1 Version 1.45.2 (2020-08-03)
2 ==========================
4 * [Fix bindings in tuple struct patterns][74954]
5 * [Fix track_caller integration with trait objects][74784]
7 [74954]: https://github.com/rust-lang/rust/issues/74954
8 [74784]: https://github.com/rust-lang/rust/issues/74784
10 Version 1.45.1 (2020-07-30)
11 ==========================
13 * [Fix const propagation with references.][73613]
14 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
15 * [Avoid spurious implicit region bound.][74509]
16 * [Install clippy on x.py install][74457]
18 [73613]: https://github.com/rust-lang/rust/pull/73613
19 [73078]: https://github.com/rust-lang/rust/issues/73078
20 [74509]: https://github.com/rust-lang/rust/pull/74509
21 [74457]: https://github.com/rust-lang/rust/pull/74457
23 Version 1.45.0 (2020-07-16)
24 ==========================
28 - [Out of range float to int conversions using `as` has been defined as a saturating
29 conversion.][71269] This was previously undefined behaviour, but you can use the
30 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
31 may be desirable in rare performance sensitive situations.
32 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
34 - [Function like procedural macros can now be used in expression, pattern, and statement
35 positions.][68717] This means you can now use a function-like procedural macro
36 anywhere you can use a declarative (`macro_rules!`) macro.
40 - [You can now override individual target features through the `target-feature`
41 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
42 equivalent to `-C target-feature=+avx2,+fma`.
43 - [Added the `force-unwind-tables` flag.][69984] This option allows
44 rustc to always generate unwind tables regardless of panic strategy.
45 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
46 to include LLVM bitcode into generated `rlib`s (this is on by default).
47 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
48 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
49 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
51 \* Refer to Rust's [platform support page][forge-platform-support] for more
52 information on Rust's tiered platform support.
57 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
59 - [`proc_macro::TokenStream` now implements `Default`.][72234]
60 - [You can now use `char` with
61 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
62 a range of codepoints.][72413] E.g.
63 you can now write the following;
69 // Prints "abcdefghijklmnopqrstuvwxyz"
71 - [`OsString` now implements `FromStr`.][71662]
72 - [The `saturating_neg` method has been added to all signed integer primitive
73 types, and the `saturating_abs` method has been added for all integer
74 primitive types.][71886]
75 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
76 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
78 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
79 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
80 integer types.][69813]
81 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
82 integer types.][72324]
83 - [The `fetch_update` method has been added to all atomic integer types.][71843]
88 - [`BTreeMap::remove_entry`]
90 - [`rc::Weak::as_ptr`]
91 - [`rc::Weak::from_raw`]
92 - [`rc::Weak::into_raw`]
93 - [`str::strip_prefix`]
94 - [`str::strip_suffix`]
95 - [`sync::Weak::as_ptr`]
96 - [`sync::Weak::from_raw`]
97 - [`sync::Weak::into_raw`]
98 - [`char::UNICODE_VERSION`]
99 - [`Span::resolved_at`]
100 - [`Span::located_at`]
101 - [`Span::mixed_site`]
102 - [`unix::process::CommandExt::arg0`]
107 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
112 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
113 `~~outdated information~~` becomes "~~outdated information~~".
114 - [Added an emoji to Rustdoc's deprecated API message.][72014]
118 - [Trying to self initialize a static value (that is creating a value using
119 itself) is unsound and now causes a compile error.][71140]
120 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
121 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
122 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
123 previously undocumented and not intended for public use. Rustdoc still provides
124 a non-zero exit code on errors.
125 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
126 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
127 flags while cargo is adding `embed-bitcode` itself. The recommended way to
128 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
129 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
133 - [Make clippy a git subtree instead of a git submodule][70655]
134 - [Unify the undo log of all snapshot types][69464]
136 [71848]: https://github.com/rust-lang/rust/issues/71848/
137 [73420]: https://github.com/rust-lang/rust/issues/73420/
138 [72324]: https://github.com/rust-lang/rust/pull/72324/
139 [71843]: https://github.com/rust-lang/rust/pull/71843/
140 [71886]: https://github.com/rust-lang/rust/pull/71886/
141 [72234]: https://github.com/rust-lang/rust/pull/72234/
142 [72239]: https://github.com/rust-lang/rust/pull/72239/
143 [72397]: https://github.com/rust-lang/rust/pull/72397/
144 [72413]: https://github.com/rust-lang/rust/pull/72413/
145 [72014]: https://github.com/rust-lang/rust/pull/72014/
146 [72062]: https://github.com/rust-lang/rust/pull/72062/
147 [72094]: https://github.com/rust-lang/rust/pull/72094/
148 [72133]: https://github.com/rust-lang/rust/pull/72133/
149 [71900]: https://github.com/rust-lang/rust/pull/71900/
150 [71928]: https://github.com/rust-lang/rust/pull/71928/
151 [71662]: https://github.com/rust-lang/rust/pull/71662/
152 [71716]: https://github.com/rust-lang/rust/pull/71716/
153 [71447]: https://github.com/rust-lang/rust/pull/71447/
154 [71269]: https://github.com/rust-lang/rust/pull/71269/
155 [71095]: https://github.com/rust-lang/rust/pull/71095/
156 [71140]: https://github.com/rust-lang/rust/pull/71140/
157 [70655]: https://github.com/rust-lang/rust/pull/70655/
158 [70705]: https://github.com/rust-lang/rust/pull/70705/
159 [69984]: https://github.com/rust-lang/rust/pull/69984/
160 [69813]: https://github.com/rust-lang/rust/pull/69813/
161 [69464]: https://github.com/rust-lang/rust/pull/69464/
162 [68717]: https://github.com/rust-lang/rust/pull/68717/
163 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
164 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
165 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
166 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
167 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
168 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
169 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
170 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
171 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
172 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
173 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
174 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
175 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
176 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
177 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
178 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
179 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
182 Version 1.44.1 (2020-06-18)
183 ===========================
185 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
186 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
187 * [Fix crashes when finding backtrace on macOS.][71397]
188 * [Clippy applies lint levels into different files.][clippy/5356]
190 [71397]: https://github.com/rust-lang/rust/issues/71397
191 [73078]: https://github.com/rust-lang/rust/issues/73078
192 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
193 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
196 Version 1.44.0 (2020-06-04)
197 ==========================
201 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
202 - [Added the `unused_braces` lint.][70081]
204 **Syntax-only changes**
206 - [Expansion-driven outline module parsing][69838]
211 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
216 These are still rejected semantically, so you will likely receive an error but
217 these changes can be seen and parsed by macros and conditional compilation.
221 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
222 Additionally when in incremental mode rustc defaults to 256 codegen units.
223 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
224 a panic is thrown.][67502]
225 - [Added tier 3\* support for the `aarch64-unknown-none` and
226 `aarch64-unknown-none-softfloat` targets.][68334]
227 - [Added tier 3 support for `arm64-apple-tvos` and
228 `x86_64-apple-tvos` targets.][68191]
233 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
234 `vec![]` to be able to be used in `const` contexts.
235 - [`convert::Infallible` now implements `Hash`.][70281]
236 - [`OsString` now implements `DerefMut` and `IndexMut` returning
237 a `&mut OsStr`.][70048]
238 - [Unicode 13 is now supported.][69929]
239 - [`String` now implements `From<&mut str>`.][69661]
240 - [`IoSlice` now implements `Copy`.][69403]
241 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
242 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
243 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
244 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
245 integer types.][69373]
249 - [`PathBuf::with_capacity`]
250 - [`PathBuf::capacity`]
252 - [`PathBuf::reserve`]
253 - [`PathBuf::reserve_exact`]
254 - [`PathBuf::shrink_to_fit`]
255 - [`f32::to_int_unchecked`]
256 - [`f64::to_int_unchecked`]
257 - [`Layout::align_to`]
258 - [`Layout::pad_to_align`]
264 - [Added the `cargo tree` command which will print a tree graph of
265 your dependencies.][cargo/8062] E.g.
267 mdbook v0.3.2 (/Users/src/rust/mdbook)
269 │ ├── html5ever v0.24.0
271 │ │ │ └── cfg-if v0.1.9
273 │ │ └── markup5ever v0.9.0
274 │ │ ├── log v0.4.8 (*)
276 │ │ │ └── phf_shared v0.7.24
277 │ │ │ ├── siphasher v0.2.3
278 │ │ │ └── unicase v1.4.2
279 │ │ │ [build-dependencies]
280 │ │ │ └── version_check v0.1.5
283 You can also display dependencies on multiple versions of the same crate with
284 `cargo tree -d` (short for `cargo tree --duplicates`).
288 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
289 the version in the sidebar.][69494]
293 - [Rustc now correctly generates static libraries on Windows GNU targets with
294 the `.a` extension, rather than the previous `.lib`.][70937]
295 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
296 - [The `file_name` property in JSON output of macro errors now points the actual
297 source file rather than the previous format of `<NAME macros>`.][70969]
298 **Note:** this may not point to a file that actually exists on the user's system.
299 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
300 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
301 not allow zero initialization such as `NonZeroU8`.][66059] This was
302 previously a warning.
303 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
304 operator has been defined as a saturating operation.][71269] This was previously
305 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
306 continue using the current behaviour, which may be desirable in rare performance
307 sensitive situations.
311 These changes provide no direct user facing benefits, but represent significant
312 improvements to the internals and overall performance of rustc and
315 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
316 - [Replace big JS dict with JSON parsing.][71250]
318 [69373]: https://github.com/rust-lang/rust/pull/69373/
319 [66059]: https://github.com/rust-lang/rust/pull/66059/
320 [68191]: https://github.com/rust-lang/rust/pull/68191/
321 [68899]: https://github.com/rust-lang/rust/pull/68899/
322 [71147]: https://github.com/rust-lang/rust/pull/71147/
323 [71250]: https://github.com/rust-lang/rust/pull/71250/
324 [70937]: https://github.com/rust-lang/rust/pull/70937/
325 [70969]: https://github.com/rust-lang/rust/pull/70969/
326 [70632]: https://github.com/rust-lang/rust/pull/70632/
327 [70281]: https://github.com/rust-lang/rust/pull/70281/
328 [70345]: https://github.com/rust-lang/rust/pull/70345/
329 [70048]: https://github.com/rust-lang/rust/pull/70048/
330 [70081]: https://github.com/rust-lang/rust/pull/70081/
331 [70156]: https://github.com/rust-lang/rust/pull/70156/
332 [71269]: https://github.com/rust-lang/rust/pull/71269/
333 [69838]: https://github.com/rust-lang/rust/pull/69838/
334 [69929]: https://github.com/rust-lang/rust/pull/69929/
335 [69661]: https://github.com/rust-lang/rust/pull/69661/
336 [69778]: https://github.com/rust-lang/rust/pull/69778/
337 [69494]: https://github.com/rust-lang/rust/pull/69494/
338 [69403]: https://github.com/rust-lang/rust/pull/69403/
339 [69033]: https://github.com/rust-lang/rust/pull/69033/
340 [68692]: https://github.com/rust-lang/rust/pull/68692/
341 [68334]: https://github.com/rust-lang/rust/pull/68334/
342 [67502]: https://github.com/rust-lang/rust/pull/67502/
343 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
344 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
345 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
346 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
347 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
348 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
349 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
350 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
351 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
352 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
353 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
354 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
355 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
358 Version 1.43.1 (2020-05-07)
359 ===========================
361 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
362 * [Fixed the stabilization of AVX-512 features.][71473]
363 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
365 [71430]: https://github.com/rust-lang/rust/pull/71430
366 [71473]: https://github.com/rust-lang/rust/issues/71473
367 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
370 Version 1.43.0 (2020-04-23)
371 ==========================
375 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
376 the type inferred correctly.][68129]
377 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
379 **Syntax only changes**
380 - [Allow `type Foo: Ord` syntactically.][69361]
381 - [Fuse associated and extern items up to defaultness.][69194]
382 - [Syntactically allow `self` in all `fn` contexts.][68764]
383 - [Merge `fn` syntax + cleanup item parsing.][68728]
384 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
385 For example, you may now write:
387 macro_rules! mac_trait {
397 These are still rejected *semantically*, so you will likely receive an error but
398 these changes can be seen and parsed by macros and
399 conditional compilation.
404 - [You can now pass multiple lint flags to rustc to override the previous
405 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
406 everything in the `unused` lint group except `unused-variables` which
407 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
408 everything in the `unused` lint group **including** `unused-variables` since
409 the allow flag is specified before the deny flag (and therefore overridden).
410 - [rustc will now prefer your system MinGW libraries over its bundled libraries
411 if they are available on `windows-gnu`.][67429]
412 - [rustc now buffers errors/warnings printed in JSON.][69227]
416 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
417 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
418 respectively.][69538] **Note** These conversions are only available when `N`
420 - [You can now use associated constants on floats and integers directly, rather
421 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
422 `f32::NAN` with no imports.
423 - [`u8::is_ascii` is now `const`.][68984]
424 - [`String` now implements `AsMut<str>`.][68742]
425 - [Added the `primitive` module to `std` and `core`.][67637] This module
426 reexports Rust's primitive types. This is mainly useful in macros
427 where you want avoid these types being shadowed.
428 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
429 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
433 - [`Once::is_completed`]
438 - [`iter::once_with`]
442 - [You can now set config `[profile]`s in your `.cargo/config`, or through
443 your environment.][cargo/7823]
444 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
445 executable path when running integration tests or benchmarks.][cargo/7697]
446 `<name>` is the name of your binary as-is e.g. If you wanted the executable
447 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
451 - [Certain checks in the `const_err` lint were deemed unrelated to const
452 evaluation][69185], and have been moved to the `unconditional_panic` and
453 `arithmetic_overflow` lints.
458 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
459 has been a warning since 1.36.0.
460 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
461 led to some instances being accepted, and now correctly emits a hard error.
463 [69340]: https://github.com/rust-lang/rust/pull/69340
467 These changes provide no direct user facing benefits, but represent significant
468 improvements to the internals and overall performance of `rustc` and
471 - [All components are now built with `opt-level=3` instead of `2`.][67878]
472 - [Improved how rustc generates drop code.][67332]
473 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
474 - [traits: preallocate 2 Vecs of known initial size][69022]
475 - [Avoid exponential behaviour when relating types][68772]
476 - [Skip `Drop` terminators for enum variants without drop glue][68943]
477 - [Improve performance of coherence checks][68966]
478 - [Deduplicate types in the generator witness][68672]
479 - [Invert control in struct_lint_level.][68725]
481 [67332]: https://github.com/rust-lang/rust/pull/67332/
482 [67429]: https://github.com/rust-lang/rust/pull/67429/
483 [67637]: https://github.com/rust-lang/rust/pull/67637/
484 [67642]: https://github.com/rust-lang/rust/pull/67642/
485 [67878]: https://github.com/rust-lang/rust/pull/67878/
486 [67885]: https://github.com/rust-lang/rust/pull/67885/
487 [68129]: https://github.com/rust-lang/rust/pull/68129/
488 [68672]: https://github.com/rust-lang/rust/pull/68672/
489 [68725]: https://github.com/rust-lang/rust/pull/68725/
490 [68728]: https://github.com/rust-lang/rust/pull/68728/
491 [68738]: https://github.com/rust-lang/rust/pull/68738/
492 [68742]: https://github.com/rust-lang/rust/pull/68742/
493 [68764]: https://github.com/rust-lang/rust/pull/68764/
494 [68772]: https://github.com/rust-lang/rust/pull/68772/
495 [68943]: https://github.com/rust-lang/rust/pull/68943/
496 [68952]: https://github.com/rust-lang/rust/pull/68952/
497 [68966]: https://github.com/rust-lang/rust/pull/68966/
498 [68984]: https://github.com/rust-lang/rust/pull/68984/
499 [69022]: https://github.com/rust-lang/rust/pull/69022/
500 [69185]: https://github.com/rust-lang/rust/pull/69185/
501 [69194]: https://github.com/rust-lang/rust/pull/69194/
502 [69201]: https://github.com/rust-lang/rust/pull/69201/
503 [69227]: https://github.com/rust-lang/rust/pull/69227/
504 [69548]: https://github.com/rust-lang/rust/pull/69548/
505 [69256]: https://github.com/rust-lang/rust/pull/69256/
506 [69361]: https://github.com/rust-lang/rust/pull/69361/
507 [69366]: https://github.com/rust-lang/rust/pull/69366/
508 [69538]: https://github.com/rust-lang/rust/pull/69538/
509 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
510 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
511 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
512 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
513 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
514 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
515 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
516 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
519 Version 1.42.0 (2020-03-12)
520 ==========================
524 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
526 fn foo(words: &[&str]) {
528 ["Hello", "World", "!", ..] => println!("Hello World!"),
529 ["Foo", "Bar", ..] => println!("Baz"),
530 rest => println!("{:?}", rest),
534 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
535 that you can create an enum that has the exact layout and ABI of the type
537 - [There are some *syntax-only* changes:][67131]
538 - `default` is syntactically allowed before items in `trait` definitions.
539 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
540 leave out their bodies in favor of `;`.
541 - Bounds on associated types in `impl`s are now syntactically allowed
542 (e.g. `type Foo: Ord;`).
543 - `...` (the C-variadic type) may occur syntactically directly as the type of
544 any function parameter.
546 These are still rejected *semantically*, so you will likely receive an error
547 but these changes can be seen and parsed by procedural macros and
548 conditional compilation.
552 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
553 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
554 - [`Option::{expect,unwrap}` and
555 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
556 pointing to the location where they were called, rather than
557 `core`'s internals. ][67887]
559 \* Refer to Rust's [platform support page][forge-platform-support] for more
560 information on Rust's tiered platform support.
564 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
565 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
566 to implement `Sized`.][67935]
567 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
568 - [`Layout::new` is now `const`.][66254]
569 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
574 - [`CondVar::wait_while`]
575 - [`CondVar::wait_timeout_while`]
577 - [`DebugMap::value`]
578 - [`ManuallyDrop::take`]
580 - [`ptr::slice_from_raw_parts_mut`]
581 - [`ptr::slice_from_raw_parts`]
585 - [You no longer need to include `extern crate proc_macro;` to be able to
586 `use proc_macro;` in the `2018` edition.][cargo/7700]
590 - [`Error::description` has been deprecated, and its use will now produce a
591 warning.][66919] It's recommended to use `Display`/`to_string` instead.
593 [68253]: https://github.com/rust-lang/rust/pull/68253/
594 [68348]: https://github.com/rust-lang/rust/pull/68348/
595 [67935]: https://github.com/rust-lang/rust/pull/67935/
596 [68339]: https://github.com/rust-lang/rust/pull/68339/
597 [68122]: https://github.com/rust-lang/rust/pull/68122/
598 [67712]: https://github.com/rust-lang/rust/pull/67712/
599 [67887]: https://github.com/rust-lang/rust/pull/67887/
600 [67131]: https://github.com/rust-lang/rust/pull/67131/
601 [67233]: https://github.com/rust-lang/rust/pull/67233/
602 [66899]: https://github.com/rust-lang/rust/pull/66899/
603 [66919]: https://github.com/rust-lang/rust/pull/66919/
604 [66254]: https://github.com/rust-lang/rust/pull/66254/
605 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
606 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
607 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
608 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
609 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
610 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
611 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
612 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
613 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
616 Version 1.41.1 (2020-02-27)
617 ===========================
619 * [Always check types of static items][69145]
620 * [Always check lifetime bounds of `Copy` impls][69145]
621 * [Fix miscompilation in callers of `Layout::repeat`][69225]
623 [69225]: https://github.com/rust-lang/rust/issues/69225
624 [69145]: https://github.com/rust-lang/rust/pull/69145
627 Version 1.41.0 (2020-01-30)
628 ===========================
633 - [You can now pass type parameters to foreign items when implementing
634 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
635 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
636 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
637 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
638 - [You can now use any valid identifier in a `format_args` macro.][66847]
639 Previously identifiers starting with an underscore were not allowed.
640 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
641 enum variants.][66183] These are still rejected semantically, but
642 can be seen and parsed by procedural macros and conditional compilation.
647 - [Rustc will now warn if you have unused loop `'label`s.][66325]
648 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
649 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
650 - [You can now pass an arguments file passing the `@path` syntax
651 to rustc.][66172] Note that the format differs somewhat from what is
652 found in other tooling; please see [the documentation][argfile-docs] for
654 - [You can now provide `--extern` flag without a path, indicating that it is
655 available from the search path or specified with an `-L` flag.][64882]
657 \* Refer to Rust's [platform support page][forge-platform-support] for more
658 information on Rust's tiered platform support.
660 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
665 - [The `core::panic` module is now stable.][66771] It was already stable
667 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
668 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
669 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
675 - [`Result::map_or_else`]
676 - [`std::rc::Weak::weak_count`]
677 - [`std::rc::Weak::strong_count`]
678 - [`std::sync::Weak::weak_count`]
679 - [`std::sync::Weak::strong_count`]
684 - [Cargo will now document all the private items for binary crates
685 by default.][cargo/7593]
686 - [`cargo-install` will now reinstall the package if it detects that it is out
687 of date.][cargo/7560]
688 - [Cargo.lock now uses a more git friendly format that should help to reduce
689 merge conflicts.][cargo/7579]
690 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
691 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
692 optimisation level to `2` for debug builds. You can also use
693 `[profile.<profile>.build-override]` to override build scripts and
699 - [You can now specify `edition` in documentation code blocks to compile the block
700 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
701 should be compiled the 2018 edition of Rust.
702 - [You can now provide custom themes to rustdoc with `--theme`, and check the
703 current theme with `--check-theme`.][54733]
704 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
709 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
710 Apple targets.][apple-32bit-drop] This means that the source code is still
711 available to build, but the targets are no longer being tested and release
712 binaries for those platforms will no longer be distributed by the Rust project.
713 Please refer to the linked blog post for more information.
715 [54733]: https://github.com/rust-lang/rust/pull/54733/
716 [61351]: https://github.com/rust-lang/rust/pull/61351/
717 [67255]: https://github.com/rust-lang/rust/pull/67255/
718 [66661]: https://github.com/rust-lang/rust/pull/66661/
719 [66771]: https://github.com/rust-lang/rust/pull/66771/
720 [66847]: https://github.com/rust-lang/rust/pull/66847/
721 [66238]: https://github.com/rust-lang/rust/pull/66238/
722 [66277]: https://github.com/rust-lang/rust/pull/66277/
723 [66325]: https://github.com/rust-lang/rust/pull/66325/
724 [66172]: https://github.com/rust-lang/rust/pull/66172/
725 [66183]: https://github.com/rust-lang/rust/pull/66183/
726 [65879]: https://github.com/rust-lang/rust/pull/65879/
727 [65013]: https://github.com/rust-lang/rust/pull/65013/
728 [64882]: https://github.com/rust-lang/rust/pull/64882/
729 [64325]: https://github.com/rust-lang/rust/pull/64325/
730 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
731 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
732 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
733 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
734 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
735 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
736 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
737 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
738 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
739 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
740 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
742 Version 1.40.0 (2019-12-19)
743 ===========================
747 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
748 `const` contexts.][65188] e.g.
751 pub struct Point(i32, i32);
753 const ORIGIN: Point = {
754 let constructor = Point;
760 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
761 indicate that there may be variants or fields added in the future.][64639]
762 For example this requires adding a wild-card branch (`_ => {}`) to any match
763 statements on a non-exhaustive `enum`. [(RFC 2008)]
764 - [You can now use function-like procedural macros in `extern` blocks and in
765 type positions.][63931] e.g. `type Generated = macro!();`
766 - [Function-like and attribute procedural macros can now emit
767 `macro_rules!` items, so you can now have your macros generate macros.][64035]
768 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
769 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
770 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
774 - [Added tier 3 support\* for the
775 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
776 - [Added tier 3 support for the
777 `aarch64-unknown-none-softfloat` target.][64589]
778 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
779 `mips64el-unknown-linux-muslabi64` targets.][65843]
781 \* Refer to Rust's [platform support page][forge-platform-support] for more
782 information on Rust's tiered platform support.
786 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
790 - [`BTreeMap::get_key_value`]
791 - [`HashMap::get_key_value`]
792 - [`Option::as_deref_mut`]
793 - [`Option::as_deref`]
794 - [`Option::flatten`]
795 - [`UdpSocket::peer_addr`]
796 - [`f32::to_be_bytes`]
797 - [`f32::to_le_bytes`]
798 - [`f32::to_ne_bytes`]
799 - [`f64::to_be_bytes`]
800 - [`f64::to_le_bytes`]
801 - [`f64::to_ne_bytes`]
802 - [`f32::from_be_bytes`]
803 - [`f32::from_le_bytes`]
804 - [`f32::from_ne_bytes`]
805 - [`f64::from_be_bytes`]
806 - [`f64::from_le_bytes`]
807 - [`f64::from_ne_bytes`]
814 - [Cargo will now always display warnings, rather than only on
815 fresh builds.][cargo/7450]
816 - [Feature flags (except `--all-features`) passed to a virtual workspace will
817 now produce an error.][cargo/7507] Previously these flags were ignored.
818 - [You can now publish `dev-dependencies` without including
819 a `version`.][cargo/7333]
823 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
824 when running documentation tests with `rustdoc`.][63803]
828 - [As previously announced, any previous NLL warnings in the 2015 edition are
829 now hard errors.][64221]
830 - [The `include!` macro will now warn if it failed to include the
831 entire file.][64284] The `include!` macro unintentionally only includes the
832 first _expression_ in a file, and this can be unintuitive. This will become
833 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
834 - [Using `#[inline]` on function prototypes and consts now emits a warning under
835 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
836 or `extern` blocks now correctly emits a hard error.
838 [65294]: https://github.com/rust-lang/rust/pull/65294/
839 [66103]: https://github.com/rust-lang/rust/pull/66103/
840 [65843]: https://github.com/rust-lang/rust/pull/65843/
841 [65188]: https://github.com/rust-lang/rust/pull/65188/
842 [65092]: https://github.com/rust-lang/rust/pull/65092/
843 [64589]: https://github.com/rust-lang/rust/pull/64589/
844 [64639]: https://github.com/rust-lang/rust/pull/64639/
845 [64221]: https://github.com/rust-lang/rust/pull/64221/
846 [64284]: https://github.com/rust-lang/rust/pull/64284/
847 [63931]: https://github.com/rust-lang/rust/pull/63931/
848 [64035]: https://github.com/rust-lang/rust/pull/64035/
849 [63674]: https://github.com/rust-lang/rust/pull/63674/
850 [63803]: https://github.com/rust-lang/rust/pull/63803/
851 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
852 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
853 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
854 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
855 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
856 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
857 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
858 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
859 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
860 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
861 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
862 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
863 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
864 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
865 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
866 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
867 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
868 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
869 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
870 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
871 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
872 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
873 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
874 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
875 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
876 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
879 Version 1.39.0 (2019-11-07)
880 ===========================
884 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
885 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
886 - [You can now use certain attributes on function, closure, and function pointer
887 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
888 `deny`, `forbid` as well as inert helper attributes used by procedural macro
889 attributes applied to items. e.g.
892 #[cfg(windows)] slice: &[u16],
893 #[cfg(not(windows))] slice: &[u8],
898 - [You can now take shared references to bind-by-move patterns in the `if` guards
899 of `match` arms.][63118] e.g.
902 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
906 // ---- `nums` is bound by move.
907 if nums.iter().sum::<u8>() == 10
908 // ^------ `.iter()` implicitly takes a reference to `nums`.
911 // ----------- Legal as `nums` was bound by move and so we have ownership.
922 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
923 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
924 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
925 **Note** Cargo currently doesn't use this feature. Refer to
926 [cargo#7315][cargo/7315] to track this feature's progress.
927 - [You can now pass `--show-output` argument to test binaries to print the
928 output of successful tests.][62600]
931 \* Refer to Rust's [platform support page][forge-platform-support] for more
932 information on Rust's tiered platform support.
936 - [`Vec::new` and `String::new` are now `const` functions.][64028]
937 - [`LinkedList::new` is now a `const` function.][63684]
938 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
939 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
944 - [`Pin::into_inner`]
945 - [`Instant::checked_duration_since`]
946 - [`Instant::saturating_duration_since`]
950 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
951 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
952 `--all` is now deprecated.
956 - [You can now pass `-Clinker` to rustdoc to control the linker used
957 for compiling doctests.][63834]
961 - [Code that was previously accepted by the old borrow checker, but rejected by
962 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
963 previously a warning, and will also become a hard error in the Rust 2015
964 edition in the 1.40.0 release.
965 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
966 run tests.][63827] This should improve performance when running a large
968 - [The `try!` macro will now issue a deprecation warning.][62672] It is
969 recommended to use the `?` operator instead.
970 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
973 [62600]: https://github.com/rust-lang/rust/pull/62600/
974 [62672]: https://github.com/rust-lang/rust/pull/62672/
975 [63118]: https://github.com/rust-lang/rust/pull/63118/
976 [63209]: https://github.com/rust-lang/rust/pull/63209/
977 [63402]: https://github.com/rust-lang/rust/pull/63402/
978 [63565]: https://github.com/rust-lang/rust/pull/63565/
979 [63595]: https://github.com/rust-lang/rust/pull/63595/
980 [63684]: https://github.com/rust-lang/rust/pull/63684/
981 [63698]: https://github.com/rust-lang/rust/pull/63698/
982 [63770]: https://github.com/rust-lang/rust/pull/63770/
983 [63786]: https://github.com/rust-lang/rust/pull/63786/
984 [63827]: https://github.com/rust-lang/rust/pull/63827/
985 [63834]: https://github.com/rust-lang/rust/pull/63834/
986 [63927]: https://github.com/rust-lang/rust/pull/63927/
987 [63933]: https://github.com/rust-lang/rust/pull/63933/
988 [63934]: https://github.com/rust-lang/rust/pull/63934/
989 [63938]: https://github.com/rust-lang/rust/pull/63938/
990 [63940]: https://github.com/rust-lang/rust/pull/63940/
991 [63941]: https://github.com/rust-lang/rust/pull/63941/
992 [63945]: https://github.com/rust-lang/rust/pull/63945/
993 [64010]: https://github.com/rust-lang/rust/pull/64010/
994 [64028]: https://github.com/rust-lang/rust/pull/64028/
995 [64334]: https://github.com/rust-lang/rust/pull/64334/
996 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
997 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
998 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
999 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1000 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1001 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1003 Version 1.38.0 (2019-09-26)
1004 ==========================
1008 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1009 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1013 - [Added pipelined compilation support to `rustc`.][62766] This will
1014 improve compilation times in some cases. For further information please refer
1015 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1016 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1017 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1018 `x86_64-uwp-windows-msvc` targets.][60260]
1019 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1020 `armv7-unknown-linux-musleabi` targets.][63107]
1021 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1022 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1024 \* Refer to Rust's [platform support page][forge-platform-support] for more
1025 information on Rust's tiered platform support.
1029 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1030 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1031 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1032 is available at `std::clone::Clone`). This also makes all built-in macros
1033 available in `std`/`core` root. e.g. `std::include_bytes!`.
1034 - [`str::Chars` now implements `Debug`.][63000]
1035 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1036 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1037 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1038 - [Added euclidean remainder and division operations (`div_euclid`,
1039 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1040 `overflowing`, and `wrapping` versions are available for all
1042 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1043 `PartialEq`.][61491]
1044 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1048 - [`<*const T>::cast`]
1049 - [`<*mut T>::cast`]
1050 - [`Duration::as_secs_f32`]
1051 - [`Duration::as_secs_f64`]
1052 - [`Duration::div_f32`]
1053 - [`Duration::div_f64`]
1054 - [`Duration::from_secs_f32`]
1055 - [`Duration::from_secs_f64`]
1056 - [`Duration::mul_f32`]
1057 - [`Duration::mul_f64`]
1058 - [`any::type_name`]
1062 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1063 - [You can now pass the `--features` option multiple times to enable
1064 multiple features.][cargo/7084]
1068 - [`rustc` will now warn about some incorrect uses of
1069 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1073 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1075 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1076 issues][62896] with certain crates such as libc.
1078 [60260]: https://github.com/rust-lang/rust/pull/60260/
1079 [61457]: https://github.com/rust-lang/rust/pull/61457/
1080 [61491]: https://github.com/rust-lang/rust/pull/61491/
1081 [61884]: https://github.com/rust-lang/rust/pull/61884/
1082 [61953]: https://github.com/rust-lang/rust/pull/61953/
1083 [62042]: https://github.com/rust-lang/rust/pull/62042/
1084 [62528]: https://github.com/rust-lang/rust/pull/62528/
1085 [62583]: https://github.com/rust-lang/rust/pull/62583/
1086 [62735]: https://github.com/rust-lang/rust/pull/62735/
1087 [62766]: https://github.com/rust-lang/rust/pull/62766/
1088 [62784]: https://github.com/rust-lang/rust/pull/62784/
1089 [62785]: https://github.com/rust-lang/rust/issues/62785/
1090 [62814]: https://github.com/rust-lang/rust/pull/62814/
1091 [62896]: https://github.com/rust-lang/rust/issues/62896/
1092 [63000]: https://github.com/rust-lang/rust/pull/63000/
1093 [63056]: https://github.com/rust-lang/rust/pull/63056/
1094 [63107]: https://github.com/rust-lang/rust/pull/63107/
1095 [63346]: https://github.com/rust-lang/rust/pull/63346/
1096 [63421]: https://github.com/rust-lang/rust/pull/63421/
1097 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1098 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1099 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1100 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1101 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1102 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1103 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1104 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1105 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1106 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1107 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1108 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1109 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1110 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1111 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1113 Version 1.37.0 (2019-08-15)
1114 ==========================
1118 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1119 [`Box`][62228], or an [array][62235] and unused.
1120 - [You can now use the `cfg` and `cfg_attr` attributes on
1121 generic parameters.][61547]
1122 - [You can now use enum variants through type alias.][61682] e.g. You can
1123 write the following:
1125 type MyOption = Option<u8>;
1127 fn increment_or_zero(x: MyOption) -> u8 {
1129 MyOption::Some(y) => y + 1,
1130 MyOption::None => 0,
1134 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1135 `const _: u32 = 5;`.
1136 - [You can now use `#[repr(align(X)]` on enums.][61229]
1137 - [The `?` Kleene macro operator is now available in the
1138 2015 edition.][60932]
1142 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1143 and `-C profile-use` flags.][61268] For more information on how to use profile
1144 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1145 - [The `rust-lldb` wrapper script should now work again.][61827]
1149 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1153 - [`BufReader::buffer`]
1154 - [`BufWriter::buffer`]
1155 - [`Cell::from_mut`]
1156 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1157 - [`DoubleEndedIterator::nth_back`]
1159 - [`Wrapping::reverse_bits`]
1160 - [`i128::reverse_bits`]
1161 - [`i16::reverse_bits`]
1162 - [`i32::reverse_bits`]
1163 - [`i64::reverse_bits`]
1164 - [`i8::reverse_bits`]
1165 - [`isize::reverse_bits`]
1166 - [`slice::copy_within`]
1167 - [`u128::reverse_bits`]
1168 - [`u16::reverse_bits`]
1169 - [`u32::reverse_bits`]
1170 - [`u64::reverse_bits`]
1171 - [`u8::reverse_bits`]
1172 - [`usize::reverse_bits`]
1176 - [`Cargo.lock` files are now included by default when publishing executable crates
1177 with executables.][cargo/7026]
1178 - [You can now specify `default-run="foo"` in `[package]` to specify the
1179 default executable to use for `cargo run`.][cargo/7056]
1186 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1187 Please transition your code to using the `..=` syntax for inclusive
1189 - [Using a trait object without the `dyn` will now warn by default.][61203]
1190 Please transition your code to use `dyn Trait` for trait objects instead.
1192 [62228]: https://github.com/rust-lang/rust/pull/62228/
1193 [62235]: https://github.com/rust-lang/rust/pull/62235/
1194 [61802]: https://github.com/rust-lang/rust/pull/61802/
1195 [61827]: https://github.com/rust-lang/rust/pull/61827/
1196 [61547]: https://github.com/rust-lang/rust/pull/61547/
1197 [61682]: https://github.com/rust-lang/rust/pull/61682/
1198 [61268]: https://github.com/rust-lang/rust/pull/61268/
1199 [61342]: https://github.com/rust-lang/rust/pull/61342/
1200 [61347]: https://github.com/rust-lang/rust/pull/61347/
1201 [61100]: https://github.com/rust-lang/rust/pull/61100/
1202 [61203]: https://github.com/rust-lang/rust/pull/61203/
1203 [61229]: https://github.com/rust-lang/rust/pull/61229/
1204 [60932]: https://github.com/rust-lang/rust/pull/60932/
1205 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1206 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1207 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1208 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1209 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1210 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1211 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1212 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1213 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1214 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1215 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1216 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1217 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1218 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1219 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1220 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1221 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1222 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1223 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1224 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1225 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1226 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1227 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1228 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1231 Version 1.36.0 (2019-07-04)
1232 ==========================
1236 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1237 - [The order of traits in trait objects no longer affects the semantics of that
1238 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1239 `dyn fmt::Debug + Send`, where this was previously not the case.
1243 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1244 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1245 - [`mem::needs_drop` is now available as a const fn.][60364]
1246 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1247 - [`String` now implements `BorrowMut<str>`.][60404]
1248 - [`io::Cursor` now implements `Default`.][60234]
1249 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1250 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1251 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1252 environment has access to heap memory allocation.
1253 - [`String` now implements `From<&String>`.][59825]
1254 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1255 return a tuple of each argument when there is multiple arguments.
1256 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1261 - [`VecDeque::rotate_left`]
1262 - [`VecDeque::rotate_right`]
1263 - [`Iterator::copied`]
1265 - [`io::IoSliceMut`]
1266 - [`Read::read_vectored`]
1267 - [`Write::write_vectored`]
1268 - [`str::as_mut_ptr`]
1269 - [`mem::MaybeUninit`]
1270 - [`pointer::align_offset`]
1271 - [`future::Future`]
1273 - [`task::RawWaker`]
1274 - [`task::RawWakerVTable`]
1280 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1281 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1283 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1287 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1294 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1295 longer recommended, and will be deprecated in 1.39.0.
1297 [60318]: https://github.com/rust-lang/rust/pull/60318/
1298 [60364]: https://github.com/rust-lang/rust/pull/60364/
1299 [60370]: https://github.com/rust-lang/rust/pull/60370/
1300 [60404]: https://github.com/rust-lang/rust/pull/60404/
1301 [60234]: https://github.com/rust-lang/rust/pull/60234/
1302 [60244]: https://github.com/rust-lang/rust/pull/60244/
1303 [58623]: https://github.com/rust-lang/rust/pull/58623/
1304 [59648]: https://github.com/rust-lang/rust/pull/59648/
1305 [59675]: https://github.com/rust-lang/rust/pull/59675/
1306 [59825]: https://github.com/rust-lang/rust/pull/59825/
1307 [59826]: https://github.com/rust-lang/rust/pull/59826/
1308 [59445]: https://github.com/rust-lang/rust/pull/59445/
1309 [59114]: https://github.com/rust-lang/rust/pull/59114/
1310 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1311 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1312 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1313 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1314 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1315 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1316 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1317 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1318 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1319 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1320 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1321 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1322 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1323 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1324 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1325 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1326 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1327 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1328 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1329 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1332 Version 1.35.0 (2019-05-23)
1333 ==========================
1337 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1338 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1339 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1341 unsafe fn call_unsafe(func: unsafe fn()) {
1346 unsafe { call_unsafe(|| {}); }
1353 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1354 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1355 - [Added the `wasm32-unknown-wasi` target.][59464]
1360 - [`Thread` will now show its ID in `Debug` output.][59460]
1361 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1362 - [`alloc::System` now implements `Default`.][59451]
1363 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1365 - [`char::{ToLowercase, ToUppercase}` now
1366 implement `ExactSizeIterator`.][58778]
1367 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1368 - [Removed the `Read` trait bounds
1369 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1370 - [You can now call the `dbg!` macro without any parameters to print the file
1371 and line where it is called.][57847]
1372 - [In place ASCII case conversions are now up to 4× faster.][59283]
1373 e.g. `str::make_ascii_lowercase`
1374 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1381 - [`RefCell::replace_with`]
1382 - [`RefCell::map_split`]
1384 - [`Range::contains`]
1385 - [`RangeFrom::contains`]
1386 - [`RangeTo::contains`]
1387 - [`RangeInclusive::contains`]
1388 - [`RangeToInclusive::contains`]
1389 - [`Option::copied`]
1393 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1394 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1399 - [The Rust toolchain is now available natively for musl based distros.][58575]
1401 [59460]: https://github.com/rust-lang/rust/pull/59460/
1402 [59464]: https://github.com/rust-lang/rust/pull/59464/
1403 [59500]: https://github.com/rust-lang/rust/pull/59500/
1404 [59512]: https://github.com/rust-lang/rust/pull/59512/
1405 [59580]: https://github.com/rust-lang/rust/pull/59580/
1406 [59283]: https://github.com/rust-lang/rust/pull/59283/
1407 [59451]: https://github.com/rust-lang/rust/pull/59451/
1408 [59076]: https://github.com/rust-lang/rust/pull/59076/
1409 [58778]: https://github.com/rust-lang/rust/pull/58778/
1410 [58717]: https://github.com/rust-lang/rust/pull/58717/
1411 [58369]: https://github.com/rust-lang/rust/pull/58369/
1412 [58423]: https://github.com/rust-lang/rust/pull/58423/
1413 [58080]: https://github.com/rust-lang/rust/pull/58080/
1414 [57847]: https://github.com/rust-lang/rust/pull/57847/
1415 [58575]: https://github.com/rust-lang/rust/pull/58575
1416 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1417 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1418 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1419 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1420 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1421 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1422 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1423 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1424 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1425 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1426 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1427 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1429 Version 1.34.2 (2019-05-14)
1430 ===========================
1432 * [Destabilize the `Error::type_id` function due to a security
1433 vulnerability][60785] ([CVE-2019-12083])
1435 [60785]: https://github.com/rust-lang/rust/pull/60785
1436 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1438 Version 1.34.1 (2019-04-25)
1439 ===========================
1441 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1442 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1443 * [Fix Clippy panic when checking some macros][clippy/3805]
1445 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1446 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1447 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1449 Version 1.34.0 (2019-04-11)
1450 ==========================
1454 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1455 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1457 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1458 `#[attr{}]` procedural macros.][57367]
1459 - [You can now write `extern crate self as foo;`][57407] to import your
1460 crate's root into the extern prelude.
1465 - [You can now target `riscv64imac-unknown-none-elf` and
1466 `riscv64gc-unknown-none-elf`.][58406]
1467 - [You can now enable linker plugin LTO optimisations with
1468 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1469 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1471 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1476 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1477 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1478 the `Hash` trait to create an iterator.
1479 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1480 methods.][58421] Most notably you no longer require the `Ord` trait to create
1482 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1483 for all numeric types.][58044]
1484 - [Indexing a `str` is now generic over all types that
1485 implement `SliceIndex<str>`.][57604]
1486 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1487 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1488 produce a warning if their returning type is unused.
1489 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1490 `overflowing_pow` are now available for all numeric types.][57873] These are
1491 equivalent to methods such as `wrapping_add` for the `pow` operation.
1499 * [`Error::type_id`]
1500 * [`atomic::AtomicI16`]
1501 * [`atomic::AtomicI32`]
1502 * [`atomic::AtomicI64`]
1503 * [`atomic::AtomicI8`]
1504 * [`atomic::AtomicU16`]
1505 * [`atomic::AtomicU32`]
1506 * [`atomic::AtomicU64`]
1507 * [`atomic::AtomicU8`]
1508 * [`convert::Infallible`]
1509 * [`convert::TryFrom`]
1510 * [`convert::TryInto`]
1512 * [`iter::successors`]
1513 * [`num::NonZeroI128`]
1514 * [`num::NonZeroI16`]
1515 * [`num::NonZeroI32`]
1516 * [`num::NonZeroI64`]
1517 * [`num::NonZeroI8`]
1518 * [`num::NonZeroIsize`]
1519 * [`slice::sort_by_cached_key`]
1520 * [`str::escape_debug`]
1521 * [`str::escape_default`]
1522 * [`str::escape_unicode`]
1523 * [`str::split_ascii_whitespace`]
1526 * [`Instant::checked_add`]
1527 * [`Instant::checked_sub`]
1528 * [`SystemTime::checked_add`]
1529 * [`SystemTime::checked_sub`]
1533 - [You can now use alternative registries to crates.io.][cargo/6654]
1537 - [You can now use the `?` operator in your documentation tests without manually
1538 adding `fn main() -> Result<(), _> {}`.][56470]
1542 - [`Command::before_exec` is being replaced by the unsafe method
1543 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1544 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1545 can now use `const` functions in `static` variables.
1547 [58370]: https://github.com/rust-lang/rust/pull/58370/
1548 [58406]: https://github.com/rust-lang/rust/pull/58406/
1549 [58421]: https://github.com/rust-lang/rust/pull/58421/
1550 [58166]: https://github.com/rust-lang/rust/pull/58166/
1551 [58044]: https://github.com/rust-lang/rust/pull/58044/
1552 [58057]: https://github.com/rust-lang/rust/pull/58057/
1553 [58059]: https://github.com/rust-lang/rust/pull/58059/
1554 [57809]: https://github.com/rust-lang/rust/pull/57809/
1555 [57873]: https://github.com/rust-lang/rust/pull/57873/
1556 [57604]: https://github.com/rust-lang/rust/pull/57604/
1557 [57367]: https://github.com/rust-lang/rust/pull/57367/
1558 [57407]: https://github.com/rust-lang/rust/pull/57407/
1559 [57425]: https://github.com/rust-lang/rust/pull/57425/
1560 [57106]: https://github.com/rust-lang/rust/pull/57106/
1561 [56470]: https://github.com/rust-lang/rust/pull/56470/
1562 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1563 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1564 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1565 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1566 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1567 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1568 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1569 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1570 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1571 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1572 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1573 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1574 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1575 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1576 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1577 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1578 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1579 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1580 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1581 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1582 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1583 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1584 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1585 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1586 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1587 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1588 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1589 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1590 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1591 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1592 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1595 Version 1.33.0 (2019-02-28)
1596 ==========================
1600 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1601 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1602 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1603 E.g. You can have match statement on a `u8` that covers `0..=255` and
1604 you would no longer be required to have a `_ => unreachable!()` case.
1605 - [You can now have multiple patterns in `if let` and `while let`
1606 expressions.][57532] You can do this with the same syntax as a `match`
1616 let state = Creature::Crab("Ferris");
1618 if let Creature::Crab(name) | Creature::Person(name) = state {
1619 println!("This creature's name is: {}", name);
1623 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1624 this feature will by default produce a warning as this behaviour can be
1625 unintuitive. E.g. `if let _ = 5 {}`
1626 - [You can now use `let` bindings, assignments, expression statements,
1627 and irrefutable pattern destructuring in const functions.][57175]
1628 - [You can now call unsafe const functions.][57067] E.g.
1630 const unsafe fn foo() -> i32 { 5 }
1631 const fn bar() -> i32 {
1635 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1636 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1637 - [You can now specify a specific alignment with the `#[repr(packed)]`
1638 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1639 with an alignment of 2 bytes and a size of 6 bytes.
1640 - [You can now import an item from a module as an `_`.][56303] This allows you to
1641 import a trait's impls, and not have the name in the namespace. E.g.
1643 use std::io::Read as _;
1645 // Allowed as there is only one `Read` in the module.
1648 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1652 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1653 command line argument.][56351]
1654 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1655 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1656 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1657 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1658 information on Rust's platform support.
1659 - [Added support for the `thumbv7neon-linux-androideabi` and
1660 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1661 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1665 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1666 functions for all numeric types.][57566]
1667 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1668 are now `const` functions for all numeric types.][57105]
1669 - [The methods `is_positive` and `is_negative` are now `const` functions for
1670 all signed numeric types.][57105]
1671 - [The `get` method for all `NonZero` types is now `const`.][57167]
1672 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1673 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1674 numeric types.][57234]
1675 - [`Ipv4Addr::new` is now a `const` function][57234]
1679 - [`unix::FileExt::read_exact_at`]
1680 - [`unix::FileExt::write_all_at`]
1681 - [`Option::transpose`]
1682 - [`Result::transpose`]
1683 - [`convert::identity`]
1686 - [`marker::PhantomPinned`]
1687 - [`Vec::resize_with`]
1688 - [`VecDeque::resize_with`]
1689 - [`Duration::as_millis`]
1690 - [`Duration::as_micros`]
1691 - [`Duration::as_nanos`]
1696 - [You can now publish crates that require a feature flag to compile with
1697 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1698 - [Cargo should now rebuild a crate if a file was modified during the initial
1703 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1704 are now deprecated in the standard library, and their usage will now produce a warning.
1705 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1707 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1709 - [Libtest no longer creates a new thread for each test when
1710 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1712 [55982]: https://github.com/rust-lang/rust/pull/55982/
1713 [56243]: https://github.com/rust-lang/rust/pull/56243
1714 [56303]: https://github.com/rust-lang/rust/pull/56303/
1715 [56351]: https://github.com/rust-lang/rust/pull/56351/
1716 [56362]: https://github.com/rust-lang/rust/pull/56362
1717 [56642]: https://github.com/rust-lang/rust/pull/56642/
1718 [56769]: https://github.com/rust-lang/rust/pull/56769/
1719 [56805]: https://github.com/rust-lang/rust/pull/56805
1720 [56947]: https://github.com/rust-lang/rust/pull/56947/
1721 [57049]: https://github.com/rust-lang/rust/pull/57049/
1722 [57067]: https://github.com/rust-lang/rust/pull/57067/
1723 [57105]: https://github.com/rust-lang/rust/pull/57105
1724 [57130]: https://github.com/rust-lang/rust/pull/57130/
1725 [57167]: https://github.com/rust-lang/rust/pull/57167/
1726 [57175]: https://github.com/rust-lang/rust/pull/57175/
1727 [57234]: https://github.com/rust-lang/rust/pull/57234/
1728 [57332]: https://github.com/rust-lang/rust/pull/57332/
1729 [57465]: https://github.com/rust-lang/rust/pull/57465/
1730 [57532]: https://github.com/rust-lang/rust/pull/57532/
1731 [57535]: https://github.com/rust-lang/rust/pull/57535/
1732 [57566]: https://github.com/rust-lang/rust/pull/57566/
1733 [57615]: https://github.com/rust-lang/rust/pull/57615/
1734 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1735 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1736 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1737 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1738 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1739 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1740 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1741 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1742 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1743 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1744 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1745 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1746 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1747 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1748 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1749 [platform-support]: https://forge.rust-lang.org/platform-support.html
1751 Version 1.32.0 (2019-01-17)
1752 ==========================
1757 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1758 operator allows you to specify zero or one repetitions similar to the `*` and
1760 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1761 now always resolve to the item (`enum`, `struct`, etc.) available in the
1762 module if present, before resolving to a external crate or an item the prelude.][56759]
1765 enum Color { Red, Green, Blue }
1771 - [You can now match against `PhantomData<T>` types.][55837]
1772 - [You can now match against literals in macros with the `literal`
1773 specifier.][56072] This will match against a literal of any type.
1774 E.g. `1`, `'A'`, `"Hello World"`
1775 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1777 struct Point(i32, i32);
1780 pub fn new(x: i32, y: i32) -> Self {
1784 pub fn is_origin(&self) -> bool {
1792 - [Self can also now be used in type definitions.][56366] E.g.
1796 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1799 Cons(T, Box<Self>) // likewise here
1802 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1803 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1807 - [The default allocator has changed from jemalloc to the default allocator on
1808 your system.][55238] The compiler itself on Linux & macOS will still use
1809 jemalloc, but programs compiled with it will use the system allocator.
1810 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1814 - [`PathBuf` now implements `FromStr`.][55148]
1815 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1816 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1817 easily debug expressions in your rust program. E.g.
1820 let b = dbg!(a * 2) + 1;
1821 // ^-- prints: [src/main.rs:4] a * 2 = 4
1825 The following APIs are now `const` functions and can be used in a
1829 - [`UnsafeCell::get`]
1830 - [`char::is_ascii`]
1832 - [`ManuallyDrop::new`]
1833 - [`ManuallyDrop::into_inner`]
1834 - [`RangeInclusive::start`]
1835 - [`RangeInclusive::end`]
1836 - [`NonNull::as_ptr`]
1839 - [`Duration::as_secs`]
1840 - [`Duration::subsec_millis`]
1841 - [`Duration::subsec_micros`]
1842 - [`Duration::subsec_nanos`]
1844 - [`Ipv4Addr::is_unspecified`]
1846 - [`Ipv6Addr::octets`]
1850 - [`i8::to_be_bytes`]
1851 - [`i8::to_le_bytes`]
1852 - [`i8::to_ne_bytes`]
1853 - [`i8::from_be_bytes`]
1854 - [`i8::from_le_bytes`]
1855 - [`i8::from_ne_bytes`]
1856 - [`i16::to_be_bytes`]
1857 - [`i16::to_le_bytes`]
1858 - [`i16::to_ne_bytes`]
1859 - [`i16::from_be_bytes`]
1860 - [`i16::from_le_bytes`]
1861 - [`i16::from_ne_bytes`]
1862 - [`i32::to_be_bytes`]
1863 - [`i32::to_le_bytes`]
1864 - [`i32::to_ne_bytes`]
1865 - [`i32::from_be_bytes`]
1866 - [`i32::from_le_bytes`]
1867 - [`i32::from_ne_bytes`]
1868 - [`i64::to_be_bytes`]
1869 - [`i64::to_le_bytes`]
1870 - [`i64::to_ne_bytes`]
1871 - [`i64::from_be_bytes`]
1872 - [`i64::from_le_bytes`]
1873 - [`i64::from_ne_bytes`]
1874 - [`i128::to_be_bytes`]
1875 - [`i128::to_le_bytes`]
1876 - [`i128::to_ne_bytes`]
1877 - [`i128::from_be_bytes`]
1878 - [`i128::from_le_bytes`]
1879 - [`i128::from_ne_bytes`]
1880 - [`isize::to_be_bytes`]
1881 - [`isize::to_le_bytes`]
1882 - [`isize::to_ne_bytes`]
1883 - [`isize::from_be_bytes`]
1884 - [`isize::from_le_bytes`]
1885 - [`isize::from_ne_bytes`]
1886 - [`u8::to_be_bytes`]
1887 - [`u8::to_le_bytes`]
1888 - [`u8::to_ne_bytes`]
1889 - [`u8::from_be_bytes`]
1890 - [`u8::from_le_bytes`]
1891 - [`u8::from_ne_bytes`]
1892 - [`u16::to_be_bytes`]
1893 - [`u16::to_le_bytes`]
1894 - [`u16::to_ne_bytes`]
1895 - [`u16::from_be_bytes`]
1896 - [`u16::from_le_bytes`]
1897 - [`u16::from_ne_bytes`]
1898 - [`u32::to_be_bytes`]
1899 - [`u32::to_le_bytes`]
1900 - [`u32::to_ne_bytes`]
1901 - [`u32::from_be_bytes`]
1902 - [`u32::from_le_bytes`]
1903 - [`u32::from_ne_bytes`]
1904 - [`u64::to_be_bytes`]
1905 - [`u64::to_le_bytes`]
1906 - [`u64::to_ne_bytes`]
1907 - [`u64::from_be_bytes`]
1908 - [`u64::from_le_bytes`]
1909 - [`u64::from_ne_bytes`]
1910 - [`u128::to_be_bytes`]
1911 - [`u128::to_le_bytes`]
1912 - [`u128::to_ne_bytes`]
1913 - [`u128::from_be_bytes`]
1914 - [`u128::from_le_bytes`]
1915 - [`u128::from_ne_bytes`]
1916 - [`usize::to_be_bytes`]
1917 - [`usize::to_le_bytes`]
1918 - [`usize::to_ne_bytes`]
1919 - [`usize::from_be_bytes`]
1920 - [`usize::from_le_bytes`]
1921 - [`usize::from_ne_bytes`]
1925 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1926 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1930 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1934 - [The argument types for AVX's
1935 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1936 been changed from `*const` to `*mut` as the previous implementation
1940 [55148]: https://github.com/rust-lang/rust/pull/55148/
1941 [55238]: https://github.com/rust-lang/rust/pull/55238/
1942 [55280]: https://github.com/rust-lang/rust/pull/55280/
1943 [55610]: https://github.com/rust-lang/rust/pull/55610/
1944 [55663]: https://github.com/rust-lang/rust/pull/55663/
1945 [55702]: https://github.com/rust-lang/rust/pull/55702/
1946 [55837]: https://github.com/rust-lang/rust/pull/55837/
1947 [55843]: https://github.com/rust-lang/rust/pull/55843/
1948 [56072]: https://github.com/rust-lang/rust/pull/56072/
1949 [56245]: https://github.com/rust-lang/rust/pull/56245/
1950 [56365]: https://github.com/rust-lang/rust/pull/56365/
1951 [56366]: https://github.com/rust-lang/rust/pull/56366/
1952 [56395]: https://github.com/rust-lang/rust/pull/56395/
1953 [56759]: https://github.com/rust-lang/rust/pull/56759/
1954 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1955 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1956 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1957 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1958 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1959 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1960 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1961 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1962 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1963 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1964 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1965 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1966 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1967 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1968 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1969 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1970 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1971 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1972 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1973 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1974 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1975 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1976 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1977 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1978 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1979 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1980 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1981 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1982 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1983 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1984 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1985 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1986 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1987 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1988 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1989 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1990 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1991 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1992 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1993 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1994 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1995 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1996 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1997 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1998 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1999 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2000 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2001 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2002 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2003 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2004 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2005 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2006 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2007 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2008 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2009 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2010 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2011 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2012 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2013 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2014 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2015 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2016 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2017 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2018 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2019 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2020 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2021 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2022 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2023 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2024 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2025 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2026 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2027 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2028 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2029 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2030 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2031 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2032 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2033 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2034 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2035 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2036 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2037 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2038 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2039 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2040 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2041 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2042 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2043 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2044 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2045 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2046 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2049 Version 1.31.1 (2018-12-20)
2050 ===========================
2052 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2053 - [Fix broken go-to-definition in RLS][rls/1171]
2054 - [Fix infinite loop on hover in RLS][rls/1170]
2056 [56562]: https://github.com/rust-lang/rust/pull/56562
2057 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2058 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2060 Version 1.31.0 (2018-12-06)
2061 ==========================
2065 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2066 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2067 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2068 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2070 - [You can now define and use `const` functions.][54835] These are currently
2071 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2072 [language reference][const-reference] for what exactly is available.
2073 - [You can now use tool lints, which allow you to scope lints from external
2074 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2075 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2076 a crate, not just in exported functions.][54451]
2077 - [You can now use parentheses in pattern matches.][54497]
2081 - [Updated musl to 1.1.20][54430]
2085 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2086 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2087 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2088 into `Option<&mut T>` using the `From` trait.][53218]
2089 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2094 - [`slice::align_to`]
2095 - [`slice::align_to_mut`]
2096 - [`slice::chunks_exact`]
2097 - [`slice::chunks_exact_mut`]
2098 - [`slice::rchunks`]
2099 - [`slice::rchunks_mut`]
2100 - [`slice::rchunks_exact`]
2101 - [`slice::rchunks_exact_mut`]
2102 - [`Option::replace`]
2106 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2107 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2108 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2110 [52813]: https://github.com/rust-lang/rust/pull/52813/
2111 [53218]: https://github.com/rust-lang/rust/pull/53218/
2112 [53555]: https://github.com/rust-lang/rust/issues/53555/
2113 [54057]: https://github.com/rust-lang/rust/pull/54057/
2114 [54240]: https://github.com/rust-lang/rust/pull/54240/
2115 [54430]: https://github.com/rust-lang/rust/pull/54430/
2116 [54451]: https://github.com/rust-lang/rust/pull/54451/
2117 [54497]: https://github.com/rust-lang/rust/pull/54497/
2118 [54778]: https://github.com/rust-lang/rust/pull/54778/
2119 [54835]: https://github.com/rust-lang/rust/pull/54835/
2120 [54870]: https://github.com/rust-lang/rust/pull/54870/
2121 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2122 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2123 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2124 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2125 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2126 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2127 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2128 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2129 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2130 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2131 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2132 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2133 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2134 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2136 Version 1.30.1 (2018-11-08)
2137 ===========================
2139 - [Fixed overflow ICE in rustdoc][54199]
2140 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2142 [54199]: https://github.com/rust-lang/rust/pull/54199
2143 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2145 Version 1.30.0 (2018-10-25)
2146 ==========================
2150 - [Procedural macros are now available.][52081] These kinds of macros allow for
2151 more powerful code generation. There is a [new chapter available][proc-macros]
2152 in the Rust Programming Language book that goes further in depth.
2153 - [You can now use keywords as identifiers using the raw identifiers
2154 syntax (`r#`),][53236] e.g. `let r#for = true;`
2155 - [Using anonymous parameters in traits is now deprecated with a warning and
2156 will be a hard error in the 2018 edition.][53272]
2157 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2158 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2159 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2160 Previously, using a external crate in a module without a use statement
2161 required `let json = ::serde_json::from_str(foo);` but can now be written
2162 as `let json = serde_json::from_str(foo);`.
2163 - [You can now apply the `#[used]` attribute to static items to prevent the
2164 compiler from optimising them away, even if they appear to be unused,][51363]
2165 e.g. `#[used] static FOO: u32 = 1;`
2166 - [You can now import and reexport macros from other crates with the `use`
2167 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2168 the root module of the crate. If your macro relies on calling other local
2169 macros, it is recommended to export with the
2170 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2172 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2173 using the `vis` specifier.][53370]
2174 - [Non-macro attributes now allow all forms of literals, not just
2175 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2176 write `#[attr(true)]`.
2177 - [You can now specify a function to handle a panic in the Rust runtime with the
2178 `#[panic_handler]` attribute.][51366]
2182 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2183 - [Added the `aarch64-unknown-netbsd` target][53165]
2187 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2191 - [`Ipv4Addr::BROADCAST`]
2192 - [`Ipv4Addr::LOCALHOST`]
2193 - [`Ipv4Addr::UNSPECIFIED`]
2194 - [`Ipv6Addr::LOCALHOST`]
2195 - [`Ipv6Addr::UNSPECIFIED`]
2196 - [`Iterator::find_map`]
2198 The following methods are replacement methods for `trim_left`, `trim_right`,
2199 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2201 - [`str::trim_end_matches`]
2203 - [`str::trim_start_matches`]
2204 - [`str::trim_start`]
2208 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2209 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2210 equivalent to calling `rustdoc --error-format=json`.
2211 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2215 - [`rustdoc` allows you to specify what edition to treat your code as with the
2216 `--edition` option.][54057]
2217 - [`rustdoc` now has the `--color` (specify whether to output color) and
2218 `--error-format` (specify error format, e.g. `json`) options.][53003]
2219 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2220 debug symbols.][53774]
2221 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2222 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2224 [50911]: https://github.com/rust-lang/rust/pull/50911/
2225 [51363]: https://github.com/rust-lang/rust/pull/51363/
2226 [51366]: https://github.com/rust-lang/rust/pull/51366/
2227 [52081]: https://github.com/rust-lang/rust/pull/52081/
2228 [53003]: https://github.com/rust-lang/rust/pull/53003/
2229 [53033]: https://github.com/rust-lang/rust/pull/53033/
2230 [53044]: https://github.com/rust-lang/rust/pull/53044/
2231 [53165]: https://github.com/rust-lang/rust/pull/53165/
2232 [53213]: https://github.com/rust-lang/rust/pull/53213/
2233 [53236]: https://github.com/rust-lang/rust/pull/53236/
2234 [53272]: https://github.com/rust-lang/rust/pull/53272/
2235 [53370]: https://github.com/rust-lang/rust/pull/53370/
2236 [53459]: https://github.com/rust-lang/rust/pull/53459/
2237 [53774]: https://github.com/rust-lang/rust/pull/53774/
2238 [53822]: https://github.com/rust-lang/rust/pull/53822/
2239 [54057]: https://github.com/rust-lang/rust/pull/54057/
2240 [54146]: https://github.com/rust-lang/rust/pull/54146/
2241 [54404]: https://github.com/rust-lang/rust/pull/54404/
2242 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2243 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2244 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2245 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2247 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2248 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2249 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2250 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2251 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2252 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2253 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2254 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2255 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2256 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2259 Version 1.29.2 (2018-10-11)
2260 ===========================
2262 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2263 - The `rls-preview` component on the windows-gnu targets has been restored.
2265 [54639]: https://github.com/rust-lang/rust/pull/54639
2268 Version 1.29.1 (2018-09-25)
2269 ===========================
2274 - The standard library's `str::repeat` function contained an out of bounds write
2275 caused by an integer overflow. This has been fixed by deterministically
2276 panicking when an overflow happens.
2278 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2282 Version 1.29.0 (2018-09-13)
2283 ==========================
2287 - [Bumped minimum LLVM version to 5.0.][51899]
2288 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2289 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2293 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2294 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2295 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2296 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2298 - [`Cell<T>` now allows `T` to be unsized.][50494]
2299 - [`SocketAddr` is now stable on Redox.][52656]
2304 - [`Iterator::flatten`]
2309 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2310 `--locked` to disable this behavior.
2311 - [`cargo-install` will now allow you to cross compile an install
2312 using `--target`.][cargo/5614]
2313 - [Added the `cargo-fix` subcommand to automatically move project code from
2314 2015 edition to 2018.][cargo/5723]
2315 - [`cargo doc` can now optionally document private types using the
2316 `--document-private-items` flag.][cargo/5543]
2320 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2321 the specified level to that level.][52354] For example `--cap-lints warn`
2322 will demote `deny` and `forbid` lints to `warn`.
2323 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2324 fails and `101` if there is a panic.][52197]
2325 - [A preview of clippy has been made available through rustup.][51122]
2326 You can install the preview with `rustup component add clippy-preview`.
2330 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2331 Use `str::get_unchecked(begin..end)` instead.
2332 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2333 Consider using the `home_dir` function from
2334 https://crates.io/crates/dirs instead.
2335 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2336 - [`cfg` attributes and `--cfg` command line flags are now more
2337 strictly validated.][53893]
2339 [53893]: https://github.com/rust-lang/rust/pull/53893/
2340 [52861]: https://github.com/rust-lang/rust/pull/52861/
2341 [52656]: https://github.com/rust-lang/rust/pull/52656/
2342 [52239]: https://github.com/rust-lang/rust/pull/52239/
2343 [52330]: https://github.com/rust-lang/rust/pull/52330/
2344 [52354]: https://github.com/rust-lang/rust/pull/52354/
2345 [52402]: https://github.com/rust-lang/rust/pull/52402/
2346 [52103]: https://github.com/rust-lang/rust/pull/52103/
2347 [52197]: https://github.com/rust-lang/rust/pull/52197/
2348 [51807]: https://github.com/rust-lang/rust/pull/51807/
2349 [51899]: https://github.com/rust-lang/rust/pull/51899/
2350 [51912]: https://github.com/rust-lang/rust/pull/51912/
2351 [51511]: https://github.com/rust-lang/rust/pull/51511/
2352 [51619]: https://github.com/rust-lang/rust/pull/51619/
2353 [51656]: https://github.com/rust-lang/rust/pull/51656/
2354 [51178]: https://github.com/rust-lang/rust/pull/51178/
2355 [51122]: https://github.com/rust-lang/rust/pull/51122
2356 [50494]: https://github.com/rust-lang/rust/pull/50494/
2357 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2358 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2359 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2360 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2361 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2362 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2363 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2366 Version 1.28.0 (2018-08-02)
2367 ===========================
2371 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2372 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2373 the inner type across Foreign Function Interface (FFI) boundaries.
2374 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2375 and can now be used as identifiers.][51196]
2376 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2377 stable.][51241] This will allow users to specify a global allocator for
2379 - [Unit test functions marked with the `#[test]` attribute can now return
2380 `Result<(), E: Debug>` in addition to `()`.][51298]
2381 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2382 allows macros to easily target lifetimes.
2386 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2387 prioritise making smaller binary sizes. `z` is the same as `s` with the
2388 exception that it does not vectorise loops, which typically results in an even
2390 - [The short error format is now stable.][49546] Specified with
2391 `--error-format=short` this option will provide a more compressed output of
2392 rust error messages.
2393 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2394 - [Reduced the number of allocations in the macro parser.][50855] This can
2395 improve compile times of macro heavy crates on average by 5%.
2399 - [Implemented `Default` for `&mut str`.][51306]
2400 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2401 - [Implemented `Extend` for `()`.][50234]
2402 - [The `Debug` implementation of `time::Duration` should now be more easily
2403 human readable.][50364] Previously a `Duration` of one second would printed as
2404 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2405 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2406 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2407 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2408 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2409 for `PathBuf`.][50170]
2410 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2411 and `Wrapping<i128>`.][50465]
2412 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2413 possible.][51050] This can provide up to a 40% speed increase.
2414 - [Improved error messages when using `format!`.][50610]
2418 - [`Iterator::step_by`]
2419 - [`Path::ancestors`]
2420 - [`SystemTime::UNIX_EPOCH`]
2421 - [`alloc::GlobalAlloc`]
2423 - [`alloc::LayoutErr`]
2426 - [`alloc::alloc_zeroed`]
2427 - [`alloc::dealloc`]
2428 - [`alloc::realloc`]
2429 - [`alloc::handle_alloc_error`]
2430 - [`btree_map::Entry::or_default`]
2431 - [`fmt::Alignment`]
2432 - [`hash_map::Entry::or_default`]
2433 - [`iter::repeat_with`]
2434 - [`num::NonZeroUsize`]
2435 - [`num::NonZeroU128`]
2436 - [`num::NonZeroU16`]
2437 - [`num::NonZeroU32`]
2438 - [`num::NonZeroU64`]
2439 - [`num::NonZeroU8`]
2440 - [`ops::RangeBounds`]
2441 - [`slice::SliceIndex`]
2442 - [`slice::from_mut`]
2443 - [`slice::from_ref`]
2444 - [`{Any + Send + Sync}::downcast_mut`]
2445 - [`{Any + Send + Sync}::downcast_ref`]
2446 - [`{Any + Send + Sync}::is`]
2450 - [Cargo will now no longer allow you to publish crates with build scripts that
2451 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2452 considered to be immutable.
2456 - [The `suggestion_applicability` field in `rustc`'s json output is now
2457 stable.][50486] This will allow dev tools to check whether a code suggestion
2458 would apply to them.
2462 - [Rust will consider trait objects with duplicated constraints to be the same
2463 type as without the duplicated constraint.][51276] For example the below code will
2464 now fail to compile.
2469 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2472 impl Trait + Send + Send {
2473 fn test(&self) { println!("two"); }
2477 [49546]: https://github.com/rust-lang/rust/pull/49546/
2478 [50143]: https://github.com/rust-lang/rust/pull/50143/
2479 [50170]: https://github.com/rust-lang/rust/pull/50170/
2480 [50234]: https://github.com/rust-lang/rust/pull/50234/
2481 [50265]: https://github.com/rust-lang/rust/pull/50265/
2482 [50364]: https://github.com/rust-lang/rust/pull/50364/
2483 [50385]: https://github.com/rust-lang/rust/pull/50385/
2484 [50465]: https://github.com/rust-lang/rust/pull/50465/
2485 [50486]: https://github.com/rust-lang/rust/pull/50486/
2486 [50554]: https://github.com/rust-lang/rust/pull/50554/
2487 [50610]: https://github.com/rust-lang/rust/pull/50610/
2488 [50855]: https://github.com/rust-lang/rust/pull/50855/
2489 [51050]: https://github.com/rust-lang/rust/pull/51050/
2490 [51196]: https://github.com/rust-lang/rust/pull/51196/
2491 [51200]: https://github.com/rust-lang/rust/pull/51200/
2492 [51241]: https://github.com/rust-lang/rust/pull/51241/
2493 [51276]: https://github.com/rust-lang/rust/pull/51276/
2494 [51298]: https://github.com/rust-lang/rust/pull/51298/
2495 [51306]: https://github.com/rust-lang/rust/pull/51306/
2496 [51562]: https://github.com/rust-lang/rust/pull/51562/
2497 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2498 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2499 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2500 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2501 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2502 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2503 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2504 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2505 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2506 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2507 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2508 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2509 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2510 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2511 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2512 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2513 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2514 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2515 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2516 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2517 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2518 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2519 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2520 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2521 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2522 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2523 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2524 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2525 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2526 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2528 Version 1.27.2 (2018-07-20)
2529 ===========================
2534 - The borrow checker was fixed to avoid potential unsoundness when using
2535 match ergonomics: [#52213][52213].
2537 [52213]: https://github.com/rust-lang/rust/issues/52213
2539 Version 1.27.1 (2018-07-10)
2540 ===========================
2545 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2546 when running, which enabled executing code as some other user on a
2547 given machine. This release fixes that vulnerability; you can read
2548 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2550 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2555 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2556 match ergonomics: [#51415][51415], [#49534][49534].
2558 [51415]: https://github.com/rust-lang/rust/issues/51415
2559 [49534]: https://github.com/rust-lang/rust/issues/49534
2560 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2561 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2563 Version 1.27.0 (2018-06-21)
2564 ==========================
2568 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2569 be used as an identifier.
2570 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2571 bare `Trait` syntax, and should make it clearer when being used in tandem with
2572 `impl Trait` because it is equivalent to the following syntax:
2573 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2574 `Box<Trait> == Box<dyn Trait>`.
2575 - [Attributes on generic parameters such as types and lifetimes are
2576 now stable.][48851] e.g.
2577 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2578 - [The `#[must_use]` attribute can now also be used on functions as well as
2579 types.][48925] It provides a lint that by default warns users when the
2580 value returned by a function has not been used.
2584 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2588 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2589 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2590 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2591 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2592 the `cfg` attribute.
2593 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2594 std are now available in core.][49896]
2595 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2597 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2598 that the operation isn't done in place.
2599 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2600 the `#[must_use]` attribute][49533] to warn about unused potentially
2601 expensive allocations.
2605 - [`DoubleEndedIterator::rfind`]
2606 - [`DoubleEndedIterator::rfold`]
2607 - [`DoubleEndedIterator::try_rfold`]
2608 - [`Duration::from_micros`]
2609 - [`Duration::from_nanos`]
2610 - [`Duration::subsec_micros`]
2611 - [`Duration::subsec_millis`]
2612 - [`HashMap::remove_entry`]
2613 - [`Iterator::try_fold`]
2614 - [`Iterator::try_for_each`]
2616 - [`Option::filter`]
2617 - [`String::replace_range`]
2618 - [`Take::set_limit`]
2619 - [`hint::unreachable_unchecked`]
2620 - [`os::unix::process::parent_id`]
2621 - [`ptr::swap_nonoverlapping`]
2622 - [`slice::rsplit_mut`]
2624 - [`slice::swap_with_slice`]
2628 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2629 `readme`, and `repository` fields.][cargo/5386]
2630 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2631 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2632 a different directory than `target` for placing compilation artifacts.
2633 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2634 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2635 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2636 where cargo would infer a binary, Cargo will produce a warning. You can
2637 disable this feature ahead of time by setting any of the following to false:
2638 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2639 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2640 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2644 - [Added “The Rustc book” into the official documentation.][49707]
2645 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2646 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2650 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2651 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2652 compile, `"".is_empty()` will still compile.
2653 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2654 will only print the inner type.][48553] E.g.
2655 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2656 not `AtomicBool(true)`.
2657 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2658 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2659 alignment should cover all use cases.
2660 - The `.description()` method on the `std::error::Error` trait
2661 [has been soft-deprecated][50163]. It is no longer required to implement it.
2663 [48553]: https://github.com/rust-lang/rust/pull/48553/
2664 [48851]: https://github.com/rust-lang/rust/pull/48851/
2665 [48925]: https://github.com/rust-lang/rust/pull/48925/
2666 [49533]: https://github.com/rust-lang/rust/pull/49533/
2667 [49623]: https://github.com/rust-lang/rust/pull/49623/
2668 [49630]: https://github.com/rust-lang/rust/pull/49630/
2669 [49664]: https://github.com/rust-lang/rust/pull/49664/
2670 [49699]: https://github.com/rust-lang/rust/pull/49699/
2671 [49707]: https://github.com/rust-lang/rust/pull/49707/
2672 [49719]: https://github.com/rust-lang/rust/pull/49719/
2673 [49896]: https://github.com/rust-lang/rust/pull/49896/
2674 [49968]: https://github.com/rust-lang/rust/pull/49968/
2675 [50163]: https://github.com/rust-lang/rust/pull/50163
2676 [50177]: https://github.com/rust-lang/rust/pull/50177/
2677 [50378]: https://github.com/rust-lang/rust/pull/50378/
2678 [50398]: https://github.com/rust-lang/rust/pull/50398/
2679 [50423]: https://github.com/rust-lang/rust/pull/50423/
2680 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2681 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2682 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2683 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2684 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2685 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2686 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2687 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2688 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2689 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2690 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2691 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2692 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2693 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2694 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2695 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2696 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2697 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2698 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2699 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2700 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2701 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2702 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2703 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2704 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2705 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2706 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2707 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2708 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2709 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2712 Version 1.26.2 (2018-06-05)
2713 ==========================
2718 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2720 [51117]: https://github.com/rust-lang/rust/issues/51117
2723 Version 1.26.1 (2018-05-29)
2724 ==========================
2729 - [RLS now works on Windows.][50646]
2730 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2736 - [`fn main() -> impl Trait` no longer works for non-Termination
2738 This reverts an accidental stabilization.
2739 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2740 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2742 [50646]: https://github.com/rust-lang/rust/issues/50646
2743 [50656]: https://github.com/rust-lang/rust/pull/50656
2744 [50812]: https://github.com/rust-lang/rust/pull/50812
2745 [50950]: https://github.com/rust-lang/rust/issues/50950
2746 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2748 Version 1.26.0 (2018-05-10)
2749 ==========================
2753 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2754 implement either or both traits.][49299]
2755 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2756 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2757 lifetime can be elided.][49458]
2758 - [`impl Trait` is now stable allowing you to have abstract types in returns
2759 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2760 `fn open(path: impl AsRef<Path>)`.
2761 - [Pattern matching will now automatically apply dereferences.][49394]
2762 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2763 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2764 - [A lot of operations are now available in a const context.][46882] E.g. You
2765 can now index into constant arrays, reference and dereference into constants,
2766 and use tuple struct constructors.
2767 - [Fixed entry slice patterns are now stable.][48516] E.g.
2769 let points = [1, 2, 3, 4];
2771 [1, 2, 3, 4] => println!("All points were sequential."),
2772 _ => println!("Not all points were sequential."),
2779 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2780 - [Fixed exponential projection complexity on nested types.][48296]
2781 This can provide up to a ~12% reduction in compile times for certain crates.
2782 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2783 to remap path prefixes outputted by the compiler.
2784 - [Added `powerpc-unknown-netbsd` target.][48281]
2788 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2789 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2790 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2791 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2792 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2793 - [`ascii::escape_default` is now available in libcore.][48735]
2794 - [Trailing commas are now supported in std and core macros.][48056]
2795 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2796 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2801 - [`*const T::copy_to_nonoverlapping`]
2802 - [`*const T::copy_to`]
2803 - [`*const T::read_unaligned`]
2804 - [`*const T::read_volatile`]
2805 - [`*const T::read`]
2807 - [`*const T::wrapping_add`]
2808 - [`*const T::wrapping_sub`]
2810 - [`*mut T::copy_to_nonoverlapping`]
2811 - [`*mut T::copy_to`]
2812 - [`*mut T::read_unaligned`]
2813 - [`*mut T::read_volatile`]
2815 - [`*mut T::replace`]
2818 - [`*mut T::wrapping_add`]
2819 - [`*mut T::wrapping_sub`]
2820 - [`*mut T::write_bytes`]
2821 - [`*mut T::write_unaligned`]
2822 - [`*mut T::write_volatile`]
2825 - [`FromUtf8Error::as_bytes`]
2826 - [`LocalKey::try_with`]
2827 - [`Option::cloned`]
2828 - [`btree_map::Entry::and_modify`]
2829 - [`fs::read_to_string`]
2832 - [`hash_map::Entry::and_modify`]
2833 - [`iter::FusedIterator`]
2834 - [`ops::RangeInclusive`]
2835 - [`ops::RangeToInclusive`]
2837 - [`slice::rotate_left`]
2838 - [`slice::rotate_right`]
2839 - [`String::retain`]
2844 - [Cargo will now output path to custom commands when `-v` is
2845 passed with `--list`][cargo/5041]
2846 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2850 - [The second edition of "The Rust Programming Language" book is now recommended
2851 over the first.][48404]
2856 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2857 syntax is now invalid.
2859 use std::ops::Fn as dyn;
2860 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2862 - [The result of dereferences are no longer promoted to `'static`.][47408]
2866 const PAIR: &(i32, i32) = &(0, 1);
2867 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2870 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2871 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2873 - [Removed hoedown from rustdoc.][48274]
2874 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2876 [46882]: https://github.com/rust-lang/rust/pull/46882
2877 [47379]: https://github.com/rust-lang/rust/pull/47379
2878 [47408]: https://github.com/rust-lang/rust/pull/47408
2879 [47813]: https://github.com/rust-lang/rust/pull/47813
2880 [48056]: https://github.com/rust-lang/rust/pull/48056
2881 [48125]: https://github.com/rust-lang/rust/pull/48125
2882 [48166]: https://github.com/rust-lang/rust/pull/48166
2883 [48235]: https://github.com/rust-lang/rust/pull/48235
2884 [48274]: https://github.com/rust-lang/rust/pull/48274
2885 [48281]: https://github.com/rust-lang/rust/pull/48281
2886 [48296]: https://github.com/rust-lang/rust/pull/48296
2887 [48326]: https://github.com/rust-lang/rust/pull/48326
2888 [48359]: https://github.com/rust-lang/rust/pull/48359
2889 [48404]: https://github.com/rust-lang/rust/pull/48404
2890 [48481]: https://github.com/rust-lang/rust/pull/48481
2891 [48516]: https://github.com/rust-lang/rust/pull/48516
2892 [48628]: https://github.com/rust-lang/rust/pull/48628
2893 [48629]: https://github.com/rust-lang/rust/pull/48629
2894 [48657]: https://github.com/rust-lang/rust/pull/48657
2895 [48735]: https://github.com/rust-lang/rust/pull/48735
2896 [48978]: https://github.com/rust-lang/rust/pull/48978
2897 [49101]: https://github.com/rust-lang/rust/pull/49101
2898 [49109]: https://github.com/rust-lang/rust/pull/49109
2899 [49121]: https://github.com/rust-lang/rust/pull/49121
2900 [49162]: https://github.com/rust-lang/rust/pull/49162
2901 [49184]: https://github.com/rust-lang/rust/pull/49184
2902 [49234]: https://github.com/rust-lang/rust/pull/49234
2903 [49255]: https://github.com/rust-lang/rust/pull/49255
2904 [49299]: https://github.com/rust-lang/rust/pull/49299
2905 [49305]: https://github.com/rust-lang/rust/pull/49305
2906 [49394]: https://github.com/rust-lang/rust/pull/49394
2907 [49458]: https://github.com/rust-lang/rust/pull/49458
2908 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2909 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2910 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2911 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2912 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2913 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2914 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2915 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2916 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2917 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2918 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2919 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2920 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2921 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2922 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2923 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2924 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2925 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2926 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2927 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2928 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2929 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2930 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2931 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2932 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2933 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2934 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2935 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2936 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2937 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2938 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2939 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2940 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2941 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2942 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2943 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2944 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2945 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2946 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2947 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2948 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2949 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2952 Version 1.25.0 (2018-03-29)
2953 ==========================
2957 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2958 - [You can now use nested groups of imports.][47948]
2959 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2960 - [You can now have `|` at the start of a match arm.][47947] e.g.
2962 enum Foo { A, B, C }
2968 | Foo::B => println!("AB"),
2969 | Foo::C => println!("C"),
2976 - [Upgraded to LLVM 6.][47828]
2977 - [Added `-C lto=val` option.][47521]
2978 - [Added `i586-unknown-linux-musl` target][47282]
2982 - [Impl Send for `process::Command` on Unix.][47760]
2983 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2984 - [`UnsafeCell::into_inner` is now safe.][47204]
2985 - [Implement libstd for CloudABI.][47268]
2986 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2987 - [Implement `AsRef<Path>` for Component][46985]
2988 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2989 - [Moved `Duration` to libcore.][46666]
2993 - [`Location::column`]
2996 The following functions can now be used in a constant expression.
2997 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2998 - [`Duration::new`][47300]
2999 - [`Duration::from_secs`][47300]
3000 - [`Duration::from_millis`][47300]
3004 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3005 - [`cargo new` now defaults to creating a binary crate, instead of a
3006 library crate.][cargo/5029]
3010 - [Rust by example is now shipped with new releases][46196]
3014 - [Deprecated `net::lookup_host`.][47510]
3015 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3016 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3017 around indexing operations (see [#47349][47349]). This has been fixed (which also
3018 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3019 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3021 [33903]: https://github.com/rust-lang/rust/pull/33903
3022 [47947]: https://github.com/rust-lang/rust/pull/47947
3023 [47948]: https://github.com/rust-lang/rust/pull/47948
3024 [47760]: https://github.com/rust-lang/rust/pull/47760
3025 [47790]: https://github.com/rust-lang/rust/pull/47790
3026 [47828]: https://github.com/rust-lang/rust/pull/47828
3027 [47398]: https://github.com/rust-lang/rust/pull/47398
3028 [47510]: https://github.com/rust-lang/rust/pull/47510
3029 [47521]: https://github.com/rust-lang/rust/pull/47521
3030 [47204]: https://github.com/rust-lang/rust/pull/47204
3031 [47251]: https://github.com/rust-lang/rust/pull/47251
3032 [47268]: https://github.com/rust-lang/rust/pull/47268
3033 [47282]: https://github.com/rust-lang/rust/pull/47282
3034 [47300]: https://github.com/rust-lang/rust/pull/47300
3035 [47349]: https://github.com/rust-lang/rust/pull/47349
3036 [46931]: https://github.com/rust-lang/rust/pull/46931
3037 [46985]: https://github.com/rust-lang/rust/pull/46985
3038 [47006]: https://github.com/rust-lang/rust/pull/47006
3039 [46830]: https://github.com/rust-lang/rust/pull/46830
3040 [46095]: https://github.com/rust-lang/rust/pull/46095
3041 [46666]: https://github.com/rust-lang/rust/pull/46666
3042 [46196]: https://github.com/rust-lang/rust/pull/46196
3043 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3044 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3045 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3046 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3047 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3050 Version 1.24.1 (2018-03-01)
3051 ==========================
3053 - [Do not abort when unwinding through FFI][48251]
3054 - [Emit UTF-16 files for linker arguments on Windows][48318]
3055 - [Make the error index generator work again][48308]
3056 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3058 [48251]: https://github.com/rust-lang/rust/issues/48251
3059 [48308]: https://github.com/rust-lang/rust/issues/48308
3060 [48318]: https://github.com/rust-lang/rust/issues/48318
3061 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3064 Version 1.24.0 (2018-02-15)
3065 ==========================
3069 - [External `sysv64` ffi is now available.][46528]
3070 eg. `extern "sysv64" fn foo () {}`
3074 - [rustc now uses 16 codegen units by default for release builds.][46910]
3075 For the fastest builds, utilize `codegen-units=1`.
3076 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3077 - [Add `aarch64-unknown-openbsd` support][46760]
3081 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3082 improvement in performance in the majority of cases.
3083 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3084 with Windows.][46798]
3085 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3086 - [impl `From<bool>` for `AtomicBool`][46293]
3087 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3088 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3089 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3090 - [float::from_bits now just uses transmute.][46012] This provides
3091 some optimisations from LLVM.
3092 - [Copied `AsciiExt` methods onto `char`][46077]
3093 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3094 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3095 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3096 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3100 - [`RefCell::replace`]
3102 - [`atomic::spin_loop_hint`]
3104 The following functions can now be used in a constant expression.
3105 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3107 - [`AtomicBool::new`][46287]
3108 - [`AtomicUsize::new`][46287]
3109 - [`AtomicIsize::new`][46287]
3110 - [`AtomicPtr::new`][46287]
3111 - [`Cell::new`][46287]
3112 - [`{integer}::min_value`][46287]
3113 - [`{integer}::max_value`][46287]
3114 - [`mem::size_of`][46287]
3115 - [`mem::align_of`][46287]
3116 - [`ptr::null`][46287]
3117 - [`ptr::null_mut`][46287]
3118 - [`RefCell::new`][46287]
3119 - [`UnsafeCell::new`][46287]
3123 - [Added a `workspace.default-members` config that
3124 overrides implied `--all` in virtual workspaces.][cargo/4743]
3125 - [Enable incremental by default on development builds.][cargo/4817] Also added
3126 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3127 per-project or global basis respectively.
3134 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3135 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3136 in accordance with IETF RFC 4291 §2.2.
3137 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3138 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3139 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3140 - [Leading zeros in tuple struct members is now an error][47084]
3141 - [`column!()` macro is one-based instead of zero-based][46977]
3142 - [`fmt::Arguments` can no longer be shared across threads][45198]
3143 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3144 - [Cargo sets a different working directory for the compiler][cargo/4788]
3146 [44884]: https://github.com/rust-lang/rust/pull/44884
3147 [45198]: https://github.com/rust-lang/rust/pull/45198
3148 [45506]: https://github.com/rust-lang/rust/pull/45506
3149 [45904]: https://github.com/rust-lang/rust/pull/45904
3150 [45990]: https://github.com/rust-lang/rust/pull/45990
3151 [46012]: https://github.com/rust-lang/rust/pull/46012
3152 [46077]: https://github.com/rust-lang/rust/pull/46077
3153 [46094]: https://github.com/rust-lang/rust/pull/46094
3154 [46284]: https://github.com/rust-lang/rust/pull/46284
3155 [46287]: https://github.com/rust-lang/rust/pull/46287
3156 [46293]: https://github.com/rust-lang/rust/pull/46293
3157 [46528]: https://github.com/rust-lang/rust/pull/46528
3158 [46671]: https://github.com/rust-lang/rust/pull/46671
3159 [46713]: https://github.com/rust-lang/rust/pull/46713
3160 [46735]: https://github.com/rust-lang/rust/pull/46735
3161 [46749]: https://github.com/rust-lang/rust/pull/46749
3162 [46760]: https://github.com/rust-lang/rust/pull/46760
3163 [46798]: https://github.com/rust-lang/rust/pull/46798
3164 [46828]: https://github.com/rust-lang/rust/pull/46828
3165 [46831]: https://github.com/rust-lang/rust/pull/46831
3166 [46833]: https://github.com/rust-lang/rust/pull/46833
3167 [46910]: https://github.com/rust-lang/rust/pull/46910
3168 [46977]: https://github.com/rust-lang/rust/pull/46977
3169 [47018]: https://github.com/rust-lang/rust/pull/47018
3170 [47080]: https://github.com/rust-lang/rust/pull/47080
3171 [47084]: https://github.com/rust-lang/rust/pull/47084
3172 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3173 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3174 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3175 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3176 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3177 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3180 Version 1.23.0 (2018-01-04)
3181 ==========================
3185 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3186 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3187 Which should fix some confusing errors in some operations.
3191 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3192 undefined behavior.][45920]
3193 - [rustc now suggests renaming import if names clash.][45660]
3194 - [Display errors/warnings correctly when there are zero-width or
3195 wide characters.][45711]
3196 - [rustc now avoids unnecessary copies of arguments that are
3197 simple bindings][45380] This should improve memory usage on average by 5-10%.
3198 - [Updated musl used to build musl rustc to 1.1.17][45393]
3202 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3203 - [Implement Hash for raw pointers to unsized types][45483]
3204 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3205 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3206 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3207 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3208 and `<*mut T>::as_mut`][44932]
3209 - [Optimized `Thread::{park, unpark}` implementation][45524]
3210 - [Improved `SliceExt::binary_search` performance.][45333]
3211 - [impl `FromIterator<()>` for `()`][45379]
3212 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3220 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3221 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3222 - [Added unit test checking to `cargo check`][cargo/4592]
3223 - [Cargo now lets you install a specific version
3224 using `cargo install --version`][cargo/4637]
3228 - [Releases now ship with the Cargo book documentation.][45692]
3229 - [rustdoc now prints rendering warnings on every run.][45324]
3233 - [Changes have been made to type equality to make it more correct,
3234 in rare cases this could break some code.][45853] [Tracking issue for
3235 further information][45852]
3236 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3237 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3238 Android 9, the minimum supported version is Android 14.
3239 - [Bumped the minimum LLVM to 3.9][45326]
3241 [44042]: https://github.com/rust-lang/rust/pull/44042
3242 [44932]: https://github.com/rust-lang/rust/pull/44932
3243 [45267]: https://github.com/rust-lang/rust/pull/45267
3244 [45324]: https://github.com/rust-lang/rust/pull/45324
3245 [45326]: https://github.com/rust-lang/rust/pull/45326
3246 [45333]: https://github.com/rust-lang/rust/pull/45333
3247 [45379]: https://github.com/rust-lang/rust/pull/45379
3248 [45380]: https://github.com/rust-lang/rust/pull/45380
3249 [45393]: https://github.com/rust-lang/rust/pull/45393
3250 [45435]: https://github.com/rust-lang/rust/pull/45435
3251 [45483]: https://github.com/rust-lang/rust/pull/45483
3252 [45524]: https://github.com/rust-lang/rust/pull/45524
3253 [45571]: https://github.com/rust-lang/rust/pull/45571
3254 [45580]: https://github.com/rust-lang/rust/pull/45580
3255 [45610]: https://github.com/rust-lang/rust/pull/45610
3256 [45660]: https://github.com/rust-lang/rust/pull/45660
3257 [45692]: https://github.com/rust-lang/rust/pull/45692
3258 [45711]: https://github.com/rust-lang/rust/pull/45711
3259 [45772]: https://github.com/rust-lang/rust/pull/45772
3260 [45852]: https://github.com/rust-lang/rust/issues/45852
3261 [45853]: https://github.com/rust-lang/rust/pull/45853
3262 [45887]: https://github.com/rust-lang/rust/pull/45887
3263 [45920]: https://github.com/rust-lang/rust/pull/45920
3264 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3265 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3266 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3269 Version 1.22.1 (2017-11-22)
3270 ==========================
3272 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3274 [46183]: https://github.com/rust-lang/rust/pull/46183
3276 Version 1.22.0 (2017-11-22)
3277 ==========================
3281 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3282 - [Now accepts underscores in unicode escapes][43716]
3283 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3284 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3288 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3289 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3290 This should decrease compile times for debug builds.
3291 - [strict memory alignment now enabled on ARMv6][45094]
3292 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3296 - [Allow atomic operations up to 32 bits
3297 on `armv5te_unknown_linux_gnueabi`][44978]
3298 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3299 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3300 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3301 - [Properly detect overflow in `Instant += Duration`.][44220]
3302 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3303 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3304 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3311 - [Cargo will now build multi file examples in subdirectories of the `examples`
3312 folder that have a `main.rs` file.][cargo/4496]
3313 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3314 the old format will continue to work and can be updated with `cargo update`.
3315 - [Now supports vendoring git repositories][cargo/3992]
3319 - [`libbacktrace` is now available on Apple platforms.][44251]
3320 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3321 This now lets you specify that a given code example will fail to compile.
3325 - [The minimum Android version that rustc can build for has been bumped
3326 to `4.0` from `2.3`][45656]
3327 - [Allowing `T op= &T` for numeric types has broken some type
3328 inference cases][45480]
3331 [42526]: https://github.com/rust-lang/rust/pull/42526
3332 [43017]: https://github.com/rust-lang/rust/pull/43017
3333 [43716]: https://github.com/rust-lang/rust/pull/43716
3334 [43949]: https://github.com/rust-lang/rust/pull/43949
3335 [44015]: https://github.com/rust-lang/rust/pull/44015
3336 [44220]: https://github.com/rust-lang/rust/pull/44220
3337 [44251]: https://github.com/rust-lang/rust/pull/44251
3338 [44287]: https://github.com/rust-lang/rust/pull/44287
3339 [44303]: https://github.com/rust-lang/rust/pull/44303
3340 [44456]: https://github.com/rust-lang/rust/pull/44456
3341 [44466]: https://github.com/rust-lang/rust/pull/44466
3342 [44895]: https://github.com/rust-lang/rust/pull/44895
3343 [44966]: https://github.com/rust-lang/rust/pull/44966
3344 [44978]: https://github.com/rust-lang/rust/pull/44978
3345 [45041]: https://github.com/rust-lang/rust/pull/45041
3346 [45064]: https://github.com/rust-lang/rust/pull/45064
3347 [45075]: https://github.com/rust-lang/rust/pull/45075
3348 [45094]: https://github.com/rust-lang/rust/pull/45094
3349 [45095]: https://github.com/rust-lang/rust/pull/45095
3350 [45480]: https://github.com/rust-lang/rust/issues/45480
3351 [45656]: https://github.com/rust-lang/rust/pull/45656
3352 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3353 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3354 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3361 Version 1.21.0 (2017-10-12)
3362 ==========================
3366 - [You can now use static references for literals.][43838]
3370 let x: &'static u32 = &0;
3373 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3376 my_macro!(Vec<i32>::new); // Always worked
3377 my_macro!(Vec::<i32>::new); // Now works
3382 - [Upgraded jemalloc to 4.5.0][43911]
3383 - [Enabled unwinding panics on Redox][43917]
3384 - [Now runs LLVM in parallel during translation phase.][43506]
3385 This should reduce peak memory usage.
3389 - [Generate builtin impls for `Clone` for all arrays and tuples that
3390 are `T: Clone`][43690]
3391 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3392 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3393 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3398 [`std::mem::discriminant`]
3402 - [You can now call `cargo install` with multiple package names][cargo/4216]
3403 - [Cargo commands inside a virtual workspace will now implicitly
3404 pass `--all`][cargo/4335]
3405 - [Added a `[patch]` section to `Cargo.toml` to handle
3406 prepublication dependencies][cargo/4123] [RFC 1969]
3407 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3408 like patterns][cargo/4270]
3409 - [Added the `--all-targets` option][cargo/4400]
3410 - [Using required dependencies as a feature is now deprecated and emits
3411 a warning][cargo/4364]
3416 - [Cargo docs are moving][43916]
3417 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3418 - [The rustdoc book is now available][43863]
3419 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3420 - [Added a preview of RLS has been made available through rustup][44204]
3421 Install with `rustup component add rls-preview`
3422 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3423 Previously only showed `std::os::unix`.
3427 - [Changes in method matching against higher-ranked types][43880] This may cause
3428 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3429 - [rustc's JSON error output's byte position start at top of file.][42973]
3430 Was previously relative to the rustc's internal `CodeMap` struct which
3431 required the unstable library `libsyntax` to correctly use.
3432 - [`unused_results` lint no longer ignores booleans][43728]
3434 [42565]: https://github.com/rust-lang/rust/pull/42565
3435 [42973]: https://github.com/rust-lang/rust/pull/42973
3436 [43348]: https://github.com/rust-lang/rust/pull/43348
3437 [43459]: https://github.com/rust-lang/rust/pull/43459
3438 [43506]: https://github.com/rust-lang/rust/pull/43506
3439 [43540]: https://github.com/rust-lang/rust/pull/43540
3440 [43690]: https://github.com/rust-lang/rust/pull/43690
3441 [43728]: https://github.com/rust-lang/rust/pull/43728
3442 [43838]: https://github.com/rust-lang/rust/pull/43838
3443 [43863]: https://github.com/rust-lang/rust/pull/43863
3444 [43880]: https://github.com/rust-lang/rust/pull/43880
3445 [43911]: https://github.com/rust-lang/rust/pull/43911
3446 [43916]: https://github.com/rust-lang/rust/pull/43916
3447 [43917]: https://github.com/rust-lang/rust/pull/43917
3448 [44204]: https://github.com/rust-lang/rust/pull/44204
3449 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3450 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3451 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3452 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3453 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3454 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3455 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3456 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3457 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3459 Version 1.20.0 (2017-08-31)
3460 ===========================
3464 - [Associated constants are now stabilised.][42809]
3465 - [A lot of macro bugs are now fixed.][42913]
3470 - [Struct fields are now properly coerced to the expected field type.][42807]
3471 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3472 `wasm32-experimental-emscripten` target.
3473 - [Changed some of the error messages to be more helpful.][42033]
3474 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3476 - [rustc now reports the total number of errors on compilation failure][43015]
3477 previously this was only the number of errors in the pass that failed.
3478 - [Expansion in rustc has been sped up 29x.][42533]
3479 - [added `msp430-none-elf` target.][43099]
3480 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3482 - [Fixes backtraces on Redox][43228]
3483 - [rustc now identifies different versions of same crate when absolute paths of
3484 different types match in an error message.][42826]
3490 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3491 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3493 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3494 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3495 - [Impl `Clone` for `DefaultHasher`.][42799]
3496 - [Impl `Sync` for `SyncSender`.][42397]
3497 - [Impl `FromStr` for `char`][42271]
3498 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3500 - [allow messages in the `unimplemented!()` macro.][42155]
3501 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3502 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3503 - [Upgrade to Unicode 10.0.0][42999]
3504 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3505 - [Skip the main thread's manual stack guard on Linux][43072]
3506 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3507 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3509 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3514 - [`CStr::into_c_string`]
3515 - [`CString::as_c_str`]
3516 - [`CString::into_boxed_c_str`]
3517 - [`Chain::get_mut`]
3518 - [`Chain::get_ref`]
3519 - [`Chain::into_inner`]
3520 - [`Option::get_or_insert_with`]
3521 - [`Option::get_or_insert`]
3522 - [`OsStr::into_os_string`]
3523 - [`OsString::into_boxed_os_str`]
3526 - [`Utf8Error::error_len`]
3527 - [`char::EscapeDebug`]
3528 - [`char::escape_debug`]
3529 - [`compile_error!`]
3530 - [`f32::from_bits`]
3532 - [`f64::from_bits`]
3534 - [`mem::ManuallyDrop`]
3535 - [`slice::sort_unstable_by_key`]
3536 - [`slice::sort_unstable_by`]
3537 - [`slice::sort_unstable`]
3538 - [`str::from_boxed_utf8_unchecked`]
3539 - [`str::as_bytes_mut`]
3540 - [`str::as_bytes_mut`]
3541 - [`str::from_utf8_mut`]
3542 - [`str::from_utf8_unchecked_mut`]
3544 - [`str::get_unchecked_mut`]
3545 - [`str::get_unchecked`]
3547 - [`str::into_boxed_bytes`]
3552 - [Cargo API token location moved from `~/.cargo/config` to
3553 `~/.cargo/credentials`.][cargo/3978]
3554 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3555 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3556 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3557 - [You can now specify version of a binary when installed through
3558 `cargo install` using `--vers`.][cargo/4229]
3559 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3560 failure.][cargo/4248]
3561 - [Changed the convention around which file is the crate root.][cargo/4259]
3562 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3563 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3568 - [Functions with `'static` in their return types will now not be as usable as
3569 if they were using lifetime parameters instead.][42417]
3570 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3571 takes the sign of NaN into account where previously didn't.][42430]
3573 [42033]: https://github.com/rust-lang/rust/pull/42033
3574 [42155]: https://github.com/rust-lang/rust/pull/42155
3575 [42271]: https://github.com/rust-lang/rust/pull/42271
3576 [42397]: https://github.com/rust-lang/rust/pull/42397
3577 [42417]: https://github.com/rust-lang/rust/pull/42417
3578 [42430]: https://github.com/rust-lang/rust/pull/42430
3579 [42431]: https://github.com/rust-lang/rust/pull/42431
3580 [42533]: https://github.com/rust-lang/rust/pull/42533
3581 [42571]: https://github.com/rust-lang/rust/pull/42571
3582 [42613]: https://github.com/rust-lang/rust/pull/42613
3583 [42799]: https://github.com/rust-lang/rust/pull/42799
3584 [42807]: https://github.com/rust-lang/rust/pull/42807
3585 [42809]: https://github.com/rust-lang/rust/pull/42809
3586 [42822]: https://github.com/rust-lang/rust/pull/42822
3587 [42826]: https://github.com/rust-lang/rust/pull/42826
3588 [42854]: https://github.com/rust-lang/rust/pull/42854
3589 [42913]: https://github.com/rust-lang/rust/pull/42913
3590 [42999]: https://github.com/rust-lang/rust/pull/42999
3591 [43011]: https://github.com/rust-lang/rust/pull/43011
3592 [43015]: https://github.com/rust-lang/rust/pull/43015
3593 [43072]: https://github.com/rust-lang/rust/pull/43072
3594 [43077]: https://github.com/rust-lang/rust/pull/43077
3595 [43097]: https://github.com/rust-lang/rust/pull/43097
3596 [43099]: https://github.com/rust-lang/rust/pull/43099
3597 [43170]: https://github.com/rust-lang/rust/pull/43170
3598 [43178]: https://github.com/rust-lang/rust/pull/43178
3599 [43185]: https://github.com/rust-lang/rust/pull/43185
3600 [43228]: https://github.com/rust-lang/rust/pull/43228
3601 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3602 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3603 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3604 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3605 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3606 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3607 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3608 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3609 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3610 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3611 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3612 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3613 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3614 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3615 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3616 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3617 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3618 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3619 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3620 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3621 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3622 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3623 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3624 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3625 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3626 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3627 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3628 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3629 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3630 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3631 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3632 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3633 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3634 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3635 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3636 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3637 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3638 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3639 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3642 Version 1.19.0 (2017-07-20)
3643 ===========================
3648 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3649 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3650 - [Macro recursion limit increased to 1024 from 64.][41676]
3651 - [Added lint for detecting unused macros.][41907]
3652 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3653 For example: `let x = loop { break 7; };`
3654 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3655 contain `Copy` types and cannot have a `Drop` implementation.
3656 Example: `union Foo { bar: u8, baz: usize }`
3657 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3658 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3663 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3664 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3665 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3666 you should use `--target armv7-linux-androideabi`.
3667 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3668 - [Minor optimisation of string operations.][42037]
3669 - [Compiler error message is now `aborting due to previous error(s)` instead of
3670 `aborting due to N previous errors`][42150] This was previously inaccurate and
3671 would only count certain kinds of errors.
3672 - [The compiler now supports Visual Studio 2017][42225]
3673 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3674 - [Added a lot][42264] of [new error codes][42302]
3675 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3676 libraries with C Run-time Libraries(CRT) to be statically linked.
3677 - [Fixed various ARM codegen bugs][42740]
3682 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3683 `Extend<Cow<'a, str>>`][41449]
3684 - [`Vec` now implements `From<&mut [T]>`][41530]
3685 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3686 - [`SplitWhitespace` now implements `Clone`][41659]
3687 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3689 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3690 macros, but for printing to stderr.
3695 - [`OsString::shrink_to_fit`]
3698 - [`thread::ThreadId`]
3703 - [Build scripts can now add environment variables to the environment
3704 the crate is being compiled in.
3705 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3706 - [Subcommands now replace the current process rather than spawning a new
3707 child process][cargo/3970]
3708 - [Workspace members can now accept glob file patterns][cargo/3979]
3709 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3710 the members in a given workspace.][cargo/3988]
3711 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3712 - [Target directory path is now in the cargo metadata][cargo/4022]
3713 - [Cargo no longer checks out a local working directory for the
3714 crates.io index][cargo/4026] This should provide smaller file size for the
3715 registry, and improve cloning times, especially on Windows machines.
3716 - [Added an `--exclude` option for excluding certain packages when using the
3717 `--all` option][cargo/4031]
3718 - [Cargo will now automatically retry when receiving a 5xx error
3719 from crates.io][cargo/4032]
3720 - [The `--features` option now accepts multiple comma or space
3721 delimited values.][cargo/4084]
3722 - [Added support for custom target specific runners][cargo/3954]
3727 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3729 - [Rust will now release XZ compressed packages][rust-installer/57]
3730 - [rustup will now prefer to download rust packages with
3731 XZ compression][rustup/1100] over GZip packages.
3732 - [Added the ability to escape `#` in rust documentation][41785] By adding
3733 additional `#`'s ie. `##` is now `#`
3738 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3739 - [`-Z` flags are now no longer allowed to be used on the stable
3740 compiler.][41751] This has been a warning for a year previous to this.
3741 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3742 longer works][42844]. Users should migrate to the built-in `check`
3743 command, which has been available since 1.16.
3744 - [Ending a float literal with `._` is now a hard error.
3745 Example: `42._` .][41946]
3746 - [Any use of a private `extern crate` outside of its module is now a
3747 hard error.][36886] This was previously a warning.
3748 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3749 relative while the `::` prefix makes a path absolute, but was ignored and the
3750 path was relative regardless.
3751 - [Floating point constants in match patterns is now a hard error][36890]
3752 This was previously a warning.
3753 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3754 match patterns is now a hard error][36891] This was previously a warning.
3755 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3757 - [From the pound escape, lines consisting of multiple `#`s are
3759 - [It is an error to re-export private enum variants][42460]. This is
3760 known to break a number of crates that depend on an older version of
3762 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3763 to use it to find the linker, and the build will fail where it did
3764 not previously][42607]
3766 [36886]: https://github.com/rust-lang/rust/issues/36886
3767 [36888]: https://github.com/rust-lang/rust/issues/36888
3768 [36890]: https://github.com/rust-lang/rust/issues/36890
3769 [36891]: https://github.com/rust-lang/rust/issues/36891
3770 [36892]: https://github.com/rust-lang/rust/issues/36892
3771 [37406]: https://github.com/rust-lang/rust/issues/37406
3772 [39983]: https://github.com/rust-lang/rust/pull/39983
3773 [41145]: https://github.com/rust-lang/rust/pull/41145
3774 [41192]: https://github.com/rust-lang/rust/pull/41192
3775 [41258]: https://github.com/rust-lang/rust/pull/41258
3776 [41370]: https://github.com/rust-lang/rust/pull/41370
3777 [41449]: https://github.com/rust-lang/rust/pull/41449
3778 [41530]: https://github.com/rust-lang/rust/pull/41530
3779 [41624]: https://github.com/rust-lang/rust/pull/41624
3780 [41656]: https://github.com/rust-lang/rust/pull/41656
3781 [41659]: https://github.com/rust-lang/rust/pull/41659
3782 [41676]: https://github.com/rust-lang/rust/pull/41676
3783 [41751]: https://github.com/rust-lang/rust/pull/41751
3784 [41764]: https://github.com/rust-lang/rust/pull/41764
3785 [41785]: https://github.com/rust-lang/rust/pull/41785
3786 [41873]: https://github.com/rust-lang/rust/pull/41873
3787 [41907]: https://github.com/rust-lang/rust/pull/41907
3788 [41946]: https://github.com/rust-lang/rust/pull/41946
3789 [42016]: https://github.com/rust-lang/rust/pull/42016
3790 [42037]: https://github.com/rust-lang/rust/pull/42037
3791 [42068]: https://github.com/rust-lang/rust/pull/42068
3792 [42150]: https://github.com/rust-lang/rust/pull/42150
3793 [42162]: https://github.com/rust-lang/rust/pull/42162
3794 [42225]: https://github.com/rust-lang/rust/pull/42225
3795 [42264]: https://github.com/rust-lang/rust/pull/42264
3796 [42302]: https://github.com/rust-lang/rust/pull/42302
3797 [42460]: https://github.com/rust-lang/rust/issues/42460
3798 [42607]: https://github.com/rust-lang/rust/issues/42607
3799 [42740]: https://github.com/rust-lang/rust/pull/42740
3800 [42844]: https://github.com/rust-lang/rust/issues/42844
3801 [42948]: https://github.com/rust-lang/rust/pull/42948
3802 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3803 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3804 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3805 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3806 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3807 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3808 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3809 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3810 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3811 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3812 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3813 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3814 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3815 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3816 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3817 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3818 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3819 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3820 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3821 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3822 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3823 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3826 Version 1.18.0 (2017-06-08)
3827 ===========================
3832 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3833 make the item visible to just that module tree. Also accepts the keyword
3834 `crate` to make something public to the whole crate but not users of the
3835 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3836 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3837 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3838 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3839 types like `Write + Send`, trailing `+` are now supported in trait objects,
3840 and better error reporting for trait objects starting with `?Sized`.
3841 - [0e+10 is now a valid floating point literal][40589]
3842 - [Now warns if you bind a lifetime parameter to 'static][40734]
3843 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3844 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3845 representation in some cases.][40377]
3850 - [rustc can now emit mir with `--emit mir`][39891]
3851 - [Improved LLVM IR for trivial functions][40367]
3852 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3853 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3854 opportunities found through profiling
3855 - [Improved backtrace formatting when panicking][38165]
3860 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3861 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3862 iteration or reallocation.
3863 - [Simplified HashMap Bucket interface][40561] provides performance
3864 improvements for iterating and cloning.
3865 - [Specialize Vec::from_elem to use calloc][40409]
3866 - [Fixed Race condition in fs::create_dir_all][39799]
3867 - [No longer caching stdio on Windows][40516]
3868 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3869 2.50%~ faster and in one case now 12.50% faster.
3870 - [Optimized `AtomicBool::fetch_nand`][41143]
3875 - [`Child::try_wait`]
3876 - [`HashMap::retain`]
3877 - [`HashSet::retain`]
3879 - [`TcpStream::peek`]
3880 - [`UdpSocket::peek`]
3881 - [`UdpSocket::peek_from`]
3886 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3887 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3888 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3889 - [Added Android build support][cargo/3885]
3890 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3891 of a certain type, for example `cargo build --bins` will build all
3893 - [Added support for haiku][cargo/3952]
3898 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3899 - [Added rust-windbg script for better debugging on Windows][39983]
3900 - [Rust now uses the official cross compiler for NetBSD][40612]
3901 - [rustdoc now accepts `#` at the start of files][40828]
3902 - [Fixed jemalloc support for musl][41168]
3907 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3908 always placed after the sign if it exists and before the digits. With the `#`
3909 flag the zeroes are placed after the prefix and before the digits.
3910 - [Due to the struct field optimisation][40377], using `transmute` on structs
3911 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3912 always been undefined behavior, but is now more likely to break in practice.
3913 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3914 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3915 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3916 - [Overlapping inherent `impl`s are now a hard error][40728]
3917 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3918 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3919 `out.asm` and `out.ll` instead of only one of the filetypes.
3920 - [ calling a function that returns `Self` will no longer work][41805] when
3921 the size of `Self` cannot be statically determined.
3922 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3923 this has caused a few regressions namely:
3925 - Changed the link order of local static/dynamic libraries (respecting the
3926 order on given rather than having the compiler reorder).
3927 - Changed how MinGW is linked, native code linked to dynamic libraries
3928 may require manually linking to the gcc support library (for the native
3931 [38165]: https://github.com/rust-lang/rust/pull/38165
3932 [39799]: https://github.com/rust-lang/rust/pull/39799
3933 [39891]: https://github.com/rust-lang/rust/pull/39891
3934 [39983]: https://github.com/rust-lang/rust/pull/39983
3935 [40043]: https://github.com/rust-lang/rust/pull/40043
3936 [40241]: https://github.com/rust-lang/rust/pull/40241
3937 [40338]: https://github.com/rust-lang/rust/pull/40338
3938 [40367]: https://github.com/rust-lang/rust/pull/40367
3939 [40377]: https://github.com/rust-lang/rust/pull/40377
3940 [40409]: https://github.com/rust-lang/rust/pull/40409
3941 [40516]: https://github.com/rust-lang/rust/pull/40516
3942 [40556]: https://github.com/rust-lang/rust/pull/40556
3943 [40561]: https://github.com/rust-lang/rust/pull/40561
3944 [40589]: https://github.com/rust-lang/rust/pull/40589
3945 [40612]: https://github.com/rust-lang/rust/pull/40612
3946 [40723]: https://github.com/rust-lang/rust/pull/40723
3947 [40728]: https://github.com/rust-lang/rust/pull/40728
3948 [40731]: https://github.com/rust-lang/rust/pull/40731
3949 [40734]: https://github.com/rust-lang/rust/pull/40734
3950 [40805]: https://github.com/rust-lang/rust/pull/40805
3951 [40807]: https://github.com/rust-lang/rust/pull/40807
3952 [40828]: https://github.com/rust-lang/rust/pull/40828
3953 [40870]: https://github.com/rust-lang/rust/pull/40870
3954 [41085]: https://github.com/rust-lang/rust/pull/41085
3955 [41143]: https://github.com/rust-lang/rust/pull/41143
3956 [41168]: https://github.com/rust-lang/rust/pull/41168
3957 [41270]: https://github.com/rust-lang/rust/issues/41270
3958 [41469]: https://github.com/rust-lang/rust/pull/41469
3959 [41805]: https://github.com/rust-lang/rust/issues/41805
3960 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3961 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3962 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3963 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3964 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3965 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3966 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3967 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3968 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3969 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3970 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3971 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3972 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3973 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3976 Version 1.17.0 (2017-04-27)
3977 ===========================
3982 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3983 * [Fields of structs may be initialized without duplicating the field/variable
3984 names][39761]. [RFC 1682]
3985 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3986 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3987 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3988 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3989 `'b`. Soundness fix.
3990 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3991 * [Static variables may contain references to other statics][40027]
3996 * [Exit quickly on only `--emit dep-info`][40336]
3997 * [Make `-C relocation-model` more correctly determine whether the linker
3998 creates a position-independent executable][40245]
3999 * [Add `-C overflow-checks` to directly control whether integer overflow
4001 * [The rustc type checker now checks items on demand instead of in a single
4002 in-order pass][40008]. This is mostly an internal refactoring in support of
4003 future work, including incremental type checking, but also resolves [RFC
4004 1647], allowing `Self` to appear in `impl` `where` clauses.
4005 * [Optimize vtable loads][39995]
4006 * [Turn off vectorization for Emscripten targets][39990]
4007 * [Provide suggestions for unknown macros imported with `use`][39953]
4008 * [Fix ICEs in path resolution][39939]
4009 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4010 * [Add clearer error message using `&str + &str`][39116]
4021 * [`Ordering::then`]
4022 * [`Ordering::then_with`]
4023 * [`BTreeMap::range`]
4024 * [`BTreeMap::range_mut`]
4025 * [`collections::Bound`]
4026 * [`process::abort`]
4027 * [`ptr::read_unaligned`]
4028 * [`ptr::write_unaligned`]
4029 * [`Result::expect_err`]
4032 * [`Cell::into_inner`]
4038 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4039 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4040 * [`String` implements `FromIterator<&char>`][40028]
4041 * `Box` [implements][40009] a number of new conversions:
4042 `From<Box<str>> for String`,
4043 `From<Box<[T]>> for Vec<T>`,
4044 `From<Box<CStr>> for CString`,
4045 `From<Box<OsStr>> for OsString`,
4046 `From<Box<Path>> for PathBuf`,
4047 `Into<Box<str>> for String`,
4048 `Into<Box<[T]>> for Vec<T>`,
4049 `Into<Box<CStr>> for CString`,
4050 `Into<Box<OsStr>> for OsString`,
4051 `Into<Box<Path>> for PathBuf`,
4052 `Default for Box<str>`,
4053 `Default for Box<CStr>`,
4054 `Default for Box<OsStr>`,
4055 `From<&CStr> for Box<CStr>`,
4056 `From<&OsStr> for Box<OsStr>`,
4057 `From<&Path> for Box<Path>`
4058 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4059 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4060 * [Slightly optimize `slice::sort`][39538]
4061 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4062 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4063 `Box<str>` implements `From<&str>`][39438]
4064 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4065 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4066 * [`format!` estimates the needed capacity before writing a string][39356]
4067 * [Support unprivileged symlink creation in Windows][38921]
4068 * [`PathBuf` implements `Default`][38764]
4069 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4070 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4071 and poor hash functions.
4076 * [Add `cargo check --all`][cargo/3731]
4077 * [Add an option to ignore SSL revocation checking][cargo/3699]
4078 * [Add `cargo run --package`][cargo/3691]
4079 * [Add `required_features`][cargo/3667]
4080 * [Assume `build.rs` is a build script][cargo/3664]
4081 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4086 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4088 * [The "Unstable Book" documents nightly-only features][ubook]
4089 * [Improve the style of the sidebar in rustdoc output][40265]
4090 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4091 * [Fix MSP430 breakage due to `i128`][40257]
4092 * [Preliminary Solaris/SPARCv9 support][39903]
4093 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4094 run without installing the MSVC runtime.
4095 * [`rustdoc --test` includes file names in test names][39788]
4096 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4097 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4098 * [Initial support for `aarch64-unknown-freebsd`][39491]
4099 * [Initial support for `i686-unknown-netbsd`][39426]
4100 * [This release no longer includes the old makefile build system][39431]. Rust
4101 is built with a custom build system, written in Rust, and with Cargo.
4102 * [Add Debug implementations for libcollection structs][39002]
4103 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4104 * [`--test-threads=0` produces an error][38945]
4105 * [`rustup` installs documentation by default][40526]
4106 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4107 WinDbg and Visual Studio to improve the debugging experience.
4112 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4113 workaround, either use MSVC 2015 or run vcvars.bat.
4114 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4115 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4116 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4118 * [`format!` and `Display::to_string` panic if an underlying formatting
4119 implementation returns an error][40117]. Previously the error was silently
4120 ignored. It is incorrect for `write_fmt` to return an error when writing
4122 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4123 crates were marked stable and could be accessed from the stable toolchain.
4124 * [Rust git source no longer includes vendored crates][39728]. Those that need
4125 to build with vendored crates should build from release tarballs.
4126 * [Fix inert attributes from `proc_macro_derives`][39572]
4127 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4128 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4130 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4131 existing code generally ignores the type of dead-code unless a type-hint is
4132 provided; this can cause surprising inference interactions particularly around
4133 defaulting. The new code uniformly ignores the result type of dead-code.
4134 * [Tuple-struct constructors with private fields are no longer visible][38932]
4135 * [Lifetime parameters that do not appear in the arguments are now considered
4136 early-bound][38897], resolving a soundness bug (#[32330]). The
4137 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4139 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4140 * [Make transmuting from fn item types to pointer-sized types a hard
4143 [27787]: https://github.com/rust-lang/rust/issues/27787
4144 [32330]: https://github.com/rust-lang/rust/issues/32330
4145 [34198]: https://github.com/rust-lang/rust/pull/34198
4146 [38161]: https://github.com/rust-lang/rust/pull/38161
4147 [38368]: https://github.com/rust-lang/rust/pull/38368
4148 [38584]: https://github.com/rust-lang/rust/issues/38584
4149 [38661]: https://github.com/rust-lang/rust/pull/38661
4150 [38764]: https://github.com/rust-lang/rust/pull/38764
4151 [38864]: https://github.com/rust-lang/rust/issues/38864
4152 [38897]: https://github.com/rust-lang/rust/pull/38897
4153 [38921]: https://github.com/rust-lang/rust/pull/38921
4154 [38932]: https://github.com/rust-lang/rust/pull/38932
4155 [38945]: https://github.com/rust-lang/rust/pull/38945
4156 [38981]: https://github.com/rust-lang/rust/pull/38981
4157 [39002]: https://github.com/rust-lang/rust/pull/39002
4158 [39116]: https://github.com/rust-lang/rust/pull/39116
4159 [39193]: https://github.com/rust-lang/rust/pull/39193
4160 [39265]: https://github.com/rust-lang/rust/pull/39265
4161 [39356]: https://github.com/rust-lang/rust/pull/39356
4162 [39372]: https://github.com/rust-lang/rust/pull/39372
4163 [39426]: https://github.com/rust-lang/rust/pull/39426
4164 [39431]: https://github.com/rust-lang/rust/pull/39431
4165 [39438]: https://github.com/rust-lang/rust/pull/39438
4166 [39440]: https://github.com/rust-lang/rust/pull/39440
4167 [39485]: https://github.com/rust-lang/rust/pull/39485
4168 [39491]: https://github.com/rust-lang/rust/pull/39491
4169 [39518]: https://github.com/rust-lang/rust/pull/39518
4170 [39538]: https://github.com/rust-lang/rust/pull/39538
4171 [39572]: https://github.com/rust-lang/rust/pull/39572
4172 [39633]: https://github.com/rust-lang/rust/pull/39633
4173 [39642]: https://github.com/rust-lang/rust/pull/39642
4174 [39728]: https://github.com/rust-lang/rust/pull/39728
4175 [39761]: https://github.com/rust-lang/rust/pull/39761
4176 [39788]: https://github.com/rust-lang/rust/pull/39788
4177 [39793]: https://github.com/rust-lang/rust/pull/39793
4178 [39837]: https://github.com/rust-lang/rust/pull/39837
4179 [39843]: https://github.com/rust-lang/rust/pull/39843
4180 [39851]: https://github.com/rust-lang/rust/pull/39851
4181 [39903]: https://github.com/rust-lang/rust/pull/39903
4182 [39939]: https://github.com/rust-lang/rust/pull/39939
4183 [39953]: https://github.com/rust-lang/rust/pull/39953
4184 [39960]: https://github.com/rust-lang/rust/pull/39960
4185 [39990]: https://github.com/rust-lang/rust/pull/39990
4186 [39995]: https://github.com/rust-lang/rust/pull/39995
4187 [40008]: https://github.com/rust-lang/rust/pull/40008
4188 [40009]: https://github.com/rust-lang/rust/pull/40009
4189 [40027]: https://github.com/rust-lang/rust/pull/40027
4190 [40028]: https://github.com/rust-lang/rust/pull/40028
4191 [40037]: https://github.com/rust-lang/rust/pull/40037
4192 [40117]: https://github.com/rust-lang/rust/pull/40117
4193 [40166]: https://github.com/rust-lang/rust/pull/40166
4194 [40245]: https://github.com/rust-lang/rust/pull/40245
4195 [40257]: https://github.com/rust-lang/rust/pull/40257
4196 [40261]: https://github.com/rust-lang/rust/pull/40261
4197 [40265]: https://github.com/rust-lang/rust/pull/40265
4198 [40319]: https://github.com/rust-lang/rust/pull/40319
4199 [40336]: https://github.com/rust-lang/rust/pull/40336
4200 [40526]: https://github.com/rust-lang/rust/pull/40526
4201 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4202 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4203 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4204 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4205 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4206 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4207 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4208 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4209 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4210 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4211 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4212 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4213 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4214 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4215 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4216 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4217 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4218 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4219 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4220 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4221 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4222 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4223 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4224 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4225 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4226 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4227 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4228 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4229 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4230 [mdbook]: https://crates.io/crates/mdbook
4231 [ubook]: https://doc.rust-lang.org/unstable-book/
4234 Version 1.16.0 (2017-03-16)
4235 ===========================
4240 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4241 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4242 match patterns][38069]
4243 * [Clean up semantics of `self` in an import list][38313]
4244 * [`Self` may appear in `impl` headers][38920]
4245 * [`Self` may appear in struct expressions][39282]
4250 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4251 a `.rmeta` file containing only crate metadata][38571]. This can be
4252 used by tools like the Rust Language Service to perform
4253 metadata-only builds.
4254 * [Levenshtein based typo suggestions now work in most places, while
4255 previously they worked only for fields and sometimes for local
4256 variables][38927]. Together with the overhaul of "no
4257 resolution"/"unexpected resolution" errors (#[38154]) they result in
4258 large and systematic improvement in resolution diagnostics.
4259 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4261 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4262 * [`rustc` no longer attempts to provide "consider using an explicit
4263 lifetime" suggestions][37057]. They were inaccurate.
4268 * [`VecDeque::truncate`]
4269 * [`VecDeque::resize`]
4270 * [`String::insert_str`]
4271 * [`Duration::checked_add`]
4272 * [`Duration::checked_sub`]
4273 * [`Duration::checked_div`]
4274 * [`Duration::checked_mul`]
4277 * [`SocketAddr::is_ipv4`]
4278 * [`SocketAddr::is_ipv6`]
4279 * [`IpAddr::is_ipv4`]
4280 * [`IpAddr::is_ipv6`]
4282 * [`Vec::dedup_by_key`]
4283 * [`Result::unwrap_or_default`]
4284 * [`<*const T>::wrapping_offset`]
4285 * [`<*mut T>::wrapping_offset`]
4286 * `CommandExt::creation_flags`
4287 * [`File::set_permissions`]
4288 * [`String::split_off`]
4293 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4294 their argument by `Borrow` parameter][37761]
4295 * [All public types in std implement `Debug`][38006]
4296 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4297 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4298 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4300 * [std: Fix partial writes in `LineWriter`][38062]
4301 * [std: Clamp max read/write sizes on Unix][38062]
4302 * [Use more specific panic message for `&str` slicing errors][38066]
4303 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4304 functionality cannot be achieved in std currently.
4305 * [`writeln!`, like `println!`, now accepts a form with no string
4306 or formatting arguments, to just print a newline][38469]
4307 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4308 * [Reduce the size of static data in `std_unicode::tables`][38781]
4309 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4310 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4312 * [`Duration` implements `Sum`][38712]
4313 * [`String` implements `ToSocketAddrs`][39048]
4318 * [The `cargo check` command does a type check of a project without
4319 building it][cargo/3296]
4320 * [crates.io will display CI badges from Travis and AppVeyor, if
4321 specified in Cargo.toml][cargo/3546]
4322 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4323 * [Compilation profiles accept integer values for `debug`, in addition
4324 to `true` and `false`. These are passed to `rustc` as the value to
4325 `-C debuginfo`][cargo/3534]
4326 * [Implement `cargo --version --verbose`][cargo/3604]
4327 * [All builds now output 'dep-info' build dependencies compatible with
4328 make and ninja][cargo/3557]
4329 * [Build all workspace members with `build --all`][cargo/3511]
4330 * [Document all workspace members with `doc --all`][cargo/3515]
4331 * [Path deps outside workspace are not members][cargo/3443]
4336 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4337 the path to the Rust implementation][38589]
4338 * [The `armv7-linux-androideabi` target no longer enables NEON
4339 extensions, per Google's ABI guide][38413]
4340 * [The stock standard library can be compiled for Redox OS][38401]
4341 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4343 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4345 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4350 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4351 match patterns][38069]
4352 * In this release, references to uninhabited types can not be
4353 pattern-matched. This was accidentally allowed in 1.15.
4354 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4355 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4357 * [Clean up semantics of `self` in an import list][38313]
4358 * Reimplemented lifetime elision. This change was almost entirely compatible
4359 with existing code, but it did close a number of small bugs and loopholes,
4360 as well as being more accepting in some other [cases][41105].
4362 [37057]: https://github.com/rust-lang/rust/pull/37057
4363 [37761]: https://github.com/rust-lang/rust/pull/37761
4364 [38006]: https://github.com/rust-lang/rust/pull/38006
4365 [38051]: https://github.com/rust-lang/rust/pull/38051
4366 [38062]: https://github.com/rust-lang/rust/pull/38062
4367 [38062]: https://github.com/rust-lang/rust/pull/38622
4368 [38066]: https://github.com/rust-lang/rust/pull/38066
4369 [38069]: https://github.com/rust-lang/rust/pull/38069
4370 [38131]: https://github.com/rust-lang/rust/pull/38131
4371 [38154]: https://github.com/rust-lang/rust/pull/38154
4372 [38274]: https://github.com/rust-lang/rust/pull/38274
4373 [38304]: https://github.com/rust-lang/rust/pull/38304
4374 [38313]: https://github.com/rust-lang/rust/pull/38313
4375 [38314]: https://github.com/rust-lang/rust/pull/38314
4376 [38327]: https://github.com/rust-lang/rust/pull/38327
4377 [38401]: https://github.com/rust-lang/rust/pull/38401
4378 [38413]: https://github.com/rust-lang/rust/pull/38413
4379 [38469]: https://github.com/rust-lang/rust/pull/38469
4380 [38559]: https://github.com/rust-lang/rust/pull/38559
4381 [38571]: https://github.com/rust-lang/rust/pull/38571
4382 [38580]: https://github.com/rust-lang/rust/pull/38580
4383 [38589]: https://github.com/rust-lang/rust/pull/38589
4384 [38670]: https://github.com/rust-lang/rust/pull/38670
4385 [38712]: https://github.com/rust-lang/rust/pull/38712
4386 [38726]: https://github.com/rust-lang/rust/pull/38726
4387 [38781]: https://github.com/rust-lang/rust/pull/38781
4388 [38798]: https://github.com/rust-lang/rust/pull/38798
4389 [38909]: https://github.com/rust-lang/rust/pull/38909
4390 [38920]: https://github.com/rust-lang/rust/pull/38920
4391 [38927]: https://github.com/rust-lang/rust/pull/38927
4392 [39048]: https://github.com/rust-lang/rust/pull/39048
4393 [39282]: https://github.com/rust-lang/rust/pull/39282
4394 [39379]: https://github.com/rust-lang/rust/pull/39379
4395 [41105]: https://github.com/rust-lang/rust/issues/41105
4396 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4397 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4398 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4399 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4400 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4401 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4402 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4403 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4404 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4405 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4406 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4407 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4408 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4409 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4410 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4411 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4412 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4413 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4414 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4415 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4416 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4417 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4418 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4419 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4420 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4421 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4422 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4423 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4424 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4425 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4428 Version 1.15.1 (2017-02-09)
4429 ===========================
4431 * [Fix IntoIter::as_mut_slice's signature][39466]
4432 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4434 [39466]: https://github.com/rust-lang/rust/pull/39466
4435 [39523]: https://github.com/rust-lang/rust/pull/39523
4438 Version 1.15.0 (2017-02-02)
4439 ===========================
4444 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4445 stable. This allows popular code-generating crates like Serde and Diesel to
4446 work ergonomically. [RFC 1681].
4447 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4448 with curly braces][36868]. Part of [RFC 1506].
4449 * [A number of minor changes to name resolution have been activated][37127].
4450 They add up to more consistent semantics, allowing for future evolution of
4451 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4452 details of what is different. The breaking changes here have been transitioned
4453 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4454 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4456 * [`?Sized` can be used in `where` clauses][37791]
4457 * [There is now a limit on the size of monomorphized types and it can be
4458 modified with the `#![type_size_limit]` crate attribute, similarly to
4459 the `#![recursion_limit]` attribute][37789]
4464 * [On Windows, the compiler will apply dllimport attributes when linking to
4465 extern functions][37973]. Additional attributes and flags can control which
4466 library kind is linked and its name. [RFC 1717].
4467 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4468 * [The `--test` flag works with procedural macro crates][38107]
4469 * [Fix `extern "aapcs" fn` ABI][37814]
4470 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4471 * [The `format!` expander recognizes incorrect `printf` and shell-style
4472 formatting directives and suggests the correct format][37613].
4473 * [Only report one error for all unused imports in an import list][37456]
4475 Compiler Performance
4476 --------------------
4478 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4479 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4480 * [Don't clone in `UnificationTable::probe`][37848]
4481 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4482 * [Use small vectors in type walker][37760]
4483 * [Macro expansion performance was improved][37701]
4484 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4485 * [Replace FNV with a faster hash function][37229]
4490 * [`std::iter::Iterator::min_by`]
4491 * [`std::iter::Iterator::max_by`]
4492 * [`std::os::*::fs::FileExt`]
4493 * [`std::sync::atomic::Atomic*::get_mut`]
4494 * [`std::sync::atomic::Atomic*::into_inner`]
4495 * [`std::vec::IntoIter::as_slice`]
4496 * [`std::vec::IntoIter::as_mut_slice`]
4497 * [`std::sync::mpsc::Receiver::try_iter`]
4498 * [`std::os::unix::process::CommandExt::before_exec`]
4499 * [`std::rc::Rc::strong_count`]
4500 * [`std::rc::Rc::weak_count`]
4501 * [`std::sync::Arc::strong_count`]
4502 * [`std::sync::Arc::weak_count`]
4503 * [`std::char::encode_utf8`]
4504 * [`std::char::encode_utf16`]
4505 * [`std::cell::Ref::clone`]
4506 * [`std::io::Take::into_inner`]
4511 * [The standard sorting algorithm has been rewritten for dramatic performance
4512 improvements][38192]. It is a hybrid merge sort, drawing influences from
4513 Timsort. Previously it was a naive merge sort.
4514 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4515 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4517 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4518 and `char_indices().last()`][37882]
4519 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4520 * [Chinese characters display correctly in `fmt::Debug`][37855]
4521 * [Derive `Default` for `Duration`][37699]
4522 * [Support creation of anonymous pipes on WinXP/2k][37677]
4523 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4524 * [Don't pass overlapped handles to processes][38835]
4529 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4530 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4531 should instead check the variable at runtime with `std::env`. That the value
4532 was set at build time was a bug, and incorrect when cross-compiling. This
4533 change is known to cause breakage.
4534 * [Add `--all` flag to `cargo test`][cargo/3221]
4535 * [Compile statically against the MSVC CRT][cargo/3363]
4536 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4537 * [Link OpenSSL statically on OSX][cargo/3311]
4538 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4539 * [Test for bad path overrides with summaries][cargo/3336]
4540 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4541 * [Fix retrying crate downloads for network errors][cargo/3348]
4542 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4543 * [Emit more info on --message-format=json][cargo/3319]
4544 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4545 * [Don't ignore errors in workspace manifest][cargo/3409]
4546 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4551 * [Test runners (binaries built with `--test`) now support a `--list` argument
4552 that lists the tests it contains][38185]
4553 * [Test runners now support a `--exact` argument that makes the test filter
4554 match exactly, instead of matching only a substring of the test name][38181]
4555 * [rustdoc supports a `--playground-url` flag][37763]
4556 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4561 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4562 continue to be used in this release by passing `--disable-rustbuild` to the
4563 configure script, but they will be deleted soon. Note that the new build
4564 system uses a different on-disk layout that will likely affect any scripts
4566 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4568 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4569 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4575 * [A number of minor changes to name resolution have been activated][37127].
4576 They add up to more consistent semantics, allowing for future evolution of
4577 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4578 details of what is different. The breaking changes here have been transitioned
4579 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4580 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4581 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4582 should instead check the variable at runtime with `std::env`. That the value
4583 was set at build time was a bug, and incorrect when cross-compiling. This
4584 change is known to cause breakage.
4585 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4586 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4587 1.10 and is now an error by default. It will become a hard error in the near
4589 * [The semantics relating modules to file system directories are changing in
4590 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4591 lint, which is a warning in this release, and will become a hard error in the
4593 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4594 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4595 the underlying iterator][37834]
4597 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4598 [33685]: https://github.com/rust-lang/rust/issues/33685
4599 [36868]: https://github.com/rust-lang/rust/pull/36868
4600 [37127]: https://github.com/rust-lang/rust/pull/37127
4601 [37229]: https://github.com/rust-lang/rust/pull/37229
4602 [37456]: https://github.com/rust-lang/rust/pull/37456
4603 [37527]: https://github.com/rust-lang/rust/pull/37527
4604 [37602]: https://github.com/rust-lang/rust/pull/37602
4605 [37613]: https://github.com/rust-lang/rust/pull/37613
4606 [37615]: https://github.com/rust-lang/rust/pull/37615
4607 [37636]: https://github.com/rust-lang/rust/pull/37636
4608 [37627]: https://github.com/rust-lang/rust/pull/37627
4609 [37642]: https://github.com/rust-lang/rust/pull/37642
4610 [37677]: https://github.com/rust-lang/rust/pull/37677
4611 [37699]: https://github.com/rust-lang/rust/pull/37699
4612 [37701]: https://github.com/rust-lang/rust/pull/37701
4613 [37705]: https://github.com/rust-lang/rust/pull/37705
4614 [37749]: https://github.com/rust-lang/rust/pull/37749
4615 [37760]: https://github.com/rust-lang/rust/pull/37760
4616 [37763]: https://github.com/rust-lang/rust/pull/37763
4617 [37764]: https://github.com/rust-lang/rust/pull/37764
4618 [37789]: https://github.com/rust-lang/rust/pull/37789
4619 [37791]: https://github.com/rust-lang/rust/pull/37791
4620 [37814]: https://github.com/rust-lang/rust/pull/37814
4621 [37817]: https://github.com/rust-lang/rust/pull/37817
4622 [37834]: https://github.com/rust-lang/rust/pull/37834
4623 [37848]: https://github.com/rust-lang/rust/pull/37848
4624 [37855]: https://github.com/rust-lang/rust/pull/37855
4625 [37882]: https://github.com/rust-lang/rust/pull/37882
4626 [37888]: https://github.com/rust-lang/rust/pull/37888
4627 [37973]: https://github.com/rust-lang/rust/pull/37973
4628 [37979]: https://github.com/rust-lang/rust/pull/37979
4629 [38086]: https://github.com/rust-lang/rust/pull/38086
4630 [38107]: https://github.com/rust-lang/rust/pull/38107
4631 [38117]: https://github.com/rust-lang/rust/pull/38117
4632 [38134]: https://github.com/rust-lang/rust/pull/38134
4633 [38146]: https://github.com/rust-lang/rust/pull/38146
4634 [38181]: https://github.com/rust-lang/rust/pull/38181
4635 [38182]: https://github.com/rust-lang/rust/pull/38182
4636 [38185]: https://github.com/rust-lang/rust/pull/38185
4637 [38192]: https://github.com/rust-lang/rust/pull/38192
4638 [38279]: https://github.com/rust-lang/rust/pull/38279
4639 [38835]: https://github.com/rust-lang/rust/pull/38835
4640 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4641 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4642 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4643 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4644 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4645 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4646 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4647 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4648 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4649 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4650 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4651 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4652 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4653 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4654 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4655 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4656 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4657 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4658 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4659 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4660 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4661 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4662 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4663 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4664 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4665 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4666 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4667 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4668 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4669 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4670 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4671 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4672 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4673 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4674 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4675 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4676 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4677 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4680 Version 1.14.0 (2016-12-22)
4681 ===========================
4686 * [`..` matches multiple tuple fields in enum variants, structs
4687 and tuples][36843]. [RFC 1492].
4688 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4689 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4690 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4691 dereferencing][36822]
4696 * [Mark enums with non-zero discriminant as non-zero][37224]
4697 * [Lower-case `static mut` names are linted like other
4698 statics and consts][37162]
4699 * [Fix ICE on some macros in const integer positions
4700 (e.g. `[u8; m!()]`)][36819]
4701 * [Improve error message and snippet for "did you mean `x`"][36798]
4702 * [Add a panic-strategy field to the target specification][36794]
4703 * [Include LLVM version in `--version --verbose`][37200]
4705 Compile-time Optimizations
4706 --------------------------
4708 * [Improve macro expansion performance][37569]
4709 * [Shrink `Expr_::ExprInlineAsm`][37445]
4710 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4711 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4712 * [Avoid more allocations when compiling html5ever][37373]
4713 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4714 * [Avoid some allocations in the macro parser][37318]
4715 * [Use a faster deflate setting][37298]
4716 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4717 during interning of slices][37270]
4718 * [Optimize `write_metadata`][37267]
4719 * [Don't process obligation forest cycles when stalled][37231]
4720 * [Avoid many `CrateConfig` clones][37161]
4721 * [Optimize `Substs::super_fold_with`][37108]
4722 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4723 * [Speed up `plug_leaks`][36917]
4728 * [`println!()`, with no arguments, prints newline][36825].
4729 Previously, an empty string was required to achieve the same.
4730 * [`Wrapping` impls standard binary and unary operators, as well as
4731 the `Sum` and `Product` iterators][37356]
4732 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4734 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4735 `VecDeque` iterators][37315]
4736 * [Improve `SipHasher` performance on small values][37312]
4737 * [Add Iterator trait TrustedLen to enable better FromIterator /
4739 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4740 * [`ReadDir` implements `Debug`][37221]
4741 * [Implement `RefUnwindSafe` for atomic types][37178]
4742 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4743 * [Avoid allocations in `Decoder::read_str`][37064]
4744 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4745 * [Impl `Debug` for raw pointers to unsized data][36880]
4746 * [Don't reuse `HashMap` random seeds][37470]
4747 * [The internal memory layout of `HashMap` is more cache-friendly, for
4748 significant improvements in some operations][36692]
4749 * [`HashMap` uses less memory on 32-bit architectures][36595]
4750 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4755 * [Expose rustc cfg values to build scripts][cargo/3243]
4756 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4757 * [Fix passing --features when testing multiple packages][cargo/3280]
4758 * [Use a single profile set per workspace][cargo/3249]
4759 * [Load `replace` sections from lock files][cargo/3220]
4760 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4765 * [rustup is the recommended Rust installation method][1.14rustup]
4766 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4767 S390x. These are [tier 2] platforms and may have major defects. Follow the
4768 instructions on the website to install, or add the targets to an existing
4769 installation with `rustup target add`. The new target triples are:
4770 - `mips-unknown-linux-gnu`
4771 - `mipsel-unknown-linux-gnu`
4772 - `mips64-unknown-linux-gnuabi64`
4773 - `mips64el-unknown-linux-gnuabi64 `
4774 - `powerpc-unknown-linux-gnu`
4775 - `powerpc64-unknown-linux-gnu`
4776 - `powerpc64le-unknown-linux-gnu`
4777 - `s390x-unknown-linux-gnu `
4778 * This release includes target (std) builds for ARM Linux running MUSL
4779 libc. These are [tier 2] platforms and may have major defects. Add the
4780 following triples to an existing rustup installation with `rustup target add`:
4781 - `arm-unknown-linux-musleabi`
4782 - `arm-unknown-linux-musleabihf`
4783 - `armv7-unknown-linux-musleabihf`
4784 * This release includes [experimental support for WebAssembly][1.14wasm], via
4785 the `wasm32-unknown-emscripten` target. This target is known to have major
4786 defects. Please test, report, and fix.
4787 * rustup no longer installs documentation by default. Run `rustup
4788 component add rust-docs` to install.
4789 * [Fix line stepping in debugger][37310]
4790 * [Enable line number debuginfo in releases][37280]
4795 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4796 * [Add support for Fuchsia OS][37313]
4797 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4802 * [A number of forward-compatibility lints used by the compiler
4803 to gradually introduce language changes have been converted
4804 to deny by default][36894]:
4805 - ["use of inaccessible extern crate erroneously allowed"][36886]
4806 - ["type parameter default erroneously allowed in invalid location"][36887]
4807 - ["detects super or self keywords at the beginning of global path"][36888]
4808 - ["two overlapping inherent impls define an item with the same name
4809 were erroneously allowed"][36889]
4810 - ["floating-point constants cannot be used in patterns"][36890]
4811 - ["constants of struct or enum type can only be used in a pattern if
4812 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4813 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4814 * [Prohibit patterns in trait methods without bodies][37378]
4815 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4816 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4817 * [The `$crate` macro variable is accepted in fewer locations][37213]
4818 * [Impls specifying extra region requirements beyond the trait
4819 they implement are rejected][37167]
4820 * [Enums may not be unsized][37111]. Unsized enums are intended to
4821 work but never have. For now they are forbidden.
4822 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4824 [tier 2]: https://forge.rust-lang.org/platform-support.html
4825 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4826 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4827 [36430]: https://github.com/rust-lang/rust/pull/36430
4828 [36595]: https://github.com/rust-lang/rust/pull/36595
4829 [36595]: https://github.com/rust-lang/rust/pull/36595
4830 [36692]: https://github.com/rust-lang/rust/pull/36692
4831 [36767]: https://github.com/rust-lang/rust/pull/36767
4832 [36794]: https://github.com/rust-lang/rust/pull/36794
4833 [36798]: https://github.com/rust-lang/rust/pull/36798
4834 [36819]: https://github.com/rust-lang/rust/pull/36819
4835 [36822]: https://github.com/rust-lang/rust/pull/36822
4836 [36825]: https://github.com/rust-lang/rust/pull/36825
4837 [36843]: https://github.com/rust-lang/rust/pull/36843
4838 [36880]: https://github.com/rust-lang/rust/pull/36880
4839 [36886]: https://github.com/rust-lang/rust/issues/36886
4840 [36887]: https://github.com/rust-lang/rust/issues/36887
4841 [36888]: https://github.com/rust-lang/rust/issues/36888
4842 [36889]: https://github.com/rust-lang/rust/issues/36889
4843 [36890]: https://github.com/rust-lang/rust/issues/36890
4844 [36891]: https://github.com/rust-lang/rust/issues/36891
4845 [36892]: https://github.com/rust-lang/rust/issues/36892
4846 [36894]: https://github.com/rust-lang/rust/pull/36894
4847 [36917]: https://github.com/rust-lang/rust/pull/36917
4848 [36993]: https://github.com/rust-lang/rust/pull/36993
4849 [37037]: https://github.com/rust-lang/rust/pull/37037
4850 [37064]: https://github.com/rust-lang/rust/pull/37064
4851 [37094]: https://github.com/rust-lang/rust/pull/37094
4852 [37108]: https://github.com/rust-lang/rust/pull/37108
4853 [37111]: https://github.com/rust-lang/rust/pull/37111
4854 [37161]: https://github.com/rust-lang/rust/pull/37161
4855 [37162]: https://github.com/rust-lang/rust/pull/37162
4856 [37167]: https://github.com/rust-lang/rust/pull/37167
4857 [37178]: https://github.com/rust-lang/rust/pull/37178
4858 [37200]: https://github.com/rust-lang/rust/pull/37200
4859 [37213]: https://github.com/rust-lang/rust/pull/37213
4860 [37221]: https://github.com/rust-lang/rust/pull/37221
4861 [37224]: https://github.com/rust-lang/rust/pull/37224
4862 [37230]: https://github.com/rust-lang/rust/pull/37230
4863 [37231]: https://github.com/rust-lang/rust/pull/37231
4864 [37247]: https://github.com/rust-lang/rust/pull/37247
4865 [37267]: https://github.com/rust-lang/rust/pull/37267
4866 [37270]: https://github.com/rust-lang/rust/pull/37270
4867 [37273]: https://github.com/rust-lang/rust/pull/37273
4868 [37280]: https://github.com/rust-lang/rust/pull/37280
4869 [37298]: https://github.com/rust-lang/rust/pull/37298
4870 [37306]: https://github.com/rust-lang/rust/pull/37306
4871 [37310]: https://github.com/rust-lang/rust/pull/37310
4872 [37312]: https://github.com/rust-lang/rust/pull/37312
4873 [37313]: https://github.com/rust-lang/rust/pull/37313
4874 [37315]: https://github.com/rust-lang/rust/pull/37315
4875 [37318]: https://github.com/rust-lang/rust/pull/37318
4876 [37322]: https://github.com/rust-lang/rust/pull/37322
4877 [37326]: https://github.com/rust-lang/rust/pull/37326
4878 [37351]: https://github.com/rust-lang/rust/pull/37351
4879 [37356]: https://github.com/rust-lang/rust/pull/37356
4880 [37367]: https://github.com/rust-lang/rust/pull/37367
4881 [37373]: https://github.com/rust-lang/rust/pull/37373
4882 [37378]: https://github.com/rust-lang/rust/pull/37378
4883 [37389]: https://github.com/rust-lang/rust/pull/37389
4884 [37392]: https://github.com/rust-lang/rust/pull/37392
4885 [37427]: https://github.com/rust-lang/rust/pull/37427
4886 [37439]: https://github.com/rust-lang/rust/pull/37439
4887 [37445]: https://github.com/rust-lang/rust/pull/37445
4888 [37470]: https://github.com/rust-lang/rust/pull/37470
4889 [37569]: https://github.com/rust-lang/rust/pull/37569
4890 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4891 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4892 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4893 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4894 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4895 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4896 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4899 Version 1.13.0 (2016-11-10)
4900 ===========================
4905 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4906 errors, like the `try!` macro, described in [RFC 0243].
4907 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4908 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4909 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4910 * [Fix lifetime rules for 'if' conditions][36029]
4911 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4916 * [Add the `-C link-arg` argument][36574]
4917 * [Remove the old AST-based backend from rustc_trans][35764]
4918 * [Don't enable NEON by default on armv7 Linux][35814]
4919 * [Fix debug line number info for macro expansions][35238]
4920 * [Do not emit "class method" debuginfo for types that are not
4921 DICompositeType][36008]
4922 * [Warn about multiple conflicting #[repr] hints][34623]
4923 * [When sizing DST, don't double-count nested struct prefixes][36351]
4924 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4925 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4926 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4927 * [Expand macros without recursing to avoid stack overflows][36214]
4932 * [Replace macro backtraces with labeled local uses][35702]
4933 * [Improve error message for misplaced doc comments][33922]
4934 * [Buffer unix and lock windows to prevent message interleaving][35975]
4935 * [Update lifetime errors to specifically note temporaries][36171]
4936 * [Special case a few colors for Windows][36178]
4937 * [Suggest `use self` when such an import resolves][36289]
4938 * [Be more specific when type parameter shadows primitive type][36338]
4939 * Many minor improvements
4941 Compile-time Optimizations
4942 --------------------------
4944 * [Compute and cache HIR hashes at beginning][35854]
4945 * [Don't hash types in loan paths][36004]
4946 * [Cache projections in trans][35761]
4947 * [Optimize the parser's last token handling][36527]
4948 * [Only instantiate #[inline] functions in codegen units referencing
4949 them][36524]. This leads to big improvements in cases where crates export
4950 define many inline functions without using them directly.
4951 * [Lazily allocate TypedArena's first chunk][36592]
4952 * [Don't allocate during default HashSet creation][36734]
4959 * [`overflowing_abs`]
4960 * [`RefCell::try_borrow`]
4961 * [`RefCell::try_borrow_mut`]
4966 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4967 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4969 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4970 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4971 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4972 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4973 * [Use arc4rand on FreeBSD][35884]
4974 * [memrchr: Correct aligned offset computation][35969]
4975 * [Improve Demangling of Rust Symbols][36059]
4976 * [Use monotonic time in condition variables][35048]
4977 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4978 * [Implement conversion traits for `char`][35755]
4979 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4980 * [Zero first byte of CString on drop][36264]
4981 * [Inherit overflow checks for sum and product][36372]
4982 * [Add missing Eq implementations][36423]
4983 * [Implement `Debug` for `DirEntry`][36631]
4984 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4986 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4987 * [Implement more traits for `std::io::ErrorKind`][35911]
4988 * [Optimize BinaryHeap bounds checking][36072]
4989 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4990 `extend_with_element`][36355]
4991 * [Fix overflow checking in unsigned pow()][34942]
4996 * This release includes security fixes to both curl and OpenSSL.
4997 * [Fix transitive doctests when panic=abort][cargo/3021]
4998 * [Add --all-features flag to cargo][cargo/3038]
4999 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5000 * [Don't parse the home directory more than once][cargo/3078]
5001 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5002 * [Update OpenSSL to 1.0.2j][cargo/3121]
5003 * [Add license and license_file to cargo metadata output][cargo/3110]
5004 * [Make crates-io registry URL optional in config; ignore all changes to
5005 source.crates-io][cargo/3089]
5006 * [Don't download dependencies from other platforms][cargo/3123]
5007 * [Build transitive dev-dependencies when needed][cargo/3125]
5008 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5009 * [Avoid updating registry when adding existing deps][cargo/3144]
5010 * [Warn about path overrides that won't work][cargo/3136]
5011 * [Use workspaces during `cargo install`][cargo/3146]
5012 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5013 * [Add --message-format flag][cargo/3000]
5014 * [Pass target environment for rustdoc][cargo/3205]
5015 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5016 * [Update curl and curl-sys][cargo/3241]
5017 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5022 * [rustdoc: Add the `--sysroot` argument][36586]
5023 * [rustdoc: Fix a couple of issues with the search results][35655]
5024 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5025 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5026 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5031 * [Remove unmaintained style guide][35124]
5032 * [Add s390x support][36369]
5033 * [Initial work at Haiku OS support][36727]
5034 * [Add mips-uclibc targets][35734]
5035 * [Crate-ify compiler-rt into compiler-builtins][35021]
5036 * [Add rustc version info (git hash + date) to dist tarball][36213]
5037 * Many documentation improvements
5042 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5043 * [Deny (by default) transmuting from fn item types to pointer-sized
5044 types][34923]. Continuing the long transition to zero-sized fn items,
5046 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5048 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5049 * [Fix lifetime rules for 'if' conditions][36029].
5050 * [Inherit overflow checks for sum and product][36372].
5051 * [Forbid user-defined macros named "macro_rules"][36730].
5053 [33922]: https://github.com/rust-lang/rust/pull/33922
5054 [34623]: https://github.com/rust-lang/rust/pull/34623
5055 [34923]: https://github.com/rust-lang/rust/pull/34923
5056 [34942]: https://github.com/rust-lang/rust/pull/34942
5057 [34982]: https://github.com/rust-lang/rust/pull/34982
5058 [35021]: https://github.com/rust-lang/rust/pull/35021
5059 [35048]: https://github.com/rust-lang/rust/pull/35048
5060 [35074]: https://github.com/rust-lang/rust/pull/35074
5061 [35124]: https://github.com/rust-lang/rust/pull/35124
5062 [35234]: https://github.com/rust-lang/rust/pull/35234
5063 [35238]: https://github.com/rust-lang/rust/pull/35238
5064 [35354]: https://github.com/rust-lang/rust/pull/35354
5065 [35559]: https://github.com/rust-lang/rust/pull/35559
5066 [35585]: https://github.com/rust-lang/rust/pull/35585
5067 [35627]: https://github.com/rust-lang/rust/pull/35627
5068 [35655]: https://github.com/rust-lang/rust/pull/35655
5069 [35702]: https://github.com/rust-lang/rust/pull/35702
5070 [35707]: https://github.com/rust-lang/rust/pull/35707
5071 [35728]: https://github.com/rust-lang/rust/pull/35728
5072 [35734]: https://github.com/rust-lang/rust/pull/35734
5073 [35755]: https://github.com/rust-lang/rust/pull/35755
5074 [35761]: https://github.com/rust-lang/rust/pull/35761
5075 [35764]: https://github.com/rust-lang/rust/pull/35764
5076 [35814]: https://github.com/rust-lang/rust/pull/35814
5077 [35854]: https://github.com/rust-lang/rust/pull/35854
5078 [35871]: https://github.com/rust-lang/rust/pull/35871
5079 [35884]: https://github.com/rust-lang/rust/pull/35884
5080 [35911]: https://github.com/rust-lang/rust/pull/35911
5081 [35969]: https://github.com/rust-lang/rust/pull/35969
5082 [35975]: https://github.com/rust-lang/rust/pull/35975
5083 [36004]: https://github.com/rust-lang/rust/pull/36004
5084 [36008]: https://github.com/rust-lang/rust/pull/36008
5085 [36014]: https://github.com/rust-lang/rust/pull/36014
5086 [36029]: https://github.com/rust-lang/rust/pull/36029
5087 [36059]: https://github.com/rust-lang/rust/pull/36059
5088 [36072]: https://github.com/rust-lang/rust/pull/36072
5089 [36101]: https://github.com/rust-lang/rust/pull/36101
5090 [36104]: https://github.com/rust-lang/rust/pull/36104
5091 [36171]: https://github.com/rust-lang/rust/pull/36171
5092 [36173]: https://github.com/rust-lang/rust/pull/36173
5093 [36178]: https://github.com/rust-lang/rust/pull/36178
5094 [36213]: https://github.com/rust-lang/rust/pull/36213
5095 [36214]: https://github.com/rust-lang/rust/pull/36214
5096 [36264]: https://github.com/rust-lang/rust/pull/36264
5097 [36266]: https://github.com/rust-lang/rust/pull/36266
5098 [36289]: https://github.com/rust-lang/rust/pull/36289
5099 [36338]: https://github.com/rust-lang/rust/pull/36338
5100 [36351]: https://github.com/rust-lang/rust/pull/36351
5101 [36355]: https://github.com/rust-lang/rust/pull/36355
5102 [36369]: https://github.com/rust-lang/rust/pull/36369
5103 [36372]: https://github.com/rust-lang/rust/pull/36372
5104 [36423]: https://github.com/rust-lang/rust/pull/36423
5105 [36482]: https://github.com/rust-lang/rust/pull/36482
5106 [36505]: https://github.com/rust-lang/rust/pull/36505
5107 [36524]: https://github.com/rust-lang/rust/pull/36524
5108 [36527]: https://github.com/rust-lang/rust/pull/36527
5109 [36551]: https://github.com/rust-lang/rust/pull/36551
5110 [36574]: https://github.com/rust-lang/rust/pull/36574
5111 [36586]: https://github.com/rust-lang/rust/pull/36586
5112 [36592]: https://github.com/rust-lang/rust/pull/36592
5113 [36631]: https://github.com/rust-lang/rust/pull/36631
5114 [36639]: https://github.com/rust-lang/rust/pull/36639
5115 [36721]: https://github.com/rust-lang/rust/pull/36721
5116 [36727]: https://github.com/rust-lang/rust/pull/36727
5117 [36730]: https://github.com/rust-lang/rust/pull/36730
5118 [36734]: https://github.com/rust-lang/rust/pull/36734
5119 [36754]: https://github.com/rust-lang/rust/pull/36754
5120 [36995]: https://github.com/rust-lang/rust/pull/36995
5121 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5122 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5123 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5124 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5125 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5126 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5127 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5128 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5129 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5130 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5131 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5132 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5133 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5134 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5135 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5136 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5137 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5138 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5139 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5140 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5141 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5142 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5143 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5144 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5145 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5146 [rustup]: https://www.rustup.rs
5147 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5148 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5149 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5150 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5151 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5152 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5153 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5156 Version 1.12.1 (2016-10-20)
5157 ===========================
5162 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5163 * [Confusion with double negation and booleans][36856]
5164 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5165 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5166 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5167 * [Corrupted memory after updated to 1.12][36936]
5168 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5169 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5170 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5172 [36381]: https://github.com/rust-lang/rust/issues/36381
5173 [36856]: https://github.com/rust-lang/rust/issues/36856
5174 [36875]: https://github.com/rust-lang/rust/issues/36875
5175 [36924]: https://github.com/rust-lang/rust/issues/36924
5176 [36926]: https://github.com/rust-lang/rust/issues/36926
5177 [36936]: https://github.com/rust-lang/rust/issues/36936
5178 [37026]: https://github.com/rust-lang/rust/issues/37026
5179 [37112]: https://github.com/rust-lang/rust/issues/37112
5180 [37153]: https://github.com/rust-lang/rust/issues/37153
5183 Version 1.12.0 (2016-09-29)
5184 ===========================
5189 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5190 This translation pass is far simpler than the previous AST->LLVM pass, and
5191 creates opportunities to perform new optimizations directly on the MIR. It
5192 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5193 * [`rustc` presents a new, more readable error format, along with
5194 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5195 Most common editors supporting Rust have been updated to work with it. It was
5196 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5201 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5202 This translation pass is far simpler than the previous AST->LLVM pass, and
5203 creates opportunities to perform new optimizations directly on the MIR. It
5204 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5205 * [Print the Rust target name, not the LLVM target name, with
5206 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5207 * [The computation of `TypeId` is correct in some cases where it was previously
5208 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5209 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5210 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5211 `--print relocation-models`, and `--print code-models` print the available
5212 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5213 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5214 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5215 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5216 These targets produce statically-linked binaries. There are no binary release
5222 * [`rustc` presents a new, more readable error format, along with
5223 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5224 Most common editors supporting Rust have been updated to work with it. It was
5225 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5226 * [In error descriptions, references are now described in plain English,
5227 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5228 * [In error type descriptions, unknown numeric types are named `{integer}` or
5229 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5230 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5235 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5236 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5237 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5238 useful](https://github.com/rust-lang/rust/pull/34908)
5239 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5240 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5241 * [Semicolons are properly required as statement delimiters inside
5242 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5243 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5248 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5249 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5250 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5251 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5252 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5253 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5254 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5255 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5256 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5257 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5258 Both on Unix and Windows.
5259 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5260 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5261 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5262 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5263 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5264 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5265 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5266 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5271 * [The `format!` macro and friends now allow a single argument to be formatted
5272 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5273 * [The lifetime bounds on `[T]::binary_search_by` and
5274 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5275 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5276 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5277 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5278 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5279 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5280 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5281 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5282 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5283 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5284 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5285 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5286 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5287 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5288 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5289 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5290 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5291 * [`mpsc::sync_channel` `Receiver`s return any available message before
5292 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5293 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5294 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5299 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5300 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5301 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5302 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5303 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5304 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5305 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5306 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5307 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5308 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5309 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5310 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5311 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5312 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5313 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5314 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5319 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5320 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5325 * [Test binaries now support a `--test-threads` argument to specify the number
5326 of threads used to run tests, and which acts the same as the
5327 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5328 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5329 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5330 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5331 * [Rust releases now come with source packages that can be installed by rustup
5332 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5333 The resulting source code can be used by tools and IDES, located in the
5334 sysroot under `lib/rustlib/src`.
5339 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5340 * Many minor improvements to the documentation.
5341 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5346 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5347 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5348 * [When formatting strings, if "precision" is specified, the "fill",
5349 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5350 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5353 Version 1.11.0 (2016-08-18)
5354 ===========================
5359 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5360 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5361 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5362 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5367 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5368 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5369 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5370 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5371 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5372 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5373 (in libcore - previously stabilized in libstd)
5374 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5375 (in libcore - previously stabilized in libstd)
5376 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5377 (in libcore - previously stabilized in libstd)
5378 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5379 (in libcore - previously stabilized in libstd)
5380 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5381 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5382 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5383 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5388 * [The `thread_local!` macro supports multiple definitions in a single
5389 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5390 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5391 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5392 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5393 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5394 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5395 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5396 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5401 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5402 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5403 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5404 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5405 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5406 and `-vv` prints warnings for all crates.
5407 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5408 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5409 This provides room for expansion by arbitrary tools.
5410 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5411 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5412 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5413 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5414 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5415 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5416 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5421 * [Caching projections speeds up type check dramatically for some
5422 workloads](https://github.com/rust-lang/rust/pull/33816)
5423 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5424 This hasher is faster, but is believed to provide sufficient
5425 protection from collision attacks.
5426 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5431 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5432 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5433 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5434 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5435 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5440 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5441 * [When emitting debug info, rustc emits frame pointers for closures,
5442 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5443 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5444 * Many more errors have been given error codes and extended
5446 * API documentation continues to be improved, with many new examples
5451 * [rustc no longer hangs when dependencies recursively re-export
5452 submodules](https://github.com/rust-lang/rust/pull/34542)
5453 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5454 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5455 rewritten](https://github.com/rust-lang/rust/pull/33895)
5456 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5457 No targets use this yet, but it works toward AVR support.
5462 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5463 * [The new follow-set rules that place restrictions on `macro_rules!`
5464 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5465 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5466 and has been a warning since 1.10.
5467 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5468 This causes breakage in some corner cases.
5471 Version 1.10.0 (2016-07-07)
5472 ===========================
5477 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5478 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5479 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5480 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5481 * [`panic!` can be converted to a runtime abort with the
5482 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5483 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5484 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5485 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5486 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5487 Note that Cargo does not yet directly support cdylibs.
5492 * `os::windows::fs::OpenOptionsExt::access_mode`
5493 * `os::windows::fs::OpenOptionsExt::share_mode`
5494 * `os::windows::fs::OpenOptionsExt::custom_flags`
5495 * `os::windows::fs::OpenOptionsExt::attributes`
5496 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5497 * `os::unix::fs::OpenOptionsExt::custom_flags`
5498 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5499 * `Default for sync::Weak`
5500 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5501 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5502 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5503 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5504 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5505 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5506 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5507 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5508 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5509 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5510 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5511 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5512 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5513 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5514 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5515 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5516 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5517 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5518 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5519 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5520 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5521 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5522 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5523 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5524 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5525 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5526 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5527 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5528 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5529 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5530 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5531 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5532 * Read/Write/RawFd impls for `UnixStream`
5533 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5534 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5535 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5536 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5537 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5538 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5539 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5540 * RawFd impls for `UnixListener`
5541 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5542 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5543 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5544 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5545 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5546 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5547 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5548 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5549 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5550 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5551 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5552 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5553 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5554 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5555 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5556 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5557 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5558 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5559 * RawFd impls for `UnixDatagram`
5560 * `{BTree,Hash}Map::values_mut`
5561 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5566 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5567 The semantics of this minor method are subtle and probably not what
5569 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5570 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5571 will fall back to `/dev/urandom` temporarily to avoid blocking
5572 during early boot](https://github.com/rust-lang/rust/pull/33086).
5573 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5574 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5575 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5576 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5577 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5578 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5579 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5583 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5584 This controls the runtime behavior of the `panic!` macro
5585 and can be either "unwind" (the default), or "abort".
5586 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5587 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5588 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5589 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5590 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5591 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5592 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5593 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5594 By default they are retried twice, which can be customized with the
5595 `net.retry` value in `.cargo/config`.
5596 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5597 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5598 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5599 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5600 Makes it possible to install multiple crates in parallel.
5601 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5602 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5603 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5604 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5605 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5606 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5611 * [rustc memory usage was reduced by refactoring the context used for
5612 type checking](https://github.com/rust-lang/rust/pull/33425).
5613 * [Speed up creation of `HashMap`s by caching the random keys used
5614 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5615 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5616 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5617 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5618 10x faster than the previous lookup tables.
5619 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5624 * Many incremental improvements to documentation and rustdoc.
5625 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5626 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5627 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5628 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5629 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5630 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5631 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5636 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5637 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5638 * [`std` no longer prints backtraces on platforms where the running
5639 module must be loaded with `env::current_exe`, which can't be relied
5640 on](https://github.com/rust-lang/rust/pull/33554).
5641 * This release includes std binaries for the i586-unknown-linux-gnu,
5642 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5643 i586 target is for old x86 hardware without SSE2, and the armv7
5644 target is for Android running on modern ARM architectures.
5645 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5646 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5647 * [On Unix the runtime aborts by calling `libc::abort` instead of
5648 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5649 * [Rust is now bootstrapped from the previous release of Rust,
5650 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5655 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5656 * [`target_env` for Linux ARM targets is just `gnu`, not
5657 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5658 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5659 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5660 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5661 Affects how macros are parsed.
5662 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5663 * [Feature-gated attributes on macro-generated macro invocations are
5664 now rejected](https://github.com/rust-lang/rust/pull/32791).
5665 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5666 This caused some minor changes to type inference.
5669 Version 1.9.0 (2016-05-26)
5670 ==========================
5675 * The `#[deprecated]` attribute when applied to an API will generate
5676 warnings when used. The warnings may be suppressed with
5677 `#[allow(deprecated)]`. [RFC 1270].
5678 * [`fn` item types are zero sized, and each `fn` names a unique
5679 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5680 `transmute` on a `fn` type will generate a warning for a few cycles,
5681 then will be converted to an error.
5682 * [Field and method resolution understand visibility, so private
5683 fields and methods cannot prevent the proper use of public fields
5684 and methods][1.9fv].
5685 * [The parser considers unicode codepoints in the
5686 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5692 * [`std::panic::catch_unwind`] (renamed from `recover`)
5693 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5694 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5695 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5696 * [`str::is_char_boundary`]
5697 * [`<*const T>::as_ref`]
5698 * [`<*mut T>::as_ref`]
5699 * [`<*mut T>::as_mut`]
5700 * [`AsciiExt::make_ascii_uppercase`]
5701 * [`AsciiExt::make_ascii_lowercase`]
5702 * [`char::decode_utf16`]
5703 * [`char::DecodeUtf16`]
5704 * [`char::DecodeUtf16Error`]
5705 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5706 * [`BTreeSet::take`]
5707 * [`BTreeSet::replace`]
5710 * [`HashSet::replace`]
5712 * [`OsString::with_capacity`]
5713 * [`OsString::clear`]
5714 * [`OsString::capacity`]
5715 * [`OsString::reserve`]
5716 * [`OsString::reserve_exact`]
5717 * [`OsStr::is_empty`]
5719 * [`std::os::unix::thread`]
5722 * [`JoinHandleExt::as_pthread_t`]
5723 * [`JoinHandleExt::into_pthread_t`]
5724 * [`HashSet::hasher`]
5725 * [`HashMap::hasher`]
5726 * [`CommandExt::exec`]
5727 * [`File::try_clone`]
5728 * [`SocketAddr::set_ip`]
5729 * [`SocketAddr::set_port`]
5730 * [`SocketAddrV4::set_ip`]
5731 * [`SocketAddrV4::set_port`]
5732 * [`SocketAddrV6::set_ip`]
5733 * [`SocketAddrV6::set_port`]
5734 * [`SocketAddrV6::set_flowinfo`]
5735 * [`SocketAddrV6::set_scope_id`]
5736 * [`slice::copy_from_slice`]
5737 * [`ptr::read_volatile`]
5738 * [`ptr::write_volatile`]
5739 * [`OpenOptions::create_new`]
5740 * [`TcpStream::set_nodelay`]
5741 * [`TcpStream::nodelay`]
5742 * [`TcpStream::set_ttl`]
5743 * [`TcpStream::ttl`]
5744 * [`TcpStream::set_only_v6`]
5745 * [`TcpStream::only_v6`]
5746 * [`TcpStream::take_error`]
5747 * [`TcpStream::set_nonblocking`]
5748 * [`TcpListener::set_ttl`]
5749 * [`TcpListener::ttl`]
5750 * [`TcpListener::set_only_v6`]
5751 * [`TcpListener::only_v6`]
5752 * [`TcpListener::take_error`]
5753 * [`TcpListener::set_nonblocking`]
5754 * [`UdpSocket::set_broadcast`]
5755 * [`UdpSocket::broadcast`]
5756 * [`UdpSocket::set_multicast_loop_v4`]
5757 * [`UdpSocket::multicast_loop_v4`]
5758 * [`UdpSocket::set_multicast_ttl_v4`]
5759 * [`UdpSocket::multicast_ttl_v4`]
5760 * [`UdpSocket::set_multicast_loop_v6`]
5761 * [`UdpSocket::multicast_loop_v6`]
5762 * [`UdpSocket::set_multicast_ttl_v6`]
5763 * [`UdpSocket::multicast_ttl_v6`]
5764 * [`UdpSocket::set_ttl`]
5765 * [`UdpSocket::ttl`]
5766 * [`UdpSocket::set_only_v6`]
5767 * [`UdpSocket::only_v6`]
5768 * [`UdpSocket::join_multicast_v4`]
5769 * [`UdpSocket::join_multicast_v6`]
5770 * [`UdpSocket::leave_multicast_v4`]
5771 * [`UdpSocket::leave_multicast_v6`]
5772 * [`UdpSocket::take_error`]
5773 * [`UdpSocket::connect`]
5774 * [`UdpSocket::send`]
5775 * [`UdpSocket::recv`]
5776 * [`UdpSocket::set_nonblocking`]
5781 * [`std::sync::Once` is poisoned if its initialization function
5783 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5784 * [Most types implement `fmt::Debug`][1.9db].
5785 * [The default buffer size used by `BufReader` and `BufWriter` was
5786 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5787 used by other languages.
5788 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5789 `Duration` additionally implements `*=` and `/=`][1.9ta].
5790 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5791 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5792 * [`Chain` implements `BufRead`][1.9ch].
5793 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5798 * [Cargo can now run concurrently][1.9cc].
5799 * [Top-level overrides allow specific revisions of crates to be
5800 overridden through the entire crate graph][1.9ct]. This is intended
5801 to make upgrades easier for large projects, by allowing crates to be
5802 forked temporarily until they've been upgraded and republished.
5803 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5804 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5805 on the commandline][1.9cf]. `rustc` arguments can also be specified
5806 in the `build.rustflags` configuration key.
5811 * [The time complexity of comparing variables for equivalence during type
5812 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5813 to major compilation time improvement in some scenarios.
5814 * [`ToString` is specialized for `str`, giving it the same performance
5815 as `to_owned`][1.9ts].
5816 * [Spawning processes with `Command::output` no longer creates extra
5818 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5819 for C-like enums][1.9cl].
5824 * [Passing the `--quiet` flag to a test runner will produce
5825 much-abbreviated output][1.9q].
5826 * The Rust Project now publishes std binaries for the
5827 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5828 `i586-pc-windows-msvc` targets.
5833 * [`std::sync::Once` is poisoned if its initialization function
5835 * [It is illegal to define methods with the same name in overlapping
5836 inherent `impl` blocks][1.9sn].
5837 * [`fn` item types are zero sized, and each `fn` names a unique
5838 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5839 `transmute` on a `fn` type will generate a warning for a few cycles,
5840 then will be converted to an error.
5841 * [Improvements to const evaluation may trigger new errors when integer
5842 literals are out of range][1.9ce].
5845 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5846 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5847 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5848 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5849 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5850 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5851 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5852 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5853 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5854 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5855 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5856 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5857 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5858 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5859 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5860 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5861 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5862 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5863 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5864 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5865 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5866 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5867 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5868 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5869 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5870 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5871 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5872 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5873 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5874 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5875 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5876 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5877 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5878 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5879 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5880 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5881 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5882 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5883 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5884 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5885 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5886 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5887 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5888 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5889 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5890 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5891 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5892 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5893 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5894 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5895 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5896 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5897 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5898 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5899 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5900 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5901 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5902 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5903 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5904 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5905 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5906 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5907 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5908 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5909 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5910 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5911 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5912 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5913 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5914 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5915 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5916 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5917 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5918 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5919 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5920 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5921 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5922 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5923 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5924 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5925 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5926 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5927 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5928 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5929 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5930 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5931 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5932 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5933 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5934 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5935 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5936 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5937 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5938 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5939 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5940 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5941 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5942 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5943 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5944 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5945 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5946 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5947 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5948 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5949 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5950 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5951 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5952 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5953 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5954 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5957 Version 1.8.0 (2016-04-14)
5958 ==========================
5963 * Rust supports overloading of compound assignment statements like
5964 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5965 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5966 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5968 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5969 addition to the non-braced form, `struct Foo;`. [RFC 218].
5975 * [`str::encode_utf16`] (renamed from `utf16_units`)
5976 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
5979 * [`ptr::drop_in_place`]
5981 * [`time::SystemTime`]
5983 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
5984 * [`Instant::elapsed`]
5985 * [`SystemTime::now`]
5986 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
5987 * [`SystemTime::elapsed`]
5988 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5989 * [`SystemTimeError`]
5990 * [`SystemTimeError::duration`]
5991 * Various impls for `SystemTimeError`
5993 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5994 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5995 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5996 * [The `write!` and `writeln!` macros correctly emit errors if any of
5997 their arguments can't be formatted][1.8w].
5998 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5999 * [The Unix-specific `raw` modules, which contain a number of
6000 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6001 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6002 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6003 across platforms was making it difficult to implement `std`
6004 correctly. Those that need these definitions should use the `libc`
6006 * The Unix-specific `MetadataExt` traits, including
6007 `os::unix::fs::MetadataExt`, which expose values such as inode
6008 numbers [no longer return platform-specific types][1.8r], but
6009 instead return widened integers. [RFC 1415].
6010 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6011 * [Atomic loads and stores are not volatile][1.8a].
6012 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6017 * [Inlining hash functions lead to a 3% compile-time improvement in
6018 some workloads][1.8h].
6019 * When using jemalloc, its symbols are [unprefixed so that it
6020 overrides the libc malloc implementation][1.8h]. This means that for
6021 rustc, LLVM is now using jemalloc, which results in a 6%
6022 compile-time improvement on a specific workload.
6023 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6028 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6029 i686-pc-windows-msvc is now considered a tier-1 platform.
6030 * [The `--print targets` flag prints a list of supported targets][1.8t].
6031 * [The `--print cfg` flag prints the `cfg`s defined for the current
6033 * [`rustc` can be built with an new Cargo-based build system, written
6034 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6035 build system. To enable it configure with `configure --rustbuild`.
6036 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6037 variants while also indicating the total number of missing variants
6038 if more than 3][1.8m].
6039 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6040 * The Rust Project now publishes binary releases of the standard
6041 library for a number of tier-2 targets:
6042 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6043 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6044 `x86_64-rumprun-netbsd`. These can be installed with
6045 tools such as [multirust][1.8mr].
6050 * [`cargo init` creates a new Cargo project in the current
6051 directory][1.8ci]. It is otherwise like `cargo new`.
6052 * [Cargo has configuration keys for `-v` and
6053 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6054 `[term]` section of `.cargo/config`.
6055 * [Configuration keys that evaluate to strings or integers can be set
6056 via environment variables][1.8ce]. For example the `build.jobs` key
6057 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6058 precedence over config files.
6059 * [Target-specific dependencies support Rust `cfg` syntax for
6060 describing targets][1.8cfg] so that dependencies for multiple
6061 targets can be specified together. [RFC 1361].
6062 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6063 `RUSTDOC` take precedence over the `build.target-dir`,
6064 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6065 * [The child process tree is killed on Windows when Cargo is
6067 * [The `build.target` configuration value sets the target platform,
6068 like `--target`][1.8ct].
6073 * [Unstable compiler flags have been further restricted][1.8u]. Since
6074 1.0 `-Z` flags have been considered unstable, and other flags that
6075 were considered unstable additionally required passing `-Z
6076 unstable-options` to access. Unlike unstable language and library
6077 features though, these options have been accessible on the stable
6078 release channel. Going forward, *new unstable flags will not be
6079 available on the stable release channel*, and old unstable flags
6080 will warn about their usage. In the future, all unstable flags will
6081 be unavailable on the stable release channel.
6082 * [It is no longer possible to `match` on empty enum variants using
6083 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6084 * The Unix-specific `MetadataExt` traits, including
6085 `os::unix::fs::MetadataExt`, which expose values such as inode
6086 numbers [no longer return platform-specific types][1.8r], but
6087 instead return widened integers. [RFC 1415].
6088 * [Modules sourced from the filesystem cannot appear within arbitrary
6089 blocks, but only within other modules][1.8mf].
6090 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6091 * On Unix, [stack overflow triggers a runtime abort instead of a
6093 * [`Command::spawn` and its equivalents return an error if any of
6094 its command-line arguments contain interior `NUL`s][1.8n].
6095 * [Tuple and unit enum variants from other crates are in the type
6097 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6098 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6099 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6100 instead of `foo.lib`.
6103 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6104 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6105 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6106 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6107 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6108 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6109 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6110 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6111 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6112 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6113 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6114 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6115 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6116 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6117 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6118 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6119 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6120 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6121 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6122 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6123 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6124 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6125 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6126 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6127 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6128 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6129 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6130 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6131 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6132 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6133 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6134 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6135 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6136 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6137 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6138 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6139 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6140 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6141 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6142 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6143 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6144 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6145 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6146 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6147 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6148 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6149 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6150 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6151 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6152 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6153 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6154 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6155 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6156 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6157 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6158 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6159 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6160 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6161 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6162 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6165 Version 1.7.0 (2016-03-03)
6166 ==========================
6173 * [`Path::strip_prefix`] (renamed from relative_from)
6174 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6176 * [`Ipv4Addr::is_loopback`]
6177 * [`Ipv4Addr::is_private`]
6178 * [`Ipv4Addr::is_link_local`]
6179 * [`Ipv4Addr::is_multicast`]
6180 * [`Ipv4Addr::is_broadcast`]
6181 * [`Ipv4Addr::is_documentation`]
6183 * [`Ipv6Addr::is_unspecified`]
6184 * [`Ipv6Addr::is_loopback`]
6185 * [`Ipv6Addr::is_multicast`]
6188 * [`Vec::as_mut_slice`]
6190 * [`String::as_str`]
6191 * [`String::as_mut_str`]
6193 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6195 * `<[T]>::`[`sort_by_key`]
6196 * checked, saturated, and overflowing operations
6197 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6198 * [`i32::saturating_mul`]
6199 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6200 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6201 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6202 * [`u32::saturating_mul`]
6203 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6204 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6205 * and checked, saturated, and overflowing operations for other primitive types
6207 * [`ffi::IntoStringError`]
6208 * [`CString::into_string`]
6209 * [`CString::into_bytes`]
6210 * [`CString::into_bytes_with_nul`]
6211 * `From<CString> for Vec<u8>`
6213 * [`IntoStringError::into_cstring`]
6214 * [`IntoStringError::utf8_error`]
6215 * `Error for IntoStringError`
6217 * [`std::hash::BuildHasher`]
6218 * [`BuildHasher::Hasher`]
6219 * [`BuildHasher::build_hasher`]
6220 * [`std::hash::BuildHasherDefault`]
6221 * [`HashMap::with_hasher`]
6222 * [`HashMap::with_capacity_and_hasher`]
6223 * [`HashSet::with_hasher`]
6224 * [`HashSet::with_capacity_and_hasher`]
6225 * [`std::collections::hash_map::RandomState`]
6226 * [`RandomState::new`]
6227 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6228 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6229 from bytes is faster.
6230 * [The performance of `LineWriter` (and thus `io::stdout`) was
6231 improved by using `memchr` to search for newlines][1.7m].
6232 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6233 `f64` variants were stabilized previously.
6234 * [`BTreeMap` was rewritten to use less memory and improve the performance
6235 of insertion and iteration, the latter by as much as 5x][1.7bm].
6236 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6237 covariant over their contained type][1.7bt].
6238 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6239 over their contained type][1.7ll].
6240 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6242 * [`Any` is implemented for unsized types][1.7a].
6243 * [`Hash` is implemented for `Duration`][1.7h].
6248 * [When running tests with `--test`, rustdoc will pass `--cfg`
6249 arguments to the compiler][1.7dt].
6250 * [The compiler is built with RPATH information by default][1.7rpa].
6251 This means that it will be possible to run `rustc` when installed in
6252 unusual configurations without configuring the dynamic linker search
6254 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6255 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6256 over `LD_LIBRARY_PATH`.
6261 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6262 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6263 * [The `rerun-if-changed` build script directive no longer causes the
6264 build script to incorrectly run twice in certain scenarios][1.7rr].
6269 * Soundness fixes to the interactions between associated types and
6270 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6271 code that violates the new rules. This is a significant change that
6272 is known to break existing code, so it has emitted warnings for the
6273 new error cases since 1.4 to give crate authors time to adapt. The
6274 details of what is changing are subtle; read the RFC for more.
6275 * [Several bugs in the compiler's visibility calculations were
6276 fixed][1.7v]. Since this was found to break significant amounts of
6277 code, the new errors will be emitted as warnings for several release
6278 cycles, under the `private_in_public` lint.
6279 * Defaulted type parameters were accidentally accepted in positions
6280 that were not intended. In this release, [defaulted type parameters
6281 appearing outside of type definitions will generate a
6282 warning][1.7d], which will become an error in future releases.
6283 * [Parsing "." as a float results in an error instead of 0][1.7p].
6284 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6285 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6287 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6288 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6289 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6290 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6291 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6292 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6293 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6294 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6295 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6296 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6297 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6298 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6299 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6300 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6301 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6302 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6303 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6304 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6305 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6306 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6307 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6308 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6309 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6310 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6311 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6312 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6313 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6314 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6315 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6316 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6317 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6318 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6319 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6320 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6321 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6322 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6323 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6324 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6325 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6326 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6327 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6328 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6329 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6330 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6331 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6332 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6333 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6334 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6335 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6336 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6337 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6338 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6339 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6340 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6341 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6342 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6343 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6344 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6345 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6346 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6347 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6348 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6349 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6350 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6351 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6352 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6353 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6354 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6355 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6356 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6357 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6358 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6359 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6360 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6361 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6362 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6363 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6364 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6365 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6368 Version 1.6.0 (2016-01-21)
6369 ==========================
6374 * The `#![no_std]` attribute causes a crate to not be linked to the
6375 standard library, but only the [core library][1.6co], as described
6376 in [RFC 1184]. The core library defines common types and traits but
6377 has no platform dependencies whatsoever, and is the basis for Rust
6378 software in environments that cannot support a full port of the
6379 standard library, such as operating systems. Most of the core
6380 library is now stable.
6386 [`Read::read_exact`],
6387 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6388 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6389 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6390 [`os::unix::fs::DirBuilderExt`],
6391 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6392 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6393 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6394 [`collections::hash_map::Drain`],
6395 [`collections::hash_map::HashMap::drain`],
6396 [`collections::hash_set::Drain`],
6397 [`collections::hash_set::HashSet::drain`],
6398 [`collections::binary_heap::Drain`],
6399 [`collections::binary_heap::BinaryHeap::drain`],
6400 [`Vec::extend_from_slice`] (renamed from `push_all`),
6401 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6402 [`RwLock::into_inner`],
6403 [`Iterator::min_by_key`] (renamed from `min_by`),
6404 [`Iterator::max_by_key`] (renamed from `max_by`).
6405 * The [core library][1.6co] is stable, as are most of its APIs.
6406 * [The `assert_eq!` macro supports arguments that don't implement
6407 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6409 * Several timer functions that take duration in milliseconds [are
6410 deprecated in favor of those that take `Duration`][1.6ms]. These
6411 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6412 `thread::park_timeout_ms`.
6413 * The algorithm by which `Vec` reserves additional elements was
6414 [tweaked to not allocate excessive space][1.6a] while still growing
6416 * `From` conversions are [implemented from integers to floats][1.6f]
6417 in cases where the conversion is lossless. Thus they are not
6418 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6419 or `f64`. They are also not implemented for `isize` and `usize`
6420 because the implementations would be platform-specific. `From` is
6421 also implemented from `f32` to `f64`.
6422 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6423 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6424 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6425 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6427 * Sorting slices that are already sorted [is 50% faster in some
6433 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6434 * Cargo build scripts can specify their dependencies by emitting the
6435 [`rerun-if-changed`][1.6rr] key.
6436 * crates.io will reject publication of crates with dependencies that
6437 have a wildcard version constraint. Crates with wildcard
6438 dependencies were seen to cause a variety of problems, as described
6439 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6441 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6442 release folder. A variety of artifacts that Cargo failed to clean
6443 are now correctly deleted.
6448 * The `unreachable_code` lint [warns when a function call's argument
6450 * The parser indicates [failures that may be caused by
6451 confusingly-similar Unicode characters][1.6uc]
6452 * Certain macro errors [are reported at definition time][1.6m], not
6458 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6459 environment variable when locating crates. This was a pre-cargo
6460 feature for integrating with the package manager that was
6461 accidentally never removed.
6462 * [A number of bugs were fixed in the privacy checker][1.6p] that
6463 could cause previously-accepted code to break.
6464 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6465 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6466 struct pattern syntax (`Foo(..)`) can no longer be used to match
6467 unit structs. This is a warning now, but will become an error in
6468 future releases. Patterns that share the same name as a const are
6470 * A bug was fixed that causes [rustc not to apply default type
6471 parameters][1.6xc] when resolving certain method implementations of
6472 traits defined in other crates.
6474 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6475 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6476 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6477 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6478 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6479 [1.6co]: http://doc.rust-lang.org/core/index.html
6480 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6481 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6482 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6483 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6484 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6485 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6486 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6487 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6488 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6489 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6490 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6491 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6492 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6493 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6494 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6495 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6496 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6497 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6498 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6499 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6500 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6501 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6502 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6503 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6504 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6505 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6506 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6507 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6508 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6509 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6510 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6511 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6512 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6513 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6514 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6515 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6516 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6517 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6518 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6519 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6520 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6523 Version 1.5.0 (2015-12-10)
6524 ==========================
6526 * ~700 changes, numerous bugfixes
6532 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6533 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6534 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6535 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6536 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6537 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6538 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6539 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6540 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6541 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6542 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6543 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6544 [`Path::read_link`], [`Path::symlink_metadata`],
6545 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6546 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6547 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6548 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6549 [`slice::split_first_mut`], [`slice::split_first`],
6550 [`slice::split_last_mut`], [`slice::split_last`],
6551 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6552 [`str::MatchIndices`], [`str::RMatchIndices`],
6553 [`str::match_indices`], [`str::rmatch_indices`],
6554 [`str::slice_mut_unchecked`], [`string::ParseError`].
6555 * Rust applications hosted on crates.io can be installed locally to
6556 `~/.cargo/bin` with the [`cargo install`] command. Among other
6557 things this makes it easier to augment Cargo with new subcommands:
6558 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6559 invoked as `cargo foo`.
6560 * Crates with wildcard (`*`) dependencies will [emit warnings when
6561 published][1.5w]. In 1.6 it will no longer be possible to publish
6562 crates with wildcard dependencies.
6567 * The rules determining when a particular lifetime must outlive
6568 a particular value (known as '[dropck]') have been [modified
6569 to not rely on parametricity][1.5p].
6570 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6571 and `Arc`][1.5a]. Because these smart pointer types implement
6572 `Deref`, this causes breakage in cases where the interior type
6573 contains methods of the same name.
6574 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6575 that they could drop their content. Soundness fix.
6576 * All method invocations are [properly checked][1.5wf1] for
6577 [well-formedness][1.5wf2]. Soundness fix.
6578 * Traits whose supertraits contain `Self` are [not object
6579 safe][1.5o]. Soundness fix.
6580 * Target specifications support a [`no_default_libraries`][1.5nd]
6581 setting that controls whether `-nodefaultlibs` is passed to the
6582 linker, and in turn the `is_like_windows` setting no longer affects
6583 the `-nodefaultlibs` flag.
6584 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6585 * The `#[inline]` and `#[repr]` attributes [can only appear
6586 in valid locations][1.5at].
6587 * Native libraries linked from the local crate are [passed to
6588 the linker before native libraries from upstream crates][1.5nl].
6589 * Two rarely-used attributes, `#[no_debug]` and
6590 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6591 * Negation of unsigned integers, which has been a warning for
6592 several releases, [is now behind a feature gate and will
6593 generate errors][1.5nu].
6594 * The parser accidentally accepted visibility modifiers on
6595 enum variants, a bug [which has been fixed][1.5ev].
6596 * [A bug was fixed that allowed `use` statements to import unstable
6602 * When evaluating expressions at compile-time that are not
6603 compile-time constants (const-evaluating expressions in non-const
6604 contexts), incorrect code such as overlong bitshifts and arithmetic
6605 overflow will [generate a warning instead of an error][1.5ce],
6606 delaying the error until runtime. This will allow the
6607 const-evaluator to be expanded in the future backwards-compatibly.
6608 * The `improper_ctypes` lint [no longer warns about using `isize` and
6609 `usize` in FFI][1.5ict].
6614 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6616 * `Default` is [implemented for mutable slices][1.5d].
6617 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6618 * There are now `From` conversions [between floating point
6619 types][1.5f] where the conversions are lossless.
6620 * There are now `From` conversions [between integer types][1.5i] where
6621 the conversions are lossless.
6622 * [`fs::Metadata` implements `Clone`][1.5fs].
6623 * The `parse` method [accepts a leading "+" when parsing
6625 * [`AsMut` is implemented for `Vec`][1.5am].
6626 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6627 been optimized][1.5cf] and no longer rely on the default impl.
6628 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6629 `unsafe extern "C"` function types now [implement `Clone`,
6630 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6631 `fmt::Debug` for up to 12 arguments][1.5fp].
6632 * [Dropping `Vec`s is much faster in unoptimized builds when the
6633 element types don't implement `Drop`][1.5dv].
6634 * A bug that caused in incorrect behavior when [combining `VecDeque`
6635 with zero-sized types][1.5vdz] was resolved.
6636 * [`PartialOrd` for slices is faster][1.5po].
6641 * [Crate metadata size was reduced by 20%][1.5md].
6642 * [Improvements to code generation reduced the size of libcore by 3.3
6643 MB and rustc's memory usage by 18MB][1.5m].
6644 * [Improvements to deref translation increased performance in
6645 unoptimized builds][1.5dr].
6646 * Various errors in trait resolution [are deduplicated to only be
6647 reported once][1.5te].
6648 * Rust has preliminary [support for rumprun kernels][1.5rr].
6649 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6651 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6652 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6653 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6654 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6655 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6656 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6657 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6658 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6659 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6660 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6661 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6662 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6663 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6664 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6665 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6666 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6667 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6668 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6669 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6670 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6671 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6672 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6673 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6674 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6675 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6676 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6677 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6678 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6679 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6680 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6681 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6682 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6683 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6684 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6685 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6686 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6687 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6688 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6689 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6690 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6691 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6692 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6693 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6694 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6695 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6696 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6697 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6698 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6699 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6700 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6701 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6702 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6703 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6704 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6705 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6706 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6707 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6708 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6709 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6710 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6711 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6712 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6713 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6714 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6715 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6716 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6717 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6718 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6719 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6720 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6721 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6722 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6723 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6724 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6725 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6726 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6727 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6728 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6729 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6730 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6731 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6732 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6733 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6734 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6735 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6736 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6737 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6738 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6739 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6741 Version 1.4.0 (2015-10-29)
6742 ==========================
6744 * ~1200 changes, numerous bugfixes
6749 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6750 GNU) are now supported and recommended for use.
6755 * [Several changes have been made to fix type soundness and improve
6756 the behavior of associated types][sound]. See [RFC 1214]. Although
6757 we have mostly introduced these changes as warnings this release, to
6758 become errors next release, there are still some scenarios that will
6759 see immediate breakage.
6760 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6761 line breaks in addition to `\n`][crlf].
6762 * [Loans of `'static` lifetime extend to the end of a function][stat].
6763 * [`str::parse` no longer introduces avoidable rounding error when
6764 parsing floating point numbers. Together with earlier changes to
6765 float formatting/output, "round trips" like f.to_string().parse()
6766 now preserve the value of f exactly. Additionally, leading plus
6767 signs are now accepted][fp3].
6773 * `use` statements that import multiple items [can now rename
6774 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6775 * [Binops work correctly on fat pointers][binfat].
6776 * `pub extern crate`, which does not behave as expected, [issues a
6777 warning][pec] until a better solution is found.
6782 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6783 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6784 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6785 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6786 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6787 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6788 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6789 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6790 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6791 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6792 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6793 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6794 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6795 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6796 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6797 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6798 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6799 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6801 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6802 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6803 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6804 `f64::from_str_radix`.
6805 * [Reverse-searching strings is faster with the 'two-way'
6807 * [`std::io::copy` allows `?Sized` arguments][cc].
6808 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6809 [override `count`, `nth` and `last` with an O(1)
6810 implementation][it].
6811 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6812 * [`IntoRawFd` has been added to the Unix-specific prelude,
6813 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6815 * [`Extend<String>` and `FromIterator<String` are both implemented for
6817 * [`IntoIterator` is implemented for references to `Option` and
6819 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6820 Copy`][ext] as part of [RFC 839]. This will cause type inference
6821 breakage in rare situations.
6822 * [`BinaryHeap` implements `Debug`][bh2].
6823 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6825 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6826 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6827 * [String comparison is faster][faststr].
6828 * `&mut T` where `T: std::fmt::Write` [also implements
6829 `std::fmt::Write`][mutw].
6830 * [A stable regression in `VecDeque::push_back` and other
6831 capacity-altering methods that caused panics for zero-sized types
6833 * [Function pointers implement traits for up to 12 parameters][fp2].
6838 * The compiler [no longer uses the 'morestack' feature to prevent
6839 stack overflow][mm]. Instead it uses guard pages and stack
6840 probes (though stack probes are not yet implemented on any platform
6842 * [The compiler matches traits faster when projections are involved][p].
6843 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6845 * [Cargo now displays useful information about what its doing during
6846 `cargo update`][cu].
6848 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6849 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6850 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6851 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6852 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6853 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6854 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6855 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6856 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6857 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6858 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6859 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6860 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6861 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6862 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6863 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6864 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6865 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6866 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6867 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6868 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6869 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6870 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6871 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6872 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6873 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6874 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6875 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6876 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6877 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6878 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6879 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6880 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6881 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6882 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6883 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6884 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6885 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6886 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6887 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6888 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6889 [bh2]: https://github.com/rust-lang/rust/pull/28156
6890 [binfat]: https://github.com/rust-lang/rust/pull/28270
6891 [bm]: https://github.com/rust-lang/rust/pull/28197
6892 [cc]: https://github.com/rust-lang/rust/pull/27531
6893 [crlf]: https://github.com/rust-lang/rust/pull/28034
6894 [cu]: https://github.com/rust-lang/cargo/pull/1931
6895 [d]: https://github.com/rust-lang/rust/pull/27825
6896 [dep]: https://github.com/rust-lang/rust/pull/28339
6897 [es]: https://github.com/rust-lang/rust/pull/27956
6898 [ext]: https://github.com/rust-lang/rust/pull/28094
6899 [faststr]: https://github.com/rust-lang/rust/pull/28338
6900 [ffi]: https://github.com/rust-lang/rust/pull/28779
6901 [fp]: https://github.com/rust-lang/rust/pull/28268
6902 [fp2]: https://github.com/rust-lang/rust/pull/28560
6903 [fp3]: https://github.com/rust-lang/rust/pull/27307
6904 [i]: https://github.com/rust-lang/rust/pull/27451
6905 [into2]: https://github.com/rust-lang/rust/pull/28039
6906 [it]: https://github.com/rust-lang/rust/pull/27652
6907 [mm]: https://github.com/rust-lang/rust/pull/27338
6908 [mutw]: https://github.com/rust-lang/rust/pull/28368
6909 [sound]: https://github.com/rust-lang/rust/pull/27641
6910 [p]: https://github.com/rust-lang/rust/pull/27866
6911 [pec]: https://github.com/rust-lang/rust/pull/28486
6912 [pr]: https://github.com/rust-lang/rust/pull/27896
6913 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6914 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6915 [s]: https://github.com/rust-lang/rust/pull/27474
6916 [stab]: https://github.com/rust-lang/rust/pull/28339
6917 [stat]: https://github.com/rust-lang/rust/pull/28321
6918 [vd]: https://github.com/rust-lang/rust/pull/28494
6920 Version 1.3.0 (2015-09-17)
6921 ==============================
6923 * ~900 changes, numerous bugfixes
6928 * The [new object lifetime defaults][nold] have been [turned
6929 on][nold2] after a cycle of warnings about the change. Now types
6930 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6931 being interpreted as `&'a Box<Trait+'a>` to `&'a
6932 Box<Trait+'static>`.
6933 * [The Rustonomicon][nom] is a new book in the official documentation
6934 that dives into writing unsafe Rust.
6935 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6936 timekeeping is employed by other std APIs, as well as out-of-tree
6942 * The [new object lifetime defaults][nold] have been [turned
6943 on][nold2] after a cycle of warnings about the change.
6944 * There is a known [regression][lr] in how object lifetime elision is
6945 interpreted, the proper solution for which is undetermined.
6946 * The `#[prelude_import]` attribute, an internal implementation
6947 detail, was accidentally stabilized previously. [It has been put
6948 behind the `prelude_import` feature gate][pi]. This change is
6949 believed to break no existing code.
6950 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6951 [more sane for dynamically sized types][dst3]. Code that relied on
6952 the previous behavior is thought to be broken.
6953 * The `dropck` rules, which checks that destructors can't access
6954 destroyed values, [have been updated][dropck] to match the
6955 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6956 cause some previously-compiling code to no longer build.
6961 * The [new object lifetime defaults][nold] have been [turned
6962 on][nold2] after a cycle of warnings about the change.
6963 * Semicolons may [now follow types and paths in
6964 macros](https://github.com/rust-lang/rust/pull/27000).
6965 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6966 [more sane for dynamically sized types][dst3]. Code that relied on
6967 the previous behavior is not known to exist, and suspected to be
6969 * `'static` variables [may now be recursive][st].
6970 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6971 implementations correctly.
6972 * The `dropck` rules, which checks that destructors can't access
6973 destroyed values, [have been updated][dropck] to match the
6979 * The [`Duration`] API, [has been stabilized][ds], as well as the
6980 `std::time` module, which presently contains only `Duration`.
6981 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6982 * The owned C string, [`CString`], implements [`Borrow`] and the
6983 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6984 these allow C strings to be borrowed and cloned in generic code.
6985 * [`CStr`] implements [`Debug`].
6986 * [`AtomicPtr`] implements [`Debug`].
6987 * [`Error`] trait objects [can be downcast to their concrete types][e]
6988 in many common configurations, using the [`is`], [`downcast`],
6989 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6991 * Searching for substrings now [employs the two-way algorithm][search]
6992 instead of doing a naive search. This gives major speedups to a
6993 number of methods, including [`contains`][sc], [`find`][sf],
6994 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6995 [`ends_with`][sew] are also faster.
6996 * The performance of `PartialEq` for slices is [much faster][ps].
6997 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6998 is overridden and optimized by the implementations for scalars.
6999 * The [`Hasher`] trait now has a number of specialized `write_*`
7000 methods for primitive types, for efficiency.
7001 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7002 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7003 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7004 of [`std::error::Error::cause`][iec] also delegates to the inner
7006 * [`process::Child`][pc] gained the [`id`] method, which returns a
7007 `u32` representing the platform-specific process identifier.
7008 * The [`connect`] method on slices is deprecated, replaced by the new
7009 [`join`] method (note that both of these are on the *unstable*
7010 [`SliceConcatExt`] trait, but through the magic of the prelude are
7011 available to stable code anyway).
7012 * The [`Div`] operator is implemented for [`Wrapping`] types.
7013 * [`DerefMut` is implemented for `String`][dms].
7014 * Performance of SipHash (the default hasher for `HashMap`) is
7015 [better for long data][sh].
7016 * [`AtomicPtr`] implements [`Send`].
7017 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7018 are now [specialized to use uninitialized buffers for increased
7020 * Lifetime parameters of foreign functions [are now resolved
7026 * Rust can now, with some coercion, [produce programs that run on
7027 Windows XP][xp], though XP is not considered a supported platform.
7028 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7029 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7030 recommended for use in 1.3, though should be fully-functional
7031 in the [64-bit 1.4 beta][b14].
7032 * On Fedora-based systems installation will [properly configure the
7033 dynamic linker][fl].
7034 * The compiler gained many new extended error descriptions, which can
7035 be accessed with the `--explain` flag.
7036 * The `dropck` pass, which checks that destructors can't access
7037 destroyed values, [has been rewritten][dropck]. This fixes some
7038 soundness holes, and as such will cause some previously-compiling
7039 code to no longer build.
7040 * `rustc` now uses [LLVM to write archive files where possible][ar].
7041 Eventually this will eliminate the compiler's dependency on the ar
7043 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7044 supported FreeBSD on x86_64).
7045 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7046 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7048 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7049 will kill the process instead of leaking][nlp].
7051 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7052 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7053 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7054 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7055 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7056 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7057 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7058 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7059 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7060 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7061 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7062 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7063 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7064 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7065 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7066 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7067 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7068 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7069 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7070 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7071 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7072 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7073 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7074 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7075 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7076 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7077 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7078 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7079 [ar]: https://github.com/rust-lang/rust/pull/26926
7080 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7081 [dms]: https://github.com/rust-lang/rust/pull/26241
7082 [dropck]: https://github.com/rust-lang/rust/pull/27261
7083 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7084 [ds]: https://github.com/rust-lang/rust/pull/26818
7085 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7086 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7087 [dst3]: https://github.com/rust-lang/rust/pull/27351
7088 [e]: https://github.com/rust-lang/rust/pull/24793
7089 [f]: https://github.com/rust-lang/rust/pull/26588
7090 [fb]: https://github.com/rust-lang/rust/pull/26959
7091 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7092 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7093 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7094 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7095 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7096 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7097 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7098 [lic]: https://github.com/rust-lang/rust/pull/26583
7099 [lnu]: https://github.com/rust-lang/rust/pull/27026
7100 [lr]: https://github.com/rust-lang/rust/issues/27248
7101 [lum]: https://github.com/rust-lang/rust/pull/26378
7102 [lur]: https://github.com/rust-lang/rust/pull/26783
7103 [nlp]: https://github.com/rust-lang/rust/pull/27176
7104 [nold2]: https://github.com/rust-lang/rust/pull/27045
7105 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7106 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7107 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7108 [pi]: https://github.com/rust-lang/rust/pull/26699
7109 [ps]: https://github.com/rust-lang/rust/pull/26884
7110 [rte]: https://github.com/rust-lang/rust/pull/26950
7111 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7112 [search]: https://github.com/rust-lang/rust/pull/26327
7113 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7114 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7115 [sh]: https://github.com/rust-lang/rust/pull/27280
7116 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7117 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7118 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7119 [st]: https://github.com/rust-lang/rust/pull/26630
7120 [win1]: https://github.com/rust-lang/rust/pull/26569
7121 [win2]: https://github.com/rust-lang/rust/pull/26741
7122 [win3]: https://github.com/rust-lang/rust/pull/26741
7123 [win4]: https://github.com/rust-lang/rust/pull/27210
7124 [xp]: https://github.com/rust-lang/rust/pull/26569
7126 Version 1.2.0 (2015-08-07)
7127 ==========================
7129 * ~1200 changes, numerous bugfixes
7134 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7135 like `Rc` to contain types without a fixed size, arrays and trait
7136 objects, finally enabling use of `Rc<[T]>` and completing the
7137 implementation of DST.
7138 * [Parallel codegen][parcodegen] is now working again, which can
7139 substantially speed up large builds in debug mode; It also gets
7140 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7141 jobs). It's not enabled by default, but will be "in the near
7142 future". It can be activated with the `-C codegen-units=N` flag to
7144 * This is the first release with [experimental support for linking
7145 with the MSVC linker and lib C on Windows (instead of using the GNU
7146 variants via MinGW)][win]. It is yet recommended only for the most
7147 intrepid Rustaceans.
7148 * Benchmark compilations are showing a 30% improvement in
7149 bootstrapping over 1.1.
7154 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7155 unicode case mapping, which is a previously-planned change in
7156 behavior and considered a bugfix.
7157 * [`mem::align_of`] now specifies [the *minimum alignment* for
7158 T][align], which is usually the alignment programs are interested
7159 in, and the same value reported by clang's
7160 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7162 * [The `#[packed]` attribute is no longer silently accepted by the
7163 compiler][packed]. This attribute did nothing and code that
7164 mentioned it likely did not work as intended.
7165 * Associated type defaults are [now behind the
7166 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7167 defaults *did not work*, but could be mentioned syntactically. As
7168 such this breakage has minimal impact.
7173 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7174 matching against dereferenceable values.
7179 * The [`Extend`] trait, which grows a collection from an iterator, is
7180 implemented over iterators of references, for `String`, `Vec`,
7181 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7182 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7183 * The [`iter::once`] function returns an iterator that yields a single
7184 element, and [`iter::empty`] returns an iterator that yields no
7186 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7187 over substring matches.
7188 * [`Cell`] and [`RefCell`] both implement `Eq`.
7189 * A number of methods for wrapping arithmetic are added to the
7190 integral types, [`wrapping_div`], [`wrapping_rem`],
7191 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7192 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7193 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7194 type.. It is illegal for the default arithmetic operations in Rust
7195 to overflow; the desire to wrap must be explicit.
7196 * The `{:#?}` formatting specifier [displays the alternate,
7197 pretty-printed][debugfmt] form of the `Debug` formatter. This
7198 feature was actually introduced prior to 1.0 with little
7200 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7201 for writing data to formatted strings, similar to [`io::Write`].
7202 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7203 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7204 are used by code generators to emit implementations of [`Debug`].
7205 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7206 methods that convert case, following Unicode case mapping.
7207 * It is now easier to handle poisoned locks. The [`PoisonError`]
7208 type, returned by failing lock operations, exposes `into_inner`,
7209 `get_ref`, and `get_mut`, which all give access to the inner lock
7210 guard, and allow the poisoned lock to continue to operate. The
7211 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7212 poisoned lock without attempting to take the lock.
7213 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7214 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7215 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7216 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7218 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7224 * `rustc` employs smarter heuristics for guessing at [typos].
7225 * `rustc` emits more efficient code for [no-op conversions between
7226 unsafe pointers][nop].
7227 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7228 resulting in faster compile times and smaller code.
7230 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7231 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7232 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7233 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7234 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7235 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7236 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7237 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7238 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7239 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7240 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7241 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7242 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7243 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7244 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7245 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7246 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7247 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7248 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7249 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7250 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7251 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7252 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7253 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7254 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7255 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7256 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7257 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7258 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7259 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7260 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7261 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7262 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7263 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7264 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7265 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7266 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7267 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7268 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7269 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7270 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7271 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7272 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7273 [align]: https://github.com/rust-lang/rust/pull/25646
7274 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7275 [typos]: https://github.com/rust-lang/rust/pull/26087
7276 [nop]: https://github.com/rust-lang/rust/pull/26336
7277 [fat]: https://github.com/rust-lang/rust/pull/26411
7278 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7279 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7280 [packed]: https://github.com/rust-lang/rust/pull/25541
7281 [ad]: https://github.com/rust-lang/rust/pull/27382
7282 [win]: https://github.com/rust-lang/rust/pull/25350
7284 Version 1.1.0 (2015-06-25)
7285 =========================
7287 * ~850 changes, numerous bugfixes
7292 * The [`std::fs` module has been expanded][fs] to expand the set of
7293 functionality exposed:
7294 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7295 don't incur a syscall on some platforms.
7296 * A `symlink_metadata` function has been added.
7297 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7298 access to all underlying information.
7299 * The compiler now contains extended explanations of many errors. When an error
7300 with an explanation occurs the compiler suggests using the `--explain` flag
7301 to read the explanation. Error explanations are also [available online][err-index].
7302 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7303 well as other work, the time to bootstrap the compiler decreased by
7309 * The [`str::split_whitespace`] method splits a string on unicode
7310 whitespace boundaries.
7311 * On both Windows and Unix, new extension traits provide conversion of
7312 I/O types to and from the underlying system handles. On Unix, these
7313 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7314 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7315 `TcpListener`, and `UpdSocket`. Further implementations for
7316 `std::process` will be stabilized later.
7317 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7318 Windows, symlinks can be created with
7319 `std::os::windows::symlink_dir` and
7320 `std::os::windows::symlink_file`.
7321 * The `mpsc::Receiver` type can now be converted into an iterator with
7322 `into_iter` on the [`IntoIterator`] trait.
7323 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7324 implementation of the [`From`] trait.
7325 * The `Debug` implementation for `RangeFull` [creates output that is
7326 more consistent with other implementations][rf].
7327 * [`Debug` is implemented for `File`][file].
7328 * The `Default` implementation for `Arc` [no longer requires `Sync +
7330 * [The `Iterator` methods `count`, `nth`, and `last` have been
7331 overridden for slices to have O(1) performance instead of O(n)][si].
7332 * Incorrect handling of paths on Windows has been improved in both the
7333 compiler and the standard library.
7334 * [`AtomicPtr` gained a `Default` implementation][ap].
7335 * In accordance with Rust's policy on arithmetic overflow `abs` now
7336 [panics on overflow when debug assertions are enabled][abs].
7337 * The [`Cloned`] iterator, which was accidentally left unstable for
7338 1.0 [has been stabilized][c].
7339 * The [`Incoming`] iterator, which iterates over incoming TCP
7340 connections, and which was accidentally unnamable in 1.0, [is now
7341 properly exported][inc].
7342 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7343 `sift_up` or `sift_down` panic][bh].
7344 * The [`split_off`] method of `LinkedList` [no longer corrupts
7345 the list in certain scenarios][ll].
7350 * Type checking performance [has improved notably][sk] with
7351 [multiple improvements][pre].
7352 * The compiler [suggests code changes][ch] for more errors.
7353 * rustc and it's build system have experimental support for [building
7354 toolchains against MUSL][m] instead of glibc on Linux.
7355 * The compiler defines the `target_env` cfg value, which is used for
7356 distinguishing toolchains that are otherwise for the same
7357 platform. Presently this is set to `gnu` for common GNU Linux
7358 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7359 * The [`cargo rustc`][crc] command invokes a build with custom flags
7361 * [Android executables are always position independent][pie].
7362 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7365 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7366 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7367 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7368 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7369 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7370 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7371 [rf]: https://github.com/rust-lang/rust/pull/24491
7372 [err-index]: https://doc.rust-lang.org/error-index.html
7373 [sk]: https://github.com/rust-lang/rust/pull/24615
7374 [pre]: https://github.com/rust-lang/rust/pull/25323
7375 [file]: https://github.com/rust-lang/rust/pull/24598
7376 [ch]: https://github.com/rust-lang/rust/pull/24683
7377 [arc]: https://github.com/rust-lang/rust/pull/24695
7378 [si]: https://github.com/rust-lang/rust/pull/24701
7379 [ap]: https://github.com/rust-lang/rust/pull/24834
7380 [m]: https://github.com/rust-lang/rust/pull/24777
7381 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7382 [crc]: https://github.com/rust-lang/cargo/pull/1568
7383 [pie]: https://github.com/rust-lang/rust/pull/24953
7384 [abs]: https://github.com/rust-lang/rust/pull/25441
7385 [c]: https://github.com/rust-lang/rust/pull/25496
7386 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7387 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7388 [inc]: https://github.com/rust-lang/rust/pull/25522
7389 [bh]: https://github.com/rust-lang/rust/pull/25856
7390 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7391 [ll]: https://github.com/rust-lang/rust/pull/26022
7392 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7393 [drop]: https://github.com/rust-lang/rust/pull/24935
7395 Version 1.0.0 (2015-05-15)
7396 ========================
7398 * ~1500 changes, numerous bugfixes
7403 * The vast majority of the standard library is now `#[stable]`. It is
7404 no longer possible to use unstable features with a stable build of
7406 * Many popular crates on [crates.io] now work on the stable release
7408 * Arithmetic on basic integer types now [checks for overflow in debug
7414 * Several [restrictions have been added to trait coherence][coh] in
7415 order to make it easier for upstream authors to change traits
7416 without breaking downstream code.
7417 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7418 improve error messages and macro behavior. For example, `0b1234` is
7419 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7420 * Trait bounds [are always invariant][inv], eliminating the need for
7421 the `PhantomFn` and `MarkerTrait` lang items, which have been
7423 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7424 "foo" as bar` syntax has been replaced with `extern crate foo as
7425 bar`, and Cargo now automatically translates "-" in *package* names
7426 to underscore for the crate name.
7427 * [Lifetime shadowing is an error][lt].
7428 * [`Send` no longer implies `'static`][send-rfc].
7429 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7430 `MyType::default()`.
7431 * Primitive types [now have inherent methods][prim-inherent],
7432 obviating the need for extension traits like `SliceExt`.
7433 * Methods with `Self: Sized` in their `where` clause are [considered
7434 object-safe][self-sized], allowing many extension traits like
7435 `IteratorExt` to be merged into the traits they extended.
7436 * You can now [refer to associated types][assoc-where] whose
7437 corresponding trait bounds appear only in a `where` clause.
7438 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7439 like `Send` and `Sync` are now library-defined.
7440 * A [Reflect trait][reflect] was introduced, which means that
7441 downcasting via the `Any` trait is effectively limited to concrete
7442 types. This helps retain the potentially-important "parametricity"
7443 property: generic code cannot behave differently for different type
7444 arguments except in minor ways.
7445 * The `unsafe_destructor` feature is now deprecated in favor of the
7446 [new `dropck`][dropck]. This change is a major reduction in unsafe
7452 * The `thread_local` module [has been renamed to `std::thread`][th].
7453 * The methods of `IteratorExt` [have been moved to the `Iterator`
7455 * Several traits that implement Rust's conventions for type
7456 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7457 [centralized in the `std::convert` module][con].
7458 * The `FromError` trait [was removed in favor of `From`][fe].
7459 * The basic sleep function [has moved to
7460 `std::thread::sleep_ms`][slp].
7461 * The `splitn` function now takes an `n` parameter that represents the
7462 number of items yielded by the returned iterator [instead of the
7463 number of 'splits'][spl].
7464 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7465 * [Derived implementations of `PartialOrd` now order enums according
7466 to their explicitly-assigned discriminants][po].
7467 * [Methods for searching strings are generic over `Pattern`s][pat],
7468 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7470 * [In method resolution, object methods are resolved before inherent
7472 * [`String::from_str` has been deprecated in favor of the `From` impl,
7473 `String::from`][sf].
7474 * [`io::Error` implements `Sync`][ios].
7475 * [The `words` method on `&str` has been replaced with
7476 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7478 * The new path and IO modules are complete and `#[stable]`. This
7479 was the major library focus for this cycle.
7480 * The path API was [revised][path-normalize] to normalize `.`,
7481 adjusting the tradeoffs in favor of the most common usage.
7482 * A large number of remaining APIs in `std` were also stabilized
7483 during this cycle; about 75% of the non-deprecated API surface
7485 * The new [string pattern API][string-pattern] landed, which makes
7486 the string slice API much more internally consistent and flexible.
7487 * A new set of [generic conversion traits][conversion] replaced
7488 many existing ad hoc traits.
7489 * Generic numeric traits were [completely removed][num-traits]. This
7490 was made possible thanks to inherent methods for primitive types,
7491 and the removal gives maximal flexibility for designing a numeric
7492 hierarchy in the future.
7493 * The `Fn` traits are now related via [inheritance][fn-inherit]
7494 and provide ergonomic [blanket implementations][fn-blanket].
7495 * The `Index` and `IndexMut` traits were changed to
7496 [take the index by value][index-value], enabling code like
7497 `hash_map["string"]` to work.
7498 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7499 `Copy` data is known to be `Clone` as well.
7504 * Many errors now have extended explanations that can be accessed with
7505 the `--explain` flag to `rustc`.
7506 * Many new examples have been added to the standard library
7508 * rustdoc has received a number of improvements focused on completion
7510 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7511 * Much headway was made on ecosystem-wide CI, making it possible
7512 to [compare builds for breakage][ci-compare].
7515 [crates.io]: http://crates.io
7516 [clo]: https://github.com/rust-lang/rust/pull/24034
7517 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7518 [con]: https://github.com/rust-lang/rust/pull/23875
7519 [cr]: https://github.com/rust-lang/rust/pull/23419
7520 [fe]: https://github.com/rust-lang/rust/pull/23879
7521 [ie]: https://github.com/rust-lang/rust/pull/23300
7522 [inv]: https://github.com/rust-lang/rust/pull/23938
7523 [ios]: https://github.com/rust-lang/rust/pull/24133
7524 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7525 [lt]: https://github.com/rust-lang/rust/pull/24057
7526 [meth]: https://github.com/rust-lang/rust/pull/24056
7527 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7528 [po]: https://github.com/rust-lang/rust/pull/24270
7529 [sf]: https://github.com/rust-lang/rust/pull/24517
7530 [slp]: https://github.com/rust-lang/rust/pull/23949
7531 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7532 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7533 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7534 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7535 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7536 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7537 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7538 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7539 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7540 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7541 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7542 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7543 [reflect]: https://github.com/rust-lang/rust/pull/23712
7544 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7545 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7546 [index-value]: https://github.com/rust-lang/rust/pull/23601
7547 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7548 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7549 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7550 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7551 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7552 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7555 Version 1.0.0-alpha.2 (2015-02-20)
7556 =====================================
7558 * ~1300 changes, numerous bugfixes
7562 * The various I/O modules were [overhauled][io-rfc] to reduce
7563 unnecessary abstractions and provide better interoperation with
7564 the underlying platform. The old `io` module remains temporarily
7566 * The standard library now [participates in feature gating][feat],
7567 so use of unstable libraries now requires a `#![feature(...)]`
7568 attribute. The impact of this change is [described on the
7569 forum][feat-forum]. [RFC][feat-rfc].
7573 * `for` loops [now operate on the `IntoIterator` trait][into],
7574 which eliminates the need to call `.iter()`, etc. to iterate
7575 over collections. There are some new subtleties to remember
7576 though regarding what sort of iterators various types yield, in
7577 particular that `for foo in bar { }` yields values from a move
7578 iterator, destroying the original collection. [RFC][into-rfc].
7579 * Objects now have [default lifetime bounds][obj], so you don't
7580 have to write `Box<Trait+'static>` when you don't care about
7581 storing references. [RFC][obj-rfc].
7582 * In types that implement `Drop`, [lifetimes must outlive the
7583 value][drop]. This will soon make it possible to safely
7584 implement `Drop` for types where `#[unsafe_destructor]` is now
7585 required. Read the [gorgeous RFC][drop-rfc] for details.
7586 * The fully qualified <T as Trait>::X syntax lets you set the Self
7587 type for a trait method or associated type. [RFC][ufcs-rfc].
7588 * References to types that implement `Deref<U>` now [automatically
7589 coerce to references][deref] to the dereferenced type `U`,
7590 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7591 should eliminate many unsightly uses of `&*`, as when converting
7592 from references to vectors into references to
7593 slices. [RFC][deref-rfc].
7594 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7595 `|:|`) is obsolete and closure kind is inferred from context.
7596 * [`Self` is a keyword][Self].
7600 * The `Show` and `String` formatting traits [have been
7601 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7602 their related purposes. Automatically getting a string
7603 conversion to use with `format!("{:?}", something_to_debug)` is
7604 now written `#[derive(Debug)]`.
7605 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7606 OsStr}`, provide strings in platform-specific encodings for easier
7607 interop with system APIs. [RFC][osstr-rfc].
7608 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7609 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7610 creating raw pointers.
7614 * Certain long error messages of the form 'expected foo found bar'
7615 are now [split neatly across multiple
7616 lines][multiline]. Examples in the PR.
7617 * On Unix Rust can be [uninstalled][un] by running
7618 `/usr/local/lib/rustlib/uninstall.sh`.
7619 * The `#[rustc_on_unimplemented]` attribute, requiring the
7620 'on_unimplemented' feature, lets rustc [display custom error
7621 messages when a trait is expected to be implemented for a type
7626 * Rust is tested against a [LALR grammar][lalr], which parses
7627 almost all the Rust files that rustc does.
7629 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7630 [close]: https://github.com/rust-lang/rust/pull/21843
7631 [deref]: https://github.com/rust-lang/rust/pull/21351
7632 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7633 [drop]: https://github.com/rust-lang/rust/pull/21972
7634 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7635 [feat]: https://github.com/rust-lang/rust/pull/21248
7636 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7637 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7638 [fmt]: https://github.com/rust-lang/rust/pull/21457
7639 [into]: https://github.com/rust-lang/rust/pull/20790
7640 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7641 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7642 [lalr]: https://github.com/rust-lang/rust/pull/21452
7643 [multiline]: https://github.com/rust-lang/rust/pull/19870
7644 [obj]: https://github.com/rust-lang/rust/pull/22230
7645 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7646 [onun]: https://github.com/rust-lang/rust/pull/20889
7647 [osstr]: https://github.com/rust-lang/rust/pull/21488
7648 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7649 [Self]: https://github.com/rust-lang/rust/pull/22158
7650 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7651 [un]: https://github.com/rust-lang/rust/pull/22256
7654 Version 1.0.0-alpha (2015-01-09)
7655 ==================================
7657 * ~2400 changes, numerous bugfixes
7661 * The language itself is considered feature complete for 1.0,
7662 though there will be many usability improvements and bugfixes
7663 before the final release.
7664 * Nearly 50% of the public API surface of the standard library has
7665 been declared 'stable'. Those interfaces are unlikely to change
7667 * The long-running debate over integer types has been
7668 [settled][ints]: Rust will ship with types named `isize` and
7669 `usize`, rather than `int` and `uint`, for pointer-sized
7670 integers. Guidelines will be rolled out during the alpha cycle.
7671 * Most crates that are not `std` have been moved out of the Rust
7672 distribution into the Cargo ecosystem so they can evolve
7673 separately and don't need to be stabilized as quickly, including
7674 'time', 'getopts', 'num', 'regex', and 'term'.
7675 * Documentation continues to be expanded with more API coverage, more
7676 examples, and more in-depth explanations. The guides have been
7677 consolidated into [The Rust Programming Language][trpl].
7678 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7679 * All official Rust binary installers now come with [Cargo], the
7680 Rust package manager.
7684 * Closures have been [completely redesigned][unboxed] to be
7685 implemented in terms of traits, can now be used as generic type
7686 bounds and thus monomorphized and inlined, or via an opaque
7687 pointer (boxed) as in the old system. The new system is often
7688 referred to as 'unboxed' closures.
7689 * Traits now support [associated types][assoc], allowing families
7690 of related types to be defined together and used generically in
7692 * Enum variants are [namespaced by their type names][enum].
7693 * [`where` clauses][where] provide a more versatile and attractive
7694 syntax for specifying generic bounds, though the previous syntax
7696 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7698 * Rust [no longer has a runtime][rt] of any description, and only
7699 supports OS threads, not green threads.
7700 * At long last, Rust has been overhauled for 'dynamically-sized
7701 types' ([DST]), which integrates 'fat pointers' (object types,
7702 arrays, and `str`) more deeply into the type system, making it
7704 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7705 `..j` that produce range types and which, when combined with the
7706 `Index` operator and multidispatch, leads to a convenient slice
7708 * The new range syntax revealed an ambiguity in the fixed-length
7709 array syntax, so now fixed length arrays [are written `[T;
7711 * The `Copy` trait is no longer implemented automatically. Unsafe
7712 pointers no longer implement `Sync` and `Send` so types
7713 containing them don't automatically either. `Sync` and `Send`
7714 are now 'unsafe traits' so one can "forcibly" implement them via
7715 `unsafe impl` if a type confirms to the requirements for them
7716 even though the internals do not (e.g. structs containing unsafe
7717 pointers like `Arc`). These changes are intended to prevent some
7718 footguns and are collectively known as [opt-in built-in
7719 traits][oibit] (though `Sync` and `Send` will soon become pure
7720 library types unknown to the compiler).
7721 * Operator traits now take their operands [by value][ops], and
7722 comparison traits can use multidispatch to compare one type
7723 against multiple other types, allowing e.g. `String` to be
7724 compared with `&str`.
7725 * `if let` and `while let` are no longer feature-gated.
7726 * Rust has adopted a more [uniform syntax for escaping unicode
7727 characters][unicode].
7728 * `macro_rules!` [has been declared stable][mac]. Though it is a
7729 flawed system it is sufficiently popular that it must be usable
7730 for 1.0. Effort has gone into [future-proofing][mac-future] it
7731 in ways that will allow other macro systems to be developed in
7732 parallel, and won't otherwise impact the evolution of the
7734 * The prelude has been [pared back significantly][prelude] such
7735 that it is the minimum necessary to support the most pervasive
7736 code patterns, and through [generalized where clauses][where]
7737 many of the prelude extension traits have been consolidated.
7738 * Rust's rudimentary reflection [has been removed][refl], as it
7739 incurred too much code generation for little benefit.
7740 * [Struct variants][structvars] are no longer feature-gated.
7741 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7742 known as 'higher-ranked trait bounds', this crucially allows
7743 unboxed closures to work.
7744 * Macros invocations surrounded by parens or square brackets and
7745 not terminated by a semicolon are [parsed as
7746 expressions][macros], which makes expressions like `vec![1i32,
7747 2, 3].len()` work as expected.
7748 * Trait objects now implement their traits automatically, and
7749 traits that can be coerced to objects now must be [object
7751 * Automatically deriving traits is now done with `#[derive(...)]`
7752 not `#[deriving(...)]` for [consistency with other naming
7753 conventions][derive].
7754 * Importing the containing module or enum at the same time as
7755 items or variants they contain is [now done with `self` instead
7756 of `mod`][self], as in use `foo::{self, bar}`
7757 * Glob imports are no longer feature-gated.
7758 * The `box` operator and `box` patterns have been feature-gated
7759 pending a redesign. For now unique boxes should be allocated
7760 like other containers, with `Box::new`.
7764 * A [series][coll1] of [efforts][coll2] to establish
7765 [conventions][coll3] for collections types has resulted in API
7766 improvements throughout the standard library.
7767 * New [APIs for error handling][err] provide ergonomic interop
7768 between error types, and [new conventions][err-conv] describe
7769 more clearly the recommended error handling strategies in Rust.
7770 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7771 it is easier to discuss failure in the context of error handling
7772 without making clarifications as to whether you are referring to
7773 the 'fail' macro or failure more generally.
7774 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7775 syscall when available.
7776 * The 'serialize' crate has been renamed 'rustc-serialize' and
7777 moved out of the distribution to Cargo. Although it is widely
7778 used now, it is expected to be superseded in the near future.
7779 * The `Show` formatter, typically implemented with
7780 `#[derive(Show)]` is [now requested with the `{:?}`
7781 specifier][show] and is intended for use by all types, for uses
7782 such as `println!` debugging. The new `String` formatter must be
7783 implemented by hand, uses the `{}` specifier, and is intended
7784 for full-fidelity conversions of things that can logically be
7785 represented as strings.
7789 * [Flexible target specification][flex] allows rustc's code
7790 generation to be configured to support otherwise-unsupported
7792 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7793 respective debuggers with Rust-appropriate pretty-printing.
7794 * The Windows installation of Rust is distributed with the
7795 MinGW components currently required to link binaries on that
7800 * Nullable enum optimizations have been extended to more types so
7801 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7802 space than the inner types themselves.
7803 * Work has begun on supporting AArch64.
7805 [Cargo]: https://crates.io
7806 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7807 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7808 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7809 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7810 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7811 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7812 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7813 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7814 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7815 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7816 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7817 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7818 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7819 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7820 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7821 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7822 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7823 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7824 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7825 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7826 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7827 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7828 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7829 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7830 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7831 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7832 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7833 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7834 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7835 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7836 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7837 [trpl]: https://doc.rust-lang.org/book/index.html
7838 [rbe]: http://rustbyexample.com/
7841 Version 0.12.0 (2014-10-09)
7842 =============================
7844 * ~1900 changes, numerous bugfixes
7848 * The introductory documentation (now called The Rust Guide) has
7849 been completely rewritten, as have a number of supplementary
7851 * Rust's package manager, Cargo, continues to improve and is
7852 sometimes considered to be quite awesome.
7853 * Many API's in `std` have been reviewed and updated for
7854 consistency with the in-development Rust coding
7855 guidelines. The standard library documentation tracks
7856 stabilization progress.
7857 * Minor libraries have been moved out-of-tree to the rust-lang org
7858 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7859 be installed with Cargo.
7860 * Lifetime elision allows lifetime annotations to be left off of
7861 function declarations in many common scenarios.
7862 * Rust now works on 64-bit Windows.
7865 * Indexing can be overloaded with the `Index` and `IndexMut`
7867 * The `if let` construct takes a branch only if the `let` pattern
7868 matches, currently behind the 'if_let' feature gate.
7869 * 'where clauses', a more flexible syntax for specifying trait
7870 bounds that is more aesthetic, have been added for traits and
7871 free functions. Where clauses will in the future make it
7872 possible to constrain associated types, which would be
7873 impossible with the existing syntax.
7874 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7875 the 'slicing_syntax' feature gate, and can be overloaded with
7876 the `Slice` or `SliceMut` traits.
7877 * The syntax for matching of sub-slices has been changed to use a
7878 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7879 consistency with other uses of `..` and to future-proof
7880 potential additional uses of the syntax.
7881 * The syntax for matching inclusive ranges in patterns has changed
7882 from `0..3` to `0...4` to be consistent with the exclusive range
7884 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7885 c]`) has been put behind the 'advanced_slice_patterns' feature
7886 gate and may be removed in the future.
7887 * Components of tuples and tuple structs can be extracted using
7888 the `value.0` syntax, currently behind the `tuple_indexing`
7890 * The `#[crate_id]` attribute is no longer supported; versioning
7891 is handled by the package manager.
7892 * Renaming crate imports are now written `extern crate foo as bar`
7893 instead of `extern crate bar = foo`.
7894 * Renaming use statements are now written `use foo as bar` instead
7896 * `let` and `match` bindings and argument names in macros are now
7898 * The new, more efficient, closure types ('unboxed closures') have
7899 been added under a feature gate, 'unboxed_closures'. These will
7900 soon replace the existing closure types, once higher-ranked
7901 trait lifetimes are added to the language.
7902 * `move` has been added as a keyword, for indicating closures
7903 that capture by value.
7904 * Mutation and assignment is no longer allowed in pattern guards.
7905 * Generic structs and enums can now have trait bounds.
7906 * The `Share` trait is now called `Sync` to free up the term
7907 'shared' to refer to 'shared reference' (the default reference
7909 * Dynamically-sized types have been mostly implemented,
7910 unifying the behavior of fat-pointer types with the rest of the
7912 * As part of dynamically-sized types, the `Sized` trait has been
7913 introduced, which qualifying types implement by default, and
7914 which type parameters expect by default. To specify that a type
7915 parameter does not need to be sized, write `<Sized? T>`. Most
7916 types are `Sized`, notable exceptions being unsized arrays
7917 (`[T]`) and trait types.
7918 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7919 * Lifetime bounds can now be applied to type parameters and object
7921 * The old, reference counted GC type, `Gc<T>` which was once
7922 denoted by the `@` sigil, has finally been removed. GC will be
7923 revisited in the future.
7926 * Library documentation has been improved for a number of modules.
7927 * Bit-vectors, collections::bitv has been modernized.
7928 * The url crate is deprecated in favor of
7929 http://github.com/servo/rust-url, which can be installed with
7931 * Most I/O stream types can be cloned and subsequently closed from
7933 * A `std::time::Duration` type has been added for use in I/O
7934 methods that rely on timers, as well as in the 'time' crate's
7935 `Timespec` arithmetic.
7936 * The runtime I/O abstraction layer that enabled the green thread
7937 scheduler to do non-thread-blocking I/O has been removed, along
7938 with the libuv-based implementation employed by the green thread
7939 scheduler. This will greatly simplify the future I/O work.
7940 * `collections::btree` has been rewritten to have a more
7941 idiomatic and efficient design.
7944 * rustdoc output now indicates the stability levels of API's.
7945 * The `--crate-name` flag can specify the name of the crate
7946 being compiled, like `#[crate_name]`.
7947 * The `-C metadata` specifies additional metadata to hash into
7948 symbol names, and `-C extra-filename` specifies additional
7949 information to put into the output filename, for use by the
7950 package manager for versioning.
7951 * debug info generation has continued to improve and should be
7952 more reliable under both gdb and lldb.
7953 * rustc has experimental support for compiling in parallel
7954 using the `-C codegen-units` flag.
7955 * rustc no longer encodes rpath information into binaries by
7959 * Stack usage has been optimized with LLVM lifetime annotations.
7960 * Official Rust binaries on Linux are more compatible with older
7961 kernels and distributions, built on CentOS 5.10.
7964 Version 0.11.0 (2014-07-02)
7965 ==========================
7967 * ~1700 changes, numerous bugfixes
7970 * ~[T] has been removed from the language. This type is superseded by
7972 * ~str has been removed from the language. This type is superseded by
7974 * ~T has been removed from the language. This type is superseded by the
7976 * @T has been removed from the language. This type is superseded by the
7977 standard library's std::gc::Gc<T> type.
7978 * Struct fields are now all private by default.
7979 * Vector indices and shift amounts are both required to be a `uint`
7980 instead of any integral type.
7981 * Byte character, byte string, and raw byte string literals are now all
7982 supported by prefixing the normal literal with a `b`.
7983 * Multiple ABIs are no longer allowed in an ABI string
7984 * The syntax for lifetimes on closures/procedures has been tweaked
7985 slightly: `<'a>|A, B|: 'b + K -> T`
7986 * Floating point modulus has been removed from the language; however it
7987 is still provided by a library implementation.
7988 * Private enum variants are now disallowed.
7989 * The `priv` keyword has been removed from the language.
7990 * A closure can no longer be invoked through a &-pointer.
7991 * The `use foo, bar, baz;` syntax has been removed from the language.
7992 * The transmute intrinsic no longer works on type parameters.
7993 * Statics now allow blocks/items in their definition.
7994 * Trait bounds are separated from objects with + instead of : now.
7995 * Objects can no longer be read while they are mutably borrowed.
7996 * The address of a static is now marked as insignificant unless the
7997 #[inline(never)] attribute is placed it.
7998 * The #[unsafe_destructor] attribute is now behind a feature gate.
7999 * Struct literals are no longer allowed in ambiguous positions such as
8000 if, while, match, and for..in.
8001 * Declaration of lang items and intrinsics are now feature-gated by
8003 * Integral literals no longer default to `int`, and floating point
8004 literals no longer default to `f64`. Literals must be suffixed with an
8005 appropriate type if inference cannot determine the type of the
8007 * The Box<T> type is no longer implicitly borrowed to &mut T.
8008 * Procedures are now required to not capture borrowed references.
8011 * The standard library is now a "facade" over a number of underlying
8012 libraries. This means that development on the standard library should
8013 be speedier due to smaller crates, as well as a clearer line between
8015 * A new library, libcore, lives under the standard library's facade
8016 which is Rust's "0-assumption" library, suitable for embedded and
8017 kernel development for example.
8018 * A regex crate has been added to the standard distribution. This crate
8019 includes statically compiled regular expressions.
8020 * The unwrap/unwrap_err methods on Result require a Show bound for
8021 better error messages.
8022 * The return types of the std::comm primitives have been centralized
8023 around the Result type.
8024 * A number of I/O primitives have gained the ability to time out their
8026 * A number of I/O primitives have gained the ability to close their
8027 reading/writing halves to cancel pending operations.
8028 * Reverse iterator methods have been removed in favor of `rev()` on
8029 their forward-iteration counterparts.
8030 * A bitflags! macro has been added to enable easy interop with C and
8031 management of bit flags.
8032 * A debug_assert! macro is now provided which is disabled when
8033 `--cfg ndebug` is passed to the compiler.
8034 * A graphviz crate has been added for creating .dot files.
8035 * The std::cast module has been migrated into std::mem.
8036 * The std::local_data api has been migrated from freestanding functions
8037 to being based on methods.
8038 * The Pod trait has been renamed to Copy.
8039 * jemalloc has been added as the default allocator for types.
8040 * The API for allocating memory has been changed to use proper alignment
8041 and sized deallocation
8042 * Connecting a TcpStream or binding a TcpListener is now based on a
8043 string address and a u16 port. This allows connecting to a hostname as
8045 * The Reader trait now contains a core method, read_at_least(), which
8046 correctly handles many repeated 0-length reads.
8047 * The process-spawning API is now centered around a builder-style
8049 * The :? printing qualifier has been moved from the standard library to
8050 an external libdebug crate.
8051 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8052 have been renamed to Eq/Ord.
8053 * The select/plural methods have been removed from format!. The escapes
8054 for { and } have also changed from \{ and \} to {{ and }},
8056 * The TaskBuilder API has been re-worked to be a true builder, and
8057 extension traits for spawning native/green tasks have been added.
8060 * All breaking changes to the language or libraries now have their
8061 commit message annotated with `[breaking-change]` to allow for easy
8062 discovery of breaking changes.
8063 * The compiler will now try to suggest how to annotate lifetimes if a
8064 lifetime-related error occurs.
8065 * Debug info continues to be improved greatly with general bug fixes and
8066 better support for situations like link time optimization (LTO).
8067 * Usage of syntax extensions when cross-compiling has been fixed.
8068 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8069 -fdata-sections and --gc-sections has been enabled by default
8070 * The compiler is now stricter about where it will load module files
8071 from when a module is declared via `mod foo;`.
8072 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8073 Syntax extensions are now discovered via a "plugin registrar" type
8074 which will be extended in the future to other various plugins.
8075 * Lints have been restructured to allow for dynamically loadable lints.
8076 * A number of rustdoc improvements:
8077 * The HTML output has been visually redesigned.
8078 * Markdown is now powered by hoedown instead of sundown.
8079 * Searching heuristics have been greatly improved.
8080 * The search index has been reduced in size by a great amount.
8081 * Cross-crate documentation via `pub use` has been greatly improved.
8082 * Primitive types are now hyperlinked and documented.
8083 * Documentation has been moved from static.rust-lang.org/doc to
8085 * A new sandbox, play.rust-lang.org, is available for running and
8086 sharing rust code examples on-line.
8087 * Unused attributes are now more robustly warned about.
8088 * The dead_code lint now warns about unused struct fields.
8089 * Cross-compiling to iOS is now supported.
8090 * Cross-compiling to mipsel is now supported.
8091 * Stability attributes are now inherited by default and no longer apply
8092 to intra-crate usage, only inter-crate usage.
8093 * Error message related to non-exhaustive match expressions have been
8097 Version 0.10 (2014-04-03)
8098 =========================
8100 * ~1500 changes, numerous bugfixes
8103 * A new RFC process is now in place for modifying the language.
8104 * Patterns with `@`-pointers have been removed from the language.
8105 * Patterns with unique vectors (`~[T]`) have been removed from the
8107 * Patterns with unique strings (`~str`) have been removed from the
8109 * `@str` has been removed from the language.
8110 * `@[T]` has been removed from the language.
8111 * `@self` has been removed from the language.
8112 * `@Trait` has been removed from the language.
8113 * Headers on `~` allocations which contain `@` boxes inside the type for
8114 reference counting have been removed.
8115 * The semantics around the lifetimes of temporary expressions have changed,
8116 see #3511 and #11585 for more information.
8117 * Cross-crate syntax extensions are now possible, but feature gated. See
8118 #11151 for more information. This includes both `macro_rules!` macros as
8119 well as syntax extensions such as `format!`.
8120 * New lint modes have been added, and older ones have been turned on to be
8122 * Unnecessary parentheses
8125 * Uppercase variables
8126 * Publicly visible private types
8127 * `#[deriving]` with raw pointers
8128 * Unsafe functions can no longer be coerced to closures.
8129 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8130 * The `#[simd]` attribute is now behind a feature gate.
8131 * Visibility is no longer allowed on `extern crate` statements, and
8132 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8133 * Trailing commas are now allowed in argument lists and tuple patterns.
8134 * The `do` keyword has been removed, it is now a reserved keyword.
8135 * Default type parameters have been implemented, but are feature gated.
8136 * Borrowed variables through captures in closures are now considered soundly.
8137 * `extern mod` is now `extern crate`
8138 * The `Freeze` trait has been removed.
8139 * The `Share` trait has been added for types that can be shared among
8141 * Labels in macros are now hygienic.
8142 * Expression/statement macro invocations can be delimited with `{}` now.
8143 * Treatment of types allowed in `static mut` locations has been tweaked.
8144 * The `*` and `.` operators are now overloadable through the `Deref` and
8146 * `~Trait` and `proc` no longer have `Send` bounds by default.
8147 * Partial type hints are now supported with the `_` type marker.
8148 * An `Unsafe` type was introduced for interior mutability. It is now
8149 considered undefined to transmute from `&T` to `&mut T` without using the
8151 * The #[linkage] attribute was implemented for extern statics/functions.
8152 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8153 * `Pod` was renamed to `Copy`.
8156 * The `libextra` library has been removed. It has now been decomposed into
8157 component libraries with smaller and more focused nuggets of
8158 functionality. The full list of libraries can be found on the
8159 documentation index page.
8160 * std: `std::condition` has been removed. All I/O errors are now propagated
8161 through the `Result` type. In order to assist with error handling, a
8162 `try!` macro for unwrapping errors with an early return and a lint for
8163 unused results has been added. See #12039 for more information.
8164 * std: The `vec` module has been renamed to `slice`.
8165 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8166 This will become the only growable vector in the future.
8167 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8168 are now found at `std::io::BufferedReader` instead of
8169 `std::io::buffered::BufferedReader`.
8170 * std: `print` and `println` are no longer in the prelude, the `print!` and
8171 `println!` macros are intended to be used instead.
8172 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8173 attempts to statically prevent cycles.
8174 * std: The standard distribution is adopting the policy of pushing failure
8175 to the user rather than failing in libraries. Many functions (such as
8176 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8177 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8178 deriving mode: `#[deriving(Show)]`.
8179 * std: `ToStr` is now implemented for all types implementing `Show`.
8180 * std: The formatting trait methods now take `&self` instead of `&T`
8181 * std: The `invert()` method on iterators has been renamed to `rev()`
8182 * std: `std::num` has seen a reduction in the genericity of its traits,
8183 consolidating functionality into a few core traits.
8184 * std: Backtraces are now printed on task failure if the environment
8185 variable `RUST_BACKTRACE` is present.
8186 * std: Naming conventions for iterators have been standardized. More details
8187 can be found on the wiki's style guide.
8188 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8189 still implement the function.
8190 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8191 * std: `assert_approx_eq!` has been removed
8192 * std: The `e` and `E` formatting specifiers for floats have been added to
8193 print them in exponential notation.
8194 * std: The `Times` trait has been removed
8195 * std: Indications of variance and opting out of builtin bounds is done
8196 through marker types in `std::kinds::marker` now
8197 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8198 `#[deriving(Hash)]` is now possible.
8199 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8200 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8201 * std: `Chan::new` is now `channel()`.
8202 * std: A new synchronous channel type has been implemented.
8203 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8204 * std: `hashmap` and `trie` have been moved to `libcollections`
8205 * std: `run` has been rolled into `io::process`
8206 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8207 * std: The equality and comparison traits have seen some reorganization.
8208 * std: `rand` has moved to `librand`.
8209 * std: `to_{lower,upper}case` has been implemented for `char`.
8210 * std: Logging has been moved to `liblog`.
8211 * collections: `HashMap` has been rewritten for higher performance and less
8213 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8214 it can be booted manually. The runtime guide has more information and
8216 * native: All I/O functionality except signals has been implemented.
8217 * green: Task spawning with `libgreen` has been optimized with stack caching
8218 and various trimming of code.
8219 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8220 * sync: The `extra::sync` module has been updated to modern rust (and moved
8221 to the `sync` library), tweaking and improving various interfaces while
8222 dropping redundant functionality.
8223 * sync: A new `Barrier` type has been added to the `sync` library.
8224 * sync: An efficient mutex for native and green tasks has been implemented.
8225 * serialize: The `base64` module has seen some improvement. It treats
8226 newlines better, has non-string error values, and has seen general
8228 * fourcc: A `fourcc!` macro was introduced
8229 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8230 hexadecimal literal.
8233 * `rustpkg` has been deprecated and removed from the main repository. Its
8234 replacement, `cargo`, is under development.
8235 * Nightly builds of rust are now available
8236 * The memory usage of rustc has been improved many times throughout this
8238 * The build process supports disabling rpath support for the rustc binary
8240 * Code generation has improved in some cases, giving more information to the
8241 LLVM optimization passes to enable more extensive optimizations.
8242 * Debuginfo compatibility with lldb on OSX has been restored.
8243 * The master branch is now gated on an android bot, making building for
8244 android much more reliable.
8245 * Output flags have been centralized into one `--emit` flag.
8246 * Crate type flags have been centralized into one `--crate-type` flag.
8247 * Codegen flags have been consolidated behind a `-C` flag.
8248 * Linking against outdated crates now has improved error messages.
8249 * Error messages with lifetimes will often suggest how to annotate the
8250 function to fix the error.
8251 * Many more types are documented in the standard library, and new guides
8253 * Many `rustdoc` improvements:
8254 * code blocks are syntax highlighted.
8255 * render standalone markdown files.
8256 * the --test flag tests all code blocks by default.
8257 * exported macros are displayed.
8258 * re-exported types have their documentation inlined at the location of the
8260 * search works across crates that have been rendered to the same output
8264 Version 0.9 (2014-01-09)
8265 ==========================
8267 * ~1800 changes, numerous bugfixes
8270 * The `float` type has been removed. Use `f32` or `f64` instead.
8271 * A new facility for enabling experimental features (feature gating) has
8272 been added, using the crate-level `#[feature(foo)]` attribute.
8273 * Managed boxes (@) are now behind a feature gate
8274 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8275 standard library's `Gc` or `Rc` types instead.
8276 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8277 * Jumping back to the top of a loop is now done with `continue` instead of
8279 * Strings can no longer be mutated through index assignment.
8280 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8281 hash delimiters, as in `r###"foo"###`.
8282 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8284 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8285 * `@fn`s have been removed.
8286 * `do` only works with procs in order to make it obvious what the cost
8288 * Single-element tuple-like structs can no longer be dereferenced to
8289 obtain the inner value. A more comprehensive solution for overloading
8290 the dereference operator will be provided in the future.
8291 * The `#[link(...)]` attribute has been replaced with
8292 `#[crate_id = "name#vers"]`.
8293 * Empty `impl`s must be terminated with empty braces and may not be
8294 terminated with a semicolon.
8295 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8296 no longer has any special meaning.
8297 * The old `fmt!` string formatting macro has been removed.
8298 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8299 `print!` and `println!`.
8300 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8301 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8302 `extern mod foo = "bar"` instead.
8303 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8304 * Macros can have attributes.
8305 * Macros can expand to items with attributes.
8306 * Macros can expand to multiple items.
8307 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8308 * Comments may be nested.
8309 * Values automatically coerce to trait objects they implement, without
8311 * Enum discriminants are no longer an entire word but as small as needed to
8312 contain all the variants. The `repr` attribute can be used to override
8313 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8314 `#[repr(C)]` to match C enums.
8315 * Non-string literals are not allowed in attributes (they never worked).
8316 * The FFI now supports variadic functions.
8317 * Octal numeric literals, as in `0o7777`.
8318 * The `concat!` syntax extension performs compile-time string concatenation.
8319 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8320 removed as Rust no longer uses segmented stacks.
8321 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8322 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8323 not `*`; ignoring remaining fields of a struct is also done with `..`,
8324 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8325 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8326 * `rustc` supports the "system" calling convention, which defaults to the
8327 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8329 * The `type_overflow` lint (default: warn) checks literals for overflow.
8330 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8331 * The `attribute_usage` lint (default: warn) warns about unknown
8333 * The `unknown_features` lint (default: warn) warns about unknown
8335 * The `dead_code` lint (default: warn) checks for dead code.
8336 * Rust libraries can be linked statically to one another
8337 * `#[link_args]` is behind the `link_args` feature gate.
8338 * Native libraries are now linked with `#[link(name = "foo")]`
8339 * Native libraries can be statically linked to a rust crate
8340 (`#[link(name = "foo", kind = "static")]`).
8341 * Native OS X frameworks are now officially supported
8342 (`#[link(name = "foo", kind = "framework")]`).
8343 * The `#[thread_local]` attribute creates thread-local (not task-local)
8344 variables. Currently behind the `thread_local` feature gate.
8345 * The `return` keyword may be used in closures.
8346 * Types that can be copied via a memcpy implement the `Pod` kind.
8347 * The `cfg` attribute can now be used on struct fields and enum variants.
8350 * std: The `option` and `result` API's have been overhauled to make them
8351 simpler, more consistent, and more composable.
8352 * std: The entire `std::io` module has been replaced with one that is
8353 more comprehensive and that properly interfaces with the underlying
8354 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8356 * std: `io::util` contains a number of useful implementations of
8357 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8358 `ZeroReader`, `TeeReader`.
8359 * std: The reference counted pointer type `extra::rc` moved into std.
8360 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8361 just a wrapper around it).
8362 * std: The `Either` type has been removed.
8363 * std: `fmt::Default` can be implemented for any type to provide default
8364 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8365 * std: The `rand` API continues to be tweaked.
8366 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8367 on failure in gdb, is now named `rust_fail`.
8368 * std: The `each_key` and `each_value` methods on `HashMap` have been
8369 replaced by the `keys` and `values` iterators.
8370 * std: Functions dealing with type size and alignment have moved from the
8371 `sys` module to the `mem` module.
8372 * std: The `path` module was written and API changed.
8373 * std: `str::from_utf8` has been changed to cast instead of allocate.
8374 * std: `starts_with` and `ends_with` methods added to vectors via the
8375 `ImmutableEqVector` trait, which is in the prelude.
8376 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8377 if the index is out of bounds.
8378 * std: Task failure no longer propagates between tasks, as the model was
8379 complex, expensive, and incompatible with thread-based tasks.
8380 * std: The `Any` type can be used for dynamic typing.
8381 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8383 * std: Methods that produce iterators generally do not have an `_iter`
8385 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8386 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8387 * std: `util::ignore` renamed to `prelude::drop`.
8388 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8390 * std: `vec::raw` has seen a lot of cleanup and API changes.
8391 * std: The standard library no longer includes any C++ code, and very
8392 minimal C, eliminating the dependency on libstdc++.
8393 * std: Runtime scheduling and I/O functionality has been factored out into
8394 extensible interfaces and is now implemented by two different crates:
8395 libnative, for native threading and I/O; and libgreen, for green threading
8396 and I/O. This paves the way for using the standard library in more limited
8397 embedded environments.
8398 * std: The `comm` module has been rewritten to be much faster, have a
8399 simpler, more consistent API, and to work for both native and green
8401 * std: All libuv dependencies have been moved into the rustuv crate.
8402 * native: New implementations of runtime scheduling on top of OS threads.
8403 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8405 * green: The green thread scheduler and message passing types are almost
8407 * extra: The `flatpipes` module had bitrotted and was removed.
8408 * extra: All crypto functions have been removed and Rust now has a policy of
8409 not reimplementing crypto in the standard library. In the future crypto
8410 will be provided by external crates with bindings to established libraries.
8411 * extra: `c_vec` has been modernized.
8412 * extra: The `sort` module has been removed. Use the `sort` method on
8416 * The `rust` and `rusti` commands have been removed, due to lack of
8418 * `rustdoc` was completely rewritten.
8419 * `rustdoc` can test code examples in documentation.
8420 * `rustpkg` can test packages with the argument, 'test'.
8421 * `rustpkg` supports arbitrary dependencies, including C libraries.
8422 * `rustc`'s support for generating debug info is improved again.
8423 * `rustc` has better error reporting for unbalanced delimiters.
8424 * `rustc`'s JIT support was removed due to bitrot.
8425 * Executables and static libraries can be built with LTO (-Z lto)
8426 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8430 Version 0.8 (2013-09-26)
8431 ============================
8433 * ~2200 changes, numerous bugfixes
8436 * The `for` loop syntax has changed to work with the `Iterator` trait.
8437 * At long last, unwinding works on Windows.
8438 * Default methods are ready for use.
8439 * Many trait inheritance bugs fixed.
8440 * Owned and borrowed trait objects work more reliably.
8441 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8442 * rustc can omit emission of code for the `debug!` macro if it is passed
8444 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8445 for foo.rs, then foo/mod.rs, and will generate an error when both are
8447 * Strings no longer contain trailing nulls. The new `std::c_str` module
8448 provides new mechanisms for converting to C strings.
8449 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8450 * The FFI has been overhauled such that foreign functions are called directly,
8451 instead of through a stack-switching wrapper.
8452 * Calling a foreign function must be done through a Rust function with the
8453 `#[fixed_stack_segment]` attribute.
8454 * The `externfn!` macro can be used to declare both a foreign function and
8455 a `#[fixed_stack_segment]` wrapper at once.
8456 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8457 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8458 * `priv` is disallowed everywhere except for struct fields and enum variants.
8459 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8460 * `ref` bindings in irrefutable patterns work correctly now.
8461 * `char` is now prevented from containing invalid code points.
8462 * Casting to `bool` is no longer allowed.
8463 * `\0` is now accepted as an escape in chars and strings.
8464 * `yield` is a reserved keyword.
8465 * `typeof` is a reserved keyword.
8466 * Crates may be imported by URL with `extern mod foo = "url";`.
8467 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8468 * Static vectors can be initialized with repeating elements,
8469 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8470 * Static structs can be initialized with functional record update,
8471 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8472 * `cfg!` can be used to conditionally execute code based on the crate
8473 configuration, similarly to `#[cfg(...)]`.
8474 * The `unnecessary_qualification` lint detects unneeded module
8475 prefixes (default: allow).
8476 * Arithmetic operations have been implemented on the SIMD types in
8477 `std::unstable::simd`.
8478 * Exchange allocation headers were removed, reducing memory usage.
8479 * `format!` implements a completely new, extensible, and higher-performance
8480 string formatting system. It will replace `fmt!`.
8481 * `print!` and `println!` write formatted strings (using the `format!`
8482 extension) to stdout.
8483 * `write!` and `writeln!` write formatted strings (using the `format!`
8484 extension) to the new Writers in `std::rt::io`.
8485 * The library section in which a function or static is placed may
8486 be specified with `#[link_section = "..."]`.
8487 * The `proto!` syntax extension for defining bounded message protocols
8489 * `macro_rules!` is hygienic for `let` declarations.
8490 * The `#[export_name]` attribute specifies the name of a symbol.
8491 * `unreachable!` can be used to indicate unreachable code, and fails
8495 * std: Transitioned to the new runtime, written in Rust.
8496 * std: Added an experimental I/O library, `rt::io`, based on the new
8498 * std: A new generic `range` function was added to the prelude, replacing
8499 `uint::range` and friends.
8500 * std: `range_rev` no longer exists. Since range is an iterator it can be
8501 reversed with `range(lo, hi).invert()`.
8502 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8503 renamed to `unwrap_or`.
8504 * std: The `iterator` module was renamed to `iter`.
8505 * std: Integral types now support the `checked_add`, `checked_sub`, and
8506 `checked_mul` operations for detecting overflow.
8507 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8509 * std: Methods are standardizing on conventions for casting methods:
8510 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8512 * std: The `CString` type in `c_str` provides new ways to convert to and
8514 * std: `DoubleEndedIterator` can yield elements in two directions.
8515 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8517 * std: `str::from_bytes` renamed to `str::from_utf8`.
8518 * std: `pop_opt` and `shift_opt` methods added to vectors.
8519 * std: The task-local data interface no longer uses @, and keys are
8520 no longer function pointers.
8521 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8522 * std: Added `SharedPort` to `comm`.
8523 * std: `Eq` has a default method for `ne`; only `eq` is required
8525 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8526 is required in implementations.
8527 * std: `is_utf8` performance is improved, impacting many string functions.
8528 * std: `os::MemoryMap` provides cross-platform mmap.
8529 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8530 are not 'in-bounds' are considered undefined.
8531 * std: Many freestanding functions in `vec` removed in favor of methods.
8532 * std: Many freestanding functions on scalar types removed in favor of
8534 * std: Many options to task builders were removed since they don't make
8535 sense in the new scheduler design.
8536 * std: More containers implement `FromIterator` so can be created by the
8538 * std: More complete atomic types in `unstable::atomics`.
8539 * std: `comm::PortSet` removed.
8540 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8541 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8542 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8543 default implementations.
8544 * std: Various `from_str` functions were removed in favor of a generic
8545 `from_str` which is available in the prelude.
8546 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8547 * extra: `dlist`, the doubly-linked list was modernized.
8548 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8549 * extra: Added `glob` module, replacing `std::os::glob`.
8550 * extra: `rope` was removed.
8551 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8552 * extra: `net`, and `timer` were removed. The experimental replacements
8553 are `std::rt::io::net` and `std::rt::io::timer`.
8554 * extra: Iterators implemented for `SmallIntMap`.
8555 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8556 * extra: `SmallIntSet` removed. Use `BitvSet`.
8557 * extra: Performance of JSON parsing greatly improved.
8558 * extra: `semver` updated to SemVer 2.0.0.
8559 * extra: `term` handles more terminals correctly.
8560 * extra: `dbg` module removed.
8561 * extra: `par` module removed.
8562 * extra: `future` was cleaned up, with some method renames.
8563 * extra: Most free functions in `getopts` were converted to methods.
8566 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8567 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8568 similarly to gcc's `--march` flag.
8569 * rustc's performance compiling small crates is much better.
8570 * rustpkg has received many improvements.
8571 * rustpkg supports git tags as package IDs.
8572 * rustpkg builds into target-specific directories so it can be used for
8574 * The number of concurrent test tasks is controlled by the environment
8575 variable RUST_TEST_TASKS.
8576 * The test harness can now report metrics for benchmarks.
8577 * All tools have man pages.
8578 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8579 * The runtime uses jemalloc for allocations.
8580 * Segmented stacks are temporarily disabled as part of the transition to
8581 the new runtime. Stack overflows are possible!
8582 * A new documentation backend, rustdoc_ng, is available for use. It is
8583 still invoked through the normal `rustdoc` command.
8586 Version 0.7 (2013-07-03)
8587 =======================
8589 * ~2000 changes, numerous bugfixes
8592 * `impl`s no longer accept a visibility qualifier. Put them on methods
8594 * The borrow checker has been rewritten with flow-sensitivity, fixing
8595 many bugs and inconveniences.
8596 * The `self` parameter no longer implicitly means `&'self self`,
8597 and can be explicitly marked with a lifetime.
8598 * Overloadable compound operators (`+=`, etc.) have been temporarily
8599 removed due to bugs.
8600 * The `for` loop protocol now requires `for`-iterators to return `bool`
8601 so they compose better.
8602 * The `Durable` trait is replaced with the `'static` bounds.
8603 * Trait default methods work more often.
8604 * Structs with the `#[packed]` attribute have byte alignment and
8605 no padding between fields.
8606 * Type parameters bound by `Copy` must now be copied explicitly with
8608 * It is now illegal to move out of a dereferenced unsafe pointer.
8609 * `Option<~T>` is now represented as a nullable pointer.
8610 * `@mut` does dynamic borrow checks correctly.
8611 * The `main` function is only detected at the topmost level of the crate.
8612 The `#[main]` attribute is still valid anywhere.
8613 * Struct fields may no longer be mutable. Use inherited mutability.
8614 * The `#[no_send]` attribute makes a type that would otherwise be
8616 * The `#[no_freeze]` attribute makes a type that would otherwise be
8618 * Unbounded recursion will abort the process after reaching the limit
8619 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8620 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8621 are never implicitly copyable.
8622 * `#[static_assert]` makes compile-time assertions about static bools.
8623 * At long last, 'argument modes' no longer exist.
8624 * The rarely used `use mod` statement no longer exists.
8627 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8629 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8630 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8632 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8633 and unsuffixed integer literals.
8636 * The `core` crate was renamed to `std`.
8637 * The `std` crate was renamed to `extra`.
8638 * More and improved documentation.
8639 * std: `iterator` module for external iterator objects.
8640 * Many old-style (internal, higher-order function) iterators replaced by
8641 implementations of `Iterator`.
8642 * std: Many old internal vector and string iterators,
8643 incl. `any`, `all`. removed.
8644 * std: The `finalize` method of `Drop` renamed to `drop`.
8645 * std: The `drop` method now takes `&mut self` instead of `&self`.
8646 * std: The prelude no longer re-exports any modules, only types and traits.
8647 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8648 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8649 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8650 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8651 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8652 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8653 * std: Many types implement `Clone`.
8654 * std: `path` type renamed to `Path`.
8655 * std: `mut` module and `Mut` type removed.
8656 * std: Many standalone functions removed in favor of methods and iterators
8657 in `vec`, `str`. In the future methods will also work as functions.
8658 * std: `reinterpret_cast` removed. Use `transmute`.
8659 * std: ascii string handling in `std::ascii`.
8660 * std: `Rand` is implemented for ~/@.
8661 * std: `run` module for spawning processes overhauled.
8662 * std: Various atomic types added to `unstable::atomic`.
8663 * std: Various types implement `Zero`.
8664 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8665 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8666 * std: Added `os::mkdir_recursive`.
8667 * std: Added `os::glob` function performs filesystems globs.
8668 * std: `FuzzyEq` renamed to `ApproxEq`.
8669 * std: `Map` now defines `pop` and `swap` methods.
8670 * std: `Cell` constructors converted to static methods.
8671 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8672 * extra: `flate` module moved from `std` to `extra`.
8673 * extra: `fileinput` module for iterating over a series of files.
8674 * extra: `Complex` number type and `complex` module.
8675 * extra: `Rational` number type and `rational` module.
8676 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8677 * extra: `term` uses terminfo now, is more correct.
8678 * extra: `arc` functions converted to methods.
8679 * extra: Implementation of fixed output size variations of SHA-2.
8682 * `unused_variables` lint mode for unused variables (default: warn).
8683 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8685 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8687 * `dead_assignment` lint mode for unread variables (default: warn).
8688 * `unnecessary_allocation` lint mode detects some heap allocations that are
8689 immediately borrowed so could be written without allocating (default: warn).
8690 * `missing_doc` lint mode (default: allow).
8691 * `unreachable_code` lint mode (default: warn).
8692 * The `rusti` command has been rewritten and a number of bugs addressed.
8693 * rustc outputs in color on more terminals.
8694 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8695 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8696 * Compiling with `-g` will make the binary record information about
8697 dynamic borrowcheck failures for debugging.
8698 * rustdoc has a nicer stylesheet.
8699 * Various improvements to rustdoc.
8700 * Improvements to rustpkg (see the detailed release notes).
8703 Version 0.6 (2013-04-03)
8704 ========================
8706 * ~2100 changes, numerous bugfixes
8709 * The self type parameter in traits is now spelled `Self`
8710 * The `self` parameter in trait and impl methods must now be explicitly
8711 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8712 * Static methods no longer require the `static` keyword and instead
8713 are distinguished by the lack of a `self` parameter
8714 * Replaced the `Durable` trait with the `'static` lifetime
8715 * The old closure type syntax with the trailing sigil has been
8716 removed in favor of the more consistent leading sigil
8717 * `super` is a keyword, and may be prefixed to paths
8718 * Trait bounds are separated with `+` instead of whitespace
8719 * Traits are implemented with `impl Trait for Type`
8720 instead of `impl Type: Trait`
8721 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8722 * The `export` keyword has finally been removed
8723 * The `move` keyword has been removed (see "Semantic changes")
8724 * The interior mutability qualifier on vectors, `[mut T]`, has been
8725 removed. Use `&mut [T]`, etc.
8726 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8727 * `fail` is no longer a keyword. Use `fail!()`
8728 * `assert` is no longer a keyword. Use `assert!()`
8729 * `log` is no longer a keyword. use `debug!`, etc.
8730 * 1-tuples may be represented as `(T,)`
8731 * Struct fields may no longer be `mut`. Use inherited mutability,
8732 `@mut T`, `core::mut` or `core::cell`
8733 * `extern mod { ... }` is no longer valid syntax for foreign
8734 function modules. Use extern blocks: `extern { ... }`
8735 * Newtype enums removed. Use tuple-structs.
8736 * Trait implementations no longer support visibility modifiers
8737 * Pattern matching over vectors improved and expanded
8738 * `const` renamed to `static` to correspond to lifetime name,
8739 and make room for future `static mut` unsafe mutable globals.
8740 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8741 * `Clone` implementations can be automatically generated with
8742 `#[deriving(Clone)]`
8743 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8744 instead of `foo as Bar`.
8745 * Fixed length vector types are now written as `[int, .. 3]`
8746 instead of `[int * 3]`.
8747 * Fixed length vector types can express the length as a constant
8748 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8751 * Types with owned pointers or custom destructors move by default,
8752 eliminating the `move` keyword
8753 * All foreign functions are considered unsafe
8754 * &mut is now unaliasable
8755 * Writes to borrowed @mut pointers are prevented dynamically
8757 * The name of the main function can be customized using #[main]
8758 * The default type of an inferred closure is &fn instead of @fn
8759 * `use` statements may no longer be "chained" - they cannot import
8760 identifiers imported by previous `use` statements
8761 * `use` statements are crate relative, importing from the "top"
8762 of the crate by default. Paths may be prefixed with `super::`
8763 or `self::` to change the search behavior.
8764 * Method visibility is inherited from the implementation declaration
8765 * Structural records have been removed
8766 * Many more types can be used in static items, including enums
8767 'static-lifetime pointers and vectors
8768 * Pattern matching over vectors improved and expanded
8769 * Typechecking of closure types has been overhauled to
8770 improve inference and eliminate unsoundness
8771 * Macros leave scope at the end of modules, unless that module is
8772 tagged with #[macro_escape]
8775 * Added big integers to `std::bigint`
8776 * Removed `core::oldcomm` module
8777 * Added pipe-based `core::comm` module
8778 * Numeric traits have been reorganized under `core::num`
8779 * `vec::slice` finally returns a slice
8780 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8781 * Containers reorganized around traits in `core::container`
8782 * `core::dvec` removed, `~[T]` is a drop-in replacement
8783 * `core::send_map` renamed to `core::hashmap`
8784 * `std::map` removed; replaced with `core::hashmap`
8785 * `std::treemap` reimplemented as an owned balanced tree
8786 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8787 * `core::trie` added as a fast ordered map for integer keys
8788 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8789 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8790 overload the comparison operators, whereas `TotalOrd` is used
8791 by certain container types
8794 * Replaced the 'cargo' package manager with 'rustpkg'
8795 * Added all-purpose 'rust' tool
8796 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8797 * rustc now *attempts* to offer spelling suggestions
8798 * Improved support for ARM and Android
8799 * Preliminary MIPS backend
8800 * Improved foreign function ABI implementation for x86, x86_64
8801 * Various memory usage improvements
8802 * Rust code may be embedded in foreign code under limited circumstances
8803 * Inline assembler supported by new asm!() syntax extension.
8806 Version 0.5 (2012-12-21)
8807 ===========================
8809 * ~900 changes, numerous bugfixes
8812 * Removed `<-` move operator
8813 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8814 * Removed old fixed length vector syntax - `[T]/N`
8815 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8816 * Macros may now expand to items and statements
8817 * `a.b()` is always parsed as a method call, never as a field projection
8818 * `Eq` and `IterBytes` implementations can be automatically generated
8819 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8820 * Removed the special crate language for `.rc` files
8821 * Function arguments may consist of any irrefutable pattern
8824 * `&` and `~` pointers may point to objects
8825 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8826 * Enum variants may be structs
8827 * Destructors can be added to all nominal types with the Drop trait
8828 * Structs and nullary enum variants may be constants
8829 * Values that cannot be implicitly copied are now automatically moved
8830 without writing `move` explicitly
8831 * `&T` may now be coerced to `*T`
8832 * Coercions happen in `let` statements as well as function calls
8833 * `use` statements now take crate-relative paths
8834 * The module and type namespaces have been merged so that static
8835 method names can be resolved under the trait in which they are
8838 * Improved support for language features
8839 * Trait inheritance works in many scenarios
8840 * More support for explicit self arguments in methods - `self`, `&self`
8841 `@self`, and `~self` all generally work as expected
8842 * Static methods work in more situations
8843 * Experimental: Traits may declare default methods for the implementations
8847 * New condition handling system in `core::condition`
8848 * Timsort added to `std::sort`
8849 * New priority queue, `std::priority_queue`
8850 * Pipes for serializable types, `std::flatpipes'
8851 * Serialization overhauled to be trait-based
8852 * Expanded `getopts` definitions
8853 * Moved futures to `std`
8854 * More functions are pure now
8855 * `core::comm` renamed to `oldcomm`. Still deprecated
8856 * `rustdoc` and `cargo` are libraries now
8859 * Added a preliminary REPL, `rusti`
8860 * License changed from MIT to dual MIT/APL2
8863 Version 0.4 (2012-10-15)
8864 ==========================
8866 * ~2000 changes, numerous bugfixes
8869 * All keywords are now strict and may not be used as identifiers anywhere
8870 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8871 'of', 'with', 'to', 'class'.
8872 * Classes are replaced with simpler structs
8873 * Explicit method self types
8874 * `ret` became `return` and `alt` became `match`
8875 * `import` is now `use`; `use is now `extern mod`
8876 * `extern mod { ... }` is now `extern { ... }`
8877 * `use mod` is the recommended way to import modules
8878 * `pub` and `priv` replace deprecated export lists
8879 * The syntax of `match` pattern arms now uses fat arrow (=>)
8880 * `main` no longer accepts an args vector; use `os::args` instead
8883 * Trait implementations are now coherent, ala Haskell typeclasses
8884 * Trait methods may be static
8885 * Argument modes are deprecated
8886 * Borrowed pointers are much more mature and recommended for use
8887 * Strings and vectors in the static region are stored in constant memory
8888 * Typestate was removed
8889 * Resolution rewritten to be more reliable
8890 * Support for 'dual-mode' data structures (freezing and thawing)
8893 * Most binary operators can now be overloaded via the traits in
8895 * `std::net::url` for representing URLs
8896 * Sendable hash maps in `core::send_map`
8897 * `core::task' gained a (currently unsafe) task-local storage API
8900 * An efficient new intertask communication primitive called the pipe,
8901 along with a number of higher-level channel types, in `core::pipes`
8902 * `std::arc`, an atomically reference counted, immutable, shared memory
8904 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8905 * Futures are now based on pipes and sendable
8906 * More robust linked task failure
8907 * Improved task builder API
8910 * Improved error reporting
8911 * Preliminary JIT support
8912 * Preliminary work on precise GC
8913 * Extensive architectural improvements to rustc
8914 * Begun a transition away from buggy C++-based reflection (shape) code to
8915 Rust-based (visitor) code
8916 * All hash functions and tables converted to secure, randomized SipHash
8919 Version 0.3 (2012-07-12)
8920 ========================
8922 * ~1900 changes, numerous bugfixes
8924 * New coding conveniences
8925 * Integer-literal suffix inference
8926 * Per-item control over warnings, errors
8927 * #[cfg(windows)] and #[cfg(unix)] attributes
8928 * Documentation comments
8929 * More compact closure syntax
8930 * 'do' expressions for treating higher-order functions as
8932 * *-patterns (wildcard extended to all constructor fields)
8935 * Name resolution pass and exhaustiveness checker rewritten
8936 * Region pointers and borrow checking supersede alias
8938 * Init-ness checking is now provided by a region-based liveness
8939 pass instead of the typestate pass; same for last-use analysis
8940 * Extensive work on region pointers
8942 * Experimental new language features
8943 * Slices and fixed-size, interior-allocated vectors
8944 * #!-comments for lang versioning, shell execution
8945 * Destructors and iface implementation for classes;
8946 type-parameterized classes and class methods
8947 * 'const' type kind for types that can be used to implement
8948 shared-memory concurrency patterns
8952 * Removal of various obsolete features
8953 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8954 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8956 * Constructs: do-while loops ('do' repurposed), fn binding,
8957 resources (replaced by destructors)
8959 * Compiler reorganization
8960 * Syntax-layer of compiler split into separate crate
8961 * Clang (from LLVM project) integrated into build
8962 * Typechecker split into sub-modules
8965 * New time functions
8966 * Extension methods for many built-in types
8967 * Arc: atomic-refcount read-only / exclusive-use shared cells
8968 * Par: parallel map and search routines
8969 * Extensive work on libuv interface
8970 * Much vector code moved to libraries
8971 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8972 #include, #include_str, #include_bin
8975 * Cargo automatically resolves dependencies
8978 Version 0.2 (2012-03-29)
8979 =========================
8981 * >1500 changes, numerous bugfixes
8983 * New docs and doc tooling
8985 * New port: FreeBSD x86_64
8987 * Compilation model enhancements
8988 * Generics now specialized, multiply instantiated
8989 * Functions now inlined across separate crates
8991 * Scheduling, stack and threading fixes
8992 * Noticeably improved message-passing performance
8993 * Explicit schedulers
8997 * Experimental new language features
8998 * Operator overloading
9002 * Various language extensions
9003 * C-callback function types: 'crust fn ...'
9004 * Infinite-loop construct: 'loop { ... }'
9005 * Shorten 'mutable' to 'mut'
9006 * Required mutable-local qualifier: 'let mut ...'
9007 * Basic glob-exporting: 'export foo::*;'
9008 * Alt now exhaustive, 'alt check' for runtime-checked
9009 * Block-function form of 'for' loop, with 'break' and 'ret'.
9012 * AST quasi-quote syntax extension
9013 * Revived libuv interface
9014 * New modules: core::{future, iter}, std::arena
9015 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9016 * Extensive cleanup, regularization in libstd, libcore
9019 Version 0.1 (2012-01-20)
9020 ===============================
9022 * Most language features work, including:
9023 * Unique pointers, unique closures, move semantics
9024 * Interface-constrained generics
9025 * Static interface dispatch
9027 * Multithread task scheduling
9028 * Typestate predicates
9029 * Failure unwinding, destructors
9030 * Pattern matching and destructuring assignment
9031 * Lightweight block-lambda syntax
9032 * Preliminary macro-by-example
9034 * Compiler works with the following configurations:
9035 * Linux: x86 and x86_64 hosts and targets
9036 * macOS: x86 and x86_64 hosts and targets
9037 * Windows: x86 hosts and targets
9039 * Cross compilation / multi-target configuration supported.
9041 * Preliminary API-documentation and package-management tools included.
9045 * Documentation is incomplete.
9047 * Performance is below intended target.
9049 * Standard library APIs are subject to extensive change, reorganization.
9051 * Language-level versioning is not yet operational - future code will