1 Version 1.58.0 (2022-01-13)
2 ==========================
7 - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
8 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
9 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
14 - [Add LLVM CFI support to the Rust compiler][89652]
15 - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
16 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
17 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
18 - [Update the minimum external LLVM to 12][90175]
19 - [Add `x86_64-unknown-none` at Tier 3*][89062]
20 - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
21 - [Don't abort compilation after giving a lint error][87337]
22 - [Error messages point at the source of trait bound obligations in more places][89580]
24 \* Refer to Rust's [platform support page][platform-support-doc] for more
25 information on Rust's tiered platform support.
30 - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
31 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
32 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
33 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
34 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
35 - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
40 - [`Metadata::is_symlink`]
41 - [`Path::is_symlink`]
42 - [`{integer}::saturating_div`]
43 - [`Option::unwrap_unchecked`]
44 - [`NonZero{unsigned}::is_power_of_two`]
46 These APIs are now usable in const contexts:
49 - [`Duration::checked_add`]
50 - [`Duration::saturating_add`]
51 - [`Duration::checked_sub`]
52 - [`Duration::saturating_sub`]
53 - [`Duration::checked_mul`]
54 - [`Duration::saturating_mul`]
55 - [`Duration::checked_div`]
56 - [`MaybeUninit::as_ptr`]
57 - [`MaybeUninit::as_mut_ptr`]
58 - [`MaybeUninit::assume_init`]
59 - [`MaybeUninit::assume_init_ref`]
64 - [Add --message-format for install command][cargo/10107]
65 - [Warn when alias shadows external subcommand][cargo/10082]
70 - [Show all Deref implementations recursively in rustdoc][90183]
71 - [Use computed visibility in rustdoc][88447]
76 - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library.
77 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
78 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
79 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
80 - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc.
81 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
86 These changes provide no direct user facing benefits, but represent significant
87 improvements to the internals and overall performance of rustc
90 - [Implement coherence checks for negative trait impls][90104]
91 - [Add rustc lint, warning when iterating over hashmaps][89558]
92 - [Optimize live point computation][90491]
93 - [Enable verification for 1/32nd of queries loaded from disk][90361]
94 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
96 [87337]: https://github.com/rust-lang/rust/pull/87337/
97 [87467]: https://github.com/rust-lang/rust/pull/87467/
98 [87704]: https://github.com/rust-lang/rust/pull/87704/
99 [88041]: https://github.com/rust-lang/rust/pull/88041/
100 [88300]: https://github.com/rust-lang/rust/pull/88300/
101 [88447]: https://github.com/rust-lang/rust/pull/88447/
102 [88601]: https://github.com/rust-lang/rust/pull/88601/
103 [88624]: https://github.com/rust-lang/rust/pull/88624/
104 [89062]: https://github.com/rust-lang/rust/pull/89062/
105 [89174]: https://github.com/rust-lang/rust/pull/89174/
106 [89542]: https://github.com/rust-lang/rust/pull/89542/
107 [89551]: https://github.com/rust-lang/rust/pull/89551/
108 [89558]: https://github.com/rust-lang/rust/pull/89558/
109 [89580]: https://github.com/rust-lang/rust/pull/89580/
110 [89652]: https://github.com/rust-lang/rust/pull/89652/
111 [89677]: https://github.com/rust-lang/rust/pull/89677/
112 [89951]: https://github.com/rust-lang/rust/pull/89951/
113 [90041]: https://github.com/rust-lang/rust/pull/90041/
114 [90058]: https://github.com/rust-lang/rust/pull/90058/
115 [90104]: https://github.com/rust-lang/rust/pull/90104/
116 [90117]: https://github.com/rust-lang/rust/pull/90117/
117 [90175]: https://github.com/rust-lang/rust/pull/90175/
118 [90183]: https://github.com/rust-lang/rust/pull/90183/
119 [90297]: https://github.com/rust-lang/rust/pull/90297/
120 [90329]: https://github.com/rust-lang/rust/pull/90329/
121 [90361]: https://github.com/rust-lang/rust/pull/90361/
122 [90417]: https://github.com/rust-lang/rust/pull/90417/
123 [90473]: https://github.com/rust-lang/rust/pull/90473/
124 [90491]: https://github.com/rust-lang/rust/pull/90491/
125 [90733]: https://github.com/rust-lang/rust/pull/90733/
126 [90833]: https://github.com/rust-lang/rust/pull/90833/
127 [90846]: https://github.com/rust-lang/rust/pull/90846/
128 [90896]: https://github.com/rust-lang/rust/pull/90896/
129 [91026]: https://github.com/rust-lang/rust/pull/91026/
130 [91207]: https://github.com/rust-lang/rust/pull/91207/
131 [91255]: https://github.com/rust-lang/rust/pull/91255/
132 [91301]: https://github.com/rust-lang/rust/pull/91301/
133 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
134 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
135 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
136 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
137 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
138 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
139 [`NonZero{unsigned}::is_power_of_two`]: https://doc.rust-lang.org/stable/std/num/struct.NonZeroU8.html#method.is_power_of_two
140 [`unix::process::ExitStatusExt::core_dumped`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.core_dumped
141 [`unix::process::ExitStatusExt::stopped_signal`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.stopped_signal
142 [`unix::process::ExitStatusExt::continued`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.continued
143 [`unix::process::ExitStatusExt::into_raw`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.into_raw
144 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
145 [`Duration::checked_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_add
146 [`Duration::saturating_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_add
147 [`Duration::checked_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_sub
148 [`Duration::saturating_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_sub
149 [`Duration::checked_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_mul
150 [`Duration::saturating_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_mul
151 [`Duration::checked_div`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_div
152 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f64
153 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f32
154 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f64
155 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f32
156 [`Duration::mul_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f64
157 [`Duration::mul_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f32
158 [`Duration::div_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f64
159 [`Duration::div_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f32
160 [`Duration::div_duration_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f64
161 [`Duration::div_duration_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f32
162 [`MaybeUninit::as_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
163 [`MaybeUninit::as_mut_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_mut_ptr
164 [`MaybeUninit::assume_init`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
165 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
167 Version 1.57.0 (2021-12-02)
168 ==========================
173 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
174 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
175 - [Allow panicking in constant evaluation.][89508]
180 - [Create more accurate debuginfo for vtables.][89597]
181 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
182 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
183 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
184 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
186 \* Refer to Rust's [platform support page][platform-support-doc] for more
187 information on Rust's tiered platform support.
192 - [Avoid allocations and copying in `Vec::leak`][89337]
193 - [Add `#[repr(i8)]` to `Ordering`][89507]
194 - [Optimize `File::read_to_end` and `read_to_string`][89582]
195 - [Update to Unicode 14.0][89614]
196 - [Many more functions are marked `#[must_use]`][89692], producing a warning
197 when ignoring their return value. This helps catch mistakes such as expecting
198 a function to mutate a value in place rather than return a new value.
203 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
204 - [`[T; N]::as_slice`][`array::as_slice`]
205 - [`collections::TryReserveError`]
206 - [`HashMap::try_reserve`]
207 - [`HashSet::try_reserve`]
208 - [`String::try_reserve`]
209 - [`String::try_reserve_exact`]
210 - [`Vec::try_reserve`]
211 - [`Vec::try_reserve_exact`]
212 - [`VecDeque::try_reserve`]
213 - [`VecDeque::try_reserve_exact`]
214 - [`Iterator::map_while`]
216 - [`proc_macro::is_available`]
217 - [`Command::get_program`]
218 - [`Command::get_args`]
219 - [`Command::get_envs`]
220 - [`Command::get_current_dir`]
224 These APIs are now usable in const contexts:
226 - [`hint::unreachable_unchecked`]
231 - [Stabilize custom profiles][cargo/9943]
238 These changes provide no direct user facing benefits, but represent significant
239 improvements to the internals and overall performance of rustc
242 - [Added an experimental backend for codegen with `libgccjit`.][87260]
244 [86191]: https://github.com/rust-lang/rust/pull/86191/
245 [87220]: https://github.com/rust-lang/rust/pull/87220/
246 [87260]: https://github.com/rust-lang/rust/pull/87260/
247 [88243]: https://github.com/rust-lang/rust/pull/88243/
248 [88321]: https://github.com/rust-lang/rust/pull/88321/
249 [88529]: https://github.com/rust-lang/rust/pull/88529/
250 [88690]: https://github.com/rust-lang/rust/pull/88690/
251 [88952]: https://github.com/rust-lang/rust/pull/88952/
252 [89337]: https://github.com/rust-lang/rust/pull/89337/
253 [89507]: https://github.com/rust-lang/rust/pull/89507/
254 [89508]: https://github.com/rust-lang/rust/pull/89508/
255 [89582]: https://github.com/rust-lang/rust/pull/89582/
256 [89597]: https://github.com/rust-lang/rust/pull/89597/
257 [89614]: https://github.com/rust-lang/rust/pull/89614/
258 [89692]: https://github.com/rust-lang/rust/issues/89692/
259 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
260 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
261 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
262 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
263 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
264 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
265 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
266 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
267 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
268 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
269 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
270 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
271 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
272 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
273 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
274 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
275 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
276 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
277 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
278 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
279 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
281 Version 1.56.1 (2021-11-01)
282 ===========================
284 - New lints to detect the presence of bidirectional-override Unicode
285 codepoints in the compiled source code ([CVE-2021-42574])
287 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
289 Version 1.56.0 (2021-10-21)
290 ========================
295 - [The 2021 Edition is now stable.][rust#88100]
296 See [the edition guide][rust-2021-edition-guide] for more details.
297 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
298 - [Union field access is permitted in `const fn`.][rust#85769]
300 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
305 - [Upgrade to LLVM 13.][rust#87570]
306 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
307 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
308 - [Warnings can be forced on with `--force-warn`.][rust#87472]
309 This feature is primarily intended for usage by `cargo fix`, rather than end users.
310 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
311 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
312 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
314 \* Refer to Rust's [platform support page][platform-support-doc] for more
315 information on Rust's tiered platform support.
320 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
321 The Windows console still requires valid Unicode, but this change allows
322 splitting a UTF-8 character across multiple write calls. This allows, for
323 instance, programs that just read and write data buffers (e.g. copying a file
324 to stdout) without regard for Unicode or character boundaries.
325 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
326 For this use case, atomics scale much better under contention.
327 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
328 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
329 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
330 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
331 - [Treat invalid environment variable names as non-existent.][rust#86183]
332 Previously, the environment functions would panic if given a variable name
333 with an internal null character or equal sign (`=`). Now, these functions will
334 just treat such names as non-existent variables, since the OS cannot represent
335 the existence of a variable with such a name.
340 - [`std::os::unix::fs::chroot`]
341 - [`UnsafeCell::raw_get`]
342 - [`BufWriter::into_parts`]
343 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
344 These APIs were previously stable in `std`, but are now also available in `core`.
346 - [`String::shrink_to`]
347 - [`OsString::shrink_to`]
348 - [`PathBuf::shrink_to`]
349 - [`BinaryHeap::shrink_to`]
350 - [`VecDeque::shrink_to`]
351 - [`HashMap::shrink_to`]
352 - [`HashSet::shrink_to`]
354 These APIs are now usable in const contexts:
356 - [`std::mem::transmute`]
357 - [`[T]::first`][`slice::first`]
358 - [`[T]::split_first`][`slice::split_first`]
359 - [`[T]::last`][`slice::last`]
360 - [`[T]::split_last`][`slice::split_last`]
365 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
366 This has no effect at present on dependency version selection.
367 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
368 that support Rust code to include a crate's specified minimum version in the test matrix for that
374 - [Update to new argument parsing rules on Windows.][rust#87580]
375 This adjusts Rust's standard library to match the behavior of the standard
376 libraries for C/C++. The rules have changed slightly over time, and this PR
377 brings us to the latest set of rules (changed in 2008).
378 - [Disallow the aapcs calling convention on aarch64][rust#88399]
379 This was already not supported by LLVM; this change surfaces this lack of
380 support with a better error message.
381 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
382 - [Warn when an escaped newline skips multiple lines.][rust#87671]
383 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
384 may return different values on glibc <= 2.24.][rust#81825]
385 Rust now invokes the `clone3` system call directly, when available, to use new functionality
386 available via that system call. Older versions of glibc cache the result of `getpid`, and only
387 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
388 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
392 These changes provide no direct user facing benefits, but represent significant
393 improvements to the internals and overall performance of rustc
396 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
397 This improves the performance of most Rust builds.
398 - [Unify representation of macros in internal data structures.][rust#88019]
399 This change fixes a host of bugs with the handling of macros by the compiler,
402 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
403 [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
404 [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
405 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
406 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
407 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
408 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
409 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
410 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
411 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
412 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
413 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
414 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
415 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
416 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
417 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
418 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
419 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
420 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
421 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
422 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
423 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
424 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
425 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
426 [rust#86860]: https://github.com/rust-lang/rust/pull/86860
427 [rust#84039]: https://github.com/rust-lang/rust/pull/84039
428 [rust#86492]: https://github.com/rust-lang/rust/pull/86492
429 [rust#88363]: https://github.com/rust-lang/rust/pull/88363
430 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
431 [rust#87832]: https://github.com/rust-lang/rust/pull/87832
432 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
433 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
434 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
435 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
436 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
437 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
438 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
439 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
440 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
441 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
442 [rust#88177]: https://github.com/rust-lang/rust/pull/88177
443 [rust#88548]: https://github.com/rust-lang/rust/pull/88548
444 [rust#88551]: https://github.com/rust-lang/rust/pull/88551
445 [rust#88299]: https://github.com/rust-lang/rust/pull/88299
446 [rust#88220]: https://github.com/rust-lang/rust/pull/88220
447 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
448 [rust#86879]: https://github.com/rust-lang/rust/pull/86879
449 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
450 [rust#84662]: https://github.com/rust-lang/rust/pull/84662
451 [rust#86593]: https://github.com/rust-lang/rust/pull/86593
452 [rust#81050]: https://github.com/rust-lang/rust/pull/81050
453 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
454 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
455 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
456 [rust#88490]: https://github.com/rust-lang/rust/pull/88490
457 [rust#88269]: https://github.com/rust-lang/rust/pull/88269
458 [rust#84176]: https://github.com/rust-lang/rust/pull/84176
459 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
460 [rust#88227]: https://github.com/rust-lang/rust/pull/88227
461 [rust#88200]: https://github.com/rust-lang/rust/pull/88200
462 [rust#82776]: https://github.com/rust-lang/rust/pull/82776
463 [rust#88077]: https://github.com/rust-lang/rust/pull/88077
464 [rust#87728]: https://github.com/rust-lang/rust/pull/87728
465 [rust#87050]: https://github.com/rust-lang/rust/pull/87050
466 [rust#87619]: https://github.com/rust-lang/rust/pull/87619
467 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
468 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
469 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
471 Version 1.55.0 (2021-09-09)
472 ============================
476 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
477 will end at the maximum value of the integer.][83918]
478 - [You can now explicitly import the prelude of different editions
479 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
483 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
485 \* Refer to Rust's [platform support page][platform-support-doc] for more
486 information on Rust's tiered platform support.
491 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
492 These improvements should in general provide faster string parsing of floats,
493 no longer reject certain valid floating point values, and reduce
494 the produced code size for non-stripped artifacts.
495 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
502 - [`IntoInnerError::into_error`]
503 - [`IntoInnerError::into_parts`]
504 - [`MaybeUninit::assume_init_mut`]
505 - [`MaybeUninit::assume_init_ref`]
506 - [`MaybeUninit::write`]
508 - [`ops::ControlFlow`]
510 - [`x86::_bittestandcomplement`]
511 - [`x86::_bittestandreset`]
512 - [`x86::_bittestandset`]
513 - [`x86_64::_bittest64`]
514 - [`x86_64::_bittestandcomplement64`]
515 - [`x86_64::_bittestandreset64`]
516 - [`x86_64::_bittestandset64`]
518 The following previously stable functions are now `const`.
520 - [`str::from_utf8_unchecked`]
525 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
526 rustc in parallel such as when using `cargo test`.][cargo/9675]
527 - [The package definition in `cargo metadata` now includes the `"default_run"`
528 field from the manifest.][cargo/9550]
529 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
530 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
531 of packages.][cargo/9663]
535 - [Added "Go to item on exact match" search option.][85876]
536 - [The "Implementors" section on traits no longer shows redundant
537 method definitions.][85970]
538 - [Trait implementations are toggled open by default.][86260] This should make the
539 implementations more searchable by tools like `CTRL+F` in your browser.
540 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
541 through type aliases.][86334]
542 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
543 "Trait Implementations" section.][86513]
548 - [std functions that return an `io::Error` will no longer use the
549 `ErrorKind::Other` variant.][85746] This is to better reflect that these
550 kinds of errors could be categorised [into newer more specific `ErrorKind`
551 variants][79965], and that they do not represent a user error.
552 - [Using environment variable names with `process::Command` on Windows now
553 behaves as expected.][85270] Previously using envionment variables with
554 `Command` would cause them to be ASCII-uppercased.
555 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
556 with `rustdoc::`][86849]
557 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
558 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
559 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
562 [86849]: https://github.com/rust-lang/rust/pull/86849
563 [86513]: https://github.com/rust-lang/rust/pull/86513
564 [86334]: https://github.com/rust-lang/rust/pull/86334
565 [86260]: https://github.com/rust-lang/rust/pull/86260
566 [85970]: https://github.com/rust-lang/rust/pull/85970
567 [85876]: https://github.com/rust-lang/rust/pull/85876
568 [83572]: https://github.com/rust-lang/rust/pull/83572
569 [86294]: https://github.com/rust-lang/rust/pull/86294
570 [86858]: https://github.com/rust-lang/rust/pull/86858
571 [86761]: https://github.com/rust-lang/rust/pull/86761
572 [85769]: https://github.com/rust-lang/rust/pull/85769
573 [85746]: https://github.com/rust-lang/rust/pull/85746
574 [85305]: https://github.com/rust-lang/rust/pull/85305
575 [85270]: https://github.com/rust-lang/rust/pull/85270
576 [84111]: https://github.com/rust-lang/rust/pull/84111
577 [83918]: https://github.com/rust-lang/rust/pull/83918
578 [79965]: https://github.com/rust-lang/rust/pull/79965
579 [87370]: https://github.com/rust-lang/rust/pull/87370
580 [87298]: https://github.com/rust-lang/rust/pull/87298
581 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
582 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
583 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
584 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
585 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
586 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
587 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
588 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
589 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
590 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
591 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
592 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
593 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
594 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
595 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
596 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
597 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
598 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
599 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
600 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
601 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
602 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
603 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
604 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
607 Version 1.54.0 (2021-07-29)
608 ============================
611 -----------------------
613 - [You can now use macros for values in some built-in attributes.][83366]
614 This primarily allows you to call macros within the `#[doc]` attribute. For
615 example, to include external documentation in your crate, you can now write
618 #![doc = include_str!("README.md")]
621 - [You can now cast between unsized slice types (and types which contain
622 unsized slices) in `const fn`.][85078]
623 - [You can now use multiple generic lifetimes with `impl Trait` where the
624 lifetimes don't explicitly outlive another.][84701] In code this means
625 that you can now have `impl Trait<'a, 'b>` where as before you could
626 only have `impl Trait<'a, 'b> where 'b: 'a`.
629 -----------------------
631 - [Rustc will now search for custom JSON targets in
632 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
633 directory.][83800] You can find your sysroot directory by running
634 `rustc --print sysroot`.
635 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
636 - [You can now use `#[target_feature]` on safe functions when targeting
637 WebAssembly platforms.][84988]
638 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
639 - [Added tier 3\* support for `bpfel-unknown-none`
640 and `bpfeb-unknown-none`.][79608]
641 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
643 \* Refer to Rust's [platform support page][platform-support-doc] for more
644 information on Rust's tiered platform support.
647 -----------------------
649 - [`panic::panic_any` will now `#[track_caller]`.][85745]
650 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
651 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
652 - [The implementations of vendor intrinsics in core::arch have been
653 significantly refactored.][83278] The main user-visible changes are
654 a 50% reduction in the size of libcore.rlib and stricter validation
655 of constant operands passed to intrinsics. The latter is technically
656 a breaking change, but allows Rust to more closely match the C vendor
662 - [`BTreeMap::into_keys`]
663 - [`BTreeMap::into_values`]
664 - [`HashMap::into_keys`]
665 - [`HashMap::into_values`]
667 - [`VecDeque::binary_search`]
668 - [`VecDeque::binary_search_by`]
669 - [`VecDeque::binary_search_by_key`]
670 - [`VecDeque::partition_point`]
675 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
676 the dependency graph.][cargo/9520]
677 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
678 in the tree ][cargo/9499]
679 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
680 macro dependencies.][cargo/9488]
681 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
682 This variable points to a directory that integration tests and benches
683 can use as a "scratchpad" for testing filesystem operations.
687 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
688 - [Previously unsound code is no longer permitted where different constructors in branches
689 could require different lifetimes.][85574]
690 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
691 than before and may reject some previously accepted code.
692 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
693 when compiled with `codegen-units = 1`.][86063]
695 [85574]: https://github.com/rust-lang/rust/issues/85574
696 [86831]: https://github.com/rust-lang/rust/issues/86831
697 [86063]: https://github.com/rust-lang/rust/issues/86063
698 [86831]: https://github.com/rust-lang/rust/issues/86831
699 [79608]: https://github.com/rust-lang/rust/pull/79608
700 [84988]: https://github.com/rust-lang/rust/pull/84988
701 [84701]: https://github.com/rust-lang/rust/pull/84701
702 [84072]: https://github.com/rust-lang/rust/pull/84072
703 [85745]: https://github.com/rust-lang/rust/pull/85745
704 [84744]: https://github.com/rust-lang/rust/pull/84744
705 [85078]: https://github.com/rust-lang/rust/pull/85078
706 [84717]: https://github.com/rust-lang/rust/pull/84717
707 [83800]: https://github.com/rust-lang/rust/pull/83800
708 [83366]: https://github.com/rust-lang/rust/pull/83366
709 [83278]: https://github.com/rust-lang/rust/pull/83278
710 [85292]: https://github.com/rust-lang/rust/pull/85292
711 [82834]: https://github.com/rust-lang/rust/pull/82834
712 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
713 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
714 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
715 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
716 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
717 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
718 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
719 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
720 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
721 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
722 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
724 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
726 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
728 Version 1.53.0 (2021-06-17)
729 ============================
732 -----------------------
733 - [You can now use unicode for identifiers.][83799] This allows multilingual
734 identifiers but still doesn't allow glyphs that are not considered characters
735 such as `◆` or `🦀`. More specifically you can now use any identifier that
736 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
737 is the same standard as languages like Python, however Rust uses NFC
738 normalization which may be different from other languages.
739 - [You can now specify "or patterns" inside pattern matches.][79278]
740 Previously you could only use `|` (OR) on complete patterns. E.g.
744 matches!(x, Some(1) | Some(2));
746 matches!(x, Some(1 | 2));
748 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
749 has the same semantics as the `:pat` matcher. This is to allow `:pat`
750 to change semantics to being a pattern fragment in a future edition.
753 -----------------------
754 - [Updated the minimum external LLVM version to LLVM 10.][83387]
755 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
756 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
758 \* Refer to Rust's [platform support page][platform-support-doc] for more
759 information on Rust's tiered platform support.
762 -----------------------
763 - [Abort messages will now forward to `android_set_abort_message` on
764 Android platforms when available.][81469]
765 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
766 - [Arrays of any length now implement `IntoIterator`.][84147]
767 Currently calling `.into_iter()` as a method on an array will
768 return `impl Iterator<Item=&T>`, but this may change in a
769 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
770 directly on arrays will provide `impl Iterator<Item=T>` as expected.
771 - [`leading_zeros`, and `trailing_zeros` are now available on all
772 `NonZero` integer types.][84082]
773 - [`{f32, f64}::from_str` now parse and print special values
774 (`NaN`, `-0`) according to IEEE 754.][78618]
775 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
776 - [Add the `BITS` associated constant to all numeric types.][82565]
780 - [`AtomicBool::fetch_update`]
781 - [`AtomicPtr::fetch_update`]
782 - [`BTreeMap::retain`]
783 - [`BTreeSet::retain`]
784 - [`BufReader::seek_relative`]
785 - [`DebugStruct::non_exhaustive`]
788 - [`Duration::is_zero`]
789 - [`Duration::saturating_add`]
790 - [`Duration::saturating_mul`]
791 - [`Duration::saturating_sub`]
792 - [`ErrorKind::Unsupported`]
794 - [`Ordering::is_eq`]
795 - [`Ordering::is_ge`]
796 - [`Ordering::is_gt`]
797 - [`Ordering::is_le`]
798 - [`Ordering::is_lt`]
799 - [`Ordering::is_ne`]
800 - [`OsStr::is_ascii`]
801 - [`OsStr::make_ascii_lowercase`]
802 - [`OsStr::make_ascii_uppercase`]
803 - [`OsStr::to_ascii_lowercase`]
804 - [`OsStr::to_ascii_uppercase`]
805 - [`Peekable::peek_mut`]
806 - [`Rc::decrement_strong_count`]
807 - [`Rc::increment_strong_count`]
808 - [`Vec::extend_from_within`]
809 - [`array::from_mut`]
810 - [`array::from_ref`]
811 - [`cmp::max_by_key`]
813 - [`cmp::min_by_key`]
815 - [`f32::is_subnormal`]
816 - [`f64::is_subnormal`]
819 -----------------------
820 - [Cargo now supports git repositories where the default `HEAD` branch is not
821 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
822 which can handle default branches correctly.
823 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
824 - [The `authors` field is no longer included in `Cargo.toml` for new
825 projects.][cargo/9282]
828 -----------------------
829 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
830 without hyperlinks.][81764]
834 - [Implement token-based handling of attributes during expansion][82608]
835 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
836 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
837 to confusion and potential security vulnerabilities and [is no
838 longer recommended][ietf6943].
839 - [The added `BITS` constant may conflict with external definitions.][85667]
840 In particular, this was known to be a problem in the `lexical-core` crate,
841 but they have published fixes for semantic versions 0.4 through 0.7. To
842 update this dependency alone, use `cargo update -p lexical-core`.
843 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
847 These changes provide no direct user facing benefits, but represent significant
848 improvements to the internals and overall performance of rustc and
851 - [Rework the `std::sys::windows::alloc` implementation.][83065]
852 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
853 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
854 - [Rework rustdoc const type][82873]
856 [85667]: https://github.com/rust-lang/rust/pull/85667
857 [83386]: https://github.com/rust-lang/rust/pull/83386
858 [82771]: https://github.com/rust-lang/rust/pull/82771
859 [84147]: https://github.com/rust-lang/rust/pull/84147
860 [84082]: https://github.com/rust-lang/rust/pull/84082
861 [83799]: https://github.com/rust-lang/rust/pull/83799
862 [83681]: https://github.com/rust-lang/rust/pull/83681
863 [83652]: https://github.com/rust-lang/rust/pull/83652
864 [83387]: https://github.com/rust-lang/rust/pull/83387
865 [82873]: https://github.com/rust-lang/rust/pull/82873
866 [82864]: https://github.com/rust-lang/rust/pull/82864
867 [82608]: https://github.com/rust-lang/rust/pull/82608
868 [82565]: https://github.com/rust-lang/rust/pull/82565
869 [80525]: https://github.com/rust-lang/rust/pull/80525
870 [79278]: https://github.com/rust-lang/rust/pull/79278
871 [78618]: https://github.com/rust-lang/rust/pull/78618
872 [77704]: https://github.com/rust-lang/rust/pull/77704
873 [83941]: https://github.com/rust-lang/rust/pull/83941
874 [83065]: https://github.com/rust-lang/rust/pull/83065
875 [81764]: https://github.com/rust-lang/rust/pull/81764
876 [81469]: https://github.com/rust-lang/rust/pull/81469
877 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
878 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
879 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
880 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
881 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
882 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
883 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
884 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
885 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
886 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
887 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
888 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
889 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
890 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
891 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
892 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
893 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
894 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
895 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
896 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
897 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
898 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
899 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
900 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
901 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
902 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
903 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
904 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
905 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
906 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
907 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
908 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
909 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
910 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
911 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
912 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
913 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
914 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
915 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
916 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
917 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
918 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
921 Version 1.52.1 (2021-05-10)
922 ============================
924 This release disables incremental compilation, unless the user has explicitly
925 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
927 This is due to the widespread, and frequently occuring, breakage encountered by
928 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
929 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
930 newly added incremental verification are still present in past stable versions,
931 and are not yet fixed on any channel. These bugs can lead to miscompilation of
934 These problems only affect incremental builds, so release builds with Cargo
935 should not be affected unless the user has explicitly opted into incremental.
936 Debug and check builds are affected.
938 See [84970] for more details.
940 [84970]: https://github.com/rust-lang/rust/issues/84970
942 Version 1.52.0 (2021-05-06)
943 ============================
947 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
948 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
949 is allowed by default, and may become a warning or hard error in a
951 - [You can now cast mutable references to arrays to a pointer of the same type as
956 - [Upgraded the default LLVM to LLVM 12.][81451]
958 Added tier 3\* support for the following targets.
960 - [`s390x-unknown-linux-musl`][82166]
961 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
962 - [`powerpc-unknown-openbsd`][82733]
964 \* Refer to Rust's [platform support page][platform-support-doc] for more
965 information on Rust's tiered platform support.
969 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
970 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
971 - [`Arc<impl Error>` now implements `error::Error`.][80553]
972 - [All integer division and remainder operations are now `const`.][80962]
976 - [`Arguments::as_str`]
978 - [`char::REPLACEMENT_CHARACTER`]
979 - [`char::UNICODE_VERSION`]
980 - [`char::decode_utf16`]
981 - [`char::from_digit`]
982 - [`char::from_u32_unchecked`]
984 - [`slice::partition_point`]
985 - [`str::rsplit_once`]
986 - [`str::split_once`]
988 The following previously stable APIs are now `const`.
991 - [`char::len_utf16`]
992 - [`char::to_ascii_uppercase`]
993 - [`char::to_ascii_lowercase`]
994 - [`char::eq_ignore_ascii_case`]
995 - [`u8::to_ascii_uppercase`]
996 - [`u8::to_ascii_lowercase`]
997 - [`u8::eq_ignore_ascii_case`]
1001 - [Rustdoc lints are now treated as a tool lint, meaning that
1002 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1003 Using the old style is still allowed, and will become a warning in
1005 - [Rustdoc now supports argument files.][82261]
1006 - [Rustdoc now generates smart punctuation for documentation.][79423]
1007 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1015 - [You can now pass multiple filters to tests.][81356] E.g.
1016 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1017 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1018 allowing you to see `std` symbols when debugging.][82218]
1022 These changes provide no direct user facing benefits, but represent significant
1023 improvements to the internals and overall performance of rustc and
1026 - [Check the result cache before the DepGraph when ensuring queries][81855]
1027 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1028 - [Only store a LocalDefId in some HIR nodes][81611]
1029 - [Store HIR attributes in a side table][79519]
1033 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1034 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1035 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1036 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1037 languages in code blocks.][78429]
1038 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1039 - [Changes in how proc macros handle whitespace may lead to panics when used
1040 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1041 - [Turn `#[derive]` into a regular macro attribute][79078]
1043 [84136]: https://github.com/rust-lang/rust/issues/84136
1044 [80763]: https://github.com/rust-lang/rust/pull/80763
1045 [82166]: https://github.com/rust-lang/rust/pull/82166
1046 [82121]: https://github.com/rust-lang/rust/pull/82121
1047 [81879]: https://github.com/rust-lang/rust/pull/81879
1048 [82261]: https://github.com/rust-lang/rust/pull/82261
1049 [82218]: https://github.com/rust-lang/rust/pull/82218
1050 [82216]: https://github.com/rust-lang/rust/pull/82216
1051 [82202]: https://github.com/rust-lang/rust/pull/82202
1052 [81855]: https://github.com/rust-lang/rust/pull/81855
1053 [81766]: https://github.com/rust-lang/rust/pull/81766
1054 [81744]: https://github.com/rust-lang/rust/pull/81744
1055 [81611]: https://github.com/rust-lang/rust/pull/81611
1056 [81479]: https://github.com/rust-lang/rust/pull/81479
1057 [81451]: https://github.com/rust-lang/rust/pull/81451
1058 [81356]: https://github.com/rust-lang/rust/pull/81356
1059 [80962]: https://github.com/rust-lang/rust/pull/80962
1060 [80553]: https://github.com/rust-lang/rust/pull/80553
1061 [80527]: https://github.com/rust-lang/rust/pull/80527
1062 [79519]: https://github.com/rust-lang/rust/pull/79519
1063 [79423]: https://github.com/rust-lang/rust/pull/79423
1064 [79208]: https://github.com/rust-lang/rust/pull/79208
1065 [78429]: https://github.com/rust-lang/rust/pull/78429
1066 [82733]: https://github.com/rust-lang/rust/pull/82733
1067 [82594]: https://github.com/rust-lang/rust/pull/82594
1068 [79078]: https://github.com/rust-lang/rust/pull/79078
1069 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1070 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1071 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1072 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1073 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1074 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1075 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1076 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1077 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1078 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1079 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1080 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1081 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1082 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1083 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1084 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1085 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1086 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1087 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1088 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1089 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1090 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1092 Version 1.51.0 (2021-03-25)
1093 ============================
1097 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1098 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1099 E.g. you can now write the following. Note: Only values of primitive integers,
1100 `bool`, or `char` types are currently permitted.
1102 struct GenericArray<T, const LENGTH: usize> {
1106 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1107 const fn last(&self) -> Option<&T> {
1111 Some(&self.inner[LENGTH - 1])
1121 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1122 This option controls whether debug information is split across multiple files
1123 or packed into a single file. **Note** This option is unstable on other platforms.
1124 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1125 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1126 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1127 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1129 \* Refer to Rust's [platform support page][platform-support-doc] for more
1130 information on Rust's tiered platform support.
1135 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1136 - [`str` now implements `AsMut<str>`.][80279]
1137 - [`u64` and `u128` now implement `From<char>`.][79502]
1138 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1139 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1140 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1141 - [`io::Empty` now implements `io::Seek`.][78044]
1142 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1143 `T: ?Sized` types.][80764]
1144 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1150 - [`Arc::decrement_strong_count`]
1151 - [`Arc::increment_strong_count`]
1152 - [`Once::call_once_force`]
1153 - [`Peekable::next_if_eq`]
1154 - [`Peekable::next_if`]
1155 - [`Seek::stream_position`]
1156 - [`array::IntoIter`]
1157 - [`panic::panic_any`]
1159 - [`ptr::addr_of_mut!`]
1160 - [`slice::fill_with`]
1161 - [`slice::split_inclusive_mut`]
1162 - [`slice::split_inclusive`]
1163 - [`slice::strip_prefix`]
1164 - [`slice::strip_suffix`]
1165 - [`str::split_inclusive`]
1166 - [`sync::OnceState`]
1168 - [`VecDeque::range`]
1169 - [`VecDeque::range_mut`]
1173 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1174 codegen option.][cargo/9112]
1175 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1176 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1177 to avoid unifying features of dependencies where that unification could be unwanted.
1178 Such as using the same dependency with a `std` feature in a build scripts and
1179 proc-macros, while using the `no-std` feature in the final binary. See the
1180 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1185 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1186 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1187 documentation.][79642]
1189 Various improvements to intra-doc links:
1191 - [You can link to non-path primitives such as `slice`.][80181]
1192 - [You can link to associated items.][74489]
1193 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1197 - [You can now pass `--include-ignored` to tests (e.g. with
1198 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1203 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1204 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1206 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1207 for the distributed artifacts.][81521]
1208 - `armv5te-unknown-linux-gnueabi`
1209 - `sparc64-unknown-linux-gnu`
1210 - `thumbv7neon-unknown-linux-gnueabihf`
1211 - `armv7-unknown-linux-gnueabi`
1212 - `x86_64-unknown-linux-gnux32`
1213 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1218 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1220 [79135]: https://github.com/rust-lang/rust/pull/79135
1221 [74489]: https://github.com/rust-lang/rust/pull/74489
1222 [76934]: https://github.com/rust-lang/rust/pull/76934
1223 [79570]: https://github.com/rust-lang/rust/pull/79570
1224 [80181]: https://github.com/rust-lang/rust/pull/80181
1225 [79642]: https://github.com/rust-lang/rust/pull/79642
1226 [80945]: https://github.com/rust-lang/rust/pull/80945
1227 [80279]: https://github.com/rust-lang/rust/pull/80279
1228 [80053]: https://github.com/rust-lang/rust/pull/80053
1229 [79502]: https://github.com/rust-lang/rust/pull/79502
1230 [75180]: https://github.com/rust-lang/rust/pull/75180
1231 [79135]: https://github.com/rust-lang/rust/pull/79135
1232 [81521]: https://github.com/rust-lang/rust/pull/81521
1233 [80968]: https://github.com/rust-lang/rust/pull/80968
1234 [80959]: https://github.com/rust-lang/rust/pull/80959
1235 [80718]: https://github.com/rust-lang/rust/pull/80718
1236 [80653]: https://github.com/rust-lang/rust/pull/80653
1237 [80579]: https://github.com/rust-lang/rust/pull/80579
1238 [79998]: https://github.com/rust-lang/rust/pull/79998
1239 [78044]: https://github.com/rust-lang/rust/pull/78044
1240 [81455]: https://github.com/rust-lang/rust/pull/81455
1241 [80764]: https://github.com/rust-lang/rust/pull/80764
1242 [80749]: https://github.com/rust-lang/rust/pull/80749
1243 [80662]: https://github.com/rust-lang/rust/pull/80662
1244 [79134]: https://github.com/rust-lang/rust/pull/79134
1245 [80966]: https://github.com/rust-lang/rust/pull/80966
1246 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1247 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1248 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1249 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1250 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1251 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1252 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1253 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1254 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1255 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1256 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1257 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1258 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1259 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1260 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1261 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1262 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1263 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1264 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1265 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1266 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1267 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1268 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1270 Version 1.50.0 (2021-02-11)
1271 ============================
1274 -----------------------
1275 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1276 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1277 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1280 -----------------------
1281 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1282 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1283 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1284 - [Dropped support for all cloudabi targets.][78439]
1286 \* Refer to Rust's [platform support page][platform-support-doc] for more
1287 information on Rust's tiered platform support.
1290 -----------------------
1292 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1293 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1294 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1295 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1296 up the same amount of space as `File`.
1302 - [`btree_map::Entry::or_insert_with_key`]
1305 - [`hash_map::Entry::or_insert_with_key`]
1309 - [`UnsafeCell::get_mut`]
1311 The following previously stable methods are now `const`.
1313 - [`IpAddr::is_ipv4`]
1314 - [`IpAddr::is_ipv6`]
1315 - [`IpAddr::is_unspecified`]
1316 - [`IpAddr::is_loopback`]
1317 - [`IpAddr::is_multicast`]
1318 - [`Ipv4Addr::octets`]
1319 - [`Ipv4Addr::is_loopback`]
1320 - [`Ipv4Addr::is_private`]
1321 - [`Ipv4Addr::is_link_local`]
1322 - [`Ipv4Addr::is_multicast`]
1323 - [`Ipv4Addr::is_broadcast`]
1324 - [`Ipv4Addr::is_documentation`]
1325 - [`Ipv4Addr::to_ipv6_compatible`]
1326 - [`Ipv4Addr::to_ipv6_mapped`]
1327 - [`Ipv6Addr::segments`]
1328 - [`Ipv6Addr::is_unspecified`]
1329 - [`Ipv6Addr::is_loopback`]
1330 - [`Ipv6Addr::is_multicast`]
1331 - [`Ipv6Addr::to_ipv4`]
1334 - [`Layout::from_size_align`]
1335 - `pow` for all integer types.
1336 - `checked_pow` for all integer types.
1337 - `saturating_pow` for all integer types.
1338 - `wrapping_pow` for all integer types.
1339 - `next_power_of_two` for all unsigned integer types.
1340 - `checked_next_power_of_two` for all unsigned integer types.
1343 -----------------------
1345 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1346 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1347 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1348 contents of that directory for changes.][cargo/8973]
1349 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1354 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1355 - [Running tests will now print the total time taken to execute.][75752]
1360 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1361 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1362 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1363 unhygenic `macro_rules!` macros.][79472]
1364 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1365 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1366 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1367 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1368 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1369 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1371 [74989]: https://github.com/rust-lang/rust/pull/74989
1372 [79261]: https://github.com/rust-lang/rust/pull/79261
1373 [79896]: https://github.com/rust-lang/rust/pull/79896
1374 [79484]: https://github.com/rust-lang/rust/pull/79484
1375 [79472]: https://github.com/rust-lang/rust/pull/79472
1376 [79270]: https://github.com/rust-lang/rust/pull/79270
1377 [79003]: https://github.com/rust-lang/rust/pull/79003
1378 [78864]: https://github.com/rust-lang/rust/pull/78864
1379 [78636]: https://github.com/rust-lang/rust/pull/78636
1380 [78439]: https://github.com/rust-lang/rust/pull/78439
1381 [78343]: https://github.com/rust-lang/rust/pull/78343
1382 [78296]: https://github.com/rust-lang/rust/pull/78296
1383 [78068]: https://github.com/rust-lang/rust/pull/78068
1384 [75752]: https://github.com/rust-lang/rust/pull/75752
1385 [74699]: https://github.com/rust-lang/rust/pull/74699
1386 [78142]: https://github.com/rust-lang/rust/pull/78142
1387 [77484]: https://github.com/rust-lang/rust/pull/77484
1388 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1389 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1390 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1391 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1392 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1393 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1394 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1395 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1396 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1397 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1398 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1399 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1400 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1401 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1402 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1403 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1404 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1405 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1406 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1407 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1408 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1409 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1410 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1411 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1412 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1413 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1414 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1415 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1416 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1417 [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
1418 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1419 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1420 [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
1421 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1424 Version 1.49.0 (2020-12-31)
1425 ============================
1428 -----------------------
1430 - [Unions can now implement `Drop`, and you can now have a field in a union
1431 with `ManuallyDrop<T>`.][77547]
1432 - [You can now cast uninhabited enums to integers.][76199]
1433 - [You can now bind by reference and by move in patterns.][76119] This
1434 allows you to selectively borrow individual components of a type. E.g.
1442 let person = Person {
1443 name: String::from("Alice"),
1447 // `name` is moved out of person, but `age` is referenced.
1448 let Person { name, ref age } = person;
1449 println!("{} {}", name, age);
1453 -----------------------
1455 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1456 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1457 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1458 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1459 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1460 - [Output from threads spawned in tests is now captured.][78227]
1461 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1463 \* Refer to Rust's [platform support page][platform-support-doc] for more
1464 information on Rust's tiered platform support.
1467 -----------------------
1469 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1470 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1475 - [`slice::select_nth_unstable`]
1476 - [`slice::select_nth_unstable_by`]
1477 - [`slice::select_nth_unstable_by_key`]
1479 The following previously stable methods are now `const`.
1481 - [`Poll::is_ready`]
1482 - [`Poll::is_pending`]
1485 -----------------------
1486 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1487 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1488 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1489 variable will be set if the crate being built is one the user selected to build, either
1490 with `-p` or through defaults.
1491 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1497 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1498 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1499 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1500 Previously such invalid or unused attributes could be ignored.
1501 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1502 read [this post about the changes][rustdoc-ws-post] for more details.
1503 - [Trait bounds are no longer inferred for associated types.][79904]
1507 These changes provide no direct user facing benefits, but represent significant
1508 improvements to the internals and overall performance of rustc and
1511 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1512 Local Storage model.][78201]
1513 - [Calculate visibilities once in resolve.][78077]
1514 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1515 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1518 [75991]: https://github.com/rust-lang/rust/pull/75991
1519 [78951]: https://github.com/rust-lang/rust/pull/78951
1520 [78848]: https://github.com/rust-lang/rust/pull/78848
1521 [78746]: https://github.com/rust-lang/rust/pull/78746
1522 [78376]: https://github.com/rust-lang/rust/pull/78376
1523 [78228]: https://github.com/rust-lang/rust/pull/78228
1524 [78227]: https://github.com/rust-lang/rust/pull/78227
1525 [78201]: https://github.com/rust-lang/rust/pull/78201
1526 [78109]: https://github.com/rust-lang/rust/pull/78109
1527 [78077]: https://github.com/rust-lang/rust/pull/78077
1528 [77997]: https://github.com/rust-lang/rust/pull/77997
1529 [77703]: https://github.com/rust-lang/rust/pull/77703
1530 [77547]: https://github.com/rust-lang/rust/pull/77547
1531 [77015]: https://github.com/rust-lang/rust/pull/77015
1532 [76199]: https://github.com/rust-lang/rust/pull/76199
1533 [76119]: https://github.com/rust-lang/rust/pull/76119
1534 [75914]: https://github.com/rust-lang/rust/pull/75914
1535 [79004]: https://github.com/rust-lang/rust/pull/79004
1536 [78676]: https://github.com/rust-lang/rust/pull/78676
1537 [79904]: https://github.com/rust-lang/rust/issues/79904
1538 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1539 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1540 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1541 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1542 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1543 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1544 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1545 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1546 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1547 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1548 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1550 Version 1.48.0 (2020-11-19)
1551 ==========================
1556 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1557 is still rejected *semantically*, but can now be parsed by procedural macros.
1561 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1562 `rustc` whether to link its own C runtime and libraries or to rely on a external
1563 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1564 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1565 Note: If you're using cargo you must explicitly pass the `--target` flag.
1566 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1568 \* Refer to Rust's [platform support page][platform-support-doc] for more
1569 information on Rust's tiered platform support.
1573 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1574 and `&Stderr`.][76275]
1575 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1576 - [The `matches!` macro now supports having a trailing comma.][74880]
1577 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1578 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1582 - [`slice::as_ptr_range`]
1583 - [`slice::as_mut_ptr_range`]
1584 - [`VecDeque::make_contiguous`]
1585 - [`future::pending`]
1588 The following previously stable methods are now `const fn`'s:
1590 - [`Option::is_some`]
1591 - [`Option::is_none`]
1592 - [`Option::as_ref`]
1594 - [`Result::is_err`]
1595 - [`Result::as_ref`]
1596 - [`Ordering::reverse`]
1597 - [`Ordering::then`]
1604 - [You can now link to items in `rustdoc` using the intra-doc link
1605 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1606 a link to `std::future`'s documentation. See ["Linking to items by
1607 name"][intradoc-links] for more information.
1608 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1609 when searching through `rustdoc`'s UI.][75740]
1613 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1614 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1615 promoted to `'static` lifetime any more inside `const fn`s.
1616 - [Associated type bindings on trait objects are now verified to meet the bounds
1617 declared on the trait when checking that they implement the trait.][27675]
1618 - [When trait bounds on associated types or opaque types are ambiguous, the
1619 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1620 - [Fixed recursive nonterminals not being expanded in macros during
1621 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1622 correctly handling recursive nonterminal tokens.
1623 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1624 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1625 in places where they have no effect.][73461]
1626 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1627 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1628 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1629 disallow zero-initialization.][71274]
1630 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1631 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1632 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1633 see the [`catch_unwind`] documentation for further information.
1639 These changes provide no direct user facing benefits, but represent significant
1640 improvements to the internals and overall performance of rustc and
1643 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1644 You can continue building with `make` by setting `ninja=false` in
1646 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1647 - [Made `ensure_sufficient_stack()` non-generic][76680]
1649 [78143]: https://github.com/rust-lang/rust/issues/78143
1650 [76680]: https://github.com/rust-lang/rust/pull/76680/
1651 [76030]: https://github.com/rust-lang/rust/pull/76030/
1652 [70212]: https://github.com/rust-lang/rust/pull/70212/
1653 [27675]: https://github.com/rust-lang/rust/issues/27675/
1654 [54121]: https://github.com/rust-lang/rust/issues/54121/
1655 [71274]: https://github.com/rust-lang/rust/pull/71274/
1656 [77386]: https://github.com/rust-lang/rust/pull/77386/
1657 [77153]: https://github.com/rust-lang/rust/pull/77153/
1658 [77055]: https://github.com/rust-lang/rust/pull/77055/
1659 [76275]: https://github.com/rust-lang/rust/pull/76275/
1660 [76310]: https://github.com/rust-lang/rust/pull/76310/
1661 [76420]: https://github.com/rust-lang/rust/pull/76420/
1662 [76158]: https://github.com/rust-lang/rust/pull/76158/
1663 [75857]: https://github.com/rust-lang/rust/pull/75857/
1664 [75585]: https://github.com/rust-lang/rust/pull/75585/
1665 [75740]: https://github.com/rust-lang/rust/pull/75740/
1666 [75502]: https://github.com/rust-lang/rust/pull/75502/
1667 [74880]: https://github.com/rust-lang/rust/pull/74880/
1668 [74922]: https://github.com/rust-lang/rust/pull/74922/
1669 [74430]: https://github.com/rust-lang/rust/pull/74430/
1670 [74194]: https://github.com/rust-lang/rust/pull/74194/
1671 [73461]: https://github.com/rust-lang/rust/pull/73461/
1672 [73166]: https://github.com/rust-lang/rust/pull/73166/
1673 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1674 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1675 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1676 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1677 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1678 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1679 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1680 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1681 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1682 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1683 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1684 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1685 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1686 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1687 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1690 Version 1.47.0 (2020-10-08)
1691 ==========================
1695 - [Closures will now warn when not used.][74869]
1699 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1700 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1702 - [Upgraded to LLVM 11.][73526]
1703 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1704 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1705 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1707 \* Refer to Rust's [platform support page][platform-support-doc] for more
1708 information on Rust's tiered platform support.
1712 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1713 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1714 those of length less than 33.][74060]
1715 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1716 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1717 `PartialEq`, and `PartialOrd`.][73583]
1721 - [`Ident::new_raw`]
1722 - [`Range::is_empty`]
1723 - [`RangeInclusive::is_empty`]
1724 - [`Result::as_deref`]
1725 - [`Result::as_deref_mut`]
1727 - [`pointer::offset_from`]
1731 The following previously stable APIs have now been made const.
1733 - [The `new` method for all `NonZero` integers.][73858]
1734 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1735 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1736 methods for all integers.][73858]
1737 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1738 signed integers.][73858]
1739 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1740 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1741 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1742 `is_ascii_control` methods for `char` and `u8`.][73858]
1746 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1747 You can override this by setting the following in your `Cargo.toml`.
1749 [profile.release.build-override]
1752 - [`cargo-help` will now display man pages for commands rather just the
1753 `--help` text.][cargo/8456]
1754 - [`cargo-metadata` now emits a `test` field indicating if a target has
1755 tests enabled.][cargo/8478]
1756 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1757 - [`cargo-publish` will now use an alternative registry by default if it's the
1758 only registry specified in `package.publish`.][cargo/8571]
1762 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1763 type based search.][75366]
1764 - [Added the Ayu theme to rustdoc.][71237]
1768 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1769 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1770 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1771 help to preserve more span information.][73084] These changes may cause
1772 compiliation errors if your macro was unhygenic or didn't correctly handle
1774 - [Moved support for the CloudABI target to tier 3.][75568]
1775 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1776 - [Added the `rustc-docs` component.][75560] This allows you to install
1777 and read the documentation for the compiler internal APIs. (Currently only
1778 available for `x86_64-unknown-linux-gnu`.)
1783 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
1785 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1786 [75048]: https://github.com/rust-lang/rust/pull/75048/
1787 [74163]: https://github.com/rust-lang/rust/pull/74163/
1788 [71237]: https://github.com/rust-lang/rust/pull/71237/
1789 [74869]: https://github.com/rust-lang/rust/pull/74869/
1790 [73858]: https://github.com/rust-lang/rust/pull/73858/
1791 [75716]: https://github.com/rust-lang/rust/pull/75716/
1792 [75908]: https://github.com/rust-lang/rust/pull/75908/
1793 [75516]: https://github.com/rust-lang/rust/pull/75516/
1794 [75560]: https://github.com/rust-lang/rust/pull/75560/
1795 [75568]: https://github.com/rust-lang/rust/pull/75568/
1796 [75366]: https://github.com/rust-lang/rust/pull/75366/
1797 [75204]: https://github.com/rust-lang/rust/pull/75204/
1798 [74650]: https://github.com/rust-lang/rust/pull/74650/
1799 [74419]: https://github.com/rust-lang/rust/pull/74419/
1800 [73964]: https://github.com/rust-lang/rust/pull/73964/
1801 [74021]: https://github.com/rust-lang/rust/pull/74021/
1802 [74060]: https://github.com/rust-lang/rust/pull/74060/
1803 [73893]: https://github.com/rust-lang/rust/pull/73893/
1804 [73526]: https://github.com/rust-lang/rust/pull/73526/
1805 [73583]: https://github.com/rust-lang/rust/pull/73583/
1806 [73084]: https://github.com/rust-lang/rust/pull/73084/
1807 [73197]: https://github.com/rust-lang/rust/pull/73197/
1808 [72488]: https://github.com/rust-lang/rust/pull/72488/
1809 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1810 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1811 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1812 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1813 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1814 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1815 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1816 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1817 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1818 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1819 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1820 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1821 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1822 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1823 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1826 Version 1.46.0 (2020-08-27)
1827 ==========================
1831 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1832 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1833 const functions.][73862]
1834 - [The `#[track_caller]` attribute can now be added to functions to use the
1835 function's caller's location information for panic messages.][72445]
1836 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1837 `x.0.0` over `(x.0).0`.
1838 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1839 You currently can't use `mem::transmute` in constant functions.
1843 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1844 - [Enabled static "Position Independent Executables" by default
1845 for `x86_64-unknown-linux-musl`.][70740]
1849 - [`mem::forget` is now a `const fn`.][73887]
1850 - [`String` now implements `From<char>`.][73466]
1851 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1852 integer types.][73032]
1853 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1854 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1855 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1856 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1857 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1858 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1863 - [`vec::Drain::as_slice`]
1867 Added a number of new environment variables that are now available when
1868 compiling your crate.
1870 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1871 the specific binary being compiled and the name of the crate.
1872 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1873 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1877 - [The target configuration option `abi_blacklist` has been renamed
1878 to `unsupported_abis`.][74150] The old name will still continue to work.
1879 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1880 This was previously accepted but will become a hard error in a future release.
1881 - [Rustc will fail to compile if you have a struct with
1882 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1884 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1885 ensure that spans have the correct information, and may cause breakage if you
1886 were relying on receiving spans with dummy information.
1887 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1888 a legacy installer that was replaced by a MSI installer a few years ago but
1889 was still being built.
1890 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1891 - [Rustc will no longer accept overlapping trait implementations that only
1892 differ in how the lifetime was bound.][72493]
1893 - [Rustc now correctly relates the lifetime of an existential associated
1894 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1895 you to pass a shorter lifetime than expected.
1896 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1897 The library will need to be installed for `rustc` to work, even though we
1898 expect it to be already available on most systems.
1899 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1901 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1902 exact output returned by rustc's pretty printing is an unstable
1903 implementation detail: we recommend any macro relying on it to switch to a
1904 more robust parsing system.
1906 [75453]: https://github.com/rust-lang/rust/issues/75453/
1907 [74820]: https://github.com/rust-lang/rust/issues/74820/
1908 [74420]: https://github.com/rust-lang/rust/issues/74420/
1909 [74109]: https://github.com/rust-lang/rust/pull/74109/
1910 [74150]: https://github.com/rust-lang/rust/pull/74150/
1911 [73862]: https://github.com/rust-lang/rust/pull/73862/
1912 [73887]: https://github.com/rust-lang/rust/pull/73887/
1913 [73466]: https://github.com/rust-lang/rust/pull/73466/
1914 [73516]: https://github.com/rust-lang/rust/pull/73516/
1915 [73293]: https://github.com/rust-lang/rust/pull/73293/
1916 [73007]: https://github.com/rust-lang/rust/pull/73007/
1917 [73032]: https://github.com/rust-lang/rust/pull/73032/
1918 [72920]: https://github.com/rust-lang/rust/pull/72920/
1919 [72569]: https://github.com/rust-lang/rust/pull/72569/
1920 [72583]: https://github.com/rust-lang/rust/pull/72583/
1921 [72584]: https://github.com/rust-lang/rust/pull/72584/
1922 [72717]: https://github.com/rust-lang/rust/pull/72717/
1923 [72437]: https://github.com/rust-lang/rust/pull/72437/
1924 [72445]: https://github.com/rust-lang/rust/pull/72445/
1925 [72486]: https://github.com/rust-lang/rust/pull/72486/
1926 [72493]: https://github.com/rust-lang/rust/pull/72493/
1927 [72331]: https://github.com/rust-lang/rust/pull/72331/
1928 [71896]: https://github.com/rust-lang/rust/pull/71896/
1929 [71660]: https://github.com/rust-lang/rust/pull/71660/
1930 [71322]: https://github.com/rust-lang/rust/pull/71322/
1931 [70740]: https://github.com/rust-lang/rust/pull/70740/
1932 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1933 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1934 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1935 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1936 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1939 Version 1.45.2 (2020-08-03)
1940 ==========================
1942 * [Fix bindings in tuple struct patterns][74954]
1943 * [Fix track_caller integration with trait objects][74784]
1945 [74954]: https://github.com/rust-lang/rust/issues/74954
1946 [74784]: https://github.com/rust-lang/rust/issues/74784
1949 Version 1.45.1 (2020-07-30)
1950 ==========================
1952 * [Fix const propagation with references.][73613]
1953 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1954 * [Avoid spurious implicit region bound.][74509]
1955 * [Install clippy on x.py install][74457]
1957 [73613]: https://github.com/rust-lang/rust/pull/73613
1958 [73078]: https://github.com/rust-lang/rust/issues/73078
1959 [74509]: https://github.com/rust-lang/rust/pull/74509
1960 [74457]: https://github.com/rust-lang/rust/pull/74457
1963 Version 1.45.0 (2020-07-16)
1964 ==========================
1968 - [Out of range float to int conversions using `as` has been defined as a saturating
1969 conversion.][71269] This was previously undefined behaviour, but you can use the
1970 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1971 may be desirable in rare performance sensitive situations.
1972 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1973 using `u64`.][70705]
1974 - [Function like procedural macros can now be used in expression, pattern, and statement
1975 positions.][68717] This means you can now use a function-like procedural macro
1976 anywhere you can use a declarative (`macro_rules!`) macro.
1980 - [You can now override individual target features through the `target-feature`
1981 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1982 equivalent to `-C target-feature=+avx2,+fma`.
1983 - [Added the `force-unwind-tables` flag.][69984] This option allows
1984 rustc to always generate unwind tables regardless of panic strategy.
1985 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1986 to include LLVM bitcode into generated `rlib`s (this is on by default).
1987 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1988 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1989 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1990 - [Upgraded to LLVM 10.][67759]
1992 \* Refer to Rust's [platform support page][platform-support-doc] for more
1993 information on Rust's tiered platform support.
1998 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2000 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2001 - [You can now use `char` with
2002 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2003 a range of codepoints.][72413] E.g.
2004 you can now write the following;
2006 for ch in 'a'..='z' {
2010 // Prints "abcdefghijklmnopqrstuvwxyz"
2012 - [`OsString` now implements `FromStr`.][71662]
2013 - [The `saturating_neg` method has been added to all signed integer primitive
2014 types, and the `saturating_abs` method has been added for all integer
2015 primitive types.][71886]
2016 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2017 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2019 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2020 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2021 integer types.][69813]
2022 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2023 integer types.][72324]
2024 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2029 - [`BTreeMap::remove_entry`]
2031 - [`rc::Weak::as_ptr`]
2032 - [`rc::Weak::from_raw`]
2033 - [`rc::Weak::into_raw`]
2034 - [`str::strip_prefix`]
2035 - [`str::strip_suffix`]
2036 - [`sync::Weak::as_ptr`]
2037 - [`sync::Weak::from_raw`]
2038 - [`sync::Weak::into_raw`]
2039 - [`char::UNICODE_VERSION`]
2040 - [`Span::resolved_at`]
2041 - [`Span::located_at`]
2042 - [`Span::mixed_site`]
2043 - [`unix::process::CommandExt::arg0`]
2048 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2053 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2054 `~~outdated information~~` becomes "~~outdated information~~".
2055 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2059 - [Trying to self initialize a static value (that is creating a value using
2060 itself) is unsound and now causes a compile error.][71140]
2061 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2062 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2063 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2064 previously undocumented and not intended for public use. Rustdoc still provides
2065 a non-zero exit code on errors.
2066 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2067 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2068 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2069 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2070 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2074 - [Make clippy a git subtree instead of a git submodule][70655]
2075 - [Unify the undo log of all snapshot types][69464]
2077 [71848]: https://github.com/rust-lang/rust/issues/71848/
2078 [73420]: https://github.com/rust-lang/rust/issues/73420/
2079 [72324]: https://github.com/rust-lang/rust/pull/72324/
2080 [71843]: https://github.com/rust-lang/rust/pull/71843/
2081 [71886]: https://github.com/rust-lang/rust/pull/71886/
2082 [72234]: https://github.com/rust-lang/rust/pull/72234/
2083 [72239]: https://github.com/rust-lang/rust/pull/72239/
2084 [72397]: https://github.com/rust-lang/rust/pull/72397/
2085 [72413]: https://github.com/rust-lang/rust/pull/72413/
2086 [72014]: https://github.com/rust-lang/rust/pull/72014/
2087 [72062]: https://github.com/rust-lang/rust/pull/72062/
2088 [72094]: https://github.com/rust-lang/rust/pull/72094/
2089 [72133]: https://github.com/rust-lang/rust/pull/72133/
2090 [67759]: https://github.com/rust-lang/rust/pull/67759/
2091 [71900]: https://github.com/rust-lang/rust/pull/71900/
2092 [71928]: https://github.com/rust-lang/rust/pull/71928/
2093 [71662]: https://github.com/rust-lang/rust/pull/71662/
2094 [71716]: https://github.com/rust-lang/rust/pull/71716/
2095 [71447]: https://github.com/rust-lang/rust/pull/71447/
2096 [71269]: https://github.com/rust-lang/rust/pull/71269/
2097 [71095]: https://github.com/rust-lang/rust/pull/71095/
2098 [71140]: https://github.com/rust-lang/rust/pull/71140/
2099 [70655]: https://github.com/rust-lang/rust/pull/70655/
2100 [70705]: https://github.com/rust-lang/rust/pull/70705/
2101 [69984]: https://github.com/rust-lang/rust/pull/69984/
2102 [69813]: https://github.com/rust-lang/rust/pull/69813/
2103 [69464]: https://github.com/rust-lang/rust/pull/69464/
2104 [68717]: https://github.com/rust-lang/rust/pull/68717/
2105 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2106 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2107 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2108 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2109 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2110 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2111 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2112 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2113 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2114 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2115 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2116 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2117 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2118 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2119 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2120 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2121 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2124 Version 1.44.1 (2020-06-18)
2125 ===========================
2127 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2128 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2129 * [Fix crashes when finding backtrace on macOS.][71397]
2130 * [Clippy applies lint levels into different files.][clippy/5356]
2132 [71397]: https://github.com/rust-lang/rust/issues/71397
2133 [73078]: https://github.com/rust-lang/rust/issues/73078
2134 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2135 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2138 Version 1.44.0 (2020-06-04)
2139 ==========================
2143 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2144 - [Added the `unused_braces` lint.][70081]
2146 **Syntax-only changes**
2148 - [Expansion-driven outline module parsing][69838]
2153 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2158 These are still rejected semantically, so you will likely receive an error but
2159 these changes can be seen and parsed by macros and conditional compilation.
2163 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2164 Additionally when in incremental mode rustc defaults to 256 codegen units.
2165 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2166 a panic is thrown.][67502]
2167 - [Added tier 3\* support for the `aarch64-unknown-none` and
2168 `aarch64-unknown-none-softfloat` targets.][68334]
2169 - [Added tier 3 support for `arm64-apple-tvos` and
2170 `x86_64-apple-tvos` targets.][68191]
2175 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2176 `vec![]` to be able to be used in `const` contexts.
2177 - [`convert::Infallible` now implements `Hash`.][70281]
2178 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2179 a `&mut OsStr`.][70048]
2180 - [Unicode 13 is now supported.][69929]
2181 - [`String` now implements `From<&mut str>`.][69661]
2182 - [`IoSlice` now implements `Copy`.][69403]
2183 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2184 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2185 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2186 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2187 integer types.][69373]
2191 - [`PathBuf::with_capacity`]
2192 - [`PathBuf::capacity`]
2193 - [`PathBuf::clear`]
2194 - [`PathBuf::reserve`]
2195 - [`PathBuf::reserve_exact`]
2196 - [`PathBuf::shrink_to_fit`]
2197 - [`f32::to_int_unchecked`]
2198 - [`f64::to_int_unchecked`]
2199 - [`Layout::align_to`]
2200 - [`Layout::pad_to_align`]
2202 - [`Layout::extend`]
2206 - [Added the `cargo tree` command which will print a tree graph of
2207 your dependencies.][cargo/8062] E.g.
2209 mdbook v0.3.2 (/Users/src/rust/mdbook)
2211 │ ├── html5ever v0.24.0
2213 │ │ │ └── cfg-if v0.1.9
2215 │ │ └── markup5ever v0.9.0
2216 │ │ ├── log v0.4.8 (*)
2218 │ │ │ └── phf_shared v0.7.24
2219 │ │ │ ├── siphasher v0.2.3
2220 │ │ │ └── unicase v1.4.2
2221 │ │ │ [build-dependencies]
2222 │ │ │ └── version_check v0.1.5
2225 You can also display dependencies on multiple versions of the same crate with
2226 `cargo tree -d` (short for `cargo tree --duplicates`).
2230 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2231 the version in the sidebar.][69494]
2235 - [Rustc now correctly generates static libraries on Windows GNU targets with
2236 the `.a` extension, rather than the previous `.lib`.][70937]
2237 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2238 - [The `file_name` property in JSON output of macro errors now points the actual
2239 source file rather than the previous format of `<NAME macros>`.][70969]
2240 **Note:** this may not point to a file that actually exists on the user's system.
2241 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2242 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2243 not allow zero initialization such as `NonZeroU8`.][66059] This was
2244 previously a warning.
2245 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2246 operator has been defined as a saturating operation.][71269] This was previously
2247 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2248 continue using the current behaviour, which may be desirable in rare performance
2249 sensitive situations.
2253 These changes provide no direct user facing benefits, but represent significant
2254 improvements to the internals and overall performance of rustc and
2257 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2258 - [Replace big JS dict with JSON parsing.][71250]
2260 [69373]: https://github.com/rust-lang/rust/pull/69373/
2261 [66059]: https://github.com/rust-lang/rust/pull/66059/
2262 [68191]: https://github.com/rust-lang/rust/pull/68191/
2263 [68899]: https://github.com/rust-lang/rust/pull/68899/
2264 [71147]: https://github.com/rust-lang/rust/pull/71147/
2265 [71250]: https://github.com/rust-lang/rust/pull/71250/
2266 [70937]: https://github.com/rust-lang/rust/pull/70937/
2267 [70969]: https://github.com/rust-lang/rust/pull/70969/
2268 [70632]: https://github.com/rust-lang/rust/pull/70632/
2269 [70281]: https://github.com/rust-lang/rust/pull/70281/
2270 [70345]: https://github.com/rust-lang/rust/pull/70345/
2271 [70048]: https://github.com/rust-lang/rust/pull/70048/
2272 [70081]: https://github.com/rust-lang/rust/pull/70081/
2273 [70156]: https://github.com/rust-lang/rust/pull/70156/
2274 [71269]: https://github.com/rust-lang/rust/pull/71269/
2275 [69838]: https://github.com/rust-lang/rust/pull/69838/
2276 [69929]: https://github.com/rust-lang/rust/pull/69929/
2277 [69661]: https://github.com/rust-lang/rust/pull/69661/
2278 [69778]: https://github.com/rust-lang/rust/pull/69778/
2279 [69494]: https://github.com/rust-lang/rust/pull/69494/
2280 [69403]: https://github.com/rust-lang/rust/pull/69403/
2281 [69033]: https://github.com/rust-lang/rust/pull/69033/
2282 [68692]: https://github.com/rust-lang/rust/pull/68692/
2283 [68334]: https://github.com/rust-lang/rust/pull/68334/
2284 [67502]: https://github.com/rust-lang/rust/pull/67502/
2285 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2286 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2287 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2288 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2289 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2290 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2291 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2292 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2293 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2294 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2295 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2296 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2297 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2300 Version 1.43.1 (2020-05-07)
2301 ===========================
2303 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2304 * [Fixed the stabilization of AVX-512 features.][71473]
2305 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2307 [71430]: https://github.com/rust-lang/rust/pull/71430
2308 [71473]: https://github.com/rust-lang/rust/issues/71473
2309 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2312 Version 1.43.0 (2020-04-23)
2313 ==========================
2317 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2318 the type inferred correctly.][68129]
2319 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2321 **Syntax only changes**
2322 - [Allow `type Foo: Ord` syntactically.][69361]
2323 - [Fuse associated and extern items up to defaultness.][69194]
2324 - [Syntactically allow `self` in all `fn` contexts.][68764]
2325 - [Merge `fn` syntax + cleanup item parsing.][68728]
2326 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2327 For example, you may now write:
2329 macro_rules! mac_trait {
2339 These are still rejected *semantically*, so you will likely receive an error but
2340 these changes can be seen and parsed by macros and
2341 conditional compilation.
2346 - [You can now pass multiple lint flags to rustc to override the previous
2347 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2348 everything in the `unused` lint group except `unused-variables` which
2349 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2350 everything in the `unused` lint group **including** `unused-variables` since
2351 the allow flag is specified before the deny flag (and therefore overridden).
2352 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2353 if they are available on `windows-gnu`.][67429]
2354 - [rustc now buffers errors/warnings printed in JSON.][69227]
2358 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2359 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2360 respectively.][69538] **Note** These conversions are only available when `N`
2362 - [You can now use associated constants on floats and integers directly, rather
2363 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2364 `f32::NAN` with no imports.
2365 - [`u8::is_ascii` is now `const`.][68984]
2366 - [`String` now implements `AsMut<str>`.][68742]
2367 - [Added the `primitive` module to `std` and `core`.][67637] This module
2368 reexports Rust's primitive types. This is mainly useful in macros
2369 where you want avoid these types being shadowed.
2370 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2371 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2375 - [`Once::is_completed`]
2380 - [`iter::once_with`]
2384 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2385 your environment.][cargo/7823]
2386 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2387 executable path when running integration tests or benchmarks.][cargo/7697]
2388 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2389 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2393 - [Certain checks in the `const_err` lint were deemed unrelated to const
2394 evaluation][69185], and have been moved to the `unconditional_panic` and
2395 `arithmetic_overflow` lints.
2400 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2401 has been a warning since 1.36.0.
2402 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2403 led to some instances being accepted, and now correctly emits a hard error.
2405 [69340]: https://github.com/rust-lang/rust/pull/69340
2409 These changes provide no direct user facing benefits, but represent significant
2410 improvements to the internals and overall performance of `rustc` and
2413 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2414 - [Improved how rustc generates drop code.][67332]
2415 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2416 - [traits: preallocate 2 Vecs of known initial size][69022]
2417 - [Avoid exponential behaviour when relating types][68772]
2418 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2419 - [Improve performance of coherence checks][68966]
2420 - [Deduplicate types in the generator witness][68672]
2421 - [Invert control in struct_lint_level.][68725]
2423 [67332]: https://github.com/rust-lang/rust/pull/67332/
2424 [67429]: https://github.com/rust-lang/rust/pull/67429/
2425 [67637]: https://github.com/rust-lang/rust/pull/67637/
2426 [67642]: https://github.com/rust-lang/rust/pull/67642/
2427 [67878]: https://github.com/rust-lang/rust/pull/67878/
2428 [67885]: https://github.com/rust-lang/rust/pull/67885/
2429 [68129]: https://github.com/rust-lang/rust/pull/68129/
2430 [68672]: https://github.com/rust-lang/rust/pull/68672/
2431 [68725]: https://github.com/rust-lang/rust/pull/68725/
2432 [68728]: https://github.com/rust-lang/rust/pull/68728/
2433 [68738]: https://github.com/rust-lang/rust/pull/68738/
2434 [68742]: https://github.com/rust-lang/rust/pull/68742/
2435 [68764]: https://github.com/rust-lang/rust/pull/68764/
2436 [68772]: https://github.com/rust-lang/rust/pull/68772/
2437 [68943]: https://github.com/rust-lang/rust/pull/68943/
2438 [68952]: https://github.com/rust-lang/rust/pull/68952/
2439 [68966]: https://github.com/rust-lang/rust/pull/68966/
2440 [68984]: https://github.com/rust-lang/rust/pull/68984/
2441 [69022]: https://github.com/rust-lang/rust/pull/69022/
2442 [69185]: https://github.com/rust-lang/rust/pull/69185/
2443 [69194]: https://github.com/rust-lang/rust/pull/69194/
2444 [69201]: https://github.com/rust-lang/rust/pull/69201/
2445 [69227]: https://github.com/rust-lang/rust/pull/69227/
2446 [69548]: https://github.com/rust-lang/rust/pull/69548/
2447 [69256]: https://github.com/rust-lang/rust/pull/69256/
2448 [69361]: https://github.com/rust-lang/rust/pull/69361/
2449 [69366]: https://github.com/rust-lang/rust/pull/69366/
2450 [69538]: https://github.com/rust-lang/rust/pull/69538/
2451 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2452 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2453 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2454 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2455 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2456 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2457 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2458 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2461 Version 1.42.0 (2020-03-12)
2462 ==========================
2466 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2468 fn foo(words: &[&str]) {
2470 ["Hello", "World", "!", ..] => println!("Hello World!"),
2471 ["Foo", "Bar", ..] => println!("Baz"),
2472 rest => println!("{:?}", rest),
2476 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2477 that you can create an enum that has the exact layout and ABI of the type
2479 - [You can now use outer attribute procedural macros on inline modules.][64273]
2480 - [There are some *syntax-only* changes:][67131]
2481 - `default` is syntactically allowed before items in `trait` definitions.
2482 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2483 leave out their bodies in favor of `;`.
2484 - Bounds on associated types in `impl`s are now syntactically allowed
2485 (e.g. `type Foo: Ord;`).
2486 - `...` (the C-variadic type) may occur syntactically directly as the type of
2487 any function parameter.
2489 These are still rejected *semantically*, so you will likely receive an error
2490 but these changes can be seen and parsed by procedural macros and
2491 conditional compilation.
2495 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2496 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2497 - [`Option::{expect,unwrap}` and
2498 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2499 pointing to the location where they were called, rather than
2500 `core`'s internals. ][67887]
2502 \* Refer to Rust's [platform support page][platform-support-doc] for more
2503 information on Rust's tiered platform support.
2507 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2508 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2509 to implement `Sized`.][67935]
2510 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2511 - [`Layout::new` is now `const`.][66254]
2512 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2517 - [`CondVar::wait_while`]
2518 - [`CondVar::wait_timeout_while`]
2520 - [`DebugMap::value`]
2521 - [`ManuallyDrop::take`]
2523 - [`ptr::slice_from_raw_parts_mut`]
2524 - [`ptr::slice_from_raw_parts`]
2528 - [You no longer need to include `extern crate proc_macro;` to be able to
2529 `use proc_macro;` in the `2018` edition.][cargo/7700]
2533 - [`Error::description` has been deprecated, and its use will now produce a
2534 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2536 [68253]: https://github.com/rust-lang/rust/pull/68253/
2537 [68348]: https://github.com/rust-lang/rust/pull/68348/
2538 [67935]: https://github.com/rust-lang/rust/pull/67935/
2539 [68339]: https://github.com/rust-lang/rust/pull/68339/
2540 [68122]: https://github.com/rust-lang/rust/pull/68122/
2541 [64273]: https://github.com/rust-lang/rust/pull/64273/
2542 [67712]: https://github.com/rust-lang/rust/pull/67712/
2543 [67887]: https://github.com/rust-lang/rust/pull/67887/
2544 [67131]: https://github.com/rust-lang/rust/pull/67131/
2545 [67233]: https://github.com/rust-lang/rust/pull/67233/
2546 [66899]: https://github.com/rust-lang/rust/pull/66899/
2547 [66919]: https://github.com/rust-lang/rust/pull/66919/
2548 [66254]: https://github.com/rust-lang/rust/pull/66254/
2549 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2550 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2551 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2552 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2553 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2554 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2555 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2556 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2557 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2560 Version 1.41.1 (2020-02-27)
2561 ===========================
2563 * [Always check types of static items][69145]
2564 * [Always check lifetime bounds of `Copy` impls][69145]
2565 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2567 [69225]: https://github.com/rust-lang/rust/issues/69225
2568 [69145]: https://github.com/rust-lang/rust/pull/69145
2571 Version 1.41.0 (2020-01-30)
2572 ===========================
2577 - [You can now pass type parameters to foreign items when implementing
2578 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2579 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2580 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2581 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2582 - [You can now use any valid identifier in a `format_args` macro.][66847]
2583 Previously identifiers starting with an underscore were not allowed.
2584 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2585 enum variants.][66183] These are still rejected semantically, but
2586 can be seen and parsed by procedural macros and conditional compilation.
2591 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2592 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2593 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2594 - [You can now pass an arguments file passing the `@path` syntax
2595 to rustc.][66172] Note that the format differs somewhat from what is
2596 found in other tooling; please see [the documentation][argfile-docs] for
2598 - [You can now provide `--extern` flag without a path, indicating that it is
2599 available from the search path or specified with an `-L` flag.][64882]
2601 \* Refer to Rust's [platform support page][platform-support-doc] for more
2602 information on Rust's tiered platform support.
2604 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2609 - [The `core::panic` module is now stable.][66771] It was already stable
2611 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2612 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2613 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2618 - [`Result::map_or`]
2619 - [`Result::map_or_else`]
2620 - [`std::rc::Weak::weak_count`]
2621 - [`std::rc::Weak::strong_count`]
2622 - [`std::sync::Weak::weak_count`]
2623 - [`std::sync::Weak::strong_count`]
2628 - [Cargo will now document all the private items for binary crates
2629 by default.][cargo/7593]
2630 - [`cargo-install` will now reinstall the package if it detects that it is out
2631 of date.][cargo/7560]
2632 - [Cargo.lock now uses a more git friendly format that should help to reduce
2633 merge conflicts.][cargo/7579]
2634 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2635 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2636 optimisation level to `2` for debug builds. You can also use
2637 `[profile.<profile>.build-override]` to override build scripts and
2643 - [You can now specify `edition` in documentation code blocks to compile the block
2644 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2645 should be compiled the 2018 edition of Rust.
2646 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2647 current theme with `--check-theme`.][54733]
2648 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2653 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2654 Apple targets.][apple-32bit-drop] This means that the source code is still
2655 available to build, but the targets are no longer being tested and release
2656 binaries for those platforms will no longer be distributed by the Rust project.
2657 Please refer to the linked blog post for more information.
2659 [54733]: https://github.com/rust-lang/rust/pull/54733/
2660 [61351]: https://github.com/rust-lang/rust/pull/61351/
2661 [67255]: https://github.com/rust-lang/rust/pull/67255/
2662 [66661]: https://github.com/rust-lang/rust/pull/66661/
2663 [66771]: https://github.com/rust-lang/rust/pull/66771/
2664 [66847]: https://github.com/rust-lang/rust/pull/66847/
2665 [66238]: https://github.com/rust-lang/rust/pull/66238/
2666 [66277]: https://github.com/rust-lang/rust/pull/66277/
2667 [66325]: https://github.com/rust-lang/rust/pull/66325/
2668 [66172]: https://github.com/rust-lang/rust/pull/66172/
2669 [66183]: https://github.com/rust-lang/rust/pull/66183/
2670 [65879]: https://github.com/rust-lang/rust/pull/65879/
2671 [65013]: https://github.com/rust-lang/rust/pull/65013/
2672 [64882]: https://github.com/rust-lang/rust/pull/64882/
2673 [64325]: https://github.com/rust-lang/rust/pull/64325/
2674 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2675 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2676 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2677 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2678 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2679 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2680 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2681 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2682 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2683 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2684 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2686 Version 1.40.0 (2019-12-19)
2687 ===========================
2691 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2692 `const` contexts.][65188] e.g.
2695 pub struct Point(i32, i32);
2697 const ORIGIN: Point = {
2698 let constructor = Point;
2704 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2705 indicate that there may be variants or fields added in the future.][64639]
2706 For example this requires adding a wild-card branch (`_ => {}`) to any match
2707 statements on a non-exhaustive `enum`. [(RFC 2008)]
2708 - [You can now use function-like procedural macros in `extern` blocks and in
2709 type positions.][63931] e.g. `type Generated = macro!();`
2710 - [Function-like and attribute procedural macros can now emit
2711 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2712 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2713 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2714 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2718 - [Added tier 3 support\* for the
2719 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2720 - [Added tier 3 support for the
2721 `aarch64-unknown-none-softfloat` target.][64589]
2722 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2723 `mips64el-unknown-linux-muslabi64` targets.][65843]
2725 \* Refer to Rust's [platform support page][platform-support-doc] for more
2726 information on Rust's tiered platform support.
2730 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2734 - [`BTreeMap::get_key_value`]
2735 - [`HashMap::get_key_value`]
2736 - [`Option::as_deref_mut`]
2737 - [`Option::as_deref`]
2738 - [`Option::flatten`]
2739 - [`UdpSocket::peer_addr`]
2740 - [`f32::to_be_bytes`]
2741 - [`f32::to_le_bytes`]
2742 - [`f32::to_ne_bytes`]
2743 - [`f64::to_be_bytes`]
2744 - [`f64::to_le_bytes`]
2745 - [`f64::to_ne_bytes`]
2746 - [`f32::from_be_bytes`]
2747 - [`f32::from_le_bytes`]
2748 - [`f32::from_ne_bytes`]
2749 - [`f64::from_be_bytes`]
2750 - [`f64::from_le_bytes`]
2751 - [`f64::from_ne_bytes`]
2758 - [Cargo will now always display warnings, rather than only on
2759 fresh builds.][cargo/7450]
2760 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2761 now produce an error.][cargo/7507] Previously these flags were ignored.
2762 - [You can now publish `dev-dependencies` without including
2763 a `version`.][cargo/7333]
2767 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2768 when running documentation tests with `rustdoc`.][63803]
2772 - [As previously announced, any previous NLL warnings in the 2015 edition are
2773 now hard errors.][64221]
2774 - [The `include!` macro will now warn if it failed to include the
2775 entire file.][64284] The `include!` macro unintentionally only includes the
2776 first _expression_ in a file, and this can be unintuitive. This will become
2777 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2778 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2779 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2780 or `extern` blocks now correctly emits a hard error.
2782 [65294]: https://github.com/rust-lang/rust/pull/65294/
2783 [66103]: https://github.com/rust-lang/rust/pull/66103/
2784 [65843]: https://github.com/rust-lang/rust/pull/65843/
2785 [65188]: https://github.com/rust-lang/rust/pull/65188/
2786 [65092]: https://github.com/rust-lang/rust/pull/65092/
2787 [64589]: https://github.com/rust-lang/rust/pull/64589/
2788 [64639]: https://github.com/rust-lang/rust/pull/64639/
2789 [64221]: https://github.com/rust-lang/rust/pull/64221/
2790 [64284]: https://github.com/rust-lang/rust/pull/64284/
2791 [63931]: https://github.com/rust-lang/rust/pull/63931/
2792 [64035]: https://github.com/rust-lang/rust/pull/64035/
2793 [63674]: https://github.com/rust-lang/rust/pull/63674/
2794 [63803]: https://github.com/rust-lang/rust/pull/63803/
2795 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2796 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2797 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2798 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2799 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2800 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2801 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2802 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2803 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2804 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2805 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2806 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2807 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2808 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2809 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2810 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2811 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2812 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2813 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2814 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2815 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2816 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2817 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2818 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2819 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2820 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2823 Version 1.39.0 (2019-11-07)
2824 ===========================
2828 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2829 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2830 - [You can now use certain attributes on function, closure, and function pointer
2831 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2832 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2833 attributes applied to items. e.g.
2836 #[cfg(windows)] slice: &[u16],
2837 #[cfg(not(windows))] slice: &[u8],
2842 - [You can now take shared references to bind-by-move patterns in the `if` guards
2843 of `match` arms.][63118] e.g.
2846 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2850 // ---- `nums` is bound by move.
2851 if nums.iter().sum::<u8>() == 10
2852 // ^------ `.iter()` implicitly takes a reference to `nums`.
2855 // ----------- Legal as `nums` was bound by move and so we have ownership.
2857 _ => unreachable!(),
2866 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2867 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2868 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2869 **Note** Cargo currently doesn't use this feature. Refer to
2870 [cargo#7315][cargo/7315] to track this feature's progress.
2871 - [You can now pass `--show-output` argument to test binaries to print the
2872 output of successful tests.][62600]
2875 \* Refer to Rust's [platform support page][platform-support-doc] for more
2876 information on Rust's tiered platform support.
2880 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2881 - [`LinkedList::new` is now a `const` function.][63684]
2882 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2883 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2884 now `const`.][63786]
2888 - [`Pin::into_inner`]
2889 - [`Instant::checked_duration_since`]
2890 - [`Instant::saturating_duration_since`]
2894 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2895 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2896 `--all` is now deprecated.
2900 - [You can now pass `-Clinker` to rustdoc to control the linker used
2901 for compiling doctests.][63834]
2905 - [Code that was previously accepted by the old borrow checker, but rejected by
2906 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2907 previously a warning, and will also become a hard error in the Rust 2015
2908 edition in the 1.40.0 release.
2909 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2910 run tests.][63827] This should improve performance when running a large
2912 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2913 recommended to use the `?` operator instead.
2914 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2917 [62600]: https://github.com/rust-lang/rust/pull/62600/
2918 [62672]: https://github.com/rust-lang/rust/pull/62672/
2919 [63118]: https://github.com/rust-lang/rust/pull/63118/
2920 [63209]: https://github.com/rust-lang/rust/pull/63209/
2921 [63402]: https://github.com/rust-lang/rust/pull/63402/
2922 [63565]: https://github.com/rust-lang/rust/pull/63565/
2923 [63595]: https://github.com/rust-lang/rust/pull/63595/
2924 [63684]: https://github.com/rust-lang/rust/pull/63684/
2925 [63698]: https://github.com/rust-lang/rust/pull/63698/
2926 [63770]: https://github.com/rust-lang/rust/pull/63770/
2927 [63786]: https://github.com/rust-lang/rust/pull/63786/
2928 [63827]: https://github.com/rust-lang/rust/pull/63827/
2929 [63834]: https://github.com/rust-lang/rust/pull/63834/
2930 [63927]: https://github.com/rust-lang/rust/pull/63927/
2931 [63933]: https://github.com/rust-lang/rust/pull/63933/
2932 [63934]: https://github.com/rust-lang/rust/pull/63934/
2933 [63938]: https://github.com/rust-lang/rust/pull/63938/
2934 [63940]: https://github.com/rust-lang/rust/pull/63940/
2935 [63941]: https://github.com/rust-lang/rust/pull/63941/
2936 [63945]: https://github.com/rust-lang/rust/pull/63945/
2937 [64010]: https://github.com/rust-lang/rust/pull/64010/
2938 [64028]: https://github.com/rust-lang/rust/pull/64028/
2939 [64334]: https://github.com/rust-lang/rust/pull/64334/
2940 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2941 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2942 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2943 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2944 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2945 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2947 Version 1.38.0 (2019-09-26)
2948 ==========================
2952 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2953 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2957 - [Added pipelined compilation support to `rustc`.][62766] This will
2958 improve compilation times in some cases. For further information please refer
2959 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2960 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2961 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2962 `x86_64-uwp-windows-msvc` targets.][60260]
2963 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2964 `armv7-unknown-linux-musleabi` targets.][63107]
2965 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2966 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2967 - [Upgraded to LLVM 9.][62592]
2969 \* Refer to Rust's [platform support page][platform-support-doc] for more
2970 information on Rust's tiered platform support.
2974 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2975 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2976 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2977 is available at `std::clone::Clone`). This also makes all built-in macros
2978 available in `std`/`core` root. e.g. `std::include_bytes!`.
2979 - [`str::Chars` now implements `Debug`.][63000]
2980 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2981 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2982 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2983 - [Added euclidean remainder and division operations (`div_euclid`,
2984 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2985 `overflowing`, and `wrapping` versions are available for all
2987 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2988 `PartialEq`.][61491]
2989 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2993 - [`<*const T>::cast`]
2994 - [`<*mut T>::cast`]
2995 - [`Duration::as_secs_f32`]
2996 - [`Duration::as_secs_f64`]
2997 - [`Duration::div_f32`]
2998 - [`Duration::div_f64`]
2999 - [`Duration::from_secs_f32`]
3000 - [`Duration::from_secs_f64`]
3001 - [`Duration::mul_f32`]
3002 - [`Duration::mul_f64`]
3003 - [`any::type_name`]
3007 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3008 - [You can now pass the `--features` option multiple times to enable
3009 multiple features.][cargo/7084]
3014 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3018 - [`rustc` will now warn about some incorrect uses of
3019 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3023 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3025 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3026 issues][62896] with certain crates such as libc.
3028 [60260]: https://github.com/rust-lang/rust/pull/60260/
3029 [61457]: https://github.com/rust-lang/rust/pull/61457/
3030 [61491]: https://github.com/rust-lang/rust/pull/61491/
3031 [61884]: https://github.com/rust-lang/rust/pull/61884/
3032 [61953]: https://github.com/rust-lang/rust/pull/61953/
3033 [62042]: https://github.com/rust-lang/rust/pull/62042/
3034 [62528]: https://github.com/rust-lang/rust/pull/62528/
3035 [62583]: https://github.com/rust-lang/rust/pull/62583/
3036 [62735]: https://github.com/rust-lang/rust/pull/62735/
3037 [62766]: https://github.com/rust-lang/rust/pull/62766/
3038 [62784]: https://github.com/rust-lang/rust/pull/62784/
3039 [62592]: https://github.com/rust-lang/rust/pull/62592/
3040 [62785]: https://github.com/rust-lang/rust/issues/62785/
3041 [62814]: https://github.com/rust-lang/rust/pull/62814/
3042 [62896]: https://github.com/rust-lang/rust/issues/62896/
3043 [63000]: https://github.com/rust-lang/rust/pull/63000/
3044 [63056]: https://github.com/rust-lang/rust/pull/63056/
3045 [63107]: https://github.com/rust-lang/rust/pull/63107/
3046 [63346]: https://github.com/rust-lang/rust/pull/63346/
3047 [63421]: https://github.com/rust-lang/rust/pull/63421/
3048 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3049 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3050 [63048]: https://github.com/rust-lang/rust/pull/63048
3051 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3052 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3053 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3054 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3055 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3056 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3057 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3058 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3059 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3060 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3061 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3062 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3063 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3065 Version 1.37.0 (2019-08-15)
3066 ==========================
3070 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3071 [`Box`][62228], or an [array][62235] and unused.
3072 - [You can now use the `cfg` and `cfg_attr` attributes on
3073 generic parameters.][61547]
3074 - [You can now use enum variants through type alias.][61682] e.g. You can
3075 write the following:
3077 type MyOption = Option<u8>;
3079 fn increment_or_zero(x: MyOption) -> u8 {
3081 MyOption::Some(y) => y + 1,
3082 MyOption::None => 0,
3086 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3087 `const _: u32 = 5;`.
3088 - [You can now use `#[repr(align(X)]` on enums.][61229]
3089 - [The `?` Kleene macro operator is now available in the
3090 2015 edition.][60932]
3094 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3095 and `-C profile-use` flags.][61268] For more information on how to use profile
3096 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3097 - [The `rust-lldb` wrapper script should now work again.][61827]
3101 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3105 - [`BufReader::buffer`]
3106 - [`BufWriter::buffer`]
3107 - [`Cell::from_mut`]
3108 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3109 - [`DoubleEndedIterator::nth_back`]
3111 - [`Wrapping::reverse_bits`]
3112 - [`i128::reverse_bits`]
3113 - [`i16::reverse_bits`]
3114 - [`i32::reverse_bits`]
3115 - [`i64::reverse_bits`]
3116 - [`i8::reverse_bits`]
3117 - [`isize::reverse_bits`]
3118 - [`slice::copy_within`]
3119 - [`u128::reverse_bits`]
3120 - [`u16::reverse_bits`]
3121 - [`u32::reverse_bits`]
3122 - [`u64::reverse_bits`]
3123 - [`u8::reverse_bits`]
3124 - [`usize::reverse_bits`]
3128 - [`Cargo.lock` files are now included by default when publishing executable crates
3129 with executables.][cargo/7026]
3130 - [You can now specify `default-run="foo"` in `[package]` to specify the
3131 default executable to use for `cargo run`.][cargo/7056]
3138 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3139 Please transition your code to using the `..=` syntax for inclusive
3141 - [Using a trait object without the `dyn` will now warn by default.][61203]
3142 Please transition your code to use `dyn Trait` for trait objects instead.
3144 [62228]: https://github.com/rust-lang/rust/pull/62228/
3145 [62235]: https://github.com/rust-lang/rust/pull/62235/
3146 [61802]: https://github.com/rust-lang/rust/pull/61802/
3147 [61827]: https://github.com/rust-lang/rust/pull/61827/
3148 [61547]: https://github.com/rust-lang/rust/pull/61547/
3149 [61682]: https://github.com/rust-lang/rust/pull/61682/
3150 [61268]: https://github.com/rust-lang/rust/pull/61268/
3151 [61342]: https://github.com/rust-lang/rust/pull/61342/
3152 [61347]: https://github.com/rust-lang/rust/pull/61347/
3153 [61100]: https://github.com/rust-lang/rust/pull/61100/
3154 [61203]: https://github.com/rust-lang/rust/pull/61203/
3155 [61229]: https://github.com/rust-lang/rust/pull/61229/
3156 [60932]: https://github.com/rust-lang/rust/pull/60932/
3157 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3158 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3159 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3160 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3161 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3162 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3163 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3164 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3165 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
3166 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3167 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3168 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3169 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3170 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3171 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3172 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3173 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3174 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3175 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3176 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3177 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3178 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3179 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3180 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3183 Version 1.36.0 (2019-07-04)
3184 ==========================
3188 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3189 - [The order of traits in trait objects no longer affects the semantics of that
3190 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3191 `dyn fmt::Debug + Send`, where this was previously not the case.
3195 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3196 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3197 - [`mem::needs_drop` is now available as a const fn.][60364]
3198 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3199 - [`String` now implements `BorrowMut<str>`.][60404]
3200 - [`io::Cursor` now implements `Default`.][60234]
3201 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3202 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3203 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3204 environment has access to heap memory allocation.
3205 - [`String` now implements `From<&String>`.][59825]
3206 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3207 return a tuple of each argument when there is multiple arguments.
3208 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3213 - [`VecDeque::rotate_left`]
3214 - [`VecDeque::rotate_right`]
3215 - [`Iterator::copied`]
3217 - [`io::IoSliceMut`]
3218 - [`Read::read_vectored`]
3219 - [`Write::write_vectored`]
3220 - [`str::as_mut_ptr`]
3221 - [`mem::MaybeUninit`]
3222 - [`pointer::align_offset`]
3223 - [`future::Future`]
3225 - [`task::RawWaker`]
3226 - [`task::RawWakerVTable`]
3232 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3233 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3235 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3239 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3246 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3247 longer recommended, and will be deprecated in 1.39.0.
3249 [60318]: https://github.com/rust-lang/rust/pull/60318/
3250 [60364]: https://github.com/rust-lang/rust/pull/60364/
3251 [60370]: https://github.com/rust-lang/rust/pull/60370/
3252 [60404]: https://github.com/rust-lang/rust/pull/60404/
3253 [60234]: https://github.com/rust-lang/rust/pull/60234/
3254 [60244]: https://github.com/rust-lang/rust/pull/60244/
3255 [58623]: https://github.com/rust-lang/rust/pull/58623/
3256 [59648]: https://github.com/rust-lang/rust/pull/59648/
3257 [59675]: https://github.com/rust-lang/rust/pull/59675/
3258 [59825]: https://github.com/rust-lang/rust/pull/59825/
3259 [59826]: https://github.com/rust-lang/rust/pull/59826/
3260 [59445]: https://github.com/rust-lang/rust/pull/59445/
3261 [59114]: https://github.com/rust-lang/rust/pull/59114/
3262 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3263 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3264 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3265 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3266 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3267 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3268 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3269 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3270 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3271 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3272 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3273 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3274 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3275 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3276 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3277 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3278 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3279 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3280 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3281 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3284 Version 1.35.0 (2019-05-23)
3285 ==========================
3289 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3290 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3291 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3293 unsafe fn call_unsafe(func: unsafe fn()) {
3298 unsafe { call_unsafe(|| {}); }
3305 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3306 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3307 - [Added the `wasm32-unknown-wasi` target.][59464]
3312 - [`Thread` will now show its ID in `Debug` output.][59460]
3313 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3314 - [`alloc::System` now implements `Default`.][59451]
3315 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3317 - [`char::{ToLowercase, ToUppercase}` now
3318 implement `ExactSizeIterator`.][58778]
3319 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3320 - [Removed the `Read` trait bounds
3321 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3322 - [You can now call the `dbg!` macro without any parameters to print the file
3323 and line where it is called.][57847]
3324 - [In place ASCII case conversions are now up to 4× faster.][59283]
3325 e.g. `str::make_ascii_lowercase`
3326 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3333 - [`RefCell::replace_with`]
3334 - [`RefCell::map_split`]
3336 - [`Range::contains`]
3337 - [`RangeFrom::contains`]
3338 - [`RangeTo::contains`]
3339 - [`RangeInclusive::contains`]
3340 - [`RangeToInclusive::contains`]
3341 - [`Option::copied`]
3345 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3346 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3351 - [The Rust toolchain is now available natively for musl based distros.][58575]
3353 [59460]: https://github.com/rust-lang/rust/pull/59460/
3354 [59464]: https://github.com/rust-lang/rust/pull/59464/
3355 [59500]: https://github.com/rust-lang/rust/pull/59500/
3356 [59512]: https://github.com/rust-lang/rust/pull/59512/
3357 [59580]: https://github.com/rust-lang/rust/pull/59580/
3358 [59283]: https://github.com/rust-lang/rust/pull/59283/
3359 [59451]: https://github.com/rust-lang/rust/pull/59451/
3360 [59076]: https://github.com/rust-lang/rust/pull/59076/
3361 [58778]: https://github.com/rust-lang/rust/pull/58778/
3362 [58717]: https://github.com/rust-lang/rust/pull/58717/
3363 [58369]: https://github.com/rust-lang/rust/pull/58369/
3364 [58423]: https://github.com/rust-lang/rust/pull/58423/
3365 [58080]: https://github.com/rust-lang/rust/pull/58080/
3366 [57847]: https://github.com/rust-lang/rust/pull/57847/
3367 [58575]: https://github.com/rust-lang/rust/pull/58575
3368 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3369 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3370 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3371 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3372 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3373 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3374 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3375 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3376 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3377 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3378 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3379 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3381 Version 1.34.2 (2019-05-14)
3382 ===========================
3384 * [Destabilize the `Error::type_id` function due to a security
3385 vulnerability][60785] ([CVE-2019-12083])
3387 [60785]: https://github.com/rust-lang/rust/pull/60785
3388 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3390 Version 1.34.1 (2019-04-25)
3391 ===========================
3393 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3394 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3395 * [Fix Clippy panic when checking some macros][clippy/3805]
3397 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3398 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3399 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3401 Version 1.34.0 (2019-04-11)
3402 ==========================
3406 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3407 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3409 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3410 `#[attr{}]` procedural macros.][57367]
3411 - [You can now write `extern crate self as foo;`][57407] to import your
3412 crate's root into the extern prelude.
3417 - [You can now target `riscv64imac-unknown-none-elf` and
3418 `riscv64gc-unknown-none-elf`.][58406]
3419 - [You can now enable linker plugin LTO optimisations with
3420 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3421 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3423 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3428 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3429 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3430 the `Hash` trait to create an iterator.
3431 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3432 methods.][58421] Most notably you no longer require the `Ord` trait to create
3434 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3435 for all numeric types.][58044]
3436 - [Indexing a `str` is now generic over all types that
3437 implement `SliceIndex<str>`.][57604]
3438 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3439 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3440 produce a warning if their returning type is unused.
3441 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3442 `overflowing_pow` are now available for all numeric types.][57873] These are
3443 equivalent to methods such as `wrapping_add` for the `pow` operation.
3451 * [`Error::type_id`]
3452 * [`atomic::AtomicI16`]
3453 * [`atomic::AtomicI32`]
3454 * [`atomic::AtomicI64`]
3455 * [`atomic::AtomicI8`]
3456 * [`atomic::AtomicU16`]
3457 * [`atomic::AtomicU32`]
3458 * [`atomic::AtomicU64`]
3459 * [`atomic::AtomicU8`]
3460 * [`convert::Infallible`]
3461 * [`convert::TryFrom`]
3462 * [`convert::TryInto`]
3464 * [`iter::successors`]
3465 * [`num::NonZeroI128`]
3466 * [`num::NonZeroI16`]
3467 * [`num::NonZeroI32`]
3468 * [`num::NonZeroI64`]
3469 * [`num::NonZeroI8`]
3470 * [`num::NonZeroIsize`]
3471 * [`slice::sort_by_cached_key`]
3472 * [`str::escape_debug`]
3473 * [`str::escape_default`]
3474 * [`str::escape_unicode`]
3475 * [`str::split_ascii_whitespace`]
3478 * [`Instant::checked_add`]
3479 * [`Instant::checked_sub`]
3480 * [`SystemTime::checked_add`]
3481 * [`SystemTime::checked_sub`]
3485 - [You can now use alternative registries to crates.io.][cargo/6654]
3489 - [You can now use the `?` operator in your documentation tests without manually
3490 adding `fn main() -> Result<(), _> {}`.][56470]
3494 - [`Command::before_exec` is being replaced by the unsafe method
3495 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3496 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3497 can now use `const` functions in `static` variables.
3499 [58370]: https://github.com/rust-lang/rust/pull/58370/
3500 [58406]: https://github.com/rust-lang/rust/pull/58406/
3501 [58421]: https://github.com/rust-lang/rust/pull/58421/
3502 [58166]: https://github.com/rust-lang/rust/pull/58166/
3503 [58044]: https://github.com/rust-lang/rust/pull/58044/
3504 [58057]: https://github.com/rust-lang/rust/pull/58057/
3505 [58059]: https://github.com/rust-lang/rust/pull/58059/
3506 [57809]: https://github.com/rust-lang/rust/pull/57809/
3507 [57873]: https://github.com/rust-lang/rust/pull/57873/
3508 [57604]: https://github.com/rust-lang/rust/pull/57604/
3509 [57367]: https://github.com/rust-lang/rust/pull/57367/
3510 [57407]: https://github.com/rust-lang/rust/pull/57407/
3511 [57425]: https://github.com/rust-lang/rust/pull/57425/
3512 [57106]: https://github.com/rust-lang/rust/pull/57106/
3513 [56470]: https://github.com/rust-lang/rust/pull/56470/
3514 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3515 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3516 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3517 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3518 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3519 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3520 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3521 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3522 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3523 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3524 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3525 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3526 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3527 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3528 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3529 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3530 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3531 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3532 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3533 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3534 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3535 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3536 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3537 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3538 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3539 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3540 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3541 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3542 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3543 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3544 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3547 Version 1.33.0 (2019-02-28)
3548 ==========================
3552 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3553 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3554 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3555 E.g. You can have match statement on a `u8` that covers `0..=255` and
3556 you would no longer be required to have a `_ => unreachable!()` case.
3557 - [You can now have multiple patterns in `if let` and `while let`
3558 expressions.][57532] You can do this with the same syntax as a `match`
3568 let state = Creature::Crab("Ferris");
3570 if let Creature::Crab(name) | Creature::Person(name) = state {
3571 println!("This creature's name is: {}", name);
3575 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3576 this feature will by default produce a warning as this behaviour can be
3577 unintuitive. E.g. `if let _ = 5 {}`
3578 - [You can now use `let` bindings, assignments, expression statements,
3579 and irrefutable pattern destructuring in const functions.][57175]
3580 - [You can now call unsafe const functions.][57067] E.g.
3582 const unsafe fn foo() -> i32 { 5 }
3583 const fn bar() -> i32 {
3587 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3588 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3589 - [You can now specify a specific alignment with the `#[repr(packed)]`
3590 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3591 with an alignment of 2 bytes and a size of 6 bytes.
3592 - [You can now import an item from a module as an `_`.][56303] This allows you to
3593 import a trait's impls, and not have the name in the namespace. E.g.
3595 use std::io::Read as _;
3597 // Allowed as there is only one `Read` in the module.
3600 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3604 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3605 command line argument.][56351]
3606 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3607 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3608 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3609 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3610 information on Rust's platform support.
3611 - [Added support for the `thumbv7neon-linux-androideabi` and
3612 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3613 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3617 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3618 functions for all numeric types.][57566]
3619 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3620 are now `const` functions for all numeric types.][57105]
3621 - [The methods `is_positive` and `is_negative` are now `const` functions for
3622 all signed numeric types.][57105]
3623 - [The `get` method for all `NonZero` types is now `const`.][57167]
3624 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3625 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3626 numeric types.][57234]
3627 - [`Ipv4Addr::new` is now a `const` function][57234]
3631 - [`unix::FileExt::read_exact_at`]
3632 - [`unix::FileExt::write_all_at`]
3633 - [`Option::transpose`]
3634 - [`Result::transpose`]
3635 - [`convert::identity`]
3638 - [`marker::PhantomPinned`]
3639 - [`Vec::resize_with`]
3640 - [`VecDeque::resize_with`]
3641 - [`Duration::as_millis`]
3642 - [`Duration::as_micros`]
3643 - [`Duration::as_nanos`]
3648 - [You can now publish crates that require a feature flag to compile with
3649 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3650 - [Cargo should now rebuild a crate if a file was modified during the initial
3655 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3656 are now deprecated in the standard library, and their usage will now produce a warning.
3657 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3659 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3661 - [Libtest no longer creates a new thread for each test when
3662 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3664 [55982]: https://github.com/rust-lang/rust/pull/55982/
3665 [56243]: https://github.com/rust-lang/rust/pull/56243
3666 [56303]: https://github.com/rust-lang/rust/pull/56303/
3667 [56351]: https://github.com/rust-lang/rust/pull/56351/
3668 [56362]: https://github.com/rust-lang/rust/pull/56362
3669 [56642]: https://github.com/rust-lang/rust/pull/56642/
3670 [56769]: https://github.com/rust-lang/rust/pull/56769/
3671 [56805]: https://github.com/rust-lang/rust/pull/56805
3672 [56947]: https://github.com/rust-lang/rust/pull/56947/
3673 [57049]: https://github.com/rust-lang/rust/pull/57049/
3674 [57067]: https://github.com/rust-lang/rust/pull/57067/
3675 [57105]: https://github.com/rust-lang/rust/pull/57105
3676 [57130]: https://github.com/rust-lang/rust/pull/57130/
3677 [57167]: https://github.com/rust-lang/rust/pull/57167/
3678 [57175]: https://github.com/rust-lang/rust/pull/57175/
3679 [57234]: https://github.com/rust-lang/rust/pull/57234/
3680 [57332]: https://github.com/rust-lang/rust/pull/57332/
3681 [57465]: https://github.com/rust-lang/rust/pull/57465/
3682 [57532]: https://github.com/rust-lang/rust/pull/57532/
3683 [57535]: https://github.com/rust-lang/rust/pull/57535/
3684 [57566]: https://github.com/rust-lang/rust/pull/57566/
3685 [57615]: https://github.com/rust-lang/rust/pull/57615/
3686 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3687 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3688 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3689 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3690 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3691 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3692 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3693 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3694 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3695 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3696 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3697 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3698 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3699 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3700 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3701 [platform-support]: https://forge.rust-lang.org/platform-support.html
3703 Version 1.32.0 (2019-01-17)
3704 ==========================
3709 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3710 operator allows you to specify zero or one repetitions similar to the `*` and
3712 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3713 now always resolve to the item (`enum`, `struct`, etc.) available in the
3714 module if present, before resolving to a external crate or an item the prelude.][56759]
3717 enum Color { Red, Green, Blue }
3723 - [You can now match against `PhantomData<T>` types.][55837]
3724 - [You can now match against literals in macros with the `literal`
3725 specifier.][56072] This will match against a literal of any type.
3726 E.g. `1`, `'A'`, `"Hello World"`
3727 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3729 struct Point(i32, i32);
3732 pub fn new(x: i32, y: i32) -> Self {
3736 pub fn is_origin(&self) -> bool {
3744 - [Self can also now be used in type definitions.][56366] E.g.
3748 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3751 Cons(T, Box<Self>) // likewise here
3754 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3755 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3759 - [The default allocator has changed from jemalloc to the default allocator on
3760 your system.][55238] The compiler itself on Linux & macOS will still use
3761 jemalloc, but programs compiled with it will use the system allocator.
3762 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3766 - [`PathBuf` now implements `FromStr`.][55148]
3767 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3768 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3769 easily debug expressions in your rust program. E.g.
3772 let b = dbg!(a * 2) + 1;
3773 // ^-- prints: [src/main.rs:4] a * 2 = 4
3777 The following APIs are now `const` functions and can be used in a
3781 - [`UnsafeCell::get`]
3782 - [`char::is_ascii`]
3784 - [`ManuallyDrop::new`]
3785 - [`ManuallyDrop::into_inner`]
3786 - [`RangeInclusive::start`]
3787 - [`RangeInclusive::end`]
3788 - [`NonNull::as_ptr`]
3791 - [`Duration::as_secs`]
3792 - [`Duration::subsec_millis`]
3793 - [`Duration::subsec_micros`]
3794 - [`Duration::subsec_nanos`]
3796 - [`Ipv4Addr::is_unspecified`]
3798 - [`Ipv6Addr::octets`]
3802 - [`i8::to_be_bytes`]
3803 - [`i8::to_le_bytes`]
3804 - [`i8::to_ne_bytes`]
3805 - [`i8::from_be_bytes`]
3806 - [`i8::from_le_bytes`]
3807 - [`i8::from_ne_bytes`]
3808 - [`i16::to_be_bytes`]
3809 - [`i16::to_le_bytes`]
3810 - [`i16::to_ne_bytes`]
3811 - [`i16::from_be_bytes`]
3812 - [`i16::from_le_bytes`]
3813 - [`i16::from_ne_bytes`]
3814 - [`i32::to_be_bytes`]
3815 - [`i32::to_le_bytes`]
3816 - [`i32::to_ne_bytes`]
3817 - [`i32::from_be_bytes`]
3818 - [`i32::from_le_bytes`]
3819 - [`i32::from_ne_bytes`]
3820 - [`i64::to_be_bytes`]
3821 - [`i64::to_le_bytes`]
3822 - [`i64::to_ne_bytes`]
3823 - [`i64::from_be_bytes`]
3824 - [`i64::from_le_bytes`]
3825 - [`i64::from_ne_bytes`]
3826 - [`i128::to_be_bytes`]
3827 - [`i128::to_le_bytes`]
3828 - [`i128::to_ne_bytes`]
3829 - [`i128::from_be_bytes`]
3830 - [`i128::from_le_bytes`]
3831 - [`i128::from_ne_bytes`]
3832 - [`isize::to_be_bytes`]
3833 - [`isize::to_le_bytes`]
3834 - [`isize::to_ne_bytes`]
3835 - [`isize::from_be_bytes`]
3836 - [`isize::from_le_bytes`]
3837 - [`isize::from_ne_bytes`]
3838 - [`u8::to_be_bytes`]
3839 - [`u8::to_le_bytes`]
3840 - [`u8::to_ne_bytes`]
3841 - [`u8::from_be_bytes`]
3842 - [`u8::from_le_bytes`]
3843 - [`u8::from_ne_bytes`]
3844 - [`u16::to_be_bytes`]
3845 - [`u16::to_le_bytes`]
3846 - [`u16::to_ne_bytes`]
3847 - [`u16::from_be_bytes`]
3848 - [`u16::from_le_bytes`]
3849 - [`u16::from_ne_bytes`]
3850 - [`u32::to_be_bytes`]
3851 - [`u32::to_le_bytes`]
3852 - [`u32::to_ne_bytes`]
3853 - [`u32::from_be_bytes`]
3854 - [`u32::from_le_bytes`]
3855 - [`u32::from_ne_bytes`]
3856 - [`u64::to_be_bytes`]
3857 - [`u64::to_le_bytes`]
3858 - [`u64::to_ne_bytes`]
3859 - [`u64::from_be_bytes`]
3860 - [`u64::from_le_bytes`]
3861 - [`u64::from_ne_bytes`]
3862 - [`u128::to_be_bytes`]
3863 - [`u128::to_le_bytes`]
3864 - [`u128::to_ne_bytes`]
3865 - [`u128::from_be_bytes`]
3866 - [`u128::from_le_bytes`]
3867 - [`u128::from_ne_bytes`]
3868 - [`usize::to_be_bytes`]
3869 - [`usize::to_le_bytes`]
3870 - [`usize::to_ne_bytes`]
3871 - [`usize::from_be_bytes`]
3872 - [`usize::from_le_bytes`]
3873 - [`usize::from_ne_bytes`]
3877 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3878 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3882 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3886 - [The argument types for AVX's
3887 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3888 been changed from `*const` to `*mut` as the previous implementation
3892 [55148]: https://github.com/rust-lang/rust/pull/55148/
3893 [55238]: https://github.com/rust-lang/rust/pull/55238/
3894 [55280]: https://github.com/rust-lang/rust/pull/55280/
3895 [55610]: https://github.com/rust-lang/rust/pull/55610/
3896 [55663]: https://github.com/rust-lang/rust/pull/55663/
3897 [55702]: https://github.com/rust-lang/rust/pull/55702/
3898 [55837]: https://github.com/rust-lang/rust/pull/55837/
3899 [55843]: https://github.com/rust-lang/rust/pull/55843/
3900 [56072]: https://github.com/rust-lang/rust/pull/56072/
3901 [56245]: https://github.com/rust-lang/rust/pull/56245/
3902 [56365]: https://github.com/rust-lang/rust/pull/56365/
3903 [56366]: https://github.com/rust-lang/rust/pull/56366/
3904 [56395]: https://github.com/rust-lang/rust/pull/56395/
3905 [56759]: https://github.com/rust-lang/rust/pull/56759/
3906 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3907 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3908 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3909 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3910 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3911 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3912 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3913 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3914 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3915 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3916 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3917 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3918 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3919 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3920 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3921 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3922 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3923 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3924 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3925 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3926 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3927 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3928 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3929 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3930 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3931 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3932 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3933 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3934 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3935 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3936 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3937 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3938 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3939 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3940 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3941 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3942 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3943 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3944 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3945 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3946 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3947 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3948 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3949 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3950 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3951 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3952 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3953 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3954 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3955 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3956 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3957 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3958 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3959 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3960 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3961 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3962 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3963 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3964 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3965 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3966 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3967 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3968 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3969 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3970 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3971 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3972 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3973 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3974 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3975 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3976 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3977 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3978 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3979 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3980 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3981 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3982 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3983 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3984 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3985 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3986 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3987 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3988 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3989 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3990 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3991 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3992 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3993 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3994 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3995 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3996 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3997 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3998 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4001 Version 1.31.1 (2018-12-20)
4002 ===========================
4004 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4005 - [Fix broken go-to-definition in RLS][rls/1171]
4006 - [Fix infinite loop on hover in RLS][rls/1170]
4008 [56562]: https://github.com/rust-lang/rust/pull/56562
4009 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4010 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4012 Version 1.31.0 (2018-12-06)
4013 ==========================
4017 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4018 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4019 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4020 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4022 - [You can now define and use `const` functions.][54835] These are currently
4023 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4024 [language reference][const-reference] for what exactly is available.
4025 - [You can now use tool lints, which allow you to scope lints from external
4026 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4027 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4028 a crate, not just in exported functions.][54451]
4029 - [You can now use parentheses in pattern matches.][54497]
4033 - [Updated musl to 1.1.20][54430]
4037 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4038 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4039 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4040 into `Option<&mut T>` using the `From` trait.][53218]
4041 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4046 - [`slice::align_to`]
4047 - [`slice::align_to_mut`]
4048 - [`slice::chunks_exact`]
4049 - [`slice::chunks_exact_mut`]
4050 - [`slice::rchunks`]
4051 - [`slice::rchunks_mut`]
4052 - [`slice::rchunks_exact`]
4053 - [`slice::rchunks_exact_mut`]
4054 - [`Option::replace`]
4058 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4059 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4060 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4062 [52813]: https://github.com/rust-lang/rust/pull/52813/
4063 [53218]: https://github.com/rust-lang/rust/pull/53218/
4064 [53555]: https://github.com/rust-lang/rust/issues/53555/
4065 [54057]: https://github.com/rust-lang/rust/pull/54057/
4066 [54240]: https://github.com/rust-lang/rust/pull/54240/
4067 [54430]: https://github.com/rust-lang/rust/pull/54430/
4068 [54451]: https://github.com/rust-lang/rust/pull/54451/
4069 [54497]: https://github.com/rust-lang/rust/pull/54497/
4070 [54778]: https://github.com/rust-lang/rust/pull/54778/
4071 [54835]: https://github.com/rust-lang/rust/pull/54835/
4072 [54870]: https://github.com/rust-lang/rust/pull/54870/
4073 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4074 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4075 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4076 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4077 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4078 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4079 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4080 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4081 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4082 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4083 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4084 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4085 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4086 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4088 Version 1.30.1 (2018-11-08)
4089 ===========================
4091 - [Fixed overflow ICE in rustdoc][54199]
4092 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4094 [54199]: https://github.com/rust-lang/rust/pull/54199
4095 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4097 Version 1.30.0 (2018-10-25)
4098 ==========================
4102 - [Procedural macros are now available.][52081] These kinds of macros allow for
4103 more powerful code generation. There is a [new chapter available][proc-macros]
4104 in the Rust Programming Language book that goes further in depth.
4105 - [You can now use keywords as identifiers using the raw identifiers
4106 syntax (`r#`),][53236] e.g. `let r#for = true;`
4107 - [Using anonymous parameters in traits is now deprecated with a warning and
4108 will be a hard error in the 2018 edition.][53272]
4109 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4110 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4111 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4112 Previously, using a external crate in a module without a use statement
4113 required `let json = ::serde_json::from_str(foo);` but can now be written
4114 as `let json = serde_json::from_str(foo);`.
4115 - [You can now apply the `#[used]` attribute to static items to prevent the
4116 compiler from optimising them away, even if they appear to be unused,][51363]
4117 e.g. `#[used] static FOO: u32 = 1;`
4118 - [You can now import and reexport macros from other crates with the `use`
4119 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4120 the root module of the crate. If your macro relies on calling other local
4121 macros, it is recommended to export with the
4122 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4124 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4125 using the `vis` specifier.][53370]
4126 - [Non-macro attributes now allow all forms of literals, not just
4127 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4128 write `#[attr(true)]`.
4129 - [You can now specify a function to handle a panic in the Rust runtime with the
4130 `#[panic_handler]` attribute.][51366]
4134 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4135 - [Added the `aarch64-unknown-netbsd` target][53165]
4136 - [Upgraded to LLVM 8.][53611]
4140 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4144 - [`Ipv4Addr::BROADCAST`]
4145 - [`Ipv4Addr::LOCALHOST`]
4146 - [`Ipv4Addr::UNSPECIFIED`]
4147 - [`Ipv6Addr::LOCALHOST`]
4148 - [`Ipv6Addr::UNSPECIFIED`]
4149 - [`Iterator::find_map`]
4151 The following methods are replacement methods for `trim_left`, `trim_right`,
4152 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4154 - [`str::trim_end_matches`]
4156 - [`str::trim_start_matches`]
4157 - [`str::trim_start`]
4161 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4162 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4163 equivalent to calling `rustdoc --error-format=json`.
4164 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4168 - [`rustdoc` allows you to specify what edition to treat your code as with the
4169 `--edition` option.][54057]
4170 - [`rustdoc` now has the `--color` (specify whether to output color) and
4171 `--error-format` (specify error format, e.g. `json`) options.][53003]
4172 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4173 debug symbols.][53774]
4174 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4175 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4177 [50911]: https://github.com/rust-lang/rust/pull/50911/
4178 [51363]: https://github.com/rust-lang/rust/pull/51363/
4179 [51366]: https://github.com/rust-lang/rust/pull/51366/
4180 [52081]: https://github.com/rust-lang/rust/pull/52081/
4181 [53003]: https://github.com/rust-lang/rust/pull/53003/
4182 [53033]: https://github.com/rust-lang/rust/pull/53033/
4183 [53044]: https://github.com/rust-lang/rust/pull/53044/
4184 [53165]: https://github.com/rust-lang/rust/pull/53165/
4185 [53611]: https://github.com/rust-lang/rust/pull/53611/
4186 [53213]: https://github.com/rust-lang/rust/pull/53213/
4187 [53236]: https://github.com/rust-lang/rust/pull/53236/
4188 [53272]: https://github.com/rust-lang/rust/pull/53272/
4189 [53370]: https://github.com/rust-lang/rust/pull/53370/
4190 [53459]: https://github.com/rust-lang/rust/pull/53459/
4191 [53774]: https://github.com/rust-lang/rust/pull/53774/
4192 [53822]: https://github.com/rust-lang/rust/pull/53822/
4193 [54057]: https://github.com/rust-lang/rust/pull/54057/
4194 [54146]: https://github.com/rust-lang/rust/pull/54146/
4195 [54404]: https://github.com/rust-lang/rust/pull/54404/
4196 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4197 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4198 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4199 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4201 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4202 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4203 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4204 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4205 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4206 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4207 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4208 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4209 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4210 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4213 Version 1.29.2 (2018-10-11)
4214 ===========================
4216 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4217 - The `rls-preview` component on the windows-gnu targets has been restored.
4219 [54639]: https://github.com/rust-lang/rust/pull/54639
4222 Version 1.29.1 (2018-09-25)
4223 ===========================
4228 - The standard library's `str::repeat` function contained an out of bounds write
4229 caused by an integer overflow. This has been fixed by deterministically
4230 panicking when an overflow happens.
4232 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4236 Version 1.29.0 (2018-09-13)
4237 ==========================
4241 - [Bumped minimum LLVM version to 5.0.][51899]
4242 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4243 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4244 - [Upgraded to LLVM 7.][51966]
4248 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4249 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4250 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4251 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4253 - [`Cell<T>` now allows `T` to be unsized.][50494]
4254 - [`SocketAddr` is now stable on Redox.][52656]
4259 - [`Iterator::flatten`]
4264 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4265 `--locked` to disable this behavior.
4266 - [`cargo-install` will now allow you to cross compile an install
4267 using `--target`.][cargo/5614]
4268 - [Added the `cargo-fix` subcommand to automatically move project code from
4269 2015 edition to 2018.][cargo/5723]
4270 - [`cargo doc` can now optionally document private types using the
4271 `--document-private-items` flag.][cargo/5543]
4275 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4276 the specified level to that level.][52354] For example `--cap-lints warn`
4277 will demote `deny` and `forbid` lints to `warn`.
4278 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4279 fails and `101` if there is a panic.][52197]
4280 - [A preview of clippy has been made available through rustup.][51122]
4281 You can install the preview with `rustup component add clippy-preview`.
4285 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4286 Use `str::get_unchecked(begin..end)` instead.
4287 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4288 Consider using the `home_dir` function from
4289 https://crates.io/crates/dirs instead.
4290 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4291 - [`cfg` attributes and `--cfg` command line flags are now more
4292 strictly validated.][53893]
4294 [53893]: https://github.com/rust-lang/rust/pull/53893/
4295 [52861]: https://github.com/rust-lang/rust/pull/52861/
4296 [51966]: https://github.com/rust-lang/rust/pull/51966/
4297 [52656]: https://github.com/rust-lang/rust/pull/52656/
4298 [52239]: https://github.com/rust-lang/rust/pull/52239/
4299 [52330]: https://github.com/rust-lang/rust/pull/52330/
4300 [52354]: https://github.com/rust-lang/rust/pull/52354/
4301 [52402]: https://github.com/rust-lang/rust/pull/52402/
4302 [52103]: https://github.com/rust-lang/rust/pull/52103/
4303 [52197]: https://github.com/rust-lang/rust/pull/52197/
4304 [51807]: https://github.com/rust-lang/rust/pull/51807/
4305 [51899]: https://github.com/rust-lang/rust/pull/51899/
4306 [51912]: https://github.com/rust-lang/rust/pull/51912/
4307 [51511]: https://github.com/rust-lang/rust/pull/51511/
4308 [51619]: https://github.com/rust-lang/rust/pull/51619/
4309 [51656]: https://github.com/rust-lang/rust/pull/51656/
4310 [51178]: https://github.com/rust-lang/rust/pull/51178/
4311 [51122]: https://github.com/rust-lang/rust/pull/51122
4312 [50494]: https://github.com/rust-lang/rust/pull/50494/
4313 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4314 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4315 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4316 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4317 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4318 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4319 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4322 Version 1.28.0 (2018-08-02)
4323 ===========================
4327 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4328 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4329 the inner type across Foreign Function Interface (FFI) boundaries.
4330 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4331 and can now be used as identifiers.][51196]
4332 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4333 stable.][51241] This will allow users to specify a global allocator for
4335 - [Unit test functions marked with the `#[test]` attribute can now return
4336 `Result<(), E: Debug>` in addition to `()`.][51298]
4337 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4338 allows macros to easily target lifetimes.
4342 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4343 prioritise making smaller binary sizes. `z` is the same as `s` with the
4344 exception that it does not vectorise loops, which typically results in an even
4346 - [The short error format is now stable.][49546] Specified with
4347 `--error-format=short` this option will provide a more compressed output of
4348 rust error messages.
4349 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4350 - [Reduced the number of allocations in the macro parser.][50855] This can
4351 improve compile times of macro heavy crates on average by 5%.
4355 - [Implemented `Default` for `&mut str`.][51306]
4356 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4357 - [Implemented `Extend` for `()`.][50234]
4358 - [The `Debug` implementation of `time::Duration` should now be more easily
4359 human readable.][50364] Previously a `Duration` of one second would printed as
4360 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4361 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4362 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4363 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4364 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4365 for `PathBuf`.][50170]
4366 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4367 and `Wrapping<i128>`.][50465]
4368 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4369 possible.][51050] This can provide up to a 40% speed increase.
4370 - [Improved error messages when using `format!`.][50610]
4374 - [`Iterator::step_by`]
4375 - [`Path::ancestors`]
4376 - [`SystemTime::UNIX_EPOCH`]
4377 - [`alloc::GlobalAlloc`]
4379 - [`alloc::LayoutErr`]
4382 - [`alloc::alloc_zeroed`]
4383 - [`alloc::dealloc`]
4384 - [`alloc::realloc`]
4385 - [`alloc::handle_alloc_error`]
4386 - [`btree_map::Entry::or_default`]
4387 - [`fmt::Alignment`]
4388 - [`hash_map::Entry::or_default`]
4389 - [`iter::repeat_with`]
4390 - [`num::NonZeroUsize`]
4391 - [`num::NonZeroU128`]
4392 - [`num::NonZeroU16`]
4393 - [`num::NonZeroU32`]
4394 - [`num::NonZeroU64`]
4395 - [`num::NonZeroU8`]
4396 - [`ops::RangeBounds`]
4397 - [`slice::SliceIndex`]
4398 - [`slice::from_mut`]
4399 - [`slice::from_ref`]
4400 - [`{Any + Send + Sync}::downcast_mut`]
4401 - [`{Any + Send + Sync}::downcast_ref`]
4402 - [`{Any + Send + Sync}::is`]
4406 - [Cargo will now no longer allow you to publish crates with build scripts that
4407 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4408 considered to be immutable.
4412 - [The `suggestion_applicability` field in `rustc`'s json output is now
4413 stable.][50486] This will allow dev tools to check whether a code suggestion
4414 would apply to them.
4418 - [Rust will consider trait objects with duplicated constraints to be the same
4419 type as without the duplicated constraint.][51276] For example the below code will
4420 now fail to compile.
4425 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4428 impl Trait + Send + Send {
4429 fn test(&self) { println!("two"); }
4433 [49546]: https://github.com/rust-lang/rust/pull/49546/
4434 [50143]: https://github.com/rust-lang/rust/pull/50143/
4435 [50170]: https://github.com/rust-lang/rust/pull/50170/
4436 [50234]: https://github.com/rust-lang/rust/pull/50234/
4437 [50265]: https://github.com/rust-lang/rust/pull/50265/
4438 [50364]: https://github.com/rust-lang/rust/pull/50364/
4439 [50385]: https://github.com/rust-lang/rust/pull/50385/
4440 [50465]: https://github.com/rust-lang/rust/pull/50465/
4441 [50486]: https://github.com/rust-lang/rust/pull/50486/
4442 [50554]: https://github.com/rust-lang/rust/pull/50554/
4443 [50610]: https://github.com/rust-lang/rust/pull/50610/
4444 [50855]: https://github.com/rust-lang/rust/pull/50855/
4445 [51050]: https://github.com/rust-lang/rust/pull/51050/
4446 [51196]: https://github.com/rust-lang/rust/pull/51196/
4447 [51200]: https://github.com/rust-lang/rust/pull/51200/
4448 [51241]: https://github.com/rust-lang/rust/pull/51241/
4449 [51276]: https://github.com/rust-lang/rust/pull/51276/
4450 [51298]: https://github.com/rust-lang/rust/pull/51298/
4451 [51306]: https://github.com/rust-lang/rust/pull/51306/
4452 [51562]: https://github.com/rust-lang/rust/pull/51562/
4453 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4454 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4455 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4456 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4457 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4458 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4459 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4460 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4461 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4462 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4463 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4464 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4465 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4466 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4467 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4468 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4469 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4470 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4471 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4472 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4473 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4474 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4475 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4476 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4477 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4478 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4479 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4480 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4481 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4482 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4484 Version 1.27.2 (2018-07-20)
4485 ===========================
4490 - The borrow checker was fixed to avoid potential unsoundness when using
4491 match ergonomics: [#52213][52213].
4493 [52213]: https://github.com/rust-lang/rust/issues/52213
4495 Version 1.27.1 (2018-07-10)
4496 ===========================
4501 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4502 when running, which enabled executing code as some other user on a
4503 given machine. This release fixes that vulnerability; you can read
4504 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4506 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4511 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4512 match ergonomics: [#51415][51415], [#49534][49534].
4514 [51415]: https://github.com/rust-lang/rust/issues/51415
4515 [49534]: https://github.com/rust-lang/rust/issues/49534
4516 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4517 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4519 Version 1.27.0 (2018-06-21)
4520 ==========================
4524 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4525 be used as an identifier.
4526 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4527 bare `Trait` syntax, and should make it clearer when being used in tandem with
4528 `impl Trait` because it is equivalent to the following syntax:
4529 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4530 `Box<Trait> == Box<dyn Trait>`.
4531 - [Attributes on generic parameters such as types and lifetimes are
4532 now stable.][48851] e.g.
4533 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4534 - [The `#[must_use]` attribute can now also be used on functions as well as
4535 types.][48925] It provides a lint that by default warns users when the
4536 value returned by a function has not been used.
4540 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4544 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4545 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4546 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4547 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4548 the `cfg` attribute.
4549 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4550 std are now available in core.][49896]
4551 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4553 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4554 that the operation isn't done in place.
4555 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4556 the `#[must_use]` attribute][49533] to warn about unused potentially
4557 expensive allocations.
4561 - [`DoubleEndedIterator::rfind`]
4562 - [`DoubleEndedIterator::rfold`]
4563 - [`DoubleEndedIterator::try_rfold`]
4564 - [`Duration::from_micros`]
4565 - [`Duration::from_nanos`]
4566 - [`Duration::subsec_micros`]
4567 - [`Duration::subsec_millis`]
4568 - [`HashMap::remove_entry`]
4569 - [`Iterator::try_fold`]
4570 - [`Iterator::try_for_each`]
4572 - [`Option::filter`]
4573 - [`String::replace_range`]
4574 - [`Take::set_limit`]
4575 - [`hint::unreachable_unchecked`]
4576 - [`os::unix::process::parent_id`]
4577 - [`ptr::swap_nonoverlapping`]
4578 - [`slice::rsplit_mut`]
4580 - [`slice::swap_with_slice`]
4584 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4585 `readme`, and `repository` fields.][cargo/5386]
4586 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4587 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4588 a different directory than `target` for placing compilation artifacts.
4589 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4590 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4591 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4592 where cargo would infer a binary, Cargo will produce a warning. You can
4593 disable this feature ahead of time by setting any of the following to false:
4594 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4595 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4596 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4600 - [Added “The Rustc book” into the official documentation.][49707]
4601 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4602 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4606 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4607 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4608 compile, `"".is_empty()` will still compile.
4609 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4610 will only print the inner type.][48553] E.g.
4611 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4612 not `AtomicBool(true)`.
4613 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4614 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4615 alignment should cover all use cases.
4616 - The `.description()` method on the `std::error::Error` trait
4617 [has been soft-deprecated][50163]. It is no longer required to implement it.
4619 [48553]: https://github.com/rust-lang/rust/pull/48553/
4620 [48851]: https://github.com/rust-lang/rust/pull/48851/
4621 [48925]: https://github.com/rust-lang/rust/pull/48925/
4622 [49533]: https://github.com/rust-lang/rust/pull/49533/
4623 [49623]: https://github.com/rust-lang/rust/pull/49623/
4624 [49630]: https://github.com/rust-lang/rust/pull/49630/
4625 [49664]: https://github.com/rust-lang/rust/pull/49664/
4626 [49699]: https://github.com/rust-lang/rust/pull/49699/
4627 [49707]: https://github.com/rust-lang/rust/pull/49707/
4628 [49719]: https://github.com/rust-lang/rust/pull/49719/
4629 [49896]: https://github.com/rust-lang/rust/pull/49896/
4630 [49968]: https://github.com/rust-lang/rust/pull/49968/
4631 [50163]: https://github.com/rust-lang/rust/pull/50163
4632 [50177]: https://github.com/rust-lang/rust/pull/50177/
4633 [50378]: https://github.com/rust-lang/rust/pull/50378/
4634 [50398]: https://github.com/rust-lang/rust/pull/50398/
4635 [50423]: https://github.com/rust-lang/rust/pull/50423/
4636 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4637 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4638 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4639 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4640 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4641 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4642 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4643 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4644 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4645 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4646 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4647 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4648 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4649 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4650 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4651 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4652 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4653 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4654 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4655 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4656 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4657 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4658 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4659 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4660 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4661 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4662 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4663 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4664 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4665 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4668 Version 1.26.2 (2018-06-05)
4669 ==========================
4674 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4676 [51117]: https://github.com/rust-lang/rust/issues/51117
4679 Version 1.26.1 (2018-05-29)
4680 ==========================
4685 - [RLS now works on Windows.][50646]
4686 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4692 - [`fn main() -> impl Trait` no longer works for non-Termination
4694 This reverts an accidental stabilization.
4695 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4696 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4698 [50646]: https://github.com/rust-lang/rust/issues/50646
4699 [50656]: https://github.com/rust-lang/rust/pull/50656
4700 [50812]: https://github.com/rust-lang/rust/pull/50812
4701 [50950]: https://github.com/rust-lang/rust/issues/50950
4702 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4704 Version 1.26.0 (2018-05-10)
4705 ==========================
4709 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4710 implement either or both traits.][49299]
4711 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4712 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4713 lifetime can be elided.][49458]
4714 - [`impl Trait` is now stable allowing you to have abstract types in returns
4715 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4716 `fn open(path: impl AsRef<Path>)`.
4717 - [Pattern matching will now automatically apply dereferences.][49394]
4718 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4719 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4720 - [A lot of operations are now available in a const context.][46882] E.g. You
4721 can now index into constant arrays, reference and dereference into constants,
4722 and use tuple struct constructors.
4723 - [Fixed entry slice patterns are now stable.][48516] E.g.
4725 let points = [1, 2, 3, 4];
4727 [1, 2, 3, 4] => println!("All points were sequential."),
4728 _ => println!("Not all points were sequential."),
4735 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4736 - [Fixed exponential projection complexity on nested types.][48296]
4737 This can provide up to a ~12% reduction in compile times for certain crates.
4738 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4739 to remap path prefixes outputted by the compiler.
4740 - [Added `powerpc-unknown-netbsd` target.][48281]
4744 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4745 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4746 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4747 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4748 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4749 - [`ascii::escape_default` is now available in libcore.][48735]
4750 - [Trailing commas are now supported in std and core macros.][48056]
4751 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4752 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4757 - [`*const T::copy_to_nonoverlapping`]
4758 - [`*const T::copy_to`]
4759 - [`*const T::read_unaligned`]
4760 - [`*const T::read_volatile`]
4761 - [`*const T::read`]
4763 - [`*const T::wrapping_add`]
4764 - [`*const T::wrapping_sub`]
4766 - [`*mut T::copy_to_nonoverlapping`]
4767 - [`*mut T::copy_to`]
4768 - [`*mut T::read_unaligned`]
4769 - [`*mut T::read_volatile`]
4771 - [`*mut T::replace`]
4774 - [`*mut T::wrapping_add`]
4775 - [`*mut T::wrapping_sub`]
4776 - [`*mut T::write_bytes`]
4777 - [`*mut T::write_unaligned`]
4778 - [`*mut T::write_volatile`]
4781 - [`FromUtf8Error::as_bytes`]
4782 - [`LocalKey::try_with`]
4783 - [`Option::cloned`]
4784 - [`btree_map::Entry::and_modify`]
4785 - [`fs::read_to_string`]
4788 - [`hash_map::Entry::and_modify`]
4789 - [`iter::FusedIterator`]
4790 - [`ops::RangeInclusive`]
4791 - [`ops::RangeToInclusive`]
4793 - [`slice::rotate_left`]
4794 - [`slice::rotate_right`]
4795 - [`String::retain`]
4800 - [Cargo will now output path to custom commands when `-v` is
4801 passed with `--list`][cargo/5041]
4802 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4806 - [The second edition of "The Rust Programming Language" book is now recommended
4807 over the first.][48404]
4812 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4813 syntax is now invalid.
4815 use std::ops::Fn as dyn;
4816 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4818 - [The result of dereferences are no longer promoted to `'static`.][47408]
4822 const PAIR: &(i32, i32) = &(0, 1);
4823 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4826 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4827 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4829 - [Removed hoedown from rustdoc.][48274]
4830 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4832 [46882]: https://github.com/rust-lang/rust/pull/46882
4833 [47379]: https://github.com/rust-lang/rust/pull/47379
4834 [47408]: https://github.com/rust-lang/rust/pull/47408
4835 [47813]: https://github.com/rust-lang/rust/pull/47813
4836 [48056]: https://github.com/rust-lang/rust/pull/48056
4837 [48125]: https://github.com/rust-lang/rust/pull/48125
4838 [48166]: https://github.com/rust-lang/rust/pull/48166
4839 [48235]: https://github.com/rust-lang/rust/pull/48235
4840 [48274]: https://github.com/rust-lang/rust/pull/48274
4841 [48281]: https://github.com/rust-lang/rust/pull/48281
4842 [48296]: https://github.com/rust-lang/rust/pull/48296
4843 [48326]: https://github.com/rust-lang/rust/pull/48326
4844 [48359]: https://github.com/rust-lang/rust/pull/48359
4845 [48404]: https://github.com/rust-lang/rust/pull/48404
4846 [48481]: https://github.com/rust-lang/rust/pull/48481
4847 [48516]: https://github.com/rust-lang/rust/pull/48516
4848 [48628]: https://github.com/rust-lang/rust/pull/48628
4849 [48629]: https://github.com/rust-lang/rust/pull/48629
4850 [48657]: https://github.com/rust-lang/rust/pull/48657
4851 [48735]: https://github.com/rust-lang/rust/pull/48735
4852 [48978]: https://github.com/rust-lang/rust/pull/48978
4853 [49101]: https://github.com/rust-lang/rust/pull/49101
4854 [49109]: https://github.com/rust-lang/rust/pull/49109
4855 [49121]: https://github.com/rust-lang/rust/pull/49121
4856 [49162]: https://github.com/rust-lang/rust/pull/49162
4857 [49184]: https://github.com/rust-lang/rust/pull/49184
4858 [49234]: https://github.com/rust-lang/rust/pull/49234
4859 [49255]: https://github.com/rust-lang/rust/pull/49255
4860 [49299]: https://github.com/rust-lang/rust/pull/49299
4861 [49305]: https://github.com/rust-lang/rust/pull/49305
4862 [49394]: https://github.com/rust-lang/rust/pull/49394
4863 [49458]: https://github.com/rust-lang/rust/pull/49458
4864 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4865 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4866 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4867 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4868 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4869 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4870 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4871 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4872 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4873 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4874 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4875 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4876 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4877 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4878 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4879 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4880 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4881 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4882 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4883 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4884 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4885 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4886 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4887 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4888 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4889 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4890 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4891 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4892 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4893 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4894 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4895 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4896 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4897 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4898 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4899 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4900 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4901 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4902 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4903 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4904 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4905 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4908 Version 1.25.0 (2018-03-29)
4909 ==========================
4913 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4914 - [You can now use nested groups of imports.][47948]
4915 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4916 - [You can now have `|` at the start of a match arm.][47947] e.g.
4918 enum Foo { A, B, C }
4924 | Foo::B => println!("AB"),
4925 | Foo::C => println!("C"),
4932 - [Upgraded to LLVM 6.][47828]
4933 - [Added `-C lto=val` option.][47521]
4934 - [Added `i586-unknown-linux-musl` target][47282]
4938 - [Impl Send for `process::Command` on Unix.][47760]
4939 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4940 - [`UnsafeCell::into_inner` is now safe.][47204]
4941 - [Implement libstd for CloudABI.][47268]
4942 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4943 - [Implement `AsRef<Path>` for Component][46985]
4944 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4945 - [Moved `Duration` to libcore.][46666]
4949 - [`Location::column`]
4952 The following functions can now be used in a constant expression.
4953 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4954 - [`Duration::new`][47300]
4955 - [`Duration::from_secs`][47300]
4956 - [`Duration::from_millis`][47300]
4960 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4961 - [`cargo new` now defaults to creating a binary crate, instead of a
4962 library crate.][cargo/5029]
4966 - [Rust by example is now shipped with new releases][46196]
4970 - [Deprecated `net::lookup_host`.][47510]
4971 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4972 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4973 around indexing operations (see [#47349][47349]). This has been fixed (which also
4974 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4975 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4977 [33903]: https://github.com/rust-lang/rust/pull/33903
4978 [47947]: https://github.com/rust-lang/rust/pull/47947
4979 [47948]: https://github.com/rust-lang/rust/pull/47948
4980 [47760]: https://github.com/rust-lang/rust/pull/47760
4981 [47790]: https://github.com/rust-lang/rust/pull/47790
4982 [47828]: https://github.com/rust-lang/rust/pull/47828
4983 [47398]: https://github.com/rust-lang/rust/pull/47398
4984 [47510]: https://github.com/rust-lang/rust/pull/47510
4985 [47521]: https://github.com/rust-lang/rust/pull/47521
4986 [47204]: https://github.com/rust-lang/rust/pull/47204
4987 [47251]: https://github.com/rust-lang/rust/pull/47251
4988 [47268]: https://github.com/rust-lang/rust/pull/47268
4989 [47282]: https://github.com/rust-lang/rust/pull/47282
4990 [47300]: https://github.com/rust-lang/rust/pull/47300
4991 [47349]: https://github.com/rust-lang/rust/pull/47349
4992 [46931]: https://github.com/rust-lang/rust/pull/46931
4993 [46985]: https://github.com/rust-lang/rust/pull/46985
4994 [47006]: https://github.com/rust-lang/rust/pull/47006
4995 [46830]: https://github.com/rust-lang/rust/pull/46830
4996 [46095]: https://github.com/rust-lang/rust/pull/46095
4997 [46666]: https://github.com/rust-lang/rust/pull/46666
4998 [46196]: https://github.com/rust-lang/rust/pull/46196
4999 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5000 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5001 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5002 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5003 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5006 Version 1.24.1 (2018-03-01)
5007 ==========================
5009 - [Do not abort when unwinding through FFI][48251]
5010 - [Emit UTF-16 files for linker arguments on Windows][48318]
5011 - [Make the error index generator work again][48308]
5012 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5014 [48251]: https://github.com/rust-lang/rust/issues/48251
5015 [48308]: https://github.com/rust-lang/rust/issues/48308
5016 [48318]: https://github.com/rust-lang/rust/issues/48318
5017 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5020 Version 1.24.0 (2018-02-15)
5021 ==========================
5025 - [External `sysv64` ffi is now available.][46528]
5026 eg. `extern "sysv64" fn foo () {}`
5030 - [rustc now uses 16 codegen units by default for release builds.][46910]
5031 For the fastest builds, utilize `codegen-units=1`.
5032 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5033 - [Add `aarch64-unknown-openbsd` support][46760]
5037 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5038 improvement in performance in the majority of cases.
5039 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5040 with Windows.][46798]
5041 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5042 - [impl `From<bool>` for `AtomicBool`][46293]
5043 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5044 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5045 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5046 - [float::from_bits now just uses transmute.][46012] This provides
5047 some optimisations from LLVM.
5048 - [Copied `AsciiExt` methods onto `char`][46077]
5049 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5050 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5051 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5052 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5056 - [`RefCell::replace`]
5058 - [`atomic::spin_loop_hint`]
5060 The following functions can now be used in a constant expression.
5061 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5063 - [`AtomicBool::new`][46287]
5064 - [`AtomicUsize::new`][46287]
5065 - [`AtomicIsize::new`][46287]
5066 - [`AtomicPtr::new`][46287]
5067 - [`Cell::new`][46287]
5068 - [`{integer}::min_value`][46287]
5069 - [`{integer}::max_value`][46287]
5070 - [`mem::size_of`][46287]
5071 - [`mem::align_of`][46287]
5072 - [`ptr::null`][46287]
5073 - [`ptr::null_mut`][46287]
5074 - [`RefCell::new`][46287]
5075 - [`UnsafeCell::new`][46287]
5079 - [Added a `workspace.default-members` config that
5080 overrides implied `--all` in virtual workspaces.][cargo/4743]
5081 - [Enable incremental by default on development builds.][cargo/4817] Also added
5082 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5083 per-project or global basis respectively.
5090 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5091 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5092 in accordance with IETF RFC 4291 §2.2.
5093 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5094 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5095 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5096 - [Leading zeros in tuple struct members is now an error][47084]
5097 - [`column!()` macro is one-based instead of zero-based][46977]
5098 - [`fmt::Arguments` can no longer be shared across threads][45198]
5099 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5100 - [Cargo sets a different working directory for the compiler][cargo/4788]
5102 [44884]: https://github.com/rust-lang/rust/pull/44884
5103 [45198]: https://github.com/rust-lang/rust/pull/45198
5104 [45506]: https://github.com/rust-lang/rust/pull/45506
5105 [45904]: https://github.com/rust-lang/rust/pull/45904
5106 [45990]: https://github.com/rust-lang/rust/pull/45990
5107 [46012]: https://github.com/rust-lang/rust/pull/46012
5108 [46077]: https://github.com/rust-lang/rust/pull/46077
5109 [46094]: https://github.com/rust-lang/rust/pull/46094
5110 [46284]: https://github.com/rust-lang/rust/pull/46284
5111 [46287]: https://github.com/rust-lang/rust/pull/46287
5112 [46293]: https://github.com/rust-lang/rust/pull/46293
5113 [46528]: https://github.com/rust-lang/rust/pull/46528
5114 [46671]: https://github.com/rust-lang/rust/pull/46671
5115 [46713]: https://github.com/rust-lang/rust/pull/46713
5116 [46735]: https://github.com/rust-lang/rust/pull/46735
5117 [46749]: https://github.com/rust-lang/rust/pull/46749
5118 [46760]: https://github.com/rust-lang/rust/pull/46760
5119 [46798]: https://github.com/rust-lang/rust/pull/46798
5120 [46828]: https://github.com/rust-lang/rust/pull/46828
5121 [46831]: https://github.com/rust-lang/rust/pull/46831
5122 [46833]: https://github.com/rust-lang/rust/pull/46833
5123 [46910]: https://github.com/rust-lang/rust/pull/46910
5124 [46977]: https://github.com/rust-lang/rust/pull/46977
5125 [47018]: https://github.com/rust-lang/rust/pull/47018
5126 [47080]: https://github.com/rust-lang/rust/pull/47080
5127 [47084]: https://github.com/rust-lang/rust/pull/47084
5128 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5129 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5130 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5131 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5132 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5133 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5136 Version 1.23.0 (2018-01-04)
5137 ==========================
5141 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5142 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5143 Which should fix some confusing errors in some operations.
5147 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5148 undefined behavior.][45920]
5149 - [rustc now suggests renaming import if names clash.][45660]
5150 - [Display errors/warnings correctly when there are zero-width or
5151 wide characters.][45711]
5152 - [rustc now avoids unnecessary copies of arguments that are
5153 simple bindings][45380] This should improve memory usage on average by 5-10%.
5154 - [Updated musl used to build musl rustc to 1.1.17][45393]
5158 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5159 - [Implement Hash for raw pointers to unsized types][45483]
5160 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5161 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5162 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5163 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5164 and `<*mut T>::as_mut`][44932]
5165 - [Optimized `Thread::{park, unpark}` implementation][45524]
5166 - [Improved `SliceExt::binary_search` performance.][45333]
5167 - [impl `FromIterator<()>` for `()`][45379]
5168 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5176 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5177 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5178 - [Added unit test checking to `cargo check`][cargo/4592]
5179 - [Cargo now lets you install a specific version
5180 using `cargo install --version`][cargo/4637]
5184 - [Releases now ship with the Cargo book documentation.][45692]
5185 - [rustdoc now prints rendering warnings on every run.][45324]
5189 - [Changes have been made to type equality to make it more correct,
5190 in rare cases this could break some code.][45853] [Tracking issue for
5191 further information][45852]
5192 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5193 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5194 Android 9, the minimum supported version is Android 14.
5195 - [Bumped the minimum LLVM to 3.9][45326]
5197 [44042]: https://github.com/rust-lang/rust/pull/44042
5198 [44932]: https://github.com/rust-lang/rust/pull/44932
5199 [45267]: https://github.com/rust-lang/rust/pull/45267
5200 [45324]: https://github.com/rust-lang/rust/pull/45324
5201 [45326]: https://github.com/rust-lang/rust/pull/45326
5202 [45333]: https://github.com/rust-lang/rust/pull/45333
5203 [45379]: https://github.com/rust-lang/rust/pull/45379
5204 [45380]: https://github.com/rust-lang/rust/pull/45380
5205 [45393]: https://github.com/rust-lang/rust/pull/45393
5206 [45435]: https://github.com/rust-lang/rust/pull/45435
5207 [45483]: https://github.com/rust-lang/rust/pull/45483
5208 [45524]: https://github.com/rust-lang/rust/pull/45524
5209 [45571]: https://github.com/rust-lang/rust/pull/45571
5210 [45580]: https://github.com/rust-lang/rust/pull/45580
5211 [45610]: https://github.com/rust-lang/rust/pull/45610
5212 [45660]: https://github.com/rust-lang/rust/pull/45660
5213 [45692]: https://github.com/rust-lang/rust/pull/45692
5214 [45711]: https://github.com/rust-lang/rust/pull/45711
5215 [45772]: https://github.com/rust-lang/rust/pull/45772
5216 [45852]: https://github.com/rust-lang/rust/issues/45852
5217 [45853]: https://github.com/rust-lang/rust/pull/45853
5218 [45887]: https://github.com/rust-lang/rust/pull/45887
5219 [45920]: https://github.com/rust-lang/rust/pull/45920
5220 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5221 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5222 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5225 Version 1.22.1 (2017-11-22)
5226 ==========================
5228 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5230 [46183]: https://github.com/rust-lang/rust/pull/46183
5232 Version 1.22.0 (2017-11-22)
5233 ==========================
5237 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5238 - [Now accepts underscores in unicode escapes][43716]
5239 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5240 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5244 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5245 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5246 This should decrease compile times for debug builds.
5247 - [strict memory alignment now enabled on ARMv6][45094]
5248 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5252 - [Allow atomic operations up to 32 bits
5253 on `armv5te_unknown_linux_gnueabi`][44978]
5254 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5255 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5256 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5257 - [Properly detect overflow in `Instant += Duration`.][44220]
5258 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5259 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5260 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5267 - [Cargo will now build multi file examples in subdirectories of the `examples`
5268 folder that have a `main.rs` file.][cargo/4496]
5269 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5270 the old format will continue to work and can be updated with `cargo update`.
5271 - [Now supports vendoring git repositories][cargo/3992]
5275 - [`libbacktrace` is now available on Apple platforms.][44251]
5276 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5277 This now lets you specify that a given code example will fail to compile.
5281 - [The minimum Android version that rustc can build for has been bumped
5282 to `4.0` from `2.3`][45656]
5283 - [Allowing `T op= &T` for numeric types has broken some type
5284 inference cases][45480]
5287 [42526]: https://github.com/rust-lang/rust/pull/42526
5288 [43017]: https://github.com/rust-lang/rust/pull/43017
5289 [43716]: https://github.com/rust-lang/rust/pull/43716
5290 [43949]: https://github.com/rust-lang/rust/pull/43949
5291 [44015]: https://github.com/rust-lang/rust/pull/44015
5292 [44220]: https://github.com/rust-lang/rust/pull/44220
5293 [44251]: https://github.com/rust-lang/rust/pull/44251
5294 [44287]: https://github.com/rust-lang/rust/pull/44287
5295 [44303]: https://github.com/rust-lang/rust/pull/44303
5296 [44456]: https://github.com/rust-lang/rust/pull/44456
5297 [44466]: https://github.com/rust-lang/rust/pull/44466
5298 [44895]: https://github.com/rust-lang/rust/pull/44895
5299 [44966]: https://github.com/rust-lang/rust/pull/44966
5300 [44978]: https://github.com/rust-lang/rust/pull/44978
5301 [45041]: https://github.com/rust-lang/rust/pull/45041
5302 [45064]: https://github.com/rust-lang/rust/pull/45064
5303 [45075]: https://github.com/rust-lang/rust/pull/45075
5304 [45094]: https://github.com/rust-lang/rust/pull/45094
5305 [45095]: https://github.com/rust-lang/rust/pull/45095
5306 [45480]: https://github.com/rust-lang/rust/issues/45480
5307 [45656]: https://github.com/rust-lang/rust/pull/45656
5308 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5309 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5310 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5317 Version 1.21.0 (2017-10-12)
5318 ==========================
5322 - [You can now use static references for literals.][43838]
5326 let x: &'static u32 = &0;
5329 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5332 my_macro!(Vec<i32>::new); // Always worked
5333 my_macro!(Vec::<i32>::new); // Now works
5338 - [Upgraded jemalloc to 4.5.0][43911]
5339 - [Enabled unwinding panics on Redox][43917]
5340 - [Now runs LLVM in parallel during translation phase.][43506]
5341 This should reduce peak memory usage.
5345 - [Generate builtin impls for `Clone` for all arrays and tuples that
5346 are `T: Clone`][43690]
5347 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5348 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5349 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5354 [`std::mem::discriminant`]
5358 - [You can now call `cargo install` with multiple package names][cargo/4216]
5359 - [Cargo commands inside a virtual workspace will now implicitly
5360 pass `--all`][cargo/4335]
5361 - [Added a `[patch]` section to `Cargo.toml` to handle
5362 prepublication dependencies][cargo/4123] [RFC 1969]
5363 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5364 like patterns][cargo/4270]
5365 - [Added the `--all-targets` option][cargo/4400]
5366 - [Using required dependencies as a feature is now deprecated and emits
5367 a warning][cargo/4364]
5372 - [Cargo docs are moving][43916]
5373 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5374 - [The rustdoc book is now available][43863]
5375 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5376 - [Added a preview of RLS has been made available through rustup][44204]
5377 Install with `rustup component add rls-preview`
5378 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5379 Previously only showed `std::os::unix`.
5383 - [Changes in method matching against higher-ranked types][43880] This may cause
5384 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5385 - [rustc's JSON error output's byte position start at top of file.][42973]
5386 Was previously relative to the rustc's internal `CodeMap` struct which
5387 required the unstable library `libsyntax` to correctly use.
5388 - [`unused_results` lint no longer ignores booleans][43728]
5390 [42565]: https://github.com/rust-lang/rust/pull/42565
5391 [42973]: https://github.com/rust-lang/rust/pull/42973
5392 [43348]: https://github.com/rust-lang/rust/pull/43348
5393 [43459]: https://github.com/rust-lang/rust/pull/43459
5394 [43506]: https://github.com/rust-lang/rust/pull/43506
5395 [43540]: https://github.com/rust-lang/rust/pull/43540
5396 [43690]: https://github.com/rust-lang/rust/pull/43690
5397 [43728]: https://github.com/rust-lang/rust/pull/43728
5398 [43838]: https://github.com/rust-lang/rust/pull/43838
5399 [43863]: https://github.com/rust-lang/rust/pull/43863
5400 [43880]: https://github.com/rust-lang/rust/pull/43880
5401 [43911]: https://github.com/rust-lang/rust/pull/43911
5402 [43916]: https://github.com/rust-lang/rust/pull/43916
5403 [43917]: https://github.com/rust-lang/rust/pull/43917
5404 [44204]: https://github.com/rust-lang/rust/pull/44204
5405 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5406 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5407 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5408 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5409 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5410 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5411 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5412 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5413 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5415 Version 1.20.0 (2017-08-31)
5416 ===========================
5420 - [Associated constants are now stabilised.][42809]
5421 - [A lot of macro bugs are now fixed.][42913]
5426 - [Struct fields are now properly coerced to the expected field type.][42807]
5427 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5428 `wasm32-experimental-emscripten` target.
5429 - [Changed some of the error messages to be more helpful.][42033]
5430 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5432 - [rustc now reports the total number of errors on compilation failure][43015]
5433 previously this was only the number of errors in the pass that failed.
5434 - [Expansion in rustc has been sped up 29x.][42533]
5435 - [added `msp430-none-elf` target.][43099]
5436 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5438 - [Fixes backtraces on Redox][43228]
5439 - [rustc now identifies different versions of same crate when absolute paths of
5440 different types match in an error message.][42826]
5446 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5447 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5449 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5450 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5451 - [Impl `Clone` for `DefaultHasher`.][42799]
5452 - [Impl `Sync` for `SyncSender`.][42397]
5453 - [Impl `FromStr` for `char`][42271]
5454 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5456 - [allow messages in the `unimplemented!()` macro.][42155]
5457 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5458 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5459 - [Upgrade to Unicode 10.0.0][42999]
5460 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5461 - [Skip the main thread's manual stack guard on Linux][43072]
5462 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5463 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5465 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5470 - [`CStr::into_c_string`]
5471 - [`CString::as_c_str`]
5472 - [`CString::into_boxed_c_str`]
5473 - [`Chain::get_mut`]
5474 - [`Chain::get_ref`]
5475 - [`Chain::into_inner`]
5476 - [`Option::get_or_insert_with`]
5477 - [`Option::get_or_insert`]
5478 - [`OsStr::into_os_string`]
5479 - [`OsString::into_boxed_os_str`]
5482 - [`Utf8Error::error_len`]
5483 - [`char::EscapeDebug`]
5484 - [`char::escape_debug`]
5485 - [`compile_error!`]
5486 - [`f32::from_bits`]
5488 - [`f64::from_bits`]
5490 - [`mem::ManuallyDrop`]
5491 - [`slice::sort_unstable_by_key`]
5492 - [`slice::sort_unstable_by`]
5493 - [`slice::sort_unstable`]
5494 - [`str::from_boxed_utf8_unchecked`]
5495 - [`str::as_bytes_mut`]
5496 - [`str::as_bytes_mut`]
5497 - [`str::from_utf8_mut`]
5498 - [`str::from_utf8_unchecked_mut`]
5500 - [`str::get_unchecked_mut`]
5501 - [`str::get_unchecked`]
5503 - [`str::into_boxed_bytes`]
5508 - [Cargo API token location moved from `~/.cargo/config` to
5509 `~/.cargo/credentials`.][cargo/3978]
5510 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5511 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5512 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5513 - [You can now specify version of a binary when installed through
5514 `cargo install` using `--vers`.][cargo/4229]
5515 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5516 failure.][cargo/4248]
5517 - [Changed the convention around which file is the crate root.][cargo/4259]
5518 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5519 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5524 - [Functions with `'static` in their return types will now not be as usable as
5525 if they were using lifetime parameters instead.][42417]
5526 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5527 takes the sign of NaN into account where previously didn't.][42430]
5529 [42033]: https://github.com/rust-lang/rust/pull/42033
5530 [42155]: https://github.com/rust-lang/rust/pull/42155
5531 [42271]: https://github.com/rust-lang/rust/pull/42271
5532 [42397]: https://github.com/rust-lang/rust/pull/42397
5533 [42417]: https://github.com/rust-lang/rust/pull/42417
5534 [42430]: https://github.com/rust-lang/rust/pull/42430
5535 [42431]: https://github.com/rust-lang/rust/pull/42431
5536 [42533]: https://github.com/rust-lang/rust/pull/42533
5537 [42571]: https://github.com/rust-lang/rust/pull/42571
5538 [42613]: https://github.com/rust-lang/rust/pull/42613
5539 [42799]: https://github.com/rust-lang/rust/pull/42799
5540 [42807]: https://github.com/rust-lang/rust/pull/42807
5541 [42809]: https://github.com/rust-lang/rust/pull/42809
5542 [42822]: https://github.com/rust-lang/rust/pull/42822
5543 [42826]: https://github.com/rust-lang/rust/pull/42826
5544 [42854]: https://github.com/rust-lang/rust/pull/42854
5545 [42913]: https://github.com/rust-lang/rust/pull/42913
5546 [42999]: https://github.com/rust-lang/rust/pull/42999
5547 [43011]: https://github.com/rust-lang/rust/pull/43011
5548 [43015]: https://github.com/rust-lang/rust/pull/43015
5549 [43072]: https://github.com/rust-lang/rust/pull/43072
5550 [43077]: https://github.com/rust-lang/rust/pull/43077
5551 [43097]: https://github.com/rust-lang/rust/pull/43097
5552 [43099]: https://github.com/rust-lang/rust/pull/43099
5553 [43170]: https://github.com/rust-lang/rust/pull/43170
5554 [43178]: https://github.com/rust-lang/rust/pull/43178
5555 [43185]: https://github.com/rust-lang/rust/pull/43185
5556 [43228]: https://github.com/rust-lang/rust/pull/43228
5557 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5558 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5559 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5560 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5561 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5562 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5563 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5564 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5565 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5566 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5567 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5568 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5569 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5570 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5571 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5572 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5573 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5574 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5575 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5576 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5577 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5578 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5579 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5580 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5581 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5582 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5583 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5584 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5585 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5586 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5587 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5588 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5589 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5590 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5591 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5592 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5593 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5594 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5595 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5598 Version 1.19.0 (2017-07-20)
5599 ===========================
5604 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5605 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5606 - [Macro recursion limit increased to 1024 from 64.][41676]
5607 - [Added lint for detecting unused macros.][41907]
5608 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5609 For example: `let x = loop { break 7; };`
5610 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5611 contain `Copy` types and cannot have a `Drop` implementation.
5612 Example: `union Foo { bar: u8, baz: usize }`
5613 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5614 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5619 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5620 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5621 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5622 you should use `--target armv7-linux-androideabi`.
5623 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5624 - [Minor optimisation of string operations.][42037]
5625 - [Compiler error message is now `aborting due to previous error(s)` instead of
5626 `aborting due to N previous errors`][42150] This was previously inaccurate and
5627 would only count certain kinds of errors.
5628 - [The compiler now supports Visual Studio 2017][42225]
5629 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5630 - [Added a lot][42264] of [new error codes][42302]
5631 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5632 libraries with C Run-time Libraries(CRT) to be statically linked.
5633 - [Fixed various ARM codegen bugs][42740]
5638 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5639 `Extend<Cow<'a, str>>`][41449]
5640 - [`Vec` now implements `From<&mut [T]>`][41530]
5641 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5642 - [`SplitWhitespace` now implements `Clone`][41659]
5643 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5645 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5646 macros, but for printing to stderr.
5651 - [`OsString::shrink_to_fit`]
5654 - [`thread::ThreadId`]
5659 - [Build scripts can now add environment variables to the environment
5660 the crate is being compiled in.
5661 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5662 - [Subcommands now replace the current process rather than spawning a new
5663 child process][cargo/3970]
5664 - [Workspace members can now accept glob file patterns][cargo/3979]
5665 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5666 the members in a given workspace.][cargo/3988]
5667 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5668 - [Target directory path is now in the cargo metadata][cargo/4022]
5669 - [Cargo no longer checks out a local working directory for the
5670 crates.io index][cargo/4026] This should provide smaller file size for the
5671 registry, and improve cloning times, especially on Windows machines.
5672 - [Added an `--exclude` option for excluding certain packages when using the
5673 `--all` option][cargo/4031]
5674 - [Cargo will now automatically retry when receiving a 5xx error
5675 from crates.io][cargo/4032]
5676 - [The `--features` option now accepts multiple comma or space
5677 delimited values.][cargo/4084]
5678 - [Added support for custom target specific runners][cargo/3954]
5683 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5685 - [Rust will now release XZ compressed packages][rust-installer/57]
5686 - [rustup will now prefer to download rust packages with
5687 XZ compression][rustup/1100] over GZip packages.
5688 - [Added the ability to escape `#` in rust documentation][41785] By adding
5689 additional `#`'s ie. `##` is now `#`
5694 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5695 - [`-Z` flags are now no longer allowed to be used on the stable
5696 compiler.][41751] This has been a warning for a year previous to this.
5697 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5698 longer works][42844]. Users should migrate to the built-in `check`
5699 command, which has been available since 1.16.
5700 - [Ending a float literal with `._` is now a hard error.
5701 Example: `42._` .][41946]
5702 - [Any use of a private `extern crate` outside of its module is now a
5703 hard error.][36886] This was previously a warning.
5704 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5705 relative while the `::` prefix makes a path absolute, but was ignored and the
5706 path was relative regardless.
5707 - [Floating point constants in match patterns is now a hard error][36890]
5708 This was previously a warning.
5709 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5710 match patterns is now a hard error][36891] This was previously a warning.
5711 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5713 - [From the pound escape, lines consisting of multiple `#`s are
5715 - [It is an error to re-export private enum variants][42460]. This is
5716 known to break a number of crates that depend on an older version of
5718 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5719 to use it to find the linker, and the build will fail where it did
5720 not previously][42607]
5722 [36886]: https://github.com/rust-lang/rust/issues/36886
5723 [36888]: https://github.com/rust-lang/rust/issues/36888
5724 [36890]: https://github.com/rust-lang/rust/issues/36890
5725 [36891]: https://github.com/rust-lang/rust/issues/36891
5726 [36892]: https://github.com/rust-lang/rust/issues/36892
5727 [37406]: https://github.com/rust-lang/rust/issues/37406
5728 [39983]: https://github.com/rust-lang/rust/pull/39983
5729 [41145]: https://github.com/rust-lang/rust/pull/41145
5730 [41192]: https://github.com/rust-lang/rust/pull/41192
5731 [41258]: https://github.com/rust-lang/rust/pull/41258
5732 [41370]: https://github.com/rust-lang/rust/pull/41370
5733 [41449]: https://github.com/rust-lang/rust/pull/41449
5734 [41530]: https://github.com/rust-lang/rust/pull/41530
5735 [41624]: https://github.com/rust-lang/rust/pull/41624
5736 [41656]: https://github.com/rust-lang/rust/pull/41656
5737 [41659]: https://github.com/rust-lang/rust/pull/41659
5738 [41676]: https://github.com/rust-lang/rust/pull/41676
5739 [41751]: https://github.com/rust-lang/rust/pull/41751
5740 [41764]: https://github.com/rust-lang/rust/pull/41764
5741 [41785]: https://github.com/rust-lang/rust/pull/41785
5742 [41873]: https://github.com/rust-lang/rust/pull/41873
5743 [41907]: https://github.com/rust-lang/rust/pull/41907
5744 [41946]: https://github.com/rust-lang/rust/pull/41946
5745 [42016]: https://github.com/rust-lang/rust/pull/42016
5746 [42037]: https://github.com/rust-lang/rust/pull/42037
5747 [42068]: https://github.com/rust-lang/rust/pull/42068
5748 [42150]: https://github.com/rust-lang/rust/pull/42150
5749 [42162]: https://github.com/rust-lang/rust/pull/42162
5750 [42225]: https://github.com/rust-lang/rust/pull/42225
5751 [42264]: https://github.com/rust-lang/rust/pull/42264
5752 [42302]: https://github.com/rust-lang/rust/pull/42302
5753 [42460]: https://github.com/rust-lang/rust/issues/42460
5754 [42607]: https://github.com/rust-lang/rust/issues/42607
5755 [42740]: https://github.com/rust-lang/rust/pull/42740
5756 [42844]: https://github.com/rust-lang/rust/issues/42844
5757 [42948]: https://github.com/rust-lang/rust/pull/42948
5758 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5759 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5760 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5761 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5762 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5763 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5764 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5765 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5766 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5767 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5768 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5769 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5770 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5771 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5772 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5773 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5774 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5775 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5776 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5777 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5778 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5779 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5782 Version 1.18.0 (2017-06-08)
5783 ===========================
5788 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5789 make the item visible to just that module tree. Also accepts the keyword
5790 `crate` to make something public to the whole crate but not users of the
5791 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5792 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5793 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5794 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5795 types like `Write + Send`, trailing `+` are now supported in trait objects,
5796 and better error reporting for trait objects starting with `?Sized`.
5797 - [0e+10 is now a valid floating point literal][40589]
5798 - [Now warns if you bind a lifetime parameter to 'static][40734]
5799 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5800 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5801 representation in some cases.][40377]
5806 - [rustc can now emit mir with `--emit mir`][39891]
5807 - [Improved LLVM IR for trivial functions][40367]
5808 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5809 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5810 opportunities found through profiling
5811 - [Improved backtrace formatting when panicking][38165]
5816 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5817 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5818 iteration or reallocation.
5819 - [Simplified HashMap Bucket interface][40561] provides performance
5820 improvements for iterating and cloning.
5821 - [Specialize Vec::from_elem to use calloc][40409]
5822 - [Fixed Race condition in fs::create_dir_all][39799]
5823 - [No longer caching stdio on Windows][40516]
5824 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5825 2.50%~ faster and in one case now 12.50% faster.
5826 - [Optimized `AtomicBool::fetch_nand`][41143]
5831 - [`Child::try_wait`]
5832 - [`HashMap::retain`]
5833 - [`HashSet::retain`]
5835 - [`TcpStream::peek`]
5836 - [`UdpSocket::peek`]
5837 - [`UdpSocket::peek_from`]
5842 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5843 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5844 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5845 - [Added Android build support][cargo/3885]
5846 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5847 of a certain type, for example `cargo build --bins` will build all
5849 - [Added support for haiku][cargo/3952]
5854 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5855 - [Added rust-windbg script for better debugging on Windows][39983]
5856 - [Rust now uses the official cross compiler for NetBSD][40612]
5857 - [rustdoc now accepts `#` at the start of files][40828]
5858 - [Fixed jemalloc support for musl][41168]
5863 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5864 always placed after the sign if it exists and before the digits. With the `#`
5865 flag the zeroes are placed after the prefix and before the digits.
5866 - [Due to the struct field optimisation][40377], using `transmute` on structs
5867 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5868 always been undefined behavior, but is now more likely to break in practice.
5869 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5870 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5871 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5872 - [Overlapping inherent `impl`s are now a hard error][40728]
5873 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5874 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5875 `out.asm` and `out.ll` instead of only one of the filetypes.
5876 - [ calling a function that returns `Self` will no longer work][41805] when
5877 the size of `Self` cannot be statically determined.
5878 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5879 this has caused a few regressions namely:
5881 - Changed the link order of local static/dynamic libraries (respecting the
5882 order on given rather than having the compiler reorder).
5883 - Changed how MinGW is linked, native code linked to dynamic libraries
5884 may require manually linking to the gcc support library (for the native
5887 [38165]: https://github.com/rust-lang/rust/pull/38165
5888 [39799]: https://github.com/rust-lang/rust/pull/39799
5889 [39891]: https://github.com/rust-lang/rust/pull/39891
5890 [39983]: https://github.com/rust-lang/rust/pull/39983
5891 [40043]: https://github.com/rust-lang/rust/pull/40043
5892 [40241]: https://github.com/rust-lang/rust/pull/40241
5893 [40338]: https://github.com/rust-lang/rust/pull/40338
5894 [40367]: https://github.com/rust-lang/rust/pull/40367
5895 [40377]: https://github.com/rust-lang/rust/pull/40377
5896 [40409]: https://github.com/rust-lang/rust/pull/40409
5897 [40516]: https://github.com/rust-lang/rust/pull/40516
5898 [40556]: https://github.com/rust-lang/rust/pull/40556
5899 [40561]: https://github.com/rust-lang/rust/pull/40561
5900 [40589]: https://github.com/rust-lang/rust/pull/40589
5901 [40612]: https://github.com/rust-lang/rust/pull/40612
5902 [40723]: https://github.com/rust-lang/rust/pull/40723
5903 [40728]: https://github.com/rust-lang/rust/pull/40728
5904 [40731]: https://github.com/rust-lang/rust/pull/40731
5905 [40734]: https://github.com/rust-lang/rust/pull/40734
5906 [40805]: https://github.com/rust-lang/rust/pull/40805
5907 [40807]: https://github.com/rust-lang/rust/pull/40807
5908 [40828]: https://github.com/rust-lang/rust/pull/40828
5909 [40870]: https://github.com/rust-lang/rust/pull/40870
5910 [41085]: https://github.com/rust-lang/rust/pull/41085
5911 [41143]: https://github.com/rust-lang/rust/pull/41143
5912 [41168]: https://github.com/rust-lang/rust/pull/41168
5913 [41270]: https://github.com/rust-lang/rust/issues/41270
5914 [41469]: https://github.com/rust-lang/rust/pull/41469
5915 [41805]: https://github.com/rust-lang/rust/issues/41805
5916 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5917 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5918 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5919 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5920 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5921 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5922 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5923 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5924 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5925 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5926 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5927 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5928 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5929 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5932 Version 1.17.0 (2017-04-27)
5933 ===========================
5938 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5939 * [Fields of structs may be initialized without duplicating the field/variable
5940 names][39761]. [RFC 1682]
5941 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5942 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5943 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5944 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5945 `'b`. Soundness fix.
5946 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5947 * [Static variables may contain references to other statics][40027]
5952 * [Exit quickly on only `--emit dep-info`][40336]
5953 * [Make `-C relocation-model` more correctly determine whether the linker
5954 creates a position-independent executable][40245]
5955 * [Add `-C overflow-checks` to directly control whether integer overflow
5957 * [The rustc type checker now checks items on demand instead of in a single
5958 in-order pass][40008]. This is mostly an internal refactoring in support of
5959 future work, including incremental type checking, but also resolves [RFC
5960 1647], allowing `Self` to appear in `impl` `where` clauses.
5961 * [Optimize vtable loads][39995]
5962 * [Turn off vectorization for Emscripten targets][39990]
5963 * [Provide suggestions for unknown macros imported with `use`][39953]
5964 * [Fix ICEs in path resolution][39939]
5965 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5966 * [Add clearer error message using `&str + &str`][39116]
5977 * [`Ordering::then`]
5978 * [`Ordering::then_with`]
5979 * [`BTreeMap::range`]
5980 * [`BTreeMap::range_mut`]
5981 * [`collections::Bound`]
5982 * [`process::abort`]
5983 * [`ptr::read_unaligned`]
5984 * [`ptr::write_unaligned`]
5985 * [`Result::expect_err`]
5988 * [`Cell::into_inner`]
5994 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5995 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5996 * [`String` implements `FromIterator<&char>`][40028]
5997 * `Box` [implements][40009] a number of new conversions:
5998 `From<Box<str>> for String`,
5999 `From<Box<[T]>> for Vec<T>`,
6000 `From<Box<CStr>> for CString`,
6001 `From<Box<OsStr>> for OsString`,
6002 `From<Box<Path>> for PathBuf`,
6003 `Into<Box<str>> for String`,
6004 `Into<Box<[T]>> for Vec<T>`,
6005 `Into<Box<CStr>> for CString`,
6006 `Into<Box<OsStr>> for OsString`,
6007 `Into<Box<Path>> for PathBuf`,
6008 `Default for Box<str>`,
6009 `Default for Box<CStr>`,
6010 `Default for Box<OsStr>`,
6011 `From<&CStr> for Box<CStr>`,
6012 `From<&OsStr> for Box<OsStr>`,
6013 `From<&Path> for Box<Path>`
6014 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6015 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6016 * [Slightly optimize `slice::sort`][39538]
6017 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6018 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6019 `Box<str>` implements `From<&str>`][39438]
6020 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6021 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6022 * [`format!` estimates the needed capacity before writing a string][39356]
6023 * [Support unprivileged symlink creation in Windows][38921]
6024 * [`PathBuf` implements `Default`][38764]
6025 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6026 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6027 and poor hash functions.
6032 * [Add `cargo check --all`][cargo/3731]
6033 * [Add an option to ignore SSL revocation checking][cargo/3699]
6034 * [Add `cargo run --package`][cargo/3691]
6035 * [Add `required_features`][cargo/3667]
6036 * [Assume `build.rs` is a build script][cargo/3664]
6037 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6042 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6044 * [The "Unstable Book" documents nightly-only features][ubook]
6045 * [Improve the style of the sidebar in rustdoc output][40265]
6046 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6047 * [Fix MSP430 breakage due to `i128`][40257]
6048 * [Preliminary Solaris/SPARCv9 support][39903]
6049 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6050 run without installing the MSVC runtime.
6051 * [`rustdoc --test` includes file names in test names][39788]
6052 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6053 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6054 * [Initial support for `aarch64-unknown-freebsd`][39491]
6055 * [Initial support for `i686-unknown-netbsd`][39426]
6056 * [This release no longer includes the old makefile build system][39431]. Rust
6057 is built with a custom build system, written in Rust, and with Cargo.
6058 * [Add Debug implementations for libcollection structs][39002]
6059 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6060 * [`--test-threads=0` produces an error][38945]
6061 * [`rustup` installs documentation by default][40526]
6062 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6063 WinDbg and Visual Studio to improve the debugging experience.
6068 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6069 workaround, either use MSVC 2015 or run vcvars.bat.
6070 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6071 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6072 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6074 * [`format!` and `Display::to_string` panic if an underlying formatting
6075 implementation returns an error][40117]. Previously the error was silently
6076 ignored. It is incorrect for `write_fmt` to return an error when writing
6078 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6079 crates were marked stable and could be accessed from the stable toolchain.
6080 * [Rust git source no longer includes vendored crates][39728]. Those that need
6081 to build with vendored crates should build from release tarballs.
6082 * [Fix inert attributes from `proc_macro_derives`][39572]
6083 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6084 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6086 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6087 existing code generally ignores the type of dead-code unless a type-hint is
6088 provided; this can cause surprising inference interactions particularly around
6089 defaulting. The new code uniformly ignores the result type of dead-code.
6090 * [Tuple-struct constructors with private fields are no longer visible][38932]
6091 * [Lifetime parameters that do not appear in the arguments are now considered
6092 early-bound][38897], resolving a soundness bug (#[32330]). The
6093 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6095 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6096 * [Make transmuting from fn item types to pointer-sized types a hard
6099 [27787]: https://github.com/rust-lang/rust/issues/27787
6100 [32330]: https://github.com/rust-lang/rust/issues/32330
6101 [34198]: https://github.com/rust-lang/rust/pull/34198
6102 [38161]: https://github.com/rust-lang/rust/pull/38161
6103 [38368]: https://github.com/rust-lang/rust/pull/38368
6104 [38584]: https://github.com/rust-lang/rust/issues/38584
6105 [38661]: https://github.com/rust-lang/rust/pull/38661
6106 [38764]: https://github.com/rust-lang/rust/pull/38764
6107 [38864]: https://github.com/rust-lang/rust/issues/38864
6108 [38897]: https://github.com/rust-lang/rust/pull/38897
6109 [38921]: https://github.com/rust-lang/rust/pull/38921
6110 [38932]: https://github.com/rust-lang/rust/pull/38932
6111 [38945]: https://github.com/rust-lang/rust/pull/38945
6112 [38981]: https://github.com/rust-lang/rust/pull/38981
6113 [39002]: https://github.com/rust-lang/rust/pull/39002
6114 [39116]: https://github.com/rust-lang/rust/pull/39116
6115 [39193]: https://github.com/rust-lang/rust/pull/39193
6116 [39265]: https://github.com/rust-lang/rust/pull/39265
6117 [39356]: https://github.com/rust-lang/rust/pull/39356
6118 [39372]: https://github.com/rust-lang/rust/pull/39372
6119 [39426]: https://github.com/rust-lang/rust/pull/39426
6120 [39431]: https://github.com/rust-lang/rust/pull/39431
6121 [39438]: https://github.com/rust-lang/rust/pull/39438
6122 [39440]: https://github.com/rust-lang/rust/pull/39440
6123 [39485]: https://github.com/rust-lang/rust/pull/39485
6124 [39491]: https://github.com/rust-lang/rust/pull/39491
6125 [39518]: https://github.com/rust-lang/rust/pull/39518
6126 [39538]: https://github.com/rust-lang/rust/pull/39538
6127 [39572]: https://github.com/rust-lang/rust/pull/39572
6128 [39633]: https://github.com/rust-lang/rust/pull/39633
6129 [39642]: https://github.com/rust-lang/rust/pull/39642
6130 [39728]: https://github.com/rust-lang/rust/pull/39728
6131 [39761]: https://github.com/rust-lang/rust/pull/39761
6132 [39788]: https://github.com/rust-lang/rust/pull/39788
6133 [39793]: https://github.com/rust-lang/rust/pull/39793
6134 [39837]: https://github.com/rust-lang/rust/pull/39837
6135 [39843]: https://github.com/rust-lang/rust/pull/39843
6136 [39851]: https://github.com/rust-lang/rust/pull/39851
6137 [39903]: https://github.com/rust-lang/rust/pull/39903
6138 [39939]: https://github.com/rust-lang/rust/pull/39939
6139 [39953]: https://github.com/rust-lang/rust/pull/39953
6140 [39960]: https://github.com/rust-lang/rust/pull/39960
6141 [39990]: https://github.com/rust-lang/rust/pull/39990
6142 [39995]: https://github.com/rust-lang/rust/pull/39995
6143 [40008]: https://github.com/rust-lang/rust/pull/40008
6144 [40009]: https://github.com/rust-lang/rust/pull/40009
6145 [40027]: https://github.com/rust-lang/rust/pull/40027
6146 [40028]: https://github.com/rust-lang/rust/pull/40028
6147 [40037]: https://github.com/rust-lang/rust/pull/40037
6148 [40117]: https://github.com/rust-lang/rust/pull/40117
6149 [40166]: https://github.com/rust-lang/rust/pull/40166
6150 [40245]: https://github.com/rust-lang/rust/pull/40245
6151 [40257]: https://github.com/rust-lang/rust/pull/40257
6152 [40261]: https://github.com/rust-lang/rust/pull/40261
6153 [40265]: https://github.com/rust-lang/rust/pull/40265
6154 [40319]: https://github.com/rust-lang/rust/pull/40319
6155 [40336]: https://github.com/rust-lang/rust/pull/40336
6156 [40526]: https://github.com/rust-lang/rust/pull/40526
6157 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6158 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6159 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6160 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6161 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6162 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6163 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6164 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6165 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6166 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6167 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6168 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6169 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6170 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6171 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6172 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6173 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6174 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6175 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6176 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6177 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6178 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6179 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6180 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6181 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6182 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6183 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6184 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6185 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6186 [mdbook]: https://crates.io/crates/mdbook
6187 [ubook]: https://doc.rust-lang.org/unstable-book/
6190 Version 1.16.0 (2017-03-16)
6191 ===========================
6196 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6197 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6198 match patterns][38069]
6199 * [Clean up semantics of `self` in an import list][38313]
6200 * [`Self` may appear in `impl` headers][38920]
6201 * [`Self` may appear in struct expressions][39282]
6206 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6207 a `.rmeta` file containing only crate metadata][38571]. This can be
6208 used by tools like the Rust Language Service to perform
6209 metadata-only builds.
6210 * [Levenshtein based typo suggestions now work in most places, while
6211 previously they worked only for fields and sometimes for local
6212 variables][38927]. Together with the overhaul of "no
6213 resolution"/"unexpected resolution" errors (#[38154]) they result in
6214 large and systematic improvement in resolution diagnostics.
6215 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6217 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6218 * [`rustc` no longer attempts to provide "consider using an explicit
6219 lifetime" suggestions][37057]. They were inaccurate.
6224 * [`VecDeque::truncate`]
6225 * [`VecDeque::resize`]
6226 * [`String::insert_str`]
6227 * [`Duration::checked_add`]
6228 * [`Duration::checked_sub`]
6229 * [`Duration::checked_div`]
6230 * [`Duration::checked_mul`]
6233 * [`SocketAddr::is_ipv4`]
6234 * [`SocketAddr::is_ipv6`]
6235 * [`IpAddr::is_ipv4`]
6236 * [`IpAddr::is_ipv6`]
6238 * [`Vec::dedup_by_key`]
6239 * [`Result::unwrap_or_default`]
6240 * [`<*const T>::wrapping_offset`]
6241 * [`<*mut T>::wrapping_offset`]
6242 * `CommandExt::creation_flags`
6243 * [`File::set_permissions`]
6244 * [`String::split_off`]
6249 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6250 their argument by `Borrow` parameter][37761]
6251 * [All public types in std implement `Debug`][38006]
6252 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6253 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6254 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6256 * [std: Fix partial writes in `LineWriter`][38062]
6257 * [std: Clamp max read/write sizes on Unix][38062]
6258 * [Use more specific panic message for `&str` slicing errors][38066]
6259 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6260 functionality cannot be achieved in std currently.
6261 * [`writeln!`, like `println!`, now accepts a form with no string
6262 or formatting arguments, to just print a newline][38469]
6263 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6264 * [Reduce the size of static data in `std_unicode::tables`][38781]
6265 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6266 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6268 * [`Duration` implements `Sum`][38712]
6269 * [`String` implements `ToSocketAddrs`][39048]
6274 * [The `cargo check` command does a type check of a project without
6275 building it][cargo/3296]
6276 * [crates.io will display CI badges from Travis and AppVeyor, if
6277 specified in Cargo.toml][cargo/3546]
6278 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6279 * [Compilation profiles accept integer values for `debug`, in addition
6280 to `true` and `false`. These are passed to `rustc` as the value to
6281 `-C debuginfo`][cargo/3534]
6282 * [Implement `cargo --version --verbose`][cargo/3604]
6283 * [All builds now output 'dep-info' build dependencies compatible with
6284 make and ninja][cargo/3557]
6285 * [Build all workspace members with `build --all`][cargo/3511]
6286 * [Document all workspace members with `doc --all`][cargo/3515]
6287 * [Path deps outside workspace are not members][cargo/3443]
6292 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6293 the path to the Rust implementation][38589]
6294 * [The `armv7-linux-androideabi` target no longer enables NEON
6295 extensions, per Google's ABI guide][38413]
6296 * [The stock standard library can be compiled for Redox OS][38401]
6297 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6299 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6301 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6306 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6307 match patterns][38069]
6308 * In this release, references to uninhabited types can not be
6309 pattern-matched. This was accidentally allowed in 1.15.
6310 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6311 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6313 * [Clean up semantics of `self` in an import list][38313]
6314 * Reimplemented lifetime elision. This change was almost entirely compatible
6315 with existing code, but it did close a number of small bugs and loopholes,
6316 as well as being more accepting in some other [cases][41105].
6318 [37057]: https://github.com/rust-lang/rust/pull/37057
6319 [37761]: https://github.com/rust-lang/rust/pull/37761
6320 [38006]: https://github.com/rust-lang/rust/pull/38006
6321 [38051]: https://github.com/rust-lang/rust/pull/38051
6322 [38062]: https://github.com/rust-lang/rust/pull/38062
6323 [38062]: https://github.com/rust-lang/rust/pull/38622
6324 [38066]: https://github.com/rust-lang/rust/pull/38066
6325 [38069]: https://github.com/rust-lang/rust/pull/38069
6326 [38131]: https://github.com/rust-lang/rust/pull/38131
6327 [38154]: https://github.com/rust-lang/rust/pull/38154
6328 [38274]: https://github.com/rust-lang/rust/pull/38274
6329 [38304]: https://github.com/rust-lang/rust/pull/38304
6330 [38313]: https://github.com/rust-lang/rust/pull/38313
6331 [38314]: https://github.com/rust-lang/rust/pull/38314
6332 [38327]: https://github.com/rust-lang/rust/pull/38327
6333 [38401]: https://github.com/rust-lang/rust/pull/38401
6334 [38413]: https://github.com/rust-lang/rust/pull/38413
6335 [38469]: https://github.com/rust-lang/rust/pull/38469
6336 [38559]: https://github.com/rust-lang/rust/pull/38559
6337 [38571]: https://github.com/rust-lang/rust/pull/38571
6338 [38580]: https://github.com/rust-lang/rust/pull/38580
6339 [38589]: https://github.com/rust-lang/rust/pull/38589
6340 [38670]: https://github.com/rust-lang/rust/pull/38670
6341 [38712]: https://github.com/rust-lang/rust/pull/38712
6342 [38726]: https://github.com/rust-lang/rust/pull/38726
6343 [38781]: https://github.com/rust-lang/rust/pull/38781
6344 [38798]: https://github.com/rust-lang/rust/pull/38798
6345 [38909]: https://github.com/rust-lang/rust/pull/38909
6346 [38920]: https://github.com/rust-lang/rust/pull/38920
6347 [38927]: https://github.com/rust-lang/rust/pull/38927
6348 [39048]: https://github.com/rust-lang/rust/pull/39048
6349 [39282]: https://github.com/rust-lang/rust/pull/39282
6350 [39379]: https://github.com/rust-lang/rust/pull/39379
6351 [41105]: https://github.com/rust-lang/rust/issues/41105
6352 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6353 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6354 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6355 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6356 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6357 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6358 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6359 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6360 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6361 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6362 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6363 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6364 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6365 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6366 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6367 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6368 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6369 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6370 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6371 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6372 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6373 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6374 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6375 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6376 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6377 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6378 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6379 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6380 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6381 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6384 Version 1.15.1 (2017-02-09)
6385 ===========================
6387 * [Fix IntoIter::as_mut_slice's signature][39466]
6388 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6390 [39466]: https://github.com/rust-lang/rust/pull/39466
6391 [39523]: https://github.com/rust-lang/rust/pull/39523
6394 Version 1.15.0 (2017-02-02)
6395 ===========================
6400 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6401 stable. This allows popular code-generating crates like Serde and Diesel to
6402 work ergonomically. [RFC 1681].
6403 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6404 with curly braces][36868]. Part of [RFC 1506].
6405 * [A number of minor changes to name resolution have been activated][37127].
6406 They add up to more consistent semantics, allowing for future evolution of
6407 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6408 details of what is different. The breaking changes here have been transitioned
6409 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6410 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6412 * [`?Sized` can be used in `where` clauses][37791]
6413 * [There is now a limit on the size of monomorphized types and it can be
6414 modified with the `#![type_size_limit]` crate attribute, similarly to
6415 the `#![recursion_limit]` attribute][37789]
6420 * [On Windows, the compiler will apply dllimport attributes when linking to
6421 extern functions][37973]. Additional attributes and flags can control which
6422 library kind is linked and its name. [RFC 1717].
6423 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6424 * [The `--test` flag works with procedural macro crates][38107]
6425 * [Fix `extern "aapcs" fn` ABI][37814]
6426 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6427 * [The `format!` expander recognizes incorrect `printf` and shell-style
6428 formatting directives and suggests the correct format][37613].
6429 * [Only report one error for all unused imports in an import list][37456]
6431 Compiler Performance
6432 --------------------
6434 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6435 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6436 * [Don't clone in `UnificationTable::probe`][37848]
6437 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6438 * [Use small vectors in type walker][37760]
6439 * [Macro expansion performance was improved][37701]
6440 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6441 * [Replace FNV with a faster hash function][37229]
6446 * [`std::iter::Iterator::min_by`]
6447 * [`std::iter::Iterator::max_by`]
6448 * [`std::os::*::fs::FileExt`]
6449 * [`std::sync::atomic::Atomic*::get_mut`]
6450 * [`std::sync::atomic::Atomic*::into_inner`]
6451 * [`std::vec::IntoIter::as_slice`]
6452 * [`std::vec::IntoIter::as_mut_slice`]
6453 * [`std::sync::mpsc::Receiver::try_iter`]
6454 * [`std::os::unix::process::CommandExt::before_exec`]
6455 * [`std::rc::Rc::strong_count`]
6456 * [`std::rc::Rc::weak_count`]
6457 * [`std::sync::Arc::strong_count`]
6458 * [`std::sync::Arc::weak_count`]
6459 * [`std::char::encode_utf8`]
6460 * [`std::char::encode_utf16`]
6461 * [`std::cell::Ref::clone`]
6462 * [`std::io::Take::into_inner`]
6467 * [The standard sorting algorithm has been rewritten for dramatic performance
6468 improvements][38192]. It is a hybrid merge sort, drawing influences from
6469 Timsort. Previously it was a naive merge sort.
6470 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6471 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6473 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6474 and `char_indices().last()`][37882]
6475 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6476 * [Chinese characters display correctly in `fmt::Debug`][37855]
6477 * [Derive `Default` for `Duration`][37699]
6478 * [Support creation of anonymous pipes on WinXP/2k][37677]
6479 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6480 * [Don't pass overlapped handles to processes][38835]
6485 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6486 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6487 should instead check the variable at runtime with `std::env`. That the value
6488 was set at build time was a bug, and incorrect when cross-compiling. This
6489 change is known to cause breakage.
6490 * [Add `--all` flag to `cargo test`][cargo/3221]
6491 * [Compile statically against the MSVC CRT][cargo/3363]
6492 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6493 * [Link OpenSSL statically on OSX][cargo/3311]
6494 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6495 * [Test for bad path overrides with summaries][cargo/3336]
6496 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6497 * [Fix retrying crate downloads for network errors][cargo/3348]
6498 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6499 * [Emit more info on --message-format=json][cargo/3319]
6500 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6501 * [Don't ignore errors in workspace manifest][cargo/3409]
6502 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6507 * [Test runners (binaries built with `--test`) now support a `--list` argument
6508 that lists the tests it contains][38185]
6509 * [Test runners now support a `--exact` argument that makes the test filter
6510 match exactly, instead of matching only a substring of the test name][38181]
6511 * [rustdoc supports a `--playground-url` flag][37763]
6512 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6517 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6518 continue to be used in this release by passing `--disable-rustbuild` to the
6519 configure script, but they will be deleted soon. Note that the new build
6520 system uses a different on-disk layout that will likely affect any scripts
6522 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6524 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6525 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6531 * [A number of minor changes to name resolution have been activated][37127].
6532 They add up to more consistent semantics, allowing for future evolution of
6533 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6534 details of what is different. The breaking changes here have been transitioned
6535 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6536 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6537 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6538 should instead check the variable at runtime with `std::env`. That the value
6539 was set at build time was a bug, and incorrect when cross-compiling. This
6540 change is known to cause breakage.
6541 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6542 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6543 1.10 and is now an error by default. It will become a hard error in the near
6545 * [The semantics relating modules to file system directories are changing in
6546 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6547 lint, which is a warning in this release, and will become a hard error in the
6549 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6550 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6551 the underlying iterator][37834]
6553 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6554 [33685]: https://github.com/rust-lang/rust/issues/33685
6555 [36868]: https://github.com/rust-lang/rust/pull/36868
6556 [37127]: https://github.com/rust-lang/rust/pull/37127
6557 [37229]: https://github.com/rust-lang/rust/pull/37229
6558 [37456]: https://github.com/rust-lang/rust/pull/37456
6559 [37527]: https://github.com/rust-lang/rust/pull/37527
6560 [37602]: https://github.com/rust-lang/rust/pull/37602
6561 [37613]: https://github.com/rust-lang/rust/pull/37613
6562 [37615]: https://github.com/rust-lang/rust/pull/37615
6563 [37636]: https://github.com/rust-lang/rust/pull/37636
6564 [37627]: https://github.com/rust-lang/rust/pull/37627
6565 [37642]: https://github.com/rust-lang/rust/pull/37642
6566 [37677]: https://github.com/rust-lang/rust/pull/37677
6567 [37699]: https://github.com/rust-lang/rust/pull/37699
6568 [37701]: https://github.com/rust-lang/rust/pull/37701
6569 [37705]: https://github.com/rust-lang/rust/pull/37705
6570 [37749]: https://github.com/rust-lang/rust/pull/37749
6571 [37760]: https://github.com/rust-lang/rust/pull/37760
6572 [37763]: https://github.com/rust-lang/rust/pull/37763
6573 [37764]: https://github.com/rust-lang/rust/pull/37764
6574 [37789]: https://github.com/rust-lang/rust/pull/37789
6575 [37791]: https://github.com/rust-lang/rust/pull/37791
6576 [37814]: https://github.com/rust-lang/rust/pull/37814
6577 [37817]: https://github.com/rust-lang/rust/pull/37817
6578 [37834]: https://github.com/rust-lang/rust/pull/37834
6579 [37848]: https://github.com/rust-lang/rust/pull/37848
6580 [37855]: https://github.com/rust-lang/rust/pull/37855
6581 [37882]: https://github.com/rust-lang/rust/pull/37882
6582 [37888]: https://github.com/rust-lang/rust/pull/37888
6583 [37973]: https://github.com/rust-lang/rust/pull/37973
6584 [37979]: https://github.com/rust-lang/rust/pull/37979
6585 [38086]: https://github.com/rust-lang/rust/pull/38086
6586 [38107]: https://github.com/rust-lang/rust/pull/38107
6587 [38117]: https://github.com/rust-lang/rust/pull/38117
6588 [38134]: https://github.com/rust-lang/rust/pull/38134
6589 [38146]: https://github.com/rust-lang/rust/pull/38146
6590 [38181]: https://github.com/rust-lang/rust/pull/38181
6591 [38182]: https://github.com/rust-lang/rust/pull/38182
6592 [38185]: https://github.com/rust-lang/rust/pull/38185
6593 [38192]: https://github.com/rust-lang/rust/pull/38192
6594 [38279]: https://github.com/rust-lang/rust/pull/38279
6595 [38835]: https://github.com/rust-lang/rust/pull/38835
6596 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6597 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6598 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6599 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6600 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6601 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6602 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6603 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6604 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6605 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6606 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6607 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6608 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6609 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6610 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6611 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6612 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6613 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6614 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6615 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6616 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6617 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6618 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6619 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6620 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6621 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6622 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6623 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6624 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6625 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6626 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6627 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6628 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6629 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6630 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6631 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6632 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6633 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6636 Version 1.14.0 (2016-12-22)
6637 ===========================
6642 * [`..` matches multiple tuple fields in enum variants, structs
6643 and tuples][36843]. [RFC 1492].
6644 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6645 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6646 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6647 dereferencing][36822]
6652 * [Mark enums with non-zero discriminant as non-zero][37224]
6653 * [Lower-case `static mut` names are linted like other
6654 statics and consts][37162]
6655 * [Fix ICE on some macros in const integer positions
6656 (e.g. `[u8; m!()]`)][36819]
6657 * [Improve error message and snippet for "did you mean `x`"][36798]
6658 * [Add a panic-strategy field to the target specification][36794]
6659 * [Include LLVM version in `--version --verbose`][37200]
6661 Compile-time Optimizations
6662 --------------------------
6664 * [Improve macro expansion performance][37569]
6665 * [Shrink `Expr_::ExprInlineAsm`][37445]
6666 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6667 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6668 * [Avoid more allocations when compiling html5ever][37373]
6669 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6670 * [Avoid some allocations in the macro parser][37318]
6671 * [Use a faster deflate setting][37298]
6672 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6673 during interning of slices][37270]
6674 * [Optimize `write_metadata`][37267]
6675 * [Don't process obligation forest cycles when stalled][37231]
6676 * [Avoid many `CrateConfig` clones][37161]
6677 * [Optimize `Substs::super_fold_with`][37108]
6678 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6679 * [Speed up `plug_leaks`][36917]
6684 * [`println!()`, with no arguments, prints newline][36825].
6685 Previously, an empty string was required to achieve the same.
6686 * [`Wrapping` impls standard binary and unary operators, as well as
6687 the `Sum` and `Product` iterators][37356]
6688 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6690 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6691 `VecDeque` iterators][37315]
6692 * [Improve `SipHasher` performance on small values][37312]
6693 * [Add Iterator trait TrustedLen to enable better FromIterator /
6695 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6696 * [`ReadDir` implements `Debug`][37221]
6697 * [Implement `RefUnwindSafe` for atomic types][37178]
6698 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6699 * [Avoid allocations in `Decoder::read_str`][37064]
6700 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6701 * [Impl `Debug` for raw pointers to unsized data][36880]
6702 * [Don't reuse `HashMap` random seeds][37470]
6703 * [The internal memory layout of `HashMap` is more cache-friendly, for
6704 significant improvements in some operations][36692]
6705 * [`HashMap` uses less memory on 32-bit architectures][36595]
6706 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6711 * [Expose rustc cfg values to build scripts][cargo/3243]
6712 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6713 * [Fix passing --features when testing multiple packages][cargo/3280]
6714 * [Use a single profile set per workspace][cargo/3249]
6715 * [Load `replace` sections from lock files][cargo/3220]
6716 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6721 * [rustup is the recommended Rust installation method][1.14rustup]
6722 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6723 S390x. These are [tier 2] platforms and may have major defects. Follow the
6724 instructions on the website to install, or add the targets to an existing
6725 installation with `rustup target add`. The new target triples are:
6726 - `mips-unknown-linux-gnu`
6727 - `mipsel-unknown-linux-gnu`
6728 - `mips64-unknown-linux-gnuabi64`
6729 - `mips64el-unknown-linux-gnuabi64 `
6730 - `powerpc-unknown-linux-gnu`
6731 - `powerpc64-unknown-linux-gnu`
6732 - `powerpc64le-unknown-linux-gnu`
6733 - `s390x-unknown-linux-gnu `
6734 * This release includes target (std) builds for ARM Linux running MUSL
6735 libc. These are [tier 2] platforms and may have major defects. Add the
6736 following triples to an existing rustup installation with `rustup target add`:
6737 - `arm-unknown-linux-musleabi`
6738 - `arm-unknown-linux-musleabihf`
6739 - `armv7-unknown-linux-musleabihf`
6740 * This release includes [experimental support for WebAssembly][1.14wasm], via
6741 the `wasm32-unknown-emscripten` target. This target is known to have major
6742 defects. Please test, report, and fix.
6743 * rustup no longer installs documentation by default. Run `rustup
6744 component add rust-docs` to install.
6745 * [Fix line stepping in debugger][37310]
6746 * [Enable line number debuginfo in releases][37280]
6751 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6752 * [Add support for Fuchsia OS][37313]
6753 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6758 * [A number of forward-compatibility lints used by the compiler
6759 to gradually introduce language changes have been converted
6760 to deny by default][36894]:
6761 - ["use of inaccessible extern crate erroneously allowed"][36886]
6762 - ["type parameter default erroneously allowed in invalid location"][36887]
6763 - ["detects super or self keywords at the beginning of global path"][36888]
6764 - ["two overlapping inherent impls define an item with the same name
6765 were erroneously allowed"][36889]
6766 - ["floating-point constants cannot be used in patterns"][36890]
6767 - ["constants of struct or enum type can only be used in a pattern if
6768 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6769 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6770 * [Prohibit patterns in trait methods without bodies][37378]
6771 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6772 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6773 * [The `$crate` macro variable is accepted in fewer locations][37213]
6774 * [Impls specifying extra region requirements beyond the trait
6775 they implement are rejected][37167]
6776 * [Enums may not be unsized][37111]. Unsized enums are intended to
6777 work but never have. For now they are forbidden.
6778 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6780 [tier 2]: https://forge.rust-lang.org/platform-support.html
6781 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6782 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6783 [36430]: https://github.com/rust-lang/rust/pull/36430
6784 [36595]: https://github.com/rust-lang/rust/pull/36595
6785 [36595]: https://github.com/rust-lang/rust/pull/36595
6786 [36692]: https://github.com/rust-lang/rust/pull/36692
6787 [36767]: https://github.com/rust-lang/rust/pull/36767
6788 [36794]: https://github.com/rust-lang/rust/pull/36794
6789 [36798]: https://github.com/rust-lang/rust/pull/36798
6790 [36819]: https://github.com/rust-lang/rust/pull/36819
6791 [36822]: https://github.com/rust-lang/rust/pull/36822
6792 [36825]: https://github.com/rust-lang/rust/pull/36825
6793 [36843]: https://github.com/rust-lang/rust/pull/36843
6794 [36880]: https://github.com/rust-lang/rust/pull/36880
6795 [36886]: https://github.com/rust-lang/rust/issues/36886
6796 [36887]: https://github.com/rust-lang/rust/issues/36887
6797 [36888]: https://github.com/rust-lang/rust/issues/36888
6798 [36889]: https://github.com/rust-lang/rust/issues/36889
6799 [36890]: https://github.com/rust-lang/rust/issues/36890
6800 [36891]: https://github.com/rust-lang/rust/issues/36891
6801 [36892]: https://github.com/rust-lang/rust/issues/36892
6802 [36894]: https://github.com/rust-lang/rust/pull/36894
6803 [36917]: https://github.com/rust-lang/rust/pull/36917
6804 [36993]: https://github.com/rust-lang/rust/pull/36993
6805 [37037]: https://github.com/rust-lang/rust/pull/37037
6806 [37064]: https://github.com/rust-lang/rust/pull/37064
6807 [37094]: https://github.com/rust-lang/rust/pull/37094
6808 [37108]: https://github.com/rust-lang/rust/pull/37108
6809 [37111]: https://github.com/rust-lang/rust/pull/37111
6810 [37161]: https://github.com/rust-lang/rust/pull/37161
6811 [37162]: https://github.com/rust-lang/rust/pull/37162
6812 [37167]: https://github.com/rust-lang/rust/pull/37167
6813 [37178]: https://github.com/rust-lang/rust/pull/37178
6814 [37200]: https://github.com/rust-lang/rust/pull/37200
6815 [37213]: https://github.com/rust-lang/rust/pull/37213
6816 [37221]: https://github.com/rust-lang/rust/pull/37221
6817 [37224]: https://github.com/rust-lang/rust/pull/37224
6818 [37230]: https://github.com/rust-lang/rust/pull/37230
6819 [37231]: https://github.com/rust-lang/rust/pull/37231
6820 [37247]: https://github.com/rust-lang/rust/pull/37247
6821 [37267]: https://github.com/rust-lang/rust/pull/37267
6822 [37270]: https://github.com/rust-lang/rust/pull/37270
6823 [37273]: https://github.com/rust-lang/rust/pull/37273
6824 [37280]: https://github.com/rust-lang/rust/pull/37280
6825 [37298]: https://github.com/rust-lang/rust/pull/37298
6826 [37306]: https://github.com/rust-lang/rust/pull/37306
6827 [37310]: https://github.com/rust-lang/rust/pull/37310
6828 [37312]: https://github.com/rust-lang/rust/pull/37312
6829 [37313]: https://github.com/rust-lang/rust/pull/37313
6830 [37315]: https://github.com/rust-lang/rust/pull/37315
6831 [37318]: https://github.com/rust-lang/rust/pull/37318
6832 [37322]: https://github.com/rust-lang/rust/pull/37322
6833 [37326]: https://github.com/rust-lang/rust/pull/37326
6834 [37351]: https://github.com/rust-lang/rust/pull/37351
6835 [37356]: https://github.com/rust-lang/rust/pull/37356
6836 [37367]: https://github.com/rust-lang/rust/pull/37367
6837 [37373]: https://github.com/rust-lang/rust/pull/37373
6838 [37378]: https://github.com/rust-lang/rust/pull/37378
6839 [37389]: https://github.com/rust-lang/rust/pull/37389
6840 [37392]: https://github.com/rust-lang/rust/pull/37392
6841 [37427]: https://github.com/rust-lang/rust/pull/37427
6842 [37439]: https://github.com/rust-lang/rust/pull/37439
6843 [37445]: https://github.com/rust-lang/rust/pull/37445
6844 [37470]: https://github.com/rust-lang/rust/pull/37470
6845 [37569]: https://github.com/rust-lang/rust/pull/37569
6846 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6847 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6848 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6849 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6850 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6851 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6852 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6855 Version 1.13.0 (2016-11-10)
6856 ===========================
6861 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6862 errors, like the `try!` macro, described in [RFC 0243].
6863 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6864 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6865 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6866 * [Fix lifetime rules for 'if' conditions][36029]
6867 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6872 * [Add the `-C link-arg` argument][36574]
6873 * [Remove the old AST-based backend from rustc_trans][35764]
6874 * [Don't enable NEON by default on armv7 Linux][35814]
6875 * [Fix debug line number info for macro expansions][35238]
6876 * [Do not emit "class method" debuginfo for types that are not
6877 DICompositeType][36008]
6878 * [Warn about multiple conflicting #[repr] hints][34623]
6879 * [When sizing DST, don't double-count nested struct prefixes][36351]
6880 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6881 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6882 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6883 * [Expand macros without recursing to avoid stack overflows][36214]
6888 * [Replace macro backtraces with labeled local uses][35702]
6889 * [Improve error message for misplaced doc comments][33922]
6890 * [Buffer unix and lock windows to prevent message interleaving][35975]
6891 * [Update lifetime errors to specifically note temporaries][36171]
6892 * [Special case a few colors for Windows][36178]
6893 * [Suggest `use self` when such an import resolves][36289]
6894 * [Be more specific when type parameter shadows primitive type][36338]
6895 * Many minor improvements
6897 Compile-time Optimizations
6898 --------------------------
6900 * [Compute and cache HIR hashes at beginning][35854]
6901 * [Don't hash types in loan paths][36004]
6902 * [Cache projections in trans][35761]
6903 * [Optimize the parser's last token handling][36527]
6904 * [Only instantiate #[inline] functions in codegen units referencing
6905 them][36524]. This leads to big improvements in cases where crates export
6906 define many inline functions without using them directly.
6907 * [Lazily allocate TypedArena's first chunk][36592]
6908 * [Don't allocate during default HashSet creation][36734]
6915 * [`overflowing_abs`]
6916 * [`RefCell::try_borrow`]
6917 * [`RefCell::try_borrow_mut`]
6922 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6923 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6925 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6926 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6927 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6928 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6929 * [Use arc4rand on FreeBSD][35884]
6930 * [memrchr: Correct aligned offset computation][35969]
6931 * [Improve Demangling of Rust Symbols][36059]
6932 * [Use monotonic time in condition variables][35048]
6933 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6934 * [Implement conversion traits for `char`][35755]
6935 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6936 * [Zero first byte of CString on drop][36264]
6937 * [Inherit overflow checks for sum and product][36372]
6938 * [Add missing Eq implementations][36423]
6939 * [Implement `Debug` for `DirEntry`][36631]
6940 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6942 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6943 * [Implement more traits for `std::io::ErrorKind`][35911]
6944 * [Optimize BinaryHeap bounds checking][36072]
6945 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6946 `extend_with_element`][36355]
6947 * [Fix overflow checking in unsigned pow()][34942]
6952 * This release includes security fixes to both curl and OpenSSL.
6953 * [Fix transitive doctests when panic=abort][cargo/3021]
6954 * [Add --all-features flag to cargo][cargo/3038]
6955 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6956 * [Don't parse the home directory more than once][cargo/3078]
6957 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6958 * [Update OpenSSL to 1.0.2j][cargo/3121]
6959 * [Add license and license_file to cargo metadata output][cargo/3110]
6960 * [Make crates-io registry URL optional in config; ignore all changes to
6961 source.crates-io][cargo/3089]
6962 * [Don't download dependencies from other platforms][cargo/3123]
6963 * [Build transitive dev-dependencies when needed][cargo/3125]
6964 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6965 * [Avoid updating registry when adding existing deps][cargo/3144]
6966 * [Warn about path overrides that won't work][cargo/3136]
6967 * [Use workspaces during `cargo install`][cargo/3146]
6968 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6969 * [Add --message-format flag][cargo/3000]
6970 * [Pass target environment for rustdoc][cargo/3205]
6971 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6972 * [Update curl and curl-sys][cargo/3241]
6973 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6978 * [rustdoc: Add the `--sysroot` argument][36586]
6979 * [rustdoc: Fix a couple of issues with the search results][35655]
6980 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6981 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6982 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6987 * [Remove unmaintained style guide][35124]
6988 * [Add s390x support][36369]
6989 * [Initial work at Haiku OS support][36727]
6990 * [Add mips-uclibc targets][35734]
6991 * [Crate-ify compiler-rt into compiler-builtins][35021]
6992 * [Add rustc version info (git hash + date) to dist tarball][36213]
6993 * Many documentation improvements
6998 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6999 * [Deny (by default) transmuting from fn item types to pointer-sized
7000 types][34923]. Continuing the long transition to zero-sized fn items,
7002 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7004 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7005 * [Fix lifetime rules for 'if' conditions][36029].
7006 * [Inherit overflow checks for sum and product][36372].
7007 * [Forbid user-defined macros named "macro_rules"][36730].
7009 [33922]: https://github.com/rust-lang/rust/pull/33922
7010 [34623]: https://github.com/rust-lang/rust/pull/34623
7011 [34923]: https://github.com/rust-lang/rust/pull/34923
7012 [34942]: https://github.com/rust-lang/rust/pull/34942
7013 [34982]: https://github.com/rust-lang/rust/pull/34982
7014 [35021]: https://github.com/rust-lang/rust/pull/35021
7015 [35048]: https://github.com/rust-lang/rust/pull/35048
7016 [35074]: https://github.com/rust-lang/rust/pull/35074
7017 [35124]: https://github.com/rust-lang/rust/pull/35124
7018 [35234]: https://github.com/rust-lang/rust/pull/35234
7019 [35238]: https://github.com/rust-lang/rust/pull/35238
7020 [35354]: https://github.com/rust-lang/rust/pull/35354
7021 [35559]: https://github.com/rust-lang/rust/pull/35559
7022 [35585]: https://github.com/rust-lang/rust/pull/35585
7023 [35627]: https://github.com/rust-lang/rust/pull/35627
7024 [35655]: https://github.com/rust-lang/rust/pull/35655
7025 [35702]: https://github.com/rust-lang/rust/pull/35702
7026 [35707]: https://github.com/rust-lang/rust/pull/35707
7027 [35728]: https://github.com/rust-lang/rust/pull/35728
7028 [35734]: https://github.com/rust-lang/rust/pull/35734
7029 [35755]: https://github.com/rust-lang/rust/pull/35755
7030 [35761]: https://github.com/rust-lang/rust/pull/35761
7031 [35764]: https://github.com/rust-lang/rust/pull/35764
7032 [35814]: https://github.com/rust-lang/rust/pull/35814
7033 [35854]: https://github.com/rust-lang/rust/pull/35854
7034 [35871]: https://github.com/rust-lang/rust/pull/35871
7035 [35884]: https://github.com/rust-lang/rust/pull/35884
7036 [35911]: https://github.com/rust-lang/rust/pull/35911
7037 [35969]: https://github.com/rust-lang/rust/pull/35969
7038 [35975]: https://github.com/rust-lang/rust/pull/35975
7039 [36004]: https://github.com/rust-lang/rust/pull/36004
7040 [36008]: https://github.com/rust-lang/rust/pull/36008
7041 [36014]: https://github.com/rust-lang/rust/pull/36014
7042 [36029]: https://github.com/rust-lang/rust/pull/36029
7043 [36059]: https://github.com/rust-lang/rust/pull/36059
7044 [36072]: https://github.com/rust-lang/rust/pull/36072
7045 [36101]: https://github.com/rust-lang/rust/pull/36101
7046 [36104]: https://github.com/rust-lang/rust/pull/36104
7047 [36171]: https://github.com/rust-lang/rust/pull/36171
7048 [36173]: https://github.com/rust-lang/rust/pull/36173
7049 [36178]: https://github.com/rust-lang/rust/pull/36178
7050 [36213]: https://github.com/rust-lang/rust/pull/36213
7051 [36214]: https://github.com/rust-lang/rust/pull/36214
7052 [36264]: https://github.com/rust-lang/rust/pull/36264
7053 [36266]: https://github.com/rust-lang/rust/pull/36266
7054 [36289]: https://github.com/rust-lang/rust/pull/36289
7055 [36338]: https://github.com/rust-lang/rust/pull/36338
7056 [36351]: https://github.com/rust-lang/rust/pull/36351
7057 [36355]: https://github.com/rust-lang/rust/pull/36355
7058 [36369]: https://github.com/rust-lang/rust/pull/36369
7059 [36372]: https://github.com/rust-lang/rust/pull/36372
7060 [36423]: https://github.com/rust-lang/rust/pull/36423
7061 [36482]: https://github.com/rust-lang/rust/pull/36482
7062 [36505]: https://github.com/rust-lang/rust/pull/36505
7063 [36524]: https://github.com/rust-lang/rust/pull/36524
7064 [36527]: https://github.com/rust-lang/rust/pull/36527
7065 [36551]: https://github.com/rust-lang/rust/pull/36551
7066 [36574]: https://github.com/rust-lang/rust/pull/36574
7067 [36586]: https://github.com/rust-lang/rust/pull/36586
7068 [36592]: https://github.com/rust-lang/rust/pull/36592
7069 [36631]: https://github.com/rust-lang/rust/pull/36631
7070 [36639]: https://github.com/rust-lang/rust/pull/36639
7071 [36721]: https://github.com/rust-lang/rust/pull/36721
7072 [36727]: https://github.com/rust-lang/rust/pull/36727
7073 [36730]: https://github.com/rust-lang/rust/pull/36730
7074 [36734]: https://github.com/rust-lang/rust/pull/36734
7075 [36754]: https://github.com/rust-lang/rust/pull/36754
7076 [36995]: https://github.com/rust-lang/rust/pull/36995
7077 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7078 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7079 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7080 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7081 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7082 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7083 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7084 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7085 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7086 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7087 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7088 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7089 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7090 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7091 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7092 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7093 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7094 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7095 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7096 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7097 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7098 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7099 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7100 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7101 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7102 [rustup]: https://www.rustup.rs
7103 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7104 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7105 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7106 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7107 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7108 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7109 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7112 Version 1.12.1 (2016-10-20)
7113 ===========================
7118 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7119 * [Confusion with double negation and booleans][36856]
7120 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7121 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7122 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7123 * [Corrupted memory after updated to 1.12][36936]
7124 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7125 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7126 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7128 [36381]: https://github.com/rust-lang/rust/issues/36381
7129 [36856]: https://github.com/rust-lang/rust/issues/36856
7130 [36875]: https://github.com/rust-lang/rust/issues/36875
7131 [36924]: https://github.com/rust-lang/rust/issues/36924
7132 [36926]: https://github.com/rust-lang/rust/issues/36926
7133 [36936]: https://github.com/rust-lang/rust/issues/36936
7134 [37026]: https://github.com/rust-lang/rust/issues/37026
7135 [37112]: https://github.com/rust-lang/rust/issues/37112
7136 [37153]: https://github.com/rust-lang/rust/issues/37153
7139 Version 1.12.0 (2016-09-29)
7140 ===========================
7145 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7146 This translation pass is far simpler than the previous AST->LLVM pass, and
7147 creates opportunities to perform new optimizations directly on the MIR. It
7148 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7149 * [`rustc` presents a new, more readable error format, along with
7150 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7151 Most common editors supporting Rust have been updated to work with it. It was
7152 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7157 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7158 This translation pass is far simpler than the previous AST->LLVM pass, and
7159 creates opportunities to perform new optimizations directly on the MIR. It
7160 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7161 * [Print the Rust target name, not the LLVM target name, with
7162 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7163 * [The computation of `TypeId` is correct in some cases where it was previously
7164 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7165 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7166 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7167 `--print relocation-models`, and `--print code-models` print the available
7168 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7169 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7170 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7171 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7172 These targets produce statically-linked binaries. There are no binary release
7178 * [`rustc` presents a new, more readable error format, along with
7179 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7180 Most common editors supporting Rust have been updated to work with it. It was
7181 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7182 * [In error descriptions, references are now described in plain English,
7183 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7184 * [In error type descriptions, unknown numeric types are named `{integer}` or
7185 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7186 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7191 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7192 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7193 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7194 useful](https://github.com/rust-lang/rust/pull/34908)
7195 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7196 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7197 * [Semicolons are properly required as statement delimiters inside
7198 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7199 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7204 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7205 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7206 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7207 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7208 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7209 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7210 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7211 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7212 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7213 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7214 Both on Unix and Windows.
7215 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7216 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7217 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7218 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7219 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7220 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7221 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7222 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7227 * [The `format!` macro and friends now allow a single argument to be formatted
7228 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7229 * [The lifetime bounds on `[T]::binary_search_by` and
7230 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7231 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7232 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7233 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7234 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7235 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7236 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7237 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7238 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7239 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7240 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7241 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7242 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7243 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7244 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7245 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7246 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7247 * [`mpsc::sync_channel` `Receiver`s return any available message before
7248 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7249 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7250 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7255 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7256 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7257 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7258 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7259 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7260 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7261 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7262 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7263 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7264 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7265 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7266 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7267 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7268 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7269 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7270 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7275 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7276 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7281 * [Test binaries now support a `--test-threads` argument to specify the number
7282 of threads used to run tests, and which acts the same as the
7283 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7284 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7285 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7286 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7287 * [Rust releases now come with source packages that can be installed by rustup
7288 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7289 The resulting source code can be used by tools and IDES, located in the
7290 sysroot under `lib/rustlib/src`.
7295 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7296 * Many minor improvements to the documentation.
7297 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7302 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7303 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7304 * [When formatting strings, if "precision" is specified, the "fill",
7305 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7306 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7309 Version 1.11.0 (2016-08-18)
7310 ===========================
7315 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7316 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7317 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7318 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7323 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7324 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7325 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7326 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7327 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7328 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7329 (in libcore - previously stabilized in libstd)
7330 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7331 (in libcore - previously stabilized in libstd)
7332 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7333 (in libcore - previously stabilized in libstd)
7334 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7335 (in libcore - previously stabilized in libstd)
7336 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7337 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7338 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7339 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7344 * [The `thread_local!` macro supports multiple definitions in a single
7345 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7346 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7347 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7348 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7349 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7350 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7351 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7352 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7357 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7358 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7359 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7360 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7361 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7362 and `-vv` prints warnings for all crates.
7363 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7364 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7365 This provides room for expansion by arbitrary tools.
7366 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7367 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7368 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7369 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7370 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7371 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7372 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7377 * [Caching projections speeds up type check dramatically for some
7378 workloads](https://github.com/rust-lang/rust/pull/33816)
7379 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7380 This hasher is faster, but is believed to provide sufficient
7381 protection from collision attacks.
7382 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7387 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7388 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7389 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7390 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7391 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7396 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7397 * [When emitting debug info, rustc emits frame pointers for closures,
7398 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7399 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7400 * Many more errors have been given error codes and extended
7402 * API documentation continues to be improved, with many new examples
7407 * [rustc no longer hangs when dependencies recursively re-export
7408 submodules](https://github.com/rust-lang/rust/pull/34542)
7409 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7410 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7411 rewritten](https://github.com/rust-lang/rust/pull/33895)
7412 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7413 No targets use this yet, but it works toward AVR support.
7418 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7419 * [The new follow-set rules that place restrictions on `macro_rules!`
7420 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7421 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7422 and has been a warning since 1.10.
7423 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7424 This causes breakage in some corner cases.
7427 Version 1.10.0 (2016-07-07)
7428 ===========================
7433 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7434 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7435 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7436 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7437 * [`panic!` can be converted to a runtime abort with the
7438 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7439 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7440 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7441 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7442 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7443 Note that Cargo does not yet directly support cdylibs.
7448 * `os::windows::fs::OpenOptionsExt::access_mode`
7449 * `os::windows::fs::OpenOptionsExt::share_mode`
7450 * `os::windows::fs::OpenOptionsExt::custom_flags`
7451 * `os::windows::fs::OpenOptionsExt::attributes`
7452 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7453 * `os::unix::fs::OpenOptionsExt::custom_flags`
7454 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7455 * `Default for sync::Weak`
7456 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7457 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7458 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7459 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7460 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7461 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7462 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7463 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7464 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7465 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7466 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7467 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7468 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7469 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7470 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7471 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7472 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7473 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7474 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7475 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7476 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7477 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7478 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7479 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7480 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7481 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7482 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7483 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7484 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7485 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7486 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7487 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7488 * Read/Write/RawFd impls for `UnixStream`
7489 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7490 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7491 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7492 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7493 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7494 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7495 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7496 * RawFd impls for `UnixListener`
7497 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7498 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7499 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7500 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7501 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7502 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7503 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7504 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7505 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7506 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7507 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7508 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7509 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7510 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7511 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7512 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7513 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7514 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7515 * RawFd impls for `UnixDatagram`
7516 * `{BTree,Hash}Map::values_mut`
7517 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7522 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7523 The semantics of this minor method are subtle and probably not what
7525 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7526 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7527 will fall back to `/dev/urandom` temporarily to avoid blocking
7528 during early boot](https://github.com/rust-lang/rust/pull/33086).
7529 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7530 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7531 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7532 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7533 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7534 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7535 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7539 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7540 This controls the runtime behavior of the `panic!` macro
7541 and can be either "unwind" (the default), or "abort".
7542 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7543 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7544 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7545 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7546 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7547 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7548 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7549 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7550 By default they are retried twice, which can be customized with the
7551 `net.retry` value in `.cargo/config`.
7552 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7553 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7554 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7555 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7556 Makes it possible to install multiple crates in parallel.
7557 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7558 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7559 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7560 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7561 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7562 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7567 * [rustc memory usage was reduced by refactoring the context used for
7568 type checking](https://github.com/rust-lang/rust/pull/33425).
7569 * [Speed up creation of `HashMap`s by caching the random keys used
7570 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7571 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7572 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7573 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7574 10x faster than the previous lookup tables.
7575 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7580 * Many incremental improvements to documentation and rustdoc.
7581 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7582 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7583 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7584 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7585 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7586 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7587 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7592 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7593 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7594 * [`std` no longer prints backtraces on platforms where the running
7595 module must be loaded with `env::current_exe`, which can't be relied
7596 on](https://github.com/rust-lang/rust/pull/33554).
7597 * This release includes std binaries for the i586-unknown-linux-gnu,
7598 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7599 i586 target is for old x86 hardware without SSE2, and the armv7
7600 target is for Android running on modern ARM architectures.
7601 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7602 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7603 * [On Unix the runtime aborts by calling `libc::abort` instead of
7604 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7605 * [Rust is now bootstrapped from the previous release of Rust,
7606 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7611 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7612 * [`target_env` for Linux ARM targets is just `gnu`, not
7613 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7614 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7615 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7616 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7617 Affects how macros are parsed.
7618 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7619 * [Feature-gated attributes on macro-generated macro invocations are
7620 now rejected](https://github.com/rust-lang/rust/pull/32791).
7621 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7622 This caused some minor changes to type inference.
7625 Version 1.9.0 (2016-05-26)
7626 ==========================
7631 * The `#[deprecated]` attribute when applied to an API will generate
7632 warnings when used. The warnings may be suppressed with
7633 `#[allow(deprecated)]`. [RFC 1270].
7634 * [`fn` item types are zero sized, and each `fn` names a unique
7635 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7636 `transmute` on a `fn` type will generate a warning for a few cycles,
7637 then will be converted to an error.
7638 * [Field and method resolution understand visibility, so private
7639 fields and methods cannot prevent the proper use of public fields
7640 and methods][1.9fv].
7641 * [The parser considers unicode codepoints in the
7642 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7648 * [`std::panic::catch_unwind`] (renamed from `recover`)
7649 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7650 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7651 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7652 * [`str::is_char_boundary`]
7653 * [`<*const T>::as_ref`]
7654 * [`<*mut T>::as_ref`]
7655 * [`<*mut T>::as_mut`]
7656 * [`AsciiExt::make_ascii_uppercase`]
7657 * [`AsciiExt::make_ascii_lowercase`]
7658 * [`char::decode_utf16`]
7659 * [`char::DecodeUtf16`]
7660 * [`char::DecodeUtf16Error`]
7661 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7662 * [`BTreeSet::take`]
7663 * [`BTreeSet::replace`]
7666 * [`HashSet::replace`]
7668 * [`OsString::with_capacity`]
7669 * [`OsString::clear`]
7670 * [`OsString::capacity`]
7671 * [`OsString::reserve`]
7672 * [`OsString::reserve_exact`]
7673 * [`OsStr::is_empty`]
7675 * [`std::os::unix::thread`]
7678 * [`JoinHandleExt::as_pthread_t`]
7679 * [`JoinHandleExt::into_pthread_t`]
7680 * [`HashSet::hasher`]
7681 * [`HashMap::hasher`]
7682 * [`CommandExt::exec`]
7683 * [`File::try_clone`]
7684 * [`SocketAddr::set_ip`]
7685 * [`SocketAddr::set_port`]
7686 * [`SocketAddrV4::set_ip`]
7687 * [`SocketAddrV4::set_port`]
7688 * [`SocketAddrV6::set_ip`]
7689 * [`SocketAddrV6::set_port`]
7690 * [`SocketAddrV6::set_flowinfo`]
7691 * [`SocketAddrV6::set_scope_id`]
7692 * [`slice::copy_from_slice`]
7693 * [`ptr::read_volatile`]
7694 * [`ptr::write_volatile`]
7695 * [`OpenOptions::create_new`]
7696 * [`TcpStream::set_nodelay`]
7697 * [`TcpStream::nodelay`]
7698 * [`TcpStream::set_ttl`]
7699 * [`TcpStream::ttl`]
7700 * [`TcpStream::set_only_v6`]
7701 * [`TcpStream::only_v6`]
7702 * [`TcpStream::take_error`]
7703 * [`TcpStream::set_nonblocking`]
7704 * [`TcpListener::set_ttl`]
7705 * [`TcpListener::ttl`]
7706 * [`TcpListener::set_only_v6`]
7707 * [`TcpListener::only_v6`]
7708 * [`TcpListener::take_error`]
7709 * [`TcpListener::set_nonblocking`]
7710 * [`UdpSocket::set_broadcast`]
7711 * [`UdpSocket::broadcast`]
7712 * [`UdpSocket::set_multicast_loop_v4`]
7713 * [`UdpSocket::multicast_loop_v4`]
7714 * [`UdpSocket::set_multicast_ttl_v4`]
7715 * [`UdpSocket::multicast_ttl_v4`]
7716 * [`UdpSocket::set_multicast_loop_v6`]
7717 * [`UdpSocket::multicast_loop_v6`]
7718 * [`UdpSocket::set_multicast_ttl_v6`]
7719 * [`UdpSocket::multicast_ttl_v6`]
7720 * [`UdpSocket::set_ttl`]
7721 * [`UdpSocket::ttl`]
7722 * [`UdpSocket::set_only_v6`]
7723 * [`UdpSocket::only_v6`]
7724 * [`UdpSocket::join_multicast_v4`]
7725 * [`UdpSocket::join_multicast_v6`]
7726 * [`UdpSocket::leave_multicast_v4`]
7727 * [`UdpSocket::leave_multicast_v6`]
7728 * [`UdpSocket::take_error`]
7729 * [`UdpSocket::connect`]
7730 * [`UdpSocket::send`]
7731 * [`UdpSocket::recv`]
7732 * [`UdpSocket::set_nonblocking`]
7737 * [`std::sync::Once` is poisoned if its initialization function
7739 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7740 * [Most types implement `fmt::Debug`][1.9db].
7741 * [The default buffer size used by `BufReader` and `BufWriter` was
7742 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7743 used by other languages.
7744 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7745 `Duration` additionally implements `*=` and `/=`][1.9ta].
7746 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7747 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7748 * [`Chain` implements `BufRead`][1.9ch].
7749 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7754 * [Cargo can now run concurrently][1.9cc].
7755 * [Top-level overrides allow specific revisions of crates to be
7756 overridden through the entire crate graph][1.9ct]. This is intended
7757 to make upgrades easier for large projects, by allowing crates to be
7758 forked temporarily until they've been upgraded and republished.
7759 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7760 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7761 on the commandline][1.9cf]. `rustc` arguments can also be specified
7762 in the `build.rustflags` configuration key.
7767 * [The time complexity of comparing variables for equivalence during type
7768 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7769 to major compilation time improvement in some scenarios.
7770 * [`ToString` is specialized for `str`, giving it the same performance
7771 as `to_owned`][1.9ts].
7772 * [Spawning processes with `Command::output` no longer creates extra
7774 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7775 for C-like enums][1.9cl].
7780 * [Passing the `--quiet` flag to a test runner will produce
7781 much-abbreviated output][1.9q].
7782 * The Rust Project now publishes std binaries for the
7783 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7784 `i586-pc-windows-msvc` targets.
7789 * [`std::sync::Once` is poisoned if its initialization function
7791 * [It is illegal to define methods with the same name in overlapping
7792 inherent `impl` blocks][1.9sn].
7793 * [`fn` item types are zero sized, and each `fn` names a unique
7794 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7795 `transmute` on a `fn` type will generate a warning for a few cycles,
7796 then will be converted to an error.
7797 * [Improvements to const evaluation may trigger new errors when integer
7798 literals are out of range][1.9ce].
7801 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7802 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7803 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7804 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7805 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7806 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7807 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7808 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7809 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7810 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7811 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7812 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7813 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7814 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7815 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7816 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7817 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7818 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7819 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7820 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7821 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7822 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7823 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7824 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7825 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7826 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7827 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7828 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7829 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7830 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7831 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7832 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7833 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7834 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7835 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7836 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7837 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7838 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7839 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7840 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7841 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7842 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7843 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7844 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7845 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7846 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7847 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7848 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7849 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7850 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7851 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7852 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7853 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7854 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7855 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7856 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7857 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7858 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7859 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7860 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7861 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7862 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7863 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7864 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7865 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7866 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7867 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7868 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7869 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7870 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7871 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7872 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7873 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7874 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7875 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7876 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7877 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7878 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7879 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7880 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7881 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7882 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7883 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7884 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7885 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7886 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7887 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7888 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7889 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7890 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7891 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7892 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7893 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7894 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7895 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7896 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7897 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7898 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7899 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7900 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7901 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7902 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7903 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7904 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7905 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7906 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7907 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7908 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7909 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7910 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7913 Version 1.8.0 (2016-04-14)
7914 ==========================
7919 * Rust supports overloading of compound assignment statements like
7920 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7921 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7922 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7924 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7925 addition to the non-braced form, `struct Foo;`. [RFC 218].
7931 * [`str::encode_utf16`] (renamed from `utf16_units`)
7932 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7935 * [`ptr::drop_in_place`]
7937 * [`time::SystemTime`]
7939 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7940 * [`Instant::elapsed`]
7941 * [`SystemTime::now`]
7942 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7943 * [`SystemTime::elapsed`]
7944 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7945 * [`SystemTimeError`]
7946 * [`SystemTimeError::duration`]
7947 * Various impls for `SystemTimeError`
7949 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7950 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7951 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7952 * [The `write!` and `writeln!` macros correctly emit errors if any of
7953 their arguments can't be formatted][1.8w].
7954 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7955 * [The Unix-specific `raw` modules, which contain a number of
7956 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7957 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7958 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7959 across platforms was making it difficult to implement `std`
7960 correctly. Those that need these definitions should use the `libc`
7962 * The Unix-specific `MetadataExt` traits, including
7963 `os::unix::fs::MetadataExt`, which expose values such as inode
7964 numbers [no longer return platform-specific types][1.8r], but
7965 instead return widened integers. [RFC 1415].
7966 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7967 * [Atomic loads and stores are not volatile][1.8a].
7968 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7973 * [Inlining hash functions lead to a 3% compile-time improvement in
7974 some workloads][1.8h].
7975 * When using jemalloc, its symbols are [unprefixed so that it
7976 overrides the libc malloc implementation][1.8h]. This means that for
7977 rustc, LLVM is now using jemalloc, which results in a 6%
7978 compile-time improvement on a specific workload.
7979 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7984 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7985 i686-pc-windows-msvc is now considered a tier-1 platform.
7986 * [The `--print targets` flag prints a list of supported targets][1.8t].
7987 * [The `--print cfg` flag prints the `cfg`s defined for the current
7989 * [`rustc` can be built with an new Cargo-based build system, written
7990 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7991 build system. To enable it configure with `configure --rustbuild`.
7992 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7993 variants while also indicating the total number of missing variants
7994 if more than 3][1.8m].
7995 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7996 * The Rust Project now publishes binary releases of the standard
7997 library for a number of tier-2 targets:
7998 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7999 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8000 `x86_64-rumprun-netbsd`. These can be installed with
8001 tools such as [multirust][1.8mr].
8006 * [`cargo init` creates a new Cargo project in the current
8007 directory][1.8ci]. It is otherwise like `cargo new`.
8008 * [Cargo has configuration keys for `-v` and
8009 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8010 `[term]` section of `.cargo/config`.
8011 * [Configuration keys that evaluate to strings or integers can be set
8012 via environment variables][1.8ce]. For example the `build.jobs` key
8013 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8014 precedence over config files.
8015 * [Target-specific dependencies support Rust `cfg` syntax for
8016 describing targets][1.8cfg] so that dependencies for multiple
8017 targets can be specified together. [RFC 1361].
8018 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8019 `RUSTDOC` take precedence over the `build.target-dir`,
8020 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
8021 * [The child process tree is killed on Windows when Cargo is
8023 * [The `build.target` configuration value sets the target platform,
8024 like `--target`][1.8ct].
8029 * [Unstable compiler flags have been further restricted][1.8u]. Since
8030 1.0 `-Z` flags have been considered unstable, and other flags that
8031 were considered unstable additionally required passing `-Z
8032 unstable-options` to access. Unlike unstable language and library
8033 features though, these options have been accessible on the stable
8034 release channel. Going forward, *new unstable flags will not be
8035 available on the stable release channel*, and old unstable flags
8036 will warn about their usage. In the future, all unstable flags will
8037 be unavailable on the stable release channel.
8038 * [It is no longer possible to `match` on empty enum variants using
8039 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8040 * The Unix-specific `MetadataExt` traits, including
8041 `os::unix::fs::MetadataExt`, which expose values such as inode
8042 numbers [no longer return platform-specific types][1.8r], but
8043 instead return widened integers. [RFC 1415].
8044 * [Modules sourced from the filesystem cannot appear within arbitrary
8045 blocks, but only within other modules][1.8mf].
8046 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8047 * On Unix, [stack overflow triggers a runtime abort instead of a
8049 * [`Command::spawn` and its equivalents return an error if any of
8050 its command-line arguments contain interior `NUL`s][1.8n].
8051 * [Tuple and unit enum variants from other crates are in the type
8053 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8054 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8055 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8056 instead of `foo.lib`.
8059 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8060 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8061 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8062 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8063 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8064 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8065 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8066 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8067 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8068 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8069 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8070 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
8071 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8072 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8073 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8074 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8075 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8076 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8077 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8078 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8079 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8080 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8081 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8082 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8083 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8084 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8085 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8086 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8087 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8088 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8089 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8090 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8091 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8092 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8093 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8094 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8095 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8096 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8097 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8098 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8099 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8100 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8101 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8102 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8103 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8104 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8105 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8106 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8107 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8108 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8109 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8110 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8111 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8112 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8113 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8114 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8115 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8116 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8117 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8118 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8121 Version 1.7.0 (2016-03-03)
8122 ==========================
8129 * [`Path::strip_prefix`] (renamed from relative_from)
8130 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8132 * [`Ipv4Addr::is_loopback`]
8133 * [`Ipv4Addr::is_private`]
8134 * [`Ipv4Addr::is_link_local`]
8135 * [`Ipv4Addr::is_multicast`]
8136 * [`Ipv4Addr::is_broadcast`]
8137 * [`Ipv4Addr::is_documentation`]
8139 * [`Ipv6Addr::is_unspecified`]
8140 * [`Ipv6Addr::is_loopback`]
8141 * [`Ipv6Addr::is_multicast`]
8144 * [`Vec::as_mut_slice`]
8146 * [`String::as_str`]
8147 * [`String::as_mut_str`]
8149 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8151 * `<[T]>::`[`sort_by_key`]
8152 * checked, saturated, and overflowing operations
8153 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8154 * [`i32::saturating_mul`]
8155 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8156 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8157 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8158 * [`u32::saturating_mul`]
8159 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8160 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8161 * and checked, saturated, and overflowing operations for other primitive types
8163 * [`ffi::IntoStringError`]
8164 * [`CString::into_string`]
8165 * [`CString::into_bytes`]
8166 * [`CString::into_bytes_with_nul`]
8167 * `From<CString> for Vec<u8>`
8169 * [`IntoStringError::into_cstring`]
8170 * [`IntoStringError::utf8_error`]
8171 * `Error for IntoStringError`
8173 * [`std::hash::BuildHasher`]
8174 * [`BuildHasher::Hasher`]
8175 * [`BuildHasher::build_hasher`]
8176 * [`std::hash::BuildHasherDefault`]
8177 * [`HashMap::with_hasher`]
8178 * [`HashMap::with_capacity_and_hasher`]
8179 * [`HashSet::with_hasher`]
8180 * [`HashSet::with_capacity_and_hasher`]
8181 * [`std::collections::hash_map::RandomState`]
8182 * [`RandomState::new`]
8183 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8184 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8185 from bytes is faster.
8186 * [The performance of `LineWriter` (and thus `io::stdout`) was
8187 improved by using `memchr` to search for newlines][1.7m].
8188 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8189 `f64` variants were stabilized previously.
8190 * [`BTreeMap` was rewritten to use less memory and improve the performance
8191 of insertion and iteration, the latter by as much as 5x][1.7bm].
8192 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8193 covariant over their contained type][1.7bt].
8194 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8195 over their contained type][1.7ll].
8196 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8198 * [`Any` is implemented for unsized types][1.7a].
8199 * [`Hash` is implemented for `Duration`][1.7h].
8204 * [When running tests with `--test`, rustdoc will pass `--cfg`
8205 arguments to the compiler][1.7dt].
8206 * [The compiler is built with RPATH information by default][1.7rpa].
8207 This means that it will be possible to run `rustc` when installed in
8208 unusual configurations without configuring the dynamic linker search
8210 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8211 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8212 over `LD_LIBRARY_PATH`.
8217 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8218 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8219 * [The `rerun-if-changed` build script directive no longer causes the
8220 build script to incorrectly run twice in certain scenarios][1.7rr].
8225 * Soundness fixes to the interactions between associated types and
8226 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8227 code that violates the new rules. This is a significant change that
8228 is known to break existing code, so it has emitted warnings for the
8229 new error cases since 1.4 to give crate authors time to adapt. The
8230 details of what is changing are subtle; read the RFC for more.
8231 * [Several bugs in the compiler's visibility calculations were
8232 fixed][1.7v]. Since this was found to break significant amounts of
8233 code, the new errors will be emitted as warnings for several release
8234 cycles, under the `private_in_public` lint.
8235 * Defaulted type parameters were accidentally accepted in positions
8236 that were not intended. In this release, [defaulted type parameters
8237 appearing outside of type definitions will generate a
8238 warning][1.7d], which will become an error in future releases.
8239 * [Parsing "." as a float results in an error instead of 0][1.7p].
8240 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8241 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8243 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8244 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8245 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8246 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8247 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8248 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8249 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8250 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8251 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8252 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8253 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8254 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8255 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8256 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8257 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8258 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8259 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8260 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8261 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8262 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8263 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8264 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8265 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8266 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8267 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8268 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8269 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8270 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8271 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8272 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8273 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8274 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8275 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8276 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8277 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8278 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8279 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8280 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8281 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8282 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8283 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8284 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8285 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8286 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8287 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8288 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8289 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8290 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8291 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8292 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8293 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8294 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8295 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8296 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8297 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8298 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8299 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8300 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8301 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8302 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8303 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8304 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8305 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8306 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8307 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8308 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8309 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8310 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8311 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8312 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8313 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8314 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8315 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8316 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8317 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8318 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8319 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8320 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8321 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8324 Version 1.6.0 (2016-01-21)
8325 ==========================
8330 * The `#![no_std]` attribute causes a crate to not be linked to the
8331 standard library, but only the [core library][1.6co], as described
8332 in [RFC 1184]. The core library defines common types and traits but
8333 has no platform dependencies whatsoever, and is the basis for Rust
8334 software in environments that cannot support a full port of the
8335 standard library, such as operating systems. Most of the core
8336 library is now stable.
8342 [`Read::read_exact`],
8343 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8344 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8345 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8346 [`os::unix::fs::DirBuilderExt`],
8347 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8348 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8349 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8350 [`collections::hash_map::Drain`],
8351 [`collections::hash_map::HashMap::drain`],
8352 [`collections::hash_set::Drain`],
8353 [`collections::hash_set::HashSet::drain`],
8354 [`collections::binary_heap::Drain`],
8355 [`collections::binary_heap::BinaryHeap::drain`],
8356 [`Vec::extend_from_slice`] (renamed from `push_all`),
8357 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8358 [`RwLock::into_inner`],
8359 [`Iterator::min_by_key`] (renamed from `min_by`),
8360 [`Iterator::max_by_key`] (renamed from `max_by`).
8361 * The [core library][1.6co] is stable, as are most of its APIs.
8362 * [The `assert_eq!` macro supports arguments that don't implement
8363 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8365 * Several timer functions that take duration in milliseconds [are
8366 deprecated in favor of those that take `Duration`][1.6ms]. These
8367 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8368 `thread::park_timeout_ms`.
8369 * The algorithm by which `Vec` reserves additional elements was
8370 [tweaked to not allocate excessive space][1.6a] while still growing
8372 * `From` conversions are [implemented from integers to floats][1.6f]
8373 in cases where the conversion is lossless. Thus they are not
8374 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8375 or `f64`. They are also not implemented for `isize` and `usize`
8376 because the implementations would be platform-specific. `From` is
8377 also implemented from `f32` to `f64`.
8378 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8379 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8380 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8381 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8383 * Sorting slices that are already sorted [is 50% faster in some
8389 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8390 * Cargo build scripts can specify their dependencies by emitting the
8391 [`rerun-if-changed`][1.6rr] key.
8392 * crates.io will reject publication of crates with dependencies that
8393 have a wildcard version constraint. Crates with wildcard
8394 dependencies were seen to cause a variety of problems, as described
8395 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8397 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8398 release folder. A variety of artifacts that Cargo failed to clean
8399 are now correctly deleted.
8404 * The `unreachable_code` lint [warns when a function call's argument
8406 * The parser indicates [failures that may be caused by
8407 confusingly-similar Unicode characters][1.6uc]
8408 * Certain macro errors [are reported at definition time][1.6m], not
8414 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8415 environment variable when locating crates. This was a pre-cargo
8416 feature for integrating with the package manager that was
8417 accidentally never removed.
8418 * [A number of bugs were fixed in the privacy checker][1.6p] that
8419 could cause previously-accepted code to break.
8420 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8421 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8422 struct pattern syntax (`Foo(..)`) can no longer be used to match
8423 unit structs. This is a warning now, but will become an error in
8424 future releases. Patterns that share the same name as a const are
8426 * A bug was fixed that causes [rustc not to apply default type
8427 parameters][1.6xc] when resolving certain method implementations of
8428 traits defined in other crates.
8430 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8431 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8432 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8433 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8434 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8435 [1.6co]: http://doc.rust-lang.org/core/index.html
8436 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8437 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8438 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8439 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8440 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8441 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8442 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8443 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8444 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8445 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8446 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8447 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8448 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8449 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8450 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8451 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8452 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8453 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8454 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8455 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8456 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8457 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8458 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8459 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8460 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8461 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8462 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8463 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8464 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8465 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8466 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8467 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8468 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8469 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8470 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8471 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8472 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8473 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8474 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8475 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8476 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8479 Version 1.5.0 (2015-12-10)
8480 ==========================
8482 * ~700 changes, numerous bugfixes
8488 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8489 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8490 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8491 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8492 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8493 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8494 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8495 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8496 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8497 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8498 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8499 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8500 [`Path::read_link`], [`Path::symlink_metadata`],
8501 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8502 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8503 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8504 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8505 [`slice::split_first_mut`], [`slice::split_first`],
8506 [`slice::split_last_mut`], [`slice::split_last`],
8507 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8508 [`str::MatchIndices`], [`str::RMatchIndices`],
8509 [`str::match_indices`], [`str::rmatch_indices`],
8510 [`str::slice_mut_unchecked`], [`string::ParseError`].
8511 * Rust applications hosted on crates.io can be installed locally to
8512 `~/.cargo/bin` with the [`cargo install`] command. Among other
8513 things this makes it easier to augment Cargo with new subcommands:
8514 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8515 invoked as `cargo foo`.
8516 * Crates with wildcard (`*`) dependencies will [emit warnings when
8517 published][1.5w]. In 1.6 it will no longer be possible to publish
8518 crates with wildcard dependencies.
8523 * The rules determining when a particular lifetime must outlive
8524 a particular value (known as '[dropck]') have been [modified
8525 to not rely on parametricity][1.5p].
8526 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8527 and `Arc`][1.5a]. Because these smart pointer types implement
8528 `Deref`, this causes breakage in cases where the interior type
8529 contains methods of the same name.
8530 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8531 that they could drop their content. Soundness fix.
8532 * All method invocations are [properly checked][1.5wf1] for
8533 [well-formedness][1.5wf2]. Soundness fix.
8534 * Traits whose supertraits contain `Self` are [not object
8535 safe][1.5o]. Soundness fix.
8536 * Target specifications support a [`no_default_libraries`][1.5nd]
8537 setting that controls whether `-nodefaultlibs` is passed to the
8538 linker, and in turn the `is_like_windows` setting no longer affects
8539 the `-nodefaultlibs` flag.
8540 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8541 * The `#[inline]` and `#[repr]` attributes [can only appear
8542 in valid locations][1.5at].
8543 * Native libraries linked from the local crate are [passed to
8544 the linker before native libraries from upstream crates][1.5nl].
8545 * Two rarely-used attributes, `#[no_debug]` and
8546 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8547 * Negation of unsigned integers, which has been a warning for
8548 several releases, [is now behind a feature gate and will
8549 generate errors][1.5nu].
8550 * The parser accidentally accepted visibility modifiers on
8551 enum variants, a bug [which has been fixed][1.5ev].
8552 * [A bug was fixed that allowed `use` statements to import unstable
8558 * When evaluating expressions at compile-time that are not
8559 compile-time constants (const-evaluating expressions in non-const
8560 contexts), incorrect code such as overlong bitshifts and arithmetic
8561 overflow will [generate a warning instead of an error][1.5ce],
8562 delaying the error until runtime. This will allow the
8563 const-evaluator to be expanded in the future backwards-compatibly.
8564 * The `improper_ctypes` lint [no longer warns about using `isize` and
8565 `usize` in FFI][1.5ict].
8570 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8572 * `Default` is [implemented for mutable slices][1.5d].
8573 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8574 * There are now `From` conversions [between floating point
8575 types][1.5f] where the conversions are lossless.
8576 * There are now `From` conversions [between integer types][1.5i] where
8577 the conversions are lossless.
8578 * [`fs::Metadata` implements `Clone`][1.5fs].
8579 * The `parse` method [accepts a leading "+" when parsing
8581 * [`AsMut` is implemented for `Vec`][1.5am].
8582 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8583 been optimized][1.5cf] and no longer rely on the default impl.
8584 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8585 `unsafe extern "C"` function types now [implement `Clone`,
8586 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8587 `fmt::Debug` for up to 12 arguments][1.5fp].
8588 * [Dropping `Vec`s is much faster in unoptimized builds when the
8589 element types don't implement `Drop`][1.5dv].
8590 * A bug that caused in incorrect behavior when [combining `VecDeque`
8591 with zero-sized types][1.5vdz] was resolved.
8592 * [`PartialOrd` for slices is faster][1.5po].
8597 * [Crate metadata size was reduced by 20%][1.5md].
8598 * [Improvements to code generation reduced the size of libcore by 3.3
8599 MB and rustc's memory usage by 18MB][1.5m].
8600 * [Improvements to deref translation increased performance in
8601 unoptimized builds][1.5dr].
8602 * Various errors in trait resolution [are deduplicated to only be
8603 reported once][1.5te].
8604 * Rust has preliminary [support for rumprun kernels][1.5rr].
8605 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8607 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8608 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8609 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8610 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8611 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8612 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8613 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8614 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8615 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8616 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8617 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8618 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8619 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8620 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8621 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8622 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8623 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8624 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8625 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8626 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8627 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8628 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8629 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8630 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8631 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8632 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8633 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8634 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8635 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8636 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8637 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8638 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8639 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8640 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8641 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8642 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8643 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8644 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8645 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8646 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8647 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8648 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8649 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8650 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8651 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8652 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8653 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8654 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8655 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8656 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8657 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8658 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8659 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8660 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8661 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8662 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8663 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8664 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8665 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8666 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8667 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8668 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8669 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8670 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8671 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8672 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8673 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8674 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8675 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8676 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8677 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8678 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8679 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8680 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8681 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8682 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8683 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8684 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8685 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8686 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8687 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8688 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8689 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8690 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8691 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8692 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8693 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8694 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8695 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8697 Version 1.4.0 (2015-10-29)
8698 ==========================
8700 * ~1200 changes, numerous bugfixes
8705 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8706 GNU) are now supported and recommended for use.
8711 * [Several changes have been made to fix type soundness and improve
8712 the behavior of associated types][sound]. See [RFC 1214]. Although
8713 we have mostly introduced these changes as warnings this release, to
8714 become errors next release, there are still some scenarios that will
8715 see immediate breakage.
8716 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8717 line breaks in addition to `\n`][crlf].
8718 * [Loans of `'static` lifetime extend to the end of a function][stat].
8719 * [`str::parse` no longer introduces avoidable rounding error when
8720 parsing floating point numbers. Together with earlier changes to
8721 float formatting/output, "round trips" like f.to_string().parse()
8722 now preserve the value of f exactly. Additionally, leading plus
8723 signs are now accepted][fp3].
8729 * `use` statements that import multiple items [can now rename
8730 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8731 * [Binops work correctly on fat pointers][binfat].
8732 * `pub extern crate`, which does not behave as expected, [issues a
8733 warning][pec] until a better solution is found.
8738 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8739 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8740 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8741 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8742 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8743 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8744 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8745 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8746 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8747 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8748 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8749 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8750 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8751 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8752 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8753 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8754 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8755 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8757 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8758 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8759 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8760 `f64::from_str_radix`.
8761 * [Reverse-searching strings is faster with the 'two-way'
8763 * [`std::io::copy` allows `?Sized` arguments][cc].
8764 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8765 [override `count`, `nth` and `last` with an *O*(1)
8766 implementation][it].
8767 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8768 * [`IntoRawFd` has been added to the Unix-specific prelude,
8769 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8771 * [`Extend<String>` and `FromIterator<String` are both implemented for
8773 * [`IntoIterator` is implemented for references to `Option` and
8775 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8776 Copy`][ext] as part of [RFC 839]. This will cause type inference
8777 breakage in rare situations.
8778 * [`BinaryHeap` implements `Debug`][bh2].
8779 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8781 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8782 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8783 * [String comparison is faster][faststr].
8784 * `&mut T` where `T: std::fmt::Write` [also implements
8785 `std::fmt::Write`][mutw].
8786 * [A stable regression in `VecDeque::push_back` and other
8787 capacity-altering methods that caused panics for zero-sized types
8789 * [Function pointers implement traits for up to 12 parameters][fp2].
8794 * The compiler [no longer uses the 'morestack' feature to prevent
8795 stack overflow][mm]. Instead it uses guard pages and stack
8796 probes (though stack probes are not yet implemented on any platform
8798 * [The compiler matches traits faster when projections are involved][p].
8799 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8801 * [Cargo now displays useful information about what its doing during
8802 `cargo update`][cu].
8804 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8805 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8806 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8807 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8808 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8809 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8810 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8811 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8812 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8813 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8814 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8815 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8816 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8817 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8818 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8819 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8820 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8821 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8822 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8823 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8824 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8825 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8826 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8827 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8828 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8829 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8830 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8831 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8832 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8833 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8834 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8835 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8836 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8837 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8838 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8839 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8840 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8841 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8842 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8843 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8844 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8845 [bh2]: https://github.com/rust-lang/rust/pull/28156
8846 [binfat]: https://github.com/rust-lang/rust/pull/28270
8847 [bm]: https://github.com/rust-lang/rust/pull/28197
8848 [cc]: https://github.com/rust-lang/rust/pull/27531
8849 [crlf]: https://github.com/rust-lang/rust/pull/28034
8850 [cu]: https://github.com/rust-lang/cargo/pull/1931
8851 [d]: https://github.com/rust-lang/rust/pull/27825
8852 [dep]: https://github.com/rust-lang/rust/pull/28339
8853 [es]: https://github.com/rust-lang/rust/pull/27956
8854 [ext]: https://github.com/rust-lang/rust/pull/28094
8855 [faststr]: https://github.com/rust-lang/rust/pull/28338
8856 [ffi]: https://github.com/rust-lang/rust/pull/28779
8857 [fp]: https://github.com/rust-lang/rust/pull/28268
8858 [fp2]: https://github.com/rust-lang/rust/pull/28560
8859 [fp3]: https://github.com/rust-lang/rust/pull/27307
8860 [i]: https://github.com/rust-lang/rust/pull/27451
8861 [into2]: https://github.com/rust-lang/rust/pull/28039
8862 [it]: https://github.com/rust-lang/rust/pull/27652
8863 [mm]: https://github.com/rust-lang/rust/pull/27338
8864 [mutw]: https://github.com/rust-lang/rust/pull/28368
8865 [sound]: https://github.com/rust-lang/rust/pull/27641
8866 [p]: https://github.com/rust-lang/rust/pull/27866
8867 [pec]: https://github.com/rust-lang/rust/pull/28486
8868 [pr]: https://github.com/rust-lang/rust/pull/27896
8869 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8870 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8871 [s]: https://github.com/rust-lang/rust/pull/27474
8872 [stab]: https://github.com/rust-lang/rust/pull/28339
8873 [stat]: https://github.com/rust-lang/rust/pull/28321
8874 [vd]: https://github.com/rust-lang/rust/pull/28494
8876 Version 1.3.0 (2015-09-17)
8877 ==============================
8879 * ~900 changes, numerous bugfixes
8884 * The [new object lifetime defaults][nold] have been [turned
8885 on][nold2] after a cycle of warnings about the change. Now types
8886 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8887 being interpreted as `&'a Box<Trait+'a>` to `&'a
8888 Box<Trait+'static>`.
8889 * [The Rustonomicon][nom] is a new book in the official documentation
8890 that dives into writing unsafe Rust.
8891 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8892 timekeeping is employed by other std APIs, as well as out-of-tree
8898 * The [new object lifetime defaults][nold] have been [turned
8899 on][nold2] after a cycle of warnings about the change.
8900 * There is a known [regression][lr] in how object lifetime elision is
8901 interpreted, the proper solution for which is undetermined.
8902 * The `#[prelude_import]` attribute, an internal implementation
8903 detail, was accidentally stabilized previously. [It has been put
8904 behind the `prelude_import` feature gate][pi]. This change is
8905 believed to break no existing code.
8906 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8907 [more sane for dynamically sized types][dst3]. Code that relied on
8908 the previous behavior is thought to be broken.
8909 * The `dropck` rules, which checks that destructors can't access
8910 destroyed values, [have been updated][dropck] to match the
8911 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8912 cause some previously-compiling code to no longer build.
8917 * The [new object lifetime defaults][nold] have been [turned
8918 on][nold2] after a cycle of warnings about the change.
8919 * Semicolons may [now follow types and paths in
8920 macros](https://github.com/rust-lang/rust/pull/27000).
8921 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8922 [more sane for dynamically sized types][dst3]. Code that relied on
8923 the previous behavior is not known to exist, and suspected to be
8925 * `'static` variables [may now be recursive][st].
8926 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8927 implementations correctly.
8928 * The `dropck` rules, which checks that destructors can't access
8929 destroyed values, [have been updated][dropck] to match the
8935 * The [`Duration`] API, [has been stabilized][ds], as well as the
8936 `std::time` module, which presently contains only `Duration`.
8937 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8938 * The owned C string, [`CString`], implements [`Borrow`] and the
8939 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8940 these allow C strings to be borrowed and cloned in generic code.
8941 * [`CStr`] implements [`Debug`].
8942 * [`AtomicPtr`] implements [`Debug`].
8943 * [`Error`] trait objects [can be downcast to their concrete types][e]
8944 in many common configurations, using the [`is`], [`downcast`],
8945 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8947 * Searching for substrings now [employs the two-way algorithm][search]
8948 instead of doing a naive search. This gives major speedups to a
8949 number of methods, including [`contains`][sc], [`find`][sf],
8950 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8951 [`ends_with`][sew] are also faster.
8952 * The performance of `PartialEq` for slices is [much faster][ps].
8953 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8954 is overridden and optimized by the implementations for scalars.
8955 * The [`Hasher`] trait now has a number of specialized `write_*`
8956 methods for primitive types, for efficiency.
8957 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8958 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8959 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8960 of [`std::error::Error::cause`][iec] also delegates to the inner
8962 * [`process::Child`][pc] gained the [`id`] method, which returns a
8963 `u32` representing the platform-specific process identifier.
8964 * The [`connect`] method on slices is deprecated, replaced by the new
8965 [`join`] method (note that both of these are on the *unstable*
8966 [`SliceConcatExt`] trait, but through the magic of the prelude are
8967 available to stable code anyway).
8968 * The [`Div`] operator is implemented for [`Wrapping`] types.
8969 * [`DerefMut` is implemented for `String`][dms].
8970 * Performance of SipHash (the default hasher for `HashMap`) is
8971 [better for long data][sh].
8972 * [`AtomicPtr`] implements [`Send`].
8973 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8974 are now [specialized to use uninitialized buffers for increased
8976 * Lifetime parameters of foreign functions [are now resolved
8982 * Rust can now, with some coercion, [produce programs that run on
8983 Windows XP][xp], though XP is not considered a supported platform.
8984 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8985 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8986 recommended for use in 1.3, though should be fully-functional
8987 in the [64-bit 1.4 beta][b14].
8988 * On Fedora-based systems installation will [properly configure the
8989 dynamic linker][fl].
8990 * The compiler gained many new extended error descriptions, which can
8991 be accessed with the `--explain` flag.
8992 * The `dropck` pass, which checks that destructors can't access
8993 destroyed values, [has been rewritten][dropck]. This fixes some
8994 soundness holes, and as such will cause some previously-compiling
8995 code to no longer build.
8996 * `rustc` now uses [LLVM to write archive files where possible][ar].
8997 Eventually this will eliminate the compiler's dependency on the ar
8999 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
9000 supported FreeBSD on x86_64).
9001 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9002 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9004 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9005 will kill the process instead of leaking][nlp].
9007 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9008 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9009 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9010 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9011 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9012 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9013 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9014 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9015 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9016 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9017 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9018 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9019 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9020 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9021 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9022 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9023 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9024 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9025 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9026 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9027 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9028 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9029 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9030 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9031 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9032 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9033 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9034 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9035 [ar]: https://github.com/rust-lang/rust/pull/26926
9036 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9037 [dms]: https://github.com/rust-lang/rust/pull/26241
9038 [dropck]: https://github.com/rust-lang/rust/pull/27261
9039 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9040 [ds]: https://github.com/rust-lang/rust/pull/26818
9041 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9042 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9043 [dst3]: https://github.com/rust-lang/rust/pull/27351
9044 [e]: https://github.com/rust-lang/rust/pull/24793
9045 [f]: https://github.com/rust-lang/rust/pull/26588
9046 [fb]: https://github.com/rust-lang/rust/pull/26959
9047 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9048 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9049 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9050 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9051 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9052 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9053 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9054 [lic]: https://github.com/rust-lang/rust/pull/26583
9055 [lnu]: https://github.com/rust-lang/rust/pull/27026
9056 [lr]: https://github.com/rust-lang/rust/issues/27248
9057 [lum]: https://github.com/rust-lang/rust/pull/26378
9058 [lur]: https://github.com/rust-lang/rust/pull/26783
9059 [nlp]: https://github.com/rust-lang/rust/pull/27176
9060 [nold2]: https://github.com/rust-lang/rust/pull/27045
9061 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9062 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9063 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9064 [pi]: https://github.com/rust-lang/rust/pull/26699
9065 [ps]: https://github.com/rust-lang/rust/pull/26884
9066 [rte]: https://github.com/rust-lang/rust/pull/26950
9067 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9068 [search]: https://github.com/rust-lang/rust/pull/26327
9069 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9070 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9071 [sh]: https://github.com/rust-lang/rust/pull/27280
9072 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9073 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9074 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9075 [st]: https://github.com/rust-lang/rust/pull/26630
9076 [win1]: https://github.com/rust-lang/rust/pull/26569
9077 [win2]: https://github.com/rust-lang/rust/pull/26741
9078 [win3]: https://github.com/rust-lang/rust/pull/26741
9079 [win4]: https://github.com/rust-lang/rust/pull/27210
9080 [xp]: https://github.com/rust-lang/rust/pull/26569
9082 Version 1.2.0 (2015-08-07)
9083 ==========================
9085 * ~1200 changes, numerous bugfixes
9090 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9091 like `Rc` to contain types without a fixed size, arrays and trait
9092 objects, finally enabling use of `Rc<[T]>` and completing the
9093 implementation of DST.
9094 * [Parallel codegen][parcodegen] is now working again, which can
9095 substantially speed up large builds in debug mode; It also gets
9096 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9097 jobs). It's not enabled by default, but will be "in the near
9098 future". It can be activated with the `-C codegen-units=N` flag to
9100 * This is the first release with [experimental support for linking
9101 with the MSVC linker and lib C on Windows (instead of using the GNU
9102 variants via MinGW)][win]. It is yet recommended only for the most
9103 intrepid Rustaceans.
9104 * Benchmark compilations are showing a 30% improvement in
9105 bootstrapping over 1.1.
9110 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9111 unicode case mapping, which is a previously-planned change in
9112 behavior and considered a bugfix.
9113 * [`mem::align_of`] now specifies [the *minimum alignment* for
9114 T][align], which is usually the alignment programs are interested
9115 in, and the same value reported by clang's
9116 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9118 * [The `#[packed]` attribute is no longer silently accepted by the
9119 compiler][packed]. This attribute did nothing and code that
9120 mentioned it likely did not work as intended.
9121 * Associated type defaults are [now behind the
9122 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9123 defaults *did not work*, but could be mentioned syntactically. As
9124 such this breakage has minimal impact.
9129 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9130 matching against dereferenceable values.
9135 * The [`Extend`] trait, which grows a collection from an iterator, is
9136 implemented over iterators of references, for `String`, `Vec`,
9137 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9138 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9139 * The [`iter::once`] function returns an iterator that yields a single
9140 element, and [`iter::empty`] returns an iterator that yields no
9142 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9143 over substring matches.
9144 * [`Cell`] and [`RefCell`] both implement `Eq`.
9145 * A number of methods for wrapping arithmetic are added to the
9146 integral types, [`wrapping_div`], [`wrapping_rem`],
9147 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9148 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9149 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9150 type.. It is illegal for the default arithmetic operations in Rust
9151 to overflow; the desire to wrap must be explicit.
9152 * The `{:#?}` formatting specifier [displays the alternate,
9153 pretty-printed][debugfmt] form of the `Debug` formatter. This
9154 feature was actually introduced prior to 1.0 with little
9156 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9157 for writing data to formatted strings, similar to [`io::Write`].
9158 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9159 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9160 are used by code generators to emit implementations of [`Debug`].
9161 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9162 methods that convert case, following Unicode case mapping.
9163 * It is now easier to handle poisoned locks. The [`PoisonError`]
9164 type, returned by failing lock operations, exposes `into_inner`,
9165 `get_ref`, and `get_mut`, which all give access to the inner lock
9166 guard, and allow the poisoned lock to continue to operate. The
9167 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9168 poisoned lock without attempting to take the lock.
9169 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9170 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9171 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9172 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9174 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9180 * `rustc` employs smarter heuristics for guessing at [typos].
9181 * `rustc` emits more efficient code for [no-op conversions between
9182 unsafe pointers][nop].
9183 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9184 resulting in faster compile times and smaller code.
9186 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9187 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9188 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9189 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9190 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9191 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9192 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9193 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9194 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9195 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9196 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9197 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9198 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9199 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9200 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9201 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9202 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9203 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9204 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9205 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9206 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9207 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9208 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9209 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9210 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9211 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9212 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9213 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9214 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9215 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9216 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9217 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9218 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9219 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9220 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9221 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9222 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9223 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9224 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9225 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9226 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9227 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9228 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9229 [align]: https://github.com/rust-lang/rust/pull/25646
9230 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9231 [typos]: https://github.com/rust-lang/rust/pull/26087
9232 [nop]: https://github.com/rust-lang/rust/pull/26336
9233 [fat]: https://github.com/rust-lang/rust/pull/26411
9234 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9235 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9236 [packed]: https://github.com/rust-lang/rust/pull/25541
9237 [ad]: https://github.com/rust-lang/rust/pull/27382
9238 [win]: https://github.com/rust-lang/rust/pull/25350
9240 Version 1.1.0 (2015-06-25)
9241 =========================
9243 * ~850 changes, numerous bugfixes
9248 * The [`std::fs` module has been expanded][fs] to expand the set of
9249 functionality exposed:
9250 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9251 don't incur a syscall on some platforms.
9252 * A `symlink_metadata` function has been added.
9253 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9254 access to all underlying information.
9255 * The compiler now contains extended explanations of many errors. When an error
9256 with an explanation occurs the compiler suggests using the `--explain` flag
9257 to read the explanation. Error explanations are also [available online][err-index].
9258 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9259 well as other work, the time to bootstrap the compiler decreased by
9265 * The [`str::split_whitespace`] method splits a string on unicode
9266 whitespace boundaries.
9267 * On both Windows and Unix, new extension traits provide conversion of
9268 I/O types to and from the underlying system handles. On Unix, these
9269 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9270 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9271 `TcpListener`, and `UpdSocket`. Further implementations for
9272 `std::process` will be stabilized later.
9273 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9274 Windows, symlinks can be created with
9275 `std::os::windows::symlink_dir` and
9276 `std::os::windows::symlink_file`.
9277 * The `mpsc::Receiver` type can now be converted into an iterator with
9278 `into_iter` on the [`IntoIterator`] trait.
9279 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9280 implementation of the [`From`] trait.
9281 * The `Debug` implementation for `RangeFull` [creates output that is
9282 more consistent with other implementations][rf].
9283 * [`Debug` is implemented for `File`][file].
9284 * The `Default` implementation for `Arc` [no longer requires `Sync +
9286 * [The `Iterator` methods `count`, `nth`, and `last` have been
9287 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9288 * Incorrect handling of paths on Windows has been improved in both the
9289 compiler and the standard library.
9290 * [`AtomicPtr` gained a `Default` implementation][ap].
9291 * In accordance with Rust's policy on arithmetic overflow `abs` now
9292 [panics on overflow when debug assertions are enabled][abs].
9293 * The [`Cloned`] iterator, which was accidentally left unstable for
9294 1.0 [has been stabilized][c].
9295 * The [`Incoming`] iterator, which iterates over incoming TCP
9296 connections, and which was accidentally unnamable in 1.0, [is now
9297 properly exported][inc].
9298 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9299 `sift_up` or `sift_down` panic][bh].
9300 * The [`split_off`] method of `LinkedList` [no longer corrupts
9301 the list in certain scenarios][ll].
9306 * Type checking performance [has improved notably][sk] with
9307 [multiple improvements][pre].
9308 * The compiler [suggests code changes][ch] for more errors.
9309 * rustc and it's build system have experimental support for [building
9310 toolchains against MUSL][m] instead of glibc on Linux.
9311 * The compiler defines the `target_env` cfg value, which is used for
9312 distinguishing toolchains that are otherwise for the same
9313 platform. Presently this is set to `gnu` for common GNU Linux
9314 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9315 * The [`cargo rustc`][crc] command invokes a build with custom flags
9317 * [Android executables are always position independent][pie].
9318 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9321 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9322 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9323 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9324 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9325 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9326 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9327 [rf]: https://github.com/rust-lang/rust/pull/24491
9328 [err-index]: https://doc.rust-lang.org/error-index.html
9329 [sk]: https://github.com/rust-lang/rust/pull/24615
9330 [pre]: https://github.com/rust-lang/rust/pull/25323
9331 [file]: https://github.com/rust-lang/rust/pull/24598
9332 [ch]: https://github.com/rust-lang/rust/pull/24683
9333 [arc]: https://github.com/rust-lang/rust/pull/24695
9334 [si]: https://github.com/rust-lang/rust/pull/24701
9335 [ap]: https://github.com/rust-lang/rust/pull/24834
9336 [m]: https://github.com/rust-lang/rust/pull/24777
9337 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9338 [crc]: https://github.com/rust-lang/cargo/pull/1568
9339 [pie]: https://github.com/rust-lang/rust/pull/24953
9340 [abs]: https://github.com/rust-lang/rust/pull/25441
9341 [c]: https://github.com/rust-lang/rust/pull/25496
9342 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9343 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9344 [inc]: https://github.com/rust-lang/rust/pull/25522
9345 [bh]: https://github.com/rust-lang/rust/pull/25856
9346 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9347 [ll]: https://github.com/rust-lang/rust/pull/26022
9348 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9349 [drop]: https://github.com/rust-lang/rust/pull/24935
9351 Version 1.0.0 (2015-05-15)
9352 ========================
9354 * ~1500 changes, numerous bugfixes
9359 * The vast majority of the standard library is now `#[stable]`. It is
9360 no longer possible to use unstable features with a stable build of
9362 * Many popular crates on [crates.io] now work on the stable release
9364 * Arithmetic on basic integer types now [checks for overflow in debug
9370 * Several [restrictions have been added to trait coherence][coh] in
9371 order to make it easier for upstream authors to change traits
9372 without breaking downstream code.
9373 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9374 improve error messages and macro behavior. For example, `0b1234` is
9375 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9376 * Trait bounds [are always invariant][inv], eliminating the need for
9377 the `PhantomFn` and `MarkerTrait` lang items, which have been
9379 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9380 "foo" as bar` syntax has been replaced with `extern crate foo as
9381 bar`, and Cargo now automatically translates "-" in *package* names
9382 to underscore for the crate name.
9383 * [Lifetime shadowing is an error][lt].
9384 * [`Send` no longer implies `'static`][send-rfc].
9385 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9386 `MyType::default()`.
9387 * Primitive types [now have inherent methods][prim-inherent],
9388 obviating the need for extension traits like `SliceExt`.
9389 * Methods with `Self: Sized` in their `where` clause are [considered
9390 object-safe][self-sized], allowing many extension traits like
9391 `IteratorExt` to be merged into the traits they extended.
9392 * You can now [refer to associated types][assoc-where] whose
9393 corresponding trait bounds appear only in a `where` clause.
9394 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9395 like `Send` and `Sync` are now library-defined.
9396 * A [Reflect trait][reflect] was introduced, which means that
9397 downcasting via the `Any` trait is effectively limited to concrete
9398 types. This helps retain the potentially-important "parametricity"
9399 property: generic code cannot behave differently for different type
9400 arguments except in minor ways.
9401 * The `unsafe_destructor` feature is now deprecated in favor of the
9402 [new `dropck`][dropck]. This change is a major reduction in unsafe
9408 * The `thread_local` module [has been renamed to `std::thread`][th].
9409 * The methods of `IteratorExt` [have been moved to the `Iterator`
9411 * Several traits that implement Rust's conventions for type
9412 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9413 [centralized in the `std::convert` module][con].
9414 * The `FromError` trait [was removed in favor of `From`][fe].
9415 * The basic sleep function [has moved to
9416 `std::thread::sleep_ms`][slp].
9417 * The `splitn` function now takes an `n` parameter that represents the
9418 number of items yielded by the returned iterator [instead of the
9419 number of 'splits'][spl].
9420 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9421 * [Derived implementations of `PartialOrd` now order enums according
9422 to their explicitly-assigned discriminants][po].
9423 * [Methods for searching strings are generic over `Pattern`s][pat],
9424 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9426 * [In method resolution, object methods are resolved before inherent
9428 * [`String::from_str` has been deprecated in favor of the `From` impl,
9429 `String::from`][sf].
9430 * [`io::Error` implements `Sync`][ios].
9431 * [The `words` method on `&str` has been replaced with
9432 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9434 * The new path and IO modules are complete and `#[stable]`. This
9435 was the major library focus for this cycle.
9436 * The path API was [revised][path-normalize] to normalize `.`,
9437 adjusting the tradeoffs in favor of the most common usage.
9438 * A large number of remaining APIs in `std` were also stabilized
9439 during this cycle; about 75% of the non-deprecated API surface
9441 * The new [string pattern API][string-pattern] landed, which makes
9442 the string slice API much more internally consistent and flexible.
9443 * A new set of [generic conversion traits][conversion] replaced
9444 many existing ad hoc traits.
9445 * Generic numeric traits were [completely removed][num-traits]. This
9446 was made possible thanks to inherent methods for primitive types,
9447 and the removal gives maximal flexibility for designing a numeric
9448 hierarchy in the future.
9449 * The `Fn` traits are now related via [inheritance][fn-inherit]
9450 and provide ergonomic [blanket implementations][fn-blanket].
9451 * The `Index` and `IndexMut` traits were changed to
9452 [take the index by value][index-value], enabling code like
9453 `hash_map["string"]` to work.
9454 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9455 `Copy` data is known to be `Clone` as well.
9460 * Many errors now have extended explanations that can be accessed with
9461 the `--explain` flag to `rustc`.
9462 * Many new examples have been added to the standard library
9464 * rustdoc has received a number of improvements focused on completion
9466 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9467 * Much headway was made on ecosystem-wide CI, making it possible
9468 to [compare builds for breakage][ci-compare].
9471 [crates.io]: http://crates.io
9472 [clo]: https://github.com/rust-lang/rust/pull/24034
9473 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9474 [con]: https://github.com/rust-lang/rust/pull/23875
9475 [cr]: https://github.com/rust-lang/rust/pull/23419
9476 [fe]: https://github.com/rust-lang/rust/pull/23879
9477 [ie]: https://github.com/rust-lang/rust/pull/23300
9478 [inv]: https://github.com/rust-lang/rust/pull/23938
9479 [ios]: https://github.com/rust-lang/rust/pull/24133
9480 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9481 [lt]: https://github.com/rust-lang/rust/pull/24057
9482 [meth]: https://github.com/rust-lang/rust/pull/24056
9483 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9484 [po]: https://github.com/rust-lang/rust/pull/24270
9485 [sf]: https://github.com/rust-lang/rust/pull/24517
9486 [slp]: https://github.com/rust-lang/rust/pull/23949
9487 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9488 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9489 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9490 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9491 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9492 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9493 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9494 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9495 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9496 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9497 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9498 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9499 [reflect]: https://github.com/rust-lang/rust/pull/23712
9500 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9501 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9502 [index-value]: https://github.com/rust-lang/rust/pull/23601
9503 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9504 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9505 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9506 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9507 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9508 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9511 Version 1.0.0-alpha.2 (2015-02-20)
9512 =====================================
9514 * ~1300 changes, numerous bugfixes
9518 * The various I/O modules were [overhauled][io-rfc] to reduce
9519 unnecessary abstractions and provide better interoperation with
9520 the underlying platform. The old `io` module remains temporarily
9522 * The standard library now [participates in feature gating][feat],
9523 so use of unstable libraries now requires a `#![feature(...)]`
9524 attribute. The impact of this change is [described on the
9525 forum][feat-forum]. [RFC][feat-rfc].
9529 * `for` loops [now operate on the `IntoIterator` trait][into],
9530 which eliminates the need to call `.iter()`, etc. to iterate
9531 over collections. There are some new subtleties to remember
9532 though regarding what sort of iterators various types yield, in
9533 particular that `for foo in bar { }` yields values from a move
9534 iterator, destroying the original collection. [RFC][into-rfc].
9535 * Objects now have [default lifetime bounds][obj], so you don't
9536 have to write `Box<Trait+'static>` when you don't care about
9537 storing references. [RFC][obj-rfc].
9538 * In types that implement `Drop`, [lifetimes must outlive the
9539 value][drop]. This will soon make it possible to safely
9540 implement `Drop` for types where `#[unsafe_destructor]` is now
9541 required. Read the [gorgeous RFC][drop-rfc] for details.
9542 * The fully qualified <T as Trait>::X syntax lets you set the Self
9543 type for a trait method or associated type. [RFC][ufcs-rfc].
9544 * References to types that implement `Deref<U>` now [automatically
9545 coerce to references][deref] to the dereferenced type `U`,
9546 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9547 should eliminate many unsightly uses of `&*`, as when converting
9548 from references to vectors into references to
9549 slices. [RFC][deref-rfc].
9550 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9551 `|:|`) is obsolete and closure kind is inferred from context.
9552 * [`Self` is a keyword][Self].
9556 * The `Show` and `String` formatting traits [have been
9557 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9558 their related purposes. Automatically getting a string
9559 conversion to use with `format!("{:?}", something_to_debug)` is
9560 now written `#[derive(Debug)]`.
9561 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9562 OsStr}`, provide strings in platform-specific encodings for easier
9563 interop with system APIs. [RFC][osstr-rfc].
9564 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9565 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9566 creating raw pointers.
9570 * Certain long error messages of the form 'expected foo found bar'
9571 are now [split neatly across multiple
9572 lines][multiline]. Examples in the PR.
9573 * On Unix Rust can be [uninstalled][un] by running
9574 `/usr/local/lib/rustlib/uninstall.sh`.
9575 * The `#[rustc_on_unimplemented]` attribute, requiring the
9576 'on_unimplemented' feature, lets rustc [display custom error
9577 messages when a trait is expected to be implemented for a type
9582 * Rust is tested against a [LALR grammar][lalr], which parses
9583 almost all the Rust files that rustc does.
9585 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9586 [close]: https://github.com/rust-lang/rust/pull/21843
9587 [deref]: https://github.com/rust-lang/rust/pull/21351
9588 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9589 [drop]: https://github.com/rust-lang/rust/pull/21972
9590 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9591 [feat]: https://github.com/rust-lang/rust/pull/21248
9592 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9593 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9594 [fmt]: https://github.com/rust-lang/rust/pull/21457
9595 [into]: https://github.com/rust-lang/rust/pull/20790
9596 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9597 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9598 [lalr]: https://github.com/rust-lang/rust/pull/21452
9599 [multiline]: https://github.com/rust-lang/rust/pull/19870
9600 [obj]: https://github.com/rust-lang/rust/pull/22230
9601 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9602 [onun]: https://github.com/rust-lang/rust/pull/20889
9603 [osstr]: https://github.com/rust-lang/rust/pull/21488
9604 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9605 [Self]: https://github.com/rust-lang/rust/pull/22158
9606 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9607 [un]: https://github.com/rust-lang/rust/pull/22256
9610 Version 1.0.0-alpha (2015-01-09)
9611 ==================================
9613 * ~2400 changes, numerous bugfixes
9617 * The language itself is considered feature complete for 1.0,
9618 though there will be many usability improvements and bugfixes
9619 before the final release.
9620 * Nearly 50% of the public API surface of the standard library has
9621 been declared 'stable'. Those interfaces are unlikely to change
9623 * The long-running debate over integer types has been
9624 [settled][ints]: Rust will ship with types named `isize` and
9625 `usize`, rather than `int` and `uint`, for pointer-sized
9626 integers. Guidelines will be rolled out during the alpha cycle.
9627 * Most crates that are not `std` have been moved out of the Rust
9628 distribution into the Cargo ecosystem so they can evolve
9629 separately and don't need to be stabilized as quickly, including
9630 'time', 'getopts', 'num', 'regex', and 'term'.
9631 * Documentation continues to be expanded with more API coverage, more
9632 examples, and more in-depth explanations. The guides have been
9633 consolidated into [The Rust Programming Language][trpl].
9634 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9635 * All official Rust binary installers now come with [Cargo], the
9636 Rust package manager.
9640 * Closures have been [completely redesigned][unboxed] to be
9641 implemented in terms of traits, can now be used as generic type
9642 bounds and thus monomorphized and inlined, or via an opaque
9643 pointer (boxed) as in the old system. The new system is often
9644 referred to as 'unboxed' closures.
9645 * Traits now support [associated types][assoc], allowing families
9646 of related types to be defined together and used generically in
9648 * Enum variants are [namespaced by their type names][enum].
9649 * [`where` clauses][where] provide a more versatile and attractive
9650 syntax for specifying generic bounds, though the previous syntax
9652 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9654 * Rust [no longer has a runtime][rt] of any description, and only
9655 supports OS threads, not green threads.
9656 * At long last, Rust has been overhauled for 'dynamically-sized
9657 types' ([DST]), which integrates 'fat pointers' (object types,
9658 arrays, and `str`) more deeply into the type system, making it
9660 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9661 `..j` that produce range types and which, when combined with the
9662 `Index` operator and multidispatch, leads to a convenient slice
9664 * The new range syntax revealed an ambiguity in the fixed-length
9665 array syntax, so now fixed length arrays [are written `[T;
9667 * The `Copy` trait is no longer implemented automatically. Unsafe
9668 pointers no longer implement `Sync` and `Send` so types
9669 containing them don't automatically either. `Sync` and `Send`
9670 are now 'unsafe traits' so one can "forcibly" implement them via
9671 `unsafe impl` if a type confirms to the requirements for them
9672 even though the internals do not (e.g. structs containing unsafe
9673 pointers like `Arc`). These changes are intended to prevent some
9674 footguns and are collectively known as [opt-in built-in
9675 traits][oibit] (though `Sync` and `Send` will soon become pure
9676 library types unknown to the compiler).
9677 * Operator traits now take their operands [by value][ops], and
9678 comparison traits can use multidispatch to compare one type
9679 against multiple other types, allowing e.g. `String` to be
9680 compared with `&str`.
9681 * `if let` and `while let` are no longer feature-gated.
9682 * Rust has adopted a more [uniform syntax for escaping unicode
9683 characters][unicode].
9684 * `macro_rules!` [has been declared stable][mac]. Though it is a
9685 flawed system it is sufficiently popular that it must be usable
9686 for 1.0. Effort has gone into [future-proofing][mac-future] it
9687 in ways that will allow other macro systems to be developed in
9688 parallel, and won't otherwise impact the evolution of the
9690 * The prelude has been [pared back significantly][prelude] such
9691 that it is the minimum necessary to support the most pervasive
9692 code patterns, and through [generalized where clauses][where]
9693 many of the prelude extension traits have been consolidated.
9694 * Rust's rudimentary reflection [has been removed][refl], as it
9695 incurred too much code generation for little benefit.
9696 * [Struct variants][structvars] are no longer feature-gated.
9697 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9698 known as 'higher-ranked trait bounds', this crucially allows
9699 unboxed closures to work.
9700 * Macros invocations surrounded by parens or square brackets and
9701 not terminated by a semicolon are [parsed as
9702 expressions][macros], which makes expressions like `vec![1i32,
9703 2, 3].len()` work as expected.
9704 * Trait objects now implement their traits automatically, and
9705 traits that can be coerced to objects now must be [object
9707 * Automatically deriving traits is now done with `#[derive(...)]`
9708 not `#[deriving(...)]` for [consistency with other naming
9709 conventions][derive].
9710 * Importing the containing module or enum at the same time as
9711 items or variants they contain is [now done with `self` instead
9712 of `mod`][self], as in use `foo::{self, bar}`
9713 * Glob imports are no longer feature-gated.
9714 * The `box` operator and `box` patterns have been feature-gated
9715 pending a redesign. For now unique boxes should be allocated
9716 like other containers, with `Box::new`.
9720 * A [series][coll1] of [efforts][coll2] to establish
9721 [conventions][coll3] for collections types has resulted in API
9722 improvements throughout the standard library.
9723 * New [APIs for error handling][err] provide ergonomic interop
9724 between error types, and [new conventions][err-conv] describe
9725 more clearly the recommended error handling strategies in Rust.
9726 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9727 it is easier to discuss failure in the context of error handling
9728 without making clarifications as to whether you are referring to
9729 the 'fail' macro or failure more generally.
9730 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9731 syscall when available.
9732 * The 'serialize' crate has been renamed 'rustc-serialize' and
9733 moved out of the distribution to Cargo. Although it is widely
9734 used now, it is expected to be superseded in the near future.
9735 * The `Show` formatter, typically implemented with
9736 `#[derive(Show)]` is [now requested with the `{:?}`
9737 specifier][show] and is intended for use by all types, for uses
9738 such as `println!` debugging. The new `String` formatter must be
9739 implemented by hand, uses the `{}` specifier, and is intended
9740 for full-fidelity conversions of things that can logically be
9741 represented as strings.
9745 * [Flexible target specification][flex] allows rustc's code
9746 generation to be configured to support otherwise-unsupported
9748 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9749 respective debuggers with Rust-appropriate pretty-printing.
9750 * The Windows installation of Rust is distributed with the
9751 MinGW components currently required to link binaries on that
9756 * Nullable enum optimizations have been extended to more types so
9757 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9758 space than the inner types themselves.
9759 * Work has begun on supporting AArch64.
9761 [Cargo]: https://crates.io
9762 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9763 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9764 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9765 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9766 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9767 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9768 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9769 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9770 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9771 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9772 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9773 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9774 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9775 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9776 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9777 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9778 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9779 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9780 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9781 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9782 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9783 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9784 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9785 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9786 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9787 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9788 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9789 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9790 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9791 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9792 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9793 [trpl]: https://doc.rust-lang.org/book/index.html
9794 [rbe]: http://rustbyexample.com/
9797 Version 0.12.0 (2014-10-09)
9798 =============================
9800 * ~1900 changes, numerous bugfixes
9804 * The introductory documentation (now called The Rust Guide) has
9805 been completely rewritten, as have a number of supplementary
9807 * Rust's package manager, Cargo, continues to improve and is
9808 sometimes considered to be quite awesome.
9809 * Many API's in `std` have been reviewed and updated for
9810 consistency with the in-development Rust coding
9811 guidelines. The standard library documentation tracks
9812 stabilization progress.
9813 * Minor libraries have been moved out-of-tree to the rust-lang org
9814 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9815 be installed with Cargo.
9816 * Lifetime elision allows lifetime annotations to be left off of
9817 function declarations in many common scenarios.
9818 * Rust now works on 64-bit Windows.
9821 * Indexing can be overloaded with the `Index` and `IndexMut`
9823 * The `if let` construct takes a branch only if the `let` pattern
9824 matches, currently behind the 'if_let' feature gate.
9825 * 'where clauses', a more flexible syntax for specifying trait
9826 bounds that is more aesthetic, have been added for traits and
9827 free functions. Where clauses will in the future make it
9828 possible to constrain associated types, which would be
9829 impossible with the existing syntax.
9830 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9831 the 'slicing_syntax' feature gate, and can be overloaded with
9832 the `Slice` or `SliceMut` traits.
9833 * The syntax for matching of sub-slices has been changed to use a
9834 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9835 consistency with other uses of `..` and to future-proof
9836 potential additional uses of the syntax.
9837 * The syntax for matching inclusive ranges in patterns has changed
9838 from `0..3` to `0...4` to be consistent with the exclusive range
9840 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9841 c]`) has been put behind the 'advanced_slice_patterns' feature
9842 gate and may be removed in the future.
9843 * Components of tuples and tuple structs can be extracted using
9844 the `value.0` syntax, currently behind the `tuple_indexing`
9846 * The `#[crate_id]` attribute is no longer supported; versioning
9847 is handled by the package manager.
9848 * Renaming crate imports are now written `extern crate foo as bar`
9849 instead of `extern crate bar = foo`.
9850 * Renaming use statements are now written `use foo as bar` instead
9852 * `let` and `match` bindings and argument names in macros are now
9854 * The new, more efficient, closure types ('unboxed closures') have
9855 been added under a feature gate, 'unboxed_closures'. These will
9856 soon replace the existing closure types, once higher-ranked
9857 trait lifetimes are added to the language.
9858 * `move` has been added as a keyword, for indicating closures
9859 that capture by value.
9860 * Mutation and assignment is no longer allowed in pattern guards.
9861 * Generic structs and enums can now have trait bounds.
9862 * The `Share` trait is now called `Sync` to free up the term
9863 'shared' to refer to 'shared reference' (the default reference
9865 * Dynamically-sized types have been mostly implemented,
9866 unifying the behavior of fat-pointer types with the rest of the
9868 * As part of dynamically-sized types, the `Sized` trait has been
9869 introduced, which qualifying types implement by default, and
9870 which type parameters expect by default. To specify that a type
9871 parameter does not need to be sized, write `<Sized? T>`. Most
9872 types are `Sized`, notable exceptions being unsized arrays
9873 (`[T]`) and trait types.
9874 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9875 * Lifetime bounds can now be applied to type parameters and object
9877 * The old, reference counted GC type, `Gc<T>` which was once
9878 denoted by the `@` sigil, has finally been removed. GC will be
9879 revisited in the future.
9882 * Library documentation has been improved for a number of modules.
9883 * Bit-vectors, collections::bitv has been modernized.
9884 * The url crate is deprecated in favor of
9885 http://github.com/servo/rust-url, which can be installed with
9887 * Most I/O stream types can be cloned and subsequently closed from
9889 * A `std::time::Duration` type has been added for use in I/O
9890 methods that rely on timers, as well as in the 'time' crate's
9891 `Timespec` arithmetic.
9892 * The runtime I/O abstraction layer that enabled the green thread
9893 scheduler to do non-thread-blocking I/O has been removed, along
9894 with the libuv-based implementation employed by the green thread
9895 scheduler. This will greatly simplify the future I/O work.
9896 * `collections::btree` has been rewritten to have a more
9897 idiomatic and efficient design.
9900 * rustdoc output now indicates the stability levels of API's.
9901 * The `--crate-name` flag can specify the name of the crate
9902 being compiled, like `#[crate_name]`.
9903 * The `-C metadata` specifies additional metadata to hash into
9904 symbol names, and `-C extra-filename` specifies additional
9905 information to put into the output filename, for use by the
9906 package manager for versioning.
9907 * debug info generation has continued to improve and should be
9908 more reliable under both gdb and lldb.
9909 * rustc has experimental support for compiling in parallel
9910 using the `-C codegen-units` flag.
9911 * rustc no longer encodes rpath information into binaries by
9915 * Stack usage has been optimized with LLVM lifetime annotations.
9916 * Official Rust binaries on Linux are more compatible with older
9917 kernels and distributions, built on CentOS 5.10.
9920 Version 0.11.0 (2014-07-02)
9921 ==========================
9923 * ~1700 changes, numerous bugfixes
9926 * ~[T] has been removed from the language. This type is superseded by
9928 * ~str has been removed from the language. This type is superseded by
9930 * ~T has been removed from the language. This type is superseded by the
9932 * @T has been removed from the language. This type is superseded by the
9933 standard library's std::gc::Gc<T> type.
9934 * Struct fields are now all private by default.
9935 * Vector indices and shift amounts are both required to be a `uint`
9936 instead of any integral type.
9937 * Byte character, byte string, and raw byte string literals are now all
9938 supported by prefixing the normal literal with a `b`.
9939 * Multiple ABIs are no longer allowed in an ABI string
9940 * The syntax for lifetimes on closures/procedures has been tweaked
9941 slightly: `<'a>|A, B|: 'b + K -> T`
9942 * Floating point modulus has been removed from the language; however it
9943 is still provided by a library implementation.
9944 * Private enum variants are now disallowed.
9945 * The `priv` keyword has been removed from the language.
9946 * A closure can no longer be invoked through a &-pointer.
9947 * The `use foo, bar, baz;` syntax has been removed from the language.
9948 * The transmute intrinsic no longer works on type parameters.
9949 * Statics now allow blocks/items in their definition.
9950 * Trait bounds are separated from objects with + instead of : now.
9951 * Objects can no longer be read while they are mutably borrowed.
9952 * The address of a static is now marked as insignificant unless the
9953 #[inline(never)] attribute is placed it.
9954 * The #[unsafe_destructor] attribute is now behind a feature gate.
9955 * Struct literals are no longer allowed in ambiguous positions such as
9956 if, while, match, and for..in.
9957 * Declaration of lang items and intrinsics are now feature-gated by
9959 * Integral literals no longer default to `int`, and floating point
9960 literals no longer default to `f64`. Literals must be suffixed with an
9961 appropriate type if inference cannot determine the type of the
9963 * The Box<T> type is no longer implicitly borrowed to &mut T.
9964 * Procedures are now required to not capture borrowed references.
9967 * The standard library is now a "facade" over a number of underlying
9968 libraries. This means that development on the standard library should
9969 be speedier due to smaller crates, as well as a clearer line between
9971 * A new library, libcore, lives under the standard library's facade
9972 which is Rust's "0-assumption" library, suitable for embedded and
9973 kernel development for example.
9974 * A regex crate has been added to the standard distribution. This crate
9975 includes statically compiled regular expressions.
9976 * The unwrap/unwrap_err methods on Result require a Show bound for
9977 better error messages.
9978 * The return types of the std::comm primitives have been centralized
9979 around the Result type.
9980 * A number of I/O primitives have gained the ability to time out their
9982 * A number of I/O primitives have gained the ability to close their
9983 reading/writing halves to cancel pending operations.
9984 * Reverse iterator methods have been removed in favor of `rev()` on
9985 their forward-iteration counterparts.
9986 * A bitflags! macro has been added to enable easy interop with C and
9987 management of bit flags.
9988 * A debug_assert! macro is now provided which is disabled when
9989 `--cfg ndebug` is passed to the compiler.
9990 * A graphviz crate has been added for creating .dot files.
9991 * The std::cast module has been migrated into std::mem.
9992 * The std::local_data api has been migrated from freestanding functions
9993 to being based on methods.
9994 * The Pod trait has been renamed to Copy.
9995 * jemalloc has been added as the default allocator for types.
9996 * The API for allocating memory has been changed to use proper alignment
9997 and sized deallocation
9998 * Connecting a TcpStream or binding a TcpListener is now based on a
9999 string address and a u16 port. This allows connecting to a hostname as
10001 * The Reader trait now contains a core method, read_at_least(), which
10002 correctly handles many repeated 0-length reads.
10003 * The process-spawning API is now centered around a builder-style
10005 * The :? printing qualifier has been moved from the standard library to
10006 an external libdebug crate.
10007 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10008 have been renamed to Eq/Ord.
10009 * The select/plural methods have been removed from format!. The escapes
10010 for { and } have also changed from \{ and \} to {{ and }},
10012 * The TaskBuilder API has been re-worked to be a true builder, and
10013 extension traits for spawning native/green tasks have been added.
10016 * All breaking changes to the language or libraries now have their
10017 commit message annotated with `[breaking-change]` to allow for easy
10018 discovery of breaking changes.
10019 * The compiler will now try to suggest how to annotate lifetimes if a
10020 lifetime-related error occurs.
10021 * Debug info continues to be improved greatly with general bug fixes and
10022 better support for situations like link time optimization (LTO).
10023 * Usage of syntax extensions when cross-compiling has been fixed.
10024 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10025 -fdata-sections and --gc-sections has been enabled by default
10026 * The compiler is now stricter about where it will load module files
10027 from when a module is declared via `mod foo;`.
10028 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10029 Syntax extensions are now discovered via a "plugin registrar" type
10030 which will be extended in the future to other various plugins.
10031 * Lints have been restructured to allow for dynamically loadable lints.
10032 * A number of rustdoc improvements:
10033 * The HTML output has been visually redesigned.
10034 * Markdown is now powered by hoedown instead of sundown.
10035 * Searching heuristics have been greatly improved.
10036 * The search index has been reduced in size by a great amount.
10037 * Cross-crate documentation via `pub use` has been greatly improved.
10038 * Primitive types are now hyperlinked and documented.
10039 * Documentation has been moved from static.rust-lang.org/doc to
10041 * A new sandbox, play.rust-lang.org, is available for running and
10042 sharing rust code examples on-line.
10043 * Unused attributes are now more robustly warned about.
10044 * The dead_code lint now warns about unused struct fields.
10045 * Cross-compiling to iOS is now supported.
10046 * Cross-compiling to mipsel is now supported.
10047 * Stability attributes are now inherited by default and no longer apply
10048 to intra-crate usage, only inter-crate usage.
10049 * Error message related to non-exhaustive match expressions have been
10053 Version 0.10 (2014-04-03)
10054 =========================
10056 * ~1500 changes, numerous bugfixes
10059 * A new RFC process is now in place for modifying the language.
10060 * Patterns with `@`-pointers have been removed from the language.
10061 * Patterns with unique vectors (`~[T]`) have been removed from the
10063 * Patterns with unique strings (`~str`) have been removed from the
10065 * `@str` has been removed from the language.
10066 * `@[T]` has been removed from the language.
10067 * `@self` has been removed from the language.
10068 * `@Trait` has been removed from the language.
10069 * Headers on `~` allocations which contain `@` boxes inside the type for
10070 reference counting have been removed.
10071 * The semantics around the lifetimes of temporary expressions have changed,
10072 see #3511 and #11585 for more information.
10073 * Cross-crate syntax extensions are now possible, but feature gated. See
10074 #11151 for more information. This includes both `macro_rules!` macros as
10075 well as syntax extensions such as `format!`.
10076 * New lint modes have been added, and older ones have been turned on to be
10078 * Unnecessary parentheses
10079 * Uppercase statics
10081 * Uppercase variables
10082 * Publicly visible private types
10083 * `#[deriving]` with raw pointers
10084 * Unsafe functions can no longer be coerced to closures.
10085 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10086 * The `#[simd]` attribute is now behind a feature gate.
10087 * Visibility is no longer allowed on `extern crate` statements, and
10088 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10089 * Trailing commas are now allowed in argument lists and tuple patterns.
10090 * The `do` keyword has been removed, it is now a reserved keyword.
10091 * Default type parameters have been implemented, but are feature gated.
10092 * Borrowed variables through captures in closures are now considered soundly.
10093 * `extern mod` is now `extern crate`
10094 * The `Freeze` trait has been removed.
10095 * The `Share` trait has been added for types that can be shared among
10097 * Labels in macros are now hygienic.
10098 * Expression/statement macro invocations can be delimited with `{}` now.
10099 * Treatment of types allowed in `static mut` locations has been tweaked.
10100 * The `*` and `.` operators are now overloadable through the `Deref` and
10102 * `~Trait` and `proc` no longer have `Send` bounds by default.
10103 * Partial type hints are now supported with the `_` type marker.
10104 * An `Unsafe` type was introduced for interior mutability. It is now
10105 considered undefined to transmute from `&T` to `&mut T` without using the
10107 * The #[linkage] attribute was implemented for extern statics/functions.
10108 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10109 * `Pod` was renamed to `Copy`.
10112 * The `libextra` library has been removed. It has now been decomposed into
10113 component libraries with smaller and more focused nuggets of
10114 functionality. The full list of libraries can be found on the
10115 documentation index page.
10116 * std: `std::condition` has been removed. All I/O errors are now propagated
10117 through the `Result` type. In order to assist with error handling, a
10118 `try!` macro for unwrapping errors with an early return and a lint for
10119 unused results has been added. See #12039 for more information.
10120 * std: The `vec` module has been renamed to `slice`.
10121 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10122 This will become the only growable vector in the future.
10123 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10124 are now found at `std::io::BufferedReader` instead of
10125 `std::io::buffered::BufferedReader`.
10126 * std: `print` and `println` are no longer in the prelude, the `print!` and
10127 `println!` macros are intended to be used instead.
10128 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10129 attempts to statically prevent cycles.
10130 * std: The standard distribution is adopting the policy of pushing failure
10131 to the user rather than failing in libraries. Many functions (such as
10132 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10133 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10134 deriving mode: `#[deriving(Show)]`.
10135 * std: `ToStr` is now implemented for all types implementing `Show`.
10136 * std: The formatting trait methods now take `&self` instead of `&T`
10137 * std: The `invert()` method on iterators has been renamed to `rev()`
10138 * std: `std::num` has seen a reduction in the genericity of its traits,
10139 consolidating functionality into a few core traits.
10140 * std: Backtraces are now printed on task failure if the environment
10141 variable `RUST_BACKTRACE` is present.
10142 * std: Naming conventions for iterators have been standardized. More details
10143 can be found on the wiki's style guide.
10144 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10145 still implement the function.
10146 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10147 * std: `assert_approx_eq!` has been removed
10148 * std: The `e` and `E` formatting specifiers for floats have been added to
10149 print them in exponential notation.
10150 * std: The `Times` trait has been removed
10151 * std: Indications of variance and opting out of builtin bounds is done
10152 through marker types in `std::kinds::marker` now
10153 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10154 `#[deriving(Hash)]` is now possible.
10155 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10156 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10157 * std: `Chan::new` is now `channel()`.
10158 * std: A new synchronous channel type has been implemented.
10159 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10160 * std: `hashmap` and `trie` have been moved to `libcollections`
10161 * std: `run` has been rolled into `io::process`
10162 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10163 * std: The equality and comparison traits have seen some reorganization.
10164 * std: `rand` has moved to `librand`.
10165 * std: `to_{lower,upper}case` has been implemented for `char`.
10166 * std: Logging has been moved to `liblog`.
10167 * collections: `HashMap` has been rewritten for higher performance and less
10169 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10170 it can be booted manually. The runtime guide has more information and
10172 * native: All I/O functionality except signals has been implemented.
10173 * green: Task spawning with `libgreen` has been optimized with stack caching
10174 and various trimming of code.
10175 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10176 * sync: The `extra::sync` module has been updated to modern rust (and moved
10177 to the `sync` library), tweaking and improving various interfaces while
10178 dropping redundant functionality.
10179 * sync: A new `Barrier` type has been added to the `sync` library.
10180 * sync: An efficient mutex for native and green tasks has been implemented.
10181 * serialize: The `base64` module has seen some improvement. It treats
10182 newlines better, has non-string error values, and has seen general
10184 * fourcc: A `fourcc!` macro was introduced
10185 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10186 hexadecimal literal.
10189 * `rustpkg` has been deprecated and removed from the main repository. Its
10190 replacement, `cargo`, is under development.
10191 * Nightly builds of rust are now available
10192 * The memory usage of rustc has been improved many times throughout this
10194 * The build process supports disabling rpath support for the rustc binary
10196 * Code generation has improved in some cases, giving more information to the
10197 LLVM optimization passes to enable more extensive optimizations.
10198 * Debuginfo compatibility with lldb on OSX has been restored.
10199 * The master branch is now gated on an android bot, making building for
10200 android much more reliable.
10201 * Output flags have been centralized into one `--emit` flag.
10202 * Crate type flags have been centralized into one `--crate-type` flag.
10203 * Codegen flags have been consolidated behind a `-C` flag.
10204 * Linking against outdated crates now has improved error messages.
10205 * Error messages with lifetimes will often suggest how to annotate the
10206 function to fix the error.
10207 * Many more types are documented in the standard library, and new guides
10209 * Many `rustdoc` improvements:
10210 * code blocks are syntax highlighted.
10211 * render standalone markdown files.
10212 * the --test flag tests all code blocks by default.
10213 * exported macros are displayed.
10214 * re-exported types have their documentation inlined at the location of the
10216 * search works across crates that have been rendered to the same output
10220 Version 0.9 (2014-01-09)
10221 ==========================
10223 * ~1800 changes, numerous bugfixes
10226 * The `float` type has been removed. Use `f32` or `f64` instead.
10227 * A new facility for enabling experimental features (feature gating) has
10228 been added, using the crate-level `#[feature(foo)]` attribute.
10229 * Managed boxes (@) are now behind a feature gate
10230 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10231 standard library's `Gc` or `Rc` types instead.
10232 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10233 * Jumping back to the top of a loop is now done with `continue` instead of
10235 * Strings can no longer be mutated through index assignment.
10236 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10237 hash delimiters, as in `r###"foo"###`.
10238 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10240 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10241 * `@fn`s have been removed.
10242 * `do` only works with procs in order to make it obvious what the cost
10244 * Single-element tuple-like structs can no longer be dereferenced to
10245 obtain the inner value. A more comprehensive solution for overloading
10246 the dereference operator will be provided in the future.
10247 * The `#[link(...)]` attribute has been replaced with
10248 `#[crate_id = "name#vers"]`.
10249 * Empty `impl`s must be terminated with empty braces and may not be
10250 terminated with a semicolon.
10251 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10252 no longer has any special meaning.
10253 * The old `fmt!` string formatting macro has been removed.
10254 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10255 `print!` and `println!`.
10256 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10257 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10258 `extern mod foo = "bar"` instead.
10259 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10260 * Macros can have attributes.
10261 * Macros can expand to items with attributes.
10262 * Macros can expand to multiple items.
10263 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10264 * Comments may be nested.
10265 * Values automatically coerce to trait objects they implement, without
10267 * Enum discriminants are no longer an entire word but as small as needed to
10268 contain all the variants. The `repr` attribute can be used to override
10269 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10270 `#[repr(C)]` to match C enums.
10271 * Non-string literals are not allowed in attributes (they never worked).
10272 * The FFI now supports variadic functions.
10273 * Octal numeric literals, as in `0o7777`.
10274 * The `concat!` syntax extension performs compile-time string concatenation.
10275 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10276 removed as Rust no longer uses segmented stacks.
10277 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10278 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10279 not `*`; ignoring remaining fields of a struct is also done with `..`,
10280 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10281 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10282 * `rustc` supports the "system" calling convention, which defaults to the
10283 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10285 * The `type_overflow` lint (default: warn) checks literals for overflow.
10286 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10287 * The `attribute_usage` lint (default: warn) warns about unknown
10289 * The `unknown_features` lint (default: warn) warns about unknown
10291 * The `dead_code` lint (default: warn) checks for dead code.
10292 * Rust libraries can be linked statically to one another
10293 * `#[link_args]` is behind the `link_args` feature gate.
10294 * Native libraries are now linked with `#[link(name = "foo")]`
10295 * Native libraries can be statically linked to a rust crate
10296 (`#[link(name = "foo", kind = "static")]`).
10297 * Native OS X frameworks are now officially supported
10298 (`#[link(name = "foo", kind = "framework")]`).
10299 * The `#[thread_local]` attribute creates thread-local (not task-local)
10300 variables. Currently behind the `thread_local` feature gate.
10301 * The `return` keyword may be used in closures.
10302 * Types that can be copied via a memcpy implement the `Pod` kind.
10303 * The `cfg` attribute can now be used on struct fields and enum variants.
10306 * std: The `option` and `result` API's have been overhauled to make them
10307 simpler, more consistent, and more composable.
10308 * std: The entire `std::io` module has been replaced with one that is
10309 more comprehensive and that properly interfaces with the underlying
10310 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10312 * std: `io::util` contains a number of useful implementations of
10313 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10314 `ZeroReader`, `TeeReader`.
10315 * std: The reference counted pointer type `extra::rc` moved into std.
10316 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10317 just a wrapper around it).
10318 * std: The `Either` type has been removed.
10319 * std: `fmt::Default` can be implemented for any type to provide default
10320 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10321 * std: The `rand` API continues to be tweaked.
10322 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10323 on failure in gdb, is now named `rust_fail`.
10324 * std: The `each_key` and `each_value` methods on `HashMap` have been
10325 replaced by the `keys` and `values` iterators.
10326 * std: Functions dealing with type size and alignment have moved from the
10327 `sys` module to the `mem` module.
10328 * std: The `path` module was written and API changed.
10329 * std: `str::from_utf8` has been changed to cast instead of allocate.
10330 * std: `starts_with` and `ends_with` methods added to vectors via the
10331 `ImmutableEqVector` trait, which is in the prelude.
10332 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10333 if the index is out of bounds.
10334 * std: Task failure no longer propagates between tasks, as the model was
10335 complex, expensive, and incompatible with thread-based tasks.
10336 * std: The `Any` type can be used for dynamic typing.
10337 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10339 * std: Methods that produce iterators generally do not have an `_iter`
10341 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10342 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10343 * std: `util::ignore` renamed to `prelude::drop`.
10344 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10346 * std: `vec::raw` has seen a lot of cleanup and API changes.
10347 * std: The standard library no longer includes any C++ code, and very
10348 minimal C, eliminating the dependency on libstdc++.
10349 * std: Runtime scheduling and I/O functionality has been factored out into
10350 extensible interfaces and is now implemented by two different crates:
10351 libnative, for native threading and I/O; and libgreen, for green threading
10352 and I/O. This paves the way for using the standard library in more limited
10353 embedded environments.
10354 * std: The `comm` module has been rewritten to be much faster, have a
10355 simpler, more consistent API, and to work for both native and green
10357 * std: All libuv dependencies have been moved into the rustuv crate.
10358 * native: New implementations of runtime scheduling on top of OS threads.
10359 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10361 * green: The green thread scheduler and message passing types are almost
10362 entirely lock-free.
10363 * extra: The `flatpipes` module had bitrotted and was removed.
10364 * extra: All crypto functions have been removed and Rust now has a policy of
10365 not reimplementing crypto in the standard library. In the future crypto
10366 will be provided by external crates with bindings to established libraries.
10367 * extra: `c_vec` has been modernized.
10368 * extra: The `sort` module has been removed. Use the `sort` method on
10372 * The `rust` and `rusti` commands have been removed, due to lack of
10374 * `rustdoc` was completely rewritten.
10375 * `rustdoc` can test code examples in documentation.
10376 * `rustpkg` can test packages with the argument, 'test'.
10377 * `rustpkg` supports arbitrary dependencies, including C libraries.
10378 * `rustc`'s support for generating debug info is improved again.
10379 * `rustc` has better error reporting for unbalanced delimiters.
10380 * `rustc`'s JIT support was removed due to bitrot.
10381 * Executables and static libraries can be built with LTO (-Z lto)
10382 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10386 Version 0.8 (2013-09-26)
10387 ============================
10389 * ~2200 changes, numerous bugfixes
10392 * The `for` loop syntax has changed to work with the `Iterator` trait.
10393 * At long last, unwinding works on Windows.
10394 * Default methods are ready for use.
10395 * Many trait inheritance bugs fixed.
10396 * Owned and borrowed trait objects work more reliably.
10397 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10398 * rustc can omit emission of code for the `debug!` macro if it is passed
10400 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10401 for foo.rs, then foo/mod.rs, and will generate an error when both are
10403 * Strings no longer contain trailing nulls. The new `std::c_str` module
10404 provides new mechanisms for converting to C strings.
10405 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10406 * The FFI has been overhauled such that foreign functions are called directly,
10407 instead of through a stack-switching wrapper.
10408 * Calling a foreign function must be done through a Rust function with the
10409 `#[fixed_stack_segment]` attribute.
10410 * The `externfn!` macro can be used to declare both a foreign function and
10411 a `#[fixed_stack_segment]` wrapper at once.
10412 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10413 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10414 * `priv` is disallowed everywhere except for struct fields and enum variants.
10415 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10416 * `ref` bindings in irrefutable patterns work correctly now.
10417 * `char` is now prevented from containing invalid code points.
10418 * Casting to `bool` is no longer allowed.
10419 * `\0` is now accepted as an escape in chars and strings.
10420 * `yield` is a reserved keyword.
10421 * `typeof` is a reserved keyword.
10422 * Crates may be imported by URL with `extern mod foo = "url";`.
10423 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10424 * Static vectors can be initialized with repeating elements,
10425 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10426 * Static structs can be initialized with functional record update,
10427 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10428 * `cfg!` can be used to conditionally execute code based on the crate
10429 configuration, similarly to `#[cfg(...)]`.
10430 * The `unnecessary_qualification` lint detects unneeded module
10431 prefixes (default: allow).
10432 * Arithmetic operations have been implemented on the SIMD types in
10433 `std::unstable::simd`.
10434 * Exchange allocation headers were removed, reducing memory usage.
10435 * `format!` implements a completely new, extensible, and higher-performance
10436 string formatting system. It will replace `fmt!`.
10437 * `print!` and `println!` write formatted strings (using the `format!`
10438 extension) to stdout.
10439 * `write!` and `writeln!` write formatted strings (using the `format!`
10440 extension) to the new Writers in `std::rt::io`.
10441 * The library section in which a function or static is placed may
10442 be specified with `#[link_section = "..."]`.
10443 * The `proto!` syntax extension for defining bounded message protocols
10445 * `macro_rules!` is hygienic for `let` declarations.
10446 * The `#[export_name]` attribute specifies the name of a symbol.
10447 * `unreachable!` can be used to indicate unreachable code, and fails
10451 * std: Transitioned to the new runtime, written in Rust.
10452 * std: Added an experimental I/O library, `rt::io`, based on the new
10454 * std: A new generic `range` function was added to the prelude, replacing
10455 `uint::range` and friends.
10456 * std: `range_rev` no longer exists. Since range is an iterator it can be
10457 reversed with `range(lo, hi).invert()`.
10458 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10459 renamed to `unwrap_or`.
10460 * std: The `iterator` module was renamed to `iter`.
10461 * std: Integral types now support the `checked_add`, `checked_sub`, and
10462 `checked_mul` operations for detecting overflow.
10463 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10465 * std: Methods are standardizing on conventions for casting methods:
10466 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10468 * std: The `CString` type in `c_str` provides new ways to convert to and
10470 * std: `DoubleEndedIterator` can yield elements in two directions.
10471 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10473 * std: `str::from_bytes` renamed to `str::from_utf8`.
10474 * std: `pop_opt` and `shift_opt` methods added to vectors.
10475 * std: The task-local data interface no longer uses @, and keys are
10476 no longer function pointers.
10477 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10478 * std: Added `SharedPort` to `comm`.
10479 * std: `Eq` has a default method for `ne`; only `eq` is required
10480 in implementations.
10481 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10482 is required in implementations.
10483 * std: `is_utf8` performance is improved, impacting many string functions.
10484 * std: `os::MemoryMap` provides cross-platform mmap.
10485 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10486 are not 'in-bounds' are considered undefined.
10487 * std: Many freestanding functions in `vec` removed in favor of methods.
10488 * std: Many freestanding functions on scalar types removed in favor of
10490 * std: Many options to task builders were removed since they don't make
10491 sense in the new scheduler design.
10492 * std: More containers implement `FromIterator` so can be created by the
10494 * std: More complete atomic types in `unstable::atomics`.
10495 * std: `comm::PortSet` removed.
10496 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10497 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10498 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10499 default implementations.
10500 * std: Various `from_str` functions were removed in favor of a generic
10501 `from_str` which is available in the prelude.
10502 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10503 * extra: `dlist`, the doubly-linked list was modernized.
10504 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10505 * extra: Added `glob` module, replacing `std::os::glob`.
10506 * extra: `rope` was removed.
10507 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10508 * extra: `net`, and `timer` were removed. The experimental replacements
10509 are `std::rt::io::net` and `std::rt::io::timer`.
10510 * extra: Iterators implemented for `SmallIntMap`.
10511 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10512 * extra: `SmallIntSet` removed. Use `BitvSet`.
10513 * extra: Performance of JSON parsing greatly improved.
10514 * extra: `semver` updated to SemVer 2.0.0.
10515 * extra: `term` handles more terminals correctly.
10516 * extra: `dbg` module removed.
10517 * extra: `par` module removed.
10518 * extra: `future` was cleaned up, with some method renames.
10519 * extra: Most free functions in `getopts` were converted to methods.
10522 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10523 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10524 similarly to gcc's `--march` flag.
10525 * rustc's performance compiling small crates is much better.
10526 * rustpkg has received many improvements.
10527 * rustpkg supports git tags as package IDs.
10528 * rustpkg builds into target-specific directories so it can be used for
10530 * The number of concurrent test tasks is controlled by the environment
10531 variable RUST_TEST_TASKS.
10532 * The test harness can now report metrics for benchmarks.
10533 * All tools have man pages.
10534 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10535 * The runtime uses jemalloc for allocations.
10536 * Segmented stacks are temporarily disabled as part of the transition to
10537 the new runtime. Stack overflows are possible!
10538 * A new documentation backend, rustdoc_ng, is available for use. It is
10539 still invoked through the normal `rustdoc` command.
10542 Version 0.7 (2013-07-03)
10543 =======================
10545 * ~2000 changes, numerous bugfixes
10548 * `impl`s no longer accept a visibility qualifier. Put them on methods
10550 * The borrow checker has been rewritten with flow-sensitivity, fixing
10551 many bugs and inconveniences.
10552 * The `self` parameter no longer implicitly means `&'self self`,
10553 and can be explicitly marked with a lifetime.
10554 * Overloadable compound operators (`+=`, etc.) have been temporarily
10555 removed due to bugs.
10556 * The `for` loop protocol now requires `for`-iterators to return `bool`
10557 so they compose better.
10558 * The `Durable` trait is replaced with the `'static` bounds.
10559 * Trait default methods work more often.
10560 * Structs with the `#[packed]` attribute have byte alignment and
10561 no padding between fields.
10562 * Type parameters bound by `Copy` must now be copied explicitly with
10563 the `copy` keyword.
10564 * It is now illegal to move out of a dereferenced unsafe pointer.
10565 * `Option<~T>` is now represented as a nullable pointer.
10566 * `@mut` does dynamic borrow checks correctly.
10567 * The `main` function is only detected at the topmost level of the crate.
10568 The `#[main]` attribute is still valid anywhere.
10569 * Struct fields may no longer be mutable. Use inherited mutability.
10570 * The `#[no_send]` attribute makes a type that would otherwise be
10572 * The `#[no_freeze]` attribute makes a type that would otherwise be
10574 * Unbounded recursion will abort the process after reaching the limit
10575 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10576 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10577 are never implicitly copyable.
10578 * `#[static_assert]` makes compile-time assertions about static bools.
10579 * At long last, 'argument modes' no longer exist.
10580 * The rarely used `use mod` statement no longer exists.
10582 * Syntax extensions
10583 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10585 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10586 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10587 `#[deriving(...)]`.
10588 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10589 and unsuffixed integer literals.
10592 * The `core` crate was renamed to `std`.
10593 * The `std` crate was renamed to `extra`.
10594 * More and improved documentation.
10595 * std: `iterator` module for external iterator objects.
10596 * Many old-style (internal, higher-order function) iterators replaced by
10597 implementations of `Iterator`.
10598 * std: Many old internal vector and string iterators,
10599 incl. `any`, `all`. removed.
10600 * std: The `finalize` method of `Drop` renamed to `drop`.
10601 * std: The `drop` method now takes `&mut self` instead of `&self`.
10602 * std: The prelude no longer re-exports any modules, only types and traits.
10603 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10604 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10605 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10606 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10607 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10608 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10609 * std: Many types implement `Clone`.
10610 * std: `path` type renamed to `Path`.
10611 * std: `mut` module and `Mut` type removed.
10612 * std: Many standalone functions removed in favor of methods and iterators
10613 in `vec`, `str`. In the future methods will also work as functions.
10614 * std: `reinterpret_cast` removed. Use `transmute`.
10615 * std: ascii string handling in `std::ascii`.
10616 * std: `Rand` is implemented for ~/@.
10617 * std: `run` module for spawning processes overhauled.
10618 * std: Various atomic types added to `unstable::atomic`.
10619 * std: Various types implement `Zero`.
10620 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10621 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10622 * std: Added `os::mkdir_recursive`.
10623 * std: Added `os::glob` function performs filesystems globs.
10624 * std: `FuzzyEq` renamed to `ApproxEq`.
10625 * std: `Map` now defines `pop` and `swap` methods.
10626 * std: `Cell` constructors converted to static methods.
10627 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10628 * extra: `flate` module moved from `std` to `extra`.
10629 * extra: `fileinput` module for iterating over a series of files.
10630 * extra: `Complex` number type and `complex` module.
10631 * extra: `Rational` number type and `rational` module.
10632 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10633 * extra: `term` uses terminfo now, is more correct.
10634 * extra: `arc` functions converted to methods.
10635 * extra: Implementation of fixed output size variations of SHA-2.
10638 * `unused_variables` lint mode for unused variables (default: warn).
10639 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10641 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10643 * `dead_assignment` lint mode for unread variables (default: warn).
10644 * `unnecessary_allocation` lint mode detects some heap allocations that are
10645 immediately borrowed so could be written without allocating (default: warn).
10646 * `missing_doc` lint mode (default: allow).
10647 * `unreachable_code` lint mode (default: warn).
10648 * The `rusti` command has been rewritten and a number of bugs addressed.
10649 * rustc outputs in color on more terminals.
10650 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10651 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10652 * Compiling with `-g` will make the binary record information about
10653 dynamic borrowcheck failures for debugging.
10654 * rustdoc has a nicer stylesheet.
10655 * Various improvements to rustdoc.
10656 * Improvements to rustpkg (see the detailed release notes).
10659 Version 0.6 (2013-04-03)
10660 ========================
10662 * ~2100 changes, numerous bugfixes
10665 * The self type parameter in traits is now spelled `Self`
10666 * The `self` parameter in trait and impl methods must now be explicitly
10667 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10668 * Static methods no longer require the `static` keyword and instead
10669 are distinguished by the lack of a `self` parameter
10670 * Replaced the `Durable` trait with the `'static` lifetime
10671 * The old closure type syntax with the trailing sigil has been
10672 removed in favor of the more consistent leading sigil
10673 * `super` is a keyword, and may be prefixed to paths
10674 * Trait bounds are separated with `+` instead of whitespace
10675 * Traits are implemented with `impl Trait for Type`
10676 instead of `impl Type: Trait`
10677 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10678 * The `export` keyword has finally been removed
10679 * The `move` keyword has been removed (see "Semantic changes")
10680 * The interior mutability qualifier on vectors, `[mut T]`, has been
10681 removed. Use `&mut [T]`, etc.
10682 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10683 * `fail` is no longer a keyword. Use `fail!()`
10684 * `assert` is no longer a keyword. Use `assert!()`
10685 * `log` is no longer a keyword. use `debug!`, etc.
10686 * 1-tuples may be represented as `(T,)`
10687 * Struct fields may no longer be `mut`. Use inherited mutability,
10688 `@mut T`, `core::mut` or `core::cell`
10689 * `extern mod { ... }` is no longer valid syntax for foreign
10690 function modules. Use extern blocks: `extern { ... }`
10691 * Newtype enums removed. Use tuple-structs.
10692 * Trait implementations no longer support visibility modifiers
10693 * Pattern matching over vectors improved and expanded
10694 * `const` renamed to `static` to correspond to lifetime name,
10695 and make room for future `static mut` unsafe mutable globals.
10696 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10697 * `Clone` implementations can be automatically generated with
10698 `#[deriving(Clone)]`
10699 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10700 instead of `foo as Bar`.
10701 * Fixed length vector types are now written as `[int, .. 3]`
10702 instead of `[int * 3]`.
10703 * Fixed length vector types can express the length as a constant
10704 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10707 * Types with owned pointers or custom destructors move by default,
10708 eliminating the `move` keyword
10709 * All foreign functions are considered unsafe
10710 * &mut is now unaliasable
10711 * Writes to borrowed @mut pointers are prevented dynamically
10713 * The name of the main function can be customized using #[main]
10714 * The default type of an inferred closure is &fn instead of @fn
10715 * `use` statements may no longer be "chained" - they cannot import
10716 identifiers imported by previous `use` statements
10717 * `use` statements are crate relative, importing from the "top"
10718 of the crate by default. Paths may be prefixed with `super::`
10719 or `self::` to change the search behavior.
10720 * Method visibility is inherited from the implementation declaration
10721 * Structural records have been removed
10722 * Many more types can be used in static items, including enums
10723 'static-lifetime pointers and vectors
10724 * Pattern matching over vectors improved and expanded
10725 * Typechecking of closure types has been overhauled to
10726 improve inference and eliminate unsoundness
10727 * Macros leave scope at the end of modules, unless that module is
10728 tagged with #[macro_escape]
10731 * Added big integers to `std::bigint`
10732 * Removed `core::oldcomm` module
10733 * Added pipe-based `core::comm` module
10734 * Numeric traits have been reorganized under `core::num`
10735 * `vec::slice` finally returns a slice
10736 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10737 * Containers reorganized around traits in `core::container`
10738 * `core::dvec` removed, `~[T]` is a drop-in replacement
10739 * `core::send_map` renamed to `core::hashmap`
10740 * `std::map` removed; replaced with `core::hashmap`
10741 * `std::treemap` reimplemented as an owned balanced tree
10742 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10743 * `core::trie` added as a fast ordered map for integer keys
10744 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10745 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10746 overload the comparison operators, whereas `TotalOrd` is used
10747 by certain container types
10750 * Replaced the 'cargo' package manager with 'rustpkg'
10751 * Added all-purpose 'rust' tool
10752 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10753 * rustc now *attempts* to offer spelling suggestions
10754 * Improved support for ARM and Android
10755 * Preliminary MIPS backend
10756 * Improved foreign function ABI implementation for x86, x86_64
10757 * Various memory usage improvements
10758 * Rust code may be embedded in foreign code under limited circumstances
10759 * Inline assembler supported by new asm!() syntax extension.
10762 Version 0.5 (2012-12-21)
10763 ===========================
10765 * ~900 changes, numerous bugfixes
10768 * Removed `<-` move operator
10769 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10770 * Removed old fixed length vector syntax - `[T]/N`
10771 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10772 * Macros may now expand to items and statements
10773 * `a.b()` is always parsed as a method call, never as a field projection
10774 * `Eq` and `IterBytes` implementations can be automatically generated
10775 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10776 * Removed the special crate language for `.rc` files
10777 * Function arguments may consist of any irrefutable pattern
10780 * `&` and `~` pointers may point to objects
10781 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10782 * Enum variants may be structs
10783 * Destructors can be added to all nominal types with the Drop trait
10784 * Structs and nullary enum variants may be constants
10785 * Values that cannot be implicitly copied are now automatically moved
10786 without writing `move` explicitly
10787 * `&T` may now be coerced to `*T`
10788 * Coercions happen in `let` statements as well as function calls
10789 * `use` statements now take crate-relative paths
10790 * The module and type namespaces have been merged so that static
10791 method names can be resolved under the trait in which they are
10794 * Improved support for language features
10795 * Trait inheritance works in many scenarios
10796 * More support for explicit self arguments in methods - `self`, `&self`
10797 `@self`, and `~self` all generally work as expected
10798 * Static methods work in more situations
10799 * Experimental: Traits may declare default methods for the implementations
10803 * New condition handling system in `core::condition`
10804 * Timsort added to `std::sort`
10805 * New priority queue, `std::priority_queue`
10806 * Pipes for serializable types, `std::flatpipes'
10807 * Serialization overhauled to be trait-based
10808 * Expanded `getopts` definitions
10809 * Moved futures to `std`
10810 * More functions are pure now
10811 * `core::comm` renamed to `oldcomm`. Still deprecated
10812 * `rustdoc` and `cargo` are libraries now
10815 * Added a preliminary REPL, `rusti`
10816 * License changed from MIT to dual MIT/APL2
10819 Version 0.4 (2012-10-15)
10820 ==========================
10822 * ~2000 changes, numerous bugfixes
10825 * All keywords are now strict and may not be used as identifiers anywhere
10826 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10827 'of', 'with', 'to', 'class'.
10828 * Classes are replaced with simpler structs
10829 * Explicit method self types
10830 * `ret` became `return` and `alt` became `match`
10831 * `import` is now `use`; `use is now `extern mod`
10832 * `extern mod { ... }` is now `extern { ... }`
10833 * `use mod` is the recommended way to import modules
10834 * `pub` and `priv` replace deprecated export lists
10835 * The syntax of `match` pattern arms now uses fat arrow (=>)
10836 * `main` no longer accepts an args vector; use `os::args` instead
10839 * Trait implementations are now coherent, ala Haskell typeclasses
10840 * Trait methods may be static
10841 * Argument modes are deprecated
10842 * Borrowed pointers are much more mature and recommended for use
10843 * Strings and vectors in the static region are stored in constant memory
10844 * Typestate was removed
10845 * Resolution rewritten to be more reliable
10846 * Support for 'dual-mode' data structures (freezing and thawing)
10849 * Most binary operators can now be overloaded via the traits in
10851 * `std::net::url` for representing URLs
10852 * Sendable hash maps in `core::send_map`
10853 * `core::task' gained a (currently unsafe) task-local storage API
10856 * An efficient new intertask communication primitive called the pipe,
10857 along with a number of higher-level channel types, in `core::pipes`
10858 * `std::arc`, an atomically reference counted, immutable, shared memory
10860 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10861 * Futures are now based on pipes and sendable
10862 * More robust linked task failure
10863 * Improved task builder API
10866 * Improved error reporting
10867 * Preliminary JIT support
10868 * Preliminary work on precise GC
10869 * Extensive architectural improvements to rustc
10870 * Begun a transition away from buggy C++-based reflection (shape) code to
10871 Rust-based (visitor) code
10872 * All hash functions and tables converted to secure, randomized SipHash
10875 Version 0.3 (2012-07-12)
10876 ========================
10878 * ~1900 changes, numerous bugfixes
10880 * New coding conveniences
10881 * Integer-literal suffix inference
10882 * Per-item control over warnings, errors
10883 * #[cfg(windows)] and #[cfg(unix)] attributes
10884 * Documentation comments
10885 * More compact closure syntax
10886 * 'do' expressions for treating higher-order functions as
10888 * *-patterns (wildcard extended to all constructor fields)
10891 * Name resolution pass and exhaustiveness checker rewritten
10892 * Region pointers and borrow checking supersede alias
10894 * Init-ness checking is now provided by a region-based liveness
10895 pass instead of the typestate pass; same for last-use analysis
10896 * Extensive work on region pointers
10898 * Experimental new language features
10899 * Slices and fixed-size, interior-allocated vectors
10900 * #!-comments for lang versioning, shell execution
10901 * Destructors and iface implementation for classes;
10902 type-parameterized classes and class methods
10903 * 'const' type kind for types that can be used to implement
10904 shared-memory concurrency patterns
10908 * Removal of various obsolete features
10909 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10910 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10912 * Constructs: do-while loops ('do' repurposed), fn binding,
10913 resources (replaced by destructors)
10915 * Compiler reorganization
10916 * Syntax-layer of compiler split into separate crate
10917 * Clang (from LLVM project) integrated into build
10918 * Typechecker split into sub-modules
10921 * New time functions
10922 * Extension methods for many built-in types
10923 * Arc: atomic-refcount read-only / exclusive-use shared cells
10924 * Par: parallel map and search routines
10925 * Extensive work on libuv interface
10926 * Much vector code moved to libraries
10927 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10928 #include, #include_str, #include_bin
10930 * Tool improvements
10931 * Cargo automatically resolves dependencies
10934 Version 0.2 (2012-03-29)
10935 =========================
10937 * >1500 changes, numerous bugfixes
10939 * New docs and doc tooling
10941 * New port: FreeBSD x86_64
10943 * Compilation model enhancements
10944 * Generics now specialized, multiply instantiated
10945 * Functions now inlined across separate crates
10947 * Scheduling, stack and threading fixes
10948 * Noticeably improved message-passing performance
10949 * Explicit schedulers
10953 * Experimental new language features
10954 * Operator overloading
10958 * Various language extensions
10959 * C-callback function types: 'crust fn ...'
10960 * Infinite-loop construct: 'loop { ... }'
10961 * Shorten 'mutable' to 'mut'
10962 * Required mutable-local qualifier: 'let mut ...'
10963 * Basic glob-exporting: 'export foo::*;'
10964 * Alt now exhaustive, 'alt check' for runtime-checked
10965 * Block-function form of 'for' loop, with 'break' and 'ret'.
10968 * AST quasi-quote syntax extension
10969 * Revived libuv interface
10970 * New modules: core::{future, iter}, std::arena
10971 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10972 * Extensive cleanup, regularization in libstd, libcore
10975 Version 0.1 (2012-01-20)
10976 ===============================
10978 * Most language features work, including:
10979 * Unique pointers, unique closures, move semantics
10980 * Interface-constrained generics
10981 * Static interface dispatch
10983 * Multithread task scheduling
10984 * Typestate predicates
10985 * Failure unwinding, destructors
10986 * Pattern matching and destructuring assignment
10987 * Lightweight block-lambda syntax
10988 * Preliminary macro-by-example
10990 * Compiler works with the following configurations:
10991 * Linux: x86 and x86_64 hosts and targets
10992 * macOS: x86 and x86_64 hosts and targets
10993 * Windows: x86 hosts and targets
10995 * Cross compilation / multi-target configuration supported.
10997 * Preliminary API-documentation and package-management tools included.
11001 * Documentation is incomplete.
11003 * Performance is below intended target.
11005 * Standard library APIs are subject to extensive change, reorganization.
11007 * Language-level versioning is not yet operational - future code will
11008 break unexpectedly.