1 Version 1.49.0 (2020-12-31)
2 ============================
5 -----------------------
7 - [Unions can now implement `Drop`, and you can now have a field in a union
8 with `ManuallyDrop<T>`.][77547]
9 - [You can now cast uninhabited enums to integers.][76199]
10 - [You can now bind by reference and by move in patterns.][76119] This
11 allows you to selectively borrow individual components of a type. E.g.
20 name: String::from("Alice"),
24 // `name` is moved out of person, but `age` is referenced.
25 let Person { name, ref age } = person;
26 println!("{} {}", name, age);
30 -----------------------
32 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
33 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
34 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
35 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
36 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
37 - [Output from threads spawned in tests is now captured.][78227]
38 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
40 \* Refer to Rust's [platform support page][forge-platform-support] for more
41 information on Rust's tiered platform support.
44 -----------------------
46 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
47 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
52 - [`slice::select_nth_unstable`]
53 - [`slice::select_nth_unstable_by`]
54 - [`slice::select_nth_unstable_by_key`]
56 The following previously stable methods are now `const`.
59 - [`Poll::is_pending`]
62 -----------------------
63 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
64 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
65 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
66 variable will be set if the crate being built is one the user selected to build, either
67 with `-p` or through defaults.
68 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
74 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
75 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
76 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
77 Previously such invalid or unused attributes could be ignored.
78 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
79 read [this post about the changes][rustdoc-ws-post] for more details.
80 - [Trait bounds are no longer inferred for associated types.][79904]
84 These changes provide no direct user facing benefits, but represent significant
85 improvements to the internals and overall performance of rustc and
88 - [rustc's internal crates are now compiled using the `initial-exec` Thread
89 Local Storage model.][78201]
90 - [Calculate visibilities once in resolve.][78077]
91 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
92 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
95 [75991]: https://github.com/rust-lang/rust/pull/75991
96 [78951]: https://github.com/rust-lang/rust/pull/78951
97 [78848]: https://github.com/rust-lang/rust/pull/78848
98 [78746]: https://github.com/rust-lang/rust/pull/78746
99 [78376]: https://github.com/rust-lang/rust/pull/78376
100 [78228]: https://github.com/rust-lang/rust/pull/78228
101 [78227]: https://github.com/rust-lang/rust/pull/78227
102 [78201]: https://github.com/rust-lang/rust/pull/78201
103 [78109]: https://github.com/rust-lang/rust/pull/78109
104 [78077]: https://github.com/rust-lang/rust/pull/78077
105 [77997]: https://github.com/rust-lang/rust/pull/77997
106 [77703]: https://github.com/rust-lang/rust/pull/77703
107 [77547]: https://github.com/rust-lang/rust/pull/77547
108 [77015]: https://github.com/rust-lang/rust/pull/77015
109 [76199]: https://github.com/rust-lang/rust/pull/76199
110 [76119]: https://github.com/rust-lang/rust/pull/76119
111 [75914]: https://github.com/rust-lang/rust/pull/75914
112 [79004]: https://github.com/rust-lang/rust/pull/79004
113 [78676]: https://github.com/rust-lang/rust/pull/78676
114 [79904]: https://github.com/rust-lang/rust/issues/79904
115 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
116 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
117 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
118 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
119 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
120 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
121 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
122 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
123 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
124 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
125 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
127 Version 1.48.0 (2020-11-19)
128 ==========================
133 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
134 is still rejected *semantically*, but can now be parsed by procedural macros.
138 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
139 `rustc` whether to link its own C runtime and libraries or to rely on a external
140 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
141 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
142 Note: If you're using cargo you must explicitly pass the `--target` flag.
143 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
145 \* Refer to Rust's [platform support page][forge-platform-support] for more
146 information on Rust's tiered platform support.
150 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
151 and `&Stderr`.][76275]
152 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
153 - [The `matches!` macro now supports having a trailing comma.][74880]
154 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
155 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
159 - [`slice::as_ptr_range`]
160 - [`slice::as_mut_ptr_range`]
161 - [`VecDeque::make_contiguous`]
162 - [`future::pending`]
165 The following previously stable methods are now `const fn`'s:
167 - [`Option::is_some`]
168 - [`Option::is_none`]
173 - [`Ordering::reverse`]
181 - [You can now link to items in `rustdoc` using the intra-doc link
182 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
183 a link to `std::future`'s documentation. See ["Linking to items by
184 name"][intradoc-links] for more information.
185 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
186 when searching through `rustdoc`'s UI.][75740]
190 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
191 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
192 promoted to `'static` lifetime any more inside `const fn`s.
193 - [Associated type bindings on trait objects are now verified to meet the bounds
194 declared on the trait when checking that they implement the trait.][27675]
195 - [When trait bounds on associated types or opaque types are ambiguous, the
196 compiler no longer makes an arbitrary choice on which bound to use.][54121]
197 - [Fixed recursive nonterminals not being expanded in macros during
198 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
199 correctly handling recursive nonterminal tokens.
200 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
201 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
202 in places where they have no effect.][73461]
203 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
204 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
205 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
206 disallow zero-initialization.][71274]
207 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
208 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
209 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
210 see the [`catch_unwind`] documentation for further information.
216 These changes provide no direct user facing benefits, but represent significant
217 improvements to the internals and overall performance of rustc and
220 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
221 You can continue building with `make` by setting `ninja=false` in
223 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
224 - [Made `ensure_sufficient_stack()` non-generic][76680]
226 [78143]: https://github.com/rust-lang/rust/issues/78143
227 [76680]: https://github.com/rust-lang/rust/pull/76680/
228 [76030]: https://github.com/rust-lang/rust/pull/76030/
229 [70212]: https://github.com/rust-lang/rust/pull/70212/
230 [27675]: https://github.com/rust-lang/rust/issues/27675/
231 [54121]: https://github.com/rust-lang/rust/issues/54121/
232 [71274]: https://github.com/rust-lang/rust/pull/71274/
233 [77386]: https://github.com/rust-lang/rust/pull/77386/
234 [77153]: https://github.com/rust-lang/rust/pull/77153/
235 [77055]: https://github.com/rust-lang/rust/pull/77055/
236 [76275]: https://github.com/rust-lang/rust/pull/76275/
237 [76310]: https://github.com/rust-lang/rust/pull/76310/
238 [76420]: https://github.com/rust-lang/rust/pull/76420/
239 [76158]: https://github.com/rust-lang/rust/pull/76158/
240 [75857]: https://github.com/rust-lang/rust/pull/75857/
241 [75585]: https://github.com/rust-lang/rust/pull/75585/
242 [75740]: https://github.com/rust-lang/rust/pull/75740/
243 [75502]: https://github.com/rust-lang/rust/pull/75502/
244 [74880]: https://github.com/rust-lang/rust/pull/74880/
245 [74922]: https://github.com/rust-lang/rust/pull/74922/
246 [74430]: https://github.com/rust-lang/rust/pull/74430/
247 [74194]: https://github.com/rust-lang/rust/pull/74194/
248 [73461]: https://github.com/rust-lang/rust/pull/73461/
249 [73166]: https://github.com/rust-lang/rust/pull/73166/
250 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
251 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
252 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
253 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
254 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
255 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
256 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
257 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
258 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
259 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
260 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
261 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
262 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
263 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
264 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
267 Version 1.47.0 (2020-10-08)
268 ==========================
272 - [Closures will now warn when not used.][74869]
276 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
277 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
279 - [Upgraded to LLVM 11.][73526]
280 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
281 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
282 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
284 \* Refer to Rust's [platform support page][forge-platform-support] for more
285 information on Rust's tiered platform support.
289 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
290 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
291 those of length less than 33.][74060]
292 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
293 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
294 `PartialEq`, and `PartialOrd`.][73583]
299 - [`Range::is_empty`]
300 - [`RangeInclusive::is_empty`]
301 - [`Result::as_deref`]
302 - [`Result::as_deref_mut`]
304 - [`pointer::offset_from`]
308 The following previously stable APIs have now been made const.
310 - [The `new` method for all `NonZero` integers.][73858]
311 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
312 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
313 methods for all integers.][73858]
314 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
315 signed integers.][73858]
316 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
317 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
318 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
319 `is_ascii_control` methods for `char` and `u8`.][73858]
323 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
324 You can override this by setting the following in your `Cargo.toml`.
326 [profile.release.build-override]
329 - [`cargo-help` will now display man pages for commands rather just the
330 `--help` text.][cargo/8456]
331 - [`cargo-metadata` now emits a `test` field indicating if a target has
332 tests enabled.][cargo/8478]
333 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
334 - [`cargo-publish` will now use an alternative registry by default if it's the
335 only registry specified in `package.publish`.][cargo/8571]
339 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
340 type based search.][75366]
341 - [Added the Ayu theme to rustdoc.][71237]
345 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
346 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
347 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
348 help to preserve more span information.][73084] These changes may cause
349 compiliation errors if your macro was unhygenic or didn't correctly handle
351 - [Moved support for the CloudABI target to tier 3.][75568]
352 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
353 - [Added the `rustc-docs` component.][75560] This allows you to install
354 and read the documentation for the compiler internal APIs. (Currently only
355 available for `x86_64-unknown-linux-gnu`.)
360 - [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.
362 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
363 [75048]: https://github.com/rust-lang/rust/pull/75048/
364 [74163]: https://github.com/rust-lang/rust/pull/74163/
365 [71237]: https://github.com/rust-lang/rust/pull/71237/
366 [74869]: https://github.com/rust-lang/rust/pull/74869/
367 [73858]: https://github.com/rust-lang/rust/pull/73858/
368 [75716]: https://github.com/rust-lang/rust/pull/75716/
369 [75908]: https://github.com/rust-lang/rust/pull/75908/
370 [75516]: https://github.com/rust-lang/rust/pull/75516/
371 [75560]: https://github.com/rust-lang/rust/pull/75560/
372 [75568]: https://github.com/rust-lang/rust/pull/75568/
373 [75366]: https://github.com/rust-lang/rust/pull/75366/
374 [75204]: https://github.com/rust-lang/rust/pull/75204/
375 [74650]: https://github.com/rust-lang/rust/pull/74650/
376 [74419]: https://github.com/rust-lang/rust/pull/74419/
377 [73964]: https://github.com/rust-lang/rust/pull/73964/
378 [74021]: https://github.com/rust-lang/rust/pull/74021/
379 [74060]: https://github.com/rust-lang/rust/pull/74060/
380 [73893]: https://github.com/rust-lang/rust/pull/73893/
381 [73526]: https://github.com/rust-lang/rust/pull/73526/
382 [73583]: https://github.com/rust-lang/rust/pull/73583/
383 [73084]: https://github.com/rust-lang/rust/pull/73084/
384 [73197]: https://github.com/rust-lang/rust/pull/73197/
385 [72488]: https://github.com/rust-lang/rust/pull/72488/
386 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
387 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
388 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
389 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
390 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
391 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
392 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
393 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
394 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
395 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
396 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
397 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
398 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
399 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
400 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
403 Version 1.46.0 (2020-08-27)
404 ==========================
408 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
409 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
410 const functions.][73862]
411 - [The `#[track_caller]` attribute can now be added to functions to use the
412 function's caller's location information for panic messages.][72445]
413 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
414 `x.0.0` over `(x.0).0`.
415 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
416 You currently can't use `mem::transmute` in constant functions.
420 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
421 - [Enabled static "Position Independent Executables" by default
422 for `x86_64-unknown-linux-musl`.][70740]
426 - [`mem::forget` is now a `const fn`.][73887]
427 - [`String` now implements `From<char>`.][73466]
428 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
429 integer types.][73032]
430 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
431 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
432 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
433 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
434 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
435 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
440 - [`vec::Drain::as_slice`]
444 Added a number of new environment variables that are now available when
445 compiling your crate.
447 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
448 the specific binary being compiled and the name of the crate.
449 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
450 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
454 - [The target configuration option `abi_blacklist` has been renamed
455 to `unsupported_abis`.][74150] The old name will still continue to work.
456 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
457 This was previously accepted but will become a hard error in a future release.
458 - [Rustc will fail to compile if you have a struct with
459 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
461 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
462 ensure that spans have the correct information, and may cause breakage if you
463 were relying on receiving spans with dummy information.
464 - [The InnoSetup installer for Windows is no longer available.][72569] This was
465 a legacy installer that was replaced by a MSI installer a few years ago but
466 was still being built.
467 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
468 - [Rustc will no longer accept overlapping trait implementations that only
469 differ in how the lifetime was bound.][72493]
470 - [Rustc now correctly relates the lifetime of an existential associated
471 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
472 you to pass a shorter lifetime than expected.
473 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
474 The library will need to be installed for `rustc` to work, even though we
475 expect it to be already available on most systems.
476 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
478 - [Pretty printing of some tokens in procedural macros changed.][75453] The
479 exact output returned by rustc's pretty printing is an unstable
480 implementation detail: we recommend any macro relying on it to switch to a
481 more robust parsing system.
483 [75453]: https://github.com/rust-lang/rust/issues/75453/
484 [74820]: https://github.com/rust-lang/rust/issues/74820/
485 [74420]: https://github.com/rust-lang/rust/issues/74420/
486 [74109]: https://github.com/rust-lang/rust/pull/74109/
487 [74150]: https://github.com/rust-lang/rust/pull/74150/
488 [73862]: https://github.com/rust-lang/rust/pull/73862/
489 [73887]: https://github.com/rust-lang/rust/pull/73887/
490 [73466]: https://github.com/rust-lang/rust/pull/73466/
491 [73516]: https://github.com/rust-lang/rust/pull/73516/
492 [73293]: https://github.com/rust-lang/rust/pull/73293/
493 [73007]: https://github.com/rust-lang/rust/pull/73007/
494 [73032]: https://github.com/rust-lang/rust/pull/73032/
495 [72920]: https://github.com/rust-lang/rust/pull/72920/
496 [72569]: https://github.com/rust-lang/rust/pull/72569/
497 [72583]: https://github.com/rust-lang/rust/pull/72583/
498 [72584]: https://github.com/rust-lang/rust/pull/72584/
499 [72717]: https://github.com/rust-lang/rust/pull/72717/
500 [72437]: https://github.com/rust-lang/rust/pull/72437/
501 [72445]: https://github.com/rust-lang/rust/pull/72445/
502 [72486]: https://github.com/rust-lang/rust/pull/72486/
503 [72493]: https://github.com/rust-lang/rust/pull/72493/
504 [72331]: https://github.com/rust-lang/rust/pull/72331/
505 [71896]: https://github.com/rust-lang/rust/pull/71896/
506 [71660]: https://github.com/rust-lang/rust/pull/71660/
507 [71322]: https://github.com/rust-lang/rust/pull/71322/
508 [70740]: https://github.com/rust-lang/rust/pull/70740/
509 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
510 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
511 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
512 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
513 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
516 Version 1.45.2 (2020-08-03)
517 ==========================
519 * [Fix bindings in tuple struct patterns][74954]
520 * [Fix track_caller integration with trait objects][74784]
522 [74954]: https://github.com/rust-lang/rust/issues/74954
523 [74784]: https://github.com/rust-lang/rust/issues/74784
526 Version 1.45.1 (2020-07-30)
527 ==========================
529 * [Fix const propagation with references.][73613]
530 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
531 * [Avoid spurious implicit region bound.][74509]
532 * [Install clippy on x.py install][74457]
534 [73613]: https://github.com/rust-lang/rust/pull/73613
535 [73078]: https://github.com/rust-lang/rust/issues/73078
536 [74509]: https://github.com/rust-lang/rust/pull/74509
537 [74457]: https://github.com/rust-lang/rust/pull/74457
540 Version 1.45.0 (2020-07-16)
541 ==========================
545 - [Out of range float to int conversions using `as` has been defined as a saturating
546 conversion.][71269] This was previously undefined behaviour, but you can use the
547 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
548 may be desirable in rare performance sensitive situations.
549 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
551 - [Function like procedural macros can now be used in expression, pattern, and statement
552 positions.][68717] This means you can now use a function-like procedural macro
553 anywhere you can use a declarative (`macro_rules!`) macro.
557 - [You can now override individual target features through the `target-feature`
558 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
559 equivalent to `-C target-feature=+avx2,+fma`.
560 - [Added the `force-unwind-tables` flag.][69984] This option allows
561 rustc to always generate unwind tables regardless of panic strategy.
562 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
563 to include LLVM bitcode into generated `rlib`s (this is on by default).
564 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
565 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
566 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
567 - [Upgraded to LLVM 10.][67759]
569 \* Refer to Rust's [platform support page][forge-platform-support] for more
570 information on Rust's tiered platform support.
575 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
577 - [`proc_macro::TokenStream` now implements `Default`.][72234]
578 - [You can now use `char` with
579 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
580 a range of codepoints.][72413] E.g.
581 you can now write the following;
583 for ch in 'a'..='z' {
587 // Prints "abcdefghijklmnopqrstuvwxyz"
589 - [`OsString` now implements `FromStr`.][71662]
590 - [The `saturating_neg` method has been added to all signed integer primitive
591 types, and the `saturating_abs` method has been added for all integer
592 primitive types.][71886]
593 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
594 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
596 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
597 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
598 integer types.][69813]
599 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
600 integer types.][72324]
601 - [The `fetch_update` method has been added to all atomic integer types.][71843]
606 - [`BTreeMap::remove_entry`]
608 - [`rc::Weak::as_ptr`]
609 - [`rc::Weak::from_raw`]
610 - [`rc::Weak::into_raw`]
611 - [`str::strip_prefix`]
612 - [`str::strip_suffix`]
613 - [`sync::Weak::as_ptr`]
614 - [`sync::Weak::from_raw`]
615 - [`sync::Weak::into_raw`]
616 - [`char::UNICODE_VERSION`]
617 - [`Span::resolved_at`]
618 - [`Span::located_at`]
619 - [`Span::mixed_site`]
620 - [`unix::process::CommandExt::arg0`]
625 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
630 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
631 `~~outdated information~~` becomes "~~outdated information~~".
632 - [Added an emoji to Rustdoc's deprecated API message.][72014]
636 - [Trying to self initialize a static value (that is creating a value using
637 itself) is unsound and now causes a compile error.][71140]
638 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
639 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
640 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
641 previously undocumented and not intended for public use. Rustdoc still provides
642 a non-zero exit code on errors.
643 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
644 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
645 flags while cargo is adding `embed-bitcode` itself. The recommended way to
646 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
647 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
651 - [Make clippy a git subtree instead of a git submodule][70655]
652 - [Unify the undo log of all snapshot types][69464]
654 [71848]: https://github.com/rust-lang/rust/issues/71848/
655 [73420]: https://github.com/rust-lang/rust/issues/73420/
656 [72324]: https://github.com/rust-lang/rust/pull/72324/
657 [71843]: https://github.com/rust-lang/rust/pull/71843/
658 [71886]: https://github.com/rust-lang/rust/pull/71886/
659 [72234]: https://github.com/rust-lang/rust/pull/72234/
660 [72239]: https://github.com/rust-lang/rust/pull/72239/
661 [72397]: https://github.com/rust-lang/rust/pull/72397/
662 [72413]: https://github.com/rust-lang/rust/pull/72413/
663 [72014]: https://github.com/rust-lang/rust/pull/72014/
664 [72062]: https://github.com/rust-lang/rust/pull/72062/
665 [72094]: https://github.com/rust-lang/rust/pull/72094/
666 [72133]: https://github.com/rust-lang/rust/pull/72133/
667 [67759]: https://github.com/rust-lang/rust/pull/67759/
668 [71900]: https://github.com/rust-lang/rust/pull/71900/
669 [71928]: https://github.com/rust-lang/rust/pull/71928/
670 [71662]: https://github.com/rust-lang/rust/pull/71662/
671 [71716]: https://github.com/rust-lang/rust/pull/71716/
672 [71447]: https://github.com/rust-lang/rust/pull/71447/
673 [71269]: https://github.com/rust-lang/rust/pull/71269/
674 [71095]: https://github.com/rust-lang/rust/pull/71095/
675 [71140]: https://github.com/rust-lang/rust/pull/71140/
676 [70655]: https://github.com/rust-lang/rust/pull/70655/
677 [70705]: https://github.com/rust-lang/rust/pull/70705/
678 [69984]: https://github.com/rust-lang/rust/pull/69984/
679 [69813]: https://github.com/rust-lang/rust/pull/69813/
680 [69464]: https://github.com/rust-lang/rust/pull/69464/
681 [68717]: https://github.com/rust-lang/rust/pull/68717/
682 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
683 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
684 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
685 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
686 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
687 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
688 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
689 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
690 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
691 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
692 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
693 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
694 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
695 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
696 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
697 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
698 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
701 Version 1.44.1 (2020-06-18)
702 ===========================
704 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
705 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
706 * [Fix crashes when finding backtrace on macOS.][71397]
707 * [Clippy applies lint levels into different files.][clippy/5356]
709 [71397]: https://github.com/rust-lang/rust/issues/71397
710 [73078]: https://github.com/rust-lang/rust/issues/73078
711 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
712 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
715 Version 1.44.0 (2020-06-04)
716 ==========================
720 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
721 - [Added the `unused_braces` lint.][70081]
723 **Syntax-only changes**
725 - [Expansion-driven outline module parsing][69838]
730 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
735 These are still rejected semantically, so you will likely receive an error but
736 these changes can be seen and parsed by macros and conditional compilation.
740 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
741 Additionally when in incremental mode rustc defaults to 256 codegen units.
742 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
743 a panic is thrown.][67502]
744 - [Added tier 3\* support for the `aarch64-unknown-none` and
745 `aarch64-unknown-none-softfloat` targets.][68334]
746 - [Added tier 3 support for `arm64-apple-tvos` and
747 `x86_64-apple-tvos` targets.][68191]
752 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
753 `vec![]` to be able to be used in `const` contexts.
754 - [`convert::Infallible` now implements `Hash`.][70281]
755 - [`OsString` now implements `DerefMut` and `IndexMut` returning
756 a `&mut OsStr`.][70048]
757 - [Unicode 13 is now supported.][69929]
758 - [`String` now implements `From<&mut str>`.][69661]
759 - [`IoSlice` now implements `Copy`.][69403]
760 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
761 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
762 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
763 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
764 integer types.][69373]
768 - [`PathBuf::with_capacity`]
769 - [`PathBuf::capacity`]
771 - [`PathBuf::reserve`]
772 - [`PathBuf::reserve_exact`]
773 - [`PathBuf::shrink_to_fit`]
774 - [`f32::to_int_unchecked`]
775 - [`f64::to_int_unchecked`]
776 - [`Layout::align_to`]
777 - [`Layout::pad_to_align`]
783 - [Added the `cargo tree` command which will print a tree graph of
784 your dependencies.][cargo/8062] E.g.
786 mdbook v0.3.2 (/Users/src/rust/mdbook)
788 │ ├── html5ever v0.24.0
790 │ │ │ └── cfg-if v0.1.9
792 │ │ └── markup5ever v0.9.0
793 │ │ ├── log v0.4.8 (*)
795 │ │ │ └── phf_shared v0.7.24
796 │ │ │ ├── siphasher v0.2.3
797 │ │ │ └── unicase v1.4.2
798 │ │ │ [build-dependencies]
799 │ │ │ └── version_check v0.1.5
802 You can also display dependencies on multiple versions of the same crate with
803 `cargo tree -d` (short for `cargo tree --duplicates`).
807 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
808 the version in the sidebar.][69494]
812 - [Rustc now correctly generates static libraries on Windows GNU targets with
813 the `.a` extension, rather than the previous `.lib`.][70937]
814 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
815 - [The `file_name` property in JSON output of macro errors now points the actual
816 source file rather than the previous format of `<NAME macros>`.][70969]
817 **Note:** this may not point to a file that actually exists on the user's system.
818 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
819 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
820 not allow zero initialization such as `NonZeroU8`.][66059] This was
821 previously a warning.
822 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
823 operator has been defined as a saturating operation.][71269] This was previously
824 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
825 continue using the current behaviour, which may be desirable in rare performance
826 sensitive situations.
830 These changes provide no direct user facing benefits, but represent significant
831 improvements to the internals and overall performance of rustc and
834 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
835 - [Replace big JS dict with JSON parsing.][71250]
837 [69373]: https://github.com/rust-lang/rust/pull/69373/
838 [66059]: https://github.com/rust-lang/rust/pull/66059/
839 [68191]: https://github.com/rust-lang/rust/pull/68191/
840 [68899]: https://github.com/rust-lang/rust/pull/68899/
841 [71147]: https://github.com/rust-lang/rust/pull/71147/
842 [71250]: https://github.com/rust-lang/rust/pull/71250/
843 [70937]: https://github.com/rust-lang/rust/pull/70937/
844 [70969]: https://github.com/rust-lang/rust/pull/70969/
845 [70632]: https://github.com/rust-lang/rust/pull/70632/
846 [70281]: https://github.com/rust-lang/rust/pull/70281/
847 [70345]: https://github.com/rust-lang/rust/pull/70345/
848 [70048]: https://github.com/rust-lang/rust/pull/70048/
849 [70081]: https://github.com/rust-lang/rust/pull/70081/
850 [70156]: https://github.com/rust-lang/rust/pull/70156/
851 [71269]: https://github.com/rust-lang/rust/pull/71269/
852 [69838]: https://github.com/rust-lang/rust/pull/69838/
853 [69929]: https://github.com/rust-lang/rust/pull/69929/
854 [69661]: https://github.com/rust-lang/rust/pull/69661/
855 [69778]: https://github.com/rust-lang/rust/pull/69778/
856 [69494]: https://github.com/rust-lang/rust/pull/69494/
857 [69403]: https://github.com/rust-lang/rust/pull/69403/
858 [69033]: https://github.com/rust-lang/rust/pull/69033/
859 [68692]: https://github.com/rust-lang/rust/pull/68692/
860 [68334]: https://github.com/rust-lang/rust/pull/68334/
861 [67502]: https://github.com/rust-lang/rust/pull/67502/
862 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
863 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
864 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
865 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
866 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
867 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
868 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
869 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
870 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
871 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
872 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
873 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
874 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
877 Version 1.43.1 (2020-05-07)
878 ===========================
880 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
881 * [Fixed the stabilization of AVX-512 features.][71473]
882 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
884 [71430]: https://github.com/rust-lang/rust/pull/71430
885 [71473]: https://github.com/rust-lang/rust/issues/71473
886 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
889 Version 1.43.0 (2020-04-23)
890 ==========================
894 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
895 the type inferred correctly.][68129]
896 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
898 **Syntax only changes**
899 - [Allow `type Foo: Ord` syntactically.][69361]
900 - [Fuse associated and extern items up to defaultness.][69194]
901 - [Syntactically allow `self` in all `fn` contexts.][68764]
902 - [Merge `fn` syntax + cleanup item parsing.][68728]
903 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
904 For example, you may now write:
906 macro_rules! mac_trait {
916 These are still rejected *semantically*, so you will likely receive an error but
917 these changes can be seen and parsed by macros and
918 conditional compilation.
923 - [You can now pass multiple lint flags to rustc to override the previous
924 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
925 everything in the `unused` lint group except `unused-variables` which
926 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
927 everything in the `unused` lint group **including** `unused-variables` since
928 the allow flag is specified before the deny flag (and therefore overridden).
929 - [rustc will now prefer your system MinGW libraries over its bundled libraries
930 if they are available on `windows-gnu`.][67429]
931 - [rustc now buffers errors/warnings printed in JSON.][69227]
935 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
936 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
937 respectively.][69538] **Note** These conversions are only available when `N`
939 - [You can now use associated constants on floats and integers directly, rather
940 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
941 `f32::NAN` with no imports.
942 - [`u8::is_ascii` is now `const`.][68984]
943 - [`String` now implements `AsMut<str>`.][68742]
944 - [Added the `primitive` module to `std` and `core`.][67637] This module
945 reexports Rust's primitive types. This is mainly useful in macros
946 where you want avoid these types being shadowed.
947 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
948 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
952 - [`Once::is_completed`]
957 - [`iter::once_with`]
961 - [You can now set config `[profile]`s in your `.cargo/config`, or through
962 your environment.][cargo/7823]
963 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
964 executable path when running integration tests or benchmarks.][cargo/7697]
965 `<name>` is the name of your binary as-is e.g. If you wanted the executable
966 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
970 - [Certain checks in the `const_err` lint were deemed unrelated to const
971 evaluation][69185], and have been moved to the `unconditional_panic` and
972 `arithmetic_overflow` lints.
977 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
978 has been a warning since 1.36.0.
979 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
980 led to some instances being accepted, and now correctly emits a hard error.
982 [69340]: https://github.com/rust-lang/rust/pull/69340
986 These changes provide no direct user facing benefits, but represent significant
987 improvements to the internals and overall performance of `rustc` and
990 - [All components are now built with `opt-level=3` instead of `2`.][67878]
991 - [Improved how rustc generates drop code.][67332]
992 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
993 - [traits: preallocate 2 Vecs of known initial size][69022]
994 - [Avoid exponential behaviour when relating types][68772]
995 - [Skip `Drop` terminators for enum variants without drop glue][68943]
996 - [Improve performance of coherence checks][68966]
997 - [Deduplicate types in the generator witness][68672]
998 - [Invert control in struct_lint_level.][68725]
1000 [67332]: https://github.com/rust-lang/rust/pull/67332/
1001 [67429]: https://github.com/rust-lang/rust/pull/67429/
1002 [67637]: https://github.com/rust-lang/rust/pull/67637/
1003 [67642]: https://github.com/rust-lang/rust/pull/67642/
1004 [67878]: https://github.com/rust-lang/rust/pull/67878/
1005 [67885]: https://github.com/rust-lang/rust/pull/67885/
1006 [68129]: https://github.com/rust-lang/rust/pull/68129/
1007 [68672]: https://github.com/rust-lang/rust/pull/68672/
1008 [68725]: https://github.com/rust-lang/rust/pull/68725/
1009 [68728]: https://github.com/rust-lang/rust/pull/68728/
1010 [68738]: https://github.com/rust-lang/rust/pull/68738/
1011 [68742]: https://github.com/rust-lang/rust/pull/68742/
1012 [68764]: https://github.com/rust-lang/rust/pull/68764/
1013 [68772]: https://github.com/rust-lang/rust/pull/68772/
1014 [68943]: https://github.com/rust-lang/rust/pull/68943/
1015 [68952]: https://github.com/rust-lang/rust/pull/68952/
1016 [68966]: https://github.com/rust-lang/rust/pull/68966/
1017 [68984]: https://github.com/rust-lang/rust/pull/68984/
1018 [69022]: https://github.com/rust-lang/rust/pull/69022/
1019 [69185]: https://github.com/rust-lang/rust/pull/69185/
1020 [69194]: https://github.com/rust-lang/rust/pull/69194/
1021 [69201]: https://github.com/rust-lang/rust/pull/69201/
1022 [69227]: https://github.com/rust-lang/rust/pull/69227/
1023 [69548]: https://github.com/rust-lang/rust/pull/69548/
1024 [69256]: https://github.com/rust-lang/rust/pull/69256/
1025 [69361]: https://github.com/rust-lang/rust/pull/69361/
1026 [69366]: https://github.com/rust-lang/rust/pull/69366/
1027 [69538]: https://github.com/rust-lang/rust/pull/69538/
1028 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1029 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1030 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1031 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1032 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1033 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1034 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1035 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1038 Version 1.42.0 (2020-03-12)
1039 ==========================
1043 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1045 fn foo(words: &[&str]) {
1047 ["Hello", "World", "!", ..] => println!("Hello World!"),
1048 ["Foo", "Bar", ..] => println!("Baz"),
1049 rest => println!("{:?}", rest),
1053 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1054 that you can create an enum that has the exact layout and ABI of the type
1056 - [There are some *syntax-only* changes:][67131]
1057 - `default` is syntactically allowed before items in `trait` definitions.
1058 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1059 leave out their bodies in favor of `;`.
1060 - Bounds on associated types in `impl`s are now syntactically allowed
1061 (e.g. `type Foo: Ord;`).
1062 - `...` (the C-variadic type) may occur syntactically directly as the type of
1063 any function parameter.
1065 These are still rejected *semantically*, so you will likely receive an error
1066 but these changes can be seen and parsed by procedural macros and
1067 conditional compilation.
1071 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1072 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1073 - [`Option::{expect,unwrap}` and
1074 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1075 pointing to the location where they were called, rather than
1076 `core`'s internals. ][67887]
1078 \* Refer to Rust's [platform support page][forge-platform-support] for more
1079 information on Rust's tiered platform support.
1083 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1084 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1085 to implement `Sized`.][67935]
1086 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1087 - [`Layout::new` is now `const`.][66254]
1088 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1093 - [`CondVar::wait_while`]
1094 - [`CondVar::wait_timeout_while`]
1096 - [`DebugMap::value`]
1097 - [`ManuallyDrop::take`]
1099 - [`ptr::slice_from_raw_parts_mut`]
1100 - [`ptr::slice_from_raw_parts`]
1104 - [You no longer need to include `extern crate proc_macro;` to be able to
1105 `use proc_macro;` in the `2018` edition.][cargo/7700]
1109 - [`Error::description` has been deprecated, and its use will now produce a
1110 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1112 [68253]: https://github.com/rust-lang/rust/pull/68253/
1113 [68348]: https://github.com/rust-lang/rust/pull/68348/
1114 [67935]: https://github.com/rust-lang/rust/pull/67935/
1115 [68339]: https://github.com/rust-lang/rust/pull/68339/
1116 [68122]: https://github.com/rust-lang/rust/pull/68122/
1117 [67712]: https://github.com/rust-lang/rust/pull/67712/
1118 [67887]: https://github.com/rust-lang/rust/pull/67887/
1119 [67131]: https://github.com/rust-lang/rust/pull/67131/
1120 [67233]: https://github.com/rust-lang/rust/pull/67233/
1121 [66899]: https://github.com/rust-lang/rust/pull/66899/
1122 [66919]: https://github.com/rust-lang/rust/pull/66919/
1123 [66254]: https://github.com/rust-lang/rust/pull/66254/
1124 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1125 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1126 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1127 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1128 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1129 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1130 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1131 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1132 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1135 Version 1.41.1 (2020-02-27)
1136 ===========================
1138 * [Always check types of static items][69145]
1139 * [Always check lifetime bounds of `Copy` impls][69145]
1140 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1142 [69225]: https://github.com/rust-lang/rust/issues/69225
1143 [69145]: https://github.com/rust-lang/rust/pull/69145
1146 Version 1.41.0 (2020-01-30)
1147 ===========================
1152 - [You can now pass type parameters to foreign items when implementing
1153 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1154 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1155 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1156 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1157 - [You can now use any valid identifier in a `format_args` macro.][66847]
1158 Previously identifiers starting with an underscore were not allowed.
1159 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1160 enum variants.][66183] These are still rejected semantically, but
1161 can be seen and parsed by procedural macros and conditional compilation.
1166 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1167 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1168 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1169 - [You can now pass an arguments file passing the `@path` syntax
1170 to rustc.][66172] Note that the format differs somewhat from what is
1171 found in other tooling; please see [the documentation][argfile-docs] for
1173 - [You can now provide `--extern` flag without a path, indicating that it is
1174 available from the search path or specified with an `-L` flag.][64882]
1176 \* Refer to Rust's [platform support page][forge-platform-support] for more
1177 information on Rust's tiered platform support.
1179 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1184 - [The `core::panic` module is now stable.][66771] It was already stable
1186 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1187 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1188 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1193 - [`Result::map_or`]
1194 - [`Result::map_or_else`]
1195 - [`std::rc::Weak::weak_count`]
1196 - [`std::rc::Weak::strong_count`]
1197 - [`std::sync::Weak::weak_count`]
1198 - [`std::sync::Weak::strong_count`]
1203 - [Cargo will now document all the private items for binary crates
1204 by default.][cargo/7593]
1205 - [`cargo-install` will now reinstall the package if it detects that it is out
1206 of date.][cargo/7560]
1207 - [Cargo.lock now uses a more git friendly format that should help to reduce
1208 merge conflicts.][cargo/7579]
1209 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1210 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1211 optimisation level to `2` for debug builds. You can also use
1212 `[profile.<profile>.build-override]` to override build scripts and
1218 - [You can now specify `edition` in documentation code blocks to compile the block
1219 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1220 should be compiled the 2018 edition of Rust.
1221 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1222 current theme with `--check-theme`.][54733]
1223 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1228 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1229 Apple targets.][apple-32bit-drop] This means that the source code is still
1230 available to build, but the targets are no longer being tested and release
1231 binaries for those platforms will no longer be distributed by the Rust project.
1232 Please refer to the linked blog post for more information.
1234 [54733]: https://github.com/rust-lang/rust/pull/54733/
1235 [61351]: https://github.com/rust-lang/rust/pull/61351/
1236 [67255]: https://github.com/rust-lang/rust/pull/67255/
1237 [66661]: https://github.com/rust-lang/rust/pull/66661/
1238 [66771]: https://github.com/rust-lang/rust/pull/66771/
1239 [66847]: https://github.com/rust-lang/rust/pull/66847/
1240 [66238]: https://github.com/rust-lang/rust/pull/66238/
1241 [66277]: https://github.com/rust-lang/rust/pull/66277/
1242 [66325]: https://github.com/rust-lang/rust/pull/66325/
1243 [66172]: https://github.com/rust-lang/rust/pull/66172/
1244 [66183]: https://github.com/rust-lang/rust/pull/66183/
1245 [65879]: https://github.com/rust-lang/rust/pull/65879/
1246 [65013]: https://github.com/rust-lang/rust/pull/65013/
1247 [64882]: https://github.com/rust-lang/rust/pull/64882/
1248 [64325]: https://github.com/rust-lang/rust/pull/64325/
1249 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1250 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1251 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1252 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1253 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1254 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1255 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1256 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1257 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1258 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1259 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1261 Version 1.40.0 (2019-12-19)
1262 ===========================
1266 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1267 `const` contexts.][65188] e.g.
1270 pub struct Point(i32, i32);
1272 const ORIGIN: Point = {
1273 let constructor = Point;
1279 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1280 indicate that there may be variants or fields added in the future.][64639]
1281 For example this requires adding a wild-card branch (`_ => {}`) to any match
1282 statements on a non-exhaustive `enum`. [(RFC 2008)]
1283 - [You can now use function-like procedural macros in `extern` blocks and in
1284 type positions.][63931] e.g. `type Generated = macro!();`
1285 - [Function-like and attribute procedural macros can now emit
1286 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1287 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1288 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1289 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1293 - [Added tier 3 support\* for the
1294 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1295 - [Added tier 3 support for the
1296 `aarch64-unknown-none-softfloat` target.][64589]
1297 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1298 `mips64el-unknown-linux-muslabi64` targets.][65843]
1300 \* Refer to Rust's [platform support page][forge-platform-support] for more
1301 information on Rust's tiered platform support.
1305 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1309 - [`BTreeMap::get_key_value`]
1310 - [`HashMap::get_key_value`]
1311 - [`Option::as_deref_mut`]
1312 - [`Option::as_deref`]
1313 - [`Option::flatten`]
1314 - [`UdpSocket::peer_addr`]
1315 - [`f32::to_be_bytes`]
1316 - [`f32::to_le_bytes`]
1317 - [`f32::to_ne_bytes`]
1318 - [`f64::to_be_bytes`]
1319 - [`f64::to_le_bytes`]
1320 - [`f64::to_ne_bytes`]
1321 - [`f32::from_be_bytes`]
1322 - [`f32::from_le_bytes`]
1323 - [`f32::from_ne_bytes`]
1324 - [`f64::from_be_bytes`]
1325 - [`f64::from_le_bytes`]
1326 - [`f64::from_ne_bytes`]
1333 - [Cargo will now always display warnings, rather than only on
1334 fresh builds.][cargo/7450]
1335 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1336 now produce an error.][cargo/7507] Previously these flags were ignored.
1337 - [You can now publish `dev-dependencies` without including
1338 a `version`.][cargo/7333]
1342 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1343 when running documentation tests with `rustdoc`.][63803]
1347 - [As previously announced, any previous NLL warnings in the 2015 edition are
1348 now hard errors.][64221]
1349 - [The `include!` macro will now warn if it failed to include the
1350 entire file.][64284] The `include!` macro unintentionally only includes the
1351 first _expression_ in a file, and this can be unintuitive. This will become
1352 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1353 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1354 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1355 or `extern` blocks now correctly emits a hard error.
1357 [65294]: https://github.com/rust-lang/rust/pull/65294/
1358 [66103]: https://github.com/rust-lang/rust/pull/66103/
1359 [65843]: https://github.com/rust-lang/rust/pull/65843/
1360 [65188]: https://github.com/rust-lang/rust/pull/65188/
1361 [65092]: https://github.com/rust-lang/rust/pull/65092/
1362 [64589]: https://github.com/rust-lang/rust/pull/64589/
1363 [64639]: https://github.com/rust-lang/rust/pull/64639/
1364 [64221]: https://github.com/rust-lang/rust/pull/64221/
1365 [64284]: https://github.com/rust-lang/rust/pull/64284/
1366 [63931]: https://github.com/rust-lang/rust/pull/63931/
1367 [64035]: https://github.com/rust-lang/rust/pull/64035/
1368 [63674]: https://github.com/rust-lang/rust/pull/63674/
1369 [63803]: https://github.com/rust-lang/rust/pull/63803/
1370 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1371 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1372 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1373 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1374 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1375 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1376 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1377 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1378 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1379 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1380 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1381 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1382 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1383 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1384 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1385 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1386 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1387 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1388 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1389 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1390 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1391 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1392 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1393 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1394 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1395 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1398 Version 1.39.0 (2019-11-07)
1399 ===========================
1403 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1404 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1405 - [You can now use certain attributes on function, closure, and function pointer
1406 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1407 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1408 attributes applied to items. e.g.
1411 #[cfg(windows)] slice: &[u16],
1412 #[cfg(not(windows))] slice: &[u8],
1417 - [You can now take shared references to bind-by-move patterns in the `if` guards
1418 of `match` arms.][63118] e.g.
1421 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1425 // ---- `nums` is bound by move.
1426 if nums.iter().sum::<u8>() == 10
1427 // ^------ `.iter()` implicitly takes a reference to `nums`.
1430 // ----------- Legal as `nums` was bound by move and so we have ownership.
1432 _ => unreachable!(),
1441 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1442 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1443 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1444 **Note** Cargo currently doesn't use this feature. Refer to
1445 [cargo#7315][cargo/7315] to track this feature's progress.
1446 - [You can now pass `--show-output` argument to test binaries to print the
1447 output of successful tests.][62600]
1450 \* Refer to Rust's [platform support page][forge-platform-support] for more
1451 information on Rust's tiered platform support.
1455 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1456 - [`LinkedList::new` is now a `const` function.][63684]
1457 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1458 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1459 now `const`.][63786]
1463 - [`Pin::into_inner`]
1464 - [`Instant::checked_duration_since`]
1465 - [`Instant::saturating_duration_since`]
1469 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1470 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1471 `--all` is now deprecated.
1475 - [You can now pass `-Clinker` to rustdoc to control the linker used
1476 for compiling doctests.][63834]
1480 - [Code that was previously accepted by the old borrow checker, but rejected by
1481 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1482 previously a warning, and will also become a hard error in the Rust 2015
1483 edition in the 1.40.0 release.
1484 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1485 run tests.][63827] This should improve performance when running a large
1487 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1488 recommended to use the `?` operator instead.
1489 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1492 [62600]: https://github.com/rust-lang/rust/pull/62600/
1493 [62672]: https://github.com/rust-lang/rust/pull/62672/
1494 [63118]: https://github.com/rust-lang/rust/pull/63118/
1495 [63209]: https://github.com/rust-lang/rust/pull/63209/
1496 [63402]: https://github.com/rust-lang/rust/pull/63402/
1497 [63565]: https://github.com/rust-lang/rust/pull/63565/
1498 [63595]: https://github.com/rust-lang/rust/pull/63595/
1499 [63684]: https://github.com/rust-lang/rust/pull/63684/
1500 [63698]: https://github.com/rust-lang/rust/pull/63698/
1501 [63770]: https://github.com/rust-lang/rust/pull/63770/
1502 [63786]: https://github.com/rust-lang/rust/pull/63786/
1503 [63827]: https://github.com/rust-lang/rust/pull/63827/
1504 [63834]: https://github.com/rust-lang/rust/pull/63834/
1505 [63927]: https://github.com/rust-lang/rust/pull/63927/
1506 [63933]: https://github.com/rust-lang/rust/pull/63933/
1507 [63934]: https://github.com/rust-lang/rust/pull/63934/
1508 [63938]: https://github.com/rust-lang/rust/pull/63938/
1509 [63940]: https://github.com/rust-lang/rust/pull/63940/
1510 [63941]: https://github.com/rust-lang/rust/pull/63941/
1511 [63945]: https://github.com/rust-lang/rust/pull/63945/
1512 [64010]: https://github.com/rust-lang/rust/pull/64010/
1513 [64028]: https://github.com/rust-lang/rust/pull/64028/
1514 [64334]: https://github.com/rust-lang/rust/pull/64334/
1515 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1516 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1517 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1518 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1519 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1520 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1522 Version 1.38.0 (2019-09-26)
1523 ==========================
1527 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1528 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1532 - [Added pipelined compilation support to `rustc`.][62766] This will
1533 improve compilation times in some cases. For further information please refer
1534 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1535 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1536 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1537 `x86_64-uwp-windows-msvc` targets.][60260]
1538 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1539 `armv7-unknown-linux-musleabi` targets.][63107]
1540 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1541 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1542 - [Upgraded to LLVM 9.][62592]
1544 \* Refer to Rust's [platform support page][forge-platform-support] for more
1545 information on Rust's tiered platform support.
1549 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1550 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1551 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1552 is available at `std::clone::Clone`). This also makes all built-in macros
1553 available in `std`/`core` root. e.g. `std::include_bytes!`.
1554 - [`str::Chars` now implements `Debug`.][63000]
1555 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1556 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1557 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1558 - [Added euclidean remainder and division operations (`div_euclid`,
1559 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1560 `overflowing`, and `wrapping` versions are available for all
1562 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1563 `PartialEq`.][61491]
1564 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1568 - [`<*const T>::cast`]
1569 - [`<*mut T>::cast`]
1570 - [`Duration::as_secs_f32`]
1571 - [`Duration::as_secs_f64`]
1572 - [`Duration::div_f32`]
1573 - [`Duration::div_f64`]
1574 - [`Duration::from_secs_f32`]
1575 - [`Duration::from_secs_f64`]
1576 - [`Duration::mul_f32`]
1577 - [`Duration::mul_f64`]
1578 - [`any::type_name`]
1582 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1583 - [You can now pass the `--features` option multiple times to enable
1584 multiple features.][cargo/7084]
1588 - [`rustc` will now warn about some incorrect uses of
1589 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1593 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1595 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1596 issues][62896] with certain crates such as libc.
1598 [60260]: https://github.com/rust-lang/rust/pull/60260/
1599 [61457]: https://github.com/rust-lang/rust/pull/61457/
1600 [61491]: https://github.com/rust-lang/rust/pull/61491/
1601 [61884]: https://github.com/rust-lang/rust/pull/61884/
1602 [61953]: https://github.com/rust-lang/rust/pull/61953/
1603 [62042]: https://github.com/rust-lang/rust/pull/62042/
1604 [62528]: https://github.com/rust-lang/rust/pull/62528/
1605 [62583]: https://github.com/rust-lang/rust/pull/62583/
1606 [62735]: https://github.com/rust-lang/rust/pull/62735/
1607 [62766]: https://github.com/rust-lang/rust/pull/62766/
1608 [62784]: https://github.com/rust-lang/rust/pull/62784/
1609 [62592]: https://github.com/rust-lang/rust/pull/62592/
1610 [62785]: https://github.com/rust-lang/rust/issues/62785/
1611 [62814]: https://github.com/rust-lang/rust/pull/62814/
1612 [62896]: https://github.com/rust-lang/rust/issues/62896/
1613 [63000]: https://github.com/rust-lang/rust/pull/63000/
1614 [63056]: https://github.com/rust-lang/rust/pull/63056/
1615 [63107]: https://github.com/rust-lang/rust/pull/63107/
1616 [63346]: https://github.com/rust-lang/rust/pull/63346/
1617 [63421]: https://github.com/rust-lang/rust/pull/63421/
1618 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1619 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1620 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1621 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1622 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1623 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1624 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1625 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1626 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1627 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1628 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1629 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1630 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1631 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1632 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1634 Version 1.37.0 (2019-08-15)
1635 ==========================
1639 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1640 [`Box`][62228], or an [array][62235] and unused.
1641 - [You can now use the `cfg` and `cfg_attr` attributes on
1642 generic parameters.][61547]
1643 - [You can now use enum variants through type alias.][61682] e.g. You can
1644 write the following:
1646 type MyOption = Option<u8>;
1648 fn increment_or_zero(x: MyOption) -> u8 {
1650 MyOption::Some(y) => y + 1,
1651 MyOption::None => 0,
1655 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1656 `const _: u32 = 5;`.
1657 - [You can now use `#[repr(align(X)]` on enums.][61229]
1658 - [The `?` Kleene macro operator is now available in the
1659 2015 edition.][60932]
1663 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1664 and `-C profile-use` flags.][61268] For more information on how to use profile
1665 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1666 - [The `rust-lldb` wrapper script should now work again.][61827]
1670 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1674 - [`BufReader::buffer`]
1675 - [`BufWriter::buffer`]
1676 - [`Cell::from_mut`]
1677 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1678 - [`DoubleEndedIterator::nth_back`]
1680 - [`Wrapping::reverse_bits`]
1681 - [`i128::reverse_bits`]
1682 - [`i16::reverse_bits`]
1683 - [`i32::reverse_bits`]
1684 - [`i64::reverse_bits`]
1685 - [`i8::reverse_bits`]
1686 - [`isize::reverse_bits`]
1687 - [`slice::copy_within`]
1688 - [`u128::reverse_bits`]
1689 - [`u16::reverse_bits`]
1690 - [`u32::reverse_bits`]
1691 - [`u64::reverse_bits`]
1692 - [`u8::reverse_bits`]
1693 - [`usize::reverse_bits`]
1697 - [`Cargo.lock` files are now included by default when publishing executable crates
1698 with executables.][cargo/7026]
1699 - [You can now specify `default-run="foo"` in `[package]` to specify the
1700 default executable to use for `cargo run`.][cargo/7056]
1707 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1708 Please transition your code to using the `..=` syntax for inclusive
1710 - [Using a trait object without the `dyn` will now warn by default.][61203]
1711 Please transition your code to use `dyn Trait` for trait objects instead.
1713 [62228]: https://github.com/rust-lang/rust/pull/62228/
1714 [62235]: https://github.com/rust-lang/rust/pull/62235/
1715 [61802]: https://github.com/rust-lang/rust/pull/61802/
1716 [61827]: https://github.com/rust-lang/rust/pull/61827/
1717 [61547]: https://github.com/rust-lang/rust/pull/61547/
1718 [61682]: https://github.com/rust-lang/rust/pull/61682/
1719 [61268]: https://github.com/rust-lang/rust/pull/61268/
1720 [61342]: https://github.com/rust-lang/rust/pull/61342/
1721 [61347]: https://github.com/rust-lang/rust/pull/61347/
1722 [61100]: https://github.com/rust-lang/rust/pull/61100/
1723 [61203]: https://github.com/rust-lang/rust/pull/61203/
1724 [61229]: https://github.com/rust-lang/rust/pull/61229/
1725 [60932]: https://github.com/rust-lang/rust/pull/60932/
1726 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1727 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1728 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1729 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1730 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1731 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1732 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1733 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1734 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1735 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1736 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1737 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1738 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1739 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1740 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1741 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1742 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1743 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1744 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1745 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1746 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1747 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1748 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1749 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1752 Version 1.36.0 (2019-07-04)
1753 ==========================
1757 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1758 - [The order of traits in trait objects no longer affects the semantics of that
1759 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1760 `dyn fmt::Debug + Send`, where this was previously not the case.
1764 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1765 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1766 - [`mem::needs_drop` is now available as a const fn.][60364]
1767 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1768 - [`String` now implements `BorrowMut<str>`.][60404]
1769 - [`io::Cursor` now implements `Default`.][60234]
1770 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1771 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1772 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1773 environment has access to heap memory allocation.
1774 - [`String` now implements `From<&String>`.][59825]
1775 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1776 return a tuple of each argument when there is multiple arguments.
1777 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1782 - [`VecDeque::rotate_left`]
1783 - [`VecDeque::rotate_right`]
1784 - [`Iterator::copied`]
1786 - [`io::IoSliceMut`]
1787 - [`Read::read_vectored`]
1788 - [`Write::write_vectored`]
1789 - [`str::as_mut_ptr`]
1790 - [`mem::MaybeUninit`]
1791 - [`pointer::align_offset`]
1792 - [`future::Future`]
1794 - [`task::RawWaker`]
1795 - [`task::RawWakerVTable`]
1801 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1802 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1804 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1808 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1815 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1816 longer recommended, and will be deprecated in 1.39.0.
1818 [60318]: https://github.com/rust-lang/rust/pull/60318/
1819 [60364]: https://github.com/rust-lang/rust/pull/60364/
1820 [60370]: https://github.com/rust-lang/rust/pull/60370/
1821 [60404]: https://github.com/rust-lang/rust/pull/60404/
1822 [60234]: https://github.com/rust-lang/rust/pull/60234/
1823 [60244]: https://github.com/rust-lang/rust/pull/60244/
1824 [58623]: https://github.com/rust-lang/rust/pull/58623/
1825 [59648]: https://github.com/rust-lang/rust/pull/59648/
1826 [59675]: https://github.com/rust-lang/rust/pull/59675/
1827 [59825]: https://github.com/rust-lang/rust/pull/59825/
1828 [59826]: https://github.com/rust-lang/rust/pull/59826/
1829 [59445]: https://github.com/rust-lang/rust/pull/59445/
1830 [59114]: https://github.com/rust-lang/rust/pull/59114/
1831 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1832 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1833 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1834 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1835 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1836 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1837 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1838 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1839 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1840 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1841 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1842 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1843 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1844 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1845 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1846 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1847 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1848 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1849 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1850 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1853 Version 1.35.0 (2019-05-23)
1854 ==========================
1858 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1859 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1860 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1862 unsafe fn call_unsafe(func: unsafe fn()) {
1867 unsafe { call_unsafe(|| {}); }
1874 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1875 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1876 - [Added the `wasm32-unknown-wasi` target.][59464]
1881 - [`Thread` will now show its ID in `Debug` output.][59460]
1882 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1883 - [`alloc::System` now implements `Default`.][59451]
1884 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1886 - [`char::{ToLowercase, ToUppercase}` now
1887 implement `ExactSizeIterator`.][58778]
1888 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1889 - [Removed the `Read` trait bounds
1890 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1891 - [You can now call the `dbg!` macro without any parameters to print the file
1892 and line where it is called.][57847]
1893 - [In place ASCII case conversions are now up to 4× faster.][59283]
1894 e.g. `str::make_ascii_lowercase`
1895 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1902 - [`RefCell::replace_with`]
1903 - [`RefCell::map_split`]
1905 - [`Range::contains`]
1906 - [`RangeFrom::contains`]
1907 - [`RangeTo::contains`]
1908 - [`RangeInclusive::contains`]
1909 - [`RangeToInclusive::contains`]
1910 - [`Option::copied`]
1914 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1915 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1920 - [The Rust toolchain is now available natively for musl based distros.][58575]
1922 [59460]: https://github.com/rust-lang/rust/pull/59460/
1923 [59464]: https://github.com/rust-lang/rust/pull/59464/
1924 [59500]: https://github.com/rust-lang/rust/pull/59500/
1925 [59512]: https://github.com/rust-lang/rust/pull/59512/
1926 [59580]: https://github.com/rust-lang/rust/pull/59580/
1927 [59283]: https://github.com/rust-lang/rust/pull/59283/
1928 [59451]: https://github.com/rust-lang/rust/pull/59451/
1929 [59076]: https://github.com/rust-lang/rust/pull/59076/
1930 [58778]: https://github.com/rust-lang/rust/pull/58778/
1931 [58717]: https://github.com/rust-lang/rust/pull/58717/
1932 [58369]: https://github.com/rust-lang/rust/pull/58369/
1933 [58423]: https://github.com/rust-lang/rust/pull/58423/
1934 [58080]: https://github.com/rust-lang/rust/pull/58080/
1935 [57847]: https://github.com/rust-lang/rust/pull/57847/
1936 [58575]: https://github.com/rust-lang/rust/pull/58575
1937 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1938 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1939 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1940 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1941 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1942 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1943 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1944 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1945 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1946 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1947 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1948 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1950 Version 1.34.2 (2019-05-14)
1951 ===========================
1953 * [Destabilize the `Error::type_id` function due to a security
1954 vulnerability][60785] ([CVE-2019-12083])
1956 [60785]: https://github.com/rust-lang/rust/pull/60785
1957 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1959 Version 1.34.1 (2019-04-25)
1960 ===========================
1962 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1963 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1964 * [Fix Clippy panic when checking some macros][clippy/3805]
1966 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1967 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1968 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1970 Version 1.34.0 (2019-04-11)
1971 ==========================
1975 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1976 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1978 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1979 `#[attr{}]` procedural macros.][57367]
1980 - [You can now write `extern crate self as foo;`][57407] to import your
1981 crate's root into the extern prelude.
1986 - [You can now target `riscv64imac-unknown-none-elf` and
1987 `riscv64gc-unknown-none-elf`.][58406]
1988 - [You can now enable linker plugin LTO optimisations with
1989 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1990 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1992 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1997 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1998 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1999 the `Hash` trait to create an iterator.
2000 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2001 methods.][58421] Most notably you no longer require the `Ord` trait to create
2003 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2004 for all numeric types.][58044]
2005 - [Indexing a `str` is now generic over all types that
2006 implement `SliceIndex<str>`.][57604]
2007 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2008 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2009 produce a warning if their returning type is unused.
2010 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2011 `overflowing_pow` are now available for all numeric types.][57873] These are
2012 equivalent to methods such as `wrapping_add` for the `pow` operation.
2020 * [`Error::type_id`]
2021 * [`atomic::AtomicI16`]
2022 * [`atomic::AtomicI32`]
2023 * [`atomic::AtomicI64`]
2024 * [`atomic::AtomicI8`]
2025 * [`atomic::AtomicU16`]
2026 * [`atomic::AtomicU32`]
2027 * [`atomic::AtomicU64`]
2028 * [`atomic::AtomicU8`]
2029 * [`convert::Infallible`]
2030 * [`convert::TryFrom`]
2031 * [`convert::TryInto`]
2033 * [`iter::successors`]
2034 * [`num::NonZeroI128`]
2035 * [`num::NonZeroI16`]
2036 * [`num::NonZeroI32`]
2037 * [`num::NonZeroI64`]
2038 * [`num::NonZeroI8`]
2039 * [`num::NonZeroIsize`]
2040 * [`slice::sort_by_cached_key`]
2041 * [`str::escape_debug`]
2042 * [`str::escape_default`]
2043 * [`str::escape_unicode`]
2044 * [`str::split_ascii_whitespace`]
2047 * [`Instant::checked_add`]
2048 * [`Instant::checked_sub`]
2049 * [`SystemTime::checked_add`]
2050 * [`SystemTime::checked_sub`]
2054 - [You can now use alternative registries to crates.io.][cargo/6654]
2058 - [You can now use the `?` operator in your documentation tests without manually
2059 adding `fn main() -> Result<(), _> {}`.][56470]
2063 - [`Command::before_exec` is being replaced by the unsafe method
2064 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2065 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2066 can now use `const` functions in `static` variables.
2068 [58370]: https://github.com/rust-lang/rust/pull/58370/
2069 [58406]: https://github.com/rust-lang/rust/pull/58406/
2070 [58421]: https://github.com/rust-lang/rust/pull/58421/
2071 [58166]: https://github.com/rust-lang/rust/pull/58166/
2072 [58044]: https://github.com/rust-lang/rust/pull/58044/
2073 [58057]: https://github.com/rust-lang/rust/pull/58057/
2074 [58059]: https://github.com/rust-lang/rust/pull/58059/
2075 [57809]: https://github.com/rust-lang/rust/pull/57809/
2076 [57873]: https://github.com/rust-lang/rust/pull/57873/
2077 [57604]: https://github.com/rust-lang/rust/pull/57604/
2078 [57367]: https://github.com/rust-lang/rust/pull/57367/
2079 [57407]: https://github.com/rust-lang/rust/pull/57407/
2080 [57425]: https://github.com/rust-lang/rust/pull/57425/
2081 [57106]: https://github.com/rust-lang/rust/pull/57106/
2082 [56470]: https://github.com/rust-lang/rust/pull/56470/
2083 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2084 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2085 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2086 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2087 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2088 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2089 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2090 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2091 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2092 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2093 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2094 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2095 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2096 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2097 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2098 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2099 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2100 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2101 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2102 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2103 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2104 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2105 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2106 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2107 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2108 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2109 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2110 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2111 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2112 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2113 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2116 Version 1.33.0 (2019-02-28)
2117 ==========================
2121 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2122 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2123 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2124 E.g. You can have match statement on a `u8` that covers `0..=255` and
2125 you would no longer be required to have a `_ => unreachable!()` case.
2126 - [You can now have multiple patterns in `if let` and `while let`
2127 expressions.][57532] You can do this with the same syntax as a `match`
2137 let state = Creature::Crab("Ferris");
2139 if let Creature::Crab(name) | Creature::Person(name) = state {
2140 println!("This creature's name is: {}", name);
2144 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2145 this feature will by default produce a warning as this behaviour can be
2146 unintuitive. E.g. `if let _ = 5 {}`
2147 - [You can now use `let` bindings, assignments, expression statements,
2148 and irrefutable pattern destructuring in const functions.][57175]
2149 - [You can now call unsafe const functions.][57067] E.g.
2151 const unsafe fn foo() -> i32 { 5 }
2152 const fn bar() -> i32 {
2156 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2157 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2158 - [You can now specify a specific alignment with the `#[repr(packed)]`
2159 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2160 with an alignment of 2 bytes and a size of 6 bytes.
2161 - [You can now import an item from a module as an `_`.][56303] This allows you to
2162 import a trait's impls, and not have the name in the namespace. E.g.
2164 use std::io::Read as _;
2166 // Allowed as there is only one `Read` in the module.
2169 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2173 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2174 command line argument.][56351]
2175 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2176 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2177 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2178 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2179 information on Rust's platform support.
2180 - [Added support for the `thumbv7neon-linux-androideabi` and
2181 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2182 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2186 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2187 functions for all numeric types.][57566]
2188 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2189 are now `const` functions for all numeric types.][57105]
2190 - [The methods `is_positive` and `is_negative` are now `const` functions for
2191 all signed numeric types.][57105]
2192 - [The `get` method for all `NonZero` types is now `const`.][57167]
2193 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2194 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2195 numeric types.][57234]
2196 - [`Ipv4Addr::new` is now a `const` function][57234]
2200 - [`unix::FileExt::read_exact_at`]
2201 - [`unix::FileExt::write_all_at`]
2202 - [`Option::transpose`]
2203 - [`Result::transpose`]
2204 - [`convert::identity`]
2207 - [`marker::PhantomPinned`]
2208 - [`Vec::resize_with`]
2209 - [`VecDeque::resize_with`]
2210 - [`Duration::as_millis`]
2211 - [`Duration::as_micros`]
2212 - [`Duration::as_nanos`]
2217 - [You can now publish crates that require a feature flag to compile with
2218 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2219 - [Cargo should now rebuild a crate if a file was modified during the initial
2224 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2225 are now deprecated in the standard library, and their usage will now produce a warning.
2226 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2228 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2230 - [Libtest no longer creates a new thread for each test when
2231 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2233 [55982]: https://github.com/rust-lang/rust/pull/55982/
2234 [56243]: https://github.com/rust-lang/rust/pull/56243
2235 [56303]: https://github.com/rust-lang/rust/pull/56303/
2236 [56351]: https://github.com/rust-lang/rust/pull/56351/
2237 [56362]: https://github.com/rust-lang/rust/pull/56362
2238 [56642]: https://github.com/rust-lang/rust/pull/56642/
2239 [56769]: https://github.com/rust-lang/rust/pull/56769/
2240 [56805]: https://github.com/rust-lang/rust/pull/56805
2241 [56947]: https://github.com/rust-lang/rust/pull/56947/
2242 [57049]: https://github.com/rust-lang/rust/pull/57049/
2243 [57067]: https://github.com/rust-lang/rust/pull/57067/
2244 [57105]: https://github.com/rust-lang/rust/pull/57105
2245 [57130]: https://github.com/rust-lang/rust/pull/57130/
2246 [57167]: https://github.com/rust-lang/rust/pull/57167/
2247 [57175]: https://github.com/rust-lang/rust/pull/57175/
2248 [57234]: https://github.com/rust-lang/rust/pull/57234/
2249 [57332]: https://github.com/rust-lang/rust/pull/57332/
2250 [57465]: https://github.com/rust-lang/rust/pull/57465/
2251 [57532]: https://github.com/rust-lang/rust/pull/57532/
2252 [57535]: https://github.com/rust-lang/rust/pull/57535/
2253 [57566]: https://github.com/rust-lang/rust/pull/57566/
2254 [57615]: https://github.com/rust-lang/rust/pull/57615/
2255 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2256 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2257 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2258 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2259 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2260 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2261 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2262 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2263 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2264 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2265 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2266 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2267 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2268 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2269 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2270 [platform-support]: https://forge.rust-lang.org/platform-support.html
2272 Version 1.32.0 (2019-01-17)
2273 ==========================
2278 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2279 operator allows you to specify zero or one repetitions similar to the `*` and
2281 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2282 now always resolve to the item (`enum`, `struct`, etc.) available in the
2283 module if present, before resolving to a external crate or an item the prelude.][56759]
2286 enum Color { Red, Green, Blue }
2292 - [You can now match against `PhantomData<T>` types.][55837]
2293 - [You can now match against literals in macros with the `literal`
2294 specifier.][56072] This will match against a literal of any type.
2295 E.g. `1`, `'A'`, `"Hello World"`
2296 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2298 struct Point(i32, i32);
2301 pub fn new(x: i32, y: i32) -> Self {
2305 pub fn is_origin(&self) -> bool {
2313 - [Self can also now be used in type definitions.][56366] E.g.
2317 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2320 Cons(T, Box<Self>) // likewise here
2323 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2324 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2328 - [The default allocator has changed from jemalloc to the default allocator on
2329 your system.][55238] The compiler itself on Linux & macOS will still use
2330 jemalloc, but programs compiled with it will use the system allocator.
2331 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2335 - [`PathBuf` now implements `FromStr`.][55148]
2336 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2337 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2338 easily debug expressions in your rust program. E.g.
2341 let b = dbg!(a * 2) + 1;
2342 // ^-- prints: [src/main.rs:4] a * 2 = 4
2346 The following APIs are now `const` functions and can be used in a
2350 - [`UnsafeCell::get`]
2351 - [`char::is_ascii`]
2353 - [`ManuallyDrop::new`]
2354 - [`ManuallyDrop::into_inner`]
2355 - [`RangeInclusive::start`]
2356 - [`RangeInclusive::end`]
2357 - [`NonNull::as_ptr`]
2360 - [`Duration::as_secs`]
2361 - [`Duration::subsec_millis`]
2362 - [`Duration::subsec_micros`]
2363 - [`Duration::subsec_nanos`]
2365 - [`Ipv4Addr::is_unspecified`]
2367 - [`Ipv6Addr::octets`]
2371 - [`i8::to_be_bytes`]
2372 - [`i8::to_le_bytes`]
2373 - [`i8::to_ne_bytes`]
2374 - [`i8::from_be_bytes`]
2375 - [`i8::from_le_bytes`]
2376 - [`i8::from_ne_bytes`]
2377 - [`i16::to_be_bytes`]
2378 - [`i16::to_le_bytes`]
2379 - [`i16::to_ne_bytes`]
2380 - [`i16::from_be_bytes`]
2381 - [`i16::from_le_bytes`]
2382 - [`i16::from_ne_bytes`]
2383 - [`i32::to_be_bytes`]
2384 - [`i32::to_le_bytes`]
2385 - [`i32::to_ne_bytes`]
2386 - [`i32::from_be_bytes`]
2387 - [`i32::from_le_bytes`]
2388 - [`i32::from_ne_bytes`]
2389 - [`i64::to_be_bytes`]
2390 - [`i64::to_le_bytes`]
2391 - [`i64::to_ne_bytes`]
2392 - [`i64::from_be_bytes`]
2393 - [`i64::from_le_bytes`]
2394 - [`i64::from_ne_bytes`]
2395 - [`i128::to_be_bytes`]
2396 - [`i128::to_le_bytes`]
2397 - [`i128::to_ne_bytes`]
2398 - [`i128::from_be_bytes`]
2399 - [`i128::from_le_bytes`]
2400 - [`i128::from_ne_bytes`]
2401 - [`isize::to_be_bytes`]
2402 - [`isize::to_le_bytes`]
2403 - [`isize::to_ne_bytes`]
2404 - [`isize::from_be_bytes`]
2405 - [`isize::from_le_bytes`]
2406 - [`isize::from_ne_bytes`]
2407 - [`u8::to_be_bytes`]
2408 - [`u8::to_le_bytes`]
2409 - [`u8::to_ne_bytes`]
2410 - [`u8::from_be_bytes`]
2411 - [`u8::from_le_bytes`]
2412 - [`u8::from_ne_bytes`]
2413 - [`u16::to_be_bytes`]
2414 - [`u16::to_le_bytes`]
2415 - [`u16::to_ne_bytes`]
2416 - [`u16::from_be_bytes`]
2417 - [`u16::from_le_bytes`]
2418 - [`u16::from_ne_bytes`]
2419 - [`u32::to_be_bytes`]
2420 - [`u32::to_le_bytes`]
2421 - [`u32::to_ne_bytes`]
2422 - [`u32::from_be_bytes`]
2423 - [`u32::from_le_bytes`]
2424 - [`u32::from_ne_bytes`]
2425 - [`u64::to_be_bytes`]
2426 - [`u64::to_le_bytes`]
2427 - [`u64::to_ne_bytes`]
2428 - [`u64::from_be_bytes`]
2429 - [`u64::from_le_bytes`]
2430 - [`u64::from_ne_bytes`]
2431 - [`u128::to_be_bytes`]
2432 - [`u128::to_le_bytes`]
2433 - [`u128::to_ne_bytes`]
2434 - [`u128::from_be_bytes`]
2435 - [`u128::from_le_bytes`]
2436 - [`u128::from_ne_bytes`]
2437 - [`usize::to_be_bytes`]
2438 - [`usize::to_le_bytes`]
2439 - [`usize::to_ne_bytes`]
2440 - [`usize::from_be_bytes`]
2441 - [`usize::from_le_bytes`]
2442 - [`usize::from_ne_bytes`]
2446 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2447 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2451 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2455 - [The argument types for AVX's
2456 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2457 been changed from `*const` to `*mut` as the previous implementation
2461 [55148]: https://github.com/rust-lang/rust/pull/55148/
2462 [55238]: https://github.com/rust-lang/rust/pull/55238/
2463 [55280]: https://github.com/rust-lang/rust/pull/55280/
2464 [55610]: https://github.com/rust-lang/rust/pull/55610/
2465 [55663]: https://github.com/rust-lang/rust/pull/55663/
2466 [55702]: https://github.com/rust-lang/rust/pull/55702/
2467 [55837]: https://github.com/rust-lang/rust/pull/55837/
2468 [55843]: https://github.com/rust-lang/rust/pull/55843/
2469 [56072]: https://github.com/rust-lang/rust/pull/56072/
2470 [56245]: https://github.com/rust-lang/rust/pull/56245/
2471 [56365]: https://github.com/rust-lang/rust/pull/56365/
2472 [56366]: https://github.com/rust-lang/rust/pull/56366/
2473 [56395]: https://github.com/rust-lang/rust/pull/56395/
2474 [56759]: https://github.com/rust-lang/rust/pull/56759/
2475 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2476 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2477 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2478 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2479 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2480 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2481 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2482 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2483 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2484 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2485 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2486 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2487 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2488 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2489 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2490 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2491 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2492 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2493 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2494 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2495 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2496 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2497 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2498 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2499 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2500 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2501 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2502 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2503 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2504 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2505 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2506 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2507 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2508 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2509 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2510 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2511 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2512 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2513 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2514 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2515 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2516 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2517 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2518 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2519 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2520 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2521 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2522 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2523 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2524 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2525 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2526 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2527 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2528 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2529 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2530 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2531 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2532 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2533 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2534 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2535 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2536 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2537 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2538 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2539 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2540 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2541 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2542 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2543 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2544 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2545 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2546 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2547 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2548 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2549 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2550 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2551 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2552 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2553 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2554 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2555 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2556 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2557 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2558 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2559 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2560 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2561 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2562 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2563 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2564 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2565 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2566 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2567 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2570 Version 1.31.1 (2018-12-20)
2571 ===========================
2573 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2574 - [Fix broken go-to-definition in RLS][rls/1171]
2575 - [Fix infinite loop on hover in RLS][rls/1170]
2577 [56562]: https://github.com/rust-lang/rust/pull/56562
2578 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2579 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2581 Version 1.31.0 (2018-12-06)
2582 ==========================
2586 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2587 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2588 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2589 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2591 - [You can now define and use `const` functions.][54835] These are currently
2592 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2593 [language reference][const-reference] for what exactly is available.
2594 - [You can now use tool lints, which allow you to scope lints from external
2595 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2596 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2597 a crate, not just in exported functions.][54451]
2598 - [You can now use parentheses in pattern matches.][54497]
2602 - [Updated musl to 1.1.20][54430]
2606 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2607 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2608 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2609 into `Option<&mut T>` using the `From` trait.][53218]
2610 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2615 - [`slice::align_to`]
2616 - [`slice::align_to_mut`]
2617 - [`slice::chunks_exact`]
2618 - [`slice::chunks_exact_mut`]
2619 - [`slice::rchunks`]
2620 - [`slice::rchunks_mut`]
2621 - [`slice::rchunks_exact`]
2622 - [`slice::rchunks_exact_mut`]
2623 - [`Option::replace`]
2627 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2628 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2629 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2631 [52813]: https://github.com/rust-lang/rust/pull/52813/
2632 [53218]: https://github.com/rust-lang/rust/pull/53218/
2633 [53555]: https://github.com/rust-lang/rust/issues/53555/
2634 [54057]: https://github.com/rust-lang/rust/pull/54057/
2635 [54240]: https://github.com/rust-lang/rust/pull/54240/
2636 [54430]: https://github.com/rust-lang/rust/pull/54430/
2637 [54451]: https://github.com/rust-lang/rust/pull/54451/
2638 [54497]: https://github.com/rust-lang/rust/pull/54497/
2639 [54778]: https://github.com/rust-lang/rust/pull/54778/
2640 [54835]: https://github.com/rust-lang/rust/pull/54835/
2641 [54870]: https://github.com/rust-lang/rust/pull/54870/
2642 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2643 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2644 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2645 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2646 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2647 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2648 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2649 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2650 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2651 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2652 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2653 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2654 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2655 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2657 Version 1.30.1 (2018-11-08)
2658 ===========================
2660 - [Fixed overflow ICE in rustdoc][54199]
2661 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2663 [54199]: https://github.com/rust-lang/rust/pull/54199
2664 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2666 Version 1.30.0 (2018-10-25)
2667 ==========================
2671 - [Procedural macros are now available.][52081] These kinds of macros allow for
2672 more powerful code generation. There is a [new chapter available][proc-macros]
2673 in the Rust Programming Language book that goes further in depth.
2674 - [You can now use keywords as identifiers using the raw identifiers
2675 syntax (`r#`),][53236] e.g. `let r#for = true;`
2676 - [Using anonymous parameters in traits is now deprecated with a warning and
2677 will be a hard error in the 2018 edition.][53272]
2678 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2679 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2680 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2681 Previously, using a external crate in a module without a use statement
2682 required `let json = ::serde_json::from_str(foo);` but can now be written
2683 as `let json = serde_json::from_str(foo);`.
2684 - [You can now apply the `#[used]` attribute to static items to prevent the
2685 compiler from optimising them away, even if they appear to be unused,][51363]
2686 e.g. `#[used] static FOO: u32 = 1;`
2687 - [You can now import and reexport macros from other crates with the `use`
2688 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2689 the root module of the crate. If your macro relies on calling other local
2690 macros, it is recommended to export with the
2691 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2693 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2694 using the `vis` specifier.][53370]
2695 - [Non-macro attributes now allow all forms of literals, not just
2696 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2697 write `#[attr(true)]`.
2698 - [You can now specify a function to handle a panic in the Rust runtime with the
2699 `#[panic_handler]` attribute.][51366]
2703 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2704 - [Added the `aarch64-unknown-netbsd` target][53165]
2705 - [Upgraded to LLVM 8.][53611]
2709 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2713 - [`Ipv4Addr::BROADCAST`]
2714 - [`Ipv4Addr::LOCALHOST`]
2715 - [`Ipv4Addr::UNSPECIFIED`]
2716 - [`Ipv6Addr::LOCALHOST`]
2717 - [`Ipv6Addr::UNSPECIFIED`]
2718 - [`Iterator::find_map`]
2720 The following methods are replacement methods for `trim_left`, `trim_right`,
2721 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2723 - [`str::trim_end_matches`]
2725 - [`str::trim_start_matches`]
2726 - [`str::trim_start`]
2730 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2731 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2732 equivalent to calling `rustdoc --error-format=json`.
2733 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2737 - [`rustdoc` allows you to specify what edition to treat your code as with the
2738 `--edition` option.][54057]
2739 - [`rustdoc` now has the `--color` (specify whether to output color) and
2740 `--error-format` (specify error format, e.g. `json`) options.][53003]
2741 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2742 debug symbols.][53774]
2743 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2744 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2746 [50911]: https://github.com/rust-lang/rust/pull/50911/
2747 [51363]: https://github.com/rust-lang/rust/pull/51363/
2748 [51366]: https://github.com/rust-lang/rust/pull/51366/
2749 [52081]: https://github.com/rust-lang/rust/pull/52081/
2750 [53003]: https://github.com/rust-lang/rust/pull/53003/
2751 [53033]: https://github.com/rust-lang/rust/pull/53033/
2752 [53044]: https://github.com/rust-lang/rust/pull/53044/
2753 [53165]: https://github.com/rust-lang/rust/pull/53165/
2754 [53611]: https://github.com/rust-lang/rust/pull/53611/
2755 [53213]: https://github.com/rust-lang/rust/pull/53213/
2756 [53236]: https://github.com/rust-lang/rust/pull/53236/
2757 [53272]: https://github.com/rust-lang/rust/pull/53272/
2758 [53370]: https://github.com/rust-lang/rust/pull/53370/
2759 [53459]: https://github.com/rust-lang/rust/pull/53459/
2760 [53774]: https://github.com/rust-lang/rust/pull/53774/
2761 [53822]: https://github.com/rust-lang/rust/pull/53822/
2762 [54057]: https://github.com/rust-lang/rust/pull/54057/
2763 [54146]: https://github.com/rust-lang/rust/pull/54146/
2764 [54404]: https://github.com/rust-lang/rust/pull/54404/
2765 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2766 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2767 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2768 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2770 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2771 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2772 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2773 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2774 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2775 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2776 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2777 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2778 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2779 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2782 Version 1.29.2 (2018-10-11)
2783 ===========================
2785 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2786 - The `rls-preview` component on the windows-gnu targets has been restored.
2788 [54639]: https://github.com/rust-lang/rust/pull/54639
2791 Version 1.29.1 (2018-09-25)
2792 ===========================
2797 - The standard library's `str::repeat` function contained an out of bounds write
2798 caused by an integer overflow. This has been fixed by deterministically
2799 panicking when an overflow happens.
2801 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2805 Version 1.29.0 (2018-09-13)
2806 ==========================
2810 - [Bumped minimum LLVM version to 5.0.][51899]
2811 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2812 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2813 - [Upgraded to LLVM 7.][51966]
2817 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2818 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2819 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2820 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2822 - [`Cell<T>` now allows `T` to be unsized.][50494]
2823 - [`SocketAddr` is now stable on Redox.][52656]
2828 - [`Iterator::flatten`]
2833 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2834 `--locked` to disable this behavior.
2835 - [`cargo-install` will now allow you to cross compile an install
2836 using `--target`.][cargo/5614]
2837 - [Added the `cargo-fix` subcommand to automatically move project code from
2838 2015 edition to 2018.][cargo/5723]
2839 - [`cargo doc` can now optionally document private types using the
2840 `--document-private-items` flag.][cargo/5543]
2844 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2845 the specified level to that level.][52354] For example `--cap-lints warn`
2846 will demote `deny` and `forbid` lints to `warn`.
2847 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2848 fails and `101` if there is a panic.][52197]
2849 - [A preview of clippy has been made available through rustup.][51122]
2850 You can install the preview with `rustup component add clippy-preview`.
2854 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2855 Use `str::get_unchecked(begin..end)` instead.
2856 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2857 Consider using the `home_dir` function from
2858 https://crates.io/crates/dirs instead.
2859 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2860 - [`cfg` attributes and `--cfg` command line flags are now more
2861 strictly validated.][53893]
2863 [53893]: https://github.com/rust-lang/rust/pull/53893/
2864 [52861]: https://github.com/rust-lang/rust/pull/52861/
2865 [51966]: https://github.com/rust-lang/rust/pull/51966/
2866 [52656]: https://github.com/rust-lang/rust/pull/52656/
2867 [52239]: https://github.com/rust-lang/rust/pull/52239/
2868 [52330]: https://github.com/rust-lang/rust/pull/52330/
2869 [52354]: https://github.com/rust-lang/rust/pull/52354/
2870 [52402]: https://github.com/rust-lang/rust/pull/52402/
2871 [52103]: https://github.com/rust-lang/rust/pull/52103/
2872 [52197]: https://github.com/rust-lang/rust/pull/52197/
2873 [51807]: https://github.com/rust-lang/rust/pull/51807/
2874 [51899]: https://github.com/rust-lang/rust/pull/51899/
2875 [51912]: https://github.com/rust-lang/rust/pull/51912/
2876 [51511]: https://github.com/rust-lang/rust/pull/51511/
2877 [51619]: https://github.com/rust-lang/rust/pull/51619/
2878 [51656]: https://github.com/rust-lang/rust/pull/51656/
2879 [51178]: https://github.com/rust-lang/rust/pull/51178/
2880 [51122]: https://github.com/rust-lang/rust/pull/51122
2881 [50494]: https://github.com/rust-lang/rust/pull/50494/
2882 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2883 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2884 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2885 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2886 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2887 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2888 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2891 Version 1.28.0 (2018-08-02)
2892 ===========================
2896 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2897 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2898 the inner type across Foreign Function Interface (FFI) boundaries.
2899 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2900 and can now be used as identifiers.][51196]
2901 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2902 stable.][51241] This will allow users to specify a global allocator for
2904 - [Unit test functions marked with the `#[test]` attribute can now return
2905 `Result<(), E: Debug>` in addition to `()`.][51298]
2906 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2907 allows macros to easily target lifetimes.
2911 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2912 prioritise making smaller binary sizes. `z` is the same as `s` with the
2913 exception that it does not vectorise loops, which typically results in an even
2915 - [The short error format is now stable.][49546] Specified with
2916 `--error-format=short` this option will provide a more compressed output of
2917 rust error messages.
2918 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2919 - [Reduced the number of allocations in the macro parser.][50855] This can
2920 improve compile times of macro heavy crates on average by 5%.
2924 - [Implemented `Default` for `&mut str`.][51306]
2925 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2926 - [Implemented `Extend` for `()`.][50234]
2927 - [The `Debug` implementation of `time::Duration` should now be more easily
2928 human readable.][50364] Previously a `Duration` of one second would printed as
2929 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2930 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2931 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2932 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2933 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2934 for `PathBuf`.][50170]
2935 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2936 and `Wrapping<i128>`.][50465]
2937 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2938 possible.][51050] This can provide up to a 40% speed increase.
2939 - [Improved error messages when using `format!`.][50610]
2943 - [`Iterator::step_by`]
2944 - [`Path::ancestors`]
2945 - [`SystemTime::UNIX_EPOCH`]
2946 - [`alloc::GlobalAlloc`]
2948 - [`alloc::LayoutErr`]
2951 - [`alloc::alloc_zeroed`]
2952 - [`alloc::dealloc`]
2953 - [`alloc::realloc`]
2954 - [`alloc::handle_alloc_error`]
2955 - [`btree_map::Entry::or_default`]
2956 - [`fmt::Alignment`]
2957 - [`hash_map::Entry::or_default`]
2958 - [`iter::repeat_with`]
2959 - [`num::NonZeroUsize`]
2960 - [`num::NonZeroU128`]
2961 - [`num::NonZeroU16`]
2962 - [`num::NonZeroU32`]
2963 - [`num::NonZeroU64`]
2964 - [`num::NonZeroU8`]
2965 - [`ops::RangeBounds`]
2966 - [`slice::SliceIndex`]
2967 - [`slice::from_mut`]
2968 - [`slice::from_ref`]
2969 - [`{Any + Send + Sync}::downcast_mut`]
2970 - [`{Any + Send + Sync}::downcast_ref`]
2971 - [`{Any + Send + Sync}::is`]
2975 - [Cargo will now no longer allow you to publish crates with build scripts that
2976 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2977 considered to be immutable.
2981 - [The `suggestion_applicability` field in `rustc`'s json output is now
2982 stable.][50486] This will allow dev tools to check whether a code suggestion
2983 would apply to them.
2987 - [Rust will consider trait objects with duplicated constraints to be the same
2988 type as without the duplicated constraint.][51276] For example the below code will
2989 now fail to compile.
2994 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2997 impl Trait + Send + Send {
2998 fn test(&self) { println!("two"); }
3002 [49546]: https://github.com/rust-lang/rust/pull/49546/
3003 [50143]: https://github.com/rust-lang/rust/pull/50143/
3004 [50170]: https://github.com/rust-lang/rust/pull/50170/
3005 [50234]: https://github.com/rust-lang/rust/pull/50234/
3006 [50265]: https://github.com/rust-lang/rust/pull/50265/
3007 [50364]: https://github.com/rust-lang/rust/pull/50364/
3008 [50385]: https://github.com/rust-lang/rust/pull/50385/
3009 [50465]: https://github.com/rust-lang/rust/pull/50465/
3010 [50486]: https://github.com/rust-lang/rust/pull/50486/
3011 [50554]: https://github.com/rust-lang/rust/pull/50554/
3012 [50610]: https://github.com/rust-lang/rust/pull/50610/
3013 [50855]: https://github.com/rust-lang/rust/pull/50855/
3014 [51050]: https://github.com/rust-lang/rust/pull/51050/
3015 [51196]: https://github.com/rust-lang/rust/pull/51196/
3016 [51200]: https://github.com/rust-lang/rust/pull/51200/
3017 [51241]: https://github.com/rust-lang/rust/pull/51241/
3018 [51276]: https://github.com/rust-lang/rust/pull/51276/
3019 [51298]: https://github.com/rust-lang/rust/pull/51298/
3020 [51306]: https://github.com/rust-lang/rust/pull/51306/
3021 [51562]: https://github.com/rust-lang/rust/pull/51562/
3022 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3023 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3024 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3025 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3026 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3027 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3028 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3029 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3030 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3031 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3032 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3033 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3034 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3035 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3036 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3037 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3038 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3039 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3040 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3041 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3042 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3043 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3044 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3045 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3046 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3047 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3048 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3049 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3050 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3051 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3053 Version 1.27.2 (2018-07-20)
3054 ===========================
3059 - The borrow checker was fixed to avoid potential unsoundness when using
3060 match ergonomics: [#52213][52213].
3062 [52213]: https://github.com/rust-lang/rust/issues/52213
3064 Version 1.27.1 (2018-07-10)
3065 ===========================
3070 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3071 when running, which enabled executing code as some other user on a
3072 given machine. This release fixes that vulnerability; you can read
3073 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3075 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3080 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3081 match ergonomics: [#51415][51415], [#49534][49534].
3083 [51415]: https://github.com/rust-lang/rust/issues/51415
3084 [49534]: https://github.com/rust-lang/rust/issues/49534
3085 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3086 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3088 Version 1.27.0 (2018-06-21)
3089 ==========================
3093 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3094 be used as an identifier.
3095 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3096 bare `Trait` syntax, and should make it clearer when being used in tandem with
3097 `impl Trait` because it is equivalent to the following syntax:
3098 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3099 `Box<Trait> == Box<dyn Trait>`.
3100 - [Attributes on generic parameters such as types and lifetimes are
3101 now stable.][48851] e.g.
3102 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3103 - [The `#[must_use]` attribute can now also be used on functions as well as
3104 types.][48925] It provides a lint that by default warns users when the
3105 value returned by a function has not been used.
3109 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3113 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3114 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3115 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3116 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3117 the `cfg` attribute.
3118 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3119 std are now available in core.][49896]
3120 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3122 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3123 that the operation isn't done in place.
3124 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3125 the `#[must_use]` attribute][49533] to warn about unused potentially
3126 expensive allocations.
3130 - [`DoubleEndedIterator::rfind`]
3131 - [`DoubleEndedIterator::rfold`]
3132 - [`DoubleEndedIterator::try_rfold`]
3133 - [`Duration::from_micros`]
3134 - [`Duration::from_nanos`]
3135 - [`Duration::subsec_micros`]
3136 - [`Duration::subsec_millis`]
3137 - [`HashMap::remove_entry`]
3138 - [`Iterator::try_fold`]
3139 - [`Iterator::try_for_each`]
3141 - [`Option::filter`]
3142 - [`String::replace_range`]
3143 - [`Take::set_limit`]
3144 - [`hint::unreachable_unchecked`]
3145 - [`os::unix::process::parent_id`]
3146 - [`ptr::swap_nonoverlapping`]
3147 - [`slice::rsplit_mut`]
3149 - [`slice::swap_with_slice`]
3153 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3154 `readme`, and `repository` fields.][cargo/5386]
3155 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3156 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3157 a different directory than `target` for placing compilation artifacts.
3158 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3159 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3160 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3161 where cargo would infer a binary, Cargo will produce a warning. You can
3162 disable this feature ahead of time by setting any of the following to false:
3163 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3164 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3165 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3169 - [Added “The Rustc book” into the official documentation.][49707]
3170 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3171 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3175 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3176 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3177 compile, `"".is_empty()` will still compile.
3178 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3179 will only print the inner type.][48553] E.g.
3180 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3181 not `AtomicBool(true)`.
3182 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3183 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3184 alignment should cover all use cases.
3185 - The `.description()` method on the `std::error::Error` trait
3186 [has been soft-deprecated][50163]. It is no longer required to implement it.
3188 [48553]: https://github.com/rust-lang/rust/pull/48553/
3189 [48851]: https://github.com/rust-lang/rust/pull/48851/
3190 [48925]: https://github.com/rust-lang/rust/pull/48925/
3191 [49533]: https://github.com/rust-lang/rust/pull/49533/
3192 [49623]: https://github.com/rust-lang/rust/pull/49623/
3193 [49630]: https://github.com/rust-lang/rust/pull/49630/
3194 [49664]: https://github.com/rust-lang/rust/pull/49664/
3195 [49699]: https://github.com/rust-lang/rust/pull/49699/
3196 [49707]: https://github.com/rust-lang/rust/pull/49707/
3197 [49719]: https://github.com/rust-lang/rust/pull/49719/
3198 [49896]: https://github.com/rust-lang/rust/pull/49896/
3199 [49968]: https://github.com/rust-lang/rust/pull/49968/
3200 [50163]: https://github.com/rust-lang/rust/pull/50163
3201 [50177]: https://github.com/rust-lang/rust/pull/50177/
3202 [50378]: https://github.com/rust-lang/rust/pull/50378/
3203 [50398]: https://github.com/rust-lang/rust/pull/50398/
3204 [50423]: https://github.com/rust-lang/rust/pull/50423/
3205 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3206 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3207 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3208 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3209 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3210 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3211 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3212 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3213 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3214 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3215 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3216 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3217 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3218 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3219 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3220 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3221 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3222 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3223 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3224 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3225 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3226 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3227 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3228 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3229 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3230 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3231 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3232 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3233 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3234 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3237 Version 1.26.2 (2018-06-05)
3238 ==========================
3243 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3245 [51117]: https://github.com/rust-lang/rust/issues/51117
3248 Version 1.26.1 (2018-05-29)
3249 ==========================
3254 - [RLS now works on Windows.][50646]
3255 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3261 - [`fn main() -> impl Trait` no longer works for non-Termination
3263 This reverts an accidental stabilization.
3264 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3265 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3267 [50646]: https://github.com/rust-lang/rust/issues/50646
3268 [50656]: https://github.com/rust-lang/rust/pull/50656
3269 [50812]: https://github.com/rust-lang/rust/pull/50812
3270 [50950]: https://github.com/rust-lang/rust/issues/50950
3271 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3273 Version 1.26.0 (2018-05-10)
3274 ==========================
3278 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3279 implement either or both traits.][49299]
3280 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3281 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3282 lifetime can be elided.][49458]
3283 - [`impl Trait` is now stable allowing you to have abstract types in returns
3284 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3285 `fn open(path: impl AsRef<Path>)`.
3286 - [Pattern matching will now automatically apply dereferences.][49394]
3287 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3288 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3289 - [A lot of operations are now available in a const context.][46882] E.g. You
3290 can now index into constant arrays, reference and dereference into constants,
3291 and use tuple struct constructors.
3292 - [Fixed entry slice patterns are now stable.][48516] E.g.
3294 let points = [1, 2, 3, 4];
3296 [1, 2, 3, 4] => println!("All points were sequential."),
3297 _ => println!("Not all points were sequential."),
3304 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3305 - [Fixed exponential projection complexity on nested types.][48296]
3306 This can provide up to a ~12% reduction in compile times for certain crates.
3307 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3308 to remap path prefixes outputted by the compiler.
3309 - [Added `powerpc-unknown-netbsd` target.][48281]
3313 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3314 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3315 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3316 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3317 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3318 - [`ascii::escape_default` is now available in libcore.][48735]
3319 - [Trailing commas are now supported in std and core macros.][48056]
3320 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3321 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3326 - [`*const T::copy_to_nonoverlapping`]
3327 - [`*const T::copy_to`]
3328 - [`*const T::read_unaligned`]
3329 - [`*const T::read_volatile`]
3330 - [`*const T::read`]
3332 - [`*const T::wrapping_add`]
3333 - [`*const T::wrapping_sub`]
3335 - [`*mut T::copy_to_nonoverlapping`]
3336 - [`*mut T::copy_to`]
3337 - [`*mut T::read_unaligned`]
3338 - [`*mut T::read_volatile`]
3340 - [`*mut T::replace`]
3343 - [`*mut T::wrapping_add`]
3344 - [`*mut T::wrapping_sub`]
3345 - [`*mut T::write_bytes`]
3346 - [`*mut T::write_unaligned`]
3347 - [`*mut T::write_volatile`]
3350 - [`FromUtf8Error::as_bytes`]
3351 - [`LocalKey::try_with`]
3352 - [`Option::cloned`]
3353 - [`btree_map::Entry::and_modify`]
3354 - [`fs::read_to_string`]
3357 - [`hash_map::Entry::and_modify`]
3358 - [`iter::FusedIterator`]
3359 - [`ops::RangeInclusive`]
3360 - [`ops::RangeToInclusive`]
3362 - [`slice::rotate_left`]
3363 - [`slice::rotate_right`]
3364 - [`String::retain`]
3369 - [Cargo will now output path to custom commands when `-v` is
3370 passed with `--list`][cargo/5041]
3371 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3375 - [The second edition of "The Rust Programming Language" book is now recommended
3376 over the first.][48404]
3381 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3382 syntax is now invalid.
3384 use std::ops::Fn as dyn;
3385 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3387 - [The result of dereferences are no longer promoted to `'static`.][47408]
3391 const PAIR: &(i32, i32) = &(0, 1);
3392 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3395 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3396 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3398 - [Removed hoedown from rustdoc.][48274]
3399 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3401 [46882]: https://github.com/rust-lang/rust/pull/46882
3402 [47379]: https://github.com/rust-lang/rust/pull/47379
3403 [47408]: https://github.com/rust-lang/rust/pull/47408
3404 [47813]: https://github.com/rust-lang/rust/pull/47813
3405 [48056]: https://github.com/rust-lang/rust/pull/48056
3406 [48125]: https://github.com/rust-lang/rust/pull/48125
3407 [48166]: https://github.com/rust-lang/rust/pull/48166
3408 [48235]: https://github.com/rust-lang/rust/pull/48235
3409 [48274]: https://github.com/rust-lang/rust/pull/48274
3410 [48281]: https://github.com/rust-lang/rust/pull/48281
3411 [48296]: https://github.com/rust-lang/rust/pull/48296
3412 [48326]: https://github.com/rust-lang/rust/pull/48326
3413 [48359]: https://github.com/rust-lang/rust/pull/48359
3414 [48404]: https://github.com/rust-lang/rust/pull/48404
3415 [48481]: https://github.com/rust-lang/rust/pull/48481
3416 [48516]: https://github.com/rust-lang/rust/pull/48516
3417 [48628]: https://github.com/rust-lang/rust/pull/48628
3418 [48629]: https://github.com/rust-lang/rust/pull/48629
3419 [48657]: https://github.com/rust-lang/rust/pull/48657
3420 [48735]: https://github.com/rust-lang/rust/pull/48735
3421 [48978]: https://github.com/rust-lang/rust/pull/48978
3422 [49101]: https://github.com/rust-lang/rust/pull/49101
3423 [49109]: https://github.com/rust-lang/rust/pull/49109
3424 [49121]: https://github.com/rust-lang/rust/pull/49121
3425 [49162]: https://github.com/rust-lang/rust/pull/49162
3426 [49184]: https://github.com/rust-lang/rust/pull/49184
3427 [49234]: https://github.com/rust-lang/rust/pull/49234
3428 [49255]: https://github.com/rust-lang/rust/pull/49255
3429 [49299]: https://github.com/rust-lang/rust/pull/49299
3430 [49305]: https://github.com/rust-lang/rust/pull/49305
3431 [49394]: https://github.com/rust-lang/rust/pull/49394
3432 [49458]: https://github.com/rust-lang/rust/pull/49458
3433 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3434 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3435 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3436 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3437 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3438 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3439 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3440 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3441 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3442 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3443 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3444 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3445 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3446 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3447 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3448 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3449 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3450 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3451 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3452 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3453 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3454 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3455 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3456 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3457 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3458 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3459 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3460 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3461 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3462 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3463 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3464 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3465 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3466 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3467 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3468 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3469 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3470 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3471 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3472 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3473 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3474 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3477 Version 1.25.0 (2018-03-29)
3478 ==========================
3482 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3483 - [You can now use nested groups of imports.][47948]
3484 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3485 - [You can now have `|` at the start of a match arm.][47947] e.g.
3487 enum Foo { A, B, C }
3493 | Foo::B => println!("AB"),
3494 | Foo::C => println!("C"),
3501 - [Upgraded to LLVM 6.][47828]
3502 - [Added `-C lto=val` option.][47521]
3503 - [Added `i586-unknown-linux-musl` target][47282]
3507 - [Impl Send for `process::Command` on Unix.][47760]
3508 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3509 - [`UnsafeCell::into_inner` is now safe.][47204]
3510 - [Implement libstd for CloudABI.][47268]
3511 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3512 - [Implement `AsRef<Path>` for Component][46985]
3513 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3514 - [Moved `Duration` to libcore.][46666]
3518 - [`Location::column`]
3521 The following functions can now be used in a constant expression.
3522 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3523 - [`Duration::new`][47300]
3524 - [`Duration::from_secs`][47300]
3525 - [`Duration::from_millis`][47300]
3529 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3530 - [`cargo new` now defaults to creating a binary crate, instead of a
3531 library crate.][cargo/5029]
3535 - [Rust by example is now shipped with new releases][46196]
3539 - [Deprecated `net::lookup_host`.][47510]
3540 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3541 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3542 around indexing operations (see [#47349][47349]). This has been fixed (which also
3543 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3544 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3546 [33903]: https://github.com/rust-lang/rust/pull/33903
3547 [47947]: https://github.com/rust-lang/rust/pull/47947
3548 [47948]: https://github.com/rust-lang/rust/pull/47948
3549 [47760]: https://github.com/rust-lang/rust/pull/47760
3550 [47790]: https://github.com/rust-lang/rust/pull/47790
3551 [47828]: https://github.com/rust-lang/rust/pull/47828
3552 [47398]: https://github.com/rust-lang/rust/pull/47398
3553 [47510]: https://github.com/rust-lang/rust/pull/47510
3554 [47521]: https://github.com/rust-lang/rust/pull/47521
3555 [47204]: https://github.com/rust-lang/rust/pull/47204
3556 [47251]: https://github.com/rust-lang/rust/pull/47251
3557 [47268]: https://github.com/rust-lang/rust/pull/47268
3558 [47282]: https://github.com/rust-lang/rust/pull/47282
3559 [47300]: https://github.com/rust-lang/rust/pull/47300
3560 [47349]: https://github.com/rust-lang/rust/pull/47349
3561 [46931]: https://github.com/rust-lang/rust/pull/46931
3562 [46985]: https://github.com/rust-lang/rust/pull/46985
3563 [47006]: https://github.com/rust-lang/rust/pull/47006
3564 [46830]: https://github.com/rust-lang/rust/pull/46830
3565 [46095]: https://github.com/rust-lang/rust/pull/46095
3566 [46666]: https://github.com/rust-lang/rust/pull/46666
3567 [46196]: https://github.com/rust-lang/rust/pull/46196
3568 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3569 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3570 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3571 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3572 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3575 Version 1.24.1 (2018-03-01)
3576 ==========================
3578 - [Do not abort when unwinding through FFI][48251]
3579 - [Emit UTF-16 files for linker arguments on Windows][48318]
3580 - [Make the error index generator work again][48308]
3581 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3583 [48251]: https://github.com/rust-lang/rust/issues/48251
3584 [48308]: https://github.com/rust-lang/rust/issues/48308
3585 [48318]: https://github.com/rust-lang/rust/issues/48318
3586 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3589 Version 1.24.0 (2018-02-15)
3590 ==========================
3594 - [External `sysv64` ffi is now available.][46528]
3595 eg. `extern "sysv64" fn foo () {}`
3599 - [rustc now uses 16 codegen units by default for release builds.][46910]
3600 For the fastest builds, utilize `codegen-units=1`.
3601 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3602 - [Add `aarch64-unknown-openbsd` support][46760]
3606 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3607 improvement in performance in the majority of cases.
3608 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3609 with Windows.][46798]
3610 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3611 - [impl `From<bool>` for `AtomicBool`][46293]
3612 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3613 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3614 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3615 - [float::from_bits now just uses transmute.][46012] This provides
3616 some optimisations from LLVM.
3617 - [Copied `AsciiExt` methods onto `char`][46077]
3618 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3619 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3620 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3621 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3625 - [`RefCell::replace`]
3627 - [`atomic::spin_loop_hint`]
3629 The following functions can now be used in a constant expression.
3630 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3632 - [`AtomicBool::new`][46287]
3633 - [`AtomicUsize::new`][46287]
3634 - [`AtomicIsize::new`][46287]
3635 - [`AtomicPtr::new`][46287]
3636 - [`Cell::new`][46287]
3637 - [`{integer}::min_value`][46287]
3638 - [`{integer}::max_value`][46287]
3639 - [`mem::size_of`][46287]
3640 - [`mem::align_of`][46287]
3641 - [`ptr::null`][46287]
3642 - [`ptr::null_mut`][46287]
3643 - [`RefCell::new`][46287]
3644 - [`UnsafeCell::new`][46287]
3648 - [Added a `workspace.default-members` config that
3649 overrides implied `--all` in virtual workspaces.][cargo/4743]
3650 - [Enable incremental by default on development builds.][cargo/4817] Also added
3651 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3652 per-project or global basis respectively.
3659 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3660 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3661 in accordance with IETF RFC 4291 §2.2.
3662 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3663 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3664 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3665 - [Leading zeros in tuple struct members is now an error][47084]
3666 - [`column!()` macro is one-based instead of zero-based][46977]
3667 - [`fmt::Arguments` can no longer be shared across threads][45198]
3668 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3669 - [Cargo sets a different working directory for the compiler][cargo/4788]
3671 [44884]: https://github.com/rust-lang/rust/pull/44884
3672 [45198]: https://github.com/rust-lang/rust/pull/45198
3673 [45506]: https://github.com/rust-lang/rust/pull/45506
3674 [45904]: https://github.com/rust-lang/rust/pull/45904
3675 [45990]: https://github.com/rust-lang/rust/pull/45990
3676 [46012]: https://github.com/rust-lang/rust/pull/46012
3677 [46077]: https://github.com/rust-lang/rust/pull/46077
3678 [46094]: https://github.com/rust-lang/rust/pull/46094
3679 [46284]: https://github.com/rust-lang/rust/pull/46284
3680 [46287]: https://github.com/rust-lang/rust/pull/46287
3681 [46293]: https://github.com/rust-lang/rust/pull/46293
3682 [46528]: https://github.com/rust-lang/rust/pull/46528
3683 [46671]: https://github.com/rust-lang/rust/pull/46671
3684 [46713]: https://github.com/rust-lang/rust/pull/46713
3685 [46735]: https://github.com/rust-lang/rust/pull/46735
3686 [46749]: https://github.com/rust-lang/rust/pull/46749
3687 [46760]: https://github.com/rust-lang/rust/pull/46760
3688 [46798]: https://github.com/rust-lang/rust/pull/46798
3689 [46828]: https://github.com/rust-lang/rust/pull/46828
3690 [46831]: https://github.com/rust-lang/rust/pull/46831
3691 [46833]: https://github.com/rust-lang/rust/pull/46833
3692 [46910]: https://github.com/rust-lang/rust/pull/46910
3693 [46977]: https://github.com/rust-lang/rust/pull/46977
3694 [47018]: https://github.com/rust-lang/rust/pull/47018
3695 [47080]: https://github.com/rust-lang/rust/pull/47080
3696 [47084]: https://github.com/rust-lang/rust/pull/47084
3697 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3698 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3699 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3700 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3701 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3702 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3705 Version 1.23.0 (2018-01-04)
3706 ==========================
3710 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3711 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3712 Which should fix some confusing errors in some operations.
3716 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3717 undefined behavior.][45920]
3718 - [rustc now suggests renaming import if names clash.][45660]
3719 - [Display errors/warnings correctly when there are zero-width or
3720 wide characters.][45711]
3721 - [rustc now avoids unnecessary copies of arguments that are
3722 simple bindings][45380] This should improve memory usage on average by 5-10%.
3723 - [Updated musl used to build musl rustc to 1.1.17][45393]
3727 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3728 - [Implement Hash for raw pointers to unsized types][45483]
3729 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3730 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3731 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3732 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3733 and `<*mut T>::as_mut`][44932]
3734 - [Optimized `Thread::{park, unpark}` implementation][45524]
3735 - [Improved `SliceExt::binary_search` performance.][45333]
3736 - [impl `FromIterator<()>` for `()`][45379]
3737 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3745 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3746 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3747 - [Added unit test checking to `cargo check`][cargo/4592]
3748 - [Cargo now lets you install a specific version
3749 using `cargo install --version`][cargo/4637]
3753 - [Releases now ship with the Cargo book documentation.][45692]
3754 - [rustdoc now prints rendering warnings on every run.][45324]
3758 - [Changes have been made to type equality to make it more correct,
3759 in rare cases this could break some code.][45853] [Tracking issue for
3760 further information][45852]
3761 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3762 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3763 Android 9, the minimum supported version is Android 14.
3764 - [Bumped the minimum LLVM to 3.9][45326]
3766 [44042]: https://github.com/rust-lang/rust/pull/44042
3767 [44932]: https://github.com/rust-lang/rust/pull/44932
3768 [45267]: https://github.com/rust-lang/rust/pull/45267
3769 [45324]: https://github.com/rust-lang/rust/pull/45324
3770 [45326]: https://github.com/rust-lang/rust/pull/45326
3771 [45333]: https://github.com/rust-lang/rust/pull/45333
3772 [45379]: https://github.com/rust-lang/rust/pull/45379
3773 [45380]: https://github.com/rust-lang/rust/pull/45380
3774 [45393]: https://github.com/rust-lang/rust/pull/45393
3775 [45435]: https://github.com/rust-lang/rust/pull/45435
3776 [45483]: https://github.com/rust-lang/rust/pull/45483
3777 [45524]: https://github.com/rust-lang/rust/pull/45524
3778 [45571]: https://github.com/rust-lang/rust/pull/45571
3779 [45580]: https://github.com/rust-lang/rust/pull/45580
3780 [45610]: https://github.com/rust-lang/rust/pull/45610
3781 [45660]: https://github.com/rust-lang/rust/pull/45660
3782 [45692]: https://github.com/rust-lang/rust/pull/45692
3783 [45711]: https://github.com/rust-lang/rust/pull/45711
3784 [45772]: https://github.com/rust-lang/rust/pull/45772
3785 [45852]: https://github.com/rust-lang/rust/issues/45852
3786 [45853]: https://github.com/rust-lang/rust/pull/45853
3787 [45887]: https://github.com/rust-lang/rust/pull/45887
3788 [45920]: https://github.com/rust-lang/rust/pull/45920
3789 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3790 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3791 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3794 Version 1.22.1 (2017-11-22)
3795 ==========================
3797 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3799 [46183]: https://github.com/rust-lang/rust/pull/46183
3801 Version 1.22.0 (2017-11-22)
3802 ==========================
3806 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3807 - [Now accepts underscores in unicode escapes][43716]
3808 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3809 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3813 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3814 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3815 This should decrease compile times for debug builds.
3816 - [strict memory alignment now enabled on ARMv6][45094]
3817 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3821 - [Allow atomic operations up to 32 bits
3822 on `armv5te_unknown_linux_gnueabi`][44978]
3823 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3824 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3825 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3826 - [Properly detect overflow in `Instant += Duration`.][44220]
3827 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3828 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3829 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3836 - [Cargo will now build multi file examples in subdirectories of the `examples`
3837 folder that have a `main.rs` file.][cargo/4496]
3838 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3839 the old format will continue to work and can be updated with `cargo update`.
3840 - [Now supports vendoring git repositories][cargo/3992]
3844 - [`libbacktrace` is now available on Apple platforms.][44251]
3845 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3846 This now lets you specify that a given code example will fail to compile.
3850 - [The minimum Android version that rustc can build for has been bumped
3851 to `4.0` from `2.3`][45656]
3852 - [Allowing `T op= &T` for numeric types has broken some type
3853 inference cases][45480]
3856 [42526]: https://github.com/rust-lang/rust/pull/42526
3857 [43017]: https://github.com/rust-lang/rust/pull/43017
3858 [43716]: https://github.com/rust-lang/rust/pull/43716
3859 [43949]: https://github.com/rust-lang/rust/pull/43949
3860 [44015]: https://github.com/rust-lang/rust/pull/44015
3861 [44220]: https://github.com/rust-lang/rust/pull/44220
3862 [44251]: https://github.com/rust-lang/rust/pull/44251
3863 [44287]: https://github.com/rust-lang/rust/pull/44287
3864 [44303]: https://github.com/rust-lang/rust/pull/44303
3865 [44456]: https://github.com/rust-lang/rust/pull/44456
3866 [44466]: https://github.com/rust-lang/rust/pull/44466
3867 [44895]: https://github.com/rust-lang/rust/pull/44895
3868 [44966]: https://github.com/rust-lang/rust/pull/44966
3869 [44978]: https://github.com/rust-lang/rust/pull/44978
3870 [45041]: https://github.com/rust-lang/rust/pull/45041
3871 [45064]: https://github.com/rust-lang/rust/pull/45064
3872 [45075]: https://github.com/rust-lang/rust/pull/45075
3873 [45094]: https://github.com/rust-lang/rust/pull/45094
3874 [45095]: https://github.com/rust-lang/rust/pull/45095
3875 [45480]: https://github.com/rust-lang/rust/issues/45480
3876 [45656]: https://github.com/rust-lang/rust/pull/45656
3877 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3878 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3879 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3886 Version 1.21.0 (2017-10-12)
3887 ==========================
3891 - [You can now use static references for literals.][43838]
3895 let x: &'static u32 = &0;
3898 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3901 my_macro!(Vec<i32>::new); // Always worked
3902 my_macro!(Vec::<i32>::new); // Now works
3907 - [Upgraded jemalloc to 4.5.0][43911]
3908 - [Enabled unwinding panics on Redox][43917]
3909 - [Now runs LLVM in parallel during translation phase.][43506]
3910 This should reduce peak memory usage.
3914 - [Generate builtin impls for `Clone` for all arrays and tuples that
3915 are `T: Clone`][43690]
3916 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3917 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3918 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3923 [`std::mem::discriminant`]
3927 - [You can now call `cargo install` with multiple package names][cargo/4216]
3928 - [Cargo commands inside a virtual workspace will now implicitly
3929 pass `--all`][cargo/4335]
3930 - [Added a `[patch]` section to `Cargo.toml` to handle
3931 prepublication dependencies][cargo/4123] [RFC 1969]
3932 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3933 like patterns][cargo/4270]
3934 - [Added the `--all-targets` option][cargo/4400]
3935 - [Using required dependencies as a feature is now deprecated and emits
3936 a warning][cargo/4364]
3941 - [Cargo docs are moving][43916]
3942 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3943 - [The rustdoc book is now available][43863]
3944 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3945 - [Added a preview of RLS has been made available through rustup][44204]
3946 Install with `rustup component add rls-preview`
3947 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3948 Previously only showed `std::os::unix`.
3952 - [Changes in method matching against higher-ranked types][43880] This may cause
3953 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3954 - [rustc's JSON error output's byte position start at top of file.][42973]
3955 Was previously relative to the rustc's internal `CodeMap` struct which
3956 required the unstable library `libsyntax` to correctly use.
3957 - [`unused_results` lint no longer ignores booleans][43728]
3959 [42565]: https://github.com/rust-lang/rust/pull/42565
3960 [42973]: https://github.com/rust-lang/rust/pull/42973
3961 [43348]: https://github.com/rust-lang/rust/pull/43348
3962 [43459]: https://github.com/rust-lang/rust/pull/43459
3963 [43506]: https://github.com/rust-lang/rust/pull/43506
3964 [43540]: https://github.com/rust-lang/rust/pull/43540
3965 [43690]: https://github.com/rust-lang/rust/pull/43690
3966 [43728]: https://github.com/rust-lang/rust/pull/43728
3967 [43838]: https://github.com/rust-lang/rust/pull/43838
3968 [43863]: https://github.com/rust-lang/rust/pull/43863
3969 [43880]: https://github.com/rust-lang/rust/pull/43880
3970 [43911]: https://github.com/rust-lang/rust/pull/43911
3971 [43916]: https://github.com/rust-lang/rust/pull/43916
3972 [43917]: https://github.com/rust-lang/rust/pull/43917
3973 [44204]: https://github.com/rust-lang/rust/pull/44204
3974 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3975 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3976 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3977 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3978 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3979 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3980 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3981 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3982 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3984 Version 1.20.0 (2017-08-31)
3985 ===========================
3989 - [Associated constants are now stabilised.][42809]
3990 - [A lot of macro bugs are now fixed.][42913]
3995 - [Struct fields are now properly coerced to the expected field type.][42807]
3996 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3997 `wasm32-experimental-emscripten` target.
3998 - [Changed some of the error messages to be more helpful.][42033]
3999 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4001 - [rustc now reports the total number of errors on compilation failure][43015]
4002 previously this was only the number of errors in the pass that failed.
4003 - [Expansion in rustc has been sped up 29x.][42533]
4004 - [added `msp430-none-elf` target.][43099]
4005 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4007 - [Fixes backtraces on Redox][43228]
4008 - [rustc now identifies different versions of same crate when absolute paths of
4009 different types match in an error message.][42826]
4015 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4016 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4018 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4019 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4020 - [Impl `Clone` for `DefaultHasher`.][42799]
4021 - [Impl `Sync` for `SyncSender`.][42397]
4022 - [Impl `FromStr` for `char`][42271]
4023 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4025 - [allow messages in the `unimplemented!()` macro.][42155]
4026 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4027 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4028 - [Upgrade to Unicode 10.0.0][42999]
4029 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4030 - [Skip the main thread's manual stack guard on Linux][43072]
4031 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4032 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4034 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4039 - [`CStr::into_c_string`]
4040 - [`CString::as_c_str`]
4041 - [`CString::into_boxed_c_str`]
4042 - [`Chain::get_mut`]
4043 - [`Chain::get_ref`]
4044 - [`Chain::into_inner`]
4045 - [`Option::get_or_insert_with`]
4046 - [`Option::get_or_insert`]
4047 - [`OsStr::into_os_string`]
4048 - [`OsString::into_boxed_os_str`]
4051 - [`Utf8Error::error_len`]
4052 - [`char::EscapeDebug`]
4053 - [`char::escape_debug`]
4054 - [`compile_error!`]
4055 - [`f32::from_bits`]
4057 - [`f64::from_bits`]
4059 - [`mem::ManuallyDrop`]
4060 - [`slice::sort_unstable_by_key`]
4061 - [`slice::sort_unstable_by`]
4062 - [`slice::sort_unstable`]
4063 - [`str::from_boxed_utf8_unchecked`]
4064 - [`str::as_bytes_mut`]
4065 - [`str::as_bytes_mut`]
4066 - [`str::from_utf8_mut`]
4067 - [`str::from_utf8_unchecked_mut`]
4069 - [`str::get_unchecked_mut`]
4070 - [`str::get_unchecked`]
4072 - [`str::into_boxed_bytes`]
4077 - [Cargo API token location moved from `~/.cargo/config` to
4078 `~/.cargo/credentials`.][cargo/3978]
4079 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4080 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4081 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4082 - [You can now specify version of a binary when installed through
4083 `cargo install` using `--vers`.][cargo/4229]
4084 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4085 failure.][cargo/4248]
4086 - [Changed the convention around which file is the crate root.][cargo/4259]
4087 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4088 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4093 - [Functions with `'static` in their return types will now not be as usable as
4094 if they were using lifetime parameters instead.][42417]
4095 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4096 takes the sign of NaN into account where previously didn't.][42430]
4098 [42033]: https://github.com/rust-lang/rust/pull/42033
4099 [42155]: https://github.com/rust-lang/rust/pull/42155
4100 [42271]: https://github.com/rust-lang/rust/pull/42271
4101 [42397]: https://github.com/rust-lang/rust/pull/42397
4102 [42417]: https://github.com/rust-lang/rust/pull/42417
4103 [42430]: https://github.com/rust-lang/rust/pull/42430
4104 [42431]: https://github.com/rust-lang/rust/pull/42431
4105 [42533]: https://github.com/rust-lang/rust/pull/42533
4106 [42571]: https://github.com/rust-lang/rust/pull/42571
4107 [42613]: https://github.com/rust-lang/rust/pull/42613
4108 [42799]: https://github.com/rust-lang/rust/pull/42799
4109 [42807]: https://github.com/rust-lang/rust/pull/42807
4110 [42809]: https://github.com/rust-lang/rust/pull/42809
4111 [42822]: https://github.com/rust-lang/rust/pull/42822
4112 [42826]: https://github.com/rust-lang/rust/pull/42826
4113 [42854]: https://github.com/rust-lang/rust/pull/42854
4114 [42913]: https://github.com/rust-lang/rust/pull/42913
4115 [42999]: https://github.com/rust-lang/rust/pull/42999
4116 [43011]: https://github.com/rust-lang/rust/pull/43011
4117 [43015]: https://github.com/rust-lang/rust/pull/43015
4118 [43072]: https://github.com/rust-lang/rust/pull/43072
4119 [43077]: https://github.com/rust-lang/rust/pull/43077
4120 [43097]: https://github.com/rust-lang/rust/pull/43097
4121 [43099]: https://github.com/rust-lang/rust/pull/43099
4122 [43170]: https://github.com/rust-lang/rust/pull/43170
4123 [43178]: https://github.com/rust-lang/rust/pull/43178
4124 [43185]: https://github.com/rust-lang/rust/pull/43185
4125 [43228]: https://github.com/rust-lang/rust/pull/43228
4126 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4127 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4128 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4129 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4130 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4131 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4132 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4133 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4134 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4135 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4136 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4137 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4138 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4139 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4140 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4141 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4142 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4143 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4144 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4145 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4146 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4147 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4148 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4149 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4150 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4151 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4152 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4153 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4154 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4155 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4156 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4157 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4158 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4159 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4160 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4161 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4162 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4163 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4164 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4167 Version 1.19.0 (2017-07-20)
4168 ===========================
4173 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4174 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4175 - [Macro recursion limit increased to 1024 from 64.][41676]
4176 - [Added lint for detecting unused macros.][41907]
4177 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4178 For example: `let x = loop { break 7; };`
4179 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4180 contain `Copy` types and cannot have a `Drop` implementation.
4181 Example: `union Foo { bar: u8, baz: usize }`
4182 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4183 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4188 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4189 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4190 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4191 you should use `--target armv7-linux-androideabi`.
4192 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4193 - [Minor optimisation of string operations.][42037]
4194 - [Compiler error message is now `aborting due to previous error(s)` instead of
4195 `aborting due to N previous errors`][42150] This was previously inaccurate and
4196 would only count certain kinds of errors.
4197 - [The compiler now supports Visual Studio 2017][42225]
4198 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4199 - [Added a lot][42264] of [new error codes][42302]
4200 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4201 libraries with C Run-time Libraries(CRT) to be statically linked.
4202 - [Fixed various ARM codegen bugs][42740]
4207 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4208 `Extend<Cow<'a, str>>`][41449]
4209 - [`Vec` now implements `From<&mut [T]>`][41530]
4210 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4211 - [`SplitWhitespace` now implements `Clone`][41659]
4212 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4214 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4215 macros, but for printing to stderr.
4220 - [`OsString::shrink_to_fit`]
4223 - [`thread::ThreadId`]
4228 - [Build scripts can now add environment variables to the environment
4229 the crate is being compiled in.
4230 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4231 - [Subcommands now replace the current process rather than spawning a new
4232 child process][cargo/3970]
4233 - [Workspace members can now accept glob file patterns][cargo/3979]
4234 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4235 the members in a given workspace.][cargo/3988]
4236 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4237 - [Target directory path is now in the cargo metadata][cargo/4022]
4238 - [Cargo no longer checks out a local working directory for the
4239 crates.io index][cargo/4026] This should provide smaller file size for the
4240 registry, and improve cloning times, especially on Windows machines.
4241 - [Added an `--exclude` option for excluding certain packages when using the
4242 `--all` option][cargo/4031]
4243 - [Cargo will now automatically retry when receiving a 5xx error
4244 from crates.io][cargo/4032]
4245 - [The `--features` option now accepts multiple comma or space
4246 delimited values.][cargo/4084]
4247 - [Added support for custom target specific runners][cargo/3954]
4252 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4254 - [Rust will now release XZ compressed packages][rust-installer/57]
4255 - [rustup will now prefer to download rust packages with
4256 XZ compression][rustup/1100] over GZip packages.
4257 - [Added the ability to escape `#` in rust documentation][41785] By adding
4258 additional `#`'s ie. `##` is now `#`
4263 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4264 - [`-Z` flags are now no longer allowed to be used on the stable
4265 compiler.][41751] This has been a warning for a year previous to this.
4266 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4267 longer works][42844]. Users should migrate to the built-in `check`
4268 command, which has been available since 1.16.
4269 - [Ending a float literal with `._` is now a hard error.
4270 Example: `42._` .][41946]
4271 - [Any use of a private `extern crate` outside of its module is now a
4272 hard error.][36886] This was previously a warning.
4273 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4274 relative while the `::` prefix makes a path absolute, but was ignored and the
4275 path was relative regardless.
4276 - [Floating point constants in match patterns is now a hard error][36890]
4277 This was previously a warning.
4278 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4279 match patterns is now a hard error][36891] This was previously a warning.
4280 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4282 - [From the pound escape, lines consisting of multiple `#`s are
4284 - [It is an error to re-export private enum variants][42460]. This is
4285 known to break a number of crates that depend on an older version of
4287 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4288 to use it to find the linker, and the build will fail where it did
4289 not previously][42607]
4291 [36886]: https://github.com/rust-lang/rust/issues/36886
4292 [36888]: https://github.com/rust-lang/rust/issues/36888
4293 [36890]: https://github.com/rust-lang/rust/issues/36890
4294 [36891]: https://github.com/rust-lang/rust/issues/36891
4295 [36892]: https://github.com/rust-lang/rust/issues/36892
4296 [37406]: https://github.com/rust-lang/rust/issues/37406
4297 [39983]: https://github.com/rust-lang/rust/pull/39983
4298 [41145]: https://github.com/rust-lang/rust/pull/41145
4299 [41192]: https://github.com/rust-lang/rust/pull/41192
4300 [41258]: https://github.com/rust-lang/rust/pull/41258
4301 [41370]: https://github.com/rust-lang/rust/pull/41370
4302 [41449]: https://github.com/rust-lang/rust/pull/41449
4303 [41530]: https://github.com/rust-lang/rust/pull/41530
4304 [41624]: https://github.com/rust-lang/rust/pull/41624
4305 [41656]: https://github.com/rust-lang/rust/pull/41656
4306 [41659]: https://github.com/rust-lang/rust/pull/41659
4307 [41676]: https://github.com/rust-lang/rust/pull/41676
4308 [41751]: https://github.com/rust-lang/rust/pull/41751
4309 [41764]: https://github.com/rust-lang/rust/pull/41764
4310 [41785]: https://github.com/rust-lang/rust/pull/41785
4311 [41873]: https://github.com/rust-lang/rust/pull/41873
4312 [41907]: https://github.com/rust-lang/rust/pull/41907
4313 [41946]: https://github.com/rust-lang/rust/pull/41946
4314 [42016]: https://github.com/rust-lang/rust/pull/42016
4315 [42037]: https://github.com/rust-lang/rust/pull/42037
4316 [42068]: https://github.com/rust-lang/rust/pull/42068
4317 [42150]: https://github.com/rust-lang/rust/pull/42150
4318 [42162]: https://github.com/rust-lang/rust/pull/42162
4319 [42225]: https://github.com/rust-lang/rust/pull/42225
4320 [42264]: https://github.com/rust-lang/rust/pull/42264
4321 [42302]: https://github.com/rust-lang/rust/pull/42302
4322 [42460]: https://github.com/rust-lang/rust/issues/42460
4323 [42607]: https://github.com/rust-lang/rust/issues/42607
4324 [42740]: https://github.com/rust-lang/rust/pull/42740
4325 [42844]: https://github.com/rust-lang/rust/issues/42844
4326 [42948]: https://github.com/rust-lang/rust/pull/42948
4327 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4328 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4329 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4330 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4331 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4332 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4333 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4334 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4335 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4336 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4337 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4338 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4339 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4340 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4341 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4342 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4343 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4344 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4345 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4346 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4347 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4348 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4351 Version 1.18.0 (2017-06-08)
4352 ===========================
4357 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4358 make the item visible to just that module tree. Also accepts the keyword
4359 `crate` to make something public to the whole crate but not users of the
4360 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4361 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4362 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4363 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4364 types like `Write + Send`, trailing `+` are now supported in trait objects,
4365 and better error reporting for trait objects starting with `?Sized`.
4366 - [0e+10 is now a valid floating point literal][40589]
4367 - [Now warns if you bind a lifetime parameter to 'static][40734]
4368 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4369 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4370 representation in some cases.][40377]
4375 - [rustc can now emit mir with `--emit mir`][39891]
4376 - [Improved LLVM IR for trivial functions][40367]
4377 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4378 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4379 opportunities found through profiling
4380 - [Improved backtrace formatting when panicking][38165]
4385 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4386 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4387 iteration or reallocation.
4388 - [Simplified HashMap Bucket interface][40561] provides performance
4389 improvements for iterating and cloning.
4390 - [Specialize Vec::from_elem to use calloc][40409]
4391 - [Fixed Race condition in fs::create_dir_all][39799]
4392 - [No longer caching stdio on Windows][40516]
4393 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4394 2.50%~ faster and in one case now 12.50% faster.
4395 - [Optimized `AtomicBool::fetch_nand`][41143]
4400 - [`Child::try_wait`]
4401 - [`HashMap::retain`]
4402 - [`HashSet::retain`]
4404 - [`TcpStream::peek`]
4405 - [`UdpSocket::peek`]
4406 - [`UdpSocket::peek_from`]
4411 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4412 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4413 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4414 - [Added Android build support][cargo/3885]
4415 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4416 of a certain type, for example `cargo build --bins` will build all
4418 - [Added support for haiku][cargo/3952]
4423 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4424 - [Added rust-windbg script for better debugging on Windows][39983]
4425 - [Rust now uses the official cross compiler for NetBSD][40612]
4426 - [rustdoc now accepts `#` at the start of files][40828]
4427 - [Fixed jemalloc support for musl][41168]
4432 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4433 always placed after the sign if it exists and before the digits. With the `#`
4434 flag the zeroes are placed after the prefix and before the digits.
4435 - [Due to the struct field optimisation][40377], using `transmute` on structs
4436 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4437 always been undefined behavior, but is now more likely to break in practice.
4438 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4439 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4440 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4441 - [Overlapping inherent `impl`s are now a hard error][40728]
4442 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4443 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4444 `out.asm` and `out.ll` instead of only one of the filetypes.
4445 - [ calling a function that returns `Self` will no longer work][41805] when
4446 the size of `Self` cannot be statically determined.
4447 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4448 this has caused a few regressions namely:
4450 - Changed the link order of local static/dynamic libraries (respecting the
4451 order on given rather than having the compiler reorder).
4452 - Changed how MinGW is linked, native code linked to dynamic libraries
4453 may require manually linking to the gcc support library (for the native
4456 [38165]: https://github.com/rust-lang/rust/pull/38165
4457 [39799]: https://github.com/rust-lang/rust/pull/39799
4458 [39891]: https://github.com/rust-lang/rust/pull/39891
4459 [39983]: https://github.com/rust-lang/rust/pull/39983
4460 [40043]: https://github.com/rust-lang/rust/pull/40043
4461 [40241]: https://github.com/rust-lang/rust/pull/40241
4462 [40338]: https://github.com/rust-lang/rust/pull/40338
4463 [40367]: https://github.com/rust-lang/rust/pull/40367
4464 [40377]: https://github.com/rust-lang/rust/pull/40377
4465 [40409]: https://github.com/rust-lang/rust/pull/40409
4466 [40516]: https://github.com/rust-lang/rust/pull/40516
4467 [40556]: https://github.com/rust-lang/rust/pull/40556
4468 [40561]: https://github.com/rust-lang/rust/pull/40561
4469 [40589]: https://github.com/rust-lang/rust/pull/40589
4470 [40612]: https://github.com/rust-lang/rust/pull/40612
4471 [40723]: https://github.com/rust-lang/rust/pull/40723
4472 [40728]: https://github.com/rust-lang/rust/pull/40728
4473 [40731]: https://github.com/rust-lang/rust/pull/40731
4474 [40734]: https://github.com/rust-lang/rust/pull/40734
4475 [40805]: https://github.com/rust-lang/rust/pull/40805
4476 [40807]: https://github.com/rust-lang/rust/pull/40807
4477 [40828]: https://github.com/rust-lang/rust/pull/40828
4478 [40870]: https://github.com/rust-lang/rust/pull/40870
4479 [41085]: https://github.com/rust-lang/rust/pull/41085
4480 [41143]: https://github.com/rust-lang/rust/pull/41143
4481 [41168]: https://github.com/rust-lang/rust/pull/41168
4482 [41270]: https://github.com/rust-lang/rust/issues/41270
4483 [41469]: https://github.com/rust-lang/rust/pull/41469
4484 [41805]: https://github.com/rust-lang/rust/issues/41805
4485 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4486 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4487 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4488 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4489 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4490 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4491 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4492 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4493 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4494 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4495 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4496 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4497 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4498 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4501 Version 1.17.0 (2017-04-27)
4502 ===========================
4507 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4508 * [Fields of structs may be initialized without duplicating the field/variable
4509 names][39761]. [RFC 1682]
4510 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4511 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4512 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4513 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4514 `'b`. Soundness fix.
4515 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4516 * [Static variables may contain references to other statics][40027]
4521 * [Exit quickly on only `--emit dep-info`][40336]
4522 * [Make `-C relocation-model` more correctly determine whether the linker
4523 creates a position-independent executable][40245]
4524 * [Add `-C overflow-checks` to directly control whether integer overflow
4526 * [The rustc type checker now checks items on demand instead of in a single
4527 in-order pass][40008]. This is mostly an internal refactoring in support of
4528 future work, including incremental type checking, but also resolves [RFC
4529 1647], allowing `Self` to appear in `impl` `where` clauses.
4530 * [Optimize vtable loads][39995]
4531 * [Turn off vectorization for Emscripten targets][39990]
4532 * [Provide suggestions for unknown macros imported with `use`][39953]
4533 * [Fix ICEs in path resolution][39939]
4534 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4535 * [Add clearer error message using `&str + &str`][39116]
4546 * [`Ordering::then`]
4547 * [`Ordering::then_with`]
4548 * [`BTreeMap::range`]
4549 * [`BTreeMap::range_mut`]
4550 * [`collections::Bound`]
4551 * [`process::abort`]
4552 * [`ptr::read_unaligned`]
4553 * [`ptr::write_unaligned`]
4554 * [`Result::expect_err`]
4557 * [`Cell::into_inner`]
4563 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4564 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4565 * [`String` implements `FromIterator<&char>`][40028]
4566 * `Box` [implements][40009] a number of new conversions:
4567 `From<Box<str>> for String`,
4568 `From<Box<[T]>> for Vec<T>`,
4569 `From<Box<CStr>> for CString`,
4570 `From<Box<OsStr>> for OsString`,
4571 `From<Box<Path>> for PathBuf`,
4572 `Into<Box<str>> for String`,
4573 `Into<Box<[T]>> for Vec<T>`,
4574 `Into<Box<CStr>> for CString`,
4575 `Into<Box<OsStr>> for OsString`,
4576 `Into<Box<Path>> for PathBuf`,
4577 `Default for Box<str>`,
4578 `Default for Box<CStr>`,
4579 `Default for Box<OsStr>`,
4580 `From<&CStr> for Box<CStr>`,
4581 `From<&OsStr> for Box<OsStr>`,
4582 `From<&Path> for Box<Path>`
4583 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4584 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4585 * [Slightly optimize `slice::sort`][39538]
4586 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4587 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4588 `Box<str>` implements `From<&str>`][39438]
4589 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4590 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4591 * [`format!` estimates the needed capacity before writing a string][39356]
4592 * [Support unprivileged symlink creation in Windows][38921]
4593 * [`PathBuf` implements `Default`][38764]
4594 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4595 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4596 and poor hash functions.
4601 * [Add `cargo check --all`][cargo/3731]
4602 * [Add an option to ignore SSL revocation checking][cargo/3699]
4603 * [Add `cargo run --package`][cargo/3691]
4604 * [Add `required_features`][cargo/3667]
4605 * [Assume `build.rs` is a build script][cargo/3664]
4606 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4611 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4613 * [The "Unstable Book" documents nightly-only features][ubook]
4614 * [Improve the style of the sidebar in rustdoc output][40265]
4615 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4616 * [Fix MSP430 breakage due to `i128`][40257]
4617 * [Preliminary Solaris/SPARCv9 support][39903]
4618 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4619 run without installing the MSVC runtime.
4620 * [`rustdoc --test` includes file names in test names][39788]
4621 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4622 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4623 * [Initial support for `aarch64-unknown-freebsd`][39491]
4624 * [Initial support for `i686-unknown-netbsd`][39426]
4625 * [This release no longer includes the old makefile build system][39431]. Rust
4626 is built with a custom build system, written in Rust, and with Cargo.
4627 * [Add Debug implementations for libcollection structs][39002]
4628 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4629 * [`--test-threads=0` produces an error][38945]
4630 * [`rustup` installs documentation by default][40526]
4631 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4632 WinDbg and Visual Studio to improve the debugging experience.
4637 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4638 workaround, either use MSVC 2015 or run vcvars.bat.
4639 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4640 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4641 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4643 * [`format!` and `Display::to_string` panic if an underlying formatting
4644 implementation returns an error][40117]. Previously the error was silently
4645 ignored. It is incorrect for `write_fmt` to return an error when writing
4647 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4648 crates were marked stable and could be accessed from the stable toolchain.
4649 * [Rust git source no longer includes vendored crates][39728]. Those that need
4650 to build with vendored crates should build from release tarballs.
4651 * [Fix inert attributes from `proc_macro_derives`][39572]
4652 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4653 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4655 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4656 existing code generally ignores the type of dead-code unless a type-hint is
4657 provided; this can cause surprising inference interactions particularly around
4658 defaulting. The new code uniformly ignores the result type of dead-code.
4659 * [Tuple-struct constructors with private fields are no longer visible][38932]
4660 * [Lifetime parameters that do not appear in the arguments are now considered
4661 early-bound][38897], resolving a soundness bug (#[32330]). The
4662 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4664 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4665 * [Make transmuting from fn item types to pointer-sized types a hard
4668 [27787]: https://github.com/rust-lang/rust/issues/27787
4669 [32330]: https://github.com/rust-lang/rust/issues/32330
4670 [34198]: https://github.com/rust-lang/rust/pull/34198
4671 [38161]: https://github.com/rust-lang/rust/pull/38161
4672 [38368]: https://github.com/rust-lang/rust/pull/38368
4673 [38584]: https://github.com/rust-lang/rust/issues/38584
4674 [38661]: https://github.com/rust-lang/rust/pull/38661
4675 [38764]: https://github.com/rust-lang/rust/pull/38764
4676 [38864]: https://github.com/rust-lang/rust/issues/38864
4677 [38897]: https://github.com/rust-lang/rust/pull/38897
4678 [38921]: https://github.com/rust-lang/rust/pull/38921
4679 [38932]: https://github.com/rust-lang/rust/pull/38932
4680 [38945]: https://github.com/rust-lang/rust/pull/38945
4681 [38981]: https://github.com/rust-lang/rust/pull/38981
4682 [39002]: https://github.com/rust-lang/rust/pull/39002
4683 [39116]: https://github.com/rust-lang/rust/pull/39116
4684 [39193]: https://github.com/rust-lang/rust/pull/39193
4685 [39265]: https://github.com/rust-lang/rust/pull/39265
4686 [39356]: https://github.com/rust-lang/rust/pull/39356
4687 [39372]: https://github.com/rust-lang/rust/pull/39372
4688 [39426]: https://github.com/rust-lang/rust/pull/39426
4689 [39431]: https://github.com/rust-lang/rust/pull/39431
4690 [39438]: https://github.com/rust-lang/rust/pull/39438
4691 [39440]: https://github.com/rust-lang/rust/pull/39440
4692 [39485]: https://github.com/rust-lang/rust/pull/39485
4693 [39491]: https://github.com/rust-lang/rust/pull/39491
4694 [39518]: https://github.com/rust-lang/rust/pull/39518
4695 [39538]: https://github.com/rust-lang/rust/pull/39538
4696 [39572]: https://github.com/rust-lang/rust/pull/39572
4697 [39633]: https://github.com/rust-lang/rust/pull/39633
4698 [39642]: https://github.com/rust-lang/rust/pull/39642
4699 [39728]: https://github.com/rust-lang/rust/pull/39728
4700 [39761]: https://github.com/rust-lang/rust/pull/39761
4701 [39788]: https://github.com/rust-lang/rust/pull/39788
4702 [39793]: https://github.com/rust-lang/rust/pull/39793
4703 [39837]: https://github.com/rust-lang/rust/pull/39837
4704 [39843]: https://github.com/rust-lang/rust/pull/39843
4705 [39851]: https://github.com/rust-lang/rust/pull/39851
4706 [39903]: https://github.com/rust-lang/rust/pull/39903
4707 [39939]: https://github.com/rust-lang/rust/pull/39939
4708 [39953]: https://github.com/rust-lang/rust/pull/39953
4709 [39960]: https://github.com/rust-lang/rust/pull/39960
4710 [39990]: https://github.com/rust-lang/rust/pull/39990
4711 [39995]: https://github.com/rust-lang/rust/pull/39995
4712 [40008]: https://github.com/rust-lang/rust/pull/40008
4713 [40009]: https://github.com/rust-lang/rust/pull/40009
4714 [40027]: https://github.com/rust-lang/rust/pull/40027
4715 [40028]: https://github.com/rust-lang/rust/pull/40028
4716 [40037]: https://github.com/rust-lang/rust/pull/40037
4717 [40117]: https://github.com/rust-lang/rust/pull/40117
4718 [40166]: https://github.com/rust-lang/rust/pull/40166
4719 [40245]: https://github.com/rust-lang/rust/pull/40245
4720 [40257]: https://github.com/rust-lang/rust/pull/40257
4721 [40261]: https://github.com/rust-lang/rust/pull/40261
4722 [40265]: https://github.com/rust-lang/rust/pull/40265
4723 [40319]: https://github.com/rust-lang/rust/pull/40319
4724 [40336]: https://github.com/rust-lang/rust/pull/40336
4725 [40526]: https://github.com/rust-lang/rust/pull/40526
4726 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4727 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4728 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4729 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4730 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4731 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4732 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4733 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4734 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4735 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4736 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4737 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4738 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4739 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4740 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4741 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4742 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4743 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4744 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4745 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4746 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4747 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4748 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4749 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4750 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4751 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4752 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4753 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4754 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4755 [mdbook]: https://crates.io/crates/mdbook
4756 [ubook]: https://doc.rust-lang.org/unstable-book/
4759 Version 1.16.0 (2017-03-16)
4760 ===========================
4765 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4766 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4767 match patterns][38069]
4768 * [Clean up semantics of `self` in an import list][38313]
4769 * [`Self` may appear in `impl` headers][38920]
4770 * [`Self` may appear in struct expressions][39282]
4775 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4776 a `.rmeta` file containing only crate metadata][38571]. This can be
4777 used by tools like the Rust Language Service to perform
4778 metadata-only builds.
4779 * [Levenshtein based typo suggestions now work in most places, while
4780 previously they worked only for fields and sometimes for local
4781 variables][38927]. Together with the overhaul of "no
4782 resolution"/"unexpected resolution" errors (#[38154]) they result in
4783 large and systematic improvement in resolution diagnostics.
4784 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4786 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4787 * [`rustc` no longer attempts to provide "consider using an explicit
4788 lifetime" suggestions][37057]. They were inaccurate.
4793 * [`VecDeque::truncate`]
4794 * [`VecDeque::resize`]
4795 * [`String::insert_str`]
4796 * [`Duration::checked_add`]
4797 * [`Duration::checked_sub`]
4798 * [`Duration::checked_div`]
4799 * [`Duration::checked_mul`]
4802 * [`SocketAddr::is_ipv4`]
4803 * [`SocketAddr::is_ipv6`]
4804 * [`IpAddr::is_ipv4`]
4805 * [`IpAddr::is_ipv6`]
4807 * [`Vec::dedup_by_key`]
4808 * [`Result::unwrap_or_default`]
4809 * [`<*const T>::wrapping_offset`]
4810 * [`<*mut T>::wrapping_offset`]
4811 * `CommandExt::creation_flags`
4812 * [`File::set_permissions`]
4813 * [`String::split_off`]
4818 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4819 their argument by `Borrow` parameter][37761]
4820 * [All public types in std implement `Debug`][38006]
4821 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4822 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4823 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4825 * [std: Fix partial writes in `LineWriter`][38062]
4826 * [std: Clamp max read/write sizes on Unix][38062]
4827 * [Use more specific panic message for `&str` slicing errors][38066]
4828 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4829 functionality cannot be achieved in std currently.
4830 * [`writeln!`, like `println!`, now accepts a form with no string
4831 or formatting arguments, to just print a newline][38469]
4832 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4833 * [Reduce the size of static data in `std_unicode::tables`][38781]
4834 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4835 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4837 * [`Duration` implements `Sum`][38712]
4838 * [`String` implements `ToSocketAddrs`][39048]
4843 * [The `cargo check` command does a type check of a project without
4844 building it][cargo/3296]
4845 * [crates.io will display CI badges from Travis and AppVeyor, if
4846 specified in Cargo.toml][cargo/3546]
4847 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4848 * [Compilation profiles accept integer values for `debug`, in addition
4849 to `true` and `false`. These are passed to `rustc` as the value to
4850 `-C debuginfo`][cargo/3534]
4851 * [Implement `cargo --version --verbose`][cargo/3604]
4852 * [All builds now output 'dep-info' build dependencies compatible with
4853 make and ninja][cargo/3557]
4854 * [Build all workspace members with `build --all`][cargo/3511]
4855 * [Document all workspace members with `doc --all`][cargo/3515]
4856 * [Path deps outside workspace are not members][cargo/3443]
4861 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4862 the path to the Rust implementation][38589]
4863 * [The `armv7-linux-androideabi` target no longer enables NEON
4864 extensions, per Google's ABI guide][38413]
4865 * [The stock standard library can be compiled for Redox OS][38401]
4866 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4868 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4870 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4875 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4876 match patterns][38069]
4877 * In this release, references to uninhabited types can not be
4878 pattern-matched. This was accidentally allowed in 1.15.
4879 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4880 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4882 * [Clean up semantics of `self` in an import list][38313]
4883 * Reimplemented lifetime elision. This change was almost entirely compatible
4884 with existing code, but it did close a number of small bugs and loopholes,
4885 as well as being more accepting in some other [cases][41105].
4887 [37057]: https://github.com/rust-lang/rust/pull/37057
4888 [37761]: https://github.com/rust-lang/rust/pull/37761
4889 [38006]: https://github.com/rust-lang/rust/pull/38006
4890 [38051]: https://github.com/rust-lang/rust/pull/38051
4891 [38062]: https://github.com/rust-lang/rust/pull/38062
4892 [38062]: https://github.com/rust-lang/rust/pull/38622
4893 [38066]: https://github.com/rust-lang/rust/pull/38066
4894 [38069]: https://github.com/rust-lang/rust/pull/38069
4895 [38131]: https://github.com/rust-lang/rust/pull/38131
4896 [38154]: https://github.com/rust-lang/rust/pull/38154
4897 [38274]: https://github.com/rust-lang/rust/pull/38274
4898 [38304]: https://github.com/rust-lang/rust/pull/38304
4899 [38313]: https://github.com/rust-lang/rust/pull/38313
4900 [38314]: https://github.com/rust-lang/rust/pull/38314
4901 [38327]: https://github.com/rust-lang/rust/pull/38327
4902 [38401]: https://github.com/rust-lang/rust/pull/38401
4903 [38413]: https://github.com/rust-lang/rust/pull/38413
4904 [38469]: https://github.com/rust-lang/rust/pull/38469
4905 [38559]: https://github.com/rust-lang/rust/pull/38559
4906 [38571]: https://github.com/rust-lang/rust/pull/38571
4907 [38580]: https://github.com/rust-lang/rust/pull/38580
4908 [38589]: https://github.com/rust-lang/rust/pull/38589
4909 [38670]: https://github.com/rust-lang/rust/pull/38670
4910 [38712]: https://github.com/rust-lang/rust/pull/38712
4911 [38726]: https://github.com/rust-lang/rust/pull/38726
4912 [38781]: https://github.com/rust-lang/rust/pull/38781
4913 [38798]: https://github.com/rust-lang/rust/pull/38798
4914 [38909]: https://github.com/rust-lang/rust/pull/38909
4915 [38920]: https://github.com/rust-lang/rust/pull/38920
4916 [38927]: https://github.com/rust-lang/rust/pull/38927
4917 [39048]: https://github.com/rust-lang/rust/pull/39048
4918 [39282]: https://github.com/rust-lang/rust/pull/39282
4919 [39379]: https://github.com/rust-lang/rust/pull/39379
4920 [41105]: https://github.com/rust-lang/rust/issues/41105
4921 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4922 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4923 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4924 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4925 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4926 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4927 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4928 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4929 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4930 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4931 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4932 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4933 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4934 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4935 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4936 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4937 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4938 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4939 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4940 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4941 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4942 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4943 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4944 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4945 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4946 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4947 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4948 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4949 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4950 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4953 Version 1.15.1 (2017-02-09)
4954 ===========================
4956 * [Fix IntoIter::as_mut_slice's signature][39466]
4957 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4959 [39466]: https://github.com/rust-lang/rust/pull/39466
4960 [39523]: https://github.com/rust-lang/rust/pull/39523
4963 Version 1.15.0 (2017-02-02)
4964 ===========================
4969 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4970 stable. This allows popular code-generating crates like Serde and Diesel to
4971 work ergonomically. [RFC 1681].
4972 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4973 with curly braces][36868]. Part of [RFC 1506].
4974 * [A number of minor changes to name resolution have been activated][37127].
4975 They add up to more consistent semantics, allowing for future evolution of
4976 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4977 details of what is different. The breaking changes here have been transitioned
4978 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4979 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4981 * [`?Sized` can be used in `where` clauses][37791]
4982 * [There is now a limit on the size of monomorphized types and it can be
4983 modified with the `#![type_size_limit]` crate attribute, similarly to
4984 the `#![recursion_limit]` attribute][37789]
4989 * [On Windows, the compiler will apply dllimport attributes when linking to
4990 extern functions][37973]. Additional attributes and flags can control which
4991 library kind is linked and its name. [RFC 1717].
4992 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4993 * [The `--test` flag works with procedural macro crates][38107]
4994 * [Fix `extern "aapcs" fn` ABI][37814]
4995 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4996 * [The `format!` expander recognizes incorrect `printf` and shell-style
4997 formatting directives and suggests the correct format][37613].
4998 * [Only report one error for all unused imports in an import list][37456]
5000 Compiler Performance
5001 --------------------
5003 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5004 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5005 * [Don't clone in `UnificationTable::probe`][37848]
5006 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5007 * [Use small vectors in type walker][37760]
5008 * [Macro expansion performance was improved][37701]
5009 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5010 * [Replace FNV with a faster hash function][37229]
5015 * [`std::iter::Iterator::min_by`]
5016 * [`std::iter::Iterator::max_by`]
5017 * [`std::os::*::fs::FileExt`]
5018 * [`std::sync::atomic::Atomic*::get_mut`]
5019 * [`std::sync::atomic::Atomic*::into_inner`]
5020 * [`std::vec::IntoIter::as_slice`]
5021 * [`std::vec::IntoIter::as_mut_slice`]
5022 * [`std::sync::mpsc::Receiver::try_iter`]
5023 * [`std::os::unix::process::CommandExt::before_exec`]
5024 * [`std::rc::Rc::strong_count`]
5025 * [`std::rc::Rc::weak_count`]
5026 * [`std::sync::Arc::strong_count`]
5027 * [`std::sync::Arc::weak_count`]
5028 * [`std::char::encode_utf8`]
5029 * [`std::char::encode_utf16`]
5030 * [`std::cell::Ref::clone`]
5031 * [`std::io::Take::into_inner`]
5036 * [The standard sorting algorithm has been rewritten for dramatic performance
5037 improvements][38192]. It is a hybrid merge sort, drawing influences from
5038 Timsort. Previously it was a naive merge sort.
5039 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5040 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5042 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5043 and `char_indices().last()`][37882]
5044 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5045 * [Chinese characters display correctly in `fmt::Debug`][37855]
5046 * [Derive `Default` for `Duration`][37699]
5047 * [Support creation of anonymous pipes on WinXP/2k][37677]
5048 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5049 * [Don't pass overlapped handles to processes][38835]
5054 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5055 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5056 should instead check the variable at runtime with `std::env`. That the value
5057 was set at build time was a bug, and incorrect when cross-compiling. This
5058 change is known to cause breakage.
5059 * [Add `--all` flag to `cargo test`][cargo/3221]
5060 * [Compile statically against the MSVC CRT][cargo/3363]
5061 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5062 * [Link OpenSSL statically on OSX][cargo/3311]
5063 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5064 * [Test for bad path overrides with summaries][cargo/3336]
5065 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5066 * [Fix retrying crate downloads for network errors][cargo/3348]
5067 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5068 * [Emit more info on --message-format=json][cargo/3319]
5069 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5070 * [Don't ignore errors in workspace manifest][cargo/3409]
5071 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5076 * [Test runners (binaries built with `--test`) now support a `--list` argument
5077 that lists the tests it contains][38185]
5078 * [Test runners now support a `--exact` argument that makes the test filter
5079 match exactly, instead of matching only a substring of the test name][38181]
5080 * [rustdoc supports a `--playground-url` flag][37763]
5081 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5086 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5087 continue to be used in this release by passing `--disable-rustbuild` to the
5088 configure script, but they will be deleted soon. Note that the new build
5089 system uses a different on-disk layout that will likely affect any scripts
5091 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5093 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5094 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5100 * [A number of minor changes to name resolution have been activated][37127].
5101 They add up to more consistent semantics, allowing for future evolution of
5102 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5103 details of what is different. The breaking changes here have been transitioned
5104 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5105 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5106 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5107 should instead check the variable at runtime with `std::env`. That the value
5108 was set at build time was a bug, and incorrect when cross-compiling. This
5109 change is known to cause breakage.
5110 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5111 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5112 1.10 and is now an error by default. It will become a hard error in the near
5114 * [The semantics relating modules to file system directories are changing in
5115 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5116 lint, which is a warning in this release, and will become a hard error in the
5118 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5119 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5120 the underlying iterator][37834]
5122 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5123 [33685]: https://github.com/rust-lang/rust/issues/33685
5124 [36868]: https://github.com/rust-lang/rust/pull/36868
5125 [37127]: https://github.com/rust-lang/rust/pull/37127
5126 [37229]: https://github.com/rust-lang/rust/pull/37229
5127 [37456]: https://github.com/rust-lang/rust/pull/37456
5128 [37527]: https://github.com/rust-lang/rust/pull/37527
5129 [37602]: https://github.com/rust-lang/rust/pull/37602
5130 [37613]: https://github.com/rust-lang/rust/pull/37613
5131 [37615]: https://github.com/rust-lang/rust/pull/37615
5132 [37636]: https://github.com/rust-lang/rust/pull/37636
5133 [37627]: https://github.com/rust-lang/rust/pull/37627
5134 [37642]: https://github.com/rust-lang/rust/pull/37642
5135 [37677]: https://github.com/rust-lang/rust/pull/37677
5136 [37699]: https://github.com/rust-lang/rust/pull/37699
5137 [37701]: https://github.com/rust-lang/rust/pull/37701
5138 [37705]: https://github.com/rust-lang/rust/pull/37705
5139 [37749]: https://github.com/rust-lang/rust/pull/37749
5140 [37760]: https://github.com/rust-lang/rust/pull/37760
5141 [37763]: https://github.com/rust-lang/rust/pull/37763
5142 [37764]: https://github.com/rust-lang/rust/pull/37764
5143 [37789]: https://github.com/rust-lang/rust/pull/37789
5144 [37791]: https://github.com/rust-lang/rust/pull/37791
5145 [37814]: https://github.com/rust-lang/rust/pull/37814
5146 [37817]: https://github.com/rust-lang/rust/pull/37817
5147 [37834]: https://github.com/rust-lang/rust/pull/37834
5148 [37848]: https://github.com/rust-lang/rust/pull/37848
5149 [37855]: https://github.com/rust-lang/rust/pull/37855
5150 [37882]: https://github.com/rust-lang/rust/pull/37882
5151 [37888]: https://github.com/rust-lang/rust/pull/37888
5152 [37973]: https://github.com/rust-lang/rust/pull/37973
5153 [37979]: https://github.com/rust-lang/rust/pull/37979
5154 [38086]: https://github.com/rust-lang/rust/pull/38086
5155 [38107]: https://github.com/rust-lang/rust/pull/38107
5156 [38117]: https://github.com/rust-lang/rust/pull/38117
5157 [38134]: https://github.com/rust-lang/rust/pull/38134
5158 [38146]: https://github.com/rust-lang/rust/pull/38146
5159 [38181]: https://github.com/rust-lang/rust/pull/38181
5160 [38182]: https://github.com/rust-lang/rust/pull/38182
5161 [38185]: https://github.com/rust-lang/rust/pull/38185
5162 [38192]: https://github.com/rust-lang/rust/pull/38192
5163 [38279]: https://github.com/rust-lang/rust/pull/38279
5164 [38835]: https://github.com/rust-lang/rust/pull/38835
5165 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5166 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5167 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5168 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5169 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5170 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5171 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5172 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5173 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5174 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5175 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5176 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5177 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5178 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5179 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5180 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5181 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5182 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5183 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5184 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5185 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5186 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5187 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5188 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5189 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5190 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5191 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5192 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5193 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5194 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5195 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5196 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5197 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5198 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5199 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5200 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5201 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5202 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5205 Version 1.14.0 (2016-12-22)
5206 ===========================
5211 * [`..` matches multiple tuple fields in enum variants, structs
5212 and tuples][36843]. [RFC 1492].
5213 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5214 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5215 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5216 dereferencing][36822]
5221 * [Mark enums with non-zero discriminant as non-zero][37224]
5222 * [Lower-case `static mut` names are linted like other
5223 statics and consts][37162]
5224 * [Fix ICE on some macros in const integer positions
5225 (e.g. `[u8; m!()]`)][36819]
5226 * [Improve error message and snippet for "did you mean `x`"][36798]
5227 * [Add a panic-strategy field to the target specification][36794]
5228 * [Include LLVM version in `--version --verbose`][37200]
5230 Compile-time Optimizations
5231 --------------------------
5233 * [Improve macro expansion performance][37569]
5234 * [Shrink `Expr_::ExprInlineAsm`][37445]
5235 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5236 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5237 * [Avoid more allocations when compiling html5ever][37373]
5238 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5239 * [Avoid some allocations in the macro parser][37318]
5240 * [Use a faster deflate setting][37298]
5241 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5242 during interning of slices][37270]
5243 * [Optimize `write_metadata`][37267]
5244 * [Don't process obligation forest cycles when stalled][37231]
5245 * [Avoid many `CrateConfig` clones][37161]
5246 * [Optimize `Substs::super_fold_with`][37108]
5247 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5248 * [Speed up `plug_leaks`][36917]
5253 * [`println!()`, with no arguments, prints newline][36825].
5254 Previously, an empty string was required to achieve the same.
5255 * [`Wrapping` impls standard binary and unary operators, as well as
5256 the `Sum` and `Product` iterators][37356]
5257 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5259 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5260 `VecDeque` iterators][37315]
5261 * [Improve `SipHasher` performance on small values][37312]
5262 * [Add Iterator trait TrustedLen to enable better FromIterator /
5264 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5265 * [`ReadDir` implements `Debug`][37221]
5266 * [Implement `RefUnwindSafe` for atomic types][37178]
5267 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5268 * [Avoid allocations in `Decoder::read_str`][37064]
5269 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5270 * [Impl `Debug` for raw pointers to unsized data][36880]
5271 * [Don't reuse `HashMap` random seeds][37470]
5272 * [The internal memory layout of `HashMap` is more cache-friendly, for
5273 significant improvements in some operations][36692]
5274 * [`HashMap` uses less memory on 32-bit architectures][36595]
5275 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5280 * [Expose rustc cfg values to build scripts][cargo/3243]
5281 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5282 * [Fix passing --features when testing multiple packages][cargo/3280]
5283 * [Use a single profile set per workspace][cargo/3249]
5284 * [Load `replace` sections from lock files][cargo/3220]
5285 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5290 * [rustup is the recommended Rust installation method][1.14rustup]
5291 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5292 S390x. These are [tier 2] platforms and may have major defects. Follow the
5293 instructions on the website to install, or add the targets to an existing
5294 installation with `rustup target add`. The new target triples are:
5295 - `mips-unknown-linux-gnu`
5296 - `mipsel-unknown-linux-gnu`
5297 - `mips64-unknown-linux-gnuabi64`
5298 - `mips64el-unknown-linux-gnuabi64 `
5299 - `powerpc-unknown-linux-gnu`
5300 - `powerpc64-unknown-linux-gnu`
5301 - `powerpc64le-unknown-linux-gnu`
5302 - `s390x-unknown-linux-gnu `
5303 * This release includes target (std) builds for ARM Linux running MUSL
5304 libc. These are [tier 2] platforms and may have major defects. Add the
5305 following triples to an existing rustup installation with `rustup target add`:
5306 - `arm-unknown-linux-musleabi`
5307 - `arm-unknown-linux-musleabihf`
5308 - `armv7-unknown-linux-musleabihf`
5309 * This release includes [experimental support for WebAssembly][1.14wasm], via
5310 the `wasm32-unknown-emscripten` target. This target is known to have major
5311 defects. Please test, report, and fix.
5312 * rustup no longer installs documentation by default. Run `rustup
5313 component add rust-docs` to install.
5314 * [Fix line stepping in debugger][37310]
5315 * [Enable line number debuginfo in releases][37280]
5320 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5321 * [Add support for Fuchsia OS][37313]
5322 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5327 * [A number of forward-compatibility lints used by the compiler
5328 to gradually introduce language changes have been converted
5329 to deny by default][36894]:
5330 - ["use of inaccessible extern crate erroneously allowed"][36886]
5331 - ["type parameter default erroneously allowed in invalid location"][36887]
5332 - ["detects super or self keywords at the beginning of global path"][36888]
5333 - ["two overlapping inherent impls define an item with the same name
5334 were erroneously allowed"][36889]
5335 - ["floating-point constants cannot be used in patterns"][36890]
5336 - ["constants of struct or enum type can only be used in a pattern if
5337 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5338 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5339 * [Prohibit patterns in trait methods without bodies][37378]
5340 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5341 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5342 * [The `$crate` macro variable is accepted in fewer locations][37213]
5343 * [Impls specifying extra region requirements beyond the trait
5344 they implement are rejected][37167]
5345 * [Enums may not be unsized][37111]. Unsized enums are intended to
5346 work but never have. For now they are forbidden.
5347 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5349 [tier 2]: https://forge.rust-lang.org/platform-support.html
5350 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5351 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5352 [36430]: https://github.com/rust-lang/rust/pull/36430
5353 [36595]: https://github.com/rust-lang/rust/pull/36595
5354 [36595]: https://github.com/rust-lang/rust/pull/36595
5355 [36692]: https://github.com/rust-lang/rust/pull/36692
5356 [36767]: https://github.com/rust-lang/rust/pull/36767
5357 [36794]: https://github.com/rust-lang/rust/pull/36794
5358 [36798]: https://github.com/rust-lang/rust/pull/36798
5359 [36819]: https://github.com/rust-lang/rust/pull/36819
5360 [36822]: https://github.com/rust-lang/rust/pull/36822
5361 [36825]: https://github.com/rust-lang/rust/pull/36825
5362 [36843]: https://github.com/rust-lang/rust/pull/36843
5363 [36880]: https://github.com/rust-lang/rust/pull/36880
5364 [36886]: https://github.com/rust-lang/rust/issues/36886
5365 [36887]: https://github.com/rust-lang/rust/issues/36887
5366 [36888]: https://github.com/rust-lang/rust/issues/36888
5367 [36889]: https://github.com/rust-lang/rust/issues/36889
5368 [36890]: https://github.com/rust-lang/rust/issues/36890
5369 [36891]: https://github.com/rust-lang/rust/issues/36891
5370 [36892]: https://github.com/rust-lang/rust/issues/36892
5371 [36894]: https://github.com/rust-lang/rust/pull/36894
5372 [36917]: https://github.com/rust-lang/rust/pull/36917
5373 [36993]: https://github.com/rust-lang/rust/pull/36993
5374 [37037]: https://github.com/rust-lang/rust/pull/37037
5375 [37064]: https://github.com/rust-lang/rust/pull/37064
5376 [37094]: https://github.com/rust-lang/rust/pull/37094
5377 [37108]: https://github.com/rust-lang/rust/pull/37108
5378 [37111]: https://github.com/rust-lang/rust/pull/37111
5379 [37161]: https://github.com/rust-lang/rust/pull/37161
5380 [37162]: https://github.com/rust-lang/rust/pull/37162
5381 [37167]: https://github.com/rust-lang/rust/pull/37167
5382 [37178]: https://github.com/rust-lang/rust/pull/37178
5383 [37200]: https://github.com/rust-lang/rust/pull/37200
5384 [37213]: https://github.com/rust-lang/rust/pull/37213
5385 [37221]: https://github.com/rust-lang/rust/pull/37221
5386 [37224]: https://github.com/rust-lang/rust/pull/37224
5387 [37230]: https://github.com/rust-lang/rust/pull/37230
5388 [37231]: https://github.com/rust-lang/rust/pull/37231
5389 [37247]: https://github.com/rust-lang/rust/pull/37247
5390 [37267]: https://github.com/rust-lang/rust/pull/37267
5391 [37270]: https://github.com/rust-lang/rust/pull/37270
5392 [37273]: https://github.com/rust-lang/rust/pull/37273
5393 [37280]: https://github.com/rust-lang/rust/pull/37280
5394 [37298]: https://github.com/rust-lang/rust/pull/37298
5395 [37306]: https://github.com/rust-lang/rust/pull/37306
5396 [37310]: https://github.com/rust-lang/rust/pull/37310
5397 [37312]: https://github.com/rust-lang/rust/pull/37312
5398 [37313]: https://github.com/rust-lang/rust/pull/37313
5399 [37315]: https://github.com/rust-lang/rust/pull/37315
5400 [37318]: https://github.com/rust-lang/rust/pull/37318
5401 [37322]: https://github.com/rust-lang/rust/pull/37322
5402 [37326]: https://github.com/rust-lang/rust/pull/37326
5403 [37351]: https://github.com/rust-lang/rust/pull/37351
5404 [37356]: https://github.com/rust-lang/rust/pull/37356
5405 [37367]: https://github.com/rust-lang/rust/pull/37367
5406 [37373]: https://github.com/rust-lang/rust/pull/37373
5407 [37378]: https://github.com/rust-lang/rust/pull/37378
5408 [37389]: https://github.com/rust-lang/rust/pull/37389
5409 [37392]: https://github.com/rust-lang/rust/pull/37392
5410 [37427]: https://github.com/rust-lang/rust/pull/37427
5411 [37439]: https://github.com/rust-lang/rust/pull/37439
5412 [37445]: https://github.com/rust-lang/rust/pull/37445
5413 [37470]: https://github.com/rust-lang/rust/pull/37470
5414 [37569]: https://github.com/rust-lang/rust/pull/37569
5415 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5416 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5417 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5418 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5419 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5420 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5421 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5424 Version 1.13.0 (2016-11-10)
5425 ===========================
5430 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5431 errors, like the `try!` macro, described in [RFC 0243].
5432 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5433 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5434 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5435 * [Fix lifetime rules for 'if' conditions][36029]
5436 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5441 * [Add the `-C link-arg` argument][36574]
5442 * [Remove the old AST-based backend from rustc_trans][35764]
5443 * [Don't enable NEON by default on armv7 Linux][35814]
5444 * [Fix debug line number info for macro expansions][35238]
5445 * [Do not emit "class method" debuginfo for types that are not
5446 DICompositeType][36008]
5447 * [Warn about multiple conflicting #[repr] hints][34623]
5448 * [When sizing DST, don't double-count nested struct prefixes][36351]
5449 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5450 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5451 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5452 * [Expand macros without recursing to avoid stack overflows][36214]
5457 * [Replace macro backtraces with labeled local uses][35702]
5458 * [Improve error message for misplaced doc comments][33922]
5459 * [Buffer unix and lock windows to prevent message interleaving][35975]
5460 * [Update lifetime errors to specifically note temporaries][36171]
5461 * [Special case a few colors for Windows][36178]
5462 * [Suggest `use self` when such an import resolves][36289]
5463 * [Be more specific when type parameter shadows primitive type][36338]
5464 * Many minor improvements
5466 Compile-time Optimizations
5467 --------------------------
5469 * [Compute and cache HIR hashes at beginning][35854]
5470 * [Don't hash types in loan paths][36004]
5471 * [Cache projections in trans][35761]
5472 * [Optimize the parser's last token handling][36527]
5473 * [Only instantiate #[inline] functions in codegen units referencing
5474 them][36524]. This leads to big improvements in cases where crates export
5475 define many inline functions without using them directly.
5476 * [Lazily allocate TypedArena's first chunk][36592]
5477 * [Don't allocate during default HashSet creation][36734]
5484 * [`overflowing_abs`]
5485 * [`RefCell::try_borrow`]
5486 * [`RefCell::try_borrow_mut`]
5491 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5492 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5494 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5495 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5496 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5497 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5498 * [Use arc4rand on FreeBSD][35884]
5499 * [memrchr: Correct aligned offset computation][35969]
5500 * [Improve Demangling of Rust Symbols][36059]
5501 * [Use monotonic time in condition variables][35048]
5502 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5503 * [Implement conversion traits for `char`][35755]
5504 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5505 * [Zero first byte of CString on drop][36264]
5506 * [Inherit overflow checks for sum and product][36372]
5507 * [Add missing Eq implementations][36423]
5508 * [Implement `Debug` for `DirEntry`][36631]
5509 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5511 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5512 * [Implement more traits for `std::io::ErrorKind`][35911]
5513 * [Optimize BinaryHeap bounds checking][36072]
5514 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5515 `extend_with_element`][36355]
5516 * [Fix overflow checking in unsigned pow()][34942]
5521 * This release includes security fixes to both curl and OpenSSL.
5522 * [Fix transitive doctests when panic=abort][cargo/3021]
5523 * [Add --all-features flag to cargo][cargo/3038]
5524 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5525 * [Don't parse the home directory more than once][cargo/3078]
5526 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5527 * [Update OpenSSL to 1.0.2j][cargo/3121]
5528 * [Add license and license_file to cargo metadata output][cargo/3110]
5529 * [Make crates-io registry URL optional in config; ignore all changes to
5530 source.crates-io][cargo/3089]
5531 * [Don't download dependencies from other platforms][cargo/3123]
5532 * [Build transitive dev-dependencies when needed][cargo/3125]
5533 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5534 * [Avoid updating registry when adding existing deps][cargo/3144]
5535 * [Warn about path overrides that won't work][cargo/3136]
5536 * [Use workspaces during `cargo install`][cargo/3146]
5537 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5538 * [Add --message-format flag][cargo/3000]
5539 * [Pass target environment for rustdoc][cargo/3205]
5540 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5541 * [Update curl and curl-sys][cargo/3241]
5542 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5547 * [rustdoc: Add the `--sysroot` argument][36586]
5548 * [rustdoc: Fix a couple of issues with the search results][35655]
5549 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5550 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5551 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5556 * [Remove unmaintained style guide][35124]
5557 * [Add s390x support][36369]
5558 * [Initial work at Haiku OS support][36727]
5559 * [Add mips-uclibc targets][35734]
5560 * [Crate-ify compiler-rt into compiler-builtins][35021]
5561 * [Add rustc version info (git hash + date) to dist tarball][36213]
5562 * Many documentation improvements
5567 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5568 * [Deny (by default) transmuting from fn item types to pointer-sized
5569 types][34923]. Continuing the long transition to zero-sized fn items,
5571 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5573 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5574 * [Fix lifetime rules for 'if' conditions][36029].
5575 * [Inherit overflow checks for sum and product][36372].
5576 * [Forbid user-defined macros named "macro_rules"][36730].
5578 [33922]: https://github.com/rust-lang/rust/pull/33922
5579 [34623]: https://github.com/rust-lang/rust/pull/34623
5580 [34923]: https://github.com/rust-lang/rust/pull/34923
5581 [34942]: https://github.com/rust-lang/rust/pull/34942
5582 [34982]: https://github.com/rust-lang/rust/pull/34982
5583 [35021]: https://github.com/rust-lang/rust/pull/35021
5584 [35048]: https://github.com/rust-lang/rust/pull/35048
5585 [35074]: https://github.com/rust-lang/rust/pull/35074
5586 [35124]: https://github.com/rust-lang/rust/pull/35124
5587 [35234]: https://github.com/rust-lang/rust/pull/35234
5588 [35238]: https://github.com/rust-lang/rust/pull/35238
5589 [35354]: https://github.com/rust-lang/rust/pull/35354
5590 [35559]: https://github.com/rust-lang/rust/pull/35559
5591 [35585]: https://github.com/rust-lang/rust/pull/35585
5592 [35627]: https://github.com/rust-lang/rust/pull/35627
5593 [35655]: https://github.com/rust-lang/rust/pull/35655
5594 [35702]: https://github.com/rust-lang/rust/pull/35702
5595 [35707]: https://github.com/rust-lang/rust/pull/35707
5596 [35728]: https://github.com/rust-lang/rust/pull/35728
5597 [35734]: https://github.com/rust-lang/rust/pull/35734
5598 [35755]: https://github.com/rust-lang/rust/pull/35755
5599 [35761]: https://github.com/rust-lang/rust/pull/35761
5600 [35764]: https://github.com/rust-lang/rust/pull/35764
5601 [35814]: https://github.com/rust-lang/rust/pull/35814
5602 [35854]: https://github.com/rust-lang/rust/pull/35854
5603 [35871]: https://github.com/rust-lang/rust/pull/35871
5604 [35884]: https://github.com/rust-lang/rust/pull/35884
5605 [35911]: https://github.com/rust-lang/rust/pull/35911
5606 [35969]: https://github.com/rust-lang/rust/pull/35969
5607 [35975]: https://github.com/rust-lang/rust/pull/35975
5608 [36004]: https://github.com/rust-lang/rust/pull/36004
5609 [36008]: https://github.com/rust-lang/rust/pull/36008
5610 [36014]: https://github.com/rust-lang/rust/pull/36014
5611 [36029]: https://github.com/rust-lang/rust/pull/36029
5612 [36059]: https://github.com/rust-lang/rust/pull/36059
5613 [36072]: https://github.com/rust-lang/rust/pull/36072
5614 [36101]: https://github.com/rust-lang/rust/pull/36101
5615 [36104]: https://github.com/rust-lang/rust/pull/36104
5616 [36171]: https://github.com/rust-lang/rust/pull/36171
5617 [36173]: https://github.com/rust-lang/rust/pull/36173
5618 [36178]: https://github.com/rust-lang/rust/pull/36178
5619 [36213]: https://github.com/rust-lang/rust/pull/36213
5620 [36214]: https://github.com/rust-lang/rust/pull/36214
5621 [36264]: https://github.com/rust-lang/rust/pull/36264
5622 [36266]: https://github.com/rust-lang/rust/pull/36266
5623 [36289]: https://github.com/rust-lang/rust/pull/36289
5624 [36338]: https://github.com/rust-lang/rust/pull/36338
5625 [36351]: https://github.com/rust-lang/rust/pull/36351
5626 [36355]: https://github.com/rust-lang/rust/pull/36355
5627 [36369]: https://github.com/rust-lang/rust/pull/36369
5628 [36372]: https://github.com/rust-lang/rust/pull/36372
5629 [36423]: https://github.com/rust-lang/rust/pull/36423
5630 [36482]: https://github.com/rust-lang/rust/pull/36482
5631 [36505]: https://github.com/rust-lang/rust/pull/36505
5632 [36524]: https://github.com/rust-lang/rust/pull/36524
5633 [36527]: https://github.com/rust-lang/rust/pull/36527
5634 [36551]: https://github.com/rust-lang/rust/pull/36551
5635 [36574]: https://github.com/rust-lang/rust/pull/36574
5636 [36586]: https://github.com/rust-lang/rust/pull/36586
5637 [36592]: https://github.com/rust-lang/rust/pull/36592
5638 [36631]: https://github.com/rust-lang/rust/pull/36631
5639 [36639]: https://github.com/rust-lang/rust/pull/36639
5640 [36721]: https://github.com/rust-lang/rust/pull/36721
5641 [36727]: https://github.com/rust-lang/rust/pull/36727
5642 [36730]: https://github.com/rust-lang/rust/pull/36730
5643 [36734]: https://github.com/rust-lang/rust/pull/36734
5644 [36754]: https://github.com/rust-lang/rust/pull/36754
5645 [36995]: https://github.com/rust-lang/rust/pull/36995
5646 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5647 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5648 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5649 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5650 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5651 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5652 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5653 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5654 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5655 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5656 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5657 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5658 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5659 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5660 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5661 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5662 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5663 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5664 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5665 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5666 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5667 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5668 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5669 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5670 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5671 [rustup]: https://www.rustup.rs
5672 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5673 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5674 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5675 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5676 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5677 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5678 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5681 Version 1.12.1 (2016-10-20)
5682 ===========================
5687 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5688 * [Confusion with double negation and booleans][36856]
5689 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5690 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5691 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5692 * [Corrupted memory after updated to 1.12][36936]
5693 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5694 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5695 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5697 [36381]: https://github.com/rust-lang/rust/issues/36381
5698 [36856]: https://github.com/rust-lang/rust/issues/36856
5699 [36875]: https://github.com/rust-lang/rust/issues/36875
5700 [36924]: https://github.com/rust-lang/rust/issues/36924
5701 [36926]: https://github.com/rust-lang/rust/issues/36926
5702 [36936]: https://github.com/rust-lang/rust/issues/36936
5703 [37026]: https://github.com/rust-lang/rust/issues/37026
5704 [37112]: https://github.com/rust-lang/rust/issues/37112
5705 [37153]: https://github.com/rust-lang/rust/issues/37153
5708 Version 1.12.0 (2016-09-29)
5709 ===========================
5714 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5715 This translation pass is far simpler than the previous AST->LLVM pass, and
5716 creates opportunities to perform new optimizations directly on the MIR. It
5717 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5718 * [`rustc` presents a new, more readable error format, along with
5719 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5720 Most common editors supporting Rust have been updated to work with it. It was
5721 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5726 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5727 This translation pass is far simpler than the previous AST->LLVM pass, and
5728 creates opportunities to perform new optimizations directly on the MIR. It
5729 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5730 * [Print the Rust target name, not the LLVM target name, with
5731 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5732 * [The computation of `TypeId` is correct in some cases where it was previously
5733 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5734 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5735 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5736 `--print relocation-models`, and `--print code-models` print the available
5737 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5738 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5739 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5740 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5741 These targets produce statically-linked binaries. There are no binary release
5747 * [`rustc` presents a new, more readable error format, along with
5748 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5749 Most common editors supporting Rust have been updated to work with it. It was
5750 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5751 * [In error descriptions, references are now described in plain English,
5752 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5753 * [In error type descriptions, unknown numeric types are named `{integer}` or
5754 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5755 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5760 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5761 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5762 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5763 useful](https://github.com/rust-lang/rust/pull/34908)
5764 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5765 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5766 * [Semicolons are properly required as statement delimiters inside
5767 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5768 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5773 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5774 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5775 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5776 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5777 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5778 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5779 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5780 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5781 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5782 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5783 Both on Unix and Windows.
5784 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5785 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5786 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5787 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5788 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5789 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5790 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5791 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5796 * [The `format!` macro and friends now allow a single argument to be formatted
5797 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5798 * [The lifetime bounds on `[T]::binary_search_by` and
5799 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5800 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5801 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5802 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5803 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5804 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5805 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5806 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5807 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5808 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5809 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5810 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5811 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5812 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5813 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5814 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5815 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5816 * [`mpsc::sync_channel` `Receiver`s return any available message before
5817 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5818 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5819 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5824 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5825 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5826 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5827 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5828 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5829 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5830 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5831 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5832 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5833 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5834 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5835 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5836 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5837 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5838 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5839 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5844 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5845 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5850 * [Test binaries now support a `--test-threads` argument to specify the number
5851 of threads used to run tests, and which acts the same as the
5852 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5853 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5854 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5855 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5856 * [Rust releases now come with source packages that can be installed by rustup
5857 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5858 The resulting source code can be used by tools and IDES, located in the
5859 sysroot under `lib/rustlib/src`.
5864 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5865 * Many minor improvements to the documentation.
5866 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5871 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5872 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5873 * [When formatting strings, if "precision" is specified, the "fill",
5874 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5875 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5878 Version 1.11.0 (2016-08-18)
5879 ===========================
5884 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5885 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5886 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5887 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5892 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5893 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5894 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5895 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5896 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5897 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5898 (in libcore - previously stabilized in libstd)
5899 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5900 (in libcore - previously stabilized in libstd)
5901 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5902 (in libcore - previously stabilized in libstd)
5903 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5904 (in libcore - previously stabilized in libstd)
5905 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5906 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5907 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5908 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5913 * [The `thread_local!` macro supports multiple definitions in a single
5914 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5915 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5916 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5917 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5918 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5919 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5920 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5921 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5926 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5927 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5928 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5929 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5930 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5931 and `-vv` prints warnings for all crates.
5932 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5933 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5934 This provides room for expansion by arbitrary tools.
5935 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5936 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5937 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5938 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5939 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5940 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5941 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5946 * [Caching projections speeds up type check dramatically for some
5947 workloads](https://github.com/rust-lang/rust/pull/33816)
5948 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5949 This hasher is faster, but is believed to provide sufficient
5950 protection from collision attacks.
5951 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5956 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5957 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5958 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5959 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5960 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5965 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5966 * [When emitting debug info, rustc emits frame pointers for closures,
5967 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5968 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5969 * Many more errors have been given error codes and extended
5971 * API documentation continues to be improved, with many new examples
5976 * [rustc no longer hangs when dependencies recursively re-export
5977 submodules](https://github.com/rust-lang/rust/pull/34542)
5978 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5979 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5980 rewritten](https://github.com/rust-lang/rust/pull/33895)
5981 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5982 No targets use this yet, but it works toward AVR support.
5987 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5988 * [The new follow-set rules that place restrictions on `macro_rules!`
5989 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5990 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5991 and has been a warning since 1.10.
5992 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5993 This causes breakage in some corner cases.
5996 Version 1.10.0 (2016-07-07)
5997 ===========================
6002 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6003 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6004 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6005 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6006 * [`panic!` can be converted to a runtime abort with the
6007 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6008 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6009 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6010 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6011 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6012 Note that Cargo does not yet directly support cdylibs.
6017 * `os::windows::fs::OpenOptionsExt::access_mode`
6018 * `os::windows::fs::OpenOptionsExt::share_mode`
6019 * `os::windows::fs::OpenOptionsExt::custom_flags`
6020 * `os::windows::fs::OpenOptionsExt::attributes`
6021 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6022 * `os::unix::fs::OpenOptionsExt::custom_flags`
6023 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6024 * `Default for sync::Weak`
6025 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6026 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6027 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6028 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6029 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6030 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6031 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6032 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6033 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6034 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6035 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6036 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6037 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6038 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6039 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6040 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6041 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6042 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6043 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6044 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6045 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6046 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6047 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6048 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6049 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6050 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6051 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6052 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6053 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6054 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6055 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6056 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6057 * Read/Write/RawFd impls for `UnixStream`
6058 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6059 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6060 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6061 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6062 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6063 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6064 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6065 * RawFd impls for `UnixListener`
6066 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6067 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6068 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6069 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6070 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6071 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6072 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6073 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6074 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6075 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6076 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6077 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6078 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6079 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6080 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6081 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6082 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6083 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6084 * RawFd impls for `UnixDatagram`
6085 * `{BTree,Hash}Map::values_mut`
6086 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6091 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6092 The semantics of this minor method are subtle and probably not what
6094 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6095 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6096 will fall back to `/dev/urandom` temporarily to avoid blocking
6097 during early boot](https://github.com/rust-lang/rust/pull/33086).
6098 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6099 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6100 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6101 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6102 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6103 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6104 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6108 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6109 This controls the runtime behavior of the `panic!` macro
6110 and can be either "unwind" (the default), or "abort".
6111 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6112 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6113 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6114 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6115 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6116 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6117 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6118 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6119 By default they are retried twice, which can be customized with the
6120 `net.retry` value in `.cargo/config`.
6121 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6122 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6123 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6124 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6125 Makes it possible to install multiple crates in parallel.
6126 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6127 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6128 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6129 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6130 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6131 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6136 * [rustc memory usage was reduced by refactoring the context used for
6137 type checking](https://github.com/rust-lang/rust/pull/33425).
6138 * [Speed up creation of `HashMap`s by caching the random keys used
6139 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6140 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6141 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6142 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6143 10x faster than the previous lookup tables.
6144 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6149 * Many incremental improvements to documentation and rustdoc.
6150 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6151 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6152 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6153 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6154 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6155 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6156 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6161 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6162 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6163 * [`std` no longer prints backtraces on platforms where the running
6164 module must be loaded with `env::current_exe`, which can't be relied
6165 on](https://github.com/rust-lang/rust/pull/33554).
6166 * This release includes std binaries for the i586-unknown-linux-gnu,
6167 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6168 i586 target is for old x86 hardware without SSE2, and the armv7
6169 target is for Android running on modern ARM architectures.
6170 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6171 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6172 * [On Unix the runtime aborts by calling `libc::abort` instead of
6173 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6174 * [Rust is now bootstrapped from the previous release of Rust,
6175 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6180 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6181 * [`target_env` for Linux ARM targets is just `gnu`, not
6182 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6183 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6184 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6185 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6186 Affects how macros are parsed.
6187 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6188 * [Feature-gated attributes on macro-generated macro invocations are
6189 now rejected](https://github.com/rust-lang/rust/pull/32791).
6190 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6191 This caused some minor changes to type inference.
6194 Version 1.9.0 (2016-05-26)
6195 ==========================
6200 * The `#[deprecated]` attribute when applied to an API will generate
6201 warnings when used. The warnings may be suppressed with
6202 `#[allow(deprecated)]`. [RFC 1270].
6203 * [`fn` item types are zero sized, and each `fn` names a unique
6204 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6205 `transmute` on a `fn` type will generate a warning for a few cycles,
6206 then will be converted to an error.
6207 * [Field and method resolution understand visibility, so private
6208 fields and methods cannot prevent the proper use of public fields
6209 and methods][1.9fv].
6210 * [The parser considers unicode codepoints in the
6211 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6217 * [`std::panic::catch_unwind`] (renamed from `recover`)
6218 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6219 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6220 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6221 * [`str::is_char_boundary`]
6222 * [`<*const T>::as_ref`]
6223 * [`<*mut T>::as_ref`]
6224 * [`<*mut T>::as_mut`]
6225 * [`AsciiExt::make_ascii_uppercase`]
6226 * [`AsciiExt::make_ascii_lowercase`]
6227 * [`char::decode_utf16`]
6228 * [`char::DecodeUtf16`]
6229 * [`char::DecodeUtf16Error`]
6230 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6231 * [`BTreeSet::take`]
6232 * [`BTreeSet::replace`]
6235 * [`HashSet::replace`]
6237 * [`OsString::with_capacity`]
6238 * [`OsString::clear`]
6239 * [`OsString::capacity`]
6240 * [`OsString::reserve`]
6241 * [`OsString::reserve_exact`]
6242 * [`OsStr::is_empty`]
6244 * [`std::os::unix::thread`]
6247 * [`JoinHandleExt::as_pthread_t`]
6248 * [`JoinHandleExt::into_pthread_t`]
6249 * [`HashSet::hasher`]
6250 * [`HashMap::hasher`]
6251 * [`CommandExt::exec`]
6252 * [`File::try_clone`]
6253 * [`SocketAddr::set_ip`]
6254 * [`SocketAddr::set_port`]
6255 * [`SocketAddrV4::set_ip`]
6256 * [`SocketAddrV4::set_port`]
6257 * [`SocketAddrV6::set_ip`]
6258 * [`SocketAddrV6::set_port`]
6259 * [`SocketAddrV6::set_flowinfo`]
6260 * [`SocketAddrV6::set_scope_id`]
6261 * [`slice::copy_from_slice`]
6262 * [`ptr::read_volatile`]
6263 * [`ptr::write_volatile`]
6264 * [`OpenOptions::create_new`]
6265 * [`TcpStream::set_nodelay`]
6266 * [`TcpStream::nodelay`]
6267 * [`TcpStream::set_ttl`]
6268 * [`TcpStream::ttl`]
6269 * [`TcpStream::set_only_v6`]
6270 * [`TcpStream::only_v6`]
6271 * [`TcpStream::take_error`]
6272 * [`TcpStream::set_nonblocking`]
6273 * [`TcpListener::set_ttl`]
6274 * [`TcpListener::ttl`]
6275 * [`TcpListener::set_only_v6`]
6276 * [`TcpListener::only_v6`]
6277 * [`TcpListener::take_error`]
6278 * [`TcpListener::set_nonblocking`]
6279 * [`UdpSocket::set_broadcast`]
6280 * [`UdpSocket::broadcast`]
6281 * [`UdpSocket::set_multicast_loop_v4`]
6282 * [`UdpSocket::multicast_loop_v4`]
6283 * [`UdpSocket::set_multicast_ttl_v4`]
6284 * [`UdpSocket::multicast_ttl_v4`]
6285 * [`UdpSocket::set_multicast_loop_v6`]
6286 * [`UdpSocket::multicast_loop_v6`]
6287 * [`UdpSocket::set_multicast_ttl_v6`]
6288 * [`UdpSocket::multicast_ttl_v6`]
6289 * [`UdpSocket::set_ttl`]
6290 * [`UdpSocket::ttl`]
6291 * [`UdpSocket::set_only_v6`]
6292 * [`UdpSocket::only_v6`]
6293 * [`UdpSocket::join_multicast_v4`]
6294 * [`UdpSocket::join_multicast_v6`]
6295 * [`UdpSocket::leave_multicast_v4`]
6296 * [`UdpSocket::leave_multicast_v6`]
6297 * [`UdpSocket::take_error`]
6298 * [`UdpSocket::connect`]
6299 * [`UdpSocket::send`]
6300 * [`UdpSocket::recv`]
6301 * [`UdpSocket::set_nonblocking`]
6306 * [`std::sync::Once` is poisoned if its initialization function
6308 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6309 * [Most types implement `fmt::Debug`][1.9db].
6310 * [The default buffer size used by `BufReader` and `BufWriter` was
6311 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6312 used by other languages.
6313 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6314 `Duration` additionally implements `*=` and `/=`][1.9ta].
6315 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6316 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6317 * [`Chain` implements `BufRead`][1.9ch].
6318 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6323 * [Cargo can now run concurrently][1.9cc].
6324 * [Top-level overrides allow specific revisions of crates to be
6325 overridden through the entire crate graph][1.9ct]. This is intended
6326 to make upgrades easier for large projects, by allowing crates to be
6327 forked temporarily until they've been upgraded and republished.
6328 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6329 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6330 on the commandline][1.9cf]. `rustc` arguments can also be specified
6331 in the `build.rustflags` configuration key.
6336 * [The time complexity of comparing variables for equivalence during type
6337 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6338 to major compilation time improvement in some scenarios.
6339 * [`ToString` is specialized for `str`, giving it the same performance
6340 as `to_owned`][1.9ts].
6341 * [Spawning processes with `Command::output` no longer creates extra
6343 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6344 for C-like enums][1.9cl].
6349 * [Passing the `--quiet` flag to a test runner will produce
6350 much-abbreviated output][1.9q].
6351 * The Rust Project now publishes std binaries for the
6352 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6353 `i586-pc-windows-msvc` targets.
6358 * [`std::sync::Once` is poisoned if its initialization function
6360 * [It is illegal to define methods with the same name in overlapping
6361 inherent `impl` blocks][1.9sn].
6362 * [`fn` item types are zero sized, and each `fn` names a unique
6363 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6364 `transmute` on a `fn` type will generate a warning for a few cycles,
6365 then will be converted to an error.
6366 * [Improvements to const evaluation may trigger new errors when integer
6367 literals are out of range][1.9ce].
6370 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6371 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6372 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6373 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6374 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6375 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6376 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6377 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6378 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6379 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6380 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6381 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6382 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6383 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6384 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6385 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6386 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6387 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6388 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6389 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6390 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6391 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6392 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6393 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6394 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6395 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6396 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6397 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6398 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6399 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6400 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6401 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6402 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6403 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6404 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6405 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6406 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6407 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6408 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6409 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6410 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6411 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6412 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6413 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6414 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6415 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6416 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6417 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6418 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6419 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6420 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6421 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6422 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6423 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6424 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6425 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6426 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6427 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6428 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6429 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6430 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6431 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6432 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6433 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6434 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6435 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6436 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6437 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6438 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6439 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6440 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6441 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6442 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6443 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6444 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6445 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6446 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6447 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6448 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6449 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6450 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6451 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6452 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6453 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6454 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6455 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6456 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6457 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6458 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6459 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6460 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6461 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6462 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6463 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6464 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6465 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6466 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6467 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6468 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6469 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6470 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6471 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6472 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6473 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6474 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6475 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6476 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6477 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6478 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6479 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6482 Version 1.8.0 (2016-04-14)
6483 ==========================
6488 * Rust supports overloading of compound assignment statements like
6489 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6490 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6491 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6493 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6494 addition to the non-braced form, `struct Foo;`. [RFC 218].
6500 * [`str::encode_utf16`] (renamed from `utf16_units`)
6501 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6504 * [`ptr::drop_in_place`]
6506 * [`time::SystemTime`]
6508 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6509 * [`Instant::elapsed`]
6510 * [`SystemTime::now`]
6511 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6512 * [`SystemTime::elapsed`]
6513 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6514 * [`SystemTimeError`]
6515 * [`SystemTimeError::duration`]
6516 * Various impls for `SystemTimeError`
6518 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6519 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6520 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6521 * [The `write!` and `writeln!` macros correctly emit errors if any of
6522 their arguments can't be formatted][1.8w].
6523 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6524 * [The Unix-specific `raw` modules, which contain a number of
6525 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6526 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6527 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6528 across platforms was making it difficult to implement `std`
6529 correctly. Those that need these definitions should use the `libc`
6531 * The Unix-specific `MetadataExt` traits, including
6532 `os::unix::fs::MetadataExt`, which expose values such as inode
6533 numbers [no longer return platform-specific types][1.8r], but
6534 instead return widened integers. [RFC 1415].
6535 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6536 * [Atomic loads and stores are not volatile][1.8a].
6537 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6542 * [Inlining hash functions lead to a 3% compile-time improvement in
6543 some workloads][1.8h].
6544 * When using jemalloc, its symbols are [unprefixed so that it
6545 overrides the libc malloc implementation][1.8h]. This means that for
6546 rustc, LLVM is now using jemalloc, which results in a 6%
6547 compile-time improvement on a specific workload.
6548 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6553 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6554 i686-pc-windows-msvc is now considered a tier-1 platform.
6555 * [The `--print targets` flag prints a list of supported targets][1.8t].
6556 * [The `--print cfg` flag prints the `cfg`s defined for the current
6558 * [`rustc` can be built with an new Cargo-based build system, written
6559 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6560 build system. To enable it configure with `configure --rustbuild`.
6561 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6562 variants while also indicating the total number of missing variants
6563 if more than 3][1.8m].
6564 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6565 * The Rust Project now publishes binary releases of the standard
6566 library for a number of tier-2 targets:
6567 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6568 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6569 `x86_64-rumprun-netbsd`. These can be installed with
6570 tools such as [multirust][1.8mr].
6575 * [`cargo init` creates a new Cargo project in the current
6576 directory][1.8ci]. It is otherwise like `cargo new`.
6577 * [Cargo has configuration keys for `-v` and
6578 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6579 `[term]` section of `.cargo/config`.
6580 * [Configuration keys that evaluate to strings or integers can be set
6581 via environment variables][1.8ce]. For example the `build.jobs` key
6582 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6583 precedence over config files.
6584 * [Target-specific dependencies support Rust `cfg` syntax for
6585 describing targets][1.8cfg] so that dependencies for multiple
6586 targets can be specified together. [RFC 1361].
6587 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6588 `RUSTDOC` take precedence over the `build.target-dir`,
6589 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6590 * [The child process tree is killed on Windows when Cargo is
6592 * [The `build.target` configuration value sets the target platform,
6593 like `--target`][1.8ct].
6598 * [Unstable compiler flags have been further restricted][1.8u]. Since
6599 1.0 `-Z` flags have been considered unstable, and other flags that
6600 were considered unstable additionally required passing `-Z
6601 unstable-options` to access. Unlike unstable language and library
6602 features though, these options have been accessible on the stable
6603 release channel. Going forward, *new unstable flags will not be
6604 available on the stable release channel*, and old unstable flags
6605 will warn about their usage. In the future, all unstable flags will
6606 be unavailable on the stable release channel.
6607 * [It is no longer possible to `match` on empty enum variants using
6608 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6609 * The Unix-specific `MetadataExt` traits, including
6610 `os::unix::fs::MetadataExt`, which expose values such as inode
6611 numbers [no longer return platform-specific types][1.8r], but
6612 instead return widened integers. [RFC 1415].
6613 * [Modules sourced from the filesystem cannot appear within arbitrary
6614 blocks, but only within other modules][1.8mf].
6615 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6616 * On Unix, [stack overflow triggers a runtime abort instead of a
6618 * [`Command::spawn` and its equivalents return an error if any of
6619 its command-line arguments contain interior `NUL`s][1.8n].
6620 * [Tuple and unit enum variants from other crates are in the type
6622 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6623 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6624 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6625 instead of `foo.lib`.
6628 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6629 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6630 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6631 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6632 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6633 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6634 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6635 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6636 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6637 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6638 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6639 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6640 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6641 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6642 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6643 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6644 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6645 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6646 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6647 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6648 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6649 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6650 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6651 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6652 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6653 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6654 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6655 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6656 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6657 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6658 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6659 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6660 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6661 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6662 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6663 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6664 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6665 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6666 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6667 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6668 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6669 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6670 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6671 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6672 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6673 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6674 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6675 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6676 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6677 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6678 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6679 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6680 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6681 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6682 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6683 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6684 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6685 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6686 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6687 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6690 Version 1.7.0 (2016-03-03)
6691 ==========================
6698 * [`Path::strip_prefix`] (renamed from relative_from)
6699 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6701 * [`Ipv4Addr::is_loopback`]
6702 * [`Ipv4Addr::is_private`]
6703 * [`Ipv4Addr::is_link_local`]
6704 * [`Ipv4Addr::is_multicast`]
6705 * [`Ipv4Addr::is_broadcast`]
6706 * [`Ipv4Addr::is_documentation`]
6708 * [`Ipv6Addr::is_unspecified`]
6709 * [`Ipv6Addr::is_loopback`]
6710 * [`Ipv6Addr::is_multicast`]
6713 * [`Vec::as_mut_slice`]
6715 * [`String::as_str`]
6716 * [`String::as_mut_str`]
6718 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6720 * `<[T]>::`[`sort_by_key`]
6721 * checked, saturated, and overflowing operations
6722 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6723 * [`i32::saturating_mul`]
6724 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6725 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6726 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6727 * [`u32::saturating_mul`]
6728 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6729 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6730 * and checked, saturated, and overflowing operations for other primitive types
6732 * [`ffi::IntoStringError`]
6733 * [`CString::into_string`]
6734 * [`CString::into_bytes`]
6735 * [`CString::into_bytes_with_nul`]
6736 * `From<CString> for Vec<u8>`
6738 * [`IntoStringError::into_cstring`]
6739 * [`IntoStringError::utf8_error`]
6740 * `Error for IntoStringError`
6742 * [`std::hash::BuildHasher`]
6743 * [`BuildHasher::Hasher`]
6744 * [`BuildHasher::build_hasher`]
6745 * [`std::hash::BuildHasherDefault`]
6746 * [`HashMap::with_hasher`]
6747 * [`HashMap::with_capacity_and_hasher`]
6748 * [`HashSet::with_hasher`]
6749 * [`HashSet::with_capacity_and_hasher`]
6750 * [`std::collections::hash_map::RandomState`]
6751 * [`RandomState::new`]
6752 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6753 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6754 from bytes is faster.
6755 * [The performance of `LineWriter` (and thus `io::stdout`) was
6756 improved by using `memchr` to search for newlines][1.7m].
6757 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6758 `f64` variants were stabilized previously.
6759 * [`BTreeMap` was rewritten to use less memory and improve the performance
6760 of insertion and iteration, the latter by as much as 5x][1.7bm].
6761 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6762 covariant over their contained type][1.7bt].
6763 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6764 over their contained type][1.7ll].
6765 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6767 * [`Any` is implemented for unsized types][1.7a].
6768 * [`Hash` is implemented for `Duration`][1.7h].
6773 * [When running tests with `--test`, rustdoc will pass `--cfg`
6774 arguments to the compiler][1.7dt].
6775 * [The compiler is built with RPATH information by default][1.7rpa].
6776 This means that it will be possible to run `rustc` when installed in
6777 unusual configurations without configuring the dynamic linker search
6779 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6780 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6781 over `LD_LIBRARY_PATH`.
6786 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6787 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6788 * [The `rerun-if-changed` build script directive no longer causes the
6789 build script to incorrectly run twice in certain scenarios][1.7rr].
6794 * Soundness fixes to the interactions between associated types and
6795 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6796 code that violates the new rules. This is a significant change that
6797 is known to break existing code, so it has emitted warnings for the
6798 new error cases since 1.4 to give crate authors time to adapt. The
6799 details of what is changing are subtle; read the RFC for more.
6800 * [Several bugs in the compiler's visibility calculations were
6801 fixed][1.7v]. Since this was found to break significant amounts of
6802 code, the new errors will be emitted as warnings for several release
6803 cycles, under the `private_in_public` lint.
6804 * Defaulted type parameters were accidentally accepted in positions
6805 that were not intended. In this release, [defaulted type parameters
6806 appearing outside of type definitions will generate a
6807 warning][1.7d], which will become an error in future releases.
6808 * [Parsing "." as a float results in an error instead of 0][1.7p].
6809 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6810 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6812 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6813 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6814 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6815 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6816 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6817 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6818 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6819 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6820 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6821 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6822 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6823 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6824 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6825 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6826 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6827 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6828 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6829 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6830 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6831 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6832 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6833 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6834 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6835 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6836 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6837 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6838 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6839 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6840 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6841 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6842 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6843 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6844 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6845 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6846 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6847 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6848 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6849 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6850 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6851 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6852 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6853 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6854 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6855 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6856 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6857 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6858 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6859 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6860 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6861 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6862 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6863 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6864 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6865 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6866 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6867 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6868 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6869 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6870 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6871 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6872 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6873 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6874 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6875 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6876 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6877 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6878 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6879 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6880 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6881 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6882 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6883 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6884 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6885 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6886 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6887 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6888 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6889 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6890 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6893 Version 1.6.0 (2016-01-21)
6894 ==========================
6899 * The `#![no_std]` attribute causes a crate to not be linked to the
6900 standard library, but only the [core library][1.6co], as described
6901 in [RFC 1184]. The core library defines common types and traits but
6902 has no platform dependencies whatsoever, and is the basis for Rust
6903 software in environments that cannot support a full port of the
6904 standard library, such as operating systems. Most of the core
6905 library is now stable.
6911 [`Read::read_exact`],
6912 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6913 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6914 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6915 [`os::unix::fs::DirBuilderExt`],
6916 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6917 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6918 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6919 [`collections::hash_map::Drain`],
6920 [`collections::hash_map::HashMap::drain`],
6921 [`collections::hash_set::Drain`],
6922 [`collections::hash_set::HashSet::drain`],
6923 [`collections::binary_heap::Drain`],
6924 [`collections::binary_heap::BinaryHeap::drain`],
6925 [`Vec::extend_from_slice`] (renamed from `push_all`),
6926 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6927 [`RwLock::into_inner`],
6928 [`Iterator::min_by_key`] (renamed from `min_by`),
6929 [`Iterator::max_by_key`] (renamed from `max_by`).
6930 * The [core library][1.6co] is stable, as are most of its APIs.
6931 * [The `assert_eq!` macro supports arguments that don't implement
6932 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6934 * Several timer functions that take duration in milliseconds [are
6935 deprecated in favor of those that take `Duration`][1.6ms]. These
6936 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6937 `thread::park_timeout_ms`.
6938 * The algorithm by which `Vec` reserves additional elements was
6939 [tweaked to not allocate excessive space][1.6a] while still growing
6941 * `From` conversions are [implemented from integers to floats][1.6f]
6942 in cases where the conversion is lossless. Thus they are not
6943 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6944 or `f64`. They are also not implemented for `isize` and `usize`
6945 because the implementations would be platform-specific. `From` is
6946 also implemented from `f32` to `f64`.
6947 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6948 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6949 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6950 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6952 * Sorting slices that are already sorted [is 50% faster in some
6958 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6959 * Cargo build scripts can specify their dependencies by emitting the
6960 [`rerun-if-changed`][1.6rr] key.
6961 * crates.io will reject publication of crates with dependencies that
6962 have a wildcard version constraint. Crates with wildcard
6963 dependencies were seen to cause a variety of problems, as described
6964 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6966 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6967 release folder. A variety of artifacts that Cargo failed to clean
6968 are now correctly deleted.
6973 * The `unreachable_code` lint [warns when a function call's argument
6975 * The parser indicates [failures that may be caused by
6976 confusingly-similar Unicode characters][1.6uc]
6977 * Certain macro errors [are reported at definition time][1.6m], not
6983 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6984 environment variable when locating crates. This was a pre-cargo
6985 feature for integrating with the package manager that was
6986 accidentally never removed.
6987 * [A number of bugs were fixed in the privacy checker][1.6p] that
6988 could cause previously-accepted code to break.
6989 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6990 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6991 struct pattern syntax (`Foo(..)`) can no longer be used to match
6992 unit structs. This is a warning now, but will become an error in
6993 future releases. Patterns that share the same name as a const are
6995 * A bug was fixed that causes [rustc not to apply default type
6996 parameters][1.6xc] when resolving certain method implementations of
6997 traits defined in other crates.
6999 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7000 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7001 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7002 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7003 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7004 [1.6co]: http://doc.rust-lang.org/core/index.html
7005 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7006 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7007 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7008 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7009 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7010 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7011 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7012 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7013 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7014 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7015 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7016 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7017 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7018 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7019 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7020 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7021 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7022 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7023 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7024 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7025 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7026 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7027 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7028 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7029 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7030 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7031 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7032 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7033 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7034 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7035 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7036 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7037 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7038 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7039 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7040 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7041 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7042 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7043 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7044 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7045 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7048 Version 1.5.0 (2015-12-10)
7049 ==========================
7051 * ~700 changes, numerous bugfixes
7057 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7058 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7059 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7060 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7061 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7062 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7063 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7064 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7065 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7066 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7067 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7068 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7069 [`Path::read_link`], [`Path::symlink_metadata`],
7070 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7071 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7072 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7073 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7074 [`slice::split_first_mut`], [`slice::split_first`],
7075 [`slice::split_last_mut`], [`slice::split_last`],
7076 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7077 [`str::MatchIndices`], [`str::RMatchIndices`],
7078 [`str::match_indices`], [`str::rmatch_indices`],
7079 [`str::slice_mut_unchecked`], [`string::ParseError`].
7080 * Rust applications hosted on crates.io can be installed locally to
7081 `~/.cargo/bin` with the [`cargo install`] command. Among other
7082 things this makes it easier to augment Cargo with new subcommands:
7083 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7084 invoked as `cargo foo`.
7085 * Crates with wildcard (`*`) dependencies will [emit warnings when
7086 published][1.5w]. In 1.6 it will no longer be possible to publish
7087 crates with wildcard dependencies.
7092 * The rules determining when a particular lifetime must outlive
7093 a particular value (known as '[dropck]') have been [modified
7094 to not rely on parametricity][1.5p].
7095 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7096 and `Arc`][1.5a]. Because these smart pointer types implement
7097 `Deref`, this causes breakage in cases where the interior type
7098 contains methods of the same name.
7099 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7100 that they could drop their content. Soundness fix.
7101 * All method invocations are [properly checked][1.5wf1] for
7102 [well-formedness][1.5wf2]. Soundness fix.
7103 * Traits whose supertraits contain `Self` are [not object
7104 safe][1.5o]. Soundness fix.
7105 * Target specifications support a [`no_default_libraries`][1.5nd]
7106 setting that controls whether `-nodefaultlibs` is passed to the
7107 linker, and in turn the `is_like_windows` setting no longer affects
7108 the `-nodefaultlibs` flag.
7109 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7110 * The `#[inline]` and `#[repr]` attributes [can only appear
7111 in valid locations][1.5at].
7112 * Native libraries linked from the local crate are [passed to
7113 the linker before native libraries from upstream crates][1.5nl].
7114 * Two rarely-used attributes, `#[no_debug]` and
7115 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7116 * Negation of unsigned integers, which has been a warning for
7117 several releases, [is now behind a feature gate and will
7118 generate errors][1.5nu].
7119 * The parser accidentally accepted visibility modifiers on
7120 enum variants, a bug [which has been fixed][1.5ev].
7121 * [A bug was fixed that allowed `use` statements to import unstable
7127 * When evaluating expressions at compile-time that are not
7128 compile-time constants (const-evaluating expressions in non-const
7129 contexts), incorrect code such as overlong bitshifts and arithmetic
7130 overflow will [generate a warning instead of an error][1.5ce],
7131 delaying the error until runtime. This will allow the
7132 const-evaluator to be expanded in the future backwards-compatibly.
7133 * The `improper_ctypes` lint [no longer warns about using `isize` and
7134 `usize` in FFI][1.5ict].
7139 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7141 * `Default` is [implemented for mutable slices][1.5d].
7142 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7143 * There are now `From` conversions [between floating point
7144 types][1.5f] where the conversions are lossless.
7145 * There are now `From` conversions [between integer types][1.5i] where
7146 the conversions are lossless.
7147 * [`fs::Metadata` implements `Clone`][1.5fs].
7148 * The `parse` method [accepts a leading "+" when parsing
7150 * [`AsMut` is implemented for `Vec`][1.5am].
7151 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7152 been optimized][1.5cf] and no longer rely on the default impl.
7153 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7154 `unsafe extern "C"` function types now [implement `Clone`,
7155 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7156 `fmt::Debug` for up to 12 arguments][1.5fp].
7157 * [Dropping `Vec`s is much faster in unoptimized builds when the
7158 element types don't implement `Drop`][1.5dv].
7159 * A bug that caused in incorrect behavior when [combining `VecDeque`
7160 with zero-sized types][1.5vdz] was resolved.
7161 * [`PartialOrd` for slices is faster][1.5po].
7166 * [Crate metadata size was reduced by 20%][1.5md].
7167 * [Improvements to code generation reduced the size of libcore by 3.3
7168 MB and rustc's memory usage by 18MB][1.5m].
7169 * [Improvements to deref translation increased performance in
7170 unoptimized builds][1.5dr].
7171 * Various errors in trait resolution [are deduplicated to only be
7172 reported once][1.5te].
7173 * Rust has preliminary [support for rumprun kernels][1.5rr].
7174 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7176 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7177 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7178 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7179 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7180 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7181 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7182 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7183 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7184 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7185 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7186 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7187 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7188 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7189 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7190 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7191 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7192 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7193 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7194 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7195 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7196 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7197 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7198 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7199 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7200 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7201 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7202 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7203 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7204 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7205 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7206 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7207 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7208 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7209 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7210 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7211 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7212 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7213 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7214 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7215 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7216 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7217 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7218 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7219 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7220 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7221 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7222 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7223 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7224 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7225 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7226 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7227 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7228 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7229 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7230 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7231 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7232 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7233 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7234 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7235 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7236 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7237 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7238 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7239 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7240 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7241 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7242 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7243 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7244 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7245 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7246 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7247 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7248 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7249 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7250 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7251 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7252 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7253 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7254 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7255 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7256 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7257 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7258 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7259 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7260 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7261 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7262 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7263 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7264 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7266 Version 1.4.0 (2015-10-29)
7267 ==========================
7269 * ~1200 changes, numerous bugfixes
7274 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7275 GNU) are now supported and recommended for use.
7280 * [Several changes have been made to fix type soundness and improve
7281 the behavior of associated types][sound]. See [RFC 1214]. Although
7282 we have mostly introduced these changes as warnings this release, to
7283 become errors next release, there are still some scenarios that will
7284 see immediate breakage.
7285 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7286 line breaks in addition to `\n`][crlf].
7287 * [Loans of `'static` lifetime extend to the end of a function][stat].
7288 * [`str::parse` no longer introduces avoidable rounding error when
7289 parsing floating point numbers. Together with earlier changes to
7290 float formatting/output, "round trips" like f.to_string().parse()
7291 now preserve the value of f exactly. Additionally, leading plus
7292 signs are now accepted][fp3].
7298 * `use` statements that import multiple items [can now rename
7299 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7300 * [Binops work correctly on fat pointers][binfat].
7301 * `pub extern crate`, which does not behave as expected, [issues a
7302 warning][pec] until a better solution is found.
7307 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7308 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7309 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7310 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7311 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7312 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7313 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7314 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7315 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7316 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7317 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7318 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7319 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7320 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7321 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7322 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7323 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7324 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7326 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7327 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7328 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7329 `f64::from_str_radix`.
7330 * [Reverse-searching strings is faster with the 'two-way'
7332 * [`std::io::copy` allows `?Sized` arguments][cc].
7333 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7334 [override `count`, `nth` and `last` with an O(1)
7335 implementation][it].
7336 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7337 * [`IntoRawFd` has been added to the Unix-specific prelude,
7338 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7340 * [`Extend<String>` and `FromIterator<String` are both implemented for
7342 * [`IntoIterator` is implemented for references to `Option` and
7344 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7345 Copy`][ext] as part of [RFC 839]. This will cause type inference
7346 breakage in rare situations.
7347 * [`BinaryHeap` implements `Debug`][bh2].
7348 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7350 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7351 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7352 * [String comparison is faster][faststr].
7353 * `&mut T` where `T: std::fmt::Write` [also implements
7354 `std::fmt::Write`][mutw].
7355 * [A stable regression in `VecDeque::push_back` and other
7356 capacity-altering methods that caused panics for zero-sized types
7358 * [Function pointers implement traits for up to 12 parameters][fp2].
7363 * The compiler [no longer uses the 'morestack' feature to prevent
7364 stack overflow][mm]. Instead it uses guard pages and stack
7365 probes (though stack probes are not yet implemented on any platform
7367 * [The compiler matches traits faster when projections are involved][p].
7368 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7370 * [Cargo now displays useful information about what its doing during
7371 `cargo update`][cu].
7373 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7374 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7375 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7376 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7377 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7378 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7379 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7380 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7381 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7382 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7383 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7384 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7385 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7386 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7387 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7388 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7389 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7390 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7391 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7392 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7393 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7394 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7395 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7396 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7397 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7398 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7399 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7400 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7401 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7402 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7403 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7404 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7405 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7406 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7407 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7408 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7409 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7410 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7411 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7412 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7413 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7414 [bh2]: https://github.com/rust-lang/rust/pull/28156
7415 [binfat]: https://github.com/rust-lang/rust/pull/28270
7416 [bm]: https://github.com/rust-lang/rust/pull/28197
7417 [cc]: https://github.com/rust-lang/rust/pull/27531
7418 [crlf]: https://github.com/rust-lang/rust/pull/28034
7419 [cu]: https://github.com/rust-lang/cargo/pull/1931
7420 [d]: https://github.com/rust-lang/rust/pull/27825
7421 [dep]: https://github.com/rust-lang/rust/pull/28339
7422 [es]: https://github.com/rust-lang/rust/pull/27956
7423 [ext]: https://github.com/rust-lang/rust/pull/28094
7424 [faststr]: https://github.com/rust-lang/rust/pull/28338
7425 [ffi]: https://github.com/rust-lang/rust/pull/28779
7426 [fp]: https://github.com/rust-lang/rust/pull/28268
7427 [fp2]: https://github.com/rust-lang/rust/pull/28560
7428 [fp3]: https://github.com/rust-lang/rust/pull/27307
7429 [i]: https://github.com/rust-lang/rust/pull/27451
7430 [into2]: https://github.com/rust-lang/rust/pull/28039
7431 [it]: https://github.com/rust-lang/rust/pull/27652
7432 [mm]: https://github.com/rust-lang/rust/pull/27338
7433 [mutw]: https://github.com/rust-lang/rust/pull/28368
7434 [sound]: https://github.com/rust-lang/rust/pull/27641
7435 [p]: https://github.com/rust-lang/rust/pull/27866
7436 [pec]: https://github.com/rust-lang/rust/pull/28486
7437 [pr]: https://github.com/rust-lang/rust/pull/27896
7438 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7439 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7440 [s]: https://github.com/rust-lang/rust/pull/27474
7441 [stab]: https://github.com/rust-lang/rust/pull/28339
7442 [stat]: https://github.com/rust-lang/rust/pull/28321
7443 [vd]: https://github.com/rust-lang/rust/pull/28494
7445 Version 1.3.0 (2015-09-17)
7446 ==============================
7448 * ~900 changes, numerous bugfixes
7453 * The [new object lifetime defaults][nold] have been [turned
7454 on][nold2] after a cycle of warnings about the change. Now types
7455 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7456 being interpreted as `&'a Box<Trait+'a>` to `&'a
7457 Box<Trait+'static>`.
7458 * [The Rustonomicon][nom] is a new book in the official documentation
7459 that dives into writing unsafe Rust.
7460 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7461 timekeeping is employed by other std APIs, as well as out-of-tree
7467 * The [new object lifetime defaults][nold] have been [turned
7468 on][nold2] after a cycle of warnings about the change.
7469 * There is a known [regression][lr] in how object lifetime elision is
7470 interpreted, the proper solution for which is undetermined.
7471 * The `#[prelude_import]` attribute, an internal implementation
7472 detail, was accidentally stabilized previously. [It has been put
7473 behind the `prelude_import` feature gate][pi]. This change is
7474 believed to break no existing code.
7475 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7476 [more sane for dynamically sized types][dst3]. Code that relied on
7477 the previous behavior is thought to be broken.
7478 * The `dropck` rules, which checks that destructors can't access
7479 destroyed values, [have been updated][dropck] to match the
7480 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7481 cause some previously-compiling code to no longer build.
7486 * The [new object lifetime defaults][nold] have been [turned
7487 on][nold2] after a cycle of warnings about the change.
7488 * Semicolons may [now follow types and paths in
7489 macros](https://github.com/rust-lang/rust/pull/27000).
7490 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7491 [more sane for dynamically sized types][dst3]. Code that relied on
7492 the previous behavior is not known to exist, and suspected to be
7494 * `'static` variables [may now be recursive][st].
7495 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7496 implementations correctly.
7497 * The `dropck` rules, which checks that destructors can't access
7498 destroyed values, [have been updated][dropck] to match the
7504 * The [`Duration`] API, [has been stabilized][ds], as well as the
7505 `std::time` module, which presently contains only `Duration`.
7506 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7507 * The owned C string, [`CString`], implements [`Borrow`] and the
7508 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7509 these allow C strings to be borrowed and cloned in generic code.
7510 * [`CStr`] implements [`Debug`].
7511 * [`AtomicPtr`] implements [`Debug`].
7512 * [`Error`] trait objects [can be downcast to their concrete types][e]
7513 in many common configurations, using the [`is`], [`downcast`],
7514 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7516 * Searching for substrings now [employs the two-way algorithm][search]
7517 instead of doing a naive search. This gives major speedups to a
7518 number of methods, including [`contains`][sc], [`find`][sf],
7519 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7520 [`ends_with`][sew] are also faster.
7521 * The performance of `PartialEq` for slices is [much faster][ps].
7522 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7523 is overridden and optimized by the implementations for scalars.
7524 * The [`Hasher`] trait now has a number of specialized `write_*`
7525 methods for primitive types, for efficiency.
7526 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7527 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7528 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7529 of [`std::error::Error::cause`][iec] also delegates to the inner
7531 * [`process::Child`][pc] gained the [`id`] method, which returns a
7532 `u32` representing the platform-specific process identifier.
7533 * The [`connect`] method on slices is deprecated, replaced by the new
7534 [`join`] method (note that both of these are on the *unstable*
7535 [`SliceConcatExt`] trait, but through the magic of the prelude are
7536 available to stable code anyway).
7537 * The [`Div`] operator is implemented for [`Wrapping`] types.
7538 * [`DerefMut` is implemented for `String`][dms].
7539 * Performance of SipHash (the default hasher for `HashMap`) is
7540 [better for long data][sh].
7541 * [`AtomicPtr`] implements [`Send`].
7542 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7543 are now [specialized to use uninitialized buffers for increased
7545 * Lifetime parameters of foreign functions [are now resolved
7551 * Rust can now, with some coercion, [produce programs that run on
7552 Windows XP][xp], though XP is not considered a supported platform.
7553 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7554 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7555 recommended for use in 1.3, though should be fully-functional
7556 in the [64-bit 1.4 beta][b14].
7557 * On Fedora-based systems installation will [properly configure the
7558 dynamic linker][fl].
7559 * The compiler gained many new extended error descriptions, which can
7560 be accessed with the `--explain` flag.
7561 * The `dropck` pass, which checks that destructors can't access
7562 destroyed values, [has been rewritten][dropck]. This fixes some
7563 soundness holes, and as such will cause some previously-compiling
7564 code to no longer build.
7565 * `rustc` now uses [LLVM to write archive files where possible][ar].
7566 Eventually this will eliminate the compiler's dependency on the ar
7568 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7569 supported FreeBSD on x86_64).
7570 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7571 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7573 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7574 will kill the process instead of leaking][nlp].
7576 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7577 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7578 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7579 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7580 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7581 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7582 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7583 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7584 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7585 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7586 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7587 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7588 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7589 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7590 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7591 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7592 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7593 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7594 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7595 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7596 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7597 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7598 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7599 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7600 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7601 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7602 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7603 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7604 [ar]: https://github.com/rust-lang/rust/pull/26926
7605 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7606 [dms]: https://github.com/rust-lang/rust/pull/26241
7607 [dropck]: https://github.com/rust-lang/rust/pull/27261
7608 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7609 [ds]: https://github.com/rust-lang/rust/pull/26818
7610 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7611 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7612 [dst3]: https://github.com/rust-lang/rust/pull/27351
7613 [e]: https://github.com/rust-lang/rust/pull/24793
7614 [f]: https://github.com/rust-lang/rust/pull/26588
7615 [fb]: https://github.com/rust-lang/rust/pull/26959
7616 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7617 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7618 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7619 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7620 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7621 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7622 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7623 [lic]: https://github.com/rust-lang/rust/pull/26583
7624 [lnu]: https://github.com/rust-lang/rust/pull/27026
7625 [lr]: https://github.com/rust-lang/rust/issues/27248
7626 [lum]: https://github.com/rust-lang/rust/pull/26378
7627 [lur]: https://github.com/rust-lang/rust/pull/26783
7628 [nlp]: https://github.com/rust-lang/rust/pull/27176
7629 [nold2]: https://github.com/rust-lang/rust/pull/27045
7630 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7631 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7632 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7633 [pi]: https://github.com/rust-lang/rust/pull/26699
7634 [ps]: https://github.com/rust-lang/rust/pull/26884
7635 [rte]: https://github.com/rust-lang/rust/pull/26950
7636 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7637 [search]: https://github.com/rust-lang/rust/pull/26327
7638 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7639 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7640 [sh]: https://github.com/rust-lang/rust/pull/27280
7641 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7642 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7643 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7644 [st]: https://github.com/rust-lang/rust/pull/26630
7645 [win1]: https://github.com/rust-lang/rust/pull/26569
7646 [win2]: https://github.com/rust-lang/rust/pull/26741
7647 [win3]: https://github.com/rust-lang/rust/pull/26741
7648 [win4]: https://github.com/rust-lang/rust/pull/27210
7649 [xp]: https://github.com/rust-lang/rust/pull/26569
7651 Version 1.2.0 (2015-08-07)
7652 ==========================
7654 * ~1200 changes, numerous bugfixes
7659 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7660 like `Rc` to contain types without a fixed size, arrays and trait
7661 objects, finally enabling use of `Rc<[T]>` and completing the
7662 implementation of DST.
7663 * [Parallel codegen][parcodegen] is now working again, which can
7664 substantially speed up large builds in debug mode; It also gets
7665 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7666 jobs). It's not enabled by default, but will be "in the near
7667 future". It can be activated with the `-C codegen-units=N` flag to
7669 * This is the first release with [experimental support for linking
7670 with the MSVC linker and lib C on Windows (instead of using the GNU
7671 variants via MinGW)][win]. It is yet recommended only for the most
7672 intrepid Rustaceans.
7673 * Benchmark compilations are showing a 30% improvement in
7674 bootstrapping over 1.1.
7679 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7680 unicode case mapping, which is a previously-planned change in
7681 behavior and considered a bugfix.
7682 * [`mem::align_of`] now specifies [the *minimum alignment* for
7683 T][align], which is usually the alignment programs are interested
7684 in, and the same value reported by clang's
7685 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7687 * [The `#[packed]` attribute is no longer silently accepted by the
7688 compiler][packed]. This attribute did nothing and code that
7689 mentioned it likely did not work as intended.
7690 * Associated type defaults are [now behind the
7691 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7692 defaults *did not work*, but could be mentioned syntactically. As
7693 such this breakage has minimal impact.
7698 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7699 matching against dereferenceable values.
7704 * The [`Extend`] trait, which grows a collection from an iterator, is
7705 implemented over iterators of references, for `String`, `Vec`,
7706 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7707 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7708 * The [`iter::once`] function returns an iterator that yields a single
7709 element, and [`iter::empty`] returns an iterator that yields no
7711 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7712 over substring matches.
7713 * [`Cell`] and [`RefCell`] both implement `Eq`.
7714 * A number of methods for wrapping arithmetic are added to the
7715 integral types, [`wrapping_div`], [`wrapping_rem`],
7716 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7717 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7718 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7719 type.. It is illegal for the default arithmetic operations in Rust
7720 to overflow; the desire to wrap must be explicit.
7721 * The `{:#?}` formatting specifier [displays the alternate,
7722 pretty-printed][debugfmt] form of the `Debug` formatter. This
7723 feature was actually introduced prior to 1.0 with little
7725 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7726 for writing data to formatted strings, similar to [`io::Write`].
7727 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7728 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7729 are used by code generators to emit implementations of [`Debug`].
7730 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7731 methods that convert case, following Unicode case mapping.
7732 * It is now easier to handle poisoned locks. The [`PoisonError`]
7733 type, returned by failing lock operations, exposes `into_inner`,
7734 `get_ref`, and `get_mut`, which all give access to the inner lock
7735 guard, and allow the poisoned lock to continue to operate. The
7736 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7737 poisoned lock without attempting to take the lock.
7738 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7739 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7740 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7741 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7743 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7749 * `rustc` employs smarter heuristics for guessing at [typos].
7750 * `rustc` emits more efficient code for [no-op conversions between
7751 unsafe pointers][nop].
7752 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7753 resulting in faster compile times and smaller code.
7755 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7756 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7757 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7758 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7759 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7760 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7761 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7762 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7763 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7764 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7765 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7766 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7767 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7768 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7769 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7770 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7771 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7772 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7773 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7774 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7775 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7776 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7777 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7778 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7779 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7780 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7781 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7782 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7783 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7784 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7785 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7786 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7787 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7788 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7789 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7790 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7791 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7792 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7793 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7794 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7795 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7796 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7797 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7798 [align]: https://github.com/rust-lang/rust/pull/25646
7799 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7800 [typos]: https://github.com/rust-lang/rust/pull/26087
7801 [nop]: https://github.com/rust-lang/rust/pull/26336
7802 [fat]: https://github.com/rust-lang/rust/pull/26411
7803 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7804 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7805 [packed]: https://github.com/rust-lang/rust/pull/25541
7806 [ad]: https://github.com/rust-lang/rust/pull/27382
7807 [win]: https://github.com/rust-lang/rust/pull/25350
7809 Version 1.1.0 (2015-06-25)
7810 =========================
7812 * ~850 changes, numerous bugfixes
7817 * The [`std::fs` module has been expanded][fs] to expand the set of
7818 functionality exposed:
7819 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7820 don't incur a syscall on some platforms.
7821 * A `symlink_metadata` function has been added.
7822 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7823 access to all underlying information.
7824 * The compiler now contains extended explanations of many errors. When an error
7825 with an explanation occurs the compiler suggests using the `--explain` flag
7826 to read the explanation. Error explanations are also [available online][err-index].
7827 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7828 well as other work, the time to bootstrap the compiler decreased by
7834 * The [`str::split_whitespace`] method splits a string on unicode
7835 whitespace boundaries.
7836 * On both Windows and Unix, new extension traits provide conversion of
7837 I/O types to and from the underlying system handles. On Unix, these
7838 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7839 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7840 `TcpListener`, and `UpdSocket`. Further implementations for
7841 `std::process` will be stabilized later.
7842 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7843 Windows, symlinks can be created with
7844 `std::os::windows::symlink_dir` and
7845 `std::os::windows::symlink_file`.
7846 * The `mpsc::Receiver` type can now be converted into an iterator with
7847 `into_iter` on the [`IntoIterator`] trait.
7848 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7849 implementation of the [`From`] trait.
7850 * The `Debug` implementation for `RangeFull` [creates output that is
7851 more consistent with other implementations][rf].
7852 * [`Debug` is implemented for `File`][file].
7853 * The `Default` implementation for `Arc` [no longer requires `Sync +
7855 * [The `Iterator` methods `count`, `nth`, and `last` have been
7856 overridden for slices to have O(1) performance instead of O(n)][si].
7857 * Incorrect handling of paths on Windows has been improved in both the
7858 compiler and the standard library.
7859 * [`AtomicPtr` gained a `Default` implementation][ap].
7860 * In accordance with Rust's policy on arithmetic overflow `abs` now
7861 [panics on overflow when debug assertions are enabled][abs].
7862 * The [`Cloned`] iterator, which was accidentally left unstable for
7863 1.0 [has been stabilized][c].
7864 * The [`Incoming`] iterator, which iterates over incoming TCP
7865 connections, and which was accidentally unnamable in 1.0, [is now
7866 properly exported][inc].
7867 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7868 `sift_up` or `sift_down` panic][bh].
7869 * The [`split_off`] method of `LinkedList` [no longer corrupts
7870 the list in certain scenarios][ll].
7875 * Type checking performance [has improved notably][sk] with
7876 [multiple improvements][pre].
7877 * The compiler [suggests code changes][ch] for more errors.
7878 * rustc and it's build system have experimental support for [building
7879 toolchains against MUSL][m] instead of glibc on Linux.
7880 * The compiler defines the `target_env` cfg value, which is used for
7881 distinguishing toolchains that are otherwise for the same
7882 platform. Presently this is set to `gnu` for common GNU Linux
7883 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7884 * The [`cargo rustc`][crc] command invokes a build with custom flags
7886 * [Android executables are always position independent][pie].
7887 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7890 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7891 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7892 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7893 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7894 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7895 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7896 [rf]: https://github.com/rust-lang/rust/pull/24491
7897 [err-index]: https://doc.rust-lang.org/error-index.html
7898 [sk]: https://github.com/rust-lang/rust/pull/24615
7899 [pre]: https://github.com/rust-lang/rust/pull/25323
7900 [file]: https://github.com/rust-lang/rust/pull/24598
7901 [ch]: https://github.com/rust-lang/rust/pull/24683
7902 [arc]: https://github.com/rust-lang/rust/pull/24695
7903 [si]: https://github.com/rust-lang/rust/pull/24701
7904 [ap]: https://github.com/rust-lang/rust/pull/24834
7905 [m]: https://github.com/rust-lang/rust/pull/24777
7906 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7907 [crc]: https://github.com/rust-lang/cargo/pull/1568
7908 [pie]: https://github.com/rust-lang/rust/pull/24953
7909 [abs]: https://github.com/rust-lang/rust/pull/25441
7910 [c]: https://github.com/rust-lang/rust/pull/25496
7911 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7912 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7913 [inc]: https://github.com/rust-lang/rust/pull/25522
7914 [bh]: https://github.com/rust-lang/rust/pull/25856
7915 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7916 [ll]: https://github.com/rust-lang/rust/pull/26022
7917 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7918 [drop]: https://github.com/rust-lang/rust/pull/24935
7920 Version 1.0.0 (2015-05-15)
7921 ========================
7923 * ~1500 changes, numerous bugfixes
7928 * The vast majority of the standard library is now `#[stable]`. It is
7929 no longer possible to use unstable features with a stable build of
7931 * Many popular crates on [crates.io] now work on the stable release
7933 * Arithmetic on basic integer types now [checks for overflow in debug
7939 * Several [restrictions have been added to trait coherence][coh] in
7940 order to make it easier for upstream authors to change traits
7941 without breaking downstream code.
7942 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7943 improve error messages and macro behavior. For example, `0b1234` is
7944 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7945 * Trait bounds [are always invariant][inv], eliminating the need for
7946 the `PhantomFn` and `MarkerTrait` lang items, which have been
7948 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7949 "foo" as bar` syntax has been replaced with `extern crate foo as
7950 bar`, and Cargo now automatically translates "-" in *package* names
7951 to underscore for the crate name.
7952 * [Lifetime shadowing is an error][lt].
7953 * [`Send` no longer implies `'static`][send-rfc].
7954 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7955 `MyType::default()`.
7956 * Primitive types [now have inherent methods][prim-inherent],
7957 obviating the need for extension traits like `SliceExt`.
7958 * Methods with `Self: Sized` in their `where` clause are [considered
7959 object-safe][self-sized], allowing many extension traits like
7960 `IteratorExt` to be merged into the traits they extended.
7961 * You can now [refer to associated types][assoc-where] whose
7962 corresponding trait bounds appear only in a `where` clause.
7963 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7964 like `Send` and `Sync` are now library-defined.
7965 * A [Reflect trait][reflect] was introduced, which means that
7966 downcasting via the `Any` trait is effectively limited to concrete
7967 types. This helps retain the potentially-important "parametricity"
7968 property: generic code cannot behave differently for different type
7969 arguments except in minor ways.
7970 * The `unsafe_destructor` feature is now deprecated in favor of the
7971 [new `dropck`][dropck]. This change is a major reduction in unsafe
7977 * The `thread_local` module [has been renamed to `std::thread`][th].
7978 * The methods of `IteratorExt` [have been moved to the `Iterator`
7980 * Several traits that implement Rust's conventions for type
7981 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7982 [centralized in the `std::convert` module][con].
7983 * The `FromError` trait [was removed in favor of `From`][fe].
7984 * The basic sleep function [has moved to
7985 `std::thread::sleep_ms`][slp].
7986 * The `splitn` function now takes an `n` parameter that represents the
7987 number of items yielded by the returned iterator [instead of the
7988 number of 'splits'][spl].
7989 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7990 * [Derived implementations of `PartialOrd` now order enums according
7991 to their explicitly-assigned discriminants][po].
7992 * [Methods for searching strings are generic over `Pattern`s][pat],
7993 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7995 * [In method resolution, object methods are resolved before inherent
7997 * [`String::from_str` has been deprecated in favor of the `From` impl,
7998 `String::from`][sf].
7999 * [`io::Error` implements `Sync`][ios].
8000 * [The `words` method on `&str` has been replaced with
8001 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8003 * The new path and IO modules are complete and `#[stable]`. This
8004 was the major library focus for this cycle.
8005 * The path API was [revised][path-normalize] to normalize `.`,
8006 adjusting the tradeoffs in favor of the most common usage.
8007 * A large number of remaining APIs in `std` were also stabilized
8008 during this cycle; about 75% of the non-deprecated API surface
8010 * The new [string pattern API][string-pattern] landed, which makes
8011 the string slice API much more internally consistent and flexible.
8012 * A new set of [generic conversion traits][conversion] replaced
8013 many existing ad hoc traits.
8014 * Generic numeric traits were [completely removed][num-traits]. This
8015 was made possible thanks to inherent methods for primitive types,
8016 and the removal gives maximal flexibility for designing a numeric
8017 hierarchy in the future.
8018 * The `Fn` traits are now related via [inheritance][fn-inherit]
8019 and provide ergonomic [blanket implementations][fn-blanket].
8020 * The `Index` and `IndexMut` traits were changed to
8021 [take the index by value][index-value], enabling code like
8022 `hash_map["string"]` to work.
8023 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8024 `Copy` data is known to be `Clone` as well.
8029 * Many errors now have extended explanations that can be accessed with
8030 the `--explain` flag to `rustc`.
8031 * Many new examples have been added to the standard library
8033 * rustdoc has received a number of improvements focused on completion
8035 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8036 * Much headway was made on ecosystem-wide CI, making it possible
8037 to [compare builds for breakage][ci-compare].
8040 [crates.io]: http://crates.io
8041 [clo]: https://github.com/rust-lang/rust/pull/24034
8042 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8043 [con]: https://github.com/rust-lang/rust/pull/23875
8044 [cr]: https://github.com/rust-lang/rust/pull/23419
8045 [fe]: https://github.com/rust-lang/rust/pull/23879
8046 [ie]: https://github.com/rust-lang/rust/pull/23300
8047 [inv]: https://github.com/rust-lang/rust/pull/23938
8048 [ios]: https://github.com/rust-lang/rust/pull/24133
8049 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8050 [lt]: https://github.com/rust-lang/rust/pull/24057
8051 [meth]: https://github.com/rust-lang/rust/pull/24056
8052 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8053 [po]: https://github.com/rust-lang/rust/pull/24270
8054 [sf]: https://github.com/rust-lang/rust/pull/24517
8055 [slp]: https://github.com/rust-lang/rust/pull/23949
8056 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8057 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8058 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8059 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8060 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8061 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8062 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8063 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8064 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8065 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8066 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8067 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8068 [reflect]: https://github.com/rust-lang/rust/pull/23712
8069 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8070 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8071 [index-value]: https://github.com/rust-lang/rust/pull/23601
8072 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8073 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8074 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8075 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8076 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8077 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8080 Version 1.0.0-alpha.2 (2015-02-20)
8081 =====================================
8083 * ~1300 changes, numerous bugfixes
8087 * The various I/O modules were [overhauled][io-rfc] to reduce
8088 unnecessary abstractions and provide better interoperation with
8089 the underlying platform. The old `io` module remains temporarily
8091 * The standard library now [participates in feature gating][feat],
8092 so use of unstable libraries now requires a `#![feature(...)]`
8093 attribute. The impact of this change is [described on the
8094 forum][feat-forum]. [RFC][feat-rfc].
8098 * `for` loops [now operate on the `IntoIterator` trait][into],
8099 which eliminates the need to call `.iter()`, etc. to iterate
8100 over collections. There are some new subtleties to remember
8101 though regarding what sort of iterators various types yield, in
8102 particular that `for foo in bar { }` yields values from a move
8103 iterator, destroying the original collection. [RFC][into-rfc].
8104 * Objects now have [default lifetime bounds][obj], so you don't
8105 have to write `Box<Trait+'static>` when you don't care about
8106 storing references. [RFC][obj-rfc].
8107 * In types that implement `Drop`, [lifetimes must outlive the
8108 value][drop]. This will soon make it possible to safely
8109 implement `Drop` for types where `#[unsafe_destructor]` is now
8110 required. Read the [gorgeous RFC][drop-rfc] for details.
8111 * The fully qualified <T as Trait>::X syntax lets you set the Self
8112 type for a trait method or associated type. [RFC][ufcs-rfc].
8113 * References to types that implement `Deref<U>` now [automatically
8114 coerce to references][deref] to the dereferenced type `U`,
8115 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8116 should eliminate many unsightly uses of `&*`, as when converting
8117 from references to vectors into references to
8118 slices. [RFC][deref-rfc].
8119 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8120 `|:|`) is obsolete and closure kind is inferred from context.
8121 * [`Self` is a keyword][Self].
8125 * The `Show` and `String` formatting traits [have been
8126 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8127 their related purposes. Automatically getting a string
8128 conversion to use with `format!("{:?}", something_to_debug)` is
8129 now written `#[derive(Debug)]`.
8130 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8131 OsStr}`, provide strings in platform-specific encodings for easier
8132 interop with system APIs. [RFC][osstr-rfc].
8133 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8134 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8135 creating raw pointers.
8139 * Certain long error messages of the form 'expected foo found bar'
8140 are now [split neatly across multiple
8141 lines][multiline]. Examples in the PR.
8142 * On Unix Rust can be [uninstalled][un] by running
8143 `/usr/local/lib/rustlib/uninstall.sh`.
8144 * The `#[rustc_on_unimplemented]` attribute, requiring the
8145 'on_unimplemented' feature, lets rustc [display custom error
8146 messages when a trait is expected to be implemented for a type
8151 * Rust is tested against a [LALR grammar][lalr], which parses
8152 almost all the Rust files that rustc does.
8154 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8155 [close]: https://github.com/rust-lang/rust/pull/21843
8156 [deref]: https://github.com/rust-lang/rust/pull/21351
8157 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8158 [drop]: https://github.com/rust-lang/rust/pull/21972
8159 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8160 [feat]: https://github.com/rust-lang/rust/pull/21248
8161 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8162 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8163 [fmt]: https://github.com/rust-lang/rust/pull/21457
8164 [into]: https://github.com/rust-lang/rust/pull/20790
8165 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8166 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8167 [lalr]: https://github.com/rust-lang/rust/pull/21452
8168 [multiline]: https://github.com/rust-lang/rust/pull/19870
8169 [obj]: https://github.com/rust-lang/rust/pull/22230
8170 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8171 [onun]: https://github.com/rust-lang/rust/pull/20889
8172 [osstr]: https://github.com/rust-lang/rust/pull/21488
8173 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8174 [Self]: https://github.com/rust-lang/rust/pull/22158
8175 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8176 [un]: https://github.com/rust-lang/rust/pull/22256
8179 Version 1.0.0-alpha (2015-01-09)
8180 ==================================
8182 * ~2400 changes, numerous bugfixes
8186 * The language itself is considered feature complete for 1.0,
8187 though there will be many usability improvements and bugfixes
8188 before the final release.
8189 * Nearly 50% of the public API surface of the standard library has
8190 been declared 'stable'. Those interfaces are unlikely to change
8192 * The long-running debate over integer types has been
8193 [settled][ints]: Rust will ship with types named `isize` and
8194 `usize`, rather than `int` and `uint`, for pointer-sized
8195 integers. Guidelines will be rolled out during the alpha cycle.
8196 * Most crates that are not `std` have been moved out of the Rust
8197 distribution into the Cargo ecosystem so they can evolve
8198 separately and don't need to be stabilized as quickly, including
8199 'time', 'getopts', 'num', 'regex', and 'term'.
8200 * Documentation continues to be expanded with more API coverage, more
8201 examples, and more in-depth explanations. The guides have been
8202 consolidated into [The Rust Programming Language][trpl].
8203 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8204 * All official Rust binary installers now come with [Cargo], the
8205 Rust package manager.
8209 * Closures have been [completely redesigned][unboxed] to be
8210 implemented in terms of traits, can now be used as generic type
8211 bounds and thus monomorphized and inlined, or via an opaque
8212 pointer (boxed) as in the old system. The new system is often
8213 referred to as 'unboxed' closures.
8214 * Traits now support [associated types][assoc], allowing families
8215 of related types to be defined together and used generically in
8217 * Enum variants are [namespaced by their type names][enum].
8218 * [`where` clauses][where] provide a more versatile and attractive
8219 syntax for specifying generic bounds, though the previous syntax
8221 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8223 * Rust [no longer has a runtime][rt] of any description, and only
8224 supports OS threads, not green threads.
8225 * At long last, Rust has been overhauled for 'dynamically-sized
8226 types' ([DST]), which integrates 'fat pointers' (object types,
8227 arrays, and `str`) more deeply into the type system, making it
8229 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8230 `..j` that produce range types and which, when combined with the
8231 `Index` operator and multidispatch, leads to a convenient slice
8233 * The new range syntax revealed an ambiguity in the fixed-length
8234 array syntax, so now fixed length arrays [are written `[T;
8236 * The `Copy` trait is no longer implemented automatically. Unsafe
8237 pointers no longer implement `Sync` and `Send` so types
8238 containing them don't automatically either. `Sync` and `Send`
8239 are now 'unsafe traits' so one can "forcibly" implement them via
8240 `unsafe impl` if a type confirms to the requirements for them
8241 even though the internals do not (e.g. structs containing unsafe
8242 pointers like `Arc`). These changes are intended to prevent some
8243 footguns and are collectively known as [opt-in built-in
8244 traits][oibit] (though `Sync` and `Send` will soon become pure
8245 library types unknown to the compiler).
8246 * Operator traits now take their operands [by value][ops], and
8247 comparison traits can use multidispatch to compare one type
8248 against multiple other types, allowing e.g. `String` to be
8249 compared with `&str`.
8250 * `if let` and `while let` are no longer feature-gated.
8251 * Rust has adopted a more [uniform syntax for escaping unicode
8252 characters][unicode].
8253 * `macro_rules!` [has been declared stable][mac]. Though it is a
8254 flawed system it is sufficiently popular that it must be usable
8255 for 1.0. Effort has gone into [future-proofing][mac-future] it
8256 in ways that will allow other macro systems to be developed in
8257 parallel, and won't otherwise impact the evolution of the
8259 * The prelude has been [pared back significantly][prelude] such
8260 that it is the minimum necessary to support the most pervasive
8261 code patterns, and through [generalized where clauses][where]
8262 many of the prelude extension traits have been consolidated.
8263 * Rust's rudimentary reflection [has been removed][refl], as it
8264 incurred too much code generation for little benefit.
8265 * [Struct variants][structvars] are no longer feature-gated.
8266 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8267 known as 'higher-ranked trait bounds', this crucially allows
8268 unboxed closures to work.
8269 * Macros invocations surrounded by parens or square brackets and
8270 not terminated by a semicolon are [parsed as
8271 expressions][macros], which makes expressions like `vec![1i32,
8272 2, 3].len()` work as expected.
8273 * Trait objects now implement their traits automatically, and
8274 traits that can be coerced to objects now must be [object
8276 * Automatically deriving traits is now done with `#[derive(...)]`
8277 not `#[deriving(...)]` for [consistency with other naming
8278 conventions][derive].
8279 * Importing the containing module or enum at the same time as
8280 items or variants they contain is [now done with `self` instead
8281 of `mod`][self], as in use `foo::{self, bar}`
8282 * Glob imports are no longer feature-gated.
8283 * The `box` operator and `box` patterns have been feature-gated
8284 pending a redesign. For now unique boxes should be allocated
8285 like other containers, with `Box::new`.
8289 * A [series][coll1] of [efforts][coll2] to establish
8290 [conventions][coll3] for collections types has resulted in API
8291 improvements throughout the standard library.
8292 * New [APIs for error handling][err] provide ergonomic interop
8293 between error types, and [new conventions][err-conv] describe
8294 more clearly the recommended error handling strategies in Rust.
8295 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8296 it is easier to discuss failure in the context of error handling
8297 without making clarifications as to whether you are referring to
8298 the 'fail' macro or failure more generally.
8299 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8300 syscall when available.
8301 * The 'serialize' crate has been renamed 'rustc-serialize' and
8302 moved out of the distribution to Cargo. Although it is widely
8303 used now, it is expected to be superseded in the near future.
8304 * The `Show` formatter, typically implemented with
8305 `#[derive(Show)]` is [now requested with the `{:?}`
8306 specifier][show] and is intended for use by all types, for uses
8307 such as `println!` debugging. The new `String` formatter must be
8308 implemented by hand, uses the `{}` specifier, and is intended
8309 for full-fidelity conversions of things that can logically be
8310 represented as strings.
8314 * [Flexible target specification][flex] allows rustc's code
8315 generation to be configured to support otherwise-unsupported
8317 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8318 respective debuggers with Rust-appropriate pretty-printing.
8319 * The Windows installation of Rust is distributed with the
8320 MinGW components currently required to link binaries on that
8325 * Nullable enum optimizations have been extended to more types so
8326 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8327 space than the inner types themselves.
8328 * Work has begun on supporting AArch64.
8330 [Cargo]: https://crates.io
8331 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8332 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8333 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8334 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8335 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8336 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8337 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8338 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8339 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8340 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8341 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8342 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8343 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8344 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8345 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8346 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8347 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8348 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8349 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8350 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8351 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8352 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8353 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8354 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8355 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8356 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8357 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8358 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8359 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8360 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8361 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8362 [trpl]: https://doc.rust-lang.org/book/index.html
8363 [rbe]: http://rustbyexample.com/
8366 Version 0.12.0 (2014-10-09)
8367 =============================
8369 * ~1900 changes, numerous bugfixes
8373 * The introductory documentation (now called The Rust Guide) has
8374 been completely rewritten, as have a number of supplementary
8376 * Rust's package manager, Cargo, continues to improve and is
8377 sometimes considered to be quite awesome.
8378 * Many API's in `std` have been reviewed and updated for
8379 consistency with the in-development Rust coding
8380 guidelines. The standard library documentation tracks
8381 stabilization progress.
8382 * Minor libraries have been moved out-of-tree to the rust-lang org
8383 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8384 be installed with Cargo.
8385 * Lifetime elision allows lifetime annotations to be left off of
8386 function declarations in many common scenarios.
8387 * Rust now works on 64-bit Windows.
8390 * Indexing can be overloaded with the `Index` and `IndexMut`
8392 * The `if let` construct takes a branch only if the `let` pattern
8393 matches, currently behind the 'if_let' feature gate.
8394 * 'where clauses', a more flexible syntax for specifying trait
8395 bounds that is more aesthetic, have been added for traits and
8396 free functions. Where clauses will in the future make it
8397 possible to constrain associated types, which would be
8398 impossible with the existing syntax.
8399 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8400 the 'slicing_syntax' feature gate, and can be overloaded with
8401 the `Slice` or `SliceMut` traits.
8402 * The syntax for matching of sub-slices has been changed to use a
8403 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8404 consistency with other uses of `..` and to future-proof
8405 potential additional uses of the syntax.
8406 * The syntax for matching inclusive ranges in patterns has changed
8407 from `0..3` to `0...4` to be consistent with the exclusive range
8409 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8410 c]`) has been put behind the 'advanced_slice_patterns' feature
8411 gate and may be removed in the future.
8412 * Components of tuples and tuple structs can be extracted using
8413 the `value.0` syntax, currently behind the `tuple_indexing`
8415 * The `#[crate_id]` attribute is no longer supported; versioning
8416 is handled by the package manager.
8417 * Renaming crate imports are now written `extern crate foo as bar`
8418 instead of `extern crate bar = foo`.
8419 * Renaming use statements are now written `use foo as bar` instead
8421 * `let` and `match` bindings and argument names in macros are now
8423 * The new, more efficient, closure types ('unboxed closures') have
8424 been added under a feature gate, 'unboxed_closures'. These will
8425 soon replace the existing closure types, once higher-ranked
8426 trait lifetimes are added to the language.
8427 * `move` has been added as a keyword, for indicating closures
8428 that capture by value.
8429 * Mutation and assignment is no longer allowed in pattern guards.
8430 * Generic structs and enums can now have trait bounds.
8431 * The `Share` trait is now called `Sync` to free up the term
8432 'shared' to refer to 'shared reference' (the default reference
8434 * Dynamically-sized types have been mostly implemented,
8435 unifying the behavior of fat-pointer types with the rest of the
8437 * As part of dynamically-sized types, the `Sized` trait has been
8438 introduced, which qualifying types implement by default, and
8439 which type parameters expect by default. To specify that a type
8440 parameter does not need to be sized, write `<Sized? T>`. Most
8441 types are `Sized`, notable exceptions being unsized arrays
8442 (`[T]`) and trait types.
8443 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8444 * Lifetime bounds can now be applied to type parameters and object
8446 * The old, reference counted GC type, `Gc<T>` which was once
8447 denoted by the `@` sigil, has finally been removed. GC will be
8448 revisited in the future.
8451 * Library documentation has been improved for a number of modules.
8452 * Bit-vectors, collections::bitv has been modernized.
8453 * The url crate is deprecated in favor of
8454 http://github.com/servo/rust-url, which can be installed with
8456 * Most I/O stream types can be cloned and subsequently closed from
8458 * A `std::time::Duration` type has been added for use in I/O
8459 methods that rely on timers, as well as in the 'time' crate's
8460 `Timespec` arithmetic.
8461 * The runtime I/O abstraction layer that enabled the green thread
8462 scheduler to do non-thread-blocking I/O has been removed, along
8463 with the libuv-based implementation employed by the green thread
8464 scheduler. This will greatly simplify the future I/O work.
8465 * `collections::btree` has been rewritten to have a more
8466 idiomatic and efficient design.
8469 * rustdoc output now indicates the stability levels of API's.
8470 * The `--crate-name` flag can specify the name of the crate
8471 being compiled, like `#[crate_name]`.
8472 * The `-C metadata` specifies additional metadata to hash into
8473 symbol names, and `-C extra-filename` specifies additional
8474 information to put into the output filename, for use by the
8475 package manager for versioning.
8476 * debug info generation has continued to improve and should be
8477 more reliable under both gdb and lldb.
8478 * rustc has experimental support for compiling in parallel
8479 using the `-C codegen-units` flag.
8480 * rustc no longer encodes rpath information into binaries by
8484 * Stack usage has been optimized with LLVM lifetime annotations.
8485 * Official Rust binaries on Linux are more compatible with older
8486 kernels and distributions, built on CentOS 5.10.
8489 Version 0.11.0 (2014-07-02)
8490 ==========================
8492 * ~1700 changes, numerous bugfixes
8495 * ~[T] has been removed from the language. This type is superseded by
8497 * ~str has been removed from the language. This type is superseded by
8499 * ~T has been removed from the language. This type is superseded by the
8501 * @T has been removed from the language. This type is superseded by the
8502 standard library's std::gc::Gc<T> type.
8503 * Struct fields are now all private by default.
8504 * Vector indices and shift amounts are both required to be a `uint`
8505 instead of any integral type.
8506 * Byte character, byte string, and raw byte string literals are now all
8507 supported by prefixing the normal literal with a `b`.
8508 * Multiple ABIs are no longer allowed in an ABI string
8509 * The syntax for lifetimes on closures/procedures has been tweaked
8510 slightly: `<'a>|A, B|: 'b + K -> T`
8511 * Floating point modulus has been removed from the language; however it
8512 is still provided by a library implementation.
8513 * Private enum variants are now disallowed.
8514 * The `priv` keyword has been removed from the language.
8515 * A closure can no longer be invoked through a &-pointer.
8516 * The `use foo, bar, baz;` syntax has been removed from the language.
8517 * The transmute intrinsic no longer works on type parameters.
8518 * Statics now allow blocks/items in their definition.
8519 * Trait bounds are separated from objects with + instead of : now.
8520 * Objects can no longer be read while they are mutably borrowed.
8521 * The address of a static is now marked as insignificant unless the
8522 #[inline(never)] attribute is placed it.
8523 * The #[unsafe_destructor] attribute is now behind a feature gate.
8524 * Struct literals are no longer allowed in ambiguous positions such as
8525 if, while, match, and for..in.
8526 * Declaration of lang items and intrinsics are now feature-gated by
8528 * Integral literals no longer default to `int`, and floating point
8529 literals no longer default to `f64`. Literals must be suffixed with an
8530 appropriate type if inference cannot determine the type of the
8532 * The Box<T> type is no longer implicitly borrowed to &mut T.
8533 * Procedures are now required to not capture borrowed references.
8536 * The standard library is now a "facade" over a number of underlying
8537 libraries. This means that development on the standard library should
8538 be speedier due to smaller crates, as well as a clearer line between
8540 * A new library, libcore, lives under the standard library's facade
8541 which is Rust's "0-assumption" library, suitable for embedded and
8542 kernel development for example.
8543 * A regex crate has been added to the standard distribution. This crate
8544 includes statically compiled regular expressions.
8545 * The unwrap/unwrap_err methods on Result require a Show bound for
8546 better error messages.
8547 * The return types of the std::comm primitives have been centralized
8548 around the Result type.
8549 * A number of I/O primitives have gained the ability to time out their
8551 * A number of I/O primitives have gained the ability to close their
8552 reading/writing halves to cancel pending operations.
8553 * Reverse iterator methods have been removed in favor of `rev()` on
8554 their forward-iteration counterparts.
8555 * A bitflags! macro has been added to enable easy interop with C and
8556 management of bit flags.
8557 * A debug_assert! macro is now provided which is disabled when
8558 `--cfg ndebug` is passed to the compiler.
8559 * A graphviz crate has been added for creating .dot files.
8560 * The std::cast module has been migrated into std::mem.
8561 * The std::local_data api has been migrated from freestanding functions
8562 to being based on methods.
8563 * The Pod trait has been renamed to Copy.
8564 * jemalloc has been added as the default allocator for types.
8565 * The API for allocating memory has been changed to use proper alignment
8566 and sized deallocation
8567 * Connecting a TcpStream or binding a TcpListener is now based on a
8568 string address and a u16 port. This allows connecting to a hostname as
8570 * The Reader trait now contains a core method, read_at_least(), which
8571 correctly handles many repeated 0-length reads.
8572 * The process-spawning API is now centered around a builder-style
8574 * The :? printing qualifier has been moved from the standard library to
8575 an external libdebug crate.
8576 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8577 have been renamed to Eq/Ord.
8578 * The select/plural methods have been removed from format!. The escapes
8579 for { and } have also changed from \{ and \} to {{ and }},
8581 * The TaskBuilder API has been re-worked to be a true builder, and
8582 extension traits for spawning native/green tasks have been added.
8585 * All breaking changes to the language or libraries now have their
8586 commit message annotated with `[breaking-change]` to allow for easy
8587 discovery of breaking changes.
8588 * The compiler will now try to suggest how to annotate lifetimes if a
8589 lifetime-related error occurs.
8590 * Debug info continues to be improved greatly with general bug fixes and
8591 better support for situations like link time optimization (LTO).
8592 * Usage of syntax extensions when cross-compiling has been fixed.
8593 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8594 -fdata-sections and --gc-sections has been enabled by default
8595 * The compiler is now stricter about where it will load module files
8596 from when a module is declared via `mod foo;`.
8597 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8598 Syntax extensions are now discovered via a "plugin registrar" type
8599 which will be extended in the future to other various plugins.
8600 * Lints have been restructured to allow for dynamically loadable lints.
8601 * A number of rustdoc improvements:
8602 * The HTML output has been visually redesigned.
8603 * Markdown is now powered by hoedown instead of sundown.
8604 * Searching heuristics have been greatly improved.
8605 * The search index has been reduced in size by a great amount.
8606 * Cross-crate documentation via `pub use` has been greatly improved.
8607 * Primitive types are now hyperlinked and documented.
8608 * Documentation has been moved from static.rust-lang.org/doc to
8610 * A new sandbox, play.rust-lang.org, is available for running and
8611 sharing rust code examples on-line.
8612 * Unused attributes are now more robustly warned about.
8613 * The dead_code lint now warns about unused struct fields.
8614 * Cross-compiling to iOS is now supported.
8615 * Cross-compiling to mipsel is now supported.
8616 * Stability attributes are now inherited by default and no longer apply
8617 to intra-crate usage, only inter-crate usage.
8618 * Error message related to non-exhaustive match expressions have been
8622 Version 0.10 (2014-04-03)
8623 =========================
8625 * ~1500 changes, numerous bugfixes
8628 * A new RFC process is now in place for modifying the language.
8629 * Patterns with `@`-pointers have been removed from the language.
8630 * Patterns with unique vectors (`~[T]`) have been removed from the
8632 * Patterns with unique strings (`~str`) have been removed from the
8634 * `@str` has been removed from the language.
8635 * `@[T]` has been removed from the language.
8636 * `@self` has been removed from the language.
8637 * `@Trait` has been removed from the language.
8638 * Headers on `~` allocations which contain `@` boxes inside the type for
8639 reference counting have been removed.
8640 * The semantics around the lifetimes of temporary expressions have changed,
8641 see #3511 and #11585 for more information.
8642 * Cross-crate syntax extensions are now possible, but feature gated. See
8643 #11151 for more information. This includes both `macro_rules!` macros as
8644 well as syntax extensions such as `format!`.
8645 * New lint modes have been added, and older ones have been turned on to be
8647 * Unnecessary parentheses
8650 * Uppercase variables
8651 * Publicly visible private types
8652 * `#[deriving]` with raw pointers
8653 * Unsafe functions can no longer be coerced to closures.
8654 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8655 * The `#[simd]` attribute is now behind a feature gate.
8656 * Visibility is no longer allowed on `extern crate` statements, and
8657 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8658 * Trailing commas are now allowed in argument lists and tuple patterns.
8659 * The `do` keyword has been removed, it is now a reserved keyword.
8660 * Default type parameters have been implemented, but are feature gated.
8661 * Borrowed variables through captures in closures are now considered soundly.
8662 * `extern mod` is now `extern crate`
8663 * The `Freeze` trait has been removed.
8664 * The `Share` trait has been added for types that can be shared among
8666 * Labels in macros are now hygienic.
8667 * Expression/statement macro invocations can be delimited with `{}` now.
8668 * Treatment of types allowed in `static mut` locations has been tweaked.
8669 * The `*` and `.` operators are now overloadable through the `Deref` and
8671 * `~Trait` and `proc` no longer have `Send` bounds by default.
8672 * Partial type hints are now supported with the `_` type marker.
8673 * An `Unsafe` type was introduced for interior mutability. It is now
8674 considered undefined to transmute from `&T` to `&mut T` without using the
8676 * The #[linkage] attribute was implemented for extern statics/functions.
8677 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8678 * `Pod` was renamed to `Copy`.
8681 * The `libextra` library has been removed. It has now been decomposed into
8682 component libraries with smaller and more focused nuggets of
8683 functionality. The full list of libraries can be found on the
8684 documentation index page.
8685 * std: `std::condition` has been removed. All I/O errors are now propagated
8686 through the `Result` type. In order to assist with error handling, a
8687 `try!` macro for unwrapping errors with an early return and a lint for
8688 unused results has been added. See #12039 for more information.
8689 * std: The `vec` module has been renamed to `slice`.
8690 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8691 This will become the only growable vector in the future.
8692 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8693 are now found at `std::io::BufferedReader` instead of
8694 `std::io::buffered::BufferedReader`.
8695 * std: `print` and `println` are no longer in the prelude, the `print!` and
8696 `println!` macros are intended to be used instead.
8697 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8698 attempts to statically prevent cycles.
8699 * std: The standard distribution is adopting the policy of pushing failure
8700 to the user rather than failing in libraries. Many functions (such as
8701 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8702 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8703 deriving mode: `#[deriving(Show)]`.
8704 * std: `ToStr` is now implemented for all types implementing `Show`.
8705 * std: The formatting trait methods now take `&self` instead of `&T`
8706 * std: The `invert()` method on iterators has been renamed to `rev()`
8707 * std: `std::num` has seen a reduction in the genericity of its traits,
8708 consolidating functionality into a few core traits.
8709 * std: Backtraces are now printed on task failure if the environment
8710 variable `RUST_BACKTRACE` is present.
8711 * std: Naming conventions for iterators have been standardized. More details
8712 can be found on the wiki's style guide.
8713 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8714 still implement the function.
8715 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8716 * std: `assert_approx_eq!` has been removed
8717 * std: The `e` and `E` formatting specifiers for floats have been added to
8718 print them in exponential notation.
8719 * std: The `Times` trait has been removed
8720 * std: Indications of variance and opting out of builtin bounds is done
8721 through marker types in `std::kinds::marker` now
8722 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8723 `#[deriving(Hash)]` is now possible.
8724 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8725 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8726 * std: `Chan::new` is now `channel()`.
8727 * std: A new synchronous channel type has been implemented.
8728 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8729 * std: `hashmap` and `trie` have been moved to `libcollections`
8730 * std: `run` has been rolled into `io::process`
8731 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8732 * std: The equality and comparison traits have seen some reorganization.
8733 * std: `rand` has moved to `librand`.
8734 * std: `to_{lower,upper}case` has been implemented for `char`.
8735 * std: Logging has been moved to `liblog`.
8736 * collections: `HashMap` has been rewritten for higher performance and less
8738 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8739 it can be booted manually. The runtime guide has more information and
8741 * native: All I/O functionality except signals has been implemented.
8742 * green: Task spawning with `libgreen` has been optimized with stack caching
8743 and various trimming of code.
8744 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8745 * sync: The `extra::sync` module has been updated to modern rust (and moved
8746 to the `sync` library), tweaking and improving various interfaces while
8747 dropping redundant functionality.
8748 * sync: A new `Barrier` type has been added to the `sync` library.
8749 * sync: An efficient mutex for native and green tasks has been implemented.
8750 * serialize: The `base64` module has seen some improvement. It treats
8751 newlines better, has non-string error values, and has seen general
8753 * fourcc: A `fourcc!` macro was introduced
8754 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8755 hexadecimal literal.
8758 * `rustpkg` has been deprecated and removed from the main repository. Its
8759 replacement, `cargo`, is under development.
8760 * Nightly builds of rust are now available
8761 * The memory usage of rustc has been improved many times throughout this
8763 * The build process supports disabling rpath support for the rustc binary
8765 * Code generation has improved in some cases, giving more information to the
8766 LLVM optimization passes to enable more extensive optimizations.
8767 * Debuginfo compatibility with lldb on OSX has been restored.
8768 * The master branch is now gated on an android bot, making building for
8769 android much more reliable.
8770 * Output flags have been centralized into one `--emit` flag.
8771 * Crate type flags have been centralized into one `--crate-type` flag.
8772 * Codegen flags have been consolidated behind a `-C` flag.
8773 * Linking against outdated crates now has improved error messages.
8774 * Error messages with lifetimes will often suggest how to annotate the
8775 function to fix the error.
8776 * Many more types are documented in the standard library, and new guides
8778 * Many `rustdoc` improvements:
8779 * code blocks are syntax highlighted.
8780 * render standalone markdown files.
8781 * the --test flag tests all code blocks by default.
8782 * exported macros are displayed.
8783 * re-exported types have their documentation inlined at the location of the
8785 * search works across crates that have been rendered to the same output
8789 Version 0.9 (2014-01-09)
8790 ==========================
8792 * ~1800 changes, numerous bugfixes
8795 * The `float` type has been removed. Use `f32` or `f64` instead.
8796 * A new facility for enabling experimental features (feature gating) has
8797 been added, using the crate-level `#[feature(foo)]` attribute.
8798 * Managed boxes (@) are now behind a feature gate
8799 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8800 standard library's `Gc` or `Rc` types instead.
8801 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8802 * Jumping back to the top of a loop is now done with `continue` instead of
8804 * Strings can no longer be mutated through index assignment.
8805 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8806 hash delimiters, as in `r###"foo"###`.
8807 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8809 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8810 * `@fn`s have been removed.
8811 * `do` only works with procs in order to make it obvious what the cost
8813 * Single-element tuple-like structs can no longer be dereferenced to
8814 obtain the inner value. A more comprehensive solution for overloading
8815 the dereference operator will be provided in the future.
8816 * The `#[link(...)]` attribute has been replaced with
8817 `#[crate_id = "name#vers"]`.
8818 * Empty `impl`s must be terminated with empty braces and may not be
8819 terminated with a semicolon.
8820 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8821 no longer has any special meaning.
8822 * The old `fmt!` string formatting macro has been removed.
8823 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8824 `print!` and `println!`.
8825 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8826 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8827 `extern mod foo = "bar"` instead.
8828 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8829 * Macros can have attributes.
8830 * Macros can expand to items with attributes.
8831 * Macros can expand to multiple items.
8832 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8833 * Comments may be nested.
8834 * Values automatically coerce to trait objects they implement, without
8836 * Enum discriminants are no longer an entire word but as small as needed to
8837 contain all the variants. The `repr` attribute can be used to override
8838 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8839 `#[repr(C)]` to match C enums.
8840 * Non-string literals are not allowed in attributes (they never worked).
8841 * The FFI now supports variadic functions.
8842 * Octal numeric literals, as in `0o7777`.
8843 * The `concat!` syntax extension performs compile-time string concatenation.
8844 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8845 removed as Rust no longer uses segmented stacks.
8846 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8847 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8848 not `*`; ignoring remaining fields of a struct is also done with `..`,
8849 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8850 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8851 * `rustc` supports the "system" calling convention, which defaults to the
8852 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8854 * The `type_overflow` lint (default: warn) checks literals for overflow.
8855 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8856 * The `attribute_usage` lint (default: warn) warns about unknown
8858 * The `unknown_features` lint (default: warn) warns about unknown
8860 * The `dead_code` lint (default: warn) checks for dead code.
8861 * Rust libraries can be linked statically to one another
8862 * `#[link_args]` is behind the `link_args` feature gate.
8863 * Native libraries are now linked with `#[link(name = "foo")]`
8864 * Native libraries can be statically linked to a rust crate
8865 (`#[link(name = "foo", kind = "static")]`).
8866 * Native OS X frameworks are now officially supported
8867 (`#[link(name = "foo", kind = "framework")]`).
8868 * The `#[thread_local]` attribute creates thread-local (not task-local)
8869 variables. Currently behind the `thread_local` feature gate.
8870 * The `return` keyword may be used in closures.
8871 * Types that can be copied via a memcpy implement the `Pod` kind.
8872 * The `cfg` attribute can now be used on struct fields and enum variants.
8875 * std: The `option` and `result` API's have been overhauled to make them
8876 simpler, more consistent, and more composable.
8877 * std: The entire `std::io` module has been replaced with one that is
8878 more comprehensive and that properly interfaces with the underlying
8879 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8881 * std: `io::util` contains a number of useful implementations of
8882 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8883 `ZeroReader`, `TeeReader`.
8884 * std: The reference counted pointer type `extra::rc` moved into std.
8885 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8886 just a wrapper around it).
8887 * std: The `Either` type has been removed.
8888 * std: `fmt::Default` can be implemented for any type to provide default
8889 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8890 * std: The `rand` API continues to be tweaked.
8891 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8892 on failure in gdb, is now named `rust_fail`.
8893 * std: The `each_key` and `each_value` methods on `HashMap` have been
8894 replaced by the `keys` and `values` iterators.
8895 * std: Functions dealing with type size and alignment have moved from the
8896 `sys` module to the `mem` module.
8897 * std: The `path` module was written and API changed.
8898 * std: `str::from_utf8` has been changed to cast instead of allocate.
8899 * std: `starts_with` and `ends_with` methods added to vectors via the
8900 `ImmutableEqVector` trait, which is in the prelude.
8901 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8902 if the index is out of bounds.
8903 * std: Task failure no longer propagates between tasks, as the model was
8904 complex, expensive, and incompatible with thread-based tasks.
8905 * std: The `Any` type can be used for dynamic typing.
8906 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8908 * std: Methods that produce iterators generally do not have an `_iter`
8910 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8911 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8912 * std: `util::ignore` renamed to `prelude::drop`.
8913 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8915 * std: `vec::raw` has seen a lot of cleanup and API changes.
8916 * std: The standard library no longer includes any C++ code, and very
8917 minimal C, eliminating the dependency on libstdc++.
8918 * std: Runtime scheduling and I/O functionality has been factored out into
8919 extensible interfaces and is now implemented by two different crates:
8920 libnative, for native threading and I/O; and libgreen, for green threading
8921 and I/O. This paves the way for using the standard library in more limited
8922 embedded environments.
8923 * std: The `comm` module has been rewritten to be much faster, have a
8924 simpler, more consistent API, and to work for both native and green
8926 * std: All libuv dependencies have been moved into the rustuv crate.
8927 * native: New implementations of runtime scheduling on top of OS threads.
8928 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8930 * green: The green thread scheduler and message passing types are almost
8932 * extra: The `flatpipes` module had bitrotted and was removed.
8933 * extra: All crypto functions have been removed and Rust now has a policy of
8934 not reimplementing crypto in the standard library. In the future crypto
8935 will be provided by external crates with bindings to established libraries.
8936 * extra: `c_vec` has been modernized.
8937 * extra: The `sort` module has been removed. Use the `sort` method on
8941 * The `rust` and `rusti` commands have been removed, due to lack of
8943 * `rustdoc` was completely rewritten.
8944 * `rustdoc` can test code examples in documentation.
8945 * `rustpkg` can test packages with the argument, 'test'.
8946 * `rustpkg` supports arbitrary dependencies, including C libraries.
8947 * `rustc`'s support for generating debug info is improved again.
8948 * `rustc` has better error reporting for unbalanced delimiters.
8949 * `rustc`'s JIT support was removed due to bitrot.
8950 * Executables and static libraries can be built with LTO (-Z lto)
8951 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8955 Version 0.8 (2013-09-26)
8956 ============================
8958 * ~2200 changes, numerous bugfixes
8961 * The `for` loop syntax has changed to work with the `Iterator` trait.
8962 * At long last, unwinding works on Windows.
8963 * Default methods are ready for use.
8964 * Many trait inheritance bugs fixed.
8965 * Owned and borrowed trait objects work more reliably.
8966 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8967 * rustc can omit emission of code for the `debug!` macro if it is passed
8969 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8970 for foo.rs, then foo/mod.rs, and will generate an error when both are
8972 * Strings no longer contain trailing nulls. The new `std::c_str` module
8973 provides new mechanisms for converting to C strings.
8974 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8975 * The FFI has been overhauled such that foreign functions are called directly,
8976 instead of through a stack-switching wrapper.
8977 * Calling a foreign function must be done through a Rust function with the
8978 `#[fixed_stack_segment]` attribute.
8979 * The `externfn!` macro can be used to declare both a foreign function and
8980 a `#[fixed_stack_segment]` wrapper at once.
8981 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8982 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8983 * `priv` is disallowed everywhere except for struct fields and enum variants.
8984 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8985 * `ref` bindings in irrefutable patterns work correctly now.
8986 * `char` is now prevented from containing invalid code points.
8987 * Casting to `bool` is no longer allowed.
8988 * `\0` is now accepted as an escape in chars and strings.
8989 * `yield` is a reserved keyword.
8990 * `typeof` is a reserved keyword.
8991 * Crates may be imported by URL with `extern mod foo = "url";`.
8992 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8993 * Static vectors can be initialized with repeating elements,
8994 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8995 * Static structs can be initialized with functional record update,
8996 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8997 * `cfg!` can be used to conditionally execute code based on the crate
8998 configuration, similarly to `#[cfg(...)]`.
8999 * The `unnecessary_qualification` lint detects unneeded module
9000 prefixes (default: allow).
9001 * Arithmetic operations have been implemented on the SIMD types in
9002 `std::unstable::simd`.
9003 * Exchange allocation headers were removed, reducing memory usage.
9004 * `format!` implements a completely new, extensible, and higher-performance
9005 string formatting system. It will replace `fmt!`.
9006 * `print!` and `println!` write formatted strings (using the `format!`
9007 extension) to stdout.
9008 * `write!` and `writeln!` write formatted strings (using the `format!`
9009 extension) to the new Writers in `std::rt::io`.
9010 * The library section in which a function or static is placed may
9011 be specified with `#[link_section = "..."]`.
9012 * The `proto!` syntax extension for defining bounded message protocols
9014 * `macro_rules!` is hygienic for `let` declarations.
9015 * The `#[export_name]` attribute specifies the name of a symbol.
9016 * `unreachable!` can be used to indicate unreachable code, and fails
9020 * std: Transitioned to the new runtime, written in Rust.
9021 * std: Added an experimental I/O library, `rt::io`, based on the new
9023 * std: A new generic `range` function was added to the prelude, replacing
9024 `uint::range` and friends.
9025 * std: `range_rev` no longer exists. Since range is an iterator it can be
9026 reversed with `range(lo, hi).invert()`.
9027 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9028 renamed to `unwrap_or`.
9029 * std: The `iterator` module was renamed to `iter`.
9030 * std: Integral types now support the `checked_add`, `checked_sub`, and
9031 `checked_mul` operations for detecting overflow.
9032 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9034 * std: Methods are standardizing on conventions for casting methods:
9035 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9037 * std: The `CString` type in `c_str` provides new ways to convert to and
9039 * std: `DoubleEndedIterator` can yield elements in two directions.
9040 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9042 * std: `str::from_bytes` renamed to `str::from_utf8`.
9043 * std: `pop_opt` and `shift_opt` methods added to vectors.
9044 * std: The task-local data interface no longer uses @, and keys are
9045 no longer function pointers.
9046 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9047 * std: Added `SharedPort` to `comm`.
9048 * std: `Eq` has a default method for `ne`; only `eq` is required
9050 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9051 is required in implementations.
9052 * std: `is_utf8` performance is improved, impacting many string functions.
9053 * std: `os::MemoryMap` provides cross-platform mmap.
9054 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9055 are not 'in-bounds' are considered undefined.
9056 * std: Many freestanding functions in `vec` removed in favor of methods.
9057 * std: Many freestanding functions on scalar types removed in favor of
9059 * std: Many options to task builders were removed since they don't make
9060 sense in the new scheduler design.
9061 * std: More containers implement `FromIterator` so can be created by the
9063 * std: More complete atomic types in `unstable::atomics`.
9064 * std: `comm::PortSet` removed.
9065 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9066 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9067 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9068 default implementations.
9069 * std: Various `from_str` functions were removed in favor of a generic
9070 `from_str` which is available in the prelude.
9071 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9072 * extra: `dlist`, the doubly-linked list was modernized.
9073 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9074 * extra: Added `glob` module, replacing `std::os::glob`.
9075 * extra: `rope` was removed.
9076 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9077 * extra: `net`, and `timer` were removed. The experimental replacements
9078 are `std::rt::io::net` and `std::rt::io::timer`.
9079 * extra: Iterators implemented for `SmallIntMap`.
9080 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9081 * extra: `SmallIntSet` removed. Use `BitvSet`.
9082 * extra: Performance of JSON parsing greatly improved.
9083 * extra: `semver` updated to SemVer 2.0.0.
9084 * extra: `term` handles more terminals correctly.
9085 * extra: `dbg` module removed.
9086 * extra: `par` module removed.
9087 * extra: `future` was cleaned up, with some method renames.
9088 * extra: Most free functions in `getopts` were converted to methods.
9091 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9092 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9093 similarly to gcc's `--march` flag.
9094 * rustc's performance compiling small crates is much better.
9095 * rustpkg has received many improvements.
9096 * rustpkg supports git tags as package IDs.
9097 * rustpkg builds into target-specific directories so it can be used for
9099 * The number of concurrent test tasks is controlled by the environment
9100 variable RUST_TEST_TASKS.
9101 * The test harness can now report metrics for benchmarks.
9102 * All tools have man pages.
9103 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9104 * The runtime uses jemalloc for allocations.
9105 * Segmented stacks are temporarily disabled as part of the transition to
9106 the new runtime. Stack overflows are possible!
9107 * A new documentation backend, rustdoc_ng, is available for use. It is
9108 still invoked through the normal `rustdoc` command.
9111 Version 0.7 (2013-07-03)
9112 =======================
9114 * ~2000 changes, numerous bugfixes
9117 * `impl`s no longer accept a visibility qualifier. Put them on methods
9119 * The borrow checker has been rewritten with flow-sensitivity, fixing
9120 many bugs and inconveniences.
9121 * The `self` parameter no longer implicitly means `&'self self`,
9122 and can be explicitly marked with a lifetime.
9123 * Overloadable compound operators (`+=`, etc.) have been temporarily
9124 removed due to bugs.
9125 * The `for` loop protocol now requires `for`-iterators to return `bool`
9126 so they compose better.
9127 * The `Durable` trait is replaced with the `'static` bounds.
9128 * Trait default methods work more often.
9129 * Structs with the `#[packed]` attribute have byte alignment and
9130 no padding between fields.
9131 * Type parameters bound by `Copy` must now be copied explicitly with
9133 * It is now illegal to move out of a dereferenced unsafe pointer.
9134 * `Option<~T>` is now represented as a nullable pointer.
9135 * `@mut` does dynamic borrow checks correctly.
9136 * The `main` function is only detected at the topmost level of the crate.
9137 The `#[main]` attribute is still valid anywhere.
9138 * Struct fields may no longer be mutable. Use inherited mutability.
9139 * The `#[no_send]` attribute makes a type that would otherwise be
9141 * The `#[no_freeze]` attribute makes a type that would otherwise be
9143 * Unbounded recursion will abort the process after reaching the limit
9144 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9145 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9146 are never implicitly copyable.
9147 * `#[static_assert]` makes compile-time assertions about static bools.
9148 * At long last, 'argument modes' no longer exist.
9149 * The rarely used `use mod` statement no longer exists.
9152 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9154 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9155 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9157 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9158 and unsuffixed integer literals.
9161 * The `core` crate was renamed to `std`.
9162 * The `std` crate was renamed to `extra`.
9163 * More and improved documentation.
9164 * std: `iterator` module for external iterator objects.
9165 * Many old-style (internal, higher-order function) iterators replaced by
9166 implementations of `Iterator`.
9167 * std: Many old internal vector and string iterators,
9168 incl. `any`, `all`. removed.
9169 * std: The `finalize` method of `Drop` renamed to `drop`.
9170 * std: The `drop` method now takes `&mut self` instead of `&self`.
9171 * std: The prelude no longer re-exports any modules, only types and traits.
9172 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9173 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9174 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9175 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9176 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9177 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9178 * std: Many types implement `Clone`.
9179 * std: `path` type renamed to `Path`.
9180 * std: `mut` module and `Mut` type removed.
9181 * std: Many standalone functions removed in favor of methods and iterators
9182 in `vec`, `str`. In the future methods will also work as functions.
9183 * std: `reinterpret_cast` removed. Use `transmute`.
9184 * std: ascii string handling in `std::ascii`.
9185 * std: `Rand` is implemented for ~/@.
9186 * std: `run` module for spawning processes overhauled.
9187 * std: Various atomic types added to `unstable::atomic`.
9188 * std: Various types implement `Zero`.
9189 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9190 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9191 * std: Added `os::mkdir_recursive`.
9192 * std: Added `os::glob` function performs filesystems globs.
9193 * std: `FuzzyEq` renamed to `ApproxEq`.
9194 * std: `Map` now defines `pop` and `swap` methods.
9195 * std: `Cell` constructors converted to static methods.
9196 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9197 * extra: `flate` module moved from `std` to `extra`.
9198 * extra: `fileinput` module for iterating over a series of files.
9199 * extra: `Complex` number type and `complex` module.
9200 * extra: `Rational` number type and `rational` module.
9201 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9202 * extra: `term` uses terminfo now, is more correct.
9203 * extra: `arc` functions converted to methods.
9204 * extra: Implementation of fixed output size variations of SHA-2.
9207 * `unused_variables` lint mode for unused variables (default: warn).
9208 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9210 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9212 * `dead_assignment` lint mode for unread variables (default: warn).
9213 * `unnecessary_allocation` lint mode detects some heap allocations that are
9214 immediately borrowed so could be written without allocating (default: warn).
9215 * `missing_doc` lint mode (default: allow).
9216 * `unreachable_code` lint mode (default: warn).
9217 * The `rusti` command has been rewritten and a number of bugs addressed.
9218 * rustc outputs in color on more terminals.
9219 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9220 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9221 * Compiling with `-g` will make the binary record information about
9222 dynamic borrowcheck failures for debugging.
9223 * rustdoc has a nicer stylesheet.
9224 * Various improvements to rustdoc.
9225 * Improvements to rustpkg (see the detailed release notes).
9228 Version 0.6 (2013-04-03)
9229 ========================
9231 * ~2100 changes, numerous bugfixes
9234 * The self type parameter in traits is now spelled `Self`
9235 * The `self` parameter in trait and impl methods must now be explicitly
9236 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9237 * Static methods no longer require the `static` keyword and instead
9238 are distinguished by the lack of a `self` parameter
9239 * Replaced the `Durable` trait with the `'static` lifetime
9240 * The old closure type syntax with the trailing sigil has been
9241 removed in favor of the more consistent leading sigil
9242 * `super` is a keyword, and may be prefixed to paths
9243 * Trait bounds are separated with `+` instead of whitespace
9244 * Traits are implemented with `impl Trait for Type`
9245 instead of `impl Type: Trait`
9246 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9247 * The `export` keyword has finally been removed
9248 * The `move` keyword has been removed (see "Semantic changes")
9249 * The interior mutability qualifier on vectors, `[mut T]`, has been
9250 removed. Use `&mut [T]`, etc.
9251 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9252 * `fail` is no longer a keyword. Use `fail!()`
9253 * `assert` is no longer a keyword. Use `assert!()`
9254 * `log` is no longer a keyword. use `debug!`, etc.
9255 * 1-tuples may be represented as `(T,)`
9256 * Struct fields may no longer be `mut`. Use inherited mutability,
9257 `@mut T`, `core::mut` or `core::cell`
9258 * `extern mod { ... }` is no longer valid syntax for foreign
9259 function modules. Use extern blocks: `extern { ... }`
9260 * Newtype enums removed. Use tuple-structs.
9261 * Trait implementations no longer support visibility modifiers
9262 * Pattern matching over vectors improved and expanded
9263 * `const` renamed to `static` to correspond to lifetime name,
9264 and make room for future `static mut` unsafe mutable globals.
9265 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9266 * `Clone` implementations can be automatically generated with
9267 `#[deriving(Clone)]`
9268 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9269 instead of `foo as Bar`.
9270 * Fixed length vector types are now written as `[int, .. 3]`
9271 instead of `[int * 3]`.
9272 * Fixed length vector types can express the length as a constant
9273 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9276 * Types with owned pointers or custom destructors move by default,
9277 eliminating the `move` keyword
9278 * All foreign functions are considered unsafe
9279 * &mut is now unaliasable
9280 * Writes to borrowed @mut pointers are prevented dynamically
9282 * The name of the main function can be customized using #[main]
9283 * The default type of an inferred closure is &fn instead of @fn
9284 * `use` statements may no longer be "chained" - they cannot import
9285 identifiers imported by previous `use` statements
9286 * `use` statements are crate relative, importing from the "top"
9287 of the crate by default. Paths may be prefixed with `super::`
9288 or `self::` to change the search behavior.
9289 * Method visibility is inherited from the implementation declaration
9290 * Structural records have been removed
9291 * Many more types can be used in static items, including enums
9292 'static-lifetime pointers and vectors
9293 * Pattern matching over vectors improved and expanded
9294 * Typechecking of closure types has been overhauled to
9295 improve inference and eliminate unsoundness
9296 * Macros leave scope at the end of modules, unless that module is
9297 tagged with #[macro_escape]
9300 * Added big integers to `std::bigint`
9301 * Removed `core::oldcomm` module
9302 * Added pipe-based `core::comm` module
9303 * Numeric traits have been reorganized under `core::num`
9304 * `vec::slice` finally returns a slice
9305 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9306 * Containers reorganized around traits in `core::container`
9307 * `core::dvec` removed, `~[T]` is a drop-in replacement
9308 * `core::send_map` renamed to `core::hashmap`
9309 * `std::map` removed; replaced with `core::hashmap`
9310 * `std::treemap` reimplemented as an owned balanced tree
9311 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9312 * `core::trie` added as a fast ordered map for integer keys
9313 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9314 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9315 overload the comparison operators, whereas `TotalOrd` is used
9316 by certain container types
9319 * Replaced the 'cargo' package manager with 'rustpkg'
9320 * Added all-purpose 'rust' tool
9321 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9322 * rustc now *attempts* to offer spelling suggestions
9323 * Improved support for ARM and Android
9324 * Preliminary MIPS backend
9325 * Improved foreign function ABI implementation for x86, x86_64
9326 * Various memory usage improvements
9327 * Rust code may be embedded in foreign code under limited circumstances
9328 * Inline assembler supported by new asm!() syntax extension.
9331 Version 0.5 (2012-12-21)
9332 ===========================
9334 * ~900 changes, numerous bugfixes
9337 * Removed `<-` move operator
9338 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9339 * Removed old fixed length vector syntax - `[T]/N`
9340 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9341 * Macros may now expand to items and statements
9342 * `a.b()` is always parsed as a method call, never as a field projection
9343 * `Eq` and `IterBytes` implementations can be automatically generated
9344 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9345 * Removed the special crate language for `.rc` files
9346 * Function arguments may consist of any irrefutable pattern
9349 * `&` and `~` pointers may point to objects
9350 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9351 * Enum variants may be structs
9352 * Destructors can be added to all nominal types with the Drop trait
9353 * Structs and nullary enum variants may be constants
9354 * Values that cannot be implicitly copied are now automatically moved
9355 without writing `move` explicitly
9356 * `&T` may now be coerced to `*T`
9357 * Coercions happen in `let` statements as well as function calls
9358 * `use` statements now take crate-relative paths
9359 * The module and type namespaces have been merged so that static
9360 method names can be resolved under the trait in which they are
9363 * Improved support for language features
9364 * Trait inheritance works in many scenarios
9365 * More support for explicit self arguments in methods - `self`, `&self`
9366 `@self`, and `~self` all generally work as expected
9367 * Static methods work in more situations
9368 * Experimental: Traits may declare default methods for the implementations
9372 * New condition handling system in `core::condition`
9373 * Timsort added to `std::sort`
9374 * New priority queue, `std::priority_queue`
9375 * Pipes for serializable types, `std::flatpipes'
9376 * Serialization overhauled to be trait-based
9377 * Expanded `getopts` definitions
9378 * Moved futures to `std`
9379 * More functions are pure now
9380 * `core::comm` renamed to `oldcomm`. Still deprecated
9381 * `rustdoc` and `cargo` are libraries now
9384 * Added a preliminary REPL, `rusti`
9385 * License changed from MIT to dual MIT/APL2
9388 Version 0.4 (2012-10-15)
9389 ==========================
9391 * ~2000 changes, numerous bugfixes
9394 * All keywords are now strict and may not be used as identifiers anywhere
9395 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9396 'of', 'with', 'to', 'class'.
9397 * Classes are replaced with simpler structs
9398 * Explicit method self types
9399 * `ret` became `return` and `alt` became `match`
9400 * `import` is now `use`; `use is now `extern mod`
9401 * `extern mod { ... }` is now `extern { ... }`
9402 * `use mod` is the recommended way to import modules
9403 * `pub` and `priv` replace deprecated export lists
9404 * The syntax of `match` pattern arms now uses fat arrow (=>)
9405 * `main` no longer accepts an args vector; use `os::args` instead
9408 * Trait implementations are now coherent, ala Haskell typeclasses
9409 * Trait methods may be static
9410 * Argument modes are deprecated
9411 * Borrowed pointers are much more mature and recommended for use
9412 * Strings and vectors in the static region are stored in constant memory
9413 * Typestate was removed
9414 * Resolution rewritten to be more reliable
9415 * Support for 'dual-mode' data structures (freezing and thawing)
9418 * Most binary operators can now be overloaded via the traits in
9420 * `std::net::url` for representing URLs
9421 * Sendable hash maps in `core::send_map`
9422 * `core::task' gained a (currently unsafe) task-local storage API
9425 * An efficient new intertask communication primitive called the pipe,
9426 along with a number of higher-level channel types, in `core::pipes`
9427 * `std::arc`, an atomically reference counted, immutable, shared memory
9429 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9430 * Futures are now based on pipes and sendable
9431 * More robust linked task failure
9432 * Improved task builder API
9435 * Improved error reporting
9436 * Preliminary JIT support
9437 * Preliminary work on precise GC
9438 * Extensive architectural improvements to rustc
9439 * Begun a transition away from buggy C++-based reflection (shape) code to
9440 Rust-based (visitor) code
9441 * All hash functions and tables converted to secure, randomized SipHash
9444 Version 0.3 (2012-07-12)
9445 ========================
9447 * ~1900 changes, numerous bugfixes
9449 * New coding conveniences
9450 * Integer-literal suffix inference
9451 * Per-item control over warnings, errors
9452 * #[cfg(windows)] and #[cfg(unix)] attributes
9453 * Documentation comments
9454 * More compact closure syntax
9455 * 'do' expressions for treating higher-order functions as
9457 * *-patterns (wildcard extended to all constructor fields)
9460 * Name resolution pass and exhaustiveness checker rewritten
9461 * Region pointers and borrow checking supersede alias
9463 * Init-ness checking is now provided by a region-based liveness
9464 pass instead of the typestate pass; same for last-use analysis
9465 * Extensive work on region pointers
9467 * Experimental new language features
9468 * Slices and fixed-size, interior-allocated vectors
9469 * #!-comments for lang versioning, shell execution
9470 * Destructors and iface implementation for classes;
9471 type-parameterized classes and class methods
9472 * 'const' type kind for types that can be used to implement
9473 shared-memory concurrency patterns
9477 * Removal of various obsolete features
9478 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9479 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9481 * Constructs: do-while loops ('do' repurposed), fn binding,
9482 resources (replaced by destructors)
9484 * Compiler reorganization
9485 * Syntax-layer of compiler split into separate crate
9486 * Clang (from LLVM project) integrated into build
9487 * Typechecker split into sub-modules
9490 * New time functions
9491 * Extension methods for many built-in types
9492 * Arc: atomic-refcount read-only / exclusive-use shared cells
9493 * Par: parallel map and search routines
9494 * Extensive work on libuv interface
9495 * Much vector code moved to libraries
9496 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9497 #include, #include_str, #include_bin
9500 * Cargo automatically resolves dependencies
9503 Version 0.2 (2012-03-29)
9504 =========================
9506 * >1500 changes, numerous bugfixes
9508 * New docs and doc tooling
9510 * New port: FreeBSD x86_64
9512 * Compilation model enhancements
9513 * Generics now specialized, multiply instantiated
9514 * Functions now inlined across separate crates
9516 * Scheduling, stack and threading fixes
9517 * Noticeably improved message-passing performance
9518 * Explicit schedulers
9522 * Experimental new language features
9523 * Operator overloading
9527 * Various language extensions
9528 * C-callback function types: 'crust fn ...'
9529 * Infinite-loop construct: 'loop { ... }'
9530 * Shorten 'mutable' to 'mut'
9531 * Required mutable-local qualifier: 'let mut ...'
9532 * Basic glob-exporting: 'export foo::*;'
9533 * Alt now exhaustive, 'alt check' for runtime-checked
9534 * Block-function form of 'for' loop, with 'break' and 'ret'.
9537 * AST quasi-quote syntax extension
9538 * Revived libuv interface
9539 * New modules: core::{future, iter}, std::arena
9540 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9541 * Extensive cleanup, regularization in libstd, libcore
9544 Version 0.1 (2012-01-20)
9545 ===============================
9547 * Most language features work, including:
9548 * Unique pointers, unique closures, move semantics
9549 * Interface-constrained generics
9550 * Static interface dispatch
9552 * Multithread task scheduling
9553 * Typestate predicates
9554 * Failure unwinding, destructors
9555 * Pattern matching and destructuring assignment
9556 * Lightweight block-lambda syntax
9557 * Preliminary macro-by-example
9559 * Compiler works with the following configurations:
9560 * Linux: x86 and x86_64 hosts and targets
9561 * macOS: x86 and x86_64 hosts and targets
9562 * Windows: x86 hosts and targets
9564 * Cross compilation / multi-target configuration supported.
9566 * Preliminary API-documentation and package-management tools included.
9570 * Documentation is incomplete.
9572 * Performance is below intended target.
9574 * Standard library APIs are subject to extensive change, reorganization.
9576 * Language-level versioning is not yet operational - future code will