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 - [`Result::unwrap_unchecked`]
45 - [`Result::unwrap_err_unchecked`]
48 These APIs are now usable in const contexts:
51 - [`Duration::checked_add`]
52 - [`Duration::saturating_add`]
53 - [`Duration::checked_sub`]
54 - [`Duration::saturating_sub`]
55 - [`Duration::checked_mul`]
56 - [`Duration::saturating_mul`]
57 - [`Duration::checked_div`]
62 - [Add --message-format for install command][cargo/10107]
63 - [Warn when alias shadows external subcommand][cargo/10082]
68 - [Show all Deref implementations recursively in rustdoc][90183]
69 - [Use computed visibility in rustdoc][88447]
74 - [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.
75 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
76 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
77 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
78 - [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.
79 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
84 These changes provide no direct user facing benefits, but represent significant
85 improvements to the internals and overall performance of rustc
88 - [Implement coherence checks for negative trait impls][90104]
89 - [Add rustc lint, warning when iterating over hashmaps][89558]
90 - [Optimize live point computation][90491]
91 - [Enable verification for 1/32nd of queries loaded from disk][90361]
92 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
94 [87337]: https://github.com/rust-lang/rust/pull/87337/
95 [87467]: https://github.com/rust-lang/rust/pull/87467/
96 [87704]: https://github.com/rust-lang/rust/pull/87704/
97 [88041]: https://github.com/rust-lang/rust/pull/88041/
98 [88300]: https://github.com/rust-lang/rust/pull/88300/
99 [88447]: https://github.com/rust-lang/rust/pull/88447/
100 [88601]: https://github.com/rust-lang/rust/pull/88601/
101 [88624]: https://github.com/rust-lang/rust/pull/88624/
102 [89062]: https://github.com/rust-lang/rust/pull/89062/
103 [89174]: https://github.com/rust-lang/rust/pull/89174/
104 [89542]: https://github.com/rust-lang/rust/pull/89542/
105 [89551]: https://github.com/rust-lang/rust/pull/89551/
106 [89558]: https://github.com/rust-lang/rust/pull/89558/
107 [89580]: https://github.com/rust-lang/rust/pull/89580/
108 [89652]: https://github.com/rust-lang/rust/pull/89652/
109 [89677]: https://github.com/rust-lang/rust/pull/89677/
110 [89951]: https://github.com/rust-lang/rust/pull/89951/
111 [90041]: https://github.com/rust-lang/rust/pull/90041/
112 [90058]: https://github.com/rust-lang/rust/pull/90058/
113 [90104]: https://github.com/rust-lang/rust/pull/90104/
114 [90117]: https://github.com/rust-lang/rust/pull/90117/
115 [90175]: https://github.com/rust-lang/rust/pull/90175/
116 [90183]: https://github.com/rust-lang/rust/pull/90183/
117 [90297]: https://github.com/rust-lang/rust/pull/90297/
118 [90329]: https://github.com/rust-lang/rust/pull/90329/
119 [90361]: https://github.com/rust-lang/rust/pull/90361/
120 [90417]: https://github.com/rust-lang/rust/pull/90417/
121 [90473]: https://github.com/rust-lang/rust/pull/90473/
122 [90491]: https://github.com/rust-lang/rust/pull/90491/
123 [90733]: https://github.com/rust-lang/rust/pull/90733/
124 [90833]: https://github.com/rust-lang/rust/pull/90833/
125 [90846]: https://github.com/rust-lang/rust/pull/90846/
126 [90896]: https://github.com/rust-lang/rust/pull/90896/
127 [91026]: https://github.com/rust-lang/rust/pull/91026/
128 [91207]: https://github.com/rust-lang/rust/pull/91207/
129 [91255]: https://github.com/rust-lang/rust/pull/91255/
130 [91301]: https://github.com/rust-lang/rust/pull/91301/
131 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
132 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
133 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
134 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
135 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
136 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
137 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
138 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
139 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
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
163 Version 1.57.0 (2021-12-02)
164 ==========================
169 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
170 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
171 - [Allow panicking in constant evaluation.][89508]
176 - [Create more accurate debuginfo for vtables.][89597]
177 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
178 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
179 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
180 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
182 \* Refer to Rust's [platform support page][platform-support-doc] for more
183 information on Rust's tiered platform support.
188 - [Avoid allocations and copying in `Vec::leak`][89337]
189 - [Add `#[repr(i8)]` to `Ordering`][89507]
190 - [Optimize `File::read_to_end` and `read_to_string`][89582]
191 - [Update to Unicode 14.0][89614]
192 - [Many more functions are marked `#[must_use]`][89692], producing a warning
193 when ignoring their return value. This helps catch mistakes such as expecting
194 a function to mutate a value in place rather than return a new value.
199 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
200 - [`[T; N]::as_slice`][`array::as_slice`]
201 - [`collections::TryReserveError`]
202 - [`HashMap::try_reserve`]
203 - [`HashSet::try_reserve`]
204 - [`String::try_reserve`]
205 - [`String::try_reserve_exact`]
206 - [`Vec::try_reserve`]
207 - [`Vec::try_reserve_exact`]
208 - [`VecDeque::try_reserve`]
209 - [`VecDeque::try_reserve_exact`]
210 - [`Iterator::map_while`]
212 - [`proc_macro::is_available`]
213 - [`Command::get_program`]
214 - [`Command::get_args`]
215 - [`Command::get_envs`]
216 - [`Command::get_current_dir`]
220 These APIs are now usable in const contexts:
222 - [`hint::unreachable_unchecked`]
227 - [Stabilize custom profiles][cargo/9943]
234 These changes provide no direct user facing benefits, but represent significant
235 improvements to the internals and overall performance of rustc
238 - [Added an experimental backend for codegen with `libgccjit`.][87260]
240 [86191]: https://github.com/rust-lang/rust/pull/86191/
241 [87220]: https://github.com/rust-lang/rust/pull/87220/
242 [87260]: https://github.com/rust-lang/rust/pull/87260/
243 [88243]: https://github.com/rust-lang/rust/pull/88243/
244 [88321]: https://github.com/rust-lang/rust/pull/88321/
245 [88529]: https://github.com/rust-lang/rust/pull/88529/
246 [88690]: https://github.com/rust-lang/rust/pull/88690/
247 [88952]: https://github.com/rust-lang/rust/pull/88952/
248 [89337]: https://github.com/rust-lang/rust/pull/89337/
249 [89507]: https://github.com/rust-lang/rust/pull/89507/
250 [89508]: https://github.com/rust-lang/rust/pull/89508/
251 [89582]: https://github.com/rust-lang/rust/pull/89582/
252 [89597]: https://github.com/rust-lang/rust/pull/89597/
253 [89614]: https://github.com/rust-lang/rust/pull/89614/
254 [89692]: https://github.com/rust-lang/rust/issues/89692/
255 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
256 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
257 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
258 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
259 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
260 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
261 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
262 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
263 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
264 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
265 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
266 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
267 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
268 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
269 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
270 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
271 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
272 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
273 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
274 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
275 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
277 Version 1.56.1 (2021-11-01)
278 ===========================
280 - New lints to detect the presence of bidirectional-override Unicode
281 codepoints in the compiled source code ([CVE-2021-42574])
283 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
285 Version 1.56.0 (2021-10-21)
286 ========================
291 - [The 2021 Edition is now stable.][rust#88100]
292 See [the edition guide][rust-2021-edition-guide] for more details.
293 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
294 - [Union field access is permitted in `const fn`.][rust#85769]
296 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
301 - [Upgrade to LLVM 13.][rust#87570]
302 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
303 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
304 - [Warnings can be forced on with `--force-warn`.][rust#87472]
305 This feature is primarily intended for usage by `cargo fix`, rather than end users.
306 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
307 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
308 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
310 \* Refer to Rust's [platform support page][platform-support-doc] for more
311 information on Rust's tiered platform support.
316 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
317 The Windows console still requires valid Unicode, but this change allows
318 splitting a UTF-8 character across multiple write calls. This allows, for
319 instance, programs that just read and write data buffers (e.g. copying a file
320 to stdout) without regard for Unicode or character boundaries.
321 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
322 For this use case, atomics scale much better under contention.
323 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
324 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
325 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
326 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
327 - [Treat invalid environment variable names as non-existent.][rust#86183]
328 Previously, the environment functions would panic if given a variable name
329 with an internal null character or equal sign (`=`). Now, these functions will
330 just treat such names as non-existent variables, since the OS cannot represent
331 the existence of a variable with such a name.
336 - [`std::os::unix::fs::chroot`]
337 - [`UnsafeCell::raw_get`]
338 - [`BufWriter::into_parts`]
339 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
340 These APIs were previously stable in `std`, but are now also available in `core`.
342 - [`String::shrink_to`]
343 - [`OsString::shrink_to`]
344 - [`PathBuf::shrink_to`]
345 - [`BinaryHeap::shrink_to`]
346 - [`VecDeque::shrink_to`]
347 - [`HashMap::shrink_to`]
348 - [`HashSet::shrink_to`]
350 These APIs are now usable in const contexts:
352 - [`std::mem::transmute`]
353 - [`[T]::first`][`slice::first`]
354 - [`[T]::split_first`][`slice::split_first`]
355 - [`[T]::last`][`slice::last`]
356 - [`[T]::split_last`][`slice::split_last`]
361 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
362 This has no effect at present on dependency version selection.
363 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
364 that support Rust code to include a crate's specified minimum version in the test matrix for that
370 - [Update to new argument parsing rules on Windows.][rust#87580]
371 This adjusts Rust's standard library to match the behavior of the standard
372 libraries for C/C++. The rules have changed slightly over time, and this PR
373 brings us to the latest set of rules (changed in 2008).
374 - [Disallow the aapcs calling convention on aarch64][rust#88399]
375 This was already not supported by LLVM; this change surfaces this lack of
376 support with a better error message.
377 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
378 - [Warn when an escaped newline skips multiple lines.][rust#87671]
379 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
380 may return different values on glibc <= 2.24.][rust#81825]
381 Rust now invokes the `clone3` system call directly, when available, to use new functionality
382 available via that system call. Older versions of glibc cache the result of `getpid`, and only
383 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
384 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
388 These changes provide no direct user facing benefits, but represent significant
389 improvements to the internals and overall performance of rustc
392 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
393 This improves the performance of most Rust builds.
394 - [Unify representation of macros in internal data structures.][rust#88019]
395 This change fixes a host of bugs with the handling of macros by the compiler,
398 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
399 [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
400 [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
401 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
402 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
403 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
404 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
405 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
406 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
407 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
408 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
409 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
410 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
411 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
412 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
413 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
414 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
415 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
416 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
417 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
418 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
419 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
420 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
421 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
422 [rust#86860]: https://github.com/rust-lang/rust/pull/86860
423 [rust#84039]: https://github.com/rust-lang/rust/pull/84039
424 [rust#86492]: https://github.com/rust-lang/rust/pull/86492
425 [rust#88363]: https://github.com/rust-lang/rust/pull/88363
426 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
427 [rust#87832]: https://github.com/rust-lang/rust/pull/87832
428 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
429 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
430 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
431 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
432 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
433 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
434 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
435 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
436 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
437 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
438 [rust#88177]: https://github.com/rust-lang/rust/pull/88177
439 [rust#88548]: https://github.com/rust-lang/rust/pull/88548
440 [rust#88551]: https://github.com/rust-lang/rust/pull/88551
441 [rust#88299]: https://github.com/rust-lang/rust/pull/88299
442 [rust#88220]: https://github.com/rust-lang/rust/pull/88220
443 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
444 [rust#86879]: https://github.com/rust-lang/rust/pull/86879
445 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
446 [rust#84662]: https://github.com/rust-lang/rust/pull/84662
447 [rust#86593]: https://github.com/rust-lang/rust/pull/86593
448 [rust#81050]: https://github.com/rust-lang/rust/pull/81050
449 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
450 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
451 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
452 [rust#88490]: https://github.com/rust-lang/rust/pull/88490
453 [rust#88269]: https://github.com/rust-lang/rust/pull/88269
454 [rust#84176]: https://github.com/rust-lang/rust/pull/84176
455 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
456 [rust#88227]: https://github.com/rust-lang/rust/pull/88227
457 [rust#88200]: https://github.com/rust-lang/rust/pull/88200
458 [rust#82776]: https://github.com/rust-lang/rust/pull/82776
459 [rust#88077]: https://github.com/rust-lang/rust/pull/88077
460 [rust#87728]: https://github.com/rust-lang/rust/pull/87728
461 [rust#87050]: https://github.com/rust-lang/rust/pull/87050
462 [rust#87619]: https://github.com/rust-lang/rust/pull/87619
463 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
464 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
465 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
467 Version 1.55.0 (2021-09-09)
468 ============================
472 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
473 will end at the maximum value of the integer.][83918]
474 - [You can now explicitly import the prelude of different editions
475 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
479 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
481 \* Refer to Rust's [platform support page][platform-support-doc] for more
482 information on Rust's tiered platform support.
487 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
488 These improvements should in general provide faster string parsing of floats,
489 no longer reject certain valid floating point values, and reduce
490 the produced code size for non-stripped artifacts.
491 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
498 - [`IntoInnerError::into_error`]
499 - [`IntoInnerError::into_parts`]
500 - [`MaybeUninit::assume_init_mut`]
501 - [`MaybeUninit::assume_init_ref`]
502 - [`MaybeUninit::write`]
504 - [`ops::ControlFlow`]
506 - [`x86::_bittestandcomplement`]
507 - [`x86::_bittestandreset`]
508 - [`x86::_bittestandset`]
509 - [`x86_64::_bittest64`]
510 - [`x86_64::_bittestandcomplement64`]
511 - [`x86_64::_bittestandreset64`]
512 - [`x86_64::_bittestandset64`]
514 The following previously stable functions are now `const`.
516 - [`str::from_utf8_unchecked`]
521 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
522 rustc in parallel such as when using `cargo test`.][cargo/9675]
523 - [The package definition in `cargo metadata` now includes the `"default_run"`
524 field from the manifest.][cargo/9550]
525 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
526 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
527 of packages.][cargo/9663]
531 - [Added "Go to item on exact match" search option.][85876]
532 - [The "Implementors" section on traits no longer shows redundant
533 method definitions.][85970]
534 - [Trait implementations are toggled open by default.][86260] This should make the
535 implementations more searchable by tools like `CTRL+F` in your browser.
536 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
537 through type aliases.][86334]
538 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
539 "Trait Implementations" section.][86513]
544 - [std functions that return an `io::Error` will no longer use the
545 `ErrorKind::Other` variant.][85746] This is to better reflect that these
546 kinds of errors could be categorised [into newer more specific `ErrorKind`
547 variants][79965], and that they do not represent a user error.
548 - [Using environment variable names with `process::Command` on Windows now
549 behaves as expected.][85270] Previously using envionment variables with
550 `Command` would cause them to be ASCII-uppercased.
551 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
552 with `rustdoc::`][86849]
553 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
554 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
555 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
558 [86849]: https://github.com/rust-lang/rust/pull/86849
559 [86513]: https://github.com/rust-lang/rust/pull/86513
560 [86334]: https://github.com/rust-lang/rust/pull/86334
561 [86260]: https://github.com/rust-lang/rust/pull/86260
562 [85970]: https://github.com/rust-lang/rust/pull/85970
563 [85876]: https://github.com/rust-lang/rust/pull/85876
564 [83572]: https://github.com/rust-lang/rust/pull/83572
565 [86294]: https://github.com/rust-lang/rust/pull/86294
566 [86858]: https://github.com/rust-lang/rust/pull/86858
567 [86761]: https://github.com/rust-lang/rust/pull/86761
568 [85769]: https://github.com/rust-lang/rust/pull/85769
569 [85746]: https://github.com/rust-lang/rust/pull/85746
570 [85305]: https://github.com/rust-lang/rust/pull/85305
571 [85270]: https://github.com/rust-lang/rust/pull/85270
572 [84111]: https://github.com/rust-lang/rust/pull/84111
573 [83918]: https://github.com/rust-lang/rust/pull/83918
574 [79965]: https://github.com/rust-lang/rust/pull/79965
575 [87370]: https://github.com/rust-lang/rust/pull/87370
576 [87298]: https://github.com/rust-lang/rust/pull/87298
577 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
578 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
579 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
580 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
581 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
582 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
583 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
584 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
585 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
586 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
587 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
588 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
589 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
590 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
591 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
592 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
593 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
594 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
595 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
596 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
597 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
598 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
599 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
600 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
603 Version 1.54.0 (2021-07-29)
604 ============================
607 -----------------------
609 - [You can now use macros for values in some built-in attributes.][83366]
610 This primarily allows you to call macros within the `#[doc]` attribute. For
611 example, to include external documentation in your crate, you can now write
614 #![doc = include_str!("README.md")]
617 - [You can now cast between unsized slice types (and types which contain
618 unsized slices) in `const fn`.][85078]
619 - [You can now use multiple generic lifetimes with `impl Trait` where the
620 lifetimes don't explicitly outlive another.][84701] In code this means
621 that you can now have `impl Trait<'a, 'b>` where as before you could
622 only have `impl Trait<'a, 'b> where 'b: 'a`.
625 -----------------------
627 - [Rustc will now search for custom JSON targets in
628 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
629 directory.][83800] You can find your sysroot directory by running
630 `rustc --print sysroot`.
631 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
632 - [You can now use `#[target_feature]` on safe functions when targeting
633 WebAssembly platforms.][84988]
634 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
635 - [Added tier 3\* support for `bpfel-unknown-none`
636 and `bpfeb-unknown-none`.][79608]
637 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
639 \* Refer to Rust's [platform support page][platform-support-doc] for more
640 information on Rust's tiered platform support.
643 -----------------------
645 - [`panic::panic_any` will now `#[track_caller]`.][85745]
646 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
647 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
648 - [The implementations of vendor intrinsics in core::arch have been
649 significantly refactored.][83278] The main user-visible changes are
650 a 50% reduction in the size of libcore.rlib and stricter validation
651 of constant operands passed to intrinsics. The latter is technically
652 a breaking change, but allows Rust to more closely match the C vendor
658 - [`BTreeMap::into_keys`]
659 - [`BTreeMap::into_values`]
660 - [`HashMap::into_keys`]
661 - [`HashMap::into_values`]
663 - [`VecDeque::binary_search`]
664 - [`VecDeque::binary_search_by`]
665 - [`VecDeque::binary_search_by_key`]
666 - [`VecDeque::partition_point`]
671 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
672 the dependency graph.][cargo/9520]
673 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
674 in the tree ][cargo/9499]
675 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
676 macro dependencies.][cargo/9488]
677 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
678 This variable points to a directory that integration tests and benches
679 can use as a "scratchpad" for testing filesystem operations.
683 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
684 - [Previously unsound code is no longer permitted where different constructors in branches
685 could require different lifetimes.][85574]
686 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
687 than before and may reject some previously accepted code.
688 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
689 when compiled with `codegen-units = 1`.][86063]
691 [85574]: https://github.com/rust-lang/rust/issues/85574
692 [86831]: https://github.com/rust-lang/rust/issues/86831
693 [86063]: https://github.com/rust-lang/rust/issues/86063
694 [86831]: https://github.com/rust-lang/rust/issues/86831
695 [79608]: https://github.com/rust-lang/rust/pull/79608
696 [84988]: https://github.com/rust-lang/rust/pull/84988
697 [84701]: https://github.com/rust-lang/rust/pull/84701
698 [84072]: https://github.com/rust-lang/rust/pull/84072
699 [85745]: https://github.com/rust-lang/rust/pull/85745
700 [84744]: https://github.com/rust-lang/rust/pull/84744
701 [85078]: https://github.com/rust-lang/rust/pull/85078
702 [84717]: https://github.com/rust-lang/rust/pull/84717
703 [83800]: https://github.com/rust-lang/rust/pull/83800
704 [83366]: https://github.com/rust-lang/rust/pull/83366
705 [83278]: https://github.com/rust-lang/rust/pull/83278
706 [85292]: https://github.com/rust-lang/rust/pull/85292
707 [82834]: https://github.com/rust-lang/rust/pull/82834
708 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
709 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
710 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
711 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
712 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
713 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
714 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
715 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
716 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
717 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
718 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
720 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
722 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
724 Version 1.53.0 (2021-06-17)
725 ============================
728 -----------------------
729 - [You can now use unicode for identifiers.][83799] This allows multilingual
730 identifiers but still doesn't allow glyphs that are not considered characters
731 such as `◆` or `🦀`. More specifically you can now use any identifier that
732 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
733 is the same standard as languages like Python, however Rust uses NFC
734 normalization which may be different from other languages.
735 - [You can now specify "or patterns" inside pattern matches.][79278]
736 Previously you could only use `|` (OR) on complete patterns. E.g.
740 matches!(x, Some(1) | Some(2));
742 matches!(x, Some(1 | 2));
744 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
745 has the same semantics as the `:pat` matcher. This is to allow `:pat`
746 to change semantics to being a pattern fragment in a future edition.
749 -----------------------
750 - [Updated the minimum external LLVM version to LLVM 10.][83387]
751 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
752 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
754 \* Refer to Rust's [platform support page][platform-support-doc] for more
755 information on Rust's tiered platform support.
758 -----------------------
759 - [Abort messages will now forward to `android_set_abort_message` on
760 Android platforms when available.][81469]
761 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
762 - [Arrays of any length now implement `IntoIterator`.][84147]
763 Currently calling `.into_iter()` as a method on an array will
764 return `impl Iterator<Item=&T>`, but this may change in a
765 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
766 directly on arrays will provide `impl Iterator<Item=T>` as expected.
767 - [`leading_zeros`, and `trailing_zeros` are now available on all
768 `NonZero` integer types.][84082]
769 - [`{f32, f64}::from_str` now parse and print special values
770 (`NaN`, `-0`) according to IEEE 754.][78618]
771 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
772 - [Add the `BITS` associated constant to all numeric types.][82565]
776 - [`AtomicBool::fetch_update`]
777 - [`AtomicPtr::fetch_update`]
778 - [`BTreeMap::retain`]
779 - [`BTreeSet::retain`]
780 - [`BufReader::seek_relative`]
781 - [`DebugStruct::non_exhaustive`]
784 - [`Duration::is_zero`]
785 - [`Duration::saturating_add`]
786 - [`Duration::saturating_mul`]
787 - [`Duration::saturating_sub`]
788 - [`ErrorKind::Unsupported`]
790 - [`Ordering::is_eq`]
791 - [`Ordering::is_ge`]
792 - [`Ordering::is_gt`]
793 - [`Ordering::is_le`]
794 - [`Ordering::is_lt`]
795 - [`Ordering::is_ne`]
796 - [`OsStr::is_ascii`]
797 - [`OsStr::make_ascii_lowercase`]
798 - [`OsStr::make_ascii_uppercase`]
799 - [`OsStr::to_ascii_lowercase`]
800 - [`OsStr::to_ascii_uppercase`]
801 - [`Peekable::peek_mut`]
802 - [`Rc::decrement_strong_count`]
803 - [`Rc::increment_strong_count`]
804 - [`Vec::extend_from_within`]
805 - [`array::from_mut`]
806 - [`array::from_ref`]
807 - [`cmp::max_by_key`]
809 - [`cmp::min_by_key`]
811 - [`f32::is_subnormal`]
812 - [`f64::is_subnormal`]
815 -----------------------
816 - [Cargo now supports git repositories where the default `HEAD` branch is not
817 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
818 which can handle default branches correctly.
819 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
820 - [The `authors` field is no longer included in `Cargo.toml` for new
821 projects.][cargo/9282]
824 -----------------------
825 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
826 without hyperlinks.][81764]
830 - [Implement token-based handling of attributes during expansion][82608]
831 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
832 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
833 to confusion and potential security vulnerabilities and [is no
834 longer recommended][ietf6943].
835 - [The added `BITS` constant may conflict with external definitions.][85667]
836 In particular, this was known to be a problem in the `lexical-core` crate,
837 but they have published fixes for semantic versions 0.4 through 0.7. To
838 update this dependency alone, use `cargo update -p lexical-core`.
839 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
843 These changes provide no direct user facing benefits, but represent significant
844 improvements to the internals and overall performance of rustc and
847 - [Rework the `std::sys::windows::alloc` implementation.][83065]
848 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
849 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
850 - [Rework rustdoc const type][82873]
852 [85667]: https://github.com/rust-lang/rust/pull/85667
853 [83386]: https://github.com/rust-lang/rust/pull/83386
854 [82771]: https://github.com/rust-lang/rust/pull/82771
855 [84147]: https://github.com/rust-lang/rust/pull/84147
856 [84082]: https://github.com/rust-lang/rust/pull/84082
857 [83799]: https://github.com/rust-lang/rust/pull/83799
858 [83681]: https://github.com/rust-lang/rust/pull/83681
859 [83652]: https://github.com/rust-lang/rust/pull/83652
860 [83387]: https://github.com/rust-lang/rust/pull/83387
861 [82873]: https://github.com/rust-lang/rust/pull/82873
862 [82864]: https://github.com/rust-lang/rust/pull/82864
863 [82608]: https://github.com/rust-lang/rust/pull/82608
864 [82565]: https://github.com/rust-lang/rust/pull/82565
865 [80525]: https://github.com/rust-lang/rust/pull/80525
866 [79278]: https://github.com/rust-lang/rust/pull/79278
867 [78618]: https://github.com/rust-lang/rust/pull/78618
868 [77704]: https://github.com/rust-lang/rust/pull/77704
869 [83941]: https://github.com/rust-lang/rust/pull/83941
870 [83065]: https://github.com/rust-lang/rust/pull/83065
871 [81764]: https://github.com/rust-lang/rust/pull/81764
872 [81469]: https://github.com/rust-lang/rust/pull/81469
873 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
874 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
875 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
876 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
877 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
878 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
879 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
880 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
881 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
882 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
883 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
884 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
885 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
886 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
887 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
888 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
889 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
890 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
891 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
892 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
893 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
894 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
895 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
896 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
897 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
898 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
899 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
900 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
901 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
902 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
903 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
904 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
905 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
906 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
907 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
908 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
909 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
910 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
911 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
912 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
913 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
914 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
917 Version 1.52.1 (2021-05-10)
918 ============================
920 This release disables incremental compilation, unless the user has explicitly
921 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
923 This is due to the widespread, and frequently occuring, breakage encountered by
924 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
925 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
926 newly added incremental verification are still present in past stable versions,
927 and are not yet fixed on any channel. These bugs can lead to miscompilation of
930 These problems only affect incremental builds, so release builds with Cargo
931 should not be affected unless the user has explicitly opted into incremental.
932 Debug and check builds are affected.
934 See [84970] for more details.
936 [84970]: https://github.com/rust-lang/rust/issues/84970
938 Version 1.52.0 (2021-05-06)
939 ============================
943 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
944 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
945 is allowed by default, and may become a warning or hard error in a
947 - [You can now cast mutable references to arrays to a pointer of the same type as
952 - [Upgraded the default LLVM to LLVM 12.][81451]
954 Added tier 3\* support for the following targets.
956 - [`s390x-unknown-linux-musl`][82166]
957 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
958 - [`powerpc-unknown-openbsd`][82733]
960 \* Refer to Rust's [platform support page][platform-support-doc] for more
961 information on Rust's tiered platform support.
965 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
966 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
967 - [`Arc<impl Error>` now implements `error::Error`.][80553]
968 - [All integer division and remainder operations are now `const`.][80962]
972 - [`Arguments::as_str`]
974 - [`char::REPLACEMENT_CHARACTER`]
975 - [`char::UNICODE_VERSION`]
976 - [`char::decode_utf16`]
977 - [`char::from_digit`]
978 - [`char::from_u32_unchecked`]
980 - [`slice::partition_point`]
981 - [`str::rsplit_once`]
982 - [`str::split_once`]
984 The following previously stable APIs are now `const`.
987 - [`char::len_utf16`]
988 - [`char::to_ascii_uppercase`]
989 - [`char::to_ascii_lowercase`]
990 - [`char::eq_ignore_ascii_case`]
991 - [`u8::to_ascii_uppercase`]
992 - [`u8::to_ascii_lowercase`]
993 - [`u8::eq_ignore_ascii_case`]
997 - [Rustdoc lints are now treated as a tool lint, meaning that
998 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
999 Using the old style is still allowed, and will become a warning in
1001 - [Rustdoc now supports argument files.][82261]
1002 - [Rustdoc now generates smart punctuation for documentation.][79423]
1003 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1011 - [You can now pass multiple filters to tests.][81356] E.g.
1012 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1013 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1014 allowing you to see `std` symbols when debugging.][82218]
1018 These changes provide no direct user facing benefits, but represent significant
1019 improvements to the internals and overall performance of rustc and
1022 - [Check the result cache before the DepGraph when ensuring queries][81855]
1023 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1024 - [Only store a LocalDefId in some HIR nodes][81611]
1025 - [Store HIR attributes in a side table][79519]
1029 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1030 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1031 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1032 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1033 languages in code blocks.][78429]
1034 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1035 - [Changes in how proc macros handle whitespace may lead to panics when used
1036 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1037 - [Turn `#[derive]` into a regular macro attribute][79078]
1039 [84136]: https://github.com/rust-lang/rust/issues/84136
1040 [80763]: https://github.com/rust-lang/rust/pull/80763
1041 [82166]: https://github.com/rust-lang/rust/pull/82166
1042 [82121]: https://github.com/rust-lang/rust/pull/82121
1043 [81879]: https://github.com/rust-lang/rust/pull/81879
1044 [82261]: https://github.com/rust-lang/rust/pull/82261
1045 [82218]: https://github.com/rust-lang/rust/pull/82218
1046 [82216]: https://github.com/rust-lang/rust/pull/82216
1047 [82202]: https://github.com/rust-lang/rust/pull/82202
1048 [81855]: https://github.com/rust-lang/rust/pull/81855
1049 [81766]: https://github.com/rust-lang/rust/pull/81766
1050 [81744]: https://github.com/rust-lang/rust/pull/81744
1051 [81611]: https://github.com/rust-lang/rust/pull/81611
1052 [81479]: https://github.com/rust-lang/rust/pull/81479
1053 [81451]: https://github.com/rust-lang/rust/pull/81451
1054 [81356]: https://github.com/rust-lang/rust/pull/81356
1055 [80962]: https://github.com/rust-lang/rust/pull/80962
1056 [80553]: https://github.com/rust-lang/rust/pull/80553
1057 [80527]: https://github.com/rust-lang/rust/pull/80527
1058 [79519]: https://github.com/rust-lang/rust/pull/79519
1059 [79423]: https://github.com/rust-lang/rust/pull/79423
1060 [79208]: https://github.com/rust-lang/rust/pull/79208
1061 [78429]: https://github.com/rust-lang/rust/pull/78429
1062 [82733]: https://github.com/rust-lang/rust/pull/82733
1063 [82594]: https://github.com/rust-lang/rust/pull/82594
1064 [79078]: https://github.com/rust-lang/rust/pull/79078
1065 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1066 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1067 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1068 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1069 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1070 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1071 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1072 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1073 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1074 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1075 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1076 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1077 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1078 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1079 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1080 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1081 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1082 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1083 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1084 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1085 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1086 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1088 Version 1.51.0 (2021-03-25)
1089 ============================
1093 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1094 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1095 E.g. you can now write the following. Note: Only values of primitive integers,
1096 `bool`, or `char` types are currently permitted.
1098 struct GenericArray<T, const LENGTH: usize> {
1102 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1103 const fn last(&self) -> Option<&T> {
1107 Some(&self.inner[LENGTH - 1])
1117 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1118 This option controls whether debug information is split across multiple files
1119 or packed into a single file. **Note** This option is unstable on other platforms.
1120 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1121 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1122 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1123 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1125 \* Refer to Rust's [platform support page][platform-support-doc] for more
1126 information on Rust's tiered platform support.
1131 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1132 - [`str` now implements `AsMut<str>`.][80279]
1133 - [`u64` and `u128` now implement `From<char>`.][79502]
1134 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1135 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1136 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1137 - [`io::Empty` now implements `io::Seek`.][78044]
1138 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1139 `T: ?Sized` types.][80764]
1140 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1146 - [`Arc::decrement_strong_count`]
1147 - [`Arc::increment_strong_count`]
1148 - [`Once::call_once_force`]
1149 - [`Peekable::next_if_eq`]
1150 - [`Peekable::next_if`]
1151 - [`Seek::stream_position`]
1152 - [`array::IntoIter`]
1153 - [`panic::panic_any`]
1155 - [`ptr::addr_of_mut!`]
1156 - [`slice::fill_with`]
1157 - [`slice::split_inclusive_mut`]
1158 - [`slice::split_inclusive`]
1159 - [`slice::strip_prefix`]
1160 - [`slice::strip_suffix`]
1161 - [`str::split_inclusive`]
1162 - [`sync::OnceState`]
1164 - [`VecDeque::range`]
1165 - [`VecDeque::range_mut`]
1169 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1170 codegen option.][cargo/9112]
1171 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1172 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1173 to avoid unifying features of dependencies where that unification could be unwanted.
1174 Such as using the same dependency with a `std` feature in a build scripts and
1175 proc-macros, while using the `no-std` feature in the final binary. See the
1176 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1181 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1182 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1183 documentation.][79642]
1185 Various improvements to intra-doc links:
1187 - [You can link to non-path primitives such as `slice`.][80181]
1188 - [You can link to associated items.][74489]
1189 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1193 - [You can now pass `--include-ignored` to tests (e.g. with
1194 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1199 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1200 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1202 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1203 for the distributed artifacts.][81521]
1204 - `armv5te-unknown-linux-gnueabi`
1205 - `sparc64-unknown-linux-gnu`
1206 - `thumbv7neon-unknown-linux-gnueabihf`
1207 - `armv7-unknown-linux-gnueabi`
1208 - `x86_64-unknown-linux-gnux32`
1209 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1214 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1216 [79135]: https://github.com/rust-lang/rust/pull/79135
1217 [74489]: https://github.com/rust-lang/rust/pull/74489
1218 [76934]: https://github.com/rust-lang/rust/pull/76934
1219 [79570]: https://github.com/rust-lang/rust/pull/79570
1220 [80181]: https://github.com/rust-lang/rust/pull/80181
1221 [79642]: https://github.com/rust-lang/rust/pull/79642
1222 [80945]: https://github.com/rust-lang/rust/pull/80945
1223 [80279]: https://github.com/rust-lang/rust/pull/80279
1224 [80053]: https://github.com/rust-lang/rust/pull/80053
1225 [79502]: https://github.com/rust-lang/rust/pull/79502
1226 [75180]: https://github.com/rust-lang/rust/pull/75180
1227 [79135]: https://github.com/rust-lang/rust/pull/79135
1228 [81521]: https://github.com/rust-lang/rust/pull/81521
1229 [80968]: https://github.com/rust-lang/rust/pull/80968
1230 [80959]: https://github.com/rust-lang/rust/pull/80959
1231 [80718]: https://github.com/rust-lang/rust/pull/80718
1232 [80653]: https://github.com/rust-lang/rust/pull/80653
1233 [80579]: https://github.com/rust-lang/rust/pull/80579
1234 [79998]: https://github.com/rust-lang/rust/pull/79998
1235 [78044]: https://github.com/rust-lang/rust/pull/78044
1236 [81455]: https://github.com/rust-lang/rust/pull/81455
1237 [80764]: https://github.com/rust-lang/rust/pull/80764
1238 [80749]: https://github.com/rust-lang/rust/pull/80749
1239 [80662]: https://github.com/rust-lang/rust/pull/80662
1240 [79134]: https://github.com/rust-lang/rust/pull/79134
1241 [80966]: https://github.com/rust-lang/rust/pull/80966
1242 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1243 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1244 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1245 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1246 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1247 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1248 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1249 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1250 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1251 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1252 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1253 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1254 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1255 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1256 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1257 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1258 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1259 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1260 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1261 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1262 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1263 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1264 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1266 Version 1.50.0 (2021-02-11)
1267 ============================
1270 -----------------------
1271 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1272 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1273 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1276 -----------------------
1277 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1278 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1279 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1280 - [Dropped support for all cloudabi targets.][78439]
1282 \* Refer to Rust's [platform support page][platform-support-doc] for more
1283 information on Rust's tiered platform support.
1286 -----------------------
1288 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1289 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1290 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1291 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1292 up the same amount of space as `File`.
1298 - [`btree_map::Entry::or_insert_with_key`]
1301 - [`hash_map::Entry::or_insert_with_key`]
1305 - [`UnsafeCell::get_mut`]
1307 The following previously stable methods are now `const`.
1309 - [`IpAddr::is_ipv4`]
1310 - [`IpAddr::is_ipv6`]
1311 - [`IpAddr::is_unspecified`]
1312 - [`IpAddr::is_loopback`]
1313 - [`IpAddr::is_multicast`]
1314 - [`Ipv4Addr::octets`]
1315 - [`Ipv4Addr::is_loopback`]
1316 - [`Ipv4Addr::is_private`]
1317 - [`Ipv4Addr::is_link_local`]
1318 - [`Ipv4Addr::is_multicast`]
1319 - [`Ipv4Addr::is_broadcast`]
1320 - [`Ipv4Addr::is_documentation`]
1321 - [`Ipv4Addr::to_ipv6_compatible`]
1322 - [`Ipv4Addr::to_ipv6_mapped`]
1323 - [`Ipv6Addr::segments`]
1324 - [`Ipv6Addr::is_unspecified`]
1325 - [`Ipv6Addr::is_loopback`]
1326 - [`Ipv6Addr::is_multicast`]
1327 - [`Ipv6Addr::to_ipv4`]
1330 - [`Layout::from_size_align`]
1331 - `pow` for all integer types.
1332 - `checked_pow` for all integer types.
1333 - `saturating_pow` for all integer types.
1334 - `wrapping_pow` for all integer types.
1335 - `next_power_of_two` for all unsigned integer types.
1336 - `checked_next_power_of_two` for all unsigned integer types.
1339 -----------------------
1341 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1342 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1343 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1344 contents of that directory for changes.][cargo/8973]
1345 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1350 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1351 - [Running tests will now print the total time taken to execute.][75752]
1356 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1357 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1358 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1359 unhygenic `macro_rules!` macros.][79472]
1360 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1361 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1362 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1363 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1364 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1365 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1367 [74989]: https://github.com/rust-lang/rust/pull/74989
1368 [79261]: https://github.com/rust-lang/rust/pull/79261
1369 [79896]: https://github.com/rust-lang/rust/pull/79896
1370 [79484]: https://github.com/rust-lang/rust/pull/79484
1371 [79472]: https://github.com/rust-lang/rust/pull/79472
1372 [79270]: https://github.com/rust-lang/rust/pull/79270
1373 [79003]: https://github.com/rust-lang/rust/pull/79003
1374 [78864]: https://github.com/rust-lang/rust/pull/78864
1375 [78636]: https://github.com/rust-lang/rust/pull/78636
1376 [78439]: https://github.com/rust-lang/rust/pull/78439
1377 [78343]: https://github.com/rust-lang/rust/pull/78343
1378 [78296]: https://github.com/rust-lang/rust/pull/78296
1379 [78068]: https://github.com/rust-lang/rust/pull/78068
1380 [75752]: https://github.com/rust-lang/rust/pull/75752
1381 [74699]: https://github.com/rust-lang/rust/pull/74699
1382 [78142]: https://github.com/rust-lang/rust/pull/78142
1383 [77484]: https://github.com/rust-lang/rust/pull/77484
1384 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1385 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1386 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1387 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1388 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1389 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1390 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1391 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1392 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1393 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1394 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1395 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1396 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1397 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1398 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1399 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1400 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1401 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1402 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1403 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1404 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1405 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1406 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1407 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1408 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1409 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1410 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1411 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1412 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1413 [`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
1414 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1415 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1416 [`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
1417 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1420 Version 1.49.0 (2020-12-31)
1421 ============================
1424 -----------------------
1426 - [Unions can now implement `Drop`, and you can now have a field in a union
1427 with `ManuallyDrop<T>`.][77547]
1428 - [You can now cast uninhabited enums to integers.][76199]
1429 - [You can now bind by reference and by move in patterns.][76119] This
1430 allows you to selectively borrow individual components of a type. E.g.
1438 let person = Person {
1439 name: String::from("Alice"),
1443 // `name` is moved out of person, but `age` is referenced.
1444 let Person { name, ref age } = person;
1445 println!("{} {}", name, age);
1449 -----------------------
1451 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1452 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1453 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1454 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1455 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1456 - [Output from threads spawned in tests is now captured.][78227]
1457 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1459 \* Refer to Rust's [platform support page][platform-support-doc] for more
1460 information on Rust's tiered platform support.
1463 -----------------------
1465 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1466 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1471 - [`slice::select_nth_unstable`]
1472 - [`slice::select_nth_unstable_by`]
1473 - [`slice::select_nth_unstable_by_key`]
1475 The following previously stable methods are now `const`.
1477 - [`Poll::is_ready`]
1478 - [`Poll::is_pending`]
1481 -----------------------
1482 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1483 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1484 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1485 variable will be set if the crate being built is one the user selected to build, either
1486 with `-p` or through defaults.
1487 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1493 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1494 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1495 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1496 Previously such invalid or unused attributes could be ignored.
1497 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1498 read [this post about the changes][rustdoc-ws-post] for more details.
1499 - [Trait bounds are no longer inferred for associated types.][79904]
1503 These changes provide no direct user facing benefits, but represent significant
1504 improvements to the internals and overall performance of rustc and
1507 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1508 Local Storage model.][78201]
1509 - [Calculate visibilities once in resolve.][78077]
1510 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1511 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1514 [75991]: https://github.com/rust-lang/rust/pull/75991
1515 [78951]: https://github.com/rust-lang/rust/pull/78951
1516 [78848]: https://github.com/rust-lang/rust/pull/78848
1517 [78746]: https://github.com/rust-lang/rust/pull/78746
1518 [78376]: https://github.com/rust-lang/rust/pull/78376
1519 [78228]: https://github.com/rust-lang/rust/pull/78228
1520 [78227]: https://github.com/rust-lang/rust/pull/78227
1521 [78201]: https://github.com/rust-lang/rust/pull/78201
1522 [78109]: https://github.com/rust-lang/rust/pull/78109
1523 [78077]: https://github.com/rust-lang/rust/pull/78077
1524 [77997]: https://github.com/rust-lang/rust/pull/77997
1525 [77703]: https://github.com/rust-lang/rust/pull/77703
1526 [77547]: https://github.com/rust-lang/rust/pull/77547
1527 [77015]: https://github.com/rust-lang/rust/pull/77015
1528 [76199]: https://github.com/rust-lang/rust/pull/76199
1529 [76119]: https://github.com/rust-lang/rust/pull/76119
1530 [75914]: https://github.com/rust-lang/rust/pull/75914
1531 [79004]: https://github.com/rust-lang/rust/pull/79004
1532 [78676]: https://github.com/rust-lang/rust/pull/78676
1533 [79904]: https://github.com/rust-lang/rust/issues/79904
1534 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1535 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1536 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1537 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1538 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1539 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1540 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1541 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1542 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1543 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1544 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1546 Version 1.48.0 (2020-11-19)
1547 ==========================
1552 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1553 is still rejected *semantically*, but can now be parsed by procedural macros.
1557 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1558 `rustc` whether to link its own C runtime and libraries or to rely on a external
1559 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1560 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1561 Note: If you're using cargo you must explicitly pass the `--target` flag.
1562 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1564 \* Refer to Rust's [platform support page][platform-support-doc] for more
1565 information on Rust's tiered platform support.
1569 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1570 and `&Stderr`.][76275]
1571 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1572 - [The `matches!` macro now supports having a trailing comma.][74880]
1573 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1574 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1578 - [`slice::as_ptr_range`]
1579 - [`slice::as_mut_ptr_range`]
1580 - [`VecDeque::make_contiguous`]
1581 - [`future::pending`]
1584 The following previously stable methods are now `const fn`'s:
1586 - [`Option::is_some`]
1587 - [`Option::is_none`]
1588 - [`Option::as_ref`]
1590 - [`Result::is_err`]
1591 - [`Result::as_ref`]
1592 - [`Ordering::reverse`]
1593 - [`Ordering::then`]
1600 - [You can now link to items in `rustdoc` using the intra-doc link
1601 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1602 a link to `std::future`'s documentation. See ["Linking to items by
1603 name"][intradoc-links] for more information.
1604 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1605 when searching through `rustdoc`'s UI.][75740]
1609 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1610 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1611 promoted to `'static` lifetime any more inside `const fn`s.
1612 - [Associated type bindings on trait objects are now verified to meet the bounds
1613 declared on the trait when checking that they implement the trait.][27675]
1614 - [When trait bounds on associated types or opaque types are ambiguous, the
1615 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1616 - [Fixed recursive nonterminals not being expanded in macros during
1617 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1618 correctly handling recursive nonterminal tokens.
1619 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1620 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1621 in places where they have no effect.][73461]
1622 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1623 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1624 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1625 disallow zero-initialization.][71274]
1626 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1627 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1628 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1629 see the [`catch_unwind`] documentation for further information.
1635 These changes provide no direct user facing benefits, but represent significant
1636 improvements to the internals and overall performance of rustc and
1639 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1640 You can continue building with `make` by setting `ninja=false` in
1642 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1643 - [Made `ensure_sufficient_stack()` non-generic][76680]
1645 [78143]: https://github.com/rust-lang/rust/issues/78143
1646 [76680]: https://github.com/rust-lang/rust/pull/76680/
1647 [76030]: https://github.com/rust-lang/rust/pull/76030/
1648 [70212]: https://github.com/rust-lang/rust/pull/70212/
1649 [27675]: https://github.com/rust-lang/rust/issues/27675/
1650 [54121]: https://github.com/rust-lang/rust/issues/54121/
1651 [71274]: https://github.com/rust-lang/rust/pull/71274/
1652 [77386]: https://github.com/rust-lang/rust/pull/77386/
1653 [77153]: https://github.com/rust-lang/rust/pull/77153/
1654 [77055]: https://github.com/rust-lang/rust/pull/77055/
1655 [76275]: https://github.com/rust-lang/rust/pull/76275/
1656 [76310]: https://github.com/rust-lang/rust/pull/76310/
1657 [76420]: https://github.com/rust-lang/rust/pull/76420/
1658 [76158]: https://github.com/rust-lang/rust/pull/76158/
1659 [75857]: https://github.com/rust-lang/rust/pull/75857/
1660 [75585]: https://github.com/rust-lang/rust/pull/75585/
1661 [75740]: https://github.com/rust-lang/rust/pull/75740/
1662 [75502]: https://github.com/rust-lang/rust/pull/75502/
1663 [74880]: https://github.com/rust-lang/rust/pull/74880/
1664 [74922]: https://github.com/rust-lang/rust/pull/74922/
1665 [74430]: https://github.com/rust-lang/rust/pull/74430/
1666 [74194]: https://github.com/rust-lang/rust/pull/74194/
1667 [73461]: https://github.com/rust-lang/rust/pull/73461/
1668 [73166]: https://github.com/rust-lang/rust/pull/73166/
1669 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1670 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1671 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1672 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1673 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1674 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1675 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1676 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1677 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1678 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1679 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1680 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1681 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1682 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1683 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1686 Version 1.47.0 (2020-10-08)
1687 ==========================
1691 - [Closures will now warn when not used.][74869]
1695 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1696 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1698 - [Upgraded to LLVM 11.][73526]
1699 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1700 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1701 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1703 \* Refer to Rust's [platform support page][platform-support-doc] for more
1704 information on Rust's tiered platform support.
1708 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1709 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1710 those of length less than 33.][74060]
1711 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1712 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1713 `PartialEq`, and `PartialOrd`.][73583]
1717 - [`Ident::new_raw`]
1718 - [`Range::is_empty`]
1719 - [`RangeInclusive::is_empty`]
1720 - [`Result::as_deref`]
1721 - [`Result::as_deref_mut`]
1723 - [`pointer::offset_from`]
1727 The following previously stable APIs have now been made const.
1729 - [The `new` method for all `NonZero` integers.][73858]
1730 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1731 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1732 methods for all integers.][73858]
1733 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1734 signed integers.][73858]
1735 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1736 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1737 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1738 `is_ascii_control` methods for `char` and `u8`.][73858]
1742 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1743 You can override this by setting the following in your `Cargo.toml`.
1745 [profile.release.build-override]
1748 - [`cargo-help` will now display man pages for commands rather just the
1749 `--help` text.][cargo/8456]
1750 - [`cargo-metadata` now emits a `test` field indicating if a target has
1751 tests enabled.][cargo/8478]
1752 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1753 - [`cargo-publish` will now use an alternative registry by default if it's the
1754 only registry specified in `package.publish`.][cargo/8571]
1758 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1759 type based search.][75366]
1760 - [Added the Ayu theme to rustdoc.][71237]
1764 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1765 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1766 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1767 help to preserve more span information.][73084] These changes may cause
1768 compiliation errors if your macro was unhygenic or didn't correctly handle
1770 - [Moved support for the CloudABI target to tier 3.][75568]
1771 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1772 - [Added the `rustc-docs` component.][75560] This allows you to install
1773 and read the documentation for the compiler internal APIs. (Currently only
1774 available for `x86_64-unknown-linux-gnu`.)
1779 - [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.
1781 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1782 [75048]: https://github.com/rust-lang/rust/pull/75048/
1783 [74163]: https://github.com/rust-lang/rust/pull/74163/
1784 [71237]: https://github.com/rust-lang/rust/pull/71237/
1785 [74869]: https://github.com/rust-lang/rust/pull/74869/
1786 [73858]: https://github.com/rust-lang/rust/pull/73858/
1787 [75716]: https://github.com/rust-lang/rust/pull/75716/
1788 [75908]: https://github.com/rust-lang/rust/pull/75908/
1789 [75516]: https://github.com/rust-lang/rust/pull/75516/
1790 [75560]: https://github.com/rust-lang/rust/pull/75560/
1791 [75568]: https://github.com/rust-lang/rust/pull/75568/
1792 [75366]: https://github.com/rust-lang/rust/pull/75366/
1793 [75204]: https://github.com/rust-lang/rust/pull/75204/
1794 [74650]: https://github.com/rust-lang/rust/pull/74650/
1795 [74419]: https://github.com/rust-lang/rust/pull/74419/
1796 [73964]: https://github.com/rust-lang/rust/pull/73964/
1797 [74021]: https://github.com/rust-lang/rust/pull/74021/
1798 [74060]: https://github.com/rust-lang/rust/pull/74060/
1799 [73893]: https://github.com/rust-lang/rust/pull/73893/
1800 [73526]: https://github.com/rust-lang/rust/pull/73526/
1801 [73583]: https://github.com/rust-lang/rust/pull/73583/
1802 [73084]: https://github.com/rust-lang/rust/pull/73084/
1803 [73197]: https://github.com/rust-lang/rust/pull/73197/
1804 [72488]: https://github.com/rust-lang/rust/pull/72488/
1805 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1806 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1807 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1808 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1809 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1810 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1811 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1812 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1813 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1814 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1815 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1816 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1817 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1818 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1819 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1822 Version 1.46.0 (2020-08-27)
1823 ==========================
1827 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1828 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1829 const functions.][73862]
1830 - [The `#[track_caller]` attribute can now be added to functions to use the
1831 function's caller's location information for panic messages.][72445]
1832 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1833 `x.0.0` over `(x.0).0`.
1834 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1835 You currently can't use `mem::transmute` in constant functions.
1839 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1840 - [Enabled static "Position Independent Executables" by default
1841 for `x86_64-unknown-linux-musl`.][70740]
1845 - [`mem::forget` is now a `const fn`.][73887]
1846 - [`String` now implements `From<char>`.][73466]
1847 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1848 integer types.][73032]
1849 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1850 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1851 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1852 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1853 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1854 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1859 - [`vec::Drain::as_slice`]
1863 Added a number of new environment variables that are now available when
1864 compiling your crate.
1866 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1867 the specific binary being compiled and the name of the crate.
1868 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1869 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1873 - [The target configuration option `abi_blacklist` has been renamed
1874 to `unsupported_abis`.][74150] The old name will still continue to work.
1875 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1876 This was previously accepted but will become a hard error in a future release.
1877 - [Rustc will fail to compile if you have a struct with
1878 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1880 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1881 ensure that spans have the correct information, and may cause breakage if you
1882 were relying on receiving spans with dummy information.
1883 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1884 a legacy installer that was replaced by a MSI installer a few years ago but
1885 was still being built.
1886 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1887 - [Rustc will no longer accept overlapping trait implementations that only
1888 differ in how the lifetime was bound.][72493]
1889 - [Rustc now correctly relates the lifetime of an existential associated
1890 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1891 you to pass a shorter lifetime than expected.
1892 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1893 The library will need to be installed for `rustc` to work, even though we
1894 expect it to be already available on most systems.
1895 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1897 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1898 exact output returned by rustc's pretty printing is an unstable
1899 implementation detail: we recommend any macro relying on it to switch to a
1900 more robust parsing system.
1902 [75453]: https://github.com/rust-lang/rust/issues/75453/
1903 [74820]: https://github.com/rust-lang/rust/issues/74820/
1904 [74420]: https://github.com/rust-lang/rust/issues/74420/
1905 [74109]: https://github.com/rust-lang/rust/pull/74109/
1906 [74150]: https://github.com/rust-lang/rust/pull/74150/
1907 [73862]: https://github.com/rust-lang/rust/pull/73862/
1908 [73887]: https://github.com/rust-lang/rust/pull/73887/
1909 [73466]: https://github.com/rust-lang/rust/pull/73466/
1910 [73516]: https://github.com/rust-lang/rust/pull/73516/
1911 [73293]: https://github.com/rust-lang/rust/pull/73293/
1912 [73007]: https://github.com/rust-lang/rust/pull/73007/
1913 [73032]: https://github.com/rust-lang/rust/pull/73032/
1914 [72920]: https://github.com/rust-lang/rust/pull/72920/
1915 [72569]: https://github.com/rust-lang/rust/pull/72569/
1916 [72583]: https://github.com/rust-lang/rust/pull/72583/
1917 [72584]: https://github.com/rust-lang/rust/pull/72584/
1918 [72717]: https://github.com/rust-lang/rust/pull/72717/
1919 [72437]: https://github.com/rust-lang/rust/pull/72437/
1920 [72445]: https://github.com/rust-lang/rust/pull/72445/
1921 [72486]: https://github.com/rust-lang/rust/pull/72486/
1922 [72493]: https://github.com/rust-lang/rust/pull/72493/
1923 [72331]: https://github.com/rust-lang/rust/pull/72331/
1924 [71896]: https://github.com/rust-lang/rust/pull/71896/
1925 [71660]: https://github.com/rust-lang/rust/pull/71660/
1926 [71322]: https://github.com/rust-lang/rust/pull/71322/
1927 [70740]: https://github.com/rust-lang/rust/pull/70740/
1928 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1929 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1930 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1931 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1932 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1935 Version 1.45.2 (2020-08-03)
1936 ==========================
1938 * [Fix bindings in tuple struct patterns][74954]
1939 * [Fix track_caller integration with trait objects][74784]
1941 [74954]: https://github.com/rust-lang/rust/issues/74954
1942 [74784]: https://github.com/rust-lang/rust/issues/74784
1945 Version 1.45.1 (2020-07-30)
1946 ==========================
1948 * [Fix const propagation with references.][73613]
1949 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1950 * [Avoid spurious implicit region bound.][74509]
1951 * [Install clippy on x.py install][74457]
1953 [73613]: https://github.com/rust-lang/rust/pull/73613
1954 [73078]: https://github.com/rust-lang/rust/issues/73078
1955 [74509]: https://github.com/rust-lang/rust/pull/74509
1956 [74457]: https://github.com/rust-lang/rust/pull/74457
1959 Version 1.45.0 (2020-07-16)
1960 ==========================
1964 - [Out of range float to int conversions using `as` has been defined as a saturating
1965 conversion.][71269] This was previously undefined behaviour, but you can use the
1966 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1967 may be desirable in rare performance sensitive situations.
1968 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1969 using `u64`.][70705]
1970 - [Function like procedural macros can now be used in expression, pattern, and statement
1971 positions.][68717] This means you can now use a function-like procedural macro
1972 anywhere you can use a declarative (`macro_rules!`) macro.
1976 - [You can now override individual target features through the `target-feature`
1977 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1978 equivalent to `-C target-feature=+avx2,+fma`.
1979 - [Added the `force-unwind-tables` flag.][69984] This option allows
1980 rustc to always generate unwind tables regardless of panic strategy.
1981 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1982 to include LLVM bitcode into generated `rlib`s (this is on by default).
1983 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1984 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1985 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1986 - [Upgraded to LLVM 10.][67759]
1988 \* Refer to Rust's [platform support page][platform-support-doc] for more
1989 information on Rust's tiered platform support.
1994 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1996 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1997 - [You can now use `char` with
1998 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1999 a range of codepoints.][72413] E.g.
2000 you can now write the following;
2002 for ch in 'a'..='z' {
2006 // Prints "abcdefghijklmnopqrstuvwxyz"
2008 - [`OsString` now implements `FromStr`.][71662]
2009 - [The `saturating_neg` method has been added to all signed integer primitive
2010 types, and the `saturating_abs` method has been added for all integer
2011 primitive types.][71886]
2012 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2013 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2015 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2016 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2017 integer types.][69813]
2018 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2019 integer types.][72324]
2020 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2025 - [`BTreeMap::remove_entry`]
2027 - [`rc::Weak::as_ptr`]
2028 - [`rc::Weak::from_raw`]
2029 - [`rc::Weak::into_raw`]
2030 - [`str::strip_prefix`]
2031 - [`str::strip_suffix`]
2032 - [`sync::Weak::as_ptr`]
2033 - [`sync::Weak::from_raw`]
2034 - [`sync::Weak::into_raw`]
2035 - [`char::UNICODE_VERSION`]
2036 - [`Span::resolved_at`]
2037 - [`Span::located_at`]
2038 - [`Span::mixed_site`]
2039 - [`unix::process::CommandExt::arg0`]
2044 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2049 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2050 `~~outdated information~~` becomes "~~outdated information~~".
2051 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2055 - [Trying to self initialize a static value (that is creating a value using
2056 itself) is unsound and now causes a compile error.][71140]
2057 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2058 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2059 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2060 previously undocumented and not intended for public use. Rustdoc still provides
2061 a non-zero exit code on errors.
2062 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2063 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2064 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2065 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2066 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2070 - [Make clippy a git subtree instead of a git submodule][70655]
2071 - [Unify the undo log of all snapshot types][69464]
2073 [71848]: https://github.com/rust-lang/rust/issues/71848/
2074 [73420]: https://github.com/rust-lang/rust/issues/73420/
2075 [72324]: https://github.com/rust-lang/rust/pull/72324/
2076 [71843]: https://github.com/rust-lang/rust/pull/71843/
2077 [71886]: https://github.com/rust-lang/rust/pull/71886/
2078 [72234]: https://github.com/rust-lang/rust/pull/72234/
2079 [72239]: https://github.com/rust-lang/rust/pull/72239/
2080 [72397]: https://github.com/rust-lang/rust/pull/72397/
2081 [72413]: https://github.com/rust-lang/rust/pull/72413/
2082 [72014]: https://github.com/rust-lang/rust/pull/72014/
2083 [72062]: https://github.com/rust-lang/rust/pull/72062/
2084 [72094]: https://github.com/rust-lang/rust/pull/72094/
2085 [72133]: https://github.com/rust-lang/rust/pull/72133/
2086 [67759]: https://github.com/rust-lang/rust/pull/67759/
2087 [71900]: https://github.com/rust-lang/rust/pull/71900/
2088 [71928]: https://github.com/rust-lang/rust/pull/71928/
2089 [71662]: https://github.com/rust-lang/rust/pull/71662/
2090 [71716]: https://github.com/rust-lang/rust/pull/71716/
2091 [71447]: https://github.com/rust-lang/rust/pull/71447/
2092 [71269]: https://github.com/rust-lang/rust/pull/71269/
2093 [71095]: https://github.com/rust-lang/rust/pull/71095/
2094 [71140]: https://github.com/rust-lang/rust/pull/71140/
2095 [70655]: https://github.com/rust-lang/rust/pull/70655/
2096 [70705]: https://github.com/rust-lang/rust/pull/70705/
2097 [69984]: https://github.com/rust-lang/rust/pull/69984/
2098 [69813]: https://github.com/rust-lang/rust/pull/69813/
2099 [69464]: https://github.com/rust-lang/rust/pull/69464/
2100 [68717]: https://github.com/rust-lang/rust/pull/68717/
2101 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2102 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2103 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2104 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2105 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2106 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2107 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2108 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2109 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2110 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2111 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2112 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2113 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2114 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2115 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2116 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2117 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2120 Version 1.44.1 (2020-06-18)
2121 ===========================
2123 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2124 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2125 * [Fix crashes when finding backtrace on macOS.][71397]
2126 * [Clippy applies lint levels into different files.][clippy/5356]
2128 [71397]: https://github.com/rust-lang/rust/issues/71397
2129 [73078]: https://github.com/rust-lang/rust/issues/73078
2130 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2131 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2134 Version 1.44.0 (2020-06-04)
2135 ==========================
2139 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2140 - [Added the `unused_braces` lint.][70081]
2142 **Syntax-only changes**
2144 - [Expansion-driven outline module parsing][69838]
2149 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2154 These are still rejected semantically, so you will likely receive an error but
2155 these changes can be seen and parsed by macros and conditional compilation.
2159 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2160 Additionally when in incremental mode rustc defaults to 256 codegen units.
2161 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2162 a panic is thrown.][67502]
2163 - [Added tier 3\* support for the `aarch64-unknown-none` and
2164 `aarch64-unknown-none-softfloat` targets.][68334]
2165 - [Added tier 3 support for `arm64-apple-tvos` and
2166 `x86_64-apple-tvos` targets.][68191]
2171 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2172 `vec![]` to be able to be used in `const` contexts.
2173 - [`convert::Infallible` now implements `Hash`.][70281]
2174 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2175 a `&mut OsStr`.][70048]
2176 - [Unicode 13 is now supported.][69929]
2177 - [`String` now implements `From<&mut str>`.][69661]
2178 - [`IoSlice` now implements `Copy`.][69403]
2179 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2180 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2181 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2182 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2183 integer types.][69373]
2187 - [`PathBuf::with_capacity`]
2188 - [`PathBuf::capacity`]
2189 - [`PathBuf::clear`]
2190 - [`PathBuf::reserve`]
2191 - [`PathBuf::reserve_exact`]
2192 - [`PathBuf::shrink_to_fit`]
2193 - [`f32::to_int_unchecked`]
2194 - [`f64::to_int_unchecked`]
2195 - [`Layout::align_to`]
2196 - [`Layout::pad_to_align`]
2198 - [`Layout::extend`]
2202 - [Added the `cargo tree` command which will print a tree graph of
2203 your dependencies.][cargo/8062] E.g.
2205 mdbook v0.3.2 (/Users/src/rust/mdbook)
2207 │ ├── html5ever v0.24.0
2209 │ │ │ └── cfg-if v0.1.9
2211 │ │ └── markup5ever v0.9.0
2212 │ │ ├── log v0.4.8 (*)
2214 │ │ │ └── phf_shared v0.7.24
2215 │ │ │ ├── siphasher v0.2.3
2216 │ │ │ └── unicase v1.4.2
2217 │ │ │ [build-dependencies]
2218 │ │ │ └── version_check v0.1.5
2221 You can also display dependencies on multiple versions of the same crate with
2222 `cargo tree -d` (short for `cargo tree --duplicates`).
2226 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2227 the version in the sidebar.][69494]
2231 - [Rustc now correctly generates static libraries on Windows GNU targets with
2232 the `.a` extension, rather than the previous `.lib`.][70937]
2233 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2234 - [The `file_name` property in JSON output of macro errors now points the actual
2235 source file rather than the previous format of `<NAME macros>`.][70969]
2236 **Note:** this may not point to a file that actually exists on the user's system.
2237 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2238 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2239 not allow zero initialization such as `NonZeroU8`.][66059] This was
2240 previously a warning.
2241 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2242 operator has been defined as a saturating operation.][71269] This was previously
2243 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2244 continue using the current behaviour, which may be desirable in rare performance
2245 sensitive situations.
2249 These changes provide no direct user facing benefits, but represent significant
2250 improvements to the internals and overall performance of rustc and
2253 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2254 - [Replace big JS dict with JSON parsing.][71250]
2256 [69373]: https://github.com/rust-lang/rust/pull/69373/
2257 [66059]: https://github.com/rust-lang/rust/pull/66059/
2258 [68191]: https://github.com/rust-lang/rust/pull/68191/
2259 [68899]: https://github.com/rust-lang/rust/pull/68899/
2260 [71147]: https://github.com/rust-lang/rust/pull/71147/
2261 [71250]: https://github.com/rust-lang/rust/pull/71250/
2262 [70937]: https://github.com/rust-lang/rust/pull/70937/
2263 [70969]: https://github.com/rust-lang/rust/pull/70969/
2264 [70632]: https://github.com/rust-lang/rust/pull/70632/
2265 [70281]: https://github.com/rust-lang/rust/pull/70281/
2266 [70345]: https://github.com/rust-lang/rust/pull/70345/
2267 [70048]: https://github.com/rust-lang/rust/pull/70048/
2268 [70081]: https://github.com/rust-lang/rust/pull/70081/
2269 [70156]: https://github.com/rust-lang/rust/pull/70156/
2270 [71269]: https://github.com/rust-lang/rust/pull/71269/
2271 [69838]: https://github.com/rust-lang/rust/pull/69838/
2272 [69929]: https://github.com/rust-lang/rust/pull/69929/
2273 [69661]: https://github.com/rust-lang/rust/pull/69661/
2274 [69778]: https://github.com/rust-lang/rust/pull/69778/
2275 [69494]: https://github.com/rust-lang/rust/pull/69494/
2276 [69403]: https://github.com/rust-lang/rust/pull/69403/
2277 [69033]: https://github.com/rust-lang/rust/pull/69033/
2278 [68692]: https://github.com/rust-lang/rust/pull/68692/
2279 [68334]: https://github.com/rust-lang/rust/pull/68334/
2280 [67502]: https://github.com/rust-lang/rust/pull/67502/
2281 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2282 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2283 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2284 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2285 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2286 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2287 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2288 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2289 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2290 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2291 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2292 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2293 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2296 Version 1.43.1 (2020-05-07)
2297 ===========================
2299 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2300 * [Fixed the stabilization of AVX-512 features.][71473]
2301 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2303 [71430]: https://github.com/rust-lang/rust/pull/71430
2304 [71473]: https://github.com/rust-lang/rust/issues/71473
2305 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2308 Version 1.43.0 (2020-04-23)
2309 ==========================
2313 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2314 the type inferred correctly.][68129]
2315 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2317 **Syntax only changes**
2318 - [Allow `type Foo: Ord` syntactically.][69361]
2319 - [Fuse associated and extern items up to defaultness.][69194]
2320 - [Syntactically allow `self` in all `fn` contexts.][68764]
2321 - [Merge `fn` syntax + cleanup item parsing.][68728]
2322 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2323 For example, you may now write:
2325 macro_rules! mac_trait {
2335 These are still rejected *semantically*, so you will likely receive an error but
2336 these changes can be seen and parsed by macros and
2337 conditional compilation.
2342 - [You can now pass multiple lint flags to rustc to override the previous
2343 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2344 everything in the `unused` lint group except `unused-variables` which
2345 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2346 everything in the `unused` lint group **including** `unused-variables` since
2347 the allow flag is specified before the deny flag (and therefore overridden).
2348 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2349 if they are available on `windows-gnu`.][67429]
2350 - [rustc now buffers errors/warnings printed in JSON.][69227]
2354 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2355 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2356 respectively.][69538] **Note** These conversions are only available when `N`
2358 - [You can now use associated constants on floats and integers directly, rather
2359 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2360 `f32::NAN` with no imports.
2361 - [`u8::is_ascii` is now `const`.][68984]
2362 - [`String` now implements `AsMut<str>`.][68742]
2363 - [Added the `primitive` module to `std` and `core`.][67637] This module
2364 reexports Rust's primitive types. This is mainly useful in macros
2365 where you want avoid these types being shadowed.
2366 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2367 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2371 - [`Once::is_completed`]
2376 - [`iter::once_with`]
2380 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2381 your environment.][cargo/7823]
2382 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2383 executable path when running integration tests or benchmarks.][cargo/7697]
2384 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2385 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2389 - [Certain checks in the `const_err` lint were deemed unrelated to const
2390 evaluation][69185], and have been moved to the `unconditional_panic` and
2391 `arithmetic_overflow` lints.
2396 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2397 has been a warning since 1.36.0.
2398 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2399 led to some instances being accepted, and now correctly emits a hard error.
2401 [69340]: https://github.com/rust-lang/rust/pull/69340
2405 These changes provide no direct user facing benefits, but represent significant
2406 improvements to the internals and overall performance of `rustc` and
2409 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2410 - [Improved how rustc generates drop code.][67332]
2411 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2412 - [traits: preallocate 2 Vecs of known initial size][69022]
2413 - [Avoid exponential behaviour when relating types][68772]
2414 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2415 - [Improve performance of coherence checks][68966]
2416 - [Deduplicate types in the generator witness][68672]
2417 - [Invert control in struct_lint_level.][68725]
2419 [67332]: https://github.com/rust-lang/rust/pull/67332/
2420 [67429]: https://github.com/rust-lang/rust/pull/67429/
2421 [67637]: https://github.com/rust-lang/rust/pull/67637/
2422 [67642]: https://github.com/rust-lang/rust/pull/67642/
2423 [67878]: https://github.com/rust-lang/rust/pull/67878/
2424 [67885]: https://github.com/rust-lang/rust/pull/67885/
2425 [68129]: https://github.com/rust-lang/rust/pull/68129/
2426 [68672]: https://github.com/rust-lang/rust/pull/68672/
2427 [68725]: https://github.com/rust-lang/rust/pull/68725/
2428 [68728]: https://github.com/rust-lang/rust/pull/68728/
2429 [68738]: https://github.com/rust-lang/rust/pull/68738/
2430 [68742]: https://github.com/rust-lang/rust/pull/68742/
2431 [68764]: https://github.com/rust-lang/rust/pull/68764/
2432 [68772]: https://github.com/rust-lang/rust/pull/68772/
2433 [68943]: https://github.com/rust-lang/rust/pull/68943/
2434 [68952]: https://github.com/rust-lang/rust/pull/68952/
2435 [68966]: https://github.com/rust-lang/rust/pull/68966/
2436 [68984]: https://github.com/rust-lang/rust/pull/68984/
2437 [69022]: https://github.com/rust-lang/rust/pull/69022/
2438 [69185]: https://github.com/rust-lang/rust/pull/69185/
2439 [69194]: https://github.com/rust-lang/rust/pull/69194/
2440 [69201]: https://github.com/rust-lang/rust/pull/69201/
2441 [69227]: https://github.com/rust-lang/rust/pull/69227/
2442 [69548]: https://github.com/rust-lang/rust/pull/69548/
2443 [69256]: https://github.com/rust-lang/rust/pull/69256/
2444 [69361]: https://github.com/rust-lang/rust/pull/69361/
2445 [69366]: https://github.com/rust-lang/rust/pull/69366/
2446 [69538]: https://github.com/rust-lang/rust/pull/69538/
2447 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2448 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2449 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2450 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2451 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2452 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2453 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2454 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2457 Version 1.42.0 (2020-03-12)
2458 ==========================
2462 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2464 fn foo(words: &[&str]) {
2466 ["Hello", "World", "!", ..] => println!("Hello World!"),
2467 ["Foo", "Bar", ..] => println!("Baz"),
2468 rest => println!("{:?}", rest),
2472 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2473 that you can create an enum that has the exact layout and ABI of the type
2475 - [You can now use outer attribute procedural macros on inline modules.][64273]
2476 - [There are some *syntax-only* changes:][67131]
2477 - `default` is syntactically allowed before items in `trait` definitions.
2478 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2479 leave out their bodies in favor of `;`.
2480 - Bounds on associated types in `impl`s are now syntactically allowed
2481 (e.g. `type Foo: Ord;`).
2482 - `...` (the C-variadic type) may occur syntactically directly as the type of
2483 any function parameter.
2485 These are still rejected *semantically*, so you will likely receive an error
2486 but these changes can be seen and parsed by procedural macros and
2487 conditional compilation.
2491 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2492 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2493 - [`Option::{expect,unwrap}` and
2494 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2495 pointing to the location where they were called, rather than
2496 `core`'s internals. ][67887]
2498 \* Refer to Rust's [platform support page][platform-support-doc] for more
2499 information on Rust's tiered platform support.
2503 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2504 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2505 to implement `Sized`.][67935]
2506 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2507 - [`Layout::new` is now `const`.][66254]
2508 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2513 - [`CondVar::wait_while`]
2514 - [`CondVar::wait_timeout_while`]
2516 - [`DebugMap::value`]
2517 - [`ManuallyDrop::take`]
2519 - [`ptr::slice_from_raw_parts_mut`]
2520 - [`ptr::slice_from_raw_parts`]
2524 - [You no longer need to include `extern crate proc_macro;` to be able to
2525 `use proc_macro;` in the `2018` edition.][cargo/7700]
2529 - [`Error::description` has been deprecated, and its use will now produce a
2530 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2532 [68253]: https://github.com/rust-lang/rust/pull/68253/
2533 [68348]: https://github.com/rust-lang/rust/pull/68348/
2534 [67935]: https://github.com/rust-lang/rust/pull/67935/
2535 [68339]: https://github.com/rust-lang/rust/pull/68339/
2536 [68122]: https://github.com/rust-lang/rust/pull/68122/
2537 [64273]: https://github.com/rust-lang/rust/pull/64273/
2538 [67712]: https://github.com/rust-lang/rust/pull/67712/
2539 [67887]: https://github.com/rust-lang/rust/pull/67887/
2540 [67131]: https://github.com/rust-lang/rust/pull/67131/
2541 [67233]: https://github.com/rust-lang/rust/pull/67233/
2542 [66899]: https://github.com/rust-lang/rust/pull/66899/
2543 [66919]: https://github.com/rust-lang/rust/pull/66919/
2544 [66254]: https://github.com/rust-lang/rust/pull/66254/
2545 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2546 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2547 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2548 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2549 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2550 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2551 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2552 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2553 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2556 Version 1.41.1 (2020-02-27)
2557 ===========================
2559 * [Always check types of static items][69145]
2560 * [Always check lifetime bounds of `Copy` impls][69145]
2561 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2563 [69225]: https://github.com/rust-lang/rust/issues/69225
2564 [69145]: https://github.com/rust-lang/rust/pull/69145
2567 Version 1.41.0 (2020-01-30)
2568 ===========================
2573 - [You can now pass type parameters to foreign items when implementing
2574 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2575 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2576 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2577 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2578 - [You can now use any valid identifier in a `format_args` macro.][66847]
2579 Previously identifiers starting with an underscore were not allowed.
2580 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2581 enum variants.][66183] These are still rejected semantically, but
2582 can be seen and parsed by procedural macros and conditional compilation.
2583 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2584 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2585 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2587 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2592 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2593 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2594 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2595 - [You can now pass an arguments file passing the `@path` syntax
2596 to rustc.][66172] Note that the format differs somewhat from what is
2597 found in other tooling; please see [the documentation][argfile-docs] for
2599 - [You can now provide `--extern` flag without a path, indicating that it is
2600 available from the search path or specified with an `-L` flag.][64882]
2602 \* Refer to Rust's [platform support page][platform-support-doc] for more
2603 information on Rust's tiered platform support.
2605 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2610 - [The `core::panic` module is now stable.][66771] It was already stable
2612 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2613 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2614 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2619 - [`Result::map_or`]
2620 - [`Result::map_or_else`]
2621 - [`std::rc::Weak::weak_count`]
2622 - [`std::rc::Weak::strong_count`]
2623 - [`std::sync::Weak::weak_count`]
2624 - [`std::sync::Weak::strong_count`]
2629 - [Cargo will now document all the private items for binary crates
2630 by default.][cargo/7593]
2631 - [`cargo-install` will now reinstall the package if it detects that it is out
2632 of date.][cargo/7560]
2633 - [Cargo.lock now uses a more git friendly format that should help to reduce
2634 merge conflicts.][cargo/7579]
2635 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2636 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2637 optimisation level to `2` for debug builds. You can also use
2638 `[profile.<profile>.build-override]` to override build scripts and
2644 - [You can now specify `edition` in documentation code blocks to compile the block
2645 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2646 should be compiled the 2018 edition of Rust.
2647 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2648 current theme with `--check-theme`.][54733]
2649 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2654 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2655 Apple targets.][apple-32bit-drop] This means that the source code is still
2656 available to build, but the targets are no longer being tested and release
2657 binaries for those platforms will no longer be distributed by the Rust project.
2658 Please refer to the linked blog post for more information.
2660 [54733]: https://github.com/rust-lang/rust/pull/54733/
2661 [61351]: https://github.com/rust-lang/rust/pull/61351/
2662 [62514]: https://github.com/rust-lang/rust/pull/62514/
2663 [67255]: https://github.com/rust-lang/rust/pull/67255/
2664 [66661]: https://github.com/rust-lang/rust/pull/66661/
2665 [66771]: https://github.com/rust-lang/rust/pull/66771/
2666 [66847]: https://github.com/rust-lang/rust/pull/66847/
2667 [66238]: https://github.com/rust-lang/rust/pull/66238/
2668 [66277]: https://github.com/rust-lang/rust/pull/66277/
2669 [66325]: https://github.com/rust-lang/rust/pull/66325/
2670 [66172]: https://github.com/rust-lang/rust/pull/66172/
2671 [66183]: https://github.com/rust-lang/rust/pull/66183/
2672 [65879]: https://github.com/rust-lang/rust/pull/65879/
2673 [65013]: https://github.com/rust-lang/rust/pull/65013/
2674 [64882]: https://github.com/rust-lang/rust/pull/64882/
2675 [64325]: https://github.com/rust-lang/rust/pull/64325/
2676 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2677 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2678 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2679 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2680 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2681 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2682 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2683 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2684 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2685 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2686 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2688 Version 1.40.0 (2019-12-19)
2689 ===========================
2693 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2694 `const` contexts.][65188] e.g.
2697 pub struct Point(i32, i32);
2699 const ORIGIN: Point = {
2700 let constructor = Point;
2706 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2707 indicate that there may be variants or fields added in the future.][64639]
2708 For example this requires adding a wild-card branch (`_ => {}`) to any match
2709 statements on a non-exhaustive `enum`. [(RFC 2008)]
2710 - [You can now use function-like procedural macros in `extern` blocks and in
2711 type positions.][63931] e.g. `type Generated = macro!();`
2712 - [Function-like and attribute procedural macros can now emit
2713 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2714 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2715 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2716 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2720 - [Added tier 3 support\* for the
2721 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2722 - [Added tier 3 support for the
2723 `aarch64-unknown-none-softfloat` target.][64589]
2724 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2725 `mips64el-unknown-linux-muslabi64` targets.][65843]
2727 \* Refer to Rust's [platform support page][platform-support-doc] for more
2728 information on Rust's tiered platform support.
2732 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2736 - [`BTreeMap::get_key_value`]
2737 - [`HashMap::get_key_value`]
2738 - [`Option::as_deref_mut`]
2739 - [`Option::as_deref`]
2740 - [`Option::flatten`]
2741 - [`UdpSocket::peer_addr`]
2742 - [`f32::to_be_bytes`]
2743 - [`f32::to_le_bytes`]
2744 - [`f32::to_ne_bytes`]
2745 - [`f64::to_be_bytes`]
2746 - [`f64::to_le_bytes`]
2747 - [`f64::to_ne_bytes`]
2748 - [`f32::from_be_bytes`]
2749 - [`f32::from_le_bytes`]
2750 - [`f32::from_ne_bytes`]
2751 - [`f64::from_be_bytes`]
2752 - [`f64::from_le_bytes`]
2753 - [`f64::from_ne_bytes`]
2760 - [Cargo will now always display warnings, rather than only on
2761 fresh builds.][cargo/7450]
2762 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2763 now produce an error.][cargo/7507] Previously these flags were ignored.
2764 - [You can now publish `dev-dependencies` without including
2765 a `version`.][cargo/7333]
2769 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2770 when running documentation tests with `rustdoc`.][63803]
2774 - [As previously announced, any previous NLL warnings in the 2015 edition are
2775 now hard errors.][64221]
2776 - [The `include!` macro will now warn if it failed to include the
2777 entire file.][64284] The `include!` macro unintentionally only includes the
2778 first _expression_ in a file, and this can be unintuitive. This will become
2779 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2780 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2781 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2782 or `extern` blocks now correctly emits a hard error.
2784 [65294]: https://github.com/rust-lang/rust/pull/65294/
2785 [66103]: https://github.com/rust-lang/rust/pull/66103/
2786 [65843]: https://github.com/rust-lang/rust/pull/65843/
2787 [65188]: https://github.com/rust-lang/rust/pull/65188/
2788 [65092]: https://github.com/rust-lang/rust/pull/65092/
2789 [64589]: https://github.com/rust-lang/rust/pull/64589/
2790 [64639]: https://github.com/rust-lang/rust/pull/64639/
2791 [64221]: https://github.com/rust-lang/rust/pull/64221/
2792 [64284]: https://github.com/rust-lang/rust/pull/64284/
2793 [63931]: https://github.com/rust-lang/rust/pull/63931/
2794 [64035]: https://github.com/rust-lang/rust/pull/64035/
2795 [63674]: https://github.com/rust-lang/rust/pull/63674/
2796 [63803]: https://github.com/rust-lang/rust/pull/63803/
2797 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2798 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2799 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2800 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2801 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2802 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2803 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2804 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2805 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2806 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2807 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2808 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2809 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2810 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2811 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2812 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2813 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2814 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2815 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2816 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2817 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2818 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2819 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2820 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2821 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2822 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2825 Version 1.39.0 (2019-11-07)
2826 ===========================
2830 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2831 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2832 - [You can now use certain attributes on function, closure, and function pointer
2833 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2834 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2835 attributes applied to items. e.g.
2838 #[cfg(windows)] slice: &[u16],
2839 #[cfg(not(windows))] slice: &[u8],
2844 - [You can now take shared references to bind-by-move patterns in the `if` guards
2845 of `match` arms.][63118] e.g.
2848 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2852 // ---- `nums` is bound by move.
2853 if nums.iter().sum::<u8>() == 10
2854 // ^------ `.iter()` implicitly takes a reference to `nums`.
2857 // ----------- Legal as `nums` was bound by move and so we have ownership.
2859 _ => unreachable!(),
2868 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2869 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2870 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2871 **Note** Cargo currently doesn't use this feature. Refer to
2872 [cargo#7315][cargo/7315] to track this feature's progress.
2873 - [You can now pass `--show-output` argument to test binaries to print the
2874 output of successful tests.][62600]
2877 \* Refer to Rust's [platform support page][platform-support-doc] for more
2878 information on Rust's tiered platform support.
2882 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2883 - [`LinkedList::new` is now a `const` function.][63684]
2884 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2885 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2886 now `const`.][63786]
2890 - [`Pin::into_inner`]
2891 - [`Instant::checked_duration_since`]
2892 - [`Instant::saturating_duration_since`]
2896 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2897 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2898 `--all` is now deprecated.
2902 - [You can now pass `-Clinker` to rustdoc to control the linker used
2903 for compiling doctests.][63834]
2907 - [Code that was previously accepted by the old borrow checker, but rejected by
2908 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2909 previously a warning, and will also become a hard error in the Rust 2015
2910 edition in the 1.40.0 release.
2911 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2912 run tests.][63827] This should improve performance when running a large
2914 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2915 recommended to use the `?` operator instead.
2916 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2919 [62600]: https://github.com/rust-lang/rust/pull/62600/
2920 [62672]: https://github.com/rust-lang/rust/pull/62672/
2921 [63118]: https://github.com/rust-lang/rust/pull/63118/
2922 [63209]: https://github.com/rust-lang/rust/pull/63209/
2923 [63402]: https://github.com/rust-lang/rust/pull/63402/
2924 [63565]: https://github.com/rust-lang/rust/pull/63565/
2925 [63595]: https://github.com/rust-lang/rust/pull/63595/
2926 [63684]: https://github.com/rust-lang/rust/pull/63684/
2927 [63698]: https://github.com/rust-lang/rust/pull/63698/
2928 [63770]: https://github.com/rust-lang/rust/pull/63770/
2929 [63786]: https://github.com/rust-lang/rust/pull/63786/
2930 [63827]: https://github.com/rust-lang/rust/pull/63827/
2931 [63834]: https://github.com/rust-lang/rust/pull/63834/
2932 [63927]: https://github.com/rust-lang/rust/pull/63927/
2933 [63933]: https://github.com/rust-lang/rust/pull/63933/
2934 [63934]: https://github.com/rust-lang/rust/pull/63934/
2935 [63938]: https://github.com/rust-lang/rust/pull/63938/
2936 [63940]: https://github.com/rust-lang/rust/pull/63940/
2937 [63941]: https://github.com/rust-lang/rust/pull/63941/
2938 [63945]: https://github.com/rust-lang/rust/pull/63945/
2939 [64010]: https://github.com/rust-lang/rust/pull/64010/
2940 [64028]: https://github.com/rust-lang/rust/pull/64028/
2941 [64334]: https://github.com/rust-lang/rust/pull/64334/
2942 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2943 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2944 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2945 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2946 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2947 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2949 Version 1.38.0 (2019-09-26)
2950 ==========================
2954 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2955 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2959 - [Added pipelined compilation support to `rustc`.][62766] This will
2960 improve compilation times in some cases. For further information please refer
2961 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2962 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2963 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2964 `x86_64-uwp-windows-msvc` targets.][60260]
2965 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2966 `armv7-unknown-linux-musleabi` targets.][63107]
2967 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2968 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2969 - [Upgraded to LLVM 9.][62592]
2971 \* Refer to Rust's [platform support page][platform-support-doc] for more
2972 information on Rust's tiered platform support.
2976 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2977 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2978 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2979 is available at `std::clone::Clone`). This also makes all built-in macros
2980 available in `std`/`core` root. e.g. `std::include_bytes!`.
2981 - [`str::Chars` now implements `Debug`.][63000]
2982 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2983 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2984 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2985 - [Added euclidean remainder and division operations (`div_euclid`,
2986 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2987 `overflowing`, and `wrapping` versions are available for all
2989 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2990 `PartialEq`.][61491]
2991 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2995 - [`<*const T>::cast`]
2996 - [`<*mut T>::cast`]
2997 - [`Duration::as_secs_f32`]
2998 - [`Duration::as_secs_f64`]
2999 - [`Duration::div_f32`]
3000 - [`Duration::div_f64`]
3001 - [`Duration::from_secs_f32`]
3002 - [`Duration::from_secs_f64`]
3003 - [`Duration::mul_f32`]
3004 - [`Duration::mul_f64`]
3005 - [`any::type_name`]
3009 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3010 - [You can now pass the `--features` option multiple times to enable
3011 multiple features.][cargo/7084]
3016 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3020 - [`rustc` will now warn about some incorrect uses of
3021 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3025 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3027 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3028 issues][62896] with certain crates such as libc.
3030 [60260]: https://github.com/rust-lang/rust/pull/60260/
3031 [61457]: https://github.com/rust-lang/rust/pull/61457/
3032 [61491]: https://github.com/rust-lang/rust/pull/61491/
3033 [61884]: https://github.com/rust-lang/rust/pull/61884/
3034 [61953]: https://github.com/rust-lang/rust/pull/61953/
3035 [62042]: https://github.com/rust-lang/rust/pull/62042/
3036 [62528]: https://github.com/rust-lang/rust/pull/62528/
3037 [62583]: https://github.com/rust-lang/rust/pull/62583/
3038 [62735]: https://github.com/rust-lang/rust/pull/62735/
3039 [62766]: https://github.com/rust-lang/rust/pull/62766/
3040 [62784]: https://github.com/rust-lang/rust/pull/62784/
3041 [62592]: https://github.com/rust-lang/rust/pull/62592/
3042 [62785]: https://github.com/rust-lang/rust/issues/62785/
3043 [62814]: https://github.com/rust-lang/rust/pull/62814/
3044 [62896]: https://github.com/rust-lang/rust/issues/62896/
3045 [63000]: https://github.com/rust-lang/rust/pull/63000/
3046 [63056]: https://github.com/rust-lang/rust/pull/63056/
3047 [63107]: https://github.com/rust-lang/rust/pull/63107/
3048 [63346]: https://github.com/rust-lang/rust/pull/63346/
3049 [63421]: https://github.com/rust-lang/rust/pull/63421/
3050 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3051 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3052 [63048]: https://github.com/rust-lang/rust/pull/63048
3053 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3054 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3055 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3056 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3057 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3058 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3059 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3060 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3061 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3062 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3063 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3064 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3065 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3067 Version 1.37.0 (2019-08-15)
3068 ==========================
3072 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3073 [`Box`][62228], or an [array][62235] and unused.
3074 - [You can now use the `cfg` and `cfg_attr` attributes on
3075 generic parameters.][61547]
3076 - [You can now use enum variants through type alias.][61682] e.g. You can
3077 write the following:
3079 type MyOption = Option<u8>;
3081 fn increment_or_zero(x: MyOption) -> u8 {
3083 MyOption::Some(y) => y + 1,
3084 MyOption::None => 0,
3088 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3089 `const _: u32 = 5;`.
3090 - [You can now use `#[repr(align(X)]` on enums.][61229]
3091 - [The `?` Kleene macro operator is now available in the
3092 2015 edition.][60932]
3096 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3097 and `-C profile-use` flags.][61268] For more information on how to use profile
3098 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3099 - [The `rust-lldb` wrapper script should now work again.][61827]
3103 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3107 - [`BufReader::buffer`]
3108 - [`BufWriter::buffer`]
3109 - [`Cell::from_mut`]
3110 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3111 - [`DoubleEndedIterator::nth_back`]
3113 - [`Wrapping::reverse_bits`]
3114 - [`i128::reverse_bits`]
3115 - [`i16::reverse_bits`]
3116 - [`i32::reverse_bits`]
3117 - [`i64::reverse_bits`]
3118 - [`i8::reverse_bits`]
3119 - [`isize::reverse_bits`]
3120 - [`slice::copy_within`]
3121 - [`u128::reverse_bits`]
3122 - [`u16::reverse_bits`]
3123 - [`u32::reverse_bits`]
3124 - [`u64::reverse_bits`]
3125 - [`u8::reverse_bits`]
3126 - [`usize::reverse_bits`]
3130 - [`Cargo.lock` files are now included by default when publishing executable crates
3131 with executables.][cargo/7026]
3132 - [You can now specify `default-run="foo"` in `[package]` to specify the
3133 default executable to use for `cargo run`.][cargo/7056]
3140 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3141 Please transition your code to using the `..=` syntax for inclusive
3143 - [Using a trait object without the `dyn` will now warn by default.][61203]
3144 Please transition your code to use `dyn Trait` for trait objects instead.
3146 [62228]: https://github.com/rust-lang/rust/pull/62228/
3147 [62235]: https://github.com/rust-lang/rust/pull/62235/
3148 [61802]: https://github.com/rust-lang/rust/pull/61802/
3149 [61827]: https://github.com/rust-lang/rust/pull/61827/
3150 [61547]: https://github.com/rust-lang/rust/pull/61547/
3151 [61682]: https://github.com/rust-lang/rust/pull/61682/
3152 [61268]: https://github.com/rust-lang/rust/pull/61268/
3153 [61342]: https://github.com/rust-lang/rust/pull/61342/
3154 [61347]: https://github.com/rust-lang/rust/pull/61347/
3155 [61100]: https://github.com/rust-lang/rust/pull/61100/
3156 [61203]: https://github.com/rust-lang/rust/pull/61203/
3157 [61229]: https://github.com/rust-lang/rust/pull/61229/
3158 [60932]: https://github.com/rust-lang/rust/pull/60932/
3159 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3160 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3161 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3162 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3163 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3164 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3165 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3166 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3167 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
3168 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3169 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3170 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3171 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3172 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3173 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3174 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3175 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3176 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3177 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3178 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3179 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3180 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3181 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3182 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3185 Version 1.36.0 (2019-07-04)
3186 ==========================
3190 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3191 - [The order of traits in trait objects no longer affects the semantics of that
3192 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3193 `dyn fmt::Debug + Send`, where this was previously not the case.
3197 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3198 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3199 - [`mem::needs_drop` is now available as a const fn.][60364]
3200 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3201 - [`String` now implements `BorrowMut<str>`.][60404]
3202 - [`io::Cursor` now implements `Default`.][60234]
3203 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3204 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3205 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3206 environment has access to heap memory allocation.
3207 - [`String` now implements `From<&String>`.][59825]
3208 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3209 return a tuple of each argument when there is multiple arguments.
3210 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3215 - [`VecDeque::rotate_left`]
3216 - [`VecDeque::rotate_right`]
3217 - [`Iterator::copied`]
3219 - [`io::IoSliceMut`]
3220 - [`Read::read_vectored`]
3221 - [`Write::write_vectored`]
3222 - [`str::as_mut_ptr`]
3223 - [`mem::MaybeUninit`]
3224 - [`pointer::align_offset`]
3225 - [`future::Future`]
3227 - [`task::RawWaker`]
3228 - [`task::RawWakerVTable`]
3234 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3235 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3237 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3241 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3248 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3249 longer recommended, and will be deprecated in 1.39.0.
3251 [60318]: https://github.com/rust-lang/rust/pull/60318/
3252 [60364]: https://github.com/rust-lang/rust/pull/60364/
3253 [60370]: https://github.com/rust-lang/rust/pull/60370/
3254 [60404]: https://github.com/rust-lang/rust/pull/60404/
3255 [60234]: https://github.com/rust-lang/rust/pull/60234/
3256 [60244]: https://github.com/rust-lang/rust/pull/60244/
3257 [58623]: https://github.com/rust-lang/rust/pull/58623/
3258 [59648]: https://github.com/rust-lang/rust/pull/59648/
3259 [59675]: https://github.com/rust-lang/rust/pull/59675/
3260 [59825]: https://github.com/rust-lang/rust/pull/59825/
3261 [59826]: https://github.com/rust-lang/rust/pull/59826/
3262 [59445]: https://github.com/rust-lang/rust/pull/59445/
3263 [59114]: https://github.com/rust-lang/rust/pull/59114/
3264 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3265 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3266 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3267 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3268 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3269 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3270 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3271 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3272 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3273 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3274 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3275 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3276 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3277 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3278 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3279 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3280 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3281 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3282 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3283 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3286 Version 1.35.0 (2019-05-23)
3287 ==========================
3291 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3292 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3293 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3295 unsafe fn call_unsafe(func: unsafe fn()) {
3300 unsafe { call_unsafe(|| {}); }
3307 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3308 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3309 - [Added the `wasm32-unknown-wasi` target.][59464]
3314 - [`Thread` will now show its ID in `Debug` output.][59460]
3315 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3316 - [`alloc::System` now implements `Default`.][59451]
3317 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3319 - [`char::{ToLowercase, ToUppercase}` now
3320 implement `ExactSizeIterator`.][58778]
3321 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3322 - [Removed the `Read` trait bounds
3323 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3324 - [You can now call the `dbg!` macro without any parameters to print the file
3325 and line where it is called.][57847]
3326 - [In place ASCII case conversions are now up to 4× faster.][59283]
3327 e.g. `str::make_ascii_lowercase`
3328 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3335 - [`RefCell::replace_with`]
3336 - [`RefCell::map_split`]
3338 - [`Range::contains`]
3339 - [`RangeFrom::contains`]
3340 - [`RangeTo::contains`]
3341 - [`RangeInclusive::contains`]
3342 - [`RangeToInclusive::contains`]
3343 - [`Option::copied`]
3347 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3348 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3353 - [The Rust toolchain is now available natively for musl based distros.][58575]
3355 [59460]: https://github.com/rust-lang/rust/pull/59460/
3356 [59464]: https://github.com/rust-lang/rust/pull/59464/
3357 [59500]: https://github.com/rust-lang/rust/pull/59500/
3358 [59512]: https://github.com/rust-lang/rust/pull/59512/
3359 [59580]: https://github.com/rust-lang/rust/pull/59580/
3360 [59283]: https://github.com/rust-lang/rust/pull/59283/
3361 [59451]: https://github.com/rust-lang/rust/pull/59451/
3362 [59076]: https://github.com/rust-lang/rust/pull/59076/
3363 [58778]: https://github.com/rust-lang/rust/pull/58778/
3364 [58717]: https://github.com/rust-lang/rust/pull/58717/
3365 [58369]: https://github.com/rust-lang/rust/pull/58369/
3366 [58423]: https://github.com/rust-lang/rust/pull/58423/
3367 [58080]: https://github.com/rust-lang/rust/pull/58080/
3368 [57847]: https://github.com/rust-lang/rust/pull/57847/
3369 [58575]: https://github.com/rust-lang/rust/pull/58575
3370 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3371 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3372 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3373 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3374 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3375 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3376 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3377 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3378 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3379 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3380 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3381 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3383 Version 1.34.2 (2019-05-14)
3384 ===========================
3386 * [Destabilize the `Error::type_id` function due to a security
3387 vulnerability][60785] ([CVE-2019-12083])
3389 [60785]: https://github.com/rust-lang/rust/pull/60785
3390 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3392 Version 1.34.1 (2019-04-25)
3393 ===========================
3395 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3396 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3397 * [Fix Clippy panic when checking some macros][clippy/3805]
3399 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3400 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3401 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3403 Version 1.34.0 (2019-04-11)
3404 ==========================
3408 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3409 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3411 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3412 `#[attr{}]` procedural macros.][57367]
3413 - [You can now write `extern crate self as foo;`][57407] to import your
3414 crate's root into the extern prelude.
3419 - [You can now target `riscv64imac-unknown-none-elf` and
3420 `riscv64gc-unknown-none-elf`.][58406]
3421 - [You can now enable linker plugin LTO optimisations with
3422 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3423 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3425 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3430 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3431 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3432 the `Hash` trait to create an iterator.
3433 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3434 methods.][58421] Most notably you no longer require the `Ord` trait to create
3436 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3437 for all numeric types.][58044]
3438 - [Indexing a `str` is now generic over all types that
3439 implement `SliceIndex<str>`.][57604]
3440 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3441 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3442 produce a warning if their returning type is unused.
3443 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3444 `overflowing_pow` are now available for all numeric types.][57873] These are
3445 equivalent to methods such as `wrapping_add` for the `pow` operation.
3453 * [`Error::type_id`]
3454 * [`atomic::AtomicI16`]
3455 * [`atomic::AtomicI32`]
3456 * [`atomic::AtomicI64`]
3457 * [`atomic::AtomicI8`]
3458 * [`atomic::AtomicU16`]
3459 * [`atomic::AtomicU32`]
3460 * [`atomic::AtomicU64`]
3461 * [`atomic::AtomicU8`]
3462 * [`convert::Infallible`]
3463 * [`convert::TryFrom`]
3464 * [`convert::TryInto`]
3466 * [`iter::successors`]
3467 * [`num::NonZeroI128`]
3468 * [`num::NonZeroI16`]
3469 * [`num::NonZeroI32`]
3470 * [`num::NonZeroI64`]
3471 * [`num::NonZeroI8`]
3472 * [`num::NonZeroIsize`]
3473 * [`slice::sort_by_cached_key`]
3474 * [`str::escape_debug`]
3475 * [`str::escape_default`]
3476 * [`str::escape_unicode`]
3477 * [`str::split_ascii_whitespace`]
3480 * [`Instant::checked_add`]
3481 * [`Instant::checked_sub`]
3482 * [`SystemTime::checked_add`]
3483 * [`SystemTime::checked_sub`]
3487 - [You can now use alternative registries to crates.io.][cargo/6654]
3491 - [You can now use the `?` operator in your documentation tests without manually
3492 adding `fn main() -> Result<(), _> {}`.][56470]
3496 - [`Command::before_exec` is being replaced by the unsafe method
3497 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3498 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3499 can now use `const` functions in `static` variables.
3501 [58370]: https://github.com/rust-lang/rust/pull/58370/
3502 [58406]: https://github.com/rust-lang/rust/pull/58406/
3503 [58421]: https://github.com/rust-lang/rust/pull/58421/
3504 [58166]: https://github.com/rust-lang/rust/pull/58166/
3505 [58044]: https://github.com/rust-lang/rust/pull/58044/
3506 [58057]: https://github.com/rust-lang/rust/pull/58057/
3507 [58059]: https://github.com/rust-lang/rust/pull/58059/
3508 [57809]: https://github.com/rust-lang/rust/pull/57809/
3509 [57873]: https://github.com/rust-lang/rust/pull/57873/
3510 [57604]: https://github.com/rust-lang/rust/pull/57604/
3511 [57367]: https://github.com/rust-lang/rust/pull/57367/
3512 [57407]: https://github.com/rust-lang/rust/pull/57407/
3513 [57425]: https://github.com/rust-lang/rust/pull/57425/
3514 [57106]: https://github.com/rust-lang/rust/pull/57106/
3515 [56470]: https://github.com/rust-lang/rust/pull/56470/
3516 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3517 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3518 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3519 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3520 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3521 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3522 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3523 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3524 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3525 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3526 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3527 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3528 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3529 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3530 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3531 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3532 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3533 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3534 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3535 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3536 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3537 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3538 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3539 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3540 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3541 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3542 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3543 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3544 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3545 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3546 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3549 Version 1.33.0 (2019-02-28)
3550 ==========================
3554 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3555 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3556 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3557 E.g. You can have match statement on a `u8` that covers `0..=255` and
3558 you would no longer be required to have a `_ => unreachable!()` case.
3559 - [You can now have multiple patterns in `if let` and `while let`
3560 expressions.][57532] You can do this with the same syntax as a `match`
3570 let state = Creature::Crab("Ferris");
3572 if let Creature::Crab(name) | Creature::Person(name) = state {
3573 println!("This creature's name is: {}", name);
3577 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3578 this feature will by default produce a warning as this behaviour can be
3579 unintuitive. E.g. `if let _ = 5 {}`
3580 - [You can now use `let` bindings, assignments, expression statements,
3581 and irrefutable pattern destructuring in const functions.][57175]
3582 - [You can now call unsafe const functions.][57067] E.g.
3584 const unsafe fn foo() -> i32 { 5 }
3585 const fn bar() -> i32 {
3589 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3590 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3591 - [You can now specify a specific alignment with the `#[repr(packed)]`
3592 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3593 with an alignment of 2 bytes and a size of 6 bytes.
3594 - [You can now import an item from a module as an `_`.][56303] This allows you to
3595 import a trait's impls, and not have the name in the namespace. E.g.
3597 use std::io::Read as _;
3599 // Allowed as there is only one `Read` in the module.
3602 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3606 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3607 command line argument.][56351]
3608 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3609 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3610 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3611 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3612 information on Rust's platform support.
3613 - [Added support for the `thumbv7neon-linux-androideabi` and
3614 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3615 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3619 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3620 functions for all numeric types.][57566]
3621 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3622 are now `const` functions for all numeric types.][57105]
3623 - [The methods `is_positive` and `is_negative` are now `const` functions for
3624 all signed numeric types.][57105]
3625 - [The `get` method for all `NonZero` types is now `const`.][57167]
3626 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3627 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3628 numeric types.][57234]
3629 - [`Ipv4Addr::new` is now a `const` function][57234]
3633 - [`unix::FileExt::read_exact_at`]
3634 - [`unix::FileExt::write_all_at`]
3635 - [`Option::transpose`]
3636 - [`Result::transpose`]
3637 - [`convert::identity`]
3640 - [`marker::PhantomPinned`]
3641 - [`Vec::resize_with`]
3642 - [`VecDeque::resize_with`]
3643 - [`Duration::as_millis`]
3644 - [`Duration::as_micros`]
3645 - [`Duration::as_nanos`]
3650 - [You can now publish crates that require a feature flag to compile with
3651 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3652 - [Cargo should now rebuild a crate if a file was modified during the initial
3657 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3658 are now deprecated in the standard library, and their usage will now produce a warning.
3659 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3661 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3663 - [Libtest no longer creates a new thread for each test when
3664 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3666 [55982]: https://github.com/rust-lang/rust/pull/55982/
3667 [56243]: https://github.com/rust-lang/rust/pull/56243
3668 [56303]: https://github.com/rust-lang/rust/pull/56303/
3669 [56351]: https://github.com/rust-lang/rust/pull/56351/
3670 [56362]: https://github.com/rust-lang/rust/pull/56362
3671 [56642]: https://github.com/rust-lang/rust/pull/56642/
3672 [56769]: https://github.com/rust-lang/rust/pull/56769/
3673 [56805]: https://github.com/rust-lang/rust/pull/56805
3674 [56947]: https://github.com/rust-lang/rust/pull/56947/
3675 [57049]: https://github.com/rust-lang/rust/pull/57049/
3676 [57067]: https://github.com/rust-lang/rust/pull/57067/
3677 [57105]: https://github.com/rust-lang/rust/pull/57105
3678 [57130]: https://github.com/rust-lang/rust/pull/57130/
3679 [57167]: https://github.com/rust-lang/rust/pull/57167/
3680 [57175]: https://github.com/rust-lang/rust/pull/57175/
3681 [57234]: https://github.com/rust-lang/rust/pull/57234/
3682 [57332]: https://github.com/rust-lang/rust/pull/57332/
3683 [57465]: https://github.com/rust-lang/rust/pull/57465/
3684 [57532]: https://github.com/rust-lang/rust/pull/57532/
3685 [57535]: https://github.com/rust-lang/rust/pull/57535/
3686 [57566]: https://github.com/rust-lang/rust/pull/57566/
3687 [57615]: https://github.com/rust-lang/rust/pull/57615/
3688 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3689 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3690 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3691 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3692 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3693 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3694 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3695 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3696 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3697 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3698 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3699 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3700 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3701 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3702 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3703 [platform-support]: https://forge.rust-lang.org/platform-support.html
3705 Version 1.32.0 (2019-01-17)
3706 ==========================
3711 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3712 operator allows you to specify zero or one repetitions similar to the `*` and
3714 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3715 now always resolve to the item (`enum`, `struct`, etc.) available in the
3716 module if present, before resolving to a external crate or an item the prelude.][56759]
3719 enum Color { Red, Green, Blue }
3725 - [You can now match against `PhantomData<T>` types.][55837]
3726 - [You can now match against literals in macros with the `literal`
3727 specifier.][56072] This will match against a literal of any type.
3728 E.g. `1`, `'A'`, `"Hello World"`
3729 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3731 struct Point(i32, i32);
3734 pub fn new(x: i32, y: i32) -> Self {
3738 pub fn is_origin(&self) -> bool {
3746 - [Self can also now be used in type definitions.][56366] E.g.
3750 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3753 Cons(T, Box<Self>) // likewise here
3756 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3757 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3761 - [The default allocator has changed from jemalloc to the default allocator on
3762 your system.][55238] The compiler itself on Linux & macOS will still use
3763 jemalloc, but programs compiled with it will use the system allocator.
3764 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3768 - [`PathBuf` now implements `FromStr`.][55148]
3769 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3770 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3771 easily debug expressions in your rust program. E.g.
3774 let b = dbg!(a * 2) + 1;
3775 // ^-- prints: [src/main.rs:4] a * 2 = 4
3779 The following APIs are now `const` functions and can be used in a
3783 - [`UnsafeCell::get`]
3784 - [`char::is_ascii`]
3786 - [`ManuallyDrop::new`]
3787 - [`ManuallyDrop::into_inner`]
3788 - [`RangeInclusive::start`]
3789 - [`RangeInclusive::end`]
3790 - [`NonNull::as_ptr`]
3793 - [`Duration::as_secs`]
3794 - [`Duration::subsec_millis`]
3795 - [`Duration::subsec_micros`]
3796 - [`Duration::subsec_nanos`]
3798 - [`Ipv4Addr::is_unspecified`]
3800 - [`Ipv6Addr::octets`]
3804 - [`i8::to_be_bytes`]
3805 - [`i8::to_le_bytes`]
3806 - [`i8::to_ne_bytes`]
3807 - [`i8::from_be_bytes`]
3808 - [`i8::from_le_bytes`]
3809 - [`i8::from_ne_bytes`]
3810 - [`i16::to_be_bytes`]
3811 - [`i16::to_le_bytes`]
3812 - [`i16::to_ne_bytes`]
3813 - [`i16::from_be_bytes`]
3814 - [`i16::from_le_bytes`]
3815 - [`i16::from_ne_bytes`]
3816 - [`i32::to_be_bytes`]
3817 - [`i32::to_le_bytes`]
3818 - [`i32::to_ne_bytes`]
3819 - [`i32::from_be_bytes`]
3820 - [`i32::from_le_bytes`]
3821 - [`i32::from_ne_bytes`]
3822 - [`i64::to_be_bytes`]
3823 - [`i64::to_le_bytes`]
3824 - [`i64::to_ne_bytes`]
3825 - [`i64::from_be_bytes`]
3826 - [`i64::from_le_bytes`]
3827 - [`i64::from_ne_bytes`]
3828 - [`i128::to_be_bytes`]
3829 - [`i128::to_le_bytes`]
3830 - [`i128::to_ne_bytes`]
3831 - [`i128::from_be_bytes`]
3832 - [`i128::from_le_bytes`]
3833 - [`i128::from_ne_bytes`]
3834 - [`isize::to_be_bytes`]
3835 - [`isize::to_le_bytes`]
3836 - [`isize::to_ne_bytes`]
3837 - [`isize::from_be_bytes`]
3838 - [`isize::from_le_bytes`]
3839 - [`isize::from_ne_bytes`]
3840 - [`u8::to_be_bytes`]
3841 - [`u8::to_le_bytes`]
3842 - [`u8::to_ne_bytes`]
3843 - [`u8::from_be_bytes`]
3844 - [`u8::from_le_bytes`]
3845 - [`u8::from_ne_bytes`]
3846 - [`u16::to_be_bytes`]
3847 - [`u16::to_le_bytes`]
3848 - [`u16::to_ne_bytes`]
3849 - [`u16::from_be_bytes`]
3850 - [`u16::from_le_bytes`]
3851 - [`u16::from_ne_bytes`]
3852 - [`u32::to_be_bytes`]
3853 - [`u32::to_le_bytes`]
3854 - [`u32::to_ne_bytes`]
3855 - [`u32::from_be_bytes`]
3856 - [`u32::from_le_bytes`]
3857 - [`u32::from_ne_bytes`]
3858 - [`u64::to_be_bytes`]
3859 - [`u64::to_le_bytes`]
3860 - [`u64::to_ne_bytes`]
3861 - [`u64::from_be_bytes`]
3862 - [`u64::from_le_bytes`]
3863 - [`u64::from_ne_bytes`]
3864 - [`u128::to_be_bytes`]
3865 - [`u128::to_le_bytes`]
3866 - [`u128::to_ne_bytes`]
3867 - [`u128::from_be_bytes`]
3868 - [`u128::from_le_bytes`]
3869 - [`u128::from_ne_bytes`]
3870 - [`usize::to_be_bytes`]
3871 - [`usize::to_le_bytes`]
3872 - [`usize::to_ne_bytes`]
3873 - [`usize::from_be_bytes`]
3874 - [`usize::from_le_bytes`]
3875 - [`usize::from_ne_bytes`]
3879 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3880 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3884 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3888 - [The argument types for AVX's
3889 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3890 been changed from `*const` to `*mut` as the previous implementation
3894 [55148]: https://github.com/rust-lang/rust/pull/55148/
3895 [55238]: https://github.com/rust-lang/rust/pull/55238/
3896 [55280]: https://github.com/rust-lang/rust/pull/55280/
3897 [55610]: https://github.com/rust-lang/rust/pull/55610/
3898 [55663]: https://github.com/rust-lang/rust/pull/55663/
3899 [55702]: https://github.com/rust-lang/rust/pull/55702/
3900 [55837]: https://github.com/rust-lang/rust/pull/55837/
3901 [55843]: https://github.com/rust-lang/rust/pull/55843/
3902 [56072]: https://github.com/rust-lang/rust/pull/56072/
3903 [56245]: https://github.com/rust-lang/rust/pull/56245/
3904 [56365]: https://github.com/rust-lang/rust/pull/56365/
3905 [56366]: https://github.com/rust-lang/rust/pull/56366/
3906 [56395]: https://github.com/rust-lang/rust/pull/56395/
3907 [56759]: https://github.com/rust-lang/rust/pull/56759/
3908 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3909 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3910 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3911 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3912 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3913 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3914 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3915 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3916 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3917 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3918 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3919 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3920 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3921 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3922 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3923 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3924 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3925 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3926 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3927 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3928 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3929 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3930 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3931 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3932 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3933 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3934 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3935 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3936 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3937 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3938 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3939 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3940 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3941 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3942 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3943 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3944 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3945 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3946 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3947 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3948 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3949 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3950 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3951 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3952 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3953 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3954 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3955 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3956 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3957 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3958 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3959 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3960 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3961 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3962 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3963 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3964 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3965 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3966 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3967 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3968 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3969 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3970 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3971 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3972 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3973 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3974 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3975 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3976 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3977 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3978 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3979 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3980 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3981 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3982 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3983 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3984 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3985 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3986 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3987 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3988 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3989 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3990 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3991 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3992 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3993 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3994 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3995 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3996 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3997 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3998 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3999 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4000 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4003 Version 1.31.1 (2018-12-20)
4004 ===========================
4006 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4007 - [Fix broken go-to-definition in RLS][rls/1171]
4008 - [Fix infinite loop on hover in RLS][rls/1170]
4010 [56562]: https://github.com/rust-lang/rust/pull/56562
4011 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4012 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4014 Version 1.31.0 (2018-12-06)
4015 ==========================
4019 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4020 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4021 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4022 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4024 - [You can now define and use `const` functions.][54835] These are currently
4025 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4026 [language reference][const-reference] for what exactly is available.
4027 - [You can now use tool lints, which allow you to scope lints from external
4028 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4029 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4030 a crate, not just in exported functions.][54451]
4031 - [You can now use parentheses in pattern matches.][54497]
4035 - [Updated musl to 1.1.20][54430]
4039 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4040 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4041 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4042 into `Option<&mut T>` using the `From` trait.][53218]
4043 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4048 - [`slice::align_to`]
4049 - [`slice::align_to_mut`]
4050 - [`slice::chunks_exact`]
4051 - [`slice::chunks_exact_mut`]
4052 - [`slice::rchunks`]
4053 - [`slice::rchunks_mut`]
4054 - [`slice::rchunks_exact`]
4055 - [`slice::rchunks_exact_mut`]
4056 - [`Option::replace`]
4060 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4061 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4062 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4064 [52813]: https://github.com/rust-lang/rust/pull/52813/
4065 [53218]: https://github.com/rust-lang/rust/pull/53218/
4066 [53555]: https://github.com/rust-lang/rust/issues/53555/
4067 [54057]: https://github.com/rust-lang/rust/pull/54057/
4068 [54240]: https://github.com/rust-lang/rust/pull/54240/
4069 [54430]: https://github.com/rust-lang/rust/pull/54430/
4070 [54451]: https://github.com/rust-lang/rust/pull/54451/
4071 [54497]: https://github.com/rust-lang/rust/pull/54497/
4072 [54778]: https://github.com/rust-lang/rust/pull/54778/
4073 [54835]: https://github.com/rust-lang/rust/pull/54835/
4074 [54870]: https://github.com/rust-lang/rust/pull/54870/
4075 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4076 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4077 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4078 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4079 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4080 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4081 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4082 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4083 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4084 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4085 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4086 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4087 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4088 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4090 Version 1.30.1 (2018-11-08)
4091 ===========================
4093 - [Fixed overflow ICE in rustdoc][54199]
4094 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4096 [54199]: https://github.com/rust-lang/rust/pull/54199
4097 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4099 Version 1.30.0 (2018-10-25)
4100 ==========================
4104 - [Procedural macros are now available.][52081] These kinds of macros allow for
4105 more powerful code generation. There is a [new chapter available][proc-macros]
4106 in the Rust Programming Language book that goes further in depth.
4107 - [You can now use keywords as identifiers using the raw identifiers
4108 syntax (`r#`),][53236] e.g. `let r#for = true;`
4109 - [Using anonymous parameters in traits is now deprecated with a warning and
4110 will be a hard error in the 2018 edition.][53272]
4111 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4112 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4113 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4114 Previously, using a external crate in a module without a use statement
4115 required `let json = ::serde_json::from_str(foo);` but can now be written
4116 as `let json = serde_json::from_str(foo);`.
4117 - [You can now apply the `#[used]` attribute to static items to prevent the
4118 compiler from optimising them away, even if they appear to be unused,][51363]
4119 e.g. `#[used] static FOO: u32 = 1;`
4120 - [You can now import and reexport macros from other crates with the `use`
4121 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4122 the root module of the crate. If your macro relies on calling other local
4123 macros, it is recommended to export with the
4124 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4126 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4127 using the `vis` specifier.][53370]
4128 - [Non-macro attributes now allow all forms of literals, not just
4129 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4130 write `#[attr(true)]`.
4131 - [You can now specify a function to handle a panic in the Rust runtime with the
4132 `#[panic_handler]` attribute.][51366]
4136 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4137 - [Added the `aarch64-unknown-netbsd` target][53165]
4138 - [Upgraded to LLVM 8.][53611]
4142 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4146 - [`Ipv4Addr::BROADCAST`]
4147 - [`Ipv4Addr::LOCALHOST`]
4148 - [`Ipv4Addr::UNSPECIFIED`]
4149 - [`Ipv6Addr::LOCALHOST`]
4150 - [`Ipv6Addr::UNSPECIFIED`]
4151 - [`Iterator::find_map`]
4153 The following methods are replacement methods for `trim_left`, `trim_right`,
4154 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4156 - [`str::trim_end_matches`]
4158 - [`str::trim_start_matches`]
4159 - [`str::trim_start`]
4163 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4164 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4165 equivalent to calling `rustdoc --error-format=json`.
4166 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4170 - [`rustdoc` allows you to specify what edition to treat your code as with the
4171 `--edition` option.][54057]
4172 - [`rustdoc` now has the `--color` (specify whether to output color) and
4173 `--error-format` (specify error format, e.g. `json`) options.][53003]
4174 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4175 debug symbols.][53774]
4176 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4177 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4179 [50911]: https://github.com/rust-lang/rust/pull/50911/
4180 [51363]: https://github.com/rust-lang/rust/pull/51363/
4181 [51366]: https://github.com/rust-lang/rust/pull/51366/
4182 [52081]: https://github.com/rust-lang/rust/pull/52081/
4183 [53003]: https://github.com/rust-lang/rust/pull/53003/
4184 [53033]: https://github.com/rust-lang/rust/pull/53033/
4185 [53044]: https://github.com/rust-lang/rust/pull/53044/
4186 [53165]: https://github.com/rust-lang/rust/pull/53165/
4187 [53611]: https://github.com/rust-lang/rust/pull/53611/
4188 [53213]: https://github.com/rust-lang/rust/pull/53213/
4189 [53236]: https://github.com/rust-lang/rust/pull/53236/
4190 [53272]: https://github.com/rust-lang/rust/pull/53272/
4191 [53370]: https://github.com/rust-lang/rust/pull/53370/
4192 [53459]: https://github.com/rust-lang/rust/pull/53459/
4193 [53774]: https://github.com/rust-lang/rust/pull/53774/
4194 [53822]: https://github.com/rust-lang/rust/pull/53822/
4195 [54057]: https://github.com/rust-lang/rust/pull/54057/
4196 [54146]: https://github.com/rust-lang/rust/pull/54146/
4197 [54404]: https://github.com/rust-lang/rust/pull/54404/
4198 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4199 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4200 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4201 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4203 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4204 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4205 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4206 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4207 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4208 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4209 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4210 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4211 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4212 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4215 Version 1.29.2 (2018-10-11)
4216 ===========================
4218 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4219 - The `rls-preview` component on the windows-gnu targets has been restored.
4221 [54639]: https://github.com/rust-lang/rust/pull/54639
4224 Version 1.29.1 (2018-09-25)
4225 ===========================
4230 - The standard library's `str::repeat` function contained an out of bounds write
4231 caused by an integer overflow. This has been fixed by deterministically
4232 panicking when an overflow happens.
4234 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4238 Version 1.29.0 (2018-09-13)
4239 ==========================
4243 - [Bumped minimum LLVM version to 5.0.][51899]
4244 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4245 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4246 - [Upgraded to LLVM 7.][51966]
4250 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4251 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4252 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4253 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4255 - [`Cell<T>` now allows `T` to be unsized.][50494]
4256 - [`SocketAddr` is now stable on Redox.][52656]
4261 - [`Iterator::flatten`]
4266 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4267 `--locked` to disable this behavior.
4268 - [`cargo-install` will now allow you to cross compile an install
4269 using `--target`.][cargo/5614]
4270 - [Added the `cargo-fix` subcommand to automatically move project code from
4271 2015 edition to 2018.][cargo/5723]
4272 - [`cargo doc` can now optionally document private types using the
4273 `--document-private-items` flag.][cargo/5543]
4277 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4278 the specified level to that level.][52354] For example `--cap-lints warn`
4279 will demote `deny` and `forbid` lints to `warn`.
4280 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4281 fails and `101` if there is a panic.][52197]
4282 - [A preview of clippy has been made available through rustup.][51122]
4283 You can install the preview with `rustup component add clippy-preview`.
4287 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4288 Use `str::get_unchecked(begin..end)` instead.
4289 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4290 Consider using the `home_dir` function from
4291 https://crates.io/crates/dirs instead.
4292 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4293 - [`cfg` attributes and `--cfg` command line flags are now more
4294 strictly validated.][53893]
4296 [53893]: https://github.com/rust-lang/rust/pull/53893/
4297 [52861]: https://github.com/rust-lang/rust/pull/52861/
4298 [51966]: https://github.com/rust-lang/rust/pull/51966/
4299 [52656]: https://github.com/rust-lang/rust/pull/52656/
4300 [52239]: https://github.com/rust-lang/rust/pull/52239/
4301 [52330]: https://github.com/rust-lang/rust/pull/52330/
4302 [52354]: https://github.com/rust-lang/rust/pull/52354/
4303 [52402]: https://github.com/rust-lang/rust/pull/52402/
4304 [52103]: https://github.com/rust-lang/rust/pull/52103/
4305 [52197]: https://github.com/rust-lang/rust/pull/52197/
4306 [51807]: https://github.com/rust-lang/rust/pull/51807/
4307 [51899]: https://github.com/rust-lang/rust/pull/51899/
4308 [51912]: https://github.com/rust-lang/rust/pull/51912/
4309 [51511]: https://github.com/rust-lang/rust/pull/51511/
4310 [51619]: https://github.com/rust-lang/rust/pull/51619/
4311 [51656]: https://github.com/rust-lang/rust/pull/51656/
4312 [51178]: https://github.com/rust-lang/rust/pull/51178/
4313 [51122]: https://github.com/rust-lang/rust/pull/51122
4314 [50494]: https://github.com/rust-lang/rust/pull/50494/
4315 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4316 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4317 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4318 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4319 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4320 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4321 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4324 Version 1.28.0 (2018-08-02)
4325 ===========================
4329 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4330 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4331 the inner type across Foreign Function Interface (FFI) boundaries.
4332 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4333 and can now be used as identifiers.][51196]
4334 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4335 stable.][51241] This will allow users to specify a global allocator for
4337 - [Unit test functions marked with the `#[test]` attribute can now return
4338 `Result<(), E: Debug>` in addition to `()`.][51298]
4339 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4340 allows macros to easily target lifetimes.
4344 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4345 prioritise making smaller binary sizes. `z` is the same as `s` with the
4346 exception that it does not vectorise loops, which typically results in an even
4348 - [The short error format is now stable.][49546] Specified with
4349 `--error-format=short` this option will provide a more compressed output of
4350 rust error messages.
4351 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4352 - [Reduced the number of allocations in the macro parser.][50855] This can
4353 improve compile times of macro heavy crates on average by 5%.
4357 - [Implemented `Default` for `&mut str`.][51306]
4358 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4359 - [Implemented `Extend` for `()`.][50234]
4360 - [The `Debug` implementation of `time::Duration` should now be more easily
4361 human readable.][50364] Previously a `Duration` of one second would printed as
4362 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4363 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4364 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4365 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4366 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4367 for `PathBuf`.][50170]
4368 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4369 and `Wrapping<i128>`.][50465]
4370 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4371 possible.][51050] This can provide up to a 40% speed increase.
4372 - [Improved error messages when using `format!`.][50610]
4376 - [`Iterator::step_by`]
4377 - [`Path::ancestors`]
4378 - [`SystemTime::UNIX_EPOCH`]
4379 - [`alloc::GlobalAlloc`]
4381 - [`alloc::LayoutErr`]
4384 - [`alloc::alloc_zeroed`]
4385 - [`alloc::dealloc`]
4386 - [`alloc::realloc`]
4387 - [`alloc::handle_alloc_error`]
4388 - [`btree_map::Entry::or_default`]
4389 - [`fmt::Alignment`]
4390 - [`hash_map::Entry::or_default`]
4391 - [`iter::repeat_with`]
4392 - [`num::NonZeroUsize`]
4393 - [`num::NonZeroU128`]
4394 - [`num::NonZeroU16`]
4395 - [`num::NonZeroU32`]
4396 - [`num::NonZeroU64`]
4397 - [`num::NonZeroU8`]
4398 - [`ops::RangeBounds`]
4399 - [`slice::SliceIndex`]
4400 - [`slice::from_mut`]
4401 - [`slice::from_ref`]
4402 - [`{Any + Send + Sync}::downcast_mut`]
4403 - [`{Any + Send + Sync}::downcast_ref`]
4404 - [`{Any + Send + Sync}::is`]
4408 - [Cargo will now no longer allow you to publish crates with build scripts that
4409 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4410 considered to be immutable.
4414 - [The `suggestion_applicability` field in `rustc`'s json output is now
4415 stable.][50486] This will allow dev tools to check whether a code suggestion
4416 would apply to them.
4420 - [Rust will consider trait objects with duplicated constraints to be the same
4421 type as without the duplicated constraint.][51276] For example the below code will
4422 now fail to compile.
4427 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4430 impl Trait + Send + Send {
4431 fn test(&self) { println!("two"); }
4435 [49546]: https://github.com/rust-lang/rust/pull/49546/
4436 [50143]: https://github.com/rust-lang/rust/pull/50143/
4437 [50170]: https://github.com/rust-lang/rust/pull/50170/
4438 [50234]: https://github.com/rust-lang/rust/pull/50234/
4439 [50265]: https://github.com/rust-lang/rust/pull/50265/
4440 [50364]: https://github.com/rust-lang/rust/pull/50364/
4441 [50385]: https://github.com/rust-lang/rust/pull/50385/
4442 [50465]: https://github.com/rust-lang/rust/pull/50465/
4443 [50486]: https://github.com/rust-lang/rust/pull/50486/
4444 [50554]: https://github.com/rust-lang/rust/pull/50554/
4445 [50610]: https://github.com/rust-lang/rust/pull/50610/
4446 [50855]: https://github.com/rust-lang/rust/pull/50855/
4447 [51050]: https://github.com/rust-lang/rust/pull/51050/
4448 [51196]: https://github.com/rust-lang/rust/pull/51196/
4449 [51200]: https://github.com/rust-lang/rust/pull/51200/
4450 [51241]: https://github.com/rust-lang/rust/pull/51241/
4451 [51276]: https://github.com/rust-lang/rust/pull/51276/
4452 [51298]: https://github.com/rust-lang/rust/pull/51298/
4453 [51306]: https://github.com/rust-lang/rust/pull/51306/
4454 [51562]: https://github.com/rust-lang/rust/pull/51562/
4455 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4456 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4457 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4458 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4459 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4460 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4461 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4462 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4463 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4464 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4465 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4466 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4467 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4468 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4469 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4470 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4471 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4472 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4473 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4474 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4475 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4476 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4477 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4478 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4479 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4480 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4481 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4482 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4483 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4484 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4486 Version 1.27.2 (2018-07-20)
4487 ===========================
4492 - The borrow checker was fixed to avoid potential unsoundness when using
4493 match ergonomics: [#52213][52213].
4495 [52213]: https://github.com/rust-lang/rust/issues/52213
4497 Version 1.27.1 (2018-07-10)
4498 ===========================
4503 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4504 when running, which enabled executing code as some other user on a
4505 given machine. This release fixes that vulnerability; you can read
4506 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4508 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4513 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4514 match ergonomics: [#51415][51415], [#49534][49534].
4516 [51415]: https://github.com/rust-lang/rust/issues/51415
4517 [49534]: https://github.com/rust-lang/rust/issues/49534
4518 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4519 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4521 Version 1.27.0 (2018-06-21)
4522 ==========================
4526 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4527 be used as an identifier.
4528 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4529 bare `Trait` syntax, and should make it clearer when being used in tandem with
4530 `impl Trait` because it is equivalent to the following syntax:
4531 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4532 `Box<Trait> == Box<dyn Trait>`.
4533 - [Attributes on generic parameters such as types and lifetimes are
4534 now stable.][48851] e.g.
4535 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4536 - [The `#[must_use]` attribute can now also be used on functions as well as
4537 types.][48925] It provides a lint that by default warns users when the
4538 value returned by a function has not been used.
4542 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4546 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4547 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4548 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4549 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4550 the `cfg` attribute.
4551 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4552 std are now available in core.][49896]
4553 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4555 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4556 that the operation isn't done in place.
4557 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4558 the `#[must_use]` attribute][49533] to warn about unused potentially
4559 expensive allocations.
4563 - [`DoubleEndedIterator::rfind`]
4564 - [`DoubleEndedIterator::rfold`]
4565 - [`DoubleEndedIterator::try_rfold`]
4566 - [`Duration::from_micros`]
4567 - [`Duration::from_nanos`]
4568 - [`Duration::subsec_micros`]
4569 - [`Duration::subsec_millis`]
4570 - [`HashMap::remove_entry`]
4571 - [`Iterator::try_fold`]
4572 - [`Iterator::try_for_each`]
4574 - [`Option::filter`]
4575 - [`String::replace_range`]
4576 - [`Take::set_limit`]
4577 - [`hint::unreachable_unchecked`]
4578 - [`os::unix::process::parent_id`]
4579 - [`ptr::swap_nonoverlapping`]
4580 - [`slice::rsplit_mut`]
4582 - [`slice::swap_with_slice`]
4586 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4587 `readme`, and `repository` fields.][cargo/5386]
4588 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4589 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4590 a different directory than `target` for placing compilation artifacts.
4591 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4592 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4593 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4594 where cargo would infer a binary, Cargo will produce a warning. You can
4595 disable this feature ahead of time by setting any of the following to false:
4596 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4597 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4598 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4602 - [Added “The Rustc book” into the official documentation.][49707]
4603 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4604 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4608 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4609 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4610 compile, `"".is_empty()` will still compile.
4611 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4612 will only print the inner type.][48553] E.g.
4613 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4614 not `AtomicBool(true)`.
4615 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4616 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4617 alignment should cover all use cases.
4618 - The `.description()` method on the `std::error::Error` trait
4619 [has been soft-deprecated][50163]. It is no longer required to implement it.
4621 [48553]: https://github.com/rust-lang/rust/pull/48553/
4622 [48851]: https://github.com/rust-lang/rust/pull/48851/
4623 [48925]: https://github.com/rust-lang/rust/pull/48925/
4624 [49533]: https://github.com/rust-lang/rust/pull/49533/
4625 [49623]: https://github.com/rust-lang/rust/pull/49623/
4626 [49630]: https://github.com/rust-lang/rust/pull/49630/
4627 [49664]: https://github.com/rust-lang/rust/pull/49664/
4628 [49699]: https://github.com/rust-lang/rust/pull/49699/
4629 [49707]: https://github.com/rust-lang/rust/pull/49707/
4630 [49719]: https://github.com/rust-lang/rust/pull/49719/
4631 [49896]: https://github.com/rust-lang/rust/pull/49896/
4632 [49968]: https://github.com/rust-lang/rust/pull/49968/
4633 [50163]: https://github.com/rust-lang/rust/pull/50163
4634 [50177]: https://github.com/rust-lang/rust/pull/50177/
4635 [50378]: https://github.com/rust-lang/rust/pull/50378/
4636 [50398]: https://github.com/rust-lang/rust/pull/50398/
4637 [50423]: https://github.com/rust-lang/rust/pull/50423/
4638 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4639 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4640 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4641 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4642 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4643 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4644 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4645 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4646 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4647 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4648 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4649 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4650 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4651 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4652 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4653 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4654 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4655 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4656 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4657 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4658 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4659 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4660 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4661 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4662 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4663 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4664 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4665 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4666 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4667 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4670 Version 1.26.2 (2018-06-05)
4671 ==========================
4676 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4678 [51117]: https://github.com/rust-lang/rust/issues/51117
4681 Version 1.26.1 (2018-05-29)
4682 ==========================
4687 - [RLS now works on Windows.][50646]
4688 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4694 - [`fn main() -> impl Trait` no longer works for non-Termination
4696 This reverts an accidental stabilization.
4697 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4698 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4700 [50646]: https://github.com/rust-lang/rust/issues/50646
4701 [50656]: https://github.com/rust-lang/rust/pull/50656
4702 [50812]: https://github.com/rust-lang/rust/pull/50812
4703 [50950]: https://github.com/rust-lang/rust/issues/50950
4704 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4706 Version 1.26.0 (2018-05-10)
4707 ==========================
4711 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4712 implement either or both traits.][49299]
4713 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4714 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4715 lifetime can be elided.][49458]
4716 - [`impl Trait` is now stable allowing you to have abstract types in returns
4717 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4718 `fn open(path: impl AsRef<Path>)`.
4719 - [Pattern matching will now automatically apply dereferences.][49394]
4720 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4721 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4722 - [A lot of operations are now available in a const context.][46882] E.g. You
4723 can now index into constant arrays, reference and dereference into constants,
4724 and use tuple struct constructors.
4725 - [Fixed entry slice patterns are now stable.][48516] E.g.
4727 let points = [1, 2, 3, 4];
4729 [1, 2, 3, 4] => println!("All points were sequential."),
4730 _ => println!("Not all points were sequential."),
4737 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4738 - [Fixed exponential projection complexity on nested types.][48296]
4739 This can provide up to a ~12% reduction in compile times for certain crates.
4740 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4741 to remap path prefixes outputted by the compiler.
4742 - [Added `powerpc-unknown-netbsd` target.][48281]
4746 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4747 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4748 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4749 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4750 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4751 - [`ascii::escape_default` is now available in libcore.][48735]
4752 - [Trailing commas are now supported in std and core macros.][48056]
4753 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4754 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4759 - [`*const T::copy_to_nonoverlapping`]
4760 - [`*const T::copy_to`]
4761 - [`*const T::read_unaligned`]
4762 - [`*const T::read_volatile`]
4763 - [`*const T::read`]
4765 - [`*const T::wrapping_add`]
4766 - [`*const T::wrapping_sub`]
4768 - [`*mut T::copy_to_nonoverlapping`]
4769 - [`*mut T::copy_to`]
4770 - [`*mut T::read_unaligned`]
4771 - [`*mut T::read_volatile`]
4773 - [`*mut T::replace`]
4776 - [`*mut T::wrapping_add`]
4777 - [`*mut T::wrapping_sub`]
4778 - [`*mut T::write_bytes`]
4779 - [`*mut T::write_unaligned`]
4780 - [`*mut T::write_volatile`]
4783 - [`FromUtf8Error::as_bytes`]
4784 - [`LocalKey::try_with`]
4785 - [`Option::cloned`]
4786 - [`btree_map::Entry::and_modify`]
4787 - [`fs::read_to_string`]
4790 - [`hash_map::Entry::and_modify`]
4791 - [`iter::FusedIterator`]
4792 - [`ops::RangeInclusive`]
4793 - [`ops::RangeToInclusive`]
4795 - [`slice::rotate_left`]
4796 - [`slice::rotate_right`]
4797 - [`String::retain`]
4802 - [Cargo will now output path to custom commands when `-v` is
4803 passed with `--list`][cargo/5041]
4804 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4808 - [The second edition of "The Rust Programming Language" book is now recommended
4809 over the first.][48404]
4814 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4815 syntax is now invalid.
4817 use std::ops::Fn as dyn;
4818 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4820 - [The result of dereferences are no longer promoted to `'static`.][47408]
4824 const PAIR: &(i32, i32) = &(0, 1);
4825 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4828 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4829 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4831 - [Removed hoedown from rustdoc.][48274]
4832 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4834 [46882]: https://github.com/rust-lang/rust/pull/46882
4835 [47379]: https://github.com/rust-lang/rust/pull/47379
4836 [47408]: https://github.com/rust-lang/rust/pull/47408
4837 [47813]: https://github.com/rust-lang/rust/pull/47813
4838 [48056]: https://github.com/rust-lang/rust/pull/48056
4839 [48125]: https://github.com/rust-lang/rust/pull/48125
4840 [48166]: https://github.com/rust-lang/rust/pull/48166
4841 [48235]: https://github.com/rust-lang/rust/pull/48235
4842 [48274]: https://github.com/rust-lang/rust/pull/48274
4843 [48281]: https://github.com/rust-lang/rust/pull/48281
4844 [48296]: https://github.com/rust-lang/rust/pull/48296
4845 [48326]: https://github.com/rust-lang/rust/pull/48326
4846 [48359]: https://github.com/rust-lang/rust/pull/48359
4847 [48404]: https://github.com/rust-lang/rust/pull/48404
4848 [48481]: https://github.com/rust-lang/rust/pull/48481
4849 [48516]: https://github.com/rust-lang/rust/pull/48516
4850 [48628]: https://github.com/rust-lang/rust/pull/48628
4851 [48629]: https://github.com/rust-lang/rust/pull/48629
4852 [48657]: https://github.com/rust-lang/rust/pull/48657
4853 [48735]: https://github.com/rust-lang/rust/pull/48735
4854 [48978]: https://github.com/rust-lang/rust/pull/48978
4855 [49101]: https://github.com/rust-lang/rust/pull/49101
4856 [49109]: https://github.com/rust-lang/rust/pull/49109
4857 [49121]: https://github.com/rust-lang/rust/pull/49121
4858 [49162]: https://github.com/rust-lang/rust/pull/49162
4859 [49184]: https://github.com/rust-lang/rust/pull/49184
4860 [49234]: https://github.com/rust-lang/rust/pull/49234
4861 [49255]: https://github.com/rust-lang/rust/pull/49255
4862 [49299]: https://github.com/rust-lang/rust/pull/49299
4863 [49305]: https://github.com/rust-lang/rust/pull/49305
4864 [49394]: https://github.com/rust-lang/rust/pull/49394
4865 [49458]: https://github.com/rust-lang/rust/pull/49458
4866 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4867 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4868 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4869 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4870 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4871 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4872 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4873 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4874 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4875 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4876 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4877 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4878 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4879 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4880 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4881 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4882 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4883 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4884 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4885 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4886 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4887 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4888 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4889 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4890 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4891 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4892 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4893 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4894 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4895 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4896 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4897 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4898 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4899 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4900 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4901 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4902 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4903 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4904 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4905 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4906 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4907 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4910 Version 1.25.0 (2018-03-29)
4911 ==========================
4915 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4916 - [You can now use nested groups of imports.][47948]
4917 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4918 - [You can now have `|` at the start of a match arm.][47947] e.g.
4920 enum Foo { A, B, C }
4926 | Foo::B => println!("AB"),
4927 | Foo::C => println!("C"),
4934 - [Upgraded to LLVM 6.][47828]
4935 - [Added `-C lto=val` option.][47521]
4936 - [Added `i586-unknown-linux-musl` target][47282]
4940 - [Impl Send for `process::Command` on Unix.][47760]
4941 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4942 - [`UnsafeCell::into_inner` is now safe.][47204]
4943 - [Implement libstd for CloudABI.][47268]
4944 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4945 - [Implement `AsRef<Path>` for Component][46985]
4946 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4947 - [Moved `Duration` to libcore.][46666]
4951 - [`Location::column`]
4954 The following functions can now be used in a constant expression.
4955 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4956 - [`Duration::new`][47300]
4957 - [`Duration::from_secs`][47300]
4958 - [`Duration::from_millis`][47300]
4962 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4963 - [`cargo new` now defaults to creating a binary crate, instead of a
4964 library crate.][cargo/5029]
4968 - [Rust by example is now shipped with new releases][46196]
4972 - [Deprecated `net::lookup_host`.][47510]
4973 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4974 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4975 around indexing operations (see [#47349][47349]). This has been fixed (which also
4976 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4977 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4979 [33903]: https://github.com/rust-lang/rust/pull/33903
4980 [47947]: https://github.com/rust-lang/rust/pull/47947
4981 [47948]: https://github.com/rust-lang/rust/pull/47948
4982 [47760]: https://github.com/rust-lang/rust/pull/47760
4983 [47790]: https://github.com/rust-lang/rust/pull/47790
4984 [47828]: https://github.com/rust-lang/rust/pull/47828
4985 [47398]: https://github.com/rust-lang/rust/pull/47398
4986 [47510]: https://github.com/rust-lang/rust/pull/47510
4987 [47521]: https://github.com/rust-lang/rust/pull/47521
4988 [47204]: https://github.com/rust-lang/rust/pull/47204
4989 [47251]: https://github.com/rust-lang/rust/pull/47251
4990 [47268]: https://github.com/rust-lang/rust/pull/47268
4991 [47282]: https://github.com/rust-lang/rust/pull/47282
4992 [47300]: https://github.com/rust-lang/rust/pull/47300
4993 [47349]: https://github.com/rust-lang/rust/pull/47349
4994 [46931]: https://github.com/rust-lang/rust/pull/46931
4995 [46985]: https://github.com/rust-lang/rust/pull/46985
4996 [47006]: https://github.com/rust-lang/rust/pull/47006
4997 [46830]: https://github.com/rust-lang/rust/pull/46830
4998 [46095]: https://github.com/rust-lang/rust/pull/46095
4999 [46666]: https://github.com/rust-lang/rust/pull/46666
5000 [46196]: https://github.com/rust-lang/rust/pull/46196
5001 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5002 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5003 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5004 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5005 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5008 Version 1.24.1 (2018-03-01)
5009 ==========================
5011 - [Do not abort when unwinding through FFI][48251]
5012 - [Emit UTF-16 files for linker arguments on Windows][48318]
5013 - [Make the error index generator work again][48308]
5014 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5016 [48251]: https://github.com/rust-lang/rust/issues/48251
5017 [48308]: https://github.com/rust-lang/rust/issues/48308
5018 [48318]: https://github.com/rust-lang/rust/issues/48318
5019 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5022 Version 1.24.0 (2018-02-15)
5023 ==========================
5027 - [External `sysv64` ffi is now available.][46528]
5028 eg. `extern "sysv64" fn foo () {}`
5032 - [rustc now uses 16 codegen units by default for release builds.][46910]
5033 For the fastest builds, utilize `codegen-units=1`.
5034 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5035 - [Add `aarch64-unknown-openbsd` support][46760]
5039 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5040 improvement in performance in the majority of cases.
5041 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5042 with Windows.][46798]
5043 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5044 - [impl `From<bool>` for `AtomicBool`][46293]
5045 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5046 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5047 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5048 - [float::from_bits now just uses transmute.][46012] This provides
5049 some optimisations from LLVM.
5050 - [Copied `AsciiExt` methods onto `char`][46077]
5051 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5052 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5053 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5054 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5058 - [`RefCell::replace`]
5060 - [`atomic::spin_loop_hint`]
5062 The following functions can now be used in a constant expression.
5063 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5065 - [`AtomicBool::new`][46287]
5066 - [`AtomicUsize::new`][46287]
5067 - [`AtomicIsize::new`][46287]
5068 - [`AtomicPtr::new`][46287]
5069 - [`Cell::new`][46287]
5070 - [`{integer}::min_value`][46287]
5071 - [`{integer}::max_value`][46287]
5072 - [`mem::size_of`][46287]
5073 - [`mem::align_of`][46287]
5074 - [`ptr::null`][46287]
5075 - [`ptr::null_mut`][46287]
5076 - [`RefCell::new`][46287]
5077 - [`UnsafeCell::new`][46287]
5081 - [Added a `workspace.default-members` config that
5082 overrides implied `--all` in virtual workspaces.][cargo/4743]
5083 - [Enable incremental by default on development builds.][cargo/4817] Also added
5084 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5085 per-project or global basis respectively.
5092 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5093 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5094 in accordance with IETF RFC 4291 §2.2.
5095 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5096 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5097 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5098 - [Leading zeros in tuple struct members is now an error][47084]
5099 - [`column!()` macro is one-based instead of zero-based][46977]
5100 - [`fmt::Arguments` can no longer be shared across threads][45198]
5101 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5102 - [Cargo sets a different working directory for the compiler][cargo/4788]
5104 [44884]: https://github.com/rust-lang/rust/pull/44884
5105 [45198]: https://github.com/rust-lang/rust/pull/45198
5106 [45506]: https://github.com/rust-lang/rust/pull/45506
5107 [45904]: https://github.com/rust-lang/rust/pull/45904
5108 [45990]: https://github.com/rust-lang/rust/pull/45990
5109 [46012]: https://github.com/rust-lang/rust/pull/46012
5110 [46077]: https://github.com/rust-lang/rust/pull/46077
5111 [46094]: https://github.com/rust-lang/rust/pull/46094
5112 [46284]: https://github.com/rust-lang/rust/pull/46284
5113 [46287]: https://github.com/rust-lang/rust/pull/46287
5114 [46293]: https://github.com/rust-lang/rust/pull/46293
5115 [46528]: https://github.com/rust-lang/rust/pull/46528
5116 [46671]: https://github.com/rust-lang/rust/pull/46671
5117 [46713]: https://github.com/rust-lang/rust/pull/46713
5118 [46735]: https://github.com/rust-lang/rust/pull/46735
5119 [46749]: https://github.com/rust-lang/rust/pull/46749
5120 [46760]: https://github.com/rust-lang/rust/pull/46760
5121 [46798]: https://github.com/rust-lang/rust/pull/46798
5122 [46828]: https://github.com/rust-lang/rust/pull/46828
5123 [46831]: https://github.com/rust-lang/rust/pull/46831
5124 [46833]: https://github.com/rust-lang/rust/pull/46833
5125 [46910]: https://github.com/rust-lang/rust/pull/46910
5126 [46977]: https://github.com/rust-lang/rust/pull/46977
5127 [47018]: https://github.com/rust-lang/rust/pull/47018
5128 [47080]: https://github.com/rust-lang/rust/pull/47080
5129 [47084]: https://github.com/rust-lang/rust/pull/47084
5130 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5131 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5132 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5133 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5134 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5135 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5138 Version 1.23.0 (2018-01-04)
5139 ==========================
5143 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5144 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5145 Which should fix some confusing errors in some operations.
5149 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5150 undefined behavior.][45920]
5151 - [rustc now suggests renaming import if names clash.][45660]
5152 - [Display errors/warnings correctly when there are zero-width or
5153 wide characters.][45711]
5154 - [rustc now avoids unnecessary copies of arguments that are
5155 simple bindings][45380] This should improve memory usage on average by 5-10%.
5156 - [Updated musl used to build musl rustc to 1.1.17][45393]
5160 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5161 - [Implement Hash for raw pointers to unsized types][45483]
5162 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5163 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5164 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5165 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5166 and `<*mut T>::as_mut`][44932]
5167 - [Optimized `Thread::{park, unpark}` implementation][45524]
5168 - [Improved `SliceExt::binary_search` performance.][45333]
5169 - [impl `FromIterator<()>` for `()`][45379]
5170 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5178 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5179 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5180 - [Added unit test checking to `cargo check`][cargo/4592]
5181 - [Cargo now lets you install a specific version
5182 using `cargo install --version`][cargo/4637]
5186 - [Releases now ship with the Cargo book documentation.][45692]
5187 - [rustdoc now prints rendering warnings on every run.][45324]
5191 - [Changes have been made to type equality to make it more correct,
5192 in rare cases this could break some code.][45853] [Tracking issue for
5193 further information][45852]
5194 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5195 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5196 Android 9, the minimum supported version is Android 14.
5197 - [Bumped the minimum LLVM to 3.9][45326]
5199 [44042]: https://github.com/rust-lang/rust/pull/44042
5200 [44932]: https://github.com/rust-lang/rust/pull/44932
5201 [45267]: https://github.com/rust-lang/rust/pull/45267
5202 [45324]: https://github.com/rust-lang/rust/pull/45324
5203 [45326]: https://github.com/rust-lang/rust/pull/45326
5204 [45333]: https://github.com/rust-lang/rust/pull/45333
5205 [45379]: https://github.com/rust-lang/rust/pull/45379
5206 [45380]: https://github.com/rust-lang/rust/pull/45380
5207 [45393]: https://github.com/rust-lang/rust/pull/45393
5208 [45435]: https://github.com/rust-lang/rust/pull/45435
5209 [45483]: https://github.com/rust-lang/rust/pull/45483
5210 [45524]: https://github.com/rust-lang/rust/pull/45524
5211 [45571]: https://github.com/rust-lang/rust/pull/45571
5212 [45580]: https://github.com/rust-lang/rust/pull/45580
5213 [45610]: https://github.com/rust-lang/rust/pull/45610
5214 [45660]: https://github.com/rust-lang/rust/pull/45660
5215 [45692]: https://github.com/rust-lang/rust/pull/45692
5216 [45711]: https://github.com/rust-lang/rust/pull/45711
5217 [45772]: https://github.com/rust-lang/rust/pull/45772
5218 [45852]: https://github.com/rust-lang/rust/issues/45852
5219 [45853]: https://github.com/rust-lang/rust/pull/45853
5220 [45887]: https://github.com/rust-lang/rust/pull/45887
5221 [45920]: https://github.com/rust-lang/rust/pull/45920
5222 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5223 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5224 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5227 Version 1.22.1 (2017-11-22)
5228 ==========================
5230 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5232 [46183]: https://github.com/rust-lang/rust/pull/46183
5234 Version 1.22.0 (2017-11-22)
5235 ==========================
5239 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5240 - [Now accepts underscores in unicode escapes][43716]
5241 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5242 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5246 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5247 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5248 This should decrease compile times for debug builds.
5249 - [strict memory alignment now enabled on ARMv6][45094]
5250 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5254 - [Allow atomic operations up to 32 bits
5255 on `armv5te_unknown_linux_gnueabi`][44978]
5256 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5257 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5258 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5259 - [Properly detect overflow in `Instant += Duration`.][44220]
5260 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5261 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5262 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5269 - [Cargo will now build multi file examples in subdirectories of the `examples`
5270 folder that have a `main.rs` file.][cargo/4496]
5271 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5272 the old format will continue to work and can be updated with `cargo update`.
5273 - [Now supports vendoring git repositories][cargo/3992]
5277 - [`libbacktrace` is now available on Apple platforms.][44251]
5278 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5279 This now lets you specify that a given code example will fail to compile.
5283 - [The minimum Android version that rustc can build for has been bumped
5284 to `4.0` from `2.3`][45656]
5285 - [Allowing `T op= &T` for numeric types has broken some type
5286 inference cases][45480]
5289 [42526]: https://github.com/rust-lang/rust/pull/42526
5290 [43017]: https://github.com/rust-lang/rust/pull/43017
5291 [43716]: https://github.com/rust-lang/rust/pull/43716
5292 [43949]: https://github.com/rust-lang/rust/pull/43949
5293 [44015]: https://github.com/rust-lang/rust/pull/44015
5294 [44220]: https://github.com/rust-lang/rust/pull/44220
5295 [44251]: https://github.com/rust-lang/rust/pull/44251
5296 [44287]: https://github.com/rust-lang/rust/pull/44287
5297 [44303]: https://github.com/rust-lang/rust/pull/44303
5298 [44456]: https://github.com/rust-lang/rust/pull/44456
5299 [44466]: https://github.com/rust-lang/rust/pull/44466
5300 [44895]: https://github.com/rust-lang/rust/pull/44895
5301 [44966]: https://github.com/rust-lang/rust/pull/44966
5302 [44978]: https://github.com/rust-lang/rust/pull/44978
5303 [45041]: https://github.com/rust-lang/rust/pull/45041
5304 [45064]: https://github.com/rust-lang/rust/pull/45064
5305 [45075]: https://github.com/rust-lang/rust/pull/45075
5306 [45094]: https://github.com/rust-lang/rust/pull/45094
5307 [45095]: https://github.com/rust-lang/rust/pull/45095
5308 [45480]: https://github.com/rust-lang/rust/issues/45480
5309 [45656]: https://github.com/rust-lang/rust/pull/45656
5310 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5311 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5312 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5319 Version 1.21.0 (2017-10-12)
5320 ==========================
5324 - [You can now use static references for literals.][43838]
5328 let x: &'static u32 = &0;
5331 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5334 my_macro!(Vec<i32>::new); // Always worked
5335 my_macro!(Vec::<i32>::new); // Now works
5340 - [Upgraded jemalloc to 4.5.0][43911]
5341 - [Enabled unwinding panics on Redox][43917]
5342 - [Now runs LLVM in parallel during translation phase.][43506]
5343 This should reduce peak memory usage.
5347 - [Generate builtin impls for `Clone` for all arrays and tuples that
5348 are `T: Clone`][43690]
5349 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5350 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5351 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5356 [`std::mem::discriminant`]
5360 - [You can now call `cargo install` with multiple package names][cargo/4216]
5361 - [Cargo commands inside a virtual workspace will now implicitly
5362 pass `--all`][cargo/4335]
5363 - [Added a `[patch]` section to `Cargo.toml` to handle
5364 prepublication dependencies][cargo/4123] [RFC 1969]
5365 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5366 like patterns][cargo/4270]
5367 - [Added the `--all-targets` option][cargo/4400]
5368 - [Using required dependencies as a feature is now deprecated and emits
5369 a warning][cargo/4364]
5374 - [Cargo docs are moving][43916]
5375 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5376 - [The rustdoc book is now available][43863]
5377 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5378 - [Added a preview of RLS has been made available through rustup][44204]
5379 Install with `rustup component add rls-preview`
5380 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5381 Previously only showed `std::os::unix`.
5385 - [Changes in method matching against higher-ranked types][43880] This may cause
5386 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5387 - [rustc's JSON error output's byte position start at top of file.][42973]
5388 Was previously relative to the rustc's internal `CodeMap` struct which
5389 required the unstable library `libsyntax` to correctly use.
5390 - [`unused_results` lint no longer ignores booleans][43728]
5392 [42565]: https://github.com/rust-lang/rust/pull/42565
5393 [42973]: https://github.com/rust-lang/rust/pull/42973
5394 [43348]: https://github.com/rust-lang/rust/pull/43348
5395 [43459]: https://github.com/rust-lang/rust/pull/43459
5396 [43506]: https://github.com/rust-lang/rust/pull/43506
5397 [43540]: https://github.com/rust-lang/rust/pull/43540
5398 [43690]: https://github.com/rust-lang/rust/pull/43690
5399 [43728]: https://github.com/rust-lang/rust/pull/43728
5400 [43838]: https://github.com/rust-lang/rust/pull/43838
5401 [43863]: https://github.com/rust-lang/rust/pull/43863
5402 [43880]: https://github.com/rust-lang/rust/pull/43880
5403 [43911]: https://github.com/rust-lang/rust/pull/43911
5404 [43916]: https://github.com/rust-lang/rust/pull/43916
5405 [43917]: https://github.com/rust-lang/rust/pull/43917
5406 [44204]: https://github.com/rust-lang/rust/pull/44204
5407 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5408 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5409 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5410 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5411 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5412 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5413 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5414 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5415 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5417 Version 1.20.0 (2017-08-31)
5418 ===========================
5422 - [Associated constants are now stabilised.][42809]
5423 - [A lot of macro bugs are now fixed.][42913]
5428 - [Struct fields are now properly coerced to the expected field type.][42807]
5429 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5430 `wasm32-experimental-emscripten` target.
5431 - [Changed some of the error messages to be more helpful.][42033]
5432 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5434 - [rustc now reports the total number of errors on compilation failure][43015]
5435 previously this was only the number of errors in the pass that failed.
5436 - [Expansion in rustc has been sped up 29x.][42533]
5437 - [added `msp430-none-elf` target.][43099]
5438 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5440 - [Fixes backtraces on Redox][43228]
5441 - [rustc now identifies different versions of same crate when absolute paths of
5442 different types match in an error message.][42826]
5448 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5449 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5451 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5452 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5453 - [Impl `Clone` for `DefaultHasher`.][42799]
5454 - [Impl `Sync` for `SyncSender`.][42397]
5455 - [Impl `FromStr` for `char`][42271]
5456 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5458 - [allow messages in the `unimplemented!()` macro.][42155]
5459 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5460 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5461 - [Upgrade to Unicode 10.0.0][42999]
5462 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5463 - [Skip the main thread's manual stack guard on Linux][43072]
5464 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5465 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5467 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5472 - [`CStr::into_c_string`]
5473 - [`CString::as_c_str`]
5474 - [`CString::into_boxed_c_str`]
5475 - [`Chain::get_mut`]
5476 - [`Chain::get_ref`]
5477 - [`Chain::into_inner`]
5478 - [`Option::get_or_insert_with`]
5479 - [`Option::get_or_insert`]
5480 - [`OsStr::into_os_string`]
5481 - [`OsString::into_boxed_os_str`]
5484 - [`Utf8Error::error_len`]
5485 - [`char::EscapeDebug`]
5486 - [`char::escape_debug`]
5487 - [`compile_error!`]
5488 - [`f32::from_bits`]
5490 - [`f64::from_bits`]
5492 - [`mem::ManuallyDrop`]
5493 - [`slice::sort_unstable_by_key`]
5494 - [`slice::sort_unstable_by`]
5495 - [`slice::sort_unstable`]
5496 - [`str::from_boxed_utf8_unchecked`]
5497 - [`str::as_bytes_mut`]
5498 - [`str::as_bytes_mut`]
5499 - [`str::from_utf8_mut`]
5500 - [`str::from_utf8_unchecked_mut`]
5502 - [`str::get_unchecked_mut`]
5503 - [`str::get_unchecked`]
5505 - [`str::into_boxed_bytes`]
5510 - [Cargo API token location moved from `~/.cargo/config` to
5511 `~/.cargo/credentials`.][cargo/3978]
5512 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5513 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5514 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5515 - [You can now specify version of a binary when installed through
5516 `cargo install` using `--vers`.][cargo/4229]
5517 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5518 failure.][cargo/4248]
5519 - [Changed the convention around which file is the crate root.][cargo/4259]
5520 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5521 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5526 - [Functions with `'static` in their return types will now not be as usable as
5527 if they were using lifetime parameters instead.][42417]
5528 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5529 takes the sign of NaN into account where previously didn't.][42430]
5531 [42033]: https://github.com/rust-lang/rust/pull/42033
5532 [42155]: https://github.com/rust-lang/rust/pull/42155
5533 [42271]: https://github.com/rust-lang/rust/pull/42271
5534 [42397]: https://github.com/rust-lang/rust/pull/42397
5535 [42417]: https://github.com/rust-lang/rust/pull/42417
5536 [42430]: https://github.com/rust-lang/rust/pull/42430
5537 [42431]: https://github.com/rust-lang/rust/pull/42431
5538 [42533]: https://github.com/rust-lang/rust/pull/42533
5539 [42571]: https://github.com/rust-lang/rust/pull/42571
5540 [42613]: https://github.com/rust-lang/rust/pull/42613
5541 [42799]: https://github.com/rust-lang/rust/pull/42799
5542 [42807]: https://github.com/rust-lang/rust/pull/42807
5543 [42809]: https://github.com/rust-lang/rust/pull/42809
5544 [42822]: https://github.com/rust-lang/rust/pull/42822
5545 [42826]: https://github.com/rust-lang/rust/pull/42826
5546 [42854]: https://github.com/rust-lang/rust/pull/42854
5547 [42913]: https://github.com/rust-lang/rust/pull/42913
5548 [42999]: https://github.com/rust-lang/rust/pull/42999
5549 [43011]: https://github.com/rust-lang/rust/pull/43011
5550 [43015]: https://github.com/rust-lang/rust/pull/43015
5551 [43072]: https://github.com/rust-lang/rust/pull/43072
5552 [43077]: https://github.com/rust-lang/rust/pull/43077
5553 [43097]: https://github.com/rust-lang/rust/pull/43097
5554 [43099]: https://github.com/rust-lang/rust/pull/43099
5555 [43170]: https://github.com/rust-lang/rust/pull/43170
5556 [43178]: https://github.com/rust-lang/rust/pull/43178
5557 [43185]: https://github.com/rust-lang/rust/pull/43185
5558 [43228]: https://github.com/rust-lang/rust/pull/43228
5559 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5560 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5561 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5562 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5563 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5564 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5565 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5566 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5567 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5568 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5569 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5570 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5571 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5572 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5573 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5574 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5575 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5576 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5577 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5578 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5579 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5580 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5581 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5582 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5583 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5584 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5585 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5586 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5587 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5588 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5589 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5590 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5591 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5592 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5593 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5594 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5595 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5596 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5597 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5600 Version 1.19.0 (2017-07-20)
5601 ===========================
5606 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5607 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5608 - [Macro recursion limit increased to 1024 from 64.][41676]
5609 - [Added lint for detecting unused macros.][41907]
5610 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5611 For example: `let x = loop { break 7; };`
5612 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5613 contain `Copy` types and cannot have a `Drop` implementation.
5614 Example: `union Foo { bar: u8, baz: usize }`
5615 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5616 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5621 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5622 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5623 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5624 you should use `--target armv7-linux-androideabi`.
5625 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5626 - [Minor optimisation of string operations.][42037]
5627 - [Compiler error message is now `aborting due to previous error(s)` instead of
5628 `aborting due to N previous errors`][42150] This was previously inaccurate and
5629 would only count certain kinds of errors.
5630 - [The compiler now supports Visual Studio 2017][42225]
5631 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5632 - [Added a lot][42264] of [new error codes][42302]
5633 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5634 libraries with C Run-time Libraries(CRT) to be statically linked.
5635 - [Fixed various ARM codegen bugs][42740]
5640 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5641 `Extend<Cow<'a, str>>`][41449]
5642 - [`Vec` now implements `From<&mut [T]>`][41530]
5643 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5644 - [`SplitWhitespace` now implements `Clone`][41659]
5645 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5647 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5648 macros, but for printing to stderr.
5653 - [`OsString::shrink_to_fit`]
5656 - [`thread::ThreadId`]
5661 - [Build scripts can now add environment variables to the environment
5662 the crate is being compiled in.
5663 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5664 - [Subcommands now replace the current process rather than spawning a new
5665 child process][cargo/3970]
5666 - [Workspace members can now accept glob file patterns][cargo/3979]
5667 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5668 the members in a given workspace.][cargo/3988]
5669 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5670 - [Target directory path is now in the cargo metadata][cargo/4022]
5671 - [Cargo no longer checks out a local working directory for the
5672 crates.io index][cargo/4026] This should provide smaller file size for the
5673 registry, and improve cloning times, especially on Windows machines.
5674 - [Added an `--exclude` option for excluding certain packages when using the
5675 `--all` option][cargo/4031]
5676 - [Cargo will now automatically retry when receiving a 5xx error
5677 from crates.io][cargo/4032]
5678 - [The `--features` option now accepts multiple comma or space
5679 delimited values.][cargo/4084]
5680 - [Added support for custom target specific runners][cargo/3954]
5685 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5687 - [Rust will now release XZ compressed packages][rust-installer/57]
5688 - [rustup will now prefer to download rust packages with
5689 XZ compression][rustup/1100] over GZip packages.
5690 - [Added the ability to escape `#` in rust documentation][41785] By adding
5691 additional `#`'s ie. `##` is now `#`
5696 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5697 - [`-Z` flags are now no longer allowed to be used on the stable
5698 compiler.][41751] This has been a warning for a year previous to this.
5699 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5700 longer works][42844]. Users should migrate to the built-in `check`
5701 command, which has been available since 1.16.
5702 - [Ending a float literal with `._` is now a hard error.
5703 Example: `42._` .][41946]
5704 - [Any use of a private `extern crate` outside of its module is now a
5705 hard error.][36886] This was previously a warning.
5706 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5707 relative while the `::` prefix makes a path absolute, but was ignored and the
5708 path was relative regardless.
5709 - [Floating point constants in match patterns is now a hard error][36890]
5710 This was previously a warning.
5711 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5712 match patterns is now a hard error][36891] This was previously a warning.
5713 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5715 - [From the pound escape, lines consisting of multiple `#`s are
5717 - [It is an error to re-export private enum variants][42460]. This is
5718 known to break a number of crates that depend on an older version of
5720 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5721 to use it to find the linker, and the build will fail where it did
5722 not previously][42607]
5724 [36886]: https://github.com/rust-lang/rust/issues/36886
5725 [36888]: https://github.com/rust-lang/rust/issues/36888
5726 [36890]: https://github.com/rust-lang/rust/issues/36890
5727 [36891]: https://github.com/rust-lang/rust/issues/36891
5728 [36892]: https://github.com/rust-lang/rust/issues/36892
5729 [37406]: https://github.com/rust-lang/rust/issues/37406
5730 [39983]: https://github.com/rust-lang/rust/pull/39983
5731 [41145]: https://github.com/rust-lang/rust/pull/41145
5732 [41192]: https://github.com/rust-lang/rust/pull/41192
5733 [41258]: https://github.com/rust-lang/rust/pull/41258
5734 [41370]: https://github.com/rust-lang/rust/pull/41370
5735 [41449]: https://github.com/rust-lang/rust/pull/41449
5736 [41530]: https://github.com/rust-lang/rust/pull/41530
5737 [41624]: https://github.com/rust-lang/rust/pull/41624
5738 [41656]: https://github.com/rust-lang/rust/pull/41656
5739 [41659]: https://github.com/rust-lang/rust/pull/41659
5740 [41676]: https://github.com/rust-lang/rust/pull/41676
5741 [41751]: https://github.com/rust-lang/rust/pull/41751
5742 [41764]: https://github.com/rust-lang/rust/pull/41764
5743 [41785]: https://github.com/rust-lang/rust/pull/41785
5744 [41873]: https://github.com/rust-lang/rust/pull/41873
5745 [41907]: https://github.com/rust-lang/rust/pull/41907
5746 [41946]: https://github.com/rust-lang/rust/pull/41946
5747 [42016]: https://github.com/rust-lang/rust/pull/42016
5748 [42037]: https://github.com/rust-lang/rust/pull/42037
5749 [42068]: https://github.com/rust-lang/rust/pull/42068
5750 [42150]: https://github.com/rust-lang/rust/pull/42150
5751 [42162]: https://github.com/rust-lang/rust/pull/42162
5752 [42225]: https://github.com/rust-lang/rust/pull/42225
5753 [42264]: https://github.com/rust-lang/rust/pull/42264
5754 [42302]: https://github.com/rust-lang/rust/pull/42302
5755 [42460]: https://github.com/rust-lang/rust/issues/42460
5756 [42607]: https://github.com/rust-lang/rust/issues/42607
5757 [42740]: https://github.com/rust-lang/rust/pull/42740
5758 [42844]: https://github.com/rust-lang/rust/issues/42844
5759 [42948]: https://github.com/rust-lang/rust/pull/42948
5760 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5761 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5762 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5763 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5764 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5765 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5766 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5767 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5768 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5769 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5770 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5771 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5772 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5773 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5774 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5775 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5776 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5777 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5778 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5779 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5780 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5781 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5784 Version 1.18.0 (2017-06-08)
5785 ===========================
5790 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5791 make the item visible to just that module tree. Also accepts the keyword
5792 `crate` to make something public to the whole crate but not users of the
5793 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5794 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5795 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5796 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5797 types like `Write + Send`, trailing `+` are now supported in trait objects,
5798 and better error reporting for trait objects starting with `?Sized`.
5799 - [0e+10 is now a valid floating point literal][40589]
5800 - [Now warns if you bind a lifetime parameter to 'static][40734]
5801 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5802 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5803 representation in some cases.][40377]
5808 - [rustc can now emit mir with `--emit mir`][39891]
5809 - [Improved LLVM IR for trivial functions][40367]
5810 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5811 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5812 opportunities found through profiling
5813 - [Improved backtrace formatting when panicking][38165]
5818 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5819 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5820 iteration or reallocation.
5821 - [Simplified HashMap Bucket interface][40561] provides performance
5822 improvements for iterating and cloning.
5823 - [Specialize Vec::from_elem to use calloc][40409]
5824 - [Fixed Race condition in fs::create_dir_all][39799]
5825 - [No longer caching stdio on Windows][40516]
5826 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5827 2.50%~ faster and in one case now 12.50% faster.
5828 - [Optimized `AtomicBool::fetch_nand`][41143]
5833 - [`Child::try_wait`]
5834 - [`HashMap::retain`]
5835 - [`HashSet::retain`]
5837 - [`TcpStream::peek`]
5838 - [`UdpSocket::peek`]
5839 - [`UdpSocket::peek_from`]
5844 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5845 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5846 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5847 - [Added Android build support][cargo/3885]
5848 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5849 of a certain type, for example `cargo build --bins` will build all
5851 - [Added support for haiku][cargo/3952]
5856 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5857 - [Added rust-windbg script for better debugging on Windows][39983]
5858 - [Rust now uses the official cross compiler for NetBSD][40612]
5859 - [rustdoc now accepts `#` at the start of files][40828]
5860 - [Fixed jemalloc support for musl][41168]
5865 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5866 always placed after the sign if it exists and before the digits. With the `#`
5867 flag the zeroes are placed after the prefix and before the digits.
5868 - [Due to the struct field optimisation][40377], using `transmute` on structs
5869 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5870 always been undefined behavior, but is now more likely to break in practice.
5871 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5872 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5873 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5874 - [Overlapping inherent `impl`s are now a hard error][40728]
5875 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5876 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5877 `out.asm` and `out.ll` instead of only one of the filetypes.
5878 - [ calling a function that returns `Self` will no longer work][41805] when
5879 the size of `Self` cannot be statically determined.
5880 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5881 this has caused a few regressions namely:
5883 - Changed the link order of local static/dynamic libraries (respecting the
5884 order on given rather than having the compiler reorder).
5885 - Changed how MinGW is linked, native code linked to dynamic libraries
5886 may require manually linking to the gcc support library (for the native
5889 [38165]: https://github.com/rust-lang/rust/pull/38165
5890 [39799]: https://github.com/rust-lang/rust/pull/39799
5891 [39891]: https://github.com/rust-lang/rust/pull/39891
5892 [39983]: https://github.com/rust-lang/rust/pull/39983
5893 [40043]: https://github.com/rust-lang/rust/pull/40043
5894 [40241]: https://github.com/rust-lang/rust/pull/40241
5895 [40338]: https://github.com/rust-lang/rust/pull/40338
5896 [40367]: https://github.com/rust-lang/rust/pull/40367
5897 [40377]: https://github.com/rust-lang/rust/pull/40377
5898 [40409]: https://github.com/rust-lang/rust/pull/40409
5899 [40516]: https://github.com/rust-lang/rust/pull/40516
5900 [40556]: https://github.com/rust-lang/rust/pull/40556
5901 [40561]: https://github.com/rust-lang/rust/pull/40561
5902 [40589]: https://github.com/rust-lang/rust/pull/40589
5903 [40612]: https://github.com/rust-lang/rust/pull/40612
5904 [40723]: https://github.com/rust-lang/rust/pull/40723
5905 [40728]: https://github.com/rust-lang/rust/pull/40728
5906 [40731]: https://github.com/rust-lang/rust/pull/40731
5907 [40734]: https://github.com/rust-lang/rust/pull/40734
5908 [40805]: https://github.com/rust-lang/rust/pull/40805
5909 [40807]: https://github.com/rust-lang/rust/pull/40807
5910 [40828]: https://github.com/rust-lang/rust/pull/40828
5911 [40870]: https://github.com/rust-lang/rust/pull/40870
5912 [41085]: https://github.com/rust-lang/rust/pull/41085
5913 [41143]: https://github.com/rust-lang/rust/pull/41143
5914 [41168]: https://github.com/rust-lang/rust/pull/41168
5915 [41270]: https://github.com/rust-lang/rust/issues/41270
5916 [41469]: https://github.com/rust-lang/rust/pull/41469
5917 [41805]: https://github.com/rust-lang/rust/issues/41805
5918 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5919 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5920 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5921 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5922 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5923 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5924 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5925 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5926 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5927 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5928 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5929 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5930 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5931 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5934 Version 1.17.0 (2017-04-27)
5935 ===========================
5940 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5941 * [Fields of structs may be initialized without duplicating the field/variable
5942 names][39761]. [RFC 1682]
5943 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5944 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5945 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5946 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5947 `'b`. Soundness fix.
5948 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5949 * [Static variables may contain references to other statics][40027]
5954 * [Exit quickly on only `--emit dep-info`][40336]
5955 * [Make `-C relocation-model` more correctly determine whether the linker
5956 creates a position-independent executable][40245]
5957 * [Add `-C overflow-checks` to directly control whether integer overflow
5959 * [The rustc type checker now checks items on demand instead of in a single
5960 in-order pass][40008]. This is mostly an internal refactoring in support of
5961 future work, including incremental type checking, but also resolves [RFC
5962 1647], allowing `Self` to appear in `impl` `where` clauses.
5963 * [Optimize vtable loads][39995]
5964 * [Turn off vectorization for Emscripten targets][39990]
5965 * [Provide suggestions for unknown macros imported with `use`][39953]
5966 * [Fix ICEs in path resolution][39939]
5967 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5968 * [Add clearer error message using `&str + &str`][39116]
5979 * [`Ordering::then`]
5980 * [`Ordering::then_with`]
5981 * [`BTreeMap::range`]
5982 * [`BTreeMap::range_mut`]
5983 * [`collections::Bound`]
5984 * [`process::abort`]
5985 * [`ptr::read_unaligned`]
5986 * [`ptr::write_unaligned`]
5987 * [`Result::expect_err`]
5990 * [`Cell::into_inner`]
5996 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5997 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5998 * [`String` implements `FromIterator<&char>`][40028]
5999 * `Box` [implements][40009] a number of new conversions:
6000 `From<Box<str>> for String`,
6001 `From<Box<[T]>> for Vec<T>`,
6002 `From<Box<CStr>> for CString`,
6003 `From<Box<OsStr>> for OsString`,
6004 `From<Box<Path>> for PathBuf`,
6005 `Into<Box<str>> for String`,
6006 `Into<Box<[T]>> for Vec<T>`,
6007 `Into<Box<CStr>> for CString`,
6008 `Into<Box<OsStr>> for OsString`,
6009 `Into<Box<Path>> for PathBuf`,
6010 `Default for Box<str>`,
6011 `Default for Box<CStr>`,
6012 `Default for Box<OsStr>`,
6013 `From<&CStr> for Box<CStr>`,
6014 `From<&OsStr> for Box<OsStr>`,
6015 `From<&Path> for Box<Path>`
6016 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6017 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6018 * [Slightly optimize `slice::sort`][39538]
6019 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6020 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6021 `Box<str>` implements `From<&str>`][39438]
6022 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6023 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6024 * [`format!` estimates the needed capacity before writing a string][39356]
6025 * [Support unprivileged symlink creation in Windows][38921]
6026 * [`PathBuf` implements `Default`][38764]
6027 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6028 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6029 and poor hash functions.
6034 * [Add `cargo check --all`][cargo/3731]
6035 * [Add an option to ignore SSL revocation checking][cargo/3699]
6036 * [Add `cargo run --package`][cargo/3691]
6037 * [Add `required_features`][cargo/3667]
6038 * [Assume `build.rs` is a build script][cargo/3664]
6039 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6044 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6046 * [The "Unstable Book" documents nightly-only features][ubook]
6047 * [Improve the style of the sidebar in rustdoc output][40265]
6048 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6049 * [Fix MSP430 breakage due to `i128`][40257]
6050 * [Preliminary Solaris/SPARCv9 support][39903]
6051 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6052 run without installing the MSVC runtime.
6053 * [`rustdoc --test` includes file names in test names][39788]
6054 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6055 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6056 * [Initial support for `aarch64-unknown-freebsd`][39491]
6057 * [Initial support for `i686-unknown-netbsd`][39426]
6058 * [This release no longer includes the old makefile build system][39431]. Rust
6059 is built with a custom build system, written in Rust, and with Cargo.
6060 * [Add Debug implementations for libcollection structs][39002]
6061 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6062 * [`--test-threads=0` produces an error][38945]
6063 * [`rustup` installs documentation by default][40526]
6064 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6065 WinDbg and Visual Studio to improve the debugging experience.
6070 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6071 workaround, either use MSVC 2015 or run vcvars.bat.
6072 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6073 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6074 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6076 * [`format!` and `Display::to_string` panic if an underlying formatting
6077 implementation returns an error][40117]. Previously the error was silently
6078 ignored. It is incorrect for `write_fmt` to return an error when writing
6080 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6081 crates were marked stable and could be accessed from the stable toolchain.
6082 * [Rust git source no longer includes vendored crates][39728]. Those that need
6083 to build with vendored crates should build from release tarballs.
6084 * [Fix inert attributes from `proc_macro_derives`][39572]
6085 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6086 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6088 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6089 existing code generally ignores the type of dead-code unless a type-hint is
6090 provided; this can cause surprising inference interactions particularly around
6091 defaulting. The new code uniformly ignores the result type of dead-code.
6092 * [Tuple-struct constructors with private fields are no longer visible][38932]
6093 * [Lifetime parameters that do not appear in the arguments are now considered
6094 early-bound][38897], resolving a soundness bug (#[32330]). The
6095 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6097 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6098 * [Make transmuting from fn item types to pointer-sized types a hard
6101 [27787]: https://github.com/rust-lang/rust/issues/27787
6102 [32330]: https://github.com/rust-lang/rust/issues/32330
6103 [34198]: https://github.com/rust-lang/rust/pull/34198
6104 [38161]: https://github.com/rust-lang/rust/pull/38161
6105 [38368]: https://github.com/rust-lang/rust/pull/38368
6106 [38584]: https://github.com/rust-lang/rust/issues/38584
6107 [38661]: https://github.com/rust-lang/rust/pull/38661
6108 [38764]: https://github.com/rust-lang/rust/pull/38764
6109 [38864]: https://github.com/rust-lang/rust/issues/38864
6110 [38897]: https://github.com/rust-lang/rust/pull/38897
6111 [38921]: https://github.com/rust-lang/rust/pull/38921
6112 [38932]: https://github.com/rust-lang/rust/pull/38932
6113 [38945]: https://github.com/rust-lang/rust/pull/38945
6114 [38981]: https://github.com/rust-lang/rust/pull/38981
6115 [39002]: https://github.com/rust-lang/rust/pull/39002
6116 [39116]: https://github.com/rust-lang/rust/pull/39116
6117 [39193]: https://github.com/rust-lang/rust/pull/39193
6118 [39265]: https://github.com/rust-lang/rust/pull/39265
6119 [39356]: https://github.com/rust-lang/rust/pull/39356
6120 [39372]: https://github.com/rust-lang/rust/pull/39372
6121 [39426]: https://github.com/rust-lang/rust/pull/39426
6122 [39431]: https://github.com/rust-lang/rust/pull/39431
6123 [39438]: https://github.com/rust-lang/rust/pull/39438
6124 [39440]: https://github.com/rust-lang/rust/pull/39440
6125 [39485]: https://github.com/rust-lang/rust/pull/39485
6126 [39491]: https://github.com/rust-lang/rust/pull/39491
6127 [39518]: https://github.com/rust-lang/rust/pull/39518
6128 [39538]: https://github.com/rust-lang/rust/pull/39538
6129 [39572]: https://github.com/rust-lang/rust/pull/39572
6130 [39633]: https://github.com/rust-lang/rust/pull/39633
6131 [39642]: https://github.com/rust-lang/rust/pull/39642
6132 [39728]: https://github.com/rust-lang/rust/pull/39728
6133 [39761]: https://github.com/rust-lang/rust/pull/39761
6134 [39788]: https://github.com/rust-lang/rust/pull/39788
6135 [39793]: https://github.com/rust-lang/rust/pull/39793
6136 [39837]: https://github.com/rust-lang/rust/pull/39837
6137 [39843]: https://github.com/rust-lang/rust/pull/39843
6138 [39851]: https://github.com/rust-lang/rust/pull/39851
6139 [39903]: https://github.com/rust-lang/rust/pull/39903
6140 [39939]: https://github.com/rust-lang/rust/pull/39939
6141 [39953]: https://github.com/rust-lang/rust/pull/39953
6142 [39960]: https://github.com/rust-lang/rust/pull/39960
6143 [39990]: https://github.com/rust-lang/rust/pull/39990
6144 [39995]: https://github.com/rust-lang/rust/pull/39995
6145 [40008]: https://github.com/rust-lang/rust/pull/40008
6146 [40009]: https://github.com/rust-lang/rust/pull/40009
6147 [40027]: https://github.com/rust-lang/rust/pull/40027
6148 [40028]: https://github.com/rust-lang/rust/pull/40028
6149 [40037]: https://github.com/rust-lang/rust/pull/40037
6150 [40117]: https://github.com/rust-lang/rust/pull/40117
6151 [40166]: https://github.com/rust-lang/rust/pull/40166
6152 [40245]: https://github.com/rust-lang/rust/pull/40245
6153 [40257]: https://github.com/rust-lang/rust/pull/40257
6154 [40261]: https://github.com/rust-lang/rust/pull/40261
6155 [40265]: https://github.com/rust-lang/rust/pull/40265
6156 [40319]: https://github.com/rust-lang/rust/pull/40319
6157 [40336]: https://github.com/rust-lang/rust/pull/40336
6158 [40526]: https://github.com/rust-lang/rust/pull/40526
6159 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6160 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6161 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6162 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6163 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6164 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6165 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6166 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6167 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6168 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6169 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6170 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6171 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6172 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6173 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6174 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6175 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6176 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6177 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6178 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6179 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6180 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6181 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6182 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6183 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6184 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6185 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6186 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6187 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6188 [mdbook]: https://crates.io/crates/mdbook
6189 [ubook]: https://doc.rust-lang.org/unstable-book/
6192 Version 1.16.0 (2017-03-16)
6193 ===========================
6198 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6199 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6200 match patterns][38069]
6201 * [Clean up semantics of `self` in an import list][38313]
6202 * [`Self` may appear in `impl` headers][38920]
6203 * [`Self` may appear in struct expressions][39282]
6208 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6209 a `.rmeta` file containing only crate metadata][38571]. This can be
6210 used by tools like the Rust Language Service to perform
6211 metadata-only builds.
6212 * [Levenshtein based typo suggestions now work in most places, while
6213 previously they worked only for fields and sometimes for local
6214 variables][38927]. Together with the overhaul of "no
6215 resolution"/"unexpected resolution" errors (#[38154]) they result in
6216 large and systematic improvement in resolution diagnostics.
6217 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6219 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6220 * [`rustc` no longer attempts to provide "consider using an explicit
6221 lifetime" suggestions][37057]. They were inaccurate.
6226 * [`VecDeque::truncate`]
6227 * [`VecDeque::resize`]
6228 * [`String::insert_str`]
6229 * [`Duration::checked_add`]
6230 * [`Duration::checked_sub`]
6231 * [`Duration::checked_div`]
6232 * [`Duration::checked_mul`]
6235 * [`SocketAddr::is_ipv4`]
6236 * [`SocketAddr::is_ipv6`]
6237 * [`IpAddr::is_ipv4`]
6238 * [`IpAddr::is_ipv6`]
6240 * [`Vec::dedup_by_key`]
6241 * [`Result::unwrap_or_default`]
6242 * [`<*const T>::wrapping_offset`]
6243 * [`<*mut T>::wrapping_offset`]
6244 * `CommandExt::creation_flags`
6245 * [`File::set_permissions`]
6246 * [`String::split_off`]
6251 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6252 their argument by `Borrow` parameter][37761]
6253 * [All public types in std implement `Debug`][38006]
6254 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6255 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6256 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6258 * [std: Fix partial writes in `LineWriter`][38062]
6259 * [std: Clamp max read/write sizes on Unix][38062]
6260 * [Use more specific panic message for `&str` slicing errors][38066]
6261 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6262 functionality cannot be achieved in std currently.
6263 * [`writeln!`, like `println!`, now accepts a form with no string
6264 or formatting arguments, to just print a newline][38469]
6265 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6266 * [Reduce the size of static data in `std_unicode::tables`][38781]
6267 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6268 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6270 * [`Duration` implements `Sum`][38712]
6271 * [`String` implements `ToSocketAddrs`][39048]
6276 * [The `cargo check` command does a type check of a project without
6277 building it][cargo/3296]
6278 * [crates.io will display CI badges from Travis and AppVeyor, if
6279 specified in Cargo.toml][cargo/3546]
6280 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6281 * [Compilation profiles accept integer values for `debug`, in addition
6282 to `true` and `false`. These are passed to `rustc` as the value to
6283 `-C debuginfo`][cargo/3534]
6284 * [Implement `cargo --version --verbose`][cargo/3604]
6285 * [All builds now output 'dep-info' build dependencies compatible with
6286 make and ninja][cargo/3557]
6287 * [Build all workspace members with `build --all`][cargo/3511]
6288 * [Document all workspace members with `doc --all`][cargo/3515]
6289 * [Path deps outside workspace are not members][cargo/3443]
6294 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6295 the path to the Rust implementation][38589]
6296 * [The `armv7-linux-androideabi` target no longer enables NEON
6297 extensions, per Google's ABI guide][38413]
6298 * [The stock standard library can be compiled for Redox OS][38401]
6299 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6301 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6303 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6308 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6309 match patterns][38069]
6310 * In this release, references to uninhabited types can not be
6311 pattern-matched. This was accidentally allowed in 1.15.
6312 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6313 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6315 * [Clean up semantics of `self` in an import list][38313]
6316 * Reimplemented lifetime elision. This change was almost entirely compatible
6317 with existing code, but it did close a number of small bugs and loopholes,
6318 as well as being more accepting in some other [cases][41105].
6320 [37057]: https://github.com/rust-lang/rust/pull/37057
6321 [37761]: https://github.com/rust-lang/rust/pull/37761
6322 [38006]: https://github.com/rust-lang/rust/pull/38006
6323 [38051]: https://github.com/rust-lang/rust/pull/38051
6324 [38062]: https://github.com/rust-lang/rust/pull/38062
6325 [38062]: https://github.com/rust-lang/rust/pull/38622
6326 [38066]: https://github.com/rust-lang/rust/pull/38066
6327 [38069]: https://github.com/rust-lang/rust/pull/38069
6328 [38131]: https://github.com/rust-lang/rust/pull/38131
6329 [38154]: https://github.com/rust-lang/rust/pull/38154
6330 [38274]: https://github.com/rust-lang/rust/pull/38274
6331 [38304]: https://github.com/rust-lang/rust/pull/38304
6332 [38313]: https://github.com/rust-lang/rust/pull/38313
6333 [38314]: https://github.com/rust-lang/rust/pull/38314
6334 [38327]: https://github.com/rust-lang/rust/pull/38327
6335 [38401]: https://github.com/rust-lang/rust/pull/38401
6336 [38413]: https://github.com/rust-lang/rust/pull/38413
6337 [38469]: https://github.com/rust-lang/rust/pull/38469
6338 [38559]: https://github.com/rust-lang/rust/pull/38559
6339 [38571]: https://github.com/rust-lang/rust/pull/38571
6340 [38580]: https://github.com/rust-lang/rust/pull/38580
6341 [38589]: https://github.com/rust-lang/rust/pull/38589
6342 [38670]: https://github.com/rust-lang/rust/pull/38670
6343 [38712]: https://github.com/rust-lang/rust/pull/38712
6344 [38726]: https://github.com/rust-lang/rust/pull/38726
6345 [38781]: https://github.com/rust-lang/rust/pull/38781
6346 [38798]: https://github.com/rust-lang/rust/pull/38798
6347 [38909]: https://github.com/rust-lang/rust/pull/38909
6348 [38920]: https://github.com/rust-lang/rust/pull/38920
6349 [38927]: https://github.com/rust-lang/rust/pull/38927
6350 [39048]: https://github.com/rust-lang/rust/pull/39048
6351 [39282]: https://github.com/rust-lang/rust/pull/39282
6352 [39379]: https://github.com/rust-lang/rust/pull/39379
6353 [41105]: https://github.com/rust-lang/rust/issues/41105
6354 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6355 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6356 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6357 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6358 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6359 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6360 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6361 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6362 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6363 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6364 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6365 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6366 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6367 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6368 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6369 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6370 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6371 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6372 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6373 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6374 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6375 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6376 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6377 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6378 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6379 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6380 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6381 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6382 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6383 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6386 Version 1.15.1 (2017-02-09)
6387 ===========================
6389 * [Fix IntoIter::as_mut_slice's signature][39466]
6390 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6392 [39466]: https://github.com/rust-lang/rust/pull/39466
6393 [39523]: https://github.com/rust-lang/rust/pull/39523
6396 Version 1.15.0 (2017-02-02)
6397 ===========================
6402 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6403 stable. This allows popular code-generating crates like Serde and Diesel to
6404 work ergonomically. [RFC 1681].
6405 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6406 with curly braces][36868]. Part of [RFC 1506].
6407 * [A number of minor changes to name resolution have been activated][37127].
6408 They add up to more consistent semantics, allowing for future evolution of
6409 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6410 details of what is different. The breaking changes here have been transitioned
6411 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6412 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6414 * [`?Sized` can be used in `where` clauses][37791]
6415 * [There is now a limit on the size of monomorphized types and it can be
6416 modified with the `#![type_size_limit]` crate attribute, similarly to
6417 the `#![recursion_limit]` attribute][37789]
6422 * [On Windows, the compiler will apply dllimport attributes when linking to
6423 extern functions][37973]. Additional attributes and flags can control which
6424 library kind is linked and its name. [RFC 1717].
6425 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6426 * [The `--test` flag works with procedural macro crates][38107]
6427 * [Fix `extern "aapcs" fn` ABI][37814]
6428 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6429 * [The `format!` expander recognizes incorrect `printf` and shell-style
6430 formatting directives and suggests the correct format][37613].
6431 * [Only report one error for all unused imports in an import list][37456]
6433 Compiler Performance
6434 --------------------
6436 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6437 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6438 * [Don't clone in `UnificationTable::probe`][37848]
6439 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6440 * [Use small vectors in type walker][37760]
6441 * [Macro expansion performance was improved][37701]
6442 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6443 * [Replace FNV with a faster hash function][37229]
6448 * [`std::iter::Iterator::min_by`]
6449 * [`std::iter::Iterator::max_by`]
6450 * [`std::os::*::fs::FileExt`]
6451 * [`std::sync::atomic::Atomic*::get_mut`]
6452 * [`std::sync::atomic::Atomic*::into_inner`]
6453 * [`std::vec::IntoIter::as_slice`]
6454 * [`std::vec::IntoIter::as_mut_slice`]
6455 * [`std::sync::mpsc::Receiver::try_iter`]
6456 * [`std::os::unix::process::CommandExt::before_exec`]
6457 * [`std::rc::Rc::strong_count`]
6458 * [`std::rc::Rc::weak_count`]
6459 * [`std::sync::Arc::strong_count`]
6460 * [`std::sync::Arc::weak_count`]
6461 * [`std::char::encode_utf8`]
6462 * [`std::char::encode_utf16`]
6463 * [`std::cell::Ref::clone`]
6464 * [`std::io::Take::into_inner`]
6469 * [The standard sorting algorithm has been rewritten for dramatic performance
6470 improvements][38192]. It is a hybrid merge sort, drawing influences from
6471 Timsort. Previously it was a naive merge sort.
6472 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6473 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6475 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6476 and `char_indices().last()`][37882]
6477 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6478 * [Chinese characters display correctly in `fmt::Debug`][37855]
6479 * [Derive `Default` for `Duration`][37699]
6480 * [Support creation of anonymous pipes on WinXP/2k][37677]
6481 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6482 * [Don't pass overlapped handles to processes][38835]
6487 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6488 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6489 should instead check the variable at runtime with `std::env`. That the value
6490 was set at build time was a bug, and incorrect when cross-compiling. This
6491 change is known to cause breakage.
6492 * [Add `--all` flag to `cargo test`][cargo/3221]
6493 * [Compile statically against the MSVC CRT][cargo/3363]
6494 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6495 * [Link OpenSSL statically on OSX][cargo/3311]
6496 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6497 * [Test for bad path overrides with summaries][cargo/3336]
6498 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6499 * [Fix retrying crate downloads for network errors][cargo/3348]
6500 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6501 * [Emit more info on --message-format=json][cargo/3319]
6502 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6503 * [Don't ignore errors in workspace manifest][cargo/3409]
6504 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6509 * [Test runners (binaries built with `--test`) now support a `--list` argument
6510 that lists the tests it contains][38185]
6511 * [Test runners now support a `--exact` argument that makes the test filter
6512 match exactly, instead of matching only a substring of the test name][38181]
6513 * [rustdoc supports a `--playground-url` flag][37763]
6514 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6519 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6520 continue to be used in this release by passing `--disable-rustbuild` to the
6521 configure script, but they will be deleted soon. Note that the new build
6522 system uses a different on-disk layout that will likely affect any scripts
6524 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6526 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6527 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6533 * [A number of minor changes to name resolution have been activated][37127].
6534 They add up to more consistent semantics, allowing for future evolution of
6535 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6536 details of what is different. The breaking changes here have been transitioned
6537 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6538 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6539 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6540 should instead check the variable at runtime with `std::env`. That the value
6541 was set at build time was a bug, and incorrect when cross-compiling. This
6542 change is known to cause breakage.
6543 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6544 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6545 1.10 and is now an error by default. It will become a hard error in the near
6547 * [The semantics relating modules to file system directories are changing in
6548 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6549 lint, which is a warning in this release, and will become a hard error in the
6551 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6552 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6553 the underlying iterator][37834]
6555 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6556 [33685]: https://github.com/rust-lang/rust/issues/33685
6557 [36868]: https://github.com/rust-lang/rust/pull/36868
6558 [37127]: https://github.com/rust-lang/rust/pull/37127
6559 [37229]: https://github.com/rust-lang/rust/pull/37229
6560 [37456]: https://github.com/rust-lang/rust/pull/37456
6561 [37527]: https://github.com/rust-lang/rust/pull/37527
6562 [37602]: https://github.com/rust-lang/rust/pull/37602
6563 [37613]: https://github.com/rust-lang/rust/pull/37613
6564 [37615]: https://github.com/rust-lang/rust/pull/37615
6565 [37636]: https://github.com/rust-lang/rust/pull/37636
6566 [37627]: https://github.com/rust-lang/rust/pull/37627
6567 [37642]: https://github.com/rust-lang/rust/pull/37642
6568 [37677]: https://github.com/rust-lang/rust/pull/37677
6569 [37699]: https://github.com/rust-lang/rust/pull/37699
6570 [37701]: https://github.com/rust-lang/rust/pull/37701
6571 [37705]: https://github.com/rust-lang/rust/pull/37705
6572 [37749]: https://github.com/rust-lang/rust/pull/37749
6573 [37760]: https://github.com/rust-lang/rust/pull/37760
6574 [37763]: https://github.com/rust-lang/rust/pull/37763
6575 [37764]: https://github.com/rust-lang/rust/pull/37764
6576 [37789]: https://github.com/rust-lang/rust/pull/37789
6577 [37791]: https://github.com/rust-lang/rust/pull/37791
6578 [37814]: https://github.com/rust-lang/rust/pull/37814
6579 [37817]: https://github.com/rust-lang/rust/pull/37817
6580 [37834]: https://github.com/rust-lang/rust/pull/37834
6581 [37848]: https://github.com/rust-lang/rust/pull/37848
6582 [37855]: https://github.com/rust-lang/rust/pull/37855
6583 [37882]: https://github.com/rust-lang/rust/pull/37882
6584 [37888]: https://github.com/rust-lang/rust/pull/37888
6585 [37973]: https://github.com/rust-lang/rust/pull/37973
6586 [37979]: https://github.com/rust-lang/rust/pull/37979
6587 [38086]: https://github.com/rust-lang/rust/pull/38086
6588 [38107]: https://github.com/rust-lang/rust/pull/38107
6589 [38117]: https://github.com/rust-lang/rust/pull/38117
6590 [38134]: https://github.com/rust-lang/rust/pull/38134
6591 [38146]: https://github.com/rust-lang/rust/pull/38146
6592 [38181]: https://github.com/rust-lang/rust/pull/38181
6593 [38182]: https://github.com/rust-lang/rust/pull/38182
6594 [38185]: https://github.com/rust-lang/rust/pull/38185
6595 [38192]: https://github.com/rust-lang/rust/pull/38192
6596 [38279]: https://github.com/rust-lang/rust/pull/38279
6597 [38835]: https://github.com/rust-lang/rust/pull/38835
6598 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6599 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6600 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6601 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6602 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6603 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6604 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6605 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6606 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6607 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6608 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6609 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6610 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6611 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6612 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6613 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6614 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6615 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6616 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6617 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6618 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6619 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6620 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6621 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6622 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6623 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6624 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6625 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6626 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6627 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6628 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6629 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6630 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6631 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6632 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6633 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6634 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6635 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6638 Version 1.14.0 (2016-12-22)
6639 ===========================
6644 * [`..` matches multiple tuple fields in enum variants, structs
6645 and tuples][36843]. [RFC 1492].
6646 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6647 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6648 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6649 dereferencing][36822]
6654 * [Mark enums with non-zero discriminant as non-zero][37224]
6655 * [Lower-case `static mut` names are linted like other
6656 statics and consts][37162]
6657 * [Fix ICE on some macros in const integer positions
6658 (e.g. `[u8; m!()]`)][36819]
6659 * [Improve error message and snippet for "did you mean `x`"][36798]
6660 * [Add a panic-strategy field to the target specification][36794]
6661 * [Include LLVM version in `--version --verbose`][37200]
6663 Compile-time Optimizations
6664 --------------------------
6666 * [Improve macro expansion performance][37569]
6667 * [Shrink `Expr_::ExprInlineAsm`][37445]
6668 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6669 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6670 * [Avoid more allocations when compiling html5ever][37373]
6671 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6672 * [Avoid some allocations in the macro parser][37318]
6673 * [Use a faster deflate setting][37298]
6674 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6675 during interning of slices][37270]
6676 * [Optimize `write_metadata`][37267]
6677 * [Don't process obligation forest cycles when stalled][37231]
6678 * [Avoid many `CrateConfig` clones][37161]
6679 * [Optimize `Substs::super_fold_with`][37108]
6680 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6681 * [Speed up `plug_leaks`][36917]
6686 * [`println!()`, with no arguments, prints newline][36825].
6687 Previously, an empty string was required to achieve the same.
6688 * [`Wrapping` impls standard binary and unary operators, as well as
6689 the `Sum` and `Product` iterators][37356]
6690 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6692 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6693 `VecDeque` iterators][37315]
6694 * [Improve `SipHasher` performance on small values][37312]
6695 * [Add Iterator trait TrustedLen to enable better FromIterator /
6697 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6698 * [`ReadDir` implements `Debug`][37221]
6699 * [Implement `RefUnwindSafe` for atomic types][37178]
6700 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6701 * [Avoid allocations in `Decoder::read_str`][37064]
6702 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6703 * [Impl `Debug` for raw pointers to unsized data][36880]
6704 * [Don't reuse `HashMap` random seeds][37470]
6705 * [The internal memory layout of `HashMap` is more cache-friendly, for
6706 significant improvements in some operations][36692]
6707 * [`HashMap` uses less memory on 32-bit architectures][36595]
6708 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6713 * [Expose rustc cfg values to build scripts][cargo/3243]
6714 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6715 * [Fix passing --features when testing multiple packages][cargo/3280]
6716 * [Use a single profile set per workspace][cargo/3249]
6717 * [Load `replace` sections from lock files][cargo/3220]
6718 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6723 * [rustup is the recommended Rust installation method][1.14rustup]
6724 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6725 S390x. These are [tier 2] platforms and may have major defects. Follow the
6726 instructions on the website to install, or add the targets to an existing
6727 installation with `rustup target add`. The new target triples are:
6728 - `mips-unknown-linux-gnu`
6729 - `mipsel-unknown-linux-gnu`
6730 - `mips64-unknown-linux-gnuabi64`
6731 - `mips64el-unknown-linux-gnuabi64 `
6732 - `powerpc-unknown-linux-gnu`
6733 - `powerpc64-unknown-linux-gnu`
6734 - `powerpc64le-unknown-linux-gnu`
6735 - `s390x-unknown-linux-gnu `
6736 * This release includes target (std) builds for ARM Linux running MUSL
6737 libc. These are [tier 2] platforms and may have major defects. Add the
6738 following triples to an existing rustup installation with `rustup target add`:
6739 - `arm-unknown-linux-musleabi`
6740 - `arm-unknown-linux-musleabihf`
6741 - `armv7-unknown-linux-musleabihf`
6742 * This release includes [experimental support for WebAssembly][1.14wasm], via
6743 the `wasm32-unknown-emscripten` target. This target is known to have major
6744 defects. Please test, report, and fix.
6745 * rustup no longer installs documentation by default. Run `rustup
6746 component add rust-docs` to install.
6747 * [Fix line stepping in debugger][37310]
6748 * [Enable line number debuginfo in releases][37280]
6753 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6754 * [Add support for Fuchsia OS][37313]
6755 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6760 * [A number of forward-compatibility lints used by the compiler
6761 to gradually introduce language changes have been converted
6762 to deny by default][36894]:
6763 - ["use of inaccessible extern crate erroneously allowed"][36886]
6764 - ["type parameter default erroneously allowed in invalid location"][36887]
6765 - ["detects super or self keywords at the beginning of global path"][36888]
6766 - ["two overlapping inherent impls define an item with the same name
6767 were erroneously allowed"][36889]
6768 - ["floating-point constants cannot be used in patterns"][36890]
6769 - ["constants of struct or enum type can only be used in a pattern if
6770 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6771 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6772 * [Prohibit patterns in trait methods without bodies][37378]
6773 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6774 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6775 * [The `$crate` macro variable is accepted in fewer locations][37213]
6776 * [Impls specifying extra region requirements beyond the trait
6777 they implement are rejected][37167]
6778 * [Enums may not be unsized][37111]. Unsized enums are intended to
6779 work but never have. For now they are forbidden.
6780 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6782 [tier 2]: https://forge.rust-lang.org/platform-support.html
6783 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6784 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6785 [36430]: https://github.com/rust-lang/rust/pull/36430
6786 [36595]: https://github.com/rust-lang/rust/pull/36595
6787 [36595]: https://github.com/rust-lang/rust/pull/36595
6788 [36692]: https://github.com/rust-lang/rust/pull/36692
6789 [36767]: https://github.com/rust-lang/rust/pull/36767
6790 [36794]: https://github.com/rust-lang/rust/pull/36794
6791 [36798]: https://github.com/rust-lang/rust/pull/36798
6792 [36819]: https://github.com/rust-lang/rust/pull/36819
6793 [36822]: https://github.com/rust-lang/rust/pull/36822
6794 [36825]: https://github.com/rust-lang/rust/pull/36825
6795 [36843]: https://github.com/rust-lang/rust/pull/36843
6796 [36880]: https://github.com/rust-lang/rust/pull/36880
6797 [36886]: https://github.com/rust-lang/rust/issues/36886
6798 [36887]: https://github.com/rust-lang/rust/issues/36887
6799 [36888]: https://github.com/rust-lang/rust/issues/36888
6800 [36889]: https://github.com/rust-lang/rust/issues/36889
6801 [36890]: https://github.com/rust-lang/rust/issues/36890
6802 [36891]: https://github.com/rust-lang/rust/issues/36891
6803 [36892]: https://github.com/rust-lang/rust/issues/36892
6804 [36894]: https://github.com/rust-lang/rust/pull/36894
6805 [36917]: https://github.com/rust-lang/rust/pull/36917
6806 [36993]: https://github.com/rust-lang/rust/pull/36993
6807 [37037]: https://github.com/rust-lang/rust/pull/37037
6808 [37064]: https://github.com/rust-lang/rust/pull/37064
6809 [37094]: https://github.com/rust-lang/rust/pull/37094
6810 [37108]: https://github.com/rust-lang/rust/pull/37108
6811 [37111]: https://github.com/rust-lang/rust/pull/37111
6812 [37161]: https://github.com/rust-lang/rust/pull/37161
6813 [37162]: https://github.com/rust-lang/rust/pull/37162
6814 [37167]: https://github.com/rust-lang/rust/pull/37167
6815 [37178]: https://github.com/rust-lang/rust/pull/37178
6816 [37200]: https://github.com/rust-lang/rust/pull/37200
6817 [37213]: https://github.com/rust-lang/rust/pull/37213
6818 [37221]: https://github.com/rust-lang/rust/pull/37221
6819 [37224]: https://github.com/rust-lang/rust/pull/37224
6820 [37230]: https://github.com/rust-lang/rust/pull/37230
6821 [37231]: https://github.com/rust-lang/rust/pull/37231
6822 [37247]: https://github.com/rust-lang/rust/pull/37247
6823 [37267]: https://github.com/rust-lang/rust/pull/37267
6824 [37270]: https://github.com/rust-lang/rust/pull/37270
6825 [37273]: https://github.com/rust-lang/rust/pull/37273
6826 [37280]: https://github.com/rust-lang/rust/pull/37280
6827 [37298]: https://github.com/rust-lang/rust/pull/37298
6828 [37306]: https://github.com/rust-lang/rust/pull/37306
6829 [37310]: https://github.com/rust-lang/rust/pull/37310
6830 [37312]: https://github.com/rust-lang/rust/pull/37312
6831 [37313]: https://github.com/rust-lang/rust/pull/37313
6832 [37315]: https://github.com/rust-lang/rust/pull/37315
6833 [37318]: https://github.com/rust-lang/rust/pull/37318
6834 [37322]: https://github.com/rust-lang/rust/pull/37322
6835 [37326]: https://github.com/rust-lang/rust/pull/37326
6836 [37351]: https://github.com/rust-lang/rust/pull/37351
6837 [37356]: https://github.com/rust-lang/rust/pull/37356
6838 [37367]: https://github.com/rust-lang/rust/pull/37367
6839 [37373]: https://github.com/rust-lang/rust/pull/37373
6840 [37378]: https://github.com/rust-lang/rust/pull/37378
6841 [37389]: https://github.com/rust-lang/rust/pull/37389
6842 [37392]: https://github.com/rust-lang/rust/pull/37392
6843 [37427]: https://github.com/rust-lang/rust/pull/37427
6844 [37439]: https://github.com/rust-lang/rust/pull/37439
6845 [37445]: https://github.com/rust-lang/rust/pull/37445
6846 [37470]: https://github.com/rust-lang/rust/pull/37470
6847 [37569]: https://github.com/rust-lang/rust/pull/37569
6848 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6849 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6850 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6851 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6852 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6853 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6854 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6857 Version 1.13.0 (2016-11-10)
6858 ===========================
6863 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6864 errors, like the `try!` macro, described in [RFC 0243].
6865 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6866 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6867 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6868 * [Fix lifetime rules for 'if' conditions][36029]
6869 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6874 * [Add the `-C link-arg` argument][36574]
6875 * [Remove the old AST-based backend from rustc_trans][35764]
6876 * [Don't enable NEON by default on armv7 Linux][35814]
6877 * [Fix debug line number info for macro expansions][35238]
6878 * [Do not emit "class method" debuginfo for types that are not
6879 DICompositeType][36008]
6880 * [Warn about multiple conflicting #[repr] hints][34623]
6881 * [When sizing DST, don't double-count nested struct prefixes][36351]
6882 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6883 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6884 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6885 * [Expand macros without recursing to avoid stack overflows][36214]
6890 * [Replace macro backtraces with labeled local uses][35702]
6891 * [Improve error message for misplaced doc comments][33922]
6892 * [Buffer unix and lock windows to prevent message interleaving][35975]
6893 * [Update lifetime errors to specifically note temporaries][36171]
6894 * [Special case a few colors for Windows][36178]
6895 * [Suggest `use self` when such an import resolves][36289]
6896 * [Be more specific when type parameter shadows primitive type][36338]
6897 * Many minor improvements
6899 Compile-time Optimizations
6900 --------------------------
6902 * [Compute and cache HIR hashes at beginning][35854]
6903 * [Don't hash types in loan paths][36004]
6904 * [Cache projections in trans][35761]
6905 * [Optimize the parser's last token handling][36527]
6906 * [Only instantiate #[inline] functions in codegen units referencing
6907 them][36524]. This leads to big improvements in cases where crates export
6908 define many inline functions without using them directly.
6909 * [Lazily allocate TypedArena's first chunk][36592]
6910 * [Don't allocate during default HashSet creation][36734]
6917 * [`overflowing_abs`]
6918 * [`RefCell::try_borrow`]
6919 * [`RefCell::try_borrow_mut`]
6924 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6925 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6927 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6928 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6929 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6930 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6931 * [Use arc4rand on FreeBSD][35884]
6932 * [memrchr: Correct aligned offset computation][35969]
6933 * [Improve Demangling of Rust Symbols][36059]
6934 * [Use monotonic time in condition variables][35048]
6935 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6936 * [Implement conversion traits for `char`][35755]
6937 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6938 * [Zero first byte of CString on drop][36264]
6939 * [Inherit overflow checks for sum and product][36372]
6940 * [Add missing Eq implementations][36423]
6941 * [Implement `Debug` for `DirEntry`][36631]
6942 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6944 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6945 * [Implement more traits for `std::io::ErrorKind`][35911]
6946 * [Optimize BinaryHeap bounds checking][36072]
6947 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6948 `extend_with_element`][36355]
6949 * [Fix overflow checking in unsigned pow()][34942]
6954 * This release includes security fixes to both curl and OpenSSL.
6955 * [Fix transitive doctests when panic=abort][cargo/3021]
6956 * [Add --all-features flag to cargo][cargo/3038]
6957 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6958 * [Don't parse the home directory more than once][cargo/3078]
6959 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6960 * [Update OpenSSL to 1.0.2j][cargo/3121]
6961 * [Add license and license_file to cargo metadata output][cargo/3110]
6962 * [Make crates-io registry URL optional in config; ignore all changes to
6963 source.crates-io][cargo/3089]
6964 * [Don't download dependencies from other platforms][cargo/3123]
6965 * [Build transitive dev-dependencies when needed][cargo/3125]
6966 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6967 * [Avoid updating registry when adding existing deps][cargo/3144]
6968 * [Warn about path overrides that won't work][cargo/3136]
6969 * [Use workspaces during `cargo install`][cargo/3146]
6970 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6971 * [Add --message-format flag][cargo/3000]
6972 * [Pass target environment for rustdoc][cargo/3205]
6973 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6974 * [Update curl and curl-sys][cargo/3241]
6975 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6980 * [rustdoc: Add the `--sysroot` argument][36586]
6981 * [rustdoc: Fix a couple of issues with the search results][35655]
6982 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6983 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6984 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6989 * [Remove unmaintained style guide][35124]
6990 * [Add s390x support][36369]
6991 * [Initial work at Haiku OS support][36727]
6992 * [Add mips-uclibc targets][35734]
6993 * [Crate-ify compiler-rt into compiler-builtins][35021]
6994 * [Add rustc version info (git hash + date) to dist tarball][36213]
6995 * Many documentation improvements
7000 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7001 * [Deny (by default) transmuting from fn item types to pointer-sized
7002 types][34923]. Continuing the long transition to zero-sized fn items,
7004 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7006 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7007 * [Fix lifetime rules for 'if' conditions][36029].
7008 * [Inherit overflow checks for sum and product][36372].
7009 * [Forbid user-defined macros named "macro_rules"][36730].
7011 [33922]: https://github.com/rust-lang/rust/pull/33922
7012 [34623]: https://github.com/rust-lang/rust/pull/34623
7013 [34923]: https://github.com/rust-lang/rust/pull/34923
7014 [34942]: https://github.com/rust-lang/rust/pull/34942
7015 [34982]: https://github.com/rust-lang/rust/pull/34982
7016 [35021]: https://github.com/rust-lang/rust/pull/35021
7017 [35048]: https://github.com/rust-lang/rust/pull/35048
7018 [35074]: https://github.com/rust-lang/rust/pull/35074
7019 [35124]: https://github.com/rust-lang/rust/pull/35124
7020 [35234]: https://github.com/rust-lang/rust/pull/35234
7021 [35238]: https://github.com/rust-lang/rust/pull/35238
7022 [35354]: https://github.com/rust-lang/rust/pull/35354
7023 [35559]: https://github.com/rust-lang/rust/pull/35559
7024 [35585]: https://github.com/rust-lang/rust/pull/35585
7025 [35627]: https://github.com/rust-lang/rust/pull/35627
7026 [35655]: https://github.com/rust-lang/rust/pull/35655
7027 [35702]: https://github.com/rust-lang/rust/pull/35702
7028 [35707]: https://github.com/rust-lang/rust/pull/35707
7029 [35728]: https://github.com/rust-lang/rust/pull/35728
7030 [35734]: https://github.com/rust-lang/rust/pull/35734
7031 [35755]: https://github.com/rust-lang/rust/pull/35755
7032 [35761]: https://github.com/rust-lang/rust/pull/35761
7033 [35764]: https://github.com/rust-lang/rust/pull/35764
7034 [35814]: https://github.com/rust-lang/rust/pull/35814
7035 [35854]: https://github.com/rust-lang/rust/pull/35854
7036 [35871]: https://github.com/rust-lang/rust/pull/35871
7037 [35884]: https://github.com/rust-lang/rust/pull/35884
7038 [35911]: https://github.com/rust-lang/rust/pull/35911
7039 [35969]: https://github.com/rust-lang/rust/pull/35969
7040 [35975]: https://github.com/rust-lang/rust/pull/35975
7041 [36004]: https://github.com/rust-lang/rust/pull/36004
7042 [36008]: https://github.com/rust-lang/rust/pull/36008
7043 [36014]: https://github.com/rust-lang/rust/pull/36014
7044 [36029]: https://github.com/rust-lang/rust/pull/36029
7045 [36059]: https://github.com/rust-lang/rust/pull/36059
7046 [36072]: https://github.com/rust-lang/rust/pull/36072
7047 [36101]: https://github.com/rust-lang/rust/pull/36101
7048 [36104]: https://github.com/rust-lang/rust/pull/36104
7049 [36171]: https://github.com/rust-lang/rust/pull/36171
7050 [36173]: https://github.com/rust-lang/rust/pull/36173
7051 [36178]: https://github.com/rust-lang/rust/pull/36178
7052 [36213]: https://github.com/rust-lang/rust/pull/36213
7053 [36214]: https://github.com/rust-lang/rust/pull/36214
7054 [36264]: https://github.com/rust-lang/rust/pull/36264
7055 [36266]: https://github.com/rust-lang/rust/pull/36266
7056 [36289]: https://github.com/rust-lang/rust/pull/36289
7057 [36338]: https://github.com/rust-lang/rust/pull/36338
7058 [36351]: https://github.com/rust-lang/rust/pull/36351
7059 [36355]: https://github.com/rust-lang/rust/pull/36355
7060 [36369]: https://github.com/rust-lang/rust/pull/36369
7061 [36372]: https://github.com/rust-lang/rust/pull/36372
7062 [36423]: https://github.com/rust-lang/rust/pull/36423
7063 [36482]: https://github.com/rust-lang/rust/pull/36482
7064 [36505]: https://github.com/rust-lang/rust/pull/36505
7065 [36524]: https://github.com/rust-lang/rust/pull/36524
7066 [36527]: https://github.com/rust-lang/rust/pull/36527
7067 [36551]: https://github.com/rust-lang/rust/pull/36551
7068 [36574]: https://github.com/rust-lang/rust/pull/36574
7069 [36586]: https://github.com/rust-lang/rust/pull/36586
7070 [36592]: https://github.com/rust-lang/rust/pull/36592
7071 [36631]: https://github.com/rust-lang/rust/pull/36631
7072 [36639]: https://github.com/rust-lang/rust/pull/36639
7073 [36721]: https://github.com/rust-lang/rust/pull/36721
7074 [36727]: https://github.com/rust-lang/rust/pull/36727
7075 [36730]: https://github.com/rust-lang/rust/pull/36730
7076 [36734]: https://github.com/rust-lang/rust/pull/36734
7077 [36754]: https://github.com/rust-lang/rust/pull/36754
7078 [36995]: https://github.com/rust-lang/rust/pull/36995
7079 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7080 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7081 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7082 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7083 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7084 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7085 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7086 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7087 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7088 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7089 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7090 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7091 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7092 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7093 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7094 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7095 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7096 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7097 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7098 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7099 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7100 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7101 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7102 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7103 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7104 [rustup]: https://www.rustup.rs
7105 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7106 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7107 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7108 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7109 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7110 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7111 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7114 Version 1.12.1 (2016-10-20)
7115 ===========================
7120 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7121 * [Confusion with double negation and booleans][36856]
7122 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7123 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7124 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7125 * [Corrupted memory after updated to 1.12][36936]
7126 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7127 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7128 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7130 [36381]: https://github.com/rust-lang/rust/issues/36381
7131 [36856]: https://github.com/rust-lang/rust/issues/36856
7132 [36875]: https://github.com/rust-lang/rust/issues/36875
7133 [36924]: https://github.com/rust-lang/rust/issues/36924
7134 [36926]: https://github.com/rust-lang/rust/issues/36926
7135 [36936]: https://github.com/rust-lang/rust/issues/36936
7136 [37026]: https://github.com/rust-lang/rust/issues/37026
7137 [37112]: https://github.com/rust-lang/rust/issues/37112
7138 [37153]: https://github.com/rust-lang/rust/issues/37153
7141 Version 1.12.0 (2016-09-29)
7142 ===========================
7147 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7148 This translation pass is far simpler than the previous AST->LLVM pass, and
7149 creates opportunities to perform new optimizations directly on the MIR. It
7150 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7151 * [`rustc` presents a new, more readable error format, along with
7152 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7153 Most common editors supporting Rust have been updated to work with it. It was
7154 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7159 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7160 This translation pass is far simpler than the previous AST->LLVM pass, and
7161 creates opportunities to perform new optimizations directly on the MIR. It
7162 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7163 * [Print the Rust target name, not the LLVM target name, with
7164 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7165 * [The computation of `TypeId` is correct in some cases where it was previously
7166 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7167 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7168 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7169 `--print relocation-models`, and `--print code-models` print the available
7170 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7171 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7172 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7173 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7174 These targets produce statically-linked binaries. There are no binary release
7180 * [`rustc` presents a new, more readable error format, along with
7181 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7182 Most common editors supporting Rust have been updated to work with it. It was
7183 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7184 * [In error descriptions, references are now described in plain English,
7185 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7186 * [In error type descriptions, unknown numeric types are named `{integer}` or
7187 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7188 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7193 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7194 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7195 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7196 useful](https://github.com/rust-lang/rust/pull/34908)
7197 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7198 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7199 * [Semicolons are properly required as statement delimiters inside
7200 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7201 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7206 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7207 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7208 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7209 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7210 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7211 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7212 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7213 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7214 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7215 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7216 Both on Unix and Windows.
7217 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7218 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7219 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7220 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7221 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7222 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7223 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7224 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7229 * [The `format!` macro and friends now allow a single argument to be formatted
7230 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7231 * [The lifetime bounds on `[T]::binary_search_by` and
7232 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7233 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7234 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7235 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7236 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7237 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7238 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7239 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7240 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7241 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7242 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7243 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7244 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7245 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7246 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7247 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7248 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7249 * [`mpsc::sync_channel` `Receiver`s return any available message before
7250 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7251 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7252 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7257 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7258 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7259 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7260 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7261 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7262 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7263 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7264 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7265 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7266 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7267 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7268 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7269 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7270 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7271 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7272 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7277 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7278 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7283 * [Test binaries now support a `--test-threads` argument to specify the number
7284 of threads used to run tests, and which acts the same as the
7285 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7286 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7287 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7288 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7289 * [Rust releases now come with source packages that can be installed by rustup
7290 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7291 The resulting source code can be used by tools and IDES, located in the
7292 sysroot under `lib/rustlib/src`.
7297 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7298 * Many minor improvements to the documentation.
7299 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7304 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7305 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7306 * [When formatting strings, if "precision" is specified, the "fill",
7307 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7308 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7311 Version 1.11.0 (2016-08-18)
7312 ===========================
7317 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7318 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7319 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7320 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7325 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7326 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7327 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7328 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7329 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7330 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7331 (in libcore - previously stabilized in libstd)
7332 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7333 (in libcore - previously stabilized in libstd)
7334 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7335 (in libcore - previously stabilized in libstd)
7336 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7337 (in libcore - previously stabilized in libstd)
7338 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7339 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7340 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7341 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7346 * [The `thread_local!` macro supports multiple definitions in a single
7347 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7348 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7349 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7350 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7351 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7352 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7353 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7354 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7359 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7360 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7361 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7362 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7363 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7364 and `-vv` prints warnings for all crates.
7365 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7366 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7367 This provides room for expansion by arbitrary tools.
7368 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7369 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7370 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7371 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7372 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7373 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7374 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7379 * [Caching projections speeds up type check dramatically for some
7380 workloads](https://github.com/rust-lang/rust/pull/33816)
7381 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7382 This hasher is faster, but is believed to provide sufficient
7383 protection from collision attacks.
7384 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7389 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7390 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7391 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7392 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7393 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7398 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7399 * [When emitting debug info, rustc emits frame pointers for closures,
7400 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7401 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7402 * Many more errors have been given error codes and extended
7404 * API documentation continues to be improved, with many new examples
7409 * [rustc no longer hangs when dependencies recursively re-export
7410 submodules](https://github.com/rust-lang/rust/pull/34542)
7411 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7412 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7413 rewritten](https://github.com/rust-lang/rust/pull/33895)
7414 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7415 No targets use this yet, but it works toward AVR support.
7420 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7421 * [The new follow-set rules that place restrictions on `macro_rules!`
7422 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7423 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7424 and has been a warning since 1.10.
7425 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7426 This causes breakage in some corner cases.
7429 Version 1.10.0 (2016-07-07)
7430 ===========================
7435 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7436 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7437 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7438 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7439 * [`panic!` can be converted to a runtime abort with the
7440 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7441 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7442 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7443 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7444 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7445 Note that Cargo does not yet directly support cdylibs.
7450 * `os::windows::fs::OpenOptionsExt::access_mode`
7451 * `os::windows::fs::OpenOptionsExt::share_mode`
7452 * `os::windows::fs::OpenOptionsExt::custom_flags`
7453 * `os::windows::fs::OpenOptionsExt::attributes`
7454 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7455 * `os::unix::fs::OpenOptionsExt::custom_flags`
7456 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7457 * `Default for sync::Weak`
7458 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7459 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7460 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7461 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7462 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7463 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7464 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7465 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7466 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7467 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7468 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7469 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7470 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7471 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7472 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7473 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7474 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7475 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7476 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7477 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7478 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7479 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7480 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7481 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7482 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7483 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7484 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7485 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7486 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7487 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7488 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7489 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7490 * Read/Write/RawFd impls for `UnixStream`
7491 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7492 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7493 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7494 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7495 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7496 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7497 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7498 * RawFd impls for `UnixListener`
7499 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7500 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7501 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7502 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7503 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7504 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7505 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7506 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7507 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7508 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7509 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7510 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7511 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7512 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7513 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7514 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7515 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7516 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7517 * RawFd impls for `UnixDatagram`
7518 * `{BTree,Hash}Map::values_mut`
7519 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7524 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7525 The semantics of this minor method are subtle and probably not what
7527 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7528 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7529 will fall back to `/dev/urandom` temporarily to avoid blocking
7530 during early boot](https://github.com/rust-lang/rust/pull/33086).
7531 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7532 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7533 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7534 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7535 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7536 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7537 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7541 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7542 This controls the runtime behavior of the `panic!` macro
7543 and can be either "unwind" (the default), or "abort".
7544 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7545 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7546 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7547 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7548 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7549 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7550 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7551 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7552 By default they are retried twice, which can be customized with the
7553 `net.retry` value in `.cargo/config`.
7554 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7555 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7556 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7557 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7558 Makes it possible to install multiple crates in parallel.
7559 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7560 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7561 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7562 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7563 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7564 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7569 * [rustc memory usage was reduced by refactoring the context used for
7570 type checking](https://github.com/rust-lang/rust/pull/33425).
7571 * [Speed up creation of `HashMap`s by caching the random keys used
7572 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7573 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7574 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7575 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7576 10x faster than the previous lookup tables.
7577 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7582 * Many incremental improvements to documentation and rustdoc.
7583 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7584 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7585 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7586 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7587 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7588 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7589 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7594 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7595 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7596 * [`std` no longer prints backtraces on platforms where the running
7597 module must be loaded with `env::current_exe`, which can't be relied
7598 on](https://github.com/rust-lang/rust/pull/33554).
7599 * This release includes std binaries for the i586-unknown-linux-gnu,
7600 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7601 i586 target is for old x86 hardware without SSE2, and the armv7
7602 target is for Android running on modern ARM architectures.
7603 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7604 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7605 * [On Unix the runtime aborts by calling `libc::abort` instead of
7606 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7607 * [Rust is now bootstrapped from the previous release of Rust,
7608 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7613 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7614 * [`target_env` for Linux ARM targets is just `gnu`, not
7615 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7616 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7617 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7618 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7619 Affects how macros are parsed.
7620 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7621 * [Feature-gated attributes on macro-generated macro invocations are
7622 now rejected](https://github.com/rust-lang/rust/pull/32791).
7623 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7624 This caused some minor changes to type inference.
7627 Version 1.9.0 (2016-05-26)
7628 ==========================
7633 * The `#[deprecated]` attribute when applied to an API will generate
7634 warnings when used. The warnings may be suppressed with
7635 `#[allow(deprecated)]`. [RFC 1270].
7636 * [`fn` item types are zero sized, and each `fn` names a unique
7637 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7638 `transmute` on a `fn` type will generate a warning for a few cycles,
7639 then will be converted to an error.
7640 * [Field and method resolution understand visibility, so private
7641 fields and methods cannot prevent the proper use of public fields
7642 and methods][1.9fv].
7643 * [The parser considers unicode codepoints in the
7644 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7650 * [`std::panic::catch_unwind`] (renamed from `recover`)
7651 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7652 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7653 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7654 * [`str::is_char_boundary`]
7655 * [`<*const T>::as_ref`]
7656 * [`<*mut T>::as_ref`]
7657 * [`<*mut T>::as_mut`]
7658 * [`AsciiExt::make_ascii_uppercase`]
7659 * [`AsciiExt::make_ascii_lowercase`]
7660 * [`char::decode_utf16`]
7661 * [`char::DecodeUtf16`]
7662 * [`char::DecodeUtf16Error`]
7663 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7664 * [`BTreeSet::take`]
7665 * [`BTreeSet::replace`]
7668 * [`HashSet::replace`]
7670 * [`OsString::with_capacity`]
7671 * [`OsString::clear`]
7672 * [`OsString::capacity`]
7673 * [`OsString::reserve`]
7674 * [`OsString::reserve_exact`]
7675 * [`OsStr::is_empty`]
7677 * [`std::os::unix::thread`]
7680 * [`JoinHandleExt::as_pthread_t`]
7681 * [`JoinHandleExt::into_pthread_t`]
7682 * [`HashSet::hasher`]
7683 * [`HashMap::hasher`]
7684 * [`CommandExt::exec`]
7685 * [`File::try_clone`]
7686 * [`SocketAddr::set_ip`]
7687 * [`SocketAddr::set_port`]
7688 * [`SocketAddrV4::set_ip`]
7689 * [`SocketAddrV4::set_port`]
7690 * [`SocketAddrV6::set_ip`]
7691 * [`SocketAddrV6::set_port`]
7692 * [`SocketAddrV6::set_flowinfo`]
7693 * [`SocketAddrV6::set_scope_id`]
7694 * [`slice::copy_from_slice`]
7695 * [`ptr::read_volatile`]
7696 * [`ptr::write_volatile`]
7697 * [`OpenOptions::create_new`]
7698 * [`TcpStream::set_nodelay`]
7699 * [`TcpStream::nodelay`]
7700 * [`TcpStream::set_ttl`]
7701 * [`TcpStream::ttl`]
7702 * [`TcpStream::set_only_v6`]
7703 * [`TcpStream::only_v6`]
7704 * [`TcpStream::take_error`]
7705 * [`TcpStream::set_nonblocking`]
7706 * [`TcpListener::set_ttl`]
7707 * [`TcpListener::ttl`]
7708 * [`TcpListener::set_only_v6`]
7709 * [`TcpListener::only_v6`]
7710 * [`TcpListener::take_error`]
7711 * [`TcpListener::set_nonblocking`]
7712 * [`UdpSocket::set_broadcast`]
7713 * [`UdpSocket::broadcast`]
7714 * [`UdpSocket::set_multicast_loop_v4`]
7715 * [`UdpSocket::multicast_loop_v4`]
7716 * [`UdpSocket::set_multicast_ttl_v4`]
7717 * [`UdpSocket::multicast_ttl_v4`]
7718 * [`UdpSocket::set_multicast_loop_v6`]
7719 * [`UdpSocket::multicast_loop_v6`]
7720 * [`UdpSocket::set_multicast_ttl_v6`]
7721 * [`UdpSocket::multicast_ttl_v6`]
7722 * [`UdpSocket::set_ttl`]
7723 * [`UdpSocket::ttl`]
7724 * [`UdpSocket::set_only_v6`]
7725 * [`UdpSocket::only_v6`]
7726 * [`UdpSocket::join_multicast_v4`]
7727 * [`UdpSocket::join_multicast_v6`]
7728 * [`UdpSocket::leave_multicast_v4`]
7729 * [`UdpSocket::leave_multicast_v6`]
7730 * [`UdpSocket::take_error`]
7731 * [`UdpSocket::connect`]
7732 * [`UdpSocket::send`]
7733 * [`UdpSocket::recv`]
7734 * [`UdpSocket::set_nonblocking`]
7739 * [`std::sync::Once` is poisoned if its initialization function
7741 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7742 * [Most types implement `fmt::Debug`][1.9db].
7743 * [The default buffer size used by `BufReader` and `BufWriter` was
7744 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7745 used by other languages.
7746 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7747 `Duration` additionally implements `*=` and `/=`][1.9ta].
7748 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7749 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7750 * [`Chain` implements `BufRead`][1.9ch].
7751 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7756 * [Cargo can now run concurrently][1.9cc].
7757 * [Top-level overrides allow specific revisions of crates to be
7758 overridden through the entire crate graph][1.9ct]. This is intended
7759 to make upgrades easier for large projects, by allowing crates to be
7760 forked temporarily until they've been upgraded and republished.
7761 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7762 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7763 on the commandline][1.9cf]. `rustc` arguments can also be specified
7764 in the `build.rustflags` configuration key.
7769 * [The time complexity of comparing variables for equivalence during type
7770 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7771 to major compilation time improvement in some scenarios.
7772 * [`ToString` is specialized for `str`, giving it the same performance
7773 as `to_owned`][1.9ts].
7774 * [Spawning processes with `Command::output` no longer creates extra
7776 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7777 for C-like enums][1.9cl].
7782 * [Passing the `--quiet` flag to a test runner will produce
7783 much-abbreviated output][1.9q].
7784 * The Rust Project now publishes std binaries for the
7785 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7786 `i586-pc-windows-msvc` targets.
7791 * [`std::sync::Once` is poisoned if its initialization function
7793 * [It is illegal to define methods with the same name in overlapping
7794 inherent `impl` blocks][1.9sn].
7795 * [`fn` item types are zero sized, and each `fn` names a unique
7796 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7797 `transmute` on a `fn` type will generate a warning for a few cycles,
7798 then will be converted to an error.
7799 * [Improvements to const evaluation may trigger new errors when integer
7800 literals are out of range][1.9ce].
7803 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7804 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7805 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7806 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7807 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7808 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7809 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7810 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7811 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7812 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7813 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7814 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7815 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7816 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7817 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7818 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7819 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7820 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7821 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7822 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7823 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7824 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7825 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7826 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7827 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7828 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7829 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7830 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7831 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7832 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7833 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7834 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7835 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7836 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7837 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7838 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7839 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7840 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7841 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7842 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7843 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7844 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7845 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7846 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7847 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7848 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7849 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7850 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7851 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7852 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7853 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7854 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7855 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7856 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7857 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7858 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7859 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7860 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7861 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7862 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7863 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7864 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7865 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7866 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7867 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7868 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7869 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7870 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7871 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7872 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7873 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7874 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7875 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7876 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7877 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7878 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7879 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7880 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7881 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7882 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7883 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7884 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7885 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7886 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7887 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7888 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7889 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7890 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7891 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7892 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7893 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7894 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7895 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7896 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7897 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7898 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7899 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7900 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7901 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7902 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7903 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7904 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7905 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7906 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7907 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7908 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7909 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7910 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7911 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7912 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7915 Version 1.8.0 (2016-04-14)
7916 ==========================
7921 * Rust supports overloading of compound assignment statements like
7922 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7923 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7924 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7926 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7927 addition to the non-braced form, `struct Foo;`. [RFC 218].
7933 * [`str::encode_utf16`] (renamed from `utf16_units`)
7934 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7937 * [`ptr::drop_in_place`]
7939 * [`time::SystemTime`]
7941 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7942 * [`Instant::elapsed`]
7943 * [`SystemTime::now`]
7944 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7945 * [`SystemTime::elapsed`]
7946 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7947 * [`SystemTimeError`]
7948 * [`SystemTimeError::duration`]
7949 * Various impls for `SystemTimeError`
7951 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7952 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7953 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7954 * [The `write!` and `writeln!` macros correctly emit errors if any of
7955 their arguments can't be formatted][1.8w].
7956 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7957 * [The Unix-specific `raw` modules, which contain a number of
7958 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7959 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7960 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7961 across platforms was making it difficult to implement `std`
7962 correctly. Those that need these definitions should use the `libc`
7964 * The Unix-specific `MetadataExt` traits, including
7965 `os::unix::fs::MetadataExt`, which expose values such as inode
7966 numbers [no longer return platform-specific types][1.8r], but
7967 instead return widened integers. [RFC 1415].
7968 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7969 * [Atomic loads and stores are not volatile][1.8a].
7970 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7975 * [Inlining hash functions lead to a 3% compile-time improvement in
7976 some workloads][1.8h].
7977 * When using jemalloc, its symbols are [unprefixed so that it
7978 overrides the libc malloc implementation][1.8h]. This means that for
7979 rustc, LLVM is now using jemalloc, which results in a 6%
7980 compile-time improvement on a specific workload.
7981 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7986 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7987 i686-pc-windows-msvc is now considered a tier-1 platform.
7988 * [The `--print targets` flag prints a list of supported targets][1.8t].
7989 * [The `--print cfg` flag prints the `cfg`s defined for the current
7991 * [`rustc` can be built with an new Cargo-based build system, written
7992 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7993 build system. To enable it configure with `configure --rustbuild`.
7994 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7995 variants while also indicating the total number of missing variants
7996 if more than 3][1.8m].
7997 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7998 * The Rust Project now publishes binary releases of the standard
7999 library for a number of tier-2 targets:
8000 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8001 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8002 `x86_64-rumprun-netbsd`. These can be installed with
8003 tools such as [multirust][1.8mr].
8008 * [`cargo init` creates a new Cargo project in the current
8009 directory][1.8ci]. It is otherwise like `cargo new`.
8010 * [Cargo has configuration keys for `-v` and
8011 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8012 `[term]` section of `.cargo/config`.
8013 * [Configuration keys that evaluate to strings or integers can be set
8014 via environment variables][1.8ce]. For example the `build.jobs` key
8015 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8016 precedence over config files.
8017 * [Target-specific dependencies support Rust `cfg` syntax for
8018 describing targets][1.8cfg] so that dependencies for multiple
8019 targets can be specified together. [RFC 1361].
8020 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8021 `RUSTDOC` take precedence over the `build.target-dir`,
8022 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
8023 * [The child process tree is killed on Windows when Cargo is
8025 * [The `build.target` configuration value sets the target platform,
8026 like `--target`][1.8ct].
8031 * [Unstable compiler flags have been further restricted][1.8u]. Since
8032 1.0 `-Z` flags have been considered unstable, and other flags that
8033 were considered unstable additionally required passing `-Z
8034 unstable-options` to access. Unlike unstable language and library
8035 features though, these options have been accessible on the stable
8036 release channel. Going forward, *new unstable flags will not be
8037 available on the stable release channel*, and old unstable flags
8038 will warn about their usage. In the future, all unstable flags will
8039 be unavailable on the stable release channel.
8040 * [It is no longer possible to `match` on empty enum variants using
8041 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8042 * The Unix-specific `MetadataExt` traits, including
8043 `os::unix::fs::MetadataExt`, which expose values such as inode
8044 numbers [no longer return platform-specific types][1.8r], but
8045 instead return widened integers. [RFC 1415].
8046 * [Modules sourced from the filesystem cannot appear within arbitrary
8047 blocks, but only within other modules][1.8mf].
8048 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8049 * On Unix, [stack overflow triggers a runtime abort instead of a
8051 * [`Command::spawn` and its equivalents return an error if any of
8052 its command-line arguments contain interior `NUL`s][1.8n].
8053 * [Tuple and unit enum variants from other crates are in the type
8055 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8056 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8057 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8058 instead of `foo.lib`.
8061 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8062 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8063 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8064 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8065 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8066 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8067 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8068 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8069 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8070 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8071 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8072 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
8073 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8074 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8075 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8076 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8077 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8078 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8079 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8080 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8081 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8082 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8083 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8084 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8085 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8086 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8087 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8088 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8089 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8090 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8091 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8092 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8093 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8094 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8095 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8096 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8097 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8098 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8099 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8100 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8101 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8102 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8103 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8104 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8105 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8106 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8107 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8108 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8109 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8110 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8111 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8112 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8113 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8114 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8115 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8116 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8117 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8118 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8119 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8120 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8123 Version 1.7.0 (2016-03-03)
8124 ==========================
8131 * [`Path::strip_prefix`] (renamed from relative_from)
8132 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8134 * [`Ipv4Addr::is_loopback`]
8135 * [`Ipv4Addr::is_private`]
8136 * [`Ipv4Addr::is_link_local`]
8137 * [`Ipv4Addr::is_multicast`]
8138 * [`Ipv4Addr::is_broadcast`]
8139 * [`Ipv4Addr::is_documentation`]
8141 * [`Ipv6Addr::is_unspecified`]
8142 * [`Ipv6Addr::is_loopback`]
8143 * [`Ipv6Addr::is_multicast`]
8146 * [`Vec::as_mut_slice`]
8148 * [`String::as_str`]
8149 * [`String::as_mut_str`]
8151 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8153 * `<[T]>::`[`sort_by_key`]
8154 * checked, saturated, and overflowing operations
8155 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8156 * [`i32::saturating_mul`]
8157 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8158 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8159 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8160 * [`u32::saturating_mul`]
8161 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8162 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8163 * and checked, saturated, and overflowing operations for other primitive types
8165 * [`ffi::IntoStringError`]
8166 * [`CString::into_string`]
8167 * [`CString::into_bytes`]
8168 * [`CString::into_bytes_with_nul`]
8169 * `From<CString> for Vec<u8>`
8171 * [`IntoStringError::into_cstring`]
8172 * [`IntoStringError::utf8_error`]
8173 * `Error for IntoStringError`
8175 * [`std::hash::BuildHasher`]
8176 * [`BuildHasher::Hasher`]
8177 * [`BuildHasher::build_hasher`]
8178 * [`std::hash::BuildHasherDefault`]
8179 * [`HashMap::with_hasher`]
8180 * [`HashMap::with_capacity_and_hasher`]
8181 * [`HashSet::with_hasher`]
8182 * [`HashSet::with_capacity_and_hasher`]
8183 * [`std::collections::hash_map::RandomState`]
8184 * [`RandomState::new`]
8185 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8186 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8187 from bytes is faster.
8188 * [The performance of `LineWriter` (and thus `io::stdout`) was
8189 improved by using `memchr` to search for newlines][1.7m].
8190 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8191 `f64` variants were stabilized previously.
8192 * [`BTreeMap` was rewritten to use less memory and improve the performance
8193 of insertion and iteration, the latter by as much as 5x][1.7bm].
8194 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8195 covariant over their contained type][1.7bt].
8196 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8197 over their contained type][1.7ll].
8198 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8200 * [`Any` is implemented for unsized types][1.7a].
8201 * [`Hash` is implemented for `Duration`][1.7h].
8206 * [When running tests with `--test`, rustdoc will pass `--cfg`
8207 arguments to the compiler][1.7dt].
8208 * [The compiler is built with RPATH information by default][1.7rpa].
8209 This means that it will be possible to run `rustc` when installed in
8210 unusual configurations without configuring the dynamic linker search
8212 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8213 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8214 over `LD_LIBRARY_PATH`.
8219 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8220 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8221 * [The `rerun-if-changed` build script directive no longer causes the
8222 build script to incorrectly run twice in certain scenarios][1.7rr].
8227 * Soundness fixes to the interactions between associated types and
8228 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8229 code that violates the new rules. This is a significant change that
8230 is known to break existing code, so it has emitted warnings for the
8231 new error cases since 1.4 to give crate authors time to adapt. The
8232 details of what is changing are subtle; read the RFC for more.
8233 * [Several bugs in the compiler's visibility calculations were
8234 fixed][1.7v]. Since this was found to break significant amounts of
8235 code, the new errors will be emitted as warnings for several release
8236 cycles, under the `private_in_public` lint.
8237 * Defaulted type parameters were accidentally accepted in positions
8238 that were not intended. In this release, [defaulted type parameters
8239 appearing outside of type definitions will generate a
8240 warning][1.7d], which will become an error in future releases.
8241 * [Parsing "." as a float results in an error instead of 0][1.7p].
8242 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8243 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8245 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8246 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8247 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8248 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8249 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8250 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8251 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8252 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8253 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8254 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8255 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8256 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8257 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8258 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8259 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8260 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8261 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8262 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8263 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8264 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8265 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8266 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8267 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8268 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8269 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8270 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8271 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8272 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8273 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8274 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8275 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8276 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8277 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8278 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8279 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8280 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8281 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8282 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8283 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8284 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8285 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8286 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8287 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8288 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8289 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8290 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8291 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8292 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8293 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8294 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8295 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8296 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8297 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8298 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8299 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8300 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8301 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8302 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8303 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8304 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8305 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8306 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8307 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8308 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8309 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8310 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8311 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8312 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8313 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8314 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8315 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8316 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8317 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8318 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8319 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8320 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8321 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8322 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8323 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8326 Version 1.6.0 (2016-01-21)
8327 ==========================
8332 * The `#![no_std]` attribute causes a crate to not be linked to the
8333 standard library, but only the [core library][1.6co], as described
8334 in [RFC 1184]. The core library defines common types and traits but
8335 has no platform dependencies whatsoever, and is the basis for Rust
8336 software in environments that cannot support a full port of the
8337 standard library, such as operating systems. Most of the core
8338 library is now stable.
8344 [`Read::read_exact`],
8345 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8346 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8347 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8348 [`os::unix::fs::DirBuilderExt`],
8349 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8350 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8351 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8352 [`collections::hash_map::Drain`],
8353 [`collections::hash_map::HashMap::drain`],
8354 [`collections::hash_set::Drain`],
8355 [`collections::hash_set::HashSet::drain`],
8356 [`collections::binary_heap::Drain`],
8357 [`collections::binary_heap::BinaryHeap::drain`],
8358 [`Vec::extend_from_slice`] (renamed from `push_all`),
8359 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8360 [`RwLock::into_inner`],
8361 [`Iterator::min_by_key`] (renamed from `min_by`),
8362 [`Iterator::max_by_key`] (renamed from `max_by`).
8363 * The [core library][1.6co] is stable, as are most of its APIs.
8364 * [The `assert_eq!` macro supports arguments that don't implement
8365 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8367 * Several timer functions that take duration in milliseconds [are
8368 deprecated in favor of those that take `Duration`][1.6ms]. These
8369 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8370 `thread::park_timeout_ms`.
8371 * The algorithm by which `Vec` reserves additional elements was
8372 [tweaked to not allocate excessive space][1.6a] while still growing
8374 * `From` conversions are [implemented from integers to floats][1.6f]
8375 in cases where the conversion is lossless. Thus they are not
8376 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8377 or `f64`. They are also not implemented for `isize` and `usize`
8378 because the implementations would be platform-specific. `From` is
8379 also implemented from `f32` to `f64`.
8380 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8381 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8382 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8383 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8385 * Sorting slices that are already sorted [is 50% faster in some
8391 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8392 * Cargo build scripts can specify their dependencies by emitting the
8393 [`rerun-if-changed`][1.6rr] key.
8394 * crates.io will reject publication of crates with dependencies that
8395 have a wildcard version constraint. Crates with wildcard
8396 dependencies were seen to cause a variety of problems, as described
8397 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8399 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8400 release folder. A variety of artifacts that Cargo failed to clean
8401 are now correctly deleted.
8406 * The `unreachable_code` lint [warns when a function call's argument
8408 * The parser indicates [failures that may be caused by
8409 confusingly-similar Unicode characters][1.6uc]
8410 * Certain macro errors [are reported at definition time][1.6m], not
8416 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8417 environment variable when locating crates. This was a pre-cargo
8418 feature for integrating with the package manager that was
8419 accidentally never removed.
8420 * [A number of bugs were fixed in the privacy checker][1.6p] that
8421 could cause previously-accepted code to break.
8422 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8423 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8424 struct pattern syntax (`Foo(..)`) can no longer be used to match
8425 unit structs. This is a warning now, but will become an error in
8426 future releases. Patterns that share the same name as a const are
8428 * A bug was fixed that causes [rustc not to apply default type
8429 parameters][1.6xc] when resolving certain method implementations of
8430 traits defined in other crates.
8432 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8433 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8434 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8435 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8436 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8437 [1.6co]: http://doc.rust-lang.org/core/index.html
8438 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8439 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8440 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8441 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8442 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8443 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8444 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8445 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8446 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8447 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8448 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8449 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8450 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8451 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8452 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8453 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8454 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8455 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8456 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8457 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8458 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8459 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8460 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8461 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8462 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8463 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8464 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8465 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8466 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8467 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8468 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8469 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8470 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8471 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8472 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8473 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8474 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8475 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8476 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8477 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8478 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8481 Version 1.5.0 (2015-12-10)
8482 ==========================
8484 * ~700 changes, numerous bugfixes
8490 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8491 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8492 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8493 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8494 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8495 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8496 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8497 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8498 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8499 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8500 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8501 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8502 [`Path::read_link`], [`Path::symlink_metadata`],
8503 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8504 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8505 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8506 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8507 [`slice::split_first_mut`], [`slice::split_first`],
8508 [`slice::split_last_mut`], [`slice::split_last`],
8509 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8510 [`str::MatchIndices`], [`str::RMatchIndices`],
8511 [`str::match_indices`], [`str::rmatch_indices`],
8512 [`str::slice_mut_unchecked`], [`string::ParseError`].
8513 * Rust applications hosted on crates.io can be installed locally to
8514 `~/.cargo/bin` with the [`cargo install`] command. Among other
8515 things this makes it easier to augment Cargo with new subcommands:
8516 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8517 invoked as `cargo foo`.
8518 * Crates with wildcard (`*`) dependencies will [emit warnings when
8519 published][1.5w]. In 1.6 it will no longer be possible to publish
8520 crates with wildcard dependencies.
8525 * The rules determining when a particular lifetime must outlive
8526 a particular value (known as '[dropck]') have been [modified
8527 to not rely on parametricity][1.5p].
8528 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8529 and `Arc`][1.5a]. Because these smart pointer types implement
8530 `Deref`, this causes breakage in cases where the interior type
8531 contains methods of the same name.
8532 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8533 that they could drop their content. Soundness fix.
8534 * All method invocations are [properly checked][1.5wf1] for
8535 [well-formedness][1.5wf2]. Soundness fix.
8536 * Traits whose supertraits contain `Self` are [not object
8537 safe][1.5o]. Soundness fix.
8538 * Target specifications support a [`no_default_libraries`][1.5nd]
8539 setting that controls whether `-nodefaultlibs` is passed to the
8540 linker, and in turn the `is_like_windows` setting no longer affects
8541 the `-nodefaultlibs` flag.
8542 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8543 * The `#[inline]` and `#[repr]` attributes [can only appear
8544 in valid locations][1.5at].
8545 * Native libraries linked from the local crate are [passed to
8546 the linker before native libraries from upstream crates][1.5nl].
8547 * Two rarely-used attributes, `#[no_debug]` and
8548 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8549 * Negation of unsigned integers, which has been a warning for
8550 several releases, [is now behind a feature gate and will
8551 generate errors][1.5nu].
8552 * The parser accidentally accepted visibility modifiers on
8553 enum variants, a bug [which has been fixed][1.5ev].
8554 * [A bug was fixed that allowed `use` statements to import unstable
8560 * When evaluating expressions at compile-time that are not
8561 compile-time constants (const-evaluating expressions in non-const
8562 contexts), incorrect code such as overlong bitshifts and arithmetic
8563 overflow will [generate a warning instead of an error][1.5ce],
8564 delaying the error until runtime. This will allow the
8565 const-evaluator to be expanded in the future backwards-compatibly.
8566 * The `improper_ctypes` lint [no longer warns about using `isize` and
8567 `usize` in FFI][1.5ict].
8572 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8574 * `Default` is [implemented for mutable slices][1.5d].
8575 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8576 * There are now `From` conversions [between floating point
8577 types][1.5f] where the conversions are lossless.
8578 * There are now `From` conversions [between integer types][1.5i] where
8579 the conversions are lossless.
8580 * [`fs::Metadata` implements `Clone`][1.5fs].
8581 * The `parse` method [accepts a leading "+" when parsing
8583 * [`AsMut` is implemented for `Vec`][1.5am].
8584 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8585 been optimized][1.5cf] and no longer rely on the default impl.
8586 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8587 `unsafe extern "C"` function types now [implement `Clone`,
8588 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8589 `fmt::Debug` for up to 12 arguments][1.5fp].
8590 * [Dropping `Vec`s is much faster in unoptimized builds when the
8591 element types don't implement `Drop`][1.5dv].
8592 * A bug that caused in incorrect behavior when [combining `VecDeque`
8593 with zero-sized types][1.5vdz] was resolved.
8594 * [`PartialOrd` for slices is faster][1.5po].
8599 * [Crate metadata size was reduced by 20%][1.5md].
8600 * [Improvements to code generation reduced the size of libcore by 3.3
8601 MB and rustc's memory usage by 18MB][1.5m].
8602 * [Improvements to deref translation increased performance in
8603 unoptimized builds][1.5dr].
8604 * Various errors in trait resolution [are deduplicated to only be
8605 reported once][1.5te].
8606 * Rust has preliminary [support for rumprun kernels][1.5rr].
8607 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8609 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8610 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8611 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8612 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8613 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8614 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8615 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8616 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8617 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8618 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8619 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8620 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8621 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8622 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8623 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8624 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8625 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8626 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8627 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8628 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8629 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8630 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8631 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8632 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8633 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8634 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8635 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8636 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8637 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8638 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8639 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8640 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8641 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8642 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8643 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8644 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8645 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8646 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8647 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8648 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8649 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8650 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8651 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8652 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8653 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8654 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8655 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8656 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8657 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8658 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8659 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8660 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8661 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8662 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8663 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8664 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8665 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8666 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8667 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8668 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8669 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8670 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8671 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8672 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8673 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8674 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8675 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8676 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8677 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8678 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8679 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8680 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8681 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8682 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8683 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8684 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8685 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8686 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8687 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8688 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8689 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8690 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8691 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8692 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8693 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8694 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8695 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8696 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8697 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8699 Version 1.4.0 (2015-10-29)
8700 ==========================
8702 * ~1200 changes, numerous bugfixes
8707 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8708 GNU) are now supported and recommended for use.
8713 * [Several changes have been made to fix type soundness and improve
8714 the behavior of associated types][sound]. See [RFC 1214]. Although
8715 we have mostly introduced these changes as warnings this release, to
8716 become errors next release, there are still some scenarios that will
8717 see immediate breakage.
8718 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8719 line breaks in addition to `\n`][crlf].
8720 * [Loans of `'static` lifetime extend to the end of a function][stat].
8721 * [`str::parse` no longer introduces avoidable rounding error when
8722 parsing floating point numbers. Together with earlier changes to
8723 float formatting/output, "round trips" like f.to_string().parse()
8724 now preserve the value of f exactly. Additionally, leading plus
8725 signs are now accepted][fp3].
8731 * `use` statements that import multiple items [can now rename
8732 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8733 * [Binops work correctly on fat pointers][binfat].
8734 * `pub extern crate`, which does not behave as expected, [issues a
8735 warning][pec] until a better solution is found.
8740 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8741 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8742 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8743 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8744 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8745 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8746 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8747 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8748 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8749 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8750 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8751 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8752 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8753 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8754 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8755 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8756 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8757 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8759 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8760 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8761 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8762 `f64::from_str_radix`.
8763 * [Reverse-searching strings is faster with the 'two-way'
8765 * [`std::io::copy` allows `?Sized` arguments][cc].
8766 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8767 [override `count`, `nth` and `last` with an *O*(1)
8768 implementation][it].
8769 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8770 * [`IntoRawFd` has been added to the Unix-specific prelude,
8771 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8773 * [`Extend<String>` and `FromIterator<String` are both implemented for
8775 * [`IntoIterator` is implemented for references to `Option` and
8777 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8778 Copy`][ext] as part of [RFC 839]. This will cause type inference
8779 breakage in rare situations.
8780 * [`BinaryHeap` implements `Debug`][bh2].
8781 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8783 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8784 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8785 * [String comparison is faster][faststr].
8786 * `&mut T` where `T: std::fmt::Write` [also implements
8787 `std::fmt::Write`][mutw].
8788 * [A stable regression in `VecDeque::push_back` and other
8789 capacity-altering methods that caused panics for zero-sized types
8791 * [Function pointers implement traits for up to 12 parameters][fp2].
8796 * The compiler [no longer uses the 'morestack' feature to prevent
8797 stack overflow][mm]. Instead it uses guard pages and stack
8798 probes (though stack probes are not yet implemented on any platform
8800 * [The compiler matches traits faster when projections are involved][p].
8801 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8803 * [Cargo now displays useful information about what its doing during
8804 `cargo update`][cu].
8806 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8807 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8808 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8809 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8810 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8811 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8812 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8813 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8814 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8815 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8816 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8817 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8818 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8819 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8820 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8821 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8822 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8823 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8824 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8825 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8826 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8827 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8828 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8829 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8830 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8831 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8832 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8833 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8834 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8835 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8836 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8837 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8838 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8839 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8840 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8841 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8842 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8843 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8844 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8845 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8846 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8847 [bh2]: https://github.com/rust-lang/rust/pull/28156
8848 [binfat]: https://github.com/rust-lang/rust/pull/28270
8849 [bm]: https://github.com/rust-lang/rust/pull/28197
8850 [cc]: https://github.com/rust-lang/rust/pull/27531
8851 [crlf]: https://github.com/rust-lang/rust/pull/28034
8852 [cu]: https://github.com/rust-lang/cargo/pull/1931
8853 [d]: https://github.com/rust-lang/rust/pull/27825
8854 [dep]: https://github.com/rust-lang/rust/pull/28339
8855 [es]: https://github.com/rust-lang/rust/pull/27956
8856 [ext]: https://github.com/rust-lang/rust/pull/28094
8857 [faststr]: https://github.com/rust-lang/rust/pull/28338
8858 [ffi]: https://github.com/rust-lang/rust/pull/28779
8859 [fp]: https://github.com/rust-lang/rust/pull/28268
8860 [fp2]: https://github.com/rust-lang/rust/pull/28560
8861 [fp3]: https://github.com/rust-lang/rust/pull/27307
8862 [i]: https://github.com/rust-lang/rust/pull/27451
8863 [into2]: https://github.com/rust-lang/rust/pull/28039
8864 [it]: https://github.com/rust-lang/rust/pull/27652
8865 [mm]: https://github.com/rust-lang/rust/pull/27338
8866 [mutw]: https://github.com/rust-lang/rust/pull/28368
8867 [sound]: https://github.com/rust-lang/rust/pull/27641
8868 [p]: https://github.com/rust-lang/rust/pull/27866
8869 [pec]: https://github.com/rust-lang/rust/pull/28486
8870 [pr]: https://github.com/rust-lang/rust/pull/27896
8871 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8872 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8873 [s]: https://github.com/rust-lang/rust/pull/27474
8874 [stab]: https://github.com/rust-lang/rust/pull/28339
8875 [stat]: https://github.com/rust-lang/rust/pull/28321
8876 [vd]: https://github.com/rust-lang/rust/pull/28494
8878 Version 1.3.0 (2015-09-17)
8879 ==============================
8881 * ~900 changes, numerous bugfixes
8886 * The [new object lifetime defaults][nold] have been [turned
8887 on][nold2] after a cycle of warnings about the change. Now types
8888 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8889 being interpreted as `&'a Box<Trait+'a>` to `&'a
8890 Box<Trait+'static>`.
8891 * [The Rustonomicon][nom] is a new book in the official documentation
8892 that dives into writing unsafe Rust.
8893 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8894 timekeeping is employed by other std APIs, as well as out-of-tree
8900 * The [new object lifetime defaults][nold] have been [turned
8901 on][nold2] after a cycle of warnings about the change.
8902 * There is a known [regression][lr] in how object lifetime elision is
8903 interpreted, the proper solution for which is undetermined.
8904 * The `#[prelude_import]` attribute, an internal implementation
8905 detail, was accidentally stabilized previously. [It has been put
8906 behind the `prelude_import` feature gate][pi]. This change is
8907 believed to break no existing code.
8908 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8909 [more sane for dynamically sized types][dst3]. Code that relied on
8910 the previous behavior is thought to be broken.
8911 * The `dropck` rules, which checks that destructors can't access
8912 destroyed values, [have been updated][dropck] to match the
8913 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8914 cause some previously-compiling code to no longer build.
8919 * The [new object lifetime defaults][nold] have been [turned
8920 on][nold2] after a cycle of warnings about the change.
8921 * Semicolons may [now follow types and paths in
8922 macros](https://github.com/rust-lang/rust/pull/27000).
8923 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8924 [more sane for dynamically sized types][dst3]. Code that relied on
8925 the previous behavior is not known to exist, and suspected to be
8927 * `'static` variables [may now be recursive][st].
8928 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8929 implementations correctly.
8930 * The `dropck` rules, which checks that destructors can't access
8931 destroyed values, [have been updated][dropck] to match the
8937 * The [`Duration`] API, [has been stabilized][ds], as well as the
8938 `std::time` module, which presently contains only `Duration`.
8939 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8940 * The owned C string, [`CString`], implements [`Borrow`] and the
8941 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8942 these allow C strings to be borrowed and cloned in generic code.
8943 * [`CStr`] implements [`Debug`].
8944 * [`AtomicPtr`] implements [`Debug`].
8945 * [`Error`] trait objects [can be downcast to their concrete types][e]
8946 in many common configurations, using the [`is`], [`downcast`],
8947 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8949 * Searching for substrings now [employs the two-way algorithm][search]
8950 instead of doing a naive search. This gives major speedups to a
8951 number of methods, including [`contains`][sc], [`find`][sf],
8952 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8953 [`ends_with`][sew] are also faster.
8954 * The performance of `PartialEq` for slices is [much faster][ps].
8955 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8956 is overridden and optimized by the implementations for scalars.
8957 * The [`Hasher`] trait now has a number of specialized `write_*`
8958 methods for primitive types, for efficiency.
8959 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8960 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8961 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8962 of [`std::error::Error::cause`][iec] also delegates to the inner
8964 * [`process::Child`][pc] gained the [`id`] method, which returns a
8965 `u32` representing the platform-specific process identifier.
8966 * The [`connect`] method on slices is deprecated, replaced by the new
8967 [`join`] method (note that both of these are on the *unstable*
8968 [`SliceConcatExt`] trait, but through the magic of the prelude are
8969 available to stable code anyway).
8970 * The [`Div`] operator is implemented for [`Wrapping`] types.
8971 * [`DerefMut` is implemented for `String`][dms].
8972 * Performance of SipHash (the default hasher for `HashMap`) is
8973 [better for long data][sh].
8974 * [`AtomicPtr`] implements [`Send`].
8975 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8976 are now [specialized to use uninitialized buffers for increased
8978 * Lifetime parameters of foreign functions [are now resolved
8984 * Rust can now, with some coercion, [produce programs that run on
8985 Windows XP][xp], though XP is not considered a supported platform.
8986 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8987 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8988 recommended for use in 1.3, though should be fully-functional
8989 in the [64-bit 1.4 beta][b14].
8990 * On Fedora-based systems installation will [properly configure the
8991 dynamic linker][fl].
8992 * The compiler gained many new extended error descriptions, which can
8993 be accessed with the `--explain` flag.
8994 * The `dropck` pass, which checks that destructors can't access
8995 destroyed values, [has been rewritten][dropck]. This fixes some
8996 soundness holes, and as such will cause some previously-compiling
8997 code to no longer build.
8998 * `rustc` now uses [LLVM to write archive files where possible][ar].
8999 Eventually this will eliminate the compiler's dependency on the ar
9001 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
9002 supported FreeBSD on x86_64).
9003 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9004 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9006 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9007 will kill the process instead of leaking][nlp].
9009 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9010 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9011 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9012 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9013 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9014 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9015 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9016 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9017 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9018 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9019 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9020 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9021 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9022 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9023 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9024 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9025 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9026 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9027 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9028 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9029 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9030 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9031 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9032 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9033 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9034 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9035 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9036 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9037 [ar]: https://github.com/rust-lang/rust/pull/26926
9038 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9039 [dms]: https://github.com/rust-lang/rust/pull/26241
9040 [dropck]: https://github.com/rust-lang/rust/pull/27261
9041 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9042 [ds]: https://github.com/rust-lang/rust/pull/26818
9043 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9044 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9045 [dst3]: https://github.com/rust-lang/rust/pull/27351
9046 [e]: https://github.com/rust-lang/rust/pull/24793
9047 [f]: https://github.com/rust-lang/rust/pull/26588
9048 [fb]: https://github.com/rust-lang/rust/pull/26959
9049 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9050 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9051 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9052 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9053 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9054 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9055 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9056 [lic]: https://github.com/rust-lang/rust/pull/26583
9057 [lnu]: https://github.com/rust-lang/rust/pull/27026
9058 [lr]: https://github.com/rust-lang/rust/issues/27248
9059 [lum]: https://github.com/rust-lang/rust/pull/26378
9060 [lur]: https://github.com/rust-lang/rust/pull/26783
9061 [nlp]: https://github.com/rust-lang/rust/pull/27176
9062 [nold2]: https://github.com/rust-lang/rust/pull/27045
9063 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9064 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9065 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9066 [pi]: https://github.com/rust-lang/rust/pull/26699
9067 [ps]: https://github.com/rust-lang/rust/pull/26884
9068 [rte]: https://github.com/rust-lang/rust/pull/26950
9069 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9070 [search]: https://github.com/rust-lang/rust/pull/26327
9071 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9072 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9073 [sh]: https://github.com/rust-lang/rust/pull/27280
9074 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9075 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9076 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9077 [st]: https://github.com/rust-lang/rust/pull/26630
9078 [win1]: https://github.com/rust-lang/rust/pull/26569
9079 [win2]: https://github.com/rust-lang/rust/pull/26741
9080 [win3]: https://github.com/rust-lang/rust/pull/26741
9081 [win4]: https://github.com/rust-lang/rust/pull/27210
9082 [xp]: https://github.com/rust-lang/rust/pull/26569
9084 Version 1.2.0 (2015-08-07)
9085 ==========================
9087 * ~1200 changes, numerous bugfixes
9092 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9093 like `Rc` to contain types without a fixed size, arrays and trait
9094 objects, finally enabling use of `Rc<[T]>` and completing the
9095 implementation of DST.
9096 * [Parallel codegen][parcodegen] is now working again, which can
9097 substantially speed up large builds in debug mode; It also gets
9098 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9099 jobs). It's not enabled by default, but will be "in the near
9100 future". It can be activated with the `-C codegen-units=N` flag to
9102 * This is the first release with [experimental support for linking
9103 with the MSVC linker and lib C on Windows (instead of using the GNU
9104 variants via MinGW)][win]. It is yet recommended only for the most
9105 intrepid Rustaceans.
9106 * Benchmark compilations are showing a 30% improvement in
9107 bootstrapping over 1.1.
9112 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9113 unicode case mapping, which is a previously-planned change in
9114 behavior and considered a bugfix.
9115 * [`mem::align_of`] now specifies [the *minimum alignment* for
9116 T][align], which is usually the alignment programs are interested
9117 in, and the same value reported by clang's
9118 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9120 * [The `#[packed]` attribute is no longer silently accepted by the
9121 compiler][packed]. This attribute did nothing and code that
9122 mentioned it likely did not work as intended.
9123 * Associated type defaults are [now behind the
9124 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9125 defaults *did not work*, but could be mentioned syntactically. As
9126 such this breakage has minimal impact.
9131 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9132 matching against dereferenceable values.
9137 * The [`Extend`] trait, which grows a collection from an iterator, is
9138 implemented over iterators of references, for `String`, `Vec`,
9139 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9140 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9141 * The [`iter::once`] function returns an iterator that yields a single
9142 element, and [`iter::empty`] returns an iterator that yields no
9144 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9145 over substring matches.
9146 * [`Cell`] and [`RefCell`] both implement `Eq`.
9147 * A number of methods for wrapping arithmetic are added to the
9148 integral types, [`wrapping_div`], [`wrapping_rem`],
9149 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9150 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9151 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9152 type.. It is illegal for the default arithmetic operations in Rust
9153 to overflow; the desire to wrap must be explicit.
9154 * The `{:#?}` formatting specifier [displays the alternate,
9155 pretty-printed][debugfmt] form of the `Debug` formatter. This
9156 feature was actually introduced prior to 1.0 with little
9158 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9159 for writing data to formatted strings, similar to [`io::Write`].
9160 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9161 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9162 are used by code generators to emit implementations of [`Debug`].
9163 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9164 methods that convert case, following Unicode case mapping.
9165 * It is now easier to handle poisoned locks. The [`PoisonError`]
9166 type, returned by failing lock operations, exposes `into_inner`,
9167 `get_ref`, and `get_mut`, which all give access to the inner lock
9168 guard, and allow the poisoned lock to continue to operate. The
9169 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9170 poisoned lock without attempting to take the lock.
9171 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9172 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9173 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9174 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9176 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9182 * `rustc` employs smarter heuristics for guessing at [typos].
9183 * `rustc` emits more efficient code for [no-op conversions between
9184 unsafe pointers][nop].
9185 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9186 resulting in faster compile times and smaller code.
9188 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9189 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9190 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9191 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9192 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9193 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9194 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9195 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9196 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9197 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9198 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9199 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9200 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9201 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9202 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9203 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9204 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9205 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9206 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9207 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9208 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9209 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9210 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9211 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9212 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9213 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9214 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9215 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9216 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9217 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9218 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9219 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9220 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9221 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9222 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9223 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9224 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9225 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9226 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9227 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9228 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9229 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9230 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9231 [align]: https://github.com/rust-lang/rust/pull/25646
9232 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9233 [typos]: https://github.com/rust-lang/rust/pull/26087
9234 [nop]: https://github.com/rust-lang/rust/pull/26336
9235 [fat]: https://github.com/rust-lang/rust/pull/26411
9236 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9237 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9238 [packed]: https://github.com/rust-lang/rust/pull/25541
9239 [ad]: https://github.com/rust-lang/rust/pull/27382
9240 [win]: https://github.com/rust-lang/rust/pull/25350
9242 Version 1.1.0 (2015-06-25)
9243 =========================
9245 * ~850 changes, numerous bugfixes
9250 * The [`std::fs` module has been expanded][fs] to expand the set of
9251 functionality exposed:
9252 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9253 don't incur a syscall on some platforms.
9254 * A `symlink_metadata` function has been added.
9255 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9256 access to all underlying information.
9257 * The compiler now contains extended explanations of many errors. When an error
9258 with an explanation occurs the compiler suggests using the `--explain` flag
9259 to read the explanation. Error explanations are also [available online][err-index].
9260 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9261 well as other work, the time to bootstrap the compiler decreased by
9267 * The [`str::split_whitespace`] method splits a string on unicode
9268 whitespace boundaries.
9269 * On both Windows and Unix, new extension traits provide conversion of
9270 I/O types to and from the underlying system handles. On Unix, these
9271 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9272 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9273 `TcpListener`, and `UpdSocket`. Further implementations for
9274 `std::process` will be stabilized later.
9275 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9276 Windows, symlinks can be created with
9277 `std::os::windows::symlink_dir` and
9278 `std::os::windows::symlink_file`.
9279 * The `mpsc::Receiver` type can now be converted into an iterator with
9280 `into_iter` on the [`IntoIterator`] trait.
9281 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9282 implementation of the [`From`] trait.
9283 * The `Debug` implementation for `RangeFull` [creates output that is
9284 more consistent with other implementations][rf].
9285 * [`Debug` is implemented for `File`][file].
9286 * The `Default` implementation for `Arc` [no longer requires `Sync +
9288 * [The `Iterator` methods `count`, `nth`, and `last` have been
9289 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9290 * Incorrect handling of paths on Windows has been improved in both the
9291 compiler and the standard library.
9292 * [`AtomicPtr` gained a `Default` implementation][ap].
9293 * In accordance with Rust's policy on arithmetic overflow `abs` now
9294 [panics on overflow when debug assertions are enabled][abs].
9295 * The [`Cloned`] iterator, which was accidentally left unstable for
9296 1.0 [has been stabilized][c].
9297 * The [`Incoming`] iterator, which iterates over incoming TCP
9298 connections, and which was accidentally unnamable in 1.0, [is now
9299 properly exported][inc].
9300 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9301 `sift_up` or `sift_down` panic][bh].
9302 * The [`split_off`] method of `LinkedList` [no longer corrupts
9303 the list in certain scenarios][ll].
9308 * Type checking performance [has improved notably][sk] with
9309 [multiple improvements][pre].
9310 * The compiler [suggests code changes][ch] for more errors.
9311 * rustc and it's build system have experimental support for [building
9312 toolchains against MUSL][m] instead of glibc on Linux.
9313 * The compiler defines the `target_env` cfg value, which is used for
9314 distinguishing toolchains that are otherwise for the same
9315 platform. Presently this is set to `gnu` for common GNU Linux
9316 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9317 * The [`cargo rustc`][crc] command invokes a build with custom flags
9319 * [Android executables are always position independent][pie].
9320 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9323 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9324 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9325 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9326 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9327 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9328 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9329 [rf]: https://github.com/rust-lang/rust/pull/24491
9330 [err-index]: https://doc.rust-lang.org/error-index.html
9331 [sk]: https://github.com/rust-lang/rust/pull/24615
9332 [pre]: https://github.com/rust-lang/rust/pull/25323
9333 [file]: https://github.com/rust-lang/rust/pull/24598
9334 [ch]: https://github.com/rust-lang/rust/pull/24683
9335 [arc]: https://github.com/rust-lang/rust/pull/24695
9336 [si]: https://github.com/rust-lang/rust/pull/24701
9337 [ap]: https://github.com/rust-lang/rust/pull/24834
9338 [m]: https://github.com/rust-lang/rust/pull/24777
9339 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9340 [crc]: https://github.com/rust-lang/cargo/pull/1568
9341 [pie]: https://github.com/rust-lang/rust/pull/24953
9342 [abs]: https://github.com/rust-lang/rust/pull/25441
9343 [c]: https://github.com/rust-lang/rust/pull/25496
9344 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9345 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9346 [inc]: https://github.com/rust-lang/rust/pull/25522
9347 [bh]: https://github.com/rust-lang/rust/pull/25856
9348 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9349 [ll]: https://github.com/rust-lang/rust/pull/26022
9350 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9351 [drop]: https://github.com/rust-lang/rust/pull/24935
9353 Version 1.0.0 (2015-05-15)
9354 ========================
9356 * ~1500 changes, numerous bugfixes
9361 * The vast majority of the standard library is now `#[stable]`. It is
9362 no longer possible to use unstable features with a stable build of
9364 * Many popular crates on [crates.io] now work on the stable release
9366 * Arithmetic on basic integer types now [checks for overflow in debug
9372 * Several [restrictions have been added to trait coherence][coh] in
9373 order to make it easier for upstream authors to change traits
9374 without breaking downstream code.
9375 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9376 improve error messages and macro behavior. For example, `0b1234` is
9377 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9378 * Trait bounds [are always invariant][inv], eliminating the need for
9379 the `PhantomFn` and `MarkerTrait` lang items, which have been
9381 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9382 "foo" as bar` syntax has been replaced with `extern crate foo as
9383 bar`, and Cargo now automatically translates "-" in *package* names
9384 to underscore for the crate name.
9385 * [Lifetime shadowing is an error][lt].
9386 * [`Send` no longer implies `'static`][send-rfc].
9387 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9388 `MyType::default()`.
9389 * Primitive types [now have inherent methods][prim-inherent],
9390 obviating the need for extension traits like `SliceExt`.
9391 * Methods with `Self: Sized` in their `where` clause are [considered
9392 object-safe][self-sized], allowing many extension traits like
9393 `IteratorExt` to be merged into the traits they extended.
9394 * You can now [refer to associated types][assoc-where] whose
9395 corresponding trait bounds appear only in a `where` clause.
9396 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9397 like `Send` and `Sync` are now library-defined.
9398 * A [Reflect trait][reflect] was introduced, which means that
9399 downcasting via the `Any` trait is effectively limited to concrete
9400 types. This helps retain the potentially-important "parametricity"
9401 property: generic code cannot behave differently for different type
9402 arguments except in minor ways.
9403 * The `unsafe_destructor` feature is now deprecated in favor of the
9404 [new `dropck`][dropck]. This change is a major reduction in unsafe
9410 * The `thread_local` module [has been renamed to `std::thread`][th].
9411 * The methods of `IteratorExt` [have been moved to the `Iterator`
9413 * Several traits that implement Rust's conventions for type
9414 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9415 [centralized in the `std::convert` module][con].
9416 * The `FromError` trait [was removed in favor of `From`][fe].
9417 * The basic sleep function [has moved to
9418 `std::thread::sleep_ms`][slp].
9419 * The `splitn` function now takes an `n` parameter that represents the
9420 number of items yielded by the returned iterator [instead of the
9421 number of 'splits'][spl].
9422 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9423 * [Derived implementations of `PartialOrd` now order enums according
9424 to their explicitly-assigned discriminants][po].
9425 * [Methods for searching strings are generic over `Pattern`s][pat],
9426 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9428 * [In method resolution, object methods are resolved before inherent
9430 * [`String::from_str` has been deprecated in favor of the `From` impl,
9431 `String::from`][sf].
9432 * [`io::Error` implements `Sync`][ios].
9433 * [The `words` method on `&str` has been replaced with
9434 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9436 * The new path and IO modules are complete and `#[stable]`. This
9437 was the major library focus for this cycle.
9438 * The path API was [revised][path-normalize] to normalize `.`,
9439 adjusting the tradeoffs in favor of the most common usage.
9440 * A large number of remaining APIs in `std` were also stabilized
9441 during this cycle; about 75% of the non-deprecated API surface
9443 * The new [string pattern API][string-pattern] landed, which makes
9444 the string slice API much more internally consistent and flexible.
9445 * A new set of [generic conversion traits][conversion] replaced
9446 many existing ad hoc traits.
9447 * Generic numeric traits were [completely removed][num-traits]. This
9448 was made possible thanks to inherent methods for primitive types,
9449 and the removal gives maximal flexibility for designing a numeric
9450 hierarchy in the future.
9451 * The `Fn` traits are now related via [inheritance][fn-inherit]
9452 and provide ergonomic [blanket implementations][fn-blanket].
9453 * The `Index` and `IndexMut` traits were changed to
9454 [take the index by value][index-value], enabling code like
9455 `hash_map["string"]` to work.
9456 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9457 `Copy` data is known to be `Clone` as well.
9462 * Many errors now have extended explanations that can be accessed with
9463 the `--explain` flag to `rustc`.
9464 * Many new examples have been added to the standard library
9466 * rustdoc has received a number of improvements focused on completion
9468 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9469 * Much headway was made on ecosystem-wide CI, making it possible
9470 to [compare builds for breakage][ci-compare].
9473 [crates.io]: http://crates.io
9474 [clo]: https://github.com/rust-lang/rust/pull/24034
9475 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9476 [con]: https://github.com/rust-lang/rust/pull/23875
9477 [cr]: https://github.com/rust-lang/rust/pull/23419
9478 [fe]: https://github.com/rust-lang/rust/pull/23879
9479 [ie]: https://github.com/rust-lang/rust/pull/23300
9480 [inv]: https://github.com/rust-lang/rust/pull/23938
9481 [ios]: https://github.com/rust-lang/rust/pull/24133
9482 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9483 [lt]: https://github.com/rust-lang/rust/pull/24057
9484 [meth]: https://github.com/rust-lang/rust/pull/24056
9485 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9486 [po]: https://github.com/rust-lang/rust/pull/24270
9487 [sf]: https://github.com/rust-lang/rust/pull/24517
9488 [slp]: https://github.com/rust-lang/rust/pull/23949
9489 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9490 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9491 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9492 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9493 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9494 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9495 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9496 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9497 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9498 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9499 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9500 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9501 [reflect]: https://github.com/rust-lang/rust/pull/23712
9502 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9503 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9504 [index-value]: https://github.com/rust-lang/rust/pull/23601
9505 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9506 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9507 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9508 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9509 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9510 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9513 Version 1.0.0-alpha.2 (2015-02-20)
9514 =====================================
9516 * ~1300 changes, numerous bugfixes
9520 * The various I/O modules were [overhauled][io-rfc] to reduce
9521 unnecessary abstractions and provide better interoperation with
9522 the underlying platform. The old `io` module remains temporarily
9524 * The standard library now [participates in feature gating][feat],
9525 so use of unstable libraries now requires a `#![feature(...)]`
9526 attribute. The impact of this change is [described on the
9527 forum][feat-forum]. [RFC][feat-rfc].
9531 * `for` loops [now operate on the `IntoIterator` trait][into],
9532 which eliminates the need to call `.iter()`, etc. to iterate
9533 over collections. There are some new subtleties to remember
9534 though regarding what sort of iterators various types yield, in
9535 particular that `for foo in bar { }` yields values from a move
9536 iterator, destroying the original collection. [RFC][into-rfc].
9537 * Objects now have [default lifetime bounds][obj], so you don't
9538 have to write `Box<Trait+'static>` when you don't care about
9539 storing references. [RFC][obj-rfc].
9540 * In types that implement `Drop`, [lifetimes must outlive the
9541 value][drop]. This will soon make it possible to safely
9542 implement `Drop` for types where `#[unsafe_destructor]` is now
9543 required. Read the [gorgeous RFC][drop-rfc] for details.
9544 * The fully qualified <T as Trait>::X syntax lets you set the Self
9545 type for a trait method or associated type. [RFC][ufcs-rfc].
9546 * References to types that implement `Deref<U>` now [automatically
9547 coerce to references][deref] to the dereferenced type `U`,
9548 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9549 should eliminate many unsightly uses of `&*`, as when converting
9550 from references to vectors into references to
9551 slices. [RFC][deref-rfc].
9552 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9553 `|:|`) is obsolete and closure kind is inferred from context.
9554 * [`Self` is a keyword][Self].
9558 * The `Show` and `String` formatting traits [have been
9559 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9560 their related purposes. Automatically getting a string
9561 conversion to use with `format!("{:?}", something_to_debug)` is
9562 now written `#[derive(Debug)]`.
9563 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9564 OsStr}`, provide strings in platform-specific encodings for easier
9565 interop with system APIs. [RFC][osstr-rfc].
9566 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9567 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9568 creating raw pointers.
9572 * Certain long error messages of the form 'expected foo found bar'
9573 are now [split neatly across multiple
9574 lines][multiline]. Examples in the PR.
9575 * On Unix Rust can be [uninstalled][un] by running
9576 `/usr/local/lib/rustlib/uninstall.sh`.
9577 * The `#[rustc_on_unimplemented]` attribute, requiring the
9578 'on_unimplemented' feature, lets rustc [display custom error
9579 messages when a trait is expected to be implemented for a type
9584 * Rust is tested against a [LALR grammar][lalr], which parses
9585 almost all the Rust files that rustc does.
9587 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9588 [close]: https://github.com/rust-lang/rust/pull/21843
9589 [deref]: https://github.com/rust-lang/rust/pull/21351
9590 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9591 [drop]: https://github.com/rust-lang/rust/pull/21972
9592 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9593 [feat]: https://github.com/rust-lang/rust/pull/21248
9594 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9595 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9596 [fmt]: https://github.com/rust-lang/rust/pull/21457
9597 [into]: https://github.com/rust-lang/rust/pull/20790
9598 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9599 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9600 [lalr]: https://github.com/rust-lang/rust/pull/21452
9601 [multiline]: https://github.com/rust-lang/rust/pull/19870
9602 [obj]: https://github.com/rust-lang/rust/pull/22230
9603 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9604 [onun]: https://github.com/rust-lang/rust/pull/20889
9605 [osstr]: https://github.com/rust-lang/rust/pull/21488
9606 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9607 [Self]: https://github.com/rust-lang/rust/pull/22158
9608 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9609 [un]: https://github.com/rust-lang/rust/pull/22256
9612 Version 1.0.0-alpha (2015-01-09)
9613 ==================================
9615 * ~2400 changes, numerous bugfixes
9619 * The language itself is considered feature complete for 1.0,
9620 though there will be many usability improvements and bugfixes
9621 before the final release.
9622 * Nearly 50% of the public API surface of the standard library has
9623 been declared 'stable'. Those interfaces are unlikely to change
9625 * The long-running debate over integer types has been
9626 [settled][ints]: Rust will ship with types named `isize` and
9627 `usize`, rather than `int` and `uint`, for pointer-sized
9628 integers. Guidelines will be rolled out during the alpha cycle.
9629 * Most crates that are not `std` have been moved out of the Rust
9630 distribution into the Cargo ecosystem so they can evolve
9631 separately and don't need to be stabilized as quickly, including
9632 'time', 'getopts', 'num', 'regex', and 'term'.
9633 * Documentation continues to be expanded with more API coverage, more
9634 examples, and more in-depth explanations. The guides have been
9635 consolidated into [The Rust Programming Language][trpl].
9636 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9637 * All official Rust binary installers now come with [Cargo], the
9638 Rust package manager.
9642 * Closures have been [completely redesigned][unboxed] to be
9643 implemented in terms of traits, can now be used as generic type
9644 bounds and thus monomorphized and inlined, or via an opaque
9645 pointer (boxed) as in the old system. The new system is often
9646 referred to as 'unboxed' closures.
9647 * Traits now support [associated types][assoc], allowing families
9648 of related types to be defined together and used generically in
9650 * Enum variants are [namespaced by their type names][enum].
9651 * [`where` clauses][where] provide a more versatile and attractive
9652 syntax for specifying generic bounds, though the previous syntax
9654 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9656 * Rust [no longer has a runtime][rt] of any description, and only
9657 supports OS threads, not green threads.
9658 * At long last, Rust has been overhauled for 'dynamically-sized
9659 types' ([DST]), which integrates 'fat pointers' (object types,
9660 arrays, and `str`) more deeply into the type system, making it
9662 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9663 `..j` that produce range types and which, when combined with the
9664 `Index` operator and multidispatch, leads to a convenient slice
9666 * The new range syntax revealed an ambiguity in the fixed-length
9667 array syntax, so now fixed length arrays [are written `[T;
9669 * The `Copy` trait is no longer implemented automatically. Unsafe
9670 pointers no longer implement `Sync` and `Send` so types
9671 containing them don't automatically either. `Sync` and `Send`
9672 are now 'unsafe traits' so one can "forcibly" implement them via
9673 `unsafe impl` if a type confirms to the requirements for them
9674 even though the internals do not (e.g. structs containing unsafe
9675 pointers like `Arc`). These changes are intended to prevent some
9676 footguns and are collectively known as [opt-in built-in
9677 traits][oibit] (though `Sync` and `Send` will soon become pure
9678 library types unknown to the compiler).
9679 * Operator traits now take their operands [by value][ops], and
9680 comparison traits can use multidispatch to compare one type
9681 against multiple other types, allowing e.g. `String` to be
9682 compared with `&str`.
9683 * `if let` and `while let` are no longer feature-gated.
9684 * Rust has adopted a more [uniform syntax for escaping unicode
9685 characters][unicode].
9686 * `macro_rules!` [has been declared stable][mac]. Though it is a
9687 flawed system it is sufficiently popular that it must be usable
9688 for 1.0. Effort has gone into [future-proofing][mac-future] it
9689 in ways that will allow other macro systems to be developed in
9690 parallel, and won't otherwise impact the evolution of the
9692 * The prelude has been [pared back significantly][prelude] such
9693 that it is the minimum necessary to support the most pervasive
9694 code patterns, and through [generalized where clauses][where]
9695 many of the prelude extension traits have been consolidated.
9696 * Rust's rudimentary reflection [has been removed][refl], as it
9697 incurred too much code generation for little benefit.
9698 * [Struct variants][structvars] are no longer feature-gated.
9699 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9700 known as 'higher-ranked trait bounds', this crucially allows
9701 unboxed closures to work.
9702 * Macros invocations surrounded by parens or square brackets and
9703 not terminated by a semicolon are [parsed as
9704 expressions][macros], which makes expressions like `vec![1i32,
9705 2, 3].len()` work as expected.
9706 * Trait objects now implement their traits automatically, and
9707 traits that can be coerced to objects now must be [object
9709 * Automatically deriving traits is now done with `#[derive(...)]`
9710 not `#[deriving(...)]` for [consistency with other naming
9711 conventions][derive].
9712 * Importing the containing module or enum at the same time as
9713 items or variants they contain is [now done with `self` instead
9714 of `mod`][self], as in use `foo::{self, bar}`
9715 * Glob imports are no longer feature-gated.
9716 * The `box` operator and `box` patterns have been feature-gated
9717 pending a redesign. For now unique boxes should be allocated
9718 like other containers, with `Box::new`.
9722 * A [series][coll1] of [efforts][coll2] to establish
9723 [conventions][coll3] for collections types has resulted in API
9724 improvements throughout the standard library.
9725 * New [APIs for error handling][err] provide ergonomic interop
9726 between error types, and [new conventions][err-conv] describe
9727 more clearly the recommended error handling strategies in Rust.
9728 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9729 it is easier to discuss failure in the context of error handling
9730 without making clarifications as to whether you are referring to
9731 the 'fail' macro or failure more generally.
9732 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9733 syscall when available.
9734 * The 'serialize' crate has been renamed 'rustc-serialize' and
9735 moved out of the distribution to Cargo. Although it is widely
9736 used now, it is expected to be superseded in the near future.
9737 * The `Show` formatter, typically implemented with
9738 `#[derive(Show)]` is [now requested with the `{:?}`
9739 specifier][show] and is intended for use by all types, for uses
9740 such as `println!` debugging. The new `String` formatter must be
9741 implemented by hand, uses the `{}` specifier, and is intended
9742 for full-fidelity conversions of things that can logically be
9743 represented as strings.
9747 * [Flexible target specification][flex] allows rustc's code
9748 generation to be configured to support otherwise-unsupported
9750 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9751 respective debuggers with Rust-appropriate pretty-printing.
9752 * The Windows installation of Rust is distributed with the
9753 MinGW components currently required to link binaries on that
9758 * Nullable enum optimizations have been extended to more types so
9759 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9760 space than the inner types themselves.
9761 * Work has begun on supporting AArch64.
9763 [Cargo]: https://crates.io
9764 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9765 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9766 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9767 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9768 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9769 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9770 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9771 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9772 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9773 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9774 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9775 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9776 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9777 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9778 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9779 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9780 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9781 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9782 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9783 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9784 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9785 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9786 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9787 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9788 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9789 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9790 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9791 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9792 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9793 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9794 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9795 [trpl]: https://doc.rust-lang.org/book/index.html
9796 [rbe]: http://rustbyexample.com/
9799 Version 0.12.0 (2014-10-09)
9800 =============================
9802 * ~1900 changes, numerous bugfixes
9806 * The introductory documentation (now called The Rust Guide) has
9807 been completely rewritten, as have a number of supplementary
9809 * Rust's package manager, Cargo, continues to improve and is
9810 sometimes considered to be quite awesome.
9811 * Many API's in `std` have been reviewed and updated for
9812 consistency with the in-development Rust coding
9813 guidelines. The standard library documentation tracks
9814 stabilization progress.
9815 * Minor libraries have been moved out-of-tree to the rust-lang org
9816 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9817 be installed with Cargo.
9818 * Lifetime elision allows lifetime annotations to be left off of
9819 function declarations in many common scenarios.
9820 * Rust now works on 64-bit Windows.
9823 * Indexing can be overloaded with the `Index` and `IndexMut`
9825 * The `if let` construct takes a branch only if the `let` pattern
9826 matches, currently behind the 'if_let' feature gate.
9827 * 'where clauses', a more flexible syntax for specifying trait
9828 bounds that is more aesthetic, have been added for traits and
9829 free functions. Where clauses will in the future make it
9830 possible to constrain associated types, which would be
9831 impossible with the existing syntax.
9832 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9833 the 'slicing_syntax' feature gate, and can be overloaded with
9834 the `Slice` or `SliceMut` traits.
9835 * The syntax for matching of sub-slices has been changed to use a
9836 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9837 consistency with other uses of `..` and to future-proof
9838 potential additional uses of the syntax.
9839 * The syntax for matching inclusive ranges in patterns has changed
9840 from `0..3` to `0...4` to be consistent with the exclusive range
9842 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9843 c]`) has been put behind the 'advanced_slice_patterns' feature
9844 gate and may be removed in the future.
9845 * Components of tuples and tuple structs can be extracted using
9846 the `value.0` syntax, currently behind the `tuple_indexing`
9848 * The `#[crate_id]` attribute is no longer supported; versioning
9849 is handled by the package manager.
9850 * Renaming crate imports are now written `extern crate foo as bar`
9851 instead of `extern crate bar = foo`.
9852 * Renaming use statements are now written `use foo as bar` instead
9854 * `let` and `match` bindings and argument names in macros are now
9856 * The new, more efficient, closure types ('unboxed closures') have
9857 been added under a feature gate, 'unboxed_closures'. These will
9858 soon replace the existing closure types, once higher-ranked
9859 trait lifetimes are added to the language.
9860 * `move` has been added as a keyword, for indicating closures
9861 that capture by value.
9862 * Mutation and assignment is no longer allowed in pattern guards.
9863 * Generic structs and enums can now have trait bounds.
9864 * The `Share` trait is now called `Sync` to free up the term
9865 'shared' to refer to 'shared reference' (the default reference
9867 * Dynamically-sized types have been mostly implemented,
9868 unifying the behavior of fat-pointer types with the rest of the
9870 * As part of dynamically-sized types, the `Sized` trait has been
9871 introduced, which qualifying types implement by default, and
9872 which type parameters expect by default. To specify that a type
9873 parameter does not need to be sized, write `<Sized? T>`. Most
9874 types are `Sized`, notable exceptions being unsized arrays
9875 (`[T]`) and trait types.
9876 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9877 * Lifetime bounds can now be applied to type parameters and object
9879 * The old, reference counted GC type, `Gc<T>` which was once
9880 denoted by the `@` sigil, has finally been removed. GC will be
9881 revisited in the future.
9884 * Library documentation has been improved for a number of modules.
9885 * Bit-vectors, collections::bitv has been modernized.
9886 * The url crate is deprecated in favor of
9887 http://github.com/servo/rust-url, which can be installed with
9889 * Most I/O stream types can be cloned and subsequently closed from
9891 * A `std::time::Duration` type has been added for use in I/O
9892 methods that rely on timers, as well as in the 'time' crate's
9893 `Timespec` arithmetic.
9894 * The runtime I/O abstraction layer that enabled the green thread
9895 scheduler to do non-thread-blocking I/O has been removed, along
9896 with the libuv-based implementation employed by the green thread
9897 scheduler. This will greatly simplify the future I/O work.
9898 * `collections::btree` has been rewritten to have a more
9899 idiomatic and efficient design.
9902 * rustdoc output now indicates the stability levels of API's.
9903 * The `--crate-name` flag can specify the name of the crate
9904 being compiled, like `#[crate_name]`.
9905 * The `-C metadata` specifies additional metadata to hash into
9906 symbol names, and `-C extra-filename` specifies additional
9907 information to put into the output filename, for use by the
9908 package manager for versioning.
9909 * debug info generation has continued to improve and should be
9910 more reliable under both gdb and lldb.
9911 * rustc has experimental support for compiling in parallel
9912 using the `-C codegen-units` flag.
9913 * rustc no longer encodes rpath information into binaries by
9917 * Stack usage has been optimized with LLVM lifetime annotations.
9918 * Official Rust binaries on Linux are more compatible with older
9919 kernels and distributions, built on CentOS 5.10.
9922 Version 0.11.0 (2014-07-02)
9923 ==========================
9925 * ~1700 changes, numerous bugfixes
9928 * ~[T] has been removed from the language. This type is superseded by
9930 * ~str has been removed from the language. This type is superseded by
9932 * ~T has been removed from the language. This type is superseded by the
9934 * @T has been removed from the language. This type is superseded by the
9935 standard library's std::gc::Gc<T> type.
9936 * Struct fields are now all private by default.
9937 * Vector indices and shift amounts are both required to be a `uint`
9938 instead of any integral type.
9939 * Byte character, byte string, and raw byte string literals are now all
9940 supported by prefixing the normal literal with a `b`.
9941 * Multiple ABIs are no longer allowed in an ABI string
9942 * The syntax for lifetimes on closures/procedures has been tweaked
9943 slightly: `<'a>|A, B|: 'b + K -> T`
9944 * Floating point modulus has been removed from the language; however it
9945 is still provided by a library implementation.
9946 * Private enum variants are now disallowed.
9947 * The `priv` keyword has been removed from the language.
9948 * A closure can no longer be invoked through a &-pointer.
9949 * The `use foo, bar, baz;` syntax has been removed from the language.
9950 * The transmute intrinsic no longer works on type parameters.
9951 * Statics now allow blocks/items in their definition.
9952 * Trait bounds are separated from objects with + instead of : now.
9953 * Objects can no longer be read while they are mutably borrowed.
9954 * The address of a static is now marked as insignificant unless the
9955 #[inline(never)] attribute is placed it.
9956 * The #[unsafe_destructor] attribute is now behind a feature gate.
9957 * Struct literals are no longer allowed in ambiguous positions such as
9958 if, while, match, and for..in.
9959 * Declaration of lang items and intrinsics are now feature-gated by
9961 * Integral literals no longer default to `int`, and floating point
9962 literals no longer default to `f64`. Literals must be suffixed with an
9963 appropriate type if inference cannot determine the type of the
9965 * The Box<T> type is no longer implicitly borrowed to &mut T.
9966 * Procedures are now required to not capture borrowed references.
9969 * The standard library is now a "facade" over a number of underlying
9970 libraries. This means that development on the standard library should
9971 be speedier due to smaller crates, as well as a clearer line between
9973 * A new library, libcore, lives under the standard library's facade
9974 which is Rust's "0-assumption" library, suitable for embedded and
9975 kernel development for example.
9976 * A regex crate has been added to the standard distribution. This crate
9977 includes statically compiled regular expressions.
9978 * The unwrap/unwrap_err methods on Result require a Show bound for
9979 better error messages.
9980 * The return types of the std::comm primitives have been centralized
9981 around the Result type.
9982 * A number of I/O primitives have gained the ability to time out their
9984 * A number of I/O primitives have gained the ability to close their
9985 reading/writing halves to cancel pending operations.
9986 * Reverse iterator methods have been removed in favor of `rev()` on
9987 their forward-iteration counterparts.
9988 * A bitflags! macro has been added to enable easy interop with C and
9989 management of bit flags.
9990 * A debug_assert! macro is now provided which is disabled when
9991 `--cfg ndebug` is passed to the compiler.
9992 * A graphviz crate has been added for creating .dot files.
9993 * The std::cast module has been migrated into std::mem.
9994 * The std::local_data api has been migrated from freestanding functions
9995 to being based on methods.
9996 * The Pod trait has been renamed to Copy.
9997 * jemalloc has been added as the default allocator for types.
9998 * The API for allocating memory has been changed to use proper alignment
9999 and sized deallocation
10000 * Connecting a TcpStream or binding a TcpListener is now based on a
10001 string address and a u16 port. This allows connecting to a hostname as
10003 * The Reader trait now contains a core method, read_at_least(), which
10004 correctly handles many repeated 0-length reads.
10005 * The process-spawning API is now centered around a builder-style
10007 * The :? printing qualifier has been moved from the standard library to
10008 an external libdebug crate.
10009 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10010 have been renamed to Eq/Ord.
10011 * The select/plural methods have been removed from format!. The escapes
10012 for { and } have also changed from \{ and \} to {{ and }},
10014 * The TaskBuilder API has been re-worked to be a true builder, and
10015 extension traits for spawning native/green tasks have been added.
10018 * All breaking changes to the language or libraries now have their
10019 commit message annotated with `[breaking-change]` to allow for easy
10020 discovery of breaking changes.
10021 * The compiler will now try to suggest how to annotate lifetimes if a
10022 lifetime-related error occurs.
10023 * Debug info continues to be improved greatly with general bug fixes and
10024 better support for situations like link time optimization (LTO).
10025 * Usage of syntax extensions when cross-compiling has been fixed.
10026 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10027 -fdata-sections and --gc-sections has been enabled by default
10028 * The compiler is now stricter about where it will load module files
10029 from when a module is declared via `mod foo;`.
10030 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10031 Syntax extensions are now discovered via a "plugin registrar" type
10032 which will be extended in the future to other various plugins.
10033 * Lints have been restructured to allow for dynamically loadable lints.
10034 * A number of rustdoc improvements:
10035 * The HTML output has been visually redesigned.
10036 * Markdown is now powered by hoedown instead of sundown.
10037 * Searching heuristics have been greatly improved.
10038 * The search index has been reduced in size by a great amount.
10039 * Cross-crate documentation via `pub use` has been greatly improved.
10040 * Primitive types are now hyperlinked and documented.
10041 * Documentation has been moved from static.rust-lang.org/doc to
10043 * A new sandbox, play.rust-lang.org, is available for running and
10044 sharing rust code examples on-line.
10045 * Unused attributes are now more robustly warned about.
10046 * The dead_code lint now warns about unused struct fields.
10047 * Cross-compiling to iOS is now supported.
10048 * Cross-compiling to mipsel is now supported.
10049 * Stability attributes are now inherited by default and no longer apply
10050 to intra-crate usage, only inter-crate usage.
10051 * Error message related to non-exhaustive match expressions have been
10055 Version 0.10 (2014-04-03)
10056 =========================
10058 * ~1500 changes, numerous bugfixes
10061 * A new RFC process is now in place for modifying the language.
10062 * Patterns with `@`-pointers have been removed from the language.
10063 * Patterns with unique vectors (`~[T]`) have been removed from the
10065 * Patterns with unique strings (`~str`) have been removed from the
10067 * `@str` has been removed from the language.
10068 * `@[T]` has been removed from the language.
10069 * `@self` has been removed from the language.
10070 * `@Trait` has been removed from the language.
10071 * Headers on `~` allocations which contain `@` boxes inside the type for
10072 reference counting have been removed.
10073 * The semantics around the lifetimes of temporary expressions have changed,
10074 see #3511 and #11585 for more information.
10075 * Cross-crate syntax extensions are now possible, but feature gated. See
10076 #11151 for more information. This includes both `macro_rules!` macros as
10077 well as syntax extensions such as `format!`.
10078 * New lint modes have been added, and older ones have been turned on to be
10080 * Unnecessary parentheses
10081 * Uppercase statics
10083 * Uppercase variables
10084 * Publicly visible private types
10085 * `#[deriving]` with raw pointers
10086 * Unsafe functions can no longer be coerced to closures.
10087 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10088 * The `#[simd]` attribute is now behind a feature gate.
10089 * Visibility is no longer allowed on `extern crate` statements, and
10090 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10091 * Trailing commas are now allowed in argument lists and tuple patterns.
10092 * The `do` keyword has been removed, it is now a reserved keyword.
10093 * Default type parameters have been implemented, but are feature gated.
10094 * Borrowed variables through captures in closures are now considered soundly.
10095 * `extern mod` is now `extern crate`
10096 * The `Freeze` trait has been removed.
10097 * The `Share` trait has been added for types that can be shared among
10099 * Labels in macros are now hygienic.
10100 * Expression/statement macro invocations can be delimited with `{}` now.
10101 * Treatment of types allowed in `static mut` locations has been tweaked.
10102 * The `*` and `.` operators are now overloadable through the `Deref` and
10104 * `~Trait` and `proc` no longer have `Send` bounds by default.
10105 * Partial type hints are now supported with the `_` type marker.
10106 * An `Unsafe` type was introduced for interior mutability. It is now
10107 considered undefined to transmute from `&T` to `&mut T` without using the
10109 * The #[linkage] attribute was implemented for extern statics/functions.
10110 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10111 * `Pod` was renamed to `Copy`.
10114 * The `libextra` library has been removed. It has now been decomposed into
10115 component libraries with smaller and more focused nuggets of
10116 functionality. The full list of libraries can be found on the
10117 documentation index page.
10118 * std: `std::condition` has been removed. All I/O errors are now propagated
10119 through the `Result` type. In order to assist with error handling, a
10120 `try!` macro for unwrapping errors with an early return and a lint for
10121 unused results has been added. See #12039 for more information.
10122 * std: The `vec` module has been renamed to `slice`.
10123 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10124 This will become the only growable vector in the future.
10125 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10126 are now found at `std::io::BufferedReader` instead of
10127 `std::io::buffered::BufferedReader`.
10128 * std: `print` and `println` are no longer in the prelude, the `print!` and
10129 `println!` macros are intended to be used instead.
10130 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10131 attempts to statically prevent cycles.
10132 * std: The standard distribution is adopting the policy of pushing failure
10133 to the user rather than failing in libraries. Many functions (such as
10134 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10135 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10136 deriving mode: `#[deriving(Show)]`.
10137 * std: `ToStr` is now implemented for all types implementing `Show`.
10138 * std: The formatting trait methods now take `&self` instead of `&T`
10139 * std: The `invert()` method on iterators has been renamed to `rev()`
10140 * std: `std::num` has seen a reduction in the genericity of its traits,
10141 consolidating functionality into a few core traits.
10142 * std: Backtraces are now printed on task failure if the environment
10143 variable `RUST_BACKTRACE` is present.
10144 * std: Naming conventions for iterators have been standardized. More details
10145 can be found on the wiki's style guide.
10146 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10147 still implement the function.
10148 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10149 * std: `assert_approx_eq!` has been removed
10150 * std: The `e` and `E` formatting specifiers for floats have been added to
10151 print them in exponential notation.
10152 * std: The `Times` trait has been removed
10153 * std: Indications of variance and opting out of builtin bounds is done
10154 through marker types in `std::kinds::marker` now
10155 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10156 `#[deriving(Hash)]` is now possible.
10157 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10158 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10159 * std: `Chan::new` is now `channel()`.
10160 * std: A new synchronous channel type has been implemented.
10161 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10162 * std: `hashmap` and `trie` have been moved to `libcollections`
10163 * std: `run` has been rolled into `io::process`
10164 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10165 * std: The equality and comparison traits have seen some reorganization.
10166 * std: `rand` has moved to `librand`.
10167 * std: `to_{lower,upper}case` has been implemented for `char`.
10168 * std: Logging has been moved to `liblog`.
10169 * collections: `HashMap` has been rewritten for higher performance and less
10171 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10172 it can be booted manually. The runtime guide has more information and
10174 * native: All I/O functionality except signals has been implemented.
10175 * green: Task spawning with `libgreen` has been optimized with stack caching
10176 and various trimming of code.
10177 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10178 * sync: The `extra::sync` module has been updated to modern rust (and moved
10179 to the `sync` library), tweaking and improving various interfaces while
10180 dropping redundant functionality.
10181 * sync: A new `Barrier` type has been added to the `sync` library.
10182 * sync: An efficient mutex for native and green tasks has been implemented.
10183 * serialize: The `base64` module has seen some improvement. It treats
10184 newlines better, has non-string error values, and has seen general
10186 * fourcc: A `fourcc!` macro was introduced
10187 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10188 hexadecimal literal.
10191 * `rustpkg` has been deprecated and removed from the main repository. Its
10192 replacement, `cargo`, is under development.
10193 * Nightly builds of rust are now available
10194 * The memory usage of rustc has been improved many times throughout this
10196 * The build process supports disabling rpath support for the rustc binary
10198 * Code generation has improved in some cases, giving more information to the
10199 LLVM optimization passes to enable more extensive optimizations.
10200 * Debuginfo compatibility with lldb on OSX has been restored.
10201 * The master branch is now gated on an android bot, making building for
10202 android much more reliable.
10203 * Output flags have been centralized into one `--emit` flag.
10204 * Crate type flags have been centralized into one `--crate-type` flag.
10205 * Codegen flags have been consolidated behind a `-C` flag.
10206 * Linking against outdated crates now has improved error messages.
10207 * Error messages with lifetimes will often suggest how to annotate the
10208 function to fix the error.
10209 * Many more types are documented in the standard library, and new guides
10211 * Many `rustdoc` improvements:
10212 * code blocks are syntax highlighted.
10213 * render standalone markdown files.
10214 * the --test flag tests all code blocks by default.
10215 * exported macros are displayed.
10216 * re-exported types have their documentation inlined at the location of the
10218 * search works across crates that have been rendered to the same output
10222 Version 0.9 (2014-01-09)
10223 ==========================
10225 * ~1800 changes, numerous bugfixes
10228 * The `float` type has been removed. Use `f32` or `f64` instead.
10229 * A new facility for enabling experimental features (feature gating) has
10230 been added, using the crate-level `#[feature(foo)]` attribute.
10231 * Managed boxes (@) are now behind a feature gate
10232 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10233 standard library's `Gc` or `Rc` types instead.
10234 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10235 * Jumping back to the top of a loop is now done with `continue` instead of
10237 * Strings can no longer be mutated through index assignment.
10238 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10239 hash delimiters, as in `r###"foo"###`.
10240 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10242 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10243 * `@fn`s have been removed.
10244 * `do` only works with procs in order to make it obvious what the cost
10246 * Single-element tuple-like structs can no longer be dereferenced to
10247 obtain the inner value. A more comprehensive solution for overloading
10248 the dereference operator will be provided in the future.
10249 * The `#[link(...)]` attribute has been replaced with
10250 `#[crate_id = "name#vers"]`.
10251 * Empty `impl`s must be terminated with empty braces and may not be
10252 terminated with a semicolon.
10253 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10254 no longer has any special meaning.
10255 * The old `fmt!` string formatting macro has been removed.
10256 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10257 `print!` and `println!`.
10258 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10259 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10260 `extern mod foo = "bar"` instead.
10261 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10262 * Macros can have attributes.
10263 * Macros can expand to items with attributes.
10264 * Macros can expand to multiple items.
10265 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10266 * Comments may be nested.
10267 * Values automatically coerce to trait objects they implement, without
10269 * Enum discriminants are no longer an entire word but as small as needed to
10270 contain all the variants. The `repr` attribute can be used to override
10271 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10272 `#[repr(C)]` to match C enums.
10273 * Non-string literals are not allowed in attributes (they never worked).
10274 * The FFI now supports variadic functions.
10275 * Octal numeric literals, as in `0o7777`.
10276 * The `concat!` syntax extension performs compile-time string concatenation.
10277 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10278 removed as Rust no longer uses segmented stacks.
10279 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10280 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10281 not `*`; ignoring remaining fields of a struct is also done with `..`,
10282 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10283 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10284 * `rustc` supports the "system" calling convention, which defaults to the
10285 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10287 * The `type_overflow` lint (default: warn) checks literals for overflow.
10288 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10289 * The `attribute_usage` lint (default: warn) warns about unknown
10291 * The `unknown_features` lint (default: warn) warns about unknown
10293 * The `dead_code` lint (default: warn) checks for dead code.
10294 * Rust libraries can be linked statically to one another
10295 * `#[link_args]` is behind the `link_args` feature gate.
10296 * Native libraries are now linked with `#[link(name = "foo")]`
10297 * Native libraries can be statically linked to a rust crate
10298 (`#[link(name = "foo", kind = "static")]`).
10299 * Native OS X frameworks are now officially supported
10300 (`#[link(name = "foo", kind = "framework")]`).
10301 * The `#[thread_local]` attribute creates thread-local (not task-local)
10302 variables. Currently behind the `thread_local` feature gate.
10303 * The `return` keyword may be used in closures.
10304 * Types that can be copied via a memcpy implement the `Pod` kind.
10305 * The `cfg` attribute can now be used on struct fields and enum variants.
10308 * std: The `option` and `result` API's have been overhauled to make them
10309 simpler, more consistent, and more composable.
10310 * std: The entire `std::io` module has been replaced with one that is
10311 more comprehensive and that properly interfaces with the underlying
10312 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10314 * std: `io::util` contains a number of useful implementations of
10315 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10316 `ZeroReader`, `TeeReader`.
10317 * std: The reference counted pointer type `extra::rc` moved into std.
10318 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10319 just a wrapper around it).
10320 * std: The `Either` type has been removed.
10321 * std: `fmt::Default` can be implemented for any type to provide default
10322 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10323 * std: The `rand` API continues to be tweaked.
10324 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10325 on failure in gdb, is now named `rust_fail`.
10326 * std: The `each_key` and `each_value` methods on `HashMap` have been
10327 replaced by the `keys` and `values` iterators.
10328 * std: Functions dealing with type size and alignment have moved from the
10329 `sys` module to the `mem` module.
10330 * std: The `path` module was written and API changed.
10331 * std: `str::from_utf8` has been changed to cast instead of allocate.
10332 * std: `starts_with` and `ends_with` methods added to vectors via the
10333 `ImmutableEqVector` trait, which is in the prelude.
10334 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10335 if the index is out of bounds.
10336 * std: Task failure no longer propagates between tasks, as the model was
10337 complex, expensive, and incompatible with thread-based tasks.
10338 * std: The `Any` type can be used for dynamic typing.
10339 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10341 * std: Methods that produce iterators generally do not have an `_iter`
10343 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10344 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10345 * std: `util::ignore` renamed to `prelude::drop`.
10346 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10348 * std: `vec::raw` has seen a lot of cleanup and API changes.
10349 * std: The standard library no longer includes any C++ code, and very
10350 minimal C, eliminating the dependency on libstdc++.
10351 * std: Runtime scheduling and I/O functionality has been factored out into
10352 extensible interfaces and is now implemented by two different crates:
10353 libnative, for native threading and I/O; and libgreen, for green threading
10354 and I/O. This paves the way for using the standard library in more limited
10355 embedded environments.
10356 * std: The `comm` module has been rewritten to be much faster, have a
10357 simpler, more consistent API, and to work for both native and green
10359 * std: All libuv dependencies have been moved into the rustuv crate.
10360 * native: New implementations of runtime scheduling on top of OS threads.
10361 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10363 * green: The green thread scheduler and message passing types are almost
10364 entirely lock-free.
10365 * extra: The `flatpipes` module had bitrotted and was removed.
10366 * extra: All crypto functions have been removed and Rust now has a policy of
10367 not reimplementing crypto in the standard library. In the future crypto
10368 will be provided by external crates with bindings to established libraries.
10369 * extra: `c_vec` has been modernized.
10370 * extra: The `sort` module has been removed. Use the `sort` method on
10374 * The `rust` and `rusti` commands have been removed, due to lack of
10376 * `rustdoc` was completely rewritten.
10377 * `rustdoc` can test code examples in documentation.
10378 * `rustpkg` can test packages with the argument, 'test'.
10379 * `rustpkg` supports arbitrary dependencies, including C libraries.
10380 * `rustc`'s support for generating debug info is improved again.
10381 * `rustc` has better error reporting for unbalanced delimiters.
10382 * `rustc`'s JIT support was removed due to bitrot.
10383 * Executables and static libraries can be built with LTO (-Z lto)
10384 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10388 Version 0.8 (2013-09-26)
10389 ============================
10391 * ~2200 changes, numerous bugfixes
10394 * The `for` loop syntax has changed to work with the `Iterator` trait.
10395 * At long last, unwinding works on Windows.
10396 * Default methods are ready for use.
10397 * Many trait inheritance bugs fixed.
10398 * Owned and borrowed trait objects work more reliably.
10399 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10400 * rustc can omit emission of code for the `debug!` macro if it is passed
10402 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10403 for foo.rs, then foo/mod.rs, and will generate an error when both are
10405 * Strings no longer contain trailing nulls. The new `std::c_str` module
10406 provides new mechanisms for converting to C strings.
10407 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10408 * The FFI has been overhauled such that foreign functions are called directly,
10409 instead of through a stack-switching wrapper.
10410 * Calling a foreign function must be done through a Rust function with the
10411 `#[fixed_stack_segment]` attribute.
10412 * The `externfn!` macro can be used to declare both a foreign function and
10413 a `#[fixed_stack_segment]` wrapper at once.
10414 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10415 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10416 * `priv` is disallowed everywhere except for struct fields and enum variants.
10417 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10418 * `ref` bindings in irrefutable patterns work correctly now.
10419 * `char` is now prevented from containing invalid code points.
10420 * Casting to `bool` is no longer allowed.
10421 * `\0` is now accepted as an escape in chars and strings.
10422 * `yield` is a reserved keyword.
10423 * `typeof` is a reserved keyword.
10424 * Crates may be imported by URL with `extern mod foo = "url";`.
10425 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10426 * Static vectors can be initialized with repeating elements,
10427 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10428 * Static structs can be initialized with functional record update,
10429 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10430 * `cfg!` can be used to conditionally execute code based on the crate
10431 configuration, similarly to `#[cfg(...)]`.
10432 * The `unnecessary_qualification` lint detects unneeded module
10433 prefixes (default: allow).
10434 * Arithmetic operations have been implemented on the SIMD types in
10435 `std::unstable::simd`.
10436 * Exchange allocation headers were removed, reducing memory usage.
10437 * `format!` implements a completely new, extensible, and higher-performance
10438 string formatting system. It will replace `fmt!`.
10439 * `print!` and `println!` write formatted strings (using the `format!`
10440 extension) to stdout.
10441 * `write!` and `writeln!` write formatted strings (using the `format!`
10442 extension) to the new Writers in `std::rt::io`.
10443 * The library section in which a function or static is placed may
10444 be specified with `#[link_section = "..."]`.
10445 * The `proto!` syntax extension for defining bounded message protocols
10447 * `macro_rules!` is hygienic for `let` declarations.
10448 * The `#[export_name]` attribute specifies the name of a symbol.
10449 * `unreachable!` can be used to indicate unreachable code, and fails
10453 * std: Transitioned to the new runtime, written in Rust.
10454 * std: Added an experimental I/O library, `rt::io`, based on the new
10456 * std: A new generic `range` function was added to the prelude, replacing
10457 `uint::range` and friends.
10458 * std: `range_rev` no longer exists. Since range is an iterator it can be
10459 reversed with `range(lo, hi).invert()`.
10460 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10461 renamed to `unwrap_or`.
10462 * std: The `iterator` module was renamed to `iter`.
10463 * std: Integral types now support the `checked_add`, `checked_sub`, and
10464 `checked_mul` operations for detecting overflow.
10465 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10467 * std: Methods are standardizing on conventions for casting methods:
10468 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10470 * std: The `CString` type in `c_str` provides new ways to convert to and
10472 * std: `DoubleEndedIterator` can yield elements in two directions.
10473 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10475 * std: `str::from_bytes` renamed to `str::from_utf8`.
10476 * std: `pop_opt` and `shift_opt` methods added to vectors.
10477 * std: The task-local data interface no longer uses @, and keys are
10478 no longer function pointers.
10479 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10480 * std: Added `SharedPort` to `comm`.
10481 * std: `Eq` has a default method for `ne`; only `eq` is required
10482 in implementations.
10483 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10484 is required in implementations.
10485 * std: `is_utf8` performance is improved, impacting many string functions.
10486 * std: `os::MemoryMap` provides cross-platform mmap.
10487 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10488 are not 'in-bounds' are considered undefined.
10489 * std: Many freestanding functions in `vec` removed in favor of methods.
10490 * std: Many freestanding functions on scalar types removed in favor of
10492 * std: Many options to task builders were removed since they don't make
10493 sense in the new scheduler design.
10494 * std: More containers implement `FromIterator` so can be created by the
10496 * std: More complete atomic types in `unstable::atomics`.
10497 * std: `comm::PortSet` removed.
10498 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10499 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10500 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10501 default implementations.
10502 * std: Various `from_str` functions were removed in favor of a generic
10503 `from_str` which is available in the prelude.
10504 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10505 * extra: `dlist`, the doubly-linked list was modernized.
10506 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10507 * extra: Added `glob` module, replacing `std::os::glob`.
10508 * extra: `rope` was removed.
10509 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10510 * extra: `net`, and `timer` were removed. The experimental replacements
10511 are `std::rt::io::net` and `std::rt::io::timer`.
10512 * extra: Iterators implemented for `SmallIntMap`.
10513 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10514 * extra: `SmallIntSet` removed. Use `BitvSet`.
10515 * extra: Performance of JSON parsing greatly improved.
10516 * extra: `semver` updated to SemVer 2.0.0.
10517 * extra: `term` handles more terminals correctly.
10518 * extra: `dbg` module removed.
10519 * extra: `par` module removed.
10520 * extra: `future` was cleaned up, with some method renames.
10521 * extra: Most free functions in `getopts` were converted to methods.
10524 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10525 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10526 similarly to gcc's `--march` flag.
10527 * rustc's performance compiling small crates is much better.
10528 * rustpkg has received many improvements.
10529 * rustpkg supports git tags as package IDs.
10530 * rustpkg builds into target-specific directories so it can be used for
10532 * The number of concurrent test tasks is controlled by the environment
10533 variable RUST_TEST_TASKS.
10534 * The test harness can now report metrics for benchmarks.
10535 * All tools have man pages.
10536 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10537 * The runtime uses jemalloc for allocations.
10538 * Segmented stacks are temporarily disabled as part of the transition to
10539 the new runtime. Stack overflows are possible!
10540 * A new documentation backend, rustdoc_ng, is available for use. It is
10541 still invoked through the normal `rustdoc` command.
10544 Version 0.7 (2013-07-03)
10545 =======================
10547 * ~2000 changes, numerous bugfixes
10550 * `impl`s no longer accept a visibility qualifier. Put them on methods
10552 * The borrow checker has been rewritten with flow-sensitivity, fixing
10553 many bugs and inconveniences.
10554 * The `self` parameter no longer implicitly means `&'self self`,
10555 and can be explicitly marked with a lifetime.
10556 * Overloadable compound operators (`+=`, etc.) have been temporarily
10557 removed due to bugs.
10558 * The `for` loop protocol now requires `for`-iterators to return `bool`
10559 so they compose better.
10560 * The `Durable` trait is replaced with the `'static` bounds.
10561 * Trait default methods work more often.
10562 * Structs with the `#[packed]` attribute have byte alignment and
10563 no padding between fields.
10564 * Type parameters bound by `Copy` must now be copied explicitly with
10565 the `copy` keyword.
10566 * It is now illegal to move out of a dereferenced unsafe pointer.
10567 * `Option<~T>` is now represented as a nullable pointer.
10568 * `@mut` does dynamic borrow checks correctly.
10569 * The `main` function is only detected at the topmost level of the crate.
10570 The `#[main]` attribute is still valid anywhere.
10571 * Struct fields may no longer be mutable. Use inherited mutability.
10572 * The `#[no_send]` attribute makes a type that would otherwise be
10574 * The `#[no_freeze]` attribute makes a type that would otherwise be
10576 * Unbounded recursion will abort the process after reaching the limit
10577 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10578 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10579 are never implicitly copyable.
10580 * `#[static_assert]` makes compile-time assertions about static bools.
10581 * At long last, 'argument modes' no longer exist.
10582 * The rarely used `use mod` statement no longer exists.
10584 * Syntax extensions
10585 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10587 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10588 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10589 `#[deriving(...)]`.
10590 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10591 and unsuffixed integer literals.
10594 * The `core` crate was renamed to `std`.
10595 * The `std` crate was renamed to `extra`.
10596 * More and improved documentation.
10597 * std: `iterator` module for external iterator objects.
10598 * Many old-style (internal, higher-order function) iterators replaced by
10599 implementations of `Iterator`.
10600 * std: Many old internal vector and string iterators,
10601 incl. `any`, `all`. removed.
10602 * std: The `finalize` method of `Drop` renamed to `drop`.
10603 * std: The `drop` method now takes `&mut self` instead of `&self`.
10604 * std: The prelude no longer re-exports any modules, only types and traits.
10605 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10606 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10607 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10608 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10609 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10610 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10611 * std: Many types implement `Clone`.
10612 * std: `path` type renamed to `Path`.
10613 * std: `mut` module and `Mut` type removed.
10614 * std: Many standalone functions removed in favor of methods and iterators
10615 in `vec`, `str`. In the future methods will also work as functions.
10616 * std: `reinterpret_cast` removed. Use `transmute`.
10617 * std: ascii string handling in `std::ascii`.
10618 * std: `Rand` is implemented for ~/@.
10619 * std: `run` module for spawning processes overhauled.
10620 * std: Various atomic types added to `unstable::atomic`.
10621 * std: Various types implement `Zero`.
10622 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10623 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10624 * std: Added `os::mkdir_recursive`.
10625 * std: Added `os::glob` function performs filesystems globs.
10626 * std: `FuzzyEq` renamed to `ApproxEq`.
10627 * std: `Map` now defines `pop` and `swap` methods.
10628 * std: `Cell` constructors converted to static methods.
10629 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10630 * extra: `flate` module moved from `std` to `extra`.
10631 * extra: `fileinput` module for iterating over a series of files.
10632 * extra: `Complex` number type and `complex` module.
10633 * extra: `Rational` number type and `rational` module.
10634 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10635 * extra: `term` uses terminfo now, is more correct.
10636 * extra: `arc` functions converted to methods.
10637 * extra: Implementation of fixed output size variations of SHA-2.
10640 * `unused_variables` lint mode for unused variables (default: warn).
10641 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10643 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10645 * `dead_assignment` lint mode for unread variables (default: warn).
10646 * `unnecessary_allocation` lint mode detects some heap allocations that are
10647 immediately borrowed so could be written without allocating (default: warn).
10648 * `missing_doc` lint mode (default: allow).
10649 * `unreachable_code` lint mode (default: warn).
10650 * The `rusti` command has been rewritten and a number of bugs addressed.
10651 * rustc outputs in color on more terminals.
10652 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10653 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10654 * Compiling with `-g` will make the binary record information about
10655 dynamic borrowcheck failures for debugging.
10656 * rustdoc has a nicer stylesheet.
10657 * Various improvements to rustdoc.
10658 * Improvements to rustpkg (see the detailed release notes).
10661 Version 0.6 (2013-04-03)
10662 ========================
10664 * ~2100 changes, numerous bugfixes
10667 * The self type parameter in traits is now spelled `Self`
10668 * The `self` parameter in trait and impl methods must now be explicitly
10669 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10670 * Static methods no longer require the `static` keyword and instead
10671 are distinguished by the lack of a `self` parameter
10672 * Replaced the `Durable` trait with the `'static` lifetime
10673 * The old closure type syntax with the trailing sigil has been
10674 removed in favor of the more consistent leading sigil
10675 * `super` is a keyword, and may be prefixed to paths
10676 * Trait bounds are separated with `+` instead of whitespace
10677 * Traits are implemented with `impl Trait for Type`
10678 instead of `impl Type: Trait`
10679 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10680 * The `export` keyword has finally been removed
10681 * The `move` keyword has been removed (see "Semantic changes")
10682 * The interior mutability qualifier on vectors, `[mut T]`, has been
10683 removed. Use `&mut [T]`, etc.
10684 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10685 * `fail` is no longer a keyword. Use `fail!()`
10686 * `assert` is no longer a keyword. Use `assert!()`
10687 * `log` is no longer a keyword. use `debug!`, etc.
10688 * 1-tuples may be represented as `(T,)`
10689 * Struct fields may no longer be `mut`. Use inherited mutability,
10690 `@mut T`, `core::mut` or `core::cell`
10691 * `extern mod { ... }` is no longer valid syntax for foreign
10692 function modules. Use extern blocks: `extern { ... }`
10693 * Newtype enums removed. Use tuple-structs.
10694 * Trait implementations no longer support visibility modifiers
10695 * Pattern matching over vectors improved and expanded
10696 * `const` renamed to `static` to correspond to lifetime name,
10697 and make room for future `static mut` unsafe mutable globals.
10698 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10699 * `Clone` implementations can be automatically generated with
10700 `#[deriving(Clone)]`
10701 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10702 instead of `foo as Bar`.
10703 * Fixed length vector types are now written as `[int, .. 3]`
10704 instead of `[int * 3]`.
10705 * Fixed length vector types can express the length as a constant
10706 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10709 * Types with owned pointers or custom destructors move by default,
10710 eliminating the `move` keyword
10711 * All foreign functions are considered unsafe
10712 * &mut is now unaliasable
10713 * Writes to borrowed @mut pointers are prevented dynamically
10715 * The name of the main function can be customized using #[main]
10716 * The default type of an inferred closure is &fn instead of @fn
10717 * `use` statements may no longer be "chained" - they cannot import
10718 identifiers imported by previous `use` statements
10719 * `use` statements are crate relative, importing from the "top"
10720 of the crate by default. Paths may be prefixed with `super::`
10721 or `self::` to change the search behavior.
10722 * Method visibility is inherited from the implementation declaration
10723 * Structural records have been removed
10724 * Many more types can be used in static items, including enums
10725 'static-lifetime pointers and vectors
10726 * Pattern matching over vectors improved and expanded
10727 * Typechecking of closure types has been overhauled to
10728 improve inference and eliminate unsoundness
10729 * Macros leave scope at the end of modules, unless that module is
10730 tagged with #[macro_escape]
10733 * Added big integers to `std::bigint`
10734 * Removed `core::oldcomm` module
10735 * Added pipe-based `core::comm` module
10736 * Numeric traits have been reorganized under `core::num`
10737 * `vec::slice` finally returns a slice
10738 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10739 * Containers reorganized around traits in `core::container`
10740 * `core::dvec` removed, `~[T]` is a drop-in replacement
10741 * `core::send_map` renamed to `core::hashmap`
10742 * `std::map` removed; replaced with `core::hashmap`
10743 * `std::treemap` reimplemented as an owned balanced tree
10744 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10745 * `core::trie` added as a fast ordered map for integer keys
10746 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10747 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10748 overload the comparison operators, whereas `TotalOrd` is used
10749 by certain container types
10752 * Replaced the 'cargo' package manager with 'rustpkg'
10753 * Added all-purpose 'rust' tool
10754 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10755 * rustc now *attempts* to offer spelling suggestions
10756 * Improved support for ARM and Android
10757 * Preliminary MIPS backend
10758 * Improved foreign function ABI implementation for x86, x86_64
10759 * Various memory usage improvements
10760 * Rust code may be embedded in foreign code under limited circumstances
10761 * Inline assembler supported by new asm!() syntax extension.
10764 Version 0.5 (2012-12-21)
10765 ===========================
10767 * ~900 changes, numerous bugfixes
10770 * Removed `<-` move operator
10771 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10772 * Removed old fixed length vector syntax - `[T]/N`
10773 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10774 * Macros may now expand to items and statements
10775 * `a.b()` is always parsed as a method call, never as a field projection
10776 * `Eq` and `IterBytes` implementations can be automatically generated
10777 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10778 * Removed the special crate language for `.rc` files
10779 * Function arguments may consist of any irrefutable pattern
10782 * `&` and `~` pointers may point to objects
10783 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10784 * Enum variants may be structs
10785 * Destructors can be added to all nominal types with the Drop trait
10786 * Structs and nullary enum variants may be constants
10787 * Values that cannot be implicitly copied are now automatically moved
10788 without writing `move` explicitly
10789 * `&T` may now be coerced to `*T`
10790 * Coercions happen in `let` statements as well as function calls
10791 * `use` statements now take crate-relative paths
10792 * The module and type namespaces have been merged so that static
10793 method names can be resolved under the trait in which they are
10796 * Improved support for language features
10797 * Trait inheritance works in many scenarios
10798 * More support for explicit self arguments in methods - `self`, `&self`
10799 `@self`, and `~self` all generally work as expected
10800 * Static methods work in more situations
10801 * Experimental: Traits may declare default methods for the implementations
10805 * New condition handling system in `core::condition`
10806 * Timsort added to `std::sort`
10807 * New priority queue, `std::priority_queue`
10808 * Pipes for serializable types, `std::flatpipes'
10809 * Serialization overhauled to be trait-based
10810 * Expanded `getopts` definitions
10811 * Moved futures to `std`
10812 * More functions are pure now
10813 * `core::comm` renamed to `oldcomm`. Still deprecated
10814 * `rustdoc` and `cargo` are libraries now
10817 * Added a preliminary REPL, `rusti`
10818 * License changed from MIT to dual MIT/APL2
10821 Version 0.4 (2012-10-15)
10822 ==========================
10824 * ~2000 changes, numerous bugfixes
10827 * All keywords are now strict and may not be used as identifiers anywhere
10828 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10829 'of', 'with', 'to', 'class'.
10830 * Classes are replaced with simpler structs
10831 * Explicit method self types
10832 * `ret` became `return` and `alt` became `match`
10833 * `import` is now `use`; `use is now `extern mod`
10834 * `extern mod { ... }` is now `extern { ... }`
10835 * `use mod` is the recommended way to import modules
10836 * `pub` and `priv` replace deprecated export lists
10837 * The syntax of `match` pattern arms now uses fat arrow (=>)
10838 * `main` no longer accepts an args vector; use `os::args` instead
10841 * Trait implementations are now coherent, ala Haskell typeclasses
10842 * Trait methods may be static
10843 * Argument modes are deprecated
10844 * Borrowed pointers are much more mature and recommended for use
10845 * Strings and vectors in the static region are stored in constant memory
10846 * Typestate was removed
10847 * Resolution rewritten to be more reliable
10848 * Support for 'dual-mode' data structures (freezing and thawing)
10851 * Most binary operators can now be overloaded via the traits in
10853 * `std::net::url` for representing URLs
10854 * Sendable hash maps in `core::send_map`
10855 * `core::task' gained a (currently unsafe) task-local storage API
10858 * An efficient new intertask communication primitive called the pipe,
10859 along with a number of higher-level channel types, in `core::pipes`
10860 * `std::arc`, an atomically reference counted, immutable, shared memory
10862 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10863 * Futures are now based on pipes and sendable
10864 * More robust linked task failure
10865 * Improved task builder API
10868 * Improved error reporting
10869 * Preliminary JIT support
10870 * Preliminary work on precise GC
10871 * Extensive architectural improvements to rustc
10872 * Begun a transition away from buggy C++-based reflection (shape) code to
10873 Rust-based (visitor) code
10874 * All hash functions and tables converted to secure, randomized SipHash
10877 Version 0.3 (2012-07-12)
10878 ========================
10880 * ~1900 changes, numerous bugfixes
10882 * New coding conveniences
10883 * Integer-literal suffix inference
10884 * Per-item control over warnings, errors
10885 * #[cfg(windows)] and #[cfg(unix)] attributes
10886 * Documentation comments
10887 * More compact closure syntax
10888 * 'do' expressions for treating higher-order functions as
10890 * *-patterns (wildcard extended to all constructor fields)
10893 * Name resolution pass and exhaustiveness checker rewritten
10894 * Region pointers and borrow checking supersede alias
10896 * Init-ness checking is now provided by a region-based liveness
10897 pass instead of the typestate pass; same for last-use analysis
10898 * Extensive work on region pointers
10900 * Experimental new language features
10901 * Slices and fixed-size, interior-allocated vectors
10902 * #!-comments for lang versioning, shell execution
10903 * Destructors and iface implementation for classes;
10904 type-parameterized classes and class methods
10905 * 'const' type kind for types that can be used to implement
10906 shared-memory concurrency patterns
10910 * Removal of various obsolete features
10911 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10912 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10914 * Constructs: do-while loops ('do' repurposed), fn binding,
10915 resources (replaced by destructors)
10917 * Compiler reorganization
10918 * Syntax-layer of compiler split into separate crate
10919 * Clang (from LLVM project) integrated into build
10920 * Typechecker split into sub-modules
10923 * New time functions
10924 * Extension methods for many built-in types
10925 * Arc: atomic-refcount read-only / exclusive-use shared cells
10926 * Par: parallel map and search routines
10927 * Extensive work on libuv interface
10928 * Much vector code moved to libraries
10929 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10930 #include, #include_str, #include_bin
10932 * Tool improvements
10933 * Cargo automatically resolves dependencies
10936 Version 0.2 (2012-03-29)
10937 =========================
10939 * >1500 changes, numerous bugfixes
10941 * New docs and doc tooling
10943 * New port: FreeBSD x86_64
10945 * Compilation model enhancements
10946 * Generics now specialized, multiply instantiated
10947 * Functions now inlined across separate crates
10949 * Scheduling, stack and threading fixes
10950 * Noticeably improved message-passing performance
10951 * Explicit schedulers
10955 * Experimental new language features
10956 * Operator overloading
10960 * Various language extensions
10961 * C-callback function types: 'crust fn ...'
10962 * Infinite-loop construct: 'loop { ... }'
10963 * Shorten 'mutable' to 'mut'
10964 * Required mutable-local qualifier: 'let mut ...'
10965 * Basic glob-exporting: 'export foo::*;'
10966 * Alt now exhaustive, 'alt check' for runtime-checked
10967 * Block-function form of 'for' loop, with 'break' and 'ret'.
10970 * AST quasi-quote syntax extension
10971 * Revived libuv interface
10972 * New modules: core::{future, iter}, std::arena
10973 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10974 * Extensive cleanup, regularization in libstd, libcore
10977 Version 0.1 (2012-01-20)
10978 ===============================
10980 * Most language features work, including:
10981 * Unique pointers, unique closures, move semantics
10982 * Interface-constrained generics
10983 * Static interface dispatch
10985 * Multithread task scheduling
10986 * Typestate predicates
10987 * Failure unwinding, destructors
10988 * Pattern matching and destructuring assignment
10989 * Lightweight block-lambda syntax
10990 * Preliminary macro-by-example
10992 * Compiler works with the following configurations:
10993 * Linux: x86 and x86_64 hosts and targets
10994 * macOS: x86 and x86_64 hosts and targets
10995 * Windows: x86 hosts and targets
10997 * Cross compilation / multi-target configuration supported.
10999 * Preliminary API-documentation and package-management tools included.
11003 * Documentation is incomplete.
11005 * Performance is below intended target.
11007 * Standard library APIs are subject to extensive change, reorganization.
11009 * Language-level versioning is not yet operational - future code will
11010 break unexpectedly.