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]
163 - [Create more accurate debuginfo for vtables.][89597]
164 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
165 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
166 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
167 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
169 \* Refer to Rust's [platform support page][platform-support-doc] for more
170 information on Rust's tiered platform support.
175 - [Avoid allocations and copying in `Vec::leak`][89337]
176 - [Add `#[repr(i8)]` to `Ordering`][89507]
177 - [Optimize `File::read_to_end` and `read_to_string`][89582]
178 - [Update to Unicode 14.0][89614]
179 - [Many more functions are marked `#[must_use]`][89692], producing a warning
180 when ignoring their return value. This helps catch mistakes such as expecting
181 a function to mutate a value in place rather than return a new value.
186 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
187 - [`[T; N]::as_slice`][`array::as_slice`]
188 - [`collections::TryReserveError`]
189 - [`HashMap::try_reserve`]
190 - [`HashSet::try_reserve`]
191 - [`String::try_reserve`]
192 - [`String::try_reserve_exact`]
193 - [`Vec::try_reserve`]
194 - [`Vec::try_reserve_exact`]
195 - [`VecDeque::try_reserve`]
196 - [`VecDeque::try_reserve_exact`]
197 - [`Iterator::map_while`]
199 - [`proc_macro::is_available`]
200 - [`Command::get_program`]
201 - [`Command::get_args`]
202 - [`Command::get_envs`]
203 - [`Command::get_current_dir`]
207 These APIs are now usable in const contexts:
209 - [`hint::unreachable_unchecked`]
214 - [Stabilize custom profiles][cargo/9943]
221 These changes provide no direct user facing benefits, but represent significant
222 improvements to the internals and overall performance of rustc
225 - [Added an experimental backend for codegen with `libgccjit`.][87260]
227 [86191]: https://github.com/rust-lang/rust/pull/86191/
228 [87220]: https://github.com/rust-lang/rust/pull/87220/
229 [87260]: https://github.com/rust-lang/rust/pull/87260/
230 [88321]: https://github.com/rust-lang/rust/pull/88321/
231 [88529]: https://github.com/rust-lang/rust/pull/88529/
232 [88690]: https://github.com/rust-lang/rust/pull/88690/
233 [88952]: https://github.com/rust-lang/rust/pull/88952/
234 [89337]: https://github.com/rust-lang/rust/pull/89337/
235 [89507]: https://github.com/rust-lang/rust/pull/89507/
236 [89508]: https://github.com/rust-lang/rust/pull/89508/
237 [89582]: https://github.com/rust-lang/rust/pull/89582/
238 [89597]: https://github.com/rust-lang/rust/pull/89597/
239 [89614]: https://github.com/rust-lang/rust/pull/89614/
240 [89692]: https://github.com/rust-lang/rust/issues/89692/
241 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
242 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
243 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
244 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
245 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
246 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
247 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
248 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
249 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
250 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
251 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
252 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
253 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
254 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
255 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
256 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
257 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
258 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
259 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
260 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
261 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
263 Version 1.56.1 (2021-11-01)
264 ===========================
266 - New lints to detect the presence of bidirectional-override Unicode
267 codepoints in the compiled source code ([CVE-2021-42574])
269 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
271 Version 1.56.0 (2021-10-21)
272 ========================
277 - [The 2021 Edition is now stable.][rust#88100]
278 See [the edition guide][rust-2021-edition-guide] for more details.
279 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
280 - [Union field access is permitted in `const fn`.][rust#85769]
282 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
287 - [Upgrade to LLVM 13.][rust#87570]
288 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
289 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
290 - [Warnings can be forced on with `--force-warn`.][rust#87472]
291 This feature is primarily intended for usage by `cargo fix`, rather than end users.
292 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
293 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
294 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
296 \* Refer to Rust's [platform support page][platform-support-doc] for more
297 information on Rust's tiered platform support.
302 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
303 The Windows console still requires valid Unicode, but this change allows
304 splitting a UTF-8 character across multiple write calls. This allows, for
305 instance, programs that just read and write data buffers (e.g. copying a file
306 to stdout) without regard for Unicode or character boundaries.
307 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
308 For this use case, atomics scale much better under contention.
309 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
310 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
311 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
312 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
313 - [Treat invalid environment variable names as non-existent.][rust#86183]
314 Previously, the environment functions would panic if given a variable name
315 with an internal null character or equal sign (`=`). Now, these functions will
316 just treat such names as non-existent variables, since the OS cannot represent
317 the existence of a variable with such a name.
322 - [`std::os::unix::fs::chroot`]
323 - [`UnsafeCell::raw_get`]
324 - [`BufWriter::into_parts`]
325 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
326 These APIs were previously stable in `std`, but are now also available in `core`.
328 - [`String::shrink_to`]
329 - [`OsString::shrink_to`]
330 - [`PathBuf::shrink_to`]
331 - [`BinaryHeap::shrink_to`]
332 - [`VecDeque::shrink_to`]
333 - [`HashMap::shrink_to`]
334 - [`HashSet::shrink_to`]
336 These APIs are now usable in const contexts:
338 - [`std::mem::transmute`]
339 - [`[T]::first`][`slice::first`]
340 - [`[T]::split_first`][`slice::split_first`]
341 - [`[T]::last`][`slice::last`]
342 - [`[T]::split_last`][`slice::split_last`]
347 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
348 This has no effect at present on dependency version selection.
349 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
350 that support Rust code to include a crate's specified minimum version in the test matrix for that
356 - [Update to new argument parsing rules on Windows.][rust#87580]
357 This adjusts Rust's standard library to match the behavior of the standard
358 libraries for C/C++. The rules have changed slightly over time, and this PR
359 brings us to the latest set of rules (changed in 2008).
360 - [Disallow the aapcs calling convention on aarch64][rust#88399]
361 This was already not supported by LLVM; this change surfaces this lack of
362 support with a better error message.
363 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
364 - [Warn when an escaped newline skips multiple lines.][rust#87671]
365 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
366 may return different values on glibc <= 2.24.][rust#81825]
367 Rust now invokes the `clone3` system call directly, when available, to use new functionality
368 available via that system call. Older versions of glibc cache the result of `getpid`, and only
369 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
370 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
374 These changes provide no direct user facing benefits, but represent significant
375 improvements to the internals and overall performance of rustc
378 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
379 This improves the performance of most Rust builds.
380 - [Unify representation of macros in internal data structures.][rust#88019]
381 This change fixes a host of bugs with the handling of macros by the compiler,
384 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
385 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
386 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
387 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
388 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
389 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
390 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
391 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
392 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
393 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
394 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
395 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
396 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
397 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
398 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
399 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
400 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
401 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
402 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
403 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
404 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
405 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
406 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
407 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
408 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
409 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
410 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
411 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
412 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
413 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
414 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
415 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
416 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
417 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
418 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
419 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
420 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
421 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
422 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
423 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
424 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
425 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
427 Version 1.55.0 (2021-09-09)
428 ============================
432 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
433 will end at the maximum value of the integer.][83918]
434 - [You can now explicitly import the prelude of different editions
435 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
439 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
441 \* Refer to Rust's [platform support page][platform-support-doc] for more
442 information on Rust's tiered platform support.
447 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
448 These improvements should in general provide faster string parsing of floats,
449 no longer reject certain valid floating point values, and reduce
450 the produced code size for non-stripped artifacts.
451 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
458 - [`IntoInnerError::into_error`]
459 - [`IntoInnerError::into_parts`]
460 - [`MaybeUninit::assume_init_mut`]
461 - [`MaybeUninit::assume_init_ref`]
462 - [`MaybeUninit::write`]
464 - [`ops::ControlFlow`]
466 - [`x86::_bittestandcomplement`]
467 - [`x86::_bittestandreset`]
468 - [`x86::_bittestandset`]
469 - [`x86_64::_bittest64`]
470 - [`x86_64::_bittestandcomplement64`]
471 - [`x86_64::_bittestandreset64`]
472 - [`x86_64::_bittestandset64`]
474 The following previously stable functions are now `const`.
476 - [`str::from_utf8_unchecked`]
481 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
482 rustc in parallel such as when using `cargo test`.][cargo/9675]
483 - [The package definition in `cargo metadata` now includes the `"default_run"`
484 field from the manifest.][cargo/9550]
485 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
486 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
487 of packages.][cargo/9663]
491 - [Added "Go to item on exact match" search option.][85876]
492 - [The "Implementors" section on traits no longer shows redundant
493 method definitions.][85970]
494 - [Trait implementations are toggled open by default.][86260] This should make the
495 implementations more searchable by tools like `CTRL+F` in your browser.
496 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
497 through type aliases.][86334]
498 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
499 "Trait Implementations" section.][86513]
504 - [std functions that return an `io::Error` will no longer use the
505 `ErrorKind::Other` variant.][85746] This is to better reflect that these
506 kinds of errors could be categorised [into newer more specific `ErrorKind`
507 variants][79965], and that they do not represent a user error.
508 - [Using environment variable names with `process::Command` on Windows now
509 behaves as expected.][85270] Previously using envionment variables with
510 `Command` would cause them to be ASCII-uppercased.
511 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
512 with `rustdoc::`][86849]
513 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
514 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
515 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
518 [86849]: https://github.com/rust-lang/rust/pull/86849
519 [86513]: https://github.com/rust-lang/rust/pull/86513
520 [86334]: https://github.com/rust-lang/rust/pull/86334
521 [86260]: https://github.com/rust-lang/rust/pull/86260
522 [85970]: https://github.com/rust-lang/rust/pull/85970
523 [85876]: https://github.com/rust-lang/rust/pull/85876
524 [83572]: https://github.com/rust-lang/rust/pull/83572
525 [86294]: https://github.com/rust-lang/rust/pull/86294
526 [86858]: https://github.com/rust-lang/rust/pull/86858
527 [86761]: https://github.com/rust-lang/rust/pull/86761
528 [85746]: https://github.com/rust-lang/rust/pull/85746
529 [85270]: https://github.com/rust-lang/rust/pull/85270
530 [83918]: https://github.com/rust-lang/rust/pull/83918
531 [79965]: https://github.com/rust-lang/rust/pull/79965
532 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
533 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
534 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
535 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
536 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
537 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
538 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
539 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
540 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
541 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
542 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
543 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
544 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
545 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
546 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
547 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
548 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
549 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
550 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
551 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
552 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
553 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
556 Version 1.54.0 (2021-07-29)
557 ============================
560 -----------------------
562 - [You can now use macros for values in some built-in attributes.][83366]
563 This primarily allows you to call macros within the `#[doc]` attribute. For
564 example, to include external documentation in your crate, you can now write
567 #![doc = include_str!("README.md")]
570 - [You can now cast between unsized slice types (and types which contain
571 unsized slices) in `const fn`.][85078]
572 - [You can now use multiple generic lifetimes with `impl Trait` where the
573 lifetimes don't explicitly outlive another.][84701] In code this means
574 that you can now have `impl Trait<'a, 'b>` where as before you could
575 only have `impl Trait<'a, 'b> where 'b: 'a`.
578 -----------------------
580 - [Rustc will now search for custom JSON targets in
581 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
582 directory.][83800] You can find your sysroot directory by running
583 `rustc --print sysroot`.
584 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
585 - [You can now use `#[target_feature]` on safe functions when targeting
586 WebAssembly platforms.][84988]
587 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
588 - [Added tier 3\* support for `bpfel-unknown-none`
589 and `bpfeb-unknown-none`.][79608]
590 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
592 \* Refer to Rust's [platform support page][platform-support-doc] for more
593 information on Rust's tiered platform support.
596 -----------------------
598 - [`panic::panic_any` will now `#[track_caller]`.][85745]
599 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
600 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
601 - [The implementations of vendor intrinsics in core::arch have been
602 significantly refactored.][83278] The main user-visible changes are
603 a 50% reduction in the size of libcore.rlib and stricter validation
604 of constant operands passed to intrinsics. The latter is technically
605 a breaking change, but allows Rust to more closely match the C vendor
611 - [`BTreeMap::into_keys`]
612 - [`BTreeMap::into_values`]
613 - [`HashMap::into_keys`]
614 - [`HashMap::into_values`]
616 - [`VecDeque::binary_search`]
617 - [`VecDeque::binary_search_by`]
618 - [`VecDeque::binary_search_by_key`]
619 - [`VecDeque::partition_point`]
624 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
625 the dependency graph.][cargo/9520]
626 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
627 in the tree ][cargo/9499]
628 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
629 macro dependencies.][cargo/9488]
630 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
631 This variable points to a directory that integration tests and benches
632 can use as a "scratchpad" for testing filesystem operations.
636 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
637 - [Previously unsound code is no longer permitted where different constructors in branches
638 could require different lifetimes.][85574]
639 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
640 than before and may reject some previously accepted code.
641 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
642 when compiled with `codegen-units = 1`.][86063]
644 [85574]: https://github.com/rust-lang/rust/issues/85574
645 [86831]: https://github.com/rust-lang/rust/issues/86831
646 [86063]: https://github.com/rust-lang/rust/issues/86063
647 [79608]: https://github.com/rust-lang/rust/pull/79608
648 [84988]: https://github.com/rust-lang/rust/pull/84988
649 [84701]: https://github.com/rust-lang/rust/pull/84701
650 [84072]: https://github.com/rust-lang/rust/pull/84072
651 [85745]: https://github.com/rust-lang/rust/pull/85745
652 [84744]: https://github.com/rust-lang/rust/pull/84744
653 [85078]: https://github.com/rust-lang/rust/pull/85078
654 [84717]: https://github.com/rust-lang/rust/pull/84717
655 [83800]: https://github.com/rust-lang/rust/pull/83800
656 [83366]: https://github.com/rust-lang/rust/pull/83366
657 [83278]: https://github.com/rust-lang/rust/pull/83278
658 [85292]: https://github.com/rust-lang/rust/pull/85292
659 [82834]: https://github.com/rust-lang/rust/pull/82834
660 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
661 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
662 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
663 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
664 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
665 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
666 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
667 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
668 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
669 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
670 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
672 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
674 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
676 Version 1.53.0 (2021-06-17)
677 ============================
680 -----------------------
681 - [You can now use unicode for identifiers.][83799] This allows multilingual
682 identifiers but still doesn't allow glyphs that are not considered characters
683 such as `◆` or `🦀`. More specifically you can now use any identifier that
684 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
685 is the same standard as languages like Python, however Rust uses NFC
686 normalization which may be different from other languages.
687 - [You can now specify "or patterns" inside pattern matches.][79278]
688 Previously you could only use `|` (OR) on complete patterns. E.g.
692 matches!(x, Some(1) | Some(2));
694 matches!(x, Some(1 | 2));
696 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
697 has the same semantics as the `:pat` matcher. This is to allow `:pat`
698 to change semantics to being a pattern fragment in a future edition.
701 -----------------------
702 - [Updated the minimum external LLVM version to LLVM 10.][83387]
703 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
704 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
706 \* Refer to Rust's [platform support page][platform-support-doc] for more
707 information on Rust's tiered platform support.
710 -----------------------
711 - [Abort messages will now forward to `android_set_abort_message` on
712 Android platforms when available.][81469]
713 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
714 - [Arrays of any length now implement `IntoIterator`.][84147]
715 Currently calling `.into_iter()` as a method on an array will
716 return `impl Iterator<Item=&T>`, but this may change in a
717 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
718 directly on arrays will provide `impl Iterator<Item=T>` as expected.
719 - [`leading_zeros`, and `trailing_zeros` are now available on all
720 `NonZero` integer types.][84082]
721 - [`{f32, f64}::from_str` now parse and print special values
722 (`NaN`, `-0`) according to IEEE 754.][78618]
723 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
724 - [Add the `BITS` associated constant to all numeric types.][82565]
728 - [`AtomicBool::fetch_update`]
729 - [`AtomicPtr::fetch_update`]
730 - [`BTreeMap::retain`]
731 - [`BTreeSet::retain`]
732 - [`BufReader::seek_relative`]
733 - [`DebugStruct::non_exhaustive`]
736 - [`Duration::is_zero`]
737 - [`Duration::saturating_add`]
738 - [`Duration::saturating_mul`]
739 - [`Duration::saturating_sub`]
740 - [`ErrorKind::Unsupported`]
742 - [`Ordering::is_eq`]
743 - [`Ordering::is_ge`]
744 - [`Ordering::is_gt`]
745 - [`Ordering::is_le`]
746 - [`Ordering::is_lt`]
747 - [`Ordering::is_ne`]
748 - [`OsStr::is_ascii`]
749 - [`OsStr::make_ascii_lowercase`]
750 - [`OsStr::make_ascii_uppercase`]
751 - [`OsStr::to_ascii_lowercase`]
752 - [`OsStr::to_ascii_uppercase`]
753 - [`Peekable::peek_mut`]
754 - [`Rc::decrement_strong_count`]
755 - [`Rc::increment_strong_count`]
756 - [`Vec::extend_from_within`]
757 - [`array::from_mut`]
758 - [`array::from_ref`]
759 - [`cmp::max_by_key`]
761 - [`cmp::min_by_key`]
763 - [`f32::is_subnormal`]
764 - [`f64::is_subnormal`]
767 -----------------------
768 - [Cargo now supports git repositories where the default `HEAD` branch is not
769 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
770 which can handle default branches correctly.
771 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
772 - [The `authors` field is no longer included in `Cargo.toml` for new
773 projects.][cargo/9282]
776 -----------------------
777 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
778 without hyperlinks.][81764]
782 - [Implement token-based handling of attributes during expansion][82608]
783 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
784 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
785 to confusion and potential security vulnerabilities and [is no
786 longer recommended][ietf6943].
787 - [The added `BITS` constant may conflict with external definitions.][85667]
788 In particular, this was known to be a problem in the `lexical-core` crate,
789 but they have published fixes for semantic versions 0.4 through 0.7. To
790 update this dependency alone, use `cargo update -p lexical-core`.
791 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
795 These changes provide no direct user facing benefits, but represent significant
796 improvements to the internals and overall performance of rustc and
799 - [Rework the `std::sys::windows::alloc` implementation.][83065]
800 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
801 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
802 - [Rework rustdoc const type][82873]
804 [85667]: https://github.com/rust-lang/rust/pull/85667
805 [83386]: https://github.com/rust-lang/rust/pull/83386
806 [82771]: https://github.com/rust-lang/rust/pull/82771
807 [84147]: https://github.com/rust-lang/rust/pull/84147
808 [84082]: https://github.com/rust-lang/rust/pull/84082
809 [83799]: https://github.com/rust-lang/rust/pull/83799
810 [83681]: https://github.com/rust-lang/rust/pull/83681
811 [83652]: https://github.com/rust-lang/rust/pull/83652
812 [83387]: https://github.com/rust-lang/rust/pull/83387
813 [82873]: https://github.com/rust-lang/rust/pull/82873
814 [82864]: https://github.com/rust-lang/rust/pull/82864
815 [82608]: https://github.com/rust-lang/rust/pull/82608
816 [82565]: https://github.com/rust-lang/rust/pull/82565
817 [80525]: https://github.com/rust-lang/rust/pull/80525
818 [79278]: https://github.com/rust-lang/rust/pull/79278
819 [78618]: https://github.com/rust-lang/rust/pull/78618
820 [77704]: https://github.com/rust-lang/rust/pull/77704
821 [83941]: https://github.com/rust-lang/rust/pull/83941
822 [83065]: https://github.com/rust-lang/rust/pull/83065
823 [81764]: https://github.com/rust-lang/rust/pull/81764
824 [81469]: https://github.com/rust-lang/rust/pull/81469
825 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
826 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
827 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
828 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
829 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
830 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
831 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
832 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
833 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
834 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
835 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
836 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
837 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
838 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
839 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
840 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
841 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
842 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
843 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
844 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
845 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
846 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
847 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
848 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
849 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
850 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
851 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
852 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
853 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
854 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
855 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
856 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
857 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
858 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
859 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
860 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
861 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
862 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
863 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
864 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
865 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
868 Version 1.52.1 (2021-05-10)
869 ============================
871 This release disables incremental compilation, unless the user has explicitly
872 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
874 This is due to the widespread, and frequently occuring, breakage encountered by
875 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
876 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
877 newly added incremental verification are still present in past stable versions,
878 and are not yet fixed on any channel. These bugs can lead to miscompilation of
881 These problems only affect incremental builds, so release builds with Cargo
882 should not be affected unless the user has explicitly opted into incremental.
883 Debug and check builds are affected.
885 See [84970] for more details.
887 [84970]: https://github.com/rust-lang/rust/issues/84970
889 Version 1.52.0 (2021-05-06)
890 ============================
894 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
895 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
896 is allowed by default, and may become a warning or hard error in a
898 - [You can now cast mutable references to arrays to a pointer of the same type as
903 - [Upgraded the default LLVM to LLVM 12.][81451]
905 Added tier 3\* support for the following targets.
907 - [`s390x-unknown-linux-musl`][82166]
908 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
909 - [`powerpc-unknown-openbsd`][82733]
911 \* Refer to Rust's [platform support page][platform-support-doc] for more
912 information on Rust's tiered platform support.
916 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
917 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
918 - [`Arc<impl Error>` now implements `error::Error`.][80553]
919 - [All integer division and remainder operations are now `const`.][80962]
923 - [`Arguments::as_str`]
925 - [`char::REPLACEMENT_CHARACTER`]
926 - [`char::UNICODE_VERSION`]
927 - [`char::decode_utf16`]
928 - [`char::from_digit`]
929 - [`char::from_u32_unchecked`]
931 - [`slice::partition_point`]
932 - [`str::rsplit_once`]
933 - [`str::split_once`]
935 The following previously stable APIs are now `const`.
938 - [`char::len_utf16`]
939 - [`char::to_ascii_uppercase`]
940 - [`char::to_ascii_lowercase`]
941 - [`char::eq_ignore_ascii_case`]
942 - [`u8::to_ascii_uppercase`]
943 - [`u8::to_ascii_lowercase`]
944 - [`u8::eq_ignore_ascii_case`]
948 - [Rustdoc lints are now treated as a tool lint, meaning that
949 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
950 Using the old style is still allowed, and will become a warning in
952 - [Rustdoc now supports argument files.][82261]
953 - [Rustdoc now generates smart punctuation for documentation.][79423]
954 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
962 - [You can now pass multiple filters to tests.][81356] E.g.
963 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
964 - [Rustup now distributes PDB symbols for the `std` library on Windows,
965 allowing you to see `std` symbols when debugging.][82218]
969 These changes provide no direct user facing benefits, but represent significant
970 improvements to the internals and overall performance of rustc and
973 - [Check the result cache before the DepGraph when ensuring queries][81855]
974 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
975 - [Only store a LocalDefId in some HIR nodes][81611]
976 - [Store HIR attributes in a side table][79519]
980 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
981 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
982 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
983 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
984 languages in code blocks.][78429]
985 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
986 - [Changes in how proc macros handle whitespace may lead to panics when used
987 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
988 - [Turn `#[derive]` into a regular macro attribute][79078]
990 [84136]: https://github.com/rust-lang/rust/issues/84136
991 [80763]: https://github.com/rust-lang/rust/pull/80763
992 [82166]: https://github.com/rust-lang/rust/pull/82166
993 [82121]: https://github.com/rust-lang/rust/pull/82121
994 [81879]: https://github.com/rust-lang/rust/pull/81879
995 [82261]: https://github.com/rust-lang/rust/pull/82261
996 [82218]: https://github.com/rust-lang/rust/pull/82218
997 [82216]: https://github.com/rust-lang/rust/pull/82216
998 [82202]: https://github.com/rust-lang/rust/pull/82202
999 [81855]: https://github.com/rust-lang/rust/pull/81855
1000 [81766]: https://github.com/rust-lang/rust/pull/81766
1001 [81744]: https://github.com/rust-lang/rust/pull/81744
1002 [81611]: https://github.com/rust-lang/rust/pull/81611
1003 [81479]: https://github.com/rust-lang/rust/pull/81479
1004 [81451]: https://github.com/rust-lang/rust/pull/81451
1005 [81356]: https://github.com/rust-lang/rust/pull/81356
1006 [80962]: https://github.com/rust-lang/rust/pull/80962
1007 [80553]: https://github.com/rust-lang/rust/pull/80553
1008 [80527]: https://github.com/rust-lang/rust/pull/80527
1009 [79519]: https://github.com/rust-lang/rust/pull/79519
1010 [79423]: https://github.com/rust-lang/rust/pull/79423
1011 [79208]: https://github.com/rust-lang/rust/pull/79208
1012 [78429]: https://github.com/rust-lang/rust/pull/78429
1013 [82733]: https://github.com/rust-lang/rust/pull/82733
1014 [82594]: https://github.com/rust-lang/rust/pull/82594
1015 [79078]: https://github.com/rust-lang/rust/pull/79078
1016 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1017 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1018 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1019 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1020 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1021 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1022 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1023 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1024 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1025 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1026 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1027 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1028 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1029 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1030 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1031 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1032 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1033 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1034 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1035 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1036 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1037 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1039 Version 1.51.0 (2021-03-25)
1040 ============================
1044 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1045 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1046 E.g. you can now write the following. Note: Only values of primitive integers,
1047 `bool`, or `char` types are currently permitted.
1049 struct GenericArray<T, const LENGTH: usize> {
1053 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1054 const fn last(&self) -> Option<&T> {
1058 Some(&self.inner[LENGTH - 1])
1068 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1069 This option controls whether debug information is split across multiple files
1070 or packed into a single file. **Note** This option is unstable on other platforms.
1071 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1072 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1073 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1074 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1076 \* Refer to Rust's [platform support page][platform-support-doc] for more
1077 information on Rust's tiered platform support.
1082 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1083 - [`str` now implements `AsMut<str>`.][80279]
1084 - [`u64` and `u128` now implement `From<char>`.][79502]
1085 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1086 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1087 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1088 - [`io::Empty` now implements `io::Seek`.][78044]
1089 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1090 `T: ?Sized` types.][80764]
1091 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1097 - [`Arc::decrement_strong_count`]
1098 - [`Arc::increment_strong_count`]
1099 - [`Once::call_once_force`]
1100 - [`Peekable::next_if_eq`]
1101 - [`Peekable::next_if`]
1102 - [`Seek::stream_position`]
1103 - [`array::IntoIter`]
1104 - [`panic::panic_any`]
1106 - [`ptr::addr_of_mut!`]
1107 - [`slice::fill_with`]
1108 - [`slice::split_inclusive_mut`]
1109 - [`slice::split_inclusive`]
1110 - [`slice::strip_prefix`]
1111 - [`slice::strip_suffix`]
1112 - [`str::split_inclusive`]
1113 - [`sync::OnceState`]
1115 - [`VecDeque::range`]
1116 - [`VecDeque::range_mut`]
1120 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1121 codegen option.][cargo/9112]
1122 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1123 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1124 to avoid unifying features of dependencies where that unification could be unwanted.
1125 Such as using the same dependency with a `std` feature in a build scripts and
1126 proc-macros, while using the `no-std` feature in the final binary. See the
1127 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1132 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1133 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1134 documentation.][79642]
1136 Various improvements to intra-doc links:
1138 - [You can link to non-path primitives such as `slice`.][80181]
1139 - [You can link to associated items.][74489]
1140 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1144 - [You can now pass `--include-ignored` to tests (e.g. with
1145 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1150 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1151 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1153 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1154 for the distributed artifacts.][81521]
1155 - `armv5te-unknown-linux-gnueabi`
1156 - `sparc64-unknown-linux-gnu`
1157 - `thumbv7neon-unknown-linux-gnueabihf`
1158 - `armv7-unknown-linux-gnueabi`
1159 - `x86_64-unknown-linux-gnux32`
1160 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1165 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1167 [79135]: https://github.com/rust-lang/rust/pull/79135
1168 [74489]: https://github.com/rust-lang/rust/pull/74489
1169 [76934]: https://github.com/rust-lang/rust/pull/76934
1170 [79570]: https://github.com/rust-lang/rust/pull/79570
1171 [80181]: https://github.com/rust-lang/rust/pull/80181
1172 [79642]: https://github.com/rust-lang/rust/pull/79642
1173 [80945]: https://github.com/rust-lang/rust/pull/80945
1174 [80279]: https://github.com/rust-lang/rust/pull/80279
1175 [80053]: https://github.com/rust-lang/rust/pull/80053
1176 [79502]: https://github.com/rust-lang/rust/pull/79502
1177 [75180]: https://github.com/rust-lang/rust/pull/75180
1178 [81521]: https://github.com/rust-lang/rust/pull/81521
1179 [80968]: https://github.com/rust-lang/rust/pull/80968
1180 [80959]: https://github.com/rust-lang/rust/pull/80959
1181 [80718]: https://github.com/rust-lang/rust/pull/80718
1182 [80653]: https://github.com/rust-lang/rust/pull/80653
1183 [80579]: https://github.com/rust-lang/rust/pull/80579
1184 [79998]: https://github.com/rust-lang/rust/pull/79998
1185 [78044]: https://github.com/rust-lang/rust/pull/78044
1186 [81455]: https://github.com/rust-lang/rust/pull/81455
1187 [80764]: https://github.com/rust-lang/rust/pull/80764
1188 [80749]: https://github.com/rust-lang/rust/pull/80749
1189 [80662]: https://github.com/rust-lang/rust/pull/80662
1190 [79134]: https://github.com/rust-lang/rust/pull/79134
1191 [80966]: https://github.com/rust-lang/rust/pull/80966
1192 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1193 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1194 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1195 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1196 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1197 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1198 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1199 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1200 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1201 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1202 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1203 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1204 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1205 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1206 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1207 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1208 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1209 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1210 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1211 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1212 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1213 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1214 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1216 Version 1.50.0 (2021-02-11)
1217 ============================
1220 -----------------------
1221 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1222 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1223 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1226 -----------------------
1227 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1228 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1229 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1230 - [Dropped support for all cloudabi targets.][78439]
1232 \* Refer to Rust's [platform support page][platform-support-doc] for more
1233 information on Rust's tiered platform support.
1236 -----------------------
1238 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1239 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1240 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1241 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1242 up the same amount of space as `File`.
1248 - [`btree_map::Entry::or_insert_with_key`]
1251 - [`hash_map::Entry::or_insert_with_key`]
1255 - [`UnsafeCell::get_mut`]
1257 The following previously stable methods are now `const`.
1259 - [`IpAddr::is_ipv4`]
1260 - [`IpAddr::is_ipv6`]
1261 - [`IpAddr::is_unspecified`]
1262 - [`IpAddr::is_loopback`]
1263 - [`IpAddr::is_multicast`]
1264 - [`Ipv4Addr::octets`]
1265 - [`Ipv4Addr::is_loopback`]
1266 - [`Ipv4Addr::is_private`]
1267 - [`Ipv4Addr::is_link_local`]
1268 - [`Ipv4Addr::is_multicast`]
1269 - [`Ipv4Addr::is_broadcast`]
1270 - [`Ipv4Addr::is_documentation`]
1271 - [`Ipv4Addr::to_ipv6_compatible`]
1272 - [`Ipv4Addr::to_ipv6_mapped`]
1273 - [`Ipv6Addr::segments`]
1274 - [`Ipv6Addr::is_unspecified`]
1275 - [`Ipv6Addr::is_loopback`]
1276 - [`Ipv6Addr::is_multicast`]
1277 - [`Ipv6Addr::to_ipv4`]
1280 - [`Layout::from_size_align`]
1281 - `pow` for all integer types.
1282 - `checked_pow` for all integer types.
1283 - `saturating_pow` for all integer types.
1284 - `wrapping_pow` for all integer types.
1285 - `next_power_of_two` for all unsigned integer types.
1286 - `checked_next_power_of_two` for all unsigned integer types.
1289 -----------------------
1291 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1292 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1293 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1294 contents of that directory for changes.][cargo/8973]
1295 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1300 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1301 - [Running tests will now print the total time taken to execute.][75752]
1306 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1307 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1308 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1309 unhygenic `macro_rules!` macros.][79472]
1310 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1311 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1312 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1313 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1314 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1315 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1317 [74989]: https://github.com/rust-lang/rust/pull/74989
1318 [79261]: https://github.com/rust-lang/rust/pull/79261
1319 [79896]: https://github.com/rust-lang/rust/pull/79896
1320 [79484]: https://github.com/rust-lang/rust/pull/79484
1321 [79472]: https://github.com/rust-lang/rust/pull/79472
1322 [79270]: https://github.com/rust-lang/rust/pull/79270
1323 [79003]: https://github.com/rust-lang/rust/pull/79003
1324 [78864]: https://github.com/rust-lang/rust/pull/78864
1325 [78636]: https://github.com/rust-lang/rust/pull/78636
1326 [78439]: https://github.com/rust-lang/rust/pull/78439
1327 [78343]: https://github.com/rust-lang/rust/pull/78343
1328 [78296]: https://github.com/rust-lang/rust/pull/78296
1329 [78068]: https://github.com/rust-lang/rust/pull/78068
1330 [75752]: https://github.com/rust-lang/rust/pull/75752
1331 [74699]: https://github.com/rust-lang/rust/pull/74699
1332 [78142]: https://github.com/rust-lang/rust/pull/78142
1333 [77484]: https://github.com/rust-lang/rust/pull/77484
1334 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1335 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1336 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1337 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1338 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1339 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1340 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1341 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1342 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1343 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1344 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1345 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1346 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1347 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1348 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1349 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1350 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1351 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1352 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1353 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1354 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1355 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1356 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1357 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1358 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1359 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1360 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1361 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1362 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1363 [`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
1364 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1365 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1366 [`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
1367 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1370 Version 1.49.0 (2020-12-31)
1371 ============================
1374 -----------------------
1376 - [Unions can now implement `Drop`, and you can now have a field in a union
1377 with `ManuallyDrop<T>`.][77547]
1378 - [You can now cast uninhabited enums to integers.][76199]
1379 - [You can now bind by reference and by move in patterns.][76119] This
1380 allows you to selectively borrow individual components of a type. E.g.
1388 let person = Person {
1389 name: String::from("Alice"),
1393 // `name` is moved out of person, but `age` is referenced.
1394 let Person { name, ref age } = person;
1395 println!("{} {}", name, age);
1399 -----------------------
1401 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1402 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1403 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1404 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1405 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1406 - [Output from threads spawned in tests is now captured.][78227]
1407 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1409 \* Refer to Rust's [platform support page][platform-support-doc] for more
1410 information on Rust's tiered platform support.
1413 -----------------------
1415 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1416 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1421 - [`slice::select_nth_unstable`]
1422 - [`slice::select_nth_unstable_by`]
1423 - [`slice::select_nth_unstable_by_key`]
1425 The following previously stable methods are now `const`.
1427 - [`Poll::is_ready`]
1428 - [`Poll::is_pending`]
1431 -----------------------
1432 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1433 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1434 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1435 variable will be set if the crate being built is one the user selected to build, either
1436 with `-p` or through defaults.
1437 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1443 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1444 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1445 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1446 Previously such invalid or unused attributes could be ignored.
1447 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1448 read [this post about the changes][rustdoc-ws-post] for more details.
1449 - [Trait bounds are no longer inferred for associated types.][79904]
1453 These changes provide no direct user facing benefits, but represent significant
1454 improvements to the internals and overall performance of rustc and
1457 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1458 Local Storage model.][78201]
1459 - [Calculate visibilities once in resolve.][78077]
1460 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1461 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1464 [75991]: https://github.com/rust-lang/rust/pull/75991
1465 [78951]: https://github.com/rust-lang/rust/pull/78951
1466 [78848]: https://github.com/rust-lang/rust/pull/78848
1467 [78746]: https://github.com/rust-lang/rust/pull/78746
1468 [78376]: https://github.com/rust-lang/rust/pull/78376
1469 [78228]: https://github.com/rust-lang/rust/pull/78228
1470 [78227]: https://github.com/rust-lang/rust/pull/78227
1471 [78201]: https://github.com/rust-lang/rust/pull/78201
1472 [78109]: https://github.com/rust-lang/rust/pull/78109
1473 [78077]: https://github.com/rust-lang/rust/pull/78077
1474 [77997]: https://github.com/rust-lang/rust/pull/77997
1475 [77703]: https://github.com/rust-lang/rust/pull/77703
1476 [77547]: https://github.com/rust-lang/rust/pull/77547
1477 [77015]: https://github.com/rust-lang/rust/pull/77015
1478 [76199]: https://github.com/rust-lang/rust/pull/76199
1479 [76119]: https://github.com/rust-lang/rust/pull/76119
1480 [75914]: https://github.com/rust-lang/rust/pull/75914
1481 [79004]: https://github.com/rust-lang/rust/pull/79004
1482 [78676]: https://github.com/rust-lang/rust/pull/78676
1483 [79904]: https://github.com/rust-lang/rust/issues/79904
1484 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1485 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1486 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1487 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1488 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1489 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1490 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1491 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1492 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1493 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1495 Version 1.48.0 (2020-11-19)
1496 ==========================
1501 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1502 is still rejected *semantically*, but can now be parsed by procedural macros.
1506 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1507 `rustc` whether to link its own C runtime and libraries or to rely on a external
1508 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1509 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1510 Note: If you're using cargo you must explicitly pass the `--target` flag.
1511 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1513 \* Refer to Rust's [platform support page][platform-support-doc] for more
1514 information on Rust's tiered platform support.
1518 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1519 and `&Stderr`.][76275]
1520 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1521 - [The `matches!` macro now supports having a trailing comma.][74880]
1522 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1523 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1527 - [`slice::as_ptr_range`]
1528 - [`slice::as_mut_ptr_range`]
1529 - [`VecDeque::make_contiguous`]
1530 - [`future::pending`]
1533 The following previously stable methods are now `const fn`'s:
1535 - [`Option::is_some`]
1536 - [`Option::is_none`]
1537 - [`Option::as_ref`]
1539 - [`Result::is_err`]
1540 - [`Result::as_ref`]
1541 - [`Ordering::reverse`]
1542 - [`Ordering::then`]
1549 - [You can now link to items in `rustdoc` using the intra-doc link
1550 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1551 a link to `std::future`'s documentation. See ["Linking to items by
1552 name"][intradoc-links] for more information.
1553 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1554 when searching through `rustdoc`'s UI.][75740]
1558 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1559 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1560 promoted to `'static` lifetime any more inside `const fn`s.
1561 - [Associated type bindings on trait objects are now verified to meet the bounds
1562 declared on the trait when checking that they implement the trait.][27675]
1563 - [When trait bounds on associated types or opaque types are ambiguous, the
1564 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1565 - [Fixed recursive nonterminals not being expanded in macros during
1566 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1567 correctly handling recursive nonterminal tokens.
1568 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1569 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1570 in places where they have no effect.][73461]
1571 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1572 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1573 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1574 disallow zero-initialization.][71274]
1575 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1576 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1577 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1578 see the [`catch_unwind`] documentation for further information.
1584 These changes provide no direct user facing benefits, but represent significant
1585 improvements to the internals and overall performance of rustc and
1588 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1589 You can continue building with `make` by setting `ninja=false` in
1591 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1592 - [Made `ensure_sufficient_stack()` non-generic][76680]
1594 [78143]: https://github.com/rust-lang/rust/issues/78143
1595 [76680]: https://github.com/rust-lang/rust/pull/76680/
1596 [76030]: https://github.com/rust-lang/rust/pull/76030/
1597 [70212]: https://github.com/rust-lang/rust/pull/70212/
1598 [27675]: https://github.com/rust-lang/rust/issues/27675/
1599 [54121]: https://github.com/rust-lang/rust/issues/54121/
1600 [71274]: https://github.com/rust-lang/rust/pull/71274/
1601 [77386]: https://github.com/rust-lang/rust/pull/77386/
1602 [77153]: https://github.com/rust-lang/rust/pull/77153/
1603 [77055]: https://github.com/rust-lang/rust/pull/77055/
1604 [76275]: https://github.com/rust-lang/rust/pull/76275/
1605 [76310]: https://github.com/rust-lang/rust/pull/76310/
1606 [76420]: https://github.com/rust-lang/rust/pull/76420/
1607 [76158]: https://github.com/rust-lang/rust/pull/76158/
1608 [75857]: https://github.com/rust-lang/rust/pull/75857/
1609 [75585]: https://github.com/rust-lang/rust/pull/75585/
1610 [75740]: https://github.com/rust-lang/rust/pull/75740/
1611 [75502]: https://github.com/rust-lang/rust/pull/75502/
1612 [74880]: https://github.com/rust-lang/rust/pull/74880/
1613 [74922]: https://github.com/rust-lang/rust/pull/74922/
1614 [74430]: https://github.com/rust-lang/rust/pull/74430/
1615 [74194]: https://github.com/rust-lang/rust/pull/74194/
1616 [73461]: https://github.com/rust-lang/rust/pull/73461/
1617 [73166]: https://github.com/rust-lang/rust/pull/73166/
1618 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1619 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1620 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1621 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1622 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1623 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1624 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1625 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1626 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1627 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1628 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1629 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1630 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1631 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1632 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1635 Version 1.47.0 (2020-10-08)
1636 ==========================
1640 - [Closures will now warn when not used.][74869]
1644 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1645 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1647 - [Upgraded to LLVM 11.][73526]
1648 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1649 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1650 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1652 \* Refer to Rust's [platform support page][platform-support-doc] for more
1653 information on Rust's tiered platform support.
1657 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1658 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1659 those of length less than 33.][74060]
1660 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1661 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1662 `PartialEq`, and `PartialOrd`.][73583]
1666 - [`Ident::new_raw`]
1667 - [`Range::is_empty`]
1668 - [`RangeInclusive::is_empty`]
1669 - [`Result::as_deref`]
1670 - [`Result::as_deref_mut`]
1672 - [`pointer::offset_from`]
1676 The following previously stable APIs have now been made const.
1678 - [The `new` method for all `NonZero` integers.][73858]
1679 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1680 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1681 methods for all integers.][73858]
1682 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1683 signed integers.][73858]
1684 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1685 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1686 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1687 `is_ascii_control` methods for `char` and `u8`.][73858]
1691 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1692 You can override this by setting the following in your `Cargo.toml`.
1694 [profile.release.build-override]
1697 - [`cargo-help` will now display man pages for commands rather just the
1698 `--help` text.][cargo/8456]
1699 - [`cargo-metadata` now emits a `test` field indicating if a target has
1700 tests enabled.][cargo/8478]
1701 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1702 - [`cargo-publish` will now use an alternative registry by default if it's the
1703 only registry specified in `package.publish`.][cargo/8571]
1707 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1708 type based search.][75366]
1709 - [Added the Ayu theme to rustdoc.][71237]
1713 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1714 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1715 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1716 help to preserve more span information.][73084] These changes may cause
1717 compiliation errors if your macro was unhygenic or didn't correctly handle
1719 - [Moved support for the CloudABI target to tier 3.][75568]
1720 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1721 - [Added the `rustc-docs` component.][75560] This allows you to install
1722 and read the documentation for the compiler internal APIs. (Currently only
1723 available for `x86_64-unknown-linux-gnu`.)
1728 - [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.
1730 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1731 [75048]: https://github.com/rust-lang/rust/pull/75048/
1732 [74163]: https://github.com/rust-lang/rust/pull/74163/
1733 [71237]: https://github.com/rust-lang/rust/pull/71237/
1734 [74869]: https://github.com/rust-lang/rust/pull/74869/
1735 [73858]: https://github.com/rust-lang/rust/pull/73858/
1736 [75716]: https://github.com/rust-lang/rust/pull/75716/
1737 [75560]: https://github.com/rust-lang/rust/pull/75560/
1738 [75568]: https://github.com/rust-lang/rust/pull/75568/
1739 [75366]: https://github.com/rust-lang/rust/pull/75366/
1740 [75204]: https://github.com/rust-lang/rust/pull/75204/
1741 [74650]: https://github.com/rust-lang/rust/pull/74650/
1742 [74419]: https://github.com/rust-lang/rust/pull/74419/
1743 [73964]: https://github.com/rust-lang/rust/pull/73964/
1744 [74021]: https://github.com/rust-lang/rust/pull/74021/
1745 [74060]: https://github.com/rust-lang/rust/pull/74060/
1746 [73893]: https://github.com/rust-lang/rust/pull/73893/
1747 [73526]: https://github.com/rust-lang/rust/pull/73526/
1748 [73583]: https://github.com/rust-lang/rust/pull/73583/
1749 [73084]: https://github.com/rust-lang/rust/pull/73084/
1750 [73197]: https://github.com/rust-lang/rust/pull/73197/
1751 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1752 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1753 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1754 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1755 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1756 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1757 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1758 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1759 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1760 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1761 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1762 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1763 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1764 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1767 Version 1.46.0 (2020-08-27)
1768 ==========================
1772 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1773 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1774 const functions.][73862]
1775 - [The `#[track_caller]` attribute can now be added to functions to use the
1776 function's caller's location information for panic messages.][72445]
1777 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1778 `x.0.0` over `(x.0).0`.
1779 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1780 You currently can't use `mem::transmute` in constant functions.
1784 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1785 - [Enabled static "Position Independent Executables" by default
1786 for `x86_64-unknown-linux-musl`.][70740]
1790 - [`mem::forget` is now a `const fn`.][73887]
1791 - [`String` now implements `From<char>`.][73466]
1792 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1793 integer types.][73032]
1794 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1795 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1796 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1797 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1798 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1799 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1804 - [`vec::Drain::as_slice`]
1808 Added a number of new environment variables that are now available when
1809 compiling your crate.
1811 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1812 the specific binary being compiled and the name of the crate.
1813 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1814 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1818 - [The target configuration option `abi_blacklist` has been renamed
1819 to `unsupported_abis`.][74150] The old name will still continue to work.
1820 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1821 This was previously accepted but will become a hard error in a future release.
1822 - [Rustc will fail to compile if you have a struct with
1823 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1825 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1826 ensure that spans have the correct information, and may cause breakage if you
1827 were relying on receiving spans with dummy information.
1828 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1829 a legacy installer that was replaced by a MSI installer a few years ago but
1830 was still being built.
1831 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1832 - [Rustc will no longer accept overlapping trait implementations that only
1833 differ in how the lifetime was bound.][72493]
1834 - [Rustc now correctly relates the lifetime of an existential associated
1835 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1836 you to pass a shorter lifetime than expected.
1837 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1838 The library will need to be installed for `rustc` to work, even though we
1839 expect it to be already available on most systems.
1840 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1842 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1843 exact output returned by rustc's pretty printing is an unstable
1844 implementation detail: we recommend any macro relying on it to switch to a
1845 more robust parsing system.
1847 [75453]: https://github.com/rust-lang/rust/issues/75453/
1848 [74820]: https://github.com/rust-lang/rust/issues/74820/
1849 [74420]: https://github.com/rust-lang/rust/issues/74420/
1850 [74109]: https://github.com/rust-lang/rust/pull/74109/
1851 [74150]: https://github.com/rust-lang/rust/pull/74150/
1852 [73862]: https://github.com/rust-lang/rust/pull/73862/
1853 [73887]: https://github.com/rust-lang/rust/pull/73887/
1854 [73466]: https://github.com/rust-lang/rust/pull/73466/
1855 [73516]: https://github.com/rust-lang/rust/pull/73516/
1856 [73293]: https://github.com/rust-lang/rust/pull/73293/
1857 [73007]: https://github.com/rust-lang/rust/pull/73007/
1858 [73032]: https://github.com/rust-lang/rust/pull/73032/
1859 [72920]: https://github.com/rust-lang/rust/pull/72920/
1860 [72569]: https://github.com/rust-lang/rust/pull/72569/
1861 [72583]: https://github.com/rust-lang/rust/pull/72583/
1862 [72584]: https://github.com/rust-lang/rust/pull/72584/
1863 [72717]: https://github.com/rust-lang/rust/pull/72717/
1864 [72437]: https://github.com/rust-lang/rust/pull/72437/
1865 [72445]: https://github.com/rust-lang/rust/pull/72445/
1866 [72486]: https://github.com/rust-lang/rust/pull/72486/
1867 [72493]: https://github.com/rust-lang/rust/pull/72493/
1868 [72331]: https://github.com/rust-lang/rust/pull/72331/
1869 [71896]: https://github.com/rust-lang/rust/pull/71896/
1870 [71660]: https://github.com/rust-lang/rust/pull/71660/
1871 [71322]: https://github.com/rust-lang/rust/pull/71322/
1872 [70740]: https://github.com/rust-lang/rust/pull/70740/
1873 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1874 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1875 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1876 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1877 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1880 Version 1.45.2 (2020-08-03)
1881 ==========================
1883 * [Fix bindings in tuple struct patterns][74954]
1884 * [Fix track_caller integration with trait objects][74784]
1886 [74954]: https://github.com/rust-lang/rust/issues/74954
1887 [74784]: https://github.com/rust-lang/rust/issues/74784
1890 Version 1.45.1 (2020-07-30)
1891 ==========================
1893 * [Fix const propagation with references.][73613]
1894 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1895 * [Avoid spurious implicit region bound.][74509]
1896 * [Install clippy on x.py install][74457]
1898 [73613]: https://github.com/rust-lang/rust/pull/73613
1899 [73078]: https://github.com/rust-lang/rust/issues/73078
1900 [74509]: https://github.com/rust-lang/rust/pull/74509
1901 [74457]: https://github.com/rust-lang/rust/pull/74457
1904 Version 1.45.0 (2020-07-16)
1905 ==========================
1909 - [Out of range float to int conversions using `as` has been defined as a saturating
1910 conversion.][71269] This was previously undefined behaviour, but you can use the
1911 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1912 may be desirable in rare performance sensitive situations.
1913 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1914 using `u64`.][70705]
1915 - [Function like procedural macros can now be used in expression, pattern, and statement
1916 positions.][68717] This means you can now use a function-like procedural macro
1917 anywhere you can use a declarative (`macro_rules!`) macro.
1921 - [You can now override individual target features through the `target-feature`
1922 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1923 equivalent to `-C target-feature=+avx2,+fma`.
1924 - [Added the `force-unwind-tables` flag.][69984] This option allows
1925 rustc to always generate unwind tables regardless of panic strategy.
1926 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1927 to include LLVM bitcode into generated `rlib`s (this is on by default).
1928 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1929 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1930 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1931 - [Upgraded to LLVM 10.][67759]
1933 \* Refer to Rust's [platform support page][platform-support-doc] for more
1934 information on Rust's tiered platform support.
1939 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1941 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1942 - [You can now use `char` with
1943 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1944 a range of codepoints.][72413] E.g.
1945 you can now write the following;
1947 for ch in 'a'..='z' {
1951 // Prints "abcdefghijklmnopqrstuvwxyz"
1953 - [`OsString` now implements `FromStr`.][71662]
1954 - [The `saturating_neg` method has been added to all signed integer primitive
1955 types, and the `saturating_abs` method has been added for all integer
1956 primitive types.][71886]
1957 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1958 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1960 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1961 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1962 integer types.][69813]
1963 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1964 integer types.][72324]
1965 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1970 - [`BTreeMap::remove_entry`]
1972 - [`rc::Weak::as_ptr`]
1973 - [`rc::Weak::from_raw`]
1974 - [`rc::Weak::into_raw`]
1975 - [`str::strip_prefix`]
1976 - [`str::strip_suffix`]
1977 - [`sync::Weak::as_ptr`]
1978 - [`sync::Weak::from_raw`]
1979 - [`sync::Weak::into_raw`]
1980 - [`char::UNICODE_VERSION`]
1981 - [`Span::resolved_at`]
1982 - [`Span::located_at`]
1983 - [`Span::mixed_site`]
1984 - [`unix::process::CommandExt::arg0`]
1989 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1994 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1995 `~~outdated information~~` becomes "~~outdated information~~".
1996 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2000 - [Trying to self initialize a static value (that is creating a value using
2001 itself) is unsound and now causes a compile error.][71140]
2002 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2003 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2004 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2005 previously undocumented and not intended for public use. Rustdoc still provides
2006 a non-zero exit code on errors.
2007 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2008 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2009 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2010 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2011 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2015 - [Make clippy a git subtree instead of a git submodule][70655]
2016 - [Unify the undo log of all snapshot types][69464]
2018 [71848]: https://github.com/rust-lang/rust/issues/71848/
2019 [73420]: https://github.com/rust-lang/rust/issues/73420/
2020 [72324]: https://github.com/rust-lang/rust/pull/72324/
2021 [71843]: https://github.com/rust-lang/rust/pull/71843/
2022 [71886]: https://github.com/rust-lang/rust/pull/71886/
2023 [72234]: https://github.com/rust-lang/rust/pull/72234/
2024 [72239]: https://github.com/rust-lang/rust/pull/72239/
2025 [72397]: https://github.com/rust-lang/rust/pull/72397/
2026 [72413]: https://github.com/rust-lang/rust/pull/72413/
2027 [72014]: https://github.com/rust-lang/rust/pull/72014/
2028 [72062]: https://github.com/rust-lang/rust/pull/72062/
2029 [72094]: https://github.com/rust-lang/rust/pull/72094/
2030 [72133]: https://github.com/rust-lang/rust/pull/72133/
2031 [67759]: https://github.com/rust-lang/rust/pull/67759/
2032 [71900]: https://github.com/rust-lang/rust/pull/71900/
2033 [71928]: https://github.com/rust-lang/rust/pull/71928/
2034 [71662]: https://github.com/rust-lang/rust/pull/71662/
2035 [71716]: https://github.com/rust-lang/rust/pull/71716/
2036 [71447]: https://github.com/rust-lang/rust/pull/71447/
2037 [71269]: https://github.com/rust-lang/rust/pull/71269/
2038 [71095]: https://github.com/rust-lang/rust/pull/71095/
2039 [71140]: https://github.com/rust-lang/rust/pull/71140/
2040 [70655]: https://github.com/rust-lang/rust/pull/70655/
2041 [70705]: https://github.com/rust-lang/rust/pull/70705/
2042 [69984]: https://github.com/rust-lang/rust/pull/69984/
2043 [69813]: https://github.com/rust-lang/rust/pull/69813/
2044 [69464]: https://github.com/rust-lang/rust/pull/69464/
2045 [68717]: https://github.com/rust-lang/rust/pull/68717/
2046 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2047 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2048 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2049 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2050 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2051 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2052 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2053 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2054 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2055 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2056 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2057 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2058 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2059 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2060 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2061 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2062 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2065 Version 1.44.1 (2020-06-18)
2066 ===========================
2068 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2069 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2070 * [Fix crashes when finding backtrace on macOS.][71397]
2071 * [Clippy applies lint levels into different files.][clippy/5356]
2073 [71397]: https://github.com/rust-lang/rust/issues/71397
2074 [73078]: https://github.com/rust-lang/rust/issues/73078
2075 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2076 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2079 Version 1.44.0 (2020-06-04)
2080 ==========================
2084 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2085 - [Added the `unused_braces` lint.][70081]
2087 **Syntax-only changes**
2089 - [Expansion-driven outline module parsing][69838]
2094 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2099 These are still rejected semantically, so you will likely receive an error but
2100 these changes can be seen and parsed by macros and conditional compilation.
2104 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2105 Additionally when in incremental mode rustc defaults to 256 codegen units.
2106 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2107 a panic is thrown.][67502]
2108 - [Added tier 3\* support for the `aarch64-unknown-none` and
2109 `aarch64-unknown-none-softfloat` targets.][68334]
2110 - [Added tier 3 support for `arm64-apple-tvos` and
2111 `x86_64-apple-tvos` targets.][68191]
2116 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2117 `vec![]` to be able to be used in `const` contexts.
2118 - [`convert::Infallible` now implements `Hash`.][70281]
2119 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2120 a `&mut OsStr`.][70048]
2121 - [Unicode 13 is now supported.][69929]
2122 - [`String` now implements `From<&mut str>`.][69661]
2123 - [`IoSlice` now implements `Copy`.][69403]
2124 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2125 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2126 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2127 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2128 integer types.][69373]
2132 - [`PathBuf::with_capacity`]
2133 - [`PathBuf::capacity`]
2134 - [`PathBuf::clear`]
2135 - [`PathBuf::reserve`]
2136 - [`PathBuf::reserve_exact`]
2137 - [`PathBuf::shrink_to_fit`]
2138 - [`f32::to_int_unchecked`]
2139 - [`f64::to_int_unchecked`]
2140 - [`Layout::align_to`]
2141 - [`Layout::pad_to_align`]
2143 - [`Layout::extend`]
2147 - [Added the `cargo tree` command which will print a tree graph of
2148 your dependencies.][cargo/8062] E.g.
2150 mdbook v0.3.2 (/Users/src/rust/mdbook)
2152 │ ├── html5ever v0.24.0
2154 │ │ │ └── cfg-if v0.1.9
2156 │ │ └── markup5ever v0.9.0
2157 │ │ ├── log v0.4.8 (*)
2159 │ │ │ └── phf_shared v0.7.24
2160 │ │ │ ├── siphasher v0.2.3
2161 │ │ │ └── unicase v1.4.2
2162 │ │ │ [build-dependencies]
2163 │ │ │ └── version_check v0.1.5
2166 You can also display dependencies on multiple versions of the same crate with
2167 `cargo tree -d` (short for `cargo tree --duplicates`).
2171 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2172 the version in the sidebar.][69494]
2176 - [Rustc now correctly generates static libraries on Windows GNU targets with
2177 the `.a` extension, rather than the previous `.lib`.][70937]
2178 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2179 - [The `file_name` property in JSON output of macro errors now points the actual
2180 source file rather than the previous format of `<NAME macros>`.][70969]
2181 **Note:** this may not point to a file that actually exists on the user's system.
2182 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2183 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2184 not allow zero initialization such as `NonZeroU8`.][66059] This was
2185 previously a warning.
2186 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2187 operator has been defined as a saturating operation.][71269] This was previously
2188 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2189 continue using the current behaviour, which may be desirable in rare performance
2190 sensitive situations.
2194 These changes provide no direct user facing benefits, but represent significant
2195 improvements to the internals and overall performance of rustc and
2198 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2199 - [Replace big JS dict with JSON parsing.][71250]
2201 [69373]: https://github.com/rust-lang/rust/pull/69373/
2202 [66059]: https://github.com/rust-lang/rust/pull/66059/
2203 [68191]: https://github.com/rust-lang/rust/pull/68191/
2204 [68899]: https://github.com/rust-lang/rust/pull/68899/
2205 [71147]: https://github.com/rust-lang/rust/pull/71147/
2206 [71250]: https://github.com/rust-lang/rust/pull/71250/
2207 [70937]: https://github.com/rust-lang/rust/pull/70937/
2208 [70969]: https://github.com/rust-lang/rust/pull/70969/
2209 [70632]: https://github.com/rust-lang/rust/pull/70632/
2210 [70281]: https://github.com/rust-lang/rust/pull/70281/
2211 [70345]: https://github.com/rust-lang/rust/pull/70345/
2212 [70048]: https://github.com/rust-lang/rust/pull/70048/
2213 [70081]: https://github.com/rust-lang/rust/pull/70081/
2214 [70156]: https://github.com/rust-lang/rust/pull/70156/
2215 [71269]: https://github.com/rust-lang/rust/pull/71269/
2216 [69838]: https://github.com/rust-lang/rust/pull/69838/
2217 [69929]: https://github.com/rust-lang/rust/pull/69929/
2218 [69661]: https://github.com/rust-lang/rust/pull/69661/
2219 [69778]: https://github.com/rust-lang/rust/pull/69778/
2220 [69494]: https://github.com/rust-lang/rust/pull/69494/
2221 [69403]: https://github.com/rust-lang/rust/pull/69403/
2222 [69033]: https://github.com/rust-lang/rust/pull/69033/
2223 [68692]: https://github.com/rust-lang/rust/pull/68692/
2224 [68334]: https://github.com/rust-lang/rust/pull/68334/
2225 [67502]: https://github.com/rust-lang/rust/pull/67502/
2226 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2227 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2228 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2229 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2230 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2231 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2232 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2233 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2234 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2235 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2236 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2237 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2238 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2241 Version 1.43.1 (2020-05-07)
2242 ===========================
2244 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2245 * [Fixed the stabilization of AVX-512 features.][71473]
2246 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2248 [71430]: https://github.com/rust-lang/rust/pull/71430
2249 [71473]: https://github.com/rust-lang/rust/issues/71473
2250 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2253 Version 1.43.0 (2020-04-23)
2254 ==========================
2258 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2259 the type inferred correctly.][68129]
2260 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2262 **Syntax only changes**
2263 - [Allow `type Foo: Ord` syntactically.][69361]
2264 - [Fuse associated and extern items up to defaultness.][69194]
2265 - [Syntactically allow `self` in all `fn` contexts.][68764]
2266 - [Merge `fn` syntax + cleanup item parsing.][68728]
2267 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2268 For example, you may now write:
2270 macro_rules! mac_trait {
2280 These are still rejected *semantically*, so you will likely receive an error but
2281 these changes can be seen and parsed by macros and
2282 conditional compilation.
2287 - [You can now pass multiple lint flags to rustc to override the previous
2288 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2289 everything in the `unused` lint group except `unused-variables` which
2290 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2291 everything in the `unused` lint group **including** `unused-variables` since
2292 the allow flag is specified before the deny flag (and therefore overridden).
2293 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2294 if they are available on `windows-gnu`.][67429]
2295 - [rustc now buffers errors/warnings printed in JSON.][69227]
2299 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2300 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2301 respectively.][69538] **Note** These conversions are only available when `N`
2303 - [You can now use associated constants on floats and integers directly, rather
2304 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2305 `f32::NAN` with no imports.
2306 - [`u8::is_ascii` is now `const`.][68984]
2307 - [`String` now implements `AsMut<str>`.][68742]
2308 - [Added the `primitive` module to `std` and `core`.][67637] This module
2309 reexports Rust's primitive types. This is mainly useful in macros
2310 where you want avoid these types being shadowed.
2311 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2312 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2316 - [`Once::is_completed`]
2321 - [`iter::once_with`]
2325 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2326 your environment.][cargo/7823]
2327 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2328 executable path when running integration tests or benchmarks.][cargo/7697]
2329 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2330 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2334 - [Certain checks in the `const_err` lint were deemed unrelated to const
2335 evaluation][69185], and have been moved to the `unconditional_panic` and
2336 `arithmetic_overflow` lints.
2341 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2342 has been a warning since 1.36.0.
2343 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2344 led to some instances being accepted, and now correctly emits a hard error.
2346 [69340]: https://github.com/rust-lang/rust/pull/69340
2350 These changes provide no direct user facing benefits, but represent significant
2351 improvements to the internals and overall performance of `rustc` and
2354 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2355 - [Improved how rustc generates drop code.][67332]
2356 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2357 - [traits: preallocate 2 Vecs of known initial size][69022]
2358 - [Avoid exponential behaviour when relating types][68772]
2359 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2360 - [Improve performance of coherence checks][68966]
2361 - [Deduplicate types in the generator witness][68672]
2362 - [Invert control in struct_lint_level.][68725]
2364 [67332]: https://github.com/rust-lang/rust/pull/67332/
2365 [67429]: https://github.com/rust-lang/rust/pull/67429/
2366 [67637]: https://github.com/rust-lang/rust/pull/67637/
2367 [67642]: https://github.com/rust-lang/rust/pull/67642/
2368 [67878]: https://github.com/rust-lang/rust/pull/67878/
2369 [67885]: https://github.com/rust-lang/rust/pull/67885/
2370 [68129]: https://github.com/rust-lang/rust/pull/68129/
2371 [68672]: https://github.com/rust-lang/rust/pull/68672/
2372 [68725]: https://github.com/rust-lang/rust/pull/68725/
2373 [68728]: https://github.com/rust-lang/rust/pull/68728/
2374 [68738]: https://github.com/rust-lang/rust/pull/68738/
2375 [68742]: https://github.com/rust-lang/rust/pull/68742/
2376 [68764]: https://github.com/rust-lang/rust/pull/68764/
2377 [68772]: https://github.com/rust-lang/rust/pull/68772/
2378 [68943]: https://github.com/rust-lang/rust/pull/68943/
2379 [68952]: https://github.com/rust-lang/rust/pull/68952/
2380 [68966]: https://github.com/rust-lang/rust/pull/68966/
2381 [68984]: https://github.com/rust-lang/rust/pull/68984/
2382 [69022]: https://github.com/rust-lang/rust/pull/69022/
2383 [69185]: https://github.com/rust-lang/rust/pull/69185/
2384 [69194]: https://github.com/rust-lang/rust/pull/69194/
2385 [69201]: https://github.com/rust-lang/rust/pull/69201/
2386 [69227]: https://github.com/rust-lang/rust/pull/69227/
2387 [69548]: https://github.com/rust-lang/rust/pull/69548/
2388 [69256]: https://github.com/rust-lang/rust/pull/69256/
2389 [69361]: https://github.com/rust-lang/rust/pull/69361/
2390 [69366]: https://github.com/rust-lang/rust/pull/69366/
2391 [69538]: https://github.com/rust-lang/rust/pull/69538/
2392 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2393 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2394 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2395 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2396 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2397 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2398 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2399 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2402 Version 1.42.0 (2020-03-12)
2403 ==========================
2407 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2409 fn foo(words: &[&str]) {
2411 ["Hello", "World", "!", ..] => println!("Hello World!"),
2412 ["Foo", "Bar", ..] => println!("Baz"),
2413 rest => println!("{:?}", rest),
2417 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2418 that you can create an enum that has the exact layout and ABI of the type
2420 - [You can now use outer attribute procedural macros on inline modules.][64273]
2421 - [There are some *syntax-only* changes:][67131]
2422 - `default` is syntactically allowed before items in `trait` definitions.
2423 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2424 leave out their bodies in favor of `;`.
2425 - Bounds on associated types in `impl`s are now syntactically allowed
2426 (e.g. `type Foo: Ord;`).
2427 - `...` (the C-variadic type) may occur syntactically directly as the type of
2428 any function parameter.
2430 These are still rejected *semantically*, so you will likely receive an error
2431 but these changes can be seen and parsed by procedural macros and
2432 conditional compilation.
2436 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2437 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2438 - [`Option::{expect,unwrap}` and
2439 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2440 pointing to the location where they were called, rather than
2441 `core`'s internals. ][67887]
2443 \* Refer to Rust's [platform support page][platform-support-doc] for more
2444 information on Rust's tiered platform support.
2448 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2449 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2450 to implement `Sized`.][67935]
2451 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2452 - [`Layout::new` is now `const`.][66254]
2453 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2458 - [`CondVar::wait_while`]
2459 - [`CondVar::wait_timeout_while`]
2461 - [`DebugMap::value`]
2462 - [`ManuallyDrop::take`]
2464 - [`ptr::slice_from_raw_parts_mut`]
2465 - [`ptr::slice_from_raw_parts`]
2469 - [You no longer need to include `extern crate proc_macro;` to be able to
2470 `use proc_macro;` in the `2018` edition.][cargo/7700]
2474 - [`Error::description` has been deprecated, and its use will now produce a
2475 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2477 [68253]: https://github.com/rust-lang/rust/pull/68253/
2478 [68348]: https://github.com/rust-lang/rust/pull/68348/
2479 [67935]: https://github.com/rust-lang/rust/pull/67935/
2480 [68339]: https://github.com/rust-lang/rust/pull/68339/
2481 [68122]: https://github.com/rust-lang/rust/pull/68122/
2482 [64273]: https://github.com/rust-lang/rust/pull/64273/
2483 [67712]: https://github.com/rust-lang/rust/pull/67712/
2484 [67887]: https://github.com/rust-lang/rust/pull/67887/
2485 [67131]: https://github.com/rust-lang/rust/pull/67131/
2486 [67233]: https://github.com/rust-lang/rust/pull/67233/
2487 [66899]: https://github.com/rust-lang/rust/pull/66899/
2488 [66919]: https://github.com/rust-lang/rust/pull/66919/
2489 [66254]: https://github.com/rust-lang/rust/pull/66254/
2490 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2491 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2492 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2493 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2494 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2495 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2496 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2497 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2498 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2501 Version 1.41.1 (2020-02-27)
2502 ===========================
2504 * [Always check types of static items][69145]
2505 * [Always check lifetime bounds of `Copy` impls][69145]
2506 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2508 [69225]: https://github.com/rust-lang/rust/issues/69225
2509 [69145]: https://github.com/rust-lang/rust/pull/69145
2512 Version 1.41.0 (2020-01-30)
2513 ===========================
2518 - [You can now pass type parameters to foreign items when implementing
2519 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2520 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2521 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2522 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2523 - [You can now use any valid identifier in a `format_args` macro.][66847]
2524 Previously identifiers starting with an underscore were not allowed.
2525 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2526 enum variants.][66183] These are still rejected semantically, but
2527 can be seen and parsed by procedural macros and conditional compilation.
2528 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2529 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2530 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2532 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2537 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2538 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2539 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2540 - [You can now pass an arguments file passing the `@path` syntax
2541 to rustc.][66172] Note that the format differs somewhat from what is
2542 found in other tooling; please see [the documentation][argfile-docs] for
2544 - [You can now provide `--extern` flag without a path, indicating that it is
2545 available from the search path or specified with an `-L` flag.][64882]
2547 \* Refer to Rust's [platform support page][platform-support-doc] for more
2548 information on Rust's tiered platform support.
2550 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2555 - [The `core::panic` module is now stable.][66771] It was already stable
2557 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2558 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2559 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2564 - [`Result::map_or`]
2565 - [`Result::map_or_else`]
2566 - [`std::rc::Weak::weak_count`]
2567 - [`std::rc::Weak::strong_count`]
2568 - [`std::sync::Weak::weak_count`]
2569 - [`std::sync::Weak::strong_count`]
2574 - [Cargo will now document all the private items for binary crates
2575 by default.][cargo/7593]
2576 - [`cargo-install` will now reinstall the package if it detects that it is out
2577 of date.][cargo/7560]
2578 - [Cargo.lock now uses a more git friendly format that should help to reduce
2579 merge conflicts.][cargo/7579]
2580 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2581 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2582 optimisation level to `2` for debug builds. You can also use
2583 `[profile.<profile>.build-override]` to override build scripts and
2589 - [You can now specify `edition` in documentation code blocks to compile the block
2590 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2591 should be compiled the 2018 edition of Rust.
2592 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2593 current theme with `--check-theme`.][54733]
2594 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2599 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2600 Apple targets.][apple-32bit-drop] This means that the source code is still
2601 available to build, but the targets are no longer being tested and release
2602 binaries for those platforms will no longer be distributed by the Rust project.
2603 Please refer to the linked blog post for more information.
2605 [54733]: https://github.com/rust-lang/rust/pull/54733/
2606 [61351]: https://github.com/rust-lang/rust/pull/61351/
2607 [62514]: https://github.com/rust-lang/rust/pull/62514/
2608 [67255]: https://github.com/rust-lang/rust/pull/67255/
2609 [66661]: https://github.com/rust-lang/rust/pull/66661/
2610 [66771]: https://github.com/rust-lang/rust/pull/66771/
2611 [66847]: https://github.com/rust-lang/rust/pull/66847/
2612 [66238]: https://github.com/rust-lang/rust/pull/66238/
2613 [66277]: https://github.com/rust-lang/rust/pull/66277/
2614 [66325]: https://github.com/rust-lang/rust/pull/66325/
2615 [66172]: https://github.com/rust-lang/rust/pull/66172/
2616 [66183]: https://github.com/rust-lang/rust/pull/66183/
2617 [65879]: https://github.com/rust-lang/rust/pull/65879/
2618 [65013]: https://github.com/rust-lang/rust/pull/65013/
2619 [64882]: https://github.com/rust-lang/rust/pull/64882/
2620 [64325]: https://github.com/rust-lang/rust/pull/64325/
2621 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2622 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2623 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2624 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2625 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2626 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2627 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2628 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2629 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2630 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2631 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2633 Version 1.40.0 (2019-12-19)
2634 ===========================
2638 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2639 `const` contexts.][65188] e.g.
2642 pub struct Point(i32, i32);
2644 const ORIGIN: Point = {
2645 let constructor = Point;
2651 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2652 indicate that there may be variants or fields added in the future.][64639]
2653 For example this requires adding a wild-card branch (`_ => {}`) to any match
2654 statements on a non-exhaustive `enum`. [(RFC 2008)]
2655 - [You can now use function-like procedural macros in `extern` blocks and in
2656 type positions.][63931] e.g. `type Generated = macro!();`
2657 - [Function-like and attribute procedural macros can now emit
2658 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2659 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2660 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2661 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2665 - [Added tier 3 support\* for the
2666 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2667 - [Added tier 3 support for the
2668 `aarch64-unknown-none-softfloat` target.][64589]
2669 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2670 `mips64el-unknown-linux-muslabi64` targets.][65843]
2672 \* Refer to Rust's [platform support page][platform-support-doc] for more
2673 information on Rust's tiered platform support.
2677 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2681 - [`BTreeMap::get_key_value`]
2682 - [`HashMap::get_key_value`]
2683 - [`Option::as_deref_mut`]
2684 - [`Option::as_deref`]
2685 - [`Option::flatten`]
2686 - [`UdpSocket::peer_addr`]
2687 - [`f32::to_be_bytes`]
2688 - [`f32::to_le_bytes`]
2689 - [`f32::to_ne_bytes`]
2690 - [`f64::to_be_bytes`]
2691 - [`f64::to_le_bytes`]
2692 - [`f64::to_ne_bytes`]
2693 - [`f32::from_be_bytes`]
2694 - [`f32::from_le_bytes`]
2695 - [`f32::from_ne_bytes`]
2696 - [`f64::from_be_bytes`]
2697 - [`f64::from_le_bytes`]
2698 - [`f64::from_ne_bytes`]
2705 - [Cargo will now always display warnings, rather than only on
2706 fresh builds.][cargo/7450]
2707 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2708 now produce an error.][cargo/7507] Previously these flags were ignored.
2709 - [You can now publish `dev-dependencies` without including
2710 a `version`.][cargo/7333]
2714 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2715 when running documentation tests with `rustdoc`.][63803]
2719 - [As previously announced, any previous NLL warnings in the 2015 edition are
2720 now hard errors.][64221]
2721 - [The `include!` macro will now warn if it failed to include the
2722 entire file.][64284] The `include!` macro unintentionally only includes the
2723 first _expression_ in a file, and this can be unintuitive. This will become
2724 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2725 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2726 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2727 or `extern` blocks now correctly emits a hard error.
2729 [65294]: https://github.com/rust-lang/rust/pull/65294/
2730 [66103]: https://github.com/rust-lang/rust/pull/66103/
2731 [65843]: https://github.com/rust-lang/rust/pull/65843/
2732 [65188]: https://github.com/rust-lang/rust/pull/65188/
2733 [65092]: https://github.com/rust-lang/rust/pull/65092/
2734 [64589]: https://github.com/rust-lang/rust/pull/64589/
2735 [64639]: https://github.com/rust-lang/rust/pull/64639/
2736 [64221]: https://github.com/rust-lang/rust/pull/64221/
2737 [64284]: https://github.com/rust-lang/rust/pull/64284/
2738 [63931]: https://github.com/rust-lang/rust/pull/63931/
2739 [64035]: https://github.com/rust-lang/rust/pull/64035/
2740 [63674]: https://github.com/rust-lang/rust/pull/63674/
2741 [63803]: https://github.com/rust-lang/rust/pull/63803/
2742 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2743 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2744 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2745 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2746 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2747 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2748 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2749 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2750 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2751 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2752 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2753 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2754 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2755 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2756 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2757 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2758 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2759 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2760 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2761 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2762 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2763 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2764 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2765 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2766 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2769 Version 1.39.0 (2019-11-07)
2770 ===========================
2774 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2775 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2776 - [You can now use certain attributes on function, closure, and function pointer
2777 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2778 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2779 attributes applied to items. e.g.
2782 #[cfg(windows)] slice: &[u16],
2783 #[cfg(not(windows))] slice: &[u8],
2788 - [You can now take shared references to bind-by-move patterns in the `if` guards
2789 of `match` arms.][63118] e.g.
2792 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2796 // ---- `nums` is bound by move.
2797 if nums.iter().sum::<u8>() == 10
2798 // ^------ `.iter()` implicitly takes a reference to `nums`.
2801 // ----------- Legal as `nums` was bound by move and so we have ownership.
2803 _ => unreachable!(),
2812 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2813 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2814 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2815 **Note** Cargo currently doesn't use this feature. Refer to
2816 [cargo#7315][cargo/7315] to track this feature's progress.
2817 - [You can now pass `--show-output` argument to test binaries to print the
2818 output of successful tests.][62600]
2821 \* Refer to Rust's [platform support page][platform-support-doc] for more
2822 information on Rust's tiered platform support.
2826 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2827 - [`LinkedList::new` is now a `const` function.][63684]
2828 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2829 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2830 now `const`.][63786]
2834 - [`Pin::into_inner`]
2835 - [`Instant::checked_duration_since`]
2836 - [`Instant::saturating_duration_since`]
2840 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2841 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2842 `--all` is now deprecated.
2846 - [You can now pass `-Clinker` to rustdoc to control the linker used
2847 for compiling doctests.][63834]
2851 - [Code that was previously accepted by the old borrow checker, but rejected by
2852 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2853 previously a warning, and will also become a hard error in the Rust 2015
2854 edition in the 1.40.0 release.
2855 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2856 run tests.][63827] This should improve performance when running a large
2858 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2859 recommended to use the `?` operator instead.
2860 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2863 [62600]: https://github.com/rust-lang/rust/pull/62600/
2864 [62672]: https://github.com/rust-lang/rust/pull/62672/
2865 [63118]: https://github.com/rust-lang/rust/pull/63118/
2866 [63209]: https://github.com/rust-lang/rust/pull/63209/
2867 [63402]: https://github.com/rust-lang/rust/pull/63402/
2868 [63565]: https://github.com/rust-lang/rust/pull/63565/
2869 [63595]: https://github.com/rust-lang/rust/pull/63595/
2870 [63684]: https://github.com/rust-lang/rust/pull/63684/
2871 [63698]: https://github.com/rust-lang/rust/pull/63698/
2872 [63770]: https://github.com/rust-lang/rust/pull/63770/
2873 [63786]: https://github.com/rust-lang/rust/pull/63786/
2874 [63827]: https://github.com/rust-lang/rust/pull/63827/
2875 [63834]: https://github.com/rust-lang/rust/pull/63834/
2876 [64010]: https://github.com/rust-lang/rust/pull/64010/
2877 [64028]: https://github.com/rust-lang/rust/pull/64028/
2878 [64334]: https://github.com/rust-lang/rust/pull/64334/
2879 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2880 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2881 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2882 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2883 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2884 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2886 Version 1.38.0 (2019-09-26)
2887 ==========================
2891 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2892 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2896 - [Added pipelined compilation support to `rustc`.][62766] This will
2897 improve compilation times in some cases. For further information please refer
2898 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2899 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2900 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2901 `x86_64-uwp-windows-msvc` targets.][60260]
2902 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2903 `armv7-unknown-linux-musleabi` targets.][63107]
2904 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2905 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2906 - [Upgraded to LLVM 9.][62592]
2908 \* Refer to Rust's [platform support page][platform-support-doc] for more
2909 information on Rust's tiered platform support.
2913 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2914 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2915 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2916 is available at `std::clone::Clone`). This also makes all built-in macros
2917 available in `std`/`core` root. e.g. `std::include_bytes!`.
2918 - [`str::Chars` now implements `Debug`.][63000]
2919 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2920 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2921 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2922 - [Added euclidean remainder and division operations (`div_euclid`,
2923 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2924 `overflowing`, and `wrapping` versions are available for all
2926 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2927 `PartialEq`.][61491]
2928 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2932 - [`<*const T>::cast`]
2933 - [`<*mut T>::cast`]
2934 - [`Duration::as_secs_f32`]
2935 - [`Duration::as_secs_f64`]
2936 - [`Duration::div_f32`]
2937 - [`Duration::div_f64`]
2938 - [`Duration::from_secs_f32`]
2939 - [`Duration::from_secs_f64`]
2940 - [`Duration::mul_f32`]
2941 - [`Duration::mul_f64`]
2942 - [`any::type_name`]
2946 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2947 - [You can now pass the `--features` option multiple times to enable
2948 multiple features.][cargo/7084]
2953 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2957 - [`rustc` will now warn about some incorrect uses of
2958 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2962 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2964 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2965 issues][62896] with certain crates such as libc.
2967 [60260]: https://github.com/rust-lang/rust/pull/60260/
2968 [61457]: https://github.com/rust-lang/rust/pull/61457/
2969 [61491]: https://github.com/rust-lang/rust/pull/61491/
2970 [61884]: https://github.com/rust-lang/rust/pull/61884/
2971 [61953]: https://github.com/rust-lang/rust/pull/61953/
2972 [62042]: https://github.com/rust-lang/rust/pull/62042/
2973 [62528]: https://github.com/rust-lang/rust/pull/62528/
2974 [62583]: https://github.com/rust-lang/rust/pull/62583/
2975 [62735]: https://github.com/rust-lang/rust/pull/62735/
2976 [62766]: https://github.com/rust-lang/rust/pull/62766/
2977 [62784]: https://github.com/rust-lang/rust/pull/62784/
2978 [62592]: https://github.com/rust-lang/rust/pull/62592/
2979 [62785]: https://github.com/rust-lang/rust/issues/62785/
2980 [62814]: https://github.com/rust-lang/rust/pull/62814/
2981 [62896]: https://github.com/rust-lang/rust/issues/62896/
2982 [63000]: https://github.com/rust-lang/rust/pull/63000/
2983 [63056]: https://github.com/rust-lang/rust/pull/63056/
2984 [63107]: https://github.com/rust-lang/rust/pull/63107/
2985 [63346]: https://github.com/rust-lang/rust/pull/63346/
2986 [63421]: https://github.com/rust-lang/rust/pull/63421/
2987 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2988 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2989 [63048]: https://github.com/rust-lang/rust/pull/63048
2990 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2991 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2992 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2993 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2994 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2995 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2996 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2997 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2998 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2999 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3000 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3001 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3002 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3004 Version 1.37.0 (2019-08-15)
3005 ==========================
3009 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3010 [`Box`][62228], or an [array][62235] and unused.
3011 - [You can now use the `cfg` and `cfg_attr` attributes on
3012 generic parameters.][61547]
3013 - [You can now use enum variants through type alias.][61682] e.g. You can
3014 write the following:
3016 type MyOption = Option<u8>;
3018 fn increment_or_zero(x: MyOption) -> u8 {
3020 MyOption::Some(y) => y + 1,
3021 MyOption::None => 0,
3025 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3026 `const _: u32 = 5;`.
3027 - [You can now use `#[repr(align(X)]` on enums.][61229]
3028 - [The `?` Kleene macro operator is now available in the
3029 2015 edition.][60932]
3033 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3034 and `-C profile-use` flags.][61268] For more information on how to use profile
3035 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3036 - [The `rust-lldb` wrapper script should now work again.][61827]
3040 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3044 - [`BufReader::buffer`]
3045 - [`BufWriter::buffer`]
3046 - [`Cell::from_mut`]
3047 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3048 - [`DoubleEndedIterator::nth_back`]
3050 - [`Wrapping::reverse_bits`]
3051 - [`i128::reverse_bits`]
3052 - [`i16::reverse_bits`]
3053 - [`i32::reverse_bits`]
3054 - [`i64::reverse_bits`]
3055 - [`i8::reverse_bits`]
3056 - [`isize::reverse_bits`]
3057 - [`slice::copy_within`]
3058 - [`u128::reverse_bits`]
3059 - [`u16::reverse_bits`]
3060 - [`u32::reverse_bits`]
3061 - [`u64::reverse_bits`]
3062 - [`u8::reverse_bits`]
3063 - [`usize::reverse_bits`]
3067 - [`Cargo.lock` files are now included by default when publishing executable crates
3068 with executables.][cargo/7026]
3069 - [You can now specify `default-run="foo"` in `[package]` to specify the
3070 default executable to use for `cargo run`.][cargo/7056]
3077 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3078 Please transition your code to using the `..=` syntax for inclusive
3080 - [Using a trait object without the `dyn` will now warn by default.][61203]
3081 Please transition your code to use `dyn Trait` for trait objects instead.
3083 [62228]: https://github.com/rust-lang/rust/pull/62228/
3084 [62235]: https://github.com/rust-lang/rust/pull/62235/
3085 [61802]: https://github.com/rust-lang/rust/pull/61802/
3086 [61827]: https://github.com/rust-lang/rust/pull/61827/
3087 [61547]: https://github.com/rust-lang/rust/pull/61547/
3088 [61682]: https://github.com/rust-lang/rust/pull/61682/
3089 [61268]: https://github.com/rust-lang/rust/pull/61268/
3090 [61342]: https://github.com/rust-lang/rust/pull/61342/
3091 [61347]: https://github.com/rust-lang/rust/pull/61347/
3092 [61100]: https://github.com/rust-lang/rust/pull/61100/
3093 [61203]: https://github.com/rust-lang/rust/pull/61203/
3094 [61229]: https://github.com/rust-lang/rust/pull/61229/
3095 [60932]: https://github.com/rust-lang/rust/pull/60932/
3096 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3097 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3098 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3099 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3100 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3101 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3102 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3103 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3104 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3105 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3106 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3107 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3108 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3109 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3110 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3111 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3112 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3113 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3114 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3115 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3116 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3117 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3118 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3121 Version 1.36.0 (2019-07-04)
3122 ==========================
3126 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3127 - [The order of traits in trait objects no longer affects the semantics of that
3128 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3129 `dyn fmt::Debug + Send`, where this was previously not the case.
3133 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3134 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3135 - [`mem::needs_drop` is now available as a const fn.][60364]
3136 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3137 - [`String` now implements `BorrowMut<str>`.][60404]
3138 - [`io::Cursor` now implements `Default`.][60234]
3139 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3140 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3141 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3142 environment has access to heap memory allocation.
3143 - [`String` now implements `From<&String>`.][59825]
3144 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3145 return a tuple of each argument when there is multiple arguments.
3146 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3151 - [`VecDeque::rotate_left`]
3152 - [`VecDeque::rotate_right`]
3153 - [`Iterator::copied`]
3155 - [`io::IoSliceMut`]
3156 - [`Read::read_vectored`]
3157 - [`Write::write_vectored`]
3158 - [`str::as_mut_ptr`]
3159 - [`mem::MaybeUninit`]
3160 - [`pointer::align_offset`]
3161 - [`future::Future`]
3163 - [`task::RawWaker`]
3164 - [`task::RawWakerVTable`]
3170 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3171 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3173 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3177 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3184 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3185 longer recommended, and will be deprecated in 1.39.0.
3187 [60318]: https://github.com/rust-lang/rust/pull/60318/
3188 [60364]: https://github.com/rust-lang/rust/pull/60364/
3189 [60370]: https://github.com/rust-lang/rust/pull/60370/
3190 [60404]: https://github.com/rust-lang/rust/pull/60404/
3191 [60234]: https://github.com/rust-lang/rust/pull/60234/
3192 [60244]: https://github.com/rust-lang/rust/pull/60244/
3193 [58623]: https://github.com/rust-lang/rust/pull/58623/
3194 [59648]: https://github.com/rust-lang/rust/pull/59648/
3195 [59675]: https://github.com/rust-lang/rust/pull/59675/
3196 [59825]: https://github.com/rust-lang/rust/pull/59825/
3197 [59826]: https://github.com/rust-lang/rust/pull/59826/
3198 [59445]: https://github.com/rust-lang/rust/pull/59445/
3199 [59114]: https://github.com/rust-lang/rust/pull/59114/
3200 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3201 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3202 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3203 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3204 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3205 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3206 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3207 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3208 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3209 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3210 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3211 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3212 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3213 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3214 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3215 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3216 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3217 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3218 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3219 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3222 Version 1.35.0 (2019-05-23)
3223 ==========================
3227 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3228 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3229 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3231 unsafe fn call_unsafe(func: unsafe fn()) {
3236 unsafe { call_unsafe(|| {}); }
3243 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3244 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3245 - [Added the `wasm32-unknown-wasi` target.][59464]
3250 - [`Thread` will now show its ID in `Debug` output.][59460]
3251 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3252 - [`alloc::System` now implements `Default`.][59451]
3253 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3255 - [`char::{ToLowercase, ToUppercase}` now
3256 implement `ExactSizeIterator`.][58778]
3257 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3258 - [Removed the `Read` trait bounds
3259 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3260 - [You can now call the `dbg!` macro without any parameters to print the file
3261 and line where it is called.][57847]
3262 - [In place ASCII case conversions are now up to 4× faster.][59283]
3263 e.g. `str::make_ascii_lowercase`
3264 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3271 - [`RefCell::replace_with`]
3272 - [`RefCell::map_split`]
3274 - [`Range::contains`]
3275 - [`RangeFrom::contains`]
3276 - [`RangeTo::contains`]
3277 - [`RangeInclusive::contains`]
3278 - [`RangeToInclusive::contains`]
3279 - [`Option::copied`]
3283 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3284 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3289 - [The Rust toolchain is now available natively for musl based distros.][58575]
3291 [59460]: https://github.com/rust-lang/rust/pull/59460/
3292 [59464]: https://github.com/rust-lang/rust/pull/59464/
3293 [59500]: https://github.com/rust-lang/rust/pull/59500/
3294 [59512]: https://github.com/rust-lang/rust/pull/59512/
3295 [59580]: https://github.com/rust-lang/rust/pull/59580/
3296 [59283]: https://github.com/rust-lang/rust/pull/59283/
3297 [59451]: https://github.com/rust-lang/rust/pull/59451/
3298 [59076]: https://github.com/rust-lang/rust/pull/59076/
3299 [58778]: https://github.com/rust-lang/rust/pull/58778/
3300 [58717]: https://github.com/rust-lang/rust/pull/58717/
3301 [58369]: https://github.com/rust-lang/rust/pull/58369/
3302 [58423]: https://github.com/rust-lang/rust/pull/58423/
3303 [58080]: https://github.com/rust-lang/rust/pull/58080/
3304 [57847]: https://github.com/rust-lang/rust/pull/57847/
3305 [58575]: https://github.com/rust-lang/rust/pull/58575
3306 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3307 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3308 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3309 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3310 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3311 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3312 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3313 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3314 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3315 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3316 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3317 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3319 Version 1.34.2 (2019-05-14)
3320 ===========================
3322 * [Destabilize the `Error::type_id` function due to a security
3323 vulnerability][60785] ([CVE-2019-12083])
3325 [60785]: https://github.com/rust-lang/rust/pull/60785
3326 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3328 Version 1.34.1 (2019-04-25)
3329 ===========================
3331 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3332 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3333 * [Fix Clippy panic when checking some macros][clippy/3805]
3335 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3336 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3337 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3339 Version 1.34.0 (2019-04-11)
3340 ==========================
3344 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3345 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3347 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3348 `#[attr{}]` procedural macros.][57367]
3349 - [You can now write `extern crate self as foo;`][57407] to import your
3350 crate's root into the extern prelude.
3355 - [You can now target `riscv64imac-unknown-none-elf` and
3356 `riscv64gc-unknown-none-elf`.][58406]
3357 - [You can now enable linker plugin LTO optimisations with
3358 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3359 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3361 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3366 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3367 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3368 the `Hash` trait to create an iterator.
3369 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3370 methods.][58421] Most notably you no longer require the `Ord` trait to create
3372 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3373 for all numeric types.][58044]
3374 - [Indexing a `str` is now generic over all types that
3375 implement `SliceIndex<str>`.][57604]
3376 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3377 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3378 produce a warning if their returning type is unused.
3379 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3380 `overflowing_pow` are now available for all numeric types.][57873] These are
3381 equivalent to methods such as `wrapping_add` for the `pow` operation.
3389 * [`Error::type_id`]
3390 * [`atomic::AtomicI16`]
3391 * [`atomic::AtomicI32`]
3392 * [`atomic::AtomicI64`]
3393 * [`atomic::AtomicI8`]
3394 * [`atomic::AtomicU16`]
3395 * [`atomic::AtomicU32`]
3396 * [`atomic::AtomicU64`]
3397 * [`atomic::AtomicU8`]
3398 * [`convert::Infallible`]
3399 * [`convert::TryFrom`]
3400 * [`convert::TryInto`]
3402 * [`iter::successors`]
3403 * [`num::NonZeroI128`]
3404 * [`num::NonZeroI16`]
3405 * [`num::NonZeroI32`]
3406 * [`num::NonZeroI64`]
3407 * [`num::NonZeroI8`]
3408 * [`num::NonZeroIsize`]
3409 * [`slice::sort_by_cached_key`]
3410 * [`str::escape_debug`]
3411 * [`str::escape_default`]
3412 * [`str::escape_unicode`]
3413 * [`str::split_ascii_whitespace`]
3416 * [`Instant::checked_add`]
3417 * [`Instant::checked_sub`]
3418 * [`SystemTime::checked_add`]
3419 * [`SystemTime::checked_sub`]
3423 - [You can now use alternative registries to crates.io.][cargo/6654]
3427 - [You can now use the `?` operator in your documentation tests without manually
3428 adding `fn main() -> Result<(), _> {}`.][56470]
3432 - [`Command::before_exec` is being replaced by the unsafe method
3433 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3434 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3435 can now use `const` functions in `static` variables.
3437 [58370]: https://github.com/rust-lang/rust/pull/58370/
3438 [58406]: https://github.com/rust-lang/rust/pull/58406/
3439 [58421]: https://github.com/rust-lang/rust/pull/58421/
3440 [58166]: https://github.com/rust-lang/rust/pull/58166/
3441 [58044]: https://github.com/rust-lang/rust/pull/58044/
3442 [58057]: https://github.com/rust-lang/rust/pull/58057/
3443 [58059]: https://github.com/rust-lang/rust/pull/58059/
3444 [57809]: https://github.com/rust-lang/rust/pull/57809/
3445 [57873]: https://github.com/rust-lang/rust/pull/57873/
3446 [57604]: https://github.com/rust-lang/rust/pull/57604/
3447 [57367]: https://github.com/rust-lang/rust/pull/57367/
3448 [57407]: https://github.com/rust-lang/rust/pull/57407/
3449 [57425]: https://github.com/rust-lang/rust/pull/57425/
3450 [57106]: https://github.com/rust-lang/rust/pull/57106/
3451 [56470]: https://github.com/rust-lang/rust/pull/56470/
3452 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3453 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3454 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3455 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3456 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3457 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3458 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3459 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3460 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3461 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3462 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3463 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3464 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3465 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3466 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3467 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3468 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3469 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3470 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3471 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3472 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3473 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3474 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3475 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3476 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3477 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3478 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3479 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3480 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3481 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3482 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3485 Version 1.33.0 (2019-02-28)
3486 ==========================
3490 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3491 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3492 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3493 E.g. You can have match statement on a `u8` that covers `0..=255` and
3494 you would no longer be required to have a `_ => unreachable!()` case.
3495 - [You can now have multiple patterns in `if let` and `while let`
3496 expressions.][57532] You can do this with the same syntax as a `match`
3506 let state = Creature::Crab("Ferris");
3508 if let Creature::Crab(name) | Creature::Person(name) = state {
3509 println!("This creature's name is: {}", name);
3513 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3514 this feature will by default produce a warning as this behaviour can be
3515 unintuitive. E.g. `if let _ = 5 {}`
3516 - [You can now use `let` bindings, assignments, expression statements,
3517 and irrefutable pattern destructuring in const functions.][57175]
3518 - [You can now call unsafe const functions.][57067] E.g.
3520 const unsafe fn foo() -> i32 { 5 }
3521 const fn bar() -> i32 {
3525 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3526 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3527 - [You can now specify a specific alignment with the `#[repr(packed)]`
3528 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3529 with an alignment of 2 bytes and a size of 6 bytes.
3530 - [You can now import an item from a module as an `_`.][56303] This allows you to
3531 import a trait's impls, and not have the name in the namespace. E.g.
3533 use std::io::Read as _;
3535 // Allowed as there is only one `Read` in the module.
3538 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3542 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3543 command line argument.][56351]
3544 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3545 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3546 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3547 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3548 information on Rust's platform support.
3549 - [Added support for the `thumbv7neon-linux-androideabi` and
3550 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3551 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3555 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3556 functions for all numeric types.][57566]
3557 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3558 are now `const` functions for all numeric types.][57105]
3559 - [The methods `is_positive` and `is_negative` are now `const` functions for
3560 all signed numeric types.][57105]
3561 - [The `get` method for all `NonZero` types is now `const`.][57167]
3562 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3563 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3564 numeric types.][57234]
3565 - [`Ipv4Addr::new` is now a `const` function][57234]
3569 - [`unix::FileExt::read_exact_at`]
3570 - [`unix::FileExt::write_all_at`]
3571 - [`Option::transpose`]
3572 - [`Result::transpose`]
3573 - [`convert::identity`]
3576 - [`marker::PhantomPinned`]
3577 - [`Vec::resize_with`]
3578 - [`VecDeque::resize_with`]
3579 - [`Duration::as_millis`]
3580 - [`Duration::as_micros`]
3581 - [`Duration::as_nanos`]
3586 - [You can now publish crates that require a feature flag to compile with
3587 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3588 - [Cargo should now rebuild a crate if a file was modified during the initial
3593 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3594 are now deprecated in the standard library, and their usage will now produce a warning.
3595 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3597 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3599 - [Libtest no longer creates a new thread for each test when
3600 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3602 [56243]: https://github.com/rust-lang/rust/pull/56243
3603 [56303]: https://github.com/rust-lang/rust/pull/56303/
3604 [56351]: https://github.com/rust-lang/rust/pull/56351/
3605 [56362]: https://github.com/rust-lang/rust/pull/56362
3606 [56642]: https://github.com/rust-lang/rust/pull/56642/
3607 [56769]: https://github.com/rust-lang/rust/pull/56769/
3608 [56805]: https://github.com/rust-lang/rust/pull/56805
3609 [56947]: https://github.com/rust-lang/rust/pull/56947/
3610 [57049]: https://github.com/rust-lang/rust/pull/57049/
3611 [57067]: https://github.com/rust-lang/rust/pull/57067/
3612 [57105]: https://github.com/rust-lang/rust/pull/57105
3613 [57130]: https://github.com/rust-lang/rust/pull/57130/
3614 [57167]: https://github.com/rust-lang/rust/pull/57167/
3615 [57175]: https://github.com/rust-lang/rust/pull/57175/
3616 [57234]: https://github.com/rust-lang/rust/pull/57234/
3617 [57332]: https://github.com/rust-lang/rust/pull/57332/
3618 [57465]: https://github.com/rust-lang/rust/pull/57465/
3619 [57532]: https://github.com/rust-lang/rust/pull/57532/
3620 [57535]: https://github.com/rust-lang/rust/pull/57535/
3621 [57566]: https://github.com/rust-lang/rust/pull/57566/
3622 [57615]: https://github.com/rust-lang/rust/pull/57615/
3623 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3624 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3625 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3626 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3627 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3628 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3629 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3630 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3631 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3632 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3633 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3634 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3635 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3636 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3637 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3638 [platform-support]: https://forge.rust-lang.org/platform-support.html
3640 Version 1.32.0 (2019-01-17)
3641 ==========================
3646 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3647 operator allows you to specify zero or one repetitions similar to the `*` and
3649 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3650 now always resolve to the item (`enum`, `struct`, etc.) available in the
3651 module if present, before resolving to a external crate or an item the prelude.][56759]
3654 enum Color { Red, Green, Blue }
3660 - [You can now match against `PhantomData<T>` types.][55837]
3661 - [You can now match against literals in macros with the `literal`
3662 specifier.][56072] This will match against a literal of any type.
3663 E.g. `1`, `'A'`, `"Hello World"`
3664 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3666 struct Point(i32, i32);
3669 pub fn new(x: i32, y: i32) -> Self {
3673 pub fn is_origin(&self) -> bool {
3681 - [Self can also now be used in type definitions.][56366] E.g.
3685 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3688 Cons(T, Box<Self>) // likewise here
3691 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3692 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3696 - [The default allocator has changed from jemalloc to the default allocator on
3697 your system.][55238] The compiler itself on Linux & macOS will still use
3698 jemalloc, but programs compiled with it will use the system allocator.
3699 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3703 - [`PathBuf` now implements `FromStr`.][55148]
3704 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3705 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3706 easily debug expressions in your rust program. E.g.
3709 let b = dbg!(a * 2) + 1;
3710 // ^-- prints: [src/main.rs:4] a * 2 = 4
3714 The following APIs are now `const` functions and can be used in a
3718 - [`UnsafeCell::get`]
3719 - [`char::is_ascii`]
3721 - [`ManuallyDrop::new`]
3722 - [`ManuallyDrop::into_inner`]
3723 - [`RangeInclusive::start`]
3724 - [`RangeInclusive::end`]
3725 - [`NonNull::as_ptr`]
3728 - [`Duration::as_secs`]
3729 - [`Duration::subsec_millis`]
3730 - [`Duration::subsec_micros`]
3731 - [`Duration::subsec_nanos`]
3733 - [`Ipv4Addr::is_unspecified`]
3735 - [`Ipv6Addr::octets`]
3739 - [`i8::to_be_bytes`]
3740 - [`i8::to_le_bytes`]
3741 - [`i8::to_ne_bytes`]
3742 - [`i8::from_be_bytes`]
3743 - [`i8::from_le_bytes`]
3744 - [`i8::from_ne_bytes`]
3745 - [`i16::to_be_bytes`]
3746 - [`i16::to_le_bytes`]
3747 - [`i16::to_ne_bytes`]
3748 - [`i16::from_be_bytes`]
3749 - [`i16::from_le_bytes`]
3750 - [`i16::from_ne_bytes`]
3751 - [`i32::to_be_bytes`]
3752 - [`i32::to_le_bytes`]
3753 - [`i32::to_ne_bytes`]
3754 - [`i32::from_be_bytes`]
3755 - [`i32::from_le_bytes`]
3756 - [`i32::from_ne_bytes`]
3757 - [`i64::to_be_bytes`]
3758 - [`i64::to_le_bytes`]
3759 - [`i64::to_ne_bytes`]
3760 - [`i64::from_be_bytes`]
3761 - [`i64::from_le_bytes`]
3762 - [`i64::from_ne_bytes`]
3763 - [`i128::to_be_bytes`]
3764 - [`i128::to_le_bytes`]
3765 - [`i128::to_ne_bytes`]
3766 - [`i128::from_be_bytes`]
3767 - [`i128::from_le_bytes`]
3768 - [`i128::from_ne_bytes`]
3769 - [`isize::to_be_bytes`]
3770 - [`isize::to_le_bytes`]
3771 - [`isize::to_ne_bytes`]
3772 - [`isize::from_be_bytes`]
3773 - [`isize::from_le_bytes`]
3774 - [`isize::from_ne_bytes`]
3775 - [`u8::to_be_bytes`]
3776 - [`u8::to_le_bytes`]
3777 - [`u8::to_ne_bytes`]
3778 - [`u8::from_be_bytes`]
3779 - [`u8::from_le_bytes`]
3780 - [`u8::from_ne_bytes`]
3781 - [`u16::to_be_bytes`]
3782 - [`u16::to_le_bytes`]
3783 - [`u16::to_ne_bytes`]
3784 - [`u16::from_be_bytes`]
3785 - [`u16::from_le_bytes`]
3786 - [`u16::from_ne_bytes`]
3787 - [`u32::to_be_bytes`]
3788 - [`u32::to_le_bytes`]
3789 - [`u32::to_ne_bytes`]
3790 - [`u32::from_be_bytes`]
3791 - [`u32::from_le_bytes`]
3792 - [`u32::from_ne_bytes`]
3793 - [`u64::to_be_bytes`]
3794 - [`u64::to_le_bytes`]
3795 - [`u64::to_ne_bytes`]
3796 - [`u64::from_be_bytes`]
3797 - [`u64::from_le_bytes`]
3798 - [`u64::from_ne_bytes`]
3799 - [`u128::to_be_bytes`]
3800 - [`u128::to_le_bytes`]
3801 - [`u128::to_ne_bytes`]
3802 - [`u128::from_be_bytes`]
3803 - [`u128::from_le_bytes`]
3804 - [`u128::from_ne_bytes`]
3805 - [`usize::to_be_bytes`]
3806 - [`usize::to_le_bytes`]
3807 - [`usize::to_ne_bytes`]
3808 - [`usize::from_be_bytes`]
3809 - [`usize::from_le_bytes`]
3810 - [`usize::from_ne_bytes`]
3814 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3815 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3819 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3823 - [The argument types for AVX's
3824 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3825 been changed from `*const` to `*mut` as the previous implementation
3829 [55148]: https://github.com/rust-lang/rust/pull/55148/
3830 [55238]: https://github.com/rust-lang/rust/pull/55238/
3831 [55280]: https://github.com/rust-lang/rust/pull/55280/
3832 [55610]: https://github.com/rust-lang/rust/pull/55610/
3833 [55663]: https://github.com/rust-lang/rust/pull/55663/
3834 [55702]: https://github.com/rust-lang/rust/pull/55702/
3835 [55837]: https://github.com/rust-lang/rust/pull/55837/
3836 [55843]: https://github.com/rust-lang/rust/pull/55843/
3837 [56072]: https://github.com/rust-lang/rust/pull/56072/
3838 [56245]: https://github.com/rust-lang/rust/pull/56245/
3839 [56365]: https://github.com/rust-lang/rust/pull/56365/
3840 [56366]: https://github.com/rust-lang/rust/pull/56366/
3841 [56395]: https://github.com/rust-lang/rust/pull/56395/
3842 [56759]: https://github.com/rust-lang/rust/pull/56759/
3843 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3844 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3845 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3846 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3847 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3848 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3849 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3850 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3851 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3852 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3853 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3854 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3855 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3856 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3857 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3858 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3859 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3860 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3861 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3862 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3863 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3864 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3865 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3866 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3867 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3868 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3869 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3870 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3871 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3872 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3873 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3874 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3875 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3876 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3877 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3878 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3879 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3880 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3881 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3882 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3883 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3884 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3885 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3886 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3887 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3888 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3889 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3890 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3891 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3892 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3893 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3894 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3895 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3896 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3897 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3898 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3899 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3900 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3901 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3902 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3903 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3904 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3905 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3906 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3907 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3908 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3909 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3910 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3911 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3912 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3913 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3914 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3915 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3916 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3917 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3918 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3919 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3920 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3921 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3922 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3923 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3924 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3925 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3926 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3927 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3928 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3929 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3930 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3931 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3932 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3933 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3934 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3935 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3938 Version 1.31.1 (2018-12-20)
3939 ===========================
3941 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3942 - [Fix broken go-to-definition in RLS][rls/1171]
3943 - [Fix infinite loop on hover in RLS][rls/1170]
3945 [56562]: https://github.com/rust-lang/rust/pull/56562
3946 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3947 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3949 Version 1.31.0 (2018-12-06)
3950 ==========================
3954 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3955 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3956 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3957 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3959 - [You can now define and use `const` functions.][54835] These are currently
3960 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3961 [language reference][const-reference] for what exactly is available.
3962 - [You can now use tool lints, which allow you to scope lints from external
3963 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3964 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3965 a crate, not just in exported functions.][54451]
3966 - [You can now use parentheses in pattern matches.][54497]
3970 - [Updated musl to 1.1.20][54430]
3974 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3975 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3976 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3977 into `Option<&mut T>` using the `From` trait.][53218]
3978 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3983 - [`slice::align_to`]
3984 - [`slice::align_to_mut`]
3985 - [`slice::chunks_exact`]
3986 - [`slice::chunks_exact_mut`]
3987 - [`slice::rchunks`]
3988 - [`slice::rchunks_mut`]
3989 - [`slice::rchunks_exact`]
3990 - [`slice::rchunks_exact_mut`]
3991 - [`Option::replace`]
3995 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3996 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3997 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3999 [52813]: https://github.com/rust-lang/rust/pull/52813/
4000 [53218]: https://github.com/rust-lang/rust/pull/53218/
4001 [54057]: https://github.com/rust-lang/rust/pull/54057/
4002 [54240]: https://github.com/rust-lang/rust/pull/54240/
4003 [54430]: https://github.com/rust-lang/rust/pull/54430/
4004 [54451]: https://github.com/rust-lang/rust/pull/54451/
4005 [54497]: https://github.com/rust-lang/rust/pull/54497/
4006 [54778]: https://github.com/rust-lang/rust/pull/54778/
4007 [54835]: https://github.com/rust-lang/rust/pull/54835/
4008 [54870]: https://github.com/rust-lang/rust/pull/54870/
4009 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4010 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4011 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4012 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4013 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4014 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4015 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4016 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4017 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4018 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4019 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4020 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4021 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4022 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4024 Version 1.30.1 (2018-11-08)
4025 ===========================
4027 - [Fixed overflow ICE in rustdoc][54199]
4028 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4030 [54199]: https://github.com/rust-lang/rust/pull/54199
4031 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4033 Version 1.30.0 (2018-10-25)
4034 ==========================
4038 - [Procedural macros are now available.][52081] These kinds of macros allow for
4039 more powerful code generation. There is a [new chapter available][proc-macros]
4040 in the Rust Programming Language book that goes further in depth.
4041 - [You can now use keywords as identifiers using the raw identifiers
4042 syntax (`r#`),][53236] e.g. `let r#for = true;`
4043 - [Using anonymous parameters in traits is now deprecated with a warning and
4044 will be a hard error in the 2018 edition.][53272]
4045 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4046 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4047 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4048 Previously, using a external crate in a module without a use statement
4049 required `let json = ::serde_json::from_str(foo);` but can now be written
4050 as `let json = serde_json::from_str(foo);`.
4051 - [You can now apply the `#[used]` attribute to static items to prevent the
4052 compiler from optimising them away, even if they appear to be unused,][51363]
4053 e.g. `#[used] static FOO: u32 = 1;`
4054 - [You can now import and reexport macros from other crates with the `use`
4055 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4056 the root module of the crate. If your macro relies on calling other local
4057 macros, it is recommended to export with the
4058 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4060 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4061 using the `vis` specifier.][53370]
4062 - [Non-macro attributes now allow all forms of literals, not just
4063 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4064 write `#[attr(true)]`.
4065 - [You can now specify a function to handle a panic in the Rust runtime with the
4066 `#[panic_handler]` attribute.][51366]
4070 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4071 - [Added the `aarch64-unknown-netbsd` target][53165]
4072 - [Upgraded to LLVM 8.][53611]
4076 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4080 - [`Ipv4Addr::BROADCAST`]
4081 - [`Ipv4Addr::LOCALHOST`]
4082 - [`Ipv4Addr::UNSPECIFIED`]
4083 - [`Ipv6Addr::LOCALHOST`]
4084 - [`Ipv6Addr::UNSPECIFIED`]
4085 - [`Iterator::find_map`]
4087 The following methods are replacement methods for `trim_left`, `trim_right`,
4088 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4090 - [`str::trim_end_matches`]
4092 - [`str::trim_start_matches`]
4093 - [`str::trim_start`]
4097 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4098 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4099 equivalent to calling `rustdoc --error-format=json`.
4100 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4104 - [`rustdoc` allows you to specify what edition to treat your code as with the
4105 `--edition` option.][54057]
4106 - [`rustdoc` now has the `--color` (specify whether to output color) and
4107 `--error-format` (specify error format, e.g. `json`) options.][53003]
4108 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4109 debug symbols.][53774]
4110 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4111 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4113 [50911]: https://github.com/rust-lang/rust/pull/50911/
4114 [51363]: https://github.com/rust-lang/rust/pull/51363/
4115 [51366]: https://github.com/rust-lang/rust/pull/51366/
4116 [52081]: https://github.com/rust-lang/rust/pull/52081/
4117 [53003]: https://github.com/rust-lang/rust/pull/53003/
4118 [53033]: https://github.com/rust-lang/rust/pull/53033/
4119 [53044]: https://github.com/rust-lang/rust/pull/53044/
4120 [53165]: https://github.com/rust-lang/rust/pull/53165/
4121 [53611]: https://github.com/rust-lang/rust/pull/53611/
4122 [53236]: https://github.com/rust-lang/rust/pull/53236/
4123 [53272]: https://github.com/rust-lang/rust/pull/53272/
4124 [53370]: https://github.com/rust-lang/rust/pull/53370/
4125 [53459]: https://github.com/rust-lang/rust/pull/53459/
4126 [53774]: https://github.com/rust-lang/rust/pull/53774/
4127 [53822]: https://github.com/rust-lang/rust/pull/53822/
4128 [54057]: https://github.com/rust-lang/rust/pull/54057/
4129 [54404]: https://github.com/rust-lang/rust/pull/54404/
4130 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4131 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4132 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4133 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4135 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4136 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4137 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4138 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4139 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4140 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4141 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4142 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4143 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4144 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4147 Version 1.29.2 (2018-10-11)
4148 ===========================
4150 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4151 - The `rls-preview` component on the windows-gnu targets has been restored.
4153 [54639]: https://github.com/rust-lang/rust/pull/54639
4156 Version 1.29.1 (2018-09-25)
4157 ===========================
4162 - The standard library's `str::repeat` function contained an out of bounds write
4163 caused by an integer overflow. This has been fixed by deterministically
4164 panicking when an overflow happens.
4166 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4170 Version 1.29.0 (2018-09-13)
4171 ==========================
4175 - [Bumped minimum LLVM version to 5.0.][51899]
4176 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4177 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4178 - [Upgraded to LLVM 7.][51966]
4182 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4183 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4184 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4185 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4187 - [`Cell<T>` now allows `T` to be unsized.][50494]
4188 - [`SocketAddr` is now stable on Redox.][52656]
4193 - [`Iterator::flatten`]
4198 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4199 `--locked` to disable this behavior.
4200 - [`cargo-install` will now allow you to cross compile an install
4201 using `--target`.][cargo/5614]
4202 - [Added the `cargo-fix` subcommand to automatically move project code from
4203 2015 edition to 2018.][cargo/5723]
4204 - [`cargo doc` can now optionally document private types using the
4205 `--document-private-items` flag.][cargo/5543]
4209 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4210 the specified level to that level.][52354] For example `--cap-lints warn`
4211 will demote `deny` and `forbid` lints to `warn`.
4212 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4213 fails and `101` if there is a panic.][52197]
4214 - [A preview of clippy has been made available through rustup.][51122]
4215 You can install the preview with `rustup component add clippy-preview`.
4219 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4220 Use `str::get_unchecked(begin..end)` instead.
4221 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4222 Consider using the `home_dir` function from
4223 https://crates.io/crates/dirs instead.
4224 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4225 - [`cfg` attributes and `--cfg` command line flags are now more
4226 strictly validated.][53893]
4228 [53893]: https://github.com/rust-lang/rust/pull/53893/
4229 [52861]: https://github.com/rust-lang/rust/pull/52861/
4230 [51966]: https://github.com/rust-lang/rust/pull/51966/
4231 [52656]: https://github.com/rust-lang/rust/pull/52656/
4232 [52239]: https://github.com/rust-lang/rust/pull/52239/
4233 [52330]: https://github.com/rust-lang/rust/pull/52330/
4234 [52354]: https://github.com/rust-lang/rust/pull/52354/
4235 [52402]: https://github.com/rust-lang/rust/pull/52402/
4236 [52197]: https://github.com/rust-lang/rust/pull/52197/
4237 [51807]: https://github.com/rust-lang/rust/pull/51807/
4238 [51899]: https://github.com/rust-lang/rust/pull/51899/
4239 [51912]: https://github.com/rust-lang/rust/pull/51912/
4240 [51619]: https://github.com/rust-lang/rust/pull/51619/
4241 [51656]: https://github.com/rust-lang/rust/pull/51656/
4242 [51178]: https://github.com/rust-lang/rust/pull/51178/
4243 [51122]: https://github.com/rust-lang/rust/pull/51122
4244 [50494]: https://github.com/rust-lang/rust/pull/50494/
4245 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4246 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4247 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4248 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4249 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4250 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4251 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4254 Version 1.28.0 (2018-08-02)
4255 ===========================
4259 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4260 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4261 the inner type across Foreign Function Interface (FFI) boundaries.
4262 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4263 and can now be used as identifiers.][51196]
4264 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4265 stable.][51241] This will allow users to specify a global allocator for
4267 - [Unit test functions marked with the `#[test]` attribute can now return
4268 `Result<(), E: Debug>` in addition to `()`.][51298]
4269 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4270 allows macros to easily target lifetimes.
4274 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4275 prioritise making smaller binary sizes. `z` is the same as `s` with the
4276 exception that it does not vectorise loops, which typically results in an even
4278 - [The short error format is now stable.][49546] Specified with
4279 `--error-format=short` this option will provide a more compressed output of
4280 rust error messages.
4281 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4282 - [Reduced the number of allocations in the macro parser.][50855] This can
4283 improve compile times of macro heavy crates on average by 5%.
4287 - [Implemented `Default` for `&mut str`.][51306]
4288 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4289 - [Implemented `Extend` for `()`.][50234]
4290 - [The `Debug` implementation of `time::Duration` should now be more easily
4291 human readable.][50364] Previously a `Duration` of one second would printed as
4292 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4293 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4294 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4295 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4296 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4297 for `PathBuf`.][50170]
4298 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4299 and `Wrapping<i128>`.][50465]
4300 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4301 possible.][51050] This can provide up to a 40% speed increase.
4302 - [Improved error messages when using `format!`.][50610]
4306 - [`Iterator::step_by`]
4307 - [`Path::ancestors`]
4308 - [`SystemTime::UNIX_EPOCH`]
4309 - [`alloc::GlobalAlloc`]
4311 - [`alloc::LayoutErr`]
4314 - [`alloc::alloc_zeroed`]
4315 - [`alloc::dealloc`]
4316 - [`alloc::realloc`]
4317 - [`alloc::handle_alloc_error`]
4318 - [`btree_map::Entry::or_default`]
4319 - [`fmt::Alignment`]
4320 - [`hash_map::Entry::or_default`]
4321 - [`iter::repeat_with`]
4322 - [`num::NonZeroUsize`]
4323 - [`num::NonZeroU128`]
4324 - [`num::NonZeroU16`]
4325 - [`num::NonZeroU32`]
4326 - [`num::NonZeroU64`]
4327 - [`num::NonZeroU8`]
4328 - [`ops::RangeBounds`]
4329 - [`slice::SliceIndex`]
4330 - [`slice::from_mut`]
4331 - [`slice::from_ref`]
4332 - [`{Any + Send + Sync}::downcast_mut`]
4333 - [`{Any + Send + Sync}::downcast_ref`]
4334 - [`{Any + Send + Sync}::is`]
4338 - [Cargo will now no longer allow you to publish crates with build scripts that
4339 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4340 considered to be immutable.
4344 - [The `suggestion_applicability` field in `rustc`'s json output is now
4345 stable.][50486] This will allow dev tools to check whether a code suggestion
4346 would apply to them.
4350 - [Rust will consider trait objects with duplicated constraints to be the same
4351 type as without the duplicated constraint.][51276] For example the below code will
4352 now fail to compile.
4357 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4360 impl Trait + Send + Send {
4361 fn test(&self) { println!("two"); }
4365 [49546]: https://github.com/rust-lang/rust/pull/49546/
4366 [50143]: https://github.com/rust-lang/rust/pull/50143/
4367 [50170]: https://github.com/rust-lang/rust/pull/50170/
4368 [50234]: https://github.com/rust-lang/rust/pull/50234/
4369 [50265]: https://github.com/rust-lang/rust/pull/50265/
4370 [50364]: https://github.com/rust-lang/rust/pull/50364/
4371 [50385]: https://github.com/rust-lang/rust/pull/50385/
4372 [50465]: https://github.com/rust-lang/rust/pull/50465/
4373 [50486]: https://github.com/rust-lang/rust/pull/50486/
4374 [50554]: https://github.com/rust-lang/rust/pull/50554/
4375 [50610]: https://github.com/rust-lang/rust/pull/50610/
4376 [50855]: https://github.com/rust-lang/rust/pull/50855/
4377 [51050]: https://github.com/rust-lang/rust/pull/51050/
4378 [51196]: https://github.com/rust-lang/rust/pull/51196/
4379 [51241]: https://github.com/rust-lang/rust/pull/51241/
4380 [51276]: https://github.com/rust-lang/rust/pull/51276/
4381 [51298]: https://github.com/rust-lang/rust/pull/51298/
4382 [51306]: https://github.com/rust-lang/rust/pull/51306/
4383 [51562]: https://github.com/rust-lang/rust/pull/51562/
4384 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4385 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4386 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4387 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4388 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4389 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4390 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4391 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4392 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4393 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4394 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4395 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4396 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4397 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4398 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4399 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4400 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4401 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4402 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4403 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4404 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4405 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4406 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4407 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4408 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4409 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4410 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4411 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4412 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4413 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4415 Version 1.27.2 (2018-07-20)
4416 ===========================
4421 - The borrow checker was fixed to avoid potential unsoundness when using
4422 match ergonomics: [#52213][52213].
4424 [52213]: https://github.com/rust-lang/rust/issues/52213
4426 Version 1.27.1 (2018-07-10)
4427 ===========================
4432 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4433 when running, which enabled executing code as some other user on a
4434 given machine. This release fixes that vulnerability; you can read
4435 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4437 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4442 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4443 match ergonomics: [#51415][51415], [#49534][49534].
4445 [51415]: https://github.com/rust-lang/rust/issues/51415
4446 [49534]: https://github.com/rust-lang/rust/issues/49534
4447 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4448 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4450 Version 1.27.0 (2018-06-21)
4451 ==========================
4455 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4456 be used as an identifier.
4457 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4458 bare `Trait` syntax, and should make it clearer when being used in tandem with
4459 `impl Trait` because it is equivalent to the following syntax:
4460 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4461 `Box<Trait> == Box<dyn Trait>`.
4462 - [Attributes on generic parameters such as types and lifetimes are
4463 now stable.][48851] e.g.
4464 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4465 - [The `#[must_use]` attribute can now also be used on functions as well as
4466 types.][48925] It provides a lint that by default warns users when the
4467 value returned by a function has not been used.
4471 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4475 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4476 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4477 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4478 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4479 the `cfg` attribute.
4480 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4481 std are now available in core.][49896]
4482 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4484 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4485 that the operation isn't done in place.
4486 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4487 the `#[must_use]` attribute][49533] to warn about unused potentially
4488 expensive allocations.
4492 - [`DoubleEndedIterator::rfind`]
4493 - [`DoubleEndedIterator::rfold`]
4494 - [`DoubleEndedIterator::try_rfold`]
4495 - [`Duration::from_micros`]
4496 - [`Duration::from_nanos`]
4497 - [`Duration::subsec_micros`]
4498 - [`Duration::subsec_millis`]
4499 - [`HashMap::remove_entry`]
4500 - [`Iterator::try_fold`]
4501 - [`Iterator::try_for_each`]
4503 - [`Option::filter`]
4504 - [`String::replace_range`]
4505 - [`Take::set_limit`]
4506 - [`hint::unreachable_unchecked`]
4507 - [`os::unix::process::parent_id`]
4508 - [`ptr::swap_nonoverlapping`]
4509 - [`slice::rsplit_mut`]
4511 - [`slice::swap_with_slice`]
4515 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4516 `readme`, and `repository` fields.][cargo/5386]
4517 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4518 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4519 a different directory than `target` for placing compilation artifacts.
4520 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4521 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4522 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4523 where cargo would infer a binary, Cargo will produce a warning. You can
4524 disable this feature ahead of time by setting any of the following to false:
4525 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4526 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4527 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4531 - [Added “The Rustc book” into the official documentation.][49707]
4532 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4533 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4537 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4538 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4539 compile, `"".is_empty()` will still compile.
4540 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4541 will only print the inner type.][48553] E.g.
4542 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4543 not `AtomicBool(true)`.
4544 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4545 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4546 alignment should cover all use cases.
4547 - The `.description()` method on the `std::error::Error` trait
4548 [has been soft-deprecated][50163]. It is no longer required to implement it.
4550 [48553]: https://github.com/rust-lang/rust/pull/48553/
4551 [48851]: https://github.com/rust-lang/rust/pull/48851/
4552 [48925]: https://github.com/rust-lang/rust/pull/48925/
4553 [49533]: https://github.com/rust-lang/rust/pull/49533/
4554 [49623]: https://github.com/rust-lang/rust/pull/49623/
4555 [49630]: https://github.com/rust-lang/rust/pull/49630/
4556 [49664]: https://github.com/rust-lang/rust/pull/49664/
4557 [49699]: https://github.com/rust-lang/rust/pull/49699/
4558 [49707]: https://github.com/rust-lang/rust/pull/49707/
4559 [49896]: https://github.com/rust-lang/rust/pull/49896/
4560 [49968]: https://github.com/rust-lang/rust/pull/49968/
4561 [50163]: https://github.com/rust-lang/rust/pull/50163
4562 [50177]: https://github.com/rust-lang/rust/pull/50177/
4563 [50378]: https://github.com/rust-lang/rust/pull/50378/
4564 [50423]: https://github.com/rust-lang/rust/pull/50423/
4565 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4566 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4567 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4568 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4569 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4570 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4571 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4572 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4573 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4574 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4575 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4576 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4577 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4578 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4579 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4580 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4581 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4582 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4583 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4584 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4585 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4586 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4587 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4588 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4589 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4590 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4591 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4592 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4593 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4596 Version 1.26.2 (2018-06-05)
4597 ==========================
4602 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4604 [51117]: https://github.com/rust-lang/rust/issues/51117
4607 Version 1.26.1 (2018-05-29)
4608 ==========================
4613 - [RLS now works on Windows.][50646]
4614 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4620 - [`fn main() -> impl Trait` no longer works for non-Termination
4622 This reverts an accidental stabilization.
4623 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4624 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4626 [50646]: https://github.com/rust-lang/rust/issues/50646
4627 [50656]: https://github.com/rust-lang/rust/pull/50656
4628 [50812]: https://github.com/rust-lang/rust/pull/50812
4629 [50950]: https://github.com/rust-lang/rust/issues/50950
4630 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4632 Version 1.26.0 (2018-05-10)
4633 ==========================
4637 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4638 implement either or both traits.][49299]
4639 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4640 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4641 lifetime can be elided.][49458]
4642 - [`impl Trait` is now stable allowing you to have abstract types in returns
4643 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4644 `fn open(path: impl AsRef<Path>)`.
4645 - [Pattern matching will now automatically apply dereferences.][49394]
4646 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4647 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4648 - [A lot of operations are now available in a const context.][46882] E.g. You
4649 can now index into constant arrays, reference and dereference into constants,
4650 and use tuple struct constructors.
4651 - [Fixed entry slice patterns are now stable.][48516] E.g.
4653 let points = [1, 2, 3, 4];
4655 [1, 2, 3, 4] => println!("All points were sequential."),
4656 _ => println!("Not all points were sequential."),
4663 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4664 - [Fixed exponential projection complexity on nested types.][48296]
4665 This can provide up to a ~12% reduction in compile times for certain crates.
4666 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4667 to remap path prefixes outputted by the compiler.
4668 - [Added `powerpc-unknown-netbsd` target.][48281]
4672 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4673 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4674 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4675 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4676 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4677 - [`ascii::escape_default` is now available in libcore.][48735]
4678 - [Trailing commas are now supported in std and core macros.][48056]
4679 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4680 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4685 - [`*const T::copy_to_nonoverlapping`]
4686 - [`*const T::copy_to`]
4687 - [`*const T::read_unaligned`]
4688 - [`*const T::read_volatile`]
4689 - [`*const T::read`]
4691 - [`*const T::wrapping_add`]
4692 - [`*const T::wrapping_sub`]
4694 - [`*mut T::copy_to_nonoverlapping`]
4695 - [`*mut T::copy_to`]
4696 - [`*mut T::read_unaligned`]
4697 - [`*mut T::read_volatile`]
4699 - [`*mut T::replace`]
4702 - [`*mut T::wrapping_add`]
4703 - [`*mut T::wrapping_sub`]
4704 - [`*mut T::write_bytes`]
4705 - [`*mut T::write_unaligned`]
4706 - [`*mut T::write_volatile`]
4709 - [`FromUtf8Error::as_bytes`]
4710 - [`LocalKey::try_with`]
4711 - [`Option::cloned`]
4712 - [`btree_map::Entry::and_modify`]
4713 - [`fs::read_to_string`]
4716 - [`hash_map::Entry::and_modify`]
4717 - [`iter::FusedIterator`]
4718 - [`ops::RangeInclusive`]
4719 - [`ops::RangeToInclusive`]
4721 - [`slice::rotate_left`]
4722 - [`slice::rotate_right`]
4723 - [`String::retain`]
4728 - [Cargo will now output path to custom commands when `-v` is
4729 passed with `--list`][cargo/5041]
4730 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4734 - [The second edition of "The Rust Programming Language" book is now recommended
4735 over the first.][48404]
4740 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4741 syntax is now invalid.
4743 use std::ops::Fn as dyn;
4744 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4746 - [The result of dereferences are no longer promoted to `'static`.][47408]
4750 const PAIR: &(i32, i32) = &(0, 1);
4751 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4754 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4755 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4757 - [Removed hoedown from rustdoc.][48274]
4758 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4760 [46882]: https://github.com/rust-lang/rust/pull/46882
4761 [47379]: https://github.com/rust-lang/rust/pull/47379
4762 [47408]: https://github.com/rust-lang/rust/pull/47408
4763 [47813]: https://github.com/rust-lang/rust/pull/47813
4764 [48056]: https://github.com/rust-lang/rust/pull/48056
4765 [48125]: https://github.com/rust-lang/rust/pull/48125
4766 [48235]: https://github.com/rust-lang/rust/pull/48235
4767 [48274]: https://github.com/rust-lang/rust/pull/48274
4768 [48281]: https://github.com/rust-lang/rust/pull/48281
4769 [48296]: https://github.com/rust-lang/rust/pull/48296
4770 [48326]: https://github.com/rust-lang/rust/pull/48326
4771 [48359]: https://github.com/rust-lang/rust/pull/48359
4772 [48404]: https://github.com/rust-lang/rust/pull/48404
4773 [48481]: https://github.com/rust-lang/rust/pull/48481
4774 [48516]: https://github.com/rust-lang/rust/pull/48516
4775 [48628]: https://github.com/rust-lang/rust/pull/48628
4776 [48629]: https://github.com/rust-lang/rust/pull/48629
4777 [48657]: https://github.com/rust-lang/rust/pull/48657
4778 [48735]: https://github.com/rust-lang/rust/pull/48735
4779 [48978]: https://github.com/rust-lang/rust/pull/48978
4780 [49101]: https://github.com/rust-lang/rust/pull/49101
4781 [49109]: https://github.com/rust-lang/rust/pull/49109
4782 [49162]: https://github.com/rust-lang/rust/pull/49162
4783 [49255]: https://github.com/rust-lang/rust/pull/49255
4784 [49299]: https://github.com/rust-lang/rust/pull/49299
4785 [49305]: https://github.com/rust-lang/rust/pull/49305
4786 [49394]: https://github.com/rust-lang/rust/pull/49394
4787 [49458]: https://github.com/rust-lang/rust/pull/49458
4788 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4789 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4790 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4791 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4792 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4793 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4794 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4795 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4796 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4797 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4798 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4799 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4800 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4801 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4802 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4803 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4804 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4805 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4806 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4807 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4808 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4809 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4810 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4811 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4812 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4813 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4814 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4815 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4816 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4817 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4818 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4819 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4820 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4821 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4822 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4823 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4824 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4825 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4826 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4827 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4828 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4829 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4832 Version 1.25.0 (2018-03-29)
4833 ==========================
4837 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4838 - [You can now use nested groups of imports.][47948]
4839 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4840 - [You can now have `|` at the start of a match arm.][47947] e.g.
4842 enum Foo { A, B, C }
4848 | Foo::B => println!("AB"),
4849 | Foo::C => println!("C"),
4856 - [Upgraded to LLVM 6.][47828]
4857 - [Added `-C lto=val` option.][47521]
4858 - [Added `i586-unknown-linux-musl` target][47282]
4862 - [Impl Send for `process::Command` on Unix.][47760]
4863 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4864 - [`UnsafeCell::into_inner` is now safe.][47204]
4865 - [Implement libstd for CloudABI.][47268]
4866 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4867 - [Implement `AsRef<Path>` for Component][46985]
4868 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4869 - [Moved `Duration` to libcore.][46666]
4873 - [`Location::column`]
4876 The following functions can now be used in a constant expression.
4877 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4878 - [`Duration::new`][47300]
4879 - [`Duration::from_secs`][47300]
4880 - [`Duration::from_millis`][47300]
4884 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4885 - [`cargo new` now defaults to creating a binary crate, instead of a
4886 library crate.][cargo/5029]
4890 - [Rust by example is now shipped with new releases][46196]
4894 - [Deprecated `net::lookup_host`.][47510]
4895 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4896 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4897 around indexing operations (see [#47349][47349]). This has been fixed (which also
4898 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4899 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4901 [33903]: https://github.com/rust-lang/rust/pull/33903
4902 [47947]: https://github.com/rust-lang/rust/pull/47947
4903 [47948]: https://github.com/rust-lang/rust/pull/47948
4904 [47760]: https://github.com/rust-lang/rust/pull/47760
4905 [47790]: https://github.com/rust-lang/rust/pull/47790
4906 [47828]: https://github.com/rust-lang/rust/pull/47828
4907 [47398]: https://github.com/rust-lang/rust/pull/47398
4908 [47510]: https://github.com/rust-lang/rust/pull/47510
4909 [47521]: https://github.com/rust-lang/rust/pull/47521
4910 [47204]: https://github.com/rust-lang/rust/pull/47204
4911 [47251]: https://github.com/rust-lang/rust/pull/47251
4912 [47268]: https://github.com/rust-lang/rust/pull/47268
4913 [47282]: https://github.com/rust-lang/rust/pull/47282
4914 [47300]: https://github.com/rust-lang/rust/pull/47300
4915 [47349]: https://github.com/rust-lang/rust/pull/47349
4916 [46931]: https://github.com/rust-lang/rust/pull/46931
4917 [46985]: https://github.com/rust-lang/rust/pull/46985
4918 [47006]: https://github.com/rust-lang/rust/pull/47006
4919 [46830]: https://github.com/rust-lang/rust/pull/46830
4920 [46095]: https://github.com/rust-lang/rust/pull/46095
4921 [46666]: https://github.com/rust-lang/rust/pull/46666
4922 [46196]: https://github.com/rust-lang/rust/pull/46196
4923 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4924 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4925 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4926 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4927 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4930 Version 1.24.1 (2018-03-01)
4931 ==========================
4933 - [Do not abort when unwinding through FFI][48251]
4934 - [Emit UTF-16 files for linker arguments on Windows][48318]
4935 - [Make the error index generator work again][48308]
4936 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4938 [48251]: https://github.com/rust-lang/rust/issues/48251
4939 [48308]: https://github.com/rust-lang/rust/issues/48308
4940 [48318]: https://github.com/rust-lang/rust/issues/48318
4941 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4944 Version 1.24.0 (2018-02-15)
4945 ==========================
4949 - [External `sysv64` ffi is now available.][46528]
4950 eg. `extern "sysv64" fn foo () {}`
4954 - [rustc now uses 16 codegen units by default for release builds.][46910]
4955 For the fastest builds, utilize `codegen-units=1`.
4956 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4957 - [Add `aarch64-unknown-openbsd` support][46760]
4961 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4962 improvement in performance in the majority of cases.
4963 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4964 with Windows.][46798]
4965 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4966 - [impl `From<bool>` for `AtomicBool`][46293]
4967 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4968 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4969 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4970 - [float::from_bits now just uses transmute.][46012] This provides
4971 some optimisations from LLVM.
4972 - [Copied `AsciiExt` methods onto `char`][46077]
4973 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4974 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4975 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4976 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4980 - [`RefCell::replace`]
4982 - [`atomic::spin_loop_hint`]
4984 The following functions can now be used in a constant expression.
4985 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4987 - [`AtomicBool::new`][46287]
4988 - [`AtomicUsize::new`][46287]
4989 - [`AtomicIsize::new`][46287]
4990 - [`AtomicPtr::new`][46287]
4991 - [`Cell::new`][46287]
4992 - [`{integer}::min_value`][46287]
4993 - [`{integer}::max_value`][46287]
4994 - [`mem::size_of`][46287]
4995 - [`mem::align_of`][46287]
4996 - [`ptr::null`][46287]
4997 - [`ptr::null_mut`][46287]
4998 - [`RefCell::new`][46287]
4999 - [`UnsafeCell::new`][46287]
5003 - [Added a `workspace.default-members` config that
5004 overrides implied `--all` in virtual workspaces.][cargo/4743]
5005 - [Enable incremental by default on development builds.][cargo/4817] Also added
5006 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5007 per-project or global basis respectively.
5014 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5015 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5016 in accordance with IETF RFC 4291 §2.2.
5017 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5018 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5019 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5020 - [Leading zeros in tuple struct members is now an error][47084]
5021 - [`column!()` macro is one-based instead of zero-based][46977]
5022 - [`fmt::Arguments` can no longer be shared across threads][45198]
5023 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5024 - [Cargo sets a different working directory for the compiler][cargo/4788]
5026 [44884]: https://github.com/rust-lang/rust/pull/44884
5027 [45198]: https://github.com/rust-lang/rust/pull/45198
5028 [45506]: https://github.com/rust-lang/rust/pull/45506
5029 [45990]: https://github.com/rust-lang/rust/pull/45990
5030 [46012]: https://github.com/rust-lang/rust/pull/46012
5031 [46077]: https://github.com/rust-lang/rust/pull/46077
5032 [46094]: https://github.com/rust-lang/rust/pull/46094
5033 [46284]: https://github.com/rust-lang/rust/pull/46284
5034 [46287]: https://github.com/rust-lang/rust/pull/46287
5035 [46293]: https://github.com/rust-lang/rust/pull/46293
5036 [46528]: https://github.com/rust-lang/rust/pull/46528
5037 [46671]: https://github.com/rust-lang/rust/pull/46671
5038 [46713]: https://github.com/rust-lang/rust/pull/46713
5039 [46735]: https://github.com/rust-lang/rust/pull/46735
5040 [46760]: https://github.com/rust-lang/rust/pull/46760
5041 [46798]: https://github.com/rust-lang/rust/pull/46798
5042 [46828]: https://github.com/rust-lang/rust/pull/46828
5043 [46831]: https://github.com/rust-lang/rust/pull/46831
5044 [46833]: https://github.com/rust-lang/rust/pull/46833
5045 [46910]: https://github.com/rust-lang/rust/pull/46910
5046 [46977]: https://github.com/rust-lang/rust/pull/46977
5047 [47018]: https://github.com/rust-lang/rust/pull/47018
5048 [47080]: https://github.com/rust-lang/rust/pull/47080
5049 [47084]: https://github.com/rust-lang/rust/pull/47084
5050 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5051 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5052 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5053 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5054 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5055 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5058 Version 1.23.0 (2018-01-04)
5059 ==========================
5063 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5064 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5065 Which should fix some confusing errors in some operations.
5069 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5070 undefined behavior.][45920]
5071 - [rustc now suggests renaming import if names clash.][45660]
5072 - [Display errors/warnings correctly when there are zero-width or
5073 wide characters.][45711]
5074 - [rustc now avoids unnecessary copies of arguments that are
5075 simple bindings][45380] This should improve memory usage on average by 5-10%.
5076 - [Updated musl used to build musl rustc to 1.1.17][45393]
5080 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5081 - [Implement Hash for raw pointers to unsized types][45483]
5082 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5083 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5084 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5085 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5086 and `<*mut T>::as_mut`][44932]
5087 - [Optimized `Thread::{park, unpark}` implementation][45524]
5088 - [Improved `SliceExt::binary_search` performance.][45333]
5089 - [impl `FromIterator<()>` for `()`][45379]
5090 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5098 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5099 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5100 - [Added unit test checking to `cargo check`][cargo/4592]
5101 - [Cargo now lets you install a specific version
5102 using `cargo install --version`][cargo/4637]
5106 - [Releases now ship with the Cargo book documentation.][45692]
5107 - [rustdoc now prints rendering warnings on every run.][45324]
5111 - [Changes have been made to type equality to make it more correct,
5112 in rare cases this could break some code.][45853] [Tracking issue for
5113 further information][45852]
5114 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5115 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5116 Android 9, the minimum supported version is Android 14.
5117 - [Bumped the minimum LLVM to 3.9][45326]
5119 [44042]: https://github.com/rust-lang/rust/pull/44042
5120 [44932]: https://github.com/rust-lang/rust/pull/44932
5121 [45267]: https://github.com/rust-lang/rust/pull/45267
5122 [45324]: https://github.com/rust-lang/rust/pull/45324
5123 [45326]: https://github.com/rust-lang/rust/pull/45326
5124 [45333]: https://github.com/rust-lang/rust/pull/45333
5125 [45379]: https://github.com/rust-lang/rust/pull/45379
5126 [45380]: https://github.com/rust-lang/rust/pull/45380
5127 [45393]: https://github.com/rust-lang/rust/pull/45393
5128 [45435]: https://github.com/rust-lang/rust/pull/45435
5129 [45483]: https://github.com/rust-lang/rust/pull/45483
5130 [45524]: https://github.com/rust-lang/rust/pull/45524
5131 [45571]: https://github.com/rust-lang/rust/pull/45571
5132 [45580]: https://github.com/rust-lang/rust/pull/45580
5133 [45610]: https://github.com/rust-lang/rust/pull/45610
5134 [45660]: https://github.com/rust-lang/rust/pull/45660
5135 [45692]: https://github.com/rust-lang/rust/pull/45692
5136 [45711]: https://github.com/rust-lang/rust/pull/45711
5137 [45772]: https://github.com/rust-lang/rust/pull/45772
5138 [45852]: https://github.com/rust-lang/rust/issues/45852
5139 [45853]: https://github.com/rust-lang/rust/pull/45853
5140 [45887]: https://github.com/rust-lang/rust/pull/45887
5141 [45920]: https://github.com/rust-lang/rust/pull/45920
5142 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5143 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5144 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5147 Version 1.22.1 (2017-11-22)
5148 ==========================
5150 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5152 [46183]: https://github.com/rust-lang/rust/pull/46183
5154 Version 1.22.0 (2017-11-22)
5155 ==========================
5159 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5160 - [Now accepts underscores in unicode escapes][43716]
5161 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5162 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5166 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5167 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5168 This should decrease compile times for debug builds.
5169 - [strict memory alignment now enabled on ARMv6][45094]
5170 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5174 - [Allow atomic operations up to 32 bits
5175 on `armv5te_unknown_linux_gnueabi`][44978]
5176 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5177 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5178 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5179 - [Properly detect overflow in `Instant += Duration`.][44220]
5180 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5181 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5182 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5189 - [Cargo will now build multi file examples in subdirectories of the `examples`
5190 folder that have a `main.rs` file.][cargo/4496]
5191 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5192 the old format will continue to work and can be updated with `cargo update`.
5193 - [Now supports vendoring git repositories][cargo/3992]
5197 - [`libbacktrace` is now available on Apple platforms.][44251]
5198 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5199 This now lets you specify that a given code example will fail to compile.
5203 - [The minimum Android version that rustc can build for has been bumped
5204 to `4.0` from `2.3`][45656]
5205 - [Allowing `T op= &T` for numeric types has broken some type
5206 inference cases][45480]
5209 [42526]: https://github.com/rust-lang/rust/pull/42526
5210 [43716]: https://github.com/rust-lang/rust/pull/43716
5211 [43949]: https://github.com/rust-lang/rust/pull/43949
5212 [44015]: https://github.com/rust-lang/rust/pull/44015
5213 [44220]: https://github.com/rust-lang/rust/pull/44220
5214 [44251]: https://github.com/rust-lang/rust/pull/44251
5215 [44287]: https://github.com/rust-lang/rust/pull/44287
5216 [44303]: https://github.com/rust-lang/rust/pull/44303
5217 [44456]: https://github.com/rust-lang/rust/pull/44456
5218 [44466]: https://github.com/rust-lang/rust/pull/44466
5219 [44895]: https://github.com/rust-lang/rust/pull/44895
5220 [44966]: https://github.com/rust-lang/rust/pull/44966
5221 [44978]: https://github.com/rust-lang/rust/pull/44978
5222 [45041]: https://github.com/rust-lang/rust/pull/45041
5223 [45064]: https://github.com/rust-lang/rust/pull/45064
5224 [45075]: https://github.com/rust-lang/rust/pull/45075
5225 [45094]: https://github.com/rust-lang/rust/pull/45094
5226 [45095]: https://github.com/rust-lang/rust/pull/45095
5227 [45480]: https://github.com/rust-lang/rust/issues/45480
5228 [45656]: https://github.com/rust-lang/rust/pull/45656
5229 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5230 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5231 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5238 Version 1.21.0 (2017-10-12)
5239 ==========================
5243 - [You can now use static references for literals.][43838]
5247 let x: &'static u32 = &0;
5250 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5253 my_macro!(Vec<i32>::new); // Always worked
5254 my_macro!(Vec::<i32>::new); // Now works
5259 - [Upgraded jemalloc to 4.5.0][43911]
5260 - [Enabled unwinding panics on Redox][43917]
5261 - [Now runs LLVM in parallel during translation phase.][43506]
5262 This should reduce peak memory usage.
5266 - [Generate builtin impls for `Clone` for all arrays and tuples that
5267 are `T: Clone`][43690]
5268 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5269 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5270 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5275 [`std::mem::discriminant`]
5279 - [You can now call `cargo install` with multiple package names][cargo/4216]
5280 - [Cargo commands inside a virtual workspace will now implicitly
5281 pass `--all`][cargo/4335]
5282 - [Added a `[patch]` section to `Cargo.toml` to handle
5283 prepublication dependencies][cargo/4123] [RFC 1969]
5284 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5285 like patterns][cargo/4270]
5286 - [Added the `--all-targets` option][cargo/4400]
5287 - [Using required dependencies as a feature is now deprecated and emits
5288 a warning][cargo/4364]
5293 - [Cargo docs are moving][43916]
5294 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5295 - [The rustdoc book is now available][43863]
5296 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5297 - [Added a preview of RLS has been made available through rustup][44204]
5298 Install with `rustup component add rls-preview`
5299 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5300 Previously only showed `std::os::unix`.
5304 - [Changes in method matching against higher-ranked types][43880] This may cause
5305 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5306 - [rustc's JSON error output's byte position start at top of file.][42973]
5307 Was previously relative to the rustc's internal `CodeMap` struct which
5308 required the unstable library `libsyntax` to correctly use.
5309 - [`unused_results` lint no longer ignores booleans][43728]
5311 [42565]: https://github.com/rust-lang/rust/pull/42565
5312 [42973]: https://github.com/rust-lang/rust/pull/42973
5313 [43348]: https://github.com/rust-lang/rust/pull/43348
5314 [43459]: https://github.com/rust-lang/rust/pull/43459
5315 [43506]: https://github.com/rust-lang/rust/pull/43506
5316 [43540]: https://github.com/rust-lang/rust/pull/43540
5317 [43690]: https://github.com/rust-lang/rust/pull/43690
5318 [43728]: https://github.com/rust-lang/rust/pull/43728
5319 [43838]: https://github.com/rust-lang/rust/pull/43838
5320 [43863]: https://github.com/rust-lang/rust/pull/43863
5321 [43880]: https://github.com/rust-lang/rust/pull/43880
5322 [43911]: https://github.com/rust-lang/rust/pull/43911
5323 [43916]: https://github.com/rust-lang/rust/pull/43916
5324 [43917]: https://github.com/rust-lang/rust/pull/43917
5325 [44204]: https://github.com/rust-lang/rust/pull/44204
5326 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5327 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5328 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5329 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5330 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5331 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5332 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5333 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5334 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5336 Version 1.20.0 (2017-08-31)
5337 ===========================
5341 - [Associated constants are now stabilised.][42809]
5342 - [A lot of macro bugs are now fixed.][42913]
5347 - [Struct fields are now properly coerced to the expected field type.][42807]
5348 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5349 `wasm32-experimental-emscripten` target.
5350 - [Changed some of the error messages to be more helpful.][42033]
5351 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5353 - [rustc now reports the total number of errors on compilation failure][43015]
5354 previously this was only the number of errors in the pass that failed.
5355 - [Expansion in rustc has been sped up 29x.][42533]
5356 - [added `msp430-none-elf` target.][43099]
5357 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5359 - [Fixes backtraces on Redox][43228]
5360 - [rustc now identifies different versions of same crate when absolute paths of
5361 different types match in an error message.][42826]
5367 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5368 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5370 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5371 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5372 - [Impl `Clone` for `DefaultHasher`.][42799]
5373 - [Impl `Sync` for `SyncSender`.][42397]
5374 - [Impl `FromStr` for `char`][42271]
5375 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5377 - [allow messages in the `unimplemented!()` macro.][42155]
5378 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5379 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5380 - [Upgrade to Unicode 10.0.0][42999]
5381 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5382 - [Skip the main thread's manual stack guard on Linux][43072]
5383 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5384 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5386 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5391 - [`CStr::into_c_string`]
5392 - [`CString::as_c_str`]
5393 - [`CString::into_boxed_c_str`]
5394 - [`Chain::get_mut`]
5395 - [`Chain::get_ref`]
5396 - [`Chain::into_inner`]
5397 - [`Option::get_or_insert_with`]
5398 - [`Option::get_or_insert`]
5399 - [`OsStr::into_os_string`]
5400 - [`OsString::into_boxed_os_str`]
5403 - [`Utf8Error::error_len`]
5404 - [`char::EscapeDebug`]
5405 - [`char::escape_debug`]
5406 - [`compile_error!`]
5407 - [`f32::from_bits`]
5409 - [`f64::from_bits`]
5411 - [`mem::ManuallyDrop`]
5412 - [`slice::sort_unstable_by_key`]
5413 - [`slice::sort_unstable_by`]
5414 - [`slice::sort_unstable`]
5415 - [`str::from_boxed_utf8_unchecked`]
5416 - [`str::as_bytes_mut`]
5417 - [`str::as_bytes_mut`]
5418 - [`str::from_utf8_mut`]
5419 - [`str::from_utf8_unchecked_mut`]
5421 - [`str::get_unchecked_mut`]
5422 - [`str::get_unchecked`]
5424 - [`str::into_boxed_bytes`]
5429 - [Cargo API token location moved from `~/.cargo/config` to
5430 `~/.cargo/credentials`.][cargo/3978]
5431 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5432 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5433 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5434 - [You can now specify version of a binary when installed through
5435 `cargo install` using `--vers`.][cargo/4229]
5436 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5437 failure.][cargo/4248]
5438 - [Changed the convention around which file is the crate root.][cargo/4259]
5443 - [Functions with `'static` in their return types will now not be as usable as
5444 if they were using lifetime parameters instead.][42417]
5445 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5446 takes the sign of NaN into account where previously didn't.][42430]
5448 [42033]: https://github.com/rust-lang/rust/pull/42033
5449 [42155]: https://github.com/rust-lang/rust/pull/42155
5450 [42271]: https://github.com/rust-lang/rust/pull/42271
5451 [42397]: https://github.com/rust-lang/rust/pull/42397
5452 [42417]: https://github.com/rust-lang/rust/pull/42417
5453 [42430]: https://github.com/rust-lang/rust/pull/42430
5454 [42431]: https://github.com/rust-lang/rust/pull/42431
5455 [42533]: https://github.com/rust-lang/rust/pull/42533
5456 [42571]: https://github.com/rust-lang/rust/pull/42571
5457 [42613]: https://github.com/rust-lang/rust/pull/42613
5458 [42799]: https://github.com/rust-lang/rust/pull/42799
5459 [42807]: https://github.com/rust-lang/rust/pull/42807
5460 [42809]: https://github.com/rust-lang/rust/pull/42809
5461 [42822]: https://github.com/rust-lang/rust/pull/42822
5462 [42826]: https://github.com/rust-lang/rust/pull/42826
5463 [42854]: https://github.com/rust-lang/rust/pull/42854
5464 [42913]: https://github.com/rust-lang/rust/pull/42913
5465 [42999]: https://github.com/rust-lang/rust/pull/42999
5466 [43011]: https://github.com/rust-lang/rust/pull/43011
5467 [43015]: https://github.com/rust-lang/rust/pull/43015
5468 [43072]: https://github.com/rust-lang/rust/pull/43072
5469 [43077]: https://github.com/rust-lang/rust/pull/43077
5470 [43097]: https://github.com/rust-lang/rust/pull/43097
5471 [43099]: https://github.com/rust-lang/rust/pull/43099
5472 [43170]: https://github.com/rust-lang/rust/pull/43170
5473 [43178]: https://github.com/rust-lang/rust/pull/43178
5474 [43185]: https://github.com/rust-lang/rust/pull/43185
5475 [43228]: https://github.com/rust-lang/rust/pull/43228
5476 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5477 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5478 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5479 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5480 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5481 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5482 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5483 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5484 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5485 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5486 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5487 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5488 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5489 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5490 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5491 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5492 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5493 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5494 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5495 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5496 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5497 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5498 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5499 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5500 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5501 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5502 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5503 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5504 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5505 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5506 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5507 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5508 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5509 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5510 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5511 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5512 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5513 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5516 Version 1.19.0 (2017-07-20)
5517 ===========================
5522 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5523 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5524 - [Macro recursion limit increased to 1024 from 64.][41676]
5525 - [Added lint for detecting unused macros.][41907]
5526 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5527 For example: `let x = loop { break 7; };`
5528 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5529 contain `Copy` types and cannot have a `Drop` implementation.
5530 Example: `union Foo { bar: u8, baz: usize }`
5531 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5532 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5537 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5538 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5539 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5540 you should use `--target armv7-linux-androideabi`.
5541 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5542 - [Minor optimisation of string operations.][42037]
5543 - [Compiler error message is now `aborting due to previous error(s)` instead of
5544 `aborting due to N previous errors`][42150] This was previously inaccurate and
5545 would only count certain kinds of errors.
5546 - [The compiler now supports Visual Studio 2017][42225]
5547 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5548 - [Added a lot][42264] of [new error codes][42302]
5549 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5550 libraries with C Run-time Libraries(CRT) to be statically linked.
5551 - [Fixed various ARM codegen bugs][42740]
5556 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5557 `Extend<Cow<'a, str>>`][41449]
5558 - [`Vec` now implements `From<&mut [T]>`][41530]
5559 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5560 - [`SplitWhitespace` now implements `Clone`][41659]
5561 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5563 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5564 macros, but for printing to stderr.
5569 - [`OsString::shrink_to_fit`]
5572 - [`thread::ThreadId`]
5577 - [Build scripts can now add environment variables to the environment
5578 the crate is being compiled in.
5579 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5580 - [Subcommands now replace the current process rather than spawning a new
5581 child process][cargo/3970]
5582 - [Workspace members can now accept glob file patterns][cargo/3979]
5583 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5584 the members in a given workspace.][cargo/3988]
5585 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5586 - [Target directory path is now in the cargo metadata][cargo/4022]
5587 - [Cargo no longer checks out a local working directory for the
5588 crates.io index][cargo/4026] This should provide smaller file size for the
5589 registry, and improve cloning times, especially on Windows machines.
5590 - [Added an `--exclude` option for excluding certain packages when using the
5591 `--all` option][cargo/4031]
5592 - [Cargo will now automatically retry when receiving a 5xx error
5593 from crates.io][cargo/4032]
5594 - [The `--features` option now accepts multiple comma or space
5595 delimited values.][cargo/4084]
5596 - [Added support for custom target specific runners][cargo/3954]
5601 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5603 - [Rust will now release XZ compressed packages][rust-installer/57]
5604 - [rustup will now prefer to download rust packages with
5605 XZ compression][rustup/1100] over GZip packages.
5606 - [Added the ability to escape `#` in rust documentation][41785] By adding
5607 additional `#`'s ie. `##` is now `#`
5612 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5613 - [`-Z` flags are now no longer allowed to be used on the stable
5614 compiler.][41751] This has been a warning for a year previous to this.
5615 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5616 longer works][42844]. Users should migrate to the built-in `check`
5617 command, which has been available since 1.16.
5618 - [Ending a float literal with `._` is now a hard error.
5619 Example: `42._` .][41946]
5620 - [Any use of a private `extern crate` outside of its module is now a
5621 hard error.][36886] This was previously a warning.
5622 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5623 relative while the `::` prefix makes a path absolute, but was ignored and the
5624 path was relative regardless.
5625 - [Floating point constants in match patterns is now a hard error][36890]
5626 This was previously a warning.
5627 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5628 match patterns is now a hard error][36891] This was previously a warning.
5629 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5631 - [From the pound escape, lines consisting of multiple `#`s are
5633 - [It is an error to re-export private enum variants][42460]. This is
5634 known to break a number of crates that depend on an older version of
5636 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5637 to use it to find the linker, and the build will fail where it did
5638 not previously][42607]
5640 [36886]: https://github.com/rust-lang/rust/issues/36886
5641 [36888]: https://github.com/rust-lang/rust/issues/36888
5642 [36890]: https://github.com/rust-lang/rust/issues/36890
5643 [36891]: https://github.com/rust-lang/rust/issues/36891
5644 [36892]: https://github.com/rust-lang/rust/issues/36892
5645 [37406]: https://github.com/rust-lang/rust/issues/37406
5646 [39983]: https://github.com/rust-lang/rust/pull/39983
5647 [41145]: https://github.com/rust-lang/rust/pull/41145
5648 [41192]: https://github.com/rust-lang/rust/pull/41192
5649 [41258]: https://github.com/rust-lang/rust/pull/41258
5650 [41370]: https://github.com/rust-lang/rust/pull/41370
5651 [41449]: https://github.com/rust-lang/rust/pull/41449
5652 [41530]: https://github.com/rust-lang/rust/pull/41530
5653 [41624]: https://github.com/rust-lang/rust/pull/41624
5654 [41656]: https://github.com/rust-lang/rust/pull/41656
5655 [41659]: https://github.com/rust-lang/rust/pull/41659
5656 [41676]: https://github.com/rust-lang/rust/pull/41676
5657 [41751]: https://github.com/rust-lang/rust/pull/41751
5658 [41764]: https://github.com/rust-lang/rust/pull/41764
5659 [41785]: https://github.com/rust-lang/rust/pull/41785
5660 [41873]: https://github.com/rust-lang/rust/pull/41873
5661 [41907]: https://github.com/rust-lang/rust/pull/41907
5662 [41946]: https://github.com/rust-lang/rust/pull/41946
5663 [42016]: https://github.com/rust-lang/rust/pull/42016
5664 [42037]: https://github.com/rust-lang/rust/pull/42037
5665 [42068]: https://github.com/rust-lang/rust/pull/42068
5666 [42150]: https://github.com/rust-lang/rust/pull/42150
5667 [42162]: https://github.com/rust-lang/rust/pull/42162
5668 [42225]: https://github.com/rust-lang/rust/pull/42225
5669 [42264]: https://github.com/rust-lang/rust/pull/42264
5670 [42302]: https://github.com/rust-lang/rust/pull/42302
5671 [42460]: https://github.com/rust-lang/rust/issues/42460
5672 [42607]: https://github.com/rust-lang/rust/issues/42607
5673 [42740]: https://github.com/rust-lang/rust/pull/42740
5674 [42844]: https://github.com/rust-lang/rust/issues/42844
5675 [42948]: https://github.com/rust-lang/rust/pull/42948
5676 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5677 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5678 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5679 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5680 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5681 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5682 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5683 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5684 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5685 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5686 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5687 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5688 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5689 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5690 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5691 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5692 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5693 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5694 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5695 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5696 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5697 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5700 Version 1.18.0 (2017-06-08)
5701 ===========================
5706 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5707 make the item visible to just that module tree. Also accepts the keyword
5708 `crate` to make something public to the whole crate but not users of the
5709 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5710 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5711 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5712 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5713 types like `Write + Send`, trailing `+` are now supported in trait objects,
5714 and better error reporting for trait objects starting with `?Sized`.
5715 - [0e+10 is now a valid floating point literal][40589]
5716 - [Now warns if you bind a lifetime parameter to 'static][40734]
5717 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5718 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5719 representation in some cases.][40377]
5724 - [rustc can now emit mir with `--emit mir`][39891]
5725 - [Improved LLVM IR for trivial functions][40367]
5726 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5727 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5728 opportunities found through profiling
5729 - [Improved backtrace formatting when panicking][38165]
5734 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5735 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5736 iteration or reallocation.
5737 - [Simplified HashMap Bucket interface][40561] provides performance
5738 improvements for iterating and cloning.
5739 - [Specialize Vec::from_elem to use calloc][40409]
5740 - [Fixed Race condition in fs::create_dir_all][39799]
5741 - [No longer caching stdio on Windows][40516]
5742 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5743 2.50%~ faster and in one case now 12.50% faster.
5744 - [Optimized `AtomicBool::fetch_nand`][41143]
5749 - [`Child::try_wait`]
5750 - [`HashMap::retain`]
5751 - [`HashSet::retain`]
5753 - [`TcpStream::peek`]
5754 - [`UdpSocket::peek`]
5755 - [`UdpSocket::peek_from`]
5760 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5761 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5762 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5763 - [Added Android build support][cargo/3885]
5764 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5765 of a certain type, for example `cargo build --bins` will build all
5767 - [Added support for haiku][cargo/3952]
5772 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5773 - [Rust now uses the official cross compiler for NetBSD][40612]
5774 - [rustdoc now accepts `#` at the start of files][40828]
5775 - [Fixed jemalloc support for musl][41168]
5780 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5781 always placed after the sign if it exists and before the digits. With the `#`
5782 flag the zeroes are placed after the prefix and before the digits.
5783 - [Due to the struct field optimisation][40377], using `transmute` on structs
5784 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5785 always been undefined behavior, but is now more likely to break in practice.
5786 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5787 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5788 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5789 - [Overlapping inherent `impl`s are now a hard error][40728]
5790 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5791 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5792 `out.asm` and `out.ll` instead of only one of the filetypes.
5793 - [ calling a function that returns `Self` will no longer work][41805] when
5794 the size of `Self` cannot be statically determined.
5795 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5796 this has caused a few regressions namely:
5798 - Changed the link order of local static/dynamic libraries (respecting the
5799 order on given rather than having the compiler reorder).
5800 - Changed how MinGW is linked, native code linked to dynamic libraries
5801 may require manually linking to the gcc support library (for the native
5804 [38165]: https://github.com/rust-lang/rust/pull/38165
5805 [39799]: https://github.com/rust-lang/rust/pull/39799
5806 [39891]: https://github.com/rust-lang/rust/pull/39891
5807 [40043]: https://github.com/rust-lang/rust/pull/40043
5808 [40241]: https://github.com/rust-lang/rust/pull/40241
5809 [40338]: https://github.com/rust-lang/rust/pull/40338
5810 [40367]: https://github.com/rust-lang/rust/pull/40367
5811 [40377]: https://github.com/rust-lang/rust/pull/40377
5812 [40409]: https://github.com/rust-lang/rust/pull/40409
5813 [40516]: https://github.com/rust-lang/rust/pull/40516
5814 [40556]: https://github.com/rust-lang/rust/pull/40556
5815 [40561]: https://github.com/rust-lang/rust/pull/40561
5816 [40589]: https://github.com/rust-lang/rust/pull/40589
5817 [40612]: https://github.com/rust-lang/rust/pull/40612
5818 [40723]: https://github.com/rust-lang/rust/pull/40723
5819 [40728]: https://github.com/rust-lang/rust/pull/40728
5820 [40731]: https://github.com/rust-lang/rust/pull/40731
5821 [40734]: https://github.com/rust-lang/rust/pull/40734
5822 [40805]: https://github.com/rust-lang/rust/pull/40805
5823 [40807]: https://github.com/rust-lang/rust/pull/40807
5824 [40828]: https://github.com/rust-lang/rust/pull/40828
5825 [40870]: https://github.com/rust-lang/rust/pull/40870
5826 [41085]: https://github.com/rust-lang/rust/pull/41085
5827 [41143]: https://github.com/rust-lang/rust/pull/41143
5828 [41168]: https://github.com/rust-lang/rust/pull/41168
5829 [41270]: https://github.com/rust-lang/rust/issues/41270
5830 [41469]: https://github.com/rust-lang/rust/pull/41469
5831 [41805]: https://github.com/rust-lang/rust/issues/41805
5832 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5833 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5834 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5835 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5836 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5837 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5838 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5839 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5840 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5841 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5842 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5843 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5844 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5845 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5848 Version 1.17.0 (2017-04-27)
5849 ===========================
5854 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5855 * [Fields of structs may be initialized without duplicating the field/variable
5856 names][39761]. [RFC 1682]
5857 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5858 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5859 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5860 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5861 `'b`. Soundness fix.
5862 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5863 * [Static variables may contain references to other statics][40027]
5868 * [Exit quickly on only `--emit dep-info`][40336]
5869 * [Make `-C relocation-model` more correctly determine whether the linker
5870 creates a position-independent executable][40245]
5871 * [Add `-C overflow-checks` to directly control whether integer overflow
5873 * [The rustc type checker now checks items on demand instead of in a single
5874 in-order pass][40008]. This is mostly an internal refactoring in support of
5875 future work, including incremental type checking, but also resolves [RFC
5876 1647], allowing `Self` to appear in `impl` `where` clauses.
5877 * [Optimize vtable loads][39995]
5878 * [Turn off vectorization for Emscripten targets][39990]
5879 * [Provide suggestions for unknown macros imported with `use`][39953]
5880 * [Fix ICEs in path resolution][39939]
5881 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5882 * [Add clearer error message using `&str + &str`][39116]
5893 * [`Ordering::then`]
5894 * [`Ordering::then_with`]
5895 * [`BTreeMap::range`]
5896 * [`BTreeMap::range_mut`]
5897 * [`collections::Bound`]
5898 * [`process::abort`]
5899 * [`ptr::read_unaligned`]
5900 * [`ptr::write_unaligned`]
5901 * [`Result::expect_err`]
5904 * [`Cell::into_inner`]
5910 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5911 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5912 * [`String` implements `FromIterator<&char>`][40028]
5913 * `Box` [implements][40009] a number of new conversions:
5914 `From<Box<str>> for String`,
5915 `From<Box<[T]>> for Vec<T>`,
5916 `From<Box<CStr>> for CString`,
5917 `From<Box<OsStr>> for OsString`,
5918 `From<Box<Path>> for PathBuf`,
5919 `Into<Box<str>> for String`,
5920 `Into<Box<[T]>> for Vec<T>`,
5921 `Into<Box<CStr>> for CString`,
5922 `Into<Box<OsStr>> for OsString`,
5923 `Into<Box<Path>> for PathBuf`,
5924 `Default for Box<str>`,
5925 `Default for Box<CStr>`,
5926 `Default for Box<OsStr>`,
5927 `From<&CStr> for Box<CStr>`,
5928 `From<&OsStr> for Box<OsStr>`,
5929 `From<&Path> for Box<Path>`
5930 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5931 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5932 * [Slightly optimize `slice::sort`][39538]
5933 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5934 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5935 `Box<str>` implements `From<&str>`][39438]
5936 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5937 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5938 * [`format!` estimates the needed capacity before writing a string][39356]
5939 * [Support unprivileged symlink creation in Windows][38921]
5940 * [`PathBuf` implements `Default`][38764]
5941 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5942 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5943 and poor hash functions.
5948 * [Add `cargo check --all`][cargo/3731]
5949 * [Add an option to ignore SSL revocation checking][cargo/3699]
5950 * [Add `cargo run --package`][cargo/3691]
5951 * [Add `required_features`][cargo/3667]
5952 * [Assume `build.rs` is a build script][cargo/3664]
5953 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5958 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5960 * [The "Unstable Book" documents nightly-only features][ubook]
5961 * [Improve the style of the sidebar in rustdoc output][40265]
5962 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5963 * [Fix MSP430 breakage due to `i128`][40257]
5964 * [Preliminary Solaris/SPARCv9 support][39903]
5965 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5966 run without installing the MSVC runtime.
5967 * [`rustdoc --test` includes file names in test names][39788]
5968 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5969 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5970 * [Initial support for `aarch64-unknown-freebsd`][39491]
5971 * [Initial support for `i686-unknown-netbsd`][39426]
5972 * [This release no longer includes the old makefile build system][39431]. Rust
5973 is built with a custom build system, written in Rust, and with Cargo.
5974 * [Add Debug implementations for libcollection structs][39002]
5975 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5976 * [`--test-threads=0` produces an error][38945]
5977 * [`rustup` installs documentation by default][40526]
5978 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5979 WinDbg and Visual Studio to improve the debugging experience.
5984 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5985 workaround, either use MSVC 2015 or run vcvars.bat.
5986 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5987 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5988 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5990 * [`format!` and `Display::to_string` panic if an underlying formatting
5991 implementation returns an error][40117]. Previously the error was silently
5992 ignored. It is incorrect for `write_fmt` to return an error when writing
5994 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5995 crates were marked stable and could be accessed from the stable toolchain.
5996 * [Rust git source no longer includes vendored crates][39728]. Those that need
5997 to build with vendored crates should build from release tarballs.
5998 * [Fix inert attributes from `proc_macro_derives`][39572]
5999 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6000 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6002 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6003 existing code generally ignores the type of dead-code unless a type-hint is
6004 provided; this can cause surprising inference interactions particularly around
6005 defaulting. The new code uniformly ignores the result type of dead-code.
6006 * [Tuple-struct constructors with private fields are no longer visible][38932]
6007 * [Lifetime parameters that do not appear in the arguments are now considered
6008 early-bound][38897], resolving a soundness bug (#[32330]). The
6009 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6011 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6012 * [Make transmuting from fn item types to pointer-sized types a hard
6015 [27787]: https://github.com/rust-lang/rust/issues/27787
6016 [32330]: https://github.com/rust-lang/rust/issues/32330
6017 [34198]: https://github.com/rust-lang/rust/pull/34198
6018 [38161]: https://github.com/rust-lang/rust/pull/38161
6019 [38368]: https://github.com/rust-lang/rust/pull/38368
6020 [38584]: https://github.com/rust-lang/rust/issues/38584
6021 [38661]: https://github.com/rust-lang/rust/pull/38661
6022 [38764]: https://github.com/rust-lang/rust/pull/38764
6023 [38864]: https://github.com/rust-lang/rust/issues/38864
6024 [38897]: https://github.com/rust-lang/rust/pull/38897
6025 [38921]: https://github.com/rust-lang/rust/pull/38921
6026 [38932]: https://github.com/rust-lang/rust/pull/38932
6027 [38945]: https://github.com/rust-lang/rust/pull/38945
6028 [38981]: https://github.com/rust-lang/rust/pull/38981
6029 [39002]: https://github.com/rust-lang/rust/pull/39002
6030 [39116]: https://github.com/rust-lang/rust/pull/39116
6031 [39193]: https://github.com/rust-lang/rust/pull/39193
6032 [39265]: https://github.com/rust-lang/rust/pull/39265
6033 [39356]: https://github.com/rust-lang/rust/pull/39356
6034 [39372]: https://github.com/rust-lang/rust/pull/39372
6035 [39426]: https://github.com/rust-lang/rust/pull/39426
6036 [39431]: https://github.com/rust-lang/rust/pull/39431
6037 [39438]: https://github.com/rust-lang/rust/pull/39438
6038 [39440]: https://github.com/rust-lang/rust/pull/39440
6039 [39485]: https://github.com/rust-lang/rust/pull/39485
6040 [39491]: https://github.com/rust-lang/rust/pull/39491
6041 [39518]: https://github.com/rust-lang/rust/pull/39518
6042 [39538]: https://github.com/rust-lang/rust/pull/39538
6043 [39572]: https://github.com/rust-lang/rust/pull/39572
6044 [39633]: https://github.com/rust-lang/rust/pull/39633
6045 [39642]: https://github.com/rust-lang/rust/pull/39642
6046 [39728]: https://github.com/rust-lang/rust/pull/39728
6047 [39761]: https://github.com/rust-lang/rust/pull/39761
6048 [39788]: https://github.com/rust-lang/rust/pull/39788
6049 [39793]: https://github.com/rust-lang/rust/pull/39793
6050 [39837]: https://github.com/rust-lang/rust/pull/39837
6051 [39843]: https://github.com/rust-lang/rust/pull/39843
6052 [39851]: https://github.com/rust-lang/rust/pull/39851
6053 [39903]: https://github.com/rust-lang/rust/pull/39903
6054 [39939]: https://github.com/rust-lang/rust/pull/39939
6055 [39953]: https://github.com/rust-lang/rust/pull/39953
6056 [39960]: https://github.com/rust-lang/rust/pull/39960
6057 [39990]: https://github.com/rust-lang/rust/pull/39990
6058 [39995]: https://github.com/rust-lang/rust/pull/39995
6059 [40008]: https://github.com/rust-lang/rust/pull/40008
6060 [40009]: https://github.com/rust-lang/rust/pull/40009
6061 [40027]: https://github.com/rust-lang/rust/pull/40027
6062 [40028]: https://github.com/rust-lang/rust/pull/40028
6063 [40037]: https://github.com/rust-lang/rust/pull/40037
6064 [40117]: https://github.com/rust-lang/rust/pull/40117
6065 [40166]: https://github.com/rust-lang/rust/pull/40166
6066 [40245]: https://github.com/rust-lang/rust/pull/40245
6067 [40257]: https://github.com/rust-lang/rust/pull/40257
6068 [40261]: https://github.com/rust-lang/rust/pull/40261
6069 [40265]: https://github.com/rust-lang/rust/pull/40265
6070 [40319]: https://github.com/rust-lang/rust/pull/40319
6071 [40336]: https://github.com/rust-lang/rust/pull/40336
6072 [40526]: https://github.com/rust-lang/rust/pull/40526
6073 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6074 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6075 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6076 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6077 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6078 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6079 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6080 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6081 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6082 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6083 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6084 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6085 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6086 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6087 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6088 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6089 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6090 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6091 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6092 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6093 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6094 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6095 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6096 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6097 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6098 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6099 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6100 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6101 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6102 [ubook]: https://doc.rust-lang.org/unstable-book/
6105 Version 1.16.0 (2017-03-16)
6106 ===========================
6111 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6112 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6113 match patterns][38069]
6114 * [Clean up semantics of `self` in an import list][38313]
6115 * [`Self` may appear in `impl` headers][38920]
6116 * [`Self` may appear in struct expressions][39282]
6121 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6122 a `.rmeta` file containing only crate metadata][38571]. This can be
6123 used by tools like the Rust Language Service to perform
6124 metadata-only builds.
6125 * [Levenshtein based typo suggestions now work in most places, while
6126 previously they worked only for fields and sometimes for local
6127 variables][38927]. Together with the overhaul of "no
6128 resolution"/"unexpected resolution" errors (#[38154]) they result in
6129 large and systematic improvement in resolution diagnostics.
6130 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6132 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6133 * [`rustc` no longer attempts to provide "consider using an explicit
6134 lifetime" suggestions][37057]. They were inaccurate.
6139 * [`VecDeque::truncate`]
6140 * [`VecDeque::resize`]
6141 * [`String::insert_str`]
6142 * [`Duration::checked_add`]
6143 * [`Duration::checked_sub`]
6144 * [`Duration::checked_div`]
6145 * [`Duration::checked_mul`]
6148 * [`SocketAddr::is_ipv4`]
6149 * [`SocketAddr::is_ipv6`]
6150 * [`IpAddr::is_ipv4`]
6151 * [`IpAddr::is_ipv6`]
6153 * [`Vec::dedup_by_key`]
6154 * [`Result::unwrap_or_default`]
6155 * [`<*const T>::wrapping_offset`]
6156 * [`<*mut T>::wrapping_offset`]
6157 * `CommandExt::creation_flags`
6158 * [`File::set_permissions`]
6159 * [`String::split_off`]
6164 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6165 their argument by `Borrow` parameter][37761]
6166 * [All public types in std implement `Debug`][38006]
6167 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6168 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6169 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6171 * [std: Fix partial writes in `LineWriter`][38062]
6172 * [std: Clamp max read/write sizes on Unix][38622]
6173 * [Use more specific panic message for `&str` slicing errors][38066]
6174 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6175 functionality cannot be achieved in std currently.
6176 * [`writeln!`, like `println!`, now accepts a form with no string
6177 or formatting arguments, to just print a newline][38469]
6178 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6179 * [Reduce the size of static data in `std_unicode::tables`][38781]
6180 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6181 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6183 * [`Duration` implements `Sum`][38712]
6184 * [`String` implements `ToSocketAddrs`][39048]
6189 * [The `cargo check` command does a type check of a project without
6190 building it][cargo/3296]
6191 * [crates.io will display CI badges from Travis and AppVeyor, if
6192 specified in Cargo.toml][cargo/3546]
6193 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6194 * [Compilation profiles accept integer values for `debug`, in addition
6195 to `true` and `false`. These are passed to `rustc` as the value to
6196 `-C debuginfo`][cargo/3534]
6197 * [Implement `cargo --version --verbose`][cargo/3604]
6198 * [All builds now output 'dep-info' build dependencies compatible with
6199 make and ninja][cargo/3557]
6200 * [Build all workspace members with `build --all`][cargo/3511]
6201 * [Document all workspace members with `doc --all`][cargo/3515]
6202 * [Path deps outside workspace are not members][cargo/3443]
6207 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6208 the path to the Rust implementation][38589]
6209 * [The `armv7-linux-androideabi` target no longer enables NEON
6210 extensions, per Google's ABI guide][38413]
6211 * [The stock standard library can be compiled for Redox OS][38401]
6212 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6214 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6216 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6221 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6222 match patterns][38069]
6223 * In this release, references to uninhabited types can not be
6224 pattern-matched. This was accidentally allowed in 1.15.
6225 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6226 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6228 * [Clean up semantics of `self` in an import list][38313]
6229 * Reimplemented lifetime elision. This change was almost entirely compatible
6230 with existing code, but it did close a number of small bugs and loopholes,
6231 as well as being more accepting in some other [cases][41105].
6233 [37057]: https://github.com/rust-lang/rust/pull/37057
6234 [37761]: https://github.com/rust-lang/rust/pull/37761
6235 [38006]: https://github.com/rust-lang/rust/pull/38006
6236 [38051]: https://github.com/rust-lang/rust/pull/38051
6237 [38062]: https://github.com/rust-lang/rust/pull/38062
6238 [38622]: https://github.com/rust-lang/rust/pull/38622
6239 [38066]: https://github.com/rust-lang/rust/pull/38066
6240 [38069]: https://github.com/rust-lang/rust/pull/38069
6241 [38131]: https://github.com/rust-lang/rust/pull/38131
6242 [38154]: https://github.com/rust-lang/rust/pull/38154
6243 [38274]: https://github.com/rust-lang/rust/pull/38274
6244 [38304]: https://github.com/rust-lang/rust/pull/38304
6245 [38313]: https://github.com/rust-lang/rust/pull/38313
6246 [38327]: https://github.com/rust-lang/rust/pull/38327
6247 [38401]: https://github.com/rust-lang/rust/pull/38401
6248 [38413]: https://github.com/rust-lang/rust/pull/38413
6249 [38469]: https://github.com/rust-lang/rust/pull/38469
6250 [38559]: https://github.com/rust-lang/rust/pull/38559
6251 [38571]: https://github.com/rust-lang/rust/pull/38571
6252 [38580]: https://github.com/rust-lang/rust/pull/38580
6253 [38589]: https://github.com/rust-lang/rust/pull/38589
6254 [38670]: https://github.com/rust-lang/rust/pull/38670
6255 [38712]: https://github.com/rust-lang/rust/pull/38712
6256 [38726]: https://github.com/rust-lang/rust/pull/38726
6257 [38781]: https://github.com/rust-lang/rust/pull/38781
6258 [38798]: https://github.com/rust-lang/rust/pull/38798
6259 [38909]: https://github.com/rust-lang/rust/pull/38909
6260 [38920]: https://github.com/rust-lang/rust/pull/38920
6261 [38927]: https://github.com/rust-lang/rust/pull/38927
6262 [39048]: https://github.com/rust-lang/rust/pull/39048
6263 [39282]: https://github.com/rust-lang/rust/pull/39282
6264 [39379]: https://github.com/rust-lang/rust/pull/39379
6265 [41105]: https://github.com/rust-lang/rust/issues/41105
6266 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6267 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6268 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6269 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6270 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6271 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6272 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6273 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6274 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6275 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6276 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6277 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6278 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6279 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6280 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6281 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6282 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6283 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6284 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6285 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6286 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6287 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6288 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6289 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6290 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6291 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6292 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6293 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6294 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6297 Version 1.15.1 (2017-02-09)
6298 ===========================
6300 * [Fix IntoIter::as_mut_slice's signature][39466]
6301 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6303 [39466]: https://github.com/rust-lang/rust/pull/39466
6304 [39523]: https://github.com/rust-lang/rust/pull/39523
6307 Version 1.15.0 (2017-02-02)
6308 ===========================
6313 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6314 stable. This allows popular code-generating crates like Serde and Diesel to
6315 work ergonomically. [RFC 1681].
6316 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6317 with curly braces][36868]. Part of [RFC 1506].
6318 * [A number of minor changes to name resolution have been activated][37127].
6319 They add up to more consistent semantics, allowing for future evolution of
6320 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6321 details of what is different. The breaking changes here have been transitioned
6322 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6323 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6325 * [`?Sized` can be used in `where` clauses][37791]
6326 * [There is now a limit on the size of monomorphized types and it can be
6327 modified with the `#![type_size_limit]` crate attribute, similarly to
6328 the `#![recursion_limit]` attribute][37789]
6333 * [On Windows, the compiler will apply dllimport attributes when linking to
6334 extern functions][37973]. Additional attributes and flags can control which
6335 library kind is linked and its name. [RFC 1717].
6336 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6337 * [The `--test` flag works with procedural macro crates][38107]
6338 * [Fix `extern "aapcs" fn` ABI][37814]
6339 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6340 * [The `format!` expander recognizes incorrect `printf` and shell-style
6341 formatting directives and suggests the correct format][37613].
6342 * [Only report one error for all unused imports in an import list][37456]
6344 Compiler Performance
6345 --------------------
6347 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6348 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6349 * [Don't clone in `UnificationTable::probe`][37848]
6350 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6351 * [Use small vectors in type walker][37760]
6352 * [Macro expansion performance was improved][37701]
6353 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6354 * [Replace FNV with a faster hash function][37229]
6359 * [`std::iter::Iterator::min_by`]
6360 * [`std::iter::Iterator::max_by`]
6361 * [`std::os::*::fs::FileExt`]
6362 * [`std::sync::atomic::Atomic*::get_mut`]
6363 * [`std::sync::atomic::Atomic*::into_inner`]
6364 * [`std::vec::IntoIter::as_slice`]
6365 * [`std::vec::IntoIter::as_mut_slice`]
6366 * [`std::sync::mpsc::Receiver::try_iter`]
6367 * [`std::os::unix::process::CommandExt::before_exec`]
6368 * [`std::rc::Rc::strong_count`]
6369 * [`std::rc::Rc::weak_count`]
6370 * [`std::sync::Arc::strong_count`]
6371 * [`std::sync::Arc::weak_count`]
6372 * [`std::char::encode_utf8`]
6373 * [`std::char::encode_utf16`]
6374 * [`std::cell::Ref::clone`]
6375 * [`std::io::Take::into_inner`]
6380 * [The standard sorting algorithm has been rewritten for dramatic performance
6381 improvements][38192]. It is a hybrid merge sort, drawing influences from
6382 Timsort. Previously it was a naive merge sort.
6383 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6384 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6386 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6387 and `char_indices().last()`][37882]
6388 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6389 * [Chinese characters display correctly in `fmt::Debug`][37855]
6390 * [Derive `Default` for `Duration`][37699]
6391 * [Support creation of anonymous pipes on WinXP/2k][37677]
6392 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6393 * [Don't pass overlapped handles to processes][38835]
6398 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6399 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6400 should instead check the variable at runtime with `std::env`. That the value
6401 was set at build time was a bug, and incorrect when cross-compiling. This
6402 change is known to cause breakage.
6403 * [Add `--all` flag to `cargo test`][cargo/3221]
6404 * [Compile statically against the MSVC CRT][cargo/3363]
6405 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6406 * [Link OpenSSL statically on OSX][cargo/3311]
6407 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6408 * [Test for bad path overrides with summaries][cargo/3336]
6409 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6410 * [Fix retrying crate downloads for network errors][cargo/3348]
6411 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6412 * [Emit more info on --message-format=json][cargo/3319]
6413 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6414 * [Don't ignore errors in workspace manifest][cargo/3409]
6415 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6420 * [Test runners (binaries built with `--test`) now support a `--list` argument
6421 that lists the tests it contains][38185]
6422 * [Test runners now support a `--exact` argument that makes the test filter
6423 match exactly, instead of matching only a substring of the test name][38181]
6424 * [rustdoc supports a `--playground-url` flag][37763]
6425 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6430 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6431 continue to be used in this release by passing `--disable-rustbuild` to the
6432 configure script, but they will be deleted soon. Note that the new build
6433 system uses a different on-disk layout that will likely affect any scripts
6435 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6437 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6438 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6444 * [A number of minor changes to name resolution have been activated][37127].
6445 They add up to more consistent semantics, allowing for future evolution of
6446 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6447 details of what is different. The breaking changes here have been transitioned
6448 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6449 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6450 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6451 should instead check the variable at runtime with `std::env`. That the value
6452 was set at build time was a bug, and incorrect when cross-compiling. This
6453 change is known to cause breakage.
6454 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6455 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6456 1.10 and is now an error by default. It will become a hard error in the near
6458 * [The semantics relating modules to file system directories are changing in
6459 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6460 lint, which is a warning in this release, and will become a hard error in the
6462 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6463 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6464 the underlying iterator][37834]
6466 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6467 [33685]: https://github.com/rust-lang/rust/issues/33685
6468 [36868]: https://github.com/rust-lang/rust/pull/36868
6469 [37127]: https://github.com/rust-lang/rust/pull/37127
6470 [37229]: https://github.com/rust-lang/rust/pull/37229
6471 [37456]: https://github.com/rust-lang/rust/pull/37456
6472 [37527]: https://github.com/rust-lang/rust/pull/37527
6473 [37602]: https://github.com/rust-lang/rust/pull/37602
6474 [37613]: https://github.com/rust-lang/rust/pull/37613
6475 [37615]: https://github.com/rust-lang/rust/pull/37615
6476 [37636]: https://github.com/rust-lang/rust/pull/37636
6477 [37627]: https://github.com/rust-lang/rust/pull/37627
6478 [37642]: https://github.com/rust-lang/rust/pull/37642
6479 [37677]: https://github.com/rust-lang/rust/pull/37677
6480 [37699]: https://github.com/rust-lang/rust/pull/37699
6481 [37701]: https://github.com/rust-lang/rust/pull/37701
6482 [37705]: https://github.com/rust-lang/rust/pull/37705
6483 [37749]: https://github.com/rust-lang/rust/pull/37749
6484 [37760]: https://github.com/rust-lang/rust/pull/37760
6485 [37763]: https://github.com/rust-lang/rust/pull/37763
6486 [37764]: https://github.com/rust-lang/rust/pull/37764
6487 [37789]: https://github.com/rust-lang/rust/pull/37789
6488 [37791]: https://github.com/rust-lang/rust/pull/37791
6489 [37814]: https://github.com/rust-lang/rust/pull/37814
6490 [37817]: https://github.com/rust-lang/rust/pull/37817
6491 [37834]: https://github.com/rust-lang/rust/pull/37834
6492 [37848]: https://github.com/rust-lang/rust/pull/37848
6493 [37855]: https://github.com/rust-lang/rust/pull/37855
6494 [37882]: https://github.com/rust-lang/rust/pull/37882
6495 [37888]: https://github.com/rust-lang/rust/pull/37888
6496 [37973]: https://github.com/rust-lang/rust/pull/37973
6497 [37979]: https://github.com/rust-lang/rust/pull/37979
6498 [38086]: https://github.com/rust-lang/rust/pull/38086
6499 [38107]: https://github.com/rust-lang/rust/pull/38107
6500 [38117]: https://github.com/rust-lang/rust/pull/38117
6501 [38134]: https://github.com/rust-lang/rust/pull/38134
6502 [38146]: https://github.com/rust-lang/rust/pull/38146
6503 [38181]: https://github.com/rust-lang/rust/pull/38181
6504 [38182]: https://github.com/rust-lang/rust/pull/38182
6505 [38185]: https://github.com/rust-lang/rust/pull/38185
6506 [38192]: https://github.com/rust-lang/rust/pull/38192
6507 [38279]: https://github.com/rust-lang/rust/pull/38279
6508 [38835]: https://github.com/rust-lang/rust/pull/38835
6509 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6510 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6511 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6512 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6513 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6514 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6515 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6516 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6517 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6518 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6519 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6520 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6521 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6522 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6523 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6524 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6525 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6526 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6527 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6528 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6529 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6530 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6531 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6532 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6533 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6534 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6535 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6536 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6537 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6538 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6539 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6540 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6541 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6542 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6543 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6544 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6545 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6548 Version 1.14.0 (2016-12-22)
6549 ===========================
6554 * [`..` matches multiple tuple fields in enum variants, structs
6555 and tuples][36843]. [RFC 1492].
6556 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6557 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6558 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6559 dereferencing][36822]
6564 * [Mark enums with non-zero discriminant as non-zero][37224]
6565 * [Lower-case `static mut` names are linted like other
6566 statics and consts][37162]
6567 * [Fix ICE on some macros in const integer positions
6568 (e.g. `[u8; m!()]`)][36819]
6569 * [Improve error message and snippet for "did you mean `x`"][36798]
6570 * [Add a panic-strategy field to the target specification][36794]
6571 * [Include LLVM version in `--version --verbose`][37200]
6573 Compile-time Optimizations
6574 --------------------------
6576 * [Improve macro expansion performance][37569]
6577 * [Shrink `Expr_::ExprInlineAsm`][37445]
6578 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6579 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6580 * [Avoid more allocations when compiling html5ever][37373]
6581 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6582 * [Avoid some allocations in the macro parser][37318]
6583 * [Use a faster deflate setting][37298]
6584 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6585 during interning of slices][37270]
6586 * [Optimize `write_metadata`][37267]
6587 * [Don't process obligation forest cycles when stalled][37231]
6588 * [Avoid many `CrateConfig` clones][37161]
6589 * [Optimize `Substs::super_fold_with`][37108]
6590 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6591 * [Speed up `plug_leaks`][36917]
6596 * [`println!()`, with no arguments, prints newline][36825].
6597 Previously, an empty string was required to achieve the same.
6598 * [`Wrapping` impls standard binary and unary operators, as well as
6599 the `Sum` and `Product` iterators][37356]
6600 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6602 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6603 `VecDeque` iterators][37315]
6604 * [Improve `SipHasher` performance on small values][37312]
6605 * [Add Iterator trait TrustedLen to enable better FromIterator /
6607 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6608 * [`ReadDir` implements `Debug`][37221]
6609 * [Implement `RefUnwindSafe` for atomic types][37178]
6610 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6611 * [Avoid allocations in `Decoder::read_str`][37064]
6612 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6613 * [Impl `Debug` for raw pointers to unsized data][36880]
6614 * [Don't reuse `HashMap` random seeds][37470]
6615 * [The internal memory layout of `HashMap` is more cache-friendly, for
6616 significant improvements in some operations][36692]
6617 * [`HashMap` uses less memory on 32-bit architectures][36595]
6618 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6623 * [Expose rustc cfg values to build scripts][cargo/3243]
6624 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6625 * [Fix passing --features when testing multiple packages][cargo/3280]
6626 * [Use a single profile set per workspace][cargo/3249]
6627 * [Load `replace` sections from lock files][cargo/3220]
6628 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6633 * [rustup is the recommended Rust installation method][1.14rustup]
6634 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6635 S390x. These are [tier 2] platforms and may have major defects. Follow the
6636 instructions on the website to install, or add the targets to an existing
6637 installation with `rustup target add`. The new target triples are:
6638 - `mips-unknown-linux-gnu`
6639 - `mipsel-unknown-linux-gnu`
6640 - `mips64-unknown-linux-gnuabi64`
6641 - `mips64el-unknown-linux-gnuabi64 `
6642 - `powerpc-unknown-linux-gnu`
6643 - `powerpc64-unknown-linux-gnu`
6644 - `powerpc64le-unknown-linux-gnu`
6645 - `s390x-unknown-linux-gnu `
6646 * This release includes target (std) builds for ARM Linux running MUSL
6647 libc. These are [tier 2] platforms and may have major defects. Add the
6648 following triples to an existing rustup installation with `rustup target add`:
6649 - `arm-unknown-linux-musleabi`
6650 - `arm-unknown-linux-musleabihf`
6651 - `armv7-unknown-linux-musleabihf`
6652 * This release includes [experimental support for WebAssembly][1.14wasm], via
6653 the `wasm32-unknown-emscripten` target. This target is known to have major
6654 defects. Please test, report, and fix.
6655 * rustup no longer installs documentation by default. Run `rustup
6656 component add rust-docs` to install.
6657 * [Fix line stepping in debugger][37310]
6658 * [Enable line number debuginfo in releases][37280]
6663 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6664 * [Add support for Fuchsia OS][37313]
6665 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6670 * [A number of forward-compatibility lints used by the compiler
6671 to gradually introduce language changes have been converted
6672 to deny by default][36894]:
6673 - ["use of inaccessible extern crate erroneously allowed"][36886]
6674 - ["type parameter default erroneously allowed in invalid location"][36887]
6675 - ["detects super or self keywords at the beginning of global path"][36888]
6676 - ["two overlapping inherent impls define an item with the same name
6677 were erroneously allowed"][36889]
6678 - ["floating-point constants cannot be used in patterns"][36890]
6679 - ["constants of struct or enum type can only be used in a pattern if
6680 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6681 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6682 * [Prohibit patterns in trait methods without bodies][37378]
6683 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6684 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6685 * [The `$crate` macro variable is accepted in fewer locations][37213]
6686 * [Impls specifying extra region requirements beyond the trait
6687 they implement are rejected][37167]
6688 * [Enums may not be unsized][37111]. Unsized enums are intended to
6689 work but never have. For now they are forbidden.
6690 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6692 [tier 2]: https://forge.rust-lang.org/platform-support.html
6693 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6694 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6695 [36430]: https://github.com/rust-lang/rust/pull/36430
6696 [36595]: https://github.com/rust-lang/rust/pull/36595
6697 [36692]: https://github.com/rust-lang/rust/pull/36692
6698 [36767]: https://github.com/rust-lang/rust/pull/36767
6699 [36794]: https://github.com/rust-lang/rust/pull/36794
6700 [36798]: https://github.com/rust-lang/rust/pull/36798
6701 [36819]: https://github.com/rust-lang/rust/pull/36819
6702 [36822]: https://github.com/rust-lang/rust/pull/36822
6703 [36825]: https://github.com/rust-lang/rust/pull/36825
6704 [36843]: https://github.com/rust-lang/rust/pull/36843
6705 [36880]: https://github.com/rust-lang/rust/pull/36880
6706 [36886]: https://github.com/rust-lang/rust/issues/36886
6707 [36887]: https://github.com/rust-lang/rust/issues/36887
6708 [36888]: https://github.com/rust-lang/rust/issues/36888
6709 [36889]: https://github.com/rust-lang/rust/issues/36889
6710 [36890]: https://github.com/rust-lang/rust/issues/36890
6711 [36891]: https://github.com/rust-lang/rust/issues/36891
6712 [36892]: https://github.com/rust-lang/rust/issues/36892
6713 [36894]: https://github.com/rust-lang/rust/pull/36894
6714 [36917]: https://github.com/rust-lang/rust/pull/36917
6715 [36993]: https://github.com/rust-lang/rust/pull/36993
6716 [37037]: https://github.com/rust-lang/rust/pull/37037
6717 [37064]: https://github.com/rust-lang/rust/pull/37064
6718 [37094]: https://github.com/rust-lang/rust/pull/37094
6719 [37108]: https://github.com/rust-lang/rust/pull/37108
6720 [37111]: https://github.com/rust-lang/rust/pull/37111
6721 [37161]: https://github.com/rust-lang/rust/pull/37161
6722 [37162]: https://github.com/rust-lang/rust/pull/37162
6723 [37167]: https://github.com/rust-lang/rust/pull/37167
6724 [37178]: https://github.com/rust-lang/rust/pull/37178
6725 [37200]: https://github.com/rust-lang/rust/pull/37200
6726 [37213]: https://github.com/rust-lang/rust/pull/37213
6727 [37221]: https://github.com/rust-lang/rust/pull/37221
6728 [37224]: https://github.com/rust-lang/rust/pull/37224
6729 [37230]: https://github.com/rust-lang/rust/pull/37230
6730 [37231]: https://github.com/rust-lang/rust/pull/37231
6731 [37247]: https://github.com/rust-lang/rust/pull/37247
6732 [37267]: https://github.com/rust-lang/rust/pull/37267
6733 [37270]: https://github.com/rust-lang/rust/pull/37270
6734 [37273]: https://github.com/rust-lang/rust/pull/37273
6735 [37280]: https://github.com/rust-lang/rust/pull/37280
6736 [37298]: https://github.com/rust-lang/rust/pull/37298
6737 [37306]: https://github.com/rust-lang/rust/pull/37306
6738 [37310]: https://github.com/rust-lang/rust/pull/37310
6739 [37312]: https://github.com/rust-lang/rust/pull/37312
6740 [37313]: https://github.com/rust-lang/rust/pull/37313
6741 [37315]: https://github.com/rust-lang/rust/pull/37315
6742 [37318]: https://github.com/rust-lang/rust/pull/37318
6743 [37322]: https://github.com/rust-lang/rust/pull/37322
6744 [37326]: https://github.com/rust-lang/rust/pull/37326
6745 [37351]: https://github.com/rust-lang/rust/pull/37351
6746 [37356]: https://github.com/rust-lang/rust/pull/37356
6747 [37367]: https://github.com/rust-lang/rust/pull/37367
6748 [37373]: https://github.com/rust-lang/rust/pull/37373
6749 [37378]: https://github.com/rust-lang/rust/pull/37378
6750 [37389]: https://github.com/rust-lang/rust/pull/37389
6751 [37392]: https://github.com/rust-lang/rust/pull/37392
6752 [37427]: https://github.com/rust-lang/rust/pull/37427
6753 [37439]: https://github.com/rust-lang/rust/pull/37439
6754 [37445]: https://github.com/rust-lang/rust/pull/37445
6755 [37470]: https://github.com/rust-lang/rust/pull/37470
6756 [37569]: https://github.com/rust-lang/rust/pull/37569
6757 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6758 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6759 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6760 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6761 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6762 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6763 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6766 Version 1.13.0 (2016-11-10)
6767 ===========================
6772 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6773 errors, like the `try!` macro, described in [RFC 0243].
6774 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6775 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6776 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6777 * [Fix lifetime rules for 'if' conditions][36029]
6778 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6783 * [Add the `-C link-arg` argument][36574]
6784 * [Remove the old AST-based backend from rustc_trans][35764]
6785 * [Don't enable NEON by default on armv7 Linux][35814]
6786 * [Fix debug line number info for macro expansions][35238]
6787 * [Do not emit "class method" debuginfo for types that are not
6788 DICompositeType][36008]
6789 * [Warn about multiple conflicting #[repr] hints][34623]
6790 * [When sizing DST, don't double-count nested struct prefixes][36351]
6791 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6792 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6793 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6794 * [Expand macros without recursing to avoid stack overflows][36214]
6799 * [Replace macro backtraces with labeled local uses][35702]
6800 * [Improve error message for misplaced doc comments][33922]
6801 * [Buffer unix and lock windows to prevent message interleaving][35975]
6802 * [Update lifetime errors to specifically note temporaries][36171]
6803 * [Special case a few colors for Windows][36178]
6804 * [Suggest `use self` when such an import resolves][36289]
6805 * [Be more specific when type parameter shadows primitive type][36338]
6806 * Many minor improvements
6808 Compile-time Optimizations
6809 --------------------------
6811 * [Compute and cache HIR hashes at beginning][35854]
6812 * [Don't hash types in loan paths][36004]
6813 * [Cache projections in trans][35761]
6814 * [Optimize the parser's last token handling][36527]
6815 * [Only instantiate #[inline] functions in codegen units referencing
6816 them][36524]. This leads to big improvements in cases where crates export
6817 define many inline functions without using them directly.
6818 * [Lazily allocate TypedArena's first chunk][36592]
6819 * [Don't allocate during default HashSet creation][36734]
6826 * [`overflowing_abs`]
6827 * [`RefCell::try_borrow`]
6828 * [`RefCell::try_borrow_mut`]
6833 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6834 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6836 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6837 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6838 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6839 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6840 * [Use arc4rand on FreeBSD][35884]
6841 * [memrchr: Correct aligned offset computation][35969]
6842 * [Improve Demangling of Rust Symbols][36059]
6843 * [Use monotonic time in condition variables][35048]
6844 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6845 * [Implement conversion traits for `char`][35755]
6846 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6847 * [Zero first byte of CString on drop][36264]
6848 * [Inherit overflow checks for sum and product][36372]
6849 * [Add missing Eq implementations][36423]
6850 * [Implement `Debug` for `DirEntry`][36631]
6851 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6853 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6854 * [Implement more traits for `std::io::ErrorKind`][35911]
6855 * [Optimize BinaryHeap bounds checking][36072]
6856 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6857 `extend_with_element`][36355]
6858 * [Fix overflow checking in unsigned pow()][34942]
6863 * This release includes security fixes to both curl and OpenSSL.
6864 * [Fix transitive doctests when panic=abort][cargo/3021]
6865 * [Add --all-features flag to cargo][cargo/3038]
6866 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6867 * [Don't parse the home directory more than once][cargo/3078]
6868 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6869 * [Update OpenSSL to 1.0.2j][cargo/3121]
6870 * [Add license and license_file to cargo metadata output][cargo/3110]
6871 * [Make crates-io registry URL optional in config; ignore all changes to
6872 source.crates-io][cargo/3089]
6873 * [Don't download dependencies from other platforms][cargo/3123]
6874 * [Build transitive dev-dependencies when needed][cargo/3125]
6875 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6876 * [Avoid updating registry when adding existing deps][cargo/3144]
6877 * [Warn about path overrides that won't work][cargo/3136]
6878 * [Use workspaces during `cargo install`][cargo/3146]
6879 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6880 * [Add --message-format flag][cargo/3000]
6881 * [Pass target environment for rustdoc][cargo/3205]
6882 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6883 * [Update curl and curl-sys][cargo/3241]
6884 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6889 * [rustdoc: Add the `--sysroot` argument][36586]
6890 * [rustdoc: Fix a couple of issues with the search results][35655]
6891 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6892 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6893 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6898 * [Remove unmaintained style guide][35124]
6899 * [Add s390x support][36369]
6900 * [Initial work at Haiku OS support][36727]
6901 * [Add mips-uclibc targets][35734]
6902 * [Crate-ify compiler-rt into compiler-builtins][35021]
6903 * [Add rustc version info (git hash + date) to dist tarball][36213]
6904 * Many documentation improvements
6909 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6910 * [Deny (by default) transmuting from fn item types to pointer-sized
6911 types][34923]. Continuing the long transition to zero-sized fn items,
6913 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6915 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6916 * [Fix lifetime rules for 'if' conditions][36029].
6917 * [Inherit overflow checks for sum and product][36372].
6918 * [Forbid user-defined macros named "macro_rules"][36730].
6920 [33922]: https://github.com/rust-lang/rust/pull/33922
6921 [34623]: https://github.com/rust-lang/rust/pull/34623
6922 [34923]: https://github.com/rust-lang/rust/pull/34923
6923 [34942]: https://github.com/rust-lang/rust/pull/34942
6924 [35021]: https://github.com/rust-lang/rust/pull/35021
6925 [35048]: https://github.com/rust-lang/rust/pull/35048
6926 [35074]: https://github.com/rust-lang/rust/pull/35074
6927 [35124]: https://github.com/rust-lang/rust/pull/35124
6928 [35234]: https://github.com/rust-lang/rust/pull/35234
6929 [35238]: https://github.com/rust-lang/rust/pull/35238
6930 [35354]: https://github.com/rust-lang/rust/pull/35354
6931 [35559]: https://github.com/rust-lang/rust/pull/35559
6932 [35585]: https://github.com/rust-lang/rust/pull/35585
6933 [35627]: https://github.com/rust-lang/rust/pull/35627
6934 [35655]: https://github.com/rust-lang/rust/pull/35655
6935 [35702]: https://github.com/rust-lang/rust/pull/35702
6936 [35707]: https://github.com/rust-lang/rust/pull/35707
6937 [35728]: https://github.com/rust-lang/rust/pull/35728
6938 [35734]: https://github.com/rust-lang/rust/pull/35734
6939 [35755]: https://github.com/rust-lang/rust/pull/35755
6940 [35761]: https://github.com/rust-lang/rust/pull/35761
6941 [35764]: https://github.com/rust-lang/rust/pull/35764
6942 [35814]: https://github.com/rust-lang/rust/pull/35814
6943 [35854]: https://github.com/rust-lang/rust/pull/35854
6944 [35871]: https://github.com/rust-lang/rust/pull/35871
6945 [35884]: https://github.com/rust-lang/rust/pull/35884
6946 [35911]: https://github.com/rust-lang/rust/pull/35911
6947 [35969]: https://github.com/rust-lang/rust/pull/35969
6948 [35975]: https://github.com/rust-lang/rust/pull/35975
6949 [36004]: https://github.com/rust-lang/rust/pull/36004
6950 [36008]: https://github.com/rust-lang/rust/pull/36008
6951 [36014]: https://github.com/rust-lang/rust/pull/36014
6952 [36029]: https://github.com/rust-lang/rust/pull/36029
6953 [36059]: https://github.com/rust-lang/rust/pull/36059
6954 [36072]: https://github.com/rust-lang/rust/pull/36072
6955 [36101]: https://github.com/rust-lang/rust/pull/36101
6956 [36104]: https://github.com/rust-lang/rust/pull/36104
6957 [36171]: https://github.com/rust-lang/rust/pull/36171
6958 [36173]: https://github.com/rust-lang/rust/pull/36173
6959 [36178]: https://github.com/rust-lang/rust/pull/36178
6960 [36213]: https://github.com/rust-lang/rust/pull/36213
6961 [36214]: https://github.com/rust-lang/rust/pull/36214
6962 [36264]: https://github.com/rust-lang/rust/pull/36264
6963 [36266]: https://github.com/rust-lang/rust/pull/36266
6964 [36289]: https://github.com/rust-lang/rust/pull/36289
6965 [36338]: https://github.com/rust-lang/rust/pull/36338
6966 [36351]: https://github.com/rust-lang/rust/pull/36351
6967 [36355]: https://github.com/rust-lang/rust/pull/36355
6968 [36369]: https://github.com/rust-lang/rust/pull/36369
6969 [36372]: https://github.com/rust-lang/rust/pull/36372
6970 [36423]: https://github.com/rust-lang/rust/pull/36423
6971 [36482]: https://github.com/rust-lang/rust/pull/36482
6972 [36505]: https://github.com/rust-lang/rust/pull/36505
6973 [36524]: https://github.com/rust-lang/rust/pull/36524
6974 [36527]: https://github.com/rust-lang/rust/pull/36527
6975 [36551]: https://github.com/rust-lang/rust/pull/36551
6976 [36574]: https://github.com/rust-lang/rust/pull/36574
6977 [36586]: https://github.com/rust-lang/rust/pull/36586
6978 [36592]: https://github.com/rust-lang/rust/pull/36592
6979 [36631]: https://github.com/rust-lang/rust/pull/36631
6980 [36721]: https://github.com/rust-lang/rust/pull/36721
6981 [36727]: https://github.com/rust-lang/rust/pull/36727
6982 [36730]: https://github.com/rust-lang/rust/pull/36730
6983 [36734]: https://github.com/rust-lang/rust/pull/36734
6984 [36754]: https://github.com/rust-lang/rust/pull/36754
6985 [36995]: https://github.com/rust-lang/rust/pull/36995
6986 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6987 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6988 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6989 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6990 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6991 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6992 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6993 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6994 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6995 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6996 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6997 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6998 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6999 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7000 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7001 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7002 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7003 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7004 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7005 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7006 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7007 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7008 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7009 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7010 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7011 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7012 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7013 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7014 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7015 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7016 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7017 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7020 Version 1.12.1 (2016-10-20)
7021 ===========================
7026 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7027 * [Confusion with double negation and booleans][36856]
7028 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7029 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7030 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7031 * [Corrupted memory after updated to 1.12][36936]
7032 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7033 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7034 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7036 [36381]: https://github.com/rust-lang/rust/issues/36381
7037 [36856]: https://github.com/rust-lang/rust/issues/36856
7038 [36875]: https://github.com/rust-lang/rust/issues/36875
7039 [36924]: https://github.com/rust-lang/rust/issues/36924
7040 [36926]: https://github.com/rust-lang/rust/issues/36926
7041 [36936]: https://github.com/rust-lang/rust/issues/36936
7042 [37026]: https://github.com/rust-lang/rust/issues/37026
7043 [37112]: https://github.com/rust-lang/rust/issues/37112
7044 [37153]: https://github.com/rust-lang/rust/issues/37153
7047 Version 1.12.0 (2016-09-29)
7048 ===========================
7053 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7054 This translation pass is far simpler than the previous AST->LLVM pass, and
7055 creates opportunities to perform new optimizations directly on the MIR. It
7056 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7057 * [`rustc` presents a new, more readable error format, along with
7058 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7059 Most common editors supporting Rust have been updated to work with it. It was
7060 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7065 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7066 This translation pass is far simpler than the previous AST->LLVM pass, and
7067 creates opportunities to perform new optimizations directly on the MIR. It
7068 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7069 * [Print the Rust target name, not the LLVM target name, with
7070 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7071 * [The computation of `TypeId` is correct in some cases where it was previously
7072 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7073 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7074 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7075 `--print relocation-models`, and `--print code-models` print the available
7076 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7077 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7078 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7079 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7080 These targets produce statically-linked binaries. There are no binary release
7086 * [`rustc` presents a new, more readable error format, along with
7087 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7088 Most common editors supporting Rust have been updated to work with it. It was
7089 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7090 * [In error descriptions, references are now described in plain English,
7091 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7092 * [In error type descriptions, unknown numeric types are named `{integer}` or
7093 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7094 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7099 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7100 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7101 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7102 useful](https://github.com/rust-lang/rust/pull/34908)
7103 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7104 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7105 * [Semicolons are properly required as statement delimiters inside
7106 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7107 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7112 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7113 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7114 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7115 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7116 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7117 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7118 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7119 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7120 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7121 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7122 Both on Unix and Windows.
7123 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7124 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7125 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7126 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7127 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7128 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7129 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7130 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7135 * [The `format!` macro and friends now allow a single argument to be formatted
7136 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7137 * [The lifetime bounds on `[T]::binary_search_by` and
7138 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7139 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7140 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7141 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7142 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7143 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7144 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7145 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7146 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7147 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7148 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7149 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7150 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7151 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7152 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7153 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7154 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7155 * [`mpsc::sync_channel` `Receiver`s return any available message before
7156 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7157 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7158 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7163 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7164 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7165 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7166 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7167 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7168 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7169 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7170 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7171 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7172 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7173 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7174 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7175 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7176 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7177 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7178 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7183 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7184 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7189 * [Test binaries now support a `--test-threads` argument to specify the number
7190 of threads used to run tests, and which acts the same as the
7191 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7192 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7193 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7194 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7195 * [Rust releases now come with source packages that can be installed by rustup
7196 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7197 The resulting source code can be used by tools and IDES, located in the
7198 sysroot under `lib/rustlib/src`.
7203 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7204 * Many minor improvements to the documentation.
7205 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7210 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7211 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7212 * [When formatting strings, if "precision" is specified, the "fill",
7213 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7214 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7217 Version 1.11.0 (2016-08-18)
7218 ===========================
7223 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7224 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7225 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7226 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7231 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7232 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7233 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7234 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7235 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7236 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7237 (in libcore - previously stabilized in libstd)
7238 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7239 (in libcore - previously stabilized in libstd)
7240 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7241 (in libcore - previously stabilized in libstd)
7242 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7243 (in libcore - previously stabilized in libstd)
7244 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7245 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7246 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7247 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7252 * [The `thread_local!` macro supports multiple definitions in a single
7253 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7254 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7255 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7256 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7257 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7258 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7259 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7260 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7265 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7266 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7267 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7268 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7269 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7270 and `-vv` prints warnings for all crates.
7271 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7272 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7273 This provides room for expansion by arbitrary tools.
7274 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7275 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7276 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7277 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7278 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7279 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7280 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7285 * [Caching projections speeds up type check dramatically for some
7286 workloads](https://github.com/rust-lang/rust/pull/33816)
7287 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7288 This hasher is faster, but is believed to provide sufficient
7289 protection from collision attacks.
7290 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7295 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7296 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7297 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7298 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7299 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7304 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7305 * [When emitting debug info, rustc emits frame pointers for closures,
7306 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7307 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7308 * Many more errors have been given error codes and extended
7310 * API documentation continues to be improved, with many new examples
7315 * [rustc no longer hangs when dependencies recursively re-export
7316 submodules](https://github.com/rust-lang/rust/pull/34542)
7317 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7318 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7319 rewritten](https://github.com/rust-lang/rust/pull/33895)
7320 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7321 No targets use this yet, but it works toward AVR support.
7326 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7327 * [The new follow-set rules that place restrictions on `macro_rules!`
7328 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7329 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7330 and has been a warning since 1.10.
7331 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7332 This causes breakage in some corner cases.
7335 Version 1.10.0 (2016-07-07)
7336 ===========================
7341 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7342 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7343 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7344 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7345 * [`panic!` can be converted to a runtime abort with the
7346 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7347 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7348 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7349 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7350 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7351 Note that Cargo does not yet directly support cdylibs.
7356 * `os::windows::fs::OpenOptionsExt::access_mode`
7357 * `os::windows::fs::OpenOptionsExt::share_mode`
7358 * `os::windows::fs::OpenOptionsExt::custom_flags`
7359 * `os::windows::fs::OpenOptionsExt::attributes`
7360 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7361 * `os::unix::fs::OpenOptionsExt::custom_flags`
7362 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7363 * `Default for sync::Weak`
7364 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7365 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7366 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7367 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7368 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7369 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7370 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7371 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7372 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7373 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7374 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7375 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7376 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7377 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7378 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7379 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7380 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7381 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7382 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7383 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7384 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7385 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7386 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7387 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7388 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7389 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7390 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7391 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7392 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7393 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7394 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7395 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7396 * Read/Write/RawFd impls for `UnixStream`
7397 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7398 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7399 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7400 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7401 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7402 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7403 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7404 * RawFd impls for `UnixListener`
7405 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7406 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7407 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7408 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7409 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7410 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7411 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7412 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7413 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7414 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7415 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7416 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7417 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7418 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7419 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7420 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7421 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7422 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7423 * RawFd impls for `UnixDatagram`
7424 * `{BTree,Hash}Map::values_mut`
7425 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7430 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7431 The semantics of this minor method are subtle and probably not what
7433 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7434 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7435 will fall back to `/dev/urandom` temporarily to avoid blocking
7436 during early boot](https://github.com/rust-lang/rust/pull/33086).
7437 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7438 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7439 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7440 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7441 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7442 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7443 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7447 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7448 This controls the runtime behavior of the `panic!` macro
7449 and can be either "unwind" (the default), or "abort".
7450 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7451 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7452 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7453 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7454 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7455 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7456 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7457 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7458 By default they are retried twice, which can be customized with the
7459 `net.retry` value in `.cargo/config`.
7460 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7461 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7462 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7463 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7464 Makes it possible to install multiple crates in parallel.
7465 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7466 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7467 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7468 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7469 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7470 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7475 * [rustc memory usage was reduced by refactoring the context used for
7476 type checking](https://github.com/rust-lang/rust/pull/33425).
7477 * [Speed up creation of `HashMap`s by caching the random keys used
7478 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7479 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7480 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7481 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7482 10x faster than the previous lookup tables.
7483 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7488 * Many incremental improvements to documentation and rustdoc.
7489 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7490 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7491 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7492 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7493 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7494 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7495 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7500 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7501 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7502 * [`std` no longer prints backtraces on platforms where the running
7503 module must be loaded with `env::current_exe`, which can't be relied
7504 on](https://github.com/rust-lang/rust/pull/33554).
7505 * This release includes std binaries for the i586-unknown-linux-gnu,
7506 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7507 i586 target is for old x86 hardware without SSE2, and the armv7
7508 target is for Android running on modern ARM architectures.
7509 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7510 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7511 * [On Unix the runtime aborts by calling `libc::abort` instead of
7512 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7513 * [Rust is now bootstrapped from the previous release of Rust,
7514 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7519 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7520 * [`target_env` for Linux ARM targets is just `gnu`, not
7521 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7522 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7523 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7524 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7525 Affects how macros are parsed.
7526 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7527 * [Feature-gated attributes on macro-generated macro invocations are
7528 now rejected](https://github.com/rust-lang/rust/pull/32791).
7529 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7530 This caused some minor changes to type inference.
7533 Version 1.9.0 (2016-05-26)
7534 ==========================
7539 * The `#[deprecated]` attribute when applied to an API will generate
7540 warnings when used. The warnings may be suppressed with
7541 `#[allow(deprecated)]`. [RFC 1270].
7542 * [`fn` item types are zero sized, and each `fn` names a unique
7543 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7544 `transmute` on a `fn` type will generate a warning for a few cycles,
7545 then will be converted to an error.
7546 * [Field and method resolution understand visibility, so private
7547 fields and methods cannot prevent the proper use of public fields
7548 and methods][1.9fv].
7549 * [The parser considers unicode codepoints in the
7550 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7556 * [`std::panic::catch_unwind`] (renamed from `recover`)
7557 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7558 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7559 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7560 * [`str::is_char_boundary`]
7561 * [`<*const T>::as_ref`]
7562 * [`<*mut T>::as_ref`]
7563 * [`<*mut T>::as_mut`]
7564 * [`AsciiExt::make_ascii_uppercase`]
7565 * [`AsciiExt::make_ascii_lowercase`]
7566 * [`char::decode_utf16`]
7567 * [`char::DecodeUtf16`]
7568 * [`char::DecodeUtf16Error`]
7569 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7570 * [`BTreeSet::take`]
7571 * [`BTreeSet::replace`]
7574 * [`HashSet::replace`]
7576 * [`OsString::with_capacity`]
7577 * [`OsString::clear`]
7578 * [`OsString::capacity`]
7579 * [`OsString::reserve`]
7580 * [`OsString::reserve_exact`]
7581 * [`OsStr::is_empty`]
7583 * [`std::os::unix::thread`]
7586 * [`JoinHandleExt::as_pthread_t`]
7587 * [`JoinHandleExt::into_pthread_t`]
7588 * [`HashSet::hasher`]
7589 * [`HashMap::hasher`]
7590 * [`CommandExt::exec`]
7591 * [`File::try_clone`]
7592 * [`SocketAddr::set_ip`]
7593 * [`SocketAddr::set_port`]
7594 * [`SocketAddrV4::set_ip`]
7595 * [`SocketAddrV4::set_port`]
7596 * [`SocketAddrV6::set_ip`]
7597 * [`SocketAddrV6::set_port`]
7598 * [`SocketAddrV6::set_flowinfo`]
7599 * [`SocketAddrV6::set_scope_id`]
7600 * [`slice::copy_from_slice`]
7601 * [`ptr::read_volatile`]
7602 * [`ptr::write_volatile`]
7603 * [`OpenOptions::create_new`]
7604 * [`TcpStream::set_nodelay`]
7605 * [`TcpStream::nodelay`]
7606 * [`TcpStream::set_ttl`]
7607 * [`TcpStream::ttl`]
7608 * [`TcpStream::set_only_v6`]
7609 * [`TcpStream::only_v6`]
7610 * [`TcpStream::take_error`]
7611 * [`TcpStream::set_nonblocking`]
7612 * [`TcpListener::set_ttl`]
7613 * [`TcpListener::ttl`]
7614 * [`TcpListener::set_only_v6`]
7615 * [`TcpListener::only_v6`]
7616 * [`TcpListener::take_error`]
7617 * [`TcpListener::set_nonblocking`]
7618 * [`UdpSocket::set_broadcast`]
7619 * [`UdpSocket::broadcast`]
7620 * [`UdpSocket::set_multicast_loop_v4`]
7621 * [`UdpSocket::multicast_loop_v4`]
7622 * [`UdpSocket::set_multicast_ttl_v4`]
7623 * [`UdpSocket::multicast_ttl_v4`]
7624 * [`UdpSocket::set_multicast_loop_v6`]
7625 * [`UdpSocket::multicast_loop_v6`]
7626 * [`UdpSocket::set_multicast_ttl_v6`]
7627 * [`UdpSocket::multicast_ttl_v6`]
7628 * [`UdpSocket::set_ttl`]
7629 * [`UdpSocket::ttl`]
7630 * [`UdpSocket::set_only_v6`]
7631 * [`UdpSocket::only_v6`]
7632 * [`UdpSocket::join_multicast_v4`]
7633 * [`UdpSocket::join_multicast_v6`]
7634 * [`UdpSocket::leave_multicast_v4`]
7635 * [`UdpSocket::leave_multicast_v6`]
7636 * [`UdpSocket::take_error`]
7637 * [`UdpSocket::connect`]
7638 * [`UdpSocket::send`]
7639 * [`UdpSocket::recv`]
7640 * [`UdpSocket::set_nonblocking`]
7645 * [`std::sync::Once` is poisoned if its initialization function
7647 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7648 * [Most types implement `fmt::Debug`][1.9db].
7649 * [The default buffer size used by `BufReader` and `BufWriter` was
7650 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7651 used by other languages.
7652 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7653 `Duration` additionally implements `*=` and `/=`][1.9ta].
7654 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7655 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7656 * [`Chain` implements `BufRead`][1.9ch].
7657 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7662 * [Cargo can now run concurrently][1.9cc].
7663 * [Top-level overrides allow specific revisions of crates to be
7664 overridden through the entire crate graph][1.9ct]. This is intended
7665 to make upgrades easier for large projects, by allowing crates to be
7666 forked temporarily until they've been upgraded and republished.
7667 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7668 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7669 on the commandline][1.9cf]. `rustc` arguments can also be specified
7670 in the `build.rustflags` configuration key.
7675 * [The time complexity of comparing variables for equivalence during type
7676 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7677 to major compilation time improvement in some scenarios.
7678 * [`ToString` is specialized for `str`, giving it the same performance
7679 as `to_owned`][1.9ts].
7680 * [Spawning processes with `Command::output` no longer creates extra
7682 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7683 for C-like enums][1.9cl].
7688 * [Passing the `--quiet` flag to a test runner will produce
7689 much-abbreviated output][1.9q].
7690 * The Rust Project now publishes std binaries for the
7691 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7692 `i586-pc-windows-msvc` targets.
7697 * [`std::sync::Once` is poisoned if its initialization function
7699 * [It is illegal to define methods with the same name in overlapping
7700 inherent `impl` blocks][1.9sn].
7701 * [`fn` item types are zero sized, and each `fn` names a unique
7702 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7703 `transmute` on a `fn` type will generate a warning for a few cycles,
7704 then will be converted to an error.
7705 * [Improvements to const evaluation may trigger new errors when integer
7706 literals are out of range][1.9ce].
7709 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7710 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7711 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7712 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7713 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7714 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7715 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7716 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7717 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7718 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7719 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7720 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7721 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7722 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7723 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7724 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7725 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7726 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7727 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7728 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7729 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7730 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7731 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7732 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7733 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7734 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7735 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7736 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7737 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7738 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7739 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7740 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7741 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7742 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7743 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7744 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7745 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7746 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7747 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7748 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7749 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7750 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7751 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7752 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7753 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7754 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7755 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7756 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7757 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7758 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7759 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7760 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7761 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7762 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7763 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7764 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7765 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7766 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7767 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7768 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7769 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7770 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7771 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7772 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7773 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7774 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7775 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7776 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7777 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7778 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7779 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7780 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7781 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7782 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7783 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7784 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7785 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7786 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7787 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7788 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7789 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7790 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7791 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7792 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7793 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7794 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7795 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7796 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7797 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7798 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7799 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7800 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7801 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7802 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7803 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7804 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7805 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7806 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7807 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7808 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7809 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7810 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7811 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7812 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7813 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7814 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7815 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7816 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7817 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7818 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7821 Version 1.8.0 (2016-04-14)
7822 ==========================
7827 * Rust supports overloading of compound assignment statements like
7828 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7829 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7830 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7832 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7833 addition to the non-braced form, `struct Foo;`. [RFC 218].
7839 * [`str::encode_utf16`] (renamed from `utf16_units`)
7840 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7843 * [`ptr::drop_in_place`]
7845 * [`time::SystemTime`]
7847 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7848 * [`Instant::elapsed`]
7849 * [`SystemTime::now`]
7850 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7851 * [`SystemTime::elapsed`]
7852 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7853 * [`SystemTimeError`]
7854 * [`SystemTimeError::duration`]
7855 * Various impls for `SystemTimeError`
7857 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7858 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7859 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7860 * [The `write!` and `writeln!` macros correctly emit errors if any of
7861 their arguments can't be formatted][1.8w].
7862 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7863 * [The Unix-specific `raw` modules, which contain a number of
7864 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7865 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7866 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7867 across platforms was making it difficult to implement `std`
7868 correctly. Those that need these definitions should use the `libc`
7870 * The Unix-specific `MetadataExt` traits, including
7871 `os::unix::fs::MetadataExt`, which expose values such as inode
7872 numbers [no longer return platform-specific types][1.8r], but
7873 instead return widened integers. [RFC 1415].
7874 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7875 * [Atomic loads and stores are not volatile][1.8a].
7876 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7881 * [Inlining hash functions lead to a 3% compile-time improvement in
7882 some workloads][1.8h].
7883 * When using jemalloc, its symbols are [unprefixed so that it
7884 overrides the libc malloc implementation][1.8h]. This means that for
7885 rustc, LLVM is now using jemalloc, which results in a 6%
7886 compile-time improvement on a specific workload.
7887 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7892 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7893 i686-pc-windows-msvc is now considered a tier-1 platform.
7894 * [The `--print targets` flag prints a list of supported targets][1.8t].
7895 * [The `--print cfg` flag prints the `cfg`s defined for the current
7897 * [`rustc` can be built with an new Cargo-based build system, written
7898 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7899 build system. To enable it configure with `configure --rustbuild`.
7900 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7901 variants while also indicating the total number of missing variants
7902 if more than 3][1.8m].
7903 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7904 * The Rust Project now publishes binary releases of the standard
7905 library for a number of tier-2 targets:
7906 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7907 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7908 `x86_64-rumprun-netbsd`. These can be installed with
7909 tools such as [multirust][1.8mr].
7914 * [`cargo init` creates a new Cargo project in the current
7915 directory][1.8ci]. It is otherwise like `cargo new`.
7916 * [Cargo has configuration keys for `-v` and
7917 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7918 `[term]` section of `.cargo/config`.
7919 * [Configuration keys that evaluate to strings or integers can be set
7920 via environment variables][1.8ce]. For example the `build.jobs` key
7921 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7922 precedence over config files.
7923 * [Target-specific dependencies support Rust `cfg` syntax for
7924 describing targets][1.8cfg] so that dependencies for multiple
7925 targets can be specified together. [RFC 1361].
7926 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7927 `RUSTDOC` take precedence over the `build.target-dir`,
7928 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
7929 * [The child process tree is killed on Windows when Cargo is
7931 * [The `build.target` configuration value sets the target platform,
7932 like `--target`][1.8ct].
7937 * [Unstable compiler flags have been further restricted][1.8u]. Since
7938 1.0 `-Z` flags have been considered unstable, and other flags that
7939 were considered unstable additionally required passing `-Z
7940 unstable-options` to access. Unlike unstable language and library
7941 features though, these options have been accessible on the stable
7942 release channel. Going forward, *new unstable flags will not be
7943 available on the stable release channel*, and old unstable flags
7944 will warn about their usage. In the future, all unstable flags will
7945 be unavailable on the stable release channel.
7946 * [It is no longer possible to `match` on empty enum variants using
7947 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7948 * The Unix-specific `MetadataExt` traits, including
7949 `os::unix::fs::MetadataExt`, which expose values such as inode
7950 numbers [no longer return platform-specific types][1.8r], but
7951 instead return widened integers. [RFC 1415].
7952 * [Modules sourced from the filesystem cannot appear within arbitrary
7953 blocks, but only within other modules][1.8mf].
7954 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7955 * On Unix, [stack overflow triggers a runtime abort instead of a
7957 * [`Command::spawn` and its equivalents return an error if any of
7958 its command-line arguments contain interior `NUL`s][1.8n].
7959 * [Tuple and unit enum variants from other crates are in the type
7961 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7962 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7963 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7964 instead of `foo.lib`.
7967 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7968 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7969 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7970 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7971 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7972 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7973 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7974 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7975 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7976 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7977 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7978 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
7979 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7980 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7981 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7982 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7983 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7984 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7985 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7986 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7987 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7988 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7989 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7990 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7991 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7992 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7993 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7994 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7995 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7996 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7997 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7998 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7999 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8000 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8001 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8002 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8003 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8004 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8005 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8006 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8007 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8008 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8009 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8010 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8011 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8012 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8013 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8014 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8015 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8016 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8017 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8018 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8019 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8020 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8021 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8022 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8023 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8024 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8025 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8026 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8029 Version 1.7.0 (2016-03-03)
8030 ==========================
8037 * [`Path::strip_prefix`] (renamed from relative_from)
8038 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8040 * [`Ipv4Addr::is_loopback`]
8041 * [`Ipv4Addr::is_private`]
8042 * [`Ipv4Addr::is_link_local`]
8043 * [`Ipv4Addr::is_multicast`]
8044 * [`Ipv4Addr::is_broadcast`]
8045 * [`Ipv4Addr::is_documentation`]
8047 * [`Ipv6Addr::is_unspecified`]
8048 * [`Ipv6Addr::is_loopback`]
8049 * [`Ipv6Addr::is_multicast`]
8052 * [`Vec::as_mut_slice`]
8054 * [`String::as_str`]
8055 * [`String::as_mut_str`]
8057 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8059 * `<[T]>::`[`sort_by_key`]
8060 * checked, saturated, and overflowing operations
8061 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8062 * [`i32::saturating_mul`]
8063 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8064 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8065 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8066 * [`u32::saturating_mul`]
8067 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8068 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8069 * and checked, saturated, and overflowing operations for other primitive types
8071 * [`ffi::IntoStringError`]
8072 * [`CString::into_string`]
8073 * [`CString::into_bytes`]
8074 * [`CString::into_bytes_with_nul`]
8075 * `From<CString> for Vec<u8>`
8077 * [`IntoStringError::into_cstring`]
8078 * [`IntoStringError::utf8_error`]
8079 * `Error for IntoStringError`
8081 * [`std::hash::BuildHasher`]
8082 * [`BuildHasher::Hasher`]
8083 * [`BuildHasher::build_hasher`]
8084 * [`std::hash::BuildHasherDefault`]
8085 * [`HashMap::with_hasher`]
8086 * [`HashMap::with_capacity_and_hasher`]
8087 * [`HashSet::with_hasher`]
8088 * [`HashSet::with_capacity_and_hasher`]
8089 * [`std::collections::hash_map::RandomState`]
8090 * [`RandomState::new`]
8091 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8092 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8093 from bytes is faster.
8094 * [The performance of `LineWriter` (and thus `io::stdout`) was
8095 improved by using `memchr` to search for newlines][1.7m].
8096 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8097 `f64` variants were stabilized previously.
8098 * [`BTreeMap` was rewritten to use less memory and improve the performance
8099 of insertion and iteration, the latter by as much as 5x][1.7bm].
8100 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8101 covariant over their contained type][1.7bt].
8102 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8103 over their contained type][1.7ll].
8104 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8106 * [`Any` is implemented for unsized types][1.7a].
8107 * [`Hash` is implemented for `Duration`][1.7h].
8112 * [When running tests with `--test`, rustdoc will pass `--cfg`
8113 arguments to the compiler][1.7dt].
8114 * [The compiler is built with RPATH information by default][1.7rpa].
8115 This means that it will be possible to run `rustc` when installed in
8116 unusual configurations without configuring the dynamic linker search
8118 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8119 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8120 over `LD_LIBRARY_PATH`.
8125 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8126 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8127 * [The `rerun-if-changed` build script directive no longer causes the
8128 build script to incorrectly run twice in certain scenarios][1.7rr].
8133 * Soundness fixes to the interactions between associated types and
8134 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8135 code that violates the new rules. This is a significant change that
8136 is known to break existing code, so it has emitted warnings for the
8137 new error cases since 1.4 to give crate authors time to adapt. The
8138 details of what is changing are subtle; read the RFC for more.
8139 * [Several bugs in the compiler's visibility calculations were
8140 fixed][1.7v]. Since this was found to break significant amounts of
8141 code, the new errors will be emitted as warnings for several release
8142 cycles, under the `private_in_public` lint.
8143 * Defaulted type parameters were accidentally accepted in positions
8144 that were not intended. In this release, [defaulted type parameters
8145 appearing outside of type definitions will generate a
8146 warning][1.7d], which will become an error in future releases.
8147 * [Parsing "." as a float results in an error instead of 0][1.7p].
8148 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8149 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8151 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8152 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8153 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8154 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8155 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8156 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8157 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8158 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8159 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8160 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8161 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8162 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8163 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8164 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8165 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8166 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8167 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8168 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8169 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8170 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8171 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8172 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8173 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8174 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8175 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8176 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8177 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8178 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8179 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8180 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8181 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8182 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8183 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8184 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8185 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8186 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8187 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8188 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8189 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8190 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8191 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8192 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8193 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8194 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8195 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8196 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8197 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8198 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8199 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8200 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8201 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8202 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8203 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8204 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8205 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8206 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8207 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8208 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8209 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8210 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8211 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8212 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8213 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8214 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8215 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8216 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8217 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8218 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8219 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8220 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8221 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8222 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8223 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8224 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8225 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8226 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8227 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8228 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8229 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8232 Version 1.6.0 (2016-01-21)
8233 ==========================
8238 * The `#![no_std]` attribute causes a crate to not be linked to the
8239 standard library, but only the [core library][1.6co], as described
8240 in [RFC 1184]. The core library defines common types and traits but
8241 has no platform dependencies whatsoever, and is the basis for Rust
8242 software in environments that cannot support a full port of the
8243 standard library, such as operating systems. Most of the core
8244 library is now stable.
8250 [`Read::read_exact`],
8251 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8252 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8253 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8254 [`os::unix::fs::DirBuilderExt`],
8255 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8256 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8257 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8258 [`collections::hash_map::Drain`],
8259 [`collections::hash_map::HashMap::drain`],
8260 [`collections::hash_set::Drain`],
8261 [`collections::hash_set::HashSet::drain`],
8262 [`collections::binary_heap::Drain`],
8263 [`collections::binary_heap::BinaryHeap::drain`],
8264 [`Vec::extend_from_slice`] (renamed from `push_all`),
8265 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8266 [`RwLock::into_inner`],
8267 [`Iterator::min_by_key`] (renamed from `min_by`),
8268 [`Iterator::max_by_key`] (renamed from `max_by`).
8269 * The [core library][1.6co] is stable, as are most of its APIs.
8270 * [The `assert_eq!` macro supports arguments that don't implement
8271 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8273 * Several timer functions that take duration in milliseconds [are
8274 deprecated in favor of those that take `Duration`][1.6ms]. These
8275 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8276 `thread::park_timeout_ms`.
8277 * The algorithm by which `Vec` reserves additional elements was
8278 [tweaked to not allocate excessive space][1.6a] while still growing
8280 * `From` conversions are [implemented from integers to floats][1.6f]
8281 in cases where the conversion is lossless. Thus they are not
8282 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8283 or `f64`. They are also not implemented for `isize` and `usize`
8284 because the implementations would be platform-specific. `From` is
8285 also implemented from `f32` to `f64`.
8286 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8287 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8288 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8289 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8291 * Sorting slices that are already sorted [is 50% faster in some
8297 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8298 * Cargo build scripts can specify their dependencies by emitting the
8299 [`rerun-if-changed`][1.6rr] key.
8300 * crates.io will reject publication of crates with dependencies that
8301 have a wildcard version constraint. Crates with wildcard
8302 dependencies were seen to cause a variety of problems, as described
8303 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8305 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8306 release folder. A variety of artifacts that Cargo failed to clean
8307 are now correctly deleted.
8312 * The `unreachable_code` lint [warns when a function call's argument
8314 * The parser indicates [failures that may be caused by
8315 confusingly-similar Unicode characters][1.6uc]
8316 * Certain macro errors [are reported at definition time][1.6m], not
8322 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8323 environment variable when locating crates. This was a pre-cargo
8324 feature for integrating with the package manager that was
8325 accidentally never removed.
8326 * [A number of bugs were fixed in the privacy checker][1.6p] that
8327 could cause previously-accepted code to break.
8328 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8329 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8330 struct pattern syntax (`Foo(..)`) can no longer be used to match
8331 unit structs. This is a warning now, but will become an error in
8332 future releases. Patterns that share the same name as a const are
8334 * A bug was fixed that causes [rustc not to apply default type
8335 parameters][1.6xc] when resolving certain method implementations of
8336 traits defined in other crates.
8338 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8339 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8340 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8341 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8342 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8343 [1.6co]: http://doc.rust-lang.org/core/index.html
8344 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8345 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8346 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8347 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8348 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8349 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8350 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8351 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8352 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8353 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8354 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8355 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8356 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8357 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8358 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8359 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8360 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8361 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8362 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8363 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8364 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8365 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8366 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8367 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8368 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8369 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8370 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8371 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8372 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8373 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8374 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8375 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8376 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8377 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8378 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8379 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8380 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8381 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8382 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8383 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8384 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8387 Version 1.5.0 (2015-12-10)
8388 ==========================
8390 * ~700 changes, numerous bugfixes
8396 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8397 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8398 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8399 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8400 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8401 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8402 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8403 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8404 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8405 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8406 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8407 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8408 [`Path::read_link`], [`Path::symlink_metadata`],
8409 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8410 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8411 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8412 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8413 [`slice::split_first_mut`], [`slice::split_first`],
8414 [`slice::split_last_mut`], [`slice::split_last`],
8415 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8416 [`str::MatchIndices`], [`str::RMatchIndices`],
8417 [`str::match_indices`], [`str::rmatch_indices`],
8418 [`str::slice_mut_unchecked`], [`string::ParseError`].
8419 * Rust applications hosted on crates.io can be installed locally to
8420 `~/.cargo/bin` with the [`cargo install`] command. Among other
8421 things this makes it easier to augment Cargo with new subcommands:
8422 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8423 invoked as `cargo foo`.
8424 * Crates with wildcard (`*`) dependencies will [emit warnings when
8425 published][1.5w]. In 1.6 it will no longer be possible to publish
8426 crates with wildcard dependencies.
8431 * The rules determining when a particular lifetime must outlive
8432 a particular value (known as '[dropck]') have been [modified
8433 to not rely on parametricity][1.5p].
8434 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8435 and `Arc`][1.5a]. Because these smart pointer types implement
8436 `Deref`, this causes breakage in cases where the interior type
8437 contains methods of the same name.
8438 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8439 that they could drop their content. Soundness fix.
8440 * All method invocations are [properly checked][1.5wf1] for
8441 [well-formedness][1.5wf2]. Soundness fix.
8442 * Traits whose supertraits contain `Self` are [not object
8443 safe][1.5o]. Soundness fix.
8444 * Target specifications support a [`no_default_libraries`][1.5nd]
8445 setting that controls whether `-nodefaultlibs` is passed to the
8446 linker, and in turn the `is_like_windows` setting no longer affects
8447 the `-nodefaultlibs` flag.
8448 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8449 * The `#[inline]` and `#[repr]` attributes [can only appear
8450 in valid locations][1.5at].
8451 * Native libraries linked from the local crate are [passed to
8452 the linker before native libraries from upstream crates][1.5nl].
8453 * Two rarely-used attributes, `#[no_debug]` and
8454 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8455 * Negation of unsigned integers, which has been a warning for
8456 several releases, [is now behind a feature gate and will
8457 generate errors][1.5nu].
8458 * The parser accidentally accepted visibility modifiers on
8459 enum variants, a bug [which has been fixed][1.5ev].
8460 * [A bug was fixed that allowed `use` statements to import unstable
8466 * When evaluating expressions at compile-time that are not
8467 compile-time constants (const-evaluating expressions in non-const
8468 contexts), incorrect code such as overlong bitshifts and arithmetic
8469 overflow will [generate a warning instead of an error][1.5ce],
8470 delaying the error until runtime. This will allow the
8471 const-evaluator to be expanded in the future backwards-compatibly.
8472 * The `improper_ctypes` lint [no longer warns about using `isize` and
8473 `usize` in FFI][1.5ict].
8478 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8480 * `Default` is [implemented for mutable slices][1.5d].
8481 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8482 * There are now `From` conversions [between floating point
8483 types][1.5f] where the conversions are lossless.
8484 * There are now `From` conversions [between integer types][1.5i] where
8485 the conversions are lossless.
8486 * [`fs::Metadata` implements `Clone`][1.5fs].
8487 * The `parse` method [accepts a leading "+" when parsing
8489 * [`AsMut` is implemented for `Vec`][1.5am].
8490 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8491 been optimized][1.5cf] and no longer rely on the default impl.
8492 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8493 `unsafe extern "C"` function types now [implement `Clone`,
8494 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8495 `fmt::Debug` for up to 12 arguments][1.5fp].
8496 * [Dropping `Vec`s is much faster in unoptimized builds when the
8497 element types don't implement `Drop`][1.5dv].
8498 * A bug that caused in incorrect behavior when [combining `VecDeque`
8499 with zero-sized types][1.5vdz] was resolved.
8500 * [`PartialOrd` for slices is faster][1.5po].
8505 * [Crate metadata size was reduced by 20%][1.5md].
8506 * [Improvements to code generation reduced the size of libcore by 3.3
8507 MB and rustc's memory usage by 18MB][1.5m].
8508 * [Improvements to deref translation increased performance in
8509 unoptimized builds][1.5dr].
8510 * Various errors in trait resolution [are deduplicated to only be
8511 reported once][1.5te].
8512 * Rust has preliminary [support for rumprun kernels][1.5rr].
8513 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8515 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8516 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8517 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8518 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8519 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8520 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8521 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8522 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8523 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8524 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8525 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8526 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8527 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8528 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8529 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8530 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8531 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8532 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8533 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8534 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8535 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8536 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8537 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8538 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8539 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8540 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8541 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8542 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8543 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8544 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8545 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8546 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8547 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8548 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8549 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8550 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8551 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8552 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8553 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8554 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8555 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8556 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8557 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8558 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8559 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8560 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8561 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8562 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8563 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8564 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8565 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8566 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8567 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8568 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8569 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8570 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8571 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8572 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8573 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8574 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8575 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8576 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8577 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8578 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8579 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8580 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8581 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8582 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8583 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8584 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8585 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8586 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8587 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8588 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8589 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8590 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8591 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8592 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8593 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8594 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8595 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8596 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8597 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8598 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8599 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8600 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8601 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8602 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8603 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8605 Version 1.4.0 (2015-10-29)
8606 ==========================
8608 * ~1200 changes, numerous bugfixes
8613 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8614 GNU) are now supported and recommended for use.
8619 * [Several changes have been made to fix type soundness and improve
8620 the behavior of associated types][sound]. See [RFC 1214]. Although
8621 we have mostly introduced these changes as warnings this release, to
8622 become errors next release, there are still some scenarios that will
8623 see immediate breakage.
8624 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8625 line breaks in addition to `\n`][crlf].
8626 * [Loans of `'static` lifetime extend to the end of a function][stat].
8627 * [`str::parse` no longer introduces avoidable rounding error when
8628 parsing floating point numbers. Together with earlier changes to
8629 float formatting/output, "round trips" like f.to_string().parse()
8630 now preserve the value of f exactly. Additionally, leading plus
8631 signs are now accepted][fp3].
8637 * `use` statements that import multiple items [can now rename
8638 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8639 * [Binops work correctly on fat pointers][binfat].
8640 * `pub extern crate`, which does not behave as expected, [issues a
8641 warning][pec] until a better solution is found.
8646 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8647 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8648 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8649 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8650 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8651 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8652 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8653 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8654 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8655 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8656 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8657 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8658 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8659 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8660 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8661 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8662 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8663 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8665 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8666 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8667 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8668 `f64::from_str_radix`.
8669 * [Reverse-searching strings is faster with the 'two-way'
8671 * [`std::io::copy` allows `?Sized` arguments][cc].
8672 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8673 [override `count`, `nth` and `last` with an *O*(1)
8674 implementation][it].
8675 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8676 * [`IntoRawFd` has been added to the Unix-specific prelude,
8677 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8679 * [`Extend<String>` and `FromIterator<String` are both implemented for
8681 * [`IntoIterator` is implemented for references to `Option` and
8683 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8684 Copy`][ext] as part of [RFC 839]. This will cause type inference
8685 breakage in rare situations.
8686 * [`BinaryHeap` implements `Debug`][bh2].
8687 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8689 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8690 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8691 * [String comparison is faster][faststr].
8692 * `&mut T` where `T: std::fmt::Write` [also implements
8693 `std::fmt::Write`][mutw].
8694 * [A stable regression in `VecDeque::push_back` and other
8695 capacity-altering methods that caused panics for zero-sized types
8697 * [Function pointers implement traits for up to 12 parameters][fp2].
8702 * The compiler [no longer uses the 'morestack' feature to prevent
8703 stack overflow][mm]. Instead it uses guard pages and stack
8704 probes (though stack probes are not yet implemented on any platform
8706 * [The compiler matches traits faster when projections are involved][p].
8707 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8709 * [Cargo now displays useful information about what its doing during
8710 `cargo update`][cu].
8712 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8713 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8714 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8715 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8716 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8717 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8718 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8719 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8720 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8721 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8722 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8723 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8724 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8725 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8726 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8727 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8728 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8729 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8730 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8731 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8732 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8733 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8734 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8735 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8736 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8737 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8738 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8739 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8740 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8741 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8742 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8743 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8744 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8745 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8746 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8747 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8748 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8749 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8750 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8751 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8752 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8753 [bh2]: https://github.com/rust-lang/rust/pull/28156
8754 [binfat]: https://github.com/rust-lang/rust/pull/28270
8755 [bm]: https://github.com/rust-lang/rust/pull/28197
8756 [cc]: https://github.com/rust-lang/rust/pull/27531
8757 [crlf]: https://github.com/rust-lang/rust/pull/28034
8758 [cu]: https://github.com/rust-lang/cargo/pull/1931
8759 [d]: https://github.com/rust-lang/rust/pull/27825
8760 [dep]: https://github.com/rust-lang/rust/pull/28339
8761 [es]: https://github.com/rust-lang/rust/pull/27956
8762 [ext]: https://github.com/rust-lang/rust/pull/28094
8763 [faststr]: https://github.com/rust-lang/rust/pull/28338
8764 [ffi]: https://github.com/rust-lang/rust/pull/28779
8765 [fp]: https://github.com/rust-lang/rust/pull/28268
8766 [fp2]: https://github.com/rust-lang/rust/pull/28560
8767 [fp3]: https://github.com/rust-lang/rust/pull/27307
8768 [i]: https://github.com/rust-lang/rust/pull/27451
8769 [into2]: https://github.com/rust-lang/rust/pull/28039
8770 [it]: https://github.com/rust-lang/rust/pull/27652
8771 [mm]: https://github.com/rust-lang/rust/pull/27338
8772 [mutw]: https://github.com/rust-lang/rust/pull/28368
8773 [sound]: https://github.com/rust-lang/rust/pull/27641
8774 [p]: https://github.com/rust-lang/rust/pull/27866
8775 [pec]: https://github.com/rust-lang/rust/pull/28486
8776 [pr]: https://github.com/rust-lang/rust/pull/27896
8777 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8778 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8779 [s]: https://github.com/rust-lang/rust/pull/27474
8780 [stab]: https://github.com/rust-lang/rust/pull/28339
8781 [stat]: https://github.com/rust-lang/rust/pull/28321
8782 [vd]: https://github.com/rust-lang/rust/pull/28494
8784 Version 1.3.0 (2015-09-17)
8785 ==============================
8787 * ~900 changes, numerous bugfixes
8792 * The [new object lifetime defaults][nold] have been [turned
8793 on][nold2] after a cycle of warnings about the change. Now types
8794 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8795 being interpreted as `&'a Box<Trait+'a>` to `&'a
8796 Box<Trait+'static>`.
8797 * [The Rustonomicon][nom] is a new book in the official documentation
8798 that dives into writing unsafe Rust.
8799 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8800 timekeeping is employed by other std APIs, as well as out-of-tree
8806 * The [new object lifetime defaults][nold] have been [turned
8807 on][nold2] after a cycle of warnings about the change.
8808 * There is a known [regression][lr] in how object lifetime elision is
8809 interpreted, the proper solution for which is undetermined.
8810 * The `#[prelude_import]` attribute, an internal implementation
8811 detail, was accidentally stabilized previously. [It has been put
8812 behind the `prelude_import` feature gate][pi]. This change is
8813 believed to break no existing code.
8814 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8815 [more sane for dynamically sized types][dst3]. Code that relied on
8816 the previous behavior is thought to be broken.
8817 * The `dropck` rules, which checks that destructors can't access
8818 destroyed values, [have been updated][dropck] to match the
8819 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8820 cause some previously-compiling code to no longer build.
8825 * The [new object lifetime defaults][nold] have been [turned
8826 on][nold2] after a cycle of warnings about the change.
8827 * Semicolons may [now follow types and paths in
8828 macros](https://github.com/rust-lang/rust/pull/27000).
8829 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8830 [more sane for dynamically sized types][dst3]. Code that relied on
8831 the previous behavior is not known to exist, and suspected to be
8833 * `'static` variables [may now be recursive][st].
8834 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8835 implementations correctly.
8836 * The `dropck` rules, which checks that destructors can't access
8837 destroyed values, [have been updated][dropck] to match the
8843 * The [`Duration`] API, [has been stabilized][ds], as well as the
8844 `std::time` module, which presently contains only `Duration`.
8845 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8846 * The owned C string, [`CString`], implements [`Borrow`] and the
8847 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8848 these allow C strings to be borrowed and cloned in generic code.
8849 * [`CStr`] implements [`Debug`].
8850 * [`AtomicPtr`] implements [`Debug`].
8851 * [`Error`] trait objects [can be downcast to their concrete types][e]
8852 in many common configurations, using the [`is`], [`downcast`],
8853 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8855 * Searching for substrings now [employs the two-way algorithm][search]
8856 instead of doing a naive search. This gives major speedups to a
8857 number of methods, including [`contains`][sc], [`find`][sf],
8858 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8859 [`ends_with`][sew] are also faster.
8860 * The performance of `PartialEq` for slices is [much faster][ps].
8861 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8862 is overridden and optimized by the implementations for scalars.
8863 * The [`Hasher`] trait now has a number of specialized `write_*`
8864 methods for primitive types, for efficiency.
8865 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8866 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8867 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8868 of [`std::error::Error::cause`][iec] also delegates to the inner
8870 * [`process::Child`][pc] gained the [`id`] method, which returns a
8871 `u32` representing the platform-specific process identifier.
8872 * The [`connect`] method on slices is deprecated, replaced by the new
8873 [`join`] method (note that both of these are on the *unstable*
8874 [`SliceConcatExt`] trait, but through the magic of the prelude are
8875 available to stable code anyway).
8876 * The [`Div`] operator is implemented for [`Wrapping`] types.
8877 * [`DerefMut` is implemented for `String`][dms].
8878 * Performance of SipHash (the default hasher for `HashMap`) is
8879 [better for long data][sh].
8880 * [`AtomicPtr`] implements [`Send`].
8881 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8882 are now [specialized to use uninitialized buffers for increased
8884 * Lifetime parameters of foreign functions [are now resolved
8890 * Rust can now, with some coercion, [produce programs that run on
8891 Windows XP][xp], though XP is not considered a supported platform.
8892 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8893 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8894 recommended for use in 1.3, though should be fully-functional
8895 in the [64-bit 1.4 beta][b14].
8896 * On Fedora-based systems installation will [properly configure the
8897 dynamic linker][fl].
8898 * The compiler gained many new extended error descriptions, which can
8899 be accessed with the `--explain` flag.
8900 * The `dropck` pass, which checks that destructors can't access
8901 destroyed values, [has been rewritten][27261]. This fixes some
8902 soundness holes, and as such will cause some previously-compiling
8903 code to no longer build.
8904 * `rustc` now uses [LLVM to write archive files where possible][ar].
8905 Eventually this will eliminate the compiler's dependency on the ar
8907 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
8908 supported FreeBSD on x86_64).
8909 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8910 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8912 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8913 will kill the process instead of leaking][nlp].
8915 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8916 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8917 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8918 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8919 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8920 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8921 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8922 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8923 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8924 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8925 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8926 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8927 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8928 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8929 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8930 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8931 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8932 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8933 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8934 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8935 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8936 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8937 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8938 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8939 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8940 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8941 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8942 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8943 [ar]: https://github.com/rust-lang/rust/pull/26926
8944 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8945 [dms]: https://github.com/rust-lang/rust/pull/26241
8946 [27261]: https://github.com/rust-lang/rust/pull/27261
8947 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8948 [ds]: https://github.com/rust-lang/rust/pull/26818
8949 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8950 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8951 [dst3]: https://github.com/rust-lang/rust/pull/27351
8952 [e]: https://github.com/rust-lang/rust/pull/24793
8953 [f]: https://github.com/rust-lang/rust/pull/26588
8954 [26959]: https://github.com/rust-lang/rust/pull/26959
8955 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8956 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8957 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8958 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8959 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8960 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8961 [lic]: https://github.com/rust-lang/rust/pull/26583
8962 [lnu]: https://github.com/rust-lang/rust/pull/27026
8963 [lr]: https://github.com/rust-lang/rust/issues/27248
8964 [lum]: https://github.com/rust-lang/rust/pull/26378
8965 [lur]: https://github.com/rust-lang/rust/pull/26783
8966 [nlp]: https://github.com/rust-lang/rust/pull/27176
8967 [nold2]: https://github.com/rust-lang/rust/pull/27045
8968 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8969 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8970 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8971 [pi]: https://github.com/rust-lang/rust/pull/26699
8972 [ps]: https://github.com/rust-lang/rust/pull/26884
8973 [rte]: https://github.com/rust-lang/rust/pull/26950
8974 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8975 [search]: https://github.com/rust-lang/rust/pull/26327
8976 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8977 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8978 [sh]: https://github.com/rust-lang/rust/pull/27280
8979 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8980 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8981 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8982 [st]: https://github.com/rust-lang/rust/pull/26630
8983 [win1]: https://github.com/rust-lang/rust/pull/26569
8984 [win2]: https://github.com/rust-lang/rust/pull/26741
8985 [win3]: https://github.com/rust-lang/rust/pull/26741
8986 [win4]: https://github.com/rust-lang/rust/pull/27210
8987 [xp]: https://github.com/rust-lang/rust/pull/26569
8989 Version 1.2.0 (2015-08-07)
8990 ==========================
8992 * ~1200 changes, numerous bugfixes
8997 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8998 like `Rc` to contain types without a fixed size, arrays and trait
8999 objects, finally enabling use of `Rc<[T]>` and completing the
9000 implementation of DST.
9001 * [Parallel codegen][parcodegen] is now working again, which can
9002 substantially speed up large builds in debug mode; It also gets
9003 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9004 jobs). It's not enabled by default, but will be "in the near
9005 future". It can be activated with the `-C codegen-units=N` flag to
9007 * This is the first release with [experimental support for linking
9008 with the MSVC linker and lib C on Windows (instead of using the GNU
9009 variants via MinGW)][win]. It is yet recommended only for the most
9010 intrepid Rustaceans.
9011 * Benchmark compilations are showing a 30% improvement in
9012 bootstrapping over 1.1.
9017 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9018 unicode case mapping, which is a previously-planned change in
9019 behavior and considered a bugfix.
9020 * [`mem::align_of`] now specifies [the *minimum alignment* for
9021 T][align], which is usually the alignment programs are interested
9022 in, and the same value reported by clang's
9023 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9025 * [The `#[packed]` attribute is no longer silently accepted by the
9026 compiler][packed]. This attribute did nothing and code that
9027 mentioned it likely did not work as intended.
9028 * Associated type defaults are [now behind the
9029 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9030 defaults *did not work*, but could be mentioned syntactically. As
9031 such this breakage has minimal impact.
9036 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9037 matching against dereferenceable values.
9042 * The [`Extend`] trait, which grows a collection from an iterator, is
9043 implemented over iterators of references, for `String`, `Vec`,
9044 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9045 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9046 * The [`iter::once`] function returns an iterator that yields a single
9047 element, and [`iter::empty`] returns an iterator that yields no
9049 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9050 over substring matches.
9051 * [`Cell`] and [`RefCell`] both implement `Eq`.
9052 * A number of methods for wrapping arithmetic are added to the
9053 integral types, [`wrapping_div`], [`wrapping_rem`],
9054 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9055 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9056 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9057 type.. It is illegal for the default arithmetic operations in Rust
9058 to overflow; the desire to wrap must be explicit.
9059 * The `{:#?}` formatting specifier [displays the alternate,
9060 pretty-printed][debugfmt] form of the `Debug` formatter. This
9061 feature was actually introduced prior to 1.0 with little
9063 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9064 for writing data to formatted strings, similar to [`io::Write`].
9065 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9066 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9067 are used by code generators to emit implementations of [`Debug`].
9068 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9069 methods that convert case, following Unicode case mapping.
9070 * It is now easier to handle poisoned locks. The [`PoisonError`]
9071 type, returned by failing lock operations, exposes `into_inner`,
9072 `get_ref`, and `get_mut`, which all give access to the inner lock
9073 guard, and allow the poisoned lock to continue to operate. The
9074 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9075 poisoned lock without attempting to take the lock.
9076 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9077 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9078 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9079 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9081 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9087 * `rustc` employs smarter heuristics for guessing at [typos].
9088 * `rustc` emits more efficient code for [no-op conversions between
9089 unsafe pointers][nop].
9090 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9091 resulting in faster compile times and smaller code.
9093 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9094 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9095 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9096 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9097 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9098 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9099 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9100 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9101 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9102 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9103 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9104 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9105 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9106 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9107 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9108 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9109 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9110 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9111 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9112 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9113 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9114 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9115 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9116 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9117 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9118 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9119 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9120 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9121 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9122 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9123 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9124 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9125 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9126 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9127 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9128 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9129 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9130 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9131 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9132 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9133 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9134 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9135 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9136 [align]: https://github.com/rust-lang/rust/pull/25646
9137 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9138 [typos]: https://github.com/rust-lang/rust/pull/26087
9139 [nop]: https://github.com/rust-lang/rust/pull/26336
9140 [fat]: https://github.com/rust-lang/rust/pull/26411
9141 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9142 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9143 [packed]: https://github.com/rust-lang/rust/pull/25541
9144 [ad]: https://github.com/rust-lang/rust/pull/27382
9145 [win]: https://github.com/rust-lang/rust/pull/25350
9147 Version 1.1.0 (2015-06-25)
9148 =========================
9150 * ~850 changes, numerous bugfixes
9155 * The [`std::fs` module has been expanded][fs] to expand the set of
9156 functionality exposed:
9157 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9158 don't incur a syscall on some platforms.
9159 * A `symlink_metadata` function has been added.
9160 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9161 access to all underlying information.
9162 * The compiler now contains extended explanations of many errors. When an error
9163 with an explanation occurs the compiler suggests using the `--explain` flag
9164 to read the explanation. Error explanations are also [available online][err-index].
9165 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9166 well as other work, the time to bootstrap the compiler decreased by
9172 * The [`str::split_whitespace`] method splits a string on unicode
9173 whitespace boundaries.
9174 * On both Windows and Unix, new extension traits provide conversion of
9175 I/O types to and from the underlying system handles. On Unix, these
9176 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9177 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9178 `TcpListener`, and `UpdSocket`. Further implementations for
9179 `std::process` will be stabilized later.
9180 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9181 Windows, symlinks can be created with
9182 `std::os::windows::symlink_dir` and
9183 `std::os::windows::symlink_file`.
9184 * The `mpsc::Receiver` type can now be converted into an iterator with
9185 `into_iter` on the [`IntoIterator`] trait.
9186 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9187 implementation of the [`From`] trait.
9188 * The `Debug` implementation for `RangeFull` [creates output that is
9189 more consistent with other implementations][rf].
9190 * [`Debug` is implemented for `File`][file].
9191 * The `Default` implementation for `Arc` [no longer requires `Sync +
9193 * [The `Iterator` methods `count`, `nth`, and `last` have been
9194 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9195 * Incorrect handling of paths on Windows has been improved in both the
9196 compiler and the standard library.
9197 * [`AtomicPtr` gained a `Default` implementation][ap].
9198 * In accordance with Rust's policy on arithmetic overflow `abs` now
9199 [panics on overflow when debug assertions are enabled][abs].
9200 * The [`Cloned`] iterator, which was accidentally left unstable for
9201 1.0 [has been stabilized][c].
9202 * The [`Incoming`] iterator, which iterates over incoming TCP
9203 connections, and which was accidentally unnamable in 1.0, [is now
9204 properly exported][inc].
9205 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9206 `sift_up` or `sift_down` panic][bh].
9207 * The [`split_off`] method of `LinkedList` [no longer corrupts
9208 the list in certain scenarios][ll].
9213 * Type checking performance [has improved notably][sk] with
9214 [multiple improvements][pre].
9215 * The compiler [suggests code changes][ch] for more errors.
9216 * rustc and it's build system have experimental support for [building
9217 toolchains against MUSL][m] instead of glibc on Linux.
9218 * The compiler defines the `target_env` cfg value, which is used for
9219 distinguishing toolchains that are otherwise for the same
9220 platform. Presently this is set to `gnu` for common GNU Linux
9221 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9222 * The [`cargo rustc`][crc] command invokes a build with custom flags
9224 * [Android executables are always position independent][pie].
9225 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9226 with `Drop`][24935].
9228 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9229 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9230 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9231 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9232 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9233 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9234 [rf]: https://github.com/rust-lang/rust/pull/24491
9235 [err-index]: https://doc.rust-lang.org/error-index.html
9236 [sk]: https://github.com/rust-lang/rust/pull/24615
9237 [pre]: https://github.com/rust-lang/rust/pull/25323
9238 [file]: https://github.com/rust-lang/rust/pull/24598
9239 [ch]: https://github.com/rust-lang/rust/pull/24683
9240 [arc]: https://github.com/rust-lang/rust/pull/24695
9241 [si]: https://github.com/rust-lang/rust/pull/24701
9242 [ap]: https://github.com/rust-lang/rust/pull/24834
9243 [m]: https://github.com/rust-lang/rust/pull/24777
9244 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9245 [crc]: https://github.com/rust-lang/cargo/pull/1568
9246 [pie]: https://github.com/rust-lang/rust/pull/24953
9247 [abs]: https://github.com/rust-lang/rust/pull/25441
9248 [c]: https://github.com/rust-lang/rust/pull/25496
9249 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9250 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9251 [inc]: https://github.com/rust-lang/rust/pull/25522
9252 [bh]: https://github.com/rust-lang/rust/pull/25856
9253 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9254 [ll]: https://github.com/rust-lang/rust/pull/26022
9255 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9256 [24935]: https://github.com/rust-lang/rust/pull/24935
9258 Version 1.0.0 (2015-05-15)
9259 ========================
9261 * ~1500 changes, numerous bugfixes
9266 * The vast majority of the standard library is now `#[stable]`. It is
9267 no longer possible to use unstable features with a stable build of
9269 * Many popular crates on [crates.io] now work on the stable release
9271 * Arithmetic on basic integer types now [checks for overflow in debug
9277 * Several [restrictions have been added to trait coherence][coh] in
9278 order to make it easier for upstream authors to change traits
9279 without breaking downstream code.
9280 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9281 improve error messages and macro behavior. For example, `0b1234` is
9282 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9283 * Trait bounds [are always invariant][inv], eliminating the need for
9284 the `PhantomFn` and `MarkerTrait` lang items, which have been
9286 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9287 "foo" as bar` syntax has been replaced with `extern crate foo as
9288 bar`, and Cargo now automatically translates "-" in *package* names
9289 to underscore for the crate name.
9290 * [Lifetime shadowing is an error][lt].
9291 * [`Send` no longer implies `'static`][send-rfc].
9292 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9293 `MyType::default()`.
9294 * Primitive types [now have inherent methods][prim-inherent],
9295 obviating the need for extension traits like `SliceExt`.
9296 * Methods with `Self: Sized` in their `where` clause are [considered
9297 object-safe][self-sized], allowing many extension traits like
9298 `IteratorExt` to be merged into the traits they extended.
9299 * You can now [refer to associated types][assoc-where] whose
9300 corresponding trait bounds appear only in a `where` clause.
9301 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9302 like `Send` and `Sync` are now library-defined.
9303 * A [Reflect trait][reflect] was introduced, which means that
9304 downcasting via the `Any` trait is effectively limited to concrete
9305 types. This helps retain the potentially-important "parametricity"
9306 property: generic code cannot behave differently for different type
9307 arguments except in minor ways.
9308 * The `unsafe_destructor` feature is now deprecated in favor of the
9309 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9315 * The `thread_local` module [has been renamed to `std::thread`][th].
9316 * The methods of `IteratorExt` [have been moved to the `Iterator`
9317 trait itself][23300].
9318 * Several traits that implement Rust's conventions for type
9319 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9320 [centralized in the `std::convert` module][con].
9321 * The `FromError` trait [was removed in favor of `From`][fe].
9322 * The basic sleep function [has moved to
9323 `std::thread::sleep_ms`][slp].
9324 * The `splitn` function now takes an `n` parameter that represents the
9325 number of items yielded by the returned iterator [instead of the
9326 number of 'splits'][spl].
9327 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9328 * [Derived implementations of `PartialOrd` now order enums according
9329 to their explicitly-assigned discriminants][po].
9330 * [Methods for searching strings are generic over `Pattern`s][pat],
9331 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9333 * [In method resolution, object methods are resolved before inherent
9335 * [`String::from_str` has been deprecated in favor of the `From` impl,
9336 `String::from`][24517].
9337 * [`io::Error` implements `Sync`][ios].
9338 * [The `words` method on `&str` has been replaced with
9339 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9341 * The new path and IO modules are complete and `#[stable]`. This
9342 was the major library focus for this cycle.
9343 * The path API was [revised][path-normalize] to normalize `.`,
9344 adjusting the tradeoffs in favor of the most common usage.
9345 * A large number of remaining APIs in `std` were also stabilized
9346 during this cycle; about 75% of the non-deprecated API surface
9348 * The new [string pattern API][string-pattern] landed, which makes
9349 the string slice API much more internally consistent and flexible.
9350 * A new set of [generic conversion traits][conversion] replaced
9351 many existing ad hoc traits.
9352 * Generic numeric traits were [completely removed][num-traits]. This
9353 was made possible thanks to inherent methods for primitive types,
9354 and the removal gives maximal flexibility for designing a numeric
9355 hierarchy in the future.
9356 * The `Fn` traits are now related via [inheritance][fn-inherit]
9357 and provide ergonomic [blanket implementations][fn-blanket].
9358 * The `Index` and `IndexMut` traits were changed to
9359 [take the index by value][index-value], enabling code like
9360 `hash_map["string"]` to work.
9361 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9362 `Copy` data is known to be `Clone` as well.
9367 * Many errors now have extended explanations that can be accessed with
9368 the `--explain` flag to `rustc`.
9369 * Many new examples have been added to the standard library
9371 * rustdoc has received a number of improvements focused on completion
9373 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9374 * Much headway was made on ecosystem-wide CI, making it possible
9375 to [compare builds for breakage][ci-compare].
9378 [crates.io]: http://crates.io
9379 [clo]: https://github.com/rust-lang/rust/pull/24034
9380 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9381 [con]: https://github.com/rust-lang/rust/pull/23875
9382 [cr]: https://github.com/rust-lang/rust/pull/23419
9383 [fe]: https://github.com/rust-lang/rust/pull/23879
9384 [23300]: https://github.com/rust-lang/rust/pull/23300
9385 [inv]: https://github.com/rust-lang/rust/pull/23938
9386 [ios]: https://github.com/rust-lang/rust/pull/24133
9387 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9388 [lt]: https://github.com/rust-lang/rust/pull/24057
9389 [meth]: https://github.com/rust-lang/rust/pull/24056
9390 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9391 [po]: https://github.com/rust-lang/rust/pull/24270
9392 [24517]: https://github.com/rust-lang/rust/pull/24517
9393 [slp]: https://github.com/rust-lang/rust/pull/23949
9394 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9395 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9396 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9397 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9398 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9399 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9400 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9401 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9402 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9403 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9404 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9405 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9406 [reflect]: https://github.com/rust-lang/rust/pull/23712
9407 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9408 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9409 [index-value]: https://github.com/rust-lang/rust/pull/23601
9410 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9411 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9412 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9413 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9414 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9415 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9418 Version 1.0.0-alpha.2 (2015-02-20)
9419 =====================================
9421 * ~1300 changes, numerous bugfixes
9425 * The various I/O modules were [overhauled][io-rfc] to reduce
9426 unnecessary abstractions and provide better interoperation with
9427 the underlying platform. The old `io` module remains temporarily
9429 * The standard library now [participates in feature gating][feat],
9430 so use of unstable libraries now requires a `#![feature(...)]`
9431 attribute. The impact of this change is [described on the
9432 forum][feat-forum]. [RFC][feat-rfc].
9436 * `for` loops [now operate on the `IntoIterator` trait][into],
9437 which eliminates the need to call `.iter()`, etc. to iterate
9438 over collections. There are some new subtleties to remember
9439 though regarding what sort of iterators various types yield, in
9440 particular that `for foo in bar { }` yields values from a move
9441 iterator, destroying the original collection. [RFC][into-rfc].
9442 * Objects now have [default lifetime bounds][obj], so you don't
9443 have to write `Box<Trait+'static>` when you don't care about
9444 storing references. [RFC][obj-rfc].
9445 * In types that implement `Drop`, [lifetimes must outlive the
9446 value][drop]. This will soon make it possible to safely
9447 implement `Drop` for types where `#[unsafe_destructor]` is now
9448 required. Read the [gorgeous RFC][drop-rfc] for details.
9449 * The fully qualified <T as Trait>::X syntax lets you set the Self
9450 type for a trait method or associated type. [RFC][ufcs-rfc].
9451 * References to types that implement `Deref<U>` now [automatically
9452 coerce to references][deref] to the dereferenced type `U`,
9453 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9454 should eliminate many unsightly uses of `&*`, as when converting
9455 from references to vectors into references to
9456 slices. [RFC][deref-rfc].
9457 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9458 `|:|`) is obsolete and closure kind is inferred from context.
9459 * [`Self` is a keyword][Self].
9463 * The `Show` and `String` formatting traits [have been
9464 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9465 their related purposes. Automatically getting a string
9466 conversion to use with `format!("{:?}", something_to_debug)` is
9467 now written `#[derive(Debug)]`.
9468 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9469 OsStr}`, provide strings in platform-specific encodings for easier
9470 interop with system APIs. [RFC][osstr-rfc].
9471 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9472 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9473 creating raw pointers.
9477 * Certain long error messages of the form 'expected foo found bar'
9478 are now [split neatly across multiple
9479 lines][multiline]. Examples in the PR.
9480 * On Unix Rust can be [uninstalled][un] by running
9481 `/usr/local/lib/rustlib/uninstall.sh`.
9482 * The `#[rustc_on_unimplemented]` attribute, requiring the
9483 'on_unimplemented' feature, lets rustc [display custom error
9484 messages when a trait is expected to be implemented for a type
9489 * Rust is tested against a [LALR grammar][lalr], which parses
9490 almost all the Rust files that rustc does.
9492 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9493 [close]: https://github.com/rust-lang/rust/pull/21843
9494 [deref]: https://github.com/rust-lang/rust/pull/21351
9495 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9496 [drop]: https://github.com/rust-lang/rust/pull/21972
9497 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9498 [feat]: https://github.com/rust-lang/rust/pull/21248
9499 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9500 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9501 [fmt]: https://github.com/rust-lang/rust/pull/21457
9502 [into]: https://github.com/rust-lang/rust/pull/20790
9503 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9504 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9505 [lalr]: https://github.com/rust-lang/rust/pull/21452
9506 [multiline]: https://github.com/rust-lang/rust/pull/19870
9507 [obj]: https://github.com/rust-lang/rust/pull/22230
9508 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9509 [onun]: https://github.com/rust-lang/rust/pull/20889
9510 [osstr]: https://github.com/rust-lang/rust/pull/21488
9511 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9512 [Self]: https://github.com/rust-lang/rust/pull/22158
9513 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9514 [un]: https://github.com/rust-lang/rust/pull/22256
9517 Version 1.0.0-alpha (2015-01-09)
9518 ==================================
9520 * ~2400 changes, numerous bugfixes
9524 * The language itself is considered feature complete for 1.0,
9525 though there will be many usability improvements and bugfixes
9526 before the final release.
9527 * Nearly 50% of the public API surface of the standard library has
9528 been declared 'stable'. Those interfaces are unlikely to change
9530 * The long-running debate over integer types has been
9531 [settled][ints]: Rust will ship with types named `isize` and
9532 `usize`, rather than `int` and `uint`, for pointer-sized
9533 integers. Guidelines will be rolled out during the alpha cycle.
9534 * Most crates that are not `std` have been moved out of the Rust
9535 distribution into the Cargo ecosystem so they can evolve
9536 separately and don't need to be stabilized as quickly, including
9537 'time', 'getopts', 'num', 'regex', and 'term'.
9538 * Documentation continues to be expanded with more API coverage, more
9539 examples, and more in-depth explanations. The guides have been
9540 consolidated into [The Rust Programming Language][trpl].
9541 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9542 * All official Rust binary installers now come with [Cargo], the
9543 Rust package manager.
9547 * Closures have been [completely redesigned][unboxed] to be
9548 implemented in terms of traits, can now be used as generic type
9549 bounds and thus monomorphized and inlined, or via an opaque
9550 pointer (boxed) as in the old system. The new system is often
9551 referred to as 'unboxed' closures.
9552 * Traits now support [associated types][assoc], allowing families
9553 of related types to be defined together and used generically in
9555 * Enum variants are [namespaced by their type names][enum].
9556 * [`where` clauses][where] provide a more versatile and attractive
9557 syntax for specifying generic bounds, though the previous syntax
9559 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9561 * Rust [no longer has a runtime][rt] of any description, and only
9562 supports OS threads, not green threads.
9563 * At long last, Rust has been overhauled for 'dynamically-sized
9564 types' ([DST]), which integrates 'fat pointers' (object types,
9565 arrays, and `str`) more deeply into the type system, making it
9567 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9568 `..j` that produce range types and which, when combined with the
9569 `Index` operator and multidispatch, leads to a convenient slice
9571 * The new range syntax revealed an ambiguity in the fixed-length
9572 array syntax, so now fixed length arrays [are written `[T;
9574 * The `Copy` trait is no longer implemented automatically. Unsafe
9575 pointers no longer implement `Sync` and `Send` so types
9576 containing them don't automatically either. `Sync` and `Send`
9577 are now 'unsafe traits' so one can "forcibly" implement them via
9578 `unsafe impl` if a type confirms to the requirements for them
9579 even though the internals do not (e.g. structs containing unsafe
9580 pointers like `Arc`). These changes are intended to prevent some
9581 footguns and are collectively known as [opt-in built-in
9582 traits][oibit] (though `Sync` and `Send` will soon become pure
9583 library types unknown to the compiler).
9584 * Operator traits now take their operands [by value][ops], and
9585 comparison traits can use multidispatch to compare one type
9586 against multiple other types, allowing e.g. `String` to be
9587 compared with `&str`.
9588 * `if let` and `while let` are no longer feature-gated.
9589 * Rust has adopted a more [uniform syntax for escaping unicode
9590 characters][unicode].
9591 * `macro_rules!` [has been declared stable][mac]. Though it is a
9592 flawed system it is sufficiently popular that it must be usable
9593 for 1.0. Effort has gone into [future-proofing][mac-future] it
9594 in ways that will allow other macro systems to be developed in
9595 parallel, and won't otherwise impact the evolution of the
9597 * The prelude has been [pared back significantly][prelude] such
9598 that it is the minimum necessary to support the most pervasive
9599 code patterns, and through [generalized where clauses][where]
9600 many of the prelude extension traits have been consolidated.
9601 * Rust's rudimentary reflection [has been removed][refl], as it
9602 incurred too much code generation for little benefit.
9603 * [Struct variants][structvars] are no longer feature-gated.
9604 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9605 known as 'higher-ranked trait bounds', this crucially allows
9606 unboxed closures to work.
9607 * Macros invocations surrounded by parens or square brackets and
9608 not terminated by a semicolon are [parsed as
9609 expressions][macros], which makes expressions like `vec![1i32,
9610 2, 3].len()` work as expected.
9611 * Trait objects now implement their traits automatically, and
9612 traits that can be coerced to objects now must be [object
9614 * Automatically deriving traits is now done with `#[derive(...)]`
9615 not `#[deriving(...)]` for [consistency with other naming
9616 conventions][derive].
9617 * Importing the containing module or enum at the same time as
9618 items or variants they contain is [now done with `self` instead
9619 of `mod`][self], as in use `foo::{self, bar}`
9620 * Glob imports are no longer feature-gated.
9621 * The `box` operator and `box` patterns have been feature-gated
9622 pending a redesign. For now unique boxes should be allocated
9623 like other containers, with `Box::new`.
9627 * A [series][coll1] of [efforts][coll2] to establish
9628 [conventions][coll3] for collections types has resulted in API
9629 improvements throughout the standard library.
9630 * New [APIs for error handling][err] provide ergonomic interop
9631 between error types, and [new conventions][err-conv] describe
9632 more clearly the recommended error handling strategies in Rust.
9633 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9634 it is easier to discuss failure in the context of error handling
9635 without making clarifications as to whether you are referring to
9636 the 'fail' macro or failure more generally.
9637 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9638 syscall when available.
9639 * The 'serialize' crate has been renamed 'rustc-serialize' and
9640 moved out of the distribution to Cargo. Although it is widely
9641 used now, it is expected to be superseded in the near future.
9642 * The `Show` formatter, typically implemented with
9643 `#[derive(Show)]` is [now requested with the `{:?}`
9644 specifier][show] and is intended for use by all types, for uses
9645 such as `println!` debugging. The new `String` formatter must be
9646 implemented by hand, uses the `{}` specifier, and is intended
9647 for full-fidelity conversions of things that can logically be
9648 represented as strings.
9652 * [Flexible target specification][flex] allows rustc's code
9653 generation to be configured to support otherwise-unsupported
9655 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9656 respective debuggers with Rust-appropriate pretty-printing.
9657 * The Windows installation of Rust is distributed with the
9658 MinGW components currently required to link binaries on that
9663 * Nullable enum optimizations have been extended to more types so
9664 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9665 space than the inner types themselves.
9666 * Work has begun on supporting AArch64.
9668 [Cargo]: https://crates.io
9669 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9670 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9671 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9672 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9673 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9674 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9675 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9676 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9677 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9678 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9679 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9680 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9681 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9682 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9683 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9684 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9685 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9686 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9687 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9688 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9689 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9690 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9691 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9692 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9693 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9694 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9695 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9696 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9697 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9698 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9699 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9700 [trpl]: https://doc.rust-lang.org/book/index.html
9701 [rbe]: http://rustbyexample.com/
9704 Version 0.12.0 (2014-10-09)
9705 =============================
9707 * ~1900 changes, numerous bugfixes
9711 * The introductory documentation (now called The Rust Guide) has
9712 been completely rewritten, as have a number of supplementary
9714 * Rust's package manager, Cargo, continues to improve and is
9715 sometimes considered to be quite awesome.
9716 * Many API's in `std` have been reviewed and updated for
9717 consistency with the in-development Rust coding
9718 guidelines. The standard library documentation tracks
9719 stabilization progress.
9720 * Minor libraries have been moved out-of-tree to the rust-lang org
9721 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9722 be installed with Cargo.
9723 * Lifetime elision allows lifetime annotations to be left off of
9724 function declarations in many common scenarios.
9725 * Rust now works on 64-bit Windows.
9728 * Indexing can be overloaded with the `Index` and `IndexMut`
9730 * The `if let` construct takes a branch only if the `let` pattern
9731 matches, currently behind the 'if_let' feature gate.
9732 * 'where clauses', a more flexible syntax for specifying trait
9733 bounds that is more aesthetic, have been added for traits and
9734 free functions. Where clauses will in the future make it
9735 possible to constrain associated types, which would be
9736 impossible with the existing syntax.
9737 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9738 the 'slicing_syntax' feature gate, and can be overloaded with
9739 the `Slice` or `SliceMut` traits.
9740 * The syntax for matching of sub-slices has been changed to use a
9741 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9742 consistency with other uses of `..` and to future-proof
9743 potential additional uses of the syntax.
9744 * The syntax for matching inclusive ranges in patterns has changed
9745 from `0..3` to `0...4` to be consistent with the exclusive range
9747 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9748 c]`) has been put behind the 'advanced_slice_patterns' feature
9749 gate and may be removed in the future.
9750 * Components of tuples and tuple structs can be extracted using
9751 the `value.0` syntax, currently behind the `tuple_indexing`
9753 * The `#[crate_id]` attribute is no longer supported; versioning
9754 is handled by the package manager.
9755 * Renaming crate imports are now written `extern crate foo as bar`
9756 instead of `extern crate bar = foo`.
9757 * Renaming use statements are now written `use foo as bar` instead
9759 * `let` and `match` bindings and argument names in macros are now
9761 * The new, more efficient, closure types ('unboxed closures') have
9762 been added under a feature gate, 'unboxed_closures'. These will
9763 soon replace the existing closure types, once higher-ranked
9764 trait lifetimes are added to the language.
9765 * `move` has been added as a keyword, for indicating closures
9766 that capture by value.
9767 * Mutation and assignment is no longer allowed in pattern guards.
9768 * Generic structs and enums can now have trait bounds.
9769 * The `Share` trait is now called `Sync` to free up the term
9770 'shared' to refer to 'shared reference' (the default reference
9772 * Dynamically-sized types have been mostly implemented,
9773 unifying the behavior of fat-pointer types with the rest of the
9775 * As part of dynamically-sized types, the `Sized` trait has been
9776 introduced, which qualifying types implement by default, and
9777 which type parameters expect by default. To specify that a type
9778 parameter does not need to be sized, write `<Sized? T>`. Most
9779 types are `Sized`, notable exceptions being unsized arrays
9780 (`[T]`) and trait types.
9781 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9782 * Lifetime bounds can now be applied to type parameters and object
9784 * The old, reference counted GC type, `Gc<T>` which was once
9785 denoted by the `@` sigil, has finally been removed. GC will be
9786 revisited in the future.
9789 * Library documentation has been improved for a number of modules.
9790 * Bit-vectors, collections::bitv has been modernized.
9791 * The url crate is deprecated in favor of
9792 http://github.com/servo/rust-url, which can be installed with
9794 * Most I/O stream types can be cloned and subsequently closed from
9796 * A `std::time::Duration` type has been added for use in I/O
9797 methods that rely on timers, as well as in the 'time' crate's
9798 `Timespec` arithmetic.
9799 * The runtime I/O abstraction layer that enabled the green thread
9800 scheduler to do non-thread-blocking I/O has been removed, along
9801 with the libuv-based implementation employed by the green thread
9802 scheduler. This will greatly simplify the future I/O work.
9803 * `collections::btree` has been rewritten to have a more
9804 idiomatic and efficient design.
9807 * rustdoc output now indicates the stability levels of API's.
9808 * The `--crate-name` flag can specify the name of the crate
9809 being compiled, like `#[crate_name]`.
9810 * The `-C metadata` specifies additional metadata to hash into
9811 symbol names, and `-C extra-filename` specifies additional
9812 information to put into the output filename, for use by the
9813 package manager for versioning.
9814 * debug info generation has continued to improve and should be
9815 more reliable under both gdb and lldb.
9816 * rustc has experimental support for compiling in parallel
9817 using the `-C codegen-units` flag.
9818 * rustc no longer encodes rpath information into binaries by
9822 * Stack usage has been optimized with LLVM lifetime annotations.
9823 * Official Rust binaries on Linux are more compatible with older
9824 kernels and distributions, built on CentOS 5.10.
9827 Version 0.11.0 (2014-07-02)
9828 ==========================
9830 * ~1700 changes, numerous bugfixes
9833 * ~[T] has been removed from the language. This type is superseded by
9835 * ~str has been removed from the language. This type is superseded by
9837 * ~T has been removed from the language. This type is superseded by the
9839 * @T has been removed from the language. This type is superseded by the
9840 standard library's std::gc::Gc<T> type.
9841 * Struct fields are now all private by default.
9842 * Vector indices and shift amounts are both required to be a `uint`
9843 instead of any integral type.
9844 * Byte character, byte string, and raw byte string literals are now all
9845 supported by prefixing the normal literal with a `b`.
9846 * Multiple ABIs are no longer allowed in an ABI string
9847 * The syntax for lifetimes on closures/procedures has been tweaked
9848 slightly: `<'a>|A, B|: 'b + K -> T`
9849 * Floating point modulus has been removed from the language; however it
9850 is still provided by a library implementation.
9851 * Private enum variants are now disallowed.
9852 * The `priv` keyword has been removed from the language.
9853 * A closure can no longer be invoked through a &-pointer.
9854 * The `use foo, bar, baz;` syntax has been removed from the language.
9855 * The transmute intrinsic no longer works on type parameters.
9856 * Statics now allow blocks/items in their definition.
9857 * Trait bounds are separated from objects with + instead of : now.
9858 * Objects can no longer be read while they are mutably borrowed.
9859 * The address of a static is now marked as insignificant unless the
9860 #[inline(never)] attribute is placed it.
9861 * The #[unsafe_destructor] attribute is now behind a feature gate.
9862 * Struct literals are no longer allowed in ambiguous positions such as
9863 if, while, match, and for..in.
9864 * Declaration of lang items and intrinsics are now feature-gated by
9866 * Integral literals no longer default to `int`, and floating point
9867 literals no longer default to `f64`. Literals must be suffixed with an
9868 appropriate type if inference cannot determine the type of the
9870 * The Box<T> type is no longer implicitly borrowed to &mut T.
9871 * Procedures are now required to not capture borrowed references.
9874 * The standard library is now a "facade" over a number of underlying
9875 libraries. This means that development on the standard library should
9876 be speedier due to smaller crates, as well as a clearer line between
9878 * A new library, libcore, lives under the standard library's facade
9879 which is Rust's "0-assumption" library, suitable for embedded and
9880 kernel development for example.
9881 * A regex crate has been added to the standard distribution. This crate
9882 includes statically compiled regular expressions.
9883 * The unwrap/unwrap_err methods on Result require a Show bound for
9884 better error messages.
9885 * The return types of the std::comm primitives have been centralized
9886 around the Result type.
9887 * A number of I/O primitives have gained the ability to time out their
9889 * A number of I/O primitives have gained the ability to close their
9890 reading/writing halves to cancel pending operations.
9891 * Reverse iterator methods have been removed in favor of `rev()` on
9892 their forward-iteration counterparts.
9893 * A bitflags! macro has been added to enable easy interop with C and
9894 management of bit flags.
9895 * A debug_assert! macro is now provided which is disabled when
9896 `--cfg ndebug` is passed to the compiler.
9897 * A graphviz crate has been added for creating .dot files.
9898 * The std::cast module has been migrated into std::mem.
9899 * The std::local_data api has been migrated from freestanding functions
9900 to being based on methods.
9901 * The Pod trait has been renamed to Copy.
9902 * jemalloc has been added as the default allocator for types.
9903 * The API for allocating memory has been changed to use proper alignment
9904 and sized deallocation
9905 * Connecting a TcpStream or binding a TcpListener is now based on a
9906 string address and a u16 port. This allows connecting to a hostname as
9908 * The Reader trait now contains a core method, read_at_least(), which
9909 correctly handles many repeated 0-length reads.
9910 * The process-spawning API is now centered around a builder-style
9912 * The :? printing qualifier has been moved from the standard library to
9913 an external libdebug crate.
9914 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9915 have been renamed to Eq/Ord.
9916 * The select/plural methods have been removed from format!. The escapes
9917 for { and } have also changed from \{ and \} to {{ and }},
9919 * The TaskBuilder API has been re-worked to be a true builder, and
9920 extension traits for spawning native/green tasks have been added.
9923 * All breaking changes to the language or libraries now have their
9924 commit message annotated with `[breaking-change]` to allow for easy
9925 discovery of breaking changes.
9926 * The compiler will now try to suggest how to annotate lifetimes if a
9927 lifetime-related error occurs.
9928 * Debug info continues to be improved greatly with general bug fixes and
9929 better support for situations like link time optimization (LTO).
9930 * Usage of syntax extensions when cross-compiling has been fixed.
9931 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9932 -fdata-sections and --gc-sections has been enabled by default
9933 * The compiler is now stricter about where it will load module files
9934 from when a module is declared via `mod foo;`.
9935 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9936 Syntax extensions are now discovered via a "plugin registrar" type
9937 which will be extended in the future to other various plugins.
9938 * Lints have been restructured to allow for dynamically loadable lints.
9939 * A number of rustdoc improvements:
9940 * The HTML output has been visually redesigned.
9941 * Markdown is now powered by hoedown instead of sundown.
9942 * Searching heuristics have been greatly improved.
9943 * The search index has been reduced in size by a great amount.
9944 * Cross-crate documentation via `pub use` has been greatly improved.
9945 * Primitive types are now hyperlinked and documented.
9946 * Documentation has been moved from static.rust-lang.org/doc to
9948 * A new sandbox, play.rust-lang.org, is available for running and
9949 sharing rust code examples on-line.
9950 * Unused attributes are now more robustly warned about.
9951 * The dead_code lint now warns about unused struct fields.
9952 * Cross-compiling to iOS is now supported.
9953 * Cross-compiling to mipsel is now supported.
9954 * Stability attributes are now inherited by default and no longer apply
9955 to intra-crate usage, only inter-crate usage.
9956 * Error message related to non-exhaustive match expressions have been
9960 Version 0.10 (2014-04-03)
9961 =========================
9963 * ~1500 changes, numerous bugfixes
9966 * A new RFC process is now in place for modifying the language.
9967 * Patterns with `@`-pointers have been removed from the language.
9968 * Patterns with unique vectors (`~[T]`) have been removed from the
9970 * Patterns with unique strings (`~str`) have been removed from the
9972 * `@str` has been removed from the language.
9973 * `@[T]` has been removed from the language.
9974 * `@self` has been removed from the language.
9975 * `@Trait` has been removed from the language.
9976 * Headers on `~` allocations which contain `@` boxes inside the type for
9977 reference counting have been removed.
9978 * The semantics around the lifetimes of temporary expressions have changed,
9979 see #3511 and #11585 for more information.
9980 * Cross-crate syntax extensions are now possible, but feature gated. See
9981 #11151 for more information. This includes both `macro_rules!` macros as
9982 well as syntax extensions such as `format!`.
9983 * New lint modes have been added, and older ones have been turned on to be
9985 * Unnecessary parentheses
9988 * Uppercase variables
9989 * Publicly visible private types
9990 * `#[deriving]` with raw pointers
9991 * Unsafe functions can no longer be coerced to closures.
9992 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9993 * The `#[simd]` attribute is now behind a feature gate.
9994 * Visibility is no longer allowed on `extern crate` statements, and
9995 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9996 * Trailing commas are now allowed in argument lists and tuple patterns.
9997 * The `do` keyword has been removed, it is now a reserved keyword.
9998 * Default type parameters have been implemented, but are feature gated.
9999 * Borrowed variables through captures in closures are now considered soundly.
10000 * `extern mod` is now `extern crate`
10001 * The `Freeze` trait has been removed.
10002 * The `Share` trait has been added for types that can be shared among
10004 * Labels in macros are now hygienic.
10005 * Expression/statement macro invocations can be delimited with `{}` now.
10006 * Treatment of types allowed in `static mut` locations has been tweaked.
10007 * The `*` and `.` operators are now overloadable through the `Deref` and
10009 * `~Trait` and `proc` no longer have `Send` bounds by default.
10010 * Partial type hints are now supported with the `_` type marker.
10011 * An `Unsafe` type was introduced for interior mutability. It is now
10012 considered undefined to transmute from `&T` to `&mut T` without using the
10014 * The #[linkage] attribute was implemented for extern statics/functions.
10015 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10016 * `Pod` was renamed to `Copy`.
10019 * The `libextra` library has been removed. It has now been decomposed into
10020 component libraries with smaller and more focused nuggets of
10021 functionality. The full list of libraries can be found on the
10022 documentation index page.
10023 * std: `std::condition` has been removed. All I/O errors are now propagated
10024 through the `Result` type. In order to assist with error handling, a
10025 `try!` macro for unwrapping errors with an early return and a lint for
10026 unused results has been added. See #12039 for more information.
10027 * std: The `vec` module has been renamed to `slice`.
10028 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10029 This will become the only growable vector in the future.
10030 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10031 are now found at `std::io::BufferedReader` instead of
10032 `std::io::buffered::BufferedReader`.
10033 * std: `print` and `println` are no longer in the prelude, the `print!` and
10034 `println!` macros are intended to be used instead.
10035 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10036 attempts to statically prevent cycles.
10037 * std: The standard distribution is adopting the policy of pushing failure
10038 to the user rather than failing in libraries. Many functions (such as
10039 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10040 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10041 deriving mode: `#[deriving(Show)]`.
10042 * std: `ToStr` is now implemented for all types implementing `Show`.
10043 * std: The formatting trait methods now take `&self` instead of `&T`
10044 * std: The `invert()` method on iterators has been renamed to `rev()`
10045 * std: `std::num` has seen a reduction in the genericity of its traits,
10046 consolidating functionality into a few core traits.
10047 * std: Backtraces are now printed on task failure if the environment
10048 variable `RUST_BACKTRACE` is present.
10049 * std: Naming conventions for iterators have been standardized. More details
10050 can be found on the wiki's style guide.
10051 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10052 still implement the function.
10053 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10054 * std: `assert_approx_eq!` has been removed
10055 * std: The `e` and `E` formatting specifiers for floats have been added to
10056 print them in exponential notation.
10057 * std: The `Times` trait has been removed
10058 * std: Indications of variance and opting out of builtin bounds is done
10059 through marker types in `std::kinds::marker` now
10060 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10061 `#[deriving(Hash)]` is now possible.
10062 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10063 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10064 * std: `Chan::new` is now `channel()`.
10065 * std: A new synchronous channel type has been implemented.
10066 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10067 * std: `hashmap` and `trie` have been moved to `libcollections`
10068 * std: `run` has been rolled into `io::process`
10069 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10070 * std: The equality and comparison traits have seen some reorganization.
10071 * std: `rand` has moved to `librand`.
10072 * std: `to_{lower,upper}case` has been implemented for `char`.
10073 * std: Logging has been moved to `liblog`.
10074 * collections: `HashMap` has been rewritten for higher performance and less
10076 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10077 it can be booted manually. The runtime guide has more information and
10079 * native: All I/O functionality except signals has been implemented.
10080 * green: Task spawning with `libgreen` has been optimized with stack caching
10081 and various trimming of code.
10082 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10083 * sync: The `extra::sync` module has been updated to modern rust (and moved
10084 to the `sync` library), tweaking and improving various interfaces while
10085 dropping redundant functionality.
10086 * sync: A new `Barrier` type has been added to the `sync` library.
10087 * sync: An efficient mutex for native and green tasks has been implemented.
10088 * serialize: The `base64` module has seen some improvement. It treats
10089 newlines better, has non-string error values, and has seen general
10091 * fourcc: A `fourcc!` macro was introduced
10092 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10093 hexadecimal literal.
10096 * `rustpkg` has been deprecated and removed from the main repository. Its
10097 replacement, `cargo`, is under development.
10098 * Nightly builds of rust are now available
10099 * The memory usage of rustc has been improved many times throughout this
10101 * The build process supports disabling rpath support for the rustc binary
10103 * Code generation has improved in some cases, giving more information to the
10104 LLVM optimization passes to enable more extensive optimizations.
10105 * Debuginfo compatibility with lldb on OSX has been restored.
10106 * The master branch is now gated on an android bot, making building for
10107 android much more reliable.
10108 * Output flags have been centralized into one `--emit` flag.
10109 * Crate type flags have been centralized into one `--crate-type` flag.
10110 * Codegen flags have been consolidated behind a `-C` flag.
10111 * Linking against outdated crates now has improved error messages.
10112 * Error messages with lifetimes will often suggest how to annotate the
10113 function to fix the error.
10114 * Many more types are documented in the standard library, and new guides
10116 * Many `rustdoc` improvements:
10117 * code blocks are syntax highlighted.
10118 * render standalone markdown files.
10119 * the --test flag tests all code blocks by default.
10120 * exported macros are displayed.
10121 * re-exported types have their documentation inlined at the location of the
10123 * search works across crates that have been rendered to the same output
10127 Version 0.9 (2014-01-09)
10128 ==========================
10130 * ~1800 changes, numerous bugfixes
10133 * The `float` type has been removed. Use `f32` or `f64` instead.
10134 * A new facility for enabling experimental features (feature gating) has
10135 been added, using the crate-level `#[feature(foo)]` attribute.
10136 * Managed boxes (@) are now behind a feature gate
10137 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10138 standard library's `Gc` or `Rc` types instead.
10139 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10140 * Jumping back to the top of a loop is now done with `continue` instead of
10142 * Strings can no longer be mutated through index assignment.
10143 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10144 hash delimiters, as in `r###"foo"###`.
10145 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10147 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10148 * `@fn`s have been removed.
10149 * `do` only works with procs in order to make it obvious what the cost
10151 * Single-element tuple-like structs can no longer be dereferenced to
10152 obtain the inner value. A more comprehensive solution for overloading
10153 the dereference operator will be provided in the future.
10154 * The `#[link(...)]` attribute has been replaced with
10155 `#[crate_id = "name#vers"]`.
10156 * Empty `impl`s must be terminated with empty braces and may not be
10157 terminated with a semicolon.
10158 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10159 no longer has any special meaning.
10160 * The old `fmt!` string formatting macro has been removed.
10161 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10162 `print!` and `println!`.
10163 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10164 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10165 `extern mod foo = "bar"` instead.
10166 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10167 * Macros can have attributes.
10168 * Macros can expand to items with attributes.
10169 * Macros can expand to multiple items.
10170 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10171 * Comments may be nested.
10172 * Values automatically coerce to trait objects they implement, without
10174 * Enum discriminants are no longer an entire word but as small as needed to
10175 contain all the variants. The `repr` attribute can be used to override
10176 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10177 `#[repr(C)]` to match C enums.
10178 * Non-string literals are not allowed in attributes (they never worked).
10179 * The FFI now supports variadic functions.
10180 * Octal numeric literals, as in `0o7777`.
10181 * The `concat!` syntax extension performs compile-time string concatenation.
10182 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10183 removed as Rust no longer uses segmented stacks.
10184 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10185 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10186 not `*`; ignoring remaining fields of a struct is also done with `..`,
10187 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10188 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10189 * `rustc` supports the "system" calling convention, which defaults to the
10190 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10192 * The `type_overflow` lint (default: warn) checks literals for overflow.
10193 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10194 * The `attribute_usage` lint (default: warn) warns about unknown
10196 * The `unknown_features` lint (default: warn) warns about unknown
10198 * The `dead_code` lint (default: warn) checks for dead code.
10199 * Rust libraries can be linked statically to one another
10200 * `#[link_args]` is behind the `link_args` feature gate.
10201 * Native libraries are now linked with `#[link(name = "foo")]`
10202 * Native libraries can be statically linked to a rust crate
10203 (`#[link(name = "foo", kind = "static")]`).
10204 * Native OS X frameworks are now officially supported
10205 (`#[link(name = "foo", kind = "framework")]`).
10206 * The `#[thread_local]` attribute creates thread-local (not task-local)
10207 variables. Currently behind the `thread_local` feature gate.
10208 * The `return` keyword may be used in closures.
10209 * Types that can be copied via a memcpy implement the `Pod` kind.
10210 * The `cfg` attribute can now be used on struct fields and enum variants.
10213 * std: The `option` and `result` API's have been overhauled to make them
10214 simpler, more consistent, and more composable.
10215 * std: The entire `std::io` module has been replaced with one that is
10216 more comprehensive and that properly interfaces with the underlying
10217 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10219 * std: `io::util` contains a number of useful implementations of
10220 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10221 `ZeroReader`, `TeeReader`.
10222 * std: The reference counted pointer type `extra::rc` moved into std.
10223 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10224 just a wrapper around it).
10225 * std: The `Either` type has been removed.
10226 * std: `fmt::Default` can be implemented for any type to provide default
10227 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10228 * std: The `rand` API continues to be tweaked.
10229 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10230 on failure in gdb, is now named `rust_fail`.
10231 * std: The `each_key` and `each_value` methods on `HashMap` have been
10232 replaced by the `keys` and `values` iterators.
10233 * std: Functions dealing with type size and alignment have moved from the
10234 `sys` module to the `mem` module.
10235 * std: The `path` module was written and API changed.
10236 * std: `str::from_utf8` has been changed to cast instead of allocate.
10237 * std: `starts_with` and `ends_with` methods added to vectors via the
10238 `ImmutableEqVector` trait, which is in the prelude.
10239 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10240 if the index is out of bounds.
10241 * std: Task failure no longer propagates between tasks, as the model was
10242 complex, expensive, and incompatible with thread-based tasks.
10243 * std: The `Any` type can be used for dynamic typing.
10244 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10246 * std: Methods that produce iterators generally do not have an `_iter`
10248 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10249 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10250 * std: `util::ignore` renamed to `prelude::drop`.
10251 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10253 * std: `vec::raw` has seen a lot of cleanup and API changes.
10254 * std: The standard library no longer includes any C++ code, and very
10255 minimal C, eliminating the dependency on libstdc++.
10256 * std: Runtime scheduling and I/O functionality has been factored out into
10257 extensible interfaces and is now implemented by two different crates:
10258 libnative, for native threading and I/O; and libgreen, for green threading
10259 and I/O. This paves the way for using the standard library in more limited
10260 embedded environments.
10261 * std: The `comm` module has been rewritten to be much faster, have a
10262 simpler, more consistent API, and to work for both native and green
10264 * std: All libuv dependencies have been moved into the rustuv crate.
10265 * native: New implementations of runtime scheduling on top of OS threads.
10266 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10268 * green: The green thread scheduler and message passing types are almost
10269 entirely lock-free.
10270 * extra: The `flatpipes` module had bitrotted and was removed.
10271 * extra: All crypto functions have been removed and Rust now has a policy of
10272 not reimplementing crypto in the standard library. In the future crypto
10273 will be provided by external crates with bindings to established libraries.
10274 * extra: `c_vec` has been modernized.
10275 * extra: The `sort` module has been removed. Use the `sort` method on
10279 * The `rust` and `rusti` commands have been removed, due to lack of
10281 * `rustdoc` was completely rewritten.
10282 * `rustdoc` can test code examples in documentation.
10283 * `rustpkg` can test packages with the argument, 'test'.
10284 * `rustpkg` supports arbitrary dependencies, including C libraries.
10285 * `rustc`'s support for generating debug info is improved again.
10286 * `rustc` has better error reporting for unbalanced delimiters.
10287 * `rustc`'s JIT support was removed due to bitrot.
10288 * Executables and static libraries can be built with LTO (-Z lto)
10289 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10293 Version 0.8 (2013-09-26)
10294 ============================
10296 * ~2200 changes, numerous bugfixes
10299 * The `for` loop syntax has changed to work with the `Iterator` trait.
10300 * At long last, unwinding works on Windows.
10301 * Default methods are ready for use.
10302 * Many trait inheritance bugs fixed.
10303 * Owned and borrowed trait objects work more reliably.
10304 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10305 * rustc can omit emission of code for the `debug!` macro if it is passed
10307 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10308 for foo.rs, then foo/mod.rs, and will generate an error when both are
10310 * Strings no longer contain trailing nulls. The new `std::c_str` module
10311 provides new mechanisms for converting to C strings.
10312 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10313 * The FFI has been overhauled such that foreign functions are called directly,
10314 instead of through a stack-switching wrapper.
10315 * Calling a foreign function must be done through a Rust function with the
10316 `#[fixed_stack_segment]` attribute.
10317 * The `externfn!` macro can be used to declare both a foreign function and
10318 a `#[fixed_stack_segment]` wrapper at once.
10319 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10320 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10321 * `priv` is disallowed everywhere except for struct fields and enum variants.
10322 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10323 * `ref` bindings in irrefutable patterns work correctly now.
10324 * `char` is now prevented from containing invalid code points.
10325 * Casting to `bool` is no longer allowed.
10326 * `\0` is now accepted as an escape in chars and strings.
10327 * `yield` is a reserved keyword.
10328 * `typeof` is a reserved keyword.
10329 * Crates may be imported by URL with `extern mod foo = "url";`.
10330 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10331 * Static vectors can be initialized with repeating elements,
10332 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10333 * Static structs can be initialized with functional record update,
10334 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10335 * `cfg!` can be used to conditionally execute code based on the crate
10336 configuration, similarly to `#[cfg(...)]`.
10337 * The `unnecessary_qualification` lint detects unneeded module
10338 prefixes (default: allow).
10339 * Arithmetic operations have been implemented on the SIMD types in
10340 `std::unstable::simd`.
10341 * Exchange allocation headers were removed, reducing memory usage.
10342 * `format!` implements a completely new, extensible, and higher-performance
10343 string formatting system. It will replace `fmt!`.
10344 * `print!` and `println!` write formatted strings (using the `format!`
10345 extension) to stdout.
10346 * `write!` and `writeln!` write formatted strings (using the `format!`
10347 extension) to the new Writers in `std::rt::io`.
10348 * The library section in which a function or static is placed may
10349 be specified with `#[link_section = "..."]`.
10350 * The `proto!` syntax extension for defining bounded message protocols
10352 * `macro_rules!` is hygienic for `let` declarations.
10353 * The `#[export_name]` attribute specifies the name of a symbol.
10354 * `unreachable!` can be used to indicate unreachable code, and fails
10358 * std: Transitioned to the new runtime, written in Rust.
10359 * std: Added an experimental I/O library, `rt::io`, based on the new
10361 * std: A new generic `range` function was added to the prelude, replacing
10362 `uint::range` and friends.
10363 * std: `range_rev` no longer exists. Since range is an iterator it can be
10364 reversed with `range(lo, hi).invert()`.
10365 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10366 renamed to `unwrap_or`.
10367 * std: The `iterator` module was renamed to `iter`.
10368 * std: Integral types now support the `checked_add`, `checked_sub`, and
10369 `checked_mul` operations for detecting overflow.
10370 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10372 * std: Methods are standardizing on conventions for casting methods:
10373 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10375 * std: The `CString` type in `c_str` provides new ways to convert to and
10377 * std: `DoubleEndedIterator` can yield elements in two directions.
10378 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10380 * std: `str::from_bytes` renamed to `str::from_utf8`.
10381 * std: `pop_opt` and `shift_opt` methods added to vectors.
10382 * std: The task-local data interface no longer uses @, and keys are
10383 no longer function pointers.
10384 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10385 * std: Added `SharedPort` to `comm`.
10386 * std: `Eq` has a default method for `ne`; only `eq` is required
10387 in implementations.
10388 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10389 is required in implementations.
10390 * std: `is_utf8` performance is improved, impacting many string functions.
10391 * std: `os::MemoryMap` provides cross-platform mmap.
10392 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10393 are not 'in-bounds' are considered undefined.
10394 * std: Many freestanding functions in `vec` removed in favor of methods.
10395 * std: Many freestanding functions on scalar types removed in favor of
10397 * std: Many options to task builders were removed since they don't make
10398 sense in the new scheduler design.
10399 * std: More containers implement `FromIterator` so can be created by the
10401 * std: More complete atomic types in `unstable::atomics`.
10402 * std: `comm::PortSet` removed.
10403 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10404 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10405 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10406 default implementations.
10407 * std: Various `from_str` functions were removed in favor of a generic
10408 `from_str` which is available in the prelude.
10409 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10410 * extra: `dlist`, the doubly-linked list was modernized.
10411 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10412 * extra: Added `glob` module, replacing `std::os::glob`.
10413 * extra: `rope` was removed.
10414 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10415 * extra: `net`, and `timer` were removed. The experimental replacements
10416 are `std::rt::io::net` and `std::rt::io::timer`.
10417 * extra: Iterators implemented for `SmallIntMap`.
10418 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10419 * extra: `SmallIntSet` removed. Use `BitvSet`.
10420 * extra: Performance of JSON parsing greatly improved.
10421 * extra: `semver` updated to SemVer 2.0.0.
10422 * extra: `term` handles more terminals correctly.
10423 * extra: `dbg` module removed.
10424 * extra: `par` module removed.
10425 * extra: `future` was cleaned up, with some method renames.
10426 * extra: Most free functions in `getopts` were converted to methods.
10429 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10430 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10431 similarly to gcc's `--march` flag.
10432 * rustc's performance compiling small crates is much better.
10433 * rustpkg has received many improvements.
10434 * rustpkg supports git tags as package IDs.
10435 * rustpkg builds into target-specific directories so it can be used for
10437 * The number of concurrent test tasks is controlled by the environment
10438 variable RUST_TEST_TASKS.
10439 * The test harness can now report metrics for benchmarks.
10440 * All tools have man pages.
10441 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10442 * The runtime uses jemalloc for allocations.
10443 * Segmented stacks are temporarily disabled as part of the transition to
10444 the new runtime. Stack overflows are possible!
10445 * A new documentation backend, rustdoc_ng, is available for use. It is
10446 still invoked through the normal `rustdoc` command.
10449 Version 0.7 (2013-07-03)
10450 =======================
10452 * ~2000 changes, numerous bugfixes
10455 * `impl`s no longer accept a visibility qualifier. Put them on methods
10457 * The borrow checker has been rewritten with flow-sensitivity, fixing
10458 many bugs and inconveniences.
10459 * The `self` parameter no longer implicitly means `&'self self`,
10460 and can be explicitly marked with a lifetime.
10461 * Overloadable compound operators (`+=`, etc.) have been temporarily
10462 removed due to bugs.
10463 * The `for` loop protocol now requires `for`-iterators to return `bool`
10464 so they compose better.
10465 * The `Durable` trait is replaced with the `'static` bounds.
10466 * Trait default methods work more often.
10467 * Structs with the `#[packed]` attribute have byte alignment and
10468 no padding between fields.
10469 * Type parameters bound by `Copy` must now be copied explicitly with
10470 the `copy` keyword.
10471 * It is now illegal to move out of a dereferenced unsafe pointer.
10472 * `Option<~T>` is now represented as a nullable pointer.
10473 * `@mut` does dynamic borrow checks correctly.
10474 * The `main` function is only detected at the topmost level of the crate.
10475 The `#[main]` attribute is still valid anywhere.
10476 * Struct fields may no longer be mutable. Use inherited mutability.
10477 * The `#[no_send]` attribute makes a type that would otherwise be
10479 * The `#[no_freeze]` attribute makes a type that would otherwise be
10481 * Unbounded recursion will abort the process after reaching the limit
10482 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10483 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10484 are never implicitly copyable.
10485 * `#[static_assert]` makes compile-time assertions about static bools.
10486 * At long last, 'argument modes' no longer exist.
10487 * The rarely used `use mod` statement no longer exists.
10489 * Syntax extensions
10490 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10492 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10493 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10494 `#[deriving(...)]`.
10495 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10496 and unsuffixed integer literals.
10499 * The `core` crate was renamed to `std`.
10500 * The `std` crate was renamed to `extra`.
10501 * More and improved documentation.
10502 * std: `iterator` module for external iterator objects.
10503 * Many old-style (internal, higher-order function) iterators replaced by
10504 implementations of `Iterator`.
10505 * std: Many old internal vector and string iterators,
10506 incl. `any`, `all`. removed.
10507 * std: The `finalize` method of `Drop` renamed to `drop`.
10508 * std: The `drop` method now takes `&mut self` instead of `&self`.
10509 * std: The prelude no longer re-exports any modules, only types and traits.
10510 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10511 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10512 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10513 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10514 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10515 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10516 * std: Many types implement `Clone`.
10517 * std: `path` type renamed to `Path`.
10518 * std: `mut` module and `Mut` type removed.
10519 * std: Many standalone functions removed in favor of methods and iterators
10520 in `vec`, `str`. In the future methods will also work as functions.
10521 * std: `reinterpret_cast` removed. Use `transmute`.
10522 * std: ascii string handling in `std::ascii`.
10523 * std: `Rand` is implemented for ~/@.
10524 * std: `run` module for spawning processes overhauled.
10525 * std: Various atomic types added to `unstable::atomic`.
10526 * std: Various types implement `Zero`.
10527 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10528 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10529 * std: Added `os::mkdir_recursive`.
10530 * std: Added `os::glob` function performs filesystems globs.
10531 * std: `FuzzyEq` renamed to `ApproxEq`.
10532 * std: `Map` now defines `pop` and `swap` methods.
10533 * std: `Cell` constructors converted to static methods.
10534 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10535 * extra: `flate` module moved from `std` to `extra`.
10536 * extra: `fileinput` module for iterating over a series of files.
10537 * extra: `Complex` number type and `complex` module.
10538 * extra: `Rational` number type and `rational` module.
10539 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10540 * extra: `term` uses terminfo now, is more correct.
10541 * extra: `arc` functions converted to methods.
10542 * extra: Implementation of fixed output size variations of SHA-2.
10545 * `unused_variables` lint mode for unused variables (default: warn).
10546 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10548 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10550 * `dead_assignment` lint mode for unread variables (default: warn).
10551 * `unnecessary_allocation` lint mode detects some heap allocations that are
10552 immediately borrowed so could be written without allocating (default: warn).
10553 * `missing_doc` lint mode (default: allow).
10554 * `unreachable_code` lint mode (default: warn).
10555 * The `rusti` command has been rewritten and a number of bugs addressed.
10556 * rustc outputs in color on more terminals.
10557 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10558 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10559 * Compiling with `-g` will make the binary record information about
10560 dynamic borrowcheck failures for debugging.
10561 * rustdoc has a nicer stylesheet.
10562 * Various improvements to rustdoc.
10563 * Improvements to rustpkg (see the detailed release notes).
10566 Version 0.6 (2013-04-03)
10567 ========================
10569 * ~2100 changes, numerous bugfixes
10572 * The self type parameter in traits is now spelled `Self`
10573 * The `self` parameter in trait and impl methods must now be explicitly
10574 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10575 * Static methods no longer require the `static` keyword and instead
10576 are distinguished by the lack of a `self` parameter
10577 * Replaced the `Durable` trait with the `'static` lifetime
10578 * The old closure type syntax with the trailing sigil has been
10579 removed in favor of the more consistent leading sigil
10580 * `super` is a keyword, and may be prefixed to paths
10581 * Trait bounds are separated with `+` instead of whitespace
10582 * Traits are implemented with `impl Trait for Type`
10583 instead of `impl Type: Trait`
10584 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10585 * The `export` keyword has finally been removed
10586 * The `move` keyword has been removed (see "Semantic changes")
10587 * The interior mutability qualifier on vectors, `[mut T]`, has been
10588 removed. Use `&mut [T]`, etc.
10589 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10590 * `fail` is no longer a keyword. Use `fail!()`
10591 * `assert` is no longer a keyword. Use `assert!()`
10592 * `log` is no longer a keyword. use `debug!`, etc.
10593 * 1-tuples may be represented as `(T,)`
10594 * Struct fields may no longer be `mut`. Use inherited mutability,
10595 `@mut T`, `core::mut` or `core::cell`
10596 * `extern mod { ... }` is no longer valid syntax for foreign
10597 function modules. Use extern blocks: `extern { ... }`
10598 * Newtype enums removed. Use tuple-structs.
10599 * Trait implementations no longer support visibility modifiers
10600 * Pattern matching over vectors improved and expanded
10601 * `const` renamed to `static` to correspond to lifetime name,
10602 and make room for future `static mut` unsafe mutable globals.
10603 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10604 * `Clone` implementations can be automatically generated with
10605 `#[deriving(Clone)]`
10606 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10607 instead of `foo as Bar`.
10608 * Fixed length vector types are now written as `[int, .. 3]`
10609 instead of `[int * 3]`.
10610 * Fixed length vector types can express the length as a constant
10611 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10614 * Types with owned pointers or custom destructors move by default,
10615 eliminating the `move` keyword
10616 * All foreign functions are considered unsafe
10617 * &mut is now unaliasable
10618 * Writes to borrowed @mut pointers are prevented dynamically
10620 * The name of the main function can be customized using #[main]
10621 * The default type of an inferred closure is &fn instead of @fn
10622 * `use` statements may no longer be "chained" - they cannot import
10623 identifiers imported by previous `use` statements
10624 * `use` statements are crate relative, importing from the "top"
10625 of the crate by default. Paths may be prefixed with `super::`
10626 or `self::` to change the search behavior.
10627 * Method visibility is inherited from the implementation declaration
10628 * Structural records have been removed
10629 * Many more types can be used in static items, including enums
10630 'static-lifetime pointers and vectors
10631 * Pattern matching over vectors improved and expanded
10632 * Typechecking of closure types has been overhauled to
10633 improve inference and eliminate unsoundness
10634 * Macros leave scope at the end of modules, unless that module is
10635 tagged with #[macro_escape]
10638 * Added big integers to `std::bigint`
10639 * Removed `core::oldcomm` module
10640 * Added pipe-based `core::comm` module
10641 * Numeric traits have been reorganized under `core::num`
10642 * `vec::slice` finally returns a slice
10643 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10644 * Containers reorganized around traits in `core::container`
10645 * `core::dvec` removed, `~[T]` is a drop-in replacement
10646 * `core::send_map` renamed to `core::hashmap`
10647 * `std::map` removed; replaced with `core::hashmap`
10648 * `std::treemap` reimplemented as an owned balanced tree
10649 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10650 * `core::trie` added as a fast ordered map for integer keys
10651 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10652 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10653 overload the comparison operators, whereas `TotalOrd` is used
10654 by certain container types
10657 * Replaced the 'cargo' package manager with 'rustpkg'
10658 * Added all-purpose 'rust' tool
10659 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10660 * rustc now *attempts* to offer spelling suggestions
10661 * Improved support for ARM and Android
10662 * Preliminary MIPS backend
10663 * Improved foreign function ABI implementation for x86, x86_64
10664 * Various memory usage improvements
10665 * Rust code may be embedded in foreign code under limited circumstances
10666 * Inline assembler supported by new asm!() syntax extension.
10669 Version 0.5 (2012-12-21)
10670 ===========================
10672 * ~900 changes, numerous bugfixes
10675 * Removed `<-` move operator
10676 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10677 * Removed old fixed length vector syntax - `[T]/N`
10678 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10679 * Macros may now expand to items and statements
10680 * `a.b()` is always parsed as a method call, never as a field projection
10681 * `Eq` and `IterBytes` implementations can be automatically generated
10682 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10683 * Removed the special crate language for `.rc` files
10684 * Function arguments may consist of any irrefutable pattern
10687 * `&` and `~` pointers may point to objects
10688 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10689 * Enum variants may be structs
10690 * Destructors can be added to all nominal types with the Drop trait
10691 * Structs and nullary enum variants may be constants
10692 * Values that cannot be implicitly copied are now automatically moved
10693 without writing `move` explicitly
10694 * `&T` may now be coerced to `*T`
10695 * Coercions happen in `let` statements as well as function calls
10696 * `use` statements now take crate-relative paths
10697 * The module and type namespaces have been merged so that static
10698 method names can be resolved under the trait in which they are
10701 * Improved support for language features
10702 * Trait inheritance works in many scenarios
10703 * More support for explicit self arguments in methods - `self`, `&self`
10704 `@self`, and `~self` all generally work as expected
10705 * Static methods work in more situations
10706 * Experimental: Traits may declare default methods for the implementations
10710 * New condition handling system in `core::condition`
10711 * Timsort added to `std::sort`
10712 * New priority queue, `std::priority_queue`
10713 * Pipes for serializable types, `std::flatpipes'
10714 * Serialization overhauled to be trait-based
10715 * Expanded `getopts` definitions
10716 * Moved futures to `std`
10717 * More functions are pure now
10718 * `core::comm` renamed to `oldcomm`. Still deprecated
10719 * `rustdoc` and `cargo` are libraries now
10722 * Added a preliminary REPL, `rusti`
10723 * License changed from MIT to dual MIT/APL2
10726 Version 0.4 (2012-10-15)
10727 ==========================
10729 * ~2000 changes, numerous bugfixes
10732 * All keywords are now strict and may not be used as identifiers anywhere
10733 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10734 'of', 'with', 'to', 'class'.
10735 * Classes are replaced with simpler structs
10736 * Explicit method self types
10737 * `ret` became `return` and `alt` became `match`
10738 * `import` is now `use`; `use is now `extern mod`
10739 * `extern mod { ... }` is now `extern { ... }`
10740 * `use mod` is the recommended way to import modules
10741 * `pub` and `priv` replace deprecated export lists
10742 * The syntax of `match` pattern arms now uses fat arrow (=>)
10743 * `main` no longer accepts an args vector; use `os::args` instead
10746 * Trait implementations are now coherent, ala Haskell typeclasses
10747 * Trait methods may be static
10748 * Argument modes are deprecated
10749 * Borrowed pointers are much more mature and recommended for use
10750 * Strings and vectors in the static region are stored in constant memory
10751 * Typestate was removed
10752 * Resolution rewritten to be more reliable
10753 * Support for 'dual-mode' data structures (freezing and thawing)
10756 * Most binary operators can now be overloaded via the traits in
10758 * `std::net::url` for representing URLs
10759 * Sendable hash maps in `core::send_map`
10760 * `core::task' gained a (currently unsafe) task-local storage API
10763 * An efficient new intertask communication primitive called the pipe,
10764 along with a number of higher-level channel types, in `core::pipes`
10765 * `std::arc`, an atomically reference counted, immutable, shared memory
10767 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10768 * Futures are now based on pipes and sendable
10769 * More robust linked task failure
10770 * Improved task builder API
10773 * Improved error reporting
10774 * Preliminary JIT support
10775 * Preliminary work on precise GC
10776 * Extensive architectural improvements to rustc
10777 * Begun a transition away from buggy C++-based reflection (shape) code to
10778 Rust-based (visitor) code
10779 * All hash functions and tables converted to secure, randomized SipHash
10782 Version 0.3 (2012-07-12)
10783 ========================
10785 * ~1900 changes, numerous bugfixes
10787 * New coding conveniences
10788 * Integer-literal suffix inference
10789 * Per-item control over warnings, errors
10790 * #[cfg(windows)] and #[cfg(unix)] attributes
10791 * Documentation comments
10792 * More compact closure syntax
10793 * 'do' expressions for treating higher-order functions as
10795 * *-patterns (wildcard extended to all constructor fields)
10798 * Name resolution pass and exhaustiveness checker rewritten
10799 * Region pointers and borrow checking supersede alias
10801 * Init-ness checking is now provided by a region-based liveness
10802 pass instead of the typestate pass; same for last-use analysis
10803 * Extensive work on region pointers
10805 * Experimental new language features
10806 * Slices and fixed-size, interior-allocated vectors
10807 * #!-comments for lang versioning, shell execution
10808 * Destructors and iface implementation for classes;
10809 type-parameterized classes and class methods
10810 * 'const' type kind for types that can be used to implement
10811 shared-memory concurrency patterns
10815 * Removal of various obsolete features
10816 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10817 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10819 * Constructs: do-while loops ('do' repurposed), fn binding,
10820 resources (replaced by destructors)
10822 * Compiler reorganization
10823 * Syntax-layer of compiler split into separate crate
10824 * Clang (from LLVM project) integrated into build
10825 * Typechecker split into sub-modules
10828 * New time functions
10829 * Extension methods for many built-in types
10830 * Arc: atomic-refcount read-only / exclusive-use shared cells
10831 * Par: parallel map and search routines
10832 * Extensive work on libuv interface
10833 * Much vector code moved to libraries
10834 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10835 #include, #include_str, #include_bin
10837 * Tool improvements
10838 * Cargo automatically resolves dependencies
10841 Version 0.2 (2012-03-29)
10842 =========================
10844 * >1500 changes, numerous bugfixes
10846 * New docs and doc tooling
10848 * New port: FreeBSD x86_64
10850 * Compilation model enhancements
10851 * Generics now specialized, multiply instantiated
10852 * Functions now inlined across separate crates
10854 * Scheduling, stack and threading fixes
10855 * Noticeably improved message-passing performance
10856 * Explicit schedulers
10860 * Experimental new language features
10861 * Operator overloading
10865 * Various language extensions
10866 * C-callback function types: 'crust fn ...'
10867 * Infinite-loop construct: 'loop { ... }'
10868 * Shorten 'mutable' to 'mut'
10869 * Required mutable-local qualifier: 'let mut ...'
10870 * Basic glob-exporting: 'export foo::*;'
10871 * Alt now exhaustive, 'alt check' for runtime-checked
10872 * Block-function form of 'for' loop, with 'break' and 'ret'.
10875 * AST quasi-quote syntax extension
10876 * Revived libuv interface
10877 * New modules: core::{future, iter}, std::arena
10878 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10879 * Extensive cleanup, regularization in libstd, libcore
10882 Version 0.1 (2012-01-20)
10883 ===============================
10885 * Most language features work, including:
10886 * Unique pointers, unique closures, move semantics
10887 * Interface-constrained generics
10888 * Static interface dispatch
10890 * Multithread task scheduling
10891 * Typestate predicates
10892 * Failure unwinding, destructors
10893 * Pattern matching and destructuring assignment
10894 * Lightweight block-lambda syntax
10895 * Preliminary macro-by-example
10897 * Compiler works with the following configurations:
10898 * Linux: x86 and x86_64 hosts and targets
10899 * macOS: x86 and x86_64 hosts and targets
10900 * Windows: x86 hosts and targets
10902 * Cross compilation / multi-target configuration supported.
10904 * Preliminary API-documentation and package-management tools included.
10908 * Documentation is incomplete.
10910 * Performance is below intended target.
10912 * Standard library APIs are subject to extensive change, reorganization.
10914 * Language-level versioning is not yet operational - future code will
10915 break unexpectedly.