve and should be
6843 more reliable under both gdb and lldb.
6844 * rustc has experimental support for compiling in parallel
6845 using the `-C codegen-units` flag.
6846 * rustc no longer encodes rpath information into binaries by
6850 * Stack usage has been optimized with LLVM lifetime annotations.
6851 * Official Rust binaries on Linux are more compatible with older
6852 kernels and distributions, built on CentOS 5.10.
6855 Version 0.11.0 (2014-07-02)
6856 ==========================
6858 * ~1700 changes, numerous bugfixes
6861 * ~[T] has been removed from the language. This type is superseded by
6863 * ~str has been removed from the language. This type is superseded by
6865 * ~T has been removed from the language. This type is superseded by the
6867 * @T has been removed from the language. This type is superseded by the
6868 standard library's std::gc::Gc<T> type.
6869 * Struct fields are now all private by default.
6870 * Vector indices and shift amounts are both required to be a `uint`
6871 instead of any integral type.
6872 * Byte character, byte string, and raw byte string literals are now all
6873 supported by prefixing the normal literal with a `b`.
6874 * Multiple ABIs are no longer allowed in an ABI string
6875 * The syntax for lifetimes on closures/procedures has been tweaked
6876 slightly: `<'a>|A, B|: 'b + K -> T`
6877 * Floating point modulus has been removed from the language; however it
6878 is still provided by a library implementation.
6879 * Private enum variants are now disallowed.
6880 * The `priv` keyword has been removed from the language.
6881 * A closure can no longer be invoked through a &-pointer.
6882 * The `use foo, bar, baz;` syntax has been removed from the language.
6883 * The transmute intrinsic no longer works on type parameters.
6884 * Statics now allow blocks/items in their definition.
6885 * Trait bounds are separated from objects with + instead of : now.
6886 * Objects can no longer be read while they are mutably borrowed.
6887 * The address of a static is now marked as insignificant unless the
6888 #[inline(never)] attribute is placed it.
6889 * The #[unsafe_destructor] attribute is now behind a feature gate.
6890 * Struct literals are no longer allowed in ambiguous positions such as
6891 if, while, match, and for..in.
6892 * Declaration of lang items and intrinsics are now feature-gated by
6894 * Integral literals no longer default to `int`, and floating point
6895 literals no longer default to `f64`. Literals must be suffixed with an
6896 appropriate type if inference cannot determine the type of the
6898 * The Box<T> type is no longer implicitly borrowed to &mut T.
6899 * Procedures are now required to not capture borrowed references.
6902 * The standard library is now a "facade" over a number of underlying
6903 libraries. This means that development on the standard library should
6904 be speedier due to smaller crates, as well as a clearer line between
6906 * A new library, libcore, lives under the standard library's facade
6907 which is Rust's "0-assumption" library, suitable for embedded and
6908 kernel development for example.
6909 * A regex crate has been added to the standard distribution. This crate
6910 includes statically compiled regular expressions.
6911 * The unwrap/unwrap_err methods on Result require a Show bound for
6912 better error messages.
6913 * The return types of the std::comm primitives have been centralized
6914 around the Result type.
6915 * A number of I/O primitives have gained the ability to time out their
6917 * A number of I/O primitives have gained the ability to close their
6918 reading/writing halves to cancel pending operations.
6919 * Reverse iterator methods have been removed in favor of `rev()` on
6920 their forward-iteration counterparts.
6921 * A bitflags! macro has been added to enable easy interop with C and
6922 management of bit flags.
6923 * A debug_assert! macro is now provided which is disabled when
6924 `--cfg ndebug` is passed to the compiler.
6925 * A graphviz crate has been added for creating .dot files.
6926 * The std::cast module has been migrated into std::mem.
6927 * The std::local_data api has been migrated from freestanding functions
6928 to being based on methods.
6929 * The Pod trait has been renamed to Copy.
6930 * jemalloc has been added as the default allocator for types.
6931 * The API for allocating memory has been changed to use proper alignment
6932 and sized deallocation
6933 * Connecting a TcpStream or binding a TcpListener is now based on a
6934 string address and a u16 port. This allows connecting to a hostname as
6936 * The Reader trait now contains a core method, read_at_least(), which
6937 correctly handles many repeated 0-length reads.
6938 * The process-spawning API is now centered around a builder-style
6940 * The :? printing qualifier has been moved from the standard library to
6941 an external libdebug crate.
6942 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
6943 have been renamed to Eq/Ord.
6944 * The select/plural methods have been removed from format!. The escapes
6945 for { and } have also changed from \{ and \} to {{ and }},
6947 * The TaskBuilder API has been re-worked to be a true builder, and
6948 extension traits for spawning native/green tasks have been added.
6951 * All breaking changes to the language or libraries now have their
6952 commit message annotated with `[breaking-change]` to allow for easy
6953 discovery of breaking changes.
6954 * The compiler will now try to suggest how to annotate lifetimes if a
6955 lifetime-related error occurs.
6956 * Debug info continues to be improved greatly with general bug fixes and
6957 better support for situations like link time optimization (LTO).
6958 * Usage of syntax extensions when cross-compiling has been fixed.
6959 * Functionality equivalent to GCC & Clang's -ffunction-sections,
6960 -fdata-sections and --gc-sections has been enabled by default
6961 * The compiler is now stricter about where it will load module files
6962 from when a module is declared via `mod foo;`.
6963 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
6964 Syntax extensions are now discovered via a "plugin registrar" type
6965 which will be extended in the future to other various plugins.
6966 * Lints have been restructured to allow for dynamically loadable lints.
6967 * A number of rustdoc improvements:
6968 * The HTML output has been visually redesigned.
6969 * Markdown is now powered by hoedown instead of sundown.
6970 * Searching heuristics have been greatly improved.
6971 * The search index has been reduced in size by a great amount.
6972 * Cross-crate documentation via `pub use` has been greatly improved.
6973 * Primitive types are now hyperlinked and documented.
6974 * Documentation has been moved from static.rust-lang.org/doc to
6976 * A new sandbox, play.rust-lang.org, is available for running and
6977 sharing rust code examples on-line.
6978 * Unused attributes are now more robustly warned about.
6979 * The dead_code lint now warns about unused struct fields.
6980 * Cross-compiling to iOS is now supported.
6981 * Cross-compiling to mipsel is now supported.
6982 * Stability attributes are now inherited by default and no longer apply
6983 to intra-crate usage, only inter-crate usage.
6984 * Error message related to non-exhaustive match expressions have been
6988 Version 0.10 (2014-04-03)
6989 =========================
6991 * ~1500 changes, numerous bugfixes
6994 * A new RFC process is now in place for modifying the language.
6995 * Patterns with `@`-pointers have been removed from the language.
6996 * Patterns with unique vectors (`~[T]`) have been removed from the
6998 * Patterns with unique strings (`~str`) have been removed from the
7000 * `@str` has been removed from the language.
7001 * `@[T]` has been removed from the language.
7002 * `@self` has been removed from the language.
7003 * `@Trait` has been removed from the language.
7004 * Headers on `~` allocations which contain `@` boxes inside the type for
7005 reference counting have been removed.
7006 * The semantics around the lifetimes of temporary expressions have changed,
7007 see #3511 and #11585 for more information.
7008 * Cross-crate syntax extensions are now possible, but feature gated. See
7009 #11151 for more information. This includes both `macro_rules!` macros as
7010 well as syntax extensions such as `format!`.
7011 * New lint modes have been added, and older ones have been turned on to be
7013 * Unnecessary parentheses
7016 * Uppercase variables
7017 * Publicly visible private types
7018 * `#[deriving]` with raw pointers
7019 * Unsafe functions can no longer be coerced to closures.
7020 * Various obscure macros such as `log_syntax!` are now behind feature gates.
7021 * The `#[simd]` attribute is now behind a feature gate.
7022 * Visibility is no longer allowed on `extern crate` statements, and
7023 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
7024 * Trailing commas are now allowed in argument lists and tuple patterns.
7025 * The `do` keyword has been removed, it is now a reserved keyword.
7026 * Default type parameters have been implemented, but are feature gated.
7027 * Borrowed variables through captures in closures are now considered soundly.
7028 * `extern mod` is now `extern crate`
7029 * The `Freeze` trait has been removed.
7030 * The `Share` trait has been added for types that can be shared among
7032 * Labels in macros are now hygienic.
7033 * Expression/statement macro invocations can be delimited with `{}` now.
7034 * Treatment of types allowed in `static mut` locations has been tweaked.
7035 * The `*` and `.` operators are now overloadable through the `Deref` and
7037 * `~Trait` and `proc` no longer have `Send` bounds by default.
7038 * Partial type hints are now supported with the `_` type marker.
7039 * An `Unsafe` type was introduced for interior mutability. It is now
7040 considered undefined to transmute from `&T` to `&mut T` without using the
7042 * The #[linkage] attribute was implemented for extern statics/functions.
7043 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
7044 * `Pod` was renamed to `Copy`.
7047 * The `libextra` library has been removed. It has now been decomposed into
7048 component libraries with smaller and more focused nuggets of
7049 functionality. The full list of libraries can be found on the
7050 documentation index page.
7051 * std: `std::condition` has been removed. All I/O errors are now propagated
7052 through the `Result` type. In order to assist with error handling, a
7053 `try!` macro for unwrapping errors with an early return and a lint for
7054 unused results has been added. See #12039 for more information.
7055 * std: The `vec` module has been renamed to `slice`.
7056 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
7057 This will become the only growable vector in the future.
7058 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
7059 are now found at `std::io::BufferedReader` instead of
7060 `std::io::buffered::BufferedReader`.
7061 * std: `print` and `println` are no longer in the prelude, the `print!` and
7062 `println!` macros are intended to be used instead.
7063 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
7064 attempts to statically prevent cycles.
7065 * std: The standard distribution is adopting the policy of pushing failure
7066 to the user rather than failing in libraries. Many functions (such as
7067 `slice::last()`) now return `Option<T>` instead of `T` + failing.
7068 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
7069 deriving mode: `#[deriving(Show)]`.
7070 * std: `ToStr` is now implemented for all types implementing `Show`.
7071 * std: The formatting trait methods now take `&self` instead of `&T`
7072 * std: The `invert()` method on iterators has been renamed to `rev()`
7073 * std: `std::num` has seen a reduction in the genericity of its traits,
7074 consolidating functionality into a few core traits.
7075 * std: Backtraces are now printed on task failure if the environment
7076 variable `RUST_BACKTRACE` is present.
7077 * std: Naming conventions for iterators have been standardized. More details
7078 can be found on the wiki's style guide.
7079 * std: `eof()` has been removed from the `Reader` trait. Specific types may
7080 still implement the function.
7081 * std: Networking types are now cloneable to allow simultaneous reads/writes.
7082 * std: `assert_approx_eq!` has been removed
7083 * std: The `e` and `E` formatting specifiers for floats have been added to
7084 print them in exponential notation.
7085 * std: The `Times` trait has been removed
7086 * std: Indications of variance and opting out of builtin bounds is done
7087 through marker types in `std::kinds::marker` now
7088 * std: `hash` has been rewritten, `IterBytes` has been removed, and
7089 `#[deriving(Hash)]` is now possible.
7090 * std: `SharedChan` has been removed, `Sender` is now cloneable.
7091 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
7092 * std: `Chan::new` is now `channel()`.
7093 * std: A new synchronous channel type has been implemented.
7094 * std: A `select!` macro is now provided for selecting over `Receiver`s.
7095 * std: `hashmap` and `trie` have been moved to `libcollections`
7096 * std: `run` has been rolled into `io::process`
7097 * std: `assert_eq!` now uses `{}` instead of `{:?}`
7098 * std: The equality and comparison traits have seen some reorganization.
7099 * std: `rand` has moved to `librand`.
7100 * std: `to_{lower,upper}case` has been implemented for `char`.
7101 * std: Logging has been moved to `liblog`.
7102 * collections: `HashMap` has been rewritten for higher performance and less
7104 * native: The default runtime is now `libnative`. If `libgreen` is desired,
7105 it can be booted manually. The runtime guide has more information and
7107 * native: All I/O functionality except signals has been implemented.
7108 * green: Task spawning with `libgreen` has been optimized with stack caching
7109 and various trimming of code.
7110 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
7111 * sync: The `extra::sync` module has been updated to modern rust (and moved
7112 to the `sync` library), tweaking and improving various interfaces while
7113 dropping redundant functionality.
7114 * sync: A new `Barrier` type has been added to the `sync` library.
7115 * sync: An efficient mutex for native and green tasks has been implemented.
7116 * serialize: The `base64` module has seen some improvement. It treats
7117 newlines better, has non-string error values, and has seen general
7119 * fourcc: A `fourcc!` macro was introduced
7120 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
7121 hexadecimal literal.
7124 * `rustpkg` has been deprecated and removed from the main repository. Its
7125 replacement, `cargo`, is under development.
7126 * Nightly builds of rust are now available
7127 * The memory usage of rustc has been improved many times throughout this
7129 * The build process supports disabling rpath support for the rustc binary
7131 * Code generation has improved in some cases, giving more information to the
7132 LLVM optimization passes to enable more extensive optimizations.
7133 * Debuginfo compatibility with lldb on OSX has been restored.
7134 * The master branch is now gated on an android bot, making building for
7135 android much more reliable.
7136 * Output flags have been centralized into one `--emit` flag.
7137 * Crate type flags have been centralized into one `--crate-type` flag.
7138 * Codegen flags have been consolidated behind a `-C` flag.
7139 * Linking against outdated crates now has improved error messages.
7140 * Error messages with lifetimes will often suggest how to annotate the
7141 function to fix the error.
7142 * Many more types are documented in the standard library, and new guides
7144 * Many `rustdoc` improvements:
7145 * code blocks are syntax highlighted.
7146 * render standalone markdown files.
7147 * the --test flag tests all code blocks by default.
7148 * exported macros are displayed.
7149 * re-exported types have their documentation inlined at the location of the
7151 * search works across crates that have been rendered to the same output
7155 Version 0.9 (2014-01-09)
7156 ==========================
7158 * ~1800 changes, numerous bugfixes
7161 * The `float` type has been removed. Use `f32` or `f64` instead.
7162 * A new facility for enabling experimental features (feature gating) has
7163 been added, using the crate-level `#[feature(foo)]` attribute.
7164 * Managed boxes (@) are now behind a feature gate
7165 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
7166 standard library's `Gc` or `Rc` types instead.
7167 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
7168 * Jumping back to the top of a loop is now done with `continue` instead of
7170 * Strings can no longer be mutated through index assignment.
7171 * Raw strings can be created via the basic `r"foo"` syntax or with matched
7172 hash delimiters, as in `r###"foo"###`.
7173 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
7175 * The `&fn` type is now written `|args| -> ret` to match the literal form.
7176 * `@fn`s have been removed.
7177 * `do` only works with procs in order to make it obvious what the cost
7179 * Single-element tuple-like structs can no longer be dereferenced to
7180 obtain the inner value. A more comprehensive solution for overloading
7181 the dereference operator will be provided in the future.
7182 * The `#[link(...)]` attribute has been replaced with
7183 `#[crate_id = "name#vers"]`.
7184 * Empty `impl`s must be terminated with empty braces and may not be
7185 terminated with a semicolon.
7186 * Keywords are no longer allowed as lifetime names; the `self` lifetime
7187 no longer has any special meaning.
7188 * The old `fmt!` string formatting macro has been removed.
7189 * `printf!` and `printfln!` (old-style formatting) removed in favor of
7190 `print!` and `println!`.
7191 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
7192 * The `extern mod foo (name = "bar")` syntax has been removed. Use
7193 `extern mod foo = "bar"` instead.
7194 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
7195 * Macros can have attributes.
7196 * Macros can expand to items with attributes.
7197 * Macros can expand to multiple items.
7198 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
7199 * Comments may be nested.
7200 * Values automatically coerce to trait objects they implement, without
7202 * Enum discriminants are no longer an entire word but as small as needed to
7203 contain all the variants. The `repr` attribute can be used to override
7204 the discriminant size, as in `#[repr(int)]` for integer-sized, and
7205 `#[repr(C)]` to match C enums.
7206 * Non-string literals are not allowed in attributes (they never worked).
7207 * The FFI now supports variadic functions.
7208 * Octal numeric literals, as in `0o7777`.
7209 * The `concat!` syntax extension performs compile-time string concatenation.
7210 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
7211 removed as Rust no longer uses segmented stacks.
7212 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
7213 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
7214 not `*`; ignoring remaining fields of a struct is also done with `..`,
7215 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
7216 * `rustc` supports the "win64" calling convention via `extern "win64"`.
7217 * `rustc` supports the "system" calling convention, which defaults to the
7218 preferred convention for the target platform, "stdcall" on 32-bit Windows,
7220 * The `type_overflow` lint (default: warn) checks literals for overflow.
7221 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
7222 * The `attribute_usage` lint (default: warn) warns about unknown
7224 * The `unknown_features` lint (default: warn) warns about unknown
7226 * The `dead_code` lint (default: warn) checks for dead code.
7227 * Rust libraries can be linked statically to one another
7228 * `#[link_args]` is behind the `link_args` feature gate.
7229 * Native libraries are now linked with `#[link(name = "foo")]`
7230 * Native libraries can be statically linked to a rust crate
7231 (`#[link(name = "foo", kind = "static")]`).
7232 * Native OS X frameworks are now officially supported
7233 (`#[link(name = "foo", kind = "framework")]`).
7234 * The `#[thread_local]` attribute creates thread-local (not task-local)
7235 variables. Currently behind the `thread_local` feature gate.
7236 * The `return` keyword may be used in closures.
7237 * Types that can be copied via a memcpy implement the `Pod` kind.
7238 * The `cfg` attribute can now be used on struct fields and enum variants.
7241 * std: The `option` and `result` API's have been overhauled to make them
7242 simpler, more consistent, and more composable.
7243 * std: The entire `std::io` module has been replaced with one that is
7244 more comprehensive and that properly interfaces with the underlying
7245 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
7247 * std: `io::util` contains a number of useful implementations of
7248 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
7249 `ZeroReader`, `TeeReader`.
7250 * std: The reference counted pointer type `extra::rc` moved into std.
7251 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
7252 just a wrapper around it).
7253 * std: The `Either` type has been removed.
7254 * std: `fmt::Default` can be implemented for any type to provide default
7255 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
7256 * std: The `rand` API continues to be tweaked.
7257 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
7258 on failure in gdb, is now named `rust_fail`.
7259 * std: The `each_key` and `each_value` methods on `HashMap` have been
7260 replaced by the `keys` and `values` iterators.
7261 * std: Functions dealing with type size and alignment have moved from the
7262 `sys` module to the `mem` module.
7263 * std: The `path` module was written and API changed.
7264 * std: `str::from_utf8` has been changed to cast instead of allocate.
7265 * std: `starts_with` and `ends_with` methods added to vectors via the
7266 `ImmutableEqVector` trait, which is in the prelude.
7267 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
7268 if the index is out of bounds.
7269 * std: Task failure no longer propagates between tasks, as the model was
7270 complex, expensive, and incompatible with thread-based tasks.
7271 * std: The `Any` type can be used for dynamic typing.
7272 * std: `~Any` can be passed to the `fail!` macro and retrieved via
7274 * std: Methods that produce iterators generally do not have an `_iter`
7276 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
7277 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
7278 * std: `util::ignore` renamed to `prelude::drop`.
7279 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
7281 * std: `vec::raw` has seen a lot of cleanup and API changes.
7282 * std: The standard library no longer includes any C++ code, and very
7283 minimal C, eliminating the dependency on libstdc++.
7284 * std: Runtime scheduling and I/O functionality has been factored out into
7285 extensible interfaces and is now implemented by two different crates:
7286 libnative, for native threading and I/O; and libgreen, for green threading
7287 and I/O. This paves the way for using the standard library in more limited
7288 embedded environments.
7289 * std: The `comm` module has been rewritten to be much faster, have a
7290 simpler, more consistent API, and to work for both native and green
7292 * std: All libuv dependencies have been moved into the rustuv crate.
7293 * native: New implementations of runtime scheduling on top of OS threads.
7294 * native: New native implementations of TCP, UDP, file I/O, process spawning,
7296 * green: The green thread scheduler and message passing types are almost
7298 * extra: The `flatpipes` module had bitrotted and was removed.
7299 * extra: All crypto functions have been removed and Rust now has a policy of
7300 not reimplementing crypto in the standard library. In the future crypto
7301 will be provided by external crates with bindings to established libraries.
7302 * extra: `c_vec` has been modernized.
7303 * extra: The `sort` module has been removed. Use the `sort` method on
7307 * The `rust` and `rusti` commands have been removed, due to lack of
7309 * `rustdoc` was completely rewritten.
7310 * `rustdoc` can test code examples in documentation.
7311 * `rustpkg` can test packages with the argument, 'test'.
7312 * `rustpkg` supports arbitrary dependencies, including C libraries.
7313 * `rustc`'s support for generating debug info is improved again.
7314 * `rustc` has better error reporting for unbalanced delimiters.
7315 * `rustc`'s JIT support was removed due to bitrot.
7316 * Executables and static libraries can be built with LTO (-Z lto)
7317 * `rustc` adds a `--dep-info` flag for communicating dependencies to
7321 Version 0.8 (2013-09-26)
7322 ============================
7324 * ~2200 changes, numerous bugfixes
7327 * The `for` loop syntax has changed to work with the `Iterator` trait.
7328 * At long last, unwinding works on Windows.
7329 * Default methods are ready for use.
7330 * Many trait inheritance bugs fixed.
7331 * Owned and borrowed trait objects work more reliably.
7332 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
7333 * rustc can omit emission of code for the `debug!` macro if it is passed
7335 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
7336 for foo.rs, then foo/mod.rs, and will generate an error when both are
7338 * Strings no longer contain trailing nulls. The new `std::c_str` module
7339 provides new mechanisms for converting to C strings.
7340 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
7341 * The FFI has been overhauled such that foreign functions are called directly,
7342 instead of through a stack-switching wrapper.
7343 * Calling a foreign function must be done through a Rust function with the
7344 `#[fixed_stack_segment]` attribute.
7345 * The `externfn!` macro can be used to declare both a foreign function and
7346 a `#[fixed_stack_segment]` wrapper at once.
7347 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
7348 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
7349 * `priv` is disallowed everywhere except for struct fields and enum variants.
7350 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
7351 * `ref` bindings in irrefutable patterns work correctly now.
7352 * `char` is now prevented from containing invalid code points.
7353 * Casting to `bool` is no longer allowed.
7354 * `\0` is now accepted as an escape in chars and strings.
7355 * `yield` is a reserved keyword.
7356 * `typeof` is a reserved keyword.
7357 * Crates may be imported by URL with `extern mod foo = "url";`.
7358 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
7359 * Static vectors can be initialized with repeating elements,
7360 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
7361 * Static structs can be initialized with functional record update,
7362 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
7363 * `cfg!` can be used to conditionally execute code based on the crate
7364 configuration, similarly to `#[cfg(...)]`.
7365 * The `unnecessary_qualification` lint detects unneeded module
7366 prefixes (default: allow).
7367 * Arithmetic operations have been implemented on the SIMD types in
7368 `std::unstable::simd`.
7369 * Exchange allocation headers were removed, reducing memory usage.
7370 * `format!` implements a completely new, extensible, and higher-performance
7371 string formatting system. It will replace `fmt!`.
7372 * `print!` and `println!` write formatted strings (using the `format!`
7373 extension) to stdout.
7374 * `write!` and `writeln!` write formatted strings (using the `format!`
7375 extension) to the new Writers in `std::rt::io`.
7376 * The library section in which a function or static is placed may
7377 be specified with `#[link_section = "..."]`.
7378 * The `proto!` syntax extension for defining bounded message protocols
7380 * `macro_rules!` is hygienic for `let` declarations.
7381 * The `#[export_name]` attribute specifies the name of a symbol.
7382 * `unreachable!` can be used to indicate unreachable code, and fails
7386 * std: Transitioned to the new runtime, written in Rust.
7387 * std: Added an experimental I/O library, `rt::io`, based on the new
7389 * std: A new generic `range` function was added to the prelude, replacing
7390 `uint::range` and friends.
7391 * std: `range_rev` no longer exists. Since range is an iterator it can be
7392 reversed with `range(lo, hi).invert()`.
7393 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
7394 renamed to `unwrap_or`.
7395 * std: The `iterator` module was renamed to `iter`.
7396 * std: Integral types now support the `checked_add`, `checked_sub`, and
7397 `checked_mul` operations for detecting overflow.
7398 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
7400 * std: Methods are standardizing on conventions for casting methods:
7401 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
7403 * std: The `CString` type in `c_str` provides new ways to convert to and
7405 * std: `DoubleEndedIterator` can yield elements in two directions.
7406 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
7408 * std: `str::from_bytes` renamed to `str::from_utf8`.
7409 * std: `pop_opt` and `shift_opt` methods added to vectors.
7410 * std: The task-local data interface no longer uses @, and keys are
7411 no longer function pointers.
7412 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
7413 * std: Added `SharedPort` to `comm`.
7414 * std: `Eq` has a default method for `ne`; only `eq` is required
7416 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
7417 is required in implementations.
7418 * std: `is_utf8` performance is improved, impacting many string functions.
7419 * std: `os::MemoryMap` provides cross-platform mmap.
7420 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
7421 are not 'in-bounds' are considered undefined.
7422 * std: Many freestanding functions in `vec` removed in favor of methods.
7423 * std: Many freestanding functions on scalar types removed in favor of
7425 * std: Many options to task builders were removed since they don't make
7426 sense in the new scheduler design.
7427 * std: More containers implement `FromIterator` so can be created by the
7429 * std: More complete atomic types in `unstable::atomics`.
7430 * std: `comm::PortSet` removed.
7431 * std: Mutating methods in the `Set` and `Map` traits have been moved into
7432 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
7433 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
7434 default implementations.
7435 * std: Various `from_str` functions were removed in favor of a generic
7436 `from_str` which is available in the prelude.
7437 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
7438 * extra: `dlist`, the doubly-linked list was modernized.
7439 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
7440 * extra: Added `glob` module, replacing `std::os::glob`.
7441 * extra: `rope` was removed.
7442 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
7443 * extra: `net`, and `timer` were removed. The experimental replacements
7444 are `std::rt::io::net` and `std::rt::io::timer`.
7445 * extra: Iterators implemented for `SmallIntMap`.
7446 * extra: Iterators implemented for `Bitv` and `BitvSet`.
7447 * extra: `SmallIntSet` removed. Use `BitvSet`.
7448 * extra: Performance of JSON parsing greatly improved.
7449 * extra: `semver` updated to SemVer 2.0.0.
7450 * extra: `term` handles more terminals correctly.
7451 * extra: `dbg` module removed.
7452 * extra: `par` module removed.
7453 * extra: `future` was cleaned up, with some method renames.
7454 * extra: Most free functions in `getopts` were converted to methods.
7457 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
7458 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
7459 similarly to gcc's `--march` flag.
7460 * rustc's performance compiling small crates is much better.
7461 * rustpkg has received many improvements.
7462 * rustpkg supports git tags as package IDs.
7463 * rustpkg builds into target-specific directories so it can be used for
7465 * The number of concurrent test tasks is controlled by the environment
7466 variable RUST_TEST_TASKS.
7467 * The test harness can now report metrics for benchmarks.
7468 * All tools have man pages.
7469 * Programs compiled with `--test` now support the `-h` and `--help` flags.
7470 * The runtime uses jemalloc for allocations.
7471 * Segmented stacks are temporarily disabled as part of the transition to
7472 the new runtime. Stack overflows are possible!
7473 * A new documentation backend, rustdoc_ng, is available for use. It is
7474 still invoked through the normal `rustdoc` command.
7477 Version 0.7 (2013-07-03)
7478 =======================
7480 * ~2000 changes, numerous bugfixes
7483 * `impl`s no longer accept a visibility qualifier. Put them on methods
7485 * The borrow checker has been rewritten with flow-sensitivity, fixing
7486 many bugs and inconveniences.
7487 * The `self` parameter no longer implicitly means `&'self self`,
7488 and can be explicitly marked with a lifetime.
7489 * Overloadable compound operators (`+=`, etc.) have been temporarily
7490 removed due to bugs.
7491 * The `for` loop protocol now requires `for`-iterators to return `bool`
7492 so they compose better.
7493 * The `Durable` trait is replaced with the `'static` bounds.
7494 * Trait default methods work more often.
7495 * Structs with the `#[packed]` attribute have byte alignment and
7496 no padding between fields.
7497 * Type parameters bound by `Copy` must now be copied explicitly with
7499 * It is now illegal to move out of a dereferenced unsafe pointer.
7500 * `Option<~T>` is now represented as a nullable pointer.
7501 * `@mut` does dynamic borrow checks correctly.
7502 * The `main` function is only detected at the topmost level of the crate.
7503 The `#[main]` attribute is still valid anywhere.
7504 * Struct fields may no longer be mutable. Use inherited mutability.
7505 * The `#[no_send]` attribute makes a type that would otherwise be
7507 * The `#[no_freeze]` attribute makes a type that would otherwise be
7509 * Unbounded recursion will abort the process after reaching the limit
7510 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
7511 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
7512 are never implicitly copyable.
7513 * `#[static_assert]` makes compile-time assertions about static bools.
7514 * At long last, 'argument modes' no longer exist.
7515 * The rarely used `use mod` statement no longer exists.
7518 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
7520 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
7521 `Rand`, `Zero` and `ToStr` can all be automatically derived with
7523 * The `bytes!` macro returns a vector of bytes for string, u8, char,
7524 and unsuffixed integer literals.
7527 * The `core` crate was renamed to `std`.
7528 * The `std` crate was renamed to `extra`.
7529 * More and improved documentation.
7530 * std: `iterator` module for external iterator objects.
7531 * Many old-style (internal, higher-order function) iterators replaced by
7532 implementations of `Iterator`.
7533 * std: Many old internal vector and string iterators,
7534 incl. `any`, `all`. removed.
7535 * std: The `finalize` method of `Drop` renamed to `drop`.
7536 * std: The `drop` method now takes `&mut self` instead of `&self`.
7537 * std: The prelude no longer re-exports any modules, only types and traits.
7538 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
7539 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
7540 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
7541 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
7542 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
7543 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
7544 * std: Many types implement `Clone`.
7545 * std: `path` type renamed to `Path`.
7546 * std: `mut` module and `Mut` type removed.
7547 * std: Many standalone functions removed in favor of methods and iterators
7548 in `vec`, `str`. In the future methods will also work as functions.
7549 * std: `reinterpret_cast` removed. Use `transmute`.
7550 * std: ascii string handling in `std::ascii`.
7551 * std: `Rand` is implemented for ~/@.
7552 * std: `run` module for spawning processes overhauled.
7553 * std: Various atomic types added to `unstable::atomic`.
7554 * std: Various types implement `Zero`.
7555 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
7556 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
7557 * std: Added `os::mkdir_recursive`.
7558 * std: Added `os::glob` function performs filesystems globs.
7559 * std: `FuzzyEq` renamed to `ApproxEq`.
7560 * std: `Map` now defines `pop` and `swap` methods.
7561 * std: `Cell` constructors converted to static methods.
7562 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
7563 * extra: `flate` module moved from `std` to `extra`.
7564 * extra: `fileinput` module for iterating over a series of files.
7565 * extra: `Complex` number type and `complex` module.
7566 * extra: `Rational` number type and `rational` module.
7567 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
7568 * extra: `term` uses terminfo now, is more correct.
7569 * extra: `arc` functions converted to methods.
7570 * extra: Implementation of fixed output size variations of SHA-2.
7573 * `unused_variable` lint mode for unused variables (default: warn).
7574 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
7576 * `unused_mut` lint mode for identifying unused `mut` qualifiers
7578 * `dead_assignment` lint mode for unread variables (default: warn).
7579 * `unnecessary_allocation` lint mode detects some heap allocations that are
7580 immediately borrowed so could be written without allocating (default: warn).
7581 * `missing_doc` lint mode (default: allow).
7582 * `unreachable_code` lint mode (default: warn).
7583 * The `rusti` command has been rewritten and a number of bugs addressed.
7584 * rustc outputs in color on more terminals.
7585 * rustc accepts a `--link-args` flag to pass arguments to the linker.
7586 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
7587 * Compiling with `-g` will make the binary record information about
7588 dynamic borrowcheck failures for debugging.
7589 * rustdoc has a nicer stylesheet.
7590 * Various improvements to rustdoc.
7591 * Improvements to rustpkg (see the detailed release notes).
7594 Version 0.6 (2013-04-03)
7595 ========================
7597 * ~2100 changes, numerous bugfixes
7600 * The self type parameter in traits is now spelled `Self`
7601 * The `self` parameter in trait and impl methods must now be explicitly
7602 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
7603 * Static methods no longer require the `static` keyword and instead
7604 are distinguished by the lack of a `self` parameter
7605 * Replaced the `Durable` trait with the `'static` lifetime
7606 * The old closure type syntax with the trailing sigil has been
7607 removed in favor of the more consistent leading sigil
7608 * `super` is a keyword, and may be prefixed to paths
7609 * Trait bounds are separated with `+` instead of whitespace
7610 * Traits are implemented with `impl Trait for Type`
7611 instead of `impl Type: Trait`
7612 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
7613 * The `export` keyword has finally been removed
7614 * The `move` keyword has been removed (see "Semantic changes")
7615 * The interior mutability qualifier on vectors, `[mut T]`, has been
7616 removed. Use `&mut [T]`, etc.
7617 * `mut` is no longer valid in `~mut T`. Use inherited mutability
7618 * `fail` is no longer a keyword. Use `fail!()`
7619 * `assert` is no longer a keyword. Use `assert!()`
7620 * `log` is no longer a keyword. use `debug!`, etc.
7621 * 1-tuples may be represented as `(T,)`
7622 * Struct fields may no longer be `mut`. Use inherited mutability,
7623 `@mut T`, `core::mut` or `core::cell`
7624 * `extern mod { ... }` is no longer valid syntax for foreign
7625 function modules. Use extern blocks: `extern { ... }`
7626 * Newtype enums removed. Use tuple-structs.
7627 * Trait implementations no longer support visibility modifiers
7628 * Pattern matching over vectors improved and expanded
7629 * `const` renamed to `static` to correspond to lifetime name,
7630 and make room for future `static mut` unsafe mutable globals.
7631 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
7632 * `Clone` implementations can be automatically generated with
7633 `#[deriving(Clone)]`
7634 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
7635 instead of `foo as Bar`.
7636 * Fixed length vector types are now written as `[int, .. 3]`
7637 instead of `[int * 3]`.
7638 * Fixed length vector types can express the length as a constant
7639 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
7642 * Types with owned pointers or custom destructors move by default,
7643 eliminating the `move` keyword
7644 * All foreign functions are considered unsafe
7645 * &mut is now unaliasable
7646 * Writes to borrowed @mut pointers are prevented dynamically
7648 * The name of the main function can be customized using #[main]
7649 * The default type of an inferred closure is &fn instead of @fn
7650 * `use` statements may no longer be "chained" - they cannot import
7651 identifiers imported by previous `use` statements
7652 * `use` statements are crate relative, importing from the "top"
7653 of the crate by default. Paths may be prefixed with `super::`
7654 or `self::` to change the search behavior.
7655 * Method visibility is inherited from the implementation declaration
7656 * Structural records have been removed
7657 * Many more types can be used in static items, including enums
7658 'static-lifetime pointers and vectors
7659 * Pattern matching over vectors improved and expanded
7660 * Typechecking of closure types has been overhauled to
7661 improve inference and eliminate unsoundness
7662 * Macros leave scope at the end of modules, unless that module is
7663 tagged with #[macro_escape]
7666 * Added big integers to `std::bigint`
7667 * Removed `core::oldcomm` module
7668 * Added pipe-based `core::comm` module
7669 * Numeric traits have been reorganized under `core::num`
7670 * `vec::slice` finally returns a slice
7671 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7672 * Containers reorganized around traits in `core::container`
7673 * `core::dvec` removed, `~[T]` is a drop-in replacement
7674 * `core::send_map` renamed to `core::hashmap`
7675 * `std::map` removed; replaced with `core::hashmap`
7676 * `std::treemap` reimplemented as an owned balanced tree
7677 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7678 * `core::trie` added as a fast ordered map for integer keys
7679 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7680 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7681 overload the comparison operators, whereas `TotalOrd` is used
7682 by certain container types
7685 * Replaced the 'cargo' package manager with 'rustpkg'
7686 * Added all-purpose 'rust' tool
7687 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7688 * rustc now *attempts* to offer spelling suggestions
7689 * Improved support for ARM and Android
7690 * Preliminary MIPS backend
7691 * Improved foreign function ABI implementation for x86, x86_64
7692 * Various memory usage improvements
7693 * Rust code may be embedded in foreign code under limited circumstances
7694 * Inline assembler supported by new asm!() syntax extension.
7697 Version 0.5 (2012-12-21)
7698 ===========================
7700 * ~900 changes, numerous bugfixes
7703 * Removed `<-` move operator
7704 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7705 * Removed old fixed length vector syntax - `[T]/N`
7706 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7707 * Macros may now expand to items and statements
7708 * `a.b()` is always parsed as a method call, never as a field projection
7709 * `Eq` and `IterBytes` implementations can be automatically generated
7710 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7711 * Removed the special crate language for `.rc` files
7712 * Function arguments may consist of any irrefutable pattern
7715 * `&` and `~` pointers may point to objects
7716 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7717 * Enum variants may be structs
7718 * Destructors can be added to all nominal types with the Drop trait
7719 * Structs and nullary enum variants may be constants
7720 * Values that cannot be implicitly copied are now automatically moved
7721 without writing `move` explicitly
7722 * `&T` may now be coerced to `*T`
7723 * Coercions happen in `let` statements as well as function calls
7724 * `use` statements now take crate-relative paths
7725 * The module and type namespaces have been merged so that static
7726 method names can be resolved under the trait in which they are
7729 * Improved support for language features
7730 * Trait inheritance works in many scenarios
7731 * More support for explicit self arguments in methods - `self`, `&self`
7732 `@self`, and `~self` all generally work as expected
7733 * Static methods work in more situations
7734 * Experimental: Traits may declare default methods for the implementations
7738 * New condition handling system in `core::condition`
7739 * Timsort added to `std::sort`
7740 * New priority queue, `std::priority_queue`
7741 * Pipes for serializable types, `std::flatpipes'
7742 * Serialization overhauled to be trait-based
7743 * Expanded `getopts` definitions
7744 * Moved futures to `std`
7745 * More functions are pure now
7746 * `core::comm` renamed to `oldcomm`. Still deprecated
7747 * `rustdoc` and `cargo` are libraries now
7750 * Added a preliminary REPL, `rusti`
7751 * License changed from MIT to dual MIT/APL2
7754 Version 0.4 (2012-10-15)
7755 ==========================
7757 * ~2000 changes, numerous bugfixes
7760 * All keywords are now strict and may not be used as identifiers anywhere
7761 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7762 'of', 'with', 'to', 'class'.
7763 * Classes are replaced with simpler structs
7764 * Explicit method self types
7765 * `ret` became `return` and `alt` became `match`
7766 * `import` is now `use`; `use is now `extern mod`
7767 * `extern mod { ... }` is now `extern { ... }`
7768 * `use mod` is the recommended way to import modules
7769 * `pub` and `priv` replace deprecated export lists
7770 * The syntax of `match` pattern arms now uses fat arrow (=>)
7771 * `main` no longer accepts an args vector; use `os::args` instead
7774 * Trait implementations are now coherent, ala Haskell typeclasses
7775 * Trait methods may be static
7776 * Argument modes are deprecated
7777 * Borrowed pointers are much more mature and recommended for use
7778 * Strings and vectors in the static region are stored in constant memory
7779 * Typestate was removed
7780 * Resolution rewritten to be more reliable
7781 * Support for 'dual-mode' data structures (freezing and thawing)
7784 * Most binary operators can now be overloaded via the traits in
7786 * `std::net::url` for representing URLs
7787 * Sendable hash maps in `core::send_map`
7788 * `core::task' gained a (currently unsafe) task-local storage API
7791 * An efficient new intertask communication primitive called the pipe,
7792 along with a number of higher-level channel types, in `core::pipes`
7793 * `std::arc`, an atomically reference counted, immutable, shared memory
7795 * `std::sync`, various exotic synchronization tools based on arcs and pipes
7796 * Futures are now based on pipes and sendable
7797 * More robust linked task failure
7798 * Improved task builder API
7801 * Improved error reporting
7802 * Preliminary JIT support
7803 * Preliminary work on precise GC
7804 * Extensive architectural improvements to rustc
7805 * Begun a transition away from buggy C++-based reflection (shape) code to
7806 Rust-based (visitor) code
7807 * All hash functions and tables converted to secure, randomized SipHash
7810 Version 0.3 (2012-07-12)
7811 ========================
7813 * ~1900 changes, numerous bugfixes
7815 * New coding conveniences
7816 * Integer-literal suffix inference
7817 * Per-item control over warnings, errors
7818 * #[cfg(windows)] and #[cfg(unix)] attributes
7819 * Documentation comments
7820 * More compact closure syntax
7821 * 'do' expressions for treating higher-order functions as
7823 * *-patterns (wildcard extended to all constructor fields)
7826 * Name resolution pass and exhaustiveness checker rewritten
7827 * Region pointers and borrow checking supersede alias
7829 * Init-ness checking is now provided by a region-based liveness
7830 pass instead of the typestate pass; same for last-use analysis
7831 * Extensive work on region pointers
7833 * Experimental new language features
7834 * Slices and fixed-size, interior-allocated vectors
7835 * #!-comments for lang versioning, shell execution
7836 * Destructors and iface implementation for classes;
7837 type-parameterized classes and class methods
7838 * 'const' type kind for types that can be used to implement
7839 shared-memory concurrency patterns
7843 * Removal of various obsolete features
7844 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
7845 'crust', 'native' (now 'extern'), 'cont' (now 'again')
7847 * Constructs: do-while loops ('do' repurposed), fn binding,
7848 resources (replaced by destructors)
7850 * Compiler reorganization
7851 * Syntax-layer of compiler split into separate crate
7852 * Clang (from LLVM project) integrated into build
7853 * Typechecker split into sub-modules
7856 * New time functions
7857 * Extension methods for many built-in types
7858 * Arc: atomic-refcount read-only / exclusive-use shared cells
7859 * Par: parallel map and search routines
7860 * Extensive work on libuv interface
7861 * Much vector code moved to libraries
7862 * Syntax extensions: #line, #col, #file, #mod, #stringify,
7863 #include, #include_str, #include_bin
7866 * Cargo automatically resolves dependencies
7869 Version 0.2 (2012-03-29)
7870 =========================
7872 * >1500 changes, numerous bugfixes
7874 * New docs and doc tooling
7876 * New port: FreeBSD x86_64
7878 * Compilation model enhancements
7879 * Generics now specialized, multiply instantiated
7880 * Functions now inlined across separate crates
7882 * Scheduling, stack and threading fixes
7883 * Noticeably improved message-passing performance
7884 * Explicit schedulers
7888 * Experimental new language features
7889 * Operator overloading
7893 * Various language extensions
7894 * C-callback function types: 'crust fn ...'
7895 * Infinite-loop construct: 'loop { ... }'
7896 * Shorten 'mutable' to 'mut'
7897 * Required mutable-local qualifier: 'let mut ...'
7898 * Basic glob-exporting: 'export foo::*;'
7899 * Alt now exhaustive, 'alt check' for runtime-checked
7900 * Block-function form of 'for' loop, with 'break' and 'ret'.
7903 * AST quasi-quote syntax extension
7904 * Revived libuv interface
7905 * New modules: core::{future, iter}, std::arena
7906 * Merged per-platform std::{os*, fs*} to core::{libc, os}
7907 * Extensive cleanup, regularization in libstd, libcore
7910 Version 0.1 (2012-01-20)
7911 ===============================
7913 * Most language features work, including:
7914 * Unique pointers, unique closures, move semantics
7915 * Interface-constrained generics
7916 * Static interface dispatch
7918 * Multithread task scheduling
7919 * Typestate predicates
7920 * Failure unwinding, destructors
7921 * Pattern matching and destructuring assignment
7922 * Lightweight block-lambda syntax
7923 * Preliminary macro-by-example
7925 * Compiler works with the following configurations:
7926 * Linux: x86 and x86_64 hosts and targets
7927 * macOS: x86 and x86_64 hosts and targets
7928 * Windows: x86 hosts and targets
7930 * Cross compilation / multi-target configuration supported.
7932 * Preliminary API-documentation and package-management tools included.
7936 * Documentation is incomplete.
7938 * Performance is below intended target.
7940 * Standard library APIs are subject to extensive change, reorganization.
7942 * Language-level versioning is not yet operational - future code will