1 Version 1.58.1 (2022-01-19)
2 ===========================
4 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
5 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
6 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
7 * [Fix wrong error message displayed when some imports are missing][91254]
8 * [Fix rustfmt not formatting generated files from stdin][92912]
10 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
11 [91254]: https://github.com/rust-lang/rust/pull/91254
12 [92912]: https://github.com/rust-lang/rust/pull/92912
13 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
14 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
16 Version 1.58.0 (2022-01-13)
17 ==========================
22 - [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.
23 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
24 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
29 - [Add LLVM CFI support to the Rust compiler][89652]
30 - [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.
31 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
32 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
33 - [Update the minimum external LLVM to 12][90175]
34 - [Add `x86_64-unknown-none` at Tier 3*][89062]
35 - [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.
36 - [Don't abort compilation after giving a lint error][87337]
37 - [Error messages point at the source of trait bound obligations in more places][89580]
39 \* Refer to Rust's [platform support page][platform-support-doc] for more
40 information on Rust's tiered platform support.
45 - [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.
46 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
47 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
48 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
49 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
50 - [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).
55 - [`Metadata::is_symlink`]
56 - [`Path::is_symlink`]
57 - [`{integer}::saturating_div`]
58 - [`Option::unwrap_unchecked`]
59 - [`Result::unwrap_unchecked`]
60 - [`Result::unwrap_err_unchecked`]
63 These APIs are now usable in const contexts:
66 - [`Duration::checked_add`]
67 - [`Duration::saturating_add`]
68 - [`Duration::checked_sub`]
69 - [`Duration::saturating_sub`]
70 - [`Duration::checked_mul`]
71 - [`Duration::saturating_mul`]
72 - [`Duration::checked_div`]
77 - [Add --message-format for install command][cargo/10107]
78 - [Warn when alias shadows external subcommand][cargo/10082]
83 - [Show all Deref implementations recursively in rustdoc][90183]
84 - [Use computed visibility in rustdoc][88447]
89 - [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.
90 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
91 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
92 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
93 - [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.
94 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
99 These changes provide no direct user facing benefits, but represent significant
100 improvements to the internals and overall performance of rustc
103 - [Implement coherence checks for negative trait impls][90104]
104 - [Add rustc lint, warning when iterating over hashmaps][89558]
105 - [Optimize live point computation][90491]
106 - [Enable verification for 1/32nd of queries loaded from disk][90361]
107 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
109 [87337]: https://github.com/rust-lang/rust/pull/87337/
110 [87467]: https://github.com/rust-lang/rust/pull/87467/
111 [87704]: https://github.com/rust-lang/rust/pull/87704/
112 [88041]: https://github.com/rust-lang/rust/pull/88041/
113 [88447]: https://github.com/rust-lang/rust/pull/88447/
114 [88601]: https://github.com/rust-lang/rust/pull/88601/
115 [89062]: https://github.com/rust-lang/rust/pull/89062/
116 [89174]: https://github.com/rust-lang/rust/pull/89174/
117 [89551]: https://github.com/rust-lang/rust/pull/89551/
118 [89558]: https://github.com/rust-lang/rust/pull/89558/
119 [89580]: https://github.com/rust-lang/rust/pull/89580/
120 [89652]: https://github.com/rust-lang/rust/pull/89652/
121 [90041]: https://github.com/rust-lang/rust/pull/90041/
122 [90058]: https://github.com/rust-lang/rust/pull/90058/
123 [90104]: https://github.com/rust-lang/rust/pull/90104/
124 [90117]: https://github.com/rust-lang/rust/pull/90117/
125 [90175]: https://github.com/rust-lang/rust/pull/90175/
126 [90183]: https://github.com/rust-lang/rust/pull/90183/
127 [90297]: https://github.com/rust-lang/rust/pull/90297/
128 [90329]: https://github.com/rust-lang/rust/pull/90329/
129 [90361]: https://github.com/rust-lang/rust/pull/90361/
130 [90417]: https://github.com/rust-lang/rust/pull/90417/
131 [90473]: https://github.com/rust-lang/rust/pull/90473/
132 [90491]: https://github.com/rust-lang/rust/pull/90491/
133 [90733]: https://github.com/rust-lang/rust/pull/90733/
134 [90833]: https://github.com/rust-lang/rust/pull/90833/
135 [90846]: https://github.com/rust-lang/rust/pull/90846/
136 [91026]: https://github.com/rust-lang/rust/pull/91026/
137 [91207]: https://github.com/rust-lang/rust/pull/91207/
138 [91255]: https://github.com/rust-lang/rust/pull/91255/
139 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
140 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
141 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
142 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
143 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
144 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
145 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
146 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
147 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
148 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
150 Version 1.57.0 (2021-12-02)
151 ==========================
156 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
157 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
158 - [Allow panicking in constant evaluation.][89508]
159 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
164 - [Create more accurate debuginfo for vtables.][89597]
165 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
166 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
167 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
168 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
170 \* Refer to Rust's [platform support page][platform-support-doc] for more
171 information on Rust's tiered platform support.
176 - [Avoid allocations and copying in `Vec::leak`][89337]
177 - [Add `#[repr(i8)]` to `Ordering`][89507]
178 - [Optimize `File::read_to_end` and `read_to_string`][89582]
179 - [Update to Unicode 14.0][89614]
180 - [Many more functions are marked `#[must_use]`][89692], producing a warning
181 when ignoring their return value. This helps catch mistakes such as expecting
182 a function to mutate a value in place rather than return a new value.
187 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
188 - [`[T; N]::as_slice`][`array::as_slice`]
189 - [`collections::TryReserveError`]
190 - [`HashMap::try_reserve`]
191 - [`HashSet::try_reserve`]
192 - [`String::try_reserve`]
193 - [`String::try_reserve_exact`]
194 - [`Vec::try_reserve`]
195 - [`Vec::try_reserve_exact`]
196 - [`VecDeque::try_reserve`]
197 - [`VecDeque::try_reserve_exact`]
198 - [`Iterator::map_while`]
200 - [`proc_macro::is_available`]
201 - [`Command::get_program`]
202 - [`Command::get_args`]
203 - [`Command::get_envs`]
204 - [`Command::get_current_dir`]
208 These APIs are now usable in const contexts:
210 - [`hint::unreachable_unchecked`]
215 - [Stabilize custom profiles][cargo/9943]
220 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
221 This will break some builds that set `#![deny(dead_code)]`.
225 These changes provide no direct user facing benefits, but represent significant
226 improvements to the internals and overall performance of rustc
229 - [Added an experimental backend for codegen with `libgccjit`.][87260]
231 [85200]: https://github.com/rust-lang/rust/pull/85200/
232 [86191]: https://github.com/rust-lang/rust/pull/86191/
233 [87220]: https://github.com/rust-lang/rust/pull/87220/
234 [87260]: https://github.com/rust-lang/rust/pull/87260/
235 [88321]: https://github.com/rust-lang/rust/pull/88321/
236 [88529]: https://github.com/rust-lang/rust/pull/88529/
237 [88690]: https://github.com/rust-lang/rust/pull/88690/
238 [88952]: https://github.com/rust-lang/rust/pull/88952/
239 [89337]: https://github.com/rust-lang/rust/pull/89337/
240 [89507]: https://github.com/rust-lang/rust/pull/89507/
241 [89508]: https://github.com/rust-lang/rust/pull/89508/
242 [89582]: https://github.com/rust-lang/rust/pull/89582/
243 [89597]: https://github.com/rust-lang/rust/pull/89597/
244 [89614]: https://github.com/rust-lang/rust/pull/89614/
245 [89692]: https://github.com/rust-lang/rust/issues/89692/
246 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
247 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
248 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
249 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
250 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
251 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
252 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
253 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
254 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
255 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
256 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
257 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
258 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
259 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
260 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
261 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
262 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
263 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
264 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
265 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
266 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
268 Version 1.56.1 (2021-11-01)
269 ===========================
271 - New lints to detect the presence of bidirectional-override Unicode
272 codepoints in the compiled source code ([CVE-2021-42574])
274 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
276 Version 1.56.0 (2021-10-21)
277 ========================
282 - [The 2021 Edition is now stable.][rust#88100]
283 See [the edition guide][rust-2021-edition-guide] for more details.
284 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
285 - [Union field access is permitted in `const fn`.][rust#85769]
287 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
292 - [Upgrade to LLVM 13.][rust#87570]
293 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
294 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
295 - [Warnings can be forced on with `--force-warn`.][rust#87472]
296 This feature is primarily intended for usage by `cargo fix`, rather than end users.
297 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
298 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
299 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
301 \* Refer to Rust's [platform support page][platform-support-doc] for more
302 information on Rust's tiered platform support.
307 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
308 The Windows console still requires valid Unicode, but this change allows
309 splitting a UTF-8 character across multiple write calls. This allows, for
310 instance, programs that just read and write data buffers (e.g. copying a file
311 to stdout) without regard for Unicode or character boundaries.
312 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
313 For this use case, atomics scale much better under contention.
314 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
315 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
316 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
317 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
318 - [Treat invalid environment variable names as non-existent.][rust#86183]
319 Previously, the environment functions would panic if given a variable name
320 with an internal null character or equal sign (`=`). Now, these functions will
321 just treat such names as non-existent variables, since the OS cannot represent
322 the existence of a variable with such a name.
327 - [`std::os::unix::fs::chroot`]
328 - [`UnsafeCell::raw_get`]
329 - [`BufWriter::into_parts`]
330 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
331 These APIs were previously stable in `std`, but are now also available in `core`.
333 - [`String::shrink_to`]
334 - [`OsString::shrink_to`]
335 - [`PathBuf::shrink_to`]
336 - [`BinaryHeap::shrink_to`]
337 - [`VecDeque::shrink_to`]
338 - [`HashMap::shrink_to`]
339 - [`HashSet::shrink_to`]
341 These APIs are now usable in const contexts:
343 - [`std::mem::transmute`]
344 - [`[T]::first`][`slice::first`]
345 - [`[T]::split_first`][`slice::split_first`]
346 - [`[T]::last`][`slice::last`]
347 - [`[T]::split_last`][`slice::split_last`]
352 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
353 This has no effect at present on dependency version selection.
354 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
355 that support Rust code to include a crate's specified minimum version in the test matrix for that
361 - [Update to new argument parsing rules on Windows.][rust#87580]
362 This adjusts Rust's standard library to match the behavior of the standard
363 libraries for C/C++. The rules have changed slightly over time, and this PR
364 brings us to the latest set of rules (changed in 2008).
365 - [Disallow the aapcs calling convention on aarch64][rust#88399]
366 This was already not supported by LLVM; this change surfaces this lack of
367 support with a better error message.
368 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
369 - [Warn when an escaped newline skips multiple lines.][rust#87671]
370 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
371 may return different values on glibc <= 2.24.][rust#81825]
372 Rust now invokes the `clone3` system call directly, when available, to use new functionality
373 available via that system call. Older versions of glibc cache the result of `getpid`, and only
374 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
375 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
379 These changes provide no direct user facing benefits, but represent significant
380 improvements to the internals and overall performance of rustc
383 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
384 This improves the performance of most Rust builds.
385 - [Unify representation of macros in internal data structures.][rust#88019]
386 This change fixes a host of bugs with the handling of macros by the compiler,
389 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
390 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
391 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
392 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
393 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
394 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
395 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
396 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
397 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
398 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
399 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
400 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
401 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
402 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
403 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
404 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
405 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
406 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
407 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
408 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
409 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
410 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
411 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
412 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
413 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
414 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
415 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
416 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
417 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
418 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
419 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
420 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
421 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
422 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
423 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
424 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
425 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
426 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
427 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
428 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
429 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
430 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
432 Version 1.55.0 (2021-09-09)
433 ============================
437 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
438 will end at the maximum value of the integer.][83918]
439 - [You can now explicitly import the prelude of different editions
440 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
444 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
446 \* Refer to Rust's [platform support page][platform-support-doc] for more
447 information on Rust's tiered platform support.
452 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
453 These improvements should in general provide faster string parsing of floats,
454 no longer reject certain valid floating point values, and reduce
455 the produced code size for non-stripped artifacts.
456 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
463 - [`IntoInnerError::into_error`]
464 - [`IntoInnerError::into_parts`]
465 - [`MaybeUninit::assume_init_mut`]
466 - [`MaybeUninit::assume_init_ref`]
467 - [`MaybeUninit::write`]
469 - [`ops::ControlFlow`]
471 - [`x86::_bittestandcomplement`]
472 - [`x86::_bittestandreset`]
473 - [`x86::_bittestandset`]
474 - [`x86_64::_bittest64`]
475 - [`x86_64::_bittestandcomplement64`]
476 - [`x86_64::_bittestandreset64`]
477 - [`x86_64::_bittestandset64`]
479 The following previously stable functions are now `const`.
481 - [`str::from_utf8_unchecked`]
486 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
487 rustc in parallel such as when using `cargo test`.][cargo/9675]
488 - [The package definition in `cargo metadata` now includes the `"default_run"`
489 field from the manifest.][cargo/9550]
490 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
491 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
492 of packages.][cargo/9663]
496 - [Added "Go to item on exact match" search option.][85876]
497 - [The "Implementors" section on traits no longer shows redundant
498 method definitions.][85970]
499 - [Trait implementations are toggled open by default.][86260] This should make the
500 implementations more searchable by tools like `CTRL+F` in your browser.
501 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
502 through type aliases.][86334]
503 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
504 "Trait Implementations" section.][86513]
509 - [std functions that return an `io::Error` will no longer use the
510 `ErrorKind::Other` variant.][85746] This is to better reflect that these
511 kinds of errors could be categorised [into newer more specific `ErrorKind`
512 variants][79965], and that they do not represent a user error.
513 - [Using environment variable names with `process::Command` on Windows now
514 behaves as expected.][85270] Previously using envionment variables with
515 `Command` would cause them to be ASCII-uppercased.
516 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
517 with `rustdoc::`][86849]
518 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
519 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
520 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
523 [86849]: https://github.com/rust-lang/rust/pull/86849
524 [86513]: https://github.com/rust-lang/rust/pull/86513
525 [86334]: https://github.com/rust-lang/rust/pull/86334
526 [86260]: https://github.com/rust-lang/rust/pull/86260
527 [85970]: https://github.com/rust-lang/rust/pull/85970
528 [85876]: https://github.com/rust-lang/rust/pull/85876
529 [83572]: https://github.com/rust-lang/rust/pull/83572
530 [86294]: https://github.com/rust-lang/rust/pull/86294
531 [86858]: https://github.com/rust-lang/rust/pull/86858
532 [86761]: https://github.com/rust-lang/rust/pull/86761
533 [85746]: https://github.com/rust-lang/rust/pull/85746
534 [85270]: https://github.com/rust-lang/rust/pull/85270
535 [83918]: https://github.com/rust-lang/rust/pull/83918
536 [79965]: https://github.com/rust-lang/rust/pull/79965
537 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
538 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
539 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
540 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
541 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
542 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
543 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
544 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
545 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
546 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
547 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
548 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
549 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
550 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
551 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
552 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
553 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
554 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
555 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
556 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
557 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
558 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
561 Version 1.54.0 (2021-07-29)
562 ============================
565 -----------------------
567 - [You can now use macros for values in some built-in attributes.][83366]
568 This primarily allows you to call macros within the `#[doc]` attribute. For
569 example, to include external documentation in your crate, you can now write
572 #![doc = include_str!("README.md")]
575 - [You can now cast between unsized slice types (and types which contain
576 unsized slices) in `const fn`.][85078]
577 - [You can now use multiple generic lifetimes with `impl Trait` where the
578 lifetimes don't explicitly outlive another.][84701] In code this means
579 that you can now have `impl Trait<'a, 'b>` where as before you could
580 only have `impl Trait<'a, 'b> where 'b: 'a`.
583 -----------------------
585 - [Rustc will now search for custom JSON targets in
586 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
587 directory.][83800] You can find your sysroot directory by running
588 `rustc --print sysroot`.
589 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
590 - [You can now use `#[target_feature]` on safe functions when targeting
591 WebAssembly platforms.][84988]
592 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
593 - [Added tier 3\* support for `bpfel-unknown-none`
594 and `bpfeb-unknown-none`.][79608]
595 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
597 \* Refer to Rust's [platform support page][platform-support-doc] for more
598 information on Rust's tiered platform support.
601 -----------------------
603 - [`panic::panic_any` will now `#[track_caller]`.][85745]
604 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
605 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
606 - [The implementations of vendor intrinsics in core::arch have been
607 significantly refactored.][83278] The main user-visible changes are
608 a 50% reduction in the size of libcore.rlib and stricter validation
609 of constant operands passed to intrinsics. The latter is technically
610 a breaking change, but allows Rust to more closely match the C vendor
616 - [`BTreeMap::into_keys`]
617 - [`BTreeMap::into_values`]
618 - [`HashMap::into_keys`]
619 - [`HashMap::into_values`]
621 - [`VecDeque::binary_search`]
622 - [`VecDeque::binary_search_by`]
623 - [`VecDeque::binary_search_by_key`]
624 - [`VecDeque::partition_point`]
629 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
630 the dependency graph.][cargo/9520]
631 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
632 in the tree ][cargo/9499]
633 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
634 macro dependencies.][cargo/9488]
635 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
636 This variable points to a directory that integration tests and benches
637 can use as a "scratchpad" for testing filesystem operations.
641 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
642 - [Previously unsound code is no longer permitted where different constructors in branches
643 could require different lifetimes.][85574]
644 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
645 than before and may reject some previously accepted code.
646 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
647 when compiled with `codegen-units = 1`.][86063]
649 [85574]: https://github.com/rust-lang/rust/issues/85574
650 [86831]: https://github.com/rust-lang/rust/issues/86831
651 [86063]: https://github.com/rust-lang/rust/issues/86063
652 [79608]: https://github.com/rust-lang/rust/pull/79608
653 [84988]: https://github.com/rust-lang/rust/pull/84988
654 [84701]: https://github.com/rust-lang/rust/pull/84701
655 [84072]: https://github.com/rust-lang/rust/pull/84072
656 [85745]: https://github.com/rust-lang/rust/pull/85745
657 [84744]: https://github.com/rust-lang/rust/pull/84744
658 [85078]: https://github.com/rust-lang/rust/pull/85078
659 [84717]: https://github.com/rust-lang/rust/pull/84717
660 [83800]: https://github.com/rust-lang/rust/pull/83800
661 [83366]: https://github.com/rust-lang/rust/pull/83366
662 [83278]: https://github.com/rust-lang/rust/pull/83278
663 [85292]: https://github.com/rust-lang/rust/pull/85292
664 [82834]: https://github.com/rust-lang/rust/pull/82834
665 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
666 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
667 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
668 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
669 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
670 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
671 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
672 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
673 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
674 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
675 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
677 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
679 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
681 Version 1.53.0 (2021-06-17)
682 ============================
685 -----------------------
686 - [You can now use unicode for identifiers.][83799] This allows multilingual
687 identifiers but still doesn't allow glyphs that are not considered characters
688 such as `◆` or `🦀`. More specifically you can now use any identifier that
689 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
690 is the same standard as languages like Python, however Rust uses NFC
691 normalization which may be different from other languages.
692 - [You can now specify "or patterns" inside pattern matches.][79278]
693 Previously you could only use `|` (OR) on complete patterns. E.g.
697 matches!(x, Some(1) | Some(2));
699 matches!(x, Some(1 | 2));
701 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
702 has the same semantics as the `:pat` matcher. This is to allow `:pat`
703 to change semantics to being a pattern fragment in a future edition.
706 -----------------------
707 - [Updated the minimum external LLVM version to LLVM 10.][83387]
708 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
709 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
711 \* Refer to Rust's [platform support page][platform-support-doc] for more
712 information on Rust's tiered platform support.
715 -----------------------
716 - [Abort messages will now forward to `android_set_abort_message` on
717 Android platforms when available.][81469]
718 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
719 - [Arrays of any length now implement `IntoIterator`.][84147]
720 Currently calling `.into_iter()` as a method on an array will
721 return `impl Iterator<Item=&T>`, but this may change in a
722 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
723 directly on arrays will provide `impl Iterator<Item=T>` as expected.
724 - [`leading_zeros`, and `trailing_zeros` are now available on all
725 `NonZero` integer types.][84082]
726 - [`{f32, f64}::from_str` now parse and print special values
727 (`NaN`, `-0`) according to IEEE 754.][78618]
728 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
729 - [Add the `BITS` associated constant to all numeric types.][82565]
733 - [`AtomicBool::fetch_update`]
734 - [`AtomicPtr::fetch_update`]
735 - [`BTreeMap::retain`]
736 - [`BTreeSet::retain`]
737 - [`BufReader::seek_relative`]
738 - [`DebugStruct::non_exhaustive`]
741 - [`Duration::is_zero`]
742 - [`Duration::saturating_add`]
743 - [`Duration::saturating_mul`]
744 - [`Duration::saturating_sub`]
745 - [`ErrorKind::Unsupported`]
747 - [`Ordering::is_eq`]
748 - [`Ordering::is_ge`]
749 - [`Ordering::is_gt`]
750 - [`Ordering::is_le`]
751 - [`Ordering::is_lt`]
752 - [`Ordering::is_ne`]
753 - [`OsStr::is_ascii`]
754 - [`OsStr::make_ascii_lowercase`]
755 - [`OsStr::make_ascii_uppercase`]
756 - [`OsStr::to_ascii_lowercase`]
757 - [`OsStr::to_ascii_uppercase`]
758 - [`Peekable::peek_mut`]
759 - [`Rc::decrement_strong_count`]
760 - [`Rc::increment_strong_count`]
761 - [`Vec::extend_from_within`]
762 - [`array::from_mut`]
763 - [`array::from_ref`]
764 - [`cmp::max_by_key`]
766 - [`cmp::min_by_key`]
768 - [`f32::is_subnormal`]
769 - [`f64::is_subnormal`]
772 -----------------------
773 - [Cargo now supports git repositories where the default `HEAD` branch is not
774 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
775 which can handle default branches correctly.
776 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
777 - [The `authors` field is no longer included in `Cargo.toml` for new
778 projects.][cargo/9282]
781 -----------------------
782 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
783 without hyperlinks.][81764]
787 - [Implement token-based handling of attributes during expansion][82608]
788 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
789 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
790 to confusion and potential security vulnerabilities and [is no
791 longer recommended][ietf6943].
792 - [The added `BITS` constant may conflict with external definitions.][85667]
793 In particular, this was known to be a problem in the `lexical-core` crate,
794 but they have published fixes for semantic versions 0.4 through 0.7. To
795 update this dependency alone, use `cargo update -p lexical-core`.
796 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
800 These changes provide no direct user facing benefits, but represent significant
801 improvements to the internals and overall performance of rustc and
804 - [Rework the `std::sys::windows::alloc` implementation.][83065]
805 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
806 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
807 - [Rework rustdoc const type][82873]
809 [85667]: https://github.com/rust-lang/rust/pull/85667
810 [83386]: https://github.com/rust-lang/rust/pull/83386
811 [82771]: https://github.com/rust-lang/rust/pull/82771
812 [84147]: https://github.com/rust-lang/rust/pull/84147
813 [84082]: https://github.com/rust-lang/rust/pull/84082
814 [83799]: https://github.com/rust-lang/rust/pull/83799
815 [83681]: https://github.com/rust-lang/rust/pull/83681
816 [83652]: https://github.com/rust-lang/rust/pull/83652
817 [83387]: https://github.com/rust-lang/rust/pull/83387
818 [82873]: https://github.com/rust-lang/rust/pull/82873
819 [82864]: https://github.com/rust-lang/rust/pull/82864
820 [82608]: https://github.com/rust-lang/rust/pull/82608
821 [82565]: https://github.com/rust-lang/rust/pull/82565
822 [80525]: https://github.com/rust-lang/rust/pull/80525
823 [79278]: https://github.com/rust-lang/rust/pull/79278
824 [78618]: https://github.com/rust-lang/rust/pull/78618
825 [77704]: https://github.com/rust-lang/rust/pull/77704
826 [83941]: https://github.com/rust-lang/rust/pull/83941
827 [83065]: https://github.com/rust-lang/rust/pull/83065
828 [81764]: https://github.com/rust-lang/rust/pull/81764
829 [81469]: https://github.com/rust-lang/rust/pull/81469
830 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
831 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
832 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
833 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
834 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
835 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
836 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
837 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
838 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
839 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
840 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
841 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
842 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
843 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
844 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
845 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
846 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
847 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
848 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
849 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
850 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
851 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
852 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
853 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
854 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
855 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
856 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
857 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
858 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
859 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
860 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
861 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
862 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
863 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
864 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
865 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
866 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
867 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
868 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
869 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
870 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
873 Version 1.52.1 (2021-05-10)
874 ============================
876 This release disables incremental compilation, unless the user has explicitly
877 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
879 This is due to the widespread, and frequently occuring, breakage encountered by
880 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
881 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
882 newly added incremental verification are still present in past stable versions,
883 and are not yet fixed on any channel. These bugs can lead to miscompilation of
886 These problems only affect incremental builds, so release builds with Cargo
887 should not be affected unless the user has explicitly opted into incremental.
888 Debug and check builds are affected.
890 See [84970] for more details.
892 [84970]: https://github.com/rust-lang/rust/issues/84970
894 Version 1.52.0 (2021-05-06)
895 ============================
899 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
900 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
901 is allowed by default, and may become a warning or hard error in a
903 - [You can now cast mutable references to arrays to a pointer of the same type as
908 - [Upgraded the default LLVM to LLVM 12.][81451]
910 Added tier 3\* support for the following targets.
912 - [`s390x-unknown-linux-musl`][82166]
913 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
914 - [`powerpc-unknown-openbsd`][82733]
916 \* Refer to Rust's [platform support page][platform-support-doc] for more
917 information on Rust's tiered platform support.
921 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
922 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
923 - [`Arc<impl Error>` now implements `error::Error`.][80553]
924 - [All integer division and remainder operations are now `const`.][80962]
928 - [`Arguments::as_str`]
930 - [`char::REPLACEMENT_CHARACTER`]
931 - [`char::UNICODE_VERSION`]
932 - [`char::decode_utf16`]
933 - [`char::from_digit`]
934 - [`char::from_u32_unchecked`]
936 - [`slice::partition_point`]
937 - [`str::rsplit_once`]
938 - [`str::split_once`]
940 The following previously stable APIs are now `const`.
943 - [`char::len_utf16`]
944 - [`char::to_ascii_uppercase`]
945 - [`char::to_ascii_lowercase`]
946 - [`char::eq_ignore_ascii_case`]
947 - [`u8::to_ascii_uppercase`]
948 - [`u8::to_ascii_lowercase`]
949 - [`u8::eq_ignore_ascii_case`]
953 - [Rustdoc lints are now treated as a tool lint, meaning that
954 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
955 Using the old style is still allowed, and will become a warning in
957 - [Rustdoc now supports argument files.][82261]
958 - [Rustdoc now generates smart punctuation for documentation.][79423]
959 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
967 - [You can now pass multiple filters to tests.][81356] E.g.
968 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
969 - [Rustup now distributes PDB symbols for the `std` library on Windows,
970 allowing you to see `std` symbols when debugging.][82218]
974 These changes provide no direct user facing benefits, but represent significant
975 improvements to the internals and overall performance of rustc and
978 - [Check the result cache before the DepGraph when ensuring queries][81855]
979 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
980 - [Only store a LocalDefId in some HIR nodes][81611]
981 - [Store HIR attributes in a side table][79519]
985 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
986 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
987 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
988 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
989 languages in code blocks.][78429]
990 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
991 - [Changes in how proc macros handle whitespace may lead to panics when used
992 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
993 - [Turn `#[derive]` into a regular macro attribute][79078]
995 [84136]: https://github.com/rust-lang/rust/issues/84136
996 [80763]: https://github.com/rust-lang/rust/pull/80763
997 [82166]: https://github.com/rust-lang/rust/pull/82166
998 [82121]: https://github.com/rust-lang/rust/pull/82121
999 [81879]: https://github.com/rust-lang/rust/pull/81879
1000 [82261]: https://github.com/rust-lang/rust/pull/82261
1001 [82218]: https://github.com/rust-lang/rust/pull/82218
1002 [82216]: https://github.com/rust-lang/rust/pull/82216
1003 [82202]: https://github.com/rust-lang/rust/pull/82202
1004 [81855]: https://github.com/rust-lang/rust/pull/81855
1005 [81766]: https://github.com/rust-lang/rust/pull/81766
1006 [81744]: https://github.com/rust-lang/rust/pull/81744
1007 [81611]: https://github.com/rust-lang/rust/pull/81611
1008 [81479]: https://github.com/rust-lang/rust/pull/81479
1009 [81451]: https://github.com/rust-lang/rust/pull/81451
1010 [81356]: https://github.com/rust-lang/rust/pull/81356
1011 [80962]: https://github.com/rust-lang/rust/pull/80962
1012 [80553]: https://github.com/rust-lang/rust/pull/80553
1013 [80527]: https://github.com/rust-lang/rust/pull/80527
1014 [79519]: https://github.com/rust-lang/rust/pull/79519
1015 [79423]: https://github.com/rust-lang/rust/pull/79423
1016 [79208]: https://github.com/rust-lang/rust/pull/79208
1017 [78429]: https://github.com/rust-lang/rust/pull/78429
1018 [82733]: https://github.com/rust-lang/rust/pull/82733
1019 [82594]: https://github.com/rust-lang/rust/pull/82594
1020 [79078]: https://github.com/rust-lang/rust/pull/79078
1021 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1022 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1023 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1024 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1025 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1026 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1027 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1028 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1029 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1030 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1031 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1032 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1033 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1034 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1035 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1036 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1037 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1038 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1039 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1040 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1041 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1042 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1044 Version 1.51.0 (2021-03-25)
1045 ============================
1049 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1050 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1051 E.g. you can now write the following. Note: Only values of primitive integers,
1052 `bool`, or `char` types are currently permitted.
1054 struct GenericArray<T, const LENGTH: usize> {
1058 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1059 const fn last(&self) -> Option<&T> {
1063 Some(&self.inner[LENGTH - 1])
1073 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1074 This option controls whether debug information is split across multiple files
1075 or packed into a single file. **Note** This option is unstable on other platforms.
1076 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1077 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1078 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1079 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1081 \* Refer to Rust's [platform support page][platform-support-doc] for more
1082 information on Rust's tiered platform support.
1087 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1088 - [`str` now implements `AsMut<str>`.][80279]
1089 - [`u64` and `u128` now implement `From<char>`.][79502]
1090 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1091 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1092 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1093 - [`io::Empty` now implements `io::Seek`.][78044]
1094 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1095 `T: ?Sized` types.][80764]
1096 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1102 - [`Arc::decrement_strong_count`]
1103 - [`Arc::increment_strong_count`]
1104 - [`Once::call_once_force`]
1105 - [`Peekable::next_if_eq`]
1106 - [`Peekable::next_if`]
1107 - [`Seek::stream_position`]
1108 - [`array::IntoIter`]
1109 - [`panic::panic_any`]
1111 - [`ptr::addr_of_mut!`]
1112 - [`slice::fill_with`]
1113 - [`slice::split_inclusive_mut`]
1114 - [`slice::split_inclusive`]
1115 - [`slice::strip_prefix`]
1116 - [`slice::strip_suffix`]
1117 - [`str::split_inclusive`]
1118 - [`sync::OnceState`]
1120 - [`VecDeque::range`]
1121 - [`VecDeque::range_mut`]
1125 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1126 codegen option.][cargo/9112]
1127 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1128 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1129 to avoid unifying features of dependencies where that unification could be unwanted.
1130 Such as using the same dependency with a `std` feature in a build scripts and
1131 proc-macros, while using the `no-std` feature in the final binary. See the
1132 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1137 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1138 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1139 documentation.][79642]
1141 Various improvements to intra-doc links:
1143 - [You can link to non-path primitives such as `slice`.][80181]
1144 - [You can link to associated items.][74489]
1145 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1149 - [You can now pass `--include-ignored` to tests (e.g. with
1150 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1155 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1156 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1158 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1159 for the distributed artifacts.][81521]
1160 - `armv5te-unknown-linux-gnueabi`
1161 - `sparc64-unknown-linux-gnu`
1162 - `thumbv7neon-unknown-linux-gnueabihf`
1163 - `armv7-unknown-linux-gnueabi`
1164 - `x86_64-unknown-linux-gnux32`
1165 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1170 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1172 [79135]: https://github.com/rust-lang/rust/pull/79135
1173 [74489]: https://github.com/rust-lang/rust/pull/74489
1174 [76934]: https://github.com/rust-lang/rust/pull/76934
1175 [79570]: https://github.com/rust-lang/rust/pull/79570
1176 [80181]: https://github.com/rust-lang/rust/pull/80181
1177 [79642]: https://github.com/rust-lang/rust/pull/79642
1178 [80945]: https://github.com/rust-lang/rust/pull/80945
1179 [80279]: https://github.com/rust-lang/rust/pull/80279
1180 [80053]: https://github.com/rust-lang/rust/pull/80053
1181 [79502]: https://github.com/rust-lang/rust/pull/79502
1182 [75180]: https://github.com/rust-lang/rust/pull/75180
1183 [81521]: https://github.com/rust-lang/rust/pull/81521
1184 [80968]: https://github.com/rust-lang/rust/pull/80968
1185 [80959]: https://github.com/rust-lang/rust/pull/80959
1186 [80718]: https://github.com/rust-lang/rust/pull/80718
1187 [80653]: https://github.com/rust-lang/rust/pull/80653
1188 [80579]: https://github.com/rust-lang/rust/pull/80579
1189 [79998]: https://github.com/rust-lang/rust/pull/79998
1190 [78044]: https://github.com/rust-lang/rust/pull/78044
1191 [81455]: https://github.com/rust-lang/rust/pull/81455
1192 [80764]: https://github.com/rust-lang/rust/pull/80764
1193 [80749]: https://github.com/rust-lang/rust/pull/80749
1194 [80662]: https://github.com/rust-lang/rust/pull/80662
1195 [79134]: https://github.com/rust-lang/rust/pull/79134
1196 [80966]: https://github.com/rust-lang/rust/pull/80966
1197 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1198 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1199 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1200 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1201 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1202 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1203 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1204 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1205 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1206 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1207 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1208 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1209 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1210 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1211 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1212 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1213 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1214 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1215 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1216 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1217 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1218 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1219 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1221 Version 1.50.0 (2021-02-11)
1222 ============================
1225 -----------------------
1226 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1227 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1228 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1231 -----------------------
1232 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1233 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1234 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1235 - [Dropped support for all cloudabi targets.][78439]
1237 \* Refer to Rust's [platform support page][platform-support-doc] for more
1238 information on Rust's tiered platform support.
1241 -----------------------
1243 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1244 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1245 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1246 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1247 up the same amount of space as `File`.
1253 - [`btree_map::Entry::or_insert_with_key`]
1256 - [`hash_map::Entry::or_insert_with_key`]
1260 - [`UnsafeCell::get_mut`]
1262 The following previously stable methods are now `const`.
1264 - [`IpAddr::is_ipv4`]
1265 - [`IpAddr::is_ipv6`]
1266 - [`IpAddr::is_unspecified`]
1267 - [`IpAddr::is_loopback`]
1268 - [`IpAddr::is_multicast`]
1269 - [`Ipv4Addr::octets`]
1270 - [`Ipv4Addr::is_loopback`]
1271 - [`Ipv4Addr::is_private`]
1272 - [`Ipv4Addr::is_link_local`]
1273 - [`Ipv4Addr::is_multicast`]
1274 - [`Ipv4Addr::is_broadcast`]
1275 - [`Ipv4Addr::is_documentation`]
1276 - [`Ipv4Addr::to_ipv6_compatible`]
1277 - [`Ipv4Addr::to_ipv6_mapped`]
1278 - [`Ipv6Addr::segments`]
1279 - [`Ipv6Addr::is_unspecified`]
1280 - [`Ipv6Addr::is_loopback`]
1281 - [`Ipv6Addr::is_multicast`]
1282 - [`Ipv6Addr::to_ipv4`]
1285 - [`Layout::from_size_align`]
1286 - `pow` for all integer types.
1287 - `checked_pow` for all integer types.
1288 - `saturating_pow` for all integer types.
1289 - `wrapping_pow` for all integer types.
1290 - `next_power_of_two` for all unsigned integer types.
1291 - `checked_next_power_of_two` for all unsigned integer types.
1294 -----------------------
1296 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1297 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1298 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1299 contents of that directory for changes.][cargo/8973]
1300 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1305 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1306 - [Running tests will now print the total time taken to execute.][75752]
1311 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1312 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1313 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1314 unhygenic `macro_rules!` macros.][79472]
1315 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1316 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1317 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1318 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1319 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1320 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1322 [74989]: https://github.com/rust-lang/rust/pull/74989
1323 [79261]: https://github.com/rust-lang/rust/pull/79261
1324 [79896]: https://github.com/rust-lang/rust/pull/79896
1325 [79484]: https://github.com/rust-lang/rust/pull/79484
1326 [79472]: https://github.com/rust-lang/rust/pull/79472
1327 [79270]: https://github.com/rust-lang/rust/pull/79270
1328 [79003]: https://github.com/rust-lang/rust/pull/79003
1329 [78864]: https://github.com/rust-lang/rust/pull/78864
1330 [78636]: https://github.com/rust-lang/rust/pull/78636
1331 [78439]: https://github.com/rust-lang/rust/pull/78439
1332 [78343]: https://github.com/rust-lang/rust/pull/78343
1333 [78296]: https://github.com/rust-lang/rust/pull/78296
1334 [78068]: https://github.com/rust-lang/rust/pull/78068
1335 [75752]: https://github.com/rust-lang/rust/pull/75752
1336 [74699]: https://github.com/rust-lang/rust/pull/74699
1337 [78142]: https://github.com/rust-lang/rust/pull/78142
1338 [77484]: https://github.com/rust-lang/rust/pull/77484
1339 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1340 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1341 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1342 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1343 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1344 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1345 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1346 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1347 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1348 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1349 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1350 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1351 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1352 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1353 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1354 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1355 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1356 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1357 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1358 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1359 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1360 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1361 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1362 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1363 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1364 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1365 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1366 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1367 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1368 [`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
1369 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1370 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1371 [`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
1372 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1375 Version 1.49.0 (2020-12-31)
1376 ============================
1379 -----------------------
1381 - [Unions can now implement `Drop`, and you can now have a field in a union
1382 with `ManuallyDrop<T>`.][77547]
1383 - [You can now cast uninhabited enums to integers.][76199]
1384 - [You can now bind by reference and by move in patterns.][76119] This
1385 allows you to selectively borrow individual components of a type. E.g.
1393 let person = Person {
1394 name: String::from("Alice"),
1398 // `name` is moved out of person, but `age` is referenced.
1399 let Person { name, ref age } = person;
1400 println!("{} {}", name, age);
1404 -----------------------
1406 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1407 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1408 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1409 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1410 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1411 - [Output from threads spawned in tests is now captured.][78227]
1412 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1414 \* Refer to Rust's [platform support page][platform-support-doc] for more
1415 information on Rust's tiered platform support.
1418 -----------------------
1420 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1421 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1426 - [`slice::select_nth_unstable`]
1427 - [`slice::select_nth_unstable_by`]
1428 - [`slice::select_nth_unstable_by_key`]
1430 The following previously stable methods are now `const`.
1432 - [`Poll::is_ready`]
1433 - [`Poll::is_pending`]
1436 -----------------------
1437 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1438 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1439 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1440 variable will be set if the crate being built is one the user selected to build, either
1441 with `-p` or through defaults.
1442 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1448 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1449 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1450 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1451 Previously such invalid or unused attributes could be ignored.
1452 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1453 read [this post about the changes][rustdoc-ws-post] for more details.
1454 - [Trait bounds are no longer inferred for associated types.][79904]
1458 These changes provide no direct user facing benefits, but represent significant
1459 improvements to the internals and overall performance of rustc and
1462 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1463 Local Storage model.][78201]
1464 - [Calculate visibilities once in resolve.][78077]
1465 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1466 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1469 [75991]: https://github.com/rust-lang/rust/pull/75991
1470 [78951]: https://github.com/rust-lang/rust/pull/78951
1471 [78848]: https://github.com/rust-lang/rust/pull/78848
1472 [78746]: https://github.com/rust-lang/rust/pull/78746
1473 [78376]: https://github.com/rust-lang/rust/pull/78376
1474 [78228]: https://github.com/rust-lang/rust/pull/78228
1475 [78227]: https://github.com/rust-lang/rust/pull/78227
1476 [78201]: https://github.com/rust-lang/rust/pull/78201
1477 [78109]: https://github.com/rust-lang/rust/pull/78109
1478 [78077]: https://github.com/rust-lang/rust/pull/78077
1479 [77997]: https://github.com/rust-lang/rust/pull/77997
1480 [77703]: https://github.com/rust-lang/rust/pull/77703
1481 [77547]: https://github.com/rust-lang/rust/pull/77547
1482 [77015]: https://github.com/rust-lang/rust/pull/77015
1483 [76199]: https://github.com/rust-lang/rust/pull/76199
1484 [76119]: https://github.com/rust-lang/rust/pull/76119
1485 [75914]: https://github.com/rust-lang/rust/pull/75914
1486 [79004]: https://github.com/rust-lang/rust/pull/79004
1487 [78676]: https://github.com/rust-lang/rust/pull/78676
1488 [79904]: https://github.com/rust-lang/rust/issues/79904
1489 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1490 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1491 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1492 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1493 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1494 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1495 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1496 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1497 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1498 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1500 Version 1.48.0 (2020-11-19)
1501 ==========================
1506 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1507 is still rejected *semantically*, but can now be parsed by procedural macros.
1511 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1512 `rustc` whether to link its own C runtime and libraries or to rely on a external
1513 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1514 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1515 Note: If you're using cargo you must explicitly pass the `--target` flag.
1516 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1518 \* Refer to Rust's [platform support page][platform-support-doc] for more
1519 information on Rust's tiered platform support.
1523 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1524 and `&Stderr`.][76275]
1525 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1526 - [The `matches!` macro now supports having a trailing comma.][74880]
1527 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1528 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1532 - [`slice::as_ptr_range`]
1533 - [`slice::as_mut_ptr_range`]
1534 - [`VecDeque::make_contiguous`]
1535 - [`future::pending`]
1538 The following previously stable methods are now `const fn`'s:
1540 - [`Option::is_some`]
1541 - [`Option::is_none`]
1542 - [`Option::as_ref`]
1544 - [`Result::is_err`]
1545 - [`Result::as_ref`]
1546 - [`Ordering::reverse`]
1547 - [`Ordering::then`]
1554 - [You can now link to items in `rustdoc` using the intra-doc link
1555 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1556 a link to `std::future`'s documentation. See ["Linking to items by
1557 name"][intradoc-links] for more information.
1558 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1559 when searching through `rustdoc`'s UI.][75740]
1563 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1564 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1565 promoted to `'static` lifetime any more inside `const fn`s.
1566 - [Associated type bindings on trait objects are now verified to meet the bounds
1567 declared on the trait when checking that they implement the trait.][27675]
1568 - [When trait bounds on associated types or opaque types are ambiguous, the
1569 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1570 - [Fixed recursive nonterminals not being expanded in macros during
1571 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1572 correctly handling recursive nonterminal tokens.
1573 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1574 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1575 in places where they have no effect.][73461]
1576 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1577 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1578 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1579 disallow zero-initialization.][71274]
1580 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1581 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1582 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1583 see the [`catch_unwind`] documentation for further information.
1589 These changes provide no direct user facing benefits, but represent significant
1590 improvements to the internals and overall performance of rustc and
1593 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1594 You can continue building with `make` by setting `ninja=false` in
1596 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1597 - [Made `ensure_sufficient_stack()` non-generic][76680]
1599 [78143]: https://github.com/rust-lang/rust/issues/78143
1600 [76680]: https://github.com/rust-lang/rust/pull/76680/
1601 [76030]: https://github.com/rust-lang/rust/pull/76030/
1602 [70212]: https://github.com/rust-lang/rust/pull/70212/
1603 [27675]: https://github.com/rust-lang/rust/issues/27675/
1604 [54121]: https://github.com/rust-lang/rust/issues/54121/
1605 [71274]: https://github.com/rust-lang/rust/pull/71274/
1606 [77386]: https://github.com/rust-lang/rust/pull/77386/
1607 [77153]: https://github.com/rust-lang/rust/pull/77153/
1608 [77055]: https://github.com/rust-lang/rust/pull/77055/
1609 [76275]: https://github.com/rust-lang/rust/pull/76275/
1610 [76310]: https://github.com/rust-lang/rust/pull/76310/
1611 [76420]: https://github.com/rust-lang/rust/pull/76420/
1612 [76158]: https://github.com/rust-lang/rust/pull/76158/
1613 [75857]: https://github.com/rust-lang/rust/pull/75857/
1614 [75585]: https://github.com/rust-lang/rust/pull/75585/
1615 [75740]: https://github.com/rust-lang/rust/pull/75740/
1616 [75502]: https://github.com/rust-lang/rust/pull/75502/
1617 [74880]: https://github.com/rust-lang/rust/pull/74880/
1618 [74922]: https://github.com/rust-lang/rust/pull/74922/
1619 [74430]: https://github.com/rust-lang/rust/pull/74430/
1620 [74194]: https://github.com/rust-lang/rust/pull/74194/
1621 [73461]: https://github.com/rust-lang/rust/pull/73461/
1622 [73166]: https://github.com/rust-lang/rust/pull/73166/
1623 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1624 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1625 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1626 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1627 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1628 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1629 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1630 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1631 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1632 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1633 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1634 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1635 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1636 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1637 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1640 Version 1.47.0 (2020-10-08)
1641 ==========================
1645 - [Closures will now warn when not used.][74869]
1649 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1650 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1652 - [Upgraded to LLVM 11.][73526]
1653 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1654 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1655 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1657 \* Refer to Rust's [platform support page][platform-support-doc] for more
1658 information on Rust's tiered platform support.
1662 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1663 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1664 those of length less than 33.][74060]
1665 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1666 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1667 `PartialEq`, and `PartialOrd`.][73583]
1671 - [`Ident::new_raw`]
1672 - [`Range::is_empty`]
1673 - [`RangeInclusive::is_empty`]
1674 - [`Result::as_deref`]
1675 - [`Result::as_deref_mut`]
1677 - [`pointer::offset_from`]
1681 The following previously stable APIs have now been made const.
1683 - [The `new` method for all `NonZero` integers.][73858]
1684 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1685 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1686 methods for all integers.][73858]
1687 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1688 signed integers.][73858]
1689 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1690 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1691 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1692 `is_ascii_control` methods for `char` and `u8`.][73858]
1696 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1697 You can override this by setting the following in your `Cargo.toml`.
1699 [profile.release.build-override]
1702 - [`cargo-help` will now display man pages for commands rather just the
1703 `--help` text.][cargo/8456]
1704 - [`cargo-metadata` now emits a `test` field indicating if a target has
1705 tests enabled.][cargo/8478]
1706 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1707 - [`cargo-publish` will now use an alternative registry by default if it's the
1708 only registry specified in `package.publish`.][cargo/8571]
1712 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1713 type based search.][75366]
1714 - [Added the Ayu theme to rustdoc.][71237]
1718 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1719 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1720 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1721 help to preserve more span information.][73084] These changes may cause
1722 compiliation errors if your macro was unhygenic or didn't correctly handle
1724 - [Moved support for the CloudABI target to tier 3.][75568]
1725 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1726 - [Added the `rustc-docs` component.][75560] This allows you to install
1727 and read the documentation for the compiler internal APIs. (Currently only
1728 available for `x86_64-unknown-linux-gnu`.)
1733 - [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.
1735 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1736 [75048]: https://github.com/rust-lang/rust/pull/75048/
1737 [74163]: https://github.com/rust-lang/rust/pull/74163/
1738 [71237]: https://github.com/rust-lang/rust/pull/71237/
1739 [74869]: https://github.com/rust-lang/rust/pull/74869/
1740 [73858]: https://github.com/rust-lang/rust/pull/73858/
1741 [75716]: https://github.com/rust-lang/rust/pull/75716/
1742 [75560]: https://github.com/rust-lang/rust/pull/75560/
1743 [75568]: https://github.com/rust-lang/rust/pull/75568/
1744 [75366]: https://github.com/rust-lang/rust/pull/75366/
1745 [75204]: https://github.com/rust-lang/rust/pull/75204/
1746 [74650]: https://github.com/rust-lang/rust/pull/74650/
1747 [74419]: https://github.com/rust-lang/rust/pull/74419/
1748 [73964]: https://github.com/rust-lang/rust/pull/73964/
1749 [74021]: https://github.com/rust-lang/rust/pull/74021/
1750 [74060]: https://github.com/rust-lang/rust/pull/74060/
1751 [73893]: https://github.com/rust-lang/rust/pull/73893/
1752 [73526]: https://github.com/rust-lang/rust/pull/73526/
1753 [73583]: https://github.com/rust-lang/rust/pull/73583/
1754 [73084]: https://github.com/rust-lang/rust/pull/73084/
1755 [73197]: https://github.com/rust-lang/rust/pull/73197/
1756 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1757 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1758 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1759 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1760 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1761 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1762 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1763 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1764 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1765 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1766 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1767 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1768 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1769 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1772 Version 1.46.0 (2020-08-27)
1773 ==========================
1777 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1778 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1779 const functions.][73862]
1780 - [The `#[track_caller]` attribute can now be added to functions to use the
1781 function's caller's location information for panic messages.][72445]
1782 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1783 `x.0.0` over `(x.0).0`.
1784 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1785 You currently can't use `mem::transmute` in constant functions.
1789 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1790 - [Enabled static "Position Independent Executables" by default
1791 for `x86_64-unknown-linux-musl`.][70740]
1795 - [`mem::forget` is now a `const fn`.][73887]
1796 - [`String` now implements `From<char>`.][73466]
1797 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1798 integer types.][73032]
1799 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1800 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1801 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1802 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1803 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1804 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1809 - [`vec::Drain::as_slice`]
1813 Added a number of new environment variables that are now available when
1814 compiling your crate.
1816 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1817 the specific binary being compiled and the name of the crate.
1818 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1819 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1823 - [The target configuration option `abi_blacklist` has been renamed
1824 to `unsupported_abis`.][74150] The old name will still continue to work.
1825 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1826 This was previously accepted but will become a hard error in a future release.
1827 - [Rustc will fail to compile if you have a struct with
1828 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1830 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1831 ensure that spans have the correct information, and may cause breakage if you
1832 were relying on receiving spans with dummy information.
1833 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1834 a legacy installer that was replaced by a MSI installer a few years ago but
1835 was still being built.
1836 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1837 - [Rustc will no longer accept overlapping trait implementations that only
1838 differ in how the lifetime was bound.][72493]
1839 - [Rustc now correctly relates the lifetime of an existential associated
1840 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1841 you to pass a shorter lifetime than expected.
1842 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1843 The library will need to be installed for `rustc` to work, even though we
1844 expect it to be already available on most systems.
1845 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1847 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1848 exact output returned by rustc's pretty printing is an unstable
1849 implementation detail: we recommend any macro relying on it to switch to a
1850 more robust parsing system.
1852 [75453]: https://github.com/rust-lang/rust/issues/75453/
1853 [74820]: https://github.com/rust-lang/rust/issues/74820/
1854 [74420]: https://github.com/rust-lang/rust/issues/74420/
1855 [74109]: https://github.com/rust-lang/rust/pull/74109/
1856 [74150]: https://github.com/rust-lang/rust/pull/74150/
1857 [73862]: https://github.com/rust-lang/rust/pull/73862/
1858 [73887]: https://github.com/rust-lang/rust/pull/73887/
1859 [73466]: https://github.com/rust-lang/rust/pull/73466/
1860 [73516]: https://github.com/rust-lang/rust/pull/73516/
1861 [73293]: https://github.com/rust-lang/rust/pull/73293/
1862 [73007]: https://github.com/rust-lang/rust/pull/73007/
1863 [73032]: https://github.com/rust-lang/rust/pull/73032/
1864 [72920]: https://github.com/rust-lang/rust/pull/72920/
1865 [72569]: https://github.com/rust-lang/rust/pull/72569/
1866 [72583]: https://github.com/rust-lang/rust/pull/72583/
1867 [72584]: https://github.com/rust-lang/rust/pull/72584/
1868 [72717]: https://github.com/rust-lang/rust/pull/72717/
1869 [72437]: https://github.com/rust-lang/rust/pull/72437/
1870 [72445]: https://github.com/rust-lang/rust/pull/72445/
1871 [72486]: https://github.com/rust-lang/rust/pull/72486/
1872 [72493]: https://github.com/rust-lang/rust/pull/72493/
1873 [72331]: https://github.com/rust-lang/rust/pull/72331/
1874 [71896]: https://github.com/rust-lang/rust/pull/71896/
1875 [71660]: https://github.com/rust-lang/rust/pull/71660/
1876 [71322]: https://github.com/rust-lang/rust/pull/71322/
1877 [70740]: https://github.com/rust-lang/rust/pull/70740/
1878 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1879 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1880 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1881 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1882 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1885 Version 1.45.2 (2020-08-03)
1886 ==========================
1888 * [Fix bindings in tuple struct patterns][74954]
1889 * [Fix track_caller integration with trait objects][74784]
1891 [74954]: https://github.com/rust-lang/rust/issues/74954
1892 [74784]: https://github.com/rust-lang/rust/issues/74784
1895 Version 1.45.1 (2020-07-30)
1896 ==========================
1898 * [Fix const propagation with references.][73613]
1899 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1900 * [Avoid spurious implicit region bound.][74509]
1901 * [Install clippy on x.py install][74457]
1903 [73613]: https://github.com/rust-lang/rust/pull/73613
1904 [73078]: https://github.com/rust-lang/rust/issues/73078
1905 [74509]: https://github.com/rust-lang/rust/pull/74509
1906 [74457]: https://github.com/rust-lang/rust/pull/74457
1909 Version 1.45.0 (2020-07-16)
1910 ==========================
1914 - [Out of range float to int conversions using `as` has been defined as a saturating
1915 conversion.][71269] This was previously undefined behaviour, but you can use the
1916 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1917 may be desirable in rare performance sensitive situations.
1918 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1919 using `u64`.][70705]
1920 - [Function like procedural macros can now be used in expression, pattern, and statement
1921 positions.][68717] This means you can now use a function-like procedural macro
1922 anywhere you can use a declarative (`macro_rules!`) macro.
1926 - [You can now override individual target features through the `target-feature`
1927 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1928 equivalent to `-C target-feature=+avx2,+fma`.
1929 - [Added the `force-unwind-tables` flag.][69984] This option allows
1930 rustc to always generate unwind tables regardless of panic strategy.
1931 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1932 to include LLVM bitcode into generated `rlib`s (this is on by default).
1933 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1934 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1935 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1936 - [Upgraded to LLVM 10.][67759]
1938 \* Refer to Rust's [platform support page][platform-support-doc] for more
1939 information on Rust's tiered platform support.
1944 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1946 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1947 - [You can now use `char` with
1948 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1949 a range of codepoints.][72413] E.g.
1950 you can now write the following;
1952 for ch in 'a'..='z' {
1956 // Prints "abcdefghijklmnopqrstuvwxyz"
1958 - [`OsString` now implements `FromStr`.][71662]
1959 - [The `saturating_neg` method has been added to all signed integer primitive
1960 types, and the `saturating_abs` method has been added for all integer
1961 primitive types.][71886]
1962 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1963 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1965 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1966 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1967 integer types.][69813]
1968 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1969 integer types.][72324]
1970 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1975 - [`BTreeMap::remove_entry`]
1977 - [`rc::Weak::as_ptr`]
1978 - [`rc::Weak::from_raw`]
1979 - [`rc::Weak::into_raw`]
1980 - [`str::strip_prefix`]
1981 - [`str::strip_suffix`]
1982 - [`sync::Weak::as_ptr`]
1983 - [`sync::Weak::from_raw`]
1984 - [`sync::Weak::into_raw`]
1985 - [`char::UNICODE_VERSION`]
1986 - [`Span::resolved_at`]
1987 - [`Span::located_at`]
1988 - [`Span::mixed_site`]
1989 - [`unix::process::CommandExt::arg0`]
1994 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1999 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2000 `~~outdated information~~` becomes "~~outdated information~~".
2001 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2005 - [Trying to self initialize a static value (that is creating a value using
2006 itself) is unsound and now causes a compile error.][71140]
2007 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2008 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2009 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2010 previously undocumented and not intended for public use. Rustdoc still provides
2011 a non-zero exit code on errors.
2012 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2013 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2014 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2015 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2016 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2020 - [Make clippy a git subtree instead of a git submodule][70655]
2021 - [Unify the undo log of all snapshot types][69464]
2023 [71848]: https://github.com/rust-lang/rust/issues/71848/
2024 [73420]: https://github.com/rust-lang/rust/issues/73420/
2025 [72324]: https://github.com/rust-lang/rust/pull/72324/
2026 [71843]: https://github.com/rust-lang/rust/pull/71843/
2027 [71886]: https://github.com/rust-lang/rust/pull/71886/
2028 [72234]: https://github.com/rust-lang/rust/pull/72234/
2029 [72239]: https://github.com/rust-lang/rust/pull/72239/
2030 [72397]: https://github.com/rust-lang/rust/pull/72397/
2031 [72413]: https://github.com/rust-lang/rust/pull/72413/
2032 [72014]: https://github.com/rust-lang/rust/pull/72014/
2033 [72062]: https://github.com/rust-lang/rust/pull/72062/
2034 [72094]: https://github.com/rust-lang/rust/pull/72094/
2035 [72133]: https://github.com/rust-lang/rust/pull/72133/
2036 [67759]: https://github.com/rust-lang/rust/pull/67759/
2037 [71900]: https://github.com/rust-lang/rust/pull/71900/
2038 [71928]: https://github.com/rust-lang/rust/pull/71928/
2039 [71662]: https://github.com/rust-lang/rust/pull/71662/
2040 [71716]: https://github.com/rust-lang/rust/pull/71716/
2041 [71447]: https://github.com/rust-lang/rust/pull/71447/
2042 [71269]: https://github.com/rust-lang/rust/pull/71269/
2043 [71095]: https://github.com/rust-lang/rust/pull/71095/
2044 [71140]: https://github.com/rust-lang/rust/pull/71140/
2045 [70655]: https://github.com/rust-lang/rust/pull/70655/
2046 [70705]: https://github.com/rust-lang/rust/pull/70705/
2047 [69984]: https://github.com/rust-lang/rust/pull/69984/
2048 [69813]: https://github.com/rust-lang/rust/pull/69813/
2049 [69464]: https://github.com/rust-lang/rust/pull/69464/
2050 [68717]: https://github.com/rust-lang/rust/pull/68717/
2051 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2052 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2053 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2054 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2055 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2056 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2057 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2058 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2059 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2060 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2061 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2062 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2063 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2064 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2065 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2066 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2067 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2070 Version 1.44.1 (2020-06-18)
2071 ===========================
2073 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2074 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2075 * [Fix crashes when finding backtrace on macOS.][71397]
2076 * [Clippy applies lint levels into different files.][clippy/5356]
2078 [71397]: https://github.com/rust-lang/rust/issues/71397
2079 [73078]: https://github.com/rust-lang/rust/issues/73078
2080 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2081 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2084 Version 1.44.0 (2020-06-04)
2085 ==========================
2089 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2090 - [Added the `unused_braces` lint.][70081]
2092 **Syntax-only changes**
2094 - [Expansion-driven outline module parsing][69838]
2099 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2104 These are still rejected semantically, so you will likely receive an error but
2105 these changes can be seen and parsed by macros and conditional compilation.
2109 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2110 Additionally when in incremental mode rustc defaults to 256 codegen units.
2111 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2112 a panic is thrown.][67502]
2113 - [Added tier 3\* support for the `aarch64-unknown-none` and
2114 `aarch64-unknown-none-softfloat` targets.][68334]
2115 - [Added tier 3 support for `arm64-apple-tvos` and
2116 `x86_64-apple-tvos` targets.][68191]
2121 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2122 `vec![]` to be able to be used in `const` contexts.
2123 - [`convert::Infallible` now implements `Hash`.][70281]
2124 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2125 a `&mut OsStr`.][70048]
2126 - [Unicode 13 is now supported.][69929]
2127 - [`String` now implements `From<&mut str>`.][69661]
2128 - [`IoSlice` now implements `Copy`.][69403]
2129 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2130 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2131 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2132 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2133 integer types.][69373]
2137 - [`PathBuf::with_capacity`]
2138 - [`PathBuf::capacity`]
2139 - [`PathBuf::clear`]
2140 - [`PathBuf::reserve`]
2141 - [`PathBuf::reserve_exact`]
2142 - [`PathBuf::shrink_to_fit`]
2143 - [`f32::to_int_unchecked`]
2144 - [`f64::to_int_unchecked`]
2145 - [`Layout::align_to`]
2146 - [`Layout::pad_to_align`]
2148 - [`Layout::extend`]
2152 - [Added the `cargo tree` command which will print a tree graph of
2153 your dependencies.][cargo/8062] E.g.
2155 mdbook v0.3.2 (/Users/src/rust/mdbook)
2157 │ ├── html5ever v0.24.0
2159 │ │ │ └── cfg-if v0.1.9
2161 │ │ └── markup5ever v0.9.0
2162 │ │ ├── log v0.4.8 (*)
2164 │ │ │ └── phf_shared v0.7.24
2165 │ │ │ ├── siphasher v0.2.3
2166 │ │ │ └── unicase v1.4.2
2167 │ │ │ [build-dependencies]
2168 │ │ │ └── version_check v0.1.5
2171 You can also display dependencies on multiple versions of the same crate with
2172 `cargo tree -d` (short for `cargo tree --duplicates`).
2176 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2177 the version in the sidebar.][69494]
2181 - [Rustc now correctly generates static libraries on Windows GNU targets with
2182 the `.a` extension, rather than the previous `.lib`.][70937]
2183 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2184 - [The `file_name` property in JSON output of macro errors now points the actual
2185 source file rather than the previous format of `<NAME macros>`.][70969]
2186 **Note:** this may not point to a file that actually exists on the user's system.
2187 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2188 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2189 not allow zero initialization such as `NonZeroU8`.][66059] This was
2190 previously a warning.
2191 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2192 operator has been defined as a saturating operation.][71269] This was previously
2193 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2194 continue using the current behaviour, which may be desirable in rare performance
2195 sensitive situations.
2199 These changes provide no direct user facing benefits, but represent significant
2200 improvements to the internals and overall performance of rustc and
2203 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2204 - [Replace big JS dict with JSON parsing.][71250]
2206 [69373]: https://github.com/rust-lang/rust/pull/69373/
2207 [66059]: https://github.com/rust-lang/rust/pull/66059/
2208 [68191]: https://github.com/rust-lang/rust/pull/68191/
2209 [68899]: https://github.com/rust-lang/rust/pull/68899/
2210 [71147]: https://github.com/rust-lang/rust/pull/71147/
2211 [71250]: https://github.com/rust-lang/rust/pull/71250/
2212 [70937]: https://github.com/rust-lang/rust/pull/70937/
2213 [70969]: https://github.com/rust-lang/rust/pull/70969/
2214 [70632]: https://github.com/rust-lang/rust/pull/70632/
2215 [70281]: https://github.com/rust-lang/rust/pull/70281/
2216 [70345]: https://github.com/rust-lang/rust/pull/70345/
2217 [70048]: https://github.com/rust-lang/rust/pull/70048/
2218 [70081]: https://github.com/rust-lang/rust/pull/70081/
2219 [70156]: https://github.com/rust-lang/rust/pull/70156/
2220 [71269]: https://github.com/rust-lang/rust/pull/71269/
2221 [69838]: https://github.com/rust-lang/rust/pull/69838/
2222 [69929]: https://github.com/rust-lang/rust/pull/69929/
2223 [69661]: https://github.com/rust-lang/rust/pull/69661/
2224 [69778]: https://github.com/rust-lang/rust/pull/69778/
2225 [69494]: https://github.com/rust-lang/rust/pull/69494/
2226 [69403]: https://github.com/rust-lang/rust/pull/69403/
2227 [69033]: https://github.com/rust-lang/rust/pull/69033/
2228 [68692]: https://github.com/rust-lang/rust/pull/68692/
2229 [68334]: https://github.com/rust-lang/rust/pull/68334/
2230 [67502]: https://github.com/rust-lang/rust/pull/67502/
2231 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2232 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2233 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2234 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2235 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2236 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2237 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2238 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2239 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2240 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2241 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2242 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2243 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2246 Version 1.43.1 (2020-05-07)
2247 ===========================
2249 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2250 * [Fixed the stabilization of AVX-512 features.][71473]
2251 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2253 [71430]: https://github.com/rust-lang/rust/pull/71430
2254 [71473]: https://github.com/rust-lang/rust/issues/71473
2255 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2258 Version 1.43.0 (2020-04-23)
2259 ==========================
2263 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2264 the type inferred correctly.][68129]
2265 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2267 **Syntax only changes**
2268 - [Allow `type Foo: Ord` syntactically.][69361]
2269 - [Fuse associated and extern items up to defaultness.][69194]
2270 - [Syntactically allow `self` in all `fn` contexts.][68764]
2271 - [Merge `fn` syntax + cleanup item parsing.][68728]
2272 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2273 For example, you may now write:
2275 macro_rules! mac_trait {
2285 These are still rejected *semantically*, so you will likely receive an error but
2286 these changes can be seen and parsed by macros and
2287 conditional compilation.
2292 - [You can now pass multiple lint flags to rustc to override the previous
2293 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2294 everything in the `unused` lint group except `unused-variables` which
2295 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2296 everything in the `unused` lint group **including** `unused-variables` since
2297 the allow flag is specified before the deny flag (and therefore overridden).
2298 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2299 if they are available on `windows-gnu`.][67429]
2300 - [rustc now buffers errors/warnings printed in JSON.][69227]
2304 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2305 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2306 respectively.][69538] **Note** These conversions are only available when `N`
2308 - [You can now use associated constants on floats and integers directly, rather
2309 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2310 `f32::NAN` with no imports.
2311 - [`u8::is_ascii` is now `const`.][68984]
2312 - [`String` now implements `AsMut<str>`.][68742]
2313 - [Added the `primitive` module to `std` and `core`.][67637] This module
2314 reexports Rust's primitive types. This is mainly useful in macros
2315 where you want avoid these types being shadowed.
2316 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2317 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2321 - [`Once::is_completed`]
2326 - [`iter::once_with`]
2330 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2331 your environment.][cargo/7823]
2332 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2333 executable path when running integration tests or benchmarks.][cargo/7697]
2334 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2335 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2339 - [Certain checks in the `const_err` lint were deemed unrelated to const
2340 evaluation][69185], and have been moved to the `unconditional_panic` and
2341 `arithmetic_overflow` lints.
2346 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2347 has been a warning since 1.36.0.
2348 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2349 led to some instances being accepted, and now correctly emits a hard error.
2351 [69340]: https://github.com/rust-lang/rust/pull/69340
2355 These changes provide no direct user facing benefits, but represent significant
2356 improvements to the internals and overall performance of `rustc` and
2359 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2360 - [Improved how rustc generates drop code.][67332]
2361 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2362 - [traits: preallocate 2 Vecs of known initial size][69022]
2363 - [Avoid exponential behaviour when relating types][68772]
2364 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2365 - [Improve performance of coherence checks][68966]
2366 - [Deduplicate types in the generator witness][68672]
2367 - [Invert control in struct_lint_level.][68725]
2369 [67332]: https://github.com/rust-lang/rust/pull/67332/
2370 [67429]: https://github.com/rust-lang/rust/pull/67429/
2371 [67637]: https://github.com/rust-lang/rust/pull/67637/
2372 [67642]: https://github.com/rust-lang/rust/pull/67642/
2373 [67878]: https://github.com/rust-lang/rust/pull/67878/
2374 [67885]: https://github.com/rust-lang/rust/pull/67885/
2375 [68129]: https://github.com/rust-lang/rust/pull/68129/
2376 [68672]: https://github.com/rust-lang/rust/pull/68672/
2377 [68725]: https://github.com/rust-lang/rust/pull/68725/
2378 [68728]: https://github.com/rust-lang/rust/pull/68728/
2379 [68738]: https://github.com/rust-lang/rust/pull/68738/
2380 [68742]: https://github.com/rust-lang/rust/pull/68742/
2381 [68764]: https://github.com/rust-lang/rust/pull/68764/
2382 [68772]: https://github.com/rust-lang/rust/pull/68772/
2383 [68943]: https://github.com/rust-lang/rust/pull/68943/
2384 [68952]: https://github.com/rust-lang/rust/pull/68952/
2385 [68966]: https://github.com/rust-lang/rust/pull/68966/
2386 [68984]: https://github.com/rust-lang/rust/pull/68984/
2387 [69022]: https://github.com/rust-lang/rust/pull/69022/
2388 [69185]: https://github.com/rust-lang/rust/pull/69185/
2389 [69194]: https://github.com/rust-lang/rust/pull/69194/
2390 [69201]: https://github.com/rust-lang/rust/pull/69201/
2391 [69227]: https://github.com/rust-lang/rust/pull/69227/
2392 [69548]: https://github.com/rust-lang/rust/pull/69548/
2393 [69256]: https://github.com/rust-lang/rust/pull/69256/
2394 [69361]: https://github.com/rust-lang/rust/pull/69361/
2395 [69366]: https://github.com/rust-lang/rust/pull/69366/
2396 [69538]: https://github.com/rust-lang/rust/pull/69538/
2397 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2398 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2399 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2400 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2401 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2402 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2403 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2404 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2407 Version 1.42.0 (2020-03-12)
2408 ==========================
2412 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2414 fn foo(words: &[&str]) {
2416 ["Hello", "World", "!", ..] => println!("Hello World!"),
2417 ["Foo", "Bar", ..] => println!("Baz"),
2418 rest => println!("{:?}", rest),
2422 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2423 that you can create an enum that has the exact layout and ABI of the type
2425 - [You can now use outer attribute procedural macros on inline modules.][64273]
2426 - [There are some *syntax-only* changes:][67131]
2427 - `default` is syntactically allowed before items in `trait` definitions.
2428 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2429 leave out their bodies in favor of `;`.
2430 - Bounds on associated types in `impl`s are now syntactically allowed
2431 (e.g. `type Foo: Ord;`).
2432 - `...` (the C-variadic type) may occur syntactically directly as the type of
2433 any function parameter.
2435 These are still rejected *semantically*, so you will likely receive an error
2436 but these changes can be seen and parsed by procedural macros and
2437 conditional compilation.
2441 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2442 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2443 - [`Option::{expect,unwrap}` and
2444 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2445 pointing to the location where they were called, rather than
2446 `core`'s internals. ][67887]
2448 \* Refer to Rust's [platform support page][platform-support-doc] for more
2449 information on Rust's tiered platform support.
2453 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2454 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2455 to implement `Sized`.][67935]
2456 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2457 - [`Layout::new` is now `const`.][66254]
2458 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2463 - [`CondVar::wait_while`]
2464 - [`CondVar::wait_timeout_while`]
2466 - [`DebugMap::value`]
2467 - [`ManuallyDrop::take`]
2469 - [`ptr::slice_from_raw_parts_mut`]
2470 - [`ptr::slice_from_raw_parts`]
2474 - [You no longer need to include `extern crate proc_macro;` to be able to
2475 `use proc_macro;` in the `2018` edition.][cargo/7700]
2479 - [`Error::description` has been deprecated, and its use will now produce a
2480 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2482 [68253]: https://github.com/rust-lang/rust/pull/68253/
2483 [68348]: https://github.com/rust-lang/rust/pull/68348/
2484 [67935]: https://github.com/rust-lang/rust/pull/67935/
2485 [68339]: https://github.com/rust-lang/rust/pull/68339/
2486 [68122]: https://github.com/rust-lang/rust/pull/68122/
2487 [64273]: https://github.com/rust-lang/rust/pull/64273/
2488 [67712]: https://github.com/rust-lang/rust/pull/67712/
2489 [67887]: https://github.com/rust-lang/rust/pull/67887/
2490 [67131]: https://github.com/rust-lang/rust/pull/67131/
2491 [67233]: https://github.com/rust-lang/rust/pull/67233/
2492 [66899]: https://github.com/rust-lang/rust/pull/66899/
2493 [66919]: https://github.com/rust-lang/rust/pull/66919/
2494 [66254]: https://github.com/rust-lang/rust/pull/66254/
2495 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2496 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2497 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2498 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2499 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2500 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2501 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2502 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2503 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2506 Version 1.41.1 (2020-02-27)
2507 ===========================
2509 * [Always check types of static items][69145]
2510 * [Always check lifetime bounds of `Copy` impls][69145]
2511 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2513 [69225]: https://github.com/rust-lang/rust/issues/69225
2514 [69145]: https://github.com/rust-lang/rust/pull/69145
2517 Version 1.41.0 (2020-01-30)
2518 ===========================
2523 - [You can now pass type parameters to foreign items when implementing
2524 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2525 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2526 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2527 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2528 - [You can now use any valid identifier in a `format_args` macro.][66847]
2529 Previously identifiers starting with an underscore were not allowed.
2530 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2531 enum variants.][66183] These are still rejected semantically, but
2532 can be seen and parsed by procedural macros and conditional compilation.
2533 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2534 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2535 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2537 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2542 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2543 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2544 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2545 - [You can now pass an arguments file passing the `@path` syntax
2546 to rustc.][66172] Note that the format differs somewhat from what is
2547 found in other tooling; please see [the documentation][argfile-docs] for
2549 - [You can now provide `--extern` flag without a path, indicating that it is
2550 available from the search path or specified with an `-L` flag.][64882]
2552 \* Refer to Rust's [platform support page][platform-support-doc] for more
2553 information on Rust's tiered platform support.
2555 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2560 - [The `core::panic` module is now stable.][66771] It was already stable
2562 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2563 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2564 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2569 - [`Result::map_or`]
2570 - [`Result::map_or_else`]
2571 - [`std::rc::Weak::weak_count`]
2572 - [`std::rc::Weak::strong_count`]
2573 - [`std::sync::Weak::weak_count`]
2574 - [`std::sync::Weak::strong_count`]
2579 - [Cargo will now document all the private items for binary crates
2580 by default.][cargo/7593]
2581 - [`cargo-install` will now reinstall the package if it detects that it is out
2582 of date.][cargo/7560]
2583 - [Cargo.lock now uses a more git friendly format that should help to reduce
2584 merge conflicts.][cargo/7579]
2585 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2586 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2587 optimisation level to `2` for debug builds. You can also use
2588 `[profile.<profile>.build-override]` to override build scripts and
2594 - [You can now specify `edition` in documentation code blocks to compile the block
2595 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2596 should be compiled the 2018 edition of Rust.
2597 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2598 current theme with `--check-theme`.][54733]
2599 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2604 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2605 Apple targets.][apple-32bit-drop] This means that the source code is still
2606 available to build, but the targets are no longer being tested and release
2607 binaries for those platforms will no longer be distributed by the Rust project.
2608 Please refer to the linked blog post for more information.
2610 [54733]: https://github.com/rust-lang/rust/pull/54733/
2611 [61351]: https://github.com/rust-lang/rust/pull/61351/
2612 [62514]: https://github.com/rust-lang/rust/pull/62514/
2613 [67255]: https://github.com/rust-lang/rust/pull/67255/
2614 [66661]: https://github.com/rust-lang/rust/pull/66661/
2615 [66771]: https://github.com/rust-lang/rust/pull/66771/
2616 [66847]: https://github.com/rust-lang/rust/pull/66847/
2617 [66238]: https://github.com/rust-lang/rust/pull/66238/
2618 [66277]: https://github.com/rust-lang/rust/pull/66277/
2619 [66325]: https://github.com/rust-lang/rust/pull/66325/
2620 [66172]: https://github.com/rust-lang/rust/pull/66172/
2621 [66183]: https://github.com/rust-lang/rust/pull/66183/
2622 [65879]: https://github.com/rust-lang/rust/pull/65879/
2623 [65013]: https://github.com/rust-lang/rust/pull/65013/
2624 [64882]: https://github.com/rust-lang/rust/pull/64882/
2625 [64325]: https://github.com/rust-lang/rust/pull/64325/
2626 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2627 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2628 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2629 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2630 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2631 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2632 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2633 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2634 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2635 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2636 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2638 Version 1.40.0 (2019-12-19)
2639 ===========================
2643 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2644 `const` contexts.][65188] e.g.
2647 pub struct Point(i32, i32);
2649 const ORIGIN: Point = {
2650 let constructor = Point;
2656 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2657 indicate that there may be variants or fields added in the future.][64639]
2658 For example this requires adding a wild-card branch (`_ => {}`) to any match
2659 statements on a non-exhaustive `enum`. [(RFC 2008)]
2660 - [You can now use function-like procedural macros in `extern` blocks and in
2661 type positions.][63931] e.g. `type Generated = macro!();`
2662 - [Function-like and attribute procedural macros can now emit
2663 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2664 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2665 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2666 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2670 - [Added tier 3 support\* for the
2671 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2672 - [Added tier 3 support for the
2673 `aarch64-unknown-none-softfloat` target.][64589]
2674 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2675 `mips64el-unknown-linux-muslabi64` targets.][65843]
2677 \* Refer to Rust's [platform support page][platform-support-doc] for more
2678 information on Rust's tiered platform support.
2682 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2686 - [`BTreeMap::get_key_value`]
2687 - [`HashMap::get_key_value`]
2688 - [`Option::as_deref_mut`]
2689 - [`Option::as_deref`]
2690 - [`Option::flatten`]
2691 - [`UdpSocket::peer_addr`]
2692 - [`f32::to_be_bytes`]
2693 - [`f32::to_le_bytes`]
2694 - [`f32::to_ne_bytes`]
2695 - [`f64::to_be_bytes`]
2696 - [`f64::to_le_bytes`]
2697 - [`f64::to_ne_bytes`]
2698 - [`f32::from_be_bytes`]
2699 - [`f32::from_le_bytes`]
2700 - [`f32::from_ne_bytes`]
2701 - [`f64::from_be_bytes`]
2702 - [`f64::from_le_bytes`]
2703 - [`f64::from_ne_bytes`]
2710 - [Cargo will now always display warnings, rather than only on
2711 fresh builds.][cargo/7450]
2712 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2713 now produce an error.][cargo/7507] Previously these flags were ignored.
2714 - [You can now publish `dev-dependencies` without including
2715 a `version`.][cargo/7333]
2719 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2720 when running documentation tests with `rustdoc`.][63803]
2724 - [As previously announced, any previous NLL warnings in the 2015 edition are
2725 now hard errors.][64221]
2726 - [The `include!` macro will now warn if it failed to include the
2727 entire file.][64284] The `include!` macro unintentionally only includes the
2728 first _expression_ in a file, and this can be unintuitive. This will become
2729 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2730 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2731 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2732 or `extern` blocks now correctly emits a hard error.
2734 [65294]: https://github.com/rust-lang/rust/pull/65294/
2735 [66103]: https://github.com/rust-lang/rust/pull/66103/
2736 [65843]: https://github.com/rust-lang/rust/pull/65843/
2737 [65188]: https://github.com/rust-lang/rust/pull/65188/
2738 [65092]: https://github.com/rust-lang/rust/pull/65092/
2739 [64589]: https://github.com/rust-lang/rust/pull/64589/
2740 [64639]: https://github.com/rust-lang/rust/pull/64639/
2741 [64221]: https://github.com/rust-lang/rust/pull/64221/
2742 [64284]: https://github.com/rust-lang/rust/pull/64284/
2743 [63931]: https://github.com/rust-lang/rust/pull/63931/
2744 [64035]: https://github.com/rust-lang/rust/pull/64035/
2745 [63674]: https://github.com/rust-lang/rust/pull/63674/
2746 [63803]: https://github.com/rust-lang/rust/pull/63803/
2747 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2748 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2749 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2750 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2751 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2752 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2753 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2754 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2755 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2756 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2757 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2758 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2759 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2760 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2761 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2762 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2763 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2764 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2765 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2766 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2767 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2768 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2769 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2770 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2771 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2774 Version 1.39.0 (2019-11-07)
2775 ===========================
2779 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2780 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2781 - [You can now use certain attributes on function, closure, and function pointer
2782 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2783 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2784 attributes applied to items. e.g.
2787 #[cfg(windows)] slice: &[u16],
2788 #[cfg(not(windows))] slice: &[u8],
2793 - [You can now take shared references to bind-by-move patterns in the `if` guards
2794 of `match` arms.][63118] e.g.
2797 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2801 // ---- `nums` is bound by move.
2802 if nums.iter().sum::<u8>() == 10
2803 // ^------ `.iter()` implicitly takes a reference to `nums`.
2806 // ----------- Legal as `nums` was bound by move and so we have ownership.
2808 _ => unreachable!(),
2817 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2818 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2819 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2820 **Note** Cargo currently doesn't use this feature. Refer to
2821 [cargo#7315][cargo/7315] to track this feature's progress.
2822 - [You can now pass `--show-output` argument to test binaries to print the
2823 output of successful tests.][62600]
2826 \* Refer to Rust's [platform support page][platform-support-doc] for more
2827 information on Rust's tiered platform support.
2831 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2832 - [`LinkedList::new` is now a `const` function.][63684]
2833 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2834 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2835 now `const`.][63786]
2839 - [`Pin::into_inner`]
2840 - [`Instant::checked_duration_since`]
2841 - [`Instant::saturating_duration_since`]
2845 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2846 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2847 `--all` is now deprecated.
2851 - [You can now pass `-Clinker` to rustdoc to control the linker used
2852 for compiling doctests.][63834]
2856 - [Code that was previously accepted by the old borrow checker, but rejected by
2857 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2858 previously a warning, and will also become a hard error in the Rust 2015
2859 edition in the 1.40.0 release.
2860 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2861 run tests.][63827] This should improve performance when running a large
2863 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2864 recommended to use the `?` operator instead.
2865 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2868 [62600]: https://github.com/rust-lang/rust/pull/62600/
2869 [62672]: https://github.com/rust-lang/rust/pull/62672/
2870 [63118]: https://github.com/rust-lang/rust/pull/63118/
2871 [63209]: https://github.com/rust-lang/rust/pull/63209/
2872 [63402]: https://github.com/rust-lang/rust/pull/63402/
2873 [63565]: https://github.com/rust-lang/rust/pull/63565/
2874 [63595]: https://github.com/rust-lang/rust/pull/63595/
2875 [63684]: https://github.com/rust-lang/rust/pull/63684/
2876 [63698]: https://github.com/rust-lang/rust/pull/63698/
2877 [63770]: https://github.com/rust-lang/rust/pull/63770/
2878 [63786]: https://github.com/rust-lang/rust/pull/63786/
2879 [63827]: https://github.com/rust-lang/rust/pull/63827/
2880 [63834]: https://github.com/rust-lang/rust/pull/63834/
2881 [64010]: https://github.com/rust-lang/rust/pull/64010/
2882 [64028]: https://github.com/rust-lang/rust/pull/64028/
2883 [64334]: https://github.com/rust-lang/rust/pull/64334/
2884 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2885 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2886 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2887 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2888 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2889 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2891 Version 1.38.0 (2019-09-26)
2892 ==========================
2896 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2897 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2901 - [Added pipelined compilation support to `rustc`.][62766] This will
2902 improve compilation times in some cases. For further information please refer
2903 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2904 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2905 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2906 `x86_64-uwp-windows-msvc` targets.][60260]
2907 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2908 `armv7-unknown-linux-musleabi` targets.][63107]
2909 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2910 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2911 - [Upgraded to LLVM 9.][62592]
2913 \* Refer to Rust's [platform support page][platform-support-doc] for more
2914 information on Rust's tiered platform support.
2918 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2919 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2920 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2921 is available at `std::clone::Clone`). This also makes all built-in macros
2922 available in `std`/`core` root. e.g. `std::include_bytes!`.
2923 - [`str::Chars` now implements `Debug`.][63000]
2924 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2925 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2926 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2927 - [Added euclidean remainder and division operations (`div_euclid`,
2928 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2929 `overflowing`, and `wrapping` versions are available for all
2931 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2932 `PartialEq`.][61491]
2933 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2937 - [`<*const T>::cast`]
2938 - [`<*mut T>::cast`]
2939 - [`Duration::as_secs_f32`]
2940 - [`Duration::as_secs_f64`]
2941 - [`Duration::div_f32`]
2942 - [`Duration::div_f64`]
2943 - [`Duration::from_secs_f32`]
2944 - [`Duration::from_secs_f64`]
2945 - [`Duration::mul_f32`]
2946 - [`Duration::mul_f64`]
2947 - [`any::type_name`]
2951 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2952 - [You can now pass the `--features` option multiple times to enable
2953 multiple features.][cargo/7084]
2958 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2962 - [`rustc` will now warn about some incorrect uses of
2963 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2967 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2969 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2970 issues][62896] with certain crates such as libc.
2972 [60260]: https://github.com/rust-lang/rust/pull/60260/
2973 [61457]: https://github.com/rust-lang/rust/pull/61457/
2974 [61491]: https://github.com/rust-lang/rust/pull/61491/
2975 [61884]: https://github.com/rust-lang/rust/pull/61884/
2976 [61953]: https://github.com/rust-lang/rust/pull/61953/
2977 [62042]: https://github.com/rust-lang/rust/pull/62042/
2978 [62528]: https://github.com/rust-lang/rust/pull/62528/
2979 [62583]: https://github.com/rust-lang/rust/pull/62583/
2980 [62735]: https://github.com/rust-lang/rust/pull/62735/
2981 [62766]: https://github.com/rust-lang/rust/pull/62766/
2982 [62784]: https://github.com/rust-lang/rust/pull/62784/
2983 [62592]: https://github.com/rust-lang/rust/pull/62592/
2984 [62785]: https://github.com/rust-lang/rust/issues/62785/
2985 [62814]: https://github.com/rust-lang/rust/pull/62814/
2986 [62896]: https://github.com/rust-lang/rust/issues/62896/
2987 [63000]: https://github.com/rust-lang/rust/pull/63000/
2988 [63056]: https://github.com/rust-lang/rust/pull/63056/
2989 [63107]: https://github.com/rust-lang/rust/pull/63107/
2990 [63346]: https://github.com/rust-lang/rust/pull/63346/
2991 [63421]: https://github.com/rust-lang/rust/pull/63421/
2992 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2993 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2994 [63048]: https://github.com/rust-lang/rust/pull/63048
2995 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2996 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2997 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2998 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2999 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3000 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3001 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3002 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3003 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3004 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3005 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3006 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3007 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3009 Version 1.37.0 (2019-08-15)
3010 ==========================
3014 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3015 [`Box`][62228], or an [array][62235] and unused.
3016 - [You can now use the `cfg` and `cfg_attr` attributes on
3017 generic parameters.][61547]
3018 - [You can now use enum variants through type alias.][61682] e.g. You can
3019 write the following:
3021 type MyOption = Option<u8>;
3023 fn increment_or_zero(x: MyOption) -> u8 {
3025 MyOption::Some(y) => y + 1,
3026 MyOption::None => 0,
3030 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3031 `const _: u32 = 5;`.
3032 - [You can now use `#[repr(align(X)]` on enums.][61229]
3033 - [The `?` Kleene macro operator is now available in the
3034 2015 edition.][60932]
3038 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3039 and `-C profile-use` flags.][61268] For more information on how to use profile
3040 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3041 - [The `rust-lldb` wrapper script should now work again.][61827]
3045 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3049 - [`BufReader::buffer`]
3050 - [`BufWriter::buffer`]
3051 - [`Cell::from_mut`]
3052 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3053 - [`DoubleEndedIterator::nth_back`]
3055 - [`Wrapping::reverse_bits`]
3056 - [`i128::reverse_bits`]
3057 - [`i16::reverse_bits`]
3058 - [`i32::reverse_bits`]
3059 - [`i64::reverse_bits`]
3060 - [`i8::reverse_bits`]
3061 - [`isize::reverse_bits`]
3062 - [`slice::copy_within`]
3063 - [`u128::reverse_bits`]
3064 - [`u16::reverse_bits`]
3065 - [`u32::reverse_bits`]
3066 - [`u64::reverse_bits`]
3067 - [`u8::reverse_bits`]
3068 - [`usize::reverse_bits`]
3072 - [`Cargo.lock` files are now included by default when publishing executable crates
3073 with executables.][cargo/7026]
3074 - [You can now specify `default-run="foo"` in `[package]` to specify the
3075 default executable to use for `cargo run`.][cargo/7056]
3082 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3083 Please transition your code to using the `..=` syntax for inclusive
3085 - [Using a trait object without the `dyn` will now warn by default.][61203]
3086 Please transition your code to use `dyn Trait` for trait objects instead.
3088 [62228]: https://github.com/rust-lang/rust/pull/62228/
3089 [62235]: https://github.com/rust-lang/rust/pull/62235/
3090 [61802]: https://github.com/rust-lang/rust/pull/61802/
3091 [61827]: https://github.com/rust-lang/rust/pull/61827/
3092 [61547]: https://github.com/rust-lang/rust/pull/61547/
3093 [61682]: https://github.com/rust-lang/rust/pull/61682/
3094 [61268]: https://github.com/rust-lang/rust/pull/61268/
3095 [61342]: https://github.com/rust-lang/rust/pull/61342/
3096 [61347]: https://github.com/rust-lang/rust/pull/61347/
3097 [61100]: https://github.com/rust-lang/rust/pull/61100/
3098 [61203]: https://github.com/rust-lang/rust/pull/61203/
3099 [61229]: https://github.com/rust-lang/rust/pull/61229/
3100 [60932]: https://github.com/rust-lang/rust/pull/60932/
3101 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3102 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3103 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3104 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3105 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3106 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3107 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3108 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3109 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3110 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3111 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3112 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3113 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3114 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3115 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3116 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3117 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3118 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3119 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3120 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3121 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3122 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3123 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3126 Version 1.36.0 (2019-07-04)
3127 ==========================
3131 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3132 - [The order of traits in trait objects no longer affects the semantics of that
3133 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3134 `dyn fmt::Debug + Send`, where this was previously not the case.
3138 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3139 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3140 - [`mem::needs_drop` is now available as a const fn.][60364]
3141 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3142 - [`String` now implements `BorrowMut<str>`.][60404]
3143 - [`io::Cursor` now implements `Default`.][60234]
3144 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3145 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3146 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3147 environment has access to heap memory allocation.
3148 - [`String` now implements `From<&String>`.][59825]
3149 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3150 return a tuple of each argument when there is multiple arguments.
3151 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3156 - [`VecDeque::rotate_left`]
3157 - [`VecDeque::rotate_right`]
3158 - [`Iterator::copied`]
3160 - [`io::IoSliceMut`]
3161 - [`Read::read_vectored`]
3162 - [`Write::write_vectored`]
3163 - [`str::as_mut_ptr`]
3164 - [`mem::MaybeUninit`]
3165 - [`pointer::align_offset`]
3166 - [`future::Future`]
3168 - [`task::RawWaker`]
3169 - [`task::RawWakerVTable`]
3175 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3176 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3178 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3182 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3189 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3190 longer recommended, and will be deprecated in 1.39.0.
3192 [60318]: https://github.com/rust-lang/rust/pull/60318/
3193 [60364]: https://github.com/rust-lang/rust/pull/60364/
3194 [60370]: https://github.com/rust-lang/rust/pull/60370/
3195 [60404]: https://github.com/rust-lang/rust/pull/60404/
3196 [60234]: https://github.com/rust-lang/rust/pull/60234/
3197 [60244]: https://github.com/rust-lang/rust/pull/60244/
3198 [58623]: https://github.com/rust-lang/rust/pull/58623/
3199 [59648]: https://github.com/rust-lang/rust/pull/59648/
3200 [59675]: https://github.com/rust-lang/rust/pull/59675/
3201 [59825]: https://github.com/rust-lang/rust/pull/59825/
3202 [59826]: https://github.com/rust-lang/rust/pull/59826/
3203 [59445]: https://github.com/rust-lang/rust/pull/59445/
3204 [59114]: https://github.com/rust-lang/rust/pull/59114/
3205 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3206 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3207 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3208 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3209 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3210 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3211 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3212 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3213 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3214 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3215 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3216 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3217 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3218 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3219 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3220 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3221 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3222 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3223 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3224 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3227 Version 1.35.0 (2019-05-23)
3228 ==========================
3232 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3233 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3234 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3236 unsafe fn call_unsafe(func: unsafe fn()) {
3241 unsafe { call_unsafe(|| {}); }
3248 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3249 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3250 - [Added the `wasm32-unknown-wasi` target.][59464]
3255 - [`Thread` will now show its ID in `Debug` output.][59460]
3256 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3257 - [`alloc::System` now implements `Default`.][59451]
3258 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3260 - [`char::{ToLowercase, ToUppercase}` now
3261 implement `ExactSizeIterator`.][58778]
3262 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3263 - [Removed the `Read` trait bounds
3264 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3265 - [You can now call the `dbg!` macro without any parameters to print the file
3266 and line where it is called.][57847]
3267 - [In place ASCII case conversions are now up to 4× faster.][59283]
3268 e.g. `str::make_ascii_lowercase`
3269 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3276 - [`RefCell::replace_with`]
3277 - [`RefCell::map_split`]
3279 - [`Range::contains`]
3280 - [`RangeFrom::contains`]
3281 - [`RangeTo::contains`]
3282 - [`RangeInclusive::contains`]
3283 - [`RangeToInclusive::contains`]
3284 - [`Option::copied`]
3288 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3289 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3294 - [The Rust toolchain is now available natively for musl based distros.][58575]
3296 [59460]: https://github.com/rust-lang/rust/pull/59460/
3297 [59464]: https://github.com/rust-lang/rust/pull/59464/
3298 [59500]: https://github.com/rust-lang/rust/pull/59500/
3299 [59512]: https://github.com/rust-lang/rust/pull/59512/
3300 [59580]: https://github.com/rust-lang/rust/pull/59580/
3301 [59283]: https://github.com/rust-lang/rust/pull/59283/
3302 [59451]: https://github.com/rust-lang/rust/pull/59451/
3303 [59076]: https://github.com/rust-lang/rust/pull/59076/
3304 [58778]: https://github.com/rust-lang/rust/pull/58778/
3305 [58717]: https://github.com/rust-lang/rust/pull/58717/
3306 [58369]: https://github.com/rust-lang/rust/pull/58369/
3307 [58423]: https://github.com/rust-lang/rust/pull/58423/
3308 [58080]: https://github.com/rust-lang/rust/pull/58080/
3309 [57847]: https://github.com/rust-lang/rust/pull/57847/
3310 [58575]: https://github.com/rust-lang/rust/pull/58575
3311 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3312 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3313 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3314 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3315 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3316 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3317 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3318 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3319 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3320 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3321 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3322 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3324 Version 1.34.2 (2019-05-14)
3325 ===========================
3327 * [Destabilize the `Error::type_id` function due to a security
3328 vulnerability][60785] ([CVE-2019-12083])
3330 [60785]: https://github.com/rust-lang/rust/pull/60785
3331 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3333 Version 1.34.1 (2019-04-25)
3334 ===========================
3336 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3337 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3338 * [Fix Clippy panic when checking some macros][clippy/3805]
3340 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3341 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3342 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3344 Version 1.34.0 (2019-04-11)
3345 ==========================
3349 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3350 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3352 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3353 `#[attr{}]` procedural macros.][57367]
3354 - [You can now write `extern crate self as foo;`][57407] to import your
3355 crate's root into the extern prelude.
3360 - [You can now target `riscv64imac-unknown-none-elf` and
3361 `riscv64gc-unknown-none-elf`.][58406]
3362 - [You can now enable linker plugin LTO optimisations with
3363 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3364 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3366 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3371 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3372 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3373 the `Hash` trait to create an iterator.
3374 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3375 methods.][58421] Most notably you no longer require the `Ord` trait to create
3377 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3378 for all numeric types.][58044]
3379 - [Indexing a `str` is now generic over all types that
3380 implement `SliceIndex<str>`.][57604]
3381 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3382 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3383 produce a warning if their returning type is unused.
3384 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3385 `overflowing_pow` are now available for all numeric types.][57873] These are
3386 equivalent to methods such as `wrapping_add` for the `pow` operation.
3394 * [`Error::type_id`]
3395 * [`atomic::AtomicI16`]
3396 * [`atomic::AtomicI32`]
3397 * [`atomic::AtomicI64`]
3398 * [`atomic::AtomicI8`]
3399 * [`atomic::AtomicU16`]
3400 * [`atomic::AtomicU32`]
3401 * [`atomic::AtomicU64`]
3402 * [`atomic::AtomicU8`]
3403 * [`convert::Infallible`]
3404 * [`convert::TryFrom`]
3405 * [`convert::TryInto`]
3407 * [`iter::successors`]
3408 * [`num::NonZeroI128`]
3409 * [`num::NonZeroI16`]
3410 * [`num::NonZeroI32`]
3411 * [`num::NonZeroI64`]
3412 * [`num::NonZeroI8`]
3413 * [`num::NonZeroIsize`]
3414 * [`slice::sort_by_cached_key`]
3415 * [`str::escape_debug`]
3416 * [`str::escape_default`]
3417 * [`str::escape_unicode`]
3418 * [`str::split_ascii_whitespace`]
3421 * [`Instant::checked_add`]
3422 * [`Instant::checked_sub`]
3423 * [`SystemTime::checked_add`]
3424 * [`SystemTime::checked_sub`]
3428 - [You can now use alternative registries to crates.io.][cargo/6654]
3432 - [You can now use the `?` operator in your documentation tests without manually
3433 adding `fn main() -> Result<(), _> {}`.][56470]
3437 - [`Command::before_exec` is being replaced by the unsafe method
3438 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3439 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3440 can now use `const` functions in `static` variables.
3442 [58370]: https://github.com/rust-lang/rust/pull/58370/
3443 [58406]: https://github.com/rust-lang/rust/pull/58406/
3444 [58421]: https://github.com/rust-lang/rust/pull/58421/
3445 [58166]: https://github.com/rust-lang/rust/pull/58166/
3446 [58044]: https://github.com/rust-lang/rust/pull/58044/
3447 [58057]: https://github.com/rust-lang/rust/pull/58057/
3448 [58059]: https://github.com/rust-lang/rust/pull/58059/
3449 [57809]: https://github.com/rust-lang/rust/pull/57809/
3450 [57873]: https://github.com/rust-lang/rust/pull/57873/
3451 [57604]: https://github.com/rust-lang/rust/pull/57604/
3452 [57367]: https://github.com/rust-lang/rust/pull/57367/
3453 [57407]: https://github.com/rust-lang/rust/pull/57407/
3454 [57425]: https://github.com/rust-lang/rust/pull/57425/
3455 [57106]: https://github.com/rust-lang/rust/pull/57106/
3456 [56470]: https://github.com/rust-lang/rust/pull/56470/
3457 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3458 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3459 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3460 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3461 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3462 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3463 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3464 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3465 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3466 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3467 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3468 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3469 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3470 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3471 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3472 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3473 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3474 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3475 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3476 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3477 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3478 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3479 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3480 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3481 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3482 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3483 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3484 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3485 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3486 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3487 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3490 Version 1.33.0 (2019-02-28)
3491 ==========================
3495 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3496 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3497 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3498 E.g. You can have match statement on a `u8` that covers `0..=255` and
3499 you would no longer be required to have a `_ => unreachable!()` case.
3500 - [You can now have multiple patterns in `if let` and `while let`
3501 expressions.][57532] You can do this with the same syntax as a `match`
3511 let state = Creature::Crab("Ferris");
3513 if let Creature::Crab(name) | Creature::Person(name) = state {
3514 println!("This creature's name is: {}", name);
3518 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3519 this feature will by default produce a warning as this behaviour can be
3520 unintuitive. E.g. `if let _ = 5 {}`
3521 - [You can now use `let` bindings, assignments, expression statements,
3522 and irrefutable pattern destructuring in const functions.][57175]
3523 - [You can now call unsafe const functions.][57067] E.g.
3525 const unsafe fn foo() -> i32 { 5 }
3526 const fn bar() -> i32 {
3530 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3531 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3532 - [You can now specify a specific alignment with the `#[repr(packed)]`
3533 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3534 with an alignment of 2 bytes and a size of 6 bytes.
3535 - [You can now import an item from a module as an `_`.][56303] This allows you to
3536 import a trait's impls, and not have the name in the namespace. E.g.
3538 use std::io::Read as _;
3540 // Allowed as there is only one `Read` in the module.
3543 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3547 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3548 command line argument.][56351]
3549 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3550 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3551 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3552 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3553 information on Rust's platform support.
3554 - [Added support for the `thumbv7neon-linux-androideabi` and
3555 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3556 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3560 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3561 functions for all numeric types.][57566]
3562 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3563 are now `const` functions for all numeric types.][57105]
3564 - [The methods `is_positive` and `is_negative` are now `const` functions for
3565 all signed numeric types.][57105]
3566 - [The `get` method for all `NonZero` types is now `const`.][57167]
3567 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3568 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3569 numeric types.][57234]
3570 - [`Ipv4Addr::new` is now a `const` function][57234]
3574 - [`unix::FileExt::read_exact_at`]
3575 - [`unix::FileExt::write_all_at`]
3576 - [`Option::transpose`]
3577 - [`Result::transpose`]
3578 - [`convert::identity`]
3581 - [`marker::PhantomPinned`]
3582 - [`Vec::resize_with`]
3583 - [`VecDeque::resize_with`]
3584 - [`Duration::as_millis`]
3585 - [`Duration::as_micros`]
3586 - [`Duration::as_nanos`]
3591 - [You can now publish crates that require a feature flag to compile with
3592 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3593 - [Cargo should now rebuild a crate if a file was modified during the initial
3598 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3599 are now deprecated in the standard library, and their usage will now produce a warning.
3600 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3602 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3604 - [Libtest no longer creates a new thread for each test when
3605 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3607 [56243]: https://github.com/rust-lang/rust/pull/56243
3608 [56303]: https://github.com/rust-lang/rust/pull/56303/
3609 [56351]: https://github.com/rust-lang/rust/pull/56351/
3610 [56362]: https://github.com/rust-lang/rust/pull/56362
3611 [56642]: https://github.com/rust-lang/rust/pull/56642/
3612 [56769]: https://github.com/rust-lang/rust/pull/56769/
3613 [56805]: https://github.com/rust-lang/rust/pull/56805
3614 [56947]: https://github.com/rust-lang/rust/pull/56947/
3615 [57049]: https://github.com/rust-lang/rust/pull/57049/
3616 [57067]: https://github.com/rust-lang/rust/pull/57067/
3617 [57105]: https://github.com/rust-lang/rust/pull/57105
3618 [57130]: https://github.com/rust-lang/rust/pull/57130/
3619 [57167]: https://github.com/rust-lang/rust/pull/57167/
3620 [57175]: https://github.com/rust-lang/rust/pull/57175/
3621 [57234]: https://github.com/rust-lang/rust/pull/57234/
3622 [57332]: https://github.com/rust-lang/rust/pull/57332/
3623 [57465]: https://github.com/rust-lang/rust/pull/57465/
3624 [57532]: https://github.com/rust-lang/rust/pull/57532/
3625 [57535]: https://github.com/rust-lang/rust/pull/57535/
3626 [57566]: https://github.com/rust-lang/rust/pull/57566/
3627 [57615]: https://github.com/rust-lang/rust/pull/57615/
3628 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3629 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3630 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3631 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3632 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3633 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3634 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3635 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3636 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3637 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3638 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3639 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3640 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3641 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3642 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3643 [platform-support]: https://forge.rust-lang.org/platform-support.html
3645 Version 1.32.0 (2019-01-17)
3646 ==========================
3651 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3652 operator allows you to specify zero or one repetitions similar to the `*` and
3654 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3655 now always resolve to the item (`enum`, `struct`, etc.) available in the
3656 module if present, before resolving to a external crate or an item the prelude.][56759]
3659 enum Color { Red, Green, Blue }
3665 - [You can now match against `PhantomData<T>` types.][55837]
3666 - [You can now match against literals in macros with the `literal`
3667 specifier.][56072] This will match against a literal of any type.
3668 E.g. `1`, `'A'`, `"Hello World"`
3669 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3671 struct Point(i32, i32);
3674 pub fn new(x: i32, y: i32) -> Self {
3678 pub fn is_origin(&self) -> bool {
3686 - [Self can also now be used in type definitions.][56366] E.g.
3690 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3693 Cons(T, Box<Self>) // likewise here
3696 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3697 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3701 - [The default allocator has changed from jemalloc to the default allocator on
3702 your system.][55238] The compiler itself on Linux & macOS will still use
3703 jemalloc, but programs compiled with it will use the system allocator.
3704 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3708 - [`PathBuf` now implements `FromStr`.][55148]
3709 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3710 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3711 easily debug expressions in your rust program. E.g.
3714 let b = dbg!(a * 2) + 1;
3715 // ^-- prints: [src/main.rs:4] a * 2 = 4
3719 The following APIs are now `const` functions and can be used in a
3723 - [`UnsafeCell::get`]
3724 - [`char::is_ascii`]
3726 - [`ManuallyDrop::new`]
3727 - [`ManuallyDrop::into_inner`]
3728 - [`RangeInclusive::start`]
3729 - [`RangeInclusive::end`]
3730 - [`NonNull::as_ptr`]
3733 - [`Duration::as_secs`]
3734 - [`Duration::subsec_millis`]
3735 - [`Duration::subsec_micros`]
3736 - [`Duration::subsec_nanos`]
3738 - [`Ipv4Addr::is_unspecified`]
3740 - [`Ipv6Addr::octets`]
3744 - [`i8::to_be_bytes`]
3745 - [`i8::to_le_bytes`]
3746 - [`i8::to_ne_bytes`]
3747 - [`i8::from_be_bytes`]
3748 - [`i8::from_le_bytes`]
3749 - [`i8::from_ne_bytes`]
3750 - [`i16::to_be_bytes`]
3751 - [`i16::to_le_bytes`]
3752 - [`i16::to_ne_bytes`]
3753 - [`i16::from_be_bytes`]
3754 - [`i16::from_le_bytes`]
3755 - [`i16::from_ne_bytes`]
3756 - [`i32::to_be_bytes`]
3757 - [`i32::to_le_bytes`]
3758 - [`i32::to_ne_bytes`]
3759 - [`i32::from_be_bytes`]
3760 - [`i32::from_le_bytes`]
3761 - [`i32::from_ne_bytes`]
3762 - [`i64::to_be_bytes`]
3763 - [`i64::to_le_bytes`]
3764 - [`i64::to_ne_bytes`]
3765 - [`i64::from_be_bytes`]
3766 - [`i64::from_le_bytes`]
3767 - [`i64::from_ne_bytes`]
3768 - [`i128::to_be_bytes`]
3769 - [`i128::to_le_bytes`]
3770 - [`i128::to_ne_bytes`]
3771 - [`i128::from_be_bytes`]
3772 - [`i128::from_le_bytes`]
3773 - [`i128::from_ne_bytes`]
3774 - [`isize::to_be_bytes`]
3775 - [`isize::to_le_bytes`]
3776 - [`isize::to_ne_bytes`]
3777 - [`isize::from_be_bytes`]
3778 - [`isize::from_le_bytes`]
3779 - [`isize::from_ne_bytes`]
3780 - [`u8::to_be_bytes`]
3781 - [`u8::to_le_bytes`]
3782 - [`u8::to_ne_bytes`]
3783 - [`u8::from_be_bytes`]
3784 - [`u8::from_le_bytes`]
3785 - [`u8::from_ne_bytes`]
3786 - [`u16::to_be_bytes`]
3787 - [`u16::to_le_bytes`]
3788 - [`u16::to_ne_bytes`]
3789 - [`u16::from_be_bytes`]
3790 - [`u16::from_le_bytes`]
3791 - [`u16::from_ne_bytes`]
3792 - [`u32::to_be_bytes`]
3793 - [`u32::to_le_bytes`]
3794 - [`u32::to_ne_bytes`]
3795 - [`u32::from_be_bytes`]
3796 - [`u32::from_le_bytes`]
3797 - [`u32::from_ne_bytes`]
3798 - [`u64::to_be_bytes`]
3799 - [`u64::to_le_bytes`]
3800 - [`u64::to_ne_bytes`]
3801 - [`u64::from_be_bytes`]
3802 - [`u64::from_le_bytes`]
3803 - [`u64::from_ne_bytes`]
3804 - [`u128::to_be_bytes`]
3805 - [`u128::to_le_bytes`]
3806 - [`u128::to_ne_bytes`]
3807 - [`u128::from_be_bytes`]
3808 - [`u128::from_le_bytes`]
3809 - [`u128::from_ne_bytes`]
3810 - [`usize::to_be_bytes`]
3811 - [`usize::to_le_bytes`]
3812 - [`usize::to_ne_bytes`]
3813 - [`usize::from_be_bytes`]
3814 - [`usize::from_le_bytes`]
3815 - [`usize::from_ne_bytes`]
3819 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3820 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3824 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3828 - [The argument types for AVX's
3829 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3830 been changed from `*const` to `*mut` as the previous implementation
3834 [55148]: https://github.com/rust-lang/rust/pull/55148/
3835 [55238]: https://github.com/rust-lang/rust/pull/55238/
3836 [55280]: https://github.com/rust-lang/rust/pull/55280/
3837 [55610]: https://github.com/rust-lang/rust/pull/55610/
3838 [55663]: https://github.com/rust-lang/rust/pull/55663/
3839 [55702]: https://github.com/rust-lang/rust/pull/55702/
3840 [55837]: https://github.com/rust-lang/rust/pull/55837/
3841 [55843]: https://github.com/rust-lang/rust/pull/55843/
3842 [56072]: https://github.com/rust-lang/rust/pull/56072/
3843 [56245]: https://github.com/rust-lang/rust/pull/56245/
3844 [56365]: https://github.com/rust-lang/rust/pull/56365/
3845 [56366]: https://github.com/rust-lang/rust/pull/56366/
3846 [56395]: https://github.com/rust-lang/rust/pull/56395/
3847 [56759]: https://github.com/rust-lang/rust/pull/56759/
3848 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3849 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3850 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3851 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3852 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3853 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3854 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3855 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3856 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3857 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3858 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3859 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3860 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3861 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3862 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3863 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3864 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3865 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3866 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3867 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3868 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3869 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3870 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3871 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3872 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3873 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3874 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3875 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3876 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3877 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3878 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3879 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3880 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3881 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3882 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3883 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3884 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3885 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3886 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3887 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3888 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3889 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3890 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3891 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3892 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3893 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3894 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3895 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3896 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3897 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3898 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3899 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3900 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3901 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3902 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3903 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3904 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3905 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3906 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3907 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3908 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3909 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3910 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3911 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3912 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3913 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3914 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3915 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3916 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3917 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3918 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3919 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3920 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3921 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3922 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3923 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3924 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3925 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3926 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3927 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3928 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3929 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3930 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3931 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3932 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3933 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3934 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3935 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3936 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3937 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3938 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3939 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3940 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3943 Version 1.31.1 (2018-12-20)
3944 ===========================
3946 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3947 - [Fix broken go-to-definition in RLS][rls/1171]
3948 - [Fix infinite loop on hover in RLS][rls/1170]
3950 [56562]: https://github.com/rust-lang/rust/pull/56562
3951 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3952 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3954 Version 1.31.0 (2018-12-06)
3955 ==========================
3959 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3960 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3961 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3962 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3964 - [You can now define and use `const` functions.][54835] These are currently
3965 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3966 [language reference][const-reference] for what exactly is available.
3967 - [You can now use tool lints, which allow you to scope lints from external
3968 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3969 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3970 a crate, not just in exported functions.][54451]
3971 - [You can now use parentheses in pattern matches.][54497]
3975 - [Updated musl to 1.1.20][54430]
3979 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3980 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3981 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3982 into `Option<&mut T>` using the `From` trait.][53218]
3983 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3988 - [`slice::align_to`]
3989 - [`slice::align_to_mut`]
3990 - [`slice::chunks_exact`]
3991 - [`slice::chunks_exact_mut`]
3992 - [`slice::rchunks`]
3993 - [`slice::rchunks_mut`]
3994 - [`slice::rchunks_exact`]
3995 - [`slice::rchunks_exact_mut`]
3996 - [`Option::replace`]
4000 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4001 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4002 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4004 [52813]: https://github.com/rust-lang/rust/pull/52813/
4005 [53218]: https://github.com/rust-lang/rust/pull/53218/
4006 [54057]: https://github.com/rust-lang/rust/pull/54057/
4007 [54240]: https://github.com/rust-lang/rust/pull/54240/
4008 [54430]: https://github.com/rust-lang/rust/pull/54430/
4009 [54451]: https://github.com/rust-lang/rust/pull/54451/
4010 [54497]: https://github.com/rust-lang/rust/pull/54497/
4011 [54778]: https://github.com/rust-lang/rust/pull/54778/
4012 [54835]: https://github.com/rust-lang/rust/pull/54835/
4013 [54870]: https://github.com/rust-lang/rust/pull/54870/
4014 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4015 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4016 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4017 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4018 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4019 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4020 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4021 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4022 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4023 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4024 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4025 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4026 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4027 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4029 Version 1.30.1 (2018-11-08)
4030 ===========================
4032 - [Fixed overflow ICE in rustdoc][54199]
4033 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4035 [54199]: https://github.com/rust-lang/rust/pull/54199
4036 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4038 Version 1.30.0 (2018-10-25)
4039 ==========================
4043 - [Procedural macros are now available.][52081] These kinds of macros allow for
4044 more powerful code generation. There is a [new chapter available][proc-macros]
4045 in the Rust Programming Language book that goes further in depth.
4046 - [You can now use keywords as identifiers using the raw identifiers
4047 syntax (`r#`),][53236] e.g. `let r#for = true;`
4048 - [Using anonymous parameters in traits is now deprecated with a warning and
4049 will be a hard error in the 2018 edition.][53272]
4050 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4051 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4052 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4053 Previously, using a external crate in a module without a use statement
4054 required `let json = ::serde_json::from_str(foo);` but can now be written
4055 as `let json = serde_json::from_str(foo);`.
4056 - [You can now apply the `#[used]` attribute to static items to prevent the
4057 compiler from optimising them away, even if they appear to be unused,][51363]
4058 e.g. `#[used] static FOO: u32 = 1;`
4059 - [You can now import and reexport macros from other crates with the `use`
4060 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4061 the root module of the crate. If your macro relies on calling other local
4062 macros, it is recommended to export with the
4063 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4065 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4066 using the `vis` specifier.][53370]
4067 - [Non-macro attributes now allow all forms of literals, not just
4068 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4069 write `#[attr(true)]`.
4070 - [You can now specify a function to handle a panic in the Rust runtime with the
4071 `#[panic_handler]` attribute.][51366]
4075 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4076 - [Added the `aarch64-unknown-netbsd` target][53165]
4077 - [Upgraded to LLVM 8.][53611]
4081 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4085 - [`Ipv4Addr::BROADCAST`]
4086 - [`Ipv4Addr::LOCALHOST`]
4087 - [`Ipv4Addr::UNSPECIFIED`]
4088 - [`Ipv6Addr::LOCALHOST`]
4089 - [`Ipv6Addr::UNSPECIFIED`]
4090 - [`Iterator::find_map`]
4092 The following methods are replacement methods for `trim_left`, `trim_right`,
4093 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4095 - [`str::trim_end_matches`]
4097 - [`str::trim_start_matches`]
4098 - [`str::trim_start`]
4102 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4103 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4104 equivalent to calling `rustdoc --error-format=json`.
4105 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4109 - [`rustdoc` allows you to specify what edition to treat your code as with the
4110 `--edition` option.][54057]
4111 - [`rustdoc` now has the `--color` (specify whether to output color) and
4112 `--error-format` (specify error format, e.g. `json`) options.][53003]
4113 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4114 debug symbols.][53774]
4115 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4116 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4118 [50911]: https://github.com/rust-lang/rust/pull/50911/
4119 [51363]: https://github.com/rust-lang/rust/pull/51363/
4120 [51366]: https://github.com/rust-lang/rust/pull/51366/
4121 [52081]: https://github.com/rust-lang/rust/pull/52081/
4122 [53003]: https://github.com/rust-lang/rust/pull/53003/
4123 [53033]: https://github.com/rust-lang/rust/pull/53033/
4124 [53044]: https://github.com/rust-lang/rust/pull/53044/
4125 [53165]: https://github.com/rust-lang/rust/pull/53165/
4126 [53611]: https://github.com/rust-lang/rust/pull/53611/
4127 [53236]: https://github.com/rust-lang/rust/pull/53236/
4128 [53272]: https://github.com/rust-lang/rust/pull/53272/
4129 [53370]: https://github.com/rust-lang/rust/pull/53370/
4130 [53459]: https://github.com/rust-lang/rust/pull/53459/
4131 [53774]: https://github.com/rust-lang/rust/pull/53774/
4132 [53822]: https://github.com/rust-lang/rust/pull/53822/
4133 [54057]: https://github.com/rust-lang/rust/pull/54057/
4134 [54404]: https://github.com/rust-lang/rust/pull/54404/
4135 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4136 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4137 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4138 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4140 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4141 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4142 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4143 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4144 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4145 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4146 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4147 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4148 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4149 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4152 Version 1.29.2 (2018-10-11)
4153 ===========================
4155 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4156 - The `rls-preview` component on the windows-gnu targets has been restored.
4158 [54639]: https://github.com/rust-lang/rust/pull/54639
4161 Version 1.29.1 (2018-09-25)
4162 ===========================
4167 - The standard library's `str::repeat` function contained an out of bounds write
4168 caused by an integer overflow. This has been fixed by deterministically
4169 panicking when an overflow happens.
4171 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4175 Version 1.29.0 (2018-09-13)
4176 ==========================
4180 - [Bumped minimum LLVM version to 5.0.][51899]
4181 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4182 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4183 - [Upgraded to LLVM 7.][51966]
4187 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4188 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4189 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4190 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4192 - [`Cell<T>` now allows `T` to be unsized.][50494]
4193 - [`SocketAddr` is now stable on Redox.][52656]
4198 - [`Iterator::flatten`]
4203 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4204 `--locked` to disable this behavior.
4205 - [`cargo-install` will now allow you to cross compile an install
4206 using `--target`.][cargo/5614]
4207 - [Added the `cargo-fix` subcommand to automatically move project code from
4208 2015 edition to 2018.][cargo/5723]
4209 - [`cargo doc` can now optionally document private types using the
4210 `--document-private-items` flag.][cargo/5543]
4214 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4215 the specified level to that level.][52354] For example `--cap-lints warn`
4216 will demote `deny` and `forbid` lints to `warn`.
4217 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4218 fails and `101` if there is a panic.][52197]
4219 - [A preview of clippy has been made available through rustup.][51122]
4220 You can install the preview with `rustup component add clippy-preview`.
4224 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4225 Use `str::get_unchecked(begin..end)` instead.
4226 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4227 Consider using the `home_dir` function from
4228 https://crates.io/crates/dirs instead.
4229 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4230 - [`cfg` attributes and `--cfg` command line flags are now more
4231 strictly validated.][53893]
4233 [53893]: https://github.com/rust-lang/rust/pull/53893/
4234 [52861]: https://github.com/rust-lang/rust/pull/52861/
4235 [51966]: https://github.com/rust-lang/rust/pull/51966/
4236 [52656]: https://github.com/rust-lang/rust/pull/52656/
4237 [52239]: https://github.com/rust-lang/rust/pull/52239/
4238 [52330]: https://github.com/rust-lang/rust/pull/52330/
4239 [52354]: https://github.com/rust-lang/rust/pull/52354/
4240 [52402]: https://github.com/rust-lang/rust/pull/52402/
4241 [52197]: https://github.com/rust-lang/rust/pull/52197/
4242 [51807]: https://github.com/rust-lang/rust/pull/51807/
4243 [51899]: https://github.com/rust-lang/rust/pull/51899/
4244 [51912]: https://github.com/rust-lang/rust/pull/51912/
4245 [51619]: https://github.com/rust-lang/rust/pull/51619/
4246 [51656]: https://github.com/rust-lang/rust/pull/51656/
4247 [51178]: https://github.com/rust-lang/rust/pull/51178/
4248 [51122]: https://github.com/rust-lang/rust/pull/51122
4249 [50494]: https://github.com/rust-lang/rust/pull/50494/
4250 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4251 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4252 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4253 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4254 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4255 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4256 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4259 Version 1.28.0 (2018-08-02)
4260 ===========================
4264 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4265 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4266 the inner type across Foreign Function Interface (FFI) boundaries.
4267 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4268 and can now be used as identifiers.][51196]
4269 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4270 stable.][51241] This will allow users to specify a global allocator for
4272 - [Unit test functions marked with the `#[test]` attribute can now return
4273 `Result<(), E: Debug>` in addition to `()`.][51298]
4274 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4275 allows macros to easily target lifetimes.
4279 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4280 prioritise making smaller binary sizes. `z` is the same as `s` with the
4281 exception that it does not vectorise loops, which typically results in an even
4283 - [The short error format is now stable.][49546] Specified with
4284 `--error-format=short` this option will provide a more compressed output of
4285 rust error messages.
4286 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4287 - [Reduced the number of allocations in the macro parser.][50855] This can
4288 improve compile times of macro heavy crates on average by 5%.
4292 - [Implemented `Default` for `&mut str`.][51306]
4293 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4294 - [Implemented `Extend` for `()`.][50234]
4295 - [The `Debug` implementation of `time::Duration` should now be more easily
4296 human readable.][50364] Previously a `Duration` of one second would printed as
4297 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4298 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4299 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4300 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4301 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4302 for `PathBuf`.][50170]
4303 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4304 and `Wrapping<i128>`.][50465]
4305 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4306 possible.][51050] This can provide up to a 40% speed increase.
4307 - [Improved error messages when using `format!`.][50610]
4311 - [`Iterator::step_by`]
4312 - [`Path::ancestors`]
4313 - [`SystemTime::UNIX_EPOCH`]
4314 - [`alloc::GlobalAlloc`]
4316 - [`alloc::LayoutErr`]
4319 - [`alloc::alloc_zeroed`]
4320 - [`alloc::dealloc`]
4321 - [`alloc::realloc`]
4322 - [`alloc::handle_alloc_error`]
4323 - [`btree_map::Entry::or_default`]
4324 - [`fmt::Alignment`]
4325 - [`hash_map::Entry::or_default`]
4326 - [`iter::repeat_with`]
4327 - [`num::NonZeroUsize`]
4328 - [`num::NonZeroU128`]
4329 - [`num::NonZeroU16`]
4330 - [`num::NonZeroU32`]
4331 - [`num::NonZeroU64`]
4332 - [`num::NonZeroU8`]
4333 - [`ops::RangeBounds`]
4334 - [`slice::SliceIndex`]
4335 - [`slice::from_mut`]
4336 - [`slice::from_ref`]
4337 - [`{Any + Send + Sync}::downcast_mut`]
4338 - [`{Any + Send + Sync}::downcast_ref`]
4339 - [`{Any + Send + Sync}::is`]
4343 - [Cargo will now no longer allow you to publish crates with build scripts that
4344 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4345 considered to be immutable.
4349 - [The `suggestion_applicability` field in `rustc`'s json output is now
4350 stable.][50486] This will allow dev tools to check whether a code suggestion
4351 would apply to them.
4355 - [Rust will consider trait objects with duplicated constraints to be the same
4356 type as without the duplicated constraint.][51276] For example the below code will
4357 now fail to compile.
4362 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4365 impl Trait + Send + Send {
4366 fn test(&self) { println!("two"); }
4370 [49546]: https://github.com/rust-lang/rust/pull/49546/
4371 [50143]: https://github.com/rust-lang/rust/pull/50143/
4372 [50170]: https://github.com/rust-lang/rust/pull/50170/
4373 [50234]: https://github.com/rust-lang/rust/pull/50234/
4374 [50265]: https://github.com/rust-lang/rust/pull/50265/
4375 [50364]: https://github.com/rust-lang/rust/pull/50364/
4376 [50385]: https://github.com/rust-lang/rust/pull/50385/
4377 [50465]: https://github.com/rust-lang/rust/pull/50465/
4378 [50486]: https://github.com/rust-lang/rust/pull/50486/
4379 [50554]: https://github.com/rust-lang/rust/pull/50554/
4380 [50610]: https://github.com/rust-lang/rust/pull/50610/
4381 [50855]: https://github.com/rust-lang/rust/pull/50855/
4382 [51050]: https://github.com/rust-lang/rust/pull/51050/
4383 [51196]: https://github.com/rust-lang/rust/pull/51196/
4384 [51241]: https://github.com/rust-lang/rust/pull/51241/
4385 [51276]: https://github.com/rust-lang/rust/pull/51276/
4386 [51298]: https://github.com/rust-lang/rust/pull/51298/
4387 [51306]: https://github.com/rust-lang/rust/pull/51306/
4388 [51562]: https://github.com/rust-lang/rust/pull/51562/
4389 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4390 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4391 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4392 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4393 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4394 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4395 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4396 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4397 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4398 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4399 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4400 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4401 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4402 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4403 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4404 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4405 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4406 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4407 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4408 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4409 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4410 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4411 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4412 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4413 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4414 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4415 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4416 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4417 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4418 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4420 Version 1.27.2 (2018-07-20)
4421 ===========================
4426 - The borrow checker was fixed to avoid potential unsoundness when using
4427 match ergonomics: [#52213][52213].
4429 [52213]: https://github.com/rust-lang/rust/issues/52213
4431 Version 1.27.1 (2018-07-10)
4432 ===========================
4437 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4438 when running, which enabled executing code as some other user on a
4439 given machine. This release fixes that vulnerability; you can read
4440 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4442 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4447 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4448 match ergonomics: [#51415][51415], [#49534][49534].
4450 [51415]: https://github.com/rust-lang/rust/issues/51415
4451 [49534]: https://github.com/rust-lang/rust/issues/49534
4452 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4453 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4455 Version 1.27.0 (2018-06-21)
4456 ==========================
4460 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4461 be used as an identifier.
4462 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4463 bare `Trait` syntax, and should make it clearer when being used in tandem with
4464 `impl Trait` because it is equivalent to the following syntax:
4465 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4466 `Box<Trait> == Box<dyn Trait>`.
4467 - [Attributes on generic parameters such as types and lifetimes are
4468 now stable.][48851] e.g.
4469 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4470 - [The `#[must_use]` attribute can now also be used on functions as well as
4471 types.][48925] It provides a lint that by default warns users when the
4472 value returned by a function has not been used.
4476 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4480 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4481 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4482 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4483 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4484 the `cfg` attribute.
4485 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4486 std are now available in core.][49896]
4487 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4489 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4490 that the operation isn't done in place.
4491 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4492 the `#[must_use]` attribute][49533] to warn about unused potentially
4493 expensive allocations.
4497 - [`DoubleEndedIterator::rfind`]
4498 - [`DoubleEndedIterator::rfold`]
4499 - [`DoubleEndedIterator::try_rfold`]
4500 - [`Duration::from_micros`]
4501 - [`Duration::from_nanos`]
4502 - [`Duration::subsec_micros`]
4503 - [`Duration::subsec_millis`]
4504 - [`HashMap::remove_entry`]
4505 - [`Iterator::try_fold`]
4506 - [`Iterator::try_for_each`]
4508 - [`Option::filter`]
4509 - [`String::replace_range`]
4510 - [`Take::set_limit`]
4511 - [`hint::unreachable_unchecked`]
4512 - [`os::unix::process::parent_id`]
4513 - [`ptr::swap_nonoverlapping`]
4514 - [`slice::rsplit_mut`]
4516 - [`slice::swap_with_slice`]
4520 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4521 `readme`, and `repository` fields.][cargo/5386]
4522 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4523 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4524 a different directory than `target` for placing compilation artifacts.
4525 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4526 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4527 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4528 where cargo would infer a binary, Cargo will produce a warning. You can
4529 disable this feature ahead of time by setting any of the following to false:
4530 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4531 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4532 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4536 - [Added “The Rustc book” into the official documentation.][49707]
4537 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4538 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4542 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4543 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4544 compile, `"".is_empty()` will still compile.
4545 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4546 will only print the inner type.][48553] E.g.
4547 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4548 not `AtomicBool(true)`.
4549 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4550 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4551 alignment should cover all use cases.
4552 - The `.description()` method on the `std::error::Error` trait
4553 [has been soft-deprecated][50163]. It is no longer required to implement it.
4555 [48553]: https://github.com/rust-lang/rust/pull/48553/
4556 [48851]: https://github.com/rust-lang/rust/pull/48851/
4557 [48925]: https://github.com/rust-lang/rust/pull/48925/
4558 [49533]: https://github.com/rust-lang/rust/pull/49533/
4559 [49623]: https://github.com/rust-lang/rust/pull/49623/
4560 [49630]: https://github.com/rust-lang/rust/pull/49630/
4561 [49664]: https://github.com/rust-lang/rust/pull/49664/
4562 [49699]: https://github.com/rust-lang/rust/pull/49699/
4563 [49707]: https://github.com/rust-lang/rust/pull/49707/
4564 [49896]: https://github.com/rust-lang/rust/pull/49896/
4565 [49968]: https://github.com/rust-lang/rust/pull/49968/
4566 [50163]: https://github.com/rust-lang/rust/pull/50163
4567 [50177]: https://github.com/rust-lang/rust/pull/50177/
4568 [50378]: https://github.com/rust-lang/rust/pull/50378/
4569 [50423]: https://github.com/rust-lang/rust/pull/50423/
4570 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4571 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4572 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4573 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4574 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4575 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4576 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4577 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4578 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4579 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4580 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4581 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4582 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4583 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4584 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4585 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4586 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4587 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4588 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4589 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4590 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4591 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4592 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4593 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4594 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4595 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4596 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4597 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4598 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4601 Version 1.26.2 (2018-06-05)
4602 ==========================
4607 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4609 [51117]: https://github.com/rust-lang/rust/issues/51117
4612 Version 1.26.1 (2018-05-29)
4613 ==========================
4618 - [RLS now works on Windows.][50646]
4619 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4625 - [`fn main() -> impl Trait` no longer works for non-Termination
4627 This reverts an accidental stabilization.
4628 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4629 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4631 [50646]: https://github.com/rust-lang/rust/issues/50646
4632 [50656]: https://github.com/rust-lang/rust/pull/50656
4633 [50812]: https://github.com/rust-lang/rust/pull/50812
4634 [50950]: https://github.com/rust-lang/rust/issues/50950
4635 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4637 Version 1.26.0 (2018-05-10)
4638 ==========================
4642 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4643 implement either or both traits.][49299]
4644 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4645 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4646 lifetime can be elided.][49458]
4647 - [`impl Trait` is now stable allowing you to have abstract types in returns
4648 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4649 `fn open(path: impl AsRef<Path>)`.
4650 - [Pattern matching will now automatically apply dereferences.][49394]
4651 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4652 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4653 - [A lot of operations are now available in a const context.][46882] E.g. You
4654 can now index into constant arrays, reference and dereference into constants,
4655 and use tuple struct constructors.
4656 - [Fixed entry slice patterns are now stable.][48516] E.g.
4658 let points = [1, 2, 3, 4];
4660 [1, 2, 3, 4] => println!("All points were sequential."),
4661 _ => println!("Not all points were sequential."),
4668 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4669 - [Fixed exponential projection complexity on nested types.][48296]
4670 This can provide up to a ~12% reduction in compile times for certain crates.
4671 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4672 to remap path prefixes outputted by the compiler.
4673 - [Added `powerpc-unknown-netbsd` target.][48281]
4677 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4678 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4679 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4680 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4681 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4682 - [`ascii::escape_default` is now available in libcore.][48735]
4683 - [Trailing commas are now supported in std and core macros.][48056]
4684 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4685 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4690 - [`*const T::copy_to_nonoverlapping`]
4691 - [`*const T::copy_to`]
4692 - [`*const T::read_unaligned`]
4693 - [`*const T::read_volatile`]
4694 - [`*const T::read`]
4696 - [`*const T::wrapping_add`]
4697 - [`*const T::wrapping_sub`]
4699 - [`*mut T::copy_to_nonoverlapping`]
4700 - [`*mut T::copy_to`]
4701 - [`*mut T::read_unaligned`]
4702 - [`*mut T::read_volatile`]
4704 - [`*mut T::replace`]
4707 - [`*mut T::wrapping_add`]
4708 - [`*mut T::wrapping_sub`]
4709 - [`*mut T::write_bytes`]
4710 - [`*mut T::write_unaligned`]
4711 - [`*mut T::write_volatile`]
4714 - [`FromUtf8Error::as_bytes`]
4715 - [`LocalKey::try_with`]
4716 - [`Option::cloned`]
4717 - [`btree_map::Entry::and_modify`]
4718 - [`fs::read_to_string`]
4721 - [`hash_map::Entry::and_modify`]
4722 - [`iter::FusedIterator`]
4723 - [`ops::RangeInclusive`]
4724 - [`ops::RangeToInclusive`]
4726 - [`slice::rotate_left`]
4727 - [`slice::rotate_right`]
4728 - [`String::retain`]
4733 - [Cargo will now output path to custom commands when `-v` is
4734 passed with `--list`][cargo/5041]
4735 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4739 - [The second edition of "The Rust Programming Language" book is now recommended
4740 over the first.][48404]
4745 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4746 syntax is now invalid.
4748 use std::ops::Fn as dyn;
4749 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4751 - [The result of dereferences are no longer promoted to `'static`.][47408]
4755 const PAIR: &(i32, i32) = &(0, 1);
4756 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4759 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4760 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4762 - [Removed hoedown from rustdoc.][48274]
4763 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4765 [46882]: https://github.com/rust-lang/rust/pull/46882
4766 [47379]: https://github.com/rust-lang/rust/pull/47379
4767 [47408]: https://github.com/rust-lang/rust/pull/47408
4768 [47813]: https://github.com/rust-lang/rust/pull/47813
4769 [48056]: https://github.com/rust-lang/rust/pull/48056
4770 [48125]: https://github.com/rust-lang/rust/pull/48125
4771 [48235]: https://github.com/rust-lang/rust/pull/48235
4772 [48274]: https://github.com/rust-lang/rust/pull/48274
4773 [48281]: https://github.com/rust-lang/rust/pull/48281
4774 [48296]: https://github.com/rust-lang/rust/pull/48296
4775 [48326]: https://github.com/rust-lang/rust/pull/48326
4776 [48359]: https://github.com/rust-lang/rust/pull/48359
4777 [48404]: https://github.com/rust-lang/rust/pull/48404
4778 [48481]: https://github.com/rust-lang/rust/pull/48481
4779 [48516]: https://github.com/rust-lang/rust/pull/48516
4780 [48628]: https://github.com/rust-lang/rust/pull/48628
4781 [48629]: https://github.com/rust-lang/rust/pull/48629
4782 [48657]: https://github.com/rust-lang/rust/pull/48657
4783 [48735]: https://github.com/rust-lang/rust/pull/48735
4784 [48978]: https://github.com/rust-lang/rust/pull/48978
4785 [49101]: https://github.com/rust-lang/rust/pull/49101
4786 [49109]: https://github.com/rust-lang/rust/pull/49109
4787 [49162]: https://github.com/rust-lang/rust/pull/49162
4788 [49255]: https://github.com/rust-lang/rust/pull/49255
4789 [49299]: https://github.com/rust-lang/rust/pull/49299
4790 [49305]: https://github.com/rust-lang/rust/pull/49305
4791 [49394]: https://github.com/rust-lang/rust/pull/49394
4792 [49458]: https://github.com/rust-lang/rust/pull/49458
4793 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4794 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4795 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4796 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4797 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4798 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4799 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4800 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4801 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4802 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4803 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4804 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4805 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4806 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4807 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4808 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4809 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4810 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4811 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4812 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4813 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4814 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4815 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4816 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4817 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4818 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4819 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4820 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4821 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4822 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4823 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4824 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4825 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4826 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4827 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4828 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4829 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4830 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4831 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4832 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4833 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4834 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4837 Version 1.25.0 (2018-03-29)
4838 ==========================
4842 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4843 - [You can now use nested groups of imports.][47948]
4844 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4845 - [You can now have `|` at the start of a match arm.][47947] e.g.
4847 enum Foo { A, B, C }
4853 | Foo::B => println!("AB"),
4854 | Foo::C => println!("C"),
4861 - [Upgraded to LLVM 6.][47828]
4862 - [Added `-C lto=val` option.][47521]
4863 - [Added `i586-unknown-linux-musl` target][47282]
4867 - [Impl Send for `process::Command` on Unix.][47760]
4868 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4869 - [`UnsafeCell::into_inner` is now safe.][47204]
4870 - [Implement libstd for CloudABI.][47268]
4871 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4872 - [Implement `AsRef<Path>` for Component][46985]
4873 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4874 - [Moved `Duration` to libcore.][46666]
4878 - [`Location::column`]
4881 The following functions can now be used in a constant expression.
4882 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4883 - [`Duration::new`][47300]
4884 - [`Duration::from_secs`][47300]
4885 - [`Duration::from_millis`][47300]
4889 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4890 - [`cargo new` now defaults to creating a binary crate, instead of a
4891 library crate.][cargo/5029]
4895 - [Rust by example is now shipped with new releases][46196]
4899 - [Deprecated `net::lookup_host`.][47510]
4900 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4901 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4902 around indexing operations (see [#47349][47349]). This has been fixed (which also
4903 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4904 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4906 [33903]: https://github.com/rust-lang/rust/pull/33903
4907 [47947]: https://github.com/rust-lang/rust/pull/47947
4908 [47948]: https://github.com/rust-lang/rust/pull/47948
4909 [47760]: https://github.com/rust-lang/rust/pull/47760
4910 [47790]: https://github.com/rust-lang/rust/pull/47790
4911 [47828]: https://github.com/rust-lang/rust/pull/47828
4912 [47398]: https://github.com/rust-lang/rust/pull/47398
4913 [47510]: https://github.com/rust-lang/rust/pull/47510
4914 [47521]: https://github.com/rust-lang/rust/pull/47521
4915 [47204]: https://github.com/rust-lang/rust/pull/47204
4916 [47251]: https://github.com/rust-lang/rust/pull/47251
4917 [47268]: https://github.com/rust-lang/rust/pull/47268
4918 [47282]: https://github.com/rust-lang/rust/pull/47282
4919 [47300]: https://github.com/rust-lang/rust/pull/47300
4920 [47349]: https://github.com/rust-lang/rust/pull/47349
4921 [46931]: https://github.com/rust-lang/rust/pull/46931
4922 [46985]: https://github.com/rust-lang/rust/pull/46985
4923 [47006]: https://github.com/rust-lang/rust/pull/47006
4924 [46830]: https://github.com/rust-lang/rust/pull/46830
4925 [46095]: https://github.com/rust-lang/rust/pull/46095
4926 [46666]: https://github.com/rust-lang/rust/pull/46666
4927 [46196]: https://github.com/rust-lang/rust/pull/46196
4928 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4929 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4930 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4931 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4932 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4935 Version 1.24.1 (2018-03-01)
4936 ==========================
4938 - [Do not abort when unwinding through FFI][48251]
4939 - [Emit UTF-16 files for linker arguments on Windows][48318]
4940 - [Make the error index generator work again][48308]
4941 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4943 [48251]: https://github.com/rust-lang/rust/issues/48251
4944 [48308]: https://github.com/rust-lang/rust/issues/48308
4945 [48318]: https://github.com/rust-lang/rust/issues/48318
4946 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4949 Version 1.24.0 (2018-02-15)
4950 ==========================
4954 - [External `sysv64` ffi is now available.][46528]
4955 eg. `extern "sysv64" fn foo () {}`
4959 - [rustc now uses 16 codegen units by default for release builds.][46910]
4960 For the fastest builds, utilize `codegen-units=1`.
4961 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4962 - [Add `aarch64-unknown-openbsd` support][46760]
4966 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4967 improvement in performance in the majority of cases.
4968 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4969 with Windows.][46798]
4970 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4971 - [impl `From<bool>` for `AtomicBool`][46293]
4972 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4973 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4974 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4975 - [float::from_bits now just uses transmute.][46012] This provides
4976 some optimisations from LLVM.
4977 - [Copied `AsciiExt` methods onto `char`][46077]
4978 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4979 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4980 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4981 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4985 - [`RefCell::replace`]
4987 - [`atomic::spin_loop_hint`]
4989 The following functions can now be used in a constant expression.
4990 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4992 - [`AtomicBool::new`][46287]
4993 - [`AtomicUsize::new`][46287]
4994 - [`AtomicIsize::new`][46287]
4995 - [`AtomicPtr::new`][46287]
4996 - [`Cell::new`][46287]
4997 - [`{integer}::min_value`][46287]
4998 - [`{integer}::max_value`][46287]
4999 - [`mem::size_of`][46287]
5000 - [`mem::align_of`][46287]
5001 - [`ptr::null`][46287]
5002 - [`ptr::null_mut`][46287]
5003 - [`RefCell::new`][46287]
5004 - [`UnsafeCell::new`][46287]
5008 - [Added a `workspace.default-members` config that
5009 overrides implied `--all` in virtual workspaces.][cargo/4743]
5010 - [Enable incremental by default on development builds.][cargo/4817] Also added
5011 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5012 per-project or global basis respectively.
5019 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5020 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5021 in accordance with IETF RFC 4291 §2.2.
5022 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5023 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5024 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5025 - [Leading zeros in tuple struct members is now an error][47084]
5026 - [`column!()` macro is one-based instead of zero-based][46977]
5027 - [`fmt::Arguments` can no longer be shared across threads][45198]
5028 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5029 - [Cargo sets a different working directory for the compiler][cargo/4788]
5031 [44884]: https://github.com/rust-lang/rust/pull/44884
5032 [45198]: https://github.com/rust-lang/rust/pull/45198
5033 [45506]: https://github.com/rust-lang/rust/pull/45506
5034 [45990]: https://github.com/rust-lang/rust/pull/45990
5035 [46012]: https://github.com/rust-lang/rust/pull/46012
5036 [46077]: https://github.com/rust-lang/rust/pull/46077
5037 [46094]: https://github.com/rust-lang/rust/pull/46094
5038 [46284]: https://github.com/rust-lang/rust/pull/46284
5039 [46287]: https://github.com/rust-lang/rust/pull/46287
5040 [46293]: https://github.com/rust-lang/rust/pull/46293
5041 [46528]: https://github.com/rust-lang/rust/pull/46528
5042 [46671]: https://github.com/rust-lang/rust/pull/46671
5043 [46713]: https://github.com/rust-lang/rust/pull/46713
5044 [46735]: https://github.com/rust-lang/rust/pull/46735
5045 [46760]: https://github.com/rust-lang/rust/pull/46760
5046 [46798]: https://github.com/rust-lang/rust/pull/46798
5047 [46828]: https://github.com/rust-lang/rust/pull/46828
5048 [46831]: https://github.com/rust-lang/rust/pull/46831
5049 [46833]: https://github.com/rust-lang/rust/pull/46833
5050 [46910]: https://github.com/rust-lang/rust/pull/46910
5051 [46977]: https://github.com/rust-lang/rust/pull/46977
5052 [47018]: https://github.com/rust-lang/rust/pull/47018
5053 [47080]: https://github.com/rust-lang/rust/pull/47080
5054 [47084]: https://github.com/rust-lang/rust/pull/47084
5055 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5056 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5057 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5058 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5059 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5060 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5063 Version 1.23.0 (2018-01-04)
5064 ==========================
5068 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5069 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5070 Which should fix some confusing errors in some operations.
5074 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5075 undefined behavior.][45920]
5076 - [rustc now suggests renaming import if names clash.][45660]
5077 - [Display errors/warnings correctly when there are zero-width or
5078 wide characters.][45711]
5079 - [rustc now avoids unnecessary copies of arguments that are
5080 simple bindings][45380] This should improve memory usage on average by 5-10%.
5081 - [Updated musl used to build musl rustc to 1.1.17][45393]
5085 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5086 - [Implement Hash for raw pointers to unsized types][45483]
5087 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5088 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5089 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5090 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5091 and `<*mut T>::as_mut`][44932]
5092 - [Optimized `Thread::{park, unpark}` implementation][45524]
5093 - [Improved `SliceExt::binary_search` performance.][45333]
5094 - [impl `FromIterator<()>` for `()`][45379]
5095 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5103 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5104 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5105 - [Added unit test checking to `cargo check`][cargo/4592]
5106 - [Cargo now lets you install a specific version
5107 using `cargo install --version`][cargo/4637]
5111 - [Releases now ship with the Cargo book documentation.][45692]
5112 - [rustdoc now prints rendering warnings on every run.][45324]
5116 - [Changes have been made to type equality to make it more correct,
5117 in rare cases this could break some code.][45853] [Tracking issue for
5118 further information][45852]
5119 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5120 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5121 Android 9, the minimum supported version is Android 14.
5122 - [Bumped the minimum LLVM to 3.9][45326]
5124 [44042]: https://github.com/rust-lang/rust/pull/44042
5125 [44932]: https://github.com/rust-lang/rust/pull/44932
5126 [45267]: https://github.com/rust-lang/rust/pull/45267
5127 [45324]: https://github.com/rust-lang/rust/pull/45324
5128 [45326]: https://github.com/rust-lang/rust/pull/45326
5129 [45333]: https://github.com/rust-lang/rust/pull/45333
5130 [45379]: https://github.com/rust-lang/rust/pull/45379
5131 [45380]: https://github.com/rust-lang/rust/pull/45380
5132 [45393]: https://github.com/rust-lang/rust/pull/45393
5133 [45435]: https://github.com/rust-lang/rust/pull/45435
5134 [45483]: https://github.com/rust-lang/rust/pull/45483
5135 [45524]: https://github.com/rust-lang/rust/pull/45524
5136 [45571]: https://github.com/rust-lang/rust/pull/45571
5137 [45580]: https://github.com/rust-lang/rust/pull/45580
5138 [45610]: https://github.com/rust-lang/rust/pull/45610
5139 [45660]: https://github.com/rust-lang/rust/pull/45660
5140 [45692]: https://github.com/rust-lang/rust/pull/45692
5141 [45711]: https://github.com/rust-lang/rust/pull/45711
5142 [45772]: https://github.com/rust-lang/rust/pull/45772
5143 [45852]: https://github.com/rust-lang/rust/issues/45852
5144 [45853]: https://github.com/rust-lang/rust/pull/45853
5145 [45887]: https://github.com/rust-lang/rust/pull/45887
5146 [45920]: https://github.com/rust-lang/rust/pull/45920
5147 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5148 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5149 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5152 Version 1.22.1 (2017-11-22)
5153 ==========================
5155 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5157 [46183]: https://github.com/rust-lang/rust/pull/46183
5159 Version 1.22.0 (2017-11-22)
5160 ==========================
5164 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5165 - [Now accepts underscores in unicode escapes][43716]
5166 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5167 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5171 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5172 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5173 This should decrease compile times for debug builds.
5174 - [strict memory alignment now enabled on ARMv6][45094]
5175 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5179 - [Allow atomic operations up to 32 bits
5180 on `armv5te_unknown_linux_gnueabi`][44978]
5181 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5182 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5183 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5184 - [Properly detect overflow in `Instant += Duration`.][44220]
5185 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5186 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5187 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5194 - [Cargo will now build multi file examples in subdirectories of the `examples`
5195 folder that have a `main.rs` file.][cargo/4496]
5196 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5197 the old format will continue to work and can be updated with `cargo update`.
5198 - [Now supports vendoring git repositories][cargo/3992]
5202 - [`libbacktrace` is now available on Apple platforms.][44251]
5203 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5204 This now lets you specify that a given code example will fail to compile.
5208 - [The minimum Android version that rustc can build for has been bumped
5209 to `4.0` from `2.3`][45656]
5210 - [Allowing `T op= &T` for numeric types has broken some type
5211 inference cases][45480]
5214 [42526]: https://github.com/rust-lang/rust/pull/42526
5215 [43716]: https://github.com/rust-lang/rust/pull/43716
5216 [43949]: https://github.com/rust-lang/rust/pull/43949
5217 [44015]: https://github.com/rust-lang/rust/pull/44015
5218 [44220]: https://github.com/rust-lang/rust/pull/44220
5219 [44251]: https://github.com/rust-lang/rust/pull/44251
5220 [44287]: https://github.com/rust-lang/rust/pull/44287
5221 [44303]: https://github.com/rust-lang/rust/pull/44303
5222 [44456]: https://github.com/rust-lang/rust/pull/44456
5223 [44466]: https://github.com/rust-lang/rust/pull/44466
5224 [44895]: https://github.com/rust-lang/rust/pull/44895
5225 [44966]: https://github.com/rust-lang/rust/pull/44966
5226 [44978]: https://github.com/rust-lang/rust/pull/44978
5227 [45041]: https://github.com/rust-lang/rust/pull/45041
5228 [45064]: https://github.com/rust-lang/rust/pull/45064
5229 [45075]: https://github.com/rust-lang/rust/pull/45075
5230 [45094]: https://github.com/rust-lang/rust/pull/45094
5231 [45095]: https://github.com/rust-lang/rust/pull/45095
5232 [45480]: https://github.com/rust-lang/rust/issues/45480
5233 [45656]: https://github.com/rust-lang/rust/pull/45656
5234 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5235 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5236 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5243 Version 1.21.0 (2017-10-12)
5244 ==========================
5248 - [You can now use static references for literals.][43838]
5252 let x: &'static u32 = &0;
5255 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5258 my_macro!(Vec<i32>::new); // Always worked
5259 my_macro!(Vec::<i32>::new); // Now works
5264 - [Upgraded jemalloc to 4.5.0][43911]
5265 - [Enabled unwinding panics on Redox][43917]
5266 - [Now runs LLVM in parallel during translation phase.][43506]
5267 This should reduce peak memory usage.
5271 - [Generate builtin impls for `Clone` for all arrays and tuples that
5272 are `T: Clone`][43690]
5273 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5274 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5275 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5280 [`std::mem::discriminant`]
5284 - [You can now call `cargo install` with multiple package names][cargo/4216]
5285 - [Cargo commands inside a virtual workspace will now implicitly
5286 pass `--all`][cargo/4335]
5287 - [Added a `[patch]` section to `Cargo.toml` to handle
5288 prepublication dependencies][cargo/4123] [RFC 1969]
5289 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5290 like patterns][cargo/4270]
5291 - [Added the `--all-targets` option][cargo/4400]
5292 - [Using required dependencies as a feature is now deprecated and emits
5293 a warning][cargo/4364]
5298 - [Cargo docs are moving][43916]
5299 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5300 - [The rustdoc book is now available][43863]
5301 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5302 - [Added a preview of RLS has been made available through rustup][44204]
5303 Install with `rustup component add rls-preview`
5304 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5305 Previously only showed `std::os::unix`.
5309 - [Changes in method matching against higher-ranked types][43880] This may cause
5310 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5311 - [rustc's JSON error output's byte position start at top of file.][42973]
5312 Was previously relative to the rustc's internal `CodeMap` struct which
5313 required the unstable library `libsyntax` to correctly use.
5314 - [`unused_results` lint no longer ignores booleans][43728]
5316 [42565]: https://github.com/rust-lang/rust/pull/42565
5317 [42973]: https://github.com/rust-lang/rust/pull/42973
5318 [43348]: https://github.com/rust-lang/rust/pull/43348
5319 [43459]: https://github.com/rust-lang/rust/pull/43459
5320 [43506]: https://github.com/rust-lang/rust/pull/43506
5321 [43540]: https://github.com/rust-lang/rust/pull/43540
5322 [43690]: https://github.com/rust-lang/rust/pull/43690
5323 [43728]: https://github.com/rust-lang/rust/pull/43728
5324 [43838]: https://github.com/rust-lang/rust/pull/43838
5325 [43863]: https://github.com/rust-lang/rust/pull/43863
5326 [43880]: https://github.com/rust-lang/rust/pull/43880
5327 [43911]: https://github.com/rust-lang/rust/pull/43911
5328 [43916]: https://github.com/rust-lang/rust/pull/43916
5329 [43917]: https://github.com/rust-lang/rust/pull/43917
5330 [44204]: https://github.com/rust-lang/rust/pull/44204
5331 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5332 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5333 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5334 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5335 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5336 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5337 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5338 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5339 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5341 Version 1.20.0 (2017-08-31)
5342 ===========================
5346 - [Associated constants are now stabilised.][42809]
5347 - [A lot of macro bugs are now fixed.][42913]
5352 - [Struct fields are now properly coerced to the expected field type.][42807]
5353 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5354 `wasm32-experimental-emscripten` target.
5355 - [Changed some of the error messages to be more helpful.][42033]
5356 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5358 - [rustc now reports the total number of errors on compilation failure][43015]
5359 previously this was only the number of errors in the pass that failed.
5360 - [Expansion in rustc has been sped up 29x.][42533]
5361 - [added `msp430-none-elf` target.][43099]
5362 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5364 - [Fixes backtraces on Redox][43228]
5365 - [rustc now identifies different versions of same crate when absolute paths of
5366 different types match in an error message.][42826]
5372 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5373 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5375 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5376 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5377 - [Impl `Clone` for `DefaultHasher`.][42799]
5378 - [Impl `Sync` for `SyncSender`.][42397]
5379 - [Impl `FromStr` for `char`][42271]
5380 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5382 - [allow messages in the `unimplemented!()` macro.][42155]
5383 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5384 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5385 - [Upgrade to Unicode 10.0.0][42999]
5386 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5387 - [Skip the main thread's manual stack guard on Linux][43072]
5388 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5389 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5391 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5396 - [`CStr::into_c_string`]
5397 - [`CString::as_c_str`]
5398 - [`CString::into_boxed_c_str`]
5399 - [`Chain::get_mut`]
5400 - [`Chain::get_ref`]
5401 - [`Chain::into_inner`]
5402 - [`Option::get_or_insert_with`]
5403 - [`Option::get_or_insert`]
5404 - [`OsStr::into_os_string`]
5405 - [`OsString::into_boxed_os_str`]
5408 - [`Utf8Error::error_len`]
5409 - [`char::EscapeDebug`]
5410 - [`char::escape_debug`]
5411 - [`compile_error!`]
5412 - [`f32::from_bits`]
5414 - [`f64::from_bits`]
5416 - [`mem::ManuallyDrop`]
5417 - [`slice::sort_unstable_by_key`]
5418 - [`slice::sort_unstable_by`]
5419 - [`slice::sort_unstable`]
5420 - [`str::from_boxed_utf8_unchecked`]
5421 - [`str::as_bytes_mut`]
5422 - [`str::as_bytes_mut`]
5423 - [`str::from_utf8_mut`]
5424 - [`str::from_utf8_unchecked_mut`]
5426 - [`str::get_unchecked_mut`]
5427 - [`str::get_unchecked`]
5429 - [`str::into_boxed_bytes`]
5434 - [Cargo API token location moved from `~/.cargo/config` to
5435 `~/.cargo/credentials`.][cargo/3978]
5436 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5437 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5438 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5439 - [You can now specify version of a binary when installed through
5440 `cargo install` using `--vers`.][cargo/4229]
5441 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5442 failure.][cargo/4248]
5443 - [Changed the convention around which file is the crate root.][cargo/4259]
5448 - [Functions with `'static` in their return types will now not be as usable as
5449 if they were using lifetime parameters instead.][42417]
5450 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5451 takes the sign of NaN into account where previously didn't.][42430]
5453 [42033]: https://github.com/rust-lang/rust/pull/42033
5454 [42155]: https://github.com/rust-lang/rust/pull/42155
5455 [42271]: https://github.com/rust-lang/rust/pull/42271
5456 [42397]: https://github.com/rust-lang/rust/pull/42397
5457 [42417]: https://github.com/rust-lang/rust/pull/42417
5458 [42430]: https://github.com/rust-lang/rust/pull/42430
5459 [42431]: https://github.com/rust-lang/rust/pull/42431
5460 [42533]: https://github.com/rust-lang/rust/pull/42533
5461 [42571]: https://github.com/rust-lang/rust/pull/42571
5462 [42613]: https://github.com/rust-lang/rust/pull/42613
5463 [42799]: https://github.com/rust-lang/rust/pull/42799
5464 [42807]: https://github.com/rust-lang/rust/pull/42807
5465 [42809]: https://github.com/rust-lang/rust/pull/42809
5466 [42822]: https://github.com/rust-lang/rust/pull/42822
5467 [42826]: https://github.com/rust-lang/rust/pull/42826
5468 [42854]: https://github.com/rust-lang/rust/pull/42854
5469 [42913]: https://github.com/rust-lang/rust/pull/42913
5470 [42999]: https://github.com/rust-lang/rust/pull/42999
5471 [43011]: https://github.com/rust-lang/rust/pull/43011
5472 [43015]: https://github.com/rust-lang/rust/pull/43015
5473 [43072]: https://github.com/rust-lang/rust/pull/43072
5474 [43077]: https://github.com/rust-lang/rust/pull/43077
5475 [43097]: https://github.com/rust-lang/rust/pull/43097
5476 [43099]: https://github.com/rust-lang/rust/pull/43099
5477 [43170]: https://github.com/rust-lang/rust/pull/43170
5478 [43178]: https://github.com/rust-lang/rust/pull/43178
5479 [43185]: https://github.com/rust-lang/rust/pull/43185
5480 [43228]: https://github.com/rust-lang/rust/pull/43228
5481 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5482 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5483 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5484 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5485 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5486 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5487 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5488 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5489 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5490 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5491 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5492 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5493 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5494 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5495 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5496 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5497 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5498 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5499 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5500 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5501 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5502 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5503 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5504 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5505 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5506 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5507 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5508 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5509 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5510 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5511 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5512 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5513 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5514 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5515 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5516 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5517 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5518 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5521 Version 1.19.0 (2017-07-20)
5522 ===========================
5527 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5528 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5529 - [Macro recursion limit increased to 1024 from 64.][41676]
5530 - [Added lint for detecting unused macros.][41907]
5531 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5532 For example: `let x = loop { break 7; };`
5533 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5534 contain `Copy` types and cannot have a `Drop` implementation.
5535 Example: `union Foo { bar: u8, baz: usize }`
5536 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5537 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5542 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5543 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5544 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5545 you should use `--target armv7-linux-androideabi`.
5546 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5547 - [Minor optimisation of string operations.][42037]
5548 - [Compiler error message is now `aborting due to previous error(s)` instead of
5549 `aborting due to N previous errors`][42150] This was previously inaccurate and
5550 would only count certain kinds of errors.
5551 - [The compiler now supports Visual Studio 2017][42225]
5552 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5553 - [Added a lot][42264] of [new error codes][42302]
5554 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5555 libraries with C Run-time Libraries(CRT) to be statically linked.
5556 - [Fixed various ARM codegen bugs][42740]
5561 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5562 `Extend<Cow<'a, str>>`][41449]
5563 - [`Vec` now implements `From<&mut [T]>`][41530]
5564 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5565 - [`SplitWhitespace` now implements `Clone`][41659]
5566 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5568 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5569 macros, but for printing to stderr.
5574 - [`OsString::shrink_to_fit`]
5577 - [`thread::ThreadId`]
5582 - [Build scripts can now add environment variables to the environment
5583 the crate is being compiled in.
5584 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5585 - [Subcommands now replace the current process rather than spawning a new
5586 child process][cargo/3970]
5587 - [Workspace members can now accept glob file patterns][cargo/3979]
5588 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5589 the members in a given workspace.][cargo/3988]
5590 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5591 - [Target directory path is now in the cargo metadata][cargo/4022]
5592 - [Cargo no longer checks out a local working directory for the
5593 crates.io index][cargo/4026] This should provide smaller file size for the
5594 registry, and improve cloning times, especially on Windows machines.
5595 - [Added an `--exclude` option for excluding certain packages when using the
5596 `--all` option][cargo/4031]
5597 - [Cargo will now automatically retry when receiving a 5xx error
5598 from crates.io][cargo/4032]
5599 - [The `--features` option now accepts multiple comma or space
5600 delimited values.][cargo/4084]
5601 - [Added support for custom target specific runners][cargo/3954]
5606 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5608 - [Rust will now release XZ compressed packages][rust-installer/57]
5609 - [rustup will now prefer to download rust packages with
5610 XZ compression][rustup/1100] over GZip packages.
5611 - [Added the ability to escape `#` in rust documentation][41785] By adding
5612 additional `#`'s ie. `##` is now `#`
5617 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5618 - [`-Z` flags are now no longer allowed to be used on the stable
5619 compiler.][41751] This has been a warning for a year previous to this.
5620 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5621 longer works][42844]. Users should migrate to the built-in `check`
5622 command, which has been available since 1.16.
5623 - [Ending a float literal with `._` is now a hard error.
5624 Example: `42._` .][41946]
5625 - [Any use of a private `extern crate` outside of its module is now a
5626 hard error.][36886] This was previously a warning.
5627 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5628 relative while the `::` prefix makes a path absolute, but was ignored and the
5629 path was relative regardless.
5630 - [Floating point constants in match patterns is now a hard error][36890]
5631 This was previously a warning.
5632 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5633 match patterns is now a hard error][36891] This was previously a warning.
5634 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5636 - [From the pound escape, lines consisting of multiple `#`s are
5638 - [It is an error to re-export private enum variants][42460]. This is
5639 known to break a number of crates that depend on an older version of
5641 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5642 to use it to find the linker, and the build will fail where it did
5643 not previously][42607]
5645 [36886]: https://github.com/rust-lang/rust/issues/36886
5646 [36888]: https://github.com/rust-lang/rust/issues/36888
5647 [36890]: https://github.com/rust-lang/rust/issues/36890
5648 [36891]: https://github.com/rust-lang/rust/issues/36891
5649 [36892]: https://github.com/rust-lang/rust/issues/36892
5650 [37406]: https://github.com/rust-lang/rust/issues/37406
5651 [39983]: https://github.com/rust-lang/rust/pull/39983
5652 [41145]: https://github.com/rust-lang/rust/pull/41145
5653 [41192]: https://github.com/rust-lang/rust/pull/41192
5654 [41258]: https://github.com/rust-lang/rust/pull/41258
5655 [41370]: https://github.com/rust-lang/rust/pull/41370
5656 [41449]: https://github.com/rust-lang/rust/pull/41449
5657 [41530]: https://github.com/rust-lang/rust/pull/41530
5658 [41624]: https://github.com/rust-lang/rust/pull/41624
5659 [41656]: https://github.com/rust-lang/rust/pull/41656
5660 [41659]: https://github.com/rust-lang/rust/pull/41659
5661 [41676]: https://github.com/rust-lang/rust/pull/41676
5662 [41751]: https://github.com/rust-lang/rust/pull/41751
5663 [41764]: https://github.com/rust-lang/rust/pull/41764
5664 [41785]: https://github.com/rust-lang/rust/pull/41785
5665 [41873]: https://github.com/rust-lang/rust/pull/41873
5666 [41907]: https://github.com/rust-lang/rust/pull/41907
5667 [41946]: https://github.com/rust-lang/rust/pull/41946
5668 [42016]: https://github.com/rust-lang/rust/pull/42016
5669 [42037]: https://github.com/rust-lang/rust/pull/42037
5670 [42068]: https://github.com/rust-lang/rust/pull/42068
5671 [42150]: https://github.com/rust-lang/rust/pull/42150
5672 [42162]: https://github.com/rust-lang/rust/pull/42162
5673 [42225]: https://github.com/rust-lang/rust/pull/42225
5674 [42264]: https://github.com/rust-lang/rust/pull/42264
5675 [42302]: https://github.com/rust-lang/rust/pull/42302
5676 [42460]: https://github.com/rust-lang/rust/issues/42460
5677 [42607]: https://github.com/rust-lang/rust/issues/42607
5678 [42740]: https://github.com/rust-lang/rust/pull/42740
5679 [42844]: https://github.com/rust-lang/rust/issues/42844
5680 [42948]: https://github.com/rust-lang/rust/pull/42948
5681 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5682 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5683 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5684 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5685 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5686 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5687 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5688 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5689 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5690 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5691 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5692 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5693 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5694 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5695 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5696 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5697 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5698 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5699 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5700 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5701 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5702 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5705 Version 1.18.0 (2017-06-08)
5706 ===========================
5711 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5712 make the item visible to just that module tree. Also accepts the keyword
5713 `crate` to make something public to the whole crate but not users of the
5714 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5715 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5716 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5717 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5718 types like `Write + Send`, trailing `+` are now supported in trait objects,
5719 and better error reporting for trait objects starting with `?Sized`.
5720 - [0e+10 is now a valid floating point literal][40589]
5721 - [Now warns if you bind a lifetime parameter to 'static][40734]
5722 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5723 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5724 representation in some cases.][40377]
5729 - [rustc can now emit mir with `--emit mir`][39891]
5730 - [Improved LLVM IR for trivial functions][40367]
5731 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5732 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5733 opportunities found through profiling
5734 - [Improved backtrace formatting when panicking][38165]
5739 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5740 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5741 iteration or reallocation.
5742 - [Simplified HashMap Bucket interface][40561] provides performance
5743 improvements for iterating and cloning.
5744 - [Specialize Vec::from_elem to use calloc][40409]
5745 - [Fixed Race condition in fs::create_dir_all][39799]
5746 - [No longer caching stdio on Windows][40516]
5747 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5748 2.50%~ faster and in one case now 12.50% faster.
5749 - [Optimized `AtomicBool::fetch_nand`][41143]
5754 - [`Child::try_wait`]
5755 - [`HashMap::retain`]
5756 - [`HashSet::retain`]
5758 - [`TcpStream::peek`]
5759 - [`UdpSocket::peek`]
5760 - [`UdpSocket::peek_from`]
5765 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5766 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5767 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5768 - [Added Android build support][cargo/3885]
5769 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5770 of a certain type, for example `cargo build --bins` will build all
5772 - [Added support for haiku][cargo/3952]
5777 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5778 - [Rust now uses the official cross compiler for NetBSD][40612]
5779 - [rustdoc now accepts `#` at the start of files][40828]
5780 - [Fixed jemalloc support for musl][41168]
5785 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5786 always placed after the sign if it exists and before the digits. With the `#`
5787 flag the zeroes are placed after the prefix and before the digits.
5788 - [Due to the struct field optimisation][40377], using `transmute` on structs
5789 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5790 always been undefined behavior, but is now more likely to break in practice.
5791 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5792 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5793 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5794 - [Overlapping inherent `impl`s are now a hard error][40728]
5795 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5796 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5797 `out.asm` and `out.ll` instead of only one of the filetypes.
5798 - [ calling a function that returns `Self` will no longer work][41805] when
5799 the size of `Self` cannot be statically determined.
5800 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5801 this has caused a few regressions namely:
5803 - Changed the link order of local static/dynamic libraries (respecting the
5804 order on given rather than having the compiler reorder).
5805 - Changed how MinGW is linked, native code linked to dynamic libraries
5806 may require manually linking to the gcc support library (for the native
5809 [38165]: https://github.com/rust-lang/rust/pull/38165
5810 [39799]: https://github.com/rust-lang/rust/pull/39799
5811 [39891]: https://github.com/rust-lang/rust/pull/39891
5812 [40043]: https://github.com/rust-lang/rust/pull/40043
5813 [40241]: https://github.com/rust-lang/rust/pull/40241
5814 [40338]: https://github.com/rust-lang/rust/pull/40338
5815 [40367]: https://github.com/rust-lang/rust/pull/40367
5816 [40377]: https://github.com/rust-lang/rust/pull/40377
5817 [40409]: https://github.com/rust-lang/rust/pull/40409
5818 [40516]: https://github.com/rust-lang/rust/pull/40516
5819 [40556]: https://github.com/rust-lang/rust/pull/40556
5820 [40561]: https://github.com/rust-lang/rust/pull/40561
5821 [40589]: https://github.com/rust-lang/rust/pull/40589
5822 [40612]: https://github.com/rust-lang/rust/pull/40612
5823 [40723]: https://github.com/rust-lang/rust/pull/40723
5824 [40728]: https://github.com/rust-lang/rust/pull/40728
5825 [40731]: https://github.com/rust-lang/rust/pull/40731
5826 [40734]: https://github.com/rust-lang/rust/pull/40734
5827 [40805]: https://github.com/rust-lang/rust/pull/40805
5828 [40807]: https://github.com/rust-lang/rust/pull/40807
5829 [40828]: https://github.com/rust-lang/rust/pull/40828
5830 [40870]: https://github.com/rust-lang/rust/pull/40870
5831 [41085]: https://github.com/rust-lang/rust/pull/41085
5832 [41143]: https://github.com/rust-lang/rust/pull/41143
5833 [41168]: https://github.com/rust-lang/rust/pull/41168
5834 [41270]: https://github.com/rust-lang/rust/issues/41270
5835 [41469]: https://github.com/rust-lang/rust/pull/41469
5836 [41805]: https://github.com/rust-lang/rust/issues/41805
5837 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5838 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5839 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5840 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5841 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5842 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5843 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5844 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5845 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5846 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5847 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5848 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5849 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5850 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5853 Version 1.17.0 (2017-04-27)
5854 ===========================
5859 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5860 * [Fields of structs may be initialized without duplicating the field/variable
5861 names][39761]. [RFC 1682]
5862 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5863 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5864 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5865 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5866 `'b`. Soundness fix.
5867 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5868 * [Static variables may contain references to other statics][40027]
5873 * [Exit quickly on only `--emit dep-info`][40336]
5874 * [Make `-C relocation-model` more correctly determine whether the linker
5875 creates a position-independent executable][40245]
5876 * [Add `-C overflow-checks` to directly control whether integer overflow
5878 * [The rustc type checker now checks items on demand instead of in a single
5879 in-order pass][40008]. This is mostly an internal refactoring in support of
5880 future work, including incremental type checking, but also resolves [RFC
5881 1647], allowing `Self` to appear in `impl` `where` clauses.
5882 * [Optimize vtable loads][39995]
5883 * [Turn off vectorization for Emscripten targets][39990]
5884 * [Provide suggestions for unknown macros imported with `use`][39953]
5885 * [Fix ICEs in path resolution][39939]
5886 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5887 * [Add clearer error message using `&str + &str`][39116]
5898 * [`Ordering::then`]
5899 * [`Ordering::then_with`]
5900 * [`BTreeMap::range`]
5901 * [`BTreeMap::range_mut`]
5902 * [`collections::Bound`]
5903 * [`process::abort`]
5904 * [`ptr::read_unaligned`]
5905 * [`ptr::write_unaligned`]
5906 * [`Result::expect_err`]
5909 * [`Cell::into_inner`]
5915 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5916 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5917 * [`String` implements `FromIterator<&char>`][40028]
5918 * `Box` [implements][40009] a number of new conversions:
5919 `From<Box<str>> for String`,
5920 `From<Box<[T]>> for Vec<T>`,
5921 `From<Box<CStr>> for CString`,
5922 `From<Box<OsStr>> for OsString`,
5923 `From<Box<Path>> for PathBuf`,
5924 `Into<Box<str>> for String`,
5925 `Into<Box<[T]>> for Vec<T>`,
5926 `Into<Box<CStr>> for CString`,
5927 `Into<Box<OsStr>> for OsString`,
5928 `Into<Box<Path>> for PathBuf`,
5929 `Default for Box<str>`,
5930 `Default for Box<CStr>`,
5931 `Default for Box<OsStr>`,
5932 `From<&CStr> for Box<CStr>`,
5933 `From<&OsStr> for Box<OsStr>`,
5934 `From<&Path> for Box<Path>`
5935 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5936 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5937 * [Slightly optimize `slice::sort`][39538]
5938 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5939 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5940 `Box<str>` implements `From<&str>`][39438]
5941 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5942 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5943 * [`format!` estimates the needed capacity before writing a string][39356]
5944 * [Support unprivileged symlink creation in Windows][38921]
5945 * [`PathBuf` implements `Default`][38764]
5946 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5947 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5948 and poor hash functions.
5953 * [Add `cargo check --all`][cargo/3731]
5954 * [Add an option to ignore SSL revocation checking][cargo/3699]
5955 * [Add `cargo run --package`][cargo/3691]
5956 * [Add `required_features`][cargo/3667]
5957 * [Assume `build.rs` is a build script][cargo/3664]
5958 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5963 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5965 * [The "Unstable Book" documents nightly-only features][ubook]
5966 * [Improve the style of the sidebar in rustdoc output][40265]
5967 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5968 * [Fix MSP430 breakage due to `i128`][40257]
5969 * [Preliminary Solaris/SPARCv9 support][39903]
5970 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5971 run without installing the MSVC runtime.
5972 * [`rustdoc --test` includes file names in test names][39788]
5973 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5974 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5975 * [Initial support for `aarch64-unknown-freebsd`][39491]
5976 * [Initial support for `i686-unknown-netbsd`][39426]
5977 * [This release no longer includes the old makefile build system][39431]. Rust
5978 is built with a custom build system, written in Rust, and with Cargo.
5979 * [Add Debug implementations for libcollection structs][39002]
5980 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5981 * [`--test-threads=0` produces an error][38945]
5982 * [`rustup` installs documentation by default][40526]
5983 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5984 WinDbg and Visual Studio to improve the debugging experience.
5989 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5990 workaround, either use MSVC 2015 or run vcvars.bat.
5991 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5992 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5993 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5995 * [`format!` and `Display::to_string` panic if an underlying formatting
5996 implementation returns an error][40117]. Previously the error was silently
5997 ignored. It is incorrect for `write_fmt` to return an error when writing
5999 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6000 crates were marked stable and could be accessed from the stable toolchain.
6001 * [Rust git source no longer includes vendored crates][39728]. Those that need
6002 to build with vendored crates should build from release tarballs.
6003 * [Fix inert attributes from `proc_macro_derives`][39572]
6004 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6005 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6007 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6008 existing code generally ignores the type of dead-code unless a type-hint is
6009 provided; this can cause surprising inference interactions particularly around
6010 defaulting. The new code uniformly ignores the result type of dead-code.
6011 * [Tuple-struct constructors with private fields are no longer visible][38932]
6012 * [Lifetime parameters that do not appear in the arguments are now considered
6013 early-bound][38897], resolving a soundness bug (#[32330]). The
6014 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6016 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6017 * [Make transmuting from fn item types to pointer-sized types a hard
6020 [27787]: https://github.com/rust-lang/rust/issues/27787
6021 [32330]: https://github.com/rust-lang/rust/issues/32330
6022 [34198]: https://github.com/rust-lang/rust/pull/34198
6023 [38161]: https://github.com/rust-lang/rust/pull/38161
6024 [38368]: https://github.com/rust-lang/rust/pull/38368
6025 [38584]: https://github.com/rust-lang/rust/issues/38584
6026 [38661]: https://github.com/rust-lang/rust/pull/38661
6027 [38764]: https://github.com/rust-lang/rust/pull/38764
6028 [38864]: https://github.com/rust-lang/rust/issues/38864
6029 [38897]: https://github.com/rust-lang/rust/pull/38897
6030 [38921]: https://github.com/rust-lang/rust/pull/38921
6031 [38932]: https://github.com/rust-lang/rust/pull/38932
6032 [38945]: https://github.com/rust-lang/rust/pull/38945
6033 [38981]: https://github.com/rust-lang/rust/pull/38981
6034 [39002]: https://github.com/rust-lang/rust/pull/39002
6035 [39116]: https://github.com/rust-lang/rust/pull/39116
6036 [39193]: https://github.com/rust-lang/rust/pull/39193
6037 [39265]: https://github.com/rust-lang/rust/pull/39265
6038 [39356]: https://github.com/rust-lang/rust/pull/39356
6039 [39372]: https://github.com/rust-lang/rust/pull/39372
6040 [39426]: https://github.com/rust-lang/rust/pull/39426
6041 [39431]: https://github.com/rust-lang/rust/pull/39431
6042 [39438]: https://github.com/rust-lang/rust/pull/39438
6043 [39440]: https://github.com/rust-lang/rust/pull/39440
6044 [39485]: https://github.com/rust-lang/rust/pull/39485
6045 [39491]: https://github.com/rust-lang/rust/pull/39491
6046 [39518]: https://github.com/rust-lang/rust/pull/39518
6047 [39538]: https://github.com/rust-lang/rust/pull/39538
6048 [39572]: https://github.com/rust-lang/rust/pull/39572
6049 [39633]: https://github.com/rust-lang/rust/pull/39633
6050 [39642]: https://github.com/rust-lang/rust/pull/39642
6051 [39728]: https://github.com/rust-lang/rust/pull/39728
6052 [39761]: https://github.com/rust-lang/rust/pull/39761
6053 [39788]: https://github.com/rust-lang/rust/pull/39788
6054 [39793]: https://github.com/rust-lang/rust/pull/39793
6055 [39837]: https://github.com/rust-lang/rust/pull/39837
6056 [39843]: https://github.com/rust-lang/rust/pull/39843
6057 [39851]: https://github.com/rust-lang/rust/pull/39851
6058 [39903]: https://github.com/rust-lang/rust/pull/39903
6059 [39939]: https://github.com/rust-lang/rust/pull/39939
6060 [39953]: https://github.com/rust-lang/rust/pull/39953
6061 [39960]: https://github.com/rust-lang/rust/pull/39960
6062 [39990]: https://github.com/rust-lang/rust/pull/39990
6063 [39995]: https://github.com/rust-lang/rust/pull/39995
6064 [40008]: https://github.com/rust-lang/rust/pull/40008
6065 [40009]: https://github.com/rust-lang/rust/pull/40009
6066 [40027]: https://github.com/rust-lang/rust/pull/40027
6067 [40028]: https://github.com/rust-lang/rust/pull/40028
6068 [40037]: https://github.com/rust-lang/rust/pull/40037
6069 [40117]: https://github.com/rust-lang/rust/pull/40117
6070 [40166]: https://github.com/rust-lang/rust/pull/40166
6071 [40245]: https://github.com/rust-lang/rust/pull/40245
6072 [40257]: https://github.com/rust-lang/rust/pull/40257
6073 [40261]: https://github.com/rust-lang/rust/pull/40261
6074 [40265]: https://github.com/rust-lang/rust/pull/40265
6075 [40319]: https://github.com/rust-lang/rust/pull/40319
6076 [40336]: https://github.com/rust-lang/rust/pull/40336
6077 [40526]: https://github.com/rust-lang/rust/pull/40526
6078 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6079 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6080 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6081 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6082 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6083 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6084 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6085 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6086 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6087 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6088 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6089 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6090 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6091 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6092 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6093 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6094 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6095 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6096 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6097 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6098 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6099 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6100 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6101 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6102 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6103 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6104 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6105 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6106 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6107 [ubook]: https://doc.rust-lang.org/unstable-book/
6110 Version 1.16.0 (2017-03-16)
6111 ===========================
6116 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6117 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6118 match patterns][38069]
6119 * [Clean up semantics of `self` in an import list][38313]
6120 * [`Self` may appear in `impl` headers][38920]
6121 * [`Self` may appear in struct expressions][39282]
6126 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6127 a `.rmeta` file containing only crate metadata][38571]. This can be
6128 used by tools like the Rust Language Service to perform
6129 metadata-only builds.
6130 * [Levenshtein based typo suggestions now work in most places, while
6131 previously they worked only for fields and sometimes for local
6132 variables][38927]. Together with the overhaul of "no
6133 resolution"/"unexpected resolution" errors (#[38154]) they result in
6134 large and systematic improvement in resolution diagnostics.
6135 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6137 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6138 * [`rustc` no longer attempts to provide "consider using an explicit
6139 lifetime" suggestions][37057]. They were inaccurate.
6144 * [`VecDeque::truncate`]
6145 * [`VecDeque::resize`]
6146 * [`String::insert_str`]
6147 * [`Duration::checked_add`]
6148 * [`Duration::checked_sub`]
6149 * [`Duration::checked_div`]
6150 * [`Duration::checked_mul`]
6153 * [`SocketAddr::is_ipv4`]
6154 * [`SocketAddr::is_ipv6`]
6155 * [`IpAddr::is_ipv4`]
6156 * [`IpAddr::is_ipv6`]
6158 * [`Vec::dedup_by_key`]
6159 * [`Result::unwrap_or_default`]
6160 * [`<*const T>::wrapping_offset`]
6161 * [`<*mut T>::wrapping_offset`]
6162 * `CommandExt::creation_flags`
6163 * [`File::set_permissions`]
6164 * [`String::split_off`]
6169 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6170 their argument by `Borrow` parameter][37761]
6171 * [All public types in std implement `Debug`][38006]
6172 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6173 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6174 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6176 * [std: Fix partial writes in `LineWriter`][38062]
6177 * [std: Clamp max read/write sizes on Unix][38622]
6178 * [Use more specific panic message for `&str` slicing errors][38066]
6179 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6180 functionality cannot be achieved in std currently.
6181 * [`writeln!`, like `println!`, now accepts a form with no string
6182 or formatting arguments, to just print a newline][38469]
6183 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6184 * [Reduce the size of static data in `std_unicode::tables`][38781]
6185 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6186 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6188 * [`Duration` implements `Sum`][38712]
6189 * [`String` implements `ToSocketAddrs`][39048]
6194 * [The `cargo check` command does a type check of a project without
6195 building it][cargo/3296]
6196 * [crates.io will display CI badges from Travis and AppVeyor, if
6197 specified in Cargo.toml][cargo/3546]
6198 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6199 * [Compilation profiles accept integer values for `debug`, in addition
6200 to `true` and `false`. These are passed to `rustc` as the value to
6201 `-C debuginfo`][cargo/3534]
6202 * [Implement `cargo --version --verbose`][cargo/3604]
6203 * [All builds now output 'dep-info' build dependencies compatible with
6204 make and ninja][cargo/3557]
6205 * [Build all workspace members with `build --all`][cargo/3511]
6206 * [Document all workspace members with `doc --all`][cargo/3515]
6207 * [Path deps outside workspace are not members][cargo/3443]
6212 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6213 the path to the Rust implementation][38589]
6214 * [The `armv7-linux-androideabi` target no longer enables NEON
6215 extensions, per Google's ABI guide][38413]
6216 * [The stock standard library can be compiled for Redox OS][38401]
6217 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6219 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6221 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6226 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6227 match patterns][38069]
6228 * In this release, references to uninhabited types can not be
6229 pattern-matched. This was accidentally allowed in 1.15.
6230 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6231 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6233 * [Clean up semantics of `self` in an import list][38313]
6234 * Reimplemented lifetime elision. This change was almost entirely compatible
6235 with existing code, but it did close a number of small bugs and loopholes,
6236 as well as being more accepting in some other [cases][41105].
6238 [37057]: https://github.com/rust-lang/rust/pull/37057
6239 [37761]: https://github.com/rust-lang/rust/pull/37761
6240 [38006]: https://github.com/rust-lang/rust/pull/38006
6241 [38051]: https://github.com/rust-lang/rust/pull/38051
6242 [38062]: https://github.com/rust-lang/rust/pull/38062
6243 [38622]: https://github.com/rust-lang/rust/pull/38622
6244 [38066]: https://github.com/rust-lang/rust/pull/38066
6245 [38069]: https://github.com/rust-lang/rust/pull/38069
6246 [38131]: https://github.com/rust-lang/rust/pull/38131
6247 [38154]: https://github.com/rust-lang/rust/pull/38154
6248 [38274]: https://github.com/rust-lang/rust/pull/38274
6249 [38304]: https://github.com/rust-lang/rust/pull/38304
6250 [38313]: https://github.com/rust-lang/rust/pull/38313
6251 [38327]: https://github.com/rust-lang/rust/pull/38327
6252 [38401]: https://github.com/rust-lang/rust/pull/38401
6253 [38413]: https://github.com/rust-lang/rust/pull/38413
6254 [38469]: https://github.com/rust-lang/rust/pull/38469
6255 [38559]: https://github.com/rust-lang/rust/pull/38559
6256 [38571]: https://github.com/rust-lang/rust/pull/38571
6257 [38580]: https://github.com/rust-lang/rust/pull/38580
6258 [38589]: https://github.com/rust-lang/rust/pull/38589
6259 [38670]: https://github.com/rust-lang/rust/pull/38670
6260 [38712]: https://github.com/rust-lang/rust/pull/38712
6261 [38726]: https://github.com/rust-lang/rust/pull/38726
6262 [38781]: https://github.com/rust-lang/rust/pull/38781
6263 [38798]: https://github.com/rust-lang/rust/pull/38798
6264 [38909]: https://github.com/rust-lang/rust/pull/38909
6265 [38920]: https://github.com/rust-lang/rust/pull/38920
6266 [38927]: https://github.com/rust-lang/rust/pull/38927
6267 [39048]: https://github.com/rust-lang/rust/pull/39048
6268 [39282]: https://github.com/rust-lang/rust/pull/39282
6269 [39379]: https://github.com/rust-lang/rust/pull/39379
6270 [41105]: https://github.com/rust-lang/rust/issues/41105
6271 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6272 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6273 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6274 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6275 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6276 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6277 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6278 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6279 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6280 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6281 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6282 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6283 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6284 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6285 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6286 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6287 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6288 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6289 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6290 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6291 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6292 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6293 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6294 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6295 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6296 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6297 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6298 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6299 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6302 Version 1.15.1 (2017-02-09)
6303 ===========================
6305 * [Fix IntoIter::as_mut_slice's signature][39466]
6306 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6308 [39466]: https://github.com/rust-lang/rust/pull/39466
6309 [39523]: https://github.com/rust-lang/rust/pull/39523
6312 Version 1.15.0 (2017-02-02)
6313 ===========================
6318 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6319 stable. This allows popular code-generating crates like Serde and Diesel to
6320 work ergonomically. [RFC 1681].
6321 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6322 with curly braces][36868]. Part of [RFC 1506].
6323 * [A number of minor changes to name resolution have been activated][37127].
6324 They add up to more consistent semantics, allowing for future evolution of
6325 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6326 details of what is different. The breaking changes here have been transitioned
6327 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6328 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6330 * [`?Sized` can be used in `where` clauses][37791]
6331 * [There is now a limit on the size of monomorphized types and it can be
6332 modified with the `#![type_size_limit]` crate attribute, similarly to
6333 the `#![recursion_limit]` attribute][37789]
6338 * [On Windows, the compiler will apply dllimport attributes when linking to
6339 extern functions][37973]. Additional attributes and flags can control which
6340 library kind is linked and its name. [RFC 1717].
6341 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6342 * [The `--test` flag works with procedural macro crates][38107]
6343 * [Fix `extern "aapcs" fn` ABI][37814]
6344 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6345 * [The `format!` expander recognizes incorrect `printf` and shell-style
6346 formatting directives and suggests the correct format][37613].
6347 * [Only report one error for all unused imports in an import list][37456]
6349 Compiler Performance
6350 --------------------
6352 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6353 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6354 * [Don't clone in `UnificationTable::probe`][37848]
6355 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6356 * [Use small vectors in type walker][37760]
6357 * [Macro expansion performance was improved][37701]
6358 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6359 * [Replace FNV with a faster hash function][37229]
6364 * [`std::iter::Iterator::min_by`]
6365 * [`std::iter::Iterator::max_by`]
6366 * [`std::os::*::fs::FileExt`]
6367 * [`std::sync::atomic::Atomic*::get_mut`]
6368 * [`std::sync::atomic::Atomic*::into_inner`]
6369 * [`std::vec::IntoIter::as_slice`]
6370 * [`std::vec::IntoIter::as_mut_slice`]
6371 * [`std::sync::mpsc::Receiver::try_iter`]
6372 * [`std::os::unix::process::CommandExt::before_exec`]
6373 * [`std::rc::Rc::strong_count`]
6374 * [`std::rc::Rc::weak_count`]
6375 * [`std::sync::Arc::strong_count`]
6376 * [`std::sync::Arc::weak_count`]
6377 * [`std::char::encode_utf8`]
6378 * [`std::char::encode_utf16`]
6379 * [`std::cell::Ref::clone`]
6380 * [`std::io::Take::into_inner`]
6385 * [The standard sorting algorithm has been rewritten for dramatic performance
6386 improvements][38192]. It is a hybrid merge sort, drawing influences from
6387 Timsort. Previously it was a naive merge sort.
6388 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6389 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6391 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6392 and `char_indices().last()`][37882]
6393 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6394 * [Chinese characters display correctly in `fmt::Debug`][37855]
6395 * [Derive `Default` for `Duration`][37699]
6396 * [Support creation of anonymous pipes on WinXP/2k][37677]
6397 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6398 * [Don't pass overlapped handles to processes][38835]
6403 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6404 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6405 should instead check the variable at runtime with `std::env`. That the value
6406 was set at build time was a bug, and incorrect when cross-compiling. This
6407 change is known to cause breakage.
6408 * [Add `--all` flag to `cargo test`][cargo/3221]
6409 * [Compile statically against the MSVC CRT][cargo/3363]
6410 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6411 * [Link OpenSSL statically on OSX][cargo/3311]
6412 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6413 * [Test for bad path overrides with summaries][cargo/3336]
6414 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6415 * [Fix retrying crate downloads for network errors][cargo/3348]
6416 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6417 * [Emit more info on --message-format=json][cargo/3319]
6418 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6419 * [Don't ignore errors in workspace manifest][cargo/3409]
6420 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6425 * [Test runners (binaries built with `--test`) now support a `--list` argument
6426 that lists the tests it contains][38185]
6427 * [Test runners now support a `--exact` argument that makes the test filter
6428 match exactly, instead of matching only a substring of the test name][38181]
6429 * [rustdoc supports a `--playground-url` flag][37763]
6430 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6435 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6436 continue to be used in this release by passing `--disable-rustbuild` to the
6437 configure script, but they will be deleted soon. Note that the new build
6438 system uses a different on-disk layout that will likely affect any scripts
6440 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6442 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6443 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6449 * [A number of minor changes to name resolution have been activated][37127].
6450 They add up to more consistent semantics, allowing for future evolution of
6451 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6452 details of what is different. The breaking changes here have been transitioned
6453 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6454 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6455 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6456 should instead check the variable at runtime with `std::env`. That the value
6457 was set at build time was a bug, and incorrect when cross-compiling. This
6458 change is known to cause breakage.
6459 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6460 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6461 1.10 and is now an error by default. It will become a hard error in the near
6463 * [The semantics relating modules to file system directories are changing in
6464 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6465 lint, which is a warning in this release, and will become a hard error in the
6467 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6468 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6469 the underlying iterator][37834]
6471 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6472 [33685]: https://github.com/rust-lang/rust/issues/33685
6473 [36868]: https://github.com/rust-lang/rust/pull/36868
6474 [37127]: https://github.com/rust-lang/rust/pull/37127
6475 [37229]: https://github.com/rust-lang/rust/pull/37229
6476 [37456]: https://github.com/rust-lang/rust/pull/37456
6477 [37527]: https://github.com/rust-lang/rust/pull/37527
6478 [37602]: https://github.com/rust-lang/rust/pull/37602
6479 [37613]: https://github.com/rust-lang/rust/pull/37613
6480 [37615]: https://github.com/rust-lang/rust/pull/37615
6481 [37636]: https://github.com/rust-lang/rust/pull/37636
6482 [37627]: https://github.com/rust-lang/rust/pull/37627
6483 [37642]: https://github.com/rust-lang/rust/pull/37642
6484 [37677]: https://github.com/rust-lang/rust/pull/37677
6485 [37699]: https://github.com/rust-lang/rust/pull/37699
6486 [37701]: https://github.com/rust-lang/rust/pull/37701
6487 [37705]: https://github.com/rust-lang/rust/pull/37705
6488 [37749]: https://github.com/rust-lang/rust/pull/37749
6489 [37760]: https://github.com/rust-lang/rust/pull/37760
6490 [37763]: https://github.com/rust-lang/rust/pull/37763
6491 [37764]: https://github.com/rust-lang/rust/pull/37764
6492 [37789]: https://github.com/rust-lang/rust/pull/37789
6493 [37791]: https://github.com/rust-lang/rust/pull/37791
6494 [37814]: https://github.com/rust-lang/rust/pull/37814
6495 [37817]: https://github.com/rust-lang/rust/pull/37817
6496 [37834]: https://github.com/rust-lang/rust/pull/37834
6497 [37848]: https://github.com/rust-lang/rust/pull/37848
6498 [37855]: https://github.com/rust-lang/rust/pull/37855
6499 [37882]: https://github.com/rust-lang/rust/pull/37882
6500 [37888]: https://github.com/rust-lang/rust/pull/37888
6501 [37973]: https://github.com/rust-lang/rust/pull/37973
6502 [37979]: https://github.com/rust-lang/rust/pull/37979
6503 [38086]: https://github.com/rust-lang/rust/pull/38086
6504 [38107]: https://github.com/rust-lang/rust/pull/38107
6505 [38117]: https://github.com/rust-lang/rust/pull/38117
6506 [38134]: https://github.com/rust-lang/rust/pull/38134
6507 [38146]: https://github.com/rust-lang/rust/pull/38146
6508 [38181]: https://github.com/rust-lang/rust/pull/38181
6509 [38182]: https://github.com/rust-lang/rust/pull/38182
6510 [38185]: https://github.com/rust-lang/rust/pull/38185
6511 [38192]: https://github.com/rust-lang/rust/pull/38192
6512 [38279]: https://github.com/rust-lang/rust/pull/38279
6513 [38835]: https://github.com/rust-lang/rust/pull/38835
6514 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6515 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6516 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6517 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6518 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6519 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6520 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6521 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6522 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6523 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6524 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6525 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6526 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6527 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6528 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6529 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6530 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6531 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6532 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6533 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6534 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6535 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6536 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6537 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6538 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6539 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6540 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6541 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6542 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6543 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6544 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6545 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6546 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6547 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6548 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6549 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6550 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6553 Version 1.14.0 (2016-12-22)
6554 ===========================
6559 * [`..` matches multiple tuple fields in enum variants, structs
6560 and tuples][36843]. [RFC 1492].
6561 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6562 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6563 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6564 dereferencing][36822]
6569 * [Mark enums with non-zero discriminant as non-zero][37224]
6570 * [Lower-case `static mut` names are linted like other
6571 statics and consts][37162]
6572 * [Fix ICE on some macros in const integer positions
6573 (e.g. `[u8; m!()]`)][36819]
6574 * [Improve error message and snippet for "did you mean `x`"][36798]
6575 * [Add a panic-strategy field to the target specification][36794]
6576 * [Include LLVM version in `--version --verbose`][37200]
6578 Compile-time Optimizations
6579 --------------------------
6581 * [Improve macro expansion performance][37569]
6582 * [Shrink `Expr_::ExprInlineAsm`][37445]
6583 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6584 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6585 * [Avoid more allocations when compiling html5ever][37373]
6586 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6587 * [Avoid some allocations in the macro parser][37318]
6588 * [Use a faster deflate setting][37298]
6589 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6590 during interning of slices][37270]
6591 * [Optimize `write_metadata`][37267]
6592 * [Don't process obligation forest cycles when stalled][37231]
6593 * [Avoid many `CrateConfig` clones][37161]
6594 * [Optimize `Substs::super_fold_with`][37108]
6595 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6596 * [Speed up `plug_leaks`][36917]
6601 * [`println!()`, with no arguments, prints newline][36825].
6602 Previously, an empty string was required to achieve the same.
6603 * [`Wrapping` impls standard binary and unary operators, as well as
6604 the `Sum` and `Product` iterators][37356]
6605 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6607 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6608 `VecDeque` iterators][37315]
6609 * [Improve `SipHasher` performance on small values][37312]
6610 * [Add Iterator trait TrustedLen to enable better FromIterator /
6612 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6613 * [`ReadDir` implements `Debug`][37221]
6614 * [Implement `RefUnwindSafe` for atomic types][37178]
6615 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6616 * [Avoid allocations in `Decoder::read_str`][37064]
6617 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6618 * [Impl `Debug` for raw pointers to unsized data][36880]
6619 * [Don't reuse `HashMap` random seeds][37470]
6620 * [The internal memory layout of `HashMap` is more cache-friendly, for
6621 significant improvements in some operations][36692]
6622 * [`HashMap` uses less memory on 32-bit architectures][36595]
6623 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6628 * [Expose rustc cfg values to build scripts][cargo/3243]
6629 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6630 * [Fix passing --features when testing multiple packages][cargo/3280]
6631 * [Use a single profile set per workspace][cargo/3249]
6632 * [Load `replace` sections from lock files][cargo/3220]
6633 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6638 * [rustup is the recommended Rust installation method][1.14rustup]
6639 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6640 S390x. These are [tier 2] platforms and may have major defects. Follow the
6641 instructions on the website to install, or add the targets to an existing
6642 installation with `rustup target add`. The new target triples are:
6643 - `mips-unknown-linux-gnu`
6644 - `mipsel-unknown-linux-gnu`
6645 - `mips64-unknown-linux-gnuabi64`
6646 - `mips64el-unknown-linux-gnuabi64 `
6647 - `powerpc-unknown-linux-gnu`
6648 - `powerpc64-unknown-linux-gnu`
6649 - `powerpc64le-unknown-linux-gnu`
6650 - `s390x-unknown-linux-gnu `
6651 * This release includes target (std) builds for ARM Linux running MUSL
6652 libc. These are [tier 2] platforms and may have major defects. Add the
6653 following triples to an existing rustup installation with `rustup target add`:
6654 - `arm-unknown-linux-musleabi`
6655 - `arm-unknown-linux-musleabihf`
6656 - `armv7-unknown-linux-musleabihf`
6657 * This release includes [experimental support for WebAssembly][1.14wasm], via
6658 the `wasm32-unknown-emscripten` target. This target is known to have major
6659 defects. Please test, report, and fix.
6660 * rustup no longer installs documentation by default. Run `rustup
6661 component add rust-docs` to install.
6662 * [Fix line stepping in debugger][37310]
6663 * [Enable line number debuginfo in releases][37280]
6668 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6669 * [Add support for Fuchsia OS][37313]
6670 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6675 * [A number of forward-compatibility lints used by the compiler
6676 to gradually introduce language changes have been converted
6677 to deny by default][36894]:
6678 - ["use of inaccessible extern crate erroneously allowed"][36886]
6679 - ["type parameter default erroneously allowed in invalid location"][36887]
6680 - ["detects super or self keywords at the beginning of global path"][36888]
6681 - ["two overlapping inherent impls define an item with the same name
6682 were erroneously allowed"][36889]
6683 - ["floating-point constants cannot be used in patterns"][36890]
6684 - ["constants of struct or enum type can only be used in a pattern if
6685 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6686 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6687 * [Prohibit patterns in trait methods without bodies][37378]
6688 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6689 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6690 * [The `$crate` macro variable is accepted in fewer locations][37213]
6691 * [Impls specifying extra region requirements beyond the trait
6692 they implement are rejected][37167]
6693 * [Enums may not be unsized][37111]. Unsized enums are intended to
6694 work but never have. For now they are forbidden.
6695 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6697 [tier 2]: https://forge.rust-lang.org/platform-support.html
6698 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6699 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6700 [36430]: https://github.com/rust-lang/rust/pull/36430
6701 [36595]: https://github.com/rust-lang/rust/pull/36595
6702 [36692]: https://github.com/rust-lang/rust/pull/36692
6703 [36767]: https://github.com/rust-lang/rust/pull/36767
6704 [36794]: https://github.com/rust-lang/rust/pull/36794
6705 [36798]: https://github.com/rust-lang/rust/pull/36798
6706 [36819]: https://github.com/rust-lang/rust/pull/36819
6707 [36822]: https://github.com/rust-lang/rust/pull/36822
6708 [36825]: https://github.com/rust-lang/rust/pull/36825
6709 [36843]: https://github.com/rust-lang/rust/pull/36843
6710 [36880]: https://github.com/rust-lang/rust/pull/36880
6711 [36886]: https://github.com/rust-lang/rust/issues/36886
6712 [36887]: https://github.com/rust-lang/rust/issues/36887
6713 [36888]: https://github.com/rust-lang/rust/issues/36888
6714 [36889]: https://github.com/rust-lang/rust/issues/36889
6715 [36890]: https://github.com/rust-lang/rust/issues/36890
6716 [36891]: https://github.com/rust-lang/rust/issues/36891
6717 [36892]: https://github.com/rust-lang/rust/issues/36892
6718 [36894]: https://github.com/rust-lang/rust/pull/36894
6719 [36917]: https://github.com/rust-lang/rust/pull/36917
6720 [36993]: https://github.com/rust-lang/rust/pull/36993
6721 [37037]: https://github.com/rust-lang/rust/pull/37037
6722 [37064]: https://github.com/rust-lang/rust/pull/37064
6723 [37094]: https://github.com/rust-lang/rust/pull/37094
6724 [37108]: https://github.com/rust-lang/rust/pull/37108
6725 [37111]: https://github.com/rust-lang/rust/pull/37111
6726 [37161]: https://github.com/rust-lang/rust/pull/37161
6727 [37162]: https://github.com/rust-lang/rust/pull/37162
6728 [37167]: https://github.com/rust-lang/rust/pull/37167
6729 [37178]: https://github.com/rust-lang/rust/pull/37178
6730 [37200]: https://github.com/rust-lang/rust/pull/37200
6731 [37213]: https://github.com/rust-lang/rust/pull/37213
6732 [37221]: https://github.com/rust-lang/rust/pull/37221
6733 [37224]: https://github.com/rust-lang/rust/pull/37224
6734 [37230]: https://github.com/rust-lang/rust/pull/37230
6735 [37231]: https://github.com/rust-lang/rust/pull/37231
6736 [37247]: https://github.com/rust-lang/rust/pull/37247
6737 [37267]: https://github.com/rust-lang/rust/pull/37267
6738 [37270]: https://github.com/rust-lang/rust/pull/37270
6739 [37273]: https://github.com/rust-lang/rust/pull/37273
6740 [37280]: https://github.com/rust-lang/rust/pull/37280
6741 [37298]: https://github.com/rust-lang/rust/pull/37298
6742 [37306]: https://github.com/rust-lang/rust/pull/37306
6743 [37310]: https://github.com/rust-lang/rust/pull/37310
6744 [37312]: https://github.com/rust-lang/rust/pull/37312
6745 [37313]: https://github.com/rust-lang/rust/pull/37313
6746 [37315]: https://github.com/rust-lang/rust/pull/37315
6747 [37318]: https://github.com/rust-lang/rust/pull/37318
6748 [37322]: https://github.com/rust-lang/rust/pull/37322
6749 [37326]: https://github.com/rust-lang/rust/pull/37326
6750 [37351]: https://github.com/rust-lang/rust/pull/37351
6751 [37356]: https://github.com/rust-lang/rust/pull/37356
6752 [37367]: https://github.com/rust-lang/rust/pull/37367
6753 [37373]: https://github.com/rust-lang/rust/pull/37373
6754 [37378]: https://github.com/rust-lang/rust/pull/37378
6755 [37389]: https://github.com/rust-lang/rust/pull/37389
6756 [37392]: https://github.com/rust-lang/rust/pull/37392
6757 [37427]: https://github.com/rust-lang/rust/pull/37427
6758 [37439]: https://github.com/rust-lang/rust/pull/37439
6759 [37445]: https://github.com/rust-lang/rust/pull/37445
6760 [37470]: https://github.com/rust-lang/rust/pull/37470
6761 [37569]: https://github.com/rust-lang/rust/pull/37569
6762 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6763 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6764 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6765 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6766 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6767 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6768 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6771 Version 1.13.0 (2016-11-10)
6772 ===========================
6777 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6778 errors, like the `try!` macro, described in [RFC 0243].
6779 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6780 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6781 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6782 * [Fix lifetime rules for 'if' conditions][36029]
6783 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6788 * [Add the `-C link-arg` argument][36574]
6789 * [Remove the old AST-based backend from rustc_trans][35764]
6790 * [Don't enable NEON by default on armv7 Linux][35814]
6791 * [Fix debug line number info for macro expansions][35238]
6792 * [Do not emit "class method" debuginfo for types that are not
6793 DICompositeType][36008]
6794 * [Warn about multiple conflicting #[repr] hints][34623]
6795 * [When sizing DST, don't double-count nested struct prefixes][36351]
6796 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6797 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6798 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6799 * [Expand macros without recursing to avoid stack overflows][36214]
6804 * [Replace macro backtraces with labeled local uses][35702]
6805 * [Improve error message for misplaced doc comments][33922]
6806 * [Buffer unix and lock windows to prevent message interleaving][35975]
6807 * [Update lifetime errors to specifically note temporaries][36171]
6808 * [Special case a few colors for Windows][36178]
6809 * [Suggest `use self` when such an import resolves][36289]
6810 * [Be more specific when type parameter shadows primitive type][36338]
6811 * Many minor improvements
6813 Compile-time Optimizations
6814 --------------------------
6816 * [Compute and cache HIR hashes at beginning][35854]
6817 * [Don't hash types in loan paths][36004]
6818 * [Cache projections in trans][35761]
6819 * [Optimize the parser's last token handling][36527]
6820 * [Only instantiate #[inline] functions in codegen units referencing
6821 them][36524]. This leads to big improvements in cases where crates export
6822 define many inline functions without using them directly.
6823 * [Lazily allocate TypedArena's first chunk][36592]
6824 * [Don't allocate during default HashSet creation][36734]
6831 * [`overflowing_abs`]
6832 * [`RefCell::try_borrow`]
6833 * [`RefCell::try_borrow_mut`]
6838 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6839 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6841 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6842 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6843 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6844 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6845 * [Use arc4rand on FreeBSD][35884]
6846 * [memrchr: Correct aligned offset computation][35969]
6847 * [Improve Demangling of Rust Symbols][36059]
6848 * [Use monotonic time in condition variables][35048]
6849 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6850 * [Implement conversion traits for `char`][35755]
6851 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6852 * [Zero first byte of CString on drop][36264]
6853 * [Inherit overflow checks for sum and product][36372]
6854 * [Add missing Eq implementations][36423]
6855 * [Implement `Debug` for `DirEntry`][36631]
6856 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6858 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6859 * [Implement more traits for `std::io::ErrorKind`][35911]
6860 * [Optimize BinaryHeap bounds checking][36072]
6861 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6862 `extend_with_element`][36355]
6863 * [Fix overflow checking in unsigned pow()][34942]
6868 * This release includes security fixes to both curl and OpenSSL.
6869 * [Fix transitive doctests when panic=abort][cargo/3021]
6870 * [Add --all-features flag to cargo][cargo/3038]
6871 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6872 * [Don't parse the home directory more than once][cargo/3078]
6873 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6874 * [Update OpenSSL to 1.0.2j][cargo/3121]
6875 * [Add license and license_file to cargo metadata output][cargo/3110]
6876 * [Make crates-io registry URL optional in config; ignore all changes to
6877 source.crates-io][cargo/3089]
6878 * [Don't download dependencies from other platforms][cargo/3123]
6879 * [Build transitive dev-dependencies when needed][cargo/3125]
6880 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6881 * [Avoid updating registry when adding existing deps][cargo/3144]
6882 * [Warn about path overrides that won't work][cargo/3136]
6883 * [Use workspaces during `cargo install`][cargo/3146]
6884 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6885 * [Add --message-format flag][cargo/3000]
6886 * [Pass target environment for rustdoc][cargo/3205]
6887 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6888 * [Update curl and curl-sys][cargo/3241]
6889 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6894 * [rustdoc: Add the `--sysroot` argument][36586]
6895 * [rustdoc: Fix a couple of issues with the search results][35655]
6896 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6897 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6898 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6903 * [Remove unmaintained style guide][35124]
6904 * [Add s390x support][36369]
6905 * [Initial work at Haiku OS support][36727]
6906 * [Add mips-uclibc targets][35734]
6907 * [Crate-ify compiler-rt into compiler-builtins][35021]
6908 * [Add rustc version info (git hash + date) to dist tarball][36213]
6909 * Many documentation improvements
6914 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6915 * [Deny (by default) transmuting from fn item types to pointer-sized
6916 types][34923]. Continuing the long transition to zero-sized fn items,
6918 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6920 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6921 * [Fix lifetime rules for 'if' conditions][36029].
6922 * [Inherit overflow checks for sum and product][36372].
6923 * [Forbid user-defined macros named "macro_rules"][36730].
6925 [33922]: https://github.com/rust-lang/rust/pull/33922
6926 [34623]: https://github.com/rust-lang/rust/pull/34623
6927 [34923]: https://github.com/rust-lang/rust/pull/34923
6928 [34942]: https://github.com/rust-lang/rust/pull/34942
6929 [35021]: https://github.com/rust-lang/rust/pull/35021
6930 [35048]: https://github.com/rust-lang/rust/pull/35048
6931 [35074]: https://github.com/rust-lang/rust/pull/35074
6932 [35124]: https://github.com/rust-lang/rust/pull/35124
6933 [35234]: https://github.com/rust-lang/rust/pull/35234
6934 [35238]: https://github.com/rust-lang/rust/pull/35238
6935 [35354]: https://github.com/rust-lang/rust/pull/35354
6936 [35559]: https://github.com/rust-lang/rust/pull/35559
6937 [35585]: https://github.com/rust-lang/rust/pull/35585
6938 [35627]: https://github.com/rust-lang/rust/pull/35627
6939 [35655]: https://github.com/rust-lang/rust/pull/35655
6940 [35702]: https://github.com/rust-lang/rust/pull/35702
6941 [35707]: https://github.com/rust-lang/rust/pull/35707
6942 [35728]: https://github.com/rust-lang/rust/pull/35728
6943 [35734]: https://github.com/rust-lang/rust/pull/35734
6944 [35755]: https://github.com/rust-lang/rust/pull/35755
6945 [35761]: https://github.com/rust-lang/rust/pull/35761
6946 [35764]: https://github.com/rust-lang/rust/pull/35764
6947 [35814]: https://github.com/rust-lang/rust/pull/35814
6948 [35854]: https://github.com/rust-lang/rust/pull/35854
6949 [35871]: https://github.com/rust-lang/rust/pull/35871
6950 [35884]: https://github.com/rust-lang/rust/pull/35884
6951 [35911]: https://github.com/rust-lang/rust/pull/35911
6952 [35969]: https://github.com/rust-lang/rust/pull/35969
6953 [35975]: https://github.com/rust-lang/rust/pull/35975
6954 [36004]: https://github.com/rust-lang/rust/pull/36004
6955 [36008]: https://github.com/rust-lang/rust/pull/36008
6956 [36014]: https://github.com/rust-lang/rust/pull/36014
6957 [36029]: https://github.com/rust-lang/rust/pull/36029
6958 [36059]: https://github.com/rust-lang/rust/pull/36059
6959 [36072]: https://github.com/rust-lang/rust/pull/36072
6960 [36101]: https://github.com/rust-lang/rust/pull/36101
6961 [36104]: https://github.com/rust-lang/rust/pull/36104
6962 [36171]: https://github.com/rust-lang/rust/pull/36171
6963 [36173]: https://github.com/rust-lang/rust/pull/36173
6964 [36178]: https://github.com/rust-lang/rust/pull/36178
6965 [36213]: https://github.com/rust-lang/rust/pull/36213
6966 [36214]: https://github.com/rust-lang/rust/pull/36214
6967 [36264]: https://github.com/rust-lang/rust/pull/36264
6968 [36266]: https://github.com/rust-lang/rust/pull/36266
6969 [36289]: https://github.com/rust-lang/rust/pull/36289
6970 [36338]: https://github.com/rust-lang/rust/pull/36338
6971 [36351]: https://github.com/rust-lang/rust/pull/36351
6972 [36355]: https://github.com/rust-lang/rust/pull/36355
6973 [36369]: https://github.com/rust-lang/rust/pull/36369
6974 [36372]: https://github.com/rust-lang/rust/pull/36372
6975 [36423]: https://github.com/rust-lang/rust/pull/36423
6976 [36482]: https://github.com/rust-lang/rust/pull/36482
6977 [36505]: https://github.com/rust-lang/rust/pull/36505
6978 [36524]: https://github.com/rust-lang/rust/pull/36524
6979 [36527]: https://github.com/rust-lang/rust/pull/36527
6980 [36551]: https://github.com/rust-lang/rust/pull/36551
6981 [36574]: https://github.com/rust-lang/rust/pull/36574
6982 [36586]: https://github.com/rust-lang/rust/pull/36586
6983 [36592]: https://github.com/rust-lang/rust/pull/36592
6984 [36631]: https://github.com/rust-lang/rust/pull/36631
6985 [36721]: https://github.com/rust-lang/rust/pull/36721
6986 [36727]: https://github.com/rust-lang/rust/pull/36727
6987 [36730]: https://github.com/rust-lang/rust/pull/36730
6988 [36734]: https://github.com/rust-lang/rust/pull/36734
6989 [36754]: https://github.com/rust-lang/rust/pull/36754
6990 [36995]: https://github.com/rust-lang/rust/pull/36995
6991 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6992 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6993 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6994 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6995 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6996 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6997 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6998 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6999 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7000 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7001 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7002 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7003 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7004 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7005 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7006 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7007 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7008 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7009 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7010 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7011 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7012 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7013 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7014 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7015 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7016 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7017 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7018 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7019 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7020 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7021 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7022 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7025 Version 1.12.1 (2016-10-20)
7026 ===========================
7031 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7032 * [Confusion with double negation and booleans][36856]
7033 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7034 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7035 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7036 * [Corrupted memory after updated to 1.12][36936]
7037 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7038 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7039 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7041 [36381]: https://github.com/rust-lang/rust/issues/36381
7042 [36856]: https://github.com/rust-lang/rust/issues/36856
7043 [36875]: https://github.com/rust-lang/rust/issues/36875
7044 [36924]: https://github.com/rust-lang/rust/issues/36924
7045 [36926]: https://github.com/rust-lang/rust/issues/36926
7046 [36936]: https://github.com/rust-lang/rust/issues/36936
7047 [37026]: https://github.com/rust-lang/rust/issues/37026
7048 [37112]: https://github.com/rust-lang/rust/issues/37112
7049 [37153]: https://github.com/rust-lang/rust/issues/37153
7052 Version 1.12.0 (2016-09-29)
7053 ===========================
7058 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7059 This translation pass is far simpler than the previous AST->LLVM pass, and
7060 creates opportunities to perform new optimizations directly on the MIR. It
7061 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7062 * [`rustc` presents a new, more readable error format, along with
7063 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7064 Most common editors supporting Rust have been updated to work with it. It was
7065 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7070 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7071 This translation pass is far simpler than the previous AST->LLVM pass, and
7072 creates opportunities to perform new optimizations directly on the MIR. It
7073 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7074 * [Print the Rust target name, not the LLVM target name, with
7075 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7076 * [The computation of `TypeId` is correct in some cases where it was previously
7077 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7078 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7079 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7080 `--print relocation-models`, and `--print code-models` print the available
7081 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7082 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7083 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7084 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7085 These targets produce statically-linked binaries. There are no binary release
7091 * [`rustc` presents a new, more readable error format, along with
7092 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7093 Most common editors supporting Rust have been updated to work with it. It was
7094 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7095 * [In error descriptions, references are now described in plain English,
7096 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7097 * [In error type descriptions, unknown numeric types are named `{integer}` or
7098 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7099 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7104 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7105 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7106 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7107 useful](https://github.com/rust-lang/rust/pull/34908)
7108 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7109 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7110 * [Semicolons are properly required as statement delimiters inside
7111 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7112 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7117 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7118 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7119 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7120 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7121 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7122 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7123 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7124 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7125 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7126 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7127 Both on Unix and Windows.
7128 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7129 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7130 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7131 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7132 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7133 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7134 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7135 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7140 * [The `format!` macro and friends now allow a single argument to be formatted
7141 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7142 * [The lifetime bounds on `[T]::binary_search_by` and
7143 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7144 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7145 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7146 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7147 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7148 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7149 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7150 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7151 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7152 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7153 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7154 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7155 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7156 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7157 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7158 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7159 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7160 * [`mpsc::sync_channel` `Receiver`s return any available message before
7161 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7162 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7163 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7168 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7169 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7170 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7171 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7172 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7173 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7174 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7175 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7176 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7177 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7178 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7179 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7180 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7181 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7182 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7183 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7188 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7189 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7194 * [Test binaries now support a `--test-threads` argument to specify the number
7195 of threads used to run tests, and which acts the same as the
7196 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7197 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7198 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7199 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7200 * [Rust releases now come with source packages that can be installed by rustup
7201 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7202 The resulting source code can be used by tools and IDES, located in the
7203 sysroot under `lib/rustlib/src`.
7208 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7209 * Many minor improvements to the documentation.
7210 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7215 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7216 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7217 * [When formatting strings, if "precision" is specified, the "fill",
7218 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7219 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7222 Version 1.11.0 (2016-08-18)
7223 ===========================
7228 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7229 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7230 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7231 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7236 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7237 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7238 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7239 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7240 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7241 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7242 (in libcore - previously stabilized in libstd)
7243 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7244 (in libcore - previously stabilized in libstd)
7245 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7246 (in libcore - previously stabilized in libstd)
7247 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7248 (in libcore - previously stabilized in libstd)
7249 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7250 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7251 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7252 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7257 * [The `thread_local!` macro supports multiple definitions in a single
7258 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7259 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7260 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7261 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7262 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7263 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7264 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7265 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7270 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7271 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7272 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7273 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7274 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7275 and `-vv` prints warnings for all crates.
7276 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7277 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7278 This provides room for expansion by arbitrary tools.
7279 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7280 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7281 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7282 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7283 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7284 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7285 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7290 * [Caching projections speeds up type check dramatically for some
7291 workloads](https://github.com/rust-lang/rust/pull/33816)
7292 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7293 This hasher is faster, but is believed to provide sufficient
7294 protection from collision attacks.
7295 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7300 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7301 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7302 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7303 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7304 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7309 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7310 * [When emitting debug info, rustc emits frame pointers for closures,
7311 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7312 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7313 * Many more errors have been given error codes and extended
7315 * API documentation continues to be improved, with many new examples
7320 * [rustc no longer hangs when dependencies recursively re-export
7321 submodules](https://github.com/rust-lang/rust/pull/34542)
7322 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7323 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7324 rewritten](https://github.com/rust-lang/rust/pull/33895)
7325 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7326 No targets use this yet, but it works toward AVR support.
7331 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7332 * [The new follow-set rules that place restrictions on `macro_rules!`
7333 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7334 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7335 and has been a warning since 1.10.
7336 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7337 This causes breakage in some corner cases.
7340 Version 1.10.0 (2016-07-07)
7341 ===========================
7346 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7347 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7348 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7349 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7350 * [`panic!` can be converted to a runtime abort with the
7351 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7352 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7353 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7354 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7355 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7356 Note that Cargo does not yet directly support cdylibs.
7361 * `os::windows::fs::OpenOptionsExt::access_mode`
7362 * `os::windows::fs::OpenOptionsExt::share_mode`
7363 * `os::windows::fs::OpenOptionsExt::custom_flags`
7364 * `os::windows::fs::OpenOptionsExt::attributes`
7365 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7366 * `os::unix::fs::OpenOptionsExt::custom_flags`
7367 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7368 * `Default for sync::Weak`
7369 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7370 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7371 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7372 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7373 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7374 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7375 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7376 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7377 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7378 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7379 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7380 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7381 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7382 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7383 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7384 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7385 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7386 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7387 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7388 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7389 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7390 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7391 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7392 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7393 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7394 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7395 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7396 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7397 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7398 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7399 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7400 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7401 * Read/Write/RawFd impls for `UnixStream`
7402 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7403 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7404 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7405 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7406 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7407 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7408 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7409 * RawFd impls for `UnixListener`
7410 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7411 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7412 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7413 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7414 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7415 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7416 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7417 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7418 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7419 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7420 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7421 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7422 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7423 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7424 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7425 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7426 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7427 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7428 * RawFd impls for `UnixDatagram`
7429 * `{BTree,Hash}Map::values_mut`
7430 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7435 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7436 The semantics of this minor method are subtle and probably not what
7438 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7439 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7440 will fall back to `/dev/urandom` temporarily to avoid blocking
7441 during early boot](https://github.com/rust-lang/rust/pull/33086).
7442 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7443 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7444 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7445 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7446 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7447 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7448 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7452 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7453 This controls the runtime behavior of the `panic!` macro
7454 and can be either "unwind" (the default), or "abort".
7455 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7456 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7457 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7458 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7459 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7460 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7461 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7462 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7463 By default they are retried twice, which can be customized with the
7464 `net.retry` value in `.cargo/config`.
7465 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7466 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7467 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7468 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7469 Makes it possible to install multiple crates in parallel.
7470 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7471 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7472 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7473 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7474 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7475 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7480 * [rustc memory usage was reduced by refactoring the context used for
7481 type checking](https://github.com/rust-lang/rust/pull/33425).
7482 * [Speed up creation of `HashMap`s by caching the random keys used
7483 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7484 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7485 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7486 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7487 10x faster than the previous lookup tables.
7488 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7493 * Many incremental improvements to documentation and rustdoc.
7494 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7495 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7496 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7497 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7498 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7499 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7500 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7505 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7506 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7507 * [`std` no longer prints backtraces on platforms where the running
7508 module must be loaded with `env::current_exe`, which can't be relied
7509 on](https://github.com/rust-lang/rust/pull/33554).
7510 * This release includes std binaries for the i586-unknown-linux-gnu,
7511 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7512 i586 target is for old x86 hardware without SSE2, and the armv7
7513 target is for Android running on modern ARM architectures.
7514 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7515 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7516 * [On Unix the runtime aborts by calling `libc::abort` instead of
7517 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7518 * [Rust is now bootstrapped from the previous release of Rust,
7519 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7524 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7525 * [`target_env` for Linux ARM targets is just `gnu`, not
7526 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7527 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7528 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7529 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7530 Affects how macros are parsed.
7531 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7532 * [Feature-gated attributes on macro-generated macro invocations are
7533 now rejected](https://github.com/rust-lang/rust/pull/32791).
7534 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7535 This caused some minor changes to type inference.
7538 Version 1.9.0 (2016-05-26)
7539 ==========================
7544 * The `#[deprecated]` attribute when applied to an API will generate
7545 warnings when used. The warnings may be suppressed with
7546 `#[allow(deprecated)]`. [RFC 1270].
7547 * [`fn` item types are zero sized, and each `fn` names a unique
7548 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7549 `transmute` on a `fn` type will generate a warning for a few cycles,
7550 then will be converted to an error.
7551 * [Field and method resolution understand visibility, so private
7552 fields and methods cannot prevent the proper use of public fields
7553 and methods][1.9fv].
7554 * [The parser considers unicode codepoints in the
7555 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7561 * [`std::panic::catch_unwind`] (renamed from `recover`)
7562 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7563 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7564 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7565 * [`str::is_char_boundary`]
7566 * [`<*const T>::as_ref`]
7567 * [`<*mut T>::as_ref`]
7568 * [`<*mut T>::as_mut`]
7569 * [`AsciiExt::make_ascii_uppercase`]
7570 * [`AsciiExt::make_ascii_lowercase`]
7571 * [`char::decode_utf16`]
7572 * [`char::DecodeUtf16`]
7573 * [`char::DecodeUtf16Error`]
7574 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7575 * [`BTreeSet::take`]
7576 * [`BTreeSet::replace`]
7579 * [`HashSet::replace`]
7581 * [`OsString::with_capacity`]
7582 * [`OsString::clear`]
7583 * [`OsString::capacity`]
7584 * [`OsString::reserve`]
7585 * [`OsString::reserve_exact`]
7586 * [`OsStr::is_empty`]
7588 * [`std::os::unix::thread`]
7591 * [`JoinHandleExt::as_pthread_t`]
7592 * [`JoinHandleExt::into_pthread_t`]
7593 * [`HashSet::hasher`]
7594 * [`HashMap::hasher`]
7595 * [`CommandExt::exec`]
7596 * [`File::try_clone`]
7597 * [`SocketAddr::set_ip`]
7598 * [`SocketAddr::set_port`]
7599 * [`SocketAddrV4::set_ip`]
7600 * [`SocketAddrV4::set_port`]
7601 * [`SocketAddrV6::set_ip`]
7602 * [`SocketAddrV6::set_port`]
7603 * [`SocketAddrV6::set_flowinfo`]
7604 * [`SocketAddrV6::set_scope_id`]
7605 * [`slice::copy_from_slice`]
7606 * [`ptr::read_volatile`]
7607 * [`ptr::write_volatile`]
7608 * [`OpenOptions::create_new`]
7609 * [`TcpStream::set_nodelay`]
7610 * [`TcpStream::nodelay`]
7611 * [`TcpStream::set_ttl`]
7612 * [`TcpStream::ttl`]
7613 * [`TcpStream::set_only_v6`]
7614 * [`TcpStream::only_v6`]
7615 * [`TcpStream::take_error`]
7616 * [`TcpStream::set_nonblocking`]
7617 * [`TcpListener::set_ttl`]
7618 * [`TcpListener::ttl`]
7619 * [`TcpListener::set_only_v6`]
7620 * [`TcpListener::only_v6`]
7621 * [`TcpListener::take_error`]
7622 * [`TcpListener::set_nonblocking`]
7623 * [`UdpSocket::set_broadcast`]
7624 * [`UdpSocket::broadcast`]
7625 * [`UdpSocket::set_multicast_loop_v4`]
7626 * [`UdpSocket::multicast_loop_v4`]
7627 * [`UdpSocket::set_multicast_ttl_v4`]
7628 * [`UdpSocket::multicast_ttl_v4`]
7629 * [`UdpSocket::set_multicast_loop_v6`]
7630 * [`UdpSocket::multicast_loop_v6`]
7631 * [`UdpSocket::set_multicast_ttl_v6`]
7632 * [`UdpSocket::multicast_ttl_v6`]
7633 * [`UdpSocket::set_ttl`]
7634 * [`UdpSocket::ttl`]
7635 * [`UdpSocket::set_only_v6`]
7636 * [`UdpSocket::only_v6`]
7637 * [`UdpSocket::join_multicast_v4`]
7638 * [`UdpSocket::join_multicast_v6`]
7639 * [`UdpSocket::leave_multicast_v4`]
7640 * [`UdpSocket::leave_multicast_v6`]
7641 * [`UdpSocket::take_error`]
7642 * [`UdpSocket::connect`]
7643 * [`UdpSocket::send`]
7644 * [`UdpSocket::recv`]
7645 * [`UdpSocket::set_nonblocking`]
7650 * [`std::sync::Once` is poisoned if its initialization function
7652 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7653 * [Most types implement `fmt::Debug`][1.9db].
7654 * [The default buffer size used by `BufReader` and `BufWriter` was
7655 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7656 used by other languages.
7657 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7658 `Duration` additionally implements `*=` and `/=`][1.9ta].
7659 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7660 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7661 * [`Chain` implements `BufRead`][1.9ch].
7662 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7667 * [Cargo can now run concurrently][1.9cc].
7668 * [Top-level overrides allow specific revisions of crates to be
7669 overridden through the entire crate graph][1.9ct]. This is intended
7670 to make upgrades easier for large projects, by allowing crates to be
7671 forked temporarily until they've been upgraded and republished.
7672 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7673 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7674 on the commandline][1.9cf]. `rustc` arguments can also be specified
7675 in the `build.rustflags` configuration key.
7680 * [The time complexity of comparing variables for equivalence during type
7681 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7682 to major compilation time improvement in some scenarios.
7683 * [`ToString` is specialized for `str`, giving it the same performance
7684 as `to_owned`][1.9ts].
7685 * [Spawning processes with `Command::output` no longer creates extra
7687 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7688 for C-like enums][1.9cl].
7693 * [Passing the `--quiet` flag to a test runner will produce
7694 much-abbreviated output][1.9q].
7695 * The Rust Project now publishes std binaries for the
7696 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7697 `i586-pc-windows-msvc` targets.
7702 * [`std::sync::Once` is poisoned if its initialization function
7704 * [It is illegal to define methods with the same name in overlapping
7705 inherent `impl` blocks][1.9sn].
7706 * [`fn` item types are zero sized, and each `fn` names a unique
7707 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7708 `transmute` on a `fn` type will generate a warning for a few cycles,
7709 then will be converted to an error.
7710 * [Improvements to const evaluation may trigger new errors when integer
7711 literals are out of range][1.9ce].
7714 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7715 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7716 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7717 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7718 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7719 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7720 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7721 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7722 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7723 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7724 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7725 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7726 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7727 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7728 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7729 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7730 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7731 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7732 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7733 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7734 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7735 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7736 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7737 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7738 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7739 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7740 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7741 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7742 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7743 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7744 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7745 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7746 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7747 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7748 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7749 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7750 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7751 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7752 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7753 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7754 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7755 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7756 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7757 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7758 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7759 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7760 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7761 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7762 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7763 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7764 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7765 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7766 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7767 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7768 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7769 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7770 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7771 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7772 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7773 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7774 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7775 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7776 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7777 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7778 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7779 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7780 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7781 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7782 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7783 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7784 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7785 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7786 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7787 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7788 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7789 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7790 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7791 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7792 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7793 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7794 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7795 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7796 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7797 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7798 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7799 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7800 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7801 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7802 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7803 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7804 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7805 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7806 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7807 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7808 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7809 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7810 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7811 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7812 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7813 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7814 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7815 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7816 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7817 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7818 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7819 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7820 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7821 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7822 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7823 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7826 Version 1.8.0 (2016-04-14)
7827 ==========================
7832 * Rust supports overloading of compound assignment statements like
7833 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7834 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7835 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7837 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7838 addition to the non-braced form, `struct Foo;`. [RFC 218].
7844 * [`str::encode_utf16`] (renamed from `utf16_units`)
7845 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7848 * [`ptr::drop_in_place`]
7850 * [`time::SystemTime`]
7852 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7853 * [`Instant::elapsed`]
7854 * [`SystemTime::now`]
7855 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7856 * [`SystemTime::elapsed`]
7857 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7858 * [`SystemTimeError`]
7859 * [`SystemTimeError::duration`]
7860 * Various impls for `SystemTimeError`
7862 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7863 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7864 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7865 * [The `write!` and `writeln!` macros correctly emit errors if any of
7866 their arguments can't be formatted][1.8w].
7867 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7868 * [The Unix-specific `raw` modules, which contain a number of
7869 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7870 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7871 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7872 across platforms was making it difficult to implement `std`
7873 correctly. Those that need these definitions should use the `libc`
7875 * The Unix-specific `MetadataExt` traits, including
7876 `os::unix::fs::MetadataExt`, which expose values such as inode
7877 numbers [no longer return platform-specific types][1.8r], but
7878 instead return widened integers. [RFC 1415].
7879 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7880 * [Atomic loads and stores are not volatile][1.8a].
7881 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7886 * [Inlining hash functions lead to a 3% compile-time improvement in
7887 some workloads][1.8h].
7888 * When using jemalloc, its symbols are [unprefixed so that it
7889 overrides the libc malloc implementation][1.8h]. This means that for
7890 rustc, LLVM is now using jemalloc, which results in a 6%
7891 compile-time improvement on a specific workload.
7892 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7897 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7898 i686-pc-windows-msvc is now considered a tier-1 platform.
7899 * [The `--print targets` flag prints a list of supported targets][1.8t].
7900 * [The `--print cfg` flag prints the `cfg`s defined for the current
7902 * [`rustc` can be built with an new Cargo-based build system, written
7903 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7904 build system. To enable it configure with `configure --rustbuild`.
7905 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7906 variants while also indicating the total number of missing variants
7907 if more than 3][1.8m].
7908 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7909 * The Rust Project now publishes binary releases of the standard
7910 library for a number of tier-2 targets:
7911 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7912 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7913 `x86_64-rumprun-netbsd`. These can be installed with
7914 tools such as [multirust][1.8mr].
7919 * [`cargo init` creates a new Cargo project in the current
7920 directory][1.8ci]. It is otherwise like `cargo new`.
7921 * [Cargo has configuration keys for `-v` and
7922 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7923 `[term]` section of `.cargo/config`.
7924 * [Configuration keys that evaluate to strings or integers can be set
7925 via environment variables][1.8ce]. For example the `build.jobs` key
7926 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7927 precedence over config files.
7928 * [Target-specific dependencies support Rust `cfg` syntax for
7929 describing targets][1.8cfg] so that dependencies for multiple
7930 targets can be specified together. [RFC 1361].
7931 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7932 `RUSTDOC` take precedence over the `build.target-dir`,
7933 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
7934 * [The child process tree is killed on Windows when Cargo is
7936 * [The `build.target` configuration value sets the target platform,
7937 like `--target`][1.8ct].
7942 * [Unstable compiler flags have been further restricted][1.8u]. Since
7943 1.0 `-Z` flags have been considered unstable, and other flags that
7944 were considered unstable additionally required passing `-Z
7945 unstable-options` to access. Unlike unstable language and library
7946 features though, these options have been accessible on the stable
7947 release channel. Going forward, *new unstable flags will not be
7948 available on the stable release channel*, and old unstable flags
7949 will warn about their usage. In the future, all unstable flags will
7950 be unavailable on the stable release channel.
7951 * [It is no longer possible to `match` on empty enum variants using
7952 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7953 * The Unix-specific `MetadataExt` traits, including
7954 `os::unix::fs::MetadataExt`, which expose values such as inode
7955 numbers [no longer return platform-specific types][1.8r], but
7956 instead return widened integers. [RFC 1415].
7957 * [Modules sourced from the filesystem cannot appear within arbitrary
7958 blocks, but only within other modules][1.8mf].
7959 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7960 * On Unix, [stack overflow triggers a runtime abort instead of a
7962 * [`Command::spawn` and its equivalents return an error if any of
7963 its command-line arguments contain interior `NUL`s][1.8n].
7964 * [Tuple and unit enum variants from other crates are in the type
7966 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7967 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7968 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7969 instead of `foo.lib`.
7972 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7973 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7974 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7975 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7976 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7977 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7978 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7979 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7980 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7981 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7982 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7983 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
7984 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7985 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7986 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7987 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7988 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7989 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7990 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7991 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7992 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7993 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7994 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7995 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7996 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7997 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7998 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7999 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8000 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8001 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8002 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8003 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8004 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8005 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8006 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8007 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8008 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8009 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8010 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8011 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8012 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8013 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8014 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8015 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8016 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8017 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8018 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8019 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8020 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8021 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8022 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8023 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8024 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8025 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8026 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8027 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8028 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8029 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8030 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8031 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8034 Version 1.7.0 (2016-03-03)
8035 ==========================
8042 * [`Path::strip_prefix`] (renamed from relative_from)
8043 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8045 * [`Ipv4Addr::is_loopback`]
8046 * [`Ipv4Addr::is_private`]
8047 * [`Ipv4Addr::is_link_local`]
8048 * [`Ipv4Addr::is_multicast`]
8049 * [`Ipv4Addr::is_broadcast`]
8050 * [`Ipv4Addr::is_documentation`]
8052 * [`Ipv6Addr::is_unspecified`]
8053 * [`Ipv6Addr::is_loopback`]
8054 * [`Ipv6Addr::is_multicast`]
8057 * [`Vec::as_mut_slice`]
8059 * [`String::as_str`]
8060 * [`String::as_mut_str`]
8062 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8064 * `<[T]>::`[`sort_by_key`]
8065 * checked, saturated, and overflowing operations
8066 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8067 * [`i32::saturating_mul`]
8068 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8069 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8070 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8071 * [`u32::saturating_mul`]
8072 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8073 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8074 * and checked, saturated, and overflowing operations for other primitive types
8076 * [`ffi::IntoStringError`]
8077 * [`CString::into_string`]
8078 * [`CString::into_bytes`]
8079 * [`CString::into_bytes_with_nul`]
8080 * `From<CString> for Vec<u8>`
8082 * [`IntoStringError::into_cstring`]
8083 * [`IntoStringError::utf8_error`]
8084 * `Error for IntoStringError`
8086 * [`std::hash::BuildHasher`]
8087 * [`BuildHasher::Hasher`]
8088 * [`BuildHasher::build_hasher`]
8089 * [`std::hash::BuildHasherDefault`]
8090 * [`HashMap::with_hasher`]
8091 * [`HashMap::with_capacity_and_hasher`]
8092 * [`HashSet::with_hasher`]
8093 * [`HashSet::with_capacity_and_hasher`]
8094 * [`std::collections::hash_map::RandomState`]
8095 * [`RandomState::new`]
8096 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8097 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8098 from bytes is faster.
8099 * [The performance of `LineWriter` (and thus `io::stdout`) was
8100 improved by using `memchr` to search for newlines][1.7m].
8101 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8102 `f64` variants were stabilized previously.
8103 * [`BTreeMap` was rewritten to use less memory and improve the performance
8104 of insertion and iteration, the latter by as much as 5x][1.7bm].
8105 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8106 covariant over their contained type][1.7bt].
8107 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8108 over their contained type][1.7ll].
8109 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8111 * [`Any` is implemented for unsized types][1.7a].
8112 * [`Hash` is implemented for `Duration`][1.7h].
8117 * [When running tests with `--test`, rustdoc will pass `--cfg`
8118 arguments to the compiler][1.7dt].
8119 * [The compiler is built with RPATH information by default][1.7rpa].
8120 This means that it will be possible to run `rustc` when installed in
8121 unusual configurations without configuring the dynamic linker search
8123 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8124 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8125 over `LD_LIBRARY_PATH`.
8130 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8131 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8132 * [The `rerun-if-changed` build script directive no longer causes the
8133 build script to incorrectly run twice in certain scenarios][1.7rr].
8138 * Soundness fixes to the interactions between associated types and
8139 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8140 code that violates the new rules. This is a significant change that
8141 is known to break existing code, so it has emitted warnings for the
8142 new error cases since 1.4 to give crate authors time to adapt. The
8143 details of what is changing are subtle; read the RFC for more.
8144 * [Several bugs in the compiler's visibility calculations were
8145 fixed][1.7v]. Since this was found to break significant amounts of
8146 code, the new errors will be emitted as warnings for several release
8147 cycles, under the `private_in_public` lint.
8148 * Defaulted type parameters were accidentally accepted in positions
8149 that were not intended. In this release, [defaulted type parameters
8150 appearing outside of type definitions will generate a
8151 warning][1.7d], which will become an error in future releases.
8152 * [Parsing "." as a float results in an error instead of 0][1.7p].
8153 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8154 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8156 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8157 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8158 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8159 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8160 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8161 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8162 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8163 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8164 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8165 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8166 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8167 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8168 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8169 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8170 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8171 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8172 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8173 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8174 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8175 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8176 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8177 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8178 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8179 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8180 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8181 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8182 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8183 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8184 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8185 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8186 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8187 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8188 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8189 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8190 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8191 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8192 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8193 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8194 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8195 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8196 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8197 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8198 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8199 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8200 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8201 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8202 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8203 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8204 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8205 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8206 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8207 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8208 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8209 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8210 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8211 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8212 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8213 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8214 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8215 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8216 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8217 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8218 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8219 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8220 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8221 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8222 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8223 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8224 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8225 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8226 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8227 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8228 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8229 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8230 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8231 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8232 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8233 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8234 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8237 Version 1.6.0 (2016-01-21)
8238 ==========================
8243 * The `#![no_std]` attribute causes a crate to not be linked to the
8244 standard library, but only the [core library][1.6co], as described
8245 in [RFC 1184]. The core library defines common types and traits but
8246 has no platform dependencies whatsoever, and is the basis for Rust
8247 software in environments that cannot support a full port of the
8248 standard library, such as operating systems. Most of the core
8249 library is now stable.
8255 [`Read::read_exact`],
8256 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8257 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8258 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8259 [`os::unix::fs::DirBuilderExt`],
8260 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8261 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8262 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8263 [`collections::hash_map::Drain`],
8264 [`collections::hash_map::HashMap::drain`],
8265 [`collections::hash_set::Drain`],
8266 [`collections::hash_set::HashSet::drain`],
8267 [`collections::binary_heap::Drain`],
8268 [`collections::binary_heap::BinaryHeap::drain`],
8269 [`Vec::extend_from_slice`] (renamed from `push_all`),
8270 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8271 [`RwLock::into_inner`],
8272 [`Iterator::min_by_key`] (renamed from `min_by`),
8273 [`Iterator::max_by_key`] (renamed from `max_by`).
8274 * The [core library][1.6co] is stable, as are most of its APIs.
8275 * [The `assert_eq!` macro supports arguments that don't implement
8276 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8278 * Several timer functions that take duration in milliseconds [are
8279 deprecated in favor of those that take `Duration`][1.6ms]. These
8280 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8281 `thread::park_timeout_ms`.
8282 * The algorithm by which `Vec` reserves additional elements was
8283 [tweaked to not allocate excessive space][1.6a] while still growing
8285 * `From` conversions are [implemented from integers to floats][1.6f]
8286 in cases where the conversion is lossless. Thus they are not
8287 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8288 or `f64`. They are also not implemented for `isize` and `usize`
8289 because the implementations would be platform-specific. `From` is
8290 also implemented from `f32` to `f64`.
8291 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8292 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8293 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8294 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8296 * Sorting slices that are already sorted [is 50% faster in some
8302 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8303 * Cargo build scripts can specify their dependencies by emitting the
8304 [`rerun-if-changed`][1.6rr] key.
8305 * crates.io will reject publication of crates with dependencies that
8306 have a wildcard version constraint. Crates with wildcard
8307 dependencies were seen to cause a variety of problems, as described
8308 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8310 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8311 release folder. A variety of artifacts that Cargo failed to clean
8312 are now correctly deleted.
8317 * The `unreachable_code` lint [warns when a function call's argument
8319 * The parser indicates [failures that may be caused by
8320 confusingly-similar Unicode characters][1.6uc]
8321 * Certain macro errors [are reported at definition time][1.6m], not
8327 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8328 environment variable when locating crates. This was a pre-cargo
8329 feature for integrating with the package manager that was
8330 accidentally never removed.
8331 * [A number of bugs were fixed in the privacy checker][1.6p] that
8332 could cause previously-accepted code to break.
8333 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8334 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8335 struct pattern syntax (`Foo(..)`) can no longer be used to match
8336 unit structs. This is a warning now, but will become an error in
8337 future releases. Patterns that share the same name as a const are
8339 * A bug was fixed that causes [rustc not to apply default type
8340 parameters][1.6xc] when resolving certain method implementations of
8341 traits defined in other crates.
8343 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8344 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8345 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8346 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8347 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8348 [1.6co]: http://doc.rust-lang.org/core/index.html
8349 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8350 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8351 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8352 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8353 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8354 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8355 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8356 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8357 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8358 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8359 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8360 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8361 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8362 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8363 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8364 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8365 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8366 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8367 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8368 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8369 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8370 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8371 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8372 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8373 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8374 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8375 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8376 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8377 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8378 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8379 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8380 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8381 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8382 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8383 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8384 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8385 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8386 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8387 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8388 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8389 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8392 Version 1.5.0 (2015-12-10)
8393 ==========================
8395 * ~700 changes, numerous bugfixes
8401 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8402 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8403 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8404 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8405 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8406 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8407 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8408 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8409 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8410 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8411 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8412 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8413 [`Path::read_link`], [`Path::symlink_metadata`],
8414 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8415 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8416 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8417 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8418 [`slice::split_first_mut`], [`slice::split_first`],
8419 [`slice::split_last_mut`], [`slice::split_last`],
8420 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8421 [`str::MatchIndices`], [`str::RMatchIndices`],
8422 [`str::match_indices`], [`str::rmatch_indices`],
8423 [`str::slice_mut_unchecked`], [`string::ParseError`].
8424 * Rust applications hosted on crates.io can be installed locally to
8425 `~/.cargo/bin` with the [`cargo install`] command. Among other
8426 things this makes it easier to augment Cargo with new subcommands:
8427 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8428 invoked as `cargo foo`.
8429 * Crates with wildcard (`*`) dependencies will [emit warnings when
8430 published][1.5w]. In 1.6 it will no longer be possible to publish
8431 crates with wildcard dependencies.
8436 * The rules determining when a particular lifetime must outlive
8437 a particular value (known as '[dropck]') have been [modified
8438 to not rely on parametricity][1.5p].
8439 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8440 and `Arc`][1.5a]. Because these smart pointer types implement
8441 `Deref`, this causes breakage in cases where the interior type
8442 contains methods of the same name.
8443 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8444 that they could drop their content. Soundness fix.
8445 * All method invocations are [properly checked][1.5wf1] for
8446 [well-formedness][1.5wf2]. Soundness fix.
8447 * Traits whose supertraits contain `Self` are [not object
8448 safe][1.5o]. Soundness fix.
8449 * Target specifications support a [`no_default_libraries`][1.5nd]
8450 setting that controls whether `-nodefaultlibs` is passed to the
8451 linker, and in turn the `is_like_windows` setting no longer affects
8452 the `-nodefaultlibs` flag.
8453 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8454 * The `#[inline]` and `#[repr]` attributes [can only appear
8455 in valid locations][1.5at].
8456 * Native libraries linked from the local crate are [passed to
8457 the linker before native libraries from upstream crates][1.5nl].
8458 * Two rarely-used attributes, `#[no_debug]` and
8459 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8460 * Negation of unsigned integers, which has been a warning for
8461 several releases, [is now behind a feature gate and will
8462 generate errors][1.5nu].
8463 * The parser accidentally accepted visibility modifiers on
8464 enum variants, a bug [which has been fixed][1.5ev].
8465 * [A bug was fixed that allowed `use` statements to import unstable
8471 * When evaluating expressions at compile-time that are not
8472 compile-time constants (const-evaluating expressions in non-const
8473 contexts), incorrect code such as overlong bitshifts and arithmetic
8474 overflow will [generate a warning instead of an error][1.5ce],
8475 delaying the error until runtime. This will allow the
8476 const-evaluator to be expanded in the future backwards-compatibly.
8477 * The `improper_ctypes` lint [no longer warns about using `isize` and
8478 `usize` in FFI][1.5ict].
8483 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8485 * `Default` is [implemented for mutable slices][1.5d].
8486 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8487 * There are now `From` conversions [between floating point
8488 types][1.5f] where the conversions are lossless.
8489 * There are now `From` conversions [between integer types][1.5i] where
8490 the conversions are lossless.
8491 * [`fs::Metadata` implements `Clone`][1.5fs].
8492 * The `parse` method [accepts a leading "+" when parsing
8494 * [`AsMut` is implemented for `Vec`][1.5am].
8495 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8496 been optimized][1.5cf] and no longer rely on the default impl.
8497 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8498 `unsafe extern "C"` function types now [implement `Clone`,
8499 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8500 `fmt::Debug` for up to 12 arguments][1.5fp].
8501 * [Dropping `Vec`s is much faster in unoptimized builds when the
8502 element types don't implement `Drop`][1.5dv].
8503 * A bug that caused in incorrect behavior when [combining `VecDeque`
8504 with zero-sized types][1.5vdz] was resolved.
8505 * [`PartialOrd` for slices is faster][1.5po].
8510 * [Crate metadata size was reduced by 20%][1.5md].
8511 * [Improvements to code generation reduced the size of libcore by 3.3
8512 MB and rustc's memory usage by 18MB][1.5m].
8513 * [Improvements to deref translation increased performance in
8514 unoptimized builds][1.5dr].
8515 * Various errors in trait resolution [are deduplicated to only be
8516 reported once][1.5te].
8517 * Rust has preliminary [support for rumprun kernels][1.5rr].
8518 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8520 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8521 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8522 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8523 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8524 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8525 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8526 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8527 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8528 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8529 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8530 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8531 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8532 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8533 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8534 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8535 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8536 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8537 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8538 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8539 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8540 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8541 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8542 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8543 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8544 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8545 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8546 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8547 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8548 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8549 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8550 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8551 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8552 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8553 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8554 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8555 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8556 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8557 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8558 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8559 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8560 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8561 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8562 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8563 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8564 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8565 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8566 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8567 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8568 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8569 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8570 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8571 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8572 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8573 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8574 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8575 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8576 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8577 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8578 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8579 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8580 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8581 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8582 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8583 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8584 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8585 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8586 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8587 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8588 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8589 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8590 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8591 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8592 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8593 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8594 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8595 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8596 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8597 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8598 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8599 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8600 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8601 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8602 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8603 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8604 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8605 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8606 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8607 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8608 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8610 Version 1.4.0 (2015-10-29)
8611 ==========================
8613 * ~1200 changes, numerous bugfixes
8618 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8619 GNU) are now supported and recommended for use.
8624 * [Several changes have been made to fix type soundness and improve
8625 the behavior of associated types][sound]. See [RFC 1214]. Although
8626 we have mostly introduced these changes as warnings this release, to
8627 become errors next release, there are still some scenarios that will
8628 see immediate breakage.
8629 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8630 line breaks in addition to `\n`][crlf].
8631 * [Loans of `'static` lifetime extend to the end of a function][stat].
8632 * [`str::parse` no longer introduces avoidable rounding error when
8633 parsing floating point numbers. Together with earlier changes to
8634 float formatting/output, "round trips" like f.to_string().parse()
8635 now preserve the value of f exactly. Additionally, leading plus
8636 signs are now accepted][fp3].
8642 * `use` statements that import multiple items [can now rename
8643 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8644 * [Binops work correctly on fat pointers][binfat].
8645 * `pub extern crate`, which does not behave as expected, [issues a
8646 warning][pec] until a better solution is found.
8651 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8652 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8653 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8654 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8655 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8656 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8657 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8658 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8659 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8660 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8661 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8662 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8663 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8664 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8665 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8666 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8667 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8668 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8670 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8671 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8672 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8673 `f64::from_str_radix`.
8674 * [Reverse-searching strings is faster with the 'two-way'
8676 * [`std::io::copy` allows `?Sized` arguments][cc].
8677 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8678 [override `count`, `nth` and `last` with an *O*(1)
8679 implementation][it].
8680 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8681 * [`IntoRawFd` has been added to the Unix-specific prelude,
8682 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8684 * [`Extend<String>` and `FromIterator<String` are both implemented for
8686 * [`IntoIterator` is implemented for references to `Option` and
8688 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8689 Copy`][ext] as part of [RFC 839]. This will cause type inference
8690 breakage in rare situations.
8691 * [`BinaryHeap` implements `Debug`][bh2].
8692 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8694 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8695 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8696 * [String comparison is faster][faststr].
8697 * `&mut T` where `T: std::fmt::Write` [also implements
8698 `std::fmt::Write`][mutw].
8699 * [A stable regression in `VecDeque::push_back` and other
8700 capacity-altering methods that caused panics for zero-sized types
8702 * [Function pointers implement traits for up to 12 parameters][fp2].
8707 * The compiler [no longer uses the 'morestack' feature to prevent
8708 stack overflow][mm]. Instead it uses guard pages and stack
8709 probes (though stack probes are not yet implemented on any platform
8711 * [The compiler matches traits faster when projections are involved][p].
8712 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8714 * [Cargo now displays useful information about what its doing during
8715 `cargo update`][cu].
8717 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8718 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8719 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8720 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8721 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8722 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8723 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8724 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8725 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8726 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8727 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8728 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8729 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8730 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8731 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8732 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8733 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8734 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8735 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8736 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8737 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8738 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8739 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8740 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8741 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8742 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8743 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8744 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8745 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8746 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8747 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8748 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8749 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8750 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8751 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8752 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8753 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8754 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8755 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8756 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8757 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8758 [bh2]: https://github.com/rust-lang/rust/pull/28156
8759 [binfat]: https://github.com/rust-lang/rust/pull/28270
8760 [bm]: https://github.com/rust-lang/rust/pull/28197
8761 [cc]: https://github.com/rust-lang/rust/pull/27531
8762 [crlf]: https://github.com/rust-lang/rust/pull/28034
8763 [cu]: https://github.com/rust-lang/cargo/pull/1931
8764 [d]: https://github.com/rust-lang/rust/pull/27825
8765 [dep]: https://github.com/rust-lang/rust/pull/28339
8766 [es]: https://github.com/rust-lang/rust/pull/27956
8767 [ext]: https://github.com/rust-lang/rust/pull/28094
8768 [faststr]: https://github.com/rust-lang/rust/pull/28338
8769 [ffi]: https://github.com/rust-lang/rust/pull/28779
8770 [fp]: https://github.com/rust-lang/rust/pull/28268
8771 [fp2]: https://github.com/rust-lang/rust/pull/28560
8772 [fp3]: https://github.com/rust-lang/rust/pull/27307
8773 [i]: https://github.com/rust-lang/rust/pull/27451
8774 [into2]: https://github.com/rust-lang/rust/pull/28039
8775 [it]: https://github.com/rust-lang/rust/pull/27652
8776 [mm]: https://github.com/rust-lang/rust/pull/27338
8777 [mutw]: https://github.com/rust-lang/rust/pull/28368
8778 [sound]: https://github.com/rust-lang/rust/pull/27641
8779 [p]: https://github.com/rust-lang/rust/pull/27866
8780 [pec]: https://github.com/rust-lang/rust/pull/28486
8781 [pr]: https://github.com/rust-lang/rust/pull/27896
8782 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8783 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8784 [s]: https://github.com/rust-lang/rust/pull/27474
8785 [stab]: https://github.com/rust-lang/rust/pull/28339
8786 [stat]: https://github.com/rust-lang/rust/pull/28321
8787 [vd]: https://github.com/rust-lang/rust/pull/28494
8789 Version 1.3.0 (2015-09-17)
8790 ==============================
8792 * ~900 changes, numerous bugfixes
8797 * The [new object lifetime defaults][nold] have been [turned
8798 on][nold2] after a cycle of warnings about the change. Now types
8799 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8800 being interpreted as `&'a Box<Trait+'a>` to `&'a
8801 Box<Trait+'static>`.
8802 * [The Rustonomicon][nom] is a new book in the official documentation
8803 that dives into writing unsafe Rust.
8804 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8805 timekeeping is employed by other std APIs, as well as out-of-tree
8811 * The [new object lifetime defaults][nold] have been [turned
8812 on][nold2] after a cycle of warnings about the change.
8813 * There is a known [regression][lr] in how object lifetime elision is
8814 interpreted, the proper solution for which is undetermined.
8815 * The `#[prelude_import]` attribute, an internal implementation
8816 detail, was accidentally stabilized previously. [It has been put
8817 behind the `prelude_import` feature gate][pi]. This change is
8818 believed to break no existing code.
8819 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8820 [more sane for dynamically sized types][dst3]. Code that relied on
8821 the previous behavior is thought to be broken.
8822 * The `dropck` rules, which checks that destructors can't access
8823 destroyed values, [have been updated][dropck] to match the
8824 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8825 cause some previously-compiling code to no longer build.
8830 * The [new object lifetime defaults][nold] have been [turned
8831 on][nold2] after a cycle of warnings about the change.
8832 * Semicolons may [now follow types and paths in
8833 macros](https://github.com/rust-lang/rust/pull/27000).
8834 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8835 [more sane for dynamically sized types][dst3]. Code that relied on
8836 the previous behavior is not known to exist, and suspected to be
8838 * `'static` variables [may now be recursive][st].
8839 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8840 implementations correctly.
8841 * The `dropck` rules, which checks that destructors can't access
8842 destroyed values, [have been updated][dropck] to match the
8848 * The [`Duration`] API, [has been stabilized][ds], as well as the
8849 `std::time` module, which presently contains only `Duration`.
8850 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8851 * The owned C string, [`CString`], implements [`Borrow`] and the
8852 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8853 these allow C strings to be borrowed and cloned in generic code.
8854 * [`CStr`] implements [`Debug`].
8855 * [`AtomicPtr`] implements [`Debug`].
8856 * [`Error`] trait objects [can be downcast to their concrete types][e]
8857 in many common configurations, using the [`is`], [`downcast`],
8858 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8860 * Searching for substrings now [employs the two-way algorithm][search]
8861 instead of doing a naive search. This gives major speedups to a
8862 number of methods, including [`contains`][sc], [`find`][sf],
8863 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8864 [`ends_with`][sew] are also faster.
8865 * The performance of `PartialEq` for slices is [much faster][ps].
8866 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8867 is overridden and optimized by the implementations for scalars.
8868 * The [`Hasher`] trait now has a number of specialized `write_*`
8869 methods for primitive types, for efficiency.
8870 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8871 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8872 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8873 of [`std::error::Error::cause`][iec] also delegates to the inner
8875 * [`process::Child`][pc] gained the [`id`] method, which returns a
8876 `u32` representing the platform-specific process identifier.
8877 * The [`connect`] method on slices is deprecated, replaced by the new
8878 [`join`] method (note that both of these are on the *unstable*
8879 [`SliceConcatExt`] trait, but through the magic of the prelude are
8880 available to stable code anyway).
8881 * The [`Div`] operator is implemented for [`Wrapping`] types.
8882 * [`DerefMut` is implemented for `String`][dms].
8883 * Performance of SipHash (the default hasher for `HashMap`) is
8884 [better for long data][sh].
8885 * [`AtomicPtr`] implements [`Send`].
8886 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8887 are now [specialized to use uninitialized buffers for increased
8889 * Lifetime parameters of foreign functions [are now resolved
8895 * Rust can now, with some coercion, [produce programs that run on
8896 Windows XP][xp], though XP is not considered a supported platform.
8897 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8898 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8899 recommended for use in 1.3, though should be fully-functional
8900 in the [64-bit 1.4 beta][b14].
8901 * On Fedora-based systems installation will [properly configure the
8902 dynamic linker][fl].
8903 * The compiler gained many new extended error descriptions, which can
8904 be accessed with the `--explain` flag.
8905 * The `dropck` pass, which checks that destructors can't access
8906 destroyed values, [has been rewritten][27261]. This fixes some
8907 soundness holes, and as such will cause some previously-compiling
8908 code to no longer build.
8909 * `rustc` now uses [LLVM to write archive files where possible][ar].
8910 Eventually this will eliminate the compiler's dependency on the ar
8912 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
8913 supported FreeBSD on x86_64).
8914 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8915 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8917 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8918 will kill the process instead of leaking][nlp].
8920 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8921 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8922 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8923 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8924 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8925 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8926 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8927 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8928 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8929 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8930 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8931 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8932 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8933 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8934 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8935 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8936 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8937 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8938 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8939 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8940 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8941 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8942 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8943 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8944 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8945 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8946 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8947 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8948 [ar]: https://github.com/rust-lang/rust/pull/26926
8949 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8950 [dms]: https://github.com/rust-lang/rust/pull/26241
8951 [27261]: https://github.com/rust-lang/rust/pull/27261
8952 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8953 [ds]: https://github.com/rust-lang/rust/pull/26818
8954 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8955 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8956 [dst3]: https://github.com/rust-lang/rust/pull/27351
8957 [e]: https://github.com/rust-lang/rust/pull/24793
8958 [f]: https://github.com/rust-lang/rust/pull/26588
8959 [26959]: https://github.com/rust-lang/rust/pull/26959
8960 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8961 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8962 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8963 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8964 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8965 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8966 [lic]: https://github.com/rust-lang/rust/pull/26583
8967 [lnu]: https://github.com/rust-lang/rust/pull/27026
8968 [lr]: https://github.com/rust-lang/rust/issues/27248
8969 [lum]: https://github.com/rust-lang/rust/pull/26378
8970 [lur]: https://github.com/rust-lang/rust/pull/26783
8971 [nlp]: https://github.com/rust-lang/rust/pull/27176
8972 [nold2]: https://github.com/rust-lang/rust/pull/27045
8973 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8974 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8975 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8976 [pi]: https://github.com/rust-lang/rust/pull/26699
8977 [ps]: https://github.com/rust-lang/rust/pull/26884
8978 [rte]: https://github.com/rust-lang/rust/pull/26950
8979 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8980 [search]: https://github.com/rust-lang/rust/pull/26327
8981 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8982 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8983 [sh]: https://github.com/rust-lang/rust/pull/27280
8984 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8985 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8986 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8987 [st]: https://github.com/rust-lang/rust/pull/26630
8988 [win1]: https://github.com/rust-lang/rust/pull/26569
8989 [win2]: https://github.com/rust-lang/rust/pull/26741
8990 [win3]: https://github.com/rust-lang/rust/pull/26741
8991 [win4]: https://github.com/rust-lang/rust/pull/27210
8992 [xp]: https://github.com/rust-lang/rust/pull/26569
8994 Version 1.2.0 (2015-08-07)
8995 ==========================
8997 * ~1200 changes, numerous bugfixes
9002 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9003 like `Rc` to contain types without a fixed size, arrays and trait
9004 objects, finally enabling use of `Rc<[T]>` and completing the
9005 implementation of DST.
9006 * [Parallel codegen][parcodegen] is now working again, which can
9007 substantially speed up large builds in debug mode; It also gets
9008 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9009 jobs). It's not enabled by default, but will be "in the near
9010 future". It can be activated with the `-C codegen-units=N` flag to
9012 * This is the first release with [experimental support for linking
9013 with the MSVC linker and lib C on Windows (instead of using the GNU
9014 variants via MinGW)][win]. It is yet recommended only for the most
9015 intrepid Rustaceans.
9016 * Benchmark compilations are showing a 30% improvement in
9017 bootstrapping over 1.1.
9022 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9023 unicode case mapping, which is a previously-planned change in
9024 behavior and considered a bugfix.
9025 * [`mem::align_of`] now specifies [the *minimum alignment* for
9026 T][align], which is usually the alignment programs are interested
9027 in, and the same value reported by clang's
9028 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9030 * [The `#[packed]` attribute is no longer silently accepted by the
9031 compiler][packed]. This attribute did nothing and code that
9032 mentioned it likely did not work as intended.
9033 * Associated type defaults are [now behind the
9034 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9035 defaults *did not work*, but could be mentioned syntactically. As
9036 such this breakage has minimal impact.
9041 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9042 matching against dereferenceable values.
9047 * The [`Extend`] trait, which grows a collection from an iterator, is
9048 implemented over iterators of references, for `String`, `Vec`,
9049 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9050 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9051 * The [`iter::once`] function returns an iterator that yields a single
9052 element, and [`iter::empty`] returns an iterator that yields no
9054 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9055 over substring matches.
9056 * [`Cell`] and [`RefCell`] both implement `Eq`.
9057 * A number of methods for wrapping arithmetic are added to the
9058 integral types, [`wrapping_div`], [`wrapping_rem`],
9059 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9060 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9061 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9062 type.. It is illegal for the default arithmetic operations in Rust
9063 to overflow; the desire to wrap must be explicit.
9064 * The `{:#?}` formatting specifier [displays the alternate,
9065 pretty-printed][debugfmt] form of the `Debug` formatter. This
9066 feature was actually introduced prior to 1.0 with little
9068 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9069 for writing data to formatted strings, similar to [`io::Write`].
9070 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9071 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9072 are used by code generators to emit implementations of [`Debug`].
9073 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9074 methods that convert case, following Unicode case mapping.
9075 * It is now easier to handle poisoned locks. The [`PoisonError`]
9076 type, returned by failing lock operations, exposes `into_inner`,
9077 `get_ref`, and `get_mut`, which all give access to the inner lock
9078 guard, and allow the poisoned lock to continue to operate. The
9079 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9080 poisoned lock without attempting to take the lock.
9081 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9082 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9083 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9084 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9086 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9092 * `rustc` employs smarter heuristics for guessing at [typos].
9093 * `rustc` emits more efficient code for [no-op conversions between
9094 unsafe pointers][nop].
9095 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9096 resulting in faster compile times and smaller code.
9098 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9099 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9100 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9101 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9102 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9103 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9104 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9105 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9106 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9107 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9108 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9109 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9110 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9111 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9112 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9113 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9114 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9115 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9116 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9117 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9118 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9119 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9120 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9121 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9122 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9123 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9124 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9125 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9126 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9127 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9128 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9129 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9130 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9131 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9132 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9133 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9134 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9135 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9136 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9137 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9138 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9139 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9140 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9141 [align]: https://github.com/rust-lang/rust/pull/25646
9142 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9143 [typos]: https://github.com/rust-lang/rust/pull/26087
9144 [nop]: https://github.com/rust-lang/rust/pull/26336
9145 [fat]: https://github.com/rust-lang/rust/pull/26411
9146 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9147 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9148 [packed]: https://github.com/rust-lang/rust/pull/25541
9149 [ad]: https://github.com/rust-lang/rust/pull/27382
9150 [win]: https://github.com/rust-lang/rust/pull/25350
9152 Version 1.1.0 (2015-06-25)
9153 =========================
9155 * ~850 changes, numerous bugfixes
9160 * The [`std::fs` module has been expanded][fs] to expand the set of
9161 functionality exposed:
9162 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9163 don't incur a syscall on some platforms.
9164 * A `symlink_metadata` function has been added.
9165 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9166 access to all underlying information.
9167 * The compiler now contains extended explanations of many errors. When an error
9168 with an explanation occurs the compiler suggests using the `--explain` flag
9169 to read the explanation. Error explanations are also [available online][err-index].
9170 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9171 well as other work, the time to bootstrap the compiler decreased by
9177 * The [`str::split_whitespace`] method splits a string on unicode
9178 whitespace boundaries.
9179 * On both Windows and Unix, new extension traits provide conversion of
9180 I/O types to and from the underlying system handles. On Unix, these
9181 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9182 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9183 `TcpListener`, and `UpdSocket`. Further implementations for
9184 `std::process` will be stabilized later.
9185 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9186 Windows, symlinks can be created with
9187 `std::os::windows::symlink_dir` and
9188 `std::os::windows::symlink_file`.
9189 * The `mpsc::Receiver` type can now be converted into an iterator with
9190 `into_iter` on the [`IntoIterator`] trait.
9191 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9192 implementation of the [`From`] trait.
9193 * The `Debug` implementation for `RangeFull` [creates output that is
9194 more consistent with other implementations][rf].
9195 * [`Debug` is implemented for `File`][file].
9196 * The `Default` implementation for `Arc` [no longer requires `Sync +
9198 * [The `Iterator` methods `count`, `nth`, and `last` have been
9199 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9200 * Incorrect handling of paths on Windows has been improved in both the
9201 compiler and the standard library.
9202 * [`AtomicPtr` gained a `Default` implementation][ap].
9203 * In accordance with Rust's policy on arithmetic overflow `abs` now
9204 [panics on overflow when debug assertions are enabled][abs].
9205 * The [`Cloned`] iterator, which was accidentally left unstable for
9206 1.0 [has been stabilized][c].
9207 * The [`Incoming`] iterator, which iterates over incoming TCP
9208 connections, and which was accidentally unnamable in 1.0, [is now
9209 properly exported][inc].
9210 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9211 `sift_up` or `sift_down` panic][bh].
9212 * The [`split_off`] method of `LinkedList` [no longer corrupts
9213 the list in certain scenarios][ll].
9218 * Type checking performance [has improved notably][sk] with
9219 [multiple improvements][pre].
9220 * The compiler [suggests code changes][ch] for more errors.
9221 * rustc and it's build system have experimental support for [building
9222 toolchains against MUSL][m] instead of glibc on Linux.
9223 * The compiler defines the `target_env` cfg value, which is used for
9224 distinguishing toolchains that are otherwise for the same
9225 platform. Presently this is set to `gnu` for common GNU Linux
9226 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9227 * The [`cargo rustc`][crc] command invokes a build with custom flags
9229 * [Android executables are always position independent][pie].
9230 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9231 with `Drop`][24935].
9233 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9234 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9235 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9236 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9237 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9238 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9239 [rf]: https://github.com/rust-lang/rust/pull/24491
9240 [err-index]: https://doc.rust-lang.org/error-index.html
9241 [sk]: https://github.com/rust-lang/rust/pull/24615
9242 [pre]: https://github.com/rust-lang/rust/pull/25323
9243 [file]: https://github.com/rust-lang/rust/pull/24598
9244 [ch]: https://github.com/rust-lang/rust/pull/24683
9245 [arc]: https://github.com/rust-lang/rust/pull/24695
9246 [si]: https://github.com/rust-lang/rust/pull/24701
9247 [ap]: https://github.com/rust-lang/rust/pull/24834
9248 [m]: https://github.com/rust-lang/rust/pull/24777
9249 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9250 [crc]: https://github.com/rust-lang/cargo/pull/1568
9251 [pie]: https://github.com/rust-lang/rust/pull/24953
9252 [abs]: https://github.com/rust-lang/rust/pull/25441
9253 [c]: https://github.com/rust-lang/rust/pull/25496
9254 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9255 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9256 [inc]: https://github.com/rust-lang/rust/pull/25522
9257 [bh]: https://github.com/rust-lang/rust/pull/25856
9258 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9259 [ll]: https://github.com/rust-lang/rust/pull/26022
9260 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9261 [24935]: https://github.com/rust-lang/rust/pull/24935
9263 Version 1.0.0 (2015-05-15)
9264 ========================
9266 * ~1500 changes, numerous bugfixes
9271 * The vast majority of the standard library is now `#[stable]`. It is
9272 no longer possible to use unstable features with a stable build of
9274 * Many popular crates on [crates.io] now work on the stable release
9276 * Arithmetic on basic integer types now [checks for overflow in debug
9282 * Several [restrictions have been added to trait coherence][coh] in
9283 order to make it easier for upstream authors to change traits
9284 without breaking downstream code.
9285 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9286 improve error messages and macro behavior. For example, `0b1234` is
9287 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9288 * Trait bounds [are always invariant][inv], eliminating the need for
9289 the `PhantomFn` and `MarkerTrait` lang items, which have been
9291 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9292 "foo" as bar` syntax has been replaced with `extern crate foo as
9293 bar`, and Cargo now automatically translates "-" in *package* names
9294 to underscore for the crate name.
9295 * [Lifetime shadowing is an error][lt].
9296 * [`Send` no longer implies `'static`][send-rfc].
9297 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9298 `MyType::default()`.
9299 * Primitive types [now have inherent methods][prim-inherent],
9300 obviating the need for extension traits like `SliceExt`.
9301 * Methods with `Self: Sized` in their `where` clause are [considered
9302 object-safe][self-sized], allowing many extension traits like
9303 `IteratorExt` to be merged into the traits they extended.
9304 * You can now [refer to associated types][assoc-where] whose
9305 corresponding trait bounds appear only in a `where` clause.
9306 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9307 like `Send` and `Sync` are now library-defined.
9308 * A [Reflect trait][reflect] was introduced, which means that
9309 downcasting via the `Any` trait is effectively limited to concrete
9310 types. This helps retain the potentially-important "parametricity"
9311 property: generic code cannot behave differently for different type
9312 arguments except in minor ways.
9313 * The `unsafe_destructor` feature is now deprecated in favor of the
9314 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9320 * The `thread_local` module [has been renamed to `std::thread`][th].
9321 * The methods of `IteratorExt` [have been moved to the `Iterator`
9322 trait itself][23300].
9323 * Several traits that implement Rust's conventions for type
9324 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9325 [centralized in the `std::convert` module][con].
9326 * The `FromError` trait [was removed in favor of `From`][fe].
9327 * The basic sleep function [has moved to
9328 `std::thread::sleep_ms`][slp].
9329 * The `splitn` function now takes an `n` parameter that represents the
9330 number of items yielded by the returned iterator [instead of the
9331 number of 'splits'][spl].
9332 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9333 * [Derived implementations of `PartialOrd` now order enums according
9334 to their explicitly-assigned discriminants][po].
9335 * [Methods for searching strings are generic over `Pattern`s][pat],
9336 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9338 * [In method resolution, object methods are resolved before inherent
9340 * [`String::from_str` has been deprecated in favor of the `From` impl,
9341 `String::from`][24517].
9342 * [`io::Error` implements `Sync`][ios].
9343 * [The `words` method on `&str` has been replaced with
9344 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9346 * The new path and IO modules are complete and `#[stable]`. This
9347 was the major library focus for this cycle.
9348 * The path API was [revised][path-normalize] to normalize `.`,
9349 adjusting the tradeoffs in favor of the most common usage.
9350 * A large number of remaining APIs in `std` were also stabilized
9351 during this cycle; about 75% of the non-deprecated API surface
9353 * The new [string pattern API][string-pattern] landed, which makes
9354 the string slice API much more internally consistent and flexible.
9355 * A new set of [generic conversion traits][conversion] replaced
9356 many existing ad hoc traits.
9357 * Generic numeric traits were [completely removed][num-traits]. This
9358 was made possible thanks to inherent methods for primitive types,
9359 and the removal gives maximal flexibility for designing a numeric
9360 hierarchy in the future.
9361 * The `Fn` traits are now related via [inheritance][fn-inherit]
9362 and provide ergonomic [blanket implementations][fn-blanket].
9363 * The `Index` and `IndexMut` traits were changed to
9364 [take the index by value][index-value], enabling code like
9365 `hash_map["string"]` to work.
9366 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9367 `Copy` data is known to be `Clone` as well.
9372 * Many errors now have extended explanations that can be accessed with
9373 the `--explain` flag to `rustc`.
9374 * Many new examples have been added to the standard library
9376 * rustdoc has received a number of improvements focused on completion
9378 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9379 * Much headway was made on ecosystem-wide CI, making it possible
9380 to [compare builds for breakage][ci-compare].
9383 [crates.io]: http://crates.io
9384 [clo]: https://github.com/rust-lang/rust/pull/24034
9385 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9386 [con]: https://github.com/rust-lang/rust/pull/23875
9387 [cr]: https://github.com/rust-lang/rust/pull/23419
9388 [fe]: https://github.com/rust-lang/rust/pull/23879
9389 [23300]: https://github.com/rust-lang/rust/pull/23300
9390 [inv]: https://github.com/rust-lang/rust/pull/23938
9391 [ios]: https://github.com/rust-lang/rust/pull/24133
9392 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9393 [lt]: https://github.com/rust-lang/rust/pull/24057
9394 [meth]: https://github.com/rust-lang/rust/pull/24056
9395 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9396 [po]: https://github.com/rust-lang/rust/pull/24270
9397 [24517]: https://github.com/rust-lang/rust/pull/24517
9398 [slp]: https://github.com/rust-lang/rust/pull/23949
9399 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9400 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9401 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9402 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9403 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9404 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9405 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9406 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9407 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9408 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9409 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9410 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9411 [reflect]: https://github.com/rust-lang/rust/pull/23712
9412 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9413 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9414 [index-value]: https://github.com/rust-lang/rust/pull/23601
9415 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9416 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9417 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9418 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9419 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9420 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9423 Version 1.0.0-alpha.2 (2015-02-20)
9424 =====================================
9426 * ~1300 changes, numerous bugfixes
9430 * The various I/O modules were [overhauled][io-rfc] to reduce
9431 unnecessary abstractions and provide better interoperation with
9432 the underlying platform. The old `io` module remains temporarily
9434 * The standard library now [participates in feature gating][feat],
9435 so use of unstable libraries now requires a `#![feature(...)]`
9436 attribute. The impact of this change is [described on the
9437 forum][feat-forum]. [RFC][feat-rfc].
9441 * `for` loops [now operate on the `IntoIterator` trait][into],
9442 which eliminates the need to call `.iter()`, etc. to iterate
9443 over collections. There are some new subtleties to remember
9444 though regarding what sort of iterators various types yield, in
9445 particular that `for foo in bar { }` yields values from a move
9446 iterator, destroying the original collection. [RFC][into-rfc].
9447 * Objects now have [default lifetime bounds][obj], so you don't
9448 have to write `Box<Trait+'static>` when you don't care about
9449 storing references. [RFC][obj-rfc].
9450 * In types that implement `Drop`, [lifetimes must outlive the
9451 value][drop]. This will soon make it possible to safely
9452 implement `Drop` for types where `#[unsafe_destructor]` is now
9453 required. Read the [gorgeous RFC][drop-rfc] for details.
9454 * The fully qualified <T as Trait>::X syntax lets you set the Self
9455 type for a trait method or associated type. [RFC][ufcs-rfc].
9456 * References to types that implement `Deref<U>` now [automatically
9457 coerce to references][deref] to the dereferenced type `U`,
9458 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9459 should eliminate many unsightly uses of `&*`, as when converting
9460 from references to vectors into references to
9461 slices. [RFC][deref-rfc].
9462 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9463 `|:|`) is obsolete and closure kind is inferred from context.
9464 * [`Self` is a keyword][Self].
9468 * The `Show` and `String` formatting traits [have been
9469 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9470 their related purposes. Automatically getting a string
9471 conversion to use with `format!("{:?}", something_to_debug)` is
9472 now written `#[derive(Debug)]`.
9473 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9474 OsStr}`, provide strings in platform-specific encodings for easier
9475 interop with system APIs. [RFC][osstr-rfc].
9476 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9477 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9478 creating raw pointers.
9482 * Certain long error messages of the form 'expected foo found bar'
9483 are now [split neatly across multiple
9484 lines][multiline]. Examples in the PR.
9485 * On Unix Rust can be [uninstalled][un] by running
9486 `/usr/local/lib/rustlib/uninstall.sh`.
9487 * The `#[rustc_on_unimplemented]` attribute, requiring the
9488 'on_unimplemented' feature, lets rustc [display custom error
9489 messages when a trait is expected to be implemented for a type
9494 * Rust is tested against a [LALR grammar][lalr], which parses
9495 almost all the Rust files that rustc does.
9497 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9498 [close]: https://github.com/rust-lang/rust/pull/21843
9499 [deref]: https://github.com/rust-lang/rust/pull/21351
9500 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9501 [drop]: https://github.com/rust-lang/rust/pull/21972
9502 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9503 [feat]: https://github.com/rust-lang/rust/pull/21248
9504 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9505 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9506 [fmt]: https://github.com/rust-lang/rust/pull/21457
9507 [into]: https://github.com/rust-lang/rust/pull/20790
9508 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9509 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9510 [lalr]: https://github.com/rust-lang/rust/pull/21452
9511 [multiline]: https://github.com/rust-lang/rust/pull/19870
9512 [obj]: https://github.com/rust-lang/rust/pull/22230
9513 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9514 [onun]: https://github.com/rust-lang/rust/pull/20889
9515 [osstr]: https://github.com/rust-lang/rust/pull/21488
9516 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9517 [Self]: https://github.com/rust-lang/rust/pull/22158
9518 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9519 [un]: https://github.com/rust-lang/rust/pull/22256
9522 Version 1.0.0-alpha (2015-01-09)
9523 ==================================
9525 * ~2400 changes, numerous bugfixes
9529 * The language itself is considered feature complete for 1.0,
9530 though there will be many usability improvements and bugfixes
9531 before the final release.
9532 * Nearly 50% of the public API surface of the standard library has
9533 been declared 'stable'. Those interfaces are unlikely to change
9535 * The long-running debate over integer types has been
9536 [settled][ints]: Rust will ship with types named `isize` and
9537 `usize`, rather than `int` and `uint`, for pointer-sized
9538 integers. Guidelines will be rolled out during the alpha cycle.
9539 * Most crates that are not `std` have been moved out of the Rust
9540 distribution into the Cargo ecosystem so they can evolve
9541 separately and don't need to be stabilized as quickly, including
9542 'time', 'getopts', 'num', 'regex', and 'term'.
9543 * Documentation continues to be expanded with more API coverage, more
9544 examples, and more in-depth explanations. The guides have been
9545 consolidated into [The Rust Programming Language][trpl].
9546 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9547 * All official Rust binary installers now come with [Cargo], the
9548 Rust package manager.
9552 * Closures have been [completely redesigned][unboxed] to be
9553 implemented in terms of traits, can now be used as generic type
9554 bounds and thus monomorphized and inlined, or via an opaque
9555 pointer (boxed) as in the old system. The new system is often
9556 referred to as 'unboxed' closures.
9557 * Traits now support [associated types][assoc], allowing families
9558 of related types to be defined together and used generically in
9560 * Enum variants are [namespaced by their type names][enum].
9561 * [`where` clauses][where] provide a more versatile and attractive
9562 syntax for specifying generic bounds, though the previous syntax
9564 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9566 * Rust [no longer has a runtime][rt] of any description, and only
9567 supports OS threads, not green threads.
9568 * At long last, Rust has been overhauled for 'dynamically-sized
9569 types' ([DST]), which integrates 'fat pointers' (object types,
9570 arrays, and `str`) more deeply into the type system, making it
9572 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9573 `..j` that produce range types and which, when combined with the
9574 `Index` operator and multidispatch, leads to a convenient slice
9576 * The new range syntax revealed an ambiguity in the fixed-length
9577 array syntax, so now fixed length arrays [are written `[T;
9579 * The `Copy` trait is no longer implemented automatically. Unsafe
9580 pointers no longer implement `Sync` and `Send` so types
9581 containing them don't automatically either. `Sync` and `Send`
9582 are now 'unsafe traits' so one can "forcibly" implement them via
9583 `unsafe impl` if a type confirms to the requirements for them
9584 even though the internals do not (e.g. structs containing unsafe
9585 pointers like `Arc`). These changes are intended to prevent some
9586 footguns and are collectively known as [opt-in built-in
9587 traits][oibit] (though `Sync` and `Send` will soon become pure
9588 library types unknown to the compiler).
9589 * Operator traits now take their operands [by value][ops], and
9590 comparison traits can use multidispatch to compare one type
9591 against multiple other types, allowing e.g. `String` to be
9592 compared with `&str`.
9593 * `if let` and `while let` are no longer feature-gated.
9594 * Rust has adopted a more [uniform syntax for escaping unicode
9595 characters][unicode].
9596 * `macro_rules!` [has been declared stable][mac]. Though it is a
9597 flawed system it is sufficiently popular that it must be usable
9598 for 1.0. Effort has gone into [future-proofing][mac-future] it
9599 in ways that will allow other macro systems to be developed in
9600 parallel, and won't otherwise impact the evolution of the
9602 * The prelude has been [pared back significantly][prelude] such
9603 that it is the minimum necessary to support the most pervasive
9604 code patterns, and through [generalized where clauses][where]
9605 many of the prelude extension traits have been consolidated.
9606 * Rust's rudimentary reflection [has been removed][refl], as it
9607 incurred too much code generation for little benefit.
9608 * [Struct variants][structvars] are no longer feature-gated.
9609 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9610 known as 'higher-ranked trait bounds', this crucially allows
9611 unboxed closures to work.
9612 * Macros invocations surrounded by parens or square brackets and
9613 not terminated by a semicolon are [parsed as
9614 expressions][macros], which makes expressions like `vec![1i32,
9615 2, 3].len()` work as expected.
9616 * Trait objects now implement their traits automatically, and
9617 traits that can be coerced to objects now must be [object
9619 * Automatically deriving traits is now done with `#[derive(...)]`
9620 not `#[deriving(...)]` for [consistency with other naming
9621 conventions][derive].
9622 * Importing the containing module or enum at the same time as
9623 items or variants they contain is [now done with `self` instead
9624 of `mod`][self], as in use `foo::{self, bar}`
9625 * Glob imports are no longer feature-gated.
9626 * The `box` operator and `box` patterns have been feature-gated
9627 pending a redesign. For now unique boxes should be allocated
9628 like other containers, with `Box::new`.
9632 * A [series][coll1] of [efforts][coll2] to establish
9633 [conventions][coll3] for collections types has resulted in API
9634 improvements throughout the standard library.
9635 * New [APIs for error handling][err] provide ergonomic interop
9636 between error types, and [new conventions][err-conv] describe
9637 more clearly the recommended error handling strategies in Rust.
9638 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9639 it is easier to discuss failure in the context of error handling
9640 without making clarifications as to whether you are referring to
9641 the 'fail' macro or failure more generally.
9642 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9643 syscall when available.
9644 * The 'serialize' crate has been renamed 'rustc-serialize' and
9645 moved out of the distribution to Cargo. Although it is widely
9646 used now, it is expected to be superseded in the near future.
9647 * The `Show` formatter, typically implemented with
9648 `#[derive(Show)]` is [now requested with the `{:?}`
9649 specifier][show] and is intended for use by all types, for uses
9650 such as `println!` debugging. The new `String` formatter must be
9651 implemented by hand, uses the `{}` specifier, and is intended
9652 for full-fidelity conversions of things that can logically be
9653 represented as strings.
9657 * [Flexible target specification][flex] allows rustc's code
9658 generation to be configured to support otherwise-unsupported
9660 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9661 respective debuggers with Rust-appropriate pretty-printing.
9662 * The Windows installation of Rust is distributed with the
9663 MinGW components currently required to link binaries on that
9668 * Nullable enum optimizations have been extended to more types so
9669 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9670 space than the inner types themselves.
9671 * Work has begun on supporting AArch64.
9673 [Cargo]: https://crates.io
9674 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9675 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9676 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9677 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9678 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9679 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9680 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9681 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9682 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9683 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9684 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9685 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9686 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9687 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9688 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9689 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9690 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9691 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9692 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9693 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9694 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9695 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9696 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9697 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9698 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9699 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9700 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9701 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9702 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9703 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9704 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9705 [trpl]: https://doc.rust-lang.org/book/index.html
9706 [rbe]: http://rustbyexample.com/
9709 Version 0.12.0 (2014-10-09)
9710 =============================
9712 * ~1900 changes, numerous bugfixes
9716 * The introductory documentation (now called The Rust Guide) has
9717 been completely rewritten, as have a number of supplementary
9719 * Rust's package manager, Cargo, continues to improve and is
9720 sometimes considered to be quite awesome.
9721 * Many API's in `std` have been reviewed and updated for
9722 consistency with the in-development Rust coding
9723 guidelines. The standard library documentation tracks
9724 stabilization progress.
9725 * Minor libraries have been moved out-of-tree to the rust-lang org
9726 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9727 be installed with Cargo.
9728 * Lifetime elision allows lifetime annotations to be left off of
9729 function declarations in many common scenarios.
9730 * Rust now works on 64-bit Windows.
9733 * Indexing can be overloaded with the `Index` and `IndexMut`
9735 * The `if let` construct takes a branch only if the `let` pattern
9736 matches, currently behind the 'if_let' feature gate.
9737 * 'where clauses', a more flexible syntax for specifying trait
9738 bounds that is more aesthetic, have been added for traits and
9739 free functions. Where clauses will in the future make it
9740 possible to constrain associated types, which would be
9741 impossible with the existing syntax.
9742 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9743 the 'slicing_syntax' feature gate, and can be overloaded with
9744 the `Slice` or `SliceMut` traits.
9745 * The syntax for matching of sub-slices has been changed to use a
9746 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9747 consistency with other uses of `..` and to future-proof
9748 potential additional uses of the syntax.
9749 * The syntax for matching inclusive ranges in patterns has changed
9750 from `0..3` to `0...4` to be consistent with the exclusive range
9752 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9753 c]`) has been put behind the 'advanced_slice_patterns' feature
9754 gate and may be removed in the future.
9755 * Components of tuples and tuple structs can be extracted using
9756 the `value.0` syntax, currently behind the `tuple_indexing`
9758 * The `#[crate_id]` attribute is no longer supported; versioning
9759 is handled by the package manager.
9760 * Renaming crate imports are now written `extern crate foo as bar`
9761 instead of `extern crate bar = foo`.
9762 * Renaming use statements are now written `use foo as bar` instead
9764 * `let` and `match` bindings and argument names in macros are now
9766 * The new, more efficient, closure types ('unboxed closures') have
9767 been added under a feature gate, 'unboxed_closures'. These will
9768 soon replace the existing closure types, once higher-ranked
9769 trait lifetimes are added to the language.
9770 * `move` has been added as a keyword, for indicating closures
9771 that capture by value.
9772 * Mutation and assignment is no longer allowed in pattern guards.
9773 * Generic structs and enums can now have trait bounds.
9774 * The `Share` trait is now called `Sync` to free up the term
9775 'shared' to refer to 'shared reference' (the default reference
9777 * Dynamically-sized types have been mostly implemented,
9778 unifying the behavior of fat-pointer types with the rest of the
9780 * As part of dynamically-sized types, the `Sized` trait has been
9781 introduced, which qualifying types implement by default, and
9782 which type parameters expect by default. To specify that a type
9783 parameter does not need to be sized, write `<Sized? T>`. Most
9784 types are `Sized`, notable exceptions being unsized arrays
9785 (`[T]`) and trait types.
9786 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9787 * Lifetime bounds can now be applied to type parameters and object
9789 * The old, reference counted GC type, `Gc<T>` which was once
9790 denoted by the `@` sigil, has finally been removed. GC will be
9791 revisited in the future.
9794 * Library documentation has been improved for a number of modules.
9795 * Bit-vectors, collections::bitv has been modernized.
9796 * The url crate is deprecated in favor of
9797 http://github.com/servo/rust-url, which can be installed with
9799 * Most I/O stream types can be cloned and subsequently closed from
9801 * A `std::time::Duration` type has been added for use in I/O
9802 methods that rely on timers, as well as in the 'time' crate's
9803 `Timespec` arithmetic.
9804 * The runtime I/O abstraction layer that enabled the green thread
9805 scheduler to do non-thread-blocking I/O has been removed, along
9806 with the libuv-based implementation employed by the green thread
9807 scheduler. This will greatly simplify the future I/O work.
9808 * `collections::btree` has been rewritten to have a more
9809 idiomatic and efficient design.
9812 * rustdoc output now indicates the stability levels of API's.
9813 * The `--crate-name` flag can specify the name of the crate
9814 being compiled, like `#[crate_name]`.
9815 * The `-C metadata` specifies additional metadata to hash into
9816 symbol names, and `-C extra-filename` specifies additional
9817 information to put into the output filename, for use by the
9818 package manager for versioning.
9819 * debug info generation has continued to improve and should be
9820 more reliable under both gdb and lldb.
9821 * rustc has experimental support for compiling in parallel
9822 using the `-C codegen-units` flag.
9823 * rustc no longer encodes rpath information into binaries by
9827 * Stack usage has been optimized with LLVM lifetime annotations.
9828 * Official Rust binaries on Linux are more compatible with older
9829 kernels and distributions, built on CentOS 5.10.
9832 Version 0.11.0 (2014-07-02)
9833 ==========================
9835 * ~1700 changes, numerous bugfixes
9838 * ~[T] has been removed from the language. This type is superseded by
9840 * ~str has been removed from the language. This type is superseded by
9842 * ~T has been removed from the language. This type is superseded by the
9844 * @T has been removed from the language. This type is superseded by the
9845 standard library's std::gc::Gc<T> type.
9846 * Struct fields are now all private by default.
9847 * Vector indices and shift amounts are both required to be a `uint`
9848 instead of any integral type.
9849 * Byte character, byte string, and raw byte string literals are now all
9850 supported by prefixing the normal literal with a `b`.
9851 * Multiple ABIs are no longer allowed in an ABI string
9852 * The syntax for lifetimes on closures/procedures has been tweaked
9853 slightly: `<'a>|A, B|: 'b + K -> T`
9854 * Floating point modulus has been removed from the language; however it
9855 is still provided by a library implementation.
9856 * Private enum variants are now disallowed.
9857 * The `priv` keyword has been removed from the language.
9858 * A closure can no longer be invoked through a &-pointer.
9859 * The `use foo, bar, baz;` syntax has been removed from the language.
9860 * The transmute intrinsic no longer works on type parameters.
9861 * Statics now allow blocks/items in their definition.
9862 * Trait bounds are separated from objects with + instead of : now.
9863 * Objects can no longer be read while they are mutably borrowed.
9864 * The address of a static is now marked as insignificant unless the
9865 #[inline(never)] attribute is placed it.
9866 * The #[unsafe_destructor] attribute is now behind a feature gate.
9867 * Struct literals are no longer allowed in ambiguous positions such as
9868 if, while, match, and for..in.
9869 * Declaration of lang items and intrinsics are now feature-gated by
9871 * Integral literals no longer default to `int`, and floating point
9872 literals no longer default to `f64`. Literals must be suffixed with an
9873 appropriate type if inference cannot determine the type of the
9875 * The Box<T> type is no longer implicitly borrowed to &mut T.
9876 * Procedures are now required to not capture borrowed references.
9879 * The standard library is now a "facade" over a number of underlying
9880 libraries. This means that development on the standard library should
9881 be speedier due to smaller crates, as well as a clearer line between
9883 * A new library, libcore, lives under the standard library's facade
9884 which is Rust's "0-assumption" library, suitable for embedded and
9885 kernel development for example.
9886 * A regex crate has been added to the standard distribution. This crate
9887 includes statically compiled regular expressions.
9888 * The unwrap/unwrap_err methods on Result require a Show bound for
9889 better error messages.
9890 * The return types of the std::comm primitives have been centralized
9891 around the Result type.
9892 * A number of I/O primitives have gained the ability to time out their
9894 * A number of I/O primitives have gained the ability to close their
9895 reading/writing halves to cancel pending operations.
9896 * Reverse iterator methods have been removed in favor of `rev()` on
9897 their forward-iteration counterparts.
9898 * A bitflags! macro has been added to enable easy interop with C and
9899 management of bit flags.
9900 * A debug_assert! macro is now provided which is disabled when
9901 `--cfg ndebug` is passed to the compiler.
9902 * A graphviz crate has been added for creating .dot files.
9903 * The std::cast module has been migrated into std::mem.
9904 * The std::local_data api has been migrated from freestanding functions
9905 to being based on methods.
9906 * The Pod trait has been renamed to Copy.
9907 * jemalloc has been added as the default allocator for types.
9908 * The API for allocating memory has been changed to use proper alignment
9909 and sized deallocation
9910 * Connecting a TcpStream or binding a TcpListener is now based on a
9911 string address and a u16 port. This allows connecting to a hostname as
9913 * The Reader trait now contains a core method, read_at_least(), which
9914 correctly handles many repeated 0-length reads.
9915 * The process-spawning API is now centered around a builder-style
9917 * The :? printing qualifier has been moved from the standard library to
9918 an external libdebug crate.
9919 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9920 have been renamed to Eq/Ord.
9921 * The select/plural methods have been removed from format!. The escapes
9922 for { and } have also changed from \{ and \} to {{ and }},
9924 * The TaskBuilder API has been re-worked to be a true builder, and
9925 extension traits for spawning native/green tasks have been added.
9928 * All breaking changes to the language or libraries now have their
9929 commit message annotated with `[breaking-change]` to allow for easy
9930 discovery of breaking changes.
9931 * The compiler will now try to suggest how to annotate lifetimes if a
9932 lifetime-related error occurs.
9933 * Debug info continues to be improved greatly with general bug fixes and
9934 better support for situations like link time optimization (LTO).
9935 * Usage of syntax extensions when cross-compiling has been fixed.
9936 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9937 -fdata-sections and --gc-sections has been enabled by default
9938 * The compiler is now stricter about where it will load module files
9939 from when a module is declared via `mod foo;`.
9940 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9941 Syntax extensions are now discovered via a "plugin registrar" type
9942 which will be extended in the future to other various plugins.
9943 * Lints have been restructured to allow for dynamically loadable lints.
9944 * A number of rustdoc improvements:
9945 * The HTML output has been visually redesigned.
9946 * Markdown is now powered by hoedown instead of sundown.
9947 * Searching heuristics have been greatly improved.
9948 * The search index has been reduced in size by a great amount.
9949 * Cross-crate documentation via `pub use` has been greatly improved.
9950 * Primitive types are now hyperlinked and documented.
9951 * Documentation has been moved from static.rust-lang.org/doc to
9953 * A new sandbox, play.rust-lang.org, is available for running and
9954 sharing rust code examples on-line.
9955 * Unused attributes are now more robustly warned about.
9956 * The dead_code lint now warns about unused struct fields.
9957 * Cross-compiling to iOS is now supported.
9958 * Cross-compiling to mipsel is now supported.
9959 * Stability attributes are now inherited by default and no longer apply
9960 to intra-crate usage, only inter-crate usage.
9961 * Error message related to non-exhaustive match expressions have been
9965 Version 0.10 (2014-04-03)
9966 =========================
9968 * ~1500 changes, numerous bugfixes
9971 * A new RFC process is now in place for modifying the language.
9972 * Patterns with `@`-pointers have been removed from the language.
9973 * Patterns with unique vectors (`~[T]`) have been removed from the
9975 * Patterns with unique strings (`~str`) have been removed from the
9977 * `@str` has been removed from the language.
9978 * `@[T]` has been removed from the language.
9979 * `@self` has been removed from the language.
9980 * `@Trait` has been removed from the language.
9981 * Headers on `~` allocations which contain `@` boxes inside the type for
9982 reference counting have been removed.
9983 * The semantics around the lifetimes of temporary expressions have changed,
9984 see #3511 and #11585 for more information.
9985 * Cross-crate syntax extensions are now possible, but feature gated. See
9986 #11151 for more information. This includes both `macro_rules!` macros as
9987 well as syntax extensions such as `format!`.
9988 * New lint modes have been added, and older ones have been turned on to be
9990 * Unnecessary parentheses
9993 * Uppercase variables
9994 * Publicly visible private types
9995 * `#[deriving]` with raw pointers
9996 * Unsafe functions can no longer be coerced to closures.
9997 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9998 * The `#[simd]` attribute is now behind a feature gate.
9999 * Visibility is no longer allowed on `extern crate` statements, and
10000 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10001 * Trailing commas are now allowed in argument lists and tuple patterns.
10002 * The `do` keyword has been removed, it is now a reserved keyword.
10003 * Default type parameters have been implemented, but are feature gated.
10004 * Borrowed variables through captures in closures are now considered soundly.
10005 * `extern mod` is now `extern crate`
10006 * The `Freeze` trait has been removed.
10007 * The `Share` trait has been added for types that can be shared among
10009 * Labels in macros are now hygienic.
10010 * Expression/statement macro invocations can be delimited with `{}` now.
10011 * Treatment of types allowed in `static mut` locations has been tweaked.
10012 * The `*` and `.` operators are now overloadable through the `Deref` and
10014 * `~Trait` and `proc` no longer have `Send` bounds by default.
10015 * Partial type hints are now supported with the `_` type marker.
10016 * An `Unsafe` type was introduced for interior mutability. It is now
10017 considered undefined to transmute from `&T` to `&mut T` without using the
10019 * The #[linkage] attribute was implemented for extern statics/functions.
10020 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10021 * `Pod` was renamed to `Copy`.
10024 * The `libextra` library has been removed. It has now been decomposed into
10025 component libraries with smaller and more focused nuggets of
10026 functionality. The full list of libraries can be found on the
10027 documentation index page.
10028 * std: `std::condition` has been removed. All I/O errors are now propagated
10029 through the `Result` type. In order to assist with error handling, a
10030 `try!` macro for unwrapping errors with an early return and a lint for
10031 unused results has been added. See #12039 for more information.
10032 * std: The `vec` module has been renamed to `slice`.
10033 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10034 This will become the only growable vector in the future.
10035 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10036 are now found at `std::io::BufferedReader` instead of
10037 `std::io::buffered::BufferedReader`.
10038 * std: `print` and `println` are no longer in the prelude, the `print!` and
10039 `println!` macros are intended to be used instead.
10040 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10041 attempts to statically prevent cycles.
10042 * std: The standard distribution is adopting the policy of pushing failure
10043 to the user rather than failing in libraries. Many functions (such as
10044 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10045 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10046 deriving mode: `#[deriving(Show)]`.
10047 * std: `ToStr` is now implemented for all types implementing `Show`.
10048 * std: The formatting trait methods now take `&self` instead of `&T`
10049 * std: The `invert()` method on iterators has been renamed to `rev()`
10050 * std: `std::num` has seen a reduction in the genericity of its traits,
10051 consolidating functionality into a few core traits.
10052 * std: Backtraces are now printed on task failure if the environment
10053 variable `RUST_BACKTRACE` is present.
10054 * std: Naming conventions for iterators have been standardized. More details
10055 can be found on the wiki's style guide.
10056 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10057 still implement the function.
10058 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10059 * std: `assert_approx_eq!` has been removed
10060 * std: The `e` and `E` formatting specifiers for floats have been added to
10061 print them in exponential notation.
10062 * std: The `Times` trait has been removed
10063 * std: Indications of variance and opting out of builtin bounds is done
10064 through marker types in `std::kinds::marker` now
10065 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10066 `#[deriving(Hash)]` is now possible.
10067 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10068 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10069 * std: `Chan::new` is now `channel()`.
10070 * std: A new synchronous channel type has been implemented.
10071 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10072 * std: `hashmap` and `trie` have been moved to `libcollections`
10073 * std: `run` has been rolled into `io::process`
10074 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10075 * std: The equality and comparison traits have seen some reorganization.
10076 * std: `rand` has moved to `librand`.
10077 * std: `to_{lower,upper}case` has been implemented for `char`.
10078 * std: Logging has been moved to `liblog`.
10079 * collections: `HashMap` has been rewritten for higher performance and less
10081 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10082 it can be booted manually. The runtime guide has more information and
10084 * native: All I/O functionality except signals has been implemented.
10085 * green: Task spawning with `libgreen` has been optimized with stack caching
10086 and various trimming of code.
10087 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10088 * sync: The `extra::sync` module has been updated to modern rust (and moved
10089 to the `sync` library), tweaking and improving various interfaces while
10090 dropping redundant functionality.
10091 * sync: A new `Barrier` type has been added to the `sync` library.
10092 * sync: An efficient mutex for native and green tasks has been implemented.
10093 * serialize: The `base64` module has seen some improvement. It treats
10094 newlines better, has non-string error values, and has seen general
10096 * fourcc: A `fourcc!` macro was introduced
10097 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10098 hexadecimal literal.
10101 * `rustpkg` has been deprecated and removed from the main repository. Its
10102 replacement, `cargo`, is under development.
10103 * Nightly builds of rust are now available
10104 * The memory usage of rustc has been improved many times throughout this
10106 * The build process supports disabling rpath support for the rustc binary
10108 * Code generation has improved in some cases, giving more information to the
10109 LLVM optimization passes to enable more extensive optimizations.
10110 * Debuginfo compatibility with lldb on OSX has been restored.
10111 * The master branch is now gated on an android bot, making building for
10112 android much more reliable.
10113 * Output flags have been centralized into one `--emit` flag.
10114 * Crate type flags have been centralized into one `--crate-type` flag.
10115 * Codegen flags have been consolidated behind a `-C` flag.
10116 * Linking against outdated crates now has improved error messages.
10117 * Error messages with lifetimes will often suggest how to annotate the
10118 function to fix the error.
10119 * Many more types are documented in the standard library, and new guides
10121 * Many `rustdoc` improvements:
10122 * code blocks are syntax highlighted.
10123 * render standalone markdown files.
10124 * the --test flag tests all code blocks by default.
10125 * exported macros are displayed.
10126 * re-exported types have their documentation inlined at the location of the
10128 * search works across crates that have been rendered to the same output
10132 Version 0.9 (2014-01-09)
10133 ==========================
10135 * ~1800 changes, numerous bugfixes
10138 * The `float` type has been removed. Use `f32` or `f64` instead.
10139 * A new facility for enabling experimental features (feature gating) has
10140 been added, using the crate-level `#[feature(foo)]` attribute.
10141 * Managed boxes (@) are now behind a feature gate
10142 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10143 standard library's `Gc` or `Rc` types instead.
10144 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10145 * Jumping back to the top of a loop is now done with `continue` instead of
10147 * Strings can no longer be mutated through index assignment.
10148 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10149 hash delimiters, as in `r###"foo"###`.
10150 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10152 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10153 * `@fn`s have been removed.
10154 * `do` only works with procs in order to make it obvious what the cost
10156 * Single-element tuple-like structs can no longer be dereferenced to
10157 obtain the inner value. A more comprehensive solution for overloading
10158 the dereference operator will be provided in the future.
10159 * The `#[link(...)]` attribute has been replaced with
10160 `#[crate_id = "name#vers"]`.
10161 * Empty `impl`s must be terminated with empty braces and may not be
10162 terminated with a semicolon.
10163 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10164 no longer has any special meaning.
10165 * The old `fmt!` string formatting macro has been removed.
10166 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10167 `print!` and `println!`.
10168 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10169 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10170 `extern mod foo = "bar"` instead.
10171 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10172 * Macros can have attributes.
10173 * Macros can expand to items with attributes.
10174 * Macros can expand to multiple items.
10175 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10176 * Comments may be nested.
10177 * Values automatically coerce to trait objects they implement, without
10179 * Enum discriminants are no longer an entire word but as small as needed to
10180 contain all the variants. The `repr` attribute can be used to override
10181 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10182 `#[repr(C)]` to match C enums.
10183 * Non-string literals are not allowed in attributes (they never worked).
10184 * The FFI now supports variadic functions.
10185 * Octal numeric literals, as in `0o7777`.
10186 * The `concat!` syntax extension performs compile-time string concatenation.
10187 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10188 removed as Rust no longer uses segmented stacks.
10189 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10190 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10191 not `*`; ignoring remaining fields of a struct is also done with `..`,
10192 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10193 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10194 * `rustc` supports the "system" calling convention, which defaults to the
10195 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10197 * The `type_overflow` lint (default: warn) checks literals for overflow.
10198 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10199 * The `attribute_usage` lint (default: warn) warns about unknown
10201 * The `unknown_features` lint (default: warn) warns about unknown
10203 * The `dead_code` lint (default: warn) checks for dead code.
10204 * Rust libraries can be linked statically to one another
10205 * `#[link_args]` is behind the `link_args` feature gate.
10206 * Native libraries are now linked with `#[link(name = "foo")]`
10207 * Native libraries can be statically linked to a rust crate
10208 (`#[link(name = "foo", kind = "static")]`).
10209 * Native OS X frameworks are now officially supported
10210 (`#[link(name = "foo", kind = "framework")]`).
10211 * The `#[thread_local]` attribute creates thread-local (not task-local)
10212 variables. Currently behind the `thread_local` feature gate.
10213 * The `return` keyword may be used in closures.
10214 * Types that can be copied via a memcpy implement the `Pod` kind.
10215 * The `cfg` attribute can now be used on struct fields and enum variants.
10218 * std: The `option` and `result` API's have been overhauled to make them
10219 simpler, more consistent, and more composable.
10220 * std: The entire `std::io` module has been replaced with one that is
10221 more comprehensive and that properly interfaces with the underlying
10222 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10224 * std: `io::util` contains a number of useful implementations of
10225 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10226 `ZeroReader`, `TeeReader`.
10227 * std: The reference counted pointer type `extra::rc` moved into std.
10228 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10229 just a wrapper around it).
10230 * std: The `Either` type has been removed.
10231 * std: `fmt::Default` can be implemented for any type to provide default
10232 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10233 * std: The `rand` API continues to be tweaked.
10234 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10235 on failure in gdb, is now named `rust_fail`.
10236 * std: The `each_key` and `each_value` methods on `HashMap` have been
10237 replaced by the `keys` and `values` iterators.
10238 * std: Functions dealing with type size and alignment have moved from the
10239 `sys` module to the `mem` module.
10240 * std: The `path` module was written and API changed.
10241 * std: `str::from_utf8` has been changed to cast instead of allocate.
10242 * std: `starts_with` and `ends_with` methods added to vectors via the
10243 `ImmutableEqVector` trait, which is in the prelude.
10244 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10245 if the index is out of bounds.
10246 * std: Task failure no longer propagates between tasks, as the model was
10247 complex, expensive, and incompatible with thread-based tasks.
10248 * std: The `Any` type can be used for dynamic typing.
10249 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10251 * std: Methods that produce iterators generally do not have an `_iter`
10253 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10254 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10255 * std: `util::ignore` renamed to `prelude::drop`.
10256 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10258 * std: `vec::raw` has seen a lot of cleanup and API changes.
10259 * std: The standard library no longer includes any C++ code, and very
10260 minimal C, eliminating the dependency on libstdc++.
10261 * std: Runtime scheduling and I/O functionality has been factored out into
10262 extensible interfaces and is now implemented by two different crates:
10263 libnative, for native threading and I/O; and libgreen, for green threading
10264 and I/O. This paves the way for using the standard library in more limited
10265 embedded environments.
10266 * std: The `comm` module has been rewritten to be much faster, have a
10267 simpler, more consistent API, and to work for both native and green
10269 * std: All libuv dependencies have been moved into the rustuv crate.
10270 * native: New implementations of runtime scheduling on top of OS threads.
10271 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10273 * green: The green thread scheduler and message passing types are almost
10274 entirely lock-free.
10275 * extra: The `flatpipes` module had bitrotted and was removed.
10276 * extra: All crypto functions have been removed and Rust now has a policy of
10277 not reimplementing crypto in the standard library. In the future crypto
10278 will be provided by external crates with bindings to established libraries.
10279 * extra: `c_vec` has been modernized.
10280 * extra: The `sort` module has been removed. Use the `sort` method on
10284 * The `rust` and `rusti` commands have been removed, due to lack of
10286 * `rustdoc` was completely rewritten.
10287 * `rustdoc` can test code examples in documentation.
10288 * `rustpkg` can test packages with the argument, 'test'.
10289 * `rustpkg` supports arbitrary dependencies, including C libraries.
10290 * `rustc`'s support for generating debug info is improved again.
10291 * `rustc` has better error reporting for unbalanced delimiters.
10292 * `rustc`'s JIT support was removed due to bitrot.
10293 * Executables and static libraries can be built with LTO (-Z lto)
10294 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10298 Version 0.8 (2013-09-26)
10299 ============================
10301 * ~2200 changes, numerous bugfixes
10304 * The `for` loop syntax has changed to work with the `Iterator` trait.
10305 * At long last, unwinding works on Windows.
10306 * Default methods are ready for use.
10307 * Many trait inheritance bugs fixed.
10308 * Owned and borrowed trait objects work more reliably.
10309 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10310 * rustc can omit emission of code for the `debug!` macro if it is passed
10312 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10313 for foo.rs, then foo/mod.rs, and will generate an error when both are
10315 * Strings no longer contain trailing nulls. The new `std::c_str` module
10316 provides new mechanisms for converting to C strings.
10317 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10318 * The FFI has been overhauled such that foreign functions are called directly,
10319 instead of through a stack-switching wrapper.
10320 * Calling a foreign function must be done through a Rust function with the
10321 `#[fixed_stack_segment]` attribute.
10322 * The `externfn!` macro can be used to declare both a foreign function and
10323 a `#[fixed_stack_segment]` wrapper at once.
10324 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10325 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10326 * `priv` is disallowed everywhere except for struct fields and enum variants.
10327 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10328 * `ref` bindings in irrefutable patterns work correctly now.
10329 * `char` is now prevented from containing invalid code points.
10330 * Casting to `bool` is no longer allowed.
10331 * `\0` is now accepted as an escape in chars and strings.
10332 * `yield` is a reserved keyword.
10333 * `typeof` is a reserved keyword.
10334 * Crates may be imported by URL with `extern mod foo = "url";`.
10335 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10336 * Static vectors can be initialized with repeating elements,
10337 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10338 * Static structs can be initialized with functional record update,
10339 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10340 * `cfg!` can be used to conditionally execute code based on the crate
10341 configuration, similarly to `#[cfg(...)]`.
10342 * The `unnecessary_qualification` lint detects unneeded module
10343 prefixes (default: allow).
10344 * Arithmetic operations have been implemented on the SIMD types in
10345 `std::unstable::simd`.
10346 * Exchange allocation headers were removed, reducing memory usage.
10347 * `format!` implements a completely new, extensible, and higher-performance
10348 string formatting system. It will replace `fmt!`.
10349 * `print!` and `println!` write formatted strings (using the `format!`
10350 extension) to stdout.
10351 * `write!` and `writeln!` write formatted strings (using the `format!`
10352 extension) to the new Writers in `std::rt::io`.
10353 * The library section in which a function or static is placed may
10354 be specified with `#[link_section = "..."]`.
10355 * The `proto!` syntax extension for defining bounded message protocols
10357 * `macro_rules!` is hygienic for `let` declarations.
10358 * The `#[export_name]` attribute specifies the name of a symbol.
10359 * `unreachable!` can be used to indicate unreachable code, and fails
10363 * std: Transitioned to the new runtime, written in Rust.
10364 * std: Added an experimental I/O library, `rt::io`, based on the new
10366 * std: A new generic `range` function was added to the prelude, replacing
10367 `uint::range` and friends.
10368 * std: `range_rev` no longer exists. Since range is an iterator it can be
10369 reversed with `range(lo, hi).invert()`.
10370 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10371 renamed to `unwrap_or`.
10372 * std: The `iterator` module was renamed to `iter`.
10373 * std: Integral types now support the `checked_add`, `checked_sub`, and
10374 `checked_mul` operations for detecting overflow.
10375 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10377 * std: Methods are standardizing on conventions for casting methods:
10378 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10380 * std: The `CString` type in `c_str` provides new ways to convert to and
10382 * std: `DoubleEndedIterator` can yield elements in two directions.
10383 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10385 * std: `str::from_bytes` renamed to `str::from_utf8`.
10386 * std: `pop_opt` and `shift_opt` methods added to vectors.
10387 * std: The task-local data interface no longer uses @, and keys are
10388 no longer function pointers.
10389 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10390 * std: Added `SharedPort` to `comm`.
10391 * std: `Eq` has a default method for `ne`; only `eq` is required
10392 in implementations.
10393 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10394 is required in implementations.
10395 * std: `is_utf8` performance is improved, impacting many string functions.
10396 * std: `os::MemoryMap` provides cross-platform mmap.
10397 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10398 are not 'in-bounds' are considered undefined.
10399 * std: Many freestanding functions in `vec` removed in favor of methods.
10400 * std: Many freestanding functions on scalar types removed in favor of
10402 * std: Many options to task builders were removed since they don't make
10403 sense in the new scheduler design.
10404 * std: More containers implement `FromIterator` so can be created by the
10406 * std: More complete atomic types in `unstable::atomics`.
10407 * std: `comm::PortSet` removed.
10408 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10409 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10410 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10411 default implementations.
10412 * std: Various `from_str` functions were removed in favor of a generic
10413 `from_str` which is available in the prelude.
10414 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10415 * extra: `dlist`, the doubly-linked list was modernized.
10416 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10417 * extra: Added `glob` module, replacing `std::os::glob`.
10418 * extra: `rope` was removed.
10419 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10420 * extra: `net`, and `timer` were removed. The experimental replacements
10421 are `std::rt::io::net` and `std::rt::io::timer`.
10422 * extra: Iterators implemented for `SmallIntMap`.
10423 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10424 * extra: `SmallIntSet` removed. Use `BitvSet`.
10425 * extra: Performance of JSON parsing greatly improved.
10426 * extra: `semver` updated to SemVer 2.0.0.
10427 * extra: `term` handles more terminals correctly.
10428 * extra: `dbg` module removed.
10429 * extra: `par` module removed.
10430 * extra: `future` was cleaned up, with some method renames.
10431 * extra: Most free functions in `getopts` were converted to methods.
10434 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10435 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10436 similarly to gcc's `--march` flag.
10437 * rustc's performance compiling small crates is much better.
10438 * rustpkg has received many improvements.
10439 * rustpkg supports git tags as package IDs.
10440 * rustpkg builds into target-specific directories so it can be used for
10442 * The number of concurrent test tasks is controlled by the environment
10443 variable RUST_TEST_TASKS.
10444 * The test harness can now report metrics for benchmarks.
10445 * All tools have man pages.
10446 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10447 * The runtime uses jemalloc for allocations.
10448 * Segmented stacks are temporarily disabled as part of the transition to
10449 the new runtime. Stack overflows are possible!
10450 * A new documentation backend, rustdoc_ng, is available for use. It is
10451 still invoked through the normal `rustdoc` command.
10454 Version 0.7 (2013-07-03)
10455 =======================
10457 * ~2000 changes, numerous bugfixes
10460 * `impl`s no longer accept a visibility qualifier. Put them on methods
10462 * The borrow checker has been rewritten with flow-sensitivity, fixing
10463 many bugs and inconveniences.
10464 * The `self` parameter no longer implicitly means `&'self self`,
10465 and can be explicitly marked with a lifetime.
10466 * Overloadable compound operators (`+=`, etc.) have been temporarily
10467 removed due to bugs.
10468 * The `for` loop protocol now requires `for`-iterators to return `bool`
10469 so they compose better.
10470 * The `Durable` trait is replaced with the `'static` bounds.
10471 * Trait default methods work more often.
10472 * Structs with the `#[packed]` attribute have byte alignment and
10473 no padding between fields.
10474 * Type parameters bound by `Copy` must now be copied explicitly with
10475 the `copy` keyword.
10476 * It is now illegal to move out of a dereferenced unsafe pointer.
10477 * `Option<~T>` is now represented as a nullable pointer.
10478 * `@mut` does dynamic borrow checks correctly.
10479 * The `main` function is only detected at the topmost level of the crate.
10480 The `#[main]` attribute is still valid anywhere.
10481 * Struct fields may no longer be mutable. Use inherited mutability.
10482 * The `#[no_send]` attribute makes a type that would otherwise be
10484 * The `#[no_freeze]` attribute makes a type that would otherwise be
10486 * Unbounded recursion will abort the process after reaching the limit
10487 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10488 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10489 are never implicitly copyable.
10490 * `#[static_assert]` makes compile-time assertions about static bools.
10491 * At long last, 'argument modes' no longer exist.
10492 * The rarely used `use mod` statement no longer exists.
10494 * Syntax extensions
10495 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10497 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10498 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10499 `#[deriving(...)]`.
10500 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10501 and unsuffixed integer literals.
10504 * The `core` crate was renamed to `std`.
10505 * The `std` crate was renamed to `extra`.
10506 * More and improved documentation.
10507 * std: `iterator` module for external iterator objects.
10508 * Many old-style (internal, higher-order function) iterators replaced by
10509 implementations of `Iterator`.
10510 * std: Many old internal vector and string iterators,
10511 incl. `any`, `all`. removed.
10512 * std: The `finalize` method of `Drop` renamed to `drop`.
10513 * std: The `drop` method now takes `&mut self` instead of `&self`.
10514 * std: The prelude no longer re-exports any modules, only types and traits.
10515 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10516 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10517 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10518 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10519 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10520 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10521 * std: Many types implement `Clone`.
10522 * std: `path` type renamed to `Path`.
10523 * std: `mut` module and `Mut` type removed.
10524 * std: Many standalone functions removed in favor of methods and iterators
10525 in `vec`, `str`. In the future methods will also work as functions.
10526 * std: `reinterpret_cast` removed. Use `transmute`.
10527 * std: ascii string handling in `std::ascii`.
10528 * std: `Rand` is implemented for ~/@.
10529 * std: `run` module for spawning processes overhauled.
10530 * std: Various atomic types added to `unstable::atomic`.
10531 * std: Various types implement `Zero`.
10532 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10533 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10534 * std: Added `os::mkdir_recursive`.
10535 * std: Added `os::glob` function performs filesystems globs.
10536 * std: `FuzzyEq` renamed to `ApproxEq`.
10537 * std: `Map` now defines `pop` and `swap` methods.
10538 * std: `Cell` constructors converted to static methods.
10539 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10540 * extra: `flate` module moved from `std` to `extra`.
10541 * extra: `fileinput` module for iterating over a series of files.
10542 * extra: `Complex` number type and `complex` module.
10543 * extra: `Rational` number type and `rational` module.
10544 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10545 * extra: `term` uses terminfo now, is more correct.
10546 * extra: `arc` functions converted to methods.
10547 * extra: Implementation of fixed output size variations of SHA-2.
10550 * `unused_variables` lint mode for unused variables (default: warn).
10551 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10553 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10555 * `dead_assignment` lint mode for unread variables (default: warn).
10556 * `unnecessary_allocation` lint mode detects some heap allocations that are
10557 immediately borrowed so could be written without allocating (default: warn).
10558 * `missing_doc` lint mode (default: allow).
10559 * `unreachable_code` lint mode (default: warn).
10560 * The `rusti` command has been rewritten and a number of bugs addressed.
10561 * rustc outputs in color on more terminals.
10562 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10563 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10564 * Compiling with `-g` will make the binary record information about
10565 dynamic borrowcheck failures for debugging.
10566 * rustdoc has a nicer stylesheet.
10567 * Various improvements to rustdoc.
10568 * Improvements to rustpkg (see the detailed release notes).
10571 Version 0.6 (2013-04-03)
10572 ========================
10574 * ~2100 changes, numerous bugfixes
10577 * The self type parameter in traits is now spelled `Self`
10578 * The `self` parameter in trait and impl methods must now be explicitly
10579 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10580 * Static methods no longer require the `static` keyword and instead
10581 are distinguished by the lack of a `self` parameter
10582 * Replaced the `Durable` trait with the `'static` lifetime
10583 * The old closure type syntax with the trailing sigil has been
10584 removed in favor of the more consistent leading sigil
10585 * `super` is a keyword, and may be prefixed to paths
10586 * Trait bounds are separated with `+` instead of whitespace
10587 * Traits are implemented with `impl Trait for Type`
10588 instead of `impl Type: Trait`
10589 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10590 * The `export` keyword has finally been removed
10591 * The `move` keyword has been removed (see "Semantic changes")
10592 * The interior mutability qualifier on vectors, `[mut T]`, has been
10593 removed. Use `&mut [T]`, etc.
10594 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10595 * `fail` is no longer a keyword. Use `fail!()`
10596 * `assert` is no longer a keyword. Use `assert!()`
10597 * `log` is no longer a keyword. use `debug!`, etc.
10598 * 1-tuples may be represented as `(T,)`
10599 * Struct fields may no longer be `mut`. Use inherited mutability,
10600 `@mut T`, `core::mut` or `core::cell`
10601 * `extern mod { ... }` is no longer valid syntax for foreign
10602 function modules. Use extern blocks: `extern { ... }`
10603 * Newtype enums removed. Use tuple-structs.
10604 * Trait implementations no longer support visibility modifiers
10605 * Pattern matching over vectors improved and expanded
10606 * `const` renamed to `static` to correspond to lifetime name,
10607 and make room for future `static mut` unsafe mutable globals.
10608 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10609 * `Clone` implementations can be automatically generated with
10610 `#[deriving(Clone)]`
10611 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10612 instead of `foo as Bar`.
10613 * Fixed length vector types are now written as `[int, .. 3]`
10614 instead of `[int * 3]`.
10615 * Fixed length vector types can express the length as a constant
10616 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10619 * Types with owned pointers or custom destructors move by default,
10620 eliminating the `move` keyword
10621 * All foreign functions are considered unsafe
10622 * &mut is now unaliasable
10623 * Writes to borrowed @mut pointers are prevented dynamically
10625 * The name of the main function can be customized using #[main]
10626 * The default type of an inferred closure is &fn instead of @fn
10627 * `use` statements may no longer be "chained" - they cannot import
10628 identifiers imported by previous `use` statements
10629 * `use` statements are crate relative, importing from the "top"
10630 of the crate by default. Paths may be prefixed with `super::`
10631 or `self::` to change the search behavior.
10632 * Method visibility is inherited from the implementation declaration
10633 * Structural records have been removed
10634 * Many more types can be used in static items, including enums
10635 'static-lifetime pointers and vectors
10636 * Pattern matching over vectors improved and expanded
10637 * Typechecking of closure types has been overhauled to
10638 improve inference and eliminate unsoundness
10639 * Macros leave scope at the end of modules, unless that module is
10640 tagged with #[macro_escape]
10643 * Added big integers to `std::bigint`
10644 * Removed `core::oldcomm` module
10645 * Added pipe-based `core::comm` module
10646 * Numeric traits have been reorganized under `core::num`
10647 * `vec::slice` finally returns a slice
10648 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10649 * Containers reorganized around traits in `core::container`
10650 * `core::dvec` removed, `~[T]` is a drop-in replacement
10651 * `core::send_map` renamed to `core::hashmap`
10652 * `std::map` removed; replaced with `core::hashmap`
10653 * `std::treemap` reimplemented as an owned balanced tree
10654 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10655 * `core::trie` added as a fast ordered map for integer keys
10656 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10657 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10658 overload the comparison operators, whereas `TotalOrd` is used
10659 by certain container types
10662 * Replaced the 'cargo' package manager with 'rustpkg'
10663 * Added all-purpose 'rust' tool
10664 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10665 * rustc now *attempts* to offer spelling suggestions
10666 * Improved support for ARM and Android
10667 * Preliminary MIPS backend
10668 * Improved foreign function ABI implementation for x86, x86_64
10669 * Various memory usage improvements
10670 * Rust code may be embedded in foreign code under limited circumstances
10671 * Inline assembler supported by new asm!() syntax extension.
10674 Version 0.5 (2012-12-21)
10675 ===========================
10677 * ~900 changes, numerous bugfixes
10680 * Removed `<-` move operator
10681 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10682 * Removed old fixed length vector syntax - `[T]/N`
10683 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10684 * Macros may now expand to items and statements
10685 * `a.b()` is always parsed as a method call, never as a field projection
10686 * `Eq` and `IterBytes` implementations can be automatically generated
10687 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10688 * Removed the special crate language for `.rc` files
10689 * Function arguments may consist of any irrefutable pattern
10692 * `&` and `~` pointers may point to objects
10693 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10694 * Enum variants may be structs
10695 * Destructors can be added to all nominal types with the Drop trait
10696 * Structs and nullary enum variants may be constants
10697 * Values that cannot be implicitly copied are now automatically moved
10698 without writing `move` explicitly
10699 * `&T` may now be coerced to `*T`
10700 * Coercions happen in `let` statements as well as function calls
10701 * `use` statements now take crate-relative paths
10702 * The module and type namespaces have been merged so that static
10703 method names can be resolved under the trait in which they are
10706 * Improved support for language features
10707 * Trait inheritance works in many scenarios
10708 * More support for explicit self arguments in methods - `self`, `&self`
10709 `@self`, and `~self` all generally work as expected
10710 * Static methods work in more situations
10711 * Experimental: Traits may declare default methods for the implementations
10715 * New condition handling system in `core::condition`
10716 * Timsort added to `std::sort`
10717 * New priority queue, `std::priority_queue`
10718 * Pipes for serializable types, `std::flatpipes'
10719 * Serialization overhauled to be trait-based
10720 * Expanded `getopts` definitions
10721 * Moved futures to `std`
10722 * More functions are pure now
10723 * `core::comm` renamed to `oldcomm`. Still deprecated
10724 * `rustdoc` and `cargo` are libraries now
10727 * Added a preliminary REPL, `rusti`
10728 * License changed from MIT to dual MIT/APL2
10731 Version 0.4 (2012-10-15)
10732 ==========================
10734 * ~2000 changes, numerous bugfixes
10737 * All keywords are now strict and may not be used as identifiers anywhere
10738 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10739 'of', 'with', 'to', 'class'.
10740 * Classes are replaced with simpler structs
10741 * Explicit method self types
10742 * `ret` became `return` and `alt` became `match`
10743 * `import` is now `use`; `use is now `extern mod`
10744 * `extern mod { ... }` is now `extern { ... }`
10745 * `use mod` is the recommended way to import modules
10746 * `pub` and `priv` replace deprecated export lists
10747 * The syntax of `match` pattern arms now uses fat arrow (=>)
10748 * `main` no longer accepts an args vector; use `os::args` instead
10751 * Trait implementations are now coherent, ala Haskell typeclasses
10752 * Trait methods may be static
10753 * Argument modes are deprecated
10754 * Borrowed pointers are much more mature and recommended for use
10755 * Strings and vectors in the static region are stored in constant memory
10756 * Typestate was removed
10757 * Resolution rewritten to be more reliable
10758 * Support for 'dual-mode' data structures (freezing and thawing)
10761 * Most binary operators can now be overloaded via the traits in
10763 * `std::net::url` for representing URLs
10764 * Sendable hash maps in `core::send_map`
10765 * `core::task' gained a (currently unsafe) task-local storage API
10768 * An efficient new intertask communication primitive called the pipe,
10769 along with a number of higher-level channel types, in `core::pipes`
10770 * `std::arc`, an atomically reference counted, immutable, shared memory
10772 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10773 * Futures are now based on pipes and sendable
10774 * More robust linked task failure
10775 * Improved task builder API
10778 * Improved error reporting
10779 * Preliminary JIT support
10780 * Preliminary work on precise GC
10781 * Extensive architectural improvements to rustc
10782 * Begun a transition away from buggy C++-based reflection (shape) code to
10783 Rust-based (visitor) code
10784 * All hash functions and tables converted to secure, randomized SipHash
10787 Version 0.3 (2012-07-12)
10788 ========================
10790 * ~1900 changes, numerous bugfixes
10792 * New coding conveniences
10793 * Integer-literal suffix inference
10794 * Per-item control over warnings, errors
10795 * #[cfg(windows)] and #[cfg(unix)] attributes
10796 * Documentation comments
10797 * More compact closure syntax
10798 * 'do' expressions for treating higher-order functions as
10800 * *-patterns (wildcard extended to all constructor fields)
10803 * Name resolution pass and exhaustiveness checker rewritten
10804 * Region pointers and borrow checking supersede alias
10806 * Init-ness checking is now provided by a region-based liveness
10807 pass instead of the typestate pass; same for last-use analysis
10808 * Extensive work on region pointers
10810 * Experimental new language features
10811 * Slices and fixed-size, interior-allocated vectors
10812 * #!-comments for lang versioning, shell execution
10813 * Destructors and iface implementation for classes;
10814 type-parameterized classes and class methods
10815 * 'const' type kind for types that can be used to implement
10816 shared-memory concurrency patterns
10820 * Removal of various obsolete features
10821 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10822 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10824 * Constructs: do-while loops ('do' repurposed), fn binding,
10825 resources (replaced by destructors)
10827 * Compiler reorganization
10828 * Syntax-layer of compiler split into separate crate
10829 * Clang (from LLVM project) integrated into build
10830 * Typechecker split into sub-modules
10833 * New time functions
10834 * Extension methods for many built-in types
10835 * Arc: atomic-refcount read-only / exclusive-use shared cells
10836 * Par: parallel map and search routines
10837 * Extensive work on libuv interface
10838 * Much vector code moved to libraries
10839 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10840 #include, #include_str, #include_bin
10842 * Tool improvements
10843 * Cargo automatically resolves dependencies
10846 Version 0.2 (2012-03-29)
10847 =========================
10849 * >1500 changes, numerous bugfixes
10851 * New docs and doc tooling
10853 * New port: FreeBSD x86_64
10855 * Compilation model enhancements
10856 * Generics now specialized, multiply instantiated
10857 * Functions now inlined across separate crates
10859 * Scheduling, stack and threading fixes
10860 * Noticeably improved message-passing performance
10861 * Explicit schedulers
10865 * Experimental new language features
10866 * Operator overloading
10870 * Various language extensions
10871 * C-callback function types: 'crust fn ...'
10872 * Infinite-loop construct: 'loop { ... }'
10873 * Shorten 'mutable' to 'mut'
10874 * Required mutable-local qualifier: 'let mut ...'
10875 * Basic glob-exporting: 'export foo::*;'
10876 * Alt now exhaustive, 'alt check' for runtime-checked
10877 * Block-function form of 'for' loop, with 'break' and 'ret'.
10880 * AST quasi-quote syntax extension
10881 * Revived libuv interface
10882 * New modules: core::{future, iter}, std::arena
10883 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10884 * Extensive cleanup, regularization in libstd, libcore
10887 Version 0.1 (2012-01-20)
10888 ===============================
10890 * Most language features work, including:
10891 * Unique pointers, unique closures, move semantics
10892 * Interface-constrained generics
10893 * Static interface dispatch
10895 * Multithread task scheduling
10896 * Typestate predicates
10897 * Failure unwinding, destructors
10898 * Pattern matching and destructuring assignment
10899 * Lightweight block-lambda syntax
10900 * Preliminary macro-by-example
10902 * Compiler works with the following configurations:
10903 * Linux: x86 and x86_64 hosts and targets
10904 * macOS: x86 and x86_64 hosts and targets
10905 * Windows: x86 hosts and targets
10907 * Cross compilation / multi-target configuration supported.
10909 * Preliminary API-documentation and package-management tools included.
10913 * Documentation is incomplete.
10915 * Performance is below intended target.
10917 * Standard library APIs are subject to extensive change, reorganization.
10919 * Language-level versioning is not yet operational - future code will
10920 break unexpectedly.