1 Version 1.59.0 (2022-02-24)
2 ==========================
7 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
8 - [Stabilize destructuring assignment][90521]
9 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
10 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
15 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
16 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
17 - [Fix sparc64 ABI for aggregates with floating point members][91003]
18 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
19 - [Add support for riscv64gc-unknown-freebsd][91284]
20 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
21 - [Soft disable incremental compilation][94124]
23 This release disables incremental compilation, unless the user has explicitly
24 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
25 This is due to a known and relatively frequently occurring bug in incremental
26 compilation, which causes builds to issue internal compiler errors. This
27 particular bug is already fixed on nightly, but that fix has not yet rolled out
28 to stable and is deemed too risky for a direct stable backport.
30 As always, we encourage users to test with nightly and report bugs so that we
31 can track failures and fix issues earlier.
33 See [94124] for more details.
35 [94124]: https://github.com/rust-lang/rust/issues/94124
40 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
45 - [`std::thread::available_parallelism`][available_parallelism]
46 - [`Result::copied`][result-copied]
47 - [`Result::cloned`][result-cloned]
49 - [`arch::global_asm!`][global_asm]
50 - [`ops::ControlFlow::is_break`][is_break]
51 - [`ops::ControlFlow::is_continue`][is_continue]
52 - [`TryFrom<char> for u8`][try_from_char_u8]
53 - [`char::TryFromCharError`][try_from_char_err]
54 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
56 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
57 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
58 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
59 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
60 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
61 - [`DoubleEndedIterator for ToLowercase`][lowercase]
62 - [`DoubleEndedIterator for ToUppercase`][uppercase]
63 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
64 - [`UnwindSafe for Once`][unwindsafe_once]
65 - [`RefUnwindSafe for Once`][refunwindsafe_once]
66 - [armv8 neon intrinsics for aarch64][stdarch/1266]
70 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
71 - [`mem::MaybeUninit::assume_init`][muninit_init]
72 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
73 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
78 - [Stabilize the `strip` profile option][cargo/10088]
79 - [Stabilize future-incompat-report][cargo/10165]
80 - [Support abbreviating `--release` as `-r`][cargo/10133]
81 - [Support `term.quiet` configuration][cargo/10152]
82 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
87 - [Refactor weak symbols in std::sys::unix][90846]
88 This may add new, versioned, symbols when building with a newer glibc, as the
89 standard library uses weak linkage rather than dynamically attempting to load
90 certain symbols at runtime.
91 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
92 This adds a future compatibility lint to supporting the use of cfg_attr
93 wrapping either crate_type or crate_name specification within Rust files;
94 it is recommended that users migrate to setting the equivalent command line
96 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
97 This may expose new names, leading to conflicts with preexisting names in a
98 given namespace and a compilation failure.
99 - [Cargo will document libraries before binaries.][cargo/10172]
100 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
101 - [Weaken guarantee around advancing underlying iterators in zip][83791]
102 - [Make split_inclusive() on an empty slice yield an empty output][89825]
103 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
104 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
109 These changes provide no direct user facing benefits, but represent significant
110 improvements to the internals and overall performance of rustc
113 - [Fix many cases of normalization-related ICEs][91255]
114 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
115 - [Store liveness in interval sets for region inference][90637]
117 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
118 unstable feature.][91867]
120 [91867]: https://github.com/rust-lang/rust/issues/91867
121 [83744]: https://github.com/rust-lang/rust/pull/83744/
122 [83791]: https://github.com/rust-lang/rust/pull/83791/
123 [85013]: https://github.com/rust-lang/rust/pull/85013/
124 [89825]: https://github.com/rust-lang/rust/pull/89825/
125 [89999]: https://github.com/rust-lang/rust/pull/89999/
126 [90128]: https://github.com/rust-lang/rust/pull/90128/
127 [90207]: https://github.com/rust-lang/rust/pull/90207/
128 [90521]: https://github.com/rust-lang/rust/pull/90521/
129 [90586]: https://github.com/rust-lang/rust/pull/90586/
130 [90637]: https://github.com/rust-lang/rust/pull/90637/
131 [90833]: https://github.com/rust-lang/rust/pull/90833/
132 [90846]: https://github.com/rust-lang/rust/pull/90846/
133 [91003]: https://github.com/rust-lang/rust/pull/91003/
134 [91172]: https://github.com/rust-lang/rust/pull/91172/
135 [91255]: https://github.com/rust-lang/rust/pull/91255/
136 [91284]: https://github.com/rust-lang/rust/pull/91284/
137 [91535]: https://github.com/rust-lang/rust/pull/91535/
138 [91593]: https://github.com/rust-lang/rust/pull/91593/
139 [91728]: https://github.com/rust-lang/rust/pull/91728/
140 [91878]: https://github.com/rust-lang/rust/pull/91878/
141 [91896]: https://github.com/rust-lang/rust/pull/91896/
142 [91926]: https://github.com/rust-lang/rust/pull/91926/
143 [91984]: https://github.com/rust-lang/rust/pull/91984/
144 [92020]: https://github.com/rust-lang/rust/pull/92020/
145 [92034]: https://github.com/rust-lang/rust/pull/92034/
146 [92137]: https://github.com/rust-lang/rust/pull/92137/
147 [92483]: https://github.com/rust-lang/rust/pull/92483/
148 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
149 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
150 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
151 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
152 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
153 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
154 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
155 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
157 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
158 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
159 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
160 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
161 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
162 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
163 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
164 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
165 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
166 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
167 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
168 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
169 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
170 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
171 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
172 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
173 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
174 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
175 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
176 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
177 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
178 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
179 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
180 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
181 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
183 Version 1.58.1 (2022-01-19)
184 ===========================
186 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
187 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
188 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
189 * [Fix wrong error message displayed when some imports are missing][91254]
190 * [Fix rustfmt not formatting generated files from stdin][92912]
192 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
193 [91254]: https://github.com/rust-lang/rust/pull/91254
194 [92912]: https://github.com/rust-lang/rust/pull/92912
195 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
196 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
198 Version 1.58.0 (2022-01-13)
199 ==========================
204 - [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.
205 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
206 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
211 - [Add LLVM CFI support to the Rust compiler][89652]
212 - [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.
213 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
214 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
215 - [Update the minimum external LLVM to 12][90175]
216 - [Add `x86_64-unknown-none` at Tier 3*][89062]
217 - [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.
218 - [Don't abort compilation after giving a lint error][87337]
219 - [Error messages point at the source of trait bound obligations in more places][89580]
221 \* Refer to Rust's [platform support page][platform-support-doc] for more
222 information on Rust's tiered platform support.
227 - [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.
228 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
229 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
230 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
231 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
232 - [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).
237 - [`Metadata::is_symlink`]
238 - [`Path::is_symlink`]
239 - [`{integer}::saturating_div`]
240 - [`Option::unwrap_unchecked`]
241 - [`Result::unwrap_unchecked`]
242 - [`Result::unwrap_err_unchecked`]
245 These APIs are now usable in const contexts:
248 - [`Duration::checked_add`]
249 - [`Duration::saturating_add`]
250 - [`Duration::checked_sub`]
251 - [`Duration::saturating_sub`]
252 - [`Duration::checked_mul`]
253 - [`Duration::saturating_mul`]
254 - [`Duration::checked_div`]
259 - [Add --message-format for install command][cargo/10107]
260 - [Warn when alias shadows external subcommand][cargo/10082]
265 - [Show all Deref implementations recursively in rustdoc][90183]
266 - [Use computed visibility in rustdoc][88447]
271 - [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.
272 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
273 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
274 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
275 - [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.
276 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
281 These changes provide no direct user facing benefits, but represent significant
282 improvements to the internals and overall performance of rustc
285 - [Implement coherence checks for negative trait impls][90104]
286 - [Add rustc lint, warning when iterating over hashmaps][89558]
287 - [Optimize live point computation][90491]
288 - [Enable verification for 1/32nd of queries loaded from disk][90361]
289 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
291 [87337]: https://github.com/rust-lang/rust/pull/87337/
292 [87467]: https://github.com/rust-lang/rust/pull/87467/
293 [87704]: https://github.com/rust-lang/rust/pull/87704/
294 [88041]: https://github.com/rust-lang/rust/pull/88041/
295 [88447]: https://github.com/rust-lang/rust/pull/88447/
296 [88601]: https://github.com/rust-lang/rust/pull/88601/
297 [89062]: https://github.com/rust-lang/rust/pull/89062/
298 [89174]: https://github.com/rust-lang/rust/pull/89174/
299 [89551]: https://github.com/rust-lang/rust/pull/89551/
300 [89558]: https://github.com/rust-lang/rust/pull/89558/
301 [89580]: https://github.com/rust-lang/rust/pull/89580/
302 [89652]: https://github.com/rust-lang/rust/pull/89652/
303 [90041]: https://github.com/rust-lang/rust/pull/90041/
304 [90058]: https://github.com/rust-lang/rust/pull/90058/
305 [90104]: https://github.com/rust-lang/rust/pull/90104/
306 [90117]: https://github.com/rust-lang/rust/pull/90117/
307 [90175]: https://github.com/rust-lang/rust/pull/90175/
308 [90183]: https://github.com/rust-lang/rust/pull/90183/
309 [90297]: https://github.com/rust-lang/rust/pull/90297/
310 [90329]: https://github.com/rust-lang/rust/pull/90329/
311 [90361]: https://github.com/rust-lang/rust/pull/90361/
312 [90417]: https://github.com/rust-lang/rust/pull/90417/
313 [90473]: https://github.com/rust-lang/rust/pull/90473/
314 [90491]: https://github.com/rust-lang/rust/pull/90491/
315 [90733]: https://github.com/rust-lang/rust/pull/90733/
316 [90833]: https://github.com/rust-lang/rust/pull/90833/
317 [90846]: https://github.com/rust-lang/rust/pull/90846/
318 [91026]: https://github.com/rust-lang/rust/pull/91026/
319 [91207]: https://github.com/rust-lang/rust/pull/91207/
320 [91255]: https://github.com/rust-lang/rust/pull/91255/
321 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
322 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
323 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
324 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
325 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
326 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
327 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
328 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
329 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
330 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
332 Version 1.57.0 (2021-12-02)
333 ==========================
338 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
339 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
340 - [Allow panicking in constant evaluation.][89508]
341 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
346 - [Create more accurate debuginfo for vtables.][89597]
347 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
348 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
349 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
350 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
352 \* Refer to Rust's [platform support page][platform-support-doc] for more
353 information on Rust's tiered platform support.
358 - [Avoid allocations and copying in `Vec::leak`][89337]
359 - [Add `#[repr(i8)]` to `Ordering`][89507]
360 - [Optimize `File::read_to_end` and `read_to_string`][89582]
361 - [Update to Unicode 14.0][89614]
362 - [Many more functions are marked `#[must_use]`][89692], producing a warning
363 when ignoring their return value. This helps catch mistakes such as expecting
364 a function to mutate a value in place rather than return a new value.
369 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
370 - [`[T; N]::as_slice`][`array::as_slice`]
371 - [`collections::TryReserveError`]
372 - [`HashMap::try_reserve`]
373 - [`HashSet::try_reserve`]
374 - [`String::try_reserve`]
375 - [`String::try_reserve_exact`]
376 - [`Vec::try_reserve`]
377 - [`Vec::try_reserve_exact`]
378 - [`VecDeque::try_reserve`]
379 - [`VecDeque::try_reserve_exact`]
380 - [`Iterator::map_while`]
382 - [`proc_macro::is_available`]
383 - [`Command::get_program`]
384 - [`Command::get_args`]
385 - [`Command::get_envs`]
386 - [`Command::get_current_dir`]
390 These APIs are now usable in const contexts:
392 - [`hint::unreachable_unchecked`]
397 - [Stabilize custom profiles][cargo/9943]
402 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
403 This will break some builds that set `#![deny(dead_code)]`.
407 These changes provide no direct user facing benefits, but represent significant
408 improvements to the internals and overall performance of rustc
411 - [Added an experimental backend for codegen with `libgccjit`.][87260]
413 [85200]: https://github.com/rust-lang/rust/pull/85200/
414 [86191]: https://github.com/rust-lang/rust/pull/86191/
415 [87220]: https://github.com/rust-lang/rust/pull/87220/
416 [87260]: https://github.com/rust-lang/rust/pull/87260/
417 [88321]: https://github.com/rust-lang/rust/pull/88321/
418 [88529]: https://github.com/rust-lang/rust/pull/88529/
419 [88690]: https://github.com/rust-lang/rust/pull/88690/
420 [88952]: https://github.com/rust-lang/rust/pull/88952/
421 [89337]: https://github.com/rust-lang/rust/pull/89337/
422 [89507]: https://github.com/rust-lang/rust/pull/89507/
423 [89508]: https://github.com/rust-lang/rust/pull/89508/
424 [89582]: https://github.com/rust-lang/rust/pull/89582/
425 [89597]: https://github.com/rust-lang/rust/pull/89597/
426 [89614]: https://github.com/rust-lang/rust/pull/89614/
427 [89692]: https://github.com/rust-lang/rust/issues/89692/
428 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
429 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
430 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
431 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
432 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
433 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
434 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
435 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
436 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
437 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
438 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
439 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
440 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
441 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
442 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
443 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
444 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
445 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
446 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
447 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
448 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
450 Version 1.56.1 (2021-11-01)
451 ===========================
453 - New lints to detect the presence of bidirectional-override Unicode
454 codepoints in the compiled source code ([CVE-2021-42574])
456 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
458 Version 1.56.0 (2021-10-21)
459 ========================
464 - [The 2021 Edition is now stable.][rust#88100]
465 See [the edition guide][rust-2021-edition-guide] for more details.
466 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
467 - [Union field access is permitted in `const fn`.][rust#85769]
469 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
474 - [Upgrade to LLVM 13.][rust#87570]
475 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
476 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
477 - [Warnings can be forced on with `--force-warn`.][rust#87472]
478 This feature is primarily intended for usage by `cargo fix`, rather than end users.
479 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
480 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
481 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
483 \* Refer to Rust's [platform support page][platform-support-doc] for more
484 information on Rust's tiered platform support.
489 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
490 The Windows console still requires valid Unicode, but this change allows
491 splitting a UTF-8 character across multiple write calls. This allows, for
492 instance, programs that just read and write data buffers (e.g. copying a file
493 to stdout) without regard for Unicode or character boundaries.
494 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
495 For this use case, atomics scale much better under contention.
496 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
497 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
498 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
499 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
500 - [Treat invalid environment variable names as non-existent.][rust#86183]
501 Previously, the environment functions would panic if given a variable name
502 with an internal null character or equal sign (`=`). Now, these functions will
503 just treat such names as non-existent variables, since the OS cannot represent
504 the existence of a variable with such a name.
509 - [`std::os::unix::fs::chroot`]
510 - [`UnsafeCell::raw_get`]
511 - [`BufWriter::into_parts`]
512 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
513 These APIs were previously stable in `std`, but are now also available in `core`.
515 - [`String::shrink_to`]
516 - [`OsString::shrink_to`]
517 - [`PathBuf::shrink_to`]
518 - [`BinaryHeap::shrink_to`]
519 - [`VecDeque::shrink_to`]
520 - [`HashMap::shrink_to`]
521 - [`HashSet::shrink_to`]
523 These APIs are now usable in const contexts:
525 - [`std::mem::transmute`]
526 - [`[T]::first`][`slice::first`]
527 - [`[T]::split_first`][`slice::split_first`]
528 - [`[T]::last`][`slice::last`]
529 - [`[T]::split_last`][`slice::split_last`]
534 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
535 This has no effect at present on dependency version selection.
536 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
537 that support Rust code to include a crate's specified minimum version in the test matrix for that
543 - [Update to new argument parsing rules on Windows.][rust#87580]
544 This adjusts Rust's standard library to match the behavior of the standard
545 libraries for C/C++. The rules have changed slightly over time, and this PR
546 brings us to the latest set of rules (changed in 2008).
547 - [Disallow the aapcs calling convention on aarch64][rust#88399]
548 This was already not supported by LLVM; this change surfaces this lack of
549 support with a better error message.
550 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
551 - [Warn when an escaped newline skips multiple lines.][rust#87671]
552 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
553 may return different values on glibc <= 2.24.][rust#81825]
554 Rust now invokes the `clone3` system call directly, when available, to use new functionality
555 available via that system call. Older versions of glibc cache the result of `getpid`, and only
556 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
557 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
561 These changes provide no direct user facing benefits, but represent significant
562 improvements to the internals and overall performance of rustc
565 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
566 This improves the performance of most Rust builds.
567 - [Unify representation of macros in internal data structures.][rust#88019]
568 This change fixes a host of bugs with the handling of macros by the compiler,
571 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
572 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
573 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
574 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
575 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
576 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
577 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
578 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
579 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
580 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
581 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
582 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
583 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
584 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
585 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
586 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
587 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
588 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
589 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
590 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
591 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
592 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
593 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
594 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
595 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
596 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
597 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
598 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
599 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
600 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
601 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
602 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
603 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
604 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
605 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
606 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
607 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
608 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
609 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
610 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
611 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
612 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
614 Version 1.55.0 (2021-09-09)
615 ============================
619 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
620 will end at the maximum value of the integer.][83918]
621 - [You can now explicitly import the prelude of different editions
622 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
626 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
628 \* Refer to Rust's [platform support page][platform-support-doc] for more
629 information on Rust's tiered platform support.
634 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
635 These improvements should in general provide faster string parsing of floats,
636 no longer reject certain valid floating point values, and reduce
637 the produced code size for non-stripped artifacts.
638 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
645 - [`IntoInnerError::into_error`]
646 - [`IntoInnerError::into_parts`]
647 - [`MaybeUninit::assume_init_mut`]
648 - [`MaybeUninit::assume_init_ref`]
649 - [`MaybeUninit::write`]
651 - [`ops::ControlFlow`]
653 - [`x86::_bittestandcomplement`]
654 - [`x86::_bittestandreset`]
655 - [`x86::_bittestandset`]
656 - [`x86_64::_bittest64`]
657 - [`x86_64::_bittestandcomplement64`]
658 - [`x86_64::_bittestandreset64`]
659 - [`x86_64::_bittestandset64`]
661 The following previously stable functions are now `const`.
663 - [`str::from_utf8_unchecked`]
668 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
669 rustc in parallel such as when using `cargo test`.][cargo/9675]
670 - [The package definition in `cargo metadata` now includes the `"default_run"`
671 field from the manifest.][cargo/9550]
672 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
673 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
674 of packages.][cargo/9663]
678 - [Added "Go to item on exact match" search option.][85876]
679 - [The "Implementors" section on traits no longer shows redundant
680 method definitions.][85970]
681 - [Trait implementations are toggled open by default.][86260] This should make the
682 implementations more searchable by tools like `CTRL+F` in your browser.
683 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
684 through type aliases.][86334]
685 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
686 "Trait Implementations" section.][86513]
691 - [std functions that return an `io::Error` will no longer use the
692 `ErrorKind::Other` variant.][85746] This is to better reflect that these
693 kinds of errors could be categorised [into newer more specific `ErrorKind`
694 variants][79965], and that they do not represent a user error.
695 - [Using environment variable names with `process::Command` on Windows now
696 behaves as expected.][85270] Previously using envionment variables with
697 `Command` would cause them to be ASCII-uppercased.
698 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
699 with `rustdoc::`][86849]
700 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
701 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
702 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
705 [86849]: https://github.com/rust-lang/rust/pull/86849
706 [86513]: https://github.com/rust-lang/rust/pull/86513
707 [86334]: https://github.com/rust-lang/rust/pull/86334
708 [86260]: https://github.com/rust-lang/rust/pull/86260
709 [85970]: https://github.com/rust-lang/rust/pull/85970
710 [85876]: https://github.com/rust-lang/rust/pull/85876
711 [83572]: https://github.com/rust-lang/rust/pull/83572
712 [86294]: https://github.com/rust-lang/rust/pull/86294
713 [86858]: https://github.com/rust-lang/rust/pull/86858
714 [86761]: https://github.com/rust-lang/rust/pull/86761
715 [85746]: https://github.com/rust-lang/rust/pull/85746
716 [85270]: https://github.com/rust-lang/rust/pull/85270
717 [83918]: https://github.com/rust-lang/rust/pull/83918
718 [79965]: https://github.com/rust-lang/rust/pull/79965
719 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
720 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
721 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
722 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
723 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
724 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
725 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
726 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
727 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
728 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
729 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
730 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
731 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
732 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
733 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
734 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
735 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
736 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
737 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
738 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
739 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
740 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
743 Version 1.54.0 (2021-07-29)
744 ============================
747 -----------------------
749 - [You can now use macros for values in some built-in attributes.][83366]
750 This primarily allows you to call macros within the `#[doc]` attribute. For
751 example, to include external documentation in your crate, you can now write
754 #![doc = include_str!("README.md")]
757 - [You can now cast between unsized slice types (and types which contain
758 unsized slices) in `const fn`.][85078]
759 - [You can now use multiple generic lifetimes with `impl Trait` where the
760 lifetimes don't explicitly outlive another.][84701] In code this means
761 that you can now have `impl Trait<'a, 'b>` where as before you could
762 only have `impl Trait<'a, 'b> where 'b: 'a`.
765 -----------------------
767 - [Rustc will now search for custom JSON targets in
768 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
769 directory.][83800] You can find your sysroot directory by running
770 `rustc --print sysroot`.
771 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
772 - [You can now use `#[target_feature]` on safe functions when targeting
773 WebAssembly platforms.][84988]
774 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
775 - [Added tier 3\* support for `bpfel-unknown-none`
776 and `bpfeb-unknown-none`.][79608]
777 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
779 \* Refer to Rust's [platform support page][platform-support-doc] for more
780 information on Rust's tiered platform support.
783 -----------------------
785 - [`panic::panic_any` will now `#[track_caller]`.][85745]
786 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
787 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
788 - [The implementations of vendor intrinsics in core::arch have been
789 significantly refactored.][83278] The main user-visible changes are
790 a 50% reduction in the size of libcore.rlib and stricter validation
791 of constant operands passed to intrinsics. The latter is technically
792 a breaking change, but allows Rust to more closely match the C vendor
798 - [`BTreeMap::into_keys`]
799 - [`BTreeMap::into_values`]
800 - [`HashMap::into_keys`]
801 - [`HashMap::into_values`]
803 - [`VecDeque::binary_search`]
804 - [`VecDeque::binary_search_by`]
805 - [`VecDeque::binary_search_by_key`]
806 - [`VecDeque::partition_point`]
811 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
812 the dependency graph.][cargo/9520]
813 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
814 in the tree ][cargo/9499]
815 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
816 macro dependencies.][cargo/9488]
817 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
818 This variable points to a directory that integration tests and benches
819 can use as a "scratchpad" for testing filesystem operations.
823 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
824 - [Previously unsound code is no longer permitted where different constructors in branches
825 could require different lifetimes.][85574]
826 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
827 than before and may reject some previously accepted code.
828 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
829 when compiled with `codegen-units = 1`.][86063]
831 [85574]: https://github.com/rust-lang/rust/issues/85574
832 [86831]: https://github.com/rust-lang/rust/issues/86831
833 [86063]: https://github.com/rust-lang/rust/issues/86063
834 [79608]: https://github.com/rust-lang/rust/pull/79608
835 [84988]: https://github.com/rust-lang/rust/pull/84988
836 [84701]: https://github.com/rust-lang/rust/pull/84701
837 [84072]: https://github.com/rust-lang/rust/pull/84072
838 [85745]: https://github.com/rust-lang/rust/pull/85745
839 [84744]: https://github.com/rust-lang/rust/pull/84744
840 [85078]: https://github.com/rust-lang/rust/pull/85078
841 [84717]: https://github.com/rust-lang/rust/pull/84717
842 [83800]: https://github.com/rust-lang/rust/pull/83800
843 [83366]: https://github.com/rust-lang/rust/pull/83366
844 [83278]: https://github.com/rust-lang/rust/pull/83278
845 [85292]: https://github.com/rust-lang/rust/pull/85292
846 [82834]: https://github.com/rust-lang/rust/pull/82834
847 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
848 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
849 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
850 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
851 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
852 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
853 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
854 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
855 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
856 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
857 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
859 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
861 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
863 Version 1.53.0 (2021-06-17)
864 ============================
867 -----------------------
868 - [You can now use unicode for identifiers.][83799] This allows multilingual
869 identifiers but still doesn't allow glyphs that are not considered characters
870 such as `◆` or `🦀`. More specifically you can now use any identifier that
871 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
872 is the same standard as languages like Python, however Rust uses NFC
873 normalization which may be different from other languages.
874 - [You can now specify "or patterns" inside pattern matches.][79278]
875 Previously you could only use `|` (OR) on complete patterns. E.g.
879 matches!(x, Some(1) | Some(2));
881 matches!(x, Some(1 | 2));
883 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
884 has the same semantics as the `:pat` matcher. This is to allow `:pat`
885 to change semantics to being a pattern fragment in a future edition.
888 -----------------------
889 - [Updated the minimum external LLVM version to LLVM 10.][83387]
890 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
891 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
893 \* Refer to Rust's [platform support page][platform-support-doc] for more
894 information on Rust's tiered platform support.
897 -----------------------
898 - [Abort messages will now forward to `android_set_abort_message` on
899 Android platforms when available.][81469]
900 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
901 - [Arrays of any length now implement `IntoIterator`.][84147]
902 Currently calling `.into_iter()` as a method on an array will
903 return `impl Iterator<Item=&T>`, but this may change in a
904 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
905 directly on arrays will provide `impl Iterator<Item=T>` as expected.
906 - [`leading_zeros`, and `trailing_zeros` are now available on all
907 `NonZero` integer types.][84082]
908 - [`{f32, f64}::from_str` now parse and print special values
909 (`NaN`, `-0`) according to IEEE 754.][78618]
910 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
911 - [Add the `BITS` associated constant to all numeric types.][82565]
915 - [`AtomicBool::fetch_update`]
916 - [`AtomicPtr::fetch_update`]
917 - [`BTreeMap::retain`]
918 - [`BTreeSet::retain`]
919 - [`BufReader::seek_relative`]
920 - [`DebugStruct::non_exhaustive`]
923 - [`Duration::is_zero`]
924 - [`Duration::saturating_add`]
925 - [`Duration::saturating_mul`]
926 - [`Duration::saturating_sub`]
927 - [`ErrorKind::Unsupported`]
929 - [`Ordering::is_eq`]
930 - [`Ordering::is_ge`]
931 - [`Ordering::is_gt`]
932 - [`Ordering::is_le`]
933 - [`Ordering::is_lt`]
934 - [`Ordering::is_ne`]
935 - [`OsStr::is_ascii`]
936 - [`OsStr::make_ascii_lowercase`]
937 - [`OsStr::make_ascii_uppercase`]
938 - [`OsStr::to_ascii_lowercase`]
939 - [`OsStr::to_ascii_uppercase`]
940 - [`Peekable::peek_mut`]
941 - [`Rc::decrement_strong_count`]
942 - [`Rc::increment_strong_count`]
943 - [`Vec::extend_from_within`]
944 - [`array::from_mut`]
945 - [`array::from_ref`]
946 - [`cmp::max_by_key`]
948 - [`cmp::min_by_key`]
950 - [`f32::is_subnormal`]
951 - [`f64::is_subnormal`]
954 -----------------------
955 - [Cargo now supports git repositories where the default `HEAD` branch is not
956 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
957 which can handle default branches correctly.
958 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
959 - [The `authors` field is no longer included in `Cargo.toml` for new
960 projects.][cargo/9282]
963 -----------------------
964 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
965 without hyperlinks.][81764]
969 - [Implement token-based handling of attributes during expansion][82608]
970 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
971 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
972 to confusion and potential security vulnerabilities and [is no
973 longer recommended][ietf6943].
974 - [The added `BITS` constant may conflict with external definitions.][85667]
975 In particular, this was known to be a problem in the `lexical-core` crate,
976 but they have published fixes for semantic versions 0.4 through 0.7. To
977 update this dependency alone, use `cargo update -p lexical-core`.
978 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
982 These changes provide no direct user facing benefits, but represent significant
983 improvements to the internals and overall performance of rustc and
986 - [Rework the `std::sys::windows::alloc` implementation.][83065]
987 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
988 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
989 - [Rework rustdoc const type][82873]
991 [85667]: https://github.com/rust-lang/rust/pull/85667
992 [83386]: https://github.com/rust-lang/rust/pull/83386
993 [82771]: https://github.com/rust-lang/rust/pull/82771
994 [84147]: https://github.com/rust-lang/rust/pull/84147
995 [84082]: https://github.com/rust-lang/rust/pull/84082
996 [83799]: https://github.com/rust-lang/rust/pull/83799
997 [83681]: https://github.com/rust-lang/rust/pull/83681
998 [83652]: https://github.com/rust-lang/rust/pull/83652
999 [83387]: https://github.com/rust-lang/rust/pull/83387
1000 [82873]: https://github.com/rust-lang/rust/pull/82873
1001 [82864]: https://github.com/rust-lang/rust/pull/82864
1002 [82608]: https://github.com/rust-lang/rust/pull/82608
1003 [82565]: https://github.com/rust-lang/rust/pull/82565
1004 [80525]: https://github.com/rust-lang/rust/pull/80525
1005 [79278]: https://github.com/rust-lang/rust/pull/79278
1006 [78618]: https://github.com/rust-lang/rust/pull/78618
1007 [77704]: https://github.com/rust-lang/rust/pull/77704
1008 [83941]: https://github.com/rust-lang/rust/pull/83941
1009 [83065]: https://github.com/rust-lang/rust/pull/83065
1010 [81764]: https://github.com/rust-lang/rust/pull/81764
1011 [81469]: https://github.com/rust-lang/rust/pull/81469
1012 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1013 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1014 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1015 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1016 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1017 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1018 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1019 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1020 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1021 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1022 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1023 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1024 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1025 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1026 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1027 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1028 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1029 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1030 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1031 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1032 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1033 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1034 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1035 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1036 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1037 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1038 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1039 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1040 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1041 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1042 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1043 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1044 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1045 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1046 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1047 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1048 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1049 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1050 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1051 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1052 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1055 Version 1.52.1 (2021-05-10)
1056 ============================
1058 This release disables incremental compilation, unless the user has explicitly
1059 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1061 This is due to the widespread, and frequently occuring, breakage encountered by
1062 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1063 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1064 newly added incremental verification are still present in past stable versions,
1065 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1068 These problems only affect incremental builds, so release builds with Cargo
1069 should not be affected unless the user has explicitly opted into incremental.
1070 Debug and check builds are affected.
1072 See [84970] for more details.
1074 [84970]: https://github.com/rust-lang/rust/issues/84970
1076 Version 1.52.0 (2021-05-06)
1077 ============================
1081 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1082 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1083 is allowed by default, and may become a warning or hard error in a
1085 - [You can now cast mutable references to arrays to a pointer of the same type as
1086 the element.][81479]
1090 - [Upgraded the default LLVM to LLVM 12.][81451]
1092 Added tier 3\* support for the following targets.
1094 - [`s390x-unknown-linux-musl`][82166]
1095 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1096 - [`powerpc-unknown-openbsd`][82733]
1098 \* Refer to Rust's [platform support page][platform-support-doc] for more
1099 information on Rust's tiered platform support.
1103 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1104 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1105 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1106 - [All integer division and remainder operations are now `const`.][80962]
1110 - [`Arguments::as_str`]
1112 - [`char::REPLACEMENT_CHARACTER`]
1113 - [`char::UNICODE_VERSION`]
1114 - [`char::decode_utf16`]
1115 - [`char::from_digit`]
1116 - [`char::from_u32_unchecked`]
1117 - [`char::from_u32`]
1118 - [`slice::partition_point`]
1119 - [`str::rsplit_once`]
1120 - [`str::split_once`]
1122 The following previously stable APIs are now `const`.
1124 - [`char::len_utf8`]
1125 - [`char::len_utf16`]
1126 - [`char::to_ascii_uppercase`]
1127 - [`char::to_ascii_lowercase`]
1128 - [`char::eq_ignore_ascii_case`]
1129 - [`u8::to_ascii_uppercase`]
1130 - [`u8::to_ascii_lowercase`]
1131 - [`u8::eq_ignore_ascii_case`]
1135 - [Rustdoc lints are now treated as a tool lint, meaning that
1136 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1137 Using the old style is still allowed, and will become a warning in
1139 - [Rustdoc now supports argument files.][82261]
1140 - [Rustdoc now generates smart punctuation for documentation.][79423]
1141 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1149 - [You can now pass multiple filters to tests.][81356] E.g.
1150 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1151 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1152 allowing you to see `std` symbols when debugging.][82218]
1156 These changes provide no direct user facing benefits, but represent significant
1157 improvements to the internals and overall performance of rustc and
1160 - [Check the result cache before the DepGraph when ensuring queries][81855]
1161 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1162 - [Only store a LocalDefId in some HIR nodes][81611]
1163 - [Store HIR attributes in a side table][79519]
1167 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1168 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1169 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1170 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1171 languages in code blocks.][78429]
1172 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1173 - [Changes in how proc macros handle whitespace may lead to panics when used
1174 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1175 - [Turn `#[derive]` into a regular macro attribute][79078]
1177 [84136]: https://github.com/rust-lang/rust/issues/84136
1178 [80763]: https://github.com/rust-lang/rust/pull/80763
1179 [82166]: https://github.com/rust-lang/rust/pull/82166
1180 [82121]: https://github.com/rust-lang/rust/pull/82121
1181 [81879]: https://github.com/rust-lang/rust/pull/81879
1182 [82261]: https://github.com/rust-lang/rust/pull/82261
1183 [82218]: https://github.com/rust-lang/rust/pull/82218
1184 [82216]: https://github.com/rust-lang/rust/pull/82216
1185 [82202]: https://github.com/rust-lang/rust/pull/82202
1186 [81855]: https://github.com/rust-lang/rust/pull/81855
1187 [81766]: https://github.com/rust-lang/rust/pull/81766
1188 [81744]: https://github.com/rust-lang/rust/pull/81744
1189 [81611]: https://github.com/rust-lang/rust/pull/81611
1190 [81479]: https://github.com/rust-lang/rust/pull/81479
1191 [81451]: https://github.com/rust-lang/rust/pull/81451
1192 [81356]: https://github.com/rust-lang/rust/pull/81356
1193 [80962]: https://github.com/rust-lang/rust/pull/80962
1194 [80553]: https://github.com/rust-lang/rust/pull/80553
1195 [80527]: https://github.com/rust-lang/rust/pull/80527
1196 [79519]: https://github.com/rust-lang/rust/pull/79519
1197 [79423]: https://github.com/rust-lang/rust/pull/79423
1198 [79208]: https://github.com/rust-lang/rust/pull/79208
1199 [78429]: https://github.com/rust-lang/rust/pull/78429
1200 [82733]: https://github.com/rust-lang/rust/pull/82733
1201 [82594]: https://github.com/rust-lang/rust/pull/82594
1202 [79078]: https://github.com/rust-lang/rust/pull/79078
1203 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1204 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1205 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1206 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1207 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1208 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1209 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1210 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1211 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1212 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1213 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1214 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1215 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1216 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1217 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1218 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1219 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1220 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1221 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1222 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1223 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1224 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1226 Version 1.51.0 (2021-03-25)
1227 ============================
1231 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1232 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1233 E.g. you can now write the following. Note: Only values of primitive integers,
1234 `bool`, or `char` types are currently permitted.
1236 struct GenericArray<T, const LENGTH: usize> {
1240 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1241 const fn last(&self) -> Option<&T> {
1245 Some(&self.inner[LENGTH - 1])
1255 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1256 This option controls whether debug information is split across multiple files
1257 or packed into a single file. **Note** This option is unstable on other platforms.
1258 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1259 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1260 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1261 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1263 \* Refer to Rust's [platform support page][platform-support-doc] for more
1264 information on Rust's tiered platform support.
1269 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1270 - [`str` now implements `AsMut<str>`.][80279]
1271 - [`u64` and `u128` now implement `From<char>`.][79502]
1272 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1273 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1274 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1275 - [`io::Empty` now implements `io::Seek`.][78044]
1276 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1277 `T: ?Sized` types.][80764]
1278 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1284 - [`Arc::decrement_strong_count`]
1285 - [`Arc::increment_strong_count`]
1286 - [`Once::call_once_force`]
1287 - [`Peekable::next_if_eq`]
1288 - [`Peekable::next_if`]
1289 - [`Seek::stream_position`]
1290 - [`array::IntoIter`]
1291 - [`panic::panic_any`]
1293 - [`ptr::addr_of_mut!`]
1294 - [`slice::fill_with`]
1295 - [`slice::split_inclusive_mut`]
1296 - [`slice::split_inclusive`]
1297 - [`slice::strip_prefix`]
1298 - [`slice::strip_suffix`]
1299 - [`str::split_inclusive`]
1300 - [`sync::OnceState`]
1302 - [`VecDeque::range`]
1303 - [`VecDeque::range_mut`]
1307 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1308 codegen option.][cargo/9112]
1309 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1310 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1311 to avoid unifying features of dependencies where that unification could be unwanted.
1312 Such as using the same dependency with a `std` feature in a build scripts and
1313 proc-macros, while using the `no-std` feature in the final binary. See the
1314 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1319 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1320 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1321 documentation.][79642]
1323 Various improvements to intra-doc links:
1325 - [You can link to non-path primitives such as `slice`.][80181]
1326 - [You can link to associated items.][74489]
1327 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1331 - [You can now pass `--include-ignored` to tests (e.g. with
1332 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1337 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1338 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1340 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1341 for the distributed artifacts.][81521]
1342 - `armv5te-unknown-linux-gnueabi`
1343 - `sparc64-unknown-linux-gnu`
1344 - `thumbv7neon-unknown-linux-gnueabihf`
1345 - `armv7-unknown-linux-gnueabi`
1346 - `x86_64-unknown-linux-gnux32`
1347 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1352 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1354 [79135]: https://github.com/rust-lang/rust/pull/79135
1355 [74489]: https://github.com/rust-lang/rust/pull/74489
1356 [76934]: https://github.com/rust-lang/rust/pull/76934
1357 [79570]: https://github.com/rust-lang/rust/pull/79570
1358 [80181]: https://github.com/rust-lang/rust/pull/80181
1359 [79642]: https://github.com/rust-lang/rust/pull/79642
1360 [80945]: https://github.com/rust-lang/rust/pull/80945
1361 [80279]: https://github.com/rust-lang/rust/pull/80279
1362 [80053]: https://github.com/rust-lang/rust/pull/80053
1363 [79502]: https://github.com/rust-lang/rust/pull/79502
1364 [75180]: https://github.com/rust-lang/rust/pull/75180
1365 [81521]: https://github.com/rust-lang/rust/pull/81521
1366 [80968]: https://github.com/rust-lang/rust/pull/80968
1367 [80959]: https://github.com/rust-lang/rust/pull/80959
1368 [80718]: https://github.com/rust-lang/rust/pull/80718
1369 [80653]: https://github.com/rust-lang/rust/pull/80653
1370 [80579]: https://github.com/rust-lang/rust/pull/80579
1371 [79998]: https://github.com/rust-lang/rust/pull/79998
1372 [78044]: https://github.com/rust-lang/rust/pull/78044
1373 [81455]: https://github.com/rust-lang/rust/pull/81455
1374 [80764]: https://github.com/rust-lang/rust/pull/80764
1375 [80749]: https://github.com/rust-lang/rust/pull/80749
1376 [80662]: https://github.com/rust-lang/rust/pull/80662
1377 [79134]: https://github.com/rust-lang/rust/pull/79134
1378 [80966]: https://github.com/rust-lang/rust/pull/80966
1379 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1380 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1381 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1382 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1383 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1384 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1385 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1386 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1387 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1388 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1389 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1390 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1391 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1392 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1393 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1394 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1395 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1396 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1397 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1398 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1399 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1400 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1401 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1403 Version 1.50.0 (2021-02-11)
1404 ============================
1407 -----------------------
1408 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1409 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1410 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1413 -----------------------
1414 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1415 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1416 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1417 - [Dropped support for all cloudabi targets.][78439]
1419 \* Refer to Rust's [platform support page][platform-support-doc] for more
1420 information on Rust's tiered platform support.
1423 -----------------------
1425 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1426 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1427 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1428 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1429 up the same amount of space as `File`.
1435 - [`btree_map::Entry::or_insert_with_key`]
1438 - [`hash_map::Entry::or_insert_with_key`]
1442 - [`UnsafeCell::get_mut`]
1444 The following previously stable methods are now `const`.
1446 - [`IpAddr::is_ipv4`]
1447 - [`IpAddr::is_ipv6`]
1448 - [`IpAddr::is_unspecified`]
1449 - [`IpAddr::is_loopback`]
1450 - [`IpAddr::is_multicast`]
1451 - [`Ipv4Addr::octets`]
1452 - [`Ipv4Addr::is_loopback`]
1453 - [`Ipv4Addr::is_private`]
1454 - [`Ipv4Addr::is_link_local`]
1455 - [`Ipv4Addr::is_multicast`]
1456 - [`Ipv4Addr::is_broadcast`]
1457 - [`Ipv4Addr::is_documentation`]
1458 - [`Ipv4Addr::to_ipv6_compatible`]
1459 - [`Ipv4Addr::to_ipv6_mapped`]
1460 - [`Ipv6Addr::segments`]
1461 - [`Ipv6Addr::is_unspecified`]
1462 - [`Ipv6Addr::is_loopback`]
1463 - [`Ipv6Addr::is_multicast`]
1464 - [`Ipv6Addr::to_ipv4`]
1467 - [`Layout::from_size_align`]
1468 - `pow` for all integer types.
1469 - `checked_pow` for all integer types.
1470 - `saturating_pow` for all integer types.
1471 - `wrapping_pow` for all integer types.
1472 - `next_power_of_two` for all unsigned integer types.
1473 - `checked_next_power_of_two` for all unsigned integer types.
1476 -----------------------
1478 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1479 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1480 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1481 contents of that directory for changes.][cargo/8973]
1482 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1487 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1488 - [Running tests will now print the total time taken to execute.][75752]
1493 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1494 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1495 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1496 unhygenic `macro_rules!` macros.][79472]
1497 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1498 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1499 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1500 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1501 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1502 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1504 [74989]: https://github.com/rust-lang/rust/pull/74989
1505 [79261]: https://github.com/rust-lang/rust/pull/79261
1506 [79896]: https://github.com/rust-lang/rust/pull/79896
1507 [79484]: https://github.com/rust-lang/rust/pull/79484
1508 [79472]: https://github.com/rust-lang/rust/pull/79472
1509 [79270]: https://github.com/rust-lang/rust/pull/79270
1510 [79003]: https://github.com/rust-lang/rust/pull/79003
1511 [78864]: https://github.com/rust-lang/rust/pull/78864
1512 [78636]: https://github.com/rust-lang/rust/pull/78636
1513 [78439]: https://github.com/rust-lang/rust/pull/78439
1514 [78343]: https://github.com/rust-lang/rust/pull/78343
1515 [78296]: https://github.com/rust-lang/rust/pull/78296
1516 [78068]: https://github.com/rust-lang/rust/pull/78068
1517 [75752]: https://github.com/rust-lang/rust/pull/75752
1518 [74699]: https://github.com/rust-lang/rust/pull/74699
1519 [78142]: https://github.com/rust-lang/rust/pull/78142
1520 [77484]: https://github.com/rust-lang/rust/pull/77484
1521 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1522 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1523 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1524 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1525 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1526 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1527 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1528 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1529 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1530 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1531 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1532 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1533 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1534 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1535 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1536 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1537 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1538 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1539 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1540 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1541 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1542 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1543 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1544 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1545 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1546 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1547 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1548 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1549 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1550 [`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
1551 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1552 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1553 [`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
1554 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1557 Version 1.49.0 (2020-12-31)
1558 ============================
1561 -----------------------
1563 - [Unions can now implement `Drop`, and you can now have a field in a union
1564 with `ManuallyDrop<T>`.][77547]
1565 - [You can now cast uninhabited enums to integers.][76199]
1566 - [You can now bind by reference and by move in patterns.][76119] This
1567 allows you to selectively borrow individual components of a type. E.g.
1575 let person = Person {
1576 name: String::from("Alice"),
1580 // `name` is moved out of person, but `age` is referenced.
1581 let Person { name, ref age } = person;
1582 println!("{} {}", name, age);
1586 -----------------------
1588 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1589 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1590 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1591 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1592 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1593 - [Output from threads spawned in tests is now captured.][78227]
1594 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1596 \* Refer to Rust's [platform support page][platform-support-doc] for more
1597 information on Rust's tiered platform support.
1600 -----------------------
1602 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1603 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1608 - [`slice::select_nth_unstable`]
1609 - [`slice::select_nth_unstable_by`]
1610 - [`slice::select_nth_unstable_by_key`]
1612 The following previously stable methods are now `const`.
1614 - [`Poll::is_ready`]
1615 - [`Poll::is_pending`]
1618 -----------------------
1619 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1620 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1621 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1622 variable will be set if the crate being built is one the user selected to build, either
1623 with `-p` or through defaults.
1624 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1630 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1631 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1632 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1633 Previously such invalid or unused attributes could be ignored.
1634 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1635 read [this post about the changes][rustdoc-ws-post] for more details.
1636 - [Trait bounds are no longer inferred for associated types.][79904]
1640 These changes provide no direct user facing benefits, but represent significant
1641 improvements to the internals and overall performance of rustc and
1644 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1645 Local Storage model.][78201]
1646 - [Calculate visibilities once in resolve.][78077]
1647 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1648 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1651 [75991]: https://github.com/rust-lang/rust/pull/75991
1652 [78951]: https://github.com/rust-lang/rust/pull/78951
1653 [78848]: https://github.com/rust-lang/rust/pull/78848
1654 [78746]: https://github.com/rust-lang/rust/pull/78746
1655 [78376]: https://github.com/rust-lang/rust/pull/78376
1656 [78228]: https://github.com/rust-lang/rust/pull/78228
1657 [78227]: https://github.com/rust-lang/rust/pull/78227
1658 [78201]: https://github.com/rust-lang/rust/pull/78201
1659 [78109]: https://github.com/rust-lang/rust/pull/78109
1660 [78077]: https://github.com/rust-lang/rust/pull/78077
1661 [77997]: https://github.com/rust-lang/rust/pull/77997
1662 [77703]: https://github.com/rust-lang/rust/pull/77703
1663 [77547]: https://github.com/rust-lang/rust/pull/77547
1664 [77015]: https://github.com/rust-lang/rust/pull/77015
1665 [76199]: https://github.com/rust-lang/rust/pull/76199
1666 [76119]: https://github.com/rust-lang/rust/pull/76119
1667 [75914]: https://github.com/rust-lang/rust/pull/75914
1668 [79004]: https://github.com/rust-lang/rust/pull/79004
1669 [78676]: https://github.com/rust-lang/rust/pull/78676
1670 [79904]: https://github.com/rust-lang/rust/issues/79904
1671 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1672 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1673 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1674 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1675 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1676 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1677 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1678 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1679 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1680 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1682 Version 1.48.0 (2020-11-19)
1683 ==========================
1688 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1689 is still rejected *semantically*, but can now be parsed by procedural macros.
1693 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1694 `rustc` whether to link its own C runtime and libraries or to rely on a external
1695 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1696 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1697 Note: If you're using cargo you must explicitly pass the `--target` flag.
1698 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1700 \* Refer to Rust's [platform support page][platform-support-doc] for more
1701 information on Rust's tiered platform support.
1705 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1706 and `&Stderr`.][76275]
1707 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1708 - [The `matches!` macro now supports having a trailing comma.][74880]
1709 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1710 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1714 - [`slice::as_ptr_range`]
1715 - [`slice::as_mut_ptr_range`]
1716 - [`VecDeque::make_contiguous`]
1717 - [`future::pending`]
1720 The following previously stable methods are now `const fn`'s:
1722 - [`Option::is_some`]
1723 - [`Option::is_none`]
1724 - [`Option::as_ref`]
1726 - [`Result::is_err`]
1727 - [`Result::as_ref`]
1728 - [`Ordering::reverse`]
1729 - [`Ordering::then`]
1736 - [You can now link to items in `rustdoc` using the intra-doc link
1737 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1738 a link to `std::future`'s documentation. See ["Linking to items by
1739 name"][intradoc-links] for more information.
1740 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1741 when searching through `rustdoc`'s UI.][75740]
1745 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1746 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1747 promoted to `'static` lifetime any more inside `const fn`s.
1748 - [Associated type bindings on trait objects are now verified to meet the bounds
1749 declared on the trait when checking that they implement the trait.][27675]
1750 - [When trait bounds on associated types or opaque types are ambiguous, the
1751 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1752 - [Fixed recursive nonterminals not being expanded in macros during
1753 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1754 correctly handling recursive nonterminal tokens.
1755 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1756 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1757 in places where they have no effect.][73461]
1758 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1759 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1760 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1761 disallow zero-initialization.][71274]
1762 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1763 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1764 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1765 see the [`catch_unwind`] documentation for further information.
1771 These changes provide no direct user facing benefits, but represent significant
1772 improvements to the internals and overall performance of rustc and
1775 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1776 You can continue building with `make` by setting `ninja=false` in
1778 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1779 - [Made `ensure_sufficient_stack()` non-generic][76680]
1781 [78143]: https://github.com/rust-lang/rust/issues/78143
1782 [76680]: https://github.com/rust-lang/rust/pull/76680/
1783 [76030]: https://github.com/rust-lang/rust/pull/76030/
1784 [70212]: https://github.com/rust-lang/rust/pull/70212/
1785 [27675]: https://github.com/rust-lang/rust/issues/27675/
1786 [54121]: https://github.com/rust-lang/rust/issues/54121/
1787 [71274]: https://github.com/rust-lang/rust/pull/71274/
1788 [77386]: https://github.com/rust-lang/rust/pull/77386/
1789 [77153]: https://github.com/rust-lang/rust/pull/77153/
1790 [77055]: https://github.com/rust-lang/rust/pull/77055/
1791 [76275]: https://github.com/rust-lang/rust/pull/76275/
1792 [76310]: https://github.com/rust-lang/rust/pull/76310/
1793 [76420]: https://github.com/rust-lang/rust/pull/76420/
1794 [76158]: https://github.com/rust-lang/rust/pull/76158/
1795 [75857]: https://github.com/rust-lang/rust/pull/75857/
1796 [75585]: https://github.com/rust-lang/rust/pull/75585/
1797 [75740]: https://github.com/rust-lang/rust/pull/75740/
1798 [75502]: https://github.com/rust-lang/rust/pull/75502/
1799 [74880]: https://github.com/rust-lang/rust/pull/74880/
1800 [74922]: https://github.com/rust-lang/rust/pull/74922/
1801 [74430]: https://github.com/rust-lang/rust/pull/74430/
1802 [74194]: https://github.com/rust-lang/rust/pull/74194/
1803 [73461]: https://github.com/rust-lang/rust/pull/73461/
1804 [73166]: https://github.com/rust-lang/rust/pull/73166/
1805 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1806 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1807 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1808 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1809 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1810 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1811 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1812 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1813 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1814 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1815 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1816 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1817 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1818 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1819 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1822 Version 1.47.0 (2020-10-08)
1823 ==========================
1827 - [Closures will now warn when not used.][74869]
1831 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1832 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1834 - [Upgraded to LLVM 11.][73526]
1835 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1836 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1837 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1839 \* Refer to Rust's [platform support page][platform-support-doc] for more
1840 information on Rust's tiered platform support.
1844 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1845 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1846 those of length less than 33.][74060]
1847 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1848 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1849 `PartialEq`, and `PartialOrd`.][73583]
1853 - [`Ident::new_raw`]
1854 - [`Range::is_empty`]
1855 - [`RangeInclusive::is_empty`]
1856 - [`Result::as_deref`]
1857 - [`Result::as_deref_mut`]
1859 - [`pointer::offset_from`]
1863 The following previously stable APIs have now been made const.
1865 - [The `new` method for all `NonZero` integers.][73858]
1866 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1867 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1868 methods for all integers.][73858]
1869 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1870 signed integers.][73858]
1871 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1872 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1873 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1874 `is_ascii_control` methods for `char` and `u8`.][73858]
1878 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1879 You can override this by setting the following in your `Cargo.toml`.
1881 [profile.release.build-override]
1884 - [`cargo-help` will now display man pages for commands rather just the
1885 `--help` text.][cargo/8456]
1886 - [`cargo-metadata` now emits a `test` field indicating if a target has
1887 tests enabled.][cargo/8478]
1888 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1889 - [`cargo-publish` will now use an alternative registry by default if it's the
1890 only registry specified in `package.publish`.][cargo/8571]
1894 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1895 type based search.][75366]
1896 - [Added the Ayu theme to rustdoc.][71237]
1900 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1901 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1902 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1903 help to preserve more span information.][73084] These changes may cause
1904 compiliation errors if your macro was unhygenic or didn't correctly handle
1906 - [Moved support for the CloudABI target to tier 3.][75568]
1907 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1908 - [Added the `rustc-docs` component.][75560] This allows you to install
1909 and read the documentation for the compiler internal APIs. (Currently only
1910 available for `x86_64-unknown-linux-gnu`.)
1915 - [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.
1917 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1918 [75048]: https://github.com/rust-lang/rust/pull/75048/
1919 [74163]: https://github.com/rust-lang/rust/pull/74163/
1920 [71237]: https://github.com/rust-lang/rust/pull/71237/
1921 [74869]: https://github.com/rust-lang/rust/pull/74869/
1922 [73858]: https://github.com/rust-lang/rust/pull/73858/
1923 [75716]: https://github.com/rust-lang/rust/pull/75716/
1924 [75560]: https://github.com/rust-lang/rust/pull/75560/
1925 [75568]: https://github.com/rust-lang/rust/pull/75568/
1926 [75366]: https://github.com/rust-lang/rust/pull/75366/
1927 [75204]: https://github.com/rust-lang/rust/pull/75204/
1928 [74650]: https://github.com/rust-lang/rust/pull/74650/
1929 [74419]: https://github.com/rust-lang/rust/pull/74419/
1930 [73964]: https://github.com/rust-lang/rust/pull/73964/
1931 [74021]: https://github.com/rust-lang/rust/pull/74021/
1932 [74060]: https://github.com/rust-lang/rust/pull/74060/
1933 [73893]: https://github.com/rust-lang/rust/pull/73893/
1934 [73526]: https://github.com/rust-lang/rust/pull/73526/
1935 [73583]: https://github.com/rust-lang/rust/pull/73583/
1936 [73084]: https://github.com/rust-lang/rust/pull/73084/
1937 [73197]: https://github.com/rust-lang/rust/pull/73197/
1938 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1939 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1940 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1941 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1942 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1943 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1944 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1945 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1946 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1947 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1948 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1949 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1950 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1951 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1954 Version 1.46.0 (2020-08-27)
1955 ==========================
1959 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1960 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1961 const functions.][73862]
1962 - [The `#[track_caller]` attribute can now be added to functions to use the
1963 function's caller's location information for panic messages.][72445]
1964 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1965 `x.0.0` over `(x.0).0`.
1966 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1967 You currently can't use `mem::transmute` in constant functions.
1971 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1972 - [Enabled static "Position Independent Executables" by default
1973 for `x86_64-unknown-linux-musl`.][70740]
1977 - [`mem::forget` is now a `const fn`.][73887]
1978 - [`String` now implements `From<char>`.][73466]
1979 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1980 integer types.][73032]
1981 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1982 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1983 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1984 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1985 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1986 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1991 - [`vec::Drain::as_slice`]
1995 Added a number of new environment variables that are now available when
1996 compiling your crate.
1998 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1999 the specific binary being compiled and the name of the crate.
2000 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2001 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2005 - [The target configuration option `abi_blacklist` has been renamed
2006 to `unsupported_abis`.][74150] The old name will still continue to work.
2007 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2008 This was previously accepted but will become a hard error in a future release.
2009 - [Rustc will fail to compile if you have a struct with
2010 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2012 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2013 ensure that spans have the correct information, and may cause breakage if you
2014 were relying on receiving spans with dummy information.
2015 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2016 a legacy installer that was replaced by a MSI installer a few years ago but
2017 was still being built.
2018 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2019 - [Rustc will no longer accept overlapping trait implementations that only
2020 differ in how the lifetime was bound.][72493]
2021 - [Rustc now correctly relates the lifetime of an existential associated
2022 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2023 you to pass a shorter lifetime than expected.
2024 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2025 The library will need to be installed for `rustc` to work, even though we
2026 expect it to be already available on most systems.
2027 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2029 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2030 exact output returned by rustc's pretty printing is an unstable
2031 implementation detail: we recommend any macro relying on it to switch to a
2032 more robust parsing system.
2034 [75453]: https://github.com/rust-lang/rust/issues/75453/
2035 [74820]: https://github.com/rust-lang/rust/issues/74820/
2036 [74420]: https://github.com/rust-lang/rust/issues/74420/
2037 [74109]: https://github.com/rust-lang/rust/pull/74109/
2038 [74150]: https://github.com/rust-lang/rust/pull/74150/
2039 [73862]: https://github.com/rust-lang/rust/pull/73862/
2040 [73887]: https://github.com/rust-lang/rust/pull/73887/
2041 [73466]: https://github.com/rust-lang/rust/pull/73466/
2042 [73516]: https://github.com/rust-lang/rust/pull/73516/
2043 [73293]: https://github.com/rust-lang/rust/pull/73293/
2044 [73007]: https://github.com/rust-lang/rust/pull/73007/
2045 [73032]: https://github.com/rust-lang/rust/pull/73032/
2046 [72920]: https://github.com/rust-lang/rust/pull/72920/
2047 [72569]: https://github.com/rust-lang/rust/pull/72569/
2048 [72583]: https://github.com/rust-lang/rust/pull/72583/
2049 [72584]: https://github.com/rust-lang/rust/pull/72584/
2050 [72717]: https://github.com/rust-lang/rust/pull/72717/
2051 [72437]: https://github.com/rust-lang/rust/pull/72437/
2052 [72445]: https://github.com/rust-lang/rust/pull/72445/
2053 [72486]: https://github.com/rust-lang/rust/pull/72486/
2054 [72493]: https://github.com/rust-lang/rust/pull/72493/
2055 [72331]: https://github.com/rust-lang/rust/pull/72331/
2056 [71896]: https://github.com/rust-lang/rust/pull/71896/
2057 [71660]: https://github.com/rust-lang/rust/pull/71660/
2058 [71322]: https://github.com/rust-lang/rust/pull/71322/
2059 [70740]: https://github.com/rust-lang/rust/pull/70740/
2060 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2061 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2062 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2063 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2064 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2067 Version 1.45.2 (2020-08-03)
2068 ==========================
2070 * [Fix bindings in tuple struct patterns][74954]
2071 * [Fix track_caller integration with trait objects][74784]
2073 [74954]: https://github.com/rust-lang/rust/issues/74954
2074 [74784]: https://github.com/rust-lang/rust/issues/74784
2077 Version 1.45.1 (2020-07-30)
2078 ==========================
2080 * [Fix const propagation with references.][73613]
2081 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2082 * [Avoid spurious implicit region bound.][74509]
2083 * [Install clippy on x.py install][74457]
2085 [73613]: https://github.com/rust-lang/rust/pull/73613
2086 [73078]: https://github.com/rust-lang/rust/issues/73078
2087 [74509]: https://github.com/rust-lang/rust/pull/74509
2088 [74457]: https://github.com/rust-lang/rust/pull/74457
2091 Version 1.45.0 (2020-07-16)
2092 ==========================
2096 - [Out of range float to int conversions using `as` has been defined as a saturating
2097 conversion.][71269] This was previously undefined behaviour, but you can use the
2098 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2099 may be desirable in rare performance sensitive situations.
2100 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2101 using `u64`.][70705]
2102 - [Function like procedural macros can now be used in expression, pattern, and statement
2103 positions.][68717] This means you can now use a function-like procedural macro
2104 anywhere you can use a declarative (`macro_rules!`) macro.
2108 - [You can now override individual target features through the `target-feature`
2109 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2110 equivalent to `-C target-feature=+avx2,+fma`.
2111 - [Added the `force-unwind-tables` flag.][69984] This option allows
2112 rustc to always generate unwind tables regardless of panic strategy.
2113 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2114 to include LLVM bitcode into generated `rlib`s (this is on by default).
2115 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2116 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2117 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2118 - [Upgraded to LLVM 10.][67759]
2120 \* Refer to Rust's [platform support page][platform-support-doc] for more
2121 information on Rust's tiered platform support.
2126 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2128 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2129 - [You can now use `char` with
2130 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2131 a range of codepoints.][72413] E.g.
2132 you can now write the following;
2134 for ch in 'a'..='z' {
2138 // Prints "abcdefghijklmnopqrstuvwxyz"
2140 - [`OsString` now implements `FromStr`.][71662]
2141 - [The `saturating_neg` method has been added to all signed integer primitive
2142 types, and the `saturating_abs` method has been added for all integer
2143 primitive types.][71886]
2144 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2145 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2147 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2148 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2149 integer types.][69813]
2150 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2151 integer types.][72324]
2152 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2157 - [`BTreeMap::remove_entry`]
2159 - [`rc::Weak::as_ptr`]
2160 - [`rc::Weak::from_raw`]
2161 - [`rc::Weak::into_raw`]
2162 - [`str::strip_prefix`]
2163 - [`str::strip_suffix`]
2164 - [`sync::Weak::as_ptr`]
2165 - [`sync::Weak::from_raw`]
2166 - [`sync::Weak::into_raw`]
2167 - [`char::UNICODE_VERSION`]
2168 - [`Span::resolved_at`]
2169 - [`Span::located_at`]
2170 - [`Span::mixed_site`]
2171 - [`unix::process::CommandExt::arg0`]
2176 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2181 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2182 `~~outdated information~~` becomes "~~outdated information~~".
2183 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2187 - [Trying to self initialize a static value (that is creating a value using
2188 itself) is unsound and now causes a compile error.][71140]
2189 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2190 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2191 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2192 previously undocumented and not intended for public use. Rustdoc still provides
2193 a non-zero exit code on errors.
2194 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2195 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2196 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2197 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2198 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2202 - [Make clippy a git subtree instead of a git submodule][70655]
2203 - [Unify the undo log of all snapshot types][69464]
2205 [71848]: https://github.com/rust-lang/rust/issues/71848/
2206 [73420]: https://github.com/rust-lang/rust/issues/73420/
2207 [72324]: https://github.com/rust-lang/rust/pull/72324/
2208 [71843]: https://github.com/rust-lang/rust/pull/71843/
2209 [71886]: https://github.com/rust-lang/rust/pull/71886/
2210 [72234]: https://github.com/rust-lang/rust/pull/72234/
2211 [72239]: https://github.com/rust-lang/rust/pull/72239/
2212 [72397]: https://github.com/rust-lang/rust/pull/72397/
2213 [72413]: https://github.com/rust-lang/rust/pull/72413/
2214 [72014]: https://github.com/rust-lang/rust/pull/72014/
2215 [72062]: https://github.com/rust-lang/rust/pull/72062/
2216 [72094]: https://github.com/rust-lang/rust/pull/72094/
2217 [72133]: https://github.com/rust-lang/rust/pull/72133/
2218 [67759]: https://github.com/rust-lang/rust/pull/67759/
2219 [71900]: https://github.com/rust-lang/rust/pull/71900/
2220 [71928]: https://github.com/rust-lang/rust/pull/71928/
2221 [71662]: https://github.com/rust-lang/rust/pull/71662/
2222 [71716]: https://github.com/rust-lang/rust/pull/71716/
2223 [71447]: https://github.com/rust-lang/rust/pull/71447/
2224 [71269]: https://github.com/rust-lang/rust/pull/71269/
2225 [71095]: https://github.com/rust-lang/rust/pull/71095/
2226 [71140]: https://github.com/rust-lang/rust/pull/71140/
2227 [70655]: https://github.com/rust-lang/rust/pull/70655/
2228 [70705]: https://github.com/rust-lang/rust/pull/70705/
2229 [69984]: https://github.com/rust-lang/rust/pull/69984/
2230 [69813]: https://github.com/rust-lang/rust/pull/69813/
2231 [69464]: https://github.com/rust-lang/rust/pull/69464/
2232 [68717]: https://github.com/rust-lang/rust/pull/68717/
2233 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2234 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2235 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2236 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2237 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2238 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2239 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2240 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2241 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2242 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2243 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2244 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2245 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2246 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2247 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2248 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2249 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2252 Version 1.44.1 (2020-06-18)
2253 ===========================
2255 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2256 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2257 * [Fix crashes when finding backtrace on macOS.][71397]
2258 * [Clippy applies lint levels into different files.][clippy/5356]
2260 [71397]: https://github.com/rust-lang/rust/issues/71397
2261 [73078]: https://github.com/rust-lang/rust/issues/73078
2262 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2263 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2266 Version 1.44.0 (2020-06-04)
2267 ==========================
2271 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2272 - [Added the `unused_braces` lint.][70081]
2274 **Syntax-only changes**
2276 - [Expansion-driven outline module parsing][69838]
2281 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2286 These are still rejected semantically, so you will likely receive an error but
2287 these changes can be seen and parsed by macros and conditional compilation.
2291 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2292 Additionally when in incremental mode rustc defaults to 256 codegen units.
2293 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2294 a panic is thrown.][67502]
2295 - [Added tier 3\* support for the `aarch64-unknown-none` and
2296 `aarch64-unknown-none-softfloat` targets.][68334]
2297 - [Added tier 3 support for `arm64-apple-tvos` and
2298 `x86_64-apple-tvos` targets.][68191]
2303 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2304 `vec![]` to be able to be used in `const` contexts.
2305 - [`convert::Infallible` now implements `Hash`.][70281]
2306 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2307 a `&mut OsStr`.][70048]
2308 - [Unicode 13 is now supported.][69929]
2309 - [`String` now implements `From<&mut str>`.][69661]
2310 - [`IoSlice` now implements `Copy`.][69403]
2311 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2312 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2313 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2314 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2315 integer types.][69373]
2319 - [`PathBuf::with_capacity`]
2320 - [`PathBuf::capacity`]
2321 - [`PathBuf::clear`]
2322 - [`PathBuf::reserve`]
2323 - [`PathBuf::reserve_exact`]
2324 - [`PathBuf::shrink_to_fit`]
2325 - [`f32::to_int_unchecked`]
2326 - [`f64::to_int_unchecked`]
2327 - [`Layout::align_to`]
2328 - [`Layout::pad_to_align`]
2330 - [`Layout::extend`]
2334 - [Added the `cargo tree` command which will print a tree graph of
2335 your dependencies.][cargo/8062] E.g.
2337 mdbook v0.3.2 (/Users/src/rust/mdbook)
2339 │ ├── html5ever v0.24.0
2341 │ │ │ └── cfg-if v0.1.9
2343 │ │ └── markup5ever v0.9.0
2344 │ │ ├── log v0.4.8 (*)
2346 │ │ │ └── phf_shared v0.7.24
2347 │ │ │ ├── siphasher v0.2.3
2348 │ │ │ └── unicase v1.4.2
2349 │ │ │ [build-dependencies]
2350 │ │ │ └── version_check v0.1.5
2353 You can also display dependencies on multiple versions of the same crate with
2354 `cargo tree -d` (short for `cargo tree --duplicates`).
2358 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2359 the version in the sidebar.][69494]
2363 - [Rustc now correctly generates static libraries on Windows GNU targets with
2364 the `.a` extension, rather than the previous `.lib`.][70937]
2365 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2366 - [The `file_name` property in JSON output of macro errors now points the actual
2367 source file rather than the previous format of `<NAME macros>`.][70969]
2368 **Note:** this may not point to a file that actually exists on the user's system.
2369 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2370 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2371 not allow zero initialization such as `NonZeroU8`.][66059] This was
2372 previously a warning.
2373 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2374 operator has been defined as a saturating operation.][71269] This was previously
2375 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2376 continue using the current behaviour, which may be desirable in rare performance
2377 sensitive situations.
2381 These changes provide no direct user facing benefits, but represent significant
2382 improvements to the internals and overall performance of rustc and
2385 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2386 - [Replace big JS dict with JSON parsing.][71250]
2388 [69373]: https://github.com/rust-lang/rust/pull/69373/
2389 [66059]: https://github.com/rust-lang/rust/pull/66059/
2390 [68191]: https://github.com/rust-lang/rust/pull/68191/
2391 [68899]: https://github.com/rust-lang/rust/pull/68899/
2392 [71147]: https://github.com/rust-lang/rust/pull/71147/
2393 [71250]: https://github.com/rust-lang/rust/pull/71250/
2394 [70937]: https://github.com/rust-lang/rust/pull/70937/
2395 [70969]: https://github.com/rust-lang/rust/pull/70969/
2396 [70632]: https://github.com/rust-lang/rust/pull/70632/
2397 [70281]: https://github.com/rust-lang/rust/pull/70281/
2398 [70345]: https://github.com/rust-lang/rust/pull/70345/
2399 [70048]: https://github.com/rust-lang/rust/pull/70048/
2400 [70081]: https://github.com/rust-lang/rust/pull/70081/
2401 [70156]: https://github.com/rust-lang/rust/pull/70156/
2402 [71269]: https://github.com/rust-lang/rust/pull/71269/
2403 [69838]: https://github.com/rust-lang/rust/pull/69838/
2404 [69929]: https://github.com/rust-lang/rust/pull/69929/
2405 [69661]: https://github.com/rust-lang/rust/pull/69661/
2406 [69778]: https://github.com/rust-lang/rust/pull/69778/
2407 [69494]: https://github.com/rust-lang/rust/pull/69494/
2408 [69403]: https://github.com/rust-lang/rust/pull/69403/
2409 [69033]: https://github.com/rust-lang/rust/pull/69033/
2410 [68692]: https://github.com/rust-lang/rust/pull/68692/
2411 [68334]: https://github.com/rust-lang/rust/pull/68334/
2412 [67502]: https://github.com/rust-lang/rust/pull/67502/
2413 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2414 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2415 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2416 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2417 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2418 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2419 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2420 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2421 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2422 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2423 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2424 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2425 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2428 Version 1.43.1 (2020-05-07)
2429 ===========================
2431 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2432 * [Fixed the stabilization of AVX-512 features.][71473]
2433 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2435 [71430]: https://github.com/rust-lang/rust/pull/71430
2436 [71473]: https://github.com/rust-lang/rust/issues/71473
2437 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2440 Version 1.43.0 (2020-04-23)
2441 ==========================
2445 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2446 the type inferred correctly.][68129]
2447 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2449 **Syntax only changes**
2450 - [Allow `type Foo: Ord` syntactically.][69361]
2451 - [Fuse associated and extern items up to defaultness.][69194]
2452 - [Syntactically allow `self` in all `fn` contexts.][68764]
2453 - [Merge `fn` syntax + cleanup item parsing.][68728]
2454 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2455 For example, you may now write:
2457 macro_rules! mac_trait {
2467 These are still rejected *semantically*, so you will likely receive an error but
2468 these changes can be seen and parsed by macros and
2469 conditional compilation.
2474 - [You can now pass multiple lint flags to rustc to override the previous
2475 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2476 everything in the `unused` lint group except `unused-variables` which
2477 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2478 everything in the `unused` lint group **including** `unused-variables` since
2479 the allow flag is specified before the deny flag (and therefore overridden).
2480 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2481 if they are available on `windows-gnu`.][67429]
2482 - [rustc now buffers errors/warnings printed in JSON.][69227]
2486 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2487 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2488 respectively.][69538] **Note** These conversions are only available when `N`
2490 - [You can now use associated constants on floats and integers directly, rather
2491 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2492 `f32::NAN` with no imports.
2493 - [`u8::is_ascii` is now `const`.][68984]
2494 - [`String` now implements `AsMut<str>`.][68742]
2495 - [Added the `primitive` module to `std` and `core`.][67637] This module
2496 reexports Rust's primitive types. This is mainly useful in macros
2497 where you want avoid these types being shadowed.
2498 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2499 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2503 - [`Once::is_completed`]
2508 - [`iter::once_with`]
2512 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2513 your environment.][cargo/7823]
2514 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2515 executable path when running integration tests or benchmarks.][cargo/7697]
2516 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2517 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2521 - [Certain checks in the `const_err` lint were deemed unrelated to const
2522 evaluation][69185], and have been moved to the `unconditional_panic` and
2523 `arithmetic_overflow` lints.
2528 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2529 has been a warning since 1.36.0.
2530 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2531 led to some instances being accepted, and now correctly emits a hard error.
2533 [69340]: https://github.com/rust-lang/rust/pull/69340
2537 These changes provide no direct user facing benefits, but represent significant
2538 improvements to the internals and overall performance of `rustc` and
2541 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2542 - [Improved how rustc generates drop code.][67332]
2543 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2544 - [traits: preallocate 2 Vecs of known initial size][69022]
2545 - [Avoid exponential behaviour when relating types][68772]
2546 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2547 - [Improve performance of coherence checks][68966]
2548 - [Deduplicate types in the generator witness][68672]
2549 - [Invert control in struct_lint_level.][68725]
2551 [67332]: https://github.com/rust-lang/rust/pull/67332/
2552 [67429]: https://github.com/rust-lang/rust/pull/67429/
2553 [67637]: https://github.com/rust-lang/rust/pull/67637/
2554 [67642]: https://github.com/rust-lang/rust/pull/67642/
2555 [67878]: https://github.com/rust-lang/rust/pull/67878/
2556 [67885]: https://github.com/rust-lang/rust/pull/67885/
2557 [68129]: https://github.com/rust-lang/rust/pull/68129/
2558 [68672]: https://github.com/rust-lang/rust/pull/68672/
2559 [68725]: https://github.com/rust-lang/rust/pull/68725/
2560 [68728]: https://github.com/rust-lang/rust/pull/68728/
2561 [68738]: https://github.com/rust-lang/rust/pull/68738/
2562 [68742]: https://github.com/rust-lang/rust/pull/68742/
2563 [68764]: https://github.com/rust-lang/rust/pull/68764/
2564 [68772]: https://github.com/rust-lang/rust/pull/68772/
2565 [68943]: https://github.com/rust-lang/rust/pull/68943/
2566 [68952]: https://github.com/rust-lang/rust/pull/68952/
2567 [68966]: https://github.com/rust-lang/rust/pull/68966/
2568 [68984]: https://github.com/rust-lang/rust/pull/68984/
2569 [69022]: https://github.com/rust-lang/rust/pull/69022/
2570 [69185]: https://github.com/rust-lang/rust/pull/69185/
2571 [69194]: https://github.com/rust-lang/rust/pull/69194/
2572 [69201]: https://github.com/rust-lang/rust/pull/69201/
2573 [69227]: https://github.com/rust-lang/rust/pull/69227/
2574 [69548]: https://github.com/rust-lang/rust/pull/69548/
2575 [69256]: https://github.com/rust-lang/rust/pull/69256/
2576 [69361]: https://github.com/rust-lang/rust/pull/69361/
2577 [69366]: https://github.com/rust-lang/rust/pull/69366/
2578 [69538]: https://github.com/rust-lang/rust/pull/69538/
2579 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2580 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2581 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2582 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2583 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2584 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2585 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2586 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2589 Version 1.42.0 (2020-03-12)
2590 ==========================
2594 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2596 fn foo(words: &[&str]) {
2598 ["Hello", "World", "!", ..] => println!("Hello World!"),
2599 ["Foo", "Bar", ..] => println!("Baz"),
2600 rest => println!("{:?}", rest),
2604 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2605 that you can create an enum that has the exact layout and ABI of the type
2607 - [You can now use outer attribute procedural macros on inline modules.][64273]
2608 - [There are some *syntax-only* changes:][67131]
2609 - `default` is syntactically allowed before items in `trait` definitions.
2610 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2611 leave out their bodies in favor of `;`.
2612 - Bounds on associated types in `impl`s are now syntactically allowed
2613 (e.g. `type Foo: Ord;`).
2614 - `...` (the C-variadic type) may occur syntactically directly as the type of
2615 any function parameter.
2617 These are still rejected *semantically*, so you will likely receive an error
2618 but these changes can be seen and parsed by procedural macros and
2619 conditional compilation.
2623 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2624 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2625 - [`Option::{expect,unwrap}` and
2626 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2627 pointing to the location where they were called, rather than
2628 `core`'s internals. ][67887]
2630 \* Refer to Rust's [platform support page][platform-support-doc] for more
2631 information on Rust's tiered platform support.
2635 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2636 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2637 to implement `Sized`.][67935]
2638 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2639 - [`Layout::new` is now `const`.][66254]
2640 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2645 - [`CondVar::wait_while`]
2646 - [`CondVar::wait_timeout_while`]
2648 - [`DebugMap::value`]
2649 - [`ManuallyDrop::take`]
2651 - [`ptr::slice_from_raw_parts_mut`]
2652 - [`ptr::slice_from_raw_parts`]
2656 - [You no longer need to include `extern crate proc_macro;` to be able to
2657 `use proc_macro;` in the `2018` edition.][cargo/7700]
2661 - [`Error::description` has been deprecated, and its use will now produce a
2662 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2664 [68253]: https://github.com/rust-lang/rust/pull/68253/
2665 [68348]: https://github.com/rust-lang/rust/pull/68348/
2666 [67935]: https://github.com/rust-lang/rust/pull/67935/
2667 [68339]: https://github.com/rust-lang/rust/pull/68339/
2668 [68122]: https://github.com/rust-lang/rust/pull/68122/
2669 [64273]: https://github.com/rust-lang/rust/pull/64273/
2670 [67712]: https://github.com/rust-lang/rust/pull/67712/
2671 [67887]: https://github.com/rust-lang/rust/pull/67887/
2672 [67131]: https://github.com/rust-lang/rust/pull/67131/
2673 [67233]: https://github.com/rust-lang/rust/pull/67233/
2674 [66899]: https://github.com/rust-lang/rust/pull/66899/
2675 [66919]: https://github.com/rust-lang/rust/pull/66919/
2676 [66254]: https://github.com/rust-lang/rust/pull/66254/
2677 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2678 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2679 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2680 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2681 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2682 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2683 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2684 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2685 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2688 Version 1.41.1 (2020-02-27)
2689 ===========================
2691 * [Always check types of static items][69145]
2692 * [Always check lifetime bounds of `Copy` impls][69145]
2693 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2695 [69225]: https://github.com/rust-lang/rust/issues/69225
2696 [69145]: https://github.com/rust-lang/rust/pull/69145
2699 Version 1.41.0 (2020-01-30)
2700 ===========================
2705 - [You can now pass type parameters to foreign items when implementing
2706 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2707 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2708 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2709 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2710 - [You can now use any valid identifier in a `format_args` macro.][66847]
2711 Previously identifiers starting with an underscore were not allowed.
2712 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2713 enum variants.][66183] These are still rejected semantically, but
2714 can be seen and parsed by procedural macros and conditional compilation.
2715 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2716 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2717 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2719 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2724 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2725 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2726 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2727 - [You can now pass an arguments file passing the `@path` syntax
2728 to rustc.][66172] Note that the format differs somewhat from what is
2729 found in other tooling; please see [the documentation][argfile-docs] for
2731 - [You can now provide `--extern` flag without a path, indicating that it is
2732 available from the search path or specified with an `-L` flag.][64882]
2734 \* Refer to Rust's [platform support page][platform-support-doc] for more
2735 information on Rust's tiered platform support.
2737 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2742 - [The `core::panic` module is now stable.][66771] It was already stable
2744 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2745 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2746 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2751 - [`Result::map_or`]
2752 - [`Result::map_or_else`]
2753 - [`std::rc::Weak::weak_count`]
2754 - [`std::rc::Weak::strong_count`]
2755 - [`std::sync::Weak::weak_count`]
2756 - [`std::sync::Weak::strong_count`]
2761 - [Cargo will now document all the private items for binary crates
2762 by default.][cargo/7593]
2763 - [`cargo-install` will now reinstall the package if it detects that it is out
2764 of date.][cargo/7560]
2765 - [Cargo.lock now uses a more git friendly format that should help to reduce
2766 merge conflicts.][cargo/7579]
2767 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2768 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2769 optimisation level to `2` for debug builds. You can also use
2770 `[profile.<profile>.build-override]` to override build scripts and
2776 - [You can now specify `edition` in documentation code blocks to compile the block
2777 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2778 should be compiled the 2018 edition of Rust.
2779 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2780 current theme with `--check-theme`.][54733]
2781 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2786 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2787 Apple targets.][apple-32bit-drop] This means that the source code is still
2788 available to build, but the targets are no longer being tested and release
2789 binaries for those platforms will no longer be distributed by the Rust project.
2790 Please refer to the linked blog post for more information.
2792 [54733]: https://github.com/rust-lang/rust/pull/54733/
2793 [61351]: https://github.com/rust-lang/rust/pull/61351/
2794 [62514]: https://github.com/rust-lang/rust/pull/62514/
2795 [67255]: https://github.com/rust-lang/rust/pull/67255/
2796 [66661]: https://github.com/rust-lang/rust/pull/66661/
2797 [66771]: https://github.com/rust-lang/rust/pull/66771/
2798 [66847]: https://github.com/rust-lang/rust/pull/66847/
2799 [66238]: https://github.com/rust-lang/rust/pull/66238/
2800 [66277]: https://github.com/rust-lang/rust/pull/66277/
2801 [66325]: https://github.com/rust-lang/rust/pull/66325/
2802 [66172]: https://github.com/rust-lang/rust/pull/66172/
2803 [66183]: https://github.com/rust-lang/rust/pull/66183/
2804 [65879]: https://github.com/rust-lang/rust/pull/65879/
2805 [65013]: https://github.com/rust-lang/rust/pull/65013/
2806 [64882]: https://github.com/rust-lang/rust/pull/64882/
2807 [64325]: https://github.com/rust-lang/rust/pull/64325/
2808 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2809 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2810 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2811 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2812 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2813 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2814 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2815 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2816 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2817 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2818 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2820 Version 1.40.0 (2019-12-19)
2821 ===========================
2825 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2826 `const` contexts.][65188] e.g.
2829 pub struct Point(i32, i32);
2831 const ORIGIN: Point = {
2832 let constructor = Point;
2838 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2839 indicate that there may be variants or fields added in the future.][64639]
2840 For example this requires adding a wild-card branch (`_ => {}`) to any match
2841 statements on a non-exhaustive `enum`. [(RFC 2008)]
2842 - [You can now use function-like procedural macros in `extern` blocks and in
2843 type positions.][63931] e.g. `type Generated = macro!();`
2844 - [Function-like and attribute procedural macros can now emit
2845 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2846 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2847 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2848 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2852 - [Added tier 3 support\* for the
2853 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2854 - [Added tier 3 support for the
2855 `aarch64-unknown-none-softfloat` target.][64589]
2856 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2857 `mips64el-unknown-linux-muslabi64` targets.][65843]
2859 \* Refer to Rust's [platform support page][platform-support-doc] for more
2860 information on Rust's tiered platform support.
2864 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2868 - [`BTreeMap::get_key_value`]
2869 - [`HashMap::get_key_value`]
2870 - [`Option::as_deref_mut`]
2871 - [`Option::as_deref`]
2872 - [`Option::flatten`]
2873 - [`UdpSocket::peer_addr`]
2874 - [`f32::to_be_bytes`]
2875 - [`f32::to_le_bytes`]
2876 - [`f32::to_ne_bytes`]
2877 - [`f64::to_be_bytes`]
2878 - [`f64::to_le_bytes`]
2879 - [`f64::to_ne_bytes`]
2880 - [`f32::from_be_bytes`]
2881 - [`f32::from_le_bytes`]
2882 - [`f32::from_ne_bytes`]
2883 - [`f64::from_be_bytes`]
2884 - [`f64::from_le_bytes`]
2885 - [`f64::from_ne_bytes`]
2892 - [Cargo will now always display warnings, rather than only on
2893 fresh builds.][cargo/7450]
2894 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2895 now produce an error.][cargo/7507] Previously these flags were ignored.
2896 - [You can now publish `dev-dependencies` without including
2897 a `version`.][cargo/7333]
2901 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2902 when running documentation tests with `rustdoc`.][63803]
2906 - [As previously announced, any previous NLL warnings in the 2015 edition are
2907 now hard errors.][64221]
2908 - [The `include!` macro will now warn if it failed to include the
2909 entire file.][64284] The `include!` macro unintentionally only includes the
2910 first _expression_ in a file, and this can be unintuitive. This will become
2911 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2912 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2913 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2914 or `extern` blocks now correctly emits a hard error.
2916 [65294]: https://github.com/rust-lang/rust/pull/65294/
2917 [66103]: https://github.com/rust-lang/rust/pull/66103/
2918 [65843]: https://github.com/rust-lang/rust/pull/65843/
2919 [65188]: https://github.com/rust-lang/rust/pull/65188/
2920 [65092]: https://github.com/rust-lang/rust/pull/65092/
2921 [64589]: https://github.com/rust-lang/rust/pull/64589/
2922 [64639]: https://github.com/rust-lang/rust/pull/64639/
2923 [64221]: https://github.com/rust-lang/rust/pull/64221/
2924 [64284]: https://github.com/rust-lang/rust/pull/64284/
2925 [63931]: https://github.com/rust-lang/rust/pull/63931/
2926 [64035]: https://github.com/rust-lang/rust/pull/64035/
2927 [63674]: https://github.com/rust-lang/rust/pull/63674/
2928 [63803]: https://github.com/rust-lang/rust/pull/63803/
2929 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2930 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2931 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2932 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2933 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2934 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2935 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2936 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2937 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2938 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2939 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2940 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2941 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2942 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2943 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2944 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2945 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2946 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2947 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2948 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2949 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2950 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2951 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2952 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2953 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2956 Version 1.39.0 (2019-11-07)
2957 ===========================
2961 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2962 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2963 - [You can now use certain attributes on function, closure, and function pointer
2964 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2965 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2966 attributes applied to items. e.g.
2969 #[cfg(windows)] slice: &[u16],
2970 #[cfg(not(windows))] slice: &[u8],
2975 - [You can now take shared references to bind-by-move patterns in the `if` guards
2976 of `match` arms.][63118] e.g.
2979 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2983 // ---- `nums` is bound by move.
2984 if nums.iter().sum::<u8>() == 10
2985 // ^------ `.iter()` implicitly takes a reference to `nums`.
2988 // ----------- Legal as `nums` was bound by move and so we have ownership.
2990 _ => unreachable!(),
2999 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3000 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3001 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3002 **Note** Cargo currently doesn't use this feature. Refer to
3003 [cargo#7315][cargo/7315] to track this feature's progress.
3004 - [You can now pass `--show-output` argument to test binaries to print the
3005 output of successful tests.][62600]
3008 \* Refer to Rust's [platform support page][platform-support-doc] for more
3009 information on Rust's tiered platform support.
3013 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3014 - [`LinkedList::new` is now a `const` function.][63684]
3015 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3016 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3017 now `const`.][63786]
3021 - [`Pin::into_inner`]
3022 - [`Instant::checked_duration_since`]
3023 - [`Instant::saturating_duration_since`]
3027 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3028 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3029 `--all` is now deprecated.
3033 - [You can now pass `-Clinker` to rustdoc to control the linker used
3034 for compiling doctests.][63834]
3038 - [Code that was previously accepted by the old borrow checker, but rejected by
3039 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3040 previously a warning, and will also become a hard error in the Rust 2015
3041 edition in the 1.40.0 release.
3042 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3043 run tests.][63827] This should improve performance when running a large
3045 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3046 recommended to use the `?` operator instead.
3047 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3050 [62600]: https://github.com/rust-lang/rust/pull/62600/
3051 [62672]: https://github.com/rust-lang/rust/pull/62672/
3052 [63118]: https://github.com/rust-lang/rust/pull/63118/
3053 [63209]: https://github.com/rust-lang/rust/pull/63209/
3054 [63402]: https://github.com/rust-lang/rust/pull/63402/
3055 [63565]: https://github.com/rust-lang/rust/pull/63565/
3056 [63595]: https://github.com/rust-lang/rust/pull/63595/
3057 [63684]: https://github.com/rust-lang/rust/pull/63684/
3058 [63698]: https://github.com/rust-lang/rust/pull/63698/
3059 [63770]: https://github.com/rust-lang/rust/pull/63770/
3060 [63786]: https://github.com/rust-lang/rust/pull/63786/
3061 [63827]: https://github.com/rust-lang/rust/pull/63827/
3062 [63834]: https://github.com/rust-lang/rust/pull/63834/
3063 [64010]: https://github.com/rust-lang/rust/pull/64010/
3064 [64028]: https://github.com/rust-lang/rust/pull/64028/
3065 [64334]: https://github.com/rust-lang/rust/pull/64334/
3066 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3067 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3068 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3069 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3070 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3071 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3073 Version 1.38.0 (2019-09-26)
3074 ==========================
3078 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3079 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3083 - [Added pipelined compilation support to `rustc`.][62766] This will
3084 improve compilation times in some cases. For further information please refer
3085 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3086 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3087 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3088 `x86_64-uwp-windows-msvc` targets.][60260]
3089 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3090 `armv7-unknown-linux-musleabi` targets.][63107]
3091 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3092 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3093 - [Upgraded to LLVM 9.][62592]
3095 \* Refer to Rust's [platform support page][platform-support-doc] for more
3096 information on Rust's tiered platform support.
3100 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3101 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3102 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3103 is available at `std::clone::Clone`). This also makes all built-in macros
3104 available in `std`/`core` root. e.g. `std::include_bytes!`.
3105 - [`str::Chars` now implements `Debug`.][63000]
3106 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3107 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3108 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3109 - [Added euclidean remainder and division operations (`div_euclid`,
3110 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3111 `overflowing`, and `wrapping` versions are available for all
3113 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3114 `PartialEq`.][61491]
3115 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3119 - [`<*const T>::cast`]
3120 - [`<*mut T>::cast`]
3121 - [`Duration::as_secs_f32`]
3122 - [`Duration::as_secs_f64`]
3123 - [`Duration::div_f32`]
3124 - [`Duration::div_f64`]
3125 - [`Duration::from_secs_f32`]
3126 - [`Duration::from_secs_f64`]
3127 - [`Duration::mul_f32`]
3128 - [`Duration::mul_f64`]
3129 - [`any::type_name`]
3133 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3134 - [You can now pass the `--features` option multiple times to enable
3135 multiple features.][cargo/7084]
3140 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3144 - [`rustc` will now warn about some incorrect uses of
3145 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3149 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3151 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3152 issues][62896] with certain crates such as libc.
3154 [60260]: https://github.com/rust-lang/rust/pull/60260/
3155 [61457]: https://github.com/rust-lang/rust/pull/61457/
3156 [61491]: https://github.com/rust-lang/rust/pull/61491/
3157 [61884]: https://github.com/rust-lang/rust/pull/61884/
3158 [61953]: https://github.com/rust-lang/rust/pull/61953/
3159 [62042]: https://github.com/rust-lang/rust/pull/62042/
3160 [62528]: https://github.com/rust-lang/rust/pull/62528/
3161 [62583]: https://github.com/rust-lang/rust/pull/62583/
3162 [62735]: https://github.com/rust-lang/rust/pull/62735/
3163 [62766]: https://github.com/rust-lang/rust/pull/62766/
3164 [62784]: https://github.com/rust-lang/rust/pull/62784/
3165 [62592]: https://github.com/rust-lang/rust/pull/62592/
3166 [62785]: https://github.com/rust-lang/rust/issues/62785/
3167 [62814]: https://github.com/rust-lang/rust/pull/62814/
3168 [62896]: https://github.com/rust-lang/rust/issues/62896/
3169 [63000]: https://github.com/rust-lang/rust/pull/63000/
3170 [63056]: https://github.com/rust-lang/rust/pull/63056/
3171 [63107]: https://github.com/rust-lang/rust/pull/63107/
3172 [63346]: https://github.com/rust-lang/rust/pull/63346/
3173 [63421]: https://github.com/rust-lang/rust/pull/63421/
3174 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3175 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3176 [63048]: https://github.com/rust-lang/rust/pull/63048
3177 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3178 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3179 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3180 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3181 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3182 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3183 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3184 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3185 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3186 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3187 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3188 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3189 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3191 Version 1.37.0 (2019-08-15)
3192 ==========================
3196 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3197 [`Box`][62228], or an [array][62235] and unused.
3198 - [You can now use the `cfg` and `cfg_attr` attributes on
3199 generic parameters.][61547]
3200 - [You can now use enum variants through type alias.][61682] e.g. You can
3201 write the following:
3203 type MyOption = Option<u8>;
3205 fn increment_or_zero(x: MyOption) -> u8 {
3207 MyOption::Some(y) => y + 1,
3208 MyOption::None => 0,
3212 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3213 `const _: u32 = 5;`.
3214 - [You can now use `#[repr(align(X)]` on enums.][61229]
3215 - [The `?` Kleene macro operator is now available in the
3216 2015 edition.][60932]
3220 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3221 and `-C profile-use` flags.][61268] For more information on how to use profile
3222 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3223 - [The `rust-lldb` wrapper script should now work again.][61827]
3227 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3231 - [`BufReader::buffer`]
3232 - [`BufWriter::buffer`]
3233 - [`Cell::from_mut`]
3234 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3235 - [`DoubleEndedIterator::nth_back`]
3237 - [`Wrapping::reverse_bits`]
3238 - [`i128::reverse_bits`]
3239 - [`i16::reverse_bits`]
3240 - [`i32::reverse_bits`]
3241 - [`i64::reverse_bits`]
3242 - [`i8::reverse_bits`]
3243 - [`isize::reverse_bits`]
3244 - [`slice::copy_within`]
3245 - [`u128::reverse_bits`]
3246 - [`u16::reverse_bits`]
3247 - [`u32::reverse_bits`]
3248 - [`u64::reverse_bits`]
3249 - [`u8::reverse_bits`]
3250 - [`usize::reverse_bits`]
3254 - [`Cargo.lock` files are now included by default when publishing executable crates
3255 with executables.][cargo/7026]
3256 - [You can now specify `default-run="foo"` in `[package]` to specify the
3257 default executable to use for `cargo run`.][cargo/7056]
3264 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3265 Please transition your code to using the `..=` syntax for inclusive
3267 - [Using a trait object without the `dyn` will now warn by default.][61203]
3268 Please transition your code to use `dyn Trait` for trait objects instead.
3270 [62228]: https://github.com/rust-lang/rust/pull/62228/
3271 [62235]: https://github.com/rust-lang/rust/pull/62235/
3272 [61802]: https://github.com/rust-lang/rust/pull/61802/
3273 [61827]: https://github.com/rust-lang/rust/pull/61827/
3274 [61547]: https://github.com/rust-lang/rust/pull/61547/
3275 [61682]: https://github.com/rust-lang/rust/pull/61682/
3276 [61268]: https://github.com/rust-lang/rust/pull/61268/
3277 [61342]: https://github.com/rust-lang/rust/pull/61342/
3278 [61347]: https://github.com/rust-lang/rust/pull/61347/
3279 [61100]: https://github.com/rust-lang/rust/pull/61100/
3280 [61203]: https://github.com/rust-lang/rust/pull/61203/
3281 [61229]: https://github.com/rust-lang/rust/pull/61229/
3282 [60932]: https://github.com/rust-lang/rust/pull/60932/
3283 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3284 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3285 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3286 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3287 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3288 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3289 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3290 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3291 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3292 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3293 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3294 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3295 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3296 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3297 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3298 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3299 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3300 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3301 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3302 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3303 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3304 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3305 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3308 Version 1.36.0 (2019-07-04)
3309 ==========================
3313 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3314 - [The order of traits in trait objects no longer affects the semantics of that
3315 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3316 `dyn fmt::Debug + Send`, where this was previously not the case.
3320 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3321 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3322 - [`mem::needs_drop` is now available as a const fn.][60364]
3323 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3324 - [`String` now implements `BorrowMut<str>`.][60404]
3325 - [`io::Cursor` now implements `Default`.][60234]
3326 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3327 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3328 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3329 environment has access to heap memory allocation.
3330 - [`String` now implements `From<&String>`.][59825]
3331 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3332 return a tuple of each argument when there is multiple arguments.
3333 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3338 - [`VecDeque::rotate_left`]
3339 - [`VecDeque::rotate_right`]
3340 - [`Iterator::copied`]
3342 - [`io::IoSliceMut`]
3343 - [`Read::read_vectored`]
3344 - [`Write::write_vectored`]
3345 - [`str::as_mut_ptr`]
3346 - [`mem::MaybeUninit`]
3347 - [`pointer::align_offset`]
3348 - [`future::Future`]
3350 - [`task::RawWaker`]
3351 - [`task::RawWakerVTable`]
3357 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3358 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3360 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3364 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3371 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3372 longer recommended, and will be deprecated in 1.39.0.
3374 [60318]: https://github.com/rust-lang/rust/pull/60318/
3375 [60364]: https://github.com/rust-lang/rust/pull/60364/
3376 [60370]: https://github.com/rust-lang/rust/pull/60370/
3377 [60404]: https://github.com/rust-lang/rust/pull/60404/
3378 [60234]: https://github.com/rust-lang/rust/pull/60234/
3379 [60244]: https://github.com/rust-lang/rust/pull/60244/
3380 [58623]: https://github.com/rust-lang/rust/pull/58623/
3381 [59648]: https://github.com/rust-lang/rust/pull/59648/
3382 [59675]: https://github.com/rust-lang/rust/pull/59675/
3383 [59825]: https://github.com/rust-lang/rust/pull/59825/
3384 [59826]: https://github.com/rust-lang/rust/pull/59826/
3385 [59445]: https://github.com/rust-lang/rust/pull/59445/
3386 [59114]: https://github.com/rust-lang/rust/pull/59114/
3387 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3388 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3389 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3390 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3391 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3392 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3393 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3394 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3395 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3396 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3397 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3398 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3399 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3400 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3401 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3402 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3403 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3404 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3405 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3406 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3409 Version 1.35.0 (2019-05-23)
3410 ==========================
3414 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3415 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3416 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3418 unsafe fn call_unsafe(func: unsafe fn()) {
3423 unsafe { call_unsafe(|| {}); }
3430 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3431 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3432 - [Added the `wasm32-unknown-wasi` target.][59464]
3437 - [`Thread` will now show its ID in `Debug` output.][59460]
3438 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3439 - [`alloc::System` now implements `Default`.][59451]
3440 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3442 - [`char::{ToLowercase, ToUppercase}` now
3443 implement `ExactSizeIterator`.][58778]
3444 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3445 - [Removed the `Read` trait bounds
3446 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3447 - [You can now call the `dbg!` macro without any parameters to print the file
3448 and line where it is called.][57847]
3449 - [In place ASCII case conversions are now up to 4× faster.][59283]
3450 e.g. `str::make_ascii_lowercase`
3451 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3458 - [`RefCell::replace_with`]
3459 - [`RefCell::map_split`]
3461 - [`Range::contains`]
3462 - [`RangeFrom::contains`]
3463 - [`RangeTo::contains`]
3464 - [`RangeInclusive::contains`]
3465 - [`RangeToInclusive::contains`]
3466 - [`Option::copied`]
3470 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3471 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3476 - [The Rust toolchain is now available natively for musl based distros.][58575]
3478 [59460]: https://github.com/rust-lang/rust/pull/59460/
3479 [59464]: https://github.com/rust-lang/rust/pull/59464/
3480 [59500]: https://github.com/rust-lang/rust/pull/59500/
3481 [59512]: https://github.com/rust-lang/rust/pull/59512/
3482 [59580]: https://github.com/rust-lang/rust/pull/59580/
3483 [59283]: https://github.com/rust-lang/rust/pull/59283/
3484 [59451]: https://github.com/rust-lang/rust/pull/59451/
3485 [59076]: https://github.com/rust-lang/rust/pull/59076/
3486 [58778]: https://github.com/rust-lang/rust/pull/58778/
3487 [58717]: https://github.com/rust-lang/rust/pull/58717/
3488 [58369]: https://github.com/rust-lang/rust/pull/58369/
3489 [58423]: https://github.com/rust-lang/rust/pull/58423/
3490 [58080]: https://github.com/rust-lang/rust/pull/58080/
3491 [57847]: https://github.com/rust-lang/rust/pull/57847/
3492 [58575]: https://github.com/rust-lang/rust/pull/58575
3493 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3494 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3495 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3496 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3497 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3498 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3499 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3500 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3501 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3502 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3503 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3504 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3506 Version 1.34.2 (2019-05-14)
3507 ===========================
3509 * [Destabilize the `Error::type_id` function due to a security
3510 vulnerability][60785] ([CVE-2019-12083])
3512 [60785]: https://github.com/rust-lang/rust/pull/60785
3513 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3515 Version 1.34.1 (2019-04-25)
3516 ===========================
3518 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3519 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3520 * [Fix Clippy panic when checking some macros][clippy/3805]
3522 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3523 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3524 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3526 Version 1.34.0 (2019-04-11)
3527 ==========================
3531 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3532 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3534 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3535 `#[attr{}]` procedural macros.][57367]
3536 - [You can now write `extern crate self as foo;`][57407] to import your
3537 crate's root into the extern prelude.
3542 - [You can now target `riscv64imac-unknown-none-elf` and
3543 `riscv64gc-unknown-none-elf`.][58406]
3544 - [You can now enable linker plugin LTO optimisations with
3545 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3546 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3548 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3553 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3554 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3555 the `Hash` trait to create an iterator.
3556 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3557 methods.][58421] Most notably you no longer require the `Ord` trait to create
3559 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3560 for all numeric types.][58044]
3561 - [Indexing a `str` is now generic over all types that
3562 implement `SliceIndex<str>`.][57604]
3563 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3564 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3565 produce a warning if their returning type is unused.
3566 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3567 `overflowing_pow` are now available for all numeric types.][57873] These are
3568 equivalent to methods such as `wrapping_add` for the `pow` operation.
3576 * [`Error::type_id`]
3577 * [`atomic::AtomicI16`]
3578 * [`atomic::AtomicI32`]
3579 * [`atomic::AtomicI64`]
3580 * [`atomic::AtomicI8`]
3581 * [`atomic::AtomicU16`]
3582 * [`atomic::AtomicU32`]
3583 * [`atomic::AtomicU64`]
3584 * [`atomic::AtomicU8`]
3585 * [`convert::Infallible`]
3586 * [`convert::TryFrom`]
3587 * [`convert::TryInto`]
3589 * [`iter::successors`]
3590 * [`num::NonZeroI128`]
3591 * [`num::NonZeroI16`]
3592 * [`num::NonZeroI32`]
3593 * [`num::NonZeroI64`]
3594 * [`num::NonZeroI8`]
3595 * [`num::NonZeroIsize`]
3596 * [`slice::sort_by_cached_key`]
3597 * [`str::escape_debug`]
3598 * [`str::escape_default`]
3599 * [`str::escape_unicode`]
3600 * [`str::split_ascii_whitespace`]
3603 * [`Instant::checked_add`]
3604 * [`Instant::checked_sub`]
3605 * [`SystemTime::checked_add`]
3606 * [`SystemTime::checked_sub`]
3610 - [You can now use alternative registries to crates.io.][cargo/6654]
3614 - [You can now use the `?` operator in your documentation tests without manually
3615 adding `fn main() -> Result<(), _> {}`.][56470]
3619 - [`Command::before_exec` is being replaced by the unsafe method
3620 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3621 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3622 can now use `const` functions in `static` variables.
3624 [58370]: https://github.com/rust-lang/rust/pull/58370/
3625 [58406]: https://github.com/rust-lang/rust/pull/58406/
3626 [58421]: https://github.com/rust-lang/rust/pull/58421/
3627 [58166]: https://github.com/rust-lang/rust/pull/58166/
3628 [58044]: https://github.com/rust-lang/rust/pull/58044/
3629 [58057]: https://github.com/rust-lang/rust/pull/58057/
3630 [58059]: https://github.com/rust-lang/rust/pull/58059/
3631 [57809]: https://github.com/rust-lang/rust/pull/57809/
3632 [57873]: https://github.com/rust-lang/rust/pull/57873/
3633 [57604]: https://github.com/rust-lang/rust/pull/57604/
3634 [57367]: https://github.com/rust-lang/rust/pull/57367/
3635 [57407]: https://github.com/rust-lang/rust/pull/57407/
3636 [57425]: https://github.com/rust-lang/rust/pull/57425/
3637 [57106]: https://github.com/rust-lang/rust/pull/57106/
3638 [56470]: https://github.com/rust-lang/rust/pull/56470/
3639 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3640 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3641 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3642 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3643 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3644 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3645 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3646 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3647 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3648 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3649 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3650 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3651 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3652 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3653 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3654 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3655 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3656 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3657 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3658 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3659 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3660 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3661 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3662 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3663 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3664 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3665 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3666 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3667 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3668 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3669 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3672 Version 1.33.0 (2019-02-28)
3673 ==========================
3677 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3678 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3679 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3680 E.g. You can have match statement on a `u8` that covers `0..=255` and
3681 you would no longer be required to have a `_ => unreachable!()` case.
3682 - [You can now have multiple patterns in `if let` and `while let`
3683 expressions.][57532] You can do this with the same syntax as a `match`
3693 let state = Creature::Crab("Ferris");
3695 if let Creature::Crab(name) | Creature::Person(name) = state {
3696 println!("This creature's name is: {}", name);
3700 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3701 this feature will by default produce a warning as this behaviour can be
3702 unintuitive. E.g. `if let _ = 5 {}`
3703 - [You can now use `let` bindings, assignments, expression statements,
3704 and irrefutable pattern destructuring in const functions.][57175]
3705 - [You can now call unsafe const functions.][57067] E.g.
3707 const unsafe fn foo() -> i32 { 5 }
3708 const fn bar() -> i32 {
3712 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3713 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3714 - [You can now specify a specific alignment with the `#[repr(packed)]`
3715 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3716 with an alignment of 2 bytes and a size of 6 bytes.
3717 - [You can now import an item from a module as an `_`.][56303] This allows you to
3718 import a trait's impls, and not have the name in the namespace. E.g.
3720 use std::io::Read as _;
3722 // Allowed as there is only one `Read` in the module.
3725 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3729 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3730 command line argument.][56351]
3731 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3732 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3733 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3734 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3735 information on Rust's platform support.
3736 - [Added support for the `thumbv7neon-linux-androideabi` and
3737 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3738 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3742 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3743 functions for all numeric types.][57566]
3744 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3745 are now `const` functions for all numeric types.][57105]
3746 - [The methods `is_positive` and `is_negative` are now `const` functions for
3747 all signed numeric types.][57105]
3748 - [The `get` method for all `NonZero` types is now `const`.][57167]
3749 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3750 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3751 numeric types.][57234]
3752 - [`Ipv4Addr::new` is now a `const` function][57234]
3756 - [`unix::FileExt::read_exact_at`]
3757 - [`unix::FileExt::write_all_at`]
3758 - [`Option::transpose`]
3759 - [`Result::transpose`]
3760 - [`convert::identity`]
3763 - [`marker::PhantomPinned`]
3764 - [`Vec::resize_with`]
3765 - [`VecDeque::resize_with`]
3766 - [`Duration::as_millis`]
3767 - [`Duration::as_micros`]
3768 - [`Duration::as_nanos`]
3773 - [You can now publish crates that require a feature flag to compile with
3774 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3775 - [Cargo should now rebuild a crate if a file was modified during the initial
3780 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3781 are now deprecated in the standard library, and their usage will now produce a warning.
3782 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3784 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3786 - [Libtest no longer creates a new thread for each test when
3787 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3789 [56243]: https://github.com/rust-lang/rust/pull/56243
3790 [56303]: https://github.com/rust-lang/rust/pull/56303/
3791 [56351]: https://github.com/rust-lang/rust/pull/56351/
3792 [56362]: https://github.com/rust-lang/rust/pull/56362
3793 [56642]: https://github.com/rust-lang/rust/pull/56642/
3794 [56769]: https://github.com/rust-lang/rust/pull/56769/
3795 [56805]: https://github.com/rust-lang/rust/pull/56805
3796 [56947]: https://github.com/rust-lang/rust/pull/56947/
3797 [57049]: https://github.com/rust-lang/rust/pull/57049/
3798 [57067]: https://github.com/rust-lang/rust/pull/57067/
3799 [57105]: https://github.com/rust-lang/rust/pull/57105
3800 [57130]: https://github.com/rust-lang/rust/pull/57130/
3801 [57167]: https://github.com/rust-lang/rust/pull/57167/
3802 [57175]: https://github.com/rust-lang/rust/pull/57175/
3803 [57234]: https://github.com/rust-lang/rust/pull/57234/
3804 [57332]: https://github.com/rust-lang/rust/pull/57332/
3805 [57465]: https://github.com/rust-lang/rust/pull/57465/
3806 [57532]: https://github.com/rust-lang/rust/pull/57532/
3807 [57535]: https://github.com/rust-lang/rust/pull/57535/
3808 [57566]: https://github.com/rust-lang/rust/pull/57566/
3809 [57615]: https://github.com/rust-lang/rust/pull/57615/
3810 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3811 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3812 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3813 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3814 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3815 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3816 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3817 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3818 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3819 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3820 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3821 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3822 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3823 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3824 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3825 [platform-support]: https://forge.rust-lang.org/platform-support.html
3827 Version 1.32.0 (2019-01-17)
3828 ==========================
3833 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3834 operator allows you to specify zero or one repetitions similar to the `*` and
3836 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3837 now always resolve to the item (`enum`, `struct`, etc.) available in the
3838 module if present, before resolving to a external crate or an item the prelude.][56759]
3841 enum Color { Red, Green, Blue }
3847 - [You can now match against `PhantomData<T>` types.][55837]
3848 - [You can now match against literals in macros with the `literal`
3849 specifier.][56072] This will match against a literal of any type.
3850 E.g. `1`, `'A'`, `"Hello World"`
3851 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3853 struct Point(i32, i32);
3856 pub fn new(x: i32, y: i32) -> Self {
3860 pub fn is_origin(&self) -> bool {
3868 - [Self can also now be used in type definitions.][56366] E.g.
3872 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3875 Cons(T, Box<Self>) // likewise here
3878 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3879 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3883 - [The default allocator has changed from jemalloc to the default allocator on
3884 your system.][55238] The compiler itself on Linux & macOS will still use
3885 jemalloc, but programs compiled with it will use the system allocator.
3886 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3890 - [`PathBuf` now implements `FromStr`.][55148]
3891 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3892 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3893 easily debug expressions in your rust program. E.g.
3896 let b = dbg!(a * 2) + 1;
3897 // ^-- prints: [src/main.rs:4] a * 2 = 4
3901 The following APIs are now `const` functions and can be used in a
3905 - [`UnsafeCell::get`]
3906 - [`char::is_ascii`]
3908 - [`ManuallyDrop::new`]
3909 - [`ManuallyDrop::into_inner`]
3910 - [`RangeInclusive::start`]
3911 - [`RangeInclusive::end`]
3912 - [`NonNull::as_ptr`]
3915 - [`Duration::as_secs`]
3916 - [`Duration::subsec_millis`]
3917 - [`Duration::subsec_micros`]
3918 - [`Duration::subsec_nanos`]
3920 - [`Ipv4Addr::is_unspecified`]
3922 - [`Ipv6Addr::octets`]
3926 - [`i8::to_be_bytes`]
3927 - [`i8::to_le_bytes`]
3928 - [`i8::to_ne_bytes`]
3929 - [`i8::from_be_bytes`]
3930 - [`i8::from_le_bytes`]
3931 - [`i8::from_ne_bytes`]
3932 - [`i16::to_be_bytes`]
3933 - [`i16::to_le_bytes`]
3934 - [`i16::to_ne_bytes`]
3935 - [`i16::from_be_bytes`]
3936 - [`i16::from_le_bytes`]
3937 - [`i16::from_ne_bytes`]
3938 - [`i32::to_be_bytes`]
3939 - [`i32::to_le_bytes`]
3940 - [`i32::to_ne_bytes`]
3941 - [`i32::from_be_bytes`]
3942 - [`i32::from_le_bytes`]
3943 - [`i32::from_ne_bytes`]
3944 - [`i64::to_be_bytes`]
3945 - [`i64::to_le_bytes`]
3946 - [`i64::to_ne_bytes`]
3947 - [`i64::from_be_bytes`]
3948 - [`i64::from_le_bytes`]
3949 - [`i64::from_ne_bytes`]
3950 - [`i128::to_be_bytes`]
3951 - [`i128::to_le_bytes`]
3952 - [`i128::to_ne_bytes`]
3953 - [`i128::from_be_bytes`]
3954 - [`i128::from_le_bytes`]
3955 - [`i128::from_ne_bytes`]
3956 - [`isize::to_be_bytes`]
3957 - [`isize::to_le_bytes`]
3958 - [`isize::to_ne_bytes`]
3959 - [`isize::from_be_bytes`]
3960 - [`isize::from_le_bytes`]
3961 - [`isize::from_ne_bytes`]
3962 - [`u8::to_be_bytes`]
3963 - [`u8::to_le_bytes`]
3964 - [`u8::to_ne_bytes`]
3965 - [`u8::from_be_bytes`]
3966 - [`u8::from_le_bytes`]
3967 - [`u8::from_ne_bytes`]
3968 - [`u16::to_be_bytes`]
3969 - [`u16::to_le_bytes`]
3970 - [`u16::to_ne_bytes`]
3971 - [`u16::from_be_bytes`]
3972 - [`u16::from_le_bytes`]
3973 - [`u16::from_ne_bytes`]
3974 - [`u32::to_be_bytes`]
3975 - [`u32::to_le_bytes`]
3976 - [`u32::to_ne_bytes`]
3977 - [`u32::from_be_bytes`]
3978 - [`u32::from_le_bytes`]
3979 - [`u32::from_ne_bytes`]
3980 - [`u64::to_be_bytes`]
3981 - [`u64::to_le_bytes`]
3982 - [`u64::to_ne_bytes`]
3983 - [`u64::from_be_bytes`]
3984 - [`u64::from_le_bytes`]
3985 - [`u64::from_ne_bytes`]
3986 - [`u128::to_be_bytes`]
3987 - [`u128::to_le_bytes`]
3988 - [`u128::to_ne_bytes`]
3989 - [`u128::from_be_bytes`]
3990 - [`u128::from_le_bytes`]
3991 - [`u128::from_ne_bytes`]
3992 - [`usize::to_be_bytes`]
3993 - [`usize::to_le_bytes`]
3994 - [`usize::to_ne_bytes`]
3995 - [`usize::from_be_bytes`]
3996 - [`usize::from_le_bytes`]
3997 - [`usize::from_ne_bytes`]
4001 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4002 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4006 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4010 - [The argument types for AVX's
4011 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4012 been changed from `*const` to `*mut` as the previous implementation
4016 [55148]: https://github.com/rust-lang/rust/pull/55148/
4017 [55238]: https://github.com/rust-lang/rust/pull/55238/
4018 [55280]: https://github.com/rust-lang/rust/pull/55280/
4019 [55610]: https://github.com/rust-lang/rust/pull/55610/
4020 [55663]: https://github.com/rust-lang/rust/pull/55663/
4021 [55702]: https://github.com/rust-lang/rust/pull/55702/
4022 [55837]: https://github.com/rust-lang/rust/pull/55837/
4023 [55843]: https://github.com/rust-lang/rust/pull/55843/
4024 [56072]: https://github.com/rust-lang/rust/pull/56072/
4025 [56245]: https://github.com/rust-lang/rust/pull/56245/
4026 [56365]: https://github.com/rust-lang/rust/pull/56365/
4027 [56366]: https://github.com/rust-lang/rust/pull/56366/
4028 [56395]: https://github.com/rust-lang/rust/pull/56395/
4029 [56759]: https://github.com/rust-lang/rust/pull/56759/
4030 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4031 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4032 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4033 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4034 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4035 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4036 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4037 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4038 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4039 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4040 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4041 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4042 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4043 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4044 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4045 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4046 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4047 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4048 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4049 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4050 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4051 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4052 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4053 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4054 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4055 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4056 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4057 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4058 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4059 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4060 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4061 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4062 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4063 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4064 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4065 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4066 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4067 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4068 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4069 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4070 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4071 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4072 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4073 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4074 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4075 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4076 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4077 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4078 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4079 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4080 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4081 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4082 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4083 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4084 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4085 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4086 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4087 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4088 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4089 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4090 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4091 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4092 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4093 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4094 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4095 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4096 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4097 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4098 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4099 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4100 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4101 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4102 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4103 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4104 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4105 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4106 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4107 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4108 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4109 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4110 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4111 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4112 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4113 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4114 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4115 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4116 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4117 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4118 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4119 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4120 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4121 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4122 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4125 Version 1.31.1 (2018-12-20)
4126 ===========================
4128 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4129 - [Fix broken go-to-definition in RLS][rls/1171]
4130 - [Fix infinite loop on hover in RLS][rls/1170]
4132 [56562]: https://github.com/rust-lang/rust/pull/56562
4133 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4134 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4136 Version 1.31.0 (2018-12-06)
4137 ==========================
4141 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4142 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4143 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4144 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4146 - [You can now define and use `const` functions.][54835] These are currently
4147 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4148 [language reference][const-reference] for what exactly is available.
4149 - [You can now use tool lints, which allow you to scope lints from external
4150 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4151 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4152 a crate, not just in exported functions.][54451]
4153 - [You can now use parentheses in pattern matches.][54497]
4157 - [Updated musl to 1.1.20][54430]
4161 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4162 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4163 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4164 into `Option<&mut T>` using the `From` trait.][53218]
4165 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4170 - [`slice::align_to`]
4171 - [`slice::align_to_mut`]
4172 - [`slice::chunks_exact`]
4173 - [`slice::chunks_exact_mut`]
4174 - [`slice::rchunks`]
4175 - [`slice::rchunks_mut`]
4176 - [`slice::rchunks_exact`]
4177 - [`slice::rchunks_exact_mut`]
4178 - [`Option::replace`]
4182 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4183 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4184 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4186 [52813]: https://github.com/rust-lang/rust/pull/52813/
4187 [53218]: https://github.com/rust-lang/rust/pull/53218/
4188 [54057]: https://github.com/rust-lang/rust/pull/54057/
4189 [54240]: https://github.com/rust-lang/rust/pull/54240/
4190 [54430]: https://github.com/rust-lang/rust/pull/54430/
4191 [54451]: https://github.com/rust-lang/rust/pull/54451/
4192 [54497]: https://github.com/rust-lang/rust/pull/54497/
4193 [54778]: https://github.com/rust-lang/rust/pull/54778/
4194 [54835]: https://github.com/rust-lang/rust/pull/54835/
4195 [54870]: https://github.com/rust-lang/rust/pull/54870/
4196 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4197 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4198 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4199 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4200 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4201 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4202 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4203 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4204 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4205 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4206 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4207 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4208 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4209 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4211 Version 1.30.1 (2018-11-08)
4212 ===========================
4214 - [Fixed overflow ICE in rustdoc][54199]
4215 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4217 [54199]: https://github.com/rust-lang/rust/pull/54199
4218 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4220 Version 1.30.0 (2018-10-25)
4221 ==========================
4225 - [Procedural macros are now available.][52081] These kinds of macros allow for
4226 more powerful code generation. There is a [new chapter available][proc-macros]
4227 in the Rust Programming Language book that goes further in depth.
4228 - [You can now use keywords as identifiers using the raw identifiers
4229 syntax (`r#`),][53236] e.g. `let r#for = true;`
4230 - [Using anonymous parameters in traits is now deprecated with a warning and
4231 will be a hard error in the 2018 edition.][53272]
4232 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4233 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4234 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4235 Previously, using a external crate in a module without a use statement
4236 required `let json = ::serde_json::from_str(foo);` but can now be written
4237 as `let json = serde_json::from_str(foo);`.
4238 - [You can now apply the `#[used]` attribute to static items to prevent the
4239 compiler from optimising them away, even if they appear to be unused,][51363]
4240 e.g. `#[used] static FOO: u32 = 1;`
4241 - [You can now import and reexport macros from other crates with the `use`
4242 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4243 the root module of the crate. If your macro relies on calling other local
4244 macros, it is recommended to export with the
4245 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4247 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4248 using the `vis` specifier.][53370]
4249 - [Non-macro attributes now allow all forms of literals, not just
4250 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4251 write `#[attr(true)]`.
4252 - [You can now specify a function to handle a panic in the Rust runtime with the
4253 `#[panic_handler]` attribute.][51366]
4257 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4258 - [Added the `aarch64-unknown-netbsd` target][53165]
4259 - [Upgraded to LLVM 8.][53611]
4263 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4267 - [`Ipv4Addr::BROADCAST`]
4268 - [`Ipv4Addr::LOCALHOST`]
4269 - [`Ipv4Addr::UNSPECIFIED`]
4270 - [`Ipv6Addr::LOCALHOST`]
4271 - [`Ipv6Addr::UNSPECIFIED`]
4272 - [`Iterator::find_map`]
4274 The following methods are replacement methods for `trim_left`, `trim_right`,
4275 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4277 - [`str::trim_end_matches`]
4279 - [`str::trim_start_matches`]
4280 - [`str::trim_start`]
4284 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4285 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4286 equivalent to calling `rustdoc --error-format=json`.
4287 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4291 - [`rustdoc` allows you to specify what edition to treat your code as with the
4292 `--edition` option.][54057]
4293 - [`rustdoc` now has the `--color` (specify whether to output color) and
4294 `--error-format` (specify error format, e.g. `json`) options.][53003]
4295 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4296 debug symbols.][53774]
4297 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4298 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4300 [50911]: https://github.com/rust-lang/rust/pull/50911/
4301 [51363]: https://github.com/rust-lang/rust/pull/51363/
4302 [51366]: https://github.com/rust-lang/rust/pull/51366/
4303 [52081]: https://github.com/rust-lang/rust/pull/52081/
4304 [53003]: https://github.com/rust-lang/rust/pull/53003/
4305 [53033]: https://github.com/rust-lang/rust/pull/53033/
4306 [53044]: https://github.com/rust-lang/rust/pull/53044/
4307 [53165]: https://github.com/rust-lang/rust/pull/53165/
4308 [53611]: https://github.com/rust-lang/rust/pull/53611/
4309 [53236]: https://github.com/rust-lang/rust/pull/53236/
4310 [53272]: https://github.com/rust-lang/rust/pull/53272/
4311 [53370]: https://github.com/rust-lang/rust/pull/53370/
4312 [53459]: https://github.com/rust-lang/rust/pull/53459/
4313 [53774]: https://github.com/rust-lang/rust/pull/53774/
4314 [53822]: https://github.com/rust-lang/rust/pull/53822/
4315 [54057]: https://github.com/rust-lang/rust/pull/54057/
4316 [54404]: https://github.com/rust-lang/rust/pull/54404/
4317 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4318 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4319 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4320 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4322 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4323 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4324 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4325 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4326 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4327 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4328 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4329 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4330 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4331 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4334 Version 1.29.2 (2018-10-11)
4335 ===========================
4337 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4338 - The `rls-preview` component on the windows-gnu targets has been restored.
4340 [54639]: https://github.com/rust-lang/rust/pull/54639
4343 Version 1.29.1 (2018-09-25)
4344 ===========================
4349 - The standard library's `str::repeat` function contained an out of bounds write
4350 caused by an integer overflow. This has been fixed by deterministically
4351 panicking when an overflow happens.
4353 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4357 Version 1.29.0 (2018-09-13)
4358 ==========================
4362 - [Bumped minimum LLVM version to 5.0.][51899]
4363 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4364 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4365 - [Upgraded to LLVM 7.][51966]
4369 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4370 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4371 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4372 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4374 - [`Cell<T>` now allows `T` to be unsized.][50494]
4375 - [`SocketAddr` is now stable on Redox.][52656]
4380 - [`Iterator::flatten`]
4385 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4386 `--locked` to disable this behavior.
4387 - [`cargo-install` will now allow you to cross compile an install
4388 using `--target`.][cargo/5614]
4389 - [Added the `cargo-fix` subcommand to automatically move project code from
4390 2015 edition to 2018.][cargo/5723]
4391 - [`cargo doc` can now optionally document private types using the
4392 `--document-private-items` flag.][cargo/5543]
4396 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4397 the specified level to that level.][52354] For example `--cap-lints warn`
4398 will demote `deny` and `forbid` lints to `warn`.
4399 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4400 fails and `101` if there is a panic.][52197]
4401 - [A preview of clippy has been made available through rustup.][51122]
4402 You can install the preview with `rustup component add clippy-preview`.
4406 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4407 Use `str::get_unchecked(begin..end)` instead.
4408 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4409 Consider using the `home_dir` function from
4410 https://crates.io/crates/dirs instead.
4411 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4412 - [`cfg` attributes and `--cfg` command line flags are now more
4413 strictly validated.][53893]
4415 [53893]: https://github.com/rust-lang/rust/pull/53893/
4416 [52861]: https://github.com/rust-lang/rust/pull/52861/
4417 [51966]: https://github.com/rust-lang/rust/pull/51966/
4418 [52656]: https://github.com/rust-lang/rust/pull/52656/
4419 [52239]: https://github.com/rust-lang/rust/pull/52239/
4420 [52330]: https://github.com/rust-lang/rust/pull/52330/
4421 [52354]: https://github.com/rust-lang/rust/pull/52354/
4422 [52402]: https://github.com/rust-lang/rust/pull/52402/
4423 [52197]: https://github.com/rust-lang/rust/pull/52197/
4424 [51807]: https://github.com/rust-lang/rust/pull/51807/
4425 [51899]: https://github.com/rust-lang/rust/pull/51899/
4426 [51912]: https://github.com/rust-lang/rust/pull/51912/
4427 [51619]: https://github.com/rust-lang/rust/pull/51619/
4428 [51656]: https://github.com/rust-lang/rust/pull/51656/
4429 [51178]: https://github.com/rust-lang/rust/pull/51178/
4430 [51122]: https://github.com/rust-lang/rust/pull/51122
4431 [50494]: https://github.com/rust-lang/rust/pull/50494/
4432 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4433 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4434 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4435 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4436 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4437 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4438 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4441 Version 1.28.0 (2018-08-02)
4442 ===========================
4446 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4447 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4448 the inner type across Foreign Function Interface (FFI) boundaries.
4449 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4450 and can now be used as identifiers.][51196]
4451 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4452 stable.][51241] This will allow users to specify a global allocator for
4454 - [Unit test functions marked with the `#[test]` attribute can now return
4455 `Result<(), E: Debug>` in addition to `()`.][51298]
4456 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4457 allows macros to easily target lifetimes.
4461 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4462 prioritise making smaller binary sizes. `z` is the same as `s` with the
4463 exception that it does not vectorise loops, which typically results in an even
4465 - [The short error format is now stable.][49546] Specified with
4466 `--error-format=short` this option will provide a more compressed output of
4467 rust error messages.
4468 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4469 - [Reduced the number of allocations in the macro parser.][50855] This can
4470 improve compile times of macro heavy crates on average by 5%.
4474 - [Implemented `Default` for `&mut str`.][51306]
4475 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4476 - [Implemented `Extend` for `()`.][50234]
4477 - [The `Debug` implementation of `time::Duration` should now be more easily
4478 human readable.][50364] Previously a `Duration` of one second would printed as
4479 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4480 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4481 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4482 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4483 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4484 for `PathBuf`.][50170]
4485 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4486 and `Wrapping<i128>`.][50465]
4487 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4488 possible.][51050] This can provide up to a 40% speed increase.
4489 - [Improved error messages when using `format!`.][50610]
4493 - [`Iterator::step_by`]
4494 - [`Path::ancestors`]
4495 - [`SystemTime::UNIX_EPOCH`]
4496 - [`alloc::GlobalAlloc`]
4498 - [`alloc::LayoutErr`]
4501 - [`alloc::alloc_zeroed`]
4502 - [`alloc::dealloc`]
4503 - [`alloc::realloc`]
4504 - [`alloc::handle_alloc_error`]
4505 - [`btree_map::Entry::or_default`]
4506 - [`fmt::Alignment`]
4507 - [`hash_map::Entry::or_default`]
4508 - [`iter::repeat_with`]
4509 - [`num::NonZeroUsize`]
4510 - [`num::NonZeroU128`]
4511 - [`num::NonZeroU16`]
4512 - [`num::NonZeroU32`]
4513 - [`num::NonZeroU64`]
4514 - [`num::NonZeroU8`]
4515 - [`ops::RangeBounds`]
4516 - [`slice::SliceIndex`]
4517 - [`slice::from_mut`]
4518 - [`slice::from_ref`]
4519 - [`{Any + Send + Sync}::downcast_mut`]
4520 - [`{Any + Send + Sync}::downcast_ref`]
4521 - [`{Any + Send + Sync}::is`]
4525 - [Cargo will now no longer allow you to publish crates with build scripts that
4526 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4527 considered to be immutable.
4531 - [The `suggestion_applicability` field in `rustc`'s json output is now
4532 stable.][50486] This will allow dev tools to check whether a code suggestion
4533 would apply to them.
4537 - [Rust will consider trait objects with duplicated constraints to be the same
4538 type as without the duplicated constraint.][51276] For example the below code will
4539 now fail to compile.
4544 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4547 impl Trait + Send + Send {
4548 fn test(&self) { println!("two"); }
4552 [49546]: https://github.com/rust-lang/rust/pull/49546/
4553 [50143]: https://github.com/rust-lang/rust/pull/50143/
4554 [50170]: https://github.com/rust-lang/rust/pull/50170/
4555 [50234]: https://github.com/rust-lang/rust/pull/50234/
4556 [50265]: https://github.com/rust-lang/rust/pull/50265/
4557 [50364]: https://github.com/rust-lang/rust/pull/50364/
4558 [50385]: https://github.com/rust-lang/rust/pull/50385/
4559 [50465]: https://github.com/rust-lang/rust/pull/50465/
4560 [50486]: https://github.com/rust-lang/rust/pull/50486/
4561 [50554]: https://github.com/rust-lang/rust/pull/50554/
4562 [50610]: https://github.com/rust-lang/rust/pull/50610/
4563 [50855]: https://github.com/rust-lang/rust/pull/50855/
4564 [51050]: https://github.com/rust-lang/rust/pull/51050/
4565 [51196]: https://github.com/rust-lang/rust/pull/51196/
4566 [51241]: https://github.com/rust-lang/rust/pull/51241/
4567 [51276]: https://github.com/rust-lang/rust/pull/51276/
4568 [51298]: https://github.com/rust-lang/rust/pull/51298/
4569 [51306]: https://github.com/rust-lang/rust/pull/51306/
4570 [51562]: https://github.com/rust-lang/rust/pull/51562/
4571 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4572 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4573 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4574 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4575 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4576 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4577 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4578 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4579 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4580 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4581 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4582 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4583 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4584 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4585 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4586 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4587 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4588 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4589 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4590 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4591 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4592 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4593 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4594 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4595 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4596 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4597 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4598 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4599 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4600 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4602 Version 1.27.2 (2018-07-20)
4603 ===========================
4608 - The borrow checker was fixed to avoid potential unsoundness when using
4609 match ergonomics: [#52213][52213].
4611 [52213]: https://github.com/rust-lang/rust/issues/52213
4613 Version 1.27.1 (2018-07-10)
4614 ===========================
4619 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4620 when running, which enabled executing code as some other user on a
4621 given machine. This release fixes that vulnerability; you can read
4622 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4624 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4629 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4630 match ergonomics: [#51415][51415], [#49534][49534].
4632 [51415]: https://github.com/rust-lang/rust/issues/51415
4633 [49534]: https://github.com/rust-lang/rust/issues/49534
4634 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4635 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4637 Version 1.27.0 (2018-06-21)
4638 ==========================
4642 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4643 be used as an identifier.
4644 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4645 bare `Trait` syntax, and should make it clearer when being used in tandem with
4646 `impl Trait` because it is equivalent to the following syntax:
4647 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4648 `Box<Trait> == Box<dyn Trait>`.
4649 - [Attributes on generic parameters such as types and lifetimes are
4650 now stable.][48851] e.g.
4651 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4652 - [The `#[must_use]` attribute can now also be used on functions as well as
4653 types.][48925] It provides a lint that by default warns users when the
4654 value returned by a function has not been used.
4658 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4662 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4663 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4664 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4665 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4666 the `cfg` attribute.
4667 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4668 std are now available in core.][49896]
4669 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4671 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4672 that the operation isn't done in place.
4673 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4674 the `#[must_use]` attribute][49533] to warn about unused potentially
4675 expensive allocations.
4679 - [`DoubleEndedIterator::rfind`]
4680 - [`DoubleEndedIterator::rfold`]
4681 - [`DoubleEndedIterator::try_rfold`]
4682 - [`Duration::from_micros`]
4683 - [`Duration::from_nanos`]
4684 - [`Duration::subsec_micros`]
4685 - [`Duration::subsec_millis`]
4686 - [`HashMap::remove_entry`]
4687 - [`Iterator::try_fold`]
4688 - [`Iterator::try_for_each`]
4690 - [`Option::filter`]
4691 - [`String::replace_range`]
4692 - [`Take::set_limit`]
4693 - [`hint::unreachable_unchecked`]
4694 - [`os::unix::process::parent_id`]
4695 - [`ptr::swap_nonoverlapping`]
4696 - [`slice::rsplit_mut`]
4698 - [`slice::swap_with_slice`]
4702 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4703 `readme`, and `repository` fields.][cargo/5386]
4704 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4705 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4706 a different directory than `target` for placing compilation artifacts.
4707 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4708 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4709 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4710 where cargo would infer a binary, Cargo will produce a warning. You can
4711 disable this feature ahead of time by setting any of the following to false:
4712 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4713 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4714 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4718 - [Added “The Rustc book” into the official documentation.][49707]
4719 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4720 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4724 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4725 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4726 compile, `"".is_empty()` will still compile.
4727 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4728 will only print the inner type.][48553] E.g.
4729 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4730 not `AtomicBool(true)`.
4731 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4732 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4733 alignment should cover all use cases.
4734 - The `.description()` method on the `std::error::Error` trait
4735 [has been soft-deprecated][50163]. It is no longer required to implement it.
4737 [48553]: https://github.com/rust-lang/rust/pull/48553/
4738 [48851]: https://github.com/rust-lang/rust/pull/48851/
4739 [48925]: https://github.com/rust-lang/rust/pull/48925/
4740 [49533]: https://github.com/rust-lang/rust/pull/49533/
4741 [49623]: https://github.com/rust-lang/rust/pull/49623/
4742 [49630]: https://github.com/rust-lang/rust/pull/49630/
4743 [49664]: https://github.com/rust-lang/rust/pull/49664/
4744 [49699]: https://github.com/rust-lang/rust/pull/49699/
4745 [49707]: https://github.com/rust-lang/rust/pull/49707/
4746 [49896]: https://github.com/rust-lang/rust/pull/49896/
4747 [49968]: https://github.com/rust-lang/rust/pull/49968/
4748 [50163]: https://github.com/rust-lang/rust/pull/50163
4749 [50177]: https://github.com/rust-lang/rust/pull/50177/
4750 [50378]: https://github.com/rust-lang/rust/pull/50378/
4751 [50423]: https://github.com/rust-lang/rust/pull/50423/
4752 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4753 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4754 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4755 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4756 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4757 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4758 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4759 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4760 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4761 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4762 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4763 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4764 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4765 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4766 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4767 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4768 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4769 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4770 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4771 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4772 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4773 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4774 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4775 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4776 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4777 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4778 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4779 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4780 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4783 Version 1.26.2 (2018-06-05)
4784 ==========================
4789 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4791 [51117]: https://github.com/rust-lang/rust/issues/51117
4794 Version 1.26.1 (2018-05-29)
4795 ==========================
4800 - [RLS now works on Windows.][50646]
4801 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4807 - [`fn main() -> impl Trait` no longer works for non-Termination
4809 This reverts an accidental stabilization.
4810 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4811 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4813 [50646]: https://github.com/rust-lang/rust/issues/50646
4814 [50656]: https://github.com/rust-lang/rust/pull/50656
4815 [50812]: https://github.com/rust-lang/rust/pull/50812
4816 [50950]: https://github.com/rust-lang/rust/issues/50950
4817 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4819 Version 1.26.0 (2018-05-10)
4820 ==========================
4824 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4825 implement either or both traits.][49299]
4826 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4827 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4828 lifetime can be elided.][49458]
4829 - [`impl Trait` is now stable allowing you to have abstract types in returns
4830 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4831 `fn open(path: impl AsRef<Path>)`.
4832 - [Pattern matching will now automatically apply dereferences.][49394]
4833 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4834 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4835 - [A lot of operations are now available in a const context.][46882] E.g. You
4836 can now index into constant arrays, reference and dereference into constants,
4837 and use tuple struct constructors.
4838 - [Fixed entry slice patterns are now stable.][48516] E.g.
4840 let points = [1, 2, 3, 4];
4842 [1, 2, 3, 4] => println!("All points were sequential."),
4843 _ => println!("Not all points were sequential."),
4850 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4851 - [Fixed exponential projection complexity on nested types.][48296]
4852 This can provide up to a ~12% reduction in compile times for certain crates.
4853 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4854 to remap path prefixes outputted by the compiler.
4855 - [Added `powerpc-unknown-netbsd` target.][48281]
4859 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4860 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4861 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4862 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4863 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4864 - [`ascii::escape_default` is now available in libcore.][48735]
4865 - [Trailing commas are now supported in std and core macros.][48056]
4866 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4867 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4872 - [`*const T::copy_to_nonoverlapping`]
4873 - [`*const T::copy_to`]
4874 - [`*const T::read_unaligned`]
4875 - [`*const T::read_volatile`]
4876 - [`*const T::read`]
4878 - [`*const T::wrapping_add`]
4879 - [`*const T::wrapping_sub`]
4881 - [`*mut T::copy_to_nonoverlapping`]
4882 - [`*mut T::copy_to`]
4883 - [`*mut T::read_unaligned`]
4884 - [`*mut T::read_volatile`]
4886 - [`*mut T::replace`]
4889 - [`*mut T::wrapping_add`]
4890 - [`*mut T::wrapping_sub`]
4891 - [`*mut T::write_bytes`]
4892 - [`*mut T::write_unaligned`]
4893 - [`*mut T::write_volatile`]
4896 - [`FromUtf8Error::as_bytes`]
4897 - [`LocalKey::try_with`]
4898 - [`Option::cloned`]
4899 - [`btree_map::Entry::and_modify`]
4900 - [`fs::read_to_string`]
4903 - [`hash_map::Entry::and_modify`]
4904 - [`iter::FusedIterator`]
4905 - [`ops::RangeInclusive`]
4906 - [`ops::RangeToInclusive`]
4908 - [`slice::rotate_left`]
4909 - [`slice::rotate_right`]
4910 - [`String::retain`]
4915 - [Cargo will now output path to custom commands when `-v` is
4916 passed with `--list`][cargo/5041]
4917 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4921 - [The second edition of "The Rust Programming Language" book is now recommended
4922 over the first.][48404]
4927 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4928 syntax is now invalid.
4930 use std::ops::Fn as dyn;
4931 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4933 - [The result of dereferences are no longer promoted to `'static`.][47408]
4937 const PAIR: &(i32, i32) = &(0, 1);
4938 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4941 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4942 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4944 - [Removed hoedown from rustdoc.][48274]
4945 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4947 [46882]: https://github.com/rust-lang/rust/pull/46882
4948 [47379]: https://github.com/rust-lang/rust/pull/47379
4949 [47408]: https://github.com/rust-lang/rust/pull/47408
4950 [47813]: https://github.com/rust-lang/rust/pull/47813
4951 [48056]: https://github.com/rust-lang/rust/pull/48056
4952 [48125]: https://github.com/rust-lang/rust/pull/48125
4953 [48235]: https://github.com/rust-lang/rust/pull/48235
4954 [48274]: https://github.com/rust-lang/rust/pull/48274
4955 [48281]: https://github.com/rust-lang/rust/pull/48281
4956 [48296]: https://github.com/rust-lang/rust/pull/48296
4957 [48326]: https://github.com/rust-lang/rust/pull/48326
4958 [48359]: https://github.com/rust-lang/rust/pull/48359
4959 [48404]: https://github.com/rust-lang/rust/pull/48404
4960 [48481]: https://github.com/rust-lang/rust/pull/48481
4961 [48516]: https://github.com/rust-lang/rust/pull/48516
4962 [48628]: https://github.com/rust-lang/rust/pull/48628
4963 [48629]: https://github.com/rust-lang/rust/pull/48629
4964 [48657]: https://github.com/rust-lang/rust/pull/48657
4965 [48735]: https://github.com/rust-lang/rust/pull/48735
4966 [48978]: https://github.com/rust-lang/rust/pull/48978
4967 [49101]: https://github.com/rust-lang/rust/pull/49101
4968 [49109]: https://github.com/rust-lang/rust/pull/49109
4969 [49162]: https://github.com/rust-lang/rust/pull/49162
4970 [49255]: https://github.com/rust-lang/rust/pull/49255
4971 [49299]: https://github.com/rust-lang/rust/pull/49299
4972 [49305]: https://github.com/rust-lang/rust/pull/49305
4973 [49394]: https://github.com/rust-lang/rust/pull/49394
4974 [49458]: https://github.com/rust-lang/rust/pull/49458
4975 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4976 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4977 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4978 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4979 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4980 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4981 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4982 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4983 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4984 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4985 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4986 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4987 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4988 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4989 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4990 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4991 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4992 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4993 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4994 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4995 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4996 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4997 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4998 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4999 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5000 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5001 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5002 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5003 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5004 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5005 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5006 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5007 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5008 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5009 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5010 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5011 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5012 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5013 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5014 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5015 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5016 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5019 Version 1.25.0 (2018-03-29)
5020 ==========================
5024 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5025 - [You can now use nested groups of imports.][47948]
5026 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5027 - [You can now have `|` at the start of a match arm.][47947] e.g.
5029 enum Foo { A, B, C }
5035 | Foo::B => println!("AB"),
5036 | Foo::C => println!("C"),
5043 - [Upgraded to LLVM 6.][47828]
5044 - [Added `-C lto=val` option.][47521]
5045 - [Added `i586-unknown-linux-musl` target][47282]
5049 - [Impl Send for `process::Command` on Unix.][47760]
5050 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5051 - [`UnsafeCell::into_inner` is now safe.][47204]
5052 - [Implement libstd for CloudABI.][47268]
5053 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5054 - [Implement `AsRef<Path>` for Component][46985]
5055 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5056 - [Moved `Duration` to libcore.][46666]
5060 - [`Location::column`]
5063 The following functions can now be used in a constant expression.
5064 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5065 - [`Duration::new`][47300]
5066 - [`Duration::from_secs`][47300]
5067 - [`Duration::from_millis`][47300]
5071 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5072 - [`cargo new` now defaults to creating a binary crate, instead of a
5073 library crate.][cargo/5029]
5077 - [Rust by example is now shipped with new releases][46196]
5081 - [Deprecated `net::lookup_host`.][47510]
5082 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5083 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5084 around indexing operations (see [#47349][47349]). This has been fixed (which also
5085 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5086 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5088 [33903]: https://github.com/rust-lang/rust/pull/33903
5089 [47947]: https://github.com/rust-lang/rust/pull/47947
5090 [47948]: https://github.com/rust-lang/rust/pull/47948
5091 [47760]: https://github.com/rust-lang/rust/pull/47760
5092 [47790]: https://github.com/rust-lang/rust/pull/47790
5093 [47828]: https://github.com/rust-lang/rust/pull/47828
5094 [47398]: https://github.com/rust-lang/rust/pull/47398
5095 [47510]: https://github.com/rust-lang/rust/pull/47510
5096 [47521]: https://github.com/rust-lang/rust/pull/47521
5097 [47204]: https://github.com/rust-lang/rust/pull/47204
5098 [47251]: https://github.com/rust-lang/rust/pull/47251
5099 [47268]: https://github.com/rust-lang/rust/pull/47268
5100 [47282]: https://github.com/rust-lang/rust/pull/47282
5101 [47300]: https://github.com/rust-lang/rust/pull/47300
5102 [47349]: https://github.com/rust-lang/rust/pull/47349
5103 [46931]: https://github.com/rust-lang/rust/pull/46931
5104 [46985]: https://github.com/rust-lang/rust/pull/46985
5105 [47006]: https://github.com/rust-lang/rust/pull/47006
5106 [46830]: https://github.com/rust-lang/rust/pull/46830
5107 [46095]: https://github.com/rust-lang/rust/pull/46095
5108 [46666]: https://github.com/rust-lang/rust/pull/46666
5109 [46196]: https://github.com/rust-lang/rust/pull/46196
5110 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5111 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5112 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5113 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5114 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5117 Version 1.24.1 (2018-03-01)
5118 ==========================
5120 - [Do not abort when unwinding through FFI][48251]
5121 - [Emit UTF-16 files for linker arguments on Windows][48318]
5122 - [Make the error index generator work again][48308]
5123 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5125 [48251]: https://github.com/rust-lang/rust/issues/48251
5126 [48308]: https://github.com/rust-lang/rust/issues/48308
5127 [48318]: https://github.com/rust-lang/rust/issues/48318
5128 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5131 Version 1.24.0 (2018-02-15)
5132 ==========================
5136 - [External `sysv64` ffi is now available.][46528]
5137 eg. `extern "sysv64" fn foo () {}`
5141 - [rustc now uses 16 codegen units by default for release builds.][46910]
5142 For the fastest builds, utilize `codegen-units=1`.
5143 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5144 - [Add `aarch64-unknown-openbsd` support][46760]
5148 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5149 improvement in performance in the majority of cases.
5150 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5151 with Windows.][46798]
5152 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5153 - [impl `From<bool>` for `AtomicBool`][46293]
5154 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5155 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5156 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5157 - [float::from_bits now just uses transmute.][46012] This provides
5158 some optimisations from LLVM.
5159 - [Copied `AsciiExt` methods onto `char`][46077]
5160 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5161 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5162 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5163 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5167 - [`RefCell::replace`]
5169 - [`atomic::spin_loop_hint`]
5171 The following functions can now be used in a constant expression.
5172 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5174 - [`AtomicBool::new`][46287]
5175 - [`AtomicUsize::new`][46287]
5176 - [`AtomicIsize::new`][46287]
5177 - [`AtomicPtr::new`][46287]
5178 - [`Cell::new`][46287]
5179 - [`{integer}::min_value`][46287]
5180 - [`{integer}::max_value`][46287]
5181 - [`mem::size_of`][46287]
5182 - [`mem::align_of`][46287]
5183 - [`ptr::null`][46287]
5184 - [`ptr::null_mut`][46287]
5185 - [`RefCell::new`][46287]
5186 - [`UnsafeCell::new`][46287]
5190 - [Added a `workspace.default-members` config that
5191 overrides implied `--all` in virtual workspaces.][cargo/4743]
5192 - [Enable incremental by default on development builds.][cargo/4817] Also added
5193 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5194 per-project or global basis respectively.
5201 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5202 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5203 in accordance with IETF RFC 4291 §2.2.
5204 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5205 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5206 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5207 - [Leading zeros in tuple struct members is now an error][47084]
5208 - [`column!()` macro is one-based instead of zero-based][46977]
5209 - [`fmt::Arguments` can no longer be shared across threads][45198]
5210 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5211 - [Cargo sets a different working directory for the compiler][cargo/4788]
5213 [44884]: https://github.com/rust-lang/rust/pull/44884
5214 [45198]: https://github.com/rust-lang/rust/pull/45198
5215 [45506]: https://github.com/rust-lang/rust/pull/45506
5216 [45990]: https://github.com/rust-lang/rust/pull/45990
5217 [46012]: https://github.com/rust-lang/rust/pull/46012
5218 [46077]: https://github.com/rust-lang/rust/pull/46077
5219 [46094]: https://github.com/rust-lang/rust/pull/46094
5220 [46284]: https://github.com/rust-lang/rust/pull/46284
5221 [46287]: https://github.com/rust-lang/rust/pull/46287
5222 [46293]: https://github.com/rust-lang/rust/pull/46293
5223 [46528]: https://github.com/rust-lang/rust/pull/46528
5224 [46671]: https://github.com/rust-lang/rust/pull/46671
5225 [46713]: https://github.com/rust-lang/rust/pull/46713
5226 [46735]: https://github.com/rust-lang/rust/pull/46735
5227 [46760]: https://github.com/rust-lang/rust/pull/46760
5228 [46798]: https://github.com/rust-lang/rust/pull/46798
5229 [46828]: https://github.com/rust-lang/rust/pull/46828
5230 [46831]: https://github.com/rust-lang/rust/pull/46831
5231 [46833]: https://github.com/rust-lang/rust/pull/46833
5232 [46910]: https://github.com/rust-lang/rust/pull/46910
5233 [46977]: https://github.com/rust-lang/rust/pull/46977
5234 [47018]: https://github.com/rust-lang/rust/pull/47018
5235 [47080]: https://github.com/rust-lang/rust/pull/47080
5236 [47084]: https://github.com/rust-lang/rust/pull/47084
5237 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5238 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5239 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5240 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5241 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5242 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5245 Version 1.23.0 (2018-01-04)
5246 ==========================
5250 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5251 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5252 Which should fix some confusing errors in some operations.
5256 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5257 undefined behavior.][45920]
5258 - [rustc now suggests renaming import if names clash.][45660]
5259 - [Display errors/warnings correctly when there are zero-width or
5260 wide characters.][45711]
5261 - [rustc now avoids unnecessary copies of arguments that are
5262 simple bindings][45380] This should improve memory usage on average by 5-10%.
5263 - [Updated musl used to build musl rustc to 1.1.17][45393]
5267 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5268 - [Implement Hash for raw pointers to unsized types][45483]
5269 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5270 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5271 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5272 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5273 and `<*mut T>::as_mut`][44932]
5274 - [Optimized `Thread::{park, unpark}` implementation][45524]
5275 - [Improved `SliceExt::binary_search` performance.][45333]
5276 - [impl `FromIterator<()>` for `()`][45379]
5277 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5285 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5286 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5287 - [Added unit test checking to `cargo check`][cargo/4592]
5288 - [Cargo now lets you install a specific version
5289 using `cargo install --version`][cargo/4637]
5293 - [Releases now ship with the Cargo book documentation.][45692]
5294 - [rustdoc now prints rendering warnings on every run.][45324]
5298 - [Changes have been made to type equality to make it more correct,
5299 in rare cases this could break some code.][45853] [Tracking issue for
5300 further information][45852]
5301 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5302 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5303 Android 9, the minimum supported version is Android 14.
5304 - [Bumped the minimum LLVM to 3.9][45326]
5306 [44042]: https://github.com/rust-lang/rust/pull/44042
5307 [44932]: https://github.com/rust-lang/rust/pull/44932
5308 [45267]: https://github.com/rust-lang/rust/pull/45267
5309 [45324]: https://github.com/rust-lang/rust/pull/45324
5310 [45326]: https://github.com/rust-lang/rust/pull/45326
5311 [45333]: https://github.com/rust-lang/rust/pull/45333
5312 [45379]: https://github.com/rust-lang/rust/pull/45379
5313 [45380]: https://github.com/rust-lang/rust/pull/45380
5314 [45393]: https://github.com/rust-lang/rust/pull/45393
5315 [45435]: https://github.com/rust-lang/rust/pull/45435
5316 [45483]: https://github.com/rust-lang/rust/pull/45483
5317 [45524]: https://github.com/rust-lang/rust/pull/45524
5318 [45571]: https://github.com/rust-lang/rust/pull/45571
5319 [45580]: https://github.com/rust-lang/rust/pull/45580
5320 [45610]: https://github.com/rust-lang/rust/pull/45610
5321 [45660]: https://github.com/rust-lang/rust/pull/45660
5322 [45692]: https://github.com/rust-lang/rust/pull/45692
5323 [45711]: https://github.com/rust-lang/rust/pull/45711
5324 [45772]: https://github.com/rust-lang/rust/pull/45772
5325 [45852]: https://github.com/rust-lang/rust/issues/45852
5326 [45853]: https://github.com/rust-lang/rust/pull/45853
5327 [45887]: https://github.com/rust-lang/rust/pull/45887
5328 [45920]: https://github.com/rust-lang/rust/pull/45920
5329 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5330 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5331 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5334 Version 1.22.1 (2017-11-22)
5335 ==========================
5337 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5339 [46183]: https://github.com/rust-lang/rust/pull/46183
5341 Version 1.22.0 (2017-11-22)
5342 ==========================
5346 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5347 - [Now accepts underscores in unicode escapes][43716]
5348 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5349 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5353 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5354 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5355 This should decrease compile times for debug builds.
5356 - [strict memory alignment now enabled on ARMv6][45094]
5357 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5361 - [Allow atomic operations up to 32 bits
5362 on `armv5te_unknown_linux_gnueabi`][44978]
5363 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5364 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5365 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5366 - [Properly detect overflow in `Instant += Duration`.][44220]
5367 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5368 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5369 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5376 - [Cargo will now build multi file examples in subdirectories of the `examples`
5377 folder that have a `main.rs` file.][cargo/4496]
5378 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5379 the old format will continue to work and can be updated with `cargo update`.
5380 - [Now supports vendoring git repositories][cargo/3992]
5384 - [`libbacktrace` is now available on Apple platforms.][44251]
5385 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5386 This now lets you specify that a given code example will fail to compile.
5390 - [The minimum Android version that rustc can build for has been bumped
5391 to `4.0` from `2.3`][45656]
5392 - [Allowing `T op= &T` for numeric types has broken some type
5393 inference cases][45480]
5396 [42526]: https://github.com/rust-lang/rust/pull/42526
5397 [43716]: https://github.com/rust-lang/rust/pull/43716
5398 [43949]: https://github.com/rust-lang/rust/pull/43949
5399 [44015]: https://github.com/rust-lang/rust/pull/44015
5400 [44220]: https://github.com/rust-lang/rust/pull/44220
5401 [44251]: https://github.com/rust-lang/rust/pull/44251
5402 [44287]: https://github.com/rust-lang/rust/pull/44287
5403 [44303]: https://github.com/rust-lang/rust/pull/44303
5404 [44456]: https://github.com/rust-lang/rust/pull/44456
5405 [44466]: https://github.com/rust-lang/rust/pull/44466
5406 [44895]: https://github.com/rust-lang/rust/pull/44895
5407 [44966]: https://github.com/rust-lang/rust/pull/44966
5408 [44978]: https://github.com/rust-lang/rust/pull/44978
5409 [45041]: https://github.com/rust-lang/rust/pull/45041
5410 [45064]: https://github.com/rust-lang/rust/pull/45064
5411 [45075]: https://github.com/rust-lang/rust/pull/45075
5412 [45094]: https://github.com/rust-lang/rust/pull/45094
5413 [45095]: https://github.com/rust-lang/rust/pull/45095
5414 [45480]: https://github.com/rust-lang/rust/issues/45480
5415 [45656]: https://github.com/rust-lang/rust/pull/45656
5416 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5417 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5418 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5425 Version 1.21.0 (2017-10-12)
5426 ==========================
5430 - [You can now use static references for literals.][43838]
5434 let x: &'static u32 = &0;
5437 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5440 my_macro!(Vec<i32>::new); // Always worked
5441 my_macro!(Vec::<i32>::new); // Now works
5446 - [Upgraded jemalloc to 4.5.0][43911]
5447 - [Enabled unwinding panics on Redox][43917]
5448 - [Now runs LLVM in parallel during translation phase.][43506]
5449 This should reduce peak memory usage.
5453 - [Generate builtin impls for `Clone` for all arrays and tuples that
5454 are `T: Clone`][43690]
5455 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5456 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5457 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5462 [`std::mem::discriminant`]
5466 - [You can now call `cargo install` with multiple package names][cargo/4216]
5467 - [Cargo commands inside a virtual workspace will now implicitly
5468 pass `--all`][cargo/4335]
5469 - [Added a `[patch]` section to `Cargo.toml` to handle
5470 prepublication dependencies][cargo/4123] [RFC 1969]
5471 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5472 like patterns][cargo/4270]
5473 - [Added the `--all-targets` option][cargo/4400]
5474 - [Using required dependencies as a feature is now deprecated and emits
5475 a warning][cargo/4364]
5480 - [Cargo docs are moving][43916]
5481 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5482 - [The rustdoc book is now available][43863]
5483 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5484 - [Added a preview of RLS has been made available through rustup][44204]
5485 Install with `rustup component add rls-preview`
5486 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5487 Previously only showed `std::os::unix`.
5491 - [Changes in method matching against higher-ranked types][43880] This may cause
5492 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5493 - [rustc's JSON error output's byte position start at top of file.][42973]
5494 Was previously relative to the rustc's internal `CodeMap` struct which
5495 required the unstable library `libsyntax` to correctly use.
5496 - [`unused_results` lint no longer ignores booleans][43728]
5498 [42565]: https://github.com/rust-lang/rust/pull/42565
5499 [42973]: https://github.com/rust-lang/rust/pull/42973
5500 [43348]: https://github.com/rust-lang/rust/pull/43348
5501 [43459]: https://github.com/rust-lang/rust/pull/43459
5502 [43506]: https://github.com/rust-lang/rust/pull/43506
5503 [43540]: https://github.com/rust-lang/rust/pull/43540
5504 [43690]: https://github.com/rust-lang/rust/pull/43690
5505 [43728]: https://github.com/rust-lang/rust/pull/43728
5506 [43838]: https://github.com/rust-lang/rust/pull/43838
5507 [43863]: https://github.com/rust-lang/rust/pull/43863
5508 [43880]: https://github.com/rust-lang/rust/pull/43880
5509 [43911]: https://github.com/rust-lang/rust/pull/43911
5510 [43916]: https://github.com/rust-lang/rust/pull/43916
5511 [43917]: https://github.com/rust-lang/rust/pull/43917
5512 [44204]: https://github.com/rust-lang/rust/pull/44204
5513 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5514 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5515 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5516 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5517 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5518 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5519 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5520 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5521 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5523 Version 1.20.0 (2017-08-31)
5524 ===========================
5528 - [Associated constants are now stabilised.][42809]
5529 - [A lot of macro bugs are now fixed.][42913]
5534 - [Struct fields are now properly coerced to the expected field type.][42807]
5535 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5536 `wasm32-experimental-emscripten` target.
5537 - [Changed some of the error messages to be more helpful.][42033]
5538 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5540 - [rustc now reports the total number of errors on compilation failure][43015]
5541 previously this was only the number of errors in the pass that failed.
5542 - [Expansion in rustc has been sped up 29x.][42533]
5543 - [added `msp430-none-elf` target.][43099]
5544 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5546 - [Fixes backtraces on Redox][43228]
5547 - [rustc now identifies different versions of same crate when absolute paths of
5548 different types match in an error message.][42826]
5554 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5555 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5557 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5558 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5559 - [Impl `Clone` for `DefaultHasher`.][42799]
5560 - [Impl `Sync` for `SyncSender`.][42397]
5561 - [Impl `FromStr` for `char`][42271]
5562 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5564 - [allow messages in the `unimplemented!()` macro.][42155]
5565 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5566 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5567 - [Upgrade to Unicode 10.0.0][42999]
5568 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5569 - [Skip the main thread's manual stack guard on Linux][43072]
5570 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5571 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5573 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5578 - [`CStr::into_c_string`]
5579 - [`CString::as_c_str`]
5580 - [`CString::into_boxed_c_str`]
5581 - [`Chain::get_mut`]
5582 - [`Chain::get_ref`]
5583 - [`Chain::into_inner`]
5584 - [`Option::get_or_insert_with`]
5585 - [`Option::get_or_insert`]
5586 - [`OsStr::into_os_string`]
5587 - [`OsString::into_boxed_os_str`]
5590 - [`Utf8Error::error_len`]
5591 - [`char::EscapeDebug`]
5592 - [`char::escape_debug`]
5593 - [`compile_error!`]
5594 - [`f32::from_bits`]
5596 - [`f64::from_bits`]
5598 - [`mem::ManuallyDrop`]
5599 - [`slice::sort_unstable_by_key`]
5600 - [`slice::sort_unstable_by`]
5601 - [`slice::sort_unstable`]
5602 - [`str::from_boxed_utf8_unchecked`]
5603 - [`str::as_bytes_mut`]
5604 - [`str::as_bytes_mut`]
5605 - [`str::from_utf8_mut`]
5606 - [`str::from_utf8_unchecked_mut`]
5608 - [`str::get_unchecked_mut`]
5609 - [`str::get_unchecked`]
5611 - [`str::into_boxed_bytes`]
5616 - [Cargo API token location moved from `~/.cargo/config` to
5617 `~/.cargo/credentials`.][cargo/3978]
5618 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5619 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5620 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5621 - [You can now specify version of a binary when installed through
5622 `cargo install` using `--vers`.][cargo/4229]
5623 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5624 failure.][cargo/4248]
5625 - [Changed the convention around which file is the crate root.][cargo/4259]
5630 - [Functions with `'static` in their return types will now not be as usable as
5631 if they were using lifetime parameters instead.][42417]
5632 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5633 takes the sign of NaN into account where previously didn't.][42430]
5635 [42033]: https://github.com/rust-lang/rust/pull/42033
5636 [42155]: https://github.com/rust-lang/rust/pull/42155
5637 [42271]: https://github.com/rust-lang/rust/pull/42271
5638 [42397]: https://github.com/rust-lang/rust/pull/42397
5639 [42417]: https://github.com/rust-lang/rust/pull/42417
5640 [42430]: https://github.com/rust-lang/rust/pull/42430
5641 [42431]: https://github.com/rust-lang/rust/pull/42431
5642 [42533]: https://github.com/rust-lang/rust/pull/42533
5643 [42571]: https://github.com/rust-lang/rust/pull/42571
5644 [42613]: https://github.com/rust-lang/rust/pull/42613
5645 [42799]: https://github.com/rust-lang/rust/pull/42799
5646 [42807]: https://github.com/rust-lang/rust/pull/42807
5647 [42809]: https://github.com/rust-lang/rust/pull/42809
5648 [42822]: https://github.com/rust-lang/rust/pull/42822
5649 [42826]: https://github.com/rust-lang/rust/pull/42826
5650 [42854]: https://github.com/rust-lang/rust/pull/42854
5651 [42913]: https://github.com/rust-lang/rust/pull/42913
5652 [42999]: https://github.com/rust-lang/rust/pull/42999
5653 [43011]: https://github.com/rust-lang/rust/pull/43011
5654 [43015]: https://github.com/rust-lang/rust/pull/43015
5655 [43072]: https://github.com/rust-lang/rust/pull/43072
5656 [43077]: https://github.com/rust-lang/rust/pull/43077
5657 [43097]: https://github.com/rust-lang/rust/pull/43097
5658 [43099]: https://github.com/rust-lang/rust/pull/43099
5659 [43170]: https://github.com/rust-lang/rust/pull/43170
5660 [43178]: https://github.com/rust-lang/rust/pull/43178
5661 [43185]: https://github.com/rust-lang/rust/pull/43185
5662 [43228]: https://github.com/rust-lang/rust/pull/43228
5663 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5664 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5665 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5666 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5667 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5668 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5669 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5670 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5671 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5672 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5673 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5674 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5675 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5676 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5677 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5678 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5679 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5680 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5681 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5682 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5683 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5684 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5685 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5686 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5687 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5688 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5689 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5690 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5691 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5692 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5693 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5694 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5695 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5696 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5697 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5698 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5699 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5700 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5703 Version 1.19.0 (2017-07-20)
5704 ===========================
5709 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5710 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5711 - [Macro recursion limit increased to 1024 from 64.][41676]
5712 - [Added lint for detecting unused macros.][41907]
5713 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5714 For example: `let x = loop { break 7; };`
5715 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5716 contain `Copy` types and cannot have a `Drop` implementation.
5717 Example: `union Foo { bar: u8, baz: usize }`
5718 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5719 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5724 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5725 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5726 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5727 you should use `--target armv7-linux-androideabi`.
5728 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5729 - [Minor optimisation of string operations.][42037]
5730 - [Compiler error message is now `aborting due to previous error(s)` instead of
5731 `aborting due to N previous errors`][42150] This was previously inaccurate and
5732 would only count certain kinds of errors.
5733 - [The compiler now supports Visual Studio 2017][42225]
5734 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5735 - [Added a lot][42264] of [new error codes][42302]
5736 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5737 libraries with C Run-time Libraries(CRT) to be statically linked.
5738 - [Fixed various ARM codegen bugs][42740]
5743 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5744 `Extend<Cow<'a, str>>`][41449]
5745 - [`Vec` now implements `From<&mut [T]>`][41530]
5746 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5747 - [`SplitWhitespace` now implements `Clone`][41659]
5748 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5750 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5751 macros, but for printing to stderr.
5756 - [`OsString::shrink_to_fit`]
5759 - [`thread::ThreadId`]
5764 - [Build scripts can now add environment variables to the environment
5765 the crate is being compiled in.
5766 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5767 - [Subcommands now replace the current process rather than spawning a new
5768 child process][cargo/3970]
5769 - [Workspace members can now accept glob file patterns][cargo/3979]
5770 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5771 the members in a given workspace.][cargo/3988]
5772 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5773 - [Target directory path is now in the cargo metadata][cargo/4022]
5774 - [Cargo no longer checks out a local working directory for the
5775 crates.io index][cargo/4026] This should provide smaller file size for the
5776 registry, and improve cloning times, especially on Windows machines.
5777 - [Added an `--exclude` option for excluding certain packages when using the
5778 `--all` option][cargo/4031]
5779 - [Cargo will now automatically retry when receiving a 5xx error
5780 from crates.io][cargo/4032]
5781 - [The `--features` option now accepts multiple comma or space
5782 delimited values.][cargo/4084]
5783 - [Added support for custom target specific runners][cargo/3954]
5788 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5790 - [Rust will now release XZ compressed packages][rust-installer/57]
5791 - [rustup will now prefer to download rust packages with
5792 XZ compression][rustup/1100] over GZip packages.
5793 - [Added the ability to escape `#` in rust documentation][41785] By adding
5794 additional `#`'s ie. `##` is now `#`
5799 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5800 - [`-Z` flags are now no longer allowed to be used on the stable
5801 compiler.][41751] This has been a warning for a year previous to this.
5802 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5803 longer works][42844]. Users should migrate to the built-in `check`
5804 command, which has been available since 1.16.
5805 - [Ending a float literal with `._` is now a hard error.
5806 Example: `42._` .][41946]
5807 - [Any use of a private `extern crate` outside of its module is now a
5808 hard error.][36886] This was previously a warning.
5809 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5810 relative while the `::` prefix makes a path absolute, but was ignored and the
5811 path was relative regardless.
5812 - [Floating point constants in match patterns is now a hard error][36890]
5813 This was previously a warning.
5814 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5815 match patterns is now a hard error][36891] This was previously a warning.
5816 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5818 - [From the pound escape, lines consisting of multiple `#`s are
5820 - [It is an error to re-export private enum variants][42460]. This is
5821 known to break a number of crates that depend on an older version of
5823 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5824 to use it to find the linker, and the build will fail where it did
5825 not previously][42607]
5827 [36886]: https://github.com/rust-lang/rust/issues/36886
5828 [36888]: https://github.com/rust-lang/rust/issues/36888
5829 [36890]: https://github.com/rust-lang/rust/issues/36890
5830 [36891]: https://github.com/rust-lang/rust/issues/36891
5831 [36892]: https://github.com/rust-lang/rust/issues/36892
5832 [37406]: https://github.com/rust-lang/rust/issues/37406
5833 [39983]: https://github.com/rust-lang/rust/pull/39983
5834 [41145]: https://github.com/rust-lang/rust/pull/41145
5835 [41192]: https://github.com/rust-lang/rust/pull/41192
5836 [41258]: https://github.com/rust-lang/rust/pull/41258
5837 [41370]: https://github.com/rust-lang/rust/pull/41370
5838 [41449]: https://github.com/rust-lang/rust/pull/41449
5839 [41530]: https://github.com/rust-lang/rust/pull/41530
5840 [41624]: https://github.com/rust-lang/rust/pull/41624
5841 [41656]: https://github.com/rust-lang/rust/pull/41656
5842 [41659]: https://github.com/rust-lang/rust/pull/41659
5843 [41676]: https://github.com/rust-lang/rust/pull/41676
5844 [41751]: https://github.com/rust-lang/rust/pull/41751
5845 [41764]: https://github.com/rust-lang/rust/pull/41764
5846 [41785]: https://github.com/rust-lang/rust/pull/41785
5847 [41873]: https://github.com/rust-lang/rust/pull/41873
5848 [41907]: https://github.com/rust-lang/rust/pull/41907
5849 [41946]: https://github.com/rust-lang/rust/pull/41946
5850 [42016]: https://github.com/rust-lang/rust/pull/42016
5851 [42037]: https://github.com/rust-lang/rust/pull/42037
5852 [42068]: https://github.com/rust-lang/rust/pull/42068
5853 [42150]: https://github.com/rust-lang/rust/pull/42150
5854 [42162]: https://github.com/rust-lang/rust/pull/42162
5855 [42225]: https://github.com/rust-lang/rust/pull/42225
5856 [42264]: https://github.com/rust-lang/rust/pull/42264
5857 [42302]: https://github.com/rust-lang/rust/pull/42302
5858 [42460]: https://github.com/rust-lang/rust/issues/42460
5859 [42607]: https://github.com/rust-lang/rust/issues/42607
5860 [42740]: https://github.com/rust-lang/rust/pull/42740
5861 [42844]: https://github.com/rust-lang/rust/issues/42844
5862 [42948]: https://github.com/rust-lang/rust/pull/42948
5863 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5864 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5865 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5866 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5867 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5868 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5869 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5870 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5871 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5872 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5873 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5874 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5875 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5876 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5877 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5878 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5879 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5880 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5881 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5882 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5883 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5884 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5887 Version 1.18.0 (2017-06-08)
5888 ===========================
5893 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5894 make the item visible to just that module tree. Also accepts the keyword
5895 `crate` to make something public to the whole crate but not users of the
5896 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5897 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5898 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5899 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5900 types like `Write + Send`, trailing `+` are now supported in trait objects,
5901 and better error reporting for trait objects starting with `?Sized`.
5902 - [0e+10 is now a valid floating point literal][40589]
5903 - [Now warns if you bind a lifetime parameter to 'static][40734]
5904 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5905 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5906 representation in some cases.][40377]
5911 - [rustc can now emit mir with `--emit mir`][39891]
5912 - [Improved LLVM IR for trivial functions][40367]
5913 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5914 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5915 opportunities found through profiling
5916 - [Improved backtrace formatting when panicking][38165]
5921 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5922 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5923 iteration or reallocation.
5924 - [Simplified HashMap Bucket interface][40561] provides performance
5925 improvements for iterating and cloning.
5926 - [Specialize Vec::from_elem to use calloc][40409]
5927 - [Fixed Race condition in fs::create_dir_all][39799]
5928 - [No longer caching stdio on Windows][40516]
5929 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5930 2.50%~ faster and in one case now 12.50% faster.
5931 - [Optimized `AtomicBool::fetch_nand`][41143]
5936 - [`Child::try_wait`]
5937 - [`HashMap::retain`]
5938 - [`HashSet::retain`]
5940 - [`TcpStream::peek`]
5941 - [`UdpSocket::peek`]
5942 - [`UdpSocket::peek_from`]
5947 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5948 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5949 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5950 - [Added Android build support][cargo/3885]
5951 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5952 of a certain type, for example `cargo build --bins` will build all
5954 - [Added support for haiku][cargo/3952]
5959 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5960 - [Rust now uses the official cross compiler for NetBSD][40612]
5961 - [rustdoc now accepts `#` at the start of files][40828]
5962 - [Fixed jemalloc support for musl][41168]
5967 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5968 always placed after the sign if it exists and before the digits. With the `#`
5969 flag the zeroes are placed after the prefix and before the digits.
5970 - [Due to the struct field optimisation][40377], using `transmute` on structs
5971 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5972 always been undefined behavior, but is now more likely to break in practice.
5973 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5974 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5975 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5976 - [Overlapping inherent `impl`s are now a hard error][40728]
5977 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5978 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5979 `out.asm` and `out.ll` instead of only one of the filetypes.
5980 - [ calling a function that returns `Self` will no longer work][41805] when
5981 the size of `Self` cannot be statically determined.
5982 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5983 this has caused a few regressions namely:
5985 - Changed the link order of local static/dynamic libraries (respecting the
5986 order on given rather than having the compiler reorder).
5987 - Changed how MinGW is linked, native code linked to dynamic libraries
5988 may require manually linking to the gcc support library (for the native
5991 [38165]: https://github.com/rust-lang/rust/pull/38165
5992 [39799]: https://github.com/rust-lang/rust/pull/39799
5993 [39891]: https://github.com/rust-lang/rust/pull/39891
5994 [40043]: https://github.com/rust-lang/rust/pull/40043
5995 [40241]: https://github.com/rust-lang/rust/pull/40241
5996 [40338]: https://github.com/rust-lang/rust/pull/40338
5997 [40367]: https://github.com/rust-lang/rust/pull/40367
5998 [40377]: https://github.com/rust-lang/rust/pull/40377
5999 [40409]: https://github.com/rust-lang/rust/pull/40409
6000 [40516]: https://github.com/rust-lang/rust/pull/40516
6001 [40556]: https://github.com/rust-lang/rust/pull/40556
6002 [40561]: https://github.com/rust-lang/rust/pull/40561
6003 [40589]: https://github.com/rust-lang/rust/pull/40589
6004 [40612]: https://github.com/rust-lang/rust/pull/40612
6005 [40723]: https://github.com/rust-lang/rust/pull/40723
6006 [40728]: https://github.com/rust-lang/rust/pull/40728
6007 [40731]: https://github.com/rust-lang/rust/pull/40731
6008 [40734]: https://github.com/rust-lang/rust/pull/40734
6009 [40805]: https://github.com/rust-lang/rust/pull/40805
6010 [40807]: https://github.com/rust-lang/rust/pull/40807
6011 [40828]: https://github.com/rust-lang/rust/pull/40828
6012 [40870]: https://github.com/rust-lang/rust/pull/40870
6013 [41085]: https://github.com/rust-lang/rust/pull/41085
6014 [41143]: https://github.com/rust-lang/rust/pull/41143
6015 [41168]: https://github.com/rust-lang/rust/pull/41168
6016 [41270]: https://github.com/rust-lang/rust/issues/41270
6017 [41469]: https://github.com/rust-lang/rust/pull/41469
6018 [41805]: https://github.com/rust-lang/rust/issues/41805
6019 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6020 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6021 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6022 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6023 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6024 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6025 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6026 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6027 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6028 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6029 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6030 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6031 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6032 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6035 Version 1.17.0 (2017-04-27)
6036 ===========================
6041 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6042 * [Fields of structs may be initialized without duplicating the field/variable
6043 names][39761]. [RFC 1682]
6044 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6045 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6046 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6047 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6048 `'b`. Soundness fix.
6049 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6050 * [Static variables may contain references to other statics][40027]
6055 * [Exit quickly on only `--emit dep-info`][40336]
6056 * [Make `-C relocation-model` more correctly determine whether the linker
6057 creates a position-independent executable][40245]
6058 * [Add `-C overflow-checks` to directly control whether integer overflow
6060 * [The rustc type checker now checks items on demand instead of in a single
6061 in-order pass][40008]. This is mostly an internal refactoring in support of
6062 future work, including incremental type checking, but also resolves [RFC
6063 1647], allowing `Self` to appear in `impl` `where` clauses.
6064 * [Optimize vtable loads][39995]
6065 * [Turn off vectorization for Emscripten targets][39990]
6066 * [Provide suggestions for unknown macros imported with `use`][39953]
6067 * [Fix ICEs in path resolution][39939]
6068 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6069 * [Add clearer error message using `&str + &str`][39116]
6080 * [`Ordering::then`]
6081 * [`Ordering::then_with`]
6082 * [`BTreeMap::range`]
6083 * [`BTreeMap::range_mut`]
6084 * [`collections::Bound`]
6085 * [`process::abort`]
6086 * [`ptr::read_unaligned`]
6087 * [`ptr::write_unaligned`]
6088 * [`Result::expect_err`]
6091 * [`Cell::into_inner`]
6097 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6098 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6099 * [`String` implements `FromIterator<&char>`][40028]
6100 * `Box` [implements][40009] a number of new conversions:
6101 `From<Box<str>> for String`,
6102 `From<Box<[T]>> for Vec<T>`,
6103 `From<Box<CStr>> for CString`,
6104 `From<Box<OsStr>> for OsString`,
6105 `From<Box<Path>> for PathBuf`,
6106 `Into<Box<str>> for String`,
6107 `Into<Box<[T]>> for Vec<T>`,
6108 `Into<Box<CStr>> for CString`,
6109 `Into<Box<OsStr>> for OsString`,
6110 `Into<Box<Path>> for PathBuf`,
6111 `Default for Box<str>`,
6112 `Default for Box<CStr>`,
6113 `Default for Box<OsStr>`,
6114 `From<&CStr> for Box<CStr>`,
6115 `From<&OsStr> for Box<OsStr>`,
6116 `From<&Path> for Box<Path>`
6117 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6118 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6119 * [Slightly optimize `slice::sort`][39538]
6120 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6121 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6122 `Box<str>` implements `From<&str>`][39438]
6123 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6124 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6125 * [`format!` estimates the needed capacity before writing a string][39356]
6126 * [Support unprivileged symlink creation in Windows][38921]
6127 * [`PathBuf` implements `Default`][38764]
6128 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6129 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6130 and poor hash functions.
6135 * [Add `cargo check --all`][cargo/3731]
6136 * [Add an option to ignore SSL revocation checking][cargo/3699]
6137 * [Add `cargo run --package`][cargo/3691]
6138 * [Add `required_features`][cargo/3667]
6139 * [Assume `build.rs` is a build script][cargo/3664]
6140 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6145 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6147 * [The "Unstable Book" documents nightly-only features][ubook]
6148 * [Improve the style of the sidebar in rustdoc output][40265]
6149 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6150 * [Fix MSP430 breakage due to `i128`][40257]
6151 * [Preliminary Solaris/SPARCv9 support][39903]
6152 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6153 run without installing the MSVC runtime.
6154 * [`rustdoc --test` includes file names in test names][39788]
6155 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6156 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6157 * [Initial support for `aarch64-unknown-freebsd`][39491]
6158 * [Initial support for `i686-unknown-netbsd`][39426]
6159 * [This release no longer includes the old makefile build system][39431]. Rust
6160 is built with a custom build system, written in Rust, and with Cargo.
6161 * [Add Debug implementations for libcollection structs][39002]
6162 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6163 * [`--test-threads=0` produces an error][38945]
6164 * [`rustup` installs documentation by default][40526]
6165 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6166 WinDbg and Visual Studio to improve the debugging experience.
6171 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6172 workaround, either use MSVC 2015 or run vcvars.bat.
6173 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6174 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6175 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6177 * [`format!` and `Display::to_string` panic if an underlying formatting
6178 implementation returns an error][40117]. Previously the error was silently
6179 ignored. It is incorrect for `write_fmt` to return an error when writing
6181 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6182 crates were marked stable and could be accessed from the stable toolchain.
6183 * [Rust git source no longer includes vendored crates][39728]. Those that need
6184 to build with vendored crates should build from release tarballs.
6185 * [Fix inert attributes from `proc_macro_derives`][39572]
6186 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6187 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6189 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6190 existing code generally ignores the type of dead-code unless a type-hint is
6191 provided; this can cause surprising inference interactions particularly around
6192 defaulting. The new code uniformly ignores the result type of dead-code.
6193 * [Tuple-struct constructors with private fields are no longer visible][38932]
6194 * [Lifetime parameters that do not appear in the arguments are now considered
6195 early-bound][38897], resolving a soundness bug (#[32330]). The
6196 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6198 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6199 * [Make transmuting from fn item types to pointer-sized types a hard
6202 [27787]: https://github.com/rust-lang/rust/issues/27787
6203 [32330]: https://github.com/rust-lang/rust/issues/32330
6204 [34198]: https://github.com/rust-lang/rust/pull/34198
6205 [38161]: https://github.com/rust-lang/rust/pull/38161
6206 [38368]: https://github.com/rust-lang/rust/pull/38368
6207 [38584]: https://github.com/rust-lang/rust/issues/38584
6208 [38661]: https://github.com/rust-lang/rust/pull/38661
6209 [38764]: https://github.com/rust-lang/rust/pull/38764
6210 [38864]: https://github.com/rust-lang/rust/issues/38864
6211 [38897]: https://github.com/rust-lang/rust/pull/38897
6212 [38921]: https://github.com/rust-lang/rust/pull/38921
6213 [38932]: https://github.com/rust-lang/rust/pull/38932
6214 [38945]: https://github.com/rust-lang/rust/pull/38945
6215 [38981]: https://github.com/rust-lang/rust/pull/38981
6216 [39002]: https://github.com/rust-lang/rust/pull/39002
6217 [39116]: https://github.com/rust-lang/rust/pull/39116
6218 [39193]: https://github.com/rust-lang/rust/pull/39193
6219 [39265]: https://github.com/rust-lang/rust/pull/39265
6220 [39356]: https://github.com/rust-lang/rust/pull/39356
6221 [39372]: https://github.com/rust-lang/rust/pull/39372
6222 [39426]: https://github.com/rust-lang/rust/pull/39426
6223 [39431]: https://github.com/rust-lang/rust/pull/39431
6224 [39438]: https://github.com/rust-lang/rust/pull/39438
6225 [39440]: https://github.com/rust-lang/rust/pull/39440
6226 [39485]: https://github.com/rust-lang/rust/pull/39485
6227 [39491]: https://github.com/rust-lang/rust/pull/39491
6228 [39518]: https://github.com/rust-lang/rust/pull/39518
6229 [39538]: https://github.com/rust-lang/rust/pull/39538
6230 [39572]: https://github.com/rust-lang/rust/pull/39572
6231 [39633]: https://github.com/rust-lang/rust/pull/39633
6232 [39642]: https://github.com/rust-lang/rust/pull/39642
6233 [39728]: https://github.com/rust-lang/rust/pull/39728
6234 [39761]: https://github.com/rust-lang/rust/pull/39761
6235 [39788]: https://github.com/rust-lang/rust/pull/39788
6236 [39793]: https://github.com/rust-lang/rust/pull/39793
6237 [39837]: https://github.com/rust-lang/rust/pull/39837
6238 [39843]: https://github.com/rust-lang/rust/pull/39843
6239 [39851]: https://github.com/rust-lang/rust/pull/39851
6240 [39903]: https://github.com/rust-lang/rust/pull/39903
6241 [39939]: https://github.com/rust-lang/rust/pull/39939
6242 [39953]: https://github.com/rust-lang/rust/pull/39953
6243 [39960]: https://github.com/rust-lang/rust/pull/39960
6244 [39990]: https://github.com/rust-lang/rust/pull/39990
6245 [39995]: https://github.com/rust-lang/rust/pull/39995
6246 [40008]: https://github.com/rust-lang/rust/pull/40008
6247 [40009]: https://github.com/rust-lang/rust/pull/40009
6248 [40027]: https://github.com/rust-lang/rust/pull/40027
6249 [40028]: https://github.com/rust-lang/rust/pull/40028
6250 [40037]: https://github.com/rust-lang/rust/pull/40037
6251 [40117]: https://github.com/rust-lang/rust/pull/40117
6252 [40166]: https://github.com/rust-lang/rust/pull/40166
6253 [40245]: https://github.com/rust-lang/rust/pull/40245
6254 [40257]: https://github.com/rust-lang/rust/pull/40257
6255 [40261]: https://github.com/rust-lang/rust/pull/40261
6256 [40265]: https://github.com/rust-lang/rust/pull/40265
6257 [40319]: https://github.com/rust-lang/rust/pull/40319
6258 [40336]: https://github.com/rust-lang/rust/pull/40336
6259 [40526]: https://github.com/rust-lang/rust/pull/40526
6260 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6261 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6262 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6263 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6264 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6265 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6266 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6267 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6268 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6269 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6270 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6271 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6272 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6273 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6274 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6275 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6276 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6277 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6278 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6279 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6280 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6281 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6282 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6283 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6284 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6285 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6286 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6287 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6288 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6289 [ubook]: https://doc.rust-lang.org/unstable-book/
6292 Version 1.16.0 (2017-03-16)
6293 ===========================
6298 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6299 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6300 match patterns][38069]
6301 * [Clean up semantics of `self` in an import list][38313]
6302 * [`Self` may appear in `impl` headers][38920]
6303 * [`Self` may appear in struct expressions][39282]
6308 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6309 a `.rmeta` file containing only crate metadata][38571]. This can be
6310 used by tools like the Rust Language Service to perform
6311 metadata-only builds.
6312 * [Levenshtein based typo suggestions now work in most places, while
6313 previously they worked only for fields and sometimes for local
6314 variables][38927]. Together with the overhaul of "no
6315 resolution"/"unexpected resolution" errors (#[38154]) they result in
6316 large and systematic improvement in resolution diagnostics.
6317 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6319 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6320 * [`rustc` no longer attempts to provide "consider using an explicit
6321 lifetime" suggestions][37057]. They were inaccurate.
6326 * [`VecDeque::truncate`]
6327 * [`VecDeque::resize`]
6328 * [`String::insert_str`]
6329 * [`Duration::checked_add`]
6330 * [`Duration::checked_sub`]
6331 * [`Duration::checked_div`]
6332 * [`Duration::checked_mul`]
6335 * [`SocketAddr::is_ipv4`]
6336 * [`SocketAddr::is_ipv6`]
6337 * [`IpAddr::is_ipv4`]
6338 * [`IpAddr::is_ipv6`]
6340 * [`Vec::dedup_by_key`]
6341 * [`Result::unwrap_or_default`]
6342 * [`<*const T>::wrapping_offset`]
6343 * [`<*mut T>::wrapping_offset`]
6344 * `CommandExt::creation_flags`
6345 * [`File::set_permissions`]
6346 * [`String::split_off`]
6351 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6352 their argument by `Borrow` parameter][37761]
6353 * [All public types in std implement `Debug`][38006]
6354 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6355 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6356 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6358 * [std: Fix partial writes in `LineWriter`][38062]
6359 * [std: Clamp max read/write sizes on Unix][38622]
6360 * [Use more specific panic message for `&str` slicing errors][38066]
6361 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6362 functionality cannot be achieved in std currently.
6363 * [`writeln!`, like `println!`, now accepts a form with no string
6364 or formatting arguments, to just print a newline][38469]
6365 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6366 * [Reduce the size of static data in `std_unicode::tables`][38781]
6367 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6368 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6370 * [`Duration` implements `Sum`][38712]
6371 * [`String` implements `ToSocketAddrs`][39048]
6376 * [The `cargo check` command does a type check of a project without
6377 building it][cargo/3296]
6378 * [crates.io will display CI badges from Travis and AppVeyor, if
6379 specified in Cargo.toml][cargo/3546]
6380 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6381 * [Compilation profiles accept integer values for `debug`, in addition
6382 to `true` and `false`. These are passed to `rustc` as the value to
6383 `-C debuginfo`][cargo/3534]
6384 * [Implement `cargo --version --verbose`][cargo/3604]
6385 * [All builds now output 'dep-info' build dependencies compatible with
6386 make and ninja][cargo/3557]
6387 * [Build all workspace members with `build --all`][cargo/3511]
6388 * [Document all workspace members with `doc --all`][cargo/3515]
6389 * [Path deps outside workspace are not members][cargo/3443]
6394 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6395 the path to the Rust implementation][38589]
6396 * [The `armv7-linux-androideabi` target no longer enables NEON
6397 extensions, per Google's ABI guide][38413]
6398 * [The stock standard library can be compiled for Redox OS][38401]
6399 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6401 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6403 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6408 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6409 match patterns][38069]
6410 * In this release, references to uninhabited types can not be
6411 pattern-matched. This was accidentally allowed in 1.15.
6412 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6413 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6415 * [Clean up semantics of `self` in an import list][38313]
6416 * Reimplemented lifetime elision. This change was almost entirely compatible
6417 with existing code, but it did close a number of small bugs and loopholes,
6418 as well as being more accepting in some other [cases][41105].
6420 [37057]: https://github.com/rust-lang/rust/pull/37057
6421 [37761]: https://github.com/rust-lang/rust/pull/37761
6422 [38006]: https://github.com/rust-lang/rust/pull/38006
6423 [38051]: https://github.com/rust-lang/rust/pull/38051
6424 [38062]: https://github.com/rust-lang/rust/pull/38062
6425 [38622]: https://github.com/rust-lang/rust/pull/38622
6426 [38066]: https://github.com/rust-lang/rust/pull/38066
6427 [38069]: https://github.com/rust-lang/rust/pull/38069
6428 [38131]: https://github.com/rust-lang/rust/pull/38131
6429 [38154]: https://github.com/rust-lang/rust/pull/38154
6430 [38274]: https://github.com/rust-lang/rust/pull/38274
6431 [38304]: https://github.com/rust-lang/rust/pull/38304
6432 [38313]: https://github.com/rust-lang/rust/pull/38313
6433 [38327]: https://github.com/rust-lang/rust/pull/38327
6434 [38401]: https://github.com/rust-lang/rust/pull/38401
6435 [38413]: https://github.com/rust-lang/rust/pull/38413
6436 [38469]: https://github.com/rust-lang/rust/pull/38469
6437 [38559]: https://github.com/rust-lang/rust/pull/38559
6438 [38571]: https://github.com/rust-lang/rust/pull/38571
6439 [38580]: https://github.com/rust-lang/rust/pull/38580
6440 [38589]: https://github.com/rust-lang/rust/pull/38589
6441 [38670]: https://github.com/rust-lang/rust/pull/38670
6442 [38712]: https://github.com/rust-lang/rust/pull/38712
6443 [38726]: https://github.com/rust-lang/rust/pull/38726
6444 [38781]: https://github.com/rust-lang/rust/pull/38781
6445 [38798]: https://github.com/rust-lang/rust/pull/38798
6446 [38909]: https://github.com/rust-lang/rust/pull/38909
6447 [38920]: https://github.com/rust-lang/rust/pull/38920
6448 [38927]: https://github.com/rust-lang/rust/pull/38927
6449 [39048]: https://github.com/rust-lang/rust/pull/39048
6450 [39282]: https://github.com/rust-lang/rust/pull/39282
6451 [39379]: https://github.com/rust-lang/rust/pull/39379
6452 [41105]: https://github.com/rust-lang/rust/issues/41105
6453 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6454 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6455 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6456 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6457 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6458 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6459 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6460 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6461 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6462 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6463 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6464 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6465 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6466 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6467 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6468 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6469 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6470 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6471 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6472 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6473 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6474 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6475 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6476 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6477 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6478 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6479 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6480 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6481 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6484 Version 1.15.1 (2017-02-09)
6485 ===========================
6487 * [Fix IntoIter::as_mut_slice's signature][39466]
6488 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6490 [39466]: https://github.com/rust-lang/rust/pull/39466
6491 [39523]: https://github.com/rust-lang/rust/pull/39523
6494 Version 1.15.0 (2017-02-02)
6495 ===========================
6500 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6501 stable. This allows popular code-generating crates like Serde and Diesel to
6502 work ergonomically. [RFC 1681].
6503 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6504 with curly braces][36868]. Part of [RFC 1506].
6505 * [A number of minor changes to name resolution have been activated][37127].
6506 They add up to more consistent semantics, allowing for future evolution of
6507 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6508 details of what is different. The breaking changes here have been transitioned
6509 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6510 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6512 * [`?Sized` can be used in `where` clauses][37791]
6513 * [There is now a limit on the size of monomorphized types and it can be
6514 modified with the `#![type_size_limit]` crate attribute, similarly to
6515 the `#![recursion_limit]` attribute][37789]
6520 * [On Windows, the compiler will apply dllimport attributes when linking to
6521 extern functions][37973]. Additional attributes and flags can control which
6522 library kind is linked and its name. [RFC 1717].
6523 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6524 * [The `--test` flag works with procedural macro crates][38107]
6525 * [Fix `extern "aapcs" fn` ABI][37814]
6526 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6527 * [The `format!` expander recognizes incorrect `printf` and shell-style
6528 formatting directives and suggests the correct format][37613].
6529 * [Only report one error for all unused imports in an import list][37456]
6531 Compiler Performance
6532 --------------------
6534 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6535 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6536 * [Don't clone in `UnificationTable::probe`][37848]
6537 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6538 * [Use small vectors in type walker][37760]
6539 * [Macro expansion performance was improved][37701]
6540 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6541 * [Replace FNV with a faster hash function][37229]
6546 * [`std::iter::Iterator::min_by`]
6547 * [`std::iter::Iterator::max_by`]
6548 * [`std::os::*::fs::FileExt`]
6549 * [`std::sync::atomic::Atomic*::get_mut`]
6550 * [`std::sync::atomic::Atomic*::into_inner`]
6551 * [`std::vec::IntoIter::as_slice`]
6552 * [`std::vec::IntoIter::as_mut_slice`]
6553 * [`std::sync::mpsc::Receiver::try_iter`]
6554 * [`std::os::unix::process::CommandExt::before_exec`]
6555 * [`std::rc::Rc::strong_count`]
6556 * [`std::rc::Rc::weak_count`]
6557 * [`std::sync::Arc::strong_count`]
6558 * [`std::sync::Arc::weak_count`]
6559 * [`std::char::encode_utf8`]
6560 * [`std::char::encode_utf16`]
6561 * [`std::cell::Ref::clone`]
6562 * [`std::io::Take::into_inner`]
6567 * [The standard sorting algorithm has been rewritten for dramatic performance
6568 improvements][38192]. It is a hybrid merge sort, drawing influences from
6569 Timsort. Previously it was a naive merge sort.
6570 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6571 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6573 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6574 and `char_indices().last()`][37882]
6575 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6576 * [Chinese characters display correctly in `fmt::Debug`][37855]
6577 * [Derive `Default` for `Duration`][37699]
6578 * [Support creation of anonymous pipes on WinXP/2k][37677]
6579 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6580 * [Don't pass overlapped handles to processes][38835]
6585 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6586 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6587 should instead check the variable at runtime with `std::env`. That the value
6588 was set at build time was a bug, and incorrect when cross-compiling. This
6589 change is known to cause breakage.
6590 * [Add `--all` flag to `cargo test`][cargo/3221]
6591 * [Compile statically against the MSVC CRT][cargo/3363]
6592 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6593 * [Link OpenSSL statically on OSX][cargo/3311]
6594 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6595 * [Test for bad path overrides with summaries][cargo/3336]
6596 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6597 * [Fix retrying crate downloads for network errors][cargo/3348]
6598 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6599 * [Emit more info on --message-format=json][cargo/3319]
6600 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6601 * [Don't ignore errors in workspace manifest][cargo/3409]
6602 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6607 * [Test runners (binaries built with `--test`) now support a `--list` argument
6608 that lists the tests it contains][38185]
6609 * [Test runners now support a `--exact` argument that makes the test filter
6610 match exactly, instead of matching only a substring of the test name][38181]
6611 * [rustdoc supports a `--playground-url` flag][37763]
6612 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6617 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6618 continue to be used in this release by passing `--disable-rustbuild` to the
6619 configure script, but they will be deleted soon. Note that the new build
6620 system uses a different on-disk layout that will likely affect any scripts
6622 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6624 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6625 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6631 * [A number of minor changes to name resolution have been activated][37127].
6632 They add up to more consistent semantics, allowing for future evolution of
6633 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6634 details of what is different. The breaking changes here have been transitioned
6635 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6636 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6637 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6638 should instead check the variable at runtime with `std::env`. That the value
6639 was set at build time was a bug, and incorrect when cross-compiling. This
6640 change is known to cause breakage.
6641 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6642 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6643 1.10 and is now an error by default. It will become a hard error in the near
6645 * [The semantics relating modules to file system directories are changing in
6646 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6647 lint, which is a warning in this release, and will become a hard error in the
6649 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6650 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6651 the underlying iterator][37834]
6653 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6654 [33685]: https://github.com/rust-lang/rust/issues/33685
6655 [36868]: https://github.com/rust-lang/rust/pull/36868
6656 [37127]: https://github.com/rust-lang/rust/pull/37127
6657 [37229]: https://github.com/rust-lang/rust/pull/37229
6658 [37456]: https://github.com/rust-lang/rust/pull/37456
6659 [37527]: https://github.com/rust-lang/rust/pull/37527
6660 [37602]: https://github.com/rust-lang/rust/pull/37602
6661 [37613]: https://github.com/rust-lang/rust/pull/37613
6662 [37615]: https://github.com/rust-lang/rust/pull/37615
6663 [37636]: https://github.com/rust-lang/rust/pull/37636
6664 [37627]: https://github.com/rust-lang/rust/pull/37627
6665 [37642]: https://github.com/rust-lang/rust/pull/37642
6666 [37677]: https://github.com/rust-lang/rust/pull/37677
6667 [37699]: https://github.com/rust-lang/rust/pull/37699
6668 [37701]: https://github.com/rust-lang/rust/pull/37701
6669 [37705]: https://github.com/rust-lang/rust/pull/37705
6670 [37749]: https://github.com/rust-lang/rust/pull/37749
6671 [37760]: https://github.com/rust-lang/rust/pull/37760
6672 [37763]: https://github.com/rust-lang/rust/pull/37763
6673 [37764]: https://github.com/rust-lang/rust/pull/37764
6674 [37789]: https://github.com/rust-lang/rust/pull/37789
6675 [37791]: https://github.com/rust-lang/rust/pull/37791
6676 [37814]: https://github.com/rust-lang/rust/pull/37814
6677 [37817]: https://github.com/rust-lang/rust/pull/37817
6678 [37834]: https://github.com/rust-lang/rust/pull/37834
6679 [37848]: https://github.com/rust-lang/rust/pull/37848
6680 [37855]: https://github.com/rust-lang/rust/pull/37855
6681 [37882]: https://github.com/rust-lang/rust/pull/37882
6682 [37888]: https://github.com/rust-lang/rust/pull/37888
6683 [37973]: https://github.com/rust-lang/rust/pull/37973
6684 [37979]: https://github.com/rust-lang/rust/pull/37979
6685 [38086]: https://github.com/rust-lang/rust/pull/38086
6686 [38107]: https://github.com/rust-lang/rust/pull/38107
6687 [38117]: https://github.com/rust-lang/rust/pull/38117
6688 [38134]: https://github.com/rust-lang/rust/pull/38134
6689 [38146]: https://github.com/rust-lang/rust/pull/38146
6690 [38181]: https://github.com/rust-lang/rust/pull/38181
6691 [38182]: https://github.com/rust-lang/rust/pull/38182
6692 [38185]: https://github.com/rust-lang/rust/pull/38185
6693 [38192]: https://github.com/rust-lang/rust/pull/38192
6694 [38279]: https://github.com/rust-lang/rust/pull/38279
6695 [38835]: https://github.com/rust-lang/rust/pull/38835
6696 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6697 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6698 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6699 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6700 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6701 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6702 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6703 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6704 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6705 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6706 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6707 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6708 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6709 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6710 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6711 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6712 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6713 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6714 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6715 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6716 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6717 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6718 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6719 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6720 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6721 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6722 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6723 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6724 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6725 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6726 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6727 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6728 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6729 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6730 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6731 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6732 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6735 Version 1.14.0 (2016-12-22)
6736 ===========================
6741 * [`..` matches multiple tuple fields in enum variants, structs
6742 and tuples][36843]. [RFC 1492].
6743 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6744 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6745 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6746 dereferencing][36822]
6751 * [Mark enums with non-zero discriminant as non-zero][37224]
6752 * [Lower-case `static mut` names are linted like other
6753 statics and consts][37162]
6754 * [Fix ICE on some macros in const integer positions
6755 (e.g. `[u8; m!()]`)][36819]
6756 * [Improve error message and snippet for "did you mean `x`"][36798]
6757 * [Add a panic-strategy field to the target specification][36794]
6758 * [Include LLVM version in `--version --verbose`][37200]
6760 Compile-time Optimizations
6761 --------------------------
6763 * [Improve macro expansion performance][37569]
6764 * [Shrink `Expr_::ExprInlineAsm`][37445]
6765 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6766 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6767 * [Avoid more allocations when compiling html5ever][37373]
6768 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6769 * [Avoid some allocations in the macro parser][37318]
6770 * [Use a faster deflate setting][37298]
6771 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6772 during interning of slices][37270]
6773 * [Optimize `write_metadata`][37267]
6774 * [Don't process obligation forest cycles when stalled][37231]
6775 * [Avoid many `CrateConfig` clones][37161]
6776 * [Optimize `Substs::super_fold_with`][37108]
6777 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6778 * [Speed up `plug_leaks`][36917]
6783 * [`println!()`, with no arguments, prints newline][36825].
6784 Previously, an empty string was required to achieve the same.
6785 * [`Wrapping` impls standard binary and unary operators, as well as
6786 the `Sum` and `Product` iterators][37356]
6787 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6789 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6790 `VecDeque` iterators][37315]
6791 * [Improve `SipHasher` performance on small values][37312]
6792 * [Add Iterator trait TrustedLen to enable better FromIterator /
6794 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6795 * [`ReadDir` implements `Debug`][37221]
6796 * [Implement `RefUnwindSafe` for atomic types][37178]
6797 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6798 * [Avoid allocations in `Decoder::read_str`][37064]
6799 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6800 * [Impl `Debug` for raw pointers to unsized data][36880]
6801 * [Don't reuse `HashMap` random seeds][37470]
6802 * [The internal memory layout of `HashMap` is more cache-friendly, for
6803 significant improvements in some operations][36692]
6804 * [`HashMap` uses less memory on 32-bit architectures][36595]
6805 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6810 * [Expose rustc cfg values to build scripts][cargo/3243]
6811 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6812 * [Fix passing --features when testing multiple packages][cargo/3280]
6813 * [Use a single profile set per workspace][cargo/3249]
6814 * [Load `replace` sections from lock files][cargo/3220]
6815 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6820 * [rustup is the recommended Rust installation method][1.14rustup]
6821 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6822 S390x. These are [tier 2] platforms and may have major defects. Follow the
6823 instructions on the website to install, or add the targets to an existing
6824 installation with `rustup target add`. The new target triples are:
6825 - `mips-unknown-linux-gnu`
6826 - `mipsel-unknown-linux-gnu`
6827 - `mips64-unknown-linux-gnuabi64`
6828 - `mips64el-unknown-linux-gnuabi64 `
6829 - `powerpc-unknown-linux-gnu`
6830 - `powerpc64-unknown-linux-gnu`
6831 - `powerpc64le-unknown-linux-gnu`
6832 - `s390x-unknown-linux-gnu `
6833 * This release includes target (std) builds for ARM Linux running MUSL
6834 libc. These are [tier 2] platforms and may have major defects. Add the
6835 following triples to an existing rustup installation with `rustup target add`:
6836 - `arm-unknown-linux-musleabi`
6837 - `arm-unknown-linux-musleabihf`
6838 - `armv7-unknown-linux-musleabihf`
6839 * This release includes [experimental support for WebAssembly][1.14wasm], via
6840 the `wasm32-unknown-emscripten` target. This target is known to have major
6841 defects. Please test, report, and fix.
6842 * rustup no longer installs documentation by default. Run `rustup
6843 component add rust-docs` to install.
6844 * [Fix line stepping in debugger][37310]
6845 * [Enable line number debuginfo in releases][37280]
6850 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6851 * [Add support for Fuchsia OS][37313]
6852 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6857 * [A number of forward-compatibility lints used by the compiler
6858 to gradually introduce language changes have been converted
6859 to deny by default][36894]:
6860 - ["use of inaccessible extern crate erroneously allowed"][36886]
6861 - ["type parameter default erroneously allowed in invalid location"][36887]
6862 - ["detects super or self keywords at the beginning of global path"][36888]
6863 - ["two overlapping inherent impls define an item with the same name
6864 were erroneously allowed"][36889]
6865 - ["floating-point constants cannot be used in patterns"][36890]
6866 - ["constants of struct or enum type can only be used in a pattern if
6867 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6868 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6869 * [Prohibit patterns in trait methods without bodies][37378]
6870 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6871 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6872 * [The `$crate` macro variable is accepted in fewer locations][37213]
6873 * [Impls specifying extra region requirements beyond the trait
6874 they implement are rejected][37167]
6875 * [Enums may not be unsized][37111]. Unsized enums are intended to
6876 work but never have. For now they are forbidden.
6877 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6879 [tier 2]: https://forge.rust-lang.org/platform-support.html
6880 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6881 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6882 [36430]: https://github.com/rust-lang/rust/pull/36430
6883 [36595]: https://github.com/rust-lang/rust/pull/36595
6884 [36692]: https://github.com/rust-lang/rust/pull/36692
6885 [36767]: https://github.com/rust-lang/rust/pull/36767
6886 [36794]: https://github.com/rust-lang/rust/pull/36794
6887 [36798]: https://github.com/rust-lang/rust/pull/36798
6888 [36819]: https://github.com/rust-lang/rust/pull/36819
6889 [36822]: https://github.com/rust-lang/rust/pull/36822
6890 [36825]: https://github.com/rust-lang/rust/pull/36825
6891 [36843]: https://github.com/rust-lang/rust/pull/36843
6892 [36880]: https://github.com/rust-lang/rust/pull/36880
6893 [36886]: https://github.com/rust-lang/rust/issues/36886
6894 [36887]: https://github.com/rust-lang/rust/issues/36887
6895 [36888]: https://github.com/rust-lang/rust/issues/36888
6896 [36889]: https://github.com/rust-lang/rust/issues/36889
6897 [36890]: https://github.com/rust-lang/rust/issues/36890
6898 [36891]: https://github.com/rust-lang/rust/issues/36891
6899 [36892]: https://github.com/rust-lang/rust/issues/36892
6900 [36894]: https://github.com/rust-lang/rust/pull/36894
6901 [36917]: https://github.com/rust-lang/rust/pull/36917
6902 [36993]: https://github.com/rust-lang/rust/pull/36993
6903 [37037]: https://github.com/rust-lang/rust/pull/37037
6904 [37064]: https://github.com/rust-lang/rust/pull/37064
6905 [37094]: https://github.com/rust-lang/rust/pull/37094
6906 [37108]: https://github.com/rust-lang/rust/pull/37108
6907 [37111]: https://github.com/rust-lang/rust/pull/37111
6908 [37161]: https://github.com/rust-lang/rust/pull/37161
6909 [37162]: https://github.com/rust-lang/rust/pull/37162
6910 [37167]: https://github.com/rust-lang/rust/pull/37167
6911 [37178]: https://github.com/rust-lang/rust/pull/37178
6912 [37200]: https://github.com/rust-lang/rust/pull/37200
6913 [37213]: https://github.com/rust-lang/rust/pull/37213
6914 [37221]: https://github.com/rust-lang/rust/pull/37221
6915 [37224]: https://github.com/rust-lang/rust/pull/37224
6916 [37230]: https://github.com/rust-lang/rust/pull/37230
6917 [37231]: https://github.com/rust-lang/rust/pull/37231
6918 [37247]: https://github.com/rust-lang/rust/pull/37247
6919 [37267]: https://github.com/rust-lang/rust/pull/37267
6920 [37270]: https://github.com/rust-lang/rust/pull/37270
6921 [37273]: https://github.com/rust-lang/rust/pull/37273
6922 [37280]: https://github.com/rust-lang/rust/pull/37280
6923 [37298]: https://github.com/rust-lang/rust/pull/37298
6924 [37306]: https://github.com/rust-lang/rust/pull/37306
6925 [37310]: https://github.com/rust-lang/rust/pull/37310
6926 [37312]: https://github.com/rust-lang/rust/pull/37312
6927 [37313]: https://github.com/rust-lang/rust/pull/37313
6928 [37315]: https://github.com/rust-lang/rust/pull/37315
6929 [37318]: https://github.com/rust-lang/rust/pull/37318
6930 [37322]: https://github.com/rust-lang/rust/pull/37322
6931 [37326]: https://github.com/rust-lang/rust/pull/37326
6932 [37351]: https://github.com/rust-lang/rust/pull/37351
6933 [37356]: https://github.com/rust-lang/rust/pull/37356
6934 [37367]: https://github.com/rust-lang/rust/pull/37367
6935 [37373]: https://github.com/rust-lang/rust/pull/37373
6936 [37378]: https://github.com/rust-lang/rust/pull/37378
6937 [37389]: https://github.com/rust-lang/rust/pull/37389
6938 [37392]: https://github.com/rust-lang/rust/pull/37392
6939 [37427]: https://github.com/rust-lang/rust/pull/37427
6940 [37439]: https://github.com/rust-lang/rust/pull/37439
6941 [37445]: https://github.com/rust-lang/rust/pull/37445
6942 [37470]: https://github.com/rust-lang/rust/pull/37470
6943 [37569]: https://github.com/rust-lang/rust/pull/37569
6944 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6945 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6946 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6947 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6948 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6949 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6950 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6953 Version 1.13.0 (2016-11-10)
6954 ===========================
6959 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6960 errors, like the `try!` macro, described in [RFC 0243].
6961 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6962 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6963 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6964 * [Fix lifetime rules for 'if' conditions][36029]
6965 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6970 * [Add the `-C link-arg` argument][36574]
6971 * [Remove the old AST-based backend from rustc_trans][35764]
6972 * [Don't enable NEON by default on armv7 Linux][35814]
6973 * [Fix debug line number info for macro expansions][35238]
6974 * [Do not emit "class method" debuginfo for types that are not
6975 DICompositeType][36008]
6976 * [Warn about multiple conflicting #[repr] hints][34623]
6977 * [When sizing DST, don't double-count nested struct prefixes][36351]
6978 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6979 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6980 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6981 * [Expand macros without recursing to avoid stack overflows][36214]
6986 * [Replace macro backtraces with labeled local uses][35702]
6987 * [Improve error message for misplaced doc comments][33922]
6988 * [Buffer unix and lock windows to prevent message interleaving][35975]
6989 * [Update lifetime errors to specifically note temporaries][36171]
6990 * [Special case a few colors for Windows][36178]
6991 * [Suggest `use self` when such an import resolves][36289]
6992 * [Be more specific when type parameter shadows primitive type][36338]
6993 * Many minor improvements
6995 Compile-time Optimizations
6996 --------------------------
6998 * [Compute and cache HIR hashes at beginning][35854]
6999 * [Don't hash types in loan paths][36004]
7000 * [Cache projections in trans][35761]
7001 * [Optimize the parser's last token handling][36527]
7002 * [Only instantiate #[inline] functions in codegen units referencing
7003 them][36524]. This leads to big improvements in cases where crates export
7004 define many inline functions without using them directly.
7005 * [Lazily allocate TypedArena's first chunk][36592]
7006 * [Don't allocate during default HashSet creation][36734]
7013 * [`overflowing_abs`]
7014 * [`RefCell::try_borrow`]
7015 * [`RefCell::try_borrow_mut`]
7020 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7021 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7023 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7024 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7025 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7026 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7027 * [Use arc4rand on FreeBSD][35884]
7028 * [memrchr: Correct aligned offset computation][35969]
7029 * [Improve Demangling of Rust Symbols][36059]
7030 * [Use monotonic time in condition variables][35048]
7031 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7032 * [Implement conversion traits for `char`][35755]
7033 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7034 * [Zero first byte of CString on drop][36264]
7035 * [Inherit overflow checks for sum and product][36372]
7036 * [Add missing Eq implementations][36423]
7037 * [Implement `Debug` for `DirEntry`][36631]
7038 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7040 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7041 * [Implement more traits for `std::io::ErrorKind`][35911]
7042 * [Optimize BinaryHeap bounds checking][36072]
7043 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7044 `extend_with_element`][36355]
7045 * [Fix overflow checking in unsigned pow()][34942]
7050 * This release includes security fixes to both curl and OpenSSL.
7051 * [Fix transitive doctests when panic=abort][cargo/3021]
7052 * [Add --all-features flag to cargo][cargo/3038]
7053 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7054 * [Don't parse the home directory more than once][cargo/3078]
7055 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7056 * [Update OpenSSL to 1.0.2j][cargo/3121]
7057 * [Add license and license_file to cargo metadata output][cargo/3110]
7058 * [Make crates-io registry URL optional in config; ignore all changes to
7059 source.crates-io][cargo/3089]
7060 * [Don't download dependencies from other platforms][cargo/3123]
7061 * [Build transitive dev-dependencies when needed][cargo/3125]
7062 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7063 * [Avoid updating registry when adding existing deps][cargo/3144]
7064 * [Warn about path overrides that won't work][cargo/3136]
7065 * [Use workspaces during `cargo install`][cargo/3146]
7066 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7067 * [Add --message-format flag][cargo/3000]
7068 * [Pass target environment for rustdoc][cargo/3205]
7069 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7070 * [Update curl and curl-sys][cargo/3241]
7071 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7076 * [rustdoc: Add the `--sysroot` argument][36586]
7077 * [rustdoc: Fix a couple of issues with the search results][35655]
7078 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7079 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7080 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7085 * [Remove unmaintained style guide][35124]
7086 * [Add s390x support][36369]
7087 * [Initial work at Haiku OS support][36727]
7088 * [Add mips-uclibc targets][35734]
7089 * [Crate-ify compiler-rt into compiler-builtins][35021]
7090 * [Add rustc version info (git hash + date) to dist tarball][36213]
7091 * Many documentation improvements
7096 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7097 * [Deny (by default) transmuting from fn item types to pointer-sized
7098 types][34923]. Continuing the long transition to zero-sized fn items,
7100 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7102 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7103 * [Fix lifetime rules for 'if' conditions][36029].
7104 * [Inherit overflow checks for sum and product][36372].
7105 * [Forbid user-defined macros named "macro_rules"][36730].
7107 [33922]: https://github.com/rust-lang/rust/pull/33922
7108 [34623]: https://github.com/rust-lang/rust/pull/34623
7109 [34923]: https://github.com/rust-lang/rust/pull/34923
7110 [34942]: https://github.com/rust-lang/rust/pull/34942
7111 [35021]: https://github.com/rust-lang/rust/pull/35021
7112 [35048]: https://github.com/rust-lang/rust/pull/35048
7113 [35074]: https://github.com/rust-lang/rust/pull/35074
7114 [35124]: https://github.com/rust-lang/rust/pull/35124
7115 [35234]: https://github.com/rust-lang/rust/pull/35234
7116 [35238]: https://github.com/rust-lang/rust/pull/35238
7117 [35354]: https://github.com/rust-lang/rust/pull/35354
7118 [35559]: https://github.com/rust-lang/rust/pull/35559
7119 [35585]: https://github.com/rust-lang/rust/pull/35585
7120 [35627]: https://github.com/rust-lang/rust/pull/35627
7121 [35655]: https://github.com/rust-lang/rust/pull/35655
7122 [35702]: https://github.com/rust-lang/rust/pull/35702
7123 [35707]: https://github.com/rust-lang/rust/pull/35707
7124 [35728]: https://github.com/rust-lang/rust/pull/35728
7125 [35734]: https://github.com/rust-lang/rust/pull/35734
7126 [35755]: https://github.com/rust-lang/rust/pull/35755
7127 [35761]: https://github.com/rust-lang/rust/pull/35761
7128 [35764]: https://github.com/rust-lang/rust/pull/35764
7129 [35814]: https://github.com/rust-lang/rust/pull/35814
7130 [35854]: https://github.com/rust-lang/rust/pull/35854
7131 [35871]: https://github.com/rust-lang/rust/pull/35871
7132 [35884]: https://github.com/rust-lang/rust/pull/35884
7133 [35911]: https://github.com/rust-lang/rust/pull/35911
7134 [35969]: https://github.com/rust-lang/rust/pull/35969
7135 [35975]: https://github.com/rust-lang/rust/pull/35975
7136 [36004]: https://github.com/rust-lang/rust/pull/36004
7137 [36008]: https://github.com/rust-lang/rust/pull/36008
7138 [36014]: https://github.com/rust-lang/rust/pull/36014
7139 [36029]: https://github.com/rust-lang/rust/pull/36029
7140 [36059]: https://github.com/rust-lang/rust/pull/36059
7141 [36072]: https://github.com/rust-lang/rust/pull/36072
7142 [36101]: https://github.com/rust-lang/rust/pull/36101
7143 [36104]: https://github.com/rust-lang/rust/pull/36104
7144 [36171]: https://github.com/rust-lang/rust/pull/36171
7145 [36173]: https://github.com/rust-lang/rust/pull/36173
7146 [36178]: https://github.com/rust-lang/rust/pull/36178
7147 [36213]: https://github.com/rust-lang/rust/pull/36213
7148 [36214]: https://github.com/rust-lang/rust/pull/36214
7149 [36264]: https://github.com/rust-lang/rust/pull/36264
7150 [36266]: https://github.com/rust-lang/rust/pull/36266
7151 [36289]: https://github.com/rust-lang/rust/pull/36289
7152 [36338]: https://github.com/rust-lang/rust/pull/36338
7153 [36351]: https://github.com/rust-lang/rust/pull/36351
7154 [36355]: https://github.com/rust-lang/rust/pull/36355
7155 [36369]: https://github.com/rust-lang/rust/pull/36369
7156 [36372]: https://github.com/rust-lang/rust/pull/36372
7157 [36423]: https://github.com/rust-lang/rust/pull/36423
7158 [36482]: https://github.com/rust-lang/rust/pull/36482
7159 [36505]: https://github.com/rust-lang/rust/pull/36505
7160 [36524]: https://github.com/rust-lang/rust/pull/36524
7161 [36527]: https://github.com/rust-lang/rust/pull/36527
7162 [36551]: https://github.com/rust-lang/rust/pull/36551
7163 [36574]: https://github.com/rust-lang/rust/pull/36574
7164 [36586]: https://github.com/rust-lang/rust/pull/36586
7165 [36592]: https://github.com/rust-lang/rust/pull/36592
7166 [36631]: https://github.com/rust-lang/rust/pull/36631
7167 [36721]: https://github.com/rust-lang/rust/pull/36721
7168 [36727]: https://github.com/rust-lang/rust/pull/36727
7169 [36730]: https://github.com/rust-lang/rust/pull/36730
7170 [36734]: https://github.com/rust-lang/rust/pull/36734
7171 [36754]: https://github.com/rust-lang/rust/pull/36754
7172 [36995]: https://github.com/rust-lang/rust/pull/36995
7173 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7174 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7175 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7176 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7177 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7178 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7179 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7180 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7181 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7182 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7183 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7184 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7185 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7186 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7187 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7188 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7189 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7190 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7191 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7192 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7193 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7194 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7195 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7196 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7197 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7198 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7199 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7200 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7201 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7202 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7203 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7204 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7207 Version 1.12.1 (2016-10-20)
7208 ===========================
7213 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7214 * [Confusion with double negation and booleans][36856]
7215 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7216 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7217 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7218 * [Corrupted memory after updated to 1.12][36936]
7219 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7220 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7221 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7223 [36381]: https://github.com/rust-lang/rust/issues/36381
7224 [36856]: https://github.com/rust-lang/rust/issues/36856
7225 [36875]: https://github.com/rust-lang/rust/issues/36875
7226 [36924]: https://github.com/rust-lang/rust/issues/36924
7227 [36926]: https://github.com/rust-lang/rust/issues/36926
7228 [36936]: https://github.com/rust-lang/rust/issues/36936
7229 [37026]: https://github.com/rust-lang/rust/issues/37026
7230 [37112]: https://github.com/rust-lang/rust/issues/37112
7231 [37153]: https://github.com/rust-lang/rust/issues/37153
7234 Version 1.12.0 (2016-09-29)
7235 ===========================
7240 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7241 This translation pass is far simpler than the previous AST->LLVM pass, and
7242 creates opportunities to perform new optimizations directly on the MIR. It
7243 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7244 * [`rustc` presents a new, more readable error format, along with
7245 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7246 Most common editors supporting Rust have been updated to work with it. It was
7247 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7252 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7253 This translation pass is far simpler than the previous AST->LLVM pass, and
7254 creates opportunities to perform new optimizations directly on the MIR. It
7255 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7256 * [Print the Rust target name, not the LLVM target name, with
7257 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7258 * [The computation of `TypeId` is correct in some cases where it was previously
7259 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7260 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7261 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7262 `--print relocation-models`, and `--print code-models` print the available
7263 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7264 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7265 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7266 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7267 These targets produce statically-linked binaries. There are no binary release
7273 * [`rustc` presents a new, more readable error format, along with
7274 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7275 Most common editors supporting Rust have been updated to work with it. It was
7276 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7277 * [In error descriptions, references are now described in plain English,
7278 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7279 * [In error type descriptions, unknown numeric types are named `{integer}` or
7280 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7281 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7286 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7287 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7288 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7289 useful](https://github.com/rust-lang/rust/pull/34908)
7290 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7291 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7292 * [Semicolons are properly required as statement delimiters inside
7293 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7294 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7299 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7300 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7301 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7302 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7303 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7304 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7305 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7306 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7307 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7308 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7309 Both on Unix and Windows.
7310 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7311 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7312 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7313 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7314 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7315 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7316 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7317 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7322 * [The `format!` macro and friends now allow a single argument to be formatted
7323 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7324 * [The lifetime bounds on `[T]::binary_search_by` and
7325 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7326 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7327 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7328 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7329 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7330 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7331 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7332 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7333 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7334 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7335 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7336 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7337 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7338 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7339 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7340 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7341 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7342 * [`mpsc::sync_channel` `Receiver`s return any available message before
7343 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7344 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7345 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7350 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7351 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7352 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7353 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7354 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7355 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7356 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7357 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7358 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7359 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7360 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7361 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7362 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7363 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7364 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7365 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7370 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7371 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7376 * [Test binaries now support a `--test-threads` argument to specify the number
7377 of threads used to run tests, and which acts the same as the
7378 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7379 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7380 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7381 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7382 * [Rust releases now come with source packages that can be installed by rustup
7383 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7384 The resulting source code can be used by tools and IDES, located in the
7385 sysroot under `lib/rustlib/src`.
7390 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7391 * Many minor improvements to the documentation.
7392 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7397 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7398 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7399 * [When formatting strings, if "precision" is specified, the "fill",
7400 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7401 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7404 Version 1.11.0 (2016-08-18)
7405 ===========================
7410 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7411 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7412 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7413 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7418 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7419 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7420 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7421 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7422 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7423 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7424 (in libcore - previously stabilized in libstd)
7425 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7426 (in libcore - previously stabilized in libstd)
7427 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7428 (in libcore - previously stabilized in libstd)
7429 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7430 (in libcore - previously stabilized in libstd)
7431 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7432 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7433 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7434 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7439 * [The `thread_local!` macro supports multiple definitions in a single
7440 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7441 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7442 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7443 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7444 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7445 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7446 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7447 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7452 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7453 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7454 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7455 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7456 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7457 and `-vv` prints warnings for all crates.
7458 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7459 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7460 This provides room for expansion by arbitrary tools.
7461 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7462 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7463 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7464 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7465 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7466 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7467 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7472 * [Caching projections speeds up type check dramatically for some
7473 workloads](https://github.com/rust-lang/rust/pull/33816)
7474 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7475 This hasher is faster, but is believed to provide sufficient
7476 protection from collision attacks.
7477 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7482 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7483 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7484 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7485 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7486 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7491 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7492 * [When emitting debug info, rustc emits frame pointers for closures,
7493 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7494 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7495 * Many more errors have been given error codes and extended
7497 * API documentation continues to be improved, with many new examples
7502 * [rustc no longer hangs when dependencies recursively re-export
7503 submodules](https://github.com/rust-lang/rust/pull/34542)
7504 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7505 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7506 rewritten](https://github.com/rust-lang/rust/pull/33895)
7507 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7508 No targets use this yet, but it works toward AVR support.
7513 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7514 * [The new follow-set rules that place restrictions on `macro_rules!`
7515 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7516 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7517 and has been a warning since 1.10.
7518 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7519 This causes breakage in some corner cases.
7522 Version 1.10.0 (2016-07-07)
7523 ===========================
7528 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7529 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7530 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7531 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7532 * [`panic!` can be converted to a runtime abort with the
7533 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7534 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7535 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7536 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7537 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7538 Note that Cargo does not yet directly support cdylibs.
7543 * `os::windows::fs::OpenOptionsExt::access_mode`
7544 * `os::windows::fs::OpenOptionsExt::share_mode`
7545 * `os::windows::fs::OpenOptionsExt::custom_flags`
7546 * `os::windows::fs::OpenOptionsExt::attributes`
7547 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7548 * `os::unix::fs::OpenOptionsExt::custom_flags`
7549 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7550 * `Default for sync::Weak`
7551 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7552 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7553 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7554 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7555 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7556 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7557 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7558 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7559 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7560 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7561 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7562 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7563 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7564 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7565 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7566 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7567 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7568 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7569 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7570 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7571 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7572 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7573 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7574 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7575 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7576 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7577 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7578 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7579 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7580 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7581 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7582 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7583 * Read/Write/RawFd impls for `UnixStream`
7584 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7585 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7586 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7587 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7588 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7589 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7590 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7591 * RawFd impls for `UnixListener`
7592 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7593 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7594 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7595 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7596 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7597 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7598 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7599 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7600 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7601 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7602 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7603 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7604 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7605 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7606 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7607 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7608 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7609 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7610 * RawFd impls for `UnixDatagram`
7611 * `{BTree,Hash}Map::values_mut`
7612 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7617 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7618 The semantics of this minor method are subtle and probably not what
7620 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7621 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7622 will fall back to `/dev/urandom` temporarily to avoid blocking
7623 during early boot](https://github.com/rust-lang/rust/pull/33086).
7624 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7625 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7626 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7627 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7628 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7629 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7630 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7634 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7635 This controls the runtime behavior of the `panic!` macro
7636 and can be either "unwind" (the default), or "abort".
7637 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7638 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7639 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7640 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7641 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7642 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7643 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7644 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7645 By default they are retried twice, which can be customized with the
7646 `net.retry` value in `.cargo/config`.
7647 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7648 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7649 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7650 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7651 Makes it possible to install multiple crates in parallel.
7652 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7653 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7654 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7655 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7656 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7657 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7662 * [rustc memory usage was reduced by refactoring the context used for
7663 type checking](https://github.com/rust-lang/rust/pull/33425).
7664 * [Speed up creation of `HashMap`s by caching the random keys used
7665 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7666 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7667 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7668 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7669 10x faster than the previous lookup tables.
7670 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7675 * Many incremental improvements to documentation and rustdoc.
7676 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7677 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7678 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7679 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7680 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7681 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7682 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7687 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7688 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7689 * [`std` no longer prints backtraces on platforms where the running
7690 module must be loaded with `env::current_exe`, which can't be relied
7691 on](https://github.com/rust-lang/rust/pull/33554).
7692 * This release includes std binaries for the i586-unknown-linux-gnu,
7693 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7694 i586 target is for old x86 hardware without SSE2, and the armv7
7695 target is for Android running on modern ARM architectures.
7696 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7697 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7698 * [On Unix the runtime aborts by calling `libc::abort` instead of
7699 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7700 * [Rust is now bootstrapped from the previous release of Rust,
7701 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7706 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7707 * [`target_env` for Linux ARM targets is just `gnu`, not
7708 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7709 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7710 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7711 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7712 Affects how macros are parsed.
7713 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7714 * [Feature-gated attributes on macro-generated macro invocations are
7715 now rejected](https://github.com/rust-lang/rust/pull/32791).
7716 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7717 This caused some minor changes to type inference.
7720 Version 1.9.0 (2016-05-26)
7721 ==========================
7726 * The `#[deprecated]` attribute when applied to an API will generate
7727 warnings when used. The warnings may be suppressed with
7728 `#[allow(deprecated)]`. [RFC 1270].
7729 * [`fn` item types are zero sized, and each `fn` names a unique
7730 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7731 `transmute` on a `fn` type will generate a warning for a few cycles,
7732 then will be converted to an error.
7733 * [Field and method resolution understand visibility, so private
7734 fields and methods cannot prevent the proper use of public fields
7735 and methods][1.9fv].
7736 * [The parser considers unicode codepoints in the
7737 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7743 * [`std::panic::catch_unwind`] (renamed from `recover`)
7744 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7745 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7746 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7747 * [`str::is_char_boundary`]
7748 * [`<*const T>::as_ref`]
7749 * [`<*mut T>::as_ref`]
7750 * [`<*mut T>::as_mut`]
7751 * [`AsciiExt::make_ascii_uppercase`]
7752 * [`AsciiExt::make_ascii_lowercase`]
7753 * [`char::decode_utf16`]
7754 * [`char::DecodeUtf16`]
7755 * [`char::DecodeUtf16Error`]
7756 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7757 * [`BTreeSet::take`]
7758 * [`BTreeSet::replace`]
7761 * [`HashSet::replace`]
7763 * [`OsString::with_capacity`]
7764 * [`OsString::clear`]
7765 * [`OsString::capacity`]
7766 * [`OsString::reserve`]
7767 * [`OsString::reserve_exact`]
7768 * [`OsStr::is_empty`]
7770 * [`std::os::unix::thread`]
7773 * [`JoinHandleExt::as_pthread_t`]
7774 * [`JoinHandleExt::into_pthread_t`]
7775 * [`HashSet::hasher`]
7776 * [`HashMap::hasher`]
7777 * [`CommandExt::exec`]
7778 * [`File::try_clone`]
7779 * [`SocketAddr::set_ip`]
7780 * [`SocketAddr::set_port`]
7781 * [`SocketAddrV4::set_ip`]
7782 * [`SocketAddrV4::set_port`]
7783 * [`SocketAddrV6::set_ip`]
7784 * [`SocketAddrV6::set_port`]
7785 * [`SocketAddrV6::set_flowinfo`]
7786 * [`SocketAddrV6::set_scope_id`]
7787 * [`slice::copy_from_slice`]
7788 * [`ptr::read_volatile`]
7789 * [`ptr::write_volatile`]
7790 * [`OpenOptions::create_new`]
7791 * [`TcpStream::set_nodelay`]
7792 * [`TcpStream::nodelay`]
7793 * [`TcpStream::set_ttl`]
7794 * [`TcpStream::ttl`]
7795 * [`TcpStream::set_only_v6`]
7796 * [`TcpStream::only_v6`]
7797 * [`TcpStream::take_error`]
7798 * [`TcpStream::set_nonblocking`]
7799 * [`TcpListener::set_ttl`]
7800 * [`TcpListener::ttl`]
7801 * [`TcpListener::set_only_v6`]
7802 * [`TcpListener::only_v6`]
7803 * [`TcpListener::take_error`]
7804 * [`TcpListener::set_nonblocking`]
7805 * [`UdpSocket::set_broadcast`]
7806 * [`UdpSocket::broadcast`]
7807 * [`UdpSocket::set_multicast_loop_v4`]
7808 * [`UdpSocket::multicast_loop_v4`]
7809 * [`UdpSocket::set_multicast_ttl_v4`]
7810 * [`UdpSocket::multicast_ttl_v4`]
7811 * [`UdpSocket::set_multicast_loop_v6`]
7812 * [`UdpSocket::multicast_loop_v6`]
7813 * [`UdpSocket::set_multicast_ttl_v6`]
7814 * [`UdpSocket::multicast_ttl_v6`]
7815 * [`UdpSocket::set_ttl`]
7816 * [`UdpSocket::ttl`]
7817 * [`UdpSocket::set_only_v6`]
7818 * [`UdpSocket::only_v6`]
7819 * [`UdpSocket::join_multicast_v4`]
7820 * [`UdpSocket::join_multicast_v6`]
7821 * [`UdpSocket::leave_multicast_v4`]
7822 * [`UdpSocket::leave_multicast_v6`]
7823 * [`UdpSocket::take_error`]
7824 * [`UdpSocket::connect`]
7825 * [`UdpSocket::send`]
7826 * [`UdpSocket::recv`]
7827 * [`UdpSocket::set_nonblocking`]
7832 * [`std::sync::Once` is poisoned if its initialization function
7834 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7835 * [Most types implement `fmt::Debug`][1.9db].
7836 * [The default buffer size used by `BufReader` and `BufWriter` was
7837 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7838 used by other languages.
7839 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7840 `Duration` additionally implements `*=` and `/=`][1.9ta].
7841 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7842 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7843 * [`Chain` implements `BufRead`][1.9ch].
7844 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7849 * [Cargo can now run concurrently][1.9cc].
7850 * [Top-level overrides allow specific revisions of crates to be
7851 overridden through the entire crate graph][1.9ct]. This is intended
7852 to make upgrades easier for large projects, by allowing crates to be
7853 forked temporarily until they've been upgraded and republished.
7854 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7855 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7856 on the commandline][1.9cf]. `rustc` arguments can also be specified
7857 in the `build.rustflags` configuration key.
7862 * [The time complexity of comparing variables for equivalence during type
7863 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7864 to major compilation time improvement in some scenarios.
7865 * [`ToString` is specialized for `str`, giving it the same performance
7866 as `to_owned`][1.9ts].
7867 * [Spawning processes with `Command::output` no longer creates extra
7869 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7870 for C-like enums][1.9cl].
7875 * [Passing the `--quiet` flag to a test runner will produce
7876 much-abbreviated output][1.9q].
7877 * The Rust Project now publishes std binaries for the
7878 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7879 `i586-pc-windows-msvc` targets.
7884 * [`std::sync::Once` is poisoned if its initialization function
7886 * [It is illegal to define methods with the same name in overlapping
7887 inherent `impl` blocks][1.9sn].
7888 * [`fn` item types are zero sized, and each `fn` names a unique
7889 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7890 `transmute` on a `fn` type will generate a warning for a few cycles,
7891 then will be converted to an error.
7892 * [Improvements to const evaluation may trigger new errors when integer
7893 literals are out of range][1.9ce].
7896 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7897 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7898 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7899 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7900 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7901 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7902 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7903 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7904 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7905 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7906 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7907 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7908 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7909 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7910 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7911 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7912 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7913 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7914 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7915 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7916 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7917 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7918 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7919 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7920 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7921 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7922 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7923 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7924 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7925 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7926 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7927 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7928 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7929 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7930 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7931 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7932 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7933 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7934 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7935 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7936 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7937 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7938 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7939 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7940 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7941 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7942 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7943 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7944 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7945 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7946 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7947 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7948 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7949 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7950 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7951 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7952 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7953 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7954 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7955 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7956 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7957 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7958 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7959 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7960 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7961 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7962 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7963 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7964 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7965 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7966 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7967 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7968 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7969 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7970 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7971 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7972 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7973 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7974 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7975 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7976 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7977 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7978 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7979 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7980 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7981 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7982 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7983 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7984 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7985 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7986 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7987 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7988 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7989 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7990 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7991 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7992 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7993 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7994 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7995 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7996 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7997 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7998 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7999 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8000 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8001 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8002 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8003 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8004 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8005 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8008 Version 1.8.0 (2016-04-14)
8009 ==========================
8014 * Rust supports overloading of compound assignment statements like
8015 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8016 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8017 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8019 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8020 addition to the non-braced form, `struct Foo;`. [RFC 218].
8026 * [`str::encode_utf16`] (renamed from `utf16_units`)
8027 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8030 * [`ptr::drop_in_place`]
8032 * [`time::SystemTime`]
8034 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8035 * [`Instant::elapsed`]
8036 * [`SystemTime::now`]
8037 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8038 * [`SystemTime::elapsed`]
8039 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8040 * [`SystemTimeError`]
8041 * [`SystemTimeError::duration`]
8042 * Various impls for `SystemTimeError`
8044 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8045 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8046 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8047 * [The `write!` and `writeln!` macros correctly emit errors if any of
8048 their arguments can't be formatted][1.8w].
8049 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8050 * [The Unix-specific `raw` modules, which contain a number of
8051 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8052 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8053 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8054 across platforms was making it difficult to implement `std`
8055 correctly. Those that need these definitions should use the `libc`
8057 * The Unix-specific `MetadataExt` traits, including
8058 `os::unix::fs::MetadataExt`, which expose values such as inode
8059 numbers [no longer return platform-specific types][1.8r], but
8060 instead return widened integers. [RFC 1415].
8061 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8062 * [Atomic loads and stores are not volatile][1.8a].
8063 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8068 * [Inlining hash functions lead to a 3% compile-time improvement in
8069 some workloads][1.8h].
8070 * When using jemalloc, its symbols are [unprefixed so that it
8071 overrides the libc malloc implementation][1.8h]. This means that for
8072 rustc, LLVM is now using jemalloc, which results in a 6%
8073 compile-time improvement on a specific workload.
8074 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8079 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8080 i686-pc-windows-msvc is now considered a tier-1 platform.
8081 * [The `--print targets` flag prints a list of supported targets][1.8t].
8082 * [The `--print cfg` flag prints the `cfg`s defined for the current
8084 * [`rustc` can be built with an new Cargo-based build system, written
8085 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8086 build system. To enable it configure with `configure --rustbuild`.
8087 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8088 variants while also indicating the total number of missing variants
8089 if more than 3][1.8m].
8090 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8091 * The Rust Project now publishes binary releases of the standard
8092 library for a number of tier-2 targets:
8093 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8094 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8095 `x86_64-rumprun-netbsd`. These can be installed with
8096 tools such as [multirust][1.8mr].
8101 * [`cargo init` creates a new Cargo project in the current
8102 directory][1.8ci]. It is otherwise like `cargo new`.
8103 * [Cargo has configuration keys for `-v` and
8104 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8105 `[term]` section of `.cargo/config`.
8106 * [Configuration keys that evaluate to strings or integers can be set
8107 via environment variables][1.8ce]. For example the `build.jobs` key
8108 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8109 precedence over config files.
8110 * [Target-specific dependencies support Rust `cfg` syntax for
8111 describing targets][1.8cfg] so that dependencies for multiple
8112 targets can be specified together. [RFC 1361].
8113 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8114 `RUSTDOC` take precedence over the `build.target-dir`,
8115 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8116 * [The child process tree is killed on Windows when Cargo is
8118 * [The `build.target` configuration value sets the target platform,
8119 like `--target`][1.8ct].
8124 * [Unstable compiler flags have been further restricted][1.8u]. Since
8125 1.0 `-Z` flags have been considered unstable, and other flags that
8126 were considered unstable additionally required passing `-Z
8127 unstable-options` to access. Unlike unstable language and library
8128 features though, these options have been accessible on the stable
8129 release channel. Going forward, *new unstable flags will not be
8130 available on the stable release channel*, and old unstable flags
8131 will warn about their usage. In the future, all unstable flags will
8132 be unavailable on the stable release channel.
8133 * [It is no longer possible to `match` on empty enum variants using
8134 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8135 * The Unix-specific `MetadataExt` traits, including
8136 `os::unix::fs::MetadataExt`, which expose values such as inode
8137 numbers [no longer return platform-specific types][1.8r], but
8138 instead return widened integers. [RFC 1415].
8139 * [Modules sourced from the filesystem cannot appear within arbitrary
8140 blocks, but only within other modules][1.8mf].
8141 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8142 * On Unix, [stack overflow triggers a runtime abort instead of a
8144 * [`Command::spawn` and its equivalents return an error if any of
8145 its command-line arguments contain interior `NUL`s][1.8n].
8146 * [Tuple and unit enum variants from other crates are in the type
8148 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8149 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8150 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8151 instead of `foo.lib`.
8154 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8155 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8156 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8157 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8158 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8159 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8160 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8161 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8162 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8163 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8164 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8165 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8166 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8167 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8168 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8169 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8170 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8171 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8172 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8173 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8174 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8175 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8176 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8177 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8178 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8179 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8180 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8181 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8182 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8183 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8184 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8185 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8186 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8187 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8188 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8189 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8190 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8191 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8192 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8193 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8194 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8195 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8196 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8197 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8198 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8199 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8200 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8201 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8202 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8203 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8204 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8205 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8206 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8207 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8208 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8209 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8210 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8211 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8212 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8213 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8216 Version 1.7.0 (2016-03-03)
8217 ==========================
8224 * [`Path::strip_prefix`] (renamed from relative_from)
8225 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8227 * [`Ipv4Addr::is_loopback`]
8228 * [`Ipv4Addr::is_private`]
8229 * [`Ipv4Addr::is_link_local`]
8230 * [`Ipv4Addr::is_multicast`]
8231 * [`Ipv4Addr::is_broadcast`]
8232 * [`Ipv4Addr::is_documentation`]
8234 * [`Ipv6Addr::is_unspecified`]
8235 * [`Ipv6Addr::is_loopback`]
8236 * [`Ipv6Addr::is_multicast`]
8239 * [`Vec::as_mut_slice`]
8241 * [`String::as_str`]
8242 * [`String::as_mut_str`]
8244 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8246 * `<[T]>::`[`sort_by_key`]
8247 * checked, saturated, and overflowing operations
8248 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8249 * [`i32::saturating_mul`]
8250 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8251 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8252 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8253 * [`u32::saturating_mul`]
8254 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8255 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8256 * and checked, saturated, and overflowing operations for other primitive types
8258 * [`ffi::IntoStringError`]
8259 * [`CString::into_string`]
8260 * [`CString::into_bytes`]
8261 * [`CString::into_bytes_with_nul`]
8262 * `From<CString> for Vec<u8>`
8264 * [`IntoStringError::into_cstring`]
8265 * [`IntoStringError::utf8_error`]
8266 * `Error for IntoStringError`
8268 * [`std::hash::BuildHasher`]
8269 * [`BuildHasher::Hasher`]
8270 * [`BuildHasher::build_hasher`]
8271 * [`std::hash::BuildHasherDefault`]
8272 * [`HashMap::with_hasher`]
8273 * [`HashMap::with_capacity_and_hasher`]
8274 * [`HashSet::with_hasher`]
8275 * [`HashSet::with_capacity_and_hasher`]
8276 * [`std::collections::hash_map::RandomState`]
8277 * [`RandomState::new`]
8278 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8279 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8280 from bytes is faster.
8281 * [The performance of `LineWriter` (and thus `io::stdout`) was
8282 improved by using `memchr` to search for newlines][1.7m].
8283 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8284 `f64` variants were stabilized previously.
8285 * [`BTreeMap` was rewritten to use less memory and improve the performance
8286 of insertion and iteration, the latter by as much as 5x][1.7bm].
8287 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8288 covariant over their contained type][1.7bt].
8289 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8290 over their contained type][1.7ll].
8291 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8293 * [`Any` is implemented for unsized types][1.7a].
8294 * [`Hash` is implemented for `Duration`][1.7h].
8299 * [When running tests with `--test`, rustdoc will pass `--cfg`
8300 arguments to the compiler][1.7dt].
8301 * [The compiler is built with RPATH information by default][1.7rpa].
8302 This means that it will be possible to run `rustc` when installed in
8303 unusual configurations without configuring the dynamic linker search
8305 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8306 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8307 over `LD_LIBRARY_PATH`.
8312 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8313 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8314 * [The `rerun-if-changed` build script directive no longer causes the
8315 build script to incorrectly run twice in certain scenarios][1.7rr].
8320 * Soundness fixes to the interactions between associated types and
8321 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8322 code that violates the new rules. This is a significant change that
8323 is known to break existing code, so it has emitted warnings for the
8324 new error cases since 1.4 to give crate authors time to adapt. The
8325 details of what is changing are subtle; read the RFC for more.
8326 * [Several bugs in the compiler's visibility calculations were
8327 fixed][1.7v]. Since this was found to break significant amounts of
8328 code, the new errors will be emitted as warnings for several release
8329 cycles, under the `private_in_public` lint.
8330 * Defaulted type parameters were accidentally accepted in positions
8331 that were not intended. In this release, [defaulted type parameters
8332 appearing outside of type definitions will generate a
8333 warning][1.7d], which will become an error in future releases.
8334 * [Parsing "." as a float results in an error instead of 0][1.7p].
8335 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8336 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8338 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8339 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8340 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8341 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8342 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8343 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8344 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8345 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8346 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8347 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8348 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8349 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8350 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8351 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8352 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8353 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8354 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8355 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8356 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8357 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8358 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8359 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8360 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8361 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8362 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8363 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8364 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8365 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8366 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8367 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8368 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8369 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8370 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8371 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8372 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8373 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8374 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8375 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8376 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8377 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8378 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8379 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8380 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8381 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8382 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8383 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8384 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8385 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8386 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8387 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8388 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8389 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8390 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8391 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8392 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8393 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8394 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8395 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8396 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8397 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8398 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8399 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8400 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8401 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8402 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8403 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8404 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8405 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8406 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8407 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8408 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8409 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8410 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8411 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8412 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8413 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8414 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8415 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8416 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8419 Version 1.6.0 (2016-01-21)
8420 ==========================
8425 * The `#![no_std]` attribute causes a crate to not be linked to the
8426 standard library, but only the [core library][1.6co], as described
8427 in [RFC 1184]. The core library defines common types and traits but
8428 has no platform dependencies whatsoever, and is the basis for Rust
8429 software in environments that cannot support a full port of the
8430 standard library, such as operating systems. Most of the core
8431 library is now stable.
8437 [`Read::read_exact`],
8438 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8439 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8440 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8441 [`os::unix::fs::DirBuilderExt`],
8442 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8443 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8444 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8445 [`collections::hash_map::Drain`],
8446 [`collections::hash_map::HashMap::drain`],
8447 [`collections::hash_set::Drain`],
8448 [`collections::hash_set::HashSet::drain`],
8449 [`collections::binary_heap::Drain`],
8450 [`collections::binary_heap::BinaryHeap::drain`],
8451 [`Vec::extend_from_slice`] (renamed from `push_all`),
8452 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8453 [`RwLock::into_inner`],
8454 [`Iterator::min_by_key`] (renamed from `min_by`),
8455 [`Iterator::max_by_key`] (renamed from `max_by`).
8456 * The [core library][1.6co] is stable, as are most of its APIs.
8457 * [The `assert_eq!` macro supports arguments that don't implement
8458 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8460 * Several timer functions that take duration in milliseconds [are
8461 deprecated in favor of those that take `Duration`][1.6ms]. These
8462 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8463 `thread::park_timeout_ms`.
8464 * The algorithm by which `Vec` reserves additional elements was
8465 [tweaked to not allocate excessive space][1.6a] while still growing
8467 * `From` conversions are [implemented from integers to floats][1.6f]
8468 in cases where the conversion is lossless. Thus they are not
8469 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8470 or `f64`. They are also not implemented for `isize` and `usize`
8471 because the implementations would be platform-specific. `From` is
8472 also implemented from `f32` to `f64`.
8473 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8474 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8475 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8476 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8478 * Sorting slices that are already sorted [is 50% faster in some
8484 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8485 * Cargo build scripts can specify their dependencies by emitting the
8486 [`rerun-if-changed`][1.6rr] key.
8487 * crates.io will reject publication of crates with dependencies that
8488 have a wildcard version constraint. Crates with wildcard
8489 dependencies were seen to cause a variety of problems, as described
8490 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8492 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8493 release folder. A variety of artifacts that Cargo failed to clean
8494 are now correctly deleted.
8499 * The `unreachable_code` lint [warns when a function call's argument
8501 * The parser indicates [failures that may be caused by
8502 confusingly-similar Unicode characters][1.6uc]
8503 * Certain macro errors [are reported at definition time][1.6m], not
8509 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8510 environment variable when locating crates. This was a pre-cargo
8511 feature for integrating with the package manager that was
8512 accidentally never removed.
8513 * [A number of bugs were fixed in the privacy checker][1.6p] that
8514 could cause previously-accepted code to break.
8515 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8516 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8517 struct pattern syntax (`Foo(..)`) can no longer be used to match
8518 unit structs. This is a warning now, but will become an error in
8519 future releases. Patterns that share the same name as a const are
8521 * A bug was fixed that causes [rustc not to apply default type
8522 parameters][1.6xc] when resolving certain method implementations of
8523 traits defined in other crates.
8525 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8526 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8527 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8528 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8529 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8530 [1.6co]: http://doc.rust-lang.org/core/index.html
8531 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8532 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8533 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8534 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8535 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8536 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8537 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8538 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8539 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8540 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8541 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8542 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8543 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8544 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8545 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8546 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8547 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8548 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8549 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8550 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8551 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8552 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8553 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8554 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8555 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8556 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8557 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8558 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8559 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8560 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8561 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8562 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8563 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8564 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8565 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8566 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8567 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8568 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8569 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8570 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8571 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8574 Version 1.5.0 (2015-12-10)
8575 ==========================
8577 * ~700 changes, numerous bugfixes
8583 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8584 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8585 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8586 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8587 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8588 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8589 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8590 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8591 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8592 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8593 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8594 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8595 [`Path::read_link`], [`Path::symlink_metadata`],
8596 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8597 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8598 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8599 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8600 [`slice::split_first_mut`], [`slice::split_first`],
8601 [`slice::split_last_mut`], [`slice::split_last`],
8602 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8603 [`str::MatchIndices`], [`str::RMatchIndices`],
8604 [`str::match_indices`], [`str::rmatch_indices`],
8605 [`str::slice_mut_unchecked`], [`string::ParseError`].
8606 * Rust applications hosted on crates.io can be installed locally to
8607 `~/.cargo/bin` with the [`cargo install`] command. Among other
8608 things this makes it easier to augment Cargo with new subcommands:
8609 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8610 invoked as `cargo foo`.
8611 * Crates with wildcard (`*`) dependencies will [emit warnings when
8612 published][1.5w]. In 1.6 it will no longer be possible to publish
8613 crates with wildcard dependencies.
8618 * The rules determining when a particular lifetime must outlive
8619 a particular value (known as '[dropck]') have been [modified
8620 to not rely on parametricity][1.5p].
8621 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8622 and `Arc`][1.5a]. Because these smart pointer types implement
8623 `Deref`, this causes breakage in cases where the interior type
8624 contains methods of the same name.
8625 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8626 that they could drop their content. Soundness fix.
8627 * All method invocations are [properly checked][1.5wf1] for
8628 [well-formedness][1.5wf2]. Soundness fix.
8629 * Traits whose supertraits contain `Self` are [not object
8630 safe][1.5o]. Soundness fix.
8631 * Target specifications support a [`no_default_libraries`][1.5nd]
8632 setting that controls whether `-nodefaultlibs` is passed to the
8633 linker, and in turn the `is_like_windows` setting no longer affects
8634 the `-nodefaultlibs` flag.
8635 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8636 * The `#[inline]` and `#[repr]` attributes [can only appear
8637 in valid locations][1.5at].
8638 * Native libraries linked from the local crate are [passed to
8639 the linker before native libraries from upstream crates][1.5nl].
8640 * Two rarely-used attributes, `#[no_debug]` and
8641 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8642 * Negation of unsigned integers, which has been a warning for
8643 several releases, [is now behind a feature gate and will
8644 generate errors][1.5nu].
8645 * The parser accidentally accepted visibility modifiers on
8646 enum variants, a bug [which has been fixed][1.5ev].
8647 * [A bug was fixed that allowed `use` statements to import unstable
8653 * When evaluating expressions at compile-time that are not
8654 compile-time constants (const-evaluating expressions in non-const
8655 contexts), incorrect code such as overlong bitshifts and arithmetic
8656 overflow will [generate a warning instead of an error][1.5ce],
8657 delaying the error until runtime. This will allow the
8658 const-evaluator to be expanded in the future backwards-compatibly.
8659 * The `improper_ctypes` lint [no longer warns about using `isize` and
8660 `usize` in FFI][1.5ict].
8665 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8667 * `Default` is [implemented for mutable slices][1.5d].
8668 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8669 * There are now `From` conversions [between floating point
8670 types][1.5f] where the conversions are lossless.
8671 * There are now `From` conversions [between integer types][1.5i] where
8672 the conversions are lossless.
8673 * [`fs::Metadata` implements `Clone`][1.5fs].
8674 * The `parse` method [accepts a leading "+" when parsing
8676 * [`AsMut` is implemented for `Vec`][1.5am].
8677 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8678 been optimized][1.5cf] and no longer rely on the default impl.
8679 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8680 `unsafe extern "C"` function types now [implement `Clone`,
8681 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8682 `fmt::Debug` for up to 12 arguments][1.5fp].
8683 * [Dropping `Vec`s is much faster in unoptimized builds when the
8684 element types don't implement `Drop`][1.5dv].
8685 * A bug that caused in incorrect behavior when [combining `VecDeque`
8686 with zero-sized types][1.5vdz] was resolved.
8687 * [`PartialOrd` for slices is faster][1.5po].
8692 * [Crate metadata size was reduced by 20%][1.5md].
8693 * [Improvements to code generation reduced the size of libcore by 3.3
8694 MB and rustc's memory usage by 18MB][1.5m].
8695 * [Improvements to deref translation increased performance in
8696 unoptimized builds][1.5dr].
8697 * Various errors in trait resolution [are deduplicated to only be
8698 reported once][1.5te].
8699 * Rust has preliminary [support for rumprun kernels][1.5rr].
8700 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8702 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8703 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8704 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8705 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8706 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8707 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8708 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8709 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8710 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8711 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8712 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8713 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8714 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8715 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8716 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8717 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8718 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8719 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8720 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8721 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8722 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8723 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8724 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8725 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8726 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8727 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8728 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8729 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8730 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8731 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8732 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8733 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8734 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8735 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8736 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8737 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8738 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8739 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8740 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8741 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8742 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8743 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8744 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8745 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8746 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8747 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8748 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8749 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8750 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8751 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8752 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8753 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8754 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8755 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8756 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8757 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8758 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8759 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8760 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8761 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8762 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8763 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8764 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8765 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8766 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8767 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8768 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8769 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8770 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8771 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8772 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8773 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8774 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8775 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8776 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8777 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8778 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8779 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8780 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8781 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8782 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8783 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8784 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8785 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8786 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8787 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8788 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8789 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8790 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8792 Version 1.4.0 (2015-10-29)
8793 ==========================
8795 * ~1200 changes, numerous bugfixes
8800 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8801 GNU) are now supported and recommended for use.
8806 * [Several changes have been made to fix type soundness and improve
8807 the behavior of associated types][sound]. See [RFC 1214]. Although
8808 we have mostly introduced these changes as warnings this release, to
8809 become errors next release, there are still some scenarios that will
8810 see immediate breakage.
8811 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8812 line breaks in addition to `\n`][crlf].
8813 * [Loans of `'static` lifetime extend to the end of a function][stat].
8814 * [`str::parse` no longer introduces avoidable rounding error when
8815 parsing floating point numbers. Together with earlier changes to
8816 float formatting/output, "round trips" like f.to_string().parse()
8817 now preserve the value of f exactly. Additionally, leading plus
8818 signs are now accepted][fp3].
8824 * `use` statements that import multiple items [can now rename
8825 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8826 * [Binops work correctly on fat pointers][binfat].
8827 * `pub extern crate`, which does not behave as expected, [issues a
8828 warning][pec] until a better solution is found.
8833 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8834 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8835 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8836 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8837 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8838 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8839 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8840 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8841 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8842 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8843 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8844 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8845 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8846 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8847 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8848 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8849 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8850 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8852 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8853 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8854 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8855 `f64::from_str_radix`.
8856 * [Reverse-searching strings is faster with the 'two-way'
8858 * [`std::io::copy` allows `?Sized` arguments][cc].
8859 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8860 [override `count`, `nth` and `last` with an *O*(1)
8861 implementation][it].
8862 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8863 * [`IntoRawFd` has been added to the Unix-specific prelude,
8864 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8866 * [`Extend<String>` and `FromIterator<String` are both implemented for
8868 * [`IntoIterator` is implemented for references to `Option` and
8870 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8871 Copy`][ext] as part of [RFC 839]. This will cause type inference
8872 breakage in rare situations.
8873 * [`BinaryHeap` implements `Debug`][bh2].
8874 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8876 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8877 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8878 * [String comparison is faster][faststr].
8879 * `&mut T` where `T: std::fmt::Write` [also implements
8880 `std::fmt::Write`][mutw].
8881 * [A stable regression in `VecDeque::push_back` and other
8882 capacity-altering methods that caused panics for zero-sized types
8884 * [Function pointers implement traits for up to 12 parameters][fp2].
8889 * The compiler [no longer uses the 'morestack' feature to prevent
8890 stack overflow][mm]. Instead it uses guard pages and stack
8891 probes (though stack probes are not yet implemented on any platform
8893 * [The compiler matches traits faster when projections are involved][p].
8894 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8896 * [Cargo now displays useful information about what its doing during
8897 `cargo update`][cu].
8899 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8900 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8901 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8902 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8903 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8904 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8905 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8906 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8907 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8908 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8909 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8910 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8911 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8912 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8913 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8914 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8915 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8916 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8917 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8918 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8919 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8920 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8921 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8922 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8923 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8924 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8925 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8926 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8927 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8928 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8929 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8930 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8931 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8932 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8933 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8934 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8935 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8936 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8937 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8938 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8939 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8940 [bh2]: https://github.com/rust-lang/rust/pull/28156
8941 [binfat]: https://github.com/rust-lang/rust/pull/28270
8942 [bm]: https://github.com/rust-lang/rust/pull/28197
8943 [cc]: https://github.com/rust-lang/rust/pull/27531
8944 [crlf]: https://github.com/rust-lang/rust/pull/28034
8945 [cu]: https://github.com/rust-lang/cargo/pull/1931
8946 [d]: https://github.com/rust-lang/rust/pull/27825
8947 [dep]: https://github.com/rust-lang/rust/pull/28339
8948 [es]: https://github.com/rust-lang/rust/pull/27956
8949 [ext]: https://github.com/rust-lang/rust/pull/28094
8950 [faststr]: https://github.com/rust-lang/rust/pull/28338
8951 [ffi]: https://github.com/rust-lang/rust/pull/28779
8952 [fp]: https://github.com/rust-lang/rust/pull/28268
8953 [fp2]: https://github.com/rust-lang/rust/pull/28560
8954 [fp3]: https://github.com/rust-lang/rust/pull/27307
8955 [i]: https://github.com/rust-lang/rust/pull/27451
8956 [into2]: https://github.com/rust-lang/rust/pull/28039
8957 [it]: https://github.com/rust-lang/rust/pull/27652
8958 [mm]: https://github.com/rust-lang/rust/pull/27338
8959 [mutw]: https://github.com/rust-lang/rust/pull/28368
8960 [sound]: https://github.com/rust-lang/rust/pull/27641
8961 [p]: https://github.com/rust-lang/rust/pull/27866
8962 [pec]: https://github.com/rust-lang/rust/pull/28486
8963 [pr]: https://github.com/rust-lang/rust/pull/27896
8964 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8965 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8966 [s]: https://github.com/rust-lang/rust/pull/27474
8967 [stab]: https://github.com/rust-lang/rust/pull/28339
8968 [stat]: https://github.com/rust-lang/rust/pull/28321
8969 [vd]: https://github.com/rust-lang/rust/pull/28494
8971 Version 1.3.0 (2015-09-17)
8972 ==============================
8974 * ~900 changes, numerous bugfixes
8979 * The [new object lifetime defaults][nold] have been [turned
8980 on][nold2] after a cycle of warnings about the change. Now types
8981 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8982 being interpreted as `&'a Box<Trait+'a>` to `&'a
8983 Box<Trait+'static>`.
8984 * [The Rustonomicon][nom] is a new book in the official documentation
8985 that dives into writing unsafe Rust.
8986 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8987 timekeeping is employed by other std APIs, as well as out-of-tree
8993 * The [new object lifetime defaults][nold] have been [turned
8994 on][nold2] after a cycle of warnings about the change.
8995 * There is a known [regression][lr] in how object lifetime elision is
8996 interpreted, the proper solution for which is undetermined.
8997 * The `#[prelude_import]` attribute, an internal implementation
8998 detail, was accidentally stabilized previously. [It has been put
8999 behind the `prelude_import` feature gate][pi]. This change is
9000 believed to break no existing code.
9001 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9002 [more sane for dynamically sized types][dst3]. Code that relied on
9003 the previous behavior is thought to be broken.
9004 * The `dropck` rules, which checks that destructors can't access
9005 destroyed values, [have been updated][dropck] to match the
9006 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9007 cause some previously-compiling code to no longer build.
9012 * The [new object lifetime defaults][nold] have been [turned
9013 on][nold2] after a cycle of warnings about the change.
9014 * Semicolons may [now follow types and paths in
9015 macros](https://github.com/rust-lang/rust/pull/27000).
9016 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9017 [more sane for dynamically sized types][dst3]. Code that relied on
9018 the previous behavior is not known to exist, and suspected to be
9020 * `'static` variables [may now be recursive][st].
9021 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9022 implementations correctly.
9023 * The `dropck` rules, which checks that destructors can't access
9024 destroyed values, [have been updated][dropck] to match the
9030 * The [`Duration`] API, [has been stabilized][ds], as well as the
9031 `std::time` module, which presently contains only `Duration`.
9032 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9033 * The owned C string, [`CString`], implements [`Borrow`] and the
9034 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9035 these allow C strings to be borrowed and cloned in generic code.
9036 * [`CStr`] implements [`Debug`].
9037 * [`AtomicPtr`] implements [`Debug`].
9038 * [`Error`] trait objects [can be downcast to their concrete types][e]
9039 in many common configurations, using the [`is`], [`downcast`],
9040 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9042 * Searching for substrings now [employs the two-way algorithm][search]
9043 instead of doing a naive search. This gives major speedups to a
9044 number of methods, including [`contains`][sc], [`find`][sf],
9045 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9046 [`ends_with`][sew] are also faster.
9047 * The performance of `PartialEq` for slices is [much faster][ps].
9048 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9049 is overridden and optimized by the implementations for scalars.
9050 * The [`Hasher`] trait now has a number of specialized `write_*`
9051 methods for primitive types, for efficiency.
9052 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9053 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9054 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9055 of [`std::error::Error::cause`][iec] also delegates to the inner
9057 * [`process::Child`][pc] gained the [`id`] method, which returns a
9058 `u32` representing the platform-specific process identifier.
9059 * The [`connect`] method on slices is deprecated, replaced by the new
9060 [`join`] method (note that both of these are on the *unstable*
9061 [`SliceConcatExt`] trait, but through the magic of the prelude are
9062 available to stable code anyway).
9063 * The [`Div`] operator is implemented for [`Wrapping`] types.
9064 * [`DerefMut` is implemented for `String`][dms].
9065 * Performance of SipHash (the default hasher for `HashMap`) is
9066 [better for long data][sh].
9067 * [`AtomicPtr`] implements [`Send`].
9068 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9069 are now [specialized to use uninitialized buffers for increased
9071 * Lifetime parameters of foreign functions [are now resolved
9077 * Rust can now, with some coercion, [produce programs that run on
9078 Windows XP][xp], though XP is not considered a supported platform.
9079 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9080 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9081 recommended for use in 1.3, though should be fully-functional
9082 in the [64-bit 1.4 beta][b14].
9083 * On Fedora-based systems installation will [properly configure the
9084 dynamic linker][fl].
9085 * The compiler gained many new extended error descriptions, which can
9086 be accessed with the `--explain` flag.
9087 * The `dropck` pass, which checks that destructors can't access
9088 destroyed values, [has been rewritten][27261]. This fixes some
9089 soundness holes, and as such will cause some previously-compiling
9090 code to no longer build.
9091 * `rustc` now uses [LLVM to write archive files where possible][ar].
9092 Eventually this will eliminate the compiler's dependency on the ar
9094 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9095 supported FreeBSD on x86_64).
9096 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9097 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9099 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9100 will kill the process instead of leaking][nlp].
9102 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9103 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9104 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9105 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9106 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9107 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9108 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9109 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9110 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9111 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9112 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9113 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9114 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9115 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9116 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9117 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9118 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9119 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9120 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9121 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9122 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9123 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9124 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9125 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9126 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9127 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9128 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9129 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9130 [ar]: https://github.com/rust-lang/rust/pull/26926
9131 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9132 [dms]: https://github.com/rust-lang/rust/pull/26241
9133 [27261]: https://github.com/rust-lang/rust/pull/27261
9134 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9135 [ds]: https://github.com/rust-lang/rust/pull/26818
9136 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9137 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9138 [dst3]: https://github.com/rust-lang/rust/pull/27351
9139 [e]: https://github.com/rust-lang/rust/pull/24793
9140 [f]: https://github.com/rust-lang/rust/pull/26588
9141 [26959]: https://github.com/rust-lang/rust/pull/26959
9142 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9143 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9144 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9145 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9146 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9147 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9148 [lic]: https://github.com/rust-lang/rust/pull/26583
9149 [lnu]: https://github.com/rust-lang/rust/pull/27026
9150 [lr]: https://github.com/rust-lang/rust/issues/27248
9151 [lum]: https://github.com/rust-lang/rust/pull/26378
9152 [lur]: https://github.com/rust-lang/rust/pull/26783
9153 [nlp]: https://github.com/rust-lang/rust/pull/27176
9154 [nold2]: https://github.com/rust-lang/rust/pull/27045
9155 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9156 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9157 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9158 [pi]: https://github.com/rust-lang/rust/pull/26699
9159 [ps]: https://github.com/rust-lang/rust/pull/26884
9160 [rte]: https://github.com/rust-lang/rust/pull/26950
9161 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9162 [search]: https://github.com/rust-lang/rust/pull/26327
9163 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9164 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9165 [sh]: https://github.com/rust-lang/rust/pull/27280
9166 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9167 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9168 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9169 [st]: https://github.com/rust-lang/rust/pull/26630
9170 [win1]: https://github.com/rust-lang/rust/pull/26569
9171 [win2]: https://github.com/rust-lang/rust/pull/26741
9172 [win3]: https://github.com/rust-lang/rust/pull/26741
9173 [win4]: https://github.com/rust-lang/rust/pull/27210
9174 [xp]: https://github.com/rust-lang/rust/pull/26569
9176 Version 1.2.0 (2015-08-07)
9177 ==========================
9179 * ~1200 changes, numerous bugfixes
9184 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9185 like `Rc` to contain types without a fixed size, arrays and trait
9186 objects, finally enabling use of `Rc<[T]>` and completing the
9187 implementation of DST.
9188 * [Parallel codegen][parcodegen] is now working again, which can
9189 substantially speed up large builds in debug mode; It also gets
9190 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9191 jobs). It's not enabled by default, but will be "in the near
9192 future". It can be activated with the `-C codegen-units=N` flag to
9194 * This is the first release with [experimental support for linking
9195 with the MSVC linker and lib C on Windows (instead of using the GNU
9196 variants via MinGW)][win]. It is yet recommended only for the most
9197 intrepid Rustaceans.
9198 * Benchmark compilations are showing a 30% improvement in
9199 bootstrapping over 1.1.
9204 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9205 unicode case mapping, which is a previously-planned change in
9206 behavior and considered a bugfix.
9207 * [`mem::align_of`] now specifies [the *minimum alignment* for
9208 T][align], which is usually the alignment programs are interested
9209 in, and the same value reported by clang's
9210 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9212 * [The `#[packed]` attribute is no longer silently accepted by the
9213 compiler][packed]. This attribute did nothing and code that
9214 mentioned it likely did not work as intended.
9215 * Associated type defaults are [now behind the
9216 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9217 defaults *did not work*, but could be mentioned syntactically. As
9218 such this breakage has minimal impact.
9223 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9224 matching against dereferenceable values.
9229 * The [`Extend`] trait, which grows a collection from an iterator, is
9230 implemented over iterators of references, for `String`, `Vec`,
9231 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9232 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9233 * The [`iter::once`] function returns an iterator that yields a single
9234 element, and [`iter::empty`] returns an iterator that yields no
9236 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9237 over substring matches.
9238 * [`Cell`] and [`RefCell`] both implement `Eq`.
9239 * A number of methods for wrapping arithmetic are added to the
9240 integral types, [`wrapping_div`], [`wrapping_rem`],
9241 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9242 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9243 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9244 type.. It is illegal for the default arithmetic operations in Rust
9245 to overflow; the desire to wrap must be explicit.
9246 * The `{:#?}` formatting specifier [displays the alternate,
9247 pretty-printed][debugfmt] form of the `Debug` formatter. This
9248 feature was actually introduced prior to 1.0 with little
9250 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9251 for writing data to formatted strings, similar to [`io::Write`].
9252 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9253 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9254 are used by code generators to emit implementations of [`Debug`].
9255 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9256 methods that convert case, following Unicode case mapping.
9257 * It is now easier to handle poisoned locks. The [`PoisonError`]
9258 type, returned by failing lock operations, exposes `into_inner`,
9259 `get_ref`, and `get_mut`, which all give access to the inner lock
9260 guard, and allow the poisoned lock to continue to operate. The
9261 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9262 poisoned lock without attempting to take the lock.
9263 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9264 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9265 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9266 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9268 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9274 * `rustc` employs smarter heuristics for guessing at [typos].
9275 * `rustc` emits more efficient code for [no-op conversions between
9276 unsafe pointers][nop].
9277 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9278 resulting in faster compile times and smaller code.
9280 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9281 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9282 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9283 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9284 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9285 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9286 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9287 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9288 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9289 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9290 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9291 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9292 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9293 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9294 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9295 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9296 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9297 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9298 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9299 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9300 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9301 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9302 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9303 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9304 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9305 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9306 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9307 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9308 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9309 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9310 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9311 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9312 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9313 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9314 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9315 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9316 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9317 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9318 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9319 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9320 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9321 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9322 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9323 [align]: https://github.com/rust-lang/rust/pull/25646
9324 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9325 [typos]: https://github.com/rust-lang/rust/pull/26087
9326 [nop]: https://github.com/rust-lang/rust/pull/26336
9327 [fat]: https://github.com/rust-lang/rust/pull/26411
9328 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9329 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9330 [packed]: https://github.com/rust-lang/rust/pull/25541
9331 [ad]: https://github.com/rust-lang/rust/pull/27382
9332 [win]: https://github.com/rust-lang/rust/pull/25350
9334 Version 1.1.0 (2015-06-25)
9335 =========================
9337 * ~850 changes, numerous bugfixes
9342 * The [`std::fs` module has been expanded][fs] to expand the set of
9343 functionality exposed:
9344 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9345 don't incur a syscall on some platforms.
9346 * A `symlink_metadata` function has been added.
9347 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9348 access to all underlying information.
9349 * The compiler now contains extended explanations of many errors. When an error
9350 with an explanation occurs the compiler suggests using the `--explain` flag
9351 to read the explanation. Error explanations are also [available online][err-index].
9352 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9353 well as other work, the time to bootstrap the compiler decreased by
9359 * The [`str::split_whitespace`] method splits a string on unicode
9360 whitespace boundaries.
9361 * On both Windows and Unix, new extension traits provide conversion of
9362 I/O types to and from the underlying system handles. On Unix, these
9363 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9364 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9365 `TcpListener`, and `UpdSocket`. Further implementations for
9366 `std::process` will be stabilized later.
9367 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9368 Windows, symlinks can be created with
9369 `std::os::windows::symlink_dir` and
9370 `std::os::windows::symlink_file`.
9371 * The `mpsc::Receiver` type can now be converted into an iterator with
9372 `into_iter` on the [`IntoIterator`] trait.
9373 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9374 implementation of the [`From`] trait.
9375 * The `Debug` implementation for `RangeFull` [creates output that is
9376 more consistent with other implementations][rf].
9377 * [`Debug` is implemented for `File`][file].
9378 * The `Default` implementation for `Arc` [no longer requires `Sync +
9380 * [The `Iterator` methods `count`, `nth`, and `last` have been
9381 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9382 * Incorrect handling of paths on Windows has been improved in both the
9383 compiler and the standard library.
9384 * [`AtomicPtr` gained a `Default` implementation][ap].
9385 * In accordance with Rust's policy on arithmetic overflow `abs` now
9386 [panics on overflow when debug assertions are enabled][abs].
9387 * The [`Cloned`] iterator, which was accidentally left unstable for
9388 1.0 [has been stabilized][c].
9389 * The [`Incoming`] iterator, which iterates over incoming TCP
9390 connections, and which was accidentally unnamable in 1.0, [is now
9391 properly exported][inc].
9392 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9393 `sift_up` or `sift_down` panic][bh].
9394 * The [`split_off`] method of `LinkedList` [no longer corrupts
9395 the list in certain scenarios][ll].
9400 * Type checking performance [has improved notably][sk] with
9401 [multiple improvements][pre].
9402 * The compiler [suggests code changes][ch] for more errors.
9403 * rustc and it's build system have experimental support for [building
9404 toolchains against MUSL][m] instead of glibc on Linux.
9405 * The compiler defines the `target_env` cfg value, which is used for
9406 distinguishing toolchains that are otherwise for the same
9407 platform. Presently this is set to `gnu` for common GNU Linux
9408 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9409 * The [`cargo rustc`][crc] command invokes a build with custom flags
9411 * [Android executables are always position independent][pie].
9412 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9413 with `Drop`][24935].
9415 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9416 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9417 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9418 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9419 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9420 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9421 [rf]: https://github.com/rust-lang/rust/pull/24491
9422 [err-index]: https://doc.rust-lang.org/error-index.html
9423 [sk]: https://github.com/rust-lang/rust/pull/24615
9424 [pre]: https://github.com/rust-lang/rust/pull/25323
9425 [file]: https://github.com/rust-lang/rust/pull/24598
9426 [ch]: https://github.com/rust-lang/rust/pull/24683
9427 [arc]: https://github.com/rust-lang/rust/pull/24695
9428 [si]: https://github.com/rust-lang/rust/pull/24701
9429 [ap]: https://github.com/rust-lang/rust/pull/24834
9430 [m]: https://github.com/rust-lang/rust/pull/24777
9431 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9432 [crc]: https://github.com/rust-lang/cargo/pull/1568
9433 [pie]: https://github.com/rust-lang/rust/pull/24953
9434 [abs]: https://github.com/rust-lang/rust/pull/25441
9435 [c]: https://github.com/rust-lang/rust/pull/25496
9436 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9437 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9438 [inc]: https://github.com/rust-lang/rust/pull/25522
9439 [bh]: https://github.com/rust-lang/rust/pull/25856
9440 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9441 [ll]: https://github.com/rust-lang/rust/pull/26022
9442 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9443 [24935]: https://github.com/rust-lang/rust/pull/24935
9445 Version 1.0.0 (2015-05-15)
9446 ========================
9448 * ~1500 changes, numerous bugfixes
9453 * The vast majority of the standard library is now `#[stable]`. It is
9454 no longer possible to use unstable features with a stable build of
9456 * Many popular crates on [crates.io] now work on the stable release
9458 * Arithmetic on basic integer types now [checks for overflow in debug
9464 * Several [restrictions have been added to trait coherence][coh] in
9465 order to make it easier for upstream authors to change traits
9466 without breaking downstream code.
9467 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9468 improve error messages and macro behavior. For example, `0b1234` is
9469 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9470 * Trait bounds [are always invariant][inv], eliminating the need for
9471 the `PhantomFn` and `MarkerTrait` lang items, which have been
9473 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9474 "foo" as bar` syntax has been replaced with `extern crate foo as
9475 bar`, and Cargo now automatically translates "-" in *package* names
9476 to underscore for the crate name.
9477 * [Lifetime shadowing is an error][lt].
9478 * [`Send` no longer implies `'static`][send-rfc].
9479 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9480 `MyType::default()`.
9481 * Primitive types [now have inherent methods][prim-inherent],
9482 obviating the need for extension traits like `SliceExt`.
9483 * Methods with `Self: Sized` in their `where` clause are [considered
9484 object-safe][self-sized], allowing many extension traits like
9485 `IteratorExt` to be merged into the traits they extended.
9486 * You can now [refer to associated types][assoc-where] whose
9487 corresponding trait bounds appear only in a `where` clause.
9488 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9489 like `Send` and `Sync` are now library-defined.
9490 * A [Reflect trait][reflect] was introduced, which means that
9491 downcasting via the `Any` trait is effectively limited to concrete
9492 types. This helps retain the potentially-important "parametricity"
9493 property: generic code cannot behave differently for different type
9494 arguments except in minor ways.
9495 * The `unsafe_destructor` feature is now deprecated in favor of the
9496 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9502 * The `thread_local` module [has been renamed to `std::thread`][th].
9503 * The methods of `IteratorExt` [have been moved to the `Iterator`
9504 trait itself][23300].
9505 * Several traits that implement Rust's conventions for type
9506 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9507 [centralized in the `std::convert` module][con].
9508 * The `FromError` trait [was removed in favor of `From`][fe].
9509 * The basic sleep function [has moved to
9510 `std::thread::sleep_ms`][slp].
9511 * The `splitn` function now takes an `n` parameter that represents the
9512 number of items yielded by the returned iterator [instead of the
9513 number of 'splits'][spl].
9514 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9515 * [Derived implementations of `PartialOrd` now order enums according
9516 to their explicitly-assigned discriminants][po].
9517 * [Methods for searching strings are generic over `Pattern`s][pat],
9518 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9520 * [In method resolution, object methods are resolved before inherent
9522 * [`String::from_str` has been deprecated in favor of the `From` impl,
9523 `String::from`][24517].
9524 * [`io::Error` implements `Sync`][ios].
9525 * [The `words` method on `&str` has been replaced with
9526 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9528 * The new path and IO modules are complete and `#[stable]`. This
9529 was the major library focus for this cycle.
9530 * The path API was [revised][path-normalize] to normalize `.`,
9531 adjusting the tradeoffs in favor of the most common usage.
9532 * A large number of remaining APIs in `std` were also stabilized
9533 during this cycle; about 75% of the non-deprecated API surface
9535 * The new [string pattern API][string-pattern] landed, which makes
9536 the string slice API much more internally consistent and flexible.
9537 * A new set of [generic conversion traits][conversion] replaced
9538 many existing ad hoc traits.
9539 * Generic numeric traits were [completely removed][num-traits]. This
9540 was made possible thanks to inherent methods for primitive types,
9541 and the removal gives maximal flexibility for designing a numeric
9542 hierarchy in the future.
9543 * The `Fn` traits are now related via [inheritance][fn-inherit]
9544 and provide ergonomic [blanket implementations][fn-blanket].
9545 * The `Index` and `IndexMut` traits were changed to
9546 [take the index by value][index-value], enabling code like
9547 `hash_map["string"]` to work.
9548 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9549 `Copy` data is known to be `Clone` as well.
9554 * Many errors now have extended explanations that can be accessed with
9555 the `--explain` flag to `rustc`.
9556 * Many new examples have been added to the standard library
9558 * rustdoc has received a number of improvements focused on completion
9560 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9561 * Much headway was made on ecosystem-wide CI, making it possible
9562 to [compare builds for breakage][ci-compare].
9565 [crates.io]: http://crates.io
9566 [clo]: https://github.com/rust-lang/rust/pull/24034
9567 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9568 [con]: https://github.com/rust-lang/rust/pull/23875
9569 [cr]: https://github.com/rust-lang/rust/pull/23419
9570 [fe]: https://github.com/rust-lang/rust/pull/23879
9571 [23300]: https://github.com/rust-lang/rust/pull/23300
9572 [inv]: https://github.com/rust-lang/rust/pull/23938
9573 [ios]: https://github.com/rust-lang/rust/pull/24133
9574 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9575 [lt]: https://github.com/rust-lang/rust/pull/24057
9576 [meth]: https://github.com/rust-lang/rust/pull/24056
9577 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9578 [po]: https://github.com/rust-lang/rust/pull/24270
9579 [24517]: https://github.com/rust-lang/rust/pull/24517
9580 [slp]: https://github.com/rust-lang/rust/pull/23949
9581 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9582 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9583 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9584 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9585 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9586 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9587 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9588 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9589 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9590 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9591 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9592 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9593 [reflect]: https://github.com/rust-lang/rust/pull/23712
9594 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9595 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9596 [index-value]: https://github.com/rust-lang/rust/pull/23601
9597 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9598 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9599 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9600 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9601 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9602 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9605 Version 1.0.0-alpha.2 (2015-02-20)
9606 =====================================
9608 * ~1300 changes, numerous bugfixes
9612 * The various I/O modules were [overhauled][io-rfc] to reduce
9613 unnecessary abstractions and provide better interoperation with
9614 the underlying platform. The old `io` module remains temporarily
9616 * The standard library now [participates in feature gating][feat],
9617 so use of unstable libraries now requires a `#![feature(...)]`
9618 attribute. The impact of this change is [described on the
9619 forum][feat-forum]. [RFC][feat-rfc].
9623 * `for` loops [now operate on the `IntoIterator` trait][into],
9624 which eliminates the need to call `.iter()`, etc. to iterate
9625 over collections. There are some new subtleties to remember
9626 though regarding what sort of iterators various types yield, in
9627 particular that `for foo in bar { }` yields values from a move
9628 iterator, destroying the original collection. [RFC][into-rfc].
9629 * Objects now have [default lifetime bounds][obj], so you don't
9630 have to write `Box<Trait+'static>` when you don't care about
9631 storing references. [RFC][obj-rfc].
9632 * In types that implement `Drop`, [lifetimes must outlive the
9633 value][drop]. This will soon make it possible to safely
9634 implement `Drop` for types where `#[unsafe_destructor]` is now
9635 required. Read the [gorgeous RFC][drop-rfc] for details.
9636 * The fully qualified <T as Trait>::X syntax lets you set the Self
9637 type for a trait method or associated type. [RFC][ufcs-rfc].
9638 * References to types that implement `Deref<U>` now [automatically
9639 coerce to references][deref] to the dereferenced type `U`,
9640 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9641 should eliminate many unsightly uses of `&*`, as when converting
9642 from references to vectors into references to
9643 slices. [RFC][deref-rfc].
9644 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9645 `|:|`) is obsolete and closure kind is inferred from context.
9646 * [`Self` is a keyword][Self].
9650 * The `Show` and `String` formatting traits [have been
9651 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9652 their related purposes. Automatically getting a string
9653 conversion to use with `format!("{:?}", something_to_debug)` is
9654 now written `#[derive(Debug)]`.
9655 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9656 OsStr}`, provide strings in platform-specific encodings for easier
9657 interop with system APIs. [RFC][osstr-rfc].
9658 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9659 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9660 creating raw pointers.
9664 * Certain long error messages of the form 'expected foo found bar'
9665 are now [split neatly across multiple
9666 lines][multiline]. Examples in the PR.
9667 * On Unix Rust can be [uninstalled][un] by running
9668 `/usr/local/lib/rustlib/uninstall.sh`.
9669 * The `#[rustc_on_unimplemented]` attribute, requiring the
9670 'on_unimplemented' feature, lets rustc [display custom error
9671 messages when a trait is expected to be implemented for a type
9676 * Rust is tested against a [LALR grammar][lalr], which parses
9677 almost all the Rust files that rustc does.
9679 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9680 [close]: https://github.com/rust-lang/rust/pull/21843
9681 [deref]: https://github.com/rust-lang/rust/pull/21351
9682 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9683 [drop]: https://github.com/rust-lang/rust/pull/21972
9684 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9685 [feat]: https://github.com/rust-lang/rust/pull/21248
9686 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9687 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9688 [fmt]: https://github.com/rust-lang/rust/pull/21457
9689 [into]: https://github.com/rust-lang/rust/pull/20790
9690 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9691 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9692 [lalr]: https://github.com/rust-lang/rust/pull/21452
9693 [multiline]: https://github.com/rust-lang/rust/pull/19870
9694 [obj]: https://github.com/rust-lang/rust/pull/22230
9695 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9696 [onun]: https://github.com/rust-lang/rust/pull/20889
9697 [osstr]: https://github.com/rust-lang/rust/pull/21488
9698 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9699 [Self]: https://github.com/rust-lang/rust/pull/22158
9700 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9701 [un]: https://github.com/rust-lang/rust/pull/22256
9704 Version 1.0.0-alpha (2015-01-09)
9705 ==================================
9707 * ~2400 changes, numerous bugfixes
9711 * The language itself is considered feature complete for 1.0,
9712 though there will be many usability improvements and bugfixes
9713 before the final release.
9714 * Nearly 50% of the public API surface of the standard library has
9715 been declared 'stable'. Those interfaces are unlikely to change
9717 * The long-running debate over integer types has been
9718 [settled][ints]: Rust will ship with types named `isize` and
9719 `usize`, rather than `int` and `uint`, for pointer-sized
9720 integers. Guidelines will be rolled out during the alpha cycle.
9721 * Most crates that are not `std` have been moved out of the Rust
9722 distribution into the Cargo ecosystem so they can evolve
9723 separately and don't need to be stabilized as quickly, including
9724 'time', 'getopts', 'num', 'regex', and 'term'.
9725 * Documentation continues to be expanded with more API coverage, more
9726 examples, and more in-depth explanations. The guides have been
9727 consolidated into [The Rust Programming Language][trpl].
9728 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9729 * All official Rust binary installers now come with [Cargo], the
9730 Rust package manager.
9734 * Closures have been [completely redesigned][unboxed] to be
9735 implemented in terms of traits, can now be used as generic type
9736 bounds and thus monomorphized and inlined, or via an opaque
9737 pointer (boxed) as in the old system. The new system is often
9738 referred to as 'unboxed' closures.
9739 * Traits now support [associated types][assoc], allowing families
9740 of related types to be defined together and used generically in
9742 * Enum variants are [namespaced by their type names][enum].
9743 * [`where` clauses][where] provide a more versatile and attractive
9744 syntax for specifying generic bounds, though the previous syntax
9746 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9748 * Rust [no longer has a runtime][rt] of any description, and only
9749 supports OS threads, not green threads.
9750 * At long last, Rust has been overhauled for 'dynamically-sized
9751 types' ([DST]), which integrates 'fat pointers' (object types,
9752 arrays, and `str`) more deeply into the type system, making it
9754 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9755 `..j` that produce range types and which, when combined with the
9756 `Index` operator and multidispatch, leads to a convenient slice
9758 * The new range syntax revealed an ambiguity in the fixed-length
9759 array syntax, so now fixed length arrays [are written `[T;
9761 * The `Copy` trait is no longer implemented automatically. Unsafe
9762 pointers no longer implement `Sync` and `Send` so types
9763 containing them don't automatically either. `Sync` and `Send`
9764 are now 'unsafe traits' so one can "forcibly" implement them via
9765 `unsafe impl` if a type confirms to the requirements for them
9766 even though the internals do not (e.g. structs containing unsafe
9767 pointers like `Arc`). These changes are intended to prevent some
9768 footguns and are collectively known as [opt-in built-in
9769 traits][oibit] (though `Sync` and `Send` will soon become pure
9770 library types unknown to the compiler).
9771 * Operator traits now take their operands [by value][ops], and
9772 comparison traits can use multidispatch to compare one type
9773 against multiple other types, allowing e.g. `String` to be
9774 compared with `&str`.
9775 * `if let` and `while let` are no longer feature-gated.
9776 * Rust has adopted a more [uniform syntax for escaping unicode
9777 characters][unicode].
9778 * `macro_rules!` [has been declared stable][mac]. Though it is a
9779 flawed system it is sufficiently popular that it must be usable
9780 for 1.0. Effort has gone into [future-proofing][mac-future] it
9781 in ways that will allow other macro systems to be developed in
9782 parallel, and won't otherwise impact the evolution of the
9784 * The prelude has been [pared back significantly][prelude] such
9785 that it is the minimum necessary to support the most pervasive
9786 code patterns, and through [generalized where clauses][where]
9787 many of the prelude extension traits have been consolidated.
9788 * Rust's rudimentary reflection [has been removed][refl], as it
9789 incurred too much code generation for little benefit.
9790 * [Struct variants][structvars] are no longer feature-gated.
9791 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9792 known as 'higher-ranked trait bounds', this crucially allows
9793 unboxed closures to work.
9794 * Macros invocations surrounded by parens or square brackets and
9795 not terminated by a semicolon are [parsed as
9796 expressions][macros], which makes expressions like `vec![1i32,
9797 2, 3].len()` work as expected.
9798 * Trait objects now implement their traits automatically, and
9799 traits that can be coerced to objects now must be [object
9801 * Automatically deriving traits is now done with `#[derive(...)]`
9802 not `#[deriving(...)]` for [consistency with other naming
9803 conventions][derive].
9804 * Importing the containing module or enum at the same time as
9805 items or variants they contain is [now done with `self` instead
9806 of `mod`][self], as in use `foo::{self, bar}`
9807 * Glob imports are no longer feature-gated.
9808 * The `box` operator and `box` patterns have been feature-gated
9809 pending a redesign. For now unique boxes should be allocated
9810 like other containers, with `Box::new`.
9814 * A [series][coll1] of [efforts][coll2] to establish
9815 [conventions][coll3] for collections types has resulted in API
9816 improvements throughout the standard library.
9817 * New [APIs for error handling][err] provide ergonomic interop
9818 between error types, and [new conventions][err-conv] describe
9819 more clearly the recommended error handling strategies in Rust.
9820 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9821 it is easier to discuss failure in the context of error handling
9822 without making clarifications as to whether you are referring to
9823 the 'fail' macro or failure more generally.
9824 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9825 syscall when available.
9826 * The 'serialize' crate has been renamed 'rustc-serialize' and
9827 moved out of the distribution to Cargo. Although it is widely
9828 used now, it is expected to be superseded in the near future.
9829 * The `Show` formatter, typically implemented with
9830 `#[derive(Show)]` is [now requested with the `{:?}`
9831 specifier][show] and is intended for use by all types, for uses
9832 such as `println!` debugging. The new `String` formatter must be
9833 implemented by hand, uses the `{}` specifier, and is intended
9834 for full-fidelity conversions of things that can logically be
9835 represented as strings.
9839 * [Flexible target specification][flex] allows rustc's code
9840 generation to be configured to support otherwise-unsupported
9842 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9843 respective debuggers with Rust-appropriate pretty-printing.
9844 * The Windows installation of Rust is distributed with the
9845 MinGW components currently required to link binaries on that
9850 * Nullable enum optimizations have been extended to more types so
9851 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9852 space than the inner types themselves.
9853 * Work has begun on supporting AArch64.
9855 [Cargo]: https://crates.io
9856 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9857 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9858 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9859 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9860 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9861 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9862 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9863 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9864 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9865 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9866 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9867 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9868 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9869 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9870 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9871 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9872 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9873 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9874 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9875 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9876 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9877 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9878 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9879 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9880 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9881 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9882 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9883 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9884 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9885 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9886 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9887 [trpl]: https://doc.rust-lang.org/book/index.html
9888 [rbe]: http://rustbyexample.com/
9891 Version 0.12.0 (2014-10-09)
9892 =============================
9894 * ~1900 changes, numerous bugfixes
9898 * The introductory documentation (now called The Rust Guide) has
9899 been completely rewritten, as have a number of supplementary
9901 * Rust's package manager, Cargo, continues to improve and is
9902 sometimes considered to be quite awesome.
9903 * Many API's in `std` have been reviewed and updated for
9904 consistency with the in-development Rust coding
9905 guidelines. The standard library documentation tracks
9906 stabilization progress.
9907 * Minor libraries have been moved out-of-tree to the rust-lang org
9908 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9909 be installed with Cargo.
9910 * Lifetime elision allows lifetime annotations to be left off of
9911 function declarations in many common scenarios.
9912 * Rust now works on 64-bit Windows.
9915 * Indexing can be overloaded with the `Index` and `IndexMut`
9917 * The `if let` construct takes a branch only if the `let` pattern
9918 matches, currently behind the 'if_let' feature gate.
9919 * 'where clauses', a more flexible syntax for specifying trait
9920 bounds that is more aesthetic, have been added for traits and
9921 free functions. Where clauses will in the future make it
9922 possible to constrain associated types, which would be
9923 impossible with the existing syntax.
9924 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9925 the 'slicing_syntax' feature gate, and can be overloaded with
9926 the `Slice` or `SliceMut` traits.
9927 * The syntax for matching of sub-slices has been changed to use a
9928 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9929 consistency with other uses of `..` and to future-proof
9930 potential additional uses of the syntax.
9931 * The syntax for matching inclusive ranges in patterns has changed
9932 from `0..3` to `0...4` to be consistent with the exclusive range
9934 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9935 c]`) has been put behind the 'advanced_slice_patterns' feature
9936 gate and may be removed in the future.
9937 * Components of tuples and tuple structs can be extracted using
9938 the `value.0` syntax, currently behind the `tuple_indexing`
9940 * The `#[crate_id]` attribute is no longer supported; versioning
9941 is handled by the package manager.
9942 * Renaming crate imports are now written `extern crate foo as bar`
9943 instead of `extern crate bar = foo`.
9944 * Renaming use statements are now written `use foo as bar` instead
9946 * `let` and `match` bindings and argument names in macros are now
9948 * The new, more efficient, closure types ('unboxed closures') have
9949 been added under a feature gate, 'unboxed_closures'. These will
9950 soon replace the existing closure types, once higher-ranked
9951 trait lifetimes are added to the language.
9952 * `move` has been added as a keyword, for indicating closures
9953 that capture by value.
9954 * Mutation and assignment is no longer allowed in pattern guards.
9955 * Generic structs and enums can now have trait bounds.
9956 * The `Share` trait is now called `Sync` to free up the term
9957 'shared' to refer to 'shared reference' (the default reference
9959 * Dynamically-sized types have been mostly implemented,
9960 unifying the behavior of fat-pointer types with the rest of the
9962 * As part of dynamically-sized types, the `Sized` trait has been
9963 introduced, which qualifying types implement by default, and
9964 which type parameters expect by default. To specify that a type
9965 parameter does not need to be sized, write `<Sized? T>`. Most
9966 types are `Sized`, notable exceptions being unsized arrays
9967 (`[T]`) and trait types.
9968 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9969 * Lifetime bounds can now be applied to type parameters and object
9971 * The old, reference counted GC type, `Gc<T>` which was once
9972 denoted by the `@` sigil, has finally been removed. GC will be
9973 revisited in the future.
9976 * Library documentation has been improved for a number of modules.
9977 * Bit-vectors, collections::bitv has been modernized.
9978 * The url crate is deprecated in favor of
9979 http://github.com/servo/rust-url, which can be installed with
9981 * Most I/O stream types can be cloned and subsequently closed from
9983 * A `std::time::Duration` type has been added for use in I/O
9984 methods that rely on timers, as well as in the 'time' crate's
9985 `Timespec` arithmetic.
9986 * The runtime I/O abstraction layer that enabled the green thread
9987 scheduler to do non-thread-blocking I/O has been removed, along
9988 with the libuv-based implementation employed by the green thread
9989 scheduler. This will greatly simplify the future I/O work.
9990 * `collections::btree` has been rewritten to have a more
9991 idiomatic and efficient design.
9994 * rustdoc output now indicates the stability levels of API's.
9995 * The `--crate-name` flag can specify the name of the crate
9996 being compiled, like `#[crate_name]`.
9997 * The `-C metadata` specifies additional metadata to hash into
9998 symbol names, and `-C extra-filename` specifies additional
9999 information to put into the output filename, for use by the
10000 package manager for versioning.
10001 * debug info generation has continued to improve and should be
10002 more reliable under both gdb and lldb.
10003 * rustc has experimental support for compiling in parallel
10004 using the `-C codegen-units` flag.
10005 * rustc no longer encodes rpath information into binaries by
10009 * Stack usage has been optimized with LLVM lifetime annotations.
10010 * Official Rust binaries on Linux are more compatible with older
10011 kernels and distributions, built on CentOS 5.10.
10014 Version 0.11.0 (2014-07-02)
10015 ==========================
10017 * ~1700 changes, numerous bugfixes
10020 * ~[T] has been removed from the language. This type is superseded by
10022 * ~str has been removed from the language. This type is superseded by
10024 * ~T has been removed from the language. This type is superseded by the
10026 * @T has been removed from the language. This type is superseded by the
10027 standard library's std::gc::Gc<T> type.
10028 * Struct fields are now all private by default.
10029 * Vector indices and shift amounts are both required to be a `uint`
10030 instead of any integral type.
10031 * Byte character, byte string, and raw byte string literals are now all
10032 supported by prefixing the normal literal with a `b`.
10033 * Multiple ABIs are no longer allowed in an ABI string
10034 * The syntax for lifetimes on closures/procedures has been tweaked
10035 slightly: `<'a>|A, B|: 'b + K -> T`
10036 * Floating point modulus has been removed from the language; however it
10037 is still provided by a library implementation.
10038 * Private enum variants are now disallowed.
10039 * The `priv` keyword has been removed from the language.
10040 * A closure can no longer be invoked through a &-pointer.
10041 * The `use foo, bar, baz;` syntax has been removed from the language.
10042 * The transmute intrinsic no longer works on type parameters.
10043 * Statics now allow blocks/items in their definition.
10044 * Trait bounds are separated from objects with + instead of : now.
10045 * Objects can no longer be read while they are mutably borrowed.
10046 * The address of a static is now marked as insignificant unless the
10047 #[inline(never)] attribute is placed it.
10048 * The #[unsafe_destructor] attribute is now behind a feature gate.
10049 * Struct literals are no longer allowed in ambiguous positions such as
10050 if, while, match, and for..in.
10051 * Declaration of lang items and intrinsics are now feature-gated by
10053 * Integral literals no longer default to `int`, and floating point
10054 literals no longer default to `f64`. Literals must be suffixed with an
10055 appropriate type if inference cannot determine the type of the
10057 * The Box<T> type is no longer implicitly borrowed to &mut T.
10058 * Procedures are now required to not capture borrowed references.
10061 * The standard library is now a "facade" over a number of underlying
10062 libraries. This means that development on the standard library should
10063 be speedier due to smaller crates, as well as a clearer line between
10065 * A new library, libcore, lives under the standard library's facade
10066 which is Rust's "0-assumption" library, suitable for embedded and
10067 kernel development for example.
10068 * A regex crate has been added to the standard distribution. This crate
10069 includes statically compiled regular expressions.
10070 * The unwrap/unwrap_err methods on Result require a Show bound for
10071 better error messages.
10072 * The return types of the std::comm primitives have been centralized
10073 around the Result type.
10074 * A number of I/O primitives have gained the ability to time out their
10076 * A number of I/O primitives have gained the ability to close their
10077 reading/writing halves to cancel pending operations.
10078 * Reverse iterator methods have been removed in favor of `rev()` on
10079 their forward-iteration counterparts.
10080 * A bitflags! macro has been added to enable easy interop with C and
10081 management of bit flags.
10082 * A debug_assert! macro is now provided which is disabled when
10083 `--cfg ndebug` is passed to the compiler.
10084 * A graphviz crate has been added for creating .dot files.
10085 * The std::cast module has been migrated into std::mem.
10086 * The std::local_data api has been migrated from freestanding functions
10087 to being based on methods.
10088 * The Pod trait has been renamed to Copy.
10089 * jemalloc has been added as the default allocator for types.
10090 * The API for allocating memory has been changed to use proper alignment
10091 and sized deallocation
10092 * Connecting a TcpStream or binding a TcpListener is now based on a
10093 string address and a u16 port. This allows connecting to a hostname as
10095 * The Reader trait now contains a core method, read_at_least(), which
10096 correctly handles many repeated 0-length reads.
10097 * The process-spawning API is now centered around a builder-style
10099 * The :? printing qualifier has been moved from the standard library to
10100 an external libdebug crate.
10101 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10102 have been renamed to Eq/Ord.
10103 * The select/plural methods have been removed from format!. The escapes
10104 for { and } have also changed from \{ and \} to {{ and }},
10106 * The TaskBuilder API has been re-worked to be a true builder, and
10107 extension traits for spawning native/green tasks have been added.
10110 * All breaking changes to the language or libraries now have their
10111 commit message annotated with `[breaking-change]` to allow for easy
10112 discovery of breaking changes.
10113 * The compiler will now try to suggest how to annotate lifetimes if a
10114 lifetime-related error occurs.
10115 * Debug info continues to be improved greatly with general bug fixes and
10116 better support for situations like link time optimization (LTO).
10117 * Usage of syntax extensions when cross-compiling has been fixed.
10118 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10119 -fdata-sections and --gc-sections has been enabled by default
10120 * The compiler is now stricter about where it will load module files
10121 from when a module is declared via `mod foo;`.
10122 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10123 Syntax extensions are now discovered via a "plugin registrar" type
10124 which will be extended in the future to other various plugins.
10125 * Lints have been restructured to allow for dynamically loadable lints.
10126 * A number of rustdoc improvements:
10127 * The HTML output has been visually redesigned.
10128 * Markdown is now powered by hoedown instead of sundown.
10129 * Searching heuristics have been greatly improved.
10130 * The search index has been reduced in size by a great amount.
10131 * Cross-crate documentation via `pub use` has been greatly improved.
10132 * Primitive types are now hyperlinked and documented.
10133 * Documentation has been moved from static.rust-lang.org/doc to
10135 * A new sandbox, play.rust-lang.org, is available for running and
10136 sharing rust code examples on-line.
10137 * Unused attributes are now more robustly warned about.
10138 * The dead_code lint now warns about unused struct fields.
10139 * Cross-compiling to iOS is now supported.
10140 * Cross-compiling to mipsel is now supported.
10141 * Stability attributes are now inherited by default and no longer apply
10142 to intra-crate usage, only inter-crate usage.
10143 * Error message related to non-exhaustive match expressions have been
10147 Version 0.10 (2014-04-03)
10148 =========================
10150 * ~1500 changes, numerous bugfixes
10153 * A new RFC process is now in place for modifying the language.
10154 * Patterns with `@`-pointers have been removed from the language.
10155 * Patterns with unique vectors (`~[T]`) have been removed from the
10157 * Patterns with unique strings (`~str`) have been removed from the
10159 * `@str` has been removed from the language.
10160 * `@[T]` has been removed from the language.
10161 * `@self` has been removed from the language.
10162 * `@Trait` has been removed from the language.
10163 * Headers on `~` allocations which contain `@` boxes inside the type for
10164 reference counting have been removed.
10165 * The semantics around the lifetimes of temporary expressions have changed,
10166 see #3511 and #11585 for more information.
10167 * Cross-crate syntax extensions are now possible, but feature gated. See
10168 #11151 for more information. This includes both `macro_rules!` macros as
10169 well as syntax extensions such as `format!`.
10170 * New lint modes have been added, and older ones have been turned on to be
10172 * Unnecessary parentheses
10173 * Uppercase statics
10175 * Uppercase variables
10176 * Publicly visible private types
10177 * `#[deriving]` with raw pointers
10178 * Unsafe functions can no longer be coerced to closures.
10179 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10180 * The `#[simd]` attribute is now behind a feature gate.
10181 * Visibility is no longer allowed on `extern crate` statements, and
10182 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10183 * Trailing commas are now allowed in argument lists and tuple patterns.
10184 * The `do` keyword has been removed, it is now a reserved keyword.
10185 * Default type parameters have been implemented, but are feature gated.
10186 * Borrowed variables through captures in closures are now considered soundly.
10187 * `extern mod` is now `extern crate`
10188 * The `Freeze` trait has been removed.
10189 * The `Share` trait has been added for types that can be shared among
10191 * Labels in macros are now hygienic.
10192 * Expression/statement macro invocations can be delimited with `{}` now.
10193 * Treatment of types allowed in `static mut` locations has been tweaked.
10194 * The `*` and `.` operators are now overloadable through the `Deref` and
10196 * `~Trait` and `proc` no longer have `Send` bounds by default.
10197 * Partial type hints are now supported with the `_` type marker.
10198 * An `Unsafe` type was introduced for interior mutability. It is now
10199 considered undefined to transmute from `&T` to `&mut T` without using the
10201 * The #[linkage] attribute was implemented for extern statics/functions.
10202 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10203 * `Pod` was renamed to `Copy`.
10206 * The `libextra` library has been removed. It has now been decomposed into
10207 component libraries with smaller and more focused nuggets of
10208 functionality. The full list of libraries can be found on the
10209 documentation index page.
10210 * std: `std::condition` has been removed. All I/O errors are now propagated
10211 through the `Result` type. In order to assist with error handling, a
10212 `try!` macro for unwrapping errors with an early return and a lint for
10213 unused results has been added. See #12039 for more information.
10214 * std: The `vec` module has been renamed to `slice`.
10215 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10216 This will become the only growable vector in the future.
10217 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10218 are now found at `std::io::BufferedReader` instead of
10219 `std::io::buffered::BufferedReader`.
10220 * std: `print` and `println` are no longer in the prelude, the `print!` and
10221 `println!` macros are intended to be used instead.
10222 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10223 attempts to statically prevent cycles.
10224 * std: The standard distribution is adopting the policy of pushing failure
10225 to the user rather than failing in libraries. Many functions (such as
10226 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10227 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10228 deriving mode: `#[deriving(Show)]`.
10229 * std: `ToStr` is now implemented for all types implementing `Show`.
10230 * std: The formatting trait methods now take `&self` instead of `&T`
10231 * std: The `invert()` method on iterators has been renamed to `rev()`
10232 * std: `std::num` has seen a reduction in the genericity of its traits,
10233 consolidating functionality into a few core traits.
10234 * std: Backtraces are now printed on task failure if the environment
10235 variable `RUST_BACKTRACE` is present.
10236 * std: Naming conventions for iterators have been standardized. More details
10237 can be found on the wiki's style guide.
10238 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10239 still implement the function.
10240 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10241 * std: `assert_approx_eq!` has been removed
10242 * std: The `e` and `E` formatting specifiers for floats have been added to
10243 print them in exponential notation.
10244 * std: The `Times` trait has been removed
10245 * std: Indications of variance and opting out of builtin bounds is done
10246 through marker types in `std::kinds::marker` now
10247 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10248 `#[deriving(Hash)]` is now possible.
10249 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10250 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10251 * std: `Chan::new` is now `channel()`.
10252 * std: A new synchronous channel type has been implemented.
10253 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10254 * std: `hashmap` and `trie` have been moved to `libcollections`
10255 * std: `run` has been rolled into `io::process`
10256 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10257 * std: The equality and comparison traits have seen some reorganization.
10258 * std: `rand` has moved to `librand`.
10259 * std: `to_{lower,upper}case` has been implemented for `char`.
10260 * std: Logging has been moved to `liblog`.
10261 * collections: `HashMap` has been rewritten for higher performance and less
10263 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10264 it can be booted manually. The runtime guide has more information and
10266 * native: All I/O functionality except signals has been implemented.
10267 * green: Task spawning with `libgreen` has been optimized with stack caching
10268 and various trimming of code.
10269 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10270 * sync: The `extra::sync` module has been updated to modern rust (and moved
10271 to the `sync` library), tweaking and improving various interfaces while
10272 dropping redundant functionality.
10273 * sync: A new `Barrier` type has been added to the `sync` library.
10274 * sync: An efficient mutex for native and green tasks has been implemented.
10275 * serialize: The `base64` module has seen some improvement. It treats
10276 newlines better, has non-string error values, and has seen general
10278 * fourcc: A `fourcc!` macro was introduced
10279 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10280 hexadecimal literal.
10283 * `rustpkg` has been deprecated and removed from the main repository. Its
10284 replacement, `cargo`, is under development.
10285 * Nightly builds of rust are now available
10286 * The memory usage of rustc has been improved many times throughout this
10288 * The build process supports disabling rpath support for the rustc binary
10290 * Code generation has improved in some cases, giving more information to the
10291 LLVM optimization passes to enable more extensive optimizations.
10292 * Debuginfo compatibility with lldb on OSX has been restored.
10293 * The master branch is now gated on an android bot, making building for
10294 android much more reliable.
10295 * Output flags have been centralized into one `--emit` flag.
10296 * Crate type flags have been centralized into one `--crate-type` flag.
10297 * Codegen flags have been consolidated behind a `-C` flag.
10298 * Linking against outdated crates now has improved error messages.
10299 * Error messages with lifetimes will often suggest how to annotate the
10300 function to fix the error.
10301 * Many more types are documented in the standard library, and new guides
10303 * Many `rustdoc` improvements:
10304 * code blocks are syntax highlighted.
10305 * render standalone markdown files.
10306 * the --test flag tests all code blocks by default.
10307 * exported macros are displayed.
10308 * re-exported types have their documentation inlined at the location of the
10310 * search works across crates that have been rendered to the same output
10314 Version 0.9 (2014-01-09)
10315 ==========================
10317 * ~1800 changes, numerous bugfixes
10320 * The `float` type has been removed. Use `f32` or `f64` instead.
10321 * A new facility for enabling experimental features (feature gating) has
10322 been added, using the crate-level `#[feature(foo)]` attribute.
10323 * Managed boxes (@) are now behind a feature gate
10324 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10325 standard library's `Gc` or `Rc` types instead.
10326 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10327 * Jumping back to the top of a loop is now done with `continue` instead of
10329 * Strings can no longer be mutated through index assignment.
10330 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10331 hash delimiters, as in `r###"foo"###`.
10332 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10334 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10335 * `@fn`s have been removed.
10336 * `do` only works with procs in order to make it obvious what the cost
10338 * Single-element tuple-like structs can no longer be dereferenced to
10339 obtain the inner value. A more comprehensive solution for overloading
10340 the dereference operator will be provided in the future.
10341 * The `#[link(...)]` attribute has been replaced with
10342 `#[crate_id = "name#vers"]`.
10343 * Empty `impl`s must be terminated with empty braces and may not be
10344 terminated with a semicolon.
10345 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10346 no longer has any special meaning.
10347 * The old `fmt!` string formatting macro has been removed.
10348 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10349 `print!` and `println!`.
10350 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10351 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10352 `extern mod foo = "bar"` instead.
10353 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10354 * Macros can have attributes.
10355 * Macros can expand to items with attributes.
10356 * Macros can expand to multiple items.
10357 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10358 * Comments may be nested.
10359 * Values automatically coerce to trait objects they implement, without
10361 * Enum discriminants are no longer an entire word but as small as needed to
10362 contain all the variants. The `repr` attribute can be used to override
10363 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10364 `#[repr(C)]` to match C enums.
10365 * Non-string literals are not allowed in attributes (they never worked).
10366 * The FFI now supports variadic functions.
10367 * Octal numeric literals, as in `0o7777`.
10368 * The `concat!` syntax extension performs compile-time string concatenation.
10369 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10370 removed as Rust no longer uses segmented stacks.
10371 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10372 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10373 not `*`; ignoring remaining fields of a struct is also done with `..`,
10374 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10375 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10376 * `rustc` supports the "system" calling convention, which defaults to the
10377 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10379 * The `type_overflow` lint (default: warn) checks literals for overflow.
10380 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10381 * The `attribute_usage` lint (default: warn) warns about unknown
10383 * The `unknown_features` lint (default: warn) warns about unknown
10385 * The `dead_code` lint (default: warn) checks for dead code.
10386 * Rust libraries can be linked statically to one another
10387 * `#[link_args]` is behind the `link_args` feature gate.
10388 * Native libraries are now linked with `#[link(name = "foo")]`
10389 * Native libraries can be statically linked to a rust crate
10390 (`#[link(name = "foo", kind = "static")]`).
10391 * Native OS X frameworks are now officially supported
10392 (`#[link(name = "foo", kind = "framework")]`).
10393 * The `#[thread_local]` attribute creates thread-local (not task-local)
10394 variables. Currently behind the `thread_local` feature gate.
10395 * The `return` keyword may be used in closures.
10396 * Types that can be copied via a memcpy implement the `Pod` kind.
10397 * The `cfg` attribute can now be used on struct fields and enum variants.
10400 * std: The `option` and `result` API's have been overhauled to make them
10401 simpler, more consistent, and more composable.
10402 * std: The entire `std::io` module has been replaced with one that is
10403 more comprehensive and that properly interfaces with the underlying
10404 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10406 * std: `io::util` contains a number of useful implementations of
10407 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10408 `ZeroReader`, `TeeReader`.
10409 * std: The reference counted pointer type `extra::rc` moved into std.
10410 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10411 just a wrapper around it).
10412 * std: The `Either` type has been removed.
10413 * std: `fmt::Default` can be implemented for any type to provide default
10414 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10415 * std: The `rand` API continues to be tweaked.
10416 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10417 on failure in gdb, is now named `rust_fail`.
10418 * std: The `each_key` and `each_value` methods on `HashMap` have been
10419 replaced by the `keys` and `values` iterators.
10420 * std: Functions dealing with type size and alignment have moved from the
10421 `sys` module to the `mem` module.
10422 * std: The `path` module was written and API changed.
10423 * std: `str::from_utf8` has been changed to cast instead of allocate.
10424 * std: `starts_with` and `ends_with` methods added to vectors via the
10425 `ImmutableEqVector` trait, which is in the prelude.
10426 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10427 if the index is out of bounds.
10428 * std: Task failure no longer propagates between tasks, as the model was
10429 complex, expensive, and incompatible with thread-based tasks.
10430 * std: The `Any` type can be used for dynamic typing.
10431 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10433 * std: Methods that produce iterators generally do not have an `_iter`
10435 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10436 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10437 * std: `util::ignore` renamed to `prelude::drop`.
10438 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10440 * std: `vec::raw` has seen a lot of cleanup and API changes.
10441 * std: The standard library no longer includes any C++ code, and very
10442 minimal C, eliminating the dependency on libstdc++.
10443 * std: Runtime scheduling and I/O functionality has been factored out into
10444 extensible interfaces and is now implemented by two different crates:
10445 libnative, for native threading and I/O; and libgreen, for green threading
10446 and I/O. This paves the way for using the standard library in more limited
10447 embedded environments.
10448 * std: The `comm` module has been rewritten to be much faster, have a
10449 simpler, more consistent API, and to work for both native and green
10451 * std: All libuv dependencies have been moved into the rustuv crate.
10452 * native: New implementations of runtime scheduling on top of OS threads.
10453 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10455 * green: The green thread scheduler and message passing types are almost
10456 entirely lock-free.
10457 * extra: The `flatpipes` module had bitrotted and was removed.
10458 * extra: All crypto functions have been removed and Rust now has a policy of
10459 not reimplementing crypto in the standard library. In the future crypto
10460 will be provided by external crates with bindings to established libraries.
10461 * extra: `c_vec` has been modernized.
10462 * extra: The `sort` module has been removed. Use the `sort` method on
10466 * The `rust` and `rusti` commands have been removed, due to lack of
10468 * `rustdoc` was completely rewritten.
10469 * `rustdoc` can test code examples in documentation.
10470 * `rustpkg` can test packages with the argument, 'test'.
10471 * `rustpkg` supports arbitrary dependencies, including C libraries.
10472 * `rustc`'s support for generating debug info is improved again.
10473 * `rustc` has better error reporting for unbalanced delimiters.
10474 * `rustc`'s JIT support was removed due to bitrot.
10475 * Executables and static libraries can be built with LTO (-Z lto)
10476 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10480 Version 0.8 (2013-09-26)
10481 ============================
10483 * ~2200 changes, numerous bugfixes
10486 * The `for` loop syntax has changed to work with the `Iterator` trait.
10487 * At long last, unwinding works on Windows.
10488 * Default methods are ready for use.
10489 * Many trait inheritance bugs fixed.
10490 * Owned and borrowed trait objects work more reliably.
10491 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10492 * rustc can omit emission of code for the `debug!` macro if it is passed
10494 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10495 for foo.rs, then foo/mod.rs, and will generate an error when both are
10497 * Strings no longer contain trailing nulls. The new `std::c_str` module
10498 provides new mechanisms for converting to C strings.
10499 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10500 * The FFI has been overhauled such that foreign functions are called directly,
10501 instead of through a stack-switching wrapper.
10502 * Calling a foreign function must be done through a Rust function with the
10503 `#[fixed_stack_segment]` attribute.
10504 * The `externfn!` macro can be used to declare both a foreign function and
10505 a `#[fixed_stack_segment]` wrapper at once.
10506 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10507 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10508 * `priv` is disallowed everywhere except for struct fields and enum variants.
10509 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10510 * `ref` bindings in irrefutable patterns work correctly now.
10511 * `char` is now prevented from containing invalid code points.
10512 * Casting to `bool` is no longer allowed.
10513 * `\0` is now accepted as an escape in chars and strings.
10514 * `yield` is a reserved keyword.
10515 * `typeof` is a reserved keyword.
10516 * Crates may be imported by URL with `extern mod foo = "url";`.
10517 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10518 * Static vectors can be initialized with repeating elements,
10519 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10520 * Static structs can be initialized with functional record update,
10521 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10522 * `cfg!` can be used to conditionally execute code based on the crate
10523 configuration, similarly to `#[cfg(...)]`.
10524 * The `unnecessary_qualification` lint detects unneeded module
10525 prefixes (default: allow).
10526 * Arithmetic operations have been implemented on the SIMD types in
10527 `std::unstable::simd`.
10528 * Exchange allocation headers were removed, reducing memory usage.
10529 * `format!` implements a completely new, extensible, and higher-performance
10530 string formatting system. It will replace `fmt!`.
10531 * `print!` and `println!` write formatted strings (using the `format!`
10532 extension) to stdout.
10533 * `write!` and `writeln!` write formatted strings (using the `format!`
10534 extension) to the new Writers in `std::rt::io`.
10535 * The library section in which a function or static is placed may
10536 be specified with `#[link_section = "..."]`.
10537 * The `proto!` syntax extension for defining bounded message protocols
10539 * `macro_rules!` is hygienic for `let` declarations.
10540 * The `#[export_name]` attribute specifies the name of a symbol.
10541 * `unreachable!` can be used to indicate unreachable code, and fails
10545 * std: Transitioned to the new runtime, written in Rust.
10546 * std: Added an experimental I/O library, `rt::io`, based on the new
10548 * std: A new generic `range` function was added to the prelude, replacing
10549 `uint::range` and friends.
10550 * std: `range_rev` no longer exists. Since range is an iterator it can be
10551 reversed with `range(lo, hi).invert()`.
10552 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10553 renamed to `unwrap_or`.
10554 * std: The `iterator` module was renamed to `iter`.
10555 * std: Integral types now support the `checked_add`, `checked_sub`, and
10556 `checked_mul` operations for detecting overflow.
10557 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10559 * std: Methods are standardizing on conventions for casting methods:
10560 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10562 * std: The `CString` type in `c_str` provides new ways to convert to and
10564 * std: `DoubleEndedIterator` can yield elements in two directions.
10565 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10567 * std: `str::from_bytes` renamed to `str::from_utf8`.
10568 * std: `pop_opt` and `shift_opt` methods added to vectors.
10569 * std: The task-local data interface no longer uses @, and keys are
10570 no longer function pointers.
10571 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10572 * std: Added `SharedPort` to `comm`.
10573 * std: `Eq` has a default method for `ne`; only `eq` is required
10574 in implementations.
10575 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10576 is required in implementations.
10577 * std: `is_utf8` performance is improved, impacting many string functions.
10578 * std: `os::MemoryMap` provides cross-platform mmap.
10579 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10580 are not 'in-bounds' are considered undefined.
10581 * std: Many freestanding functions in `vec` removed in favor of methods.
10582 * std: Many freestanding functions on scalar types removed in favor of
10584 * std: Many options to task builders were removed since they don't make
10585 sense in the new scheduler design.
10586 * std: More containers implement `FromIterator` so can be created by the
10588 * std: More complete atomic types in `unstable::atomics`.
10589 * std: `comm::PortSet` removed.
10590 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10591 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10592 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10593 default implementations.
10594 * std: Various `from_str` functions were removed in favor of a generic
10595 `from_str` which is available in the prelude.
10596 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10597 * extra: `dlist`, the doubly-linked list was modernized.
10598 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10599 * extra: Added `glob` module, replacing `std::os::glob`.
10600 * extra: `rope` was removed.
10601 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10602 * extra: `net`, and `timer` were removed. The experimental replacements
10603 are `std::rt::io::net` and `std::rt::io::timer`.
10604 * extra: Iterators implemented for `SmallIntMap`.
10605 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10606 * extra: `SmallIntSet` removed. Use `BitvSet`.
10607 * extra: Performance of JSON parsing greatly improved.
10608 * extra: `semver` updated to SemVer 2.0.0.
10609 * extra: `term` handles more terminals correctly.
10610 * extra: `dbg` module removed.
10611 * extra: `par` module removed.
10612 * extra: `future` was cleaned up, with some method renames.
10613 * extra: Most free functions in `getopts` were converted to methods.
10616 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10617 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10618 similarly to gcc's `--march` flag.
10619 * rustc's performance compiling small crates is much better.
10620 * rustpkg has received many improvements.
10621 * rustpkg supports git tags as package IDs.
10622 * rustpkg builds into target-specific directories so it can be used for
10624 * The number of concurrent test tasks is controlled by the environment
10625 variable RUST_TEST_TASKS.
10626 * The test harness can now report metrics for benchmarks.
10627 * All tools have man pages.
10628 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10629 * The runtime uses jemalloc for allocations.
10630 * Segmented stacks are temporarily disabled as part of the transition to
10631 the new runtime. Stack overflows are possible!
10632 * A new documentation backend, rustdoc_ng, is available for use. It is
10633 still invoked through the normal `rustdoc` command.
10636 Version 0.7 (2013-07-03)
10637 =======================
10639 * ~2000 changes, numerous bugfixes
10642 * `impl`s no longer accept a visibility qualifier. Put them on methods
10644 * The borrow checker has been rewritten with flow-sensitivity, fixing
10645 many bugs and inconveniences.
10646 * The `self` parameter no longer implicitly means `&'self self`,
10647 and can be explicitly marked with a lifetime.
10648 * Overloadable compound operators (`+=`, etc.) have been temporarily
10649 removed due to bugs.
10650 * The `for` loop protocol now requires `for`-iterators to return `bool`
10651 so they compose better.
10652 * The `Durable` trait is replaced with the `'static` bounds.
10653 * Trait default methods work more often.
10654 * Structs with the `#[packed]` attribute have byte alignment and
10655 no padding between fields.
10656 * Type parameters bound by `Copy` must now be copied explicitly with
10657 the `copy` keyword.
10658 * It is now illegal to move out of a dereferenced unsafe pointer.
10659 * `Option<~T>` is now represented as a nullable pointer.
10660 * `@mut` does dynamic borrow checks correctly.
10661 * The `main` function is only detected at the topmost level of the crate.
10662 The `#[main]` attribute is still valid anywhere.
10663 * Struct fields may no longer be mutable. Use inherited mutability.
10664 * The `#[no_send]` attribute makes a type that would otherwise be
10666 * The `#[no_freeze]` attribute makes a type that would otherwise be
10668 * Unbounded recursion will abort the process after reaching the limit
10669 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10670 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10671 are never implicitly copyable.
10672 * `#[static_assert]` makes compile-time assertions about static bools.
10673 * At long last, 'argument modes' no longer exist.
10674 * The rarely used `use mod` statement no longer exists.
10676 * Syntax extensions
10677 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10679 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10680 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10681 `#[deriving(...)]`.
10682 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10683 and unsuffixed integer literals.
10686 * The `core` crate was renamed to `std`.
10687 * The `std` crate was renamed to `extra`.
10688 * More and improved documentation.
10689 * std: `iterator` module for external iterator objects.
10690 * Many old-style (internal, higher-order function) iterators replaced by
10691 implementations of `Iterator`.
10692 * std: Many old internal vector and string iterators,
10693 incl. `any`, `all`. removed.
10694 * std: The `finalize` method of `Drop` renamed to `drop`.
10695 * std: The `drop` method now takes `&mut self` instead of `&self`.
10696 * std: The prelude no longer re-exports any modules, only types and traits.
10697 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10698 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10699 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10700 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10701 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10702 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10703 * std: Many types implement `Clone`.
10704 * std: `path` type renamed to `Path`.
10705 * std: `mut` module and `Mut` type removed.
10706 * std: Many standalone functions removed in favor of methods and iterators
10707 in `vec`, `str`. In the future methods will also work as functions.
10708 * std: `reinterpret_cast` removed. Use `transmute`.
10709 * std: ascii string handling in `std::ascii`.
10710 * std: `Rand` is implemented for ~/@.
10711 * std: `run` module for spawning processes overhauled.
10712 * std: Various atomic types added to `unstable::atomic`.
10713 * std: Various types implement `Zero`.
10714 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10715 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10716 * std: Added `os::mkdir_recursive`.
10717 * std: Added `os::glob` function performs filesystems globs.
10718 * std: `FuzzyEq` renamed to `ApproxEq`.
10719 * std: `Map` now defines `pop` and `swap` methods.
10720 * std: `Cell` constructors converted to static methods.
10721 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10722 * extra: `flate` module moved from `std` to `extra`.
10723 * extra: `fileinput` module for iterating over a series of files.
10724 * extra: `Complex` number type and `complex` module.
10725 * extra: `Rational` number type and `rational` module.
10726 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10727 * extra: `term` uses terminfo now, is more correct.
10728 * extra: `arc` functions converted to methods.
10729 * extra: Implementation of fixed output size variations of SHA-2.
10732 * `unused_variables` lint mode for unused variables (default: warn).
10733 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10735 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10737 * `dead_assignment` lint mode for unread variables (default: warn).
10738 * `unnecessary_allocation` lint mode detects some heap allocations that are
10739 immediately borrowed so could be written without allocating (default: warn).
10740 * `missing_doc` lint mode (default: allow).
10741 * `unreachable_code` lint mode (default: warn).
10742 * The `rusti` command has been rewritten and a number of bugs addressed.
10743 * rustc outputs in color on more terminals.
10744 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10745 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10746 * Compiling with `-g` will make the binary record information about
10747 dynamic borrowcheck failures for debugging.
10748 * rustdoc has a nicer stylesheet.
10749 * Various improvements to rustdoc.
10750 * Improvements to rustpkg (see the detailed release notes).
10753 Version 0.6 (2013-04-03)
10754 ========================
10756 * ~2100 changes, numerous bugfixes
10759 * The self type parameter in traits is now spelled `Self`
10760 * The `self` parameter in trait and impl methods must now be explicitly
10761 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10762 * Static methods no longer require the `static` keyword and instead
10763 are distinguished by the lack of a `self` parameter
10764 * Replaced the `Durable` trait with the `'static` lifetime
10765 * The old closure type syntax with the trailing sigil has been
10766 removed in favor of the more consistent leading sigil
10767 * `super` is a keyword, and may be prefixed to paths
10768 * Trait bounds are separated with `+` instead of whitespace
10769 * Traits are implemented with `impl Trait for Type`
10770 instead of `impl Type: Trait`
10771 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10772 * The `export` keyword has finally been removed
10773 * The `move` keyword has been removed (see "Semantic changes")
10774 * The interior mutability qualifier on vectors, `[mut T]`, has been
10775 removed. Use `&mut [T]`, etc.
10776 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10777 * `fail` is no longer a keyword. Use `fail!()`
10778 * `assert` is no longer a keyword. Use `assert!()`
10779 * `log` is no longer a keyword. use `debug!`, etc.
10780 * 1-tuples may be represented as `(T,)`
10781 * Struct fields may no longer be `mut`. Use inherited mutability,
10782 `@mut T`, `core::mut` or `core::cell`
10783 * `extern mod { ... }` is no longer valid syntax for foreign
10784 function modules. Use extern blocks: `extern { ... }`
10785 * Newtype enums removed. Use tuple-structs.
10786 * Trait implementations no longer support visibility modifiers
10787 * Pattern matching over vectors improved and expanded
10788 * `const` renamed to `static` to correspond to lifetime name,
10789 and make room for future `static mut` unsafe mutable globals.
10790 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10791 * `Clone` implementations can be automatically generated with
10792 `#[deriving(Clone)]`
10793 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10794 instead of `foo as Bar`.
10795 * Fixed length vector types are now written as `[int, .. 3]`
10796 instead of `[int * 3]`.
10797 * Fixed length vector types can express the length as a constant
10798 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10801 * Types with owned pointers or custom destructors move by default,
10802 eliminating the `move` keyword
10803 * All foreign functions are considered unsafe
10804 * &mut is now unaliasable
10805 * Writes to borrowed @mut pointers are prevented dynamically
10807 * The name of the main function can be customized using #[main]
10808 * The default type of an inferred closure is &fn instead of @fn
10809 * `use` statements may no longer be "chained" - they cannot import
10810 identifiers imported by previous `use` statements
10811 * `use` statements are crate relative, importing from the "top"
10812 of the crate by default. Paths may be prefixed with `super::`
10813 or `self::` to change the search behavior.
10814 * Method visibility is inherited from the implementation declaration
10815 * Structural records have been removed
10816 * Many more types can be used in static items, including enums
10817 'static-lifetime pointers and vectors
10818 * Pattern matching over vectors improved and expanded
10819 * Typechecking of closure types has been overhauled to
10820 improve inference and eliminate unsoundness
10821 * Macros leave scope at the end of modules, unless that module is
10822 tagged with #[macro_escape]
10825 * Added big integers to `std::bigint`
10826 * Removed `core::oldcomm` module
10827 * Added pipe-based `core::comm` module
10828 * Numeric traits have been reorganized under `core::num`
10829 * `vec::slice` finally returns a slice
10830 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10831 * Containers reorganized around traits in `core::container`
10832 * `core::dvec` removed, `~[T]` is a drop-in replacement
10833 * `core::send_map` renamed to `core::hashmap`
10834 * `std::map` removed; replaced with `core::hashmap`
10835 * `std::treemap` reimplemented as an owned balanced tree
10836 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10837 * `core::trie` added as a fast ordered map for integer keys
10838 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10839 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10840 overload the comparison operators, whereas `TotalOrd` is used
10841 by certain container types
10844 * Replaced the 'cargo' package manager with 'rustpkg'
10845 * Added all-purpose 'rust' tool
10846 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10847 * rustc now *attempts* to offer spelling suggestions
10848 * Improved support for ARM and Android
10849 * Preliminary MIPS backend
10850 * Improved foreign function ABI implementation for x86, x86_64
10851 * Various memory usage improvements
10852 * Rust code may be embedded in foreign code under limited circumstances
10853 * Inline assembler supported by new asm!() syntax extension.
10856 Version 0.5 (2012-12-21)
10857 ===========================
10859 * ~900 changes, numerous bugfixes
10862 * Removed `<-` move operator
10863 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10864 * Removed old fixed length vector syntax - `[T]/N`
10865 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10866 * Macros may now expand to items and statements
10867 * `a.b()` is always parsed as a method call, never as a field projection
10868 * `Eq` and `IterBytes` implementations can be automatically generated
10869 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10870 * Removed the special crate language for `.rc` files
10871 * Function arguments may consist of any irrefutable pattern
10874 * `&` and `~` pointers may point to objects
10875 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10876 * Enum variants may be structs
10877 * Destructors can be added to all nominal types with the Drop trait
10878 * Structs and nullary enum variants may be constants
10879 * Values that cannot be implicitly copied are now automatically moved
10880 without writing `move` explicitly
10881 * `&T` may now be coerced to `*T`
10882 * Coercions happen in `let` statements as well as function calls
10883 * `use` statements now take crate-relative paths
10884 * The module and type namespaces have been merged so that static
10885 method names can be resolved under the trait in which they are
10888 * Improved support for language features
10889 * Trait inheritance works in many scenarios
10890 * More support for explicit self arguments in methods - `self`, `&self`
10891 `@self`, and `~self` all generally work as expected
10892 * Static methods work in more situations
10893 * Experimental: Traits may declare default methods for the implementations
10897 * New condition handling system in `core::condition`
10898 * Timsort added to `std::sort`
10899 * New priority queue, `std::priority_queue`
10900 * Pipes for serializable types, `std::flatpipes'
10901 * Serialization overhauled to be trait-based
10902 * Expanded `getopts` definitions
10903 * Moved futures to `std`
10904 * More functions are pure now
10905 * `core::comm` renamed to `oldcomm`. Still deprecated
10906 * `rustdoc` and `cargo` are libraries now
10909 * Added a preliminary REPL, `rusti`
10910 * License changed from MIT to dual MIT/APL2
10913 Version 0.4 (2012-10-15)
10914 ==========================
10916 * ~2000 changes, numerous bugfixes
10919 * All keywords are now strict and may not be used as identifiers anywhere
10920 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10921 'of', 'with', 'to', 'class'.
10922 * Classes are replaced with simpler structs
10923 * Explicit method self types
10924 * `ret` became `return` and `alt` became `match`
10925 * `import` is now `use`; `use is now `extern mod`
10926 * `extern mod { ... }` is now `extern { ... }`
10927 * `use mod` is the recommended way to import modules
10928 * `pub` and `priv` replace deprecated export lists
10929 * The syntax of `match` pattern arms now uses fat arrow (=>)
10930 * `main` no longer accepts an args vector; use `os::args` instead
10933 * Trait implementations are now coherent, ala Haskell typeclasses
10934 * Trait methods may be static
10935 * Argument modes are deprecated
10936 * Borrowed pointers are much more mature and recommended for use
10937 * Strings and vectors in the static region are stored in constant memory
10938 * Typestate was removed
10939 * Resolution rewritten to be more reliable
10940 * Support for 'dual-mode' data structures (freezing and thawing)
10943 * Most binary operators can now be overloaded via the traits in
10945 * `std::net::url` for representing URLs
10946 * Sendable hash maps in `core::send_map`
10947 * `core::task' gained a (currently unsafe) task-local storage API
10950 * An efficient new intertask communication primitive called the pipe,
10951 along with a number of higher-level channel types, in `core::pipes`
10952 * `std::arc`, an atomically reference counted, immutable, shared memory
10954 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10955 * Futures are now based on pipes and sendable
10956 * More robust linked task failure
10957 * Improved task builder API
10960 * Improved error reporting
10961 * Preliminary JIT support
10962 * Preliminary work on precise GC
10963 * Extensive architectural improvements to rustc
10964 * Begun a transition away from buggy C++-based reflection (shape) code to
10965 Rust-based (visitor) code
10966 * All hash functions and tables converted to secure, randomized SipHash
10969 Version 0.3 (2012-07-12)
10970 ========================
10972 * ~1900 changes, numerous bugfixes
10974 * New coding conveniences
10975 * Integer-literal suffix inference
10976 * Per-item control over warnings, errors
10977 * #[cfg(windows)] and #[cfg(unix)] attributes
10978 * Documentation comments
10979 * More compact closure syntax
10980 * 'do' expressions for treating higher-order functions as
10982 * *-patterns (wildcard extended to all constructor fields)
10985 * Name resolution pass and exhaustiveness checker rewritten
10986 * Region pointers and borrow checking supersede alias
10988 * Init-ness checking is now provided by a region-based liveness
10989 pass instead of the typestate pass; same for last-use analysis
10990 * Extensive work on region pointers
10992 * Experimental new language features
10993 * Slices and fixed-size, interior-allocated vectors
10994 * #!-comments for lang versioning, shell execution
10995 * Destructors and iface implementation for classes;
10996 type-parameterized classes and class methods
10997 * 'const' type kind for types that can be used to implement
10998 shared-memory concurrency patterns
11002 * Removal of various obsolete features
11003 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11004 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11006 * Constructs: do-while loops ('do' repurposed), fn binding,
11007 resources (replaced by destructors)
11009 * Compiler reorganization
11010 * Syntax-layer of compiler split into separate crate
11011 * Clang (from LLVM project) integrated into build
11012 * Typechecker split into sub-modules
11015 * New time functions
11016 * Extension methods for many built-in types
11017 * Arc: atomic-refcount read-only / exclusive-use shared cells
11018 * Par: parallel map and search routines
11019 * Extensive work on libuv interface
11020 * Much vector code moved to libraries
11021 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11022 #include, #include_str, #include_bin
11024 * Tool improvements
11025 * Cargo automatically resolves dependencies
11028 Version 0.2 (2012-03-29)
11029 =========================
11031 * >1500 changes, numerous bugfixes
11033 * New docs and doc tooling
11035 * New port: FreeBSD x86_64
11037 * Compilation model enhancements
11038 * Generics now specialized, multiply instantiated
11039 * Functions now inlined across separate crates
11041 * Scheduling, stack and threading fixes
11042 * Noticeably improved message-passing performance
11043 * Explicit schedulers
11047 * Experimental new language features
11048 * Operator overloading
11052 * Various language extensions
11053 * C-callback function types: 'crust fn ...'
11054 * Infinite-loop construct: 'loop { ... }'
11055 * Shorten 'mutable' to 'mut'
11056 * Required mutable-local qualifier: 'let mut ...'
11057 * Basic glob-exporting: 'export foo::*;'
11058 * Alt now exhaustive, 'alt check' for runtime-checked
11059 * Block-function form of 'for' loop, with 'break' and 'ret'.
11062 * AST quasi-quote syntax extension
11063 * Revived libuv interface
11064 * New modules: core::{future, iter}, std::arena
11065 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11066 * Extensive cleanup, regularization in libstd, libcore
11069 Version 0.1 (2012-01-20)
11070 ===============================
11072 * Most language features work, including:
11073 * Unique pointers, unique closures, move semantics
11074 * Interface-constrained generics
11075 * Static interface dispatch
11077 * Multithread task scheduling
11078 * Typestate predicates
11079 * Failure unwinding, destructors
11080 * Pattern matching and destructuring assignment
11081 * Lightweight block-lambda syntax
11082 * Preliminary macro-by-example
11084 * Compiler works with the following configurations:
11085 * Linux: x86 and x86_64 hosts and targets
11086 * macOS: x86 and x86_64 hosts and targets
11087 * Windows: x86 hosts and targets
11089 * Cross compilation / multi-target configuration supported.
11091 * Preliminary API-documentation and package-management tools included.
11095 * Documentation is incomplete.
11097 * Performance is below intended target.
11099 * Standard library APIs are subject to extensive change, reorganization.
11101 * Language-level versioning is not yet operational - future code will
11102 break unexpectedly.