1 Version 1.44.0 (2020-06-04)
2 ==========================
6 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
7 - [Added the `unused_braces` lint.][70081]
9 **Syntax-only changes**
11 - [Expansion-driven outline module parsing][69838]
16 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
21 These are still rejected semantically, so you will likely receive an error but
22 these changes can be seen and parsed by macros and conditional compilation.
26 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
27 Additionally when in incremental mode rustc defaults to 256 codegen units.
28 - [Refactored `catch_unwind`, to have zero-cost unless unwinding is enabled and
29 a panic is thrown.][67502]
30 - [Added tier 3\* support for the `aarch64-unknown-none` and
31 `aarch64-unknown-none-softfloat` targets.][68334]
32 - [Added tier 3 support for `arm64-apple-tvos` and
33 `x86_64-apple-tvos` targets.][68191]
38 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
39 `vec![]` to be able to be used in `const` contexts.
40 - [`convert::Infallible` now implements `Hash`.][70281]
41 - [`OsString` now implements `DerefMut` and `IndexMut` returning
42 a `&mut OsStr`.][70048]
43 - [Unicode 13 is now supported.][69929]
44 - [`String` now implements `From<&mut str>`.][69661]
45 - [`IoSlice` now implements `Copy`.][69403]
46 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is less than 32.
47 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
48 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
49 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
50 integer types.][69373]
54 - [`PathBuf::with_capacity`]
55 - [`PathBuf::capacity`]
57 - [`PathBuf::reserve`]
58 - [`PathBuf::reserve_exact`]
59 - [`PathBuf::shrink_to_fit`]
60 - [`f32::to_int_unchecked`]
61 - [`f64::to_int_unchecked`]
62 - [`Layout::align_to`]
63 - [`Layout::pad_to_align`]
69 - [Added the `cargo tree` command which will print a tree graph of
70 your dependencies.][cargo/8062] E.g.
72 mdbook v0.3.2 (/Users/src/rust/mdbook)
74 │ ├── html5ever v0.24.0
76 │ │ │ └── cfg-if v0.1.9
78 │ │ └── markup5ever v0.9.0
79 │ │ ├── log v0.4.8 (*)
81 │ │ │ └── phf_shared v0.7.24
82 │ │ │ ├── siphasher v0.2.3
83 │ │ │ └── unicase v1.4.2
84 │ │ │ [build-dependencies]
85 │ │ │ └── version_check v0.1.5
91 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
92 the version in the sidebar.][69494]
96 - [Rustc now correctly generates static libraries on Windows GNU targets with
97 the `.a` extension, rather than the previous `.lib`.][70937]
98 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
99 - [The `file_name` property in JSON output of macro errors now points the actual
100 source file rather than the previous format of `<NAME macros>`.][70969]
101 **Note:** this may not point a file that actually exists on the user's system.
102 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
103 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
104 not allow zero initialization such as `NonZeroU8`.][66059] This was
105 previously a warning.
106 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
107 operator has been defined as a saturating operation.][71269] This was previously
108 undefined behaviour, you can use the `{f64, f32}::to_int_unchecked` methods to
109 continue using the current behaviour which may desirable in rare performance
110 sensitive situations.
114 These changes provide no direct user facing benefits, but represent significant
115 improvements to the internals and overall performance of rustc and
118 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
119 - [Replace big JS dict with JSON parsing.][71250]
121 [69373]: https://github.com/rust-lang/rust/pull/69373/
122 [66059]: https://github.com/rust-lang/rust/pull/66059/
123 [68191]: https://github.com/rust-lang/rust/pull/68191/
124 [68899]: https://github.com/rust-lang/rust/pull/68899/
125 [71147]: https://github.com/rust-lang/rust/pull/71147/
126 [71250]: https://github.com/rust-lang/rust/pull/71250/
127 [70937]: https://github.com/rust-lang/rust/pull/70937/
128 [70969]: https://github.com/rust-lang/rust/pull/70969/
129 [70632]: https://github.com/rust-lang/rust/pull/70632/
130 [70281]: https://github.com/rust-lang/rust/pull/70281/
131 [70345]: https://github.com/rust-lang/rust/pull/70345/
132 [70048]: https://github.com/rust-lang/rust/pull/70048/
133 [70081]: https://github.com/rust-lang/rust/pull/70081/
134 [70156]: https://github.com/rust-lang/rust/pull/70156/
135 [71269]: https://github.com/rust-lang/rust/pull/71269/
136 [69838]: https://github.com/rust-lang/rust/pull/69838/
137 [69929]: https://github.com/rust-lang/rust/pull/69929/
138 [69661]: https://github.com/rust-lang/rust/pull/69661/
139 [69778]: https://github.com/rust-lang/rust/pull/69778/
140 [69494]: https://github.com/rust-lang/rust/pull/69494/
141 [69403]: https://github.com/rust-lang/rust/pull/69403/
142 [69033]: https://github.com/rust-lang/rust/pull/69033/
143 [68692]: https://github.com/rust-lang/rust/pull/68692/
144 [68334]: https://github.com/rust-lang/rust/pull/68334/
145 [67502]: https://github.com/rust-lang/rust/pull/67502/
146 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
147 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
148 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
149 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
150 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
151 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
152 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
153 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
154 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
155 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
156 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
157 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
158 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
161 Version 1.43.1 (2020-05-07)
162 ===========================
164 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
165 * [Fixed the stabilization of AVX-512 features.][71473]
166 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
168 [71430]: https://github.com/rust-lang/rust/pull/71430
169 [71473]: https://github.com/rust-lang/rust/issues/71473
170 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
173 Version 1.43.0 (2020-04-23)
174 ==========================
178 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
179 the type inferred correctly.][68129]
180 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
182 **Syntax only changes**
183 - [Allow `type Foo: Ord` syntactically.][69361]
184 - [Fuse associated and extern items up to defaultness.][69194]
185 - [Syntactically allow `self` in all `fn` contexts.][68764]
186 - [Merge `fn` syntax + cleanup item parsing.][68728]
187 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
188 For example, you may now write:
190 macro_rules! mac_trait {
200 These are still rejected *semantically*, so you will likely receive an error but
201 these changes can be seen and parsed by macros and
202 conditional compilation.
207 - [You can now pass multiple lint flags to rustc to override the previous
208 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
209 everything in the `unused` lint group except `unused-variables` which
210 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
211 everything in the `unused` lint group **including** `unused-variables` since
212 the allow flag is specified before the deny flag (and therefore overridden).
213 - [rustc will now prefer your system MinGW libraries over its bundled libraries
214 if they are available on `windows-gnu`.][67429]
215 - [rustc now buffers errors/warnings printed in JSON.][69227]
219 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
220 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
221 respectively.][69538] **Note** These conversions are only available when `N`
223 - [You can now use associated constants on floats and integers directly, rather
224 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
225 `f32::NAN` with no imports.
226 - [`u8::is_ascii` is now `const`.][68984]
227 - [`String` now implements `AsMut<str>`.][68742]
228 - [Added the `primitive` module to `std` and `core`.][67637] This module
229 reexports Rust's primitive types. This is mainly useful in macros
230 where you want avoid these types being shadowed.
231 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
232 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
236 - [`Once::is_completed`]
241 - [`iter::once_with`]
245 - [You can now set config `[profile]`s in your `.cargo/config`, or through
246 your environment.][cargo/7823]
247 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
248 executable path when running integration tests or benchmarks.][cargo/7697]
249 `<name>` is the name of your binary as-is e.g. If you wanted the executable
250 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
254 - [Certain checks in the `const_err` lint were deemed unrelated to const
255 evaluation][69185], and have been moved to the `unconditional_panic` and
256 `arithmetic_overflow` lints.
261 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
262 has been a warning since 1.36.0.
263 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
264 led to some instances being accepted, and now correctly emits a hard error.
266 [69340]: https://github.com/rust-lang/rust/pull/69340
270 These changes provide no direct user facing benefits, but represent significant
271 improvements to the internals and overall performance of `rustc` and
274 - [All components are now built with `opt-level=3` instead of `2`.][67878]
275 - [Improved how rustc generates drop code.][67332]
276 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
277 - [traits: preallocate 2 Vecs of known initial size][69022]
278 - [Avoid exponential behaviour when relating types][68772]
279 - [Skip `Drop` terminators for enum variants without drop glue][68943]
280 - [Improve performance of coherence checks][68966]
281 - [Deduplicate types in the generator witness][68672]
282 - [Invert control in struct_lint_level.][68725]
284 [67332]: https://github.com/rust-lang/rust/pull/67332/
285 [67429]: https://github.com/rust-lang/rust/pull/67429/
286 [67637]: https://github.com/rust-lang/rust/pull/67637/
287 [67642]: https://github.com/rust-lang/rust/pull/67642/
288 [67878]: https://github.com/rust-lang/rust/pull/67878/
289 [67885]: https://github.com/rust-lang/rust/pull/67885/
290 [68129]: https://github.com/rust-lang/rust/pull/68129/
291 [68672]: https://github.com/rust-lang/rust/pull/68672/
292 [68725]: https://github.com/rust-lang/rust/pull/68725/
293 [68728]: https://github.com/rust-lang/rust/pull/68728/
294 [68738]: https://github.com/rust-lang/rust/pull/68738/
295 [68742]: https://github.com/rust-lang/rust/pull/68742/
296 [68764]: https://github.com/rust-lang/rust/pull/68764/
297 [68772]: https://github.com/rust-lang/rust/pull/68772/
298 [68943]: https://github.com/rust-lang/rust/pull/68943/
299 [68952]: https://github.com/rust-lang/rust/pull/68952/
300 [68966]: https://github.com/rust-lang/rust/pull/68966/
301 [68984]: https://github.com/rust-lang/rust/pull/68984/
302 [69022]: https://github.com/rust-lang/rust/pull/69022/
303 [69185]: https://github.com/rust-lang/rust/pull/69185/
304 [69194]: https://github.com/rust-lang/rust/pull/69194/
305 [69201]: https://github.com/rust-lang/rust/pull/69201/
306 [69227]: https://github.com/rust-lang/rust/pull/69227/
307 [69548]: https://github.com/rust-lang/rust/pull/69548/
308 [69256]: https://github.com/rust-lang/rust/pull/69256/
309 [69361]: https://github.com/rust-lang/rust/pull/69361/
310 [69366]: https://github.com/rust-lang/rust/pull/69366/
311 [69538]: https://github.com/rust-lang/rust/pull/69538/
312 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
313 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
314 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
315 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
316 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
317 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
318 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
319 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
322 Version 1.42.0 (2020-03-12)
323 ==========================
327 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
329 fn foo(words: &[&str]) {
331 ["Hello", "World", "!", ..] => println!("Hello World!"),
332 ["Foo", "Bar", ..] => println!("Baz"),
333 rest => println!("{:?}", rest),
337 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
338 that you can create an enum that has the exact layout and ABI of the type
340 - [There are some *syntax-only* changes:][67131]
341 - `default` is syntactically allowed before items in `trait` definitions.
342 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
343 leave out their bodies in favor of `;`.
344 - Bounds on associated types in `impl`s are now syntactically allowed
345 (e.g. `type Foo: Ord;`).
346 - `...` (the C-variadic type) may occur syntactically directly as the type of
347 any function parameter.
349 These are still rejected *semantically*, so you will likely receive an error
350 but these changes can be seen and parsed by procedural macros and
351 conditional compilation.
355 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
356 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
357 - [`Option::{expect,unwrap}` and
358 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
359 pointing to the location where they were called, rather than
360 `core`'s internals. ][67887]
362 \* Refer to Rust's [platform support page][forge-platform-support] for more
363 information on Rust's tiered platform support.
367 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
368 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
369 to implement `Sized`.][67935]
370 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
371 - [`Layout::new` is now `const`.][66254]
372 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
377 - [`CondVar::wait_while`]
378 - [`CondVar::wait_timeout_while`]
380 - [`DebugMap::value`]
381 - [`ManuallyDrop::take`]
383 - [`ptr::slice_from_raw_parts_mut`]
384 - [`ptr::slice_from_raw_parts`]
388 - [You no longer need to include `extern crate proc_macro;` to be able to
389 `use proc_macro;` in the `2018` edition.][cargo/7700]
393 - [`Error::description` has been deprecated, and its use will now produce a
394 warning.][66919] It's recommended to use `Display`/`to_string` instead.
396 [68253]: https://github.com/rust-lang/rust/pull/68253/
397 [68348]: https://github.com/rust-lang/rust/pull/68348/
398 [67935]: https://github.com/rust-lang/rust/pull/67935/
399 [68339]: https://github.com/rust-lang/rust/pull/68339/
400 [68122]: https://github.com/rust-lang/rust/pull/68122/
401 [67712]: https://github.com/rust-lang/rust/pull/67712/
402 [67887]: https://github.com/rust-lang/rust/pull/67887/
403 [67131]: https://github.com/rust-lang/rust/pull/67131/
404 [67233]: https://github.com/rust-lang/rust/pull/67233/
405 [66899]: https://github.com/rust-lang/rust/pull/66899/
406 [66919]: https://github.com/rust-lang/rust/pull/66919/
407 [66254]: https://github.com/rust-lang/rust/pull/66254/
408 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
409 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
410 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
411 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
412 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
413 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
414 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
415 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
416 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
419 Version 1.41.1 (2020-02-27)
420 ===========================
422 * [Always check types of static items][69145]
423 * [Always check lifetime bounds of `Copy` impls][69145]
424 * [Fix miscompilation in callers of `Layout::repeat`][69225]
426 [69225]: https://github.com/rust-lang/rust/issues/69225
427 [69145]: https://github.com/rust-lang/rust/pull/69145
430 Version 1.41.0 (2020-01-30)
431 ===========================
436 - [You can now pass type parameters to foreign items when implementing
437 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
438 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
439 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
440 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
441 - [You can now use any valid identifier in a `format_args` macro.][66847]
442 Previously identifiers starting with an underscore were not allowed.
443 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
444 enum variants.][66183] These are still rejected semantically, but
445 can be seen and parsed by procedural macros and conditional compilation.
450 - [Rustc will now warn if you have unused loop `'label`s.][66325]
451 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
452 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
453 - [You can now pass an arguments file passing the `@path` syntax
454 to rustc.][66172] Note that the format differs somewhat from what is
455 found in other tooling; please see [the documentation][argfile-docs] for
457 - [You can now provide `--extern` flag without a path, indicating that it is
458 available from the search path or specified with an `-L` flag.][64882]
460 \* Refer to Rust's [platform support page][forge-platform-support] for more
461 information on Rust's tiered platform support.
463 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
468 - [The `core::panic` module is now stable.][66771] It was already stable
470 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
471 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
472 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
478 - [`Result::map_or_else`]
479 - [`std::rc::Weak::weak_count`]
480 - [`std::rc::Weak::strong_count`]
481 - [`std::sync::Weak::weak_count`]
482 - [`std::sync::Weak::strong_count`]
487 - [Cargo will now document all the private items for binary crates
488 by default.][cargo/7593]
489 - [`cargo-install` will now reinstall the package if it detects that it is out
490 of date.][cargo/7560]
491 - [Cargo.lock now uses a more git friendly format that should help to reduce
492 merge conflicts.][cargo/7579]
493 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
494 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
495 optimisation level to `2` for debug builds. You can also use
496 `[profile.<profile>.build-override]` to override build scripts and
502 - [You can now specify `edition` in documentation code blocks to compile the block
503 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
504 should be compiled the 2018 edition of Rust.
505 - [You can now provide custom themes to rustdoc with `--theme`, and check the
506 current theme with `--check-theme`.][54733]
507 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
512 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
513 Apple targets.][apple-32bit-drop] This means that the source code is still
514 available to build, but the targets are no longer being tested and release
515 binaries for those platforms will no longer be distributed by the Rust project.
516 Please refer to the linked blog post for more information.
518 [54733]: https://github.com/rust-lang/rust/pull/54733/
519 [61351]: https://github.com/rust-lang/rust/pull/61351/
520 [67255]: https://github.com/rust-lang/rust/pull/67255/
521 [66661]: https://github.com/rust-lang/rust/pull/66661/
522 [66771]: https://github.com/rust-lang/rust/pull/66771/
523 [66847]: https://github.com/rust-lang/rust/pull/66847/
524 [66238]: https://github.com/rust-lang/rust/pull/66238/
525 [66277]: https://github.com/rust-lang/rust/pull/66277/
526 [66325]: https://github.com/rust-lang/rust/pull/66325/
527 [66172]: https://github.com/rust-lang/rust/pull/66172/
528 [66183]: https://github.com/rust-lang/rust/pull/66183/
529 [65879]: https://github.com/rust-lang/rust/pull/65879/
530 [65013]: https://github.com/rust-lang/rust/pull/65013/
531 [64882]: https://github.com/rust-lang/rust/pull/64882/
532 [64325]: https://github.com/rust-lang/rust/pull/64325/
533 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
534 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
535 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
536 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
537 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
538 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
539 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
540 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
541 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
542 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
543 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
545 Version 1.40.0 (2019-12-19)
546 ===========================
550 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
551 `const` contexts.][65188] e.g.
554 pub struct Point(i32, i32);
556 const ORIGIN: Point = {
557 let constructor = Point;
563 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
564 indicate that there may be variants or fields added in the future.][64639]
565 For example this requires adding a wild-card branch (`_ => {}`) to any match
566 statements on a non-exhaustive `enum`. [(RFC 2008)]
567 - [You can now use function-like procedural macros in `extern` blocks and in
568 type positions.][63931] e.g. `type Generated = macro!();`
569 - [Function-like and attribute procedural macros can now emit
570 `macro_rules!` items, so you can now have your macros generate macros.][64035]
571 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
572 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
573 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
577 - [Added tier 3 support\* for the
578 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
579 - [Added tier 3 support for the
580 `aarch64-unknown-none-softfloat` target.][64589]
581 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
582 `mips64el-unknown-linux-muslabi64` targets.][65843]
584 \* Refer to Rust's [platform support page][forge-platform-support] for more
585 information on Rust's tiered platform support.
589 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
593 - [`BTreeMap::get_key_value`]
594 - [`HashMap::get_key_value`]
595 - [`Option::as_deref_mut`]
596 - [`Option::as_deref`]
597 - [`Option::flatten`]
598 - [`UdpSocket::peer_addr`]
599 - [`f32::to_be_bytes`]
600 - [`f32::to_le_bytes`]
601 - [`f32::to_ne_bytes`]
602 - [`f64::to_be_bytes`]
603 - [`f64::to_le_bytes`]
604 - [`f64::to_ne_bytes`]
605 - [`f32::from_be_bytes`]
606 - [`f32::from_le_bytes`]
607 - [`f32::from_ne_bytes`]
608 - [`f64::from_be_bytes`]
609 - [`f64::from_le_bytes`]
610 - [`f64::from_ne_bytes`]
617 - [Cargo will now always display warnings, rather than only on
618 fresh builds.][cargo/7450]
619 - [Feature flags (except `--all-features`) passed to a virtual workspace will
620 now produce an error.][cargo/7507] Previously these flags were ignored.
621 - [You can now publish `dev-dependencies` without including
622 a `version`.][cargo/7333]
626 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
627 when running documentation tests with `rustdoc`.][63803]
631 - [As previously announced, any previous NLL warnings in the 2015 edition are
632 now hard errors.][64221]
633 - [The `include!` macro will now warn if it failed to include the
634 entire file.][64284] The `include!` macro unintentionally only includes the
635 first _expression_ in a file, and this can be unintuitive. This will become
636 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
637 - [Using `#[inline]` on function prototypes and consts now emits a warning under
638 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
639 or `extern` blocks now correctly emits a hard error.
641 [65294]: https://github.com/rust-lang/rust/pull/65294/
642 [66103]: https://github.com/rust-lang/rust/pull/66103/
643 [65843]: https://github.com/rust-lang/rust/pull/65843/
644 [65188]: https://github.com/rust-lang/rust/pull/65188/
645 [65092]: https://github.com/rust-lang/rust/pull/65092/
646 [64589]: https://github.com/rust-lang/rust/pull/64589/
647 [64639]: https://github.com/rust-lang/rust/pull/64639/
648 [64221]: https://github.com/rust-lang/rust/pull/64221/
649 [64284]: https://github.com/rust-lang/rust/pull/64284/
650 [63931]: https://github.com/rust-lang/rust/pull/63931/
651 [64035]: https://github.com/rust-lang/rust/pull/64035/
652 [63674]: https://github.com/rust-lang/rust/pull/63674/
653 [63803]: https://github.com/rust-lang/rust/pull/63803/
654 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
655 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
656 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
657 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
658 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
659 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
660 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
661 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
662 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
663 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
664 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
665 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
666 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
667 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
668 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
669 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
670 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
671 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
672 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
673 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
674 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
675 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
676 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
677 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
678 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
679 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
682 Version 1.39.0 (2019-11-07)
683 ===========================
687 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
688 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
689 - [You can now use certain attributes on function, closure, and function pointer
690 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
691 `deny`, `forbid` as well as inert helper attributes used by procedural macro
692 attributes applied to items. e.g.
695 #[cfg(windows)] slice: &[u16],
696 #[cfg(not(windows))] slice: &[u8],
701 - [You can now take shared references to bind-by-move patterns in the `if` guards
702 of `match` arms.][63118] e.g.
705 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
709 // ---- `nums` is bound by move.
710 if nums.iter().sum::<u8>() == 10
711 // ^------ `.iter()` implicitly takes a reference to `nums`.
714 // ----------- Legal as `nums` was bound by move and so we have ownership.
725 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
726 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
727 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
728 **Note** Cargo currently doesn't use this feature. Refer to
729 [cargo#7315][cargo/7315] to track this feature's progress.
730 - [You can now pass `--show-output` argument to test binaries to print the
731 output of successful tests.][62600]
734 \* Refer to Rust's [platform support page][forge-platform-support] for more
735 information on Rust's tiered platform support.
739 - [`Vec::new` and `String::new` are now `const` functions.][64028]
740 - [`LinkedList::new` is now a `const` function.][63684]
741 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
742 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
747 - [`Pin::into_inner`]
748 - [`Instant::checked_duration_since`]
749 - [`Instant::saturating_duration_since`]
753 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
754 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
755 `--all` is now deprecated.
759 - [You can now pass `-Clinker` to rustdoc to control the linker used
760 for compiling doctests.][63834]
764 - [Code that was previously accepted by the old borrow checker, but rejected by
765 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
766 previously a warning, and will also become a hard error in the Rust 2015
767 edition in the 1.40.0 release.
768 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
769 run tests.][63827] This should improve performance when running a large
771 - [The `try!` macro will now issue a deprecation warning.][62672] It is
772 recommended to use the `?` operator instead.
773 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
776 [62600]: https://github.com/rust-lang/rust/pull/62600/
777 [62672]: https://github.com/rust-lang/rust/pull/62672/
778 [63118]: https://github.com/rust-lang/rust/pull/63118/
779 [63209]: https://github.com/rust-lang/rust/pull/63209/
780 [63402]: https://github.com/rust-lang/rust/pull/63402/
781 [63565]: https://github.com/rust-lang/rust/pull/63565/
782 [63595]: https://github.com/rust-lang/rust/pull/63595/
783 [63684]: https://github.com/rust-lang/rust/pull/63684/
784 [63698]: https://github.com/rust-lang/rust/pull/63698/
785 [63770]: https://github.com/rust-lang/rust/pull/63770/
786 [63786]: https://github.com/rust-lang/rust/pull/63786/
787 [63827]: https://github.com/rust-lang/rust/pull/63827/
788 [63834]: https://github.com/rust-lang/rust/pull/63834/
789 [63927]: https://github.com/rust-lang/rust/pull/63927/
790 [63933]: https://github.com/rust-lang/rust/pull/63933/
791 [63934]: https://github.com/rust-lang/rust/pull/63934/
792 [63938]: https://github.com/rust-lang/rust/pull/63938/
793 [63940]: https://github.com/rust-lang/rust/pull/63940/
794 [63941]: https://github.com/rust-lang/rust/pull/63941/
795 [63945]: https://github.com/rust-lang/rust/pull/63945/
796 [64010]: https://github.com/rust-lang/rust/pull/64010/
797 [64028]: https://github.com/rust-lang/rust/pull/64028/
798 [64334]: https://github.com/rust-lang/rust/pull/64334/
799 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
800 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
801 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
802 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
803 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
804 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
806 Version 1.38.0 (2019-09-26)
807 ==========================
811 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
812 - [The `#[deprecated]` attribute can now be used on macros.][62042]
816 - [Added pipelined compilation support to `rustc`.][62766] This will
817 improve compilation times in some cases. For further information please refer
818 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
819 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
820 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
821 `x86_64-uwp-windows-msvc` targets.][60260]
822 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
823 `armv7-unknown-linux-musleabi` targets.][63107]
824 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
825 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
827 \* Refer to Rust's [platform support page][forge-platform-support] for more
828 information on Rust's tiered platform support.
832 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
833 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
834 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
835 is available at `std::clone::Clone`). This also makes all built-in macros
836 available in `std`/`core` root. e.g. `std::include_bytes!`.
837 - [`str::Chars` now implements `Debug`.][63000]
838 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
839 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
840 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
841 - [Added euclidean remainder and division operations (`div_euclid`,
842 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
843 `overflowing`, and `wrapping` versions are available for all
845 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
847 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
851 - [`<*const T>::cast`]
853 - [`Duration::as_secs_f32`]
854 - [`Duration::as_secs_f64`]
855 - [`Duration::div_f32`]
856 - [`Duration::div_f64`]
857 - [`Duration::from_secs_f32`]
858 - [`Duration::from_secs_f64`]
859 - [`Duration::mul_f32`]
860 - [`Duration::mul_f64`]
865 - [Added pipelined compilation support to `cargo`.][cargo/7143]
866 - [You can now pass the `--features` option multiple times to enable
867 multiple features.][cargo/7084]
871 - [`rustc` will now warn about some incorrect uses of
872 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
876 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
878 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
879 issues][62896] with certain crates such as libc.
881 [60260]: https://github.com/rust-lang/rust/pull/60260/
882 [61457]: https://github.com/rust-lang/rust/pull/61457/
883 [61491]: https://github.com/rust-lang/rust/pull/61491/
884 [61884]: https://github.com/rust-lang/rust/pull/61884/
885 [61953]: https://github.com/rust-lang/rust/pull/61953/
886 [62042]: https://github.com/rust-lang/rust/pull/62042/
887 [62528]: https://github.com/rust-lang/rust/pull/62528/
888 [62583]: https://github.com/rust-lang/rust/pull/62583/
889 [62735]: https://github.com/rust-lang/rust/pull/62735/
890 [62766]: https://github.com/rust-lang/rust/pull/62766/
891 [62784]: https://github.com/rust-lang/rust/pull/62784/
892 [62785]: https://github.com/rust-lang/rust/issues/62785/
893 [62814]: https://github.com/rust-lang/rust/pull/62814/
894 [62896]: https://github.com/rust-lang/rust/issues/62896/
895 [63000]: https://github.com/rust-lang/rust/pull/63000/
896 [63056]: https://github.com/rust-lang/rust/pull/63056/
897 [63107]: https://github.com/rust-lang/rust/pull/63107/
898 [63346]: https://github.com/rust-lang/rust/pull/63346/
899 [63421]: https://github.com/rust-lang/rust/pull/63421/
900 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
901 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
902 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
903 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
904 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
905 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
906 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
907 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
908 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
909 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
910 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
911 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
912 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
913 [forge-platform-support]: https://forge.rust-lang.org/platform-support.html
914 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
916 Version 1.37.0 (2019-08-15)
917 ==========================
921 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
922 [`Box`][62228], or an [array][62235] and unused.
923 - [You can now use the `cfg` and `cfg_attr` attributes on
924 generic parameters.][61547]
925 - [You can now use enum variants through type alias.][61682] e.g. You can
928 type MyOption = Option<u8>;
930 fn increment_or_zero(x: MyOption) -> u8 {
932 MyOption::Some(y) => y + 1,
937 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
939 - [You can now use `#[repr(align(X)]` on enums.][61229]
940 - [The `?` Kleene macro operator is now available in the
941 2015 edition.][60932]
945 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
946 and `-C profile-use` flags.][61268] For more information on how to use profile
947 guided optimization, please refer to the [rustc book][rustc-book-pgo].
948 - [The `rust-lldb` wrapper script should now work again.][61827]
952 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
956 - [`BufReader::buffer`]
957 - [`BufWriter::buffer`]
959 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
960 - [`DoubleEndedIterator::nth_back`]
962 - [`Wrapping::reverse_bits`]
963 - [`i128::reverse_bits`]
964 - [`i16::reverse_bits`]
965 - [`i32::reverse_bits`]
966 - [`i64::reverse_bits`]
967 - [`i8::reverse_bits`]
968 - [`isize::reverse_bits`]
969 - [`slice::copy_within`]
970 - [`u128::reverse_bits`]
971 - [`u16::reverse_bits`]
972 - [`u32::reverse_bits`]
973 - [`u64::reverse_bits`]
974 - [`u8::reverse_bits`]
975 - [`usize::reverse_bits`]
979 - [`Cargo.lock` files are now included by default when publishing executable crates
980 with executables.][cargo/7026]
981 - [You can now specify `default-run="foo"` in `[package]` to specify the
982 default executable to use for `cargo run`.][cargo/7056]
989 - [Using `...` for inclusive range patterns will now warn by default.][61342]
990 Please transition your code to using the `..=` syntax for inclusive
992 - [Using a trait object without the `dyn` will now warn by default.][61203]
993 Please transition your code to use `dyn Trait` for trait objects instead.
995 [62228]: https://github.com/rust-lang/rust/pull/62228/
996 [62235]: https://github.com/rust-lang/rust/pull/62235/
997 [61802]: https://github.com/rust-lang/rust/pull/61802/
998 [61827]: https://github.com/rust-lang/rust/pull/61827/
999 [61547]: https://github.com/rust-lang/rust/pull/61547/
1000 [61682]: https://github.com/rust-lang/rust/pull/61682/
1001 [61268]: https://github.com/rust-lang/rust/pull/61268/
1002 [61342]: https://github.com/rust-lang/rust/pull/61342/
1003 [61347]: https://github.com/rust-lang/rust/pull/61347/
1004 [61100]: https://github.com/rust-lang/rust/pull/61100/
1005 [61203]: https://github.com/rust-lang/rust/pull/61203/
1006 [61229]: https://github.com/rust-lang/rust/pull/61229/
1007 [60932]: https://github.com/rust-lang/rust/pull/60932/
1008 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1009 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1010 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1011 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1012 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1013 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1014 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1015 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1016 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1017 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1018 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1019 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1020 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1021 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1022 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1023 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1024 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1025 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1026 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1027 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1028 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1029 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1030 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1031 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1034 Version 1.36.0 (2019-07-04)
1035 ==========================
1039 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1040 - [The order of traits in trait objects no longer affects the semantics of that
1041 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1042 `dyn fmt::Debug + Send`, where this was previously not the case.
1046 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1047 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1048 - [`mem::needs_drop` is now available as a const fn.][60364]
1049 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1050 - [`String` now implements `BorrowMut<str>`.][60404]
1051 - [`io::Cursor` now implements `Default`.][60234]
1052 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1053 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1054 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1055 environment has access to heap memory allocation.
1056 - [`String` now implements `From<&String>`.][59825]
1057 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1058 return a tuple of each argument when there is multiple arguments.
1059 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1064 - [`VecDeque::rotate_left`]
1065 - [`VecDeque::rotate_right`]
1066 - [`Iterator::copied`]
1068 - [`io::IoSliceMut`]
1069 - [`Read::read_vectored`]
1070 - [`Write::write_vectored`]
1071 - [`str::as_mut_ptr`]
1072 - [`mem::MaybeUninit`]
1073 - [`pointer::align_offset`]
1074 - [`future::Future`]
1076 - [`task::RawWaker`]
1077 - [`task::RawWakerVTable`]
1083 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1084 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1086 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1090 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1097 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1098 longer recommended, and will be deprecated in 1.39.0.
1100 [60318]: https://github.com/rust-lang/rust/pull/60318/
1101 [60364]: https://github.com/rust-lang/rust/pull/60364/
1102 [60370]: https://github.com/rust-lang/rust/pull/60370/
1103 [60404]: https://github.com/rust-lang/rust/pull/60404/
1104 [60234]: https://github.com/rust-lang/rust/pull/60234/
1105 [60244]: https://github.com/rust-lang/rust/pull/60244/
1106 [58623]: https://github.com/rust-lang/rust/pull/58623/
1107 [59648]: https://github.com/rust-lang/rust/pull/59648/
1108 [59675]: https://github.com/rust-lang/rust/pull/59675/
1109 [59825]: https://github.com/rust-lang/rust/pull/59825/
1110 [59826]: https://github.com/rust-lang/rust/pull/59826/
1111 [59445]: https://github.com/rust-lang/rust/pull/59445/
1112 [59114]: https://github.com/rust-lang/rust/pull/59114/
1113 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1114 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1115 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1116 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1117 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1118 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1119 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1120 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1121 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1122 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1123 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1124 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1125 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1126 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1127 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1128 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1129 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1130 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1131 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1132 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1135 Version 1.35.0 (2019-05-23)
1136 ==========================
1140 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1141 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1142 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1144 unsafe fn call_unsafe(func: unsafe fn()) {
1149 unsafe { call_unsafe(|| {}); }
1156 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1157 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1158 - [Added the `wasm32-unknown-wasi` target.][59464]
1163 - [`Thread` will now show its ID in `Debug` output.][59460]
1164 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1165 - [`alloc::System` now implements `Default`.][59451]
1166 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1168 - [`char::{ToLowercase, ToUppercase}` now
1169 implement `ExactSizeIterator`.][58778]
1170 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1171 - [Removed the `Read` trait bounds
1172 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1173 - [You can now call the `dbg!` macro without any parameters to print the file
1174 and line where it is called.][57847]
1175 - [In place ASCII case conversions are now up to 4× faster.][59283]
1176 e.g. `str::make_ascii_lowercase`
1177 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1184 - [`RefCell::replace_with`]
1185 - [`RefCell::map_split`]
1187 - [`Range::contains`]
1188 - [`RangeFrom::contains`]
1189 - [`RangeTo::contains`]
1190 - [`RangeInclusive::contains`]
1191 - [`RangeToInclusive::contains`]
1192 - [`Option::copied`]
1196 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1197 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1202 - [The Rust toolchain is now available natively for musl based distros.][58575]
1204 [59460]: https://github.com/rust-lang/rust/pull/59460/
1205 [59464]: https://github.com/rust-lang/rust/pull/59464/
1206 [59500]: https://github.com/rust-lang/rust/pull/59500/
1207 [59512]: https://github.com/rust-lang/rust/pull/59512/
1208 [59580]: https://github.com/rust-lang/rust/pull/59580/
1209 [59283]: https://github.com/rust-lang/rust/pull/59283/
1210 [59451]: https://github.com/rust-lang/rust/pull/59451/
1211 [59076]: https://github.com/rust-lang/rust/pull/59076/
1212 [58778]: https://github.com/rust-lang/rust/pull/58778/
1213 [58717]: https://github.com/rust-lang/rust/pull/58717/
1214 [58369]: https://github.com/rust-lang/rust/pull/58369/
1215 [58423]: https://github.com/rust-lang/rust/pull/58423/
1216 [58080]: https://github.com/rust-lang/rust/pull/58080/
1217 [57847]: https://github.com/rust-lang/rust/pull/57847/
1218 [58575]: https://github.com/rust-lang/rust/pull/58575
1219 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1220 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1221 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1222 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1223 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1224 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1225 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1226 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1227 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1228 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1229 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1230 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1232 Version 1.34.2 (2019-05-14)
1233 ===========================
1235 * [Destabilize the `Error::type_id` function due to a security
1236 vulnerability][60785] ([CVE-2019-12083])
1238 [60785]: https://github.com/rust-lang/rust/pull/60785
1239 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1241 Version 1.34.1 (2019-04-25)
1242 ===========================
1244 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1245 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1246 * [Fix Clippy panic when checking some macros][clippy/3805]
1248 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1249 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1250 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1252 Version 1.34.0 (2019-04-11)
1253 ==========================
1257 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1258 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1260 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1261 `#[attr{}]` procedural macros.][57367]
1262 - [You can now write `extern crate self as foo;`][57407] to import your
1263 crate's root into the extern prelude.
1268 - [You can now target `riscv64imac-unknown-none-elf` and
1269 `riscv64gc-unknown-none-elf`.][58406]
1270 - [You can now enable linker plugin LTO optimisations with
1271 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1272 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1274 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1279 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1280 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1281 the `Hash` trait to create an iterator.
1282 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1283 methods.][58421] Most notably you no longer require the `Ord` trait to create
1285 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1286 for all numeric types.][58044]
1287 - [Indexing a `str` is now generic over all types that
1288 implement `SliceIndex<str>`.][57604]
1289 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1290 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1291 produce a warning if their returning type is unused.
1292 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1293 `overflowing_pow` are now available for all numeric types.][57873] These are
1294 equivalent to methods such as `wrapping_add` for the `pow` operation.
1302 * [`Error::type_id`]
1303 * [`atomic::AtomicI16`]
1304 * [`atomic::AtomicI32`]
1305 * [`atomic::AtomicI64`]
1306 * [`atomic::AtomicI8`]
1307 * [`atomic::AtomicU16`]
1308 * [`atomic::AtomicU32`]
1309 * [`atomic::AtomicU64`]
1310 * [`atomic::AtomicU8`]
1311 * [`convert::Infallible`]
1312 * [`convert::TryFrom`]
1313 * [`convert::TryInto`]
1315 * [`iter::successors`]
1316 * [`num::NonZeroI128`]
1317 * [`num::NonZeroI16`]
1318 * [`num::NonZeroI32`]
1319 * [`num::NonZeroI64`]
1320 * [`num::NonZeroI8`]
1321 * [`num::NonZeroIsize`]
1322 * [`slice::sort_by_cached_key`]
1323 * [`str::escape_debug`]
1324 * [`str::escape_default`]
1325 * [`str::escape_unicode`]
1326 * [`str::split_ascii_whitespace`]
1329 * [`Instant::checked_add`]
1330 * [`Instant::checked_sub`]
1331 * [`SystemTime::checked_add`]
1332 * [`SystemTime::checked_sub`]
1336 - [You can now use alternative registries to crates.io.][cargo/6654]
1340 - [You can now use the `?` operator in your documentation tests without manually
1341 adding `fn main() -> Result<(), _> {}`.][56470]
1345 - [`Command::before_exec` is being replaced by the unsafe method
1346 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1347 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1348 can now use `const` functions in `static` variables.
1350 [58370]: https://github.com/rust-lang/rust/pull/58370/
1351 [58406]: https://github.com/rust-lang/rust/pull/58406/
1352 [58421]: https://github.com/rust-lang/rust/pull/58421/
1353 [58166]: https://github.com/rust-lang/rust/pull/58166/
1354 [58044]: https://github.com/rust-lang/rust/pull/58044/
1355 [58057]: https://github.com/rust-lang/rust/pull/58057/
1356 [58059]: https://github.com/rust-lang/rust/pull/58059/
1357 [57809]: https://github.com/rust-lang/rust/pull/57809/
1358 [57873]: https://github.com/rust-lang/rust/pull/57873/
1359 [57604]: https://github.com/rust-lang/rust/pull/57604/
1360 [57367]: https://github.com/rust-lang/rust/pull/57367/
1361 [57407]: https://github.com/rust-lang/rust/pull/57407/
1362 [57425]: https://github.com/rust-lang/rust/pull/57425/
1363 [57106]: https://github.com/rust-lang/rust/pull/57106/
1364 [56470]: https://github.com/rust-lang/rust/pull/56470/
1365 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1366 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1367 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1368 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1369 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1370 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1371 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1372 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1373 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1374 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1375 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1376 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1377 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1378 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1379 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1380 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1381 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1382 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1383 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1384 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1385 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1386 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1387 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1388 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1389 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1390 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1391 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1392 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1393 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1394 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1395 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1398 Version 1.33.0 (2019-02-28)
1399 ==========================
1403 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1404 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1405 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1406 E.g. You can have match statement on a `u8` that covers `0..=255` and
1407 you would no longer be required to have a `_ => unreachable!()` case.
1408 - [You can now have multiple patterns in `if let` and `while let`
1409 expressions.][57532] You can do this with the same syntax as a `match`
1419 let state = Creature::Crab("Ferris");
1421 if let Creature::Crab(name) | Creature::Person(name) = state {
1422 println!("This creature's name is: {}", name);
1426 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1427 this feature will by default produce a warning as this behaviour can be
1428 unintuitive. E.g. `if let _ = 5 {}`
1429 - [You can now use `let` bindings, assignments, expression statements,
1430 and irrefutable pattern destructuring in const functions.][57175]
1431 - [You can now call unsafe const functions.][57067] E.g.
1433 const unsafe fn foo() -> i32 { 5 }
1434 const fn bar() -> i32 {
1438 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1439 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1440 - [You can now specify a specific alignment with the `#[repr(packed)]`
1441 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1442 with an alignment of 2 bytes and a size of 6 bytes.
1443 - [You can now import an item from a module as an `_`.][56303] This allows you to
1444 import a trait's impls, and not have the name in the namespace. E.g.
1446 use std::io::Read as _;
1448 // Allowed as there is only one `Read` in the module.
1451 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1455 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1456 command line argument.][56351]
1457 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1458 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1459 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1460 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1461 information on Rust's platform support.
1462 - [Added support for the `thumbv7neon-linux-androideabi` and
1463 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1464 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1468 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1469 functions for all numeric types.][57566]
1470 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1471 are now `const` functions for all numeric types.][57105]
1472 - [The methods `is_positive` and `is_negative` are now `const` functions for
1473 all signed numeric types.][57105]
1474 - [The `get` method for all `NonZero` types is now `const`.][57167]
1475 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1476 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1477 numeric types.][57234]
1478 - [`Ipv4Addr::new` is now a `const` function][57234]
1482 - [`unix::FileExt::read_exact_at`]
1483 - [`unix::FileExt::write_all_at`]
1484 - [`Option::transpose`]
1485 - [`Result::transpose`]
1486 - [`convert::identity`]
1489 - [`marker::PhantomPinned`]
1490 - [`Vec::resize_with`]
1491 - [`VecDeque::resize_with`]
1492 - [`Duration::as_millis`]
1493 - [`Duration::as_micros`]
1494 - [`Duration::as_nanos`]
1499 - [You can now publish crates that require a feature flag to compile with
1500 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1501 - [Cargo should now rebuild a crate if a file was modified during the initial
1506 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1507 are now deprecated in the standard library, and their usage will now produce a warning.
1508 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1510 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1512 - [Libtest no longer creates a new thread for each test when
1513 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1515 [55982]: https://github.com/rust-lang/rust/pull/55982/
1516 [56243]: https://github.com/rust-lang/rust/pull/56243
1517 [56303]: https://github.com/rust-lang/rust/pull/56303/
1518 [56351]: https://github.com/rust-lang/rust/pull/56351/
1519 [56362]: https://github.com/rust-lang/rust/pull/56362
1520 [56642]: https://github.com/rust-lang/rust/pull/56642/
1521 [56769]: https://github.com/rust-lang/rust/pull/56769/
1522 [56805]: https://github.com/rust-lang/rust/pull/56805
1523 [56947]: https://github.com/rust-lang/rust/pull/56947/
1524 [57049]: https://github.com/rust-lang/rust/pull/57049/
1525 [57067]: https://github.com/rust-lang/rust/pull/57067/
1526 [57105]: https://github.com/rust-lang/rust/pull/57105
1527 [57130]: https://github.com/rust-lang/rust/pull/57130/
1528 [57167]: https://github.com/rust-lang/rust/pull/57167/
1529 [57175]: https://github.com/rust-lang/rust/pull/57175/
1530 [57234]: https://github.com/rust-lang/rust/pull/57234/
1531 [57332]: https://github.com/rust-lang/rust/pull/57332/
1532 [57465]: https://github.com/rust-lang/rust/pull/57465/
1533 [57532]: https://github.com/rust-lang/rust/pull/57532/
1534 [57535]: https://github.com/rust-lang/rust/pull/57535/
1535 [57566]: https://github.com/rust-lang/rust/pull/57566/
1536 [57615]: https://github.com/rust-lang/rust/pull/57615/
1537 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1538 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1539 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1540 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1541 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1542 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1543 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1544 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1545 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1546 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1547 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1548 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1549 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1550 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1551 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1552 [platform-support]: https://forge.rust-lang.org/platform-support.html
1554 Version 1.32.0 (2019-01-17)
1555 ==========================
1560 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1561 operator allows you to specify zero or one repetitions similar to the `*` and
1563 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1564 now always resolve to the item (`enum`, `struct`, etc.) available in the
1565 module if present, before resolving to a external crate or an item the prelude.][56759]
1568 enum Color { Red, Green, Blue }
1574 - [You can now match against `PhantomData<T>` types.][55837]
1575 - [You can now match against literals in macros with the `literal`
1576 specifier.][56072] This will match against a literal of any type.
1577 E.g. `1`, `'A'`, `"Hello World"`
1578 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1580 struct Point(i32, i32);
1583 pub fn new(x: i32, y: i32) -> Self {
1587 pub fn is_origin(&self) -> bool {
1595 - [Self can also now be used in type definitions.][56366] E.g.
1599 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1602 Cons(T, Box<Self>) // likewise here
1605 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1606 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1610 - [The default allocator has changed from jemalloc to the default allocator on
1611 your system.][55238] The compiler itself on Linux & macOS will still use
1612 jemalloc, but programs compiled with it will use the system allocator.
1613 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1617 - [`PathBuf` now implements `FromStr`.][55148]
1618 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1619 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1620 easily debug expressions in your rust program. E.g.
1623 let b = dbg!(a * 2) + 1;
1624 // ^-- prints: [src/main.rs:4] a * 2 = 4
1628 The following APIs are now `const` functions and can be used in a
1632 - [`UnsafeCell::get`]
1633 - [`char::is_ascii`]
1635 - [`ManuallyDrop::new`]
1636 - [`ManuallyDrop::into_inner`]
1637 - [`RangeInclusive::start`]
1638 - [`RangeInclusive::end`]
1639 - [`NonNull::as_ptr`]
1642 - [`Duration::as_secs`]
1643 - [`Duration::subsec_millis`]
1644 - [`Duration::subsec_micros`]
1645 - [`Duration::subsec_nanos`]
1647 - [`Ipv4Addr::is_unspecified`]
1649 - [`Ipv6Addr::octets`]
1653 - [`i8::to_be_bytes`]
1654 - [`i8::to_le_bytes`]
1655 - [`i8::to_ne_bytes`]
1656 - [`i8::from_be_bytes`]
1657 - [`i8::from_le_bytes`]
1658 - [`i8::from_ne_bytes`]
1659 - [`i16::to_be_bytes`]
1660 - [`i16::to_le_bytes`]
1661 - [`i16::to_ne_bytes`]
1662 - [`i16::from_be_bytes`]
1663 - [`i16::from_le_bytes`]
1664 - [`i16::from_ne_bytes`]
1665 - [`i32::to_be_bytes`]
1666 - [`i32::to_le_bytes`]
1667 - [`i32::to_ne_bytes`]
1668 - [`i32::from_be_bytes`]
1669 - [`i32::from_le_bytes`]
1670 - [`i32::from_ne_bytes`]
1671 - [`i64::to_be_bytes`]
1672 - [`i64::to_le_bytes`]
1673 - [`i64::to_ne_bytes`]
1674 - [`i64::from_be_bytes`]
1675 - [`i64::from_le_bytes`]
1676 - [`i64::from_ne_bytes`]
1677 - [`i128::to_be_bytes`]
1678 - [`i128::to_le_bytes`]
1679 - [`i128::to_ne_bytes`]
1680 - [`i128::from_be_bytes`]
1681 - [`i128::from_le_bytes`]
1682 - [`i128::from_ne_bytes`]
1683 - [`isize::to_be_bytes`]
1684 - [`isize::to_le_bytes`]
1685 - [`isize::to_ne_bytes`]
1686 - [`isize::from_be_bytes`]
1687 - [`isize::from_le_bytes`]
1688 - [`isize::from_ne_bytes`]
1689 - [`u8::to_be_bytes`]
1690 - [`u8::to_le_bytes`]
1691 - [`u8::to_ne_bytes`]
1692 - [`u8::from_be_bytes`]
1693 - [`u8::from_le_bytes`]
1694 - [`u8::from_ne_bytes`]
1695 - [`u16::to_be_bytes`]
1696 - [`u16::to_le_bytes`]
1697 - [`u16::to_ne_bytes`]
1698 - [`u16::from_be_bytes`]
1699 - [`u16::from_le_bytes`]
1700 - [`u16::from_ne_bytes`]
1701 - [`u32::to_be_bytes`]
1702 - [`u32::to_le_bytes`]
1703 - [`u32::to_ne_bytes`]
1704 - [`u32::from_be_bytes`]
1705 - [`u32::from_le_bytes`]
1706 - [`u32::from_ne_bytes`]
1707 - [`u64::to_be_bytes`]
1708 - [`u64::to_le_bytes`]
1709 - [`u64::to_ne_bytes`]
1710 - [`u64::from_be_bytes`]
1711 - [`u64::from_le_bytes`]
1712 - [`u64::from_ne_bytes`]
1713 - [`u128::to_be_bytes`]
1714 - [`u128::to_le_bytes`]
1715 - [`u128::to_ne_bytes`]
1716 - [`u128::from_be_bytes`]
1717 - [`u128::from_le_bytes`]
1718 - [`u128::from_ne_bytes`]
1719 - [`usize::to_be_bytes`]
1720 - [`usize::to_le_bytes`]
1721 - [`usize::to_ne_bytes`]
1722 - [`usize::from_be_bytes`]
1723 - [`usize::from_le_bytes`]
1724 - [`usize::from_ne_bytes`]
1728 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1729 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1733 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1737 - [The argument types for AVX's
1738 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1739 been changed from `*const` to `*mut` as the previous implementation
1743 [55148]: https://github.com/rust-lang/rust/pull/55148/
1744 [55238]: https://github.com/rust-lang/rust/pull/55238/
1745 [55280]: https://github.com/rust-lang/rust/pull/55280/
1746 [55610]: https://github.com/rust-lang/rust/pull/55610/
1747 [55663]: https://github.com/rust-lang/rust/pull/55663/
1748 [55702]: https://github.com/rust-lang/rust/pull/55702/
1749 [55837]: https://github.com/rust-lang/rust/pull/55837/
1750 [55843]: https://github.com/rust-lang/rust/pull/55843/
1751 [56072]: https://github.com/rust-lang/rust/pull/56072/
1752 [56245]: https://github.com/rust-lang/rust/pull/56245/
1753 [56365]: https://github.com/rust-lang/rust/pull/56365/
1754 [56366]: https://github.com/rust-lang/rust/pull/56366/
1755 [56395]: https://github.com/rust-lang/rust/pull/56395/
1756 [56759]: https://github.com/rust-lang/rust/pull/56759/
1757 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1758 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1759 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1760 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1761 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1762 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1763 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1764 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1765 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1766 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1767 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1768 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1769 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1770 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1771 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1772 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1773 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1774 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1775 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1776 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1777 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1778 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1779 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1780 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1781 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1782 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1783 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1784 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1785 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1786 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1787 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1788 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1789 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1790 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1791 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1792 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1793 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1794 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1795 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1796 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1797 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1798 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1799 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1800 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1801 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1802 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
1803 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
1804 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1805 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1806 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1807 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1808 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1809 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1810 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1811 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
1812 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
1813 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
1814 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
1815 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
1816 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
1817 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
1818 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
1819 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
1820 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
1821 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
1822 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
1823 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
1824 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
1825 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
1826 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
1827 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
1828 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
1829 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
1830 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
1831 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
1832 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
1833 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
1834 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
1835 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
1836 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
1837 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
1838 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
1839 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
1840 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
1841 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
1842 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
1843 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
1844 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
1845 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
1846 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
1847 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
1848 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
1849 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
1852 Version 1.31.1 (2018-12-20)
1853 ===========================
1855 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
1856 - [Fix broken go-to-definition in RLS][rls/1171]
1857 - [Fix infinite loop on hover in RLS][rls/1170]
1859 [56562]: https://github.com/rust-lang/rust/pull/56562
1860 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
1861 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
1863 Version 1.31.0 (2018-12-06)
1864 ==========================
1868 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
1869 - [New lifetime elision rules now allow for eliding lifetimes in functions and
1870 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
1871 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
1873 - [You can now define and use `const` functions.][54835] These are currently
1874 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
1875 [language reference][const-reference] for what exactly is available.
1876 - [You can now use tool lints, which allow you to scope lints from external
1877 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
1878 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
1879 a crate, not just in exported functions.][54451]
1880 - [You can now use parentheses in pattern matches.][54497]
1884 - [Updated musl to 1.1.20][54430]
1888 - [You can now convert `num::NonZero*` types to their raw equivalents using the
1889 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
1890 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
1891 into `Option<&mut T>` using the `From` trait.][53218]
1892 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
1897 - [`slice::align_to`]
1898 - [`slice::align_to_mut`]
1899 - [`slice::chunks_exact`]
1900 - [`slice::chunks_exact_mut`]
1901 - [`slice::rchunks`]
1902 - [`slice::rchunks_mut`]
1903 - [`slice::rchunks_exact`]
1904 - [`slice::rchunks_exact_mut`]
1905 - [`Option::replace`]
1909 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
1910 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
1911 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
1913 [52813]: https://github.com/rust-lang/rust/pull/52813/
1914 [53218]: https://github.com/rust-lang/rust/pull/53218/
1915 [53555]: https://github.com/rust-lang/rust/issues/53555/
1916 [54057]: https://github.com/rust-lang/rust/pull/54057/
1917 [54240]: https://github.com/rust-lang/rust/pull/54240/
1918 [54430]: https://github.com/rust-lang/rust/pull/54430/
1919 [54451]: https://github.com/rust-lang/rust/pull/54451/
1920 [54497]: https://github.com/rust-lang/rust/pull/54497/
1921 [54778]: https://github.com/rust-lang/rust/pull/54778/
1922 [54835]: https://github.com/rust-lang/rust/pull/54835/
1923 [54870]: https://github.com/rust-lang/rust/pull/54870/
1924 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
1925 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
1926 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
1927 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
1928 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
1929 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
1930 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1931 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
1932 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1933 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
1934 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
1935 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
1936 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
1937 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
1939 Version 1.30.1 (2018-11-08)
1940 ===========================
1942 - [Fixed overflow ICE in rustdoc][54199]
1943 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
1945 [54199]: https://github.com/rust-lang/rust/pull/54199
1946 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
1948 Version 1.30.0 (2018-10-25)
1949 ==========================
1953 - [Procedural macros are now available.][52081] These kinds of macros allow for
1954 more powerful code generation. There is a [new chapter available][proc-macros]
1955 in the Rust Programming Language book that goes further in depth.
1956 - [You can now use keywords as identifiers using the raw identifiers
1957 syntax (`r#`),][53236] e.g. `let r#for = true;`
1958 - [Using anonymous parameters in traits is now deprecated with a warning and
1959 will be a hard error in the 2018 edition.][53272]
1960 - [You can now use `crate` in paths.][54404] This allows you to refer to the
1961 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
1962 - [Using a external crate no longer requires being prefixed with `::`.][54404]
1963 Previously, using a external crate in a module without a use statement
1964 required `let json = ::serde_json::from_str(foo);` but can now be written
1965 as `let json = serde_json::from_str(foo);`.
1966 - [You can now apply the `#[used]` attribute to static items to prevent the
1967 compiler from optimising them away, even if they appear to be unused,][51363]
1968 e.g. `#[used] static FOO: u32 = 1;`
1969 - [You can now import and reexport macros from other crates with the `use`
1970 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
1971 the root module of the crate. If your macro relies on calling other local
1972 macros, it is recommended to export with the
1973 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
1975 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
1976 using the `vis` specifier.][53370]
1977 - [Non-macro attributes now allow all forms of literals, not just
1978 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
1979 write `#[attr(true)]`.
1980 - [You can now specify a function to handle a panic in the Rust runtime with the
1981 `#[panic_handler]` attribute.][51366]
1985 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
1986 - [Added the `aarch64-unknown-netbsd` target][53165]
1990 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
1994 - [`Ipv4Addr::BROADCAST`]
1995 - [`Ipv4Addr::LOCALHOST`]
1996 - [`Ipv4Addr::UNSPECIFIED`]
1997 - [`Ipv6Addr::LOCALHOST`]
1998 - [`Ipv6Addr::UNSPECIFIED`]
1999 - [`Iterator::find_map`]
2001 The following methods are replacement methods for `trim_left`, `trim_right`,
2002 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2004 - [`str::trim_end_matches`]
2006 - [`str::trim_start_matches`]
2007 - [`str::trim_start`]
2011 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2012 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2013 equivalent to calling `rustdoc --error-format=json`.
2014 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2018 - [`rustdoc` allows you to specify what edition to treat your code as with the
2019 `--edition` option.][54057]
2020 - [`rustdoc` now has the `--color` (specify whether to output color) and
2021 `--error-format` (specify error format, e.g. `json`) options.][53003]
2022 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2023 debug symbols.][53774]
2024 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2025 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2027 [50911]: https://github.com/rust-lang/rust/pull/50911/
2028 [51363]: https://github.com/rust-lang/rust/pull/51363/
2029 [51366]: https://github.com/rust-lang/rust/pull/51366/
2030 [52081]: https://github.com/rust-lang/rust/pull/52081/
2031 [53003]: https://github.com/rust-lang/rust/pull/53003/
2032 [53033]: https://github.com/rust-lang/rust/pull/53033/
2033 [53044]: https://github.com/rust-lang/rust/pull/53044/
2034 [53165]: https://github.com/rust-lang/rust/pull/53165/
2035 [53213]: https://github.com/rust-lang/rust/pull/53213/
2036 [53236]: https://github.com/rust-lang/rust/pull/53236/
2037 [53272]: https://github.com/rust-lang/rust/pull/53272/
2038 [53370]: https://github.com/rust-lang/rust/pull/53370/
2039 [53459]: https://github.com/rust-lang/rust/pull/53459/
2040 [53774]: https://github.com/rust-lang/rust/pull/53774/
2041 [53822]: https://github.com/rust-lang/rust/pull/53822/
2042 [54057]: https://github.com/rust-lang/rust/pull/54057/
2043 [54146]: https://github.com/rust-lang/rust/pull/54146/
2044 [54404]: https://github.com/rust-lang/rust/pull/54404/
2045 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2046 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2047 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2048 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2050 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2051 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2052 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2053 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2054 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2055 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2056 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2057 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2058 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2059 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2062 Version 1.29.2 (2018-10-11)
2063 ===========================
2065 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2066 - The `rls-preview` component on the windows-gnu targets has been restored.
2068 [54639]: https://github.com/rust-lang/rust/pull/54639
2071 Version 1.29.1 (2018-09-25)
2072 ===========================
2077 - The standard library's `str::repeat` function contained an out of bounds write
2078 caused by an integer overflow. This has been fixed by deterministically
2079 panicking when an overflow happens.
2081 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2085 Version 1.29.0 (2018-09-13)
2086 ==========================
2090 - [Bumped minimum LLVM version to 5.0.][51899]
2091 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2092 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2096 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2097 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2098 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2099 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2101 - [`Cell<T>` now allows `T` to be unsized.][50494]
2102 - [`SocketAddr` is now stable on Redox.][52656]
2107 - [`Iterator::flatten`]
2112 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2113 `--locked` to disable this behavior.
2114 - [`cargo-install` will now allow you to cross compile an install
2115 using `--target`.][cargo/5614]
2116 - [Added the `cargo-fix` subcommand to automatically move project code from
2117 2015 edition to 2018.][cargo/5723]
2118 - [`cargo doc` can now optionally document private types using the
2119 `--document-private-items` flag.][cargo/5543]
2123 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2124 the specified level to that level.][52354] For example `--cap-lints warn`
2125 will demote `deny` and `forbid` lints to `warn`.
2126 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2127 fails and `101` if there is a panic.][52197]
2128 - [A preview of clippy has been made available through rustup.][51122]
2129 You can install the preview with `rustup component add clippy-preview`.
2133 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2134 Use `str::get_unchecked(begin..end)` instead.
2135 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2136 Consider using the `home_dir` function from
2137 https://crates.io/crates/dirs instead.
2138 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2139 - [`cfg` attributes and `--cfg` command line flags are now more
2140 strictly validated.][53893]
2142 [53893]: https://github.com/rust-lang/rust/pull/53893/
2143 [52861]: https://github.com/rust-lang/rust/pull/52861/
2144 [52656]: https://github.com/rust-lang/rust/pull/52656/
2145 [52239]: https://github.com/rust-lang/rust/pull/52239/
2146 [52330]: https://github.com/rust-lang/rust/pull/52330/
2147 [52354]: https://github.com/rust-lang/rust/pull/52354/
2148 [52402]: https://github.com/rust-lang/rust/pull/52402/
2149 [52103]: https://github.com/rust-lang/rust/pull/52103/
2150 [52197]: https://github.com/rust-lang/rust/pull/52197/
2151 [51807]: https://github.com/rust-lang/rust/pull/51807/
2152 [51899]: https://github.com/rust-lang/rust/pull/51899/
2153 [51912]: https://github.com/rust-lang/rust/pull/51912/
2154 [51511]: https://github.com/rust-lang/rust/pull/51511/
2155 [51619]: https://github.com/rust-lang/rust/pull/51619/
2156 [51656]: https://github.com/rust-lang/rust/pull/51656/
2157 [51178]: https://github.com/rust-lang/rust/pull/51178/
2158 [51122]: https://github.com/rust-lang/rust/pull/51122
2159 [50494]: https://github.com/rust-lang/rust/pull/50494/
2160 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2161 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2162 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2163 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2164 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2165 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2166 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2169 Version 1.28.0 (2018-08-02)
2170 ===========================
2174 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2175 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2176 the inner type across Foreign Function Interface (FFI) boundaries.
2177 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2178 and can now be used as identifiers.][51196]
2179 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2180 stable.][51241] This will allow users to specify a global allocator for
2182 - [Unit test functions marked with the `#[test]` attribute can now return
2183 `Result<(), E: Debug>` in addition to `()`.][51298]
2184 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2185 allows macros to easily target lifetimes.
2189 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2190 prioritise making smaller binary sizes. `z` is the same as `s` with the
2191 exception that it does not vectorise loops, which typically results in an even
2193 - [The short error format is now stable.][49546] Specified with
2194 `--error-format=short` this option will provide a more compressed output of
2195 rust error messages.
2196 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2197 - [Reduced the number of allocations in the macro parser.][50855] This can
2198 improve compile times of macro heavy crates on average by 5%.
2202 - [Implemented `Default` for `&mut str`.][51306]
2203 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2204 - [Implemented `Extend` for `()`.][50234]
2205 - [The `Debug` implementation of `time::Duration` should now be more easily
2206 human readable.][50364] Previously a `Duration` of one second would printed as
2207 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2208 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2209 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2210 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2211 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2212 for `PathBuf`.][50170]
2213 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2214 and `Wrapping<i128>`.][50465]
2215 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2216 possible.][51050] This can provide up to a 40% speed increase.
2217 - [Improved error messages when using `format!`.][50610]
2221 - [`Iterator::step_by`]
2222 - [`Path::ancestors`]
2223 - [`SystemTime::UNIX_EPOCH`]
2224 - [`alloc::GlobalAlloc`]
2226 - [`alloc::LayoutErr`]
2229 - [`alloc::alloc_zeroed`]
2230 - [`alloc::dealloc`]
2231 - [`alloc::realloc`]
2232 - [`alloc::handle_alloc_error`]
2233 - [`btree_map::Entry::or_default`]
2234 - [`fmt::Alignment`]
2235 - [`hash_map::Entry::or_default`]
2236 - [`iter::repeat_with`]
2237 - [`num::NonZeroUsize`]
2238 - [`num::NonZeroU128`]
2239 - [`num::NonZeroU16`]
2240 - [`num::NonZeroU32`]
2241 - [`num::NonZeroU64`]
2242 - [`num::NonZeroU8`]
2243 - [`ops::RangeBounds`]
2244 - [`slice::SliceIndex`]
2245 - [`slice::from_mut`]
2246 - [`slice::from_ref`]
2247 - [`{Any + Send + Sync}::downcast_mut`]
2248 - [`{Any + Send + Sync}::downcast_ref`]
2249 - [`{Any + Send + Sync}::is`]
2253 - [Cargo will now no longer allow you to publish crates with build scripts that
2254 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2255 considered to be immutable.
2259 - [The `suggestion_applicability` field in `rustc`'s json output is now
2260 stable.][50486] This will allow dev tools to check whether a code suggestion
2261 would apply to them.
2265 - [Rust will consider trait objects with duplicated constraints to be the same
2266 type as without the duplicated constraint.][51276] For example the below code will
2267 now fail to compile.
2272 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2275 impl Trait + Send + Send {
2276 fn test(&self) { println!("two"); }
2280 [49546]: https://github.com/rust-lang/rust/pull/49546/
2281 [50143]: https://github.com/rust-lang/rust/pull/50143/
2282 [50170]: https://github.com/rust-lang/rust/pull/50170/
2283 [50234]: https://github.com/rust-lang/rust/pull/50234/
2284 [50265]: https://github.com/rust-lang/rust/pull/50265/
2285 [50364]: https://github.com/rust-lang/rust/pull/50364/
2286 [50385]: https://github.com/rust-lang/rust/pull/50385/
2287 [50465]: https://github.com/rust-lang/rust/pull/50465/
2288 [50486]: https://github.com/rust-lang/rust/pull/50486/
2289 [50554]: https://github.com/rust-lang/rust/pull/50554/
2290 [50610]: https://github.com/rust-lang/rust/pull/50610/
2291 [50855]: https://github.com/rust-lang/rust/pull/50855/
2292 [51050]: https://github.com/rust-lang/rust/pull/51050/
2293 [51196]: https://github.com/rust-lang/rust/pull/51196/
2294 [51200]: https://github.com/rust-lang/rust/pull/51200/
2295 [51241]: https://github.com/rust-lang/rust/pull/51241/
2296 [51276]: https://github.com/rust-lang/rust/pull/51276/
2297 [51298]: https://github.com/rust-lang/rust/pull/51298/
2298 [51306]: https://github.com/rust-lang/rust/pull/51306/
2299 [51562]: https://github.com/rust-lang/rust/pull/51562/
2300 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2301 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2302 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2303 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2304 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2305 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2306 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2307 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2308 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2309 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2310 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2311 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2312 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2313 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2314 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2315 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2316 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2317 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2318 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2319 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2320 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2321 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2322 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2323 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2324 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2325 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2326 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2327 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2328 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2329 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2331 Version 1.27.2 (2018-07-20)
2332 ===========================
2337 - The borrow checker was fixed to avoid potential unsoundness when using
2338 match ergonomics: [#52213][52213].
2340 [52213]: https://github.com/rust-lang/rust/issues/52213
2342 Version 1.27.1 (2018-07-10)
2343 ===========================
2348 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2349 when running, which enabled executing code as some other user on a
2350 given machine. This release fixes that vulnerability; you can read
2351 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2353 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2358 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2359 match ergonomics: [#51415][51415], [#49534][49534].
2361 [51415]: https://github.com/rust-lang/rust/issues/51415
2362 [49534]: https://github.com/rust-lang/rust/issues/49534
2363 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2364 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2366 Version 1.27.0 (2018-06-21)
2367 ==========================
2371 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2372 be used as an identifier.
2373 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2374 bare `Trait` syntax, and should make it clearer when being used in tandem with
2375 `impl Trait` because it is equivalent to the following syntax:
2376 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2377 `Box<Trait> == Box<dyn Trait>`.
2378 - [Attributes on generic parameters such as types and lifetimes are
2379 now stable.][48851] e.g.
2380 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2381 - [The `#[must_use]` attribute can now also be used on functions as well as
2382 types.][48925] It provides a lint that by default warns users when the
2383 value returned by a function has not been used.
2387 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2391 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2392 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2393 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2394 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2395 the `cfg` attribute.
2396 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2397 std are now available in core.][49896]
2398 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2400 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2401 that the operation isn't done in place.
2402 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2403 the `#[must_use]` attribute][49533] to warn about unused potentially
2404 expensive allocations.
2408 - [`DoubleEndedIterator::rfind`]
2409 - [`DoubleEndedIterator::rfold`]
2410 - [`DoubleEndedIterator::try_rfold`]
2411 - [`Duration::from_micros`]
2412 - [`Duration::from_nanos`]
2413 - [`Duration::subsec_micros`]
2414 - [`Duration::subsec_millis`]
2415 - [`HashMap::remove_entry`]
2416 - [`Iterator::try_fold`]
2417 - [`Iterator::try_for_each`]
2419 - [`Option::filter`]
2420 - [`String::replace_range`]
2421 - [`Take::set_limit`]
2422 - [`hint::unreachable_unchecked`]
2423 - [`os::unix::process::parent_id`]
2424 - [`ptr::swap_nonoverlapping`]
2425 - [`slice::rsplit_mut`]
2427 - [`slice::swap_with_slice`]
2431 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2432 `readme`, and `repository` fields.][cargo/5386]
2433 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2434 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2435 a different directory than `target` for placing compilation artifacts.
2436 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2437 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2438 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2439 where cargo would infer a binary, Cargo will produce a warning. You can
2440 disable this feature ahead of time by setting any of the following to false:
2441 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2442 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2443 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2447 - [Added “The Rustc book” into the official documentation.][49707]
2448 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2449 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2453 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2454 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2455 compile, `"".is_empty()` will still compile.
2456 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2457 will only print the inner type.][48553] E.g.
2458 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2459 not `AtomicBool(true)`.
2460 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2461 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2462 alignment should cover all use cases.
2463 - The `.description()` method on the `std::error::Error` trait
2464 [has been soft-deprecated][50163]. It is no longer required to implement it.
2466 [48553]: https://github.com/rust-lang/rust/pull/48553/
2467 [48851]: https://github.com/rust-lang/rust/pull/48851/
2468 [48925]: https://github.com/rust-lang/rust/pull/48925/
2469 [49533]: https://github.com/rust-lang/rust/pull/49533/
2470 [49623]: https://github.com/rust-lang/rust/pull/49623/
2471 [49630]: https://github.com/rust-lang/rust/pull/49630/
2472 [49664]: https://github.com/rust-lang/rust/pull/49664/
2473 [49699]: https://github.com/rust-lang/rust/pull/49699/
2474 [49707]: https://github.com/rust-lang/rust/pull/49707/
2475 [49719]: https://github.com/rust-lang/rust/pull/49719/
2476 [49896]: https://github.com/rust-lang/rust/pull/49896/
2477 [49968]: https://github.com/rust-lang/rust/pull/49968/
2478 [50163]: https://github.com/rust-lang/rust/pull/50163
2479 [50177]: https://github.com/rust-lang/rust/pull/50177/
2480 [50378]: https://github.com/rust-lang/rust/pull/50378/
2481 [50398]: https://github.com/rust-lang/rust/pull/50398/
2482 [50423]: https://github.com/rust-lang/rust/pull/50423/
2483 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2484 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2485 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2486 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2487 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2488 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2489 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2490 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2491 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2492 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2493 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2494 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2495 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2496 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2497 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2498 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2499 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2500 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2501 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2502 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2503 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2504 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2505 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2506 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2507 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2508 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2509 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2510 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2511 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2512 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2515 Version 1.26.2 (2018-06-05)
2516 ==========================
2521 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2523 [51117]: https://github.com/rust-lang/rust/issues/51117
2526 Version 1.26.1 (2018-05-29)
2527 ==========================
2532 - [RLS now works on Windows.][50646]
2533 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2539 - [`fn main() -> impl Trait` no longer works for non-Termination
2541 This reverts an accidental stabilization.
2542 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2543 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2545 [50646]: https://github.com/rust-lang/rust/issues/50646
2546 [50656]: https://github.com/rust-lang/rust/pull/50656
2547 [50812]: https://github.com/rust-lang/rust/pull/50812
2548 [50950]: https://github.com/rust-lang/rust/issues/50950
2549 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2551 Version 1.26.0 (2018-05-10)
2552 ==========================
2556 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2557 implement either or both traits.][49299]
2558 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2559 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2560 lifetime can be elided.][49458]
2561 - [`impl Trait` is now stable allowing you to have abstract types in returns
2562 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2563 `fn open(path: impl AsRef<Path>)`.
2564 - [Pattern matching will now automatically apply dereferences.][49394]
2565 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2566 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2567 - [A lot of operations are now available in a const context.][46882] E.g. You
2568 can now index into constant arrays, reference and dereference into constants,
2569 and use tuple struct constructors.
2570 - [Fixed entry slice patterns are now stable.][48516] E.g.
2572 let points = [1, 2, 3, 4];
2574 [1, 2, 3, 4] => println!("All points were sequential."),
2575 _ => println!("Not all points were sequential."),
2582 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2583 - [Fixed exponential projection complexity on nested types.][48296]
2584 This can provide up to a ~12% reduction in compile times for certain crates.
2585 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2586 to remap path prefixes outputted by the compiler.
2587 - [Added `powerpc-unknown-netbsd` target.][48281]
2591 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2592 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2593 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2594 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2595 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2596 - [`ascii::escape_default` is now available in libcore.][48735]
2597 - [Trailing commas are now supported in std and core macros.][48056]
2598 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2599 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2604 - [`*const T::copy_to_nonoverlapping`]
2605 - [`*const T::copy_to`]
2606 - [`*const T::read_unaligned`]
2607 - [`*const T::read_volatile`]
2608 - [`*const T::read`]
2610 - [`*const T::wrapping_add`]
2611 - [`*const T::wrapping_sub`]
2613 - [`*mut T::copy_to_nonoverlapping`]
2614 - [`*mut T::copy_to`]
2615 - [`*mut T::read_unaligned`]
2616 - [`*mut T::read_volatile`]
2618 - [`*mut T::replace`]
2621 - [`*mut T::wrapping_add`]
2622 - [`*mut T::wrapping_sub`]
2623 - [`*mut T::write_bytes`]
2624 - [`*mut T::write_unaligned`]
2625 - [`*mut T::write_volatile`]
2628 - [`FromUtf8Error::as_bytes`]
2629 - [`LocalKey::try_with`]
2630 - [`Option::cloned`]
2631 - [`btree_map::Entry::and_modify`]
2632 - [`fs::read_to_string`]
2635 - [`hash_map::Entry::and_modify`]
2636 - [`iter::FusedIterator`]
2637 - [`ops::RangeInclusive`]
2638 - [`ops::RangeToInclusive`]
2640 - [`slice::rotate_left`]
2641 - [`slice::rotate_right`]
2642 - [`String::retain`]
2647 - [Cargo will now output path to custom commands when `-v` is
2648 passed with `--list`][cargo/5041]
2649 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2653 - [The second edition of "The Rust Programming Language" book is now recommended
2654 over the first.][48404]
2659 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2660 syntax is now invalid.
2662 use std::ops::Fn as dyn;
2663 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2665 - [The result of dereferences are no longer promoted to `'static`.][47408]
2669 const PAIR: &(i32, i32) = &(0, 1);
2670 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2673 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2674 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2676 - [Removed hoedown from rustdoc.][48274]
2677 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2679 [46882]: https://github.com/rust-lang/rust/pull/46882
2680 [47379]: https://github.com/rust-lang/rust/pull/47379
2681 [47408]: https://github.com/rust-lang/rust/pull/47408
2682 [47813]: https://github.com/rust-lang/rust/pull/47813
2683 [48056]: https://github.com/rust-lang/rust/pull/48056
2684 [48125]: https://github.com/rust-lang/rust/pull/48125
2685 [48166]: https://github.com/rust-lang/rust/pull/48166
2686 [48235]: https://github.com/rust-lang/rust/pull/48235
2687 [48274]: https://github.com/rust-lang/rust/pull/48274
2688 [48281]: https://github.com/rust-lang/rust/pull/48281
2689 [48296]: https://github.com/rust-lang/rust/pull/48296
2690 [48326]: https://github.com/rust-lang/rust/pull/48326
2691 [48359]: https://github.com/rust-lang/rust/pull/48359
2692 [48404]: https://github.com/rust-lang/rust/pull/48404
2693 [48481]: https://github.com/rust-lang/rust/pull/48481
2694 [48516]: https://github.com/rust-lang/rust/pull/48516
2695 [48628]: https://github.com/rust-lang/rust/pull/48628
2696 [48629]: https://github.com/rust-lang/rust/pull/48629
2697 [48657]: https://github.com/rust-lang/rust/pull/48657
2698 [48735]: https://github.com/rust-lang/rust/pull/48735
2699 [48978]: https://github.com/rust-lang/rust/pull/48978
2700 [49101]: https://github.com/rust-lang/rust/pull/49101
2701 [49109]: https://github.com/rust-lang/rust/pull/49109
2702 [49121]: https://github.com/rust-lang/rust/pull/49121
2703 [49162]: https://github.com/rust-lang/rust/pull/49162
2704 [49184]: https://github.com/rust-lang/rust/pull/49184
2705 [49234]: https://github.com/rust-lang/rust/pull/49234
2706 [49255]: https://github.com/rust-lang/rust/pull/49255
2707 [49299]: https://github.com/rust-lang/rust/pull/49299
2708 [49305]: https://github.com/rust-lang/rust/pull/49305
2709 [49394]: https://github.com/rust-lang/rust/pull/49394
2710 [49458]: https://github.com/rust-lang/rust/pull/49458
2711 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2712 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2713 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2714 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2715 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2716 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2717 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2718 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2719 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2720 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2721 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2722 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2723 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2724 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2725 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2726 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2727 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2728 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2729 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2730 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2731 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2732 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2733 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2734 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2735 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2736 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2737 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2738 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2739 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2740 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2741 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2742 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2743 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2744 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2745 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2746 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2747 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2748 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2749 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2750 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2751 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2752 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2755 Version 1.25.0 (2018-03-29)
2756 ==========================
2760 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2761 - [You can now use nested groups of imports.][47948]
2762 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2763 - [You can now have `|` at the start of a match arm.][47947] e.g.
2765 enum Foo { A, B, C }
2771 | Foo::B => println!("AB"),
2772 | Foo::C => println!("C"),
2779 - [Upgraded to LLVM 6.][47828]
2780 - [Added `-C lto=val` option.][47521]
2781 - [Added `i586-unknown-linux-musl` target][47282]
2785 - [Impl Send for `process::Command` on Unix.][47760]
2786 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2787 - [`UnsafeCell::into_inner` is now safe.][47204]
2788 - [Implement libstd for CloudABI.][47268]
2789 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2790 - [Implement `AsRef<Path>` for Component][46985]
2791 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2792 - [Moved `Duration` to libcore.][46666]
2796 - [`Location::column`]
2799 The following functions can now be used in a constant expression.
2800 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2801 - [`Duration::new`][47300]
2802 - [`Duration::from_secs`][47300]
2803 - [`Duration::from_millis`][47300]
2807 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2808 - [`cargo new` now defaults to creating a binary crate, instead of a
2809 library crate.][cargo/5029]
2813 - [Rust by example is now shipped with new releases][46196]
2817 - [Deprecated `net::lookup_host`.][47510]
2818 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
2819 - The borrow checker was sometimes incorrectly permitting overlapping borrows
2820 around indexing operations (see [#47349][47349]). This has been fixed (which also
2821 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
2822 - [Removed deprecated unstable attribute `#[simd]`.][47251]
2824 [33903]: https://github.com/rust-lang/rust/pull/33903
2825 [47947]: https://github.com/rust-lang/rust/pull/47947
2826 [47948]: https://github.com/rust-lang/rust/pull/47948
2827 [47760]: https://github.com/rust-lang/rust/pull/47760
2828 [47790]: https://github.com/rust-lang/rust/pull/47790
2829 [47828]: https://github.com/rust-lang/rust/pull/47828
2830 [47398]: https://github.com/rust-lang/rust/pull/47398
2831 [47510]: https://github.com/rust-lang/rust/pull/47510
2832 [47521]: https://github.com/rust-lang/rust/pull/47521
2833 [47204]: https://github.com/rust-lang/rust/pull/47204
2834 [47251]: https://github.com/rust-lang/rust/pull/47251
2835 [47268]: https://github.com/rust-lang/rust/pull/47268
2836 [47282]: https://github.com/rust-lang/rust/pull/47282
2837 [47300]: https://github.com/rust-lang/rust/pull/47300
2838 [47349]: https://github.com/rust-lang/rust/pull/47349
2839 [46931]: https://github.com/rust-lang/rust/pull/46931
2840 [46985]: https://github.com/rust-lang/rust/pull/46985
2841 [47006]: https://github.com/rust-lang/rust/pull/47006
2842 [46830]: https://github.com/rust-lang/rust/pull/46830
2843 [46095]: https://github.com/rust-lang/rust/pull/46095
2844 [46666]: https://github.com/rust-lang/rust/pull/46666
2845 [46196]: https://github.com/rust-lang/rust/pull/46196
2846 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
2847 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
2848 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
2849 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
2850 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
2853 Version 1.24.1 (2018-03-01)
2854 ==========================
2856 - [Do not abort when unwinding through FFI][48251]
2857 - [Emit UTF-16 files for linker arguments on Windows][48318]
2858 - [Make the error index generator work again][48308]
2859 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
2861 [48251]: https://github.com/rust-lang/rust/issues/48251
2862 [48308]: https://github.com/rust-lang/rust/issues/48308
2863 [48318]: https://github.com/rust-lang/rust/issues/48318
2864 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
2867 Version 1.24.0 (2018-02-15)
2868 ==========================
2872 - [External `sysv64` ffi is now available.][46528]
2873 eg. `extern "sysv64" fn foo () {}`
2877 - [rustc now uses 16 codegen units by default for release builds.][46910]
2878 For the fastest builds, utilize `codegen-units=1`.
2879 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
2880 - [Add `aarch64-unknown-openbsd` support][46760]
2884 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
2885 improvement in performance in the majority of cases.
2886 - [`OsStr`'s `Debug` implementation is now lossless and consistent
2887 with Windows.][46798]
2888 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
2889 - [impl `From<bool>` for `AtomicBool`][46293]
2890 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
2891 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
2892 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
2893 - [float::from_bits now just uses transmute.][46012] This provides
2894 some optimisations from LLVM.
2895 - [Copied `AsciiExt` methods onto `char`][46077]
2896 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
2897 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
2898 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
2899 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
2903 - [`RefCell::replace`]
2905 - [`atomic::spin_loop_hint`]
2907 The following functions can now be used in a constant expression.
2908 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
2910 - [`AtomicBool::new`][46287]
2911 - [`AtomicUsize::new`][46287]
2912 - [`AtomicIsize::new`][46287]
2913 - [`AtomicPtr::new`][46287]
2914 - [`Cell::new`][46287]
2915 - [`{integer}::min_value`][46287]
2916 - [`{integer}::max_value`][46287]
2917 - [`mem::size_of`][46287]
2918 - [`mem::align_of`][46287]
2919 - [`ptr::null`][46287]
2920 - [`ptr::null_mut`][46287]
2921 - [`RefCell::new`][46287]
2922 - [`UnsafeCell::new`][46287]
2926 - [Added a `workspace.default-members` config that
2927 overrides implied `--all` in virtual workspaces.][cargo/4743]
2928 - [Enable incremental by default on development builds.][cargo/4817] Also added
2929 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
2930 per-project or global basis respectively.
2937 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
2938 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
2939 in accordance with IETF RFC 4291 §2.2.
2940 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
2941 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
2942 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
2943 - [Leading zeros in tuple struct members is now an error][47084]
2944 - [`column!()` macro is one-based instead of zero-based][46977]
2945 - [`fmt::Arguments` can no longer be shared across threads][45198]
2946 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
2947 - [Cargo sets a different working directory for the compiler][cargo/4788]
2949 [44884]: https://github.com/rust-lang/rust/pull/44884
2950 [45198]: https://github.com/rust-lang/rust/pull/45198
2951 [45506]: https://github.com/rust-lang/rust/pull/45506
2952 [45904]: https://github.com/rust-lang/rust/pull/45904
2953 [45990]: https://github.com/rust-lang/rust/pull/45990
2954 [46012]: https://github.com/rust-lang/rust/pull/46012
2955 [46077]: https://github.com/rust-lang/rust/pull/46077
2956 [46094]: https://github.com/rust-lang/rust/pull/46094
2957 [46284]: https://github.com/rust-lang/rust/pull/46284
2958 [46287]: https://github.com/rust-lang/rust/pull/46287
2959 [46293]: https://github.com/rust-lang/rust/pull/46293
2960 [46528]: https://github.com/rust-lang/rust/pull/46528
2961 [46671]: https://github.com/rust-lang/rust/pull/46671
2962 [46713]: https://github.com/rust-lang/rust/pull/46713
2963 [46735]: https://github.com/rust-lang/rust/pull/46735
2964 [46749]: https://github.com/rust-lang/rust/pull/46749
2965 [46760]: https://github.com/rust-lang/rust/pull/46760
2966 [46798]: https://github.com/rust-lang/rust/pull/46798
2967 [46828]: https://github.com/rust-lang/rust/pull/46828
2968 [46831]: https://github.com/rust-lang/rust/pull/46831
2969 [46833]: https://github.com/rust-lang/rust/pull/46833
2970 [46910]: https://github.com/rust-lang/rust/pull/46910
2971 [46977]: https://github.com/rust-lang/rust/pull/46977
2972 [47018]: https://github.com/rust-lang/rust/pull/47018
2973 [47080]: https://github.com/rust-lang/rust/pull/47080
2974 [47084]: https://github.com/rust-lang/rust/pull/47084
2975 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
2976 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
2977 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
2978 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
2979 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
2980 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
2983 Version 1.23.0 (2018-01-04)
2984 ==========================
2988 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
2989 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
2990 Which should fix some confusing errors in some operations.
2994 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
2995 undefined behavior.][45920]
2996 - [rustc now suggests renaming import if names clash.][45660]
2997 - [Display errors/warnings correctly when there are zero-width or
2998 wide characters.][45711]
2999 - [rustc now avoids unnecessary copies of arguments that are
3000 simple bindings][45380] This should improve memory usage on average by 5-10%.
3001 - [Updated musl used to build musl rustc to 1.1.17][45393]
3005 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3006 - [Implement Hash for raw pointers to unsized types][45483]
3007 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3008 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3009 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3010 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3011 and `<*mut T>::as_mut`][44932]
3012 - [Optimized `Thread::{park, unpark}` implementation][45524]
3013 - [Improved `SliceExt::binary_search` performance.][45333]
3014 - [impl `FromIterator<()>` for `()`][45379]
3015 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3023 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3024 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3025 - [Added unit test checking to `cargo check`][cargo/4592]
3026 - [Cargo now lets you install a specific version
3027 using `cargo install --version`][cargo/4637]
3031 - [Releases now ship with the Cargo book documentation.][45692]
3032 - [rustdoc now prints rendering warnings on every run.][45324]
3036 - [Changes have been made to type equality to make it more correct,
3037 in rare cases this could break some code.][45853] [Tracking issue for
3038 further information][45852]
3039 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3040 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3041 Android 9, the minimum supported version is Android 14.
3042 - [Bumped the minimum LLVM to 3.9][45326]
3044 [44042]: https://github.com/rust-lang/rust/pull/44042
3045 [44932]: https://github.com/rust-lang/rust/pull/44932
3046 [45267]: https://github.com/rust-lang/rust/pull/45267
3047 [45324]: https://github.com/rust-lang/rust/pull/45324
3048 [45326]: https://github.com/rust-lang/rust/pull/45326
3049 [45333]: https://github.com/rust-lang/rust/pull/45333
3050 [45379]: https://github.com/rust-lang/rust/pull/45379
3051 [45380]: https://github.com/rust-lang/rust/pull/45380
3052 [45393]: https://github.com/rust-lang/rust/pull/45393
3053 [45435]: https://github.com/rust-lang/rust/pull/45435
3054 [45483]: https://github.com/rust-lang/rust/pull/45483
3055 [45524]: https://github.com/rust-lang/rust/pull/45524
3056 [45571]: https://github.com/rust-lang/rust/pull/45571
3057 [45580]: https://github.com/rust-lang/rust/pull/45580
3058 [45610]: https://github.com/rust-lang/rust/pull/45610
3059 [45660]: https://github.com/rust-lang/rust/pull/45660
3060 [45692]: https://github.com/rust-lang/rust/pull/45692
3061 [45711]: https://github.com/rust-lang/rust/pull/45711
3062 [45772]: https://github.com/rust-lang/rust/pull/45772
3063 [45852]: https://github.com/rust-lang/rust/issues/45852
3064 [45853]: https://github.com/rust-lang/rust/pull/45853
3065 [45887]: https://github.com/rust-lang/rust/pull/45887
3066 [45920]: https://github.com/rust-lang/rust/pull/45920
3067 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3068 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3069 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3072 Version 1.22.1 (2017-11-22)
3073 ==========================
3075 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3077 [46183]: https://github.com/rust-lang/rust/pull/46183
3079 Version 1.22.0 (2017-11-22)
3080 ==========================
3084 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3085 - [Now accepts underscores in unicode escapes][43716]
3086 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3087 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3091 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3092 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3093 This should decrease compile times for debug builds.
3094 - [strict memory alignment now enabled on ARMv6][45094]
3095 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3099 - [Allow atomic operations up to 32 bits
3100 on `armv5te_unknown_linux_gnueabi`][44978]
3101 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3102 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3103 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3104 - [Properly detect overflow in `Instant += Duration`.][44220]
3105 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3106 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3107 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3114 - [Cargo will now build multi file examples in subdirectories of the `examples`
3115 folder that have a `main.rs` file.][cargo/4496]
3116 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3117 the old format will continue to work and can be updated with `cargo update`.
3118 - [Now supports vendoring git repositories][cargo/3992]
3122 - [`libbacktrace` is now available on Apple platforms.][44251]
3123 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3124 This now lets you specify that a given code example will fail to compile.
3128 - [The minimum Android version that rustc can build for has been bumped
3129 to `4.0` from `2.3`][45656]
3130 - [Allowing `T op= &T` for numeric types has broken some type
3131 inference cases][45480]
3134 [42526]: https://github.com/rust-lang/rust/pull/42526
3135 [43017]: https://github.com/rust-lang/rust/pull/43017
3136 [43716]: https://github.com/rust-lang/rust/pull/43716
3137 [43949]: https://github.com/rust-lang/rust/pull/43949
3138 [44015]: https://github.com/rust-lang/rust/pull/44015
3139 [44220]: https://github.com/rust-lang/rust/pull/44220
3140 [44251]: https://github.com/rust-lang/rust/pull/44251
3141 [44287]: https://github.com/rust-lang/rust/pull/44287
3142 [44303]: https://github.com/rust-lang/rust/pull/44303
3143 [44456]: https://github.com/rust-lang/rust/pull/44456
3144 [44466]: https://github.com/rust-lang/rust/pull/44466
3145 [44895]: https://github.com/rust-lang/rust/pull/44895
3146 [44966]: https://github.com/rust-lang/rust/pull/44966
3147 [44978]: https://github.com/rust-lang/rust/pull/44978
3148 [45041]: https://github.com/rust-lang/rust/pull/45041
3149 [45064]: https://github.com/rust-lang/rust/pull/45064
3150 [45075]: https://github.com/rust-lang/rust/pull/45075
3151 [45094]: https://github.com/rust-lang/rust/pull/45094
3152 [45095]: https://github.com/rust-lang/rust/pull/45095
3153 [45480]: https://github.com/rust-lang/rust/issues/45480
3154 [45656]: https://github.com/rust-lang/rust/pull/45656
3155 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3156 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3157 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3164 Version 1.21.0 (2017-10-12)
3165 ==========================
3169 - [You can now use static references for literals.][43838]
3173 let x: &'static u32 = &0;
3176 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3179 my_macro!(Vec<i32>::new); // Always worked
3180 my_macro!(Vec::<i32>::new); // Now works
3185 - [Upgraded jemalloc to 4.5.0][43911]
3186 - [Enabled unwinding panics on Redox][43917]
3187 - [Now runs LLVM in parallel during translation phase.][43506]
3188 This should reduce peak memory usage.
3192 - [Generate builtin impls for `Clone` for all arrays and tuples that
3193 are `T: Clone`][43690]
3194 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3195 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3196 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3201 [`std::mem::discriminant`]
3205 - [You can now call `cargo install` with multiple package names][cargo/4216]
3206 - [Cargo commands inside a virtual workspace will now implicitly
3207 pass `--all`][cargo/4335]
3208 - [Added a `[patch]` section to `Cargo.toml` to handle
3209 prepublication dependencies][cargo/4123] [RFC 1969]
3210 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3211 like patterns][cargo/4270]
3212 - [Added the `--all-targets` option][cargo/4400]
3213 - [Using required dependencies as a feature is now deprecated and emits
3214 a warning][cargo/4364]
3219 - [Cargo docs are moving][43916]
3220 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3221 - [The rustdoc book is now available][43863]
3222 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3223 - [Added a preview of RLS has been made available through rustup][44204]
3224 Install with `rustup component add rls-preview`
3225 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3226 Previously only showed `std::os::unix`.
3230 - [Changes in method matching against higher-ranked types][43880] This may cause
3231 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3232 - [rustc's JSON error output's byte position start at top of file.][42973]
3233 Was previously relative to the rustc's internal `CodeMap` struct which
3234 required the unstable library `libsyntax` to correctly use.
3235 - [`unused_results` lint no longer ignores booleans][43728]
3237 [42565]: https://github.com/rust-lang/rust/pull/42565
3238 [42973]: https://github.com/rust-lang/rust/pull/42973
3239 [43348]: https://github.com/rust-lang/rust/pull/43348
3240 [43459]: https://github.com/rust-lang/rust/pull/43459
3241 [43506]: https://github.com/rust-lang/rust/pull/43506
3242 [43540]: https://github.com/rust-lang/rust/pull/43540
3243 [43690]: https://github.com/rust-lang/rust/pull/43690
3244 [43728]: https://github.com/rust-lang/rust/pull/43728
3245 [43838]: https://github.com/rust-lang/rust/pull/43838
3246 [43863]: https://github.com/rust-lang/rust/pull/43863
3247 [43880]: https://github.com/rust-lang/rust/pull/43880
3248 [43911]: https://github.com/rust-lang/rust/pull/43911
3249 [43916]: https://github.com/rust-lang/rust/pull/43916
3250 [43917]: https://github.com/rust-lang/rust/pull/43917
3251 [44204]: https://github.com/rust-lang/rust/pull/44204
3252 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3253 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3254 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3255 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3256 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3257 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3258 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3259 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3260 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3262 Version 1.20.0 (2017-08-31)
3263 ===========================
3267 - [Associated constants are now stabilised.][42809]
3268 - [A lot of macro bugs are now fixed.][42913]
3273 - [Struct fields are now properly coerced to the expected field type.][42807]
3274 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3275 `wasm32-experimental-emscripten` target.
3276 - [Changed some of the error messages to be more helpful.][42033]
3277 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3279 - [rustc now reports the total number of errors on compilation failure][43015]
3280 previously this was only the number of errors in the pass that failed.
3281 - [Expansion in rustc has been sped up 29x.][42533]
3282 - [added `msp430-none-elf` target.][43099]
3283 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3285 - [Fixes backtraces on Redox][43228]
3286 - [rustc now identifies different versions of same crate when absolute paths of
3287 different types match in an error message.][42826]
3293 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3294 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3296 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3297 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3298 - [Impl `Clone` for `DefaultHasher`.][42799]
3299 - [Impl `Sync` for `SyncSender`.][42397]
3300 - [Impl `FromStr` for `char`][42271]
3301 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3303 - [allow messages in the `unimplemented!()` macro.][42155]
3304 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3305 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3306 - [Upgrade to Unicode 10.0.0][42999]
3307 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3308 - [Skip the main thread's manual stack guard on Linux][43072]
3309 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3310 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3312 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3317 - [`CStr::into_c_string`]
3318 - [`CString::as_c_str`]
3319 - [`CString::into_boxed_c_str`]
3320 - [`Chain::get_mut`]
3321 - [`Chain::get_ref`]
3322 - [`Chain::into_inner`]
3323 - [`Option::get_or_insert_with`]
3324 - [`Option::get_or_insert`]
3325 - [`OsStr::into_os_string`]
3326 - [`OsString::into_boxed_os_str`]
3329 - [`Utf8Error::error_len`]
3330 - [`char::EscapeDebug`]
3331 - [`char::escape_debug`]
3332 - [`compile_error!`]
3333 - [`f32::from_bits`]
3335 - [`f64::from_bits`]
3337 - [`mem::ManuallyDrop`]
3338 - [`slice::sort_unstable_by_key`]
3339 - [`slice::sort_unstable_by`]
3340 - [`slice::sort_unstable`]
3341 - [`str::from_boxed_utf8_unchecked`]
3342 - [`str::as_bytes_mut`]
3343 - [`str::as_bytes_mut`]
3344 - [`str::from_utf8_mut`]
3345 - [`str::from_utf8_unchecked_mut`]
3347 - [`str::get_unchecked_mut`]
3348 - [`str::get_unchecked`]
3350 - [`str::into_boxed_bytes`]
3355 - [Cargo API token location moved from `~/.cargo/config` to
3356 `~/.cargo/credentials`.][cargo/3978]
3357 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3358 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3359 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3360 - [You can now specify version of a binary when installed through
3361 `cargo install` using `--vers`.][cargo/4229]
3362 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3363 failure.][cargo/4248]
3364 - [Changed the convention around which file is the crate root.][cargo/4259]
3365 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3366 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3371 - [Functions with `'static` in their return types will now not be as usable as
3372 if they were using lifetime parameters instead.][42417]
3373 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3374 takes the sign of NaN into account where previously didn't.][42430]
3376 [42033]: https://github.com/rust-lang/rust/pull/42033
3377 [42155]: https://github.com/rust-lang/rust/pull/42155
3378 [42271]: https://github.com/rust-lang/rust/pull/42271
3379 [42397]: https://github.com/rust-lang/rust/pull/42397
3380 [42417]: https://github.com/rust-lang/rust/pull/42417
3381 [42430]: https://github.com/rust-lang/rust/pull/42430
3382 [42431]: https://github.com/rust-lang/rust/pull/42431
3383 [42533]: https://github.com/rust-lang/rust/pull/42533
3384 [42571]: https://github.com/rust-lang/rust/pull/42571
3385 [42613]: https://github.com/rust-lang/rust/pull/42613
3386 [42799]: https://github.com/rust-lang/rust/pull/42799
3387 [42807]: https://github.com/rust-lang/rust/pull/42807
3388 [42809]: https://github.com/rust-lang/rust/pull/42809
3389 [42822]: https://github.com/rust-lang/rust/pull/42822
3390 [42826]: https://github.com/rust-lang/rust/pull/42826
3391 [42854]: https://github.com/rust-lang/rust/pull/42854
3392 [42913]: https://github.com/rust-lang/rust/pull/42913
3393 [42999]: https://github.com/rust-lang/rust/pull/42999
3394 [43011]: https://github.com/rust-lang/rust/pull/43011
3395 [43015]: https://github.com/rust-lang/rust/pull/43015
3396 [43072]: https://github.com/rust-lang/rust/pull/43072
3397 [43077]: https://github.com/rust-lang/rust/pull/43077
3398 [43097]: https://github.com/rust-lang/rust/pull/43097
3399 [43099]: https://github.com/rust-lang/rust/pull/43099
3400 [43170]: https://github.com/rust-lang/rust/pull/43170
3401 [43178]: https://github.com/rust-lang/rust/pull/43178
3402 [43185]: https://github.com/rust-lang/rust/pull/43185
3403 [43228]: https://github.com/rust-lang/rust/pull/43228
3404 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3405 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3406 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3407 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3408 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3409 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3410 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3411 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3412 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3413 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3414 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3415 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3416 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3417 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3418 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3419 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3420 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3421 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3422 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3423 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3424 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3425 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3426 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3427 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3428 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3429 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3430 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3431 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3432 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3433 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3434 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3435 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3436 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3437 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3438 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3439 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3440 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3441 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3442 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3445 Version 1.19.0 (2017-07-20)
3446 ===========================
3451 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3452 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3453 - [Macro recursion limit increased to 1024 from 64.][41676]
3454 - [Added lint for detecting unused macros.][41907]
3455 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3456 For example: `let x = loop { break 7; };`
3457 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3458 contain `Copy` types and cannot have a `Drop` implementation.
3459 Example: `union Foo { bar: u8, baz: usize }`
3460 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3461 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3466 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3467 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3468 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3469 you should use `--target armv7-linux-androideabi`.
3470 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3471 - [Minor optimisation of string operations.][42037]
3472 - [Compiler error message is now `aborting due to previous error(s)` instead of
3473 `aborting due to N previous errors`][42150] This was previously inaccurate and
3474 would only count certain kinds of errors.
3475 - [The compiler now supports Visual Studio 2017][42225]
3476 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3477 - [Added a lot][42264] of [new error codes][42302]
3478 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3479 libraries with C Run-time Libraries(CRT) to be statically linked.
3480 - [Fixed various ARM codegen bugs][42740]
3485 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3486 `Extend<Cow<'a, str>>`][41449]
3487 - [`Vec` now implements `From<&mut [T]>`][41530]
3488 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3489 - [`SplitWhitespace` now implements `Clone`][41659]
3490 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3492 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3493 macros, but for printing to stderr.
3498 - [`OsString::shrink_to_fit`]
3501 - [`thread::ThreadId`]
3506 - [Build scripts can now add environment variables to the environment
3507 the crate is being compiled in.
3508 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3509 - [Subcommands now replace the current process rather than spawning a new
3510 child process][cargo/3970]
3511 - [Workspace members can now accept glob file patterns][cargo/3979]
3512 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3513 the members in a given workspace.][cargo/3988]
3514 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3515 - [Target directory path is now in the cargo metadata][cargo/4022]
3516 - [Cargo no longer checks out a local working directory for the
3517 crates.io index][cargo/4026] This should provide smaller file size for the
3518 registry, and improve cloning times, especially on Windows machines.
3519 - [Added an `--exclude` option for excluding certain packages when using the
3520 `--all` option][cargo/4031]
3521 - [Cargo will now automatically retry when receiving a 5xx error
3522 from crates.io][cargo/4032]
3523 - [The `--features` option now accepts multiple comma or space
3524 delimited values.][cargo/4084]
3525 - [Added support for custom target specific runners][cargo/3954]
3530 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3532 - [Rust will now release XZ compressed packages][rust-installer/57]
3533 - [rustup will now prefer to download rust packages with
3534 XZ compression][rustup/1100] over GZip packages.
3535 - [Added the ability to escape `#` in rust documentation][41785] By adding
3536 additional `#`'s ie. `##` is now `#`
3541 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3542 - [`-Z` flags are now no longer allowed to be used on the stable
3543 compiler.][41751] This has been a warning for a year previous to this.
3544 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3545 longer works][42844]. Users should migrate to the built-in `check`
3546 command, which has been available since 1.16.
3547 - [Ending a float literal with `._` is now a hard error.
3548 Example: `42._` .][41946]
3549 - [Any use of a private `extern crate` outside of its module is now a
3550 hard error.][36886] This was previously a warning.
3551 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3552 relative while the `::` prefix makes a path absolute, but was ignored and the
3553 path was relative regardless.
3554 - [Floating point constants in match patterns is now a hard error][36890]
3555 This was previously a warning.
3556 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3557 match patterns is now a hard error][36891] This was previously a warning.
3558 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3560 - [From the pound escape, lines consisting of multiple `#`s are
3562 - [It is an error to re-export private enum variants][42460]. This is
3563 known to break a number of crates that depend on an older version of
3565 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3566 to use it to find the linker, and the build will fail where it did
3567 not previously][42607]
3569 [36886]: https://github.com/rust-lang/rust/issues/36886
3570 [36888]: https://github.com/rust-lang/rust/issues/36888
3571 [36890]: https://github.com/rust-lang/rust/issues/36890
3572 [36891]: https://github.com/rust-lang/rust/issues/36891
3573 [36892]: https://github.com/rust-lang/rust/issues/36892
3574 [37406]: https://github.com/rust-lang/rust/issues/37406
3575 [39983]: https://github.com/rust-lang/rust/pull/39983
3576 [41145]: https://github.com/rust-lang/rust/pull/41145
3577 [41192]: https://github.com/rust-lang/rust/pull/41192
3578 [41258]: https://github.com/rust-lang/rust/pull/41258
3579 [41370]: https://github.com/rust-lang/rust/pull/41370
3580 [41449]: https://github.com/rust-lang/rust/pull/41449
3581 [41530]: https://github.com/rust-lang/rust/pull/41530
3582 [41624]: https://github.com/rust-lang/rust/pull/41624
3583 [41656]: https://github.com/rust-lang/rust/pull/41656
3584 [41659]: https://github.com/rust-lang/rust/pull/41659
3585 [41676]: https://github.com/rust-lang/rust/pull/41676
3586 [41751]: https://github.com/rust-lang/rust/pull/41751
3587 [41764]: https://github.com/rust-lang/rust/pull/41764
3588 [41785]: https://github.com/rust-lang/rust/pull/41785
3589 [41873]: https://github.com/rust-lang/rust/pull/41873
3590 [41907]: https://github.com/rust-lang/rust/pull/41907
3591 [41946]: https://github.com/rust-lang/rust/pull/41946
3592 [42016]: https://github.com/rust-lang/rust/pull/42016
3593 [42037]: https://github.com/rust-lang/rust/pull/42037
3594 [42068]: https://github.com/rust-lang/rust/pull/42068
3595 [42150]: https://github.com/rust-lang/rust/pull/42150
3596 [42162]: https://github.com/rust-lang/rust/pull/42162
3597 [42225]: https://github.com/rust-lang/rust/pull/42225
3598 [42264]: https://github.com/rust-lang/rust/pull/42264
3599 [42302]: https://github.com/rust-lang/rust/pull/42302
3600 [42460]: https://github.com/rust-lang/rust/issues/42460
3601 [42607]: https://github.com/rust-lang/rust/issues/42607
3602 [42740]: https://github.com/rust-lang/rust/pull/42740
3603 [42844]: https://github.com/rust-lang/rust/issues/42844
3604 [42948]: https://github.com/rust-lang/rust/pull/42948
3605 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3606 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3607 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3608 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3609 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3610 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3611 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3612 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3613 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3614 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3615 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3616 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3617 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3618 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3619 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3620 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3621 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3622 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3623 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3624 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3625 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3626 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3629 Version 1.18.0 (2017-06-08)
3630 ===========================
3635 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3636 make the item visible to just that module tree. Also accepts the keyword
3637 `crate` to make something public to the whole crate but not users of the
3638 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3639 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3640 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3641 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3642 types like `Write + Send`, trailing `+` are now supported in trait objects,
3643 and better error reporting for trait objects starting with `?Sized`.
3644 - [0e+10 is now a valid floating point literal][40589]
3645 - [Now warns if you bind a lifetime parameter to 'static][40734]
3646 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3647 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3648 representation in some cases.][40377]
3653 - [rustc can now emit mir with `--emit mir`][39891]
3654 - [Improved LLVM IR for trivial functions][40367]
3655 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3656 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3657 opportunities found through profiling
3658 - [Improved backtrace formatting when panicking][38165]
3663 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3664 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3665 iteration or reallocation.
3666 - [Simplified HashMap Bucket interface][40561] provides performance
3667 improvements for iterating and cloning.
3668 - [Specialize Vec::from_elem to use calloc][40409]
3669 - [Fixed Race condition in fs::create_dir_all][39799]
3670 - [No longer caching stdio on Windows][40516]
3671 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3672 2.50%~ faster and in one case now 12.50% faster.
3673 - [Optimized `AtomicBool::fetch_nand`][41143]
3678 - [`Child::try_wait`]
3679 - [`HashMap::retain`]
3680 - [`HashSet::retain`]
3682 - [`TcpStream::peek`]
3683 - [`UdpSocket::peek`]
3684 - [`UdpSocket::peek_from`]
3689 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3690 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3691 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3692 - [Added Android build support][cargo/3885]
3693 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3694 of a certain type, for example `cargo build --bins` will build all
3696 - [Added support for haiku][cargo/3952]
3701 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3702 - [Added rust-windbg script for better debugging on Windows][39983]
3703 - [Rust now uses the official cross compiler for NetBSD][40612]
3704 - [rustdoc now accepts `#` at the start of files][40828]
3705 - [Fixed jemalloc support for musl][41168]
3710 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3711 always placed after the sign if it exists and before the digits. With the `#`
3712 flag the zeroes are placed after the prefix and before the digits.
3713 - [Due to the struct field optimisation][40377], using `transmute` on structs
3714 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3715 always been undefined behavior, but is now more likely to break in practice.
3716 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3717 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3718 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3719 - [Overlapping inherent `impl`s are now a hard error][40728]
3720 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3721 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3722 `out.asm` and `out.ll` instead of only one of the filetypes.
3723 - [ calling a function that returns `Self` will no longer work][41805] when
3724 the size of `Self` cannot be statically determined.
3725 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3726 this has caused a few regressions namely:
3728 - Changed the link order of local static/dynamic libraries (respecting the
3729 order on given rather than having the compiler reorder).
3730 - Changed how MinGW is linked, native code linked to dynamic libraries
3731 may require manually linking to the gcc support library (for the native
3734 [38165]: https://github.com/rust-lang/rust/pull/38165
3735 [39799]: https://github.com/rust-lang/rust/pull/39799
3736 [39891]: https://github.com/rust-lang/rust/pull/39891
3737 [39983]: https://github.com/rust-lang/rust/pull/39983
3738 [40043]: https://github.com/rust-lang/rust/pull/40043
3739 [40241]: https://github.com/rust-lang/rust/pull/40241
3740 [40338]: https://github.com/rust-lang/rust/pull/40338
3741 [40367]: https://github.com/rust-lang/rust/pull/40367
3742 [40377]: https://github.com/rust-lang/rust/pull/40377
3743 [40409]: https://github.com/rust-lang/rust/pull/40409
3744 [40516]: https://github.com/rust-lang/rust/pull/40516
3745 [40556]: https://github.com/rust-lang/rust/pull/40556
3746 [40561]: https://github.com/rust-lang/rust/pull/40561
3747 [40589]: https://github.com/rust-lang/rust/pull/40589
3748 [40612]: https://github.com/rust-lang/rust/pull/40612
3749 [40723]: https://github.com/rust-lang/rust/pull/40723
3750 [40728]: https://github.com/rust-lang/rust/pull/40728
3751 [40731]: https://github.com/rust-lang/rust/pull/40731
3752 [40734]: https://github.com/rust-lang/rust/pull/40734
3753 [40805]: https://github.com/rust-lang/rust/pull/40805
3754 [40807]: https://github.com/rust-lang/rust/pull/40807
3755 [40828]: https://github.com/rust-lang/rust/pull/40828
3756 [40870]: https://github.com/rust-lang/rust/pull/40870
3757 [41085]: https://github.com/rust-lang/rust/pull/41085
3758 [41143]: https://github.com/rust-lang/rust/pull/41143
3759 [41168]: https://github.com/rust-lang/rust/pull/41168
3760 [41270]: https://github.com/rust-lang/rust/issues/41270
3761 [41469]: https://github.com/rust-lang/rust/pull/41469
3762 [41805]: https://github.com/rust-lang/rust/issues/41805
3763 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3764 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3765 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3766 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3767 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3768 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3769 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3770 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3771 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3772 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3773 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3774 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3775 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3776 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3779 Version 1.17.0 (2017-04-27)
3780 ===========================
3785 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3786 * [Fields of structs may be initialized without duplicating the field/variable
3787 names][39761]. [RFC 1682]
3788 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3789 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3790 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3791 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3792 `'b`. Soundness fix.
3793 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3794 * [Static variables may contain references to other statics][40027]
3799 * [Exit quickly on only `--emit dep-info`][40336]
3800 * [Make `-C relocation-model` more correctly determine whether the linker
3801 creates a position-independent executable][40245]
3802 * [Add `-C overflow-checks` to directly control whether integer overflow
3804 * [The rustc type checker now checks items on demand instead of in a single
3805 in-order pass][40008]. This is mostly an internal refactoring in support of
3806 future work, including incremental type checking, but also resolves [RFC
3807 1647], allowing `Self` to appear in `impl` `where` clauses.
3808 * [Optimize vtable loads][39995]
3809 * [Turn off vectorization for Emscripten targets][39990]
3810 * [Provide suggestions for unknown macros imported with `use`][39953]
3811 * [Fix ICEs in path resolution][39939]
3812 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
3813 * [Add clearer error message using `&str + &str`][39116]
3824 * [`Ordering::then`]
3825 * [`Ordering::then_with`]
3826 * [`BTreeMap::range`]
3827 * [`BTreeMap::range_mut`]
3828 * [`collections::Bound`]
3829 * [`process::abort`]
3830 * [`ptr::read_unaligned`]
3831 * [`ptr::write_unaligned`]
3832 * [`Result::expect_err`]
3835 * [`Cell::into_inner`]
3841 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
3842 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
3843 * [`String` implements `FromIterator<&char>`][40028]
3844 * `Box` [implements][40009] a number of new conversions:
3845 `From<Box<str>> for String`,
3846 `From<Box<[T]>> for Vec<T>`,
3847 `From<Box<CStr>> for CString`,
3848 `From<Box<OsStr>> for OsString`,
3849 `From<Box<Path>> for PathBuf`,
3850 `Into<Box<str>> for String`,
3851 `Into<Box<[T]>> for Vec<T>`,
3852 `Into<Box<CStr>> for CString`,
3853 `Into<Box<OsStr>> for OsString`,
3854 `Into<Box<Path>> for PathBuf`,
3855 `Default for Box<str>`,
3856 `Default for Box<CStr>`,
3857 `Default for Box<OsStr>`,
3858 `From<&CStr> for Box<CStr>`,
3859 `From<&OsStr> for Box<OsStr>`,
3860 `From<&Path> for Box<Path>`
3861 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
3862 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
3863 * [Slightly optimize `slice::sort`][39538]
3864 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
3865 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
3866 `Box<str>` implements `From<&str>`][39438]
3867 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
3868 `From<(I, u16)> where I: Into<IpAddr>`][39372]
3869 * [`format!` estimates the needed capacity before writing a string][39356]
3870 * [Support unprivileged symlink creation in Windows][38921]
3871 * [`PathBuf` implements `Default`][38764]
3872 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
3873 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
3874 and poor hash functions.
3879 * [Add `cargo check --all`][cargo/3731]
3880 * [Add an option to ignore SSL revocation checking][cargo/3699]
3881 * [Add `cargo run --package`][cargo/3691]
3882 * [Add `required_features`][cargo/3667]
3883 * [Assume `build.rs` is a build script][cargo/3664]
3884 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
3889 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
3891 * [The "Unstable Book" documents nightly-only features][ubook]
3892 * [Improve the style of the sidebar in rustdoc output][40265]
3893 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
3894 * [Fix MSP430 breakage due to `i128`][40257]
3895 * [Preliminary Solaris/SPARCv9 support][39903]
3896 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
3897 run without installing the MSVC runtime.
3898 * [`rustdoc --test` includes file names in test names][39788]
3899 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
3900 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
3901 * [Initial support for `aarch64-unknown-freebsd`][39491]
3902 * [Initial support for `i686-unknown-netbsd`][39426]
3903 * [This release no longer includes the old makefile build system][39431]. Rust
3904 is built with a custom build system, written in Rust, and with Cargo.
3905 * [Add Debug implementations for libcollection structs][39002]
3906 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
3907 * [`--test-threads=0` produces an error][38945]
3908 * [`rustup` installs documentation by default][40526]
3909 * [The Rust source includes NatVis visualizations][39843]. These can be used by
3910 WinDbg and Visual Studio to improve the debugging experience.
3915 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
3916 workaround, either use MSVC 2015 or run vcvars.bat.
3917 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3918 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
3919 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
3921 * [`format!` and `Display::to_string` panic if an underlying formatting
3922 implementation returns an error][40117]. Previously the error was silently
3923 ignored. It is incorrect for `write_fmt` to return an error when writing
3925 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
3926 crates were marked stable and could be accessed from the stable toolchain.
3927 * [Rust git source no longer includes vendored crates][39728]. Those that need
3928 to build with vendored crates should build from release tarballs.
3929 * [Fix inert attributes from `proc_macro_derives`][39572]
3930 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
3931 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
3933 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
3934 existing code generally ignores the type of dead-code unless a type-hint is
3935 provided; this can cause surprising inference interactions particularly around
3936 defaulting. The new code uniformly ignores the result type of dead-code.
3937 * [Tuple-struct constructors with private fields are no longer visible][38932]
3938 * [Lifetime parameters that do not appear in the arguments are now considered
3939 early-bound][38897], resolving a soundness bug (#[32330]). The
3940 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
3942 * [rustdoc: fix doctests with non-feature crate attributes][38161]
3943 * [Make transmuting from fn item types to pointer-sized types a hard
3946 [27787]: https://github.com/rust-lang/rust/issues/27787
3947 [32330]: https://github.com/rust-lang/rust/issues/32330
3948 [34198]: https://github.com/rust-lang/rust/pull/34198
3949 [38161]: https://github.com/rust-lang/rust/pull/38161
3950 [38368]: https://github.com/rust-lang/rust/pull/38368
3951 [38584]: https://github.com/rust-lang/rust/issues/38584
3952 [38661]: https://github.com/rust-lang/rust/pull/38661
3953 [38764]: https://github.com/rust-lang/rust/pull/38764
3954 [38864]: https://github.com/rust-lang/rust/issues/38864
3955 [38897]: https://github.com/rust-lang/rust/pull/38897
3956 [38921]: https://github.com/rust-lang/rust/pull/38921
3957 [38932]: https://github.com/rust-lang/rust/pull/38932
3958 [38945]: https://github.com/rust-lang/rust/pull/38945
3959 [38981]: https://github.com/rust-lang/rust/pull/38981
3960 [39002]: https://github.com/rust-lang/rust/pull/39002
3961 [39116]: https://github.com/rust-lang/rust/pull/39116
3962 [39193]: https://github.com/rust-lang/rust/pull/39193
3963 [39265]: https://github.com/rust-lang/rust/pull/39265
3964 [39356]: https://github.com/rust-lang/rust/pull/39356
3965 [39372]: https://github.com/rust-lang/rust/pull/39372
3966 [39426]: https://github.com/rust-lang/rust/pull/39426
3967 [39431]: https://github.com/rust-lang/rust/pull/39431
3968 [39438]: https://github.com/rust-lang/rust/pull/39438
3969 [39440]: https://github.com/rust-lang/rust/pull/39440
3970 [39485]: https://github.com/rust-lang/rust/pull/39485
3971 [39491]: https://github.com/rust-lang/rust/pull/39491
3972 [39518]: https://github.com/rust-lang/rust/pull/39518
3973 [39538]: https://github.com/rust-lang/rust/pull/39538
3974 [39572]: https://github.com/rust-lang/rust/pull/39572
3975 [39633]: https://github.com/rust-lang/rust/pull/39633
3976 [39642]: https://github.com/rust-lang/rust/pull/39642
3977 [39728]: https://github.com/rust-lang/rust/pull/39728
3978 [39761]: https://github.com/rust-lang/rust/pull/39761
3979 [39788]: https://github.com/rust-lang/rust/pull/39788
3980 [39793]: https://github.com/rust-lang/rust/pull/39793
3981 [39837]: https://github.com/rust-lang/rust/pull/39837
3982 [39843]: https://github.com/rust-lang/rust/pull/39843
3983 [39851]: https://github.com/rust-lang/rust/pull/39851
3984 [39903]: https://github.com/rust-lang/rust/pull/39903
3985 [39939]: https://github.com/rust-lang/rust/pull/39939
3986 [39953]: https://github.com/rust-lang/rust/pull/39953
3987 [39960]: https://github.com/rust-lang/rust/pull/39960
3988 [39990]: https://github.com/rust-lang/rust/pull/39990
3989 [39995]: https://github.com/rust-lang/rust/pull/39995
3990 [40008]: https://github.com/rust-lang/rust/pull/40008
3991 [40009]: https://github.com/rust-lang/rust/pull/40009
3992 [40027]: https://github.com/rust-lang/rust/pull/40027
3993 [40028]: https://github.com/rust-lang/rust/pull/40028
3994 [40037]: https://github.com/rust-lang/rust/pull/40037
3995 [40117]: https://github.com/rust-lang/rust/pull/40117
3996 [40166]: https://github.com/rust-lang/rust/pull/40166
3997 [40245]: https://github.com/rust-lang/rust/pull/40245
3998 [40257]: https://github.com/rust-lang/rust/pull/40257
3999 [40261]: https://github.com/rust-lang/rust/pull/40261
4000 [40265]: https://github.com/rust-lang/rust/pull/40265
4001 [40319]: https://github.com/rust-lang/rust/pull/40319
4002 [40336]: https://github.com/rust-lang/rust/pull/40336
4003 [40526]: https://github.com/rust-lang/rust/pull/40526
4004 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4005 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4006 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4007 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4008 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4009 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4010 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4011 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4012 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4013 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4014 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4015 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4016 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4017 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4018 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4019 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4020 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4021 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4022 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4023 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4024 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4025 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4026 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4027 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4028 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4029 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4030 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4031 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4032 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4033 [mdbook]: https://crates.io/crates/mdbook
4034 [ubook]: https://doc.rust-lang.org/unstable-book/
4037 Version 1.16.0 (2017-03-16)
4038 ===========================
4043 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4044 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4045 match patterns][38069]
4046 * [Clean up semantics of `self` in an import list][38313]
4047 * [`Self` may appear in `impl` headers][38920]
4048 * [`Self` may appear in struct expressions][39282]
4053 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4054 a `.rmeta` file containing only crate metadata][38571]. This can be
4055 used by tools like the Rust Language Service to perform
4056 metadata-only builds.
4057 * [Levenshtein based typo suggestions now work in most places, while
4058 previously they worked only for fields and sometimes for local
4059 variables][38927]. Together with the overhaul of "no
4060 resolution"/"unexpected resolution" errors (#[38154]) they result in
4061 large and systematic improvement in resolution diagnostics.
4062 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4064 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4065 * [`rustc` no longer attempts to provide "consider using an explicit
4066 lifetime" suggestions][37057]. They were inaccurate.
4071 * [`VecDeque::truncate`]
4072 * [`VecDeque::resize`]
4073 * [`String::insert_str`]
4074 * [`Duration::checked_add`]
4075 * [`Duration::checked_sub`]
4076 * [`Duration::checked_div`]
4077 * [`Duration::checked_mul`]
4080 * [`SocketAddr::is_ipv4`]
4081 * [`SocketAddr::is_ipv6`]
4082 * [`IpAddr::is_ipv4`]
4083 * [`IpAddr::is_ipv6`]
4085 * [`Vec::dedup_by_key`]
4086 * [`Result::unwrap_or_default`]
4087 * [`<*const T>::wrapping_offset`]
4088 * [`<*mut T>::wrapping_offset`]
4089 * `CommandExt::creation_flags`
4090 * [`File::set_permissions`]
4091 * [`String::split_off`]
4096 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4097 their argument by `Borrow` parameter][37761]
4098 * [All public types in std implement `Debug`][38006]
4099 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4100 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4101 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4103 * [std: Fix partial writes in `LineWriter`][38062]
4104 * [std: Clamp max read/write sizes on Unix][38062]
4105 * [Use more specific panic message for `&str` slicing errors][38066]
4106 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4107 functionality cannot be achieved in std currently.
4108 * [`writeln!`, like `println!`, now accepts a form with no string
4109 or formatting arguments, to just print a newline][38469]
4110 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4111 * [Reduce the size of static data in `std_unicode::tables`][38781]
4112 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4113 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4115 * [`Duration` implements `Sum`][38712]
4116 * [`String` implements `ToSocketAddrs`][39048]
4121 * [The `cargo check` command does a type check of a project without
4122 building it][cargo/3296]
4123 * [crates.io will display CI badges from Travis and AppVeyor, if
4124 specified in Cargo.toml][cargo/3546]
4125 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4126 * [Compilation profiles accept integer values for `debug`, in addition
4127 to `true` and `false`. These are passed to `rustc` as the value to
4128 `-C debuginfo`][cargo/3534]
4129 * [Implement `cargo --version --verbose`][cargo/3604]
4130 * [All builds now output 'dep-info' build dependencies compatible with
4131 make and ninja][cargo/3557]
4132 * [Build all workspace members with `build --all`][cargo/3511]
4133 * [Document all workspace members with `doc --all`][cargo/3515]
4134 * [Path deps outside workspace are not members][cargo/3443]
4139 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4140 the path to the Rust implementation][38589]
4141 * [The `armv7-linux-androideabi` target no longer enables NEON
4142 extensions, per Google's ABI guide][38413]
4143 * [The stock standard library can be compiled for Redox OS][38401]
4144 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4146 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4148 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4153 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4154 match patterns][38069]
4155 * In this release, references to uninhabited types can not be
4156 pattern-matched. This was accidentally allowed in 1.15.
4157 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4158 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4160 * [Clean up semantics of `self` in an import list][38313]
4161 * Reimplemented lifetime elision. This change was almost entirely compatible
4162 with existing code, but it did close a number of small bugs and loopholes,
4163 as well as being more accepting in some other [cases][41105].
4165 [37057]: https://github.com/rust-lang/rust/pull/37057
4166 [37761]: https://github.com/rust-lang/rust/pull/37761
4167 [38006]: https://github.com/rust-lang/rust/pull/38006
4168 [38051]: https://github.com/rust-lang/rust/pull/38051
4169 [38062]: https://github.com/rust-lang/rust/pull/38062
4170 [38062]: https://github.com/rust-lang/rust/pull/38622
4171 [38066]: https://github.com/rust-lang/rust/pull/38066
4172 [38069]: https://github.com/rust-lang/rust/pull/38069
4173 [38131]: https://github.com/rust-lang/rust/pull/38131
4174 [38154]: https://github.com/rust-lang/rust/pull/38154
4175 [38274]: https://github.com/rust-lang/rust/pull/38274
4176 [38304]: https://github.com/rust-lang/rust/pull/38304
4177 [38313]: https://github.com/rust-lang/rust/pull/38313
4178 [38314]: https://github.com/rust-lang/rust/pull/38314
4179 [38327]: https://github.com/rust-lang/rust/pull/38327
4180 [38401]: https://github.com/rust-lang/rust/pull/38401
4181 [38413]: https://github.com/rust-lang/rust/pull/38413
4182 [38469]: https://github.com/rust-lang/rust/pull/38469
4183 [38559]: https://github.com/rust-lang/rust/pull/38559
4184 [38571]: https://github.com/rust-lang/rust/pull/38571
4185 [38580]: https://github.com/rust-lang/rust/pull/38580
4186 [38589]: https://github.com/rust-lang/rust/pull/38589
4187 [38670]: https://github.com/rust-lang/rust/pull/38670
4188 [38712]: https://github.com/rust-lang/rust/pull/38712
4189 [38726]: https://github.com/rust-lang/rust/pull/38726
4190 [38781]: https://github.com/rust-lang/rust/pull/38781
4191 [38798]: https://github.com/rust-lang/rust/pull/38798
4192 [38909]: https://github.com/rust-lang/rust/pull/38909
4193 [38920]: https://github.com/rust-lang/rust/pull/38920
4194 [38927]: https://github.com/rust-lang/rust/pull/38927
4195 [39048]: https://github.com/rust-lang/rust/pull/39048
4196 [39282]: https://github.com/rust-lang/rust/pull/39282
4197 [39379]: https://github.com/rust-lang/rust/pull/39379
4198 [41105]: https://github.com/rust-lang/rust/issues/41105
4199 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4200 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4201 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4202 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4203 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4204 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4205 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4206 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4207 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4208 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4209 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4210 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4211 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4212 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4213 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4214 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4215 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4216 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4217 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4218 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4219 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4220 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4221 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4222 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4223 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4224 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4225 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4226 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4227 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4228 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4231 Version 1.15.1 (2017-02-09)
4232 ===========================
4234 * [Fix IntoIter::as_mut_slice's signature][39466]
4235 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4237 [39466]: https://github.com/rust-lang/rust/pull/39466
4238 [39523]: https://github.com/rust-lang/rust/pull/39523
4241 Version 1.15.0 (2017-02-02)
4242 ===========================
4247 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4248 stable. This allows popular code-generating crates like Serde and Diesel to
4249 work ergonomically. [RFC 1681].
4250 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4251 with curly braces][36868]. Part of [RFC 1506].
4252 * [A number of minor changes to name resolution have been activated][37127].
4253 They add up to more consistent semantics, allowing for future evolution of
4254 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4255 details of what is different. The breaking changes here have been transitioned
4256 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4257 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4259 * [`?Sized` can be used in `where` clauses][37791]
4260 * [There is now a limit on the size of monomorphized types and it can be
4261 modified with the `#![type_size_limit]` crate attribute, similarly to
4262 the `#![recursion_limit]` attribute][37789]
4267 * [On Windows, the compiler will apply dllimport attributes when linking to
4268 extern functions][37973]. Additional attributes and flags can control which
4269 library kind is linked and its name. [RFC 1717].
4270 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4271 * [The `--test` flag works with procedural macro crates][38107]
4272 * [Fix `extern "aapcs" fn` ABI][37814]
4273 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4274 * [The `format!` expander recognizes incorrect `printf` and shell-style
4275 formatting directives and suggests the correct format][37613].
4276 * [Only report one error for all unused imports in an import list][37456]
4278 Compiler Performance
4279 --------------------
4281 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4282 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4283 * [Don't clone in `UnificationTable::probe`][37848]
4284 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4285 * [Use small vectors in type walker][37760]
4286 * [Macro expansion performance was improved][37701]
4287 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4288 * [Replace FNV with a faster hash function][37229]
4293 * [`std::iter::Iterator::min_by`]
4294 * [`std::iter::Iterator::max_by`]
4295 * [`std::os::*::fs::FileExt`]
4296 * [`std::sync::atomic::Atomic*::get_mut`]
4297 * [`std::sync::atomic::Atomic*::into_inner`]
4298 * [`std::vec::IntoIter::as_slice`]
4299 * [`std::vec::IntoIter::as_mut_slice`]
4300 * [`std::sync::mpsc::Receiver::try_iter`]
4301 * [`std::os::unix::process::CommandExt::before_exec`]
4302 * [`std::rc::Rc::strong_count`]
4303 * [`std::rc::Rc::weak_count`]
4304 * [`std::sync::Arc::strong_count`]
4305 * [`std::sync::Arc::weak_count`]
4306 * [`std::char::encode_utf8`]
4307 * [`std::char::encode_utf16`]
4308 * [`std::cell::Ref::clone`]
4309 * [`std::io::Take::into_inner`]
4314 * [The standard sorting algorithm has been rewritten for dramatic performance
4315 improvements][38192]. It is a hybrid merge sort, drawing influences from
4316 Timsort. Previously it was a naive merge sort.
4317 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4318 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4320 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4321 and `char_indices().last()`][37882]
4322 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4323 * [Chinese characters display correctly in `fmt::Debug`][37855]
4324 * [Derive `Default` for `Duration`][37699]
4325 * [Support creation of anonymous pipes on WinXP/2k][37677]
4326 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4327 * [Don't pass overlapped handles to processes][38835]
4332 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4333 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4334 should instead check the variable at runtime with `std::env`. That the value
4335 was set at build time was a bug, and incorrect when cross-compiling. This
4336 change is known to cause breakage.
4337 * [Add `--all` flag to `cargo test`][cargo/3221]
4338 * [Compile statically against the MSVC CRT][cargo/3363]
4339 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4340 * [Link OpenSSL statically on OSX][cargo/3311]
4341 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4342 * [Test for bad path overrides with summaries][cargo/3336]
4343 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4344 * [Fix retrying crate downloads for network errors][cargo/3348]
4345 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4346 * [Emit more info on --message-format=json][cargo/3319]
4347 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4348 * [Don't ignore errors in workspace manifest][cargo/3409]
4349 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4354 * [Test runners (binaries built with `--test`) now support a `--list` argument
4355 that lists the tests it contains][38185]
4356 * [Test runners now support a `--exact` argument that makes the test filter
4357 match exactly, instead of matching only a substring of the test name][38181]
4358 * [rustdoc supports a `--playground-url` flag][37763]
4359 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4364 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4365 continue to be used in this release by passing `--disable-rustbuild` to the
4366 configure script, but they will be deleted soon. Note that the new build
4367 system uses a different on-disk layout that will likely affect any scripts
4369 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4371 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4372 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4378 * [A number of minor changes to name resolution have been activated][37127].
4379 They add up to more consistent semantics, allowing for future evolution of
4380 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4381 details of what is different. The breaking changes here have been transitioned
4382 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4383 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4384 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4385 should instead check the variable at runtime with `std::env`. That the value
4386 was set at build time was a bug, and incorrect when cross-compiling. This
4387 change is known to cause breakage.
4388 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4389 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4390 1.10 and is now an error by default. It will become a hard error in the near
4392 * [The semantics relating modules to file system directories are changing in
4393 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4394 lint, which is a warning in this release, and will become a hard error in the
4396 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4397 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4398 the underlying iterator][37834]
4400 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4401 [33685]: https://github.com/rust-lang/rust/issues/33685
4402 [36868]: https://github.com/rust-lang/rust/pull/36868
4403 [37127]: https://github.com/rust-lang/rust/pull/37127
4404 [37229]: https://github.com/rust-lang/rust/pull/37229
4405 [37456]: https://github.com/rust-lang/rust/pull/37456
4406 [37527]: https://github.com/rust-lang/rust/pull/37527
4407 [37602]: https://github.com/rust-lang/rust/pull/37602
4408 [37613]: https://github.com/rust-lang/rust/pull/37613
4409 [37615]: https://github.com/rust-lang/rust/pull/37615
4410 [37636]: https://github.com/rust-lang/rust/pull/37636
4411 [37627]: https://github.com/rust-lang/rust/pull/37627
4412 [37642]: https://github.com/rust-lang/rust/pull/37642
4413 [37677]: https://github.com/rust-lang/rust/pull/37677
4414 [37699]: https://github.com/rust-lang/rust/pull/37699
4415 [37701]: https://github.com/rust-lang/rust/pull/37701
4416 [37705]: https://github.com/rust-lang/rust/pull/37705
4417 [37749]: https://github.com/rust-lang/rust/pull/37749
4418 [37760]: https://github.com/rust-lang/rust/pull/37760
4419 [37763]: https://github.com/rust-lang/rust/pull/37763
4420 [37764]: https://github.com/rust-lang/rust/pull/37764
4421 [37789]: https://github.com/rust-lang/rust/pull/37789
4422 [37791]: https://github.com/rust-lang/rust/pull/37791
4423 [37814]: https://github.com/rust-lang/rust/pull/37814
4424 [37817]: https://github.com/rust-lang/rust/pull/37817
4425 [37834]: https://github.com/rust-lang/rust/pull/37834
4426 [37848]: https://github.com/rust-lang/rust/pull/37848
4427 [37855]: https://github.com/rust-lang/rust/pull/37855
4428 [37882]: https://github.com/rust-lang/rust/pull/37882
4429 [37888]: https://github.com/rust-lang/rust/pull/37888
4430 [37973]: https://github.com/rust-lang/rust/pull/37973
4431 [37979]: https://github.com/rust-lang/rust/pull/37979
4432 [38086]: https://github.com/rust-lang/rust/pull/38086
4433 [38107]: https://github.com/rust-lang/rust/pull/38107
4434 [38117]: https://github.com/rust-lang/rust/pull/38117
4435 [38134]: https://github.com/rust-lang/rust/pull/38134
4436 [38146]: https://github.com/rust-lang/rust/pull/38146
4437 [38181]: https://github.com/rust-lang/rust/pull/38181
4438 [38182]: https://github.com/rust-lang/rust/pull/38182
4439 [38185]: https://github.com/rust-lang/rust/pull/38185
4440 [38192]: https://github.com/rust-lang/rust/pull/38192
4441 [38279]: https://github.com/rust-lang/rust/pull/38279
4442 [38835]: https://github.com/rust-lang/rust/pull/38835
4443 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4444 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4445 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4446 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4447 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4448 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4449 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4450 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4451 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4452 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4453 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4454 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4455 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4456 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4457 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4458 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4459 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4460 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4461 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4462 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4463 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4464 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4465 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4466 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4467 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4468 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4469 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4470 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4471 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4472 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4473 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4474 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4475 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4476 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4477 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4478 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4479 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4480 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4483 Version 1.14.0 (2016-12-22)
4484 ===========================
4489 * [`..` matches multiple tuple fields in enum variants, structs
4490 and tuples][36843]. [RFC 1492].
4491 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4492 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4493 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4494 dereferencing][36822]
4499 * [Mark enums with non-zero discriminant as non-zero][37224]
4500 * [Lower-case `static mut` names are linted like other
4501 statics and consts][37162]
4502 * [Fix ICE on some macros in const integer positions
4503 (e.g. `[u8; m!()]`)][36819]
4504 * [Improve error message and snippet for "did you mean `x`"][36798]
4505 * [Add a panic-strategy field to the target specification][36794]
4506 * [Include LLVM version in `--version --verbose`][37200]
4508 Compile-time Optimizations
4509 --------------------------
4511 * [Improve macro expansion performance][37569]
4512 * [Shrink `Expr_::ExprInlineAsm`][37445]
4513 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4514 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4515 * [Avoid more allocations when compiling html5ever][37373]
4516 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4517 * [Avoid some allocations in the macro parser][37318]
4518 * [Use a faster deflate setting][37298]
4519 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4520 during interning of slices][37270]
4521 * [Optimize `write_metadata`][37267]
4522 * [Don't process obligation forest cycles when stalled][37231]
4523 * [Avoid many `CrateConfig` clones][37161]
4524 * [Optimize `Substs::super_fold_with`][37108]
4525 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4526 * [Speed up `plug_leaks`][36917]
4531 * [`println!()`, with no arguments, prints newline][36825].
4532 Previously, an empty string was required to achieve the same.
4533 * [`Wrapping` impls standard binary and unary operators, as well as
4534 the `Sum` and `Product` iterators][37356]
4535 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4537 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4538 `VecDeque` iterators][37315]
4539 * [Improve `SipHasher` performance on small values][37312]
4540 * [Add Iterator trait TrustedLen to enable better FromIterator /
4542 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4543 * [`ReadDir` implements `Debug`][37221]
4544 * [Implement `RefUnwindSafe` for atomic types][37178]
4545 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4546 * [Avoid allocations in `Decoder::read_str`][37064]
4547 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4548 * [Impl `Debug` for raw pointers to unsized data][36880]
4549 * [Don't reuse `HashMap` random seeds][37470]
4550 * [The internal memory layout of `HashMap` is more cache-friendly, for
4551 significant improvements in some operations][36692]
4552 * [`HashMap` uses less memory on 32-bit architectures][36595]
4553 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4558 * [Expose rustc cfg values to build scripts][cargo/3243]
4559 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4560 * [Fix passing --features when testing multiple packages][cargo/3280]
4561 * [Use a single profile set per workspace][cargo/3249]
4562 * [Load `replace` sections from lock files][cargo/3220]
4563 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4568 * [rustup is the recommended Rust installation method][1.14rustup]
4569 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4570 S390x. These are [tier 2] platforms and may have major defects. Follow the
4571 instructions on the website to install, or add the targets to an existing
4572 installation with `rustup target add`. The new target triples are:
4573 - `mips-unknown-linux-gnu`
4574 - `mipsel-unknown-linux-gnu`
4575 - `mips64-unknown-linux-gnuabi64`
4576 - `mips64el-unknown-linux-gnuabi64 `
4577 - `powerpc-unknown-linux-gnu`
4578 - `powerpc64-unknown-linux-gnu`
4579 - `powerpc64le-unknown-linux-gnu`
4580 - `s390x-unknown-linux-gnu `
4581 * This release includes target (std) builds for ARM Linux running MUSL
4582 libc. These are [tier 2] platforms and may have major defects. Add the
4583 following triples to an existing rustup installation with `rustup target add`:
4584 - `arm-unknown-linux-musleabi`
4585 - `arm-unknown-linux-musleabihf`
4586 - `armv7-unknown-linux-musleabihf`
4587 * This release includes [experimental support for WebAssembly][1.14wasm], via
4588 the `wasm32-unknown-emscripten` target. This target is known to have major
4589 defects. Please test, report, and fix.
4590 * rustup no longer installs documentation by default. Run `rustup
4591 component add rust-docs` to install.
4592 * [Fix line stepping in debugger][37310]
4593 * [Enable line number debuginfo in releases][37280]
4598 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4599 * [Add support for Fuchsia OS][37313]
4600 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4605 * [A number of forward-compatibility lints used by the compiler
4606 to gradually introduce language changes have been converted
4607 to deny by default][36894]:
4608 - ["use of inaccessible extern crate erroneously allowed"][36886]
4609 - ["type parameter default erroneously allowed in invalid location"][36887]
4610 - ["detects super or self keywords at the beginning of global path"][36888]
4611 - ["two overlapping inherent impls define an item with the same name
4612 were erroneously allowed"][36889]
4613 - ["floating-point constants cannot be used in patterns"][36890]
4614 - ["constants of struct or enum type can only be used in a pattern if
4615 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4616 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4617 * [Prohibit patterns in trait methods without bodies][37378]
4618 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4619 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4620 * [The `$crate` macro variable is accepted in fewer locations][37213]
4621 * [Impls specifying extra region requirements beyond the trait
4622 they implement are rejected][37167]
4623 * [Enums may not be unsized][37111]. Unsized enums are intended to
4624 work but never have. For now they are forbidden.
4625 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4627 [tier 2]: https://forge.rust-lang.org/platform-support.html
4628 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4629 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4630 [36430]: https://github.com/rust-lang/rust/pull/36430
4631 [36595]: https://github.com/rust-lang/rust/pull/36595
4632 [36595]: https://github.com/rust-lang/rust/pull/36595
4633 [36692]: https://github.com/rust-lang/rust/pull/36692
4634 [36767]: https://github.com/rust-lang/rust/pull/36767
4635 [36794]: https://github.com/rust-lang/rust/pull/36794
4636 [36798]: https://github.com/rust-lang/rust/pull/36798
4637 [36819]: https://github.com/rust-lang/rust/pull/36819
4638 [36822]: https://github.com/rust-lang/rust/pull/36822
4639 [36825]: https://github.com/rust-lang/rust/pull/36825
4640 [36843]: https://github.com/rust-lang/rust/pull/36843
4641 [36880]: https://github.com/rust-lang/rust/pull/36880
4642 [36886]: https://github.com/rust-lang/rust/issues/36886
4643 [36887]: https://github.com/rust-lang/rust/issues/36887
4644 [36888]: https://github.com/rust-lang/rust/issues/36888
4645 [36889]: https://github.com/rust-lang/rust/issues/36889
4646 [36890]: https://github.com/rust-lang/rust/issues/36890
4647 [36891]: https://github.com/rust-lang/rust/issues/36891
4648 [36892]: https://github.com/rust-lang/rust/issues/36892
4649 [36894]: https://github.com/rust-lang/rust/pull/36894
4650 [36917]: https://github.com/rust-lang/rust/pull/36917
4651 [36993]: https://github.com/rust-lang/rust/pull/36993
4652 [37037]: https://github.com/rust-lang/rust/pull/37037
4653 [37064]: https://github.com/rust-lang/rust/pull/37064
4654 [37094]: https://github.com/rust-lang/rust/pull/37094
4655 [37108]: https://github.com/rust-lang/rust/pull/37108
4656 [37111]: https://github.com/rust-lang/rust/pull/37111
4657 [37161]: https://github.com/rust-lang/rust/pull/37161
4658 [37162]: https://github.com/rust-lang/rust/pull/37162
4659 [37167]: https://github.com/rust-lang/rust/pull/37167
4660 [37178]: https://github.com/rust-lang/rust/pull/37178
4661 [37200]: https://github.com/rust-lang/rust/pull/37200
4662 [37213]: https://github.com/rust-lang/rust/pull/37213
4663 [37221]: https://github.com/rust-lang/rust/pull/37221
4664 [37224]: https://github.com/rust-lang/rust/pull/37224
4665 [37230]: https://github.com/rust-lang/rust/pull/37230
4666 [37231]: https://github.com/rust-lang/rust/pull/37231
4667 [37247]: https://github.com/rust-lang/rust/pull/37247
4668 [37267]: https://github.com/rust-lang/rust/pull/37267
4669 [37270]: https://github.com/rust-lang/rust/pull/37270
4670 [37273]: https://github.com/rust-lang/rust/pull/37273
4671 [37280]: https://github.com/rust-lang/rust/pull/37280
4672 [37298]: https://github.com/rust-lang/rust/pull/37298
4673 [37306]: https://github.com/rust-lang/rust/pull/37306
4674 [37310]: https://github.com/rust-lang/rust/pull/37310
4675 [37312]: https://github.com/rust-lang/rust/pull/37312
4676 [37313]: https://github.com/rust-lang/rust/pull/37313
4677 [37315]: https://github.com/rust-lang/rust/pull/37315
4678 [37318]: https://github.com/rust-lang/rust/pull/37318
4679 [37322]: https://github.com/rust-lang/rust/pull/37322
4680 [37326]: https://github.com/rust-lang/rust/pull/37326
4681 [37351]: https://github.com/rust-lang/rust/pull/37351
4682 [37356]: https://github.com/rust-lang/rust/pull/37356
4683 [37367]: https://github.com/rust-lang/rust/pull/37367
4684 [37373]: https://github.com/rust-lang/rust/pull/37373
4685 [37378]: https://github.com/rust-lang/rust/pull/37378
4686 [37389]: https://github.com/rust-lang/rust/pull/37389
4687 [37392]: https://github.com/rust-lang/rust/pull/37392
4688 [37427]: https://github.com/rust-lang/rust/pull/37427
4689 [37439]: https://github.com/rust-lang/rust/pull/37439
4690 [37445]: https://github.com/rust-lang/rust/pull/37445
4691 [37470]: https://github.com/rust-lang/rust/pull/37470
4692 [37569]: https://github.com/rust-lang/rust/pull/37569
4693 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4694 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4695 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4696 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4697 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4698 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4699 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4702 Version 1.13.0 (2016-11-10)
4703 ===========================
4708 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4709 errors, like the `try!` macro, described in [RFC 0243].
4710 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4711 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4712 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4713 * [Fix lifetime rules for 'if' conditions][36029]
4714 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4719 * [Add the `-C link-arg` argument][36574]
4720 * [Remove the old AST-based backend from rustc_trans][35764]
4721 * [Don't enable NEON by default on armv7 Linux][35814]
4722 * [Fix debug line number info for macro expansions][35238]
4723 * [Do not emit "class method" debuginfo for types that are not
4724 DICompositeType][36008]
4725 * [Warn about multiple conflicting #[repr] hints][34623]
4726 * [When sizing DST, don't double-count nested struct prefixes][36351]
4727 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4728 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4729 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4730 * [Expand macros without recursing to avoid stack overflows][36214]
4735 * [Replace macro backtraces with labeled local uses][35702]
4736 * [Improve error message for misplaced doc comments][33922]
4737 * [Buffer unix and lock windows to prevent message interleaving][35975]
4738 * [Update lifetime errors to specifically note temporaries][36171]
4739 * [Special case a few colors for Windows][36178]
4740 * [Suggest `use self` when such an import resolves][36289]
4741 * [Be more specific when type parameter shadows primitive type][36338]
4742 * Many minor improvements
4744 Compile-time Optimizations
4745 --------------------------
4747 * [Compute and cache HIR hashes at beginning][35854]
4748 * [Don't hash types in loan paths][36004]
4749 * [Cache projections in trans][35761]
4750 * [Optimize the parser's last token handling][36527]
4751 * [Only instantiate #[inline] functions in codegen units referencing
4752 them][36524]. This leads to big improvements in cases where crates export
4753 define many inline functions without using them directly.
4754 * [Lazily allocate TypedArena's first chunk][36592]
4755 * [Don't allocate during default HashSet creation][36734]
4762 * [`overflowing_abs`]
4763 * [`RefCell::try_borrow`]
4764 * [`RefCell::try_borrow_mut`]
4769 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4770 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4772 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4773 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4774 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4775 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4776 * [Use arc4rand on FreeBSD][35884]
4777 * [memrchr: Correct aligned offset computation][35969]
4778 * [Improve Demangling of Rust Symbols][36059]
4779 * [Use monotonic time in condition variables][35048]
4780 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4781 * [Implement conversion traits for `char`][35755]
4782 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4783 * [Zero first byte of CString on drop][36264]
4784 * [Inherit overflow checks for sum and product][36372]
4785 * [Add missing Eq implementations][36423]
4786 * [Implement `Debug` for `DirEntry`][36631]
4787 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4789 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4790 * [Implement more traits for `std::io::ErrorKind`][35911]
4791 * [Optimize BinaryHeap bounds checking][36072]
4792 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4793 `extend_with_element`][36355]
4794 * [Fix overflow checking in unsigned pow()][34942]
4799 * This release includes security fixes to both curl and OpenSSL.
4800 * [Fix transitive doctests when panic=abort][cargo/3021]
4801 * [Add --all-features flag to cargo][cargo/3038]
4802 * [Reject path-based dependencies in `cargo package`][cargo/3060]
4803 * [Don't parse the home directory more than once][cargo/3078]
4804 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4805 * [Update OpenSSL to 1.0.2j][cargo/3121]
4806 * [Add license and license_file to cargo metadata output][cargo/3110]
4807 * [Make crates-io registry URL optional in config; ignore all changes to
4808 source.crates-io][cargo/3089]
4809 * [Don't download dependencies from other platforms][cargo/3123]
4810 * [Build transitive dev-dependencies when needed][cargo/3125]
4811 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
4812 * [Avoid updating registry when adding existing deps][cargo/3144]
4813 * [Warn about path overrides that won't work][cargo/3136]
4814 * [Use workspaces during `cargo install`][cargo/3146]
4815 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
4816 * [Add --message-format flag][cargo/3000]
4817 * [Pass target environment for rustdoc][cargo/3205]
4818 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
4819 * [Update curl and curl-sys][cargo/3241]
4820 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
4825 * [rustdoc: Add the `--sysroot` argument][36586]
4826 * [rustdoc: Fix a couple of issues with the search results][35655]
4827 * [rustdoc: remove the `!` from macro URLs and titles][35234]
4828 * [gdb: Fix pretty-printing special-cased Rust types][35585]
4829 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
4834 * [Remove unmaintained style guide][35124]
4835 * [Add s390x support][36369]
4836 * [Initial work at Haiku OS support][36727]
4837 * [Add mips-uclibc targets][35734]
4838 * [Crate-ify compiler-rt into compiler-builtins][35021]
4839 * [Add rustc version info (git hash + date) to dist tarball][36213]
4840 * Many documentation improvements
4845 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4846 * [Deny (by default) transmuting from fn item types to pointer-sized
4847 types][34923]. Continuing the long transition to zero-sized fn items,
4849 * [Fix `#[derive]` for empty tuple structs/variants][35728].
4851 * [Issue deprecation warnings for safe accesses to extern statics][36173]
4852 * [Fix lifetime rules for 'if' conditions][36029].
4853 * [Inherit overflow checks for sum and product][36372].
4854 * [Forbid user-defined macros named "macro_rules"][36730].
4856 [33922]: https://github.com/rust-lang/rust/pull/33922
4857 [34623]: https://github.com/rust-lang/rust/pull/34623
4858 [34923]: https://github.com/rust-lang/rust/pull/34923
4859 [34942]: https://github.com/rust-lang/rust/pull/34942
4860 [34982]: https://github.com/rust-lang/rust/pull/34982
4861 [35021]: https://github.com/rust-lang/rust/pull/35021
4862 [35048]: https://github.com/rust-lang/rust/pull/35048
4863 [35074]: https://github.com/rust-lang/rust/pull/35074
4864 [35124]: https://github.com/rust-lang/rust/pull/35124
4865 [35234]: https://github.com/rust-lang/rust/pull/35234
4866 [35238]: https://github.com/rust-lang/rust/pull/35238
4867 [35354]: https://github.com/rust-lang/rust/pull/35354
4868 [35559]: https://github.com/rust-lang/rust/pull/35559
4869 [35585]: https://github.com/rust-lang/rust/pull/35585
4870 [35627]: https://github.com/rust-lang/rust/pull/35627
4871 [35655]: https://github.com/rust-lang/rust/pull/35655
4872 [35702]: https://github.com/rust-lang/rust/pull/35702
4873 [35707]: https://github.com/rust-lang/rust/pull/35707
4874 [35728]: https://github.com/rust-lang/rust/pull/35728
4875 [35734]: https://github.com/rust-lang/rust/pull/35734
4876 [35755]: https://github.com/rust-lang/rust/pull/35755
4877 [35761]: https://github.com/rust-lang/rust/pull/35761
4878 [35764]: https://github.com/rust-lang/rust/pull/35764
4879 [35814]: https://github.com/rust-lang/rust/pull/35814
4880 [35854]: https://github.com/rust-lang/rust/pull/35854
4881 [35871]: https://github.com/rust-lang/rust/pull/35871
4882 [35884]: https://github.com/rust-lang/rust/pull/35884
4883 [35911]: https://github.com/rust-lang/rust/pull/35911
4884 [35969]: https://github.com/rust-lang/rust/pull/35969
4885 [35975]: https://github.com/rust-lang/rust/pull/35975
4886 [36004]: https://github.com/rust-lang/rust/pull/36004
4887 [36008]: https://github.com/rust-lang/rust/pull/36008
4888 [36014]: https://github.com/rust-lang/rust/pull/36014
4889 [36029]: https://github.com/rust-lang/rust/pull/36029
4890 [36059]: https://github.com/rust-lang/rust/pull/36059
4891 [36072]: https://github.com/rust-lang/rust/pull/36072
4892 [36101]: https://github.com/rust-lang/rust/pull/36101
4893 [36104]: https://github.com/rust-lang/rust/pull/36104
4894 [36171]: https://github.com/rust-lang/rust/pull/36171
4895 [36173]: https://github.com/rust-lang/rust/pull/36173
4896 [36178]: https://github.com/rust-lang/rust/pull/36178
4897 [36213]: https://github.com/rust-lang/rust/pull/36213
4898 [36214]: https://github.com/rust-lang/rust/pull/36214
4899 [36264]: https://github.com/rust-lang/rust/pull/36264
4900 [36266]: https://github.com/rust-lang/rust/pull/36266
4901 [36289]: https://github.com/rust-lang/rust/pull/36289
4902 [36338]: https://github.com/rust-lang/rust/pull/36338
4903 [36351]: https://github.com/rust-lang/rust/pull/36351
4904 [36355]: https://github.com/rust-lang/rust/pull/36355
4905 [36369]: https://github.com/rust-lang/rust/pull/36369
4906 [36372]: https://github.com/rust-lang/rust/pull/36372
4907 [36423]: https://github.com/rust-lang/rust/pull/36423
4908 [36482]: https://github.com/rust-lang/rust/pull/36482
4909 [36505]: https://github.com/rust-lang/rust/pull/36505
4910 [36524]: https://github.com/rust-lang/rust/pull/36524
4911 [36527]: https://github.com/rust-lang/rust/pull/36527
4912 [36551]: https://github.com/rust-lang/rust/pull/36551
4913 [36574]: https://github.com/rust-lang/rust/pull/36574
4914 [36586]: https://github.com/rust-lang/rust/pull/36586
4915 [36592]: https://github.com/rust-lang/rust/pull/36592
4916 [36631]: https://github.com/rust-lang/rust/pull/36631
4917 [36639]: https://github.com/rust-lang/rust/pull/36639
4918 [36721]: https://github.com/rust-lang/rust/pull/36721
4919 [36727]: https://github.com/rust-lang/rust/pull/36727
4920 [36730]: https://github.com/rust-lang/rust/pull/36730
4921 [36734]: https://github.com/rust-lang/rust/pull/36734
4922 [36754]: https://github.com/rust-lang/rust/pull/36754
4923 [36995]: https://github.com/rust-lang/rust/pull/36995
4924 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
4925 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
4926 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4927 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
4928 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
4929 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
4930 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
4931 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
4932 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
4933 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
4934 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
4935 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
4936 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
4937 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
4938 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
4939 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
4940 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
4941 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
4942 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
4943 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
4944 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
4945 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
4946 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
4947 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
4948 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
4949 [rustup]: https://www.rustup.rs
4950 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
4951 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
4952 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
4953 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
4954 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
4955 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
4956 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
4959 Version 1.12.1 (2016-10-20)
4960 ===========================
4965 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
4966 * [Confusion with double negation and booleans][36856]
4967 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
4968 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
4969 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
4970 * [Corrupted memory after updated to 1.12][36936]
4971 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
4972 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
4973 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
4975 [36381]: https://github.com/rust-lang/rust/issues/36381
4976 [36856]: https://github.com/rust-lang/rust/issues/36856
4977 [36875]: https://github.com/rust-lang/rust/issues/36875
4978 [36924]: https://github.com/rust-lang/rust/issues/36924
4979 [36926]: https://github.com/rust-lang/rust/issues/36926
4980 [36936]: https://github.com/rust-lang/rust/issues/36936
4981 [37026]: https://github.com/rust-lang/rust/issues/37026
4982 [37112]: https://github.com/rust-lang/rust/issues/37112
4983 [37153]: https://github.com/rust-lang/rust/issues/37153
4986 Version 1.12.0 (2016-09-29)
4987 ===========================
4992 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4993 This translation pass is far simpler than the previous AST->LLVM pass, and
4994 creates opportunities to perform new optimizations directly on the MIR. It
4995 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4996 * [`rustc` presents a new, more readable error format, along with
4997 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4998 Most common editors supporting Rust have been updated to work with it. It was
4999 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5004 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5005 This translation pass is far simpler than the previous AST->LLVM pass, and
5006 creates opportunities to perform new optimizations directly on the MIR. It
5007 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5008 * [Print the Rust target name, not the LLVM target name, with
5009 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5010 * [The computation of `TypeId` is correct in some cases where it was previously
5011 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5012 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5013 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5014 `--print relocation-models`, and `--print code-models` print the available
5015 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5016 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5017 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5018 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5019 These targets produce statically-linked binaries. There are no binary release
5025 * [`rustc` presents a new, more readable error format, along with
5026 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5027 Most common editors supporting Rust have been updated to work with it. It was
5028 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5029 * [In error descriptions, references are now described in plain English,
5030 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5031 * [In error type descriptions, unknown numeric types are named `{integer}` or
5032 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5033 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5038 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5039 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5040 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5041 useful](https://github.com/rust-lang/rust/pull/34908)
5042 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5043 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5044 * [Semicolons are properly required as statement delimiters inside
5045 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5046 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5051 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5052 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5053 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5054 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5055 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5056 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5057 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5058 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5059 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5060 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5061 Both on Unix and Windows.
5062 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5063 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5064 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5065 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5066 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5067 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5068 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5069 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5074 * [The `format!` macro and friends now allow a single argument to be formatted
5075 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5076 * [The lifetime bounds on `[T]::binary_search_by` and
5077 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5078 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5079 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5080 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5081 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5082 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5083 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5084 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5085 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5086 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5087 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5088 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5089 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5090 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5091 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5092 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5093 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5094 * [`mpsc::sync_channel` `Receiver`s return any available message before
5095 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5096 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5097 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5102 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5103 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5104 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5105 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5106 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5107 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5108 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5109 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5110 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5111 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5112 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5113 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5114 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5115 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5116 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5117 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5122 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5123 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5128 * [Test binaries now support a `--test-threads` argument to specify the number
5129 of threads used to run tests, and which acts the same as the
5130 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5131 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5132 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5133 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5134 * [Rust releases now come with source packages that can be installed by rustup
5135 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5136 The resulting source code can be used by tools and IDES, located in the
5137 sysroot under `lib/rustlib/src`.
5142 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5143 * Many minor improvements to the documentation.
5144 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5149 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5150 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5151 * [When formatting strings, if "precision" is specified, the "fill",
5152 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5153 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5156 Version 1.11.0 (2016-08-18)
5157 ===========================
5162 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5163 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5164 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5165 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5170 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5171 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5172 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5173 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5174 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5175 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5176 (in libcore - previously stabilized in libstd)
5177 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5178 (in libcore - previously stabilized in libstd)
5179 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5180 (in libcore - previously stabilized in libstd)
5181 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5182 (in libcore - previously stabilized in libstd)
5183 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5184 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5185 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5186 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5191 * [The `thread_local!` macro supports multiple definitions in a single
5192 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5193 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5194 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5195 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5196 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5197 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5198 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5199 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5204 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5205 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5206 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5207 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5208 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5209 and `-vv` prints warnings for all crates.
5210 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5211 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5212 This provides room for expansion by arbitrary tools.
5213 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5214 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5215 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5216 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5217 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5218 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5219 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5224 * [Caching projections speeds up type check dramatically for some
5225 workloads](https://github.com/rust-lang/rust/pull/33816)
5226 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5227 This hasher is faster, but is believed to provide sufficient
5228 protection from collision attacks.
5229 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5234 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5235 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5236 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5237 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5238 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5243 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5244 * [When emitting debug info, rustc emits frame pointers for closures,
5245 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5246 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5247 * Many more errors have been given error codes and extended
5249 * API documentation continues to be improved, with many new examples
5254 * [rustc no longer hangs when dependencies recursively re-export
5255 submodules](https://github.com/rust-lang/rust/pull/34542)
5256 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5257 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5258 rewritten](https://github.com/rust-lang/rust/pull/33895)
5259 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5260 No targets use this yet, but it works toward AVR support.
5265 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5266 * [The new follow-set rules that place restrictions on `macro_rules!`
5267 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5268 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5269 and has been a warning since 1.10.
5270 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5271 This causes breakage in some corner cases.
5274 Version 1.10.0 (2016-07-07)
5275 ===========================
5280 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5281 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5282 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5283 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5284 * [`panic!` can be converted to a runtime abort with the
5285 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5286 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5287 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5288 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5289 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5290 Note that Cargo does not yet directly support cdylibs.
5295 * `os::windows::fs::OpenOptionsExt::access_mode`
5296 * `os::windows::fs::OpenOptionsExt::share_mode`
5297 * `os::windows::fs::OpenOptionsExt::custom_flags`
5298 * `os::windows::fs::OpenOptionsExt::attributes`
5299 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5300 * `os::unix::fs::OpenOptionsExt::custom_flags`
5301 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5302 * `Default for sync::Weak`
5303 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5304 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5305 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5306 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5307 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5308 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5309 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5310 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5311 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5312 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5313 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5314 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5315 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5316 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5317 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5318 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5319 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5320 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5321 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5322 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5323 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5324 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5325 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5326 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5327 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5328 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5329 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5330 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5331 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5332 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5333 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5334 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5335 * Read/Write/RawFd impls for `UnixStream`
5336 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5337 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5338 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5339 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5340 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5341 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5342 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5343 * RawFd impls for `UnixListener`
5344 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5345 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5346 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5347 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5348 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5349 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5350 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5351 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5352 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5353 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5354 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5355 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5356 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5357 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5358 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5359 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5360 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5361 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5362 * RawFd impls for `UnixDatagram`
5363 * `{BTree,Hash}Map::values_mut`
5364 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5369 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5370 The semantics of this minor method are subtle and probably not what
5372 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5373 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5374 will fall back to `/dev/urandom` temporarily to avoid blocking
5375 during early boot](https://github.com/rust-lang/rust/pull/33086).
5376 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5377 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5378 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5379 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5380 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5381 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5382 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5386 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5387 This controls the runtime behavior of the `panic!` macro
5388 and can be either "unwind" (the default), or "abort".
5389 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5390 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5391 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5392 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5393 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5394 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5395 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5396 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5397 By default they are retried twice, which can be customized with the
5398 `net.retry` value in `.cargo/config`.
5399 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5400 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5401 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5402 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5403 Makes it possible to install multiple crates in parallel.
5404 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5405 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5406 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5407 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5408 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5409 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5414 * [rustc memory usage was reduced by refactoring the context used for
5415 type checking](https://github.com/rust-lang/rust/pull/33425).
5416 * [Speed up creation of `HashMap`s by caching the random keys used
5417 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5418 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5419 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5420 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5421 10x faster than the previous lookup tables.
5422 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5427 * Many incremental improvements to documentation and rustdoc.
5428 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5429 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5430 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5431 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5432 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5433 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5434 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5439 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5440 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5441 * [`std` no longer prints backtraces on platforms where the running
5442 module must be loaded with `env::current_exe`, which can't be relied
5443 on](https://github.com/rust-lang/rust/pull/33554).
5444 * This release includes std binaries for the i586-unknown-linux-gnu,
5445 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5446 i586 target is for old x86 hardware without SSE2, and the armv7
5447 target is for Android running on modern ARM architectures.
5448 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5449 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5450 * [On Unix the runtime aborts by calling `libc::abort` instead of
5451 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5452 * [Rust is now bootstrapped from the previous release of Rust,
5453 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5458 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5459 * [`target_env` for Linux ARM targets is just `gnu`, not
5460 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5461 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5462 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5463 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5464 Affects how macros are parsed.
5465 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5466 * [Feature-gated attributes on macro-generated macro invocations are
5467 now rejected](https://github.com/rust-lang/rust/pull/32791).
5468 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5469 This caused some minor changes to type inference.
5472 Version 1.9.0 (2016-05-26)
5473 ==========================
5478 * The `#[deprecated]` attribute when applied to an API will generate
5479 warnings when used. The warnings may be suppressed with
5480 `#[allow(deprecated)]`. [RFC 1270].
5481 * [`fn` item types are zero sized, and each `fn` names a unique
5482 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5483 `transmute` on a `fn` type will generate a warning for a few cycles,
5484 then will be converted to an error.
5485 * [Field and method resolution understand visibility, so private
5486 fields and methods cannot prevent the proper use of public fields
5487 and methods][1.9fv].
5488 * [The parser considers unicode codepoints in the
5489 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5495 * [`std::panic::catch_unwind`] (renamed from `recover`)
5496 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5497 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5498 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5499 * [`str::is_char_boundary`]
5500 * [`<*const T>::as_ref`]
5501 * [`<*mut T>::as_ref`]
5502 * [`<*mut T>::as_mut`]
5503 * [`AsciiExt::make_ascii_uppercase`]
5504 * [`AsciiExt::make_ascii_lowercase`]
5505 * [`char::decode_utf16`]
5506 * [`char::DecodeUtf16`]
5507 * [`char::DecodeUtf16Error`]
5508 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5509 * [`BTreeSet::take`]
5510 * [`BTreeSet::replace`]
5513 * [`HashSet::replace`]
5515 * [`OsString::with_capacity`]
5516 * [`OsString::clear`]
5517 * [`OsString::capacity`]
5518 * [`OsString::reserve`]
5519 * [`OsString::reserve_exact`]
5520 * [`OsStr::is_empty`]
5522 * [`std::os::unix::thread`]
5525 * [`JoinHandleExt::as_pthread_t`]
5526 * [`JoinHandleExt::into_pthread_t`]
5527 * [`HashSet::hasher`]
5528 * [`HashMap::hasher`]
5529 * [`CommandExt::exec`]
5530 * [`File::try_clone`]
5531 * [`SocketAddr::set_ip`]
5532 * [`SocketAddr::set_port`]
5533 * [`SocketAddrV4::set_ip`]
5534 * [`SocketAddrV4::set_port`]
5535 * [`SocketAddrV6::set_ip`]
5536 * [`SocketAddrV6::set_port`]
5537 * [`SocketAddrV6::set_flowinfo`]
5538 * [`SocketAddrV6::set_scope_id`]
5539 * [`slice::copy_from_slice`]
5540 * [`ptr::read_volatile`]
5541 * [`ptr::write_volatile`]
5542 * [`OpenOptions::create_new`]
5543 * [`TcpStream::set_nodelay`]
5544 * [`TcpStream::nodelay`]
5545 * [`TcpStream::set_ttl`]
5546 * [`TcpStream::ttl`]
5547 * [`TcpStream::set_only_v6`]
5548 * [`TcpStream::only_v6`]
5549 * [`TcpStream::take_error`]
5550 * [`TcpStream::set_nonblocking`]
5551 * [`TcpListener::set_ttl`]
5552 * [`TcpListener::ttl`]
5553 * [`TcpListener::set_only_v6`]
5554 * [`TcpListener::only_v6`]
5555 * [`TcpListener::take_error`]
5556 * [`TcpListener::set_nonblocking`]
5557 * [`UdpSocket::set_broadcast`]
5558 * [`UdpSocket::broadcast`]
5559 * [`UdpSocket::set_multicast_loop_v4`]
5560 * [`UdpSocket::multicast_loop_v4`]
5561 * [`UdpSocket::set_multicast_ttl_v4`]
5562 * [`UdpSocket::multicast_ttl_v4`]
5563 * [`UdpSocket::set_multicast_loop_v6`]
5564 * [`UdpSocket::multicast_loop_v6`]
5565 * [`UdpSocket::set_multicast_ttl_v6`]
5566 * [`UdpSocket::multicast_ttl_v6`]
5567 * [`UdpSocket::set_ttl`]
5568 * [`UdpSocket::ttl`]
5569 * [`UdpSocket::set_only_v6`]
5570 * [`UdpSocket::only_v6`]
5571 * [`UdpSocket::join_multicast_v4`]
5572 * [`UdpSocket::join_multicast_v6`]
5573 * [`UdpSocket::leave_multicast_v4`]
5574 * [`UdpSocket::leave_multicast_v6`]
5575 * [`UdpSocket::take_error`]
5576 * [`UdpSocket::connect`]
5577 * [`UdpSocket::send`]
5578 * [`UdpSocket::recv`]
5579 * [`UdpSocket::set_nonblocking`]
5584 * [`std::sync::Once` is poisoned if its initialization function
5586 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5587 * [Most types implement `fmt::Debug`][1.9db].
5588 * [The default buffer size used by `BufReader` and `BufWriter` was
5589 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5590 used by other languages.
5591 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5592 `Duration` additionally implements `*=` and `/=`][1.9ta].
5593 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5594 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5595 * [`Chain` implements `BufRead`][1.9ch].
5596 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5601 * [Cargo can now run concurrently][1.9cc].
5602 * [Top-level overrides allow specific revisions of crates to be
5603 overridden through the entire crate graph][1.9ct]. This is intended
5604 to make upgrades easier for large projects, by allowing crates to be
5605 forked temporarily until they've been upgraded and republished.
5606 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5607 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5608 on the commandline][1.9cf]. `rustc` arguments can also be specified
5609 in the `build.rustflags` configuration key.
5614 * [The time complexity of comparing variables for equivalence during type
5615 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5616 to major compilation time improvement in some scenarios.
5617 * [`ToString` is specialized for `str`, giving it the same performance
5618 as `to_owned`][1.9ts].
5619 * [Spawning processes with `Command::output` no longer creates extra
5621 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5622 for C-like enums][1.9cl].
5627 * [Passing the `--quiet` flag to a test runner will produce
5628 much-abbreviated output][1.9q].
5629 * The Rust Project now publishes std binaries for the
5630 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5631 `i586-pc-windows-msvc` targets.
5636 * [`std::sync::Once` is poisoned if its initialization function
5638 * [It is illegal to define methods with the same name in overlapping
5639 inherent `impl` blocks][1.9sn].
5640 * [`fn` item types are zero sized, and each `fn` names a unique
5641 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5642 `transmute` on a `fn` type will generate a warning for a few cycles,
5643 then will be converted to an error.
5644 * [Improvements to const evaluation may trigger new errors when integer
5645 literals are out of range][1.9ce].
5648 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5649 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5650 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5651 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5652 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5653 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5654 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5655 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5656 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5657 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5658 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5659 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5660 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5661 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5662 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5663 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5664 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5665 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5666 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5667 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5668 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5669 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5670 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5671 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5672 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5673 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5674 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5675 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5676 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5677 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5678 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5679 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5680 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5681 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5682 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5683 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5684 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5685 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5686 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5687 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5688 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5689 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5690 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5691 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5692 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5693 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5694 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5695 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5696 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5697 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5698 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5699 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5700 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5701 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5702 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5703 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5704 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5705 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5706 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5707 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5708 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5709 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5710 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5711 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5712 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5713 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5714 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5715 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5716 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5717 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5718 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5719 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5720 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5721 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5722 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5723 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5724 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5725 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5726 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5727 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5728 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5729 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5730 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5731 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5732 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5733 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5734 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5735 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5736 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5737 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5738 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5739 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5740 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5741 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5742 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5743 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5744 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5745 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5746 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5747 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5748 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5749 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5750 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5751 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5752 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5753 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5754 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5755 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5756 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5757 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5760 Version 1.8.0 (2016-04-14)
5761 ==========================
5766 * Rust supports overloading of compound assignment statements like
5767 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5768 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5769 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5771 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5772 addition to the non-braced form, `struct Foo;`. [RFC 218].
5778 * [`str::encode_utf16`] (renamed from `utf16_units`)
5779 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
5782 * [`ptr::drop_in_place`]
5784 * [`time::SystemTime`]
5786 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
5787 * [`Instant::elapsed`]
5788 * [`SystemTime::now`]
5789 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
5790 * [`SystemTime::elapsed`]
5791 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5792 * [`SystemTimeError`]
5793 * [`SystemTimeError::duration`]
5794 * Various impls for `SystemTimeError`
5796 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5797 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5798 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5799 * [The `write!` and `writeln!` macros correctly emit errors if any of
5800 their arguments can't be formatted][1.8w].
5801 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5802 * [The Unix-specific `raw` modules, which contain a number of
5803 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5804 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5805 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5806 across platforms was making it difficult to implement `std`
5807 correctly. Those that need these definitions should use the `libc`
5809 * The Unix-specific `MetadataExt` traits, including
5810 `os::unix::fs::MetadataExt`, which expose values such as inode
5811 numbers [no longer return platform-specific types][1.8r], but
5812 instead return widened integers. [RFC 1415].
5813 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
5814 * [Atomic loads and stores are not volatile][1.8a].
5815 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
5820 * [Inlining hash functions lead to a 3% compile-time improvement in
5821 some workloads][1.8h].
5822 * When using jemalloc, its symbols are [unprefixed so that it
5823 overrides the libc malloc implementation][1.8h]. This means that for
5824 rustc, LLVM is now using jemalloc, which results in a 6%
5825 compile-time improvement on a specific workload.
5826 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
5831 * [32-bit MSVC builds finally implement unwinding][1.8ms].
5832 i686-pc-windows-msvc is now considered a tier-1 platform.
5833 * [The `--print targets` flag prints a list of supported targets][1.8t].
5834 * [The `--print cfg` flag prints the `cfg`s defined for the current
5836 * [`rustc` can be built with an new Cargo-based build system, written
5837 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
5838 build system. To enable it configure with `configure --rustbuild`.
5839 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
5840 variants while also indicating the total number of missing variants
5841 if more than 3][1.8m].
5842 * [Executable stacks are disabled on Linux and BSD][1.8nx].
5843 * The Rust Project now publishes binary releases of the standard
5844 library for a number of tier-2 targets:
5845 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
5846 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
5847 `x86_64-rumprun-netbsd`. These can be installed with
5848 tools such as [multirust][1.8mr].
5853 * [`cargo init` creates a new Cargo project in the current
5854 directory][1.8ci]. It is otherwise like `cargo new`.
5855 * [Cargo has configuration keys for `-v` and
5856 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
5857 `[term]` section of `.cargo/config`.
5858 * [Configuration keys that evaluate to strings or integers can be set
5859 via environment variables][1.8ce]. For example the `build.jobs` key
5860 can be set via `CARGO_BUILD_JOBS`. Environment variables take
5861 precedence over config files.
5862 * [Target-specific dependencies support Rust `cfg` syntax for
5863 describing targets][1.8cfg] so that dependencies for multiple
5864 targets can be specified together. [RFC 1361].
5865 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
5866 `RUSTDOC` take precedence over the `build.target-dir`,
5867 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
5868 * [The child process tree is killed on Windows when Cargo is
5870 * [The `build.target` configuration value sets the target platform,
5871 like `--target`][1.8ct].
5876 * [Unstable compiler flags have been further restricted][1.8u]. Since
5877 1.0 `-Z` flags have been considered unstable, and other flags that
5878 were considered unstable additionally required passing `-Z
5879 unstable-options` to access. Unlike unstable language and library
5880 features though, these options have been accessible on the stable
5881 release channel. Going forward, *new unstable flags will not be
5882 available on the stable release channel*, and old unstable flags
5883 will warn about their usage. In the future, all unstable flags will
5884 be unavailable on the stable release channel.
5885 * [It is no longer possible to `match` on empty enum variants using
5886 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
5887 * The Unix-specific `MetadataExt` traits, including
5888 `os::unix::fs::MetadataExt`, which expose values such as inode
5889 numbers [no longer return platform-specific types][1.8r], but
5890 instead return widened integers. [RFC 1415].
5891 * [Modules sourced from the filesystem cannot appear within arbitrary
5892 blocks, but only within other modules][1.8mf].
5893 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
5894 * On Unix, [stack overflow triggers a runtime abort instead of a
5896 * [`Command::spawn` and its equivalents return an error if any of
5897 its command-line arguments contain interior `NUL`s][1.8n].
5898 * [Tuple and unit enum variants from other crates are in the type
5900 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
5901 type instead of `.a` files][1.8st]. Additionally, for the MSVC
5902 toolchain, `rustc` emits import libraries named `foo.dll.lib`
5903 instead of `foo.lib`.
5906 [1.8a]: https://github.com/rust-lang/rust/pull/30962
5907 [1.8b]: https://github.com/rust-lang/rust/pull/31123
5908 [1.8c]: https://github.com/rust-lang/rust/pull/31530
5909 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
5910 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
5911 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
5912 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
5913 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
5914 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
5915 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
5916 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
5917 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
5918 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
5919 [1.8h]: https://github.com/rust-lang/rust/pull/31460
5920 [1.8l]: https://github.com/rust-lang/rust/pull/31668
5921 [1.8m]: https://github.com/rust-lang/rust/pull/31020
5922 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
5923 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
5924 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
5925 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
5926 [1.8n]: https://github.com/rust-lang/rust/pull/31056
5927 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
5928 [1.8r]: https://github.com/rust-lang/rust/pull/31551
5929 [1.8so]: https://github.com/rust-lang/rust/pull/31333
5930 [1.8st]: https://github.com/rust-lang/rust/pull/29520
5931 [1.8t]: https://github.com/rust-lang/rust/pull/31358
5932 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
5933 [1.8u]: https://github.com/rust-lang/rust/pull/31793
5934 [1.8v]: https://github.com/rust-lang/rust/pull/31757
5935 [1.8w]: https://github.com/rust-lang/rust/pull/31904
5936 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
5937 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
5938 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
5939 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
5940 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
5941 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
5942 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
5943 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
5944 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
5945 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
5946 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
5947 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
5948 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
5949 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
5950 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
5951 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
5952 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
5953 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
5954 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
5955 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
5956 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
5957 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
5958 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
5959 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
5960 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
5961 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
5962 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
5963 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
5964 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
5965 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
5968 Version 1.7.0 (2016-03-03)
5969 ==========================
5976 * [`Path::strip_prefix`] (renamed from relative_from)
5977 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
5979 * [`Ipv4Addr::is_loopback`]
5980 * [`Ipv4Addr::is_private`]
5981 * [`Ipv4Addr::is_link_local`]
5982 * [`Ipv4Addr::is_multicast`]
5983 * [`Ipv4Addr::is_broadcast`]
5984 * [`Ipv4Addr::is_documentation`]
5986 * [`Ipv6Addr::is_unspecified`]
5987 * [`Ipv6Addr::is_loopback`]
5988 * [`Ipv6Addr::is_multicast`]
5991 * [`Vec::as_mut_slice`]
5993 * [`String::as_str`]
5994 * [`String::as_mut_str`]
5996 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
5998 * `<[T]>::`[`sort_by_key`]
5999 * checked, saturated, and overflowing operations
6000 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6001 * [`i32::saturating_mul`]
6002 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6003 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6004 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6005 * [`u32::saturating_mul`]
6006 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6007 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6008 * and checked, saturated, and overflowing operations for other primitive types
6010 * [`ffi::IntoStringError`]
6011 * [`CString::into_string`]
6012 * [`CString::into_bytes`]
6013 * [`CString::into_bytes_with_nul`]
6014 * `From<CString> for Vec<u8>`
6016 * [`IntoStringError::into_cstring`]
6017 * [`IntoStringError::utf8_error`]
6018 * `Error for IntoStringError`
6020 * [`std::hash::BuildHasher`]
6021 * [`BuildHasher::Hasher`]
6022 * [`BuildHasher::build_hasher`]
6023 * [`std::hash::BuildHasherDefault`]
6024 * [`HashMap::with_hasher`]
6025 * [`HashMap::with_capacity_and_hasher`]
6026 * [`HashSet::with_hasher`]
6027 * [`HashSet::with_capacity_and_hasher`]
6028 * [`std::collections::hash_map::RandomState`]
6029 * [`RandomState::new`]
6030 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6031 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6032 from bytes is faster.
6033 * [The performance of `LineWriter` (and thus `io::stdout`) was
6034 improved by using `memchr` to search for newlines][1.7m].
6035 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6036 `f64` variants were stabilized previously.
6037 * [`BTreeMap` was rewritten to use less memory and improve the performance
6038 of insertion and iteration, the latter by as much as 5x][1.7bm].
6039 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6040 covariant over their contained type][1.7bt].
6041 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6042 over their contained type][1.7ll].
6043 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6045 * [`Any` is implemented for unsized types][1.7a].
6046 * [`Hash` is implemented for `Duration`][1.7h].
6051 * [When running tests with `--test`, rustdoc will pass `--cfg`
6052 arguments to the compiler][1.7dt].
6053 * [The compiler is built with RPATH information by default][1.7rpa].
6054 This means that it will be possible to run `rustc` when installed in
6055 unusual configurations without configuring the dynamic linker search
6057 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6058 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6059 over `LD_LIBRARY_PATH`.
6064 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6065 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6066 * [The `rerun-if-changed` build script directive no longer causes the
6067 build script to incorrectly run twice in certain scenarios][1.7rr].
6072 * Soundness fixes to the interactions between associated types and
6073 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6074 code that violates the new rules. This is a significant change that
6075 is known to break existing code, so it has emitted warnings for the
6076 new error cases since 1.4 to give crate authors time to adapt. The
6077 details of what is changing are subtle; read the RFC for more.
6078 * [Several bugs in the compiler's visibility calculations were
6079 fixed][1.7v]. Since this was found to break significant amounts of
6080 code, the new errors will be emitted as warnings for several release
6081 cycles, under the `private_in_public` lint.
6082 * Defaulted type parameters were accidentally accepted in positions
6083 that were not intended. In this release, [defaulted type parameters
6084 appearing outside of type definitions will generate a
6085 warning][1.7d], which will become an error in future releases.
6086 * [Parsing "." as a float results in an error instead of 0][1.7p].
6087 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6088 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6090 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6091 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6092 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6093 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6094 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6095 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6096 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6097 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6098 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6099 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6100 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6101 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6102 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6103 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6104 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6105 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6106 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6107 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6108 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6109 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6110 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6111 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6112 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6113 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6114 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6115 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6116 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6117 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6118 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6119 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6120 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6121 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6122 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6123 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6124 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6125 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6126 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6127 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6128 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6129 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6130 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6131 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6132 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6133 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6134 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6135 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6136 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6137 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6138 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6139 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6140 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6141 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6142 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6143 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6144 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6145 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6146 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6147 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6148 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6149 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6150 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6151 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6152 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6153 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6154 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6155 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6156 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6157 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6158 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6159 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6160 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6161 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6162 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6163 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6164 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6165 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6166 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6167 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6168 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6171 Version 1.6.0 (2016-01-21)
6172 ==========================
6177 * The `#![no_std]` attribute causes a crate to not be linked to the
6178 standard library, but only the [core library][1.6co], as described
6179 in [RFC 1184]. The core library defines common types and traits but
6180 has no platform dependencies whatsoever, and is the basis for Rust
6181 software in environments that cannot support a full port of the
6182 standard library, such as operating systems. Most of the core
6183 library is now stable.
6189 [`Read::read_exact`],
6190 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6191 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6192 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6193 [`os::unix::fs::DirBuilderExt`],
6194 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6195 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6196 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6197 [`collections::hash_map::Drain`],
6198 [`collections::hash_map::HashMap::drain`],
6199 [`collections::hash_set::Drain`],
6200 [`collections::hash_set::HashSet::drain`],
6201 [`collections::binary_heap::Drain`],
6202 [`collections::binary_heap::BinaryHeap::drain`],
6203 [`Vec::extend_from_slice`] (renamed from `push_all`),
6204 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6205 [`RwLock::into_inner`],
6206 [`Iterator::min_by_key`] (renamed from `min_by`),
6207 [`Iterator::max_by_key`] (renamed from `max_by`).
6208 * The [core library][1.6co] is stable, as are most of its APIs.
6209 * [The `assert_eq!` macro supports arguments that don't implement
6210 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6212 * Several timer functions that take duration in milliseconds [are
6213 deprecated in favor of those that take `Duration`][1.6ms]. These
6214 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6215 `thread::park_timeout_ms`.
6216 * The algorithm by which `Vec` reserves additional elements was
6217 [tweaked to not allocate excessive space][1.6a] while still growing
6219 * `From` conversions are [implemented from integers to floats][1.6f]
6220 in cases where the conversion is lossless. Thus they are not
6221 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6222 or `f64`. They are also not implemented for `isize` and `usize`
6223 because the implementations would be platform-specific. `From` is
6224 also implemented from `f32` to `f64`.
6225 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6226 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6227 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6228 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6230 * Sorting slices that are already sorted [is 50% faster in some
6236 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6237 * Cargo build scripts can specify their dependencies by emitting the
6238 [`rerun-if-changed`][1.6rr] key.
6239 * crates.io will reject publication of crates with dependencies that
6240 have a wildcard version constraint. Crates with wildcard
6241 dependencies were seen to cause a variety of problems, as described
6242 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6244 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6245 release folder. A variety of artifacts that Cargo failed to clean
6246 are now correctly deleted.
6251 * The `unreachable_code` lint [warns when a function call's argument
6253 * The parser indicates [failures that may be caused by
6254 confusingly-similar Unicode characters][1.6uc]
6255 * Certain macro errors [are reported at definition time][1.6m], not
6261 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6262 environment variable when locating crates. This was a pre-cargo
6263 feature for integrating with the package manager that was
6264 accidentally never removed.
6265 * [A number of bugs were fixed in the privacy checker][1.6p] that
6266 could cause previously-accepted code to break.
6267 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6268 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6269 struct pattern syntax (`Foo(..)`) can no longer be used to match
6270 unit structs. This is a warning now, but will become an error in
6271 future releases. Patterns that share the same name as a const are
6273 * A bug was fixed that causes [rustc not to apply default type
6274 parameters][1.6xc] when resolving certain method implementations of
6275 traits defined in other crates.
6277 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6278 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6279 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6280 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6281 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6282 [1.6co]: http://doc.rust-lang.org/core/index.html
6283 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6284 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6285 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6286 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6287 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6288 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6289 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6290 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6291 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6292 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6293 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6294 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6295 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6296 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6297 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6298 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6299 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6300 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6301 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6302 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6303 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6304 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6305 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6306 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6307 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6308 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6309 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6310 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6311 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6312 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6313 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6314 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6315 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6316 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6317 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6318 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6319 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6320 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6321 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6322 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6323 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6326 Version 1.5.0 (2015-12-10)
6327 ==========================
6329 * ~700 changes, numerous bugfixes
6335 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6336 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6337 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6338 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6339 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6340 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6341 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6342 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6343 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6344 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6345 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6346 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6347 [`Path::read_link`], [`Path::symlink_metadata`],
6348 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6349 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6350 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6351 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6352 [`slice::split_first_mut`], [`slice::split_first`],
6353 [`slice::split_last_mut`], [`slice::split_last`],
6354 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6355 [`str::MatchIndices`], [`str::RMatchIndices`],
6356 [`str::match_indices`], [`str::rmatch_indices`],
6357 [`str::slice_mut_unchecked`], [`string::ParseError`].
6358 * Rust applications hosted on crates.io can be installed locally to
6359 `~/.cargo/bin` with the [`cargo install`] command. Among other
6360 things this makes it easier to augment Cargo with new subcommands:
6361 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6362 invoked as `cargo foo`.
6363 * Crates with wildcard (`*`) dependencies will [emit warnings when
6364 published][1.5w]. In 1.6 it will no longer be possible to publish
6365 crates with wildcard dependencies.
6370 * The rules determining when a particular lifetime must outlive
6371 a particular value (known as '[dropck]') have been [modified
6372 to not rely on parametricity][1.5p].
6373 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6374 and `Arc`][1.5a]. Because these smart pointer types implement
6375 `Deref`, this causes breakage in cases where the interior type
6376 contains methods of the same name.
6377 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6378 that they could drop their content. Soundness fix.
6379 * All method invocations are [properly checked][1.5wf1] for
6380 [well-formedness][1.5wf2]. Soundness fix.
6381 * Traits whose supertraits contain `Self` are [not object
6382 safe][1.5o]. Soundness fix.
6383 * Target specifications support a [`no_default_libraries`][1.5nd]
6384 setting that controls whether `-nodefaultlibs` is passed to the
6385 linker, and in turn the `is_like_windows` setting no longer affects
6386 the `-nodefaultlibs` flag.
6387 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6388 * The `#[inline]` and `#[repr]` attributes [can only appear
6389 in valid locations][1.5at].
6390 * Native libraries linked from the local crate are [passed to
6391 the linker before native libraries from upstream crates][1.5nl].
6392 * Two rarely-used attributes, `#[no_debug]` and
6393 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6394 * Negation of unsigned integers, which has been a warning for
6395 several releases, [is now behind a feature gate and will
6396 generate errors][1.5nu].
6397 * The parser accidentally accepted visibility modifiers on
6398 enum variants, a bug [which has been fixed][1.5ev].
6399 * [A bug was fixed that allowed `use` statements to import unstable
6405 * When evaluating expressions at compile-time that are not
6406 compile-time constants (const-evaluating expressions in non-const
6407 contexts), incorrect code such as overlong bitshifts and arithmetic
6408 overflow will [generate a warning instead of an error][1.5ce],
6409 delaying the error until runtime. This will allow the
6410 const-evaluator to be expanded in the future backwards-compatibly.
6411 * The `improper_ctypes` lint [no longer warns about using `isize` and
6412 `usize` in FFI][1.5ict].
6417 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6419 * `Default` is [implemented for mutable slices][1.5d].
6420 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6421 * There are now `From` conversions [between floating point
6422 types][1.5f] where the conversions are lossless.
6423 * There are now `From` conversions [between integer types][1.5i] where
6424 the conversions are lossless.
6425 * [`fs::Metadata` implements `Clone`][1.5fs].
6426 * The `parse` method [accepts a leading "+" when parsing
6428 * [`AsMut` is implemented for `Vec`][1.5am].
6429 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6430 been optimized][1.5cf] and no longer rely on the default impl.
6431 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6432 `unsafe extern "C"` function types now [implement `Clone`,
6433 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6434 `fmt::Debug` for up to 12 arguments][1.5fp].
6435 * [Dropping `Vec`s is much faster in unoptimized builds when the
6436 element types don't implement `Drop`][1.5dv].
6437 * A bug that caused in incorrect behavior when [combining `VecDeque`
6438 with zero-sized types][1.5vdz] was resolved.
6439 * [`PartialOrd` for slices is faster][1.5po].
6444 * [Crate metadata size was reduced by 20%][1.5md].
6445 * [Improvements to code generation reduced the size of libcore by 3.3
6446 MB and rustc's memory usage by 18MB][1.5m].
6447 * [Improvements to deref translation increased performance in
6448 unoptimized builds][1.5dr].
6449 * Various errors in trait resolution [are deduplicated to only be
6450 reported once][1.5te].
6451 * Rust has preliminary [support for rumprun kernels][1.5rr].
6452 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6454 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6455 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6456 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6457 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6458 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6459 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6460 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6461 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6462 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6463 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6464 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6465 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6466 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6467 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6468 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6469 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6470 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6471 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6472 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6473 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6474 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6475 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6476 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6477 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6478 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6479 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6480 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6481 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6482 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6483 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6484 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6485 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6486 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6487 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6488 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6489 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6490 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6491 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6492 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6493 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6494 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6495 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6496 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6497 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6498 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6499 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6500 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6501 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6502 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6503 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6504 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6505 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6506 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6507 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6508 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6509 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6510 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6511 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6512 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6513 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6514 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6515 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6516 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6517 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6518 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6519 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6520 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6521 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6522 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6523 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6524 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6525 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6526 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6527 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6528 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6529 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6530 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6531 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6532 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6533 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6534 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6535 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6536 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6537 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6538 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6539 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6540 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6541 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6542 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6544 Version 1.4.0 (2015-10-29)
6545 ==========================
6547 * ~1200 changes, numerous bugfixes
6552 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6553 GNU) are now supported and recommended for use.
6558 * [Several changes have been made to fix type soundness and improve
6559 the behavior of associated types][sound]. See [RFC 1214]. Although
6560 we have mostly introduced these changes as warnings this release, to
6561 become errors next release, there are still some scenarios that will
6562 see immediate breakage.
6563 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6564 line breaks in addition to `\n`][crlf].
6565 * [Loans of `'static` lifetime extend to the end of a function][stat].
6566 * [`str::parse` no longer introduces avoidable rounding error when
6567 parsing floating point numbers. Together with earlier changes to
6568 float formatting/output, "round trips" like f.to_string().parse()
6569 now preserve the value of f exactly. Additionally, leading plus
6570 signs are now accepted][fp3].
6576 * `use` statements that import multiple items [can now rename
6577 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6578 * [Binops work correctly on fat pointers][binfat].
6579 * `pub extern crate`, which does not behave as expected, [issues a
6580 warning][pec] until a better solution is found.
6585 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6586 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6587 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6588 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6589 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6590 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6591 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6592 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6593 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6594 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6595 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6596 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6597 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6598 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6599 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6600 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6601 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6602 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6604 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6605 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6606 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6607 `f64::from_str_radix`.
6608 * [Reverse-searching strings is faster with the 'two-way'
6610 * [`std::io::copy` allows `?Sized` arguments][cc].
6611 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6612 [override `count`, `nth` and `last` with an O(1)
6613 implementation][it].
6614 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6615 * [`IntoRawFd` has been added to the Unix-specific prelude,
6616 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6618 * [`Extend<String>` and `FromIterator<String` are both implemented for
6620 * [`IntoIterator` is implemented for references to `Option` and
6622 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6623 Copy`][ext] as part of [RFC 839]. This will cause type inference
6624 breakage in rare situations.
6625 * [`BinaryHeap` implements `Debug`][bh2].
6626 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6628 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6629 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6630 * [String comparison is faster][faststr].
6631 * `&mut T` where `T: std::fmt::Write` [also implements
6632 `std::fmt::Write`][mutw].
6633 * [A stable regression in `VecDeque::push_back` and other
6634 capacity-altering methods that caused panics for zero-sized types
6636 * [Function pointers implement traits for up to 12 parameters][fp2].
6641 * The compiler [no longer uses the 'morestack' feature to prevent
6642 stack overflow][mm]. Instead it uses guard pages and stack
6643 probes (though stack probes are not yet implemented on any platform
6645 * [The compiler matches traits faster when projections are involved][p].
6646 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6648 * [Cargo now displays useful information about what its doing during
6649 `cargo update`][cu].
6651 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6652 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6653 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6654 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6655 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6656 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6657 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6658 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6659 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6660 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6661 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6662 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6663 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6664 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6665 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6666 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6667 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6668 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6669 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6670 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6671 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6672 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6673 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6674 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6675 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6676 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6677 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6678 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6679 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6680 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6681 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6682 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6683 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6684 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6685 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6686 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6687 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6688 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6689 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6690 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6691 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6692 [bh2]: https://github.com/rust-lang/rust/pull/28156
6693 [binfat]: https://github.com/rust-lang/rust/pull/28270
6694 [bm]: https://github.com/rust-lang/rust/pull/28197
6695 [cc]: https://github.com/rust-lang/rust/pull/27531
6696 [crlf]: https://github.com/rust-lang/rust/pull/28034
6697 [cu]: https://github.com/rust-lang/cargo/pull/1931
6698 [d]: https://github.com/rust-lang/rust/pull/27825
6699 [dep]: https://github.com/rust-lang/rust/pull/28339
6700 [es]: https://github.com/rust-lang/rust/pull/27956
6701 [ext]: https://github.com/rust-lang/rust/pull/28094
6702 [faststr]: https://github.com/rust-lang/rust/pull/28338
6703 [ffi]: https://github.com/rust-lang/rust/pull/28779
6704 [fp]: https://github.com/rust-lang/rust/pull/28268
6705 [fp2]: https://github.com/rust-lang/rust/pull/28560
6706 [fp3]: https://github.com/rust-lang/rust/pull/27307
6707 [i]: https://github.com/rust-lang/rust/pull/27451
6708 [into2]: https://github.com/rust-lang/rust/pull/28039
6709 [it]: https://github.com/rust-lang/rust/pull/27652
6710 [mm]: https://github.com/rust-lang/rust/pull/27338
6711 [mutw]: https://github.com/rust-lang/rust/pull/28368
6712 [sound]: https://github.com/rust-lang/rust/pull/27641
6713 [p]: https://github.com/rust-lang/rust/pull/27866
6714 [pec]: https://github.com/rust-lang/rust/pull/28486
6715 [pr]: https://github.com/rust-lang/rust/pull/27896
6716 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6717 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6718 [s]: https://github.com/rust-lang/rust/pull/27474
6719 [stab]: https://github.com/rust-lang/rust/pull/28339
6720 [stat]: https://github.com/rust-lang/rust/pull/28321
6721 [vd]: https://github.com/rust-lang/rust/pull/28494
6723 Version 1.3.0 (2015-09-17)
6724 ==============================
6726 * ~900 changes, numerous bugfixes
6731 * The [new object lifetime defaults][nold] have been [turned
6732 on][nold2] after a cycle of warnings about the change. Now types
6733 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6734 being interpreted as `&'a Box<Trait+'a>` to `&'a
6735 Box<Trait+'static>`.
6736 * [The Rustonomicon][nom] is a new book in the official documentation
6737 that dives into writing unsafe Rust.
6738 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6739 timekeeping is employed by other std APIs, as well as out-of-tree
6745 * The [new object lifetime defaults][nold] have been [turned
6746 on][nold2] after a cycle of warnings about the change.
6747 * There is a known [regression][lr] in how object lifetime elision is
6748 interpreted, the proper solution for which is undetermined.
6749 * The `#[prelude_import]` attribute, an internal implementation
6750 detail, was accidentally stabilized previously. [It has been put
6751 behind the `prelude_import` feature gate][pi]. This change is
6752 believed to break no existing code.
6753 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6754 [more sane for dynamically sized types][dst3]. Code that relied on
6755 the previous behavior is thought to be broken.
6756 * The `dropck` rules, which checks that destructors can't access
6757 destroyed values, [have been updated][dropck] to match the
6758 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6759 cause some previously-compiling code to no longer build.
6764 * The [new object lifetime defaults][nold] have been [turned
6765 on][nold2] after a cycle of warnings about the change.
6766 * Semicolons may [now follow types and paths in
6767 macros](https://github.com/rust-lang/rust/pull/27000).
6768 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6769 [more sane for dynamically sized types][dst3]. Code that relied on
6770 the previous behavior is not known to exist, and suspected to be
6772 * `'static` variables [may now be recursive][st].
6773 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6774 implementations correctly.
6775 * The `dropck` rules, which checks that destructors can't access
6776 destroyed values, [have been updated][dropck] to match the
6782 * The [`Duration`] API, [has been stabilized][ds], as well as the
6783 `std::time` module, which presently contains only `Duration`.
6784 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6785 * The owned C string, [`CString`], implements [`Borrow`] and the
6786 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6787 these allow C strings to be borrowed and cloned in generic code.
6788 * [`CStr`] implements [`Debug`].
6789 * [`AtomicPtr`] implements [`Debug`].
6790 * [`Error`] trait objects [can be downcast to their concrete types][e]
6791 in many common configurations, using the [`is`], [`downcast`],
6792 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6794 * Searching for substrings now [employs the two-way algorithm][search]
6795 instead of doing a naive search. This gives major speedups to a
6796 number of methods, including [`contains`][sc], [`find`][sf],
6797 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6798 [`ends_with`][sew] are also faster.
6799 * The performance of `PartialEq` for slices is [much faster][ps].
6800 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6801 is overridden and optimized by the implementations for scalars.
6802 * The [`Hasher`] trait now has a number of specialized `write_*`
6803 methods for primitive types, for efficiency.
6804 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6805 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6806 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6807 of [`std::error::Error::cause`][iec] also delegates to the inner
6809 * [`process::Child`][pc] gained the [`id`] method, which returns a
6810 `u32` representing the platform-specific process identifier.
6811 * The [`connect`] method on slices is deprecated, replaced by the new
6812 [`join`] method (note that both of these are on the *unstable*
6813 [`SliceConcatExt`] trait, but through the magic of the prelude are
6814 available to stable code anyway).
6815 * The [`Div`] operator is implemented for [`Wrapping`] types.
6816 * [`DerefMut` is implemented for `String`][dms].
6817 * Performance of SipHash (the default hasher for `HashMap`) is
6818 [better for long data][sh].
6819 * [`AtomicPtr`] implements [`Send`].
6820 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
6821 are now [specialized to use uninitialized buffers for increased
6823 * Lifetime parameters of foreign functions [are now resolved
6829 * Rust can now, with some coercion, [produce programs that run on
6830 Windows XP][xp], though XP is not considered a supported platform.
6831 * Porting Rust on Windows from the GNU toolchain to MSVC continues
6832 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
6833 recommended for use in 1.3, though should be fully-functional
6834 in the [64-bit 1.4 beta][b14].
6835 * On Fedora-based systems installation will [properly configure the
6836 dynamic linker][fl].
6837 * The compiler gained many new extended error descriptions, which can
6838 be accessed with the `--explain` flag.
6839 * The `dropck` pass, which checks that destructors can't access
6840 destroyed values, [has been rewritten][dropck]. This fixes some
6841 soundness holes, and as such will cause some previously-compiling
6842 code to no longer build.
6843 * `rustc` now uses [LLVM to write archive files where possible][ar].
6844 Eventually this will eliminate the compiler's dependency on the ar
6846 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
6847 supported FreeBSD on x86_64).
6848 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
6849 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
6851 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
6852 will kill the process instead of leaking][nlp].
6854 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
6855 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
6856 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
6857 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
6858 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
6859 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6860 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6861 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
6862 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
6863 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
6864 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
6865 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
6866 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
6867 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6868 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
6869 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
6870 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
6871 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
6872 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6873 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
6874 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
6875 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
6876 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
6877 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6878 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
6879 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
6880 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
6881 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
6882 [ar]: https://github.com/rust-lang/rust/pull/26926
6883 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
6884 [dms]: https://github.com/rust-lang/rust/pull/26241
6885 [dropck]: https://github.com/rust-lang/rust/pull/27261
6886 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6887 [ds]: https://github.com/rust-lang/rust/pull/26818
6888 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
6889 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
6890 [dst3]: https://github.com/rust-lang/rust/pull/27351
6891 [e]: https://github.com/rust-lang/rust/pull/24793
6892 [f]: https://github.com/rust-lang/rust/pull/26588
6893 [fb]: https://github.com/rust-lang/rust/pull/26959
6894 [fl]: https://github.com/rust-lang/rust-installer/pull/41
6895 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6896 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
6897 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
6898 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
6899 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
6900 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
6901 [lic]: https://github.com/rust-lang/rust/pull/26583
6902 [lnu]: https://github.com/rust-lang/rust/pull/27026
6903 [lr]: https://github.com/rust-lang/rust/issues/27248
6904 [lum]: https://github.com/rust-lang/rust/pull/26378
6905 [lur]: https://github.com/rust-lang/rust/pull/26783
6906 [nlp]: https://github.com/rust-lang/rust/pull/27176
6907 [nold2]: https://github.com/rust-lang/rust/pull/27045
6908 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
6909 [nom]: http://doc.rust-lang.org/nightly/nomicon/
6910 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
6911 [pi]: https://github.com/rust-lang/rust/pull/26699
6912 [ps]: https://github.com/rust-lang/rust/pull/26884
6913 [rte]: https://github.com/rust-lang/rust/pull/26950
6914 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
6915 [search]: https://github.com/rust-lang/rust/pull/26327
6916 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
6917 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
6918 [sh]: https://github.com/rust-lang/rust/pull/27280
6919 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
6920 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
6921 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
6922 [st]: https://github.com/rust-lang/rust/pull/26630
6923 [win1]: https://github.com/rust-lang/rust/pull/26569
6924 [win2]: https://github.com/rust-lang/rust/pull/26741
6925 [win3]: https://github.com/rust-lang/rust/pull/26741
6926 [win4]: https://github.com/rust-lang/rust/pull/27210
6927 [xp]: https://github.com/rust-lang/rust/pull/26569
6929 Version 1.2.0 (2015-08-07)
6930 ==========================
6932 * ~1200 changes, numerous bugfixes
6937 * [Dynamically-sized-type coercions][dst] allow smart pointer types
6938 like `Rc` to contain types without a fixed size, arrays and trait
6939 objects, finally enabling use of `Rc<[T]>` and completing the
6940 implementation of DST.
6941 * [Parallel codegen][parcodegen] is now working again, which can
6942 substantially speed up large builds in debug mode; It also gets
6943 another ~33% speedup when bootstrapping on a 4 core machine (using 8
6944 jobs). It's not enabled by default, but will be "in the near
6945 future". It can be activated with the `-C codegen-units=N` flag to
6947 * This is the first release with [experimental support for linking
6948 with the MSVC linker and lib C on Windows (instead of using the GNU
6949 variants via MinGW)][win]. It is yet recommended only for the most
6950 intrepid Rustaceans.
6951 * Benchmark compilations are showing a 30% improvement in
6952 bootstrapping over 1.1.
6957 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
6958 unicode case mapping, which is a previously-planned change in
6959 behavior and considered a bugfix.
6960 * [`mem::align_of`] now specifies [the *minimum alignment* for
6961 T][align], which is usually the alignment programs are interested
6962 in, and the same value reported by clang's
6963 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
6965 * [The `#[packed]` attribute is no longer silently accepted by the
6966 compiler][packed]. This attribute did nothing and code that
6967 mentioned it likely did not work as intended.
6968 * Associated type defaults are [now behind the
6969 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
6970 defaults *did not work*, but could be mentioned syntactically. As
6971 such this breakage has minimal impact.
6976 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
6977 matching against dereferenceable values.
6982 * The [`Extend`] trait, which grows a collection from an iterator, is
6983 implemented over iterators of references, for `String`, `Vec`,
6984 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
6985 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
6986 * The [`iter::once`] function returns an iterator that yields a single
6987 element, and [`iter::empty`] returns an iterator that yields no
6989 * The [`matches`] and [`rmatches`] methods on `str` return iterators
6990 over substring matches.
6991 * [`Cell`] and [`RefCell`] both implement `Eq`.
6992 * A number of methods for wrapping arithmetic are added to the
6993 integral types, [`wrapping_div`], [`wrapping_rem`],
6994 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
6995 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
6996 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
6997 type.. It is illegal for the default arithmetic operations in Rust
6998 to overflow; the desire to wrap must be explicit.
6999 * The `{:#?}` formatting specifier [displays the alternate,
7000 pretty-printed][debugfmt] form of the `Debug` formatter. This
7001 feature was actually introduced prior to 1.0 with little
7003 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7004 for writing data to formatted strings, similar to [`io::Write`].
7005 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7006 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7007 are used by code generators to emit implementations of [`Debug`].
7008 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7009 methods that convert case, following Unicode case mapping.
7010 * It is now easier to handle poisoned locks. The [`PoisonError`]
7011 type, returned by failing lock operations, exposes `into_inner`,
7012 `get_ref`, and `get_mut`, which all give access to the inner lock
7013 guard, and allow the poisoned lock to continue to operate. The
7014 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7015 poisoned lock without attempting to take the lock.
7016 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7017 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7018 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7019 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7021 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7027 * `rustc` employs smarter heuristics for guessing at [typos].
7028 * `rustc` emits more efficient code for [no-op conversions between
7029 unsafe pointers][nop].
7030 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7031 resulting in faster compile times and smaller code.
7033 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7034 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7035 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7036 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7037 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7038 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7039 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7040 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7041 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7042 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7043 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7044 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7045 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7046 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7047 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7048 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7049 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7050 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7051 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7052 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7053 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7054 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7055 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7056 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7057 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7058 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7059 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7060 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7061 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7062 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7063 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7064 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7065 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7066 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7067 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7068 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7069 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7070 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7071 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7072 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7073 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7074 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7075 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7076 [align]: https://github.com/rust-lang/rust/pull/25646
7077 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7078 [typos]: https://github.com/rust-lang/rust/pull/26087
7079 [nop]: https://github.com/rust-lang/rust/pull/26336
7080 [fat]: https://github.com/rust-lang/rust/pull/26411
7081 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7082 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7083 [packed]: https://github.com/rust-lang/rust/pull/25541
7084 [ad]: https://github.com/rust-lang/rust/pull/27382
7085 [win]: https://github.com/rust-lang/rust/pull/25350
7087 Version 1.1.0 (2015-06-25)
7088 =========================
7090 * ~850 changes, numerous bugfixes
7095 * The [`std::fs` module has been expanded][fs] to expand the set of
7096 functionality exposed:
7097 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7098 don't incur a syscall on some platforms.
7099 * A `symlink_metadata` function has been added.
7100 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7101 access to all underlying information.
7102 * The compiler now contains extended explanations of many errors. When an error
7103 with an explanation occurs the compiler suggests using the `--explain` flag
7104 to read the explanation. Error explanations are also [available online][err-index].
7105 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7106 well as other work, the time to bootstrap the compiler decreased by
7112 * The [`str::split_whitespace`] method splits a string on unicode
7113 whitespace boundaries.
7114 * On both Windows and Unix, new extension traits provide conversion of
7115 I/O types to and from the underlying system handles. On Unix, these
7116 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7117 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7118 `TcpListener`, and `UpdSocket`. Further implementations for
7119 `std::process` will be stabilized later.
7120 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7121 Windows, symlinks can be created with
7122 `std::os::windows::symlink_dir` and
7123 `std::os::windows::symlink_file`.
7124 * The `mpsc::Receiver` type can now be converted into an iterator with
7125 `into_iter` on the [`IntoIterator`] trait.
7126 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7127 implementation of the [`From`] trait.
7128 * The `Debug` implementation for `RangeFull` [creates output that is
7129 more consistent with other implementations][rf].
7130 * [`Debug` is implemented for `File`][file].
7131 * The `Default` implementation for `Arc` [no longer requires `Sync +
7133 * [The `Iterator` methods `count`, `nth`, and `last` have been
7134 overridden for slices to have O(1) performance instead of O(n)][si].
7135 * Incorrect handling of paths on Windows has been improved in both the
7136 compiler and the standard library.
7137 * [`AtomicPtr` gained a `Default` implementation][ap].
7138 * In accordance with Rust's policy on arithmetic overflow `abs` now
7139 [panics on overflow when debug assertions are enabled][abs].
7140 * The [`Cloned`] iterator, which was accidentally left unstable for
7141 1.0 [has been stabilized][c].
7142 * The [`Incoming`] iterator, which iterates over incoming TCP
7143 connections, and which was accidentally unnamable in 1.0, [is now
7144 properly exported][inc].
7145 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7146 `sift_up` or `sift_down` panic][bh].
7147 * The [`split_off`] method of `LinkedList` [no longer corrupts
7148 the list in certain scenarios][ll].
7153 * Type checking performance [has improved notably][sk] with
7154 [multiple improvements][pre].
7155 * The compiler [suggests code changes][ch] for more errors.
7156 * rustc and it's build system have experimental support for [building
7157 toolchains against MUSL][m] instead of glibc on Linux.
7158 * The compiler defines the `target_env` cfg value, which is used for
7159 distinguishing toolchains that are otherwise for the same
7160 platform. Presently this is set to `gnu` for common GNU Linux
7161 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7162 * The [`cargo rustc`][crc] command invokes a build with custom flags
7164 * [Android executables are always position independent][pie].
7165 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7168 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7169 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7170 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7171 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7172 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7173 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7174 [rf]: https://github.com/rust-lang/rust/pull/24491
7175 [err-index]: https://doc.rust-lang.org/error-index.html
7176 [sk]: https://github.com/rust-lang/rust/pull/24615
7177 [pre]: https://github.com/rust-lang/rust/pull/25323
7178 [file]: https://github.com/rust-lang/rust/pull/24598
7179 [ch]: https://github.com/rust-lang/rust/pull/24683
7180 [arc]: https://github.com/rust-lang/rust/pull/24695
7181 [si]: https://github.com/rust-lang/rust/pull/24701
7182 [ap]: https://github.com/rust-lang/rust/pull/24834
7183 [m]: https://github.com/rust-lang/rust/pull/24777
7184 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7185 [crc]: https://github.com/rust-lang/cargo/pull/1568
7186 [pie]: https://github.com/rust-lang/rust/pull/24953
7187 [abs]: https://github.com/rust-lang/rust/pull/25441
7188 [c]: https://github.com/rust-lang/rust/pull/25496
7189 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7190 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7191 [inc]: https://github.com/rust-lang/rust/pull/25522
7192 [bh]: https://github.com/rust-lang/rust/pull/25856
7193 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7194 [ll]: https://github.com/rust-lang/rust/pull/26022
7195 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7196 [drop]: https://github.com/rust-lang/rust/pull/24935
7198 Version 1.0.0 (2015-05-15)
7199 ========================
7201 * ~1500 changes, numerous bugfixes
7206 * The vast majority of the standard library is now `#[stable]`. It is
7207 no longer possible to use unstable features with a stable build of
7209 * Many popular crates on [crates.io] now work on the stable release
7211 * Arithmetic on basic integer types now [checks for overflow in debug
7217 * Several [restrictions have been added to trait coherence][coh] in
7218 order to make it easier for upstream authors to change traits
7219 without breaking downstream code.
7220 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7221 improve error messages and macro behavior. For example, `0b1234` is
7222 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7223 * Trait bounds [are always invariant][inv], eliminating the need for
7224 the `PhantomFn` and `MarkerTrait` lang items, which have been
7226 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7227 "foo" as bar` syntax has been replaced with `extern crate foo as
7228 bar`, and Cargo now automatically translates "-" in *package* names
7229 to underscore for the crate name.
7230 * [Lifetime shadowing is an error][lt].
7231 * [`Send` no longer implies `'static`][send-rfc].
7232 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7233 `MyType::default()`.
7234 * Primitive types [now have inherent methods][prim-inherent],
7235 obviating the need for extension traits like `SliceExt`.
7236 * Methods with `Self: Sized` in their `where` clause are [considered
7237 object-safe][self-sized], allowing many extension traits like
7238 `IteratorExt` to be merged into the traits they extended.
7239 * You can now [refer to associated types][assoc-where] whose
7240 corresponding trait bounds appear only in a `where` clause.
7241 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7242 like `Send` and `Sync` are now library-defined.
7243 * A [Reflect trait][reflect] was introduced, which means that
7244 downcasting via the `Any` trait is effectively limited to concrete
7245 types. This helps retain the potentially-important "parametricity"
7246 property: generic code cannot behave differently for different type
7247 arguments except in minor ways.
7248 * The `unsafe_destructor` feature is now deprecated in favor of the
7249 [new `dropck`][dropck]. This change is a major reduction in unsafe
7255 * The `thread_local` module [has been renamed to `std::thread`][th].
7256 * The methods of `IteratorExt` [have been moved to the `Iterator`
7258 * Several traits that implement Rust's conventions for type
7259 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7260 [centralized in the `std::convert` module][con].
7261 * The `FromError` trait [was removed in favor of `From`][fe].
7262 * The basic sleep function [has moved to
7263 `std::thread::sleep_ms`][slp].
7264 * The `splitn` function now takes an `n` parameter that represents the
7265 number of items yielded by the returned iterator [instead of the
7266 number of 'splits'][spl].
7267 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7268 * [Derived implementations of `PartialOrd` now order enums according
7269 to their explicitly-assigned discriminants][po].
7270 * [Methods for searching strings are generic over `Pattern`s][pat],
7271 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7273 * [In method resolution, object methods are resolved before inherent
7275 * [`String::from_str` has been deprecated in favor of the `From` impl,
7276 `String::from`][sf].
7277 * [`io::Error` implements `Sync`][ios].
7278 * [The `words` method on `&str` has been replaced with
7279 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7281 * The new path and IO modules are complete and `#[stable]`. This
7282 was the major library focus for this cycle.
7283 * The path API was [revised][path-normalize] to normalize `.`,
7284 adjusting the tradeoffs in favor of the most common usage.
7285 * A large number of remaining APIs in `std` were also stabilized
7286 during this cycle; about 75% of the non-deprecated API surface
7288 * The new [string pattern API][string-pattern] landed, which makes
7289 the string slice API much more internally consistent and flexible.
7290 * A new set of [generic conversion traits][conversion] replaced
7291 many existing ad hoc traits.
7292 * Generic numeric traits were [completely removed][num-traits]. This
7293 was made possible thanks to inherent methods for primitive types,
7294 and the removal gives maximal flexibility for designing a numeric
7295 hierarchy in the future.
7296 * The `Fn` traits are now related via [inheritance][fn-inherit]
7297 and provide ergonomic [blanket implementations][fn-blanket].
7298 * The `Index` and `IndexMut` traits were changed to
7299 [take the index by value][index-value], enabling code like
7300 `hash_map["string"]` to work.
7301 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7302 `Copy` data is known to be `Clone` as well.
7307 * Many errors now have extended explanations that can be accessed with
7308 the `--explain` flag to `rustc`.
7309 * Many new examples have been added to the standard library
7311 * rustdoc has received a number of improvements focused on completion
7313 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7314 * Much headway was made on ecosystem-wide CI, making it possible
7315 to [compare builds for breakage][ci-compare].
7318 [crates.io]: http://crates.io
7319 [clo]: https://github.com/rust-lang/rust/pull/24034
7320 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7321 [con]: https://github.com/rust-lang/rust/pull/23875
7322 [cr]: https://github.com/rust-lang/rust/pull/23419
7323 [fe]: https://github.com/rust-lang/rust/pull/23879
7324 [ie]: https://github.com/rust-lang/rust/pull/23300
7325 [inv]: https://github.com/rust-lang/rust/pull/23938
7326 [ios]: https://github.com/rust-lang/rust/pull/24133
7327 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7328 [lt]: https://github.com/rust-lang/rust/pull/24057
7329 [meth]: https://github.com/rust-lang/rust/pull/24056
7330 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7331 [po]: https://github.com/rust-lang/rust/pull/24270
7332 [sf]: https://github.com/rust-lang/rust/pull/24517
7333 [slp]: https://github.com/rust-lang/rust/pull/23949
7334 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7335 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7336 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7337 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7338 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7339 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7340 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7341 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7342 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7343 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7344 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7345 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7346 [reflect]: https://github.com/rust-lang/rust/pull/23712
7347 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7348 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7349 [index-value]: https://github.com/rust-lang/rust/pull/23601
7350 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7351 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7352 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7353 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7354 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7355 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7358 Version 1.0.0-alpha.2 (2015-02-20)
7359 =====================================
7361 * ~1300 changes, numerous bugfixes
7365 * The various I/O modules were [overhauled][io-rfc] to reduce
7366 unnecessary abstractions and provide better interoperation with
7367 the underlying platform. The old `io` module remains temporarily
7369 * The standard library now [participates in feature gating][feat],
7370 so use of unstable libraries now requires a `#![feature(...)]`
7371 attribute. The impact of this change is [described on the
7372 forum][feat-forum]. [RFC][feat-rfc].
7376 * `for` loops [now operate on the `IntoIterator` trait][into],
7377 which eliminates the need to call `.iter()`, etc. to iterate
7378 over collections. There are some new subtleties to remember
7379 though regarding what sort of iterators various types yield, in
7380 particular that `for foo in bar { }` yields values from a move
7381 iterator, destroying the original collection. [RFC][into-rfc].
7382 * Objects now have [default lifetime bounds][obj], so you don't
7383 have to write `Box<Trait+'static>` when you don't care about
7384 storing references. [RFC][obj-rfc].
7385 * In types that implement `Drop`, [lifetimes must outlive the
7386 value][drop]. This will soon make it possible to safely
7387 implement `Drop` for types where `#[unsafe_destructor]` is now
7388 required. Read the [gorgeous RFC][drop-rfc] for details.
7389 * The fully qualified <T as Trait>::X syntax lets you set the Self
7390 type for a trait method or associated type. [RFC][ufcs-rfc].
7391 * References to types that implement `Deref<U>` now [automatically
7392 coerce to references][deref] to the dereferenced type `U`,
7393 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7394 should eliminate many unsightly uses of `&*`, as when converting
7395 from references to vectors into references to
7396 slices. [RFC][deref-rfc].
7397 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7398 `|:|`) is obsolete and closure kind is inferred from context.
7399 * [`Self` is a keyword][Self].
7403 * The `Show` and `String` formatting traits [have been
7404 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7405 their related purposes. Automatically getting a string
7406 conversion to use with `format!("{:?}", something_to_debug)` is
7407 now written `#[derive(Debug)]`.
7408 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7409 OsStr}`, provide strings in platform-specific encodings for easier
7410 interop with system APIs. [RFC][osstr-rfc].
7411 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7412 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7413 creating raw pointers.
7417 * Certain long error messages of the form 'expected foo found bar'
7418 are now [split neatly across multiple
7419 lines][multiline]. Examples in the PR.
7420 * On Unix Rust can be [uninstalled][un] by running
7421 `/usr/local/lib/rustlib/uninstall.sh`.
7422 * The `#[rustc_on_unimplemented]` attribute, requiring the
7423 'on_unimplemented' feature, lets rustc [display custom error
7424 messages when a trait is expected to be implemented for a type
7429 * Rust is tested against a [LALR grammar][lalr], which parses
7430 almost all the Rust files that rustc does.
7432 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7433 [close]: https://github.com/rust-lang/rust/pull/21843
7434 [deref]: https://github.com/rust-lang/rust/pull/21351
7435 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7436 [drop]: https://github.com/rust-lang/rust/pull/21972
7437 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7438 [feat]: https://github.com/rust-lang/rust/pull/21248
7439 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7440 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7441 [fmt]: https://github.com/rust-lang/rust/pull/21457
7442 [into]: https://github.com/rust-lang/rust/pull/20790
7443 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7444 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7445 [lalr]: https://github.com/rust-lang/rust/pull/21452
7446 [multiline]: https://github.com/rust-lang/rust/pull/19870
7447 [obj]: https://github.com/rust-lang/rust/pull/22230
7448 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7449 [onun]: https://github.com/rust-lang/rust/pull/20889
7450 [osstr]: https://github.com/rust-lang/rust/pull/21488
7451 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7452 [Self]: https://github.com/rust-lang/rust/pull/22158
7453 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7454 [un]: https://github.com/rust-lang/rust/pull/22256
7457 Version 1.0.0-alpha (2015-01-09)
7458 ==================================
7460 * ~2400 changes, numerous bugfixes
7464 * The language itself is considered feature complete for 1.0,
7465 though there will be many usability improvements and bugfixes
7466 before the final release.
7467 * Nearly 50% of the public API surface of the standard library has
7468 been declared 'stable'. Those interfaces are unlikely to change
7470 * The long-running debate over integer types has been
7471 [settled][ints]: Rust will ship with types named `isize` and
7472 `usize`, rather than `int` and `uint`, for pointer-sized
7473 integers. Guidelines will be rolled out during the alpha cycle.
7474 * Most crates that are not `std` have been moved out of the Rust
7475 distribution into the Cargo ecosystem so they can evolve
7476 separately and don't need to be stabilized as quickly, including
7477 'time', 'getopts', 'num', 'regex', and 'term'.
7478 * Documentation continues to be expanded with more API coverage, more
7479 examples, and more in-depth explanations. The guides have been
7480 consolidated into [The Rust Programming Language][trpl].
7481 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7482 * All official Rust binary installers now come with [Cargo], the
7483 Rust package manager.
7487 * Closures have been [completely redesigned][unboxed] to be
7488 implemented in terms of traits, can now be used as generic type
7489 bounds and thus monomorphized and inlined, or via an opaque
7490 pointer (boxed) as in the old system. The new system is often
7491 referred to as 'unboxed' closures.
7492 * Traits now support [associated types][assoc], allowing families
7493 of related types to be defined together and used generically in
7495 * Enum variants are [namespaced by their type names][enum].
7496 * [`where` clauses][where] provide a more versatile and attractive
7497 syntax for specifying generic bounds, though the previous syntax
7499 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7501 * Rust [no longer has a runtime][rt] of any description, and only
7502 supports OS threads, not green threads.
7503 * At long last, Rust has been overhauled for 'dynamically-sized
7504 types' ([DST]), which integrates 'fat pointers' (object types,
7505 arrays, and `str`) more deeply into the type system, making it
7507 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7508 `..j` that produce range types and which, when combined with the
7509 `Index` operator and multidispatch, leads to a convenient slice
7511 * The new range syntax revealed an ambiguity in the fixed-length
7512 array syntax, so now fixed length arrays [are written `[T;
7514 * The `Copy` trait is no longer implemented automatically. Unsafe
7515 pointers no longer implement `Sync` and `Send` so types
7516 containing them don't automatically either. `Sync` and `Send`
7517 are now 'unsafe traits' so one can "forcibly" implement them via
7518 `unsafe impl` if a type confirms to the requirements for them
7519 even though the internals do not (e.g. structs containing unsafe
7520 pointers like `Arc`). These changes are intended to prevent some
7521 footguns and are collectively known as [opt-in built-in
7522 traits][oibit] (though `Sync` and `Send` will soon become pure
7523 library types unknown to the compiler).
7524 * Operator traits now take their operands [by value][ops], and
7525 comparison traits can use multidispatch to compare one type
7526 against multiple other types, allowing e.g. `String` to be
7527 compared with `&str`.
7528 * `if let` and `while let` are no longer feature-gated.
7529 * Rust has adopted a more [uniform syntax for escaping unicode
7530 characters][unicode].
7531 * `macro_rules!` [has been declared stable][mac]. Though it is a
7532 flawed system it is sufficiently popular that it must be usable
7533 for 1.0. Effort has gone into [future-proofing][mac-future] it
7534 in ways that will allow other macro systems to be developed in
7535 parallel, and won't otherwise impact the evolution of the
7537 * The prelude has been [pared back significantly][prelude] such
7538 that it is the minimum necessary to support the most pervasive
7539 code patterns, and through [generalized where clauses][where]
7540 many of the prelude extension traits have been consolidated.
7541 * Rust's rudimentary reflection [has been removed][refl], as it
7542 incurred too much code generation for little benefit.
7543 * [Struct variants][structvars] are no longer feature-gated.
7544 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7545 known as 'higher-ranked trait bounds', this crucially allows
7546 unboxed closures to work.
7547 * Macros invocations surrounded by parens or square brackets and
7548 not terminated by a semicolon are [parsed as
7549 expressions][macros], which makes expressions like `vec![1i32,
7550 2, 3].len()` work as expected.
7551 * Trait objects now implement their traits automatically, and
7552 traits that can be coerced to objects now must be [object
7554 * Automatically deriving traits is now done with `#[derive(...)]`
7555 not `#[deriving(...)]` for [consistency with other naming
7556 conventions][derive].
7557 * Importing the containing module or enum at the same time as
7558 items or variants they contain is [now done with `self` instead
7559 of `mod`][self], as in use `foo::{self, bar}`
7560 * Glob imports are no longer feature-gated.
7561 * The `box` operator and `box` patterns have been feature-gated
7562 pending a redesign. For now unique boxes should be allocated
7563 like other containers, with `Box::new`.
7567 * A [series][coll1] of [efforts][coll2] to establish
7568 [conventions][coll3] for collections types has resulted in API
7569 improvements throughout the standard library.
7570 * New [APIs for error handling][err] provide ergonomic interop
7571 between error types, and [new conventions][err-conv] describe
7572 more clearly the recommended error handling strategies in Rust.
7573 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7574 it is easier to discuss failure in the context of error handling
7575 without making clarifications as to whether you are referring to
7576 the 'fail' macro or failure more generally.
7577 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7578 syscall when available.
7579 * The 'serialize' crate has been renamed 'rustc-serialize' and
7580 moved out of the distribution to Cargo. Although it is widely
7581 used now, it is expected to be superseded in the near future.
7582 * The `Show` formatter, typically implemented with
7583 `#[derive(Show)]` is [now requested with the `{:?}`
7584 specifier][show] and is intended for use by all types, for uses
7585 such as `println!` debugging. The new `String` formatter must be
7586 implemented by hand, uses the `{}` specifier, and is intended
7587 for full-fidelity conversions of things that can logically be
7588 represented as strings.
7592 * [Flexible target specification][flex] allows rustc's code
7593 generation to be configured to support otherwise-unsupported
7595 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7596 respective debuggers with Rust-appropriate pretty-printing.
7597 * The Windows installation of Rust is distributed with the
7598 MinGW components currently required to link binaries on that
7603 * Nullable enum optimizations have been extended to more types so
7604 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7605 space than the inner types themselves.
7606 * Work has begun on supporting AArch64.
7608 [Cargo]: https://crates.io
7609 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7610 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7611 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7612 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7613 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7614 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7615 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7616 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7617 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7618 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7619 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7620 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7621 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7622 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7623 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7624 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7625 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7626 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7627 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7628 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7629 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7630 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7631 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7632 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7633 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7634 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7635 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7636 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7637 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7638 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7639 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7640 [trpl]: https://doc.rust-lang.org/book/index.html
7641 [rbe]: http://rustbyexample.com/
7644 Version 0.12.0 (2014-10-09)
7645 =============================
7647 * ~1900 changes, numerous bugfixes
7651 * The introductory documentation (now called The Rust Guide) has
7652 been completely rewritten, as have a number of supplementary
7654 * Rust's package manager, Cargo, continues to improve and is
7655 sometimes considered to be quite awesome.
7656 * Many API's in `std` have been reviewed and updated for
7657 consistency with the in-development Rust coding
7658 guidelines. The standard library documentation tracks
7659 stabilization progress.
7660 * Minor libraries have been moved out-of-tree to the rust-lang org
7661 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7662 be installed with Cargo.
7663 * Lifetime elision allows lifetime annotations to be left off of
7664 function declarations in many common scenarios.
7665 * Rust now works on 64-bit Windows.
7668 * Indexing can be overloaded with the `Index` and `IndexMut`
7670 * The `if let` construct takes a branch only if the `let` pattern
7671 matches, currently behind the 'if_let' feature gate.
7672 * 'where clauses', a more flexible syntax for specifying trait
7673 bounds that is more aesthetic, have been added for traits and
7674 free functions. Where clauses will in the future make it
7675 possible to constrain associated types, which would be
7676 impossible with the existing syntax.
7677 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7678 the 'slicing_syntax' feature gate, and can be overloaded with
7679 the `Slice` or `SliceMut` traits.
7680 * The syntax for matching of sub-slices has been changed to use a
7681 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7682 consistency with other uses of `..` and to future-proof
7683 potential additional uses of the syntax.
7684 * The syntax for matching inclusive ranges in patterns has changed
7685 from `0..3` to `0...4` to be consistent with the exclusive range
7687 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7688 c]`) has been put behind the 'advanced_slice_patterns' feature
7689 gate and may be removed in the future.
7690 * Components of tuples and tuple structs can be extracted using
7691 the `value.0` syntax, currently behind the `tuple_indexing`
7693 * The `#[crate_id]` attribute is no longer supported; versioning
7694 is handled by the package manager.
7695 * Renaming crate imports are now written `extern crate foo as bar`
7696 instead of `extern crate bar = foo`.
7697 * Renaming use statements are now written `use foo as bar` instead
7699 * `let` and `match` bindings and argument names in macros are now
7701 * The new, more efficient, closure types ('unboxed closures') have
7702 been added under a feature gate, 'unboxed_closures'. These will
7703 soon replace the existing closure types, once higher-ranked
7704 trait lifetimes are added to the language.
7705 * `move` has been added as a keyword, for indicating closures
7706 that capture by value.
7707 * Mutation and assignment is no longer allowed in pattern guards.
7708 * Generic structs and enums can now have trait bounds.
7709 * The `Share` trait is now called `Sync` to free up the term
7710 'shared' to refer to 'shared reference' (the default reference
7712 * Dynamically-sized types have been mostly implemented,
7713 unifying the behavior of fat-pointer types with the rest of the
7715 * As part of dynamically-sized types, the `Sized` trait has been
7716 introduced, which qualifying types implement by default, and
7717 which type parameters expect by default. To specify that a type
7718 parameter does not need to be sized, write `<Sized? T>`. Most
7719 types are `Sized`, notable exceptions being unsized arrays
7720 (`[T]`) and trait types.
7721 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7722 * Lifetime bounds can now be applied to type parameters and object
7724 * The old, reference counted GC type, `Gc<T>` which was once
7725 denoted by the `@` sigil, has finally been removed. GC will be
7726 revisited in the future.
7729 * Library documentation has been improved for a number of modules.
7730 * Bit-vectors, collections::bitv has been modernized.
7731 * The url crate is deprecated in favor of
7732 http://github.com/servo/rust-url, which can be installed with
7734 * Most I/O stream types can be cloned and subsequently closed from
7736 * A `std::time::Duration` type has been added for use in I/O
7737 methods that rely on timers, as well as in the 'time' crate's
7738 `Timespec` arithmetic.
7739 * The runtime I/O abstraction layer that enabled the green thread
7740 scheduler to do non-thread-blocking I/O has been removed, along
7741 with the libuv-based implementation employed by the green thread
7742 scheduler. This will greatly simplify the future I/O work.
7743 * `collections::btree` has been rewritten to have a more
7744 idiomatic and efficient design.
7747 * rustdoc output now indicates the stability levels of API's.
7748 * The `--crate-name` flag can specify the name of the crate
7749 being compiled, like `#[crate_name]`.
7750 * The `-C metadata` specifies additional metadata to hash into
7751 symbol names, and `-C extra-filename` specifies additional
7752 information to put into the output filename, for use by the
7753 package manager for versioning.
7754 * debug info generation has continued to improve and should be
7755 more reliable under both gdb and lldb.
7756 * rustc has experimental support for compiling in parallel
7757 using the `-C codegen-units` flag.
7758 * rustc no longer encodes rpath information into binaries by
7762 * Stack usage has been optimized with LLVM lifetime annotations.
7763 * Official Rust binaries on Linux are more compatible with older
7764 kernels and distributions, built on CentOS 5.10.
7767 Version 0.11.0 (2014-07-02)
7768 ==========================
7770 * ~1700 changes, numerous bugfixes
7773 * ~[T] has been removed from the language. This type is superseded by
7775 * ~str has been removed from the language. This type is superseded by
7777 * ~T has been removed from the language. This type is superseded by the
7779 * @T has been removed from the language. This type is superseded by the
7780 standard library's std::gc::Gc<T> type.
7781 * Struct fields are now all private by default.
7782 * Vector indices and shift amounts are both required to be a `uint`
7783 instead of any integral type.
7784 * Byte character, byte string, and raw byte string literals are now all
7785 supported by prefixing the normal literal with a `b`.
7786 * Multiple ABIs are no longer allowed in an ABI string
7787 * The syntax for lifetimes on closures/procedures has been tweaked
7788 slightly: `<'a>|A, B|: 'b + K -> T`
7789 * Floating point modulus has been removed from the language; however it
7790 is still provided by a library implementation.
7791 * Private enum variants are now disallowed.
7792 * The `priv` keyword has been removed from the language.
7793 * A closure can no longer be invoked through a &-pointer.
7794 * The `use foo, bar, baz;` syntax has been removed from the language.
7795 * The transmute intrinsic no longer works on type parameters.
7796 * Statics now allow blocks/items in their definition.
7797 * Trait bounds are separated from objects with + instead of : now.
7798 * Objects can no longer be read while they are mutably borrowed.
7799 * The address of a static is now marked as insignificant unless the
7800 #[inline(never)] attribute is placed it.
7801 * The #[unsafe_destructor] attribute is now behind a feature gate.
7802 * Struct literals are no longer allowed in ambiguous positions such as
7803 if, while, match, and for..in.
7804 * Declaration of lang items and intrinsics are now feature-gated by
7806 * Integral literals no longer default to `int`, and floating point
7807 literals no longer default to `f64`. Literals must be suffixed with an
7808 appropriate type if inference cannot determine the type of the
7810 * The Box<T> type is no longer implicitly borrowed to &mut T.
7811 * Procedures are now required to not capture borrowed references.
7814 * The standard library is now a "facade" over a number of underlying
7815 libraries. This means that development on the standard library should
7816 be speedier due to smaller crates, as well as a clearer line between
7818 * A new library, libcore, lives under the standard library's facade
7819 which is Rust's "0-assumption" library, suitable for embedded and
7820 kernel development for example.
7821 * A regex crate has been added to the standard distribution. This crate
7822 includes statically compiled regular expressions.
7823 * The unwrap/unwrap_err methods on Result require a Show bound for
7824 better error messages.
7825 * The return types of the std::comm primitives have been centralized
7826 around the Result type.
7827 * A number of I/O primitives have gained the ability to time out their
7829 * A number of I/O primitives have gained the ability to close their
7830 reading/writing halves to cancel pending operations.
7831 * Reverse iterator methods have been removed in favor of `rev()` on
7832 their forward-iteration counterparts.
7833 * A bitflags! macro has been added to enable easy interop with C and
7834 management of bit flags.
7835 * A debug_assert! macro is now provided which is disabled when
7836 `--cfg ndebug` is passed to the compiler.
7837 * A graphviz crate has been added for creating .dot files.
7838 * The std::cast module has been migrated into std::mem.
7839 * The std::local_data api has been migrated from freestanding functions
7840 to being based on methods.
7841 * The Pod trait has been renamed to Copy.
7842 * jemalloc has been added as the default allocator for types.
7843 * The API for allocating memory has been changed to use proper alignment
7844 and sized deallocation
7845 * Connecting a TcpStream or binding a TcpListener is now based on a
7846 string address and a u16 port. This allows connecting to a hostname as
7848 * The Reader trait now contains a core method, read_at_least(), which
7849 correctly handles many repeated 0-length reads.
7850 * The process-spawning API is now centered around a builder-style
7852 * The :? printing qualifier has been moved from the standard library to
7853 an external libdebug crate.
7854 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
7855 have been renamed to Eq/Ord.
7856 * The select/plural methods have been removed from format!. The escapes
7857 for { and } have also changed from \{ and \} to {{ and }},
7859 * The TaskBuilder API has been re-worked to be a true builder, and
7860 extension traits for spawning native/green tasks have been added.
7863 * All breaking changes to the language or libraries now have their
7864 commit message annotated with `[breaking-change]` to allow for easy
7865 discovery of breaking changes.
7866 * The compiler will now try to suggest how to annotate lifetimes if a
7867 lifetime-related error occurs.
7868 * Debug info continues to be improved greatly with general bug fixes and
7869 better support for situations like link time optimization (LTO).
7870 * Usage of syntax extensions when cross-compiling has been fixed.
7871 * Functionality equivalent to GCC & Clang's -ffunction-sections,
7872 -fdata-sections and --gc-sections has been enabled by default
7873 * The compiler is now stricter about where it will load module files
7874 from when a module is declared via `mod foo;`.
7875 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
7876 Syntax extensions are now discovered via a "plugin registrar" type
7877 which will be extended in the future to other various plugins.
7878 * Lints have been restructured to allow for dynamically loadable lints.
7879 * A number of rustdoc improvements:
7880 * The HTML output has been visually redesigned.
7881 * Markdown is now powered by hoedown instead of sundown.
7882 * Searching heuristics have been greatly improved.
7883 * The search index has been reduced in size by a great amount.
7884 * Cross-crate documentation via `pub use` has been greatly improved.
7885 * Primitive types are now hyperlinked and documented.
7886 * Documentation has been moved from static.rust-lang.org/doc to
7888 * A new sandbox, play.rust-lang.org, is available for running and
7889 sharing rust code examples on-line.
7890 * Unused attributes are now more robustly warned about.
7891 * The dead_code lint now warns about unused struct fields.
7892 * Cross-compiling to iOS is now supported.
7893 * Cross-compiling to mipsel is now supported.
7894 * Stability attributes are now inherited by default and no longer apply
7895 to intra-crate usage, only inter-crate usage.
7896 * Error message related to non-exhaustive match expressions have been
7900 Version 0.10 (2014-04-03)
7901 =========================
7903 * ~1500 changes, numerous bugfixes
7906 * A new RFC process is now in place for modifying the language.
7907 * Patterns with `@`-pointers have been removed from the language.
7908 * Patterns with unique vectors (`~[T]`) have been removed from the
7910 * Patterns with unique strings (`~str`) have been removed from the
7912 * `@str` has been removed from the language.
7913 * `@[T]` has been removed from the language.
7914 * `@self` has been removed from the language.
7915 * `@Trait` has been removed from the language.
7916 * Headers on `~` allocations which contain `@` boxes inside the type for
7917 reference counting have been removed.
7918 * The semantics around the lifetimes of temporary expressions have changed,
7919 see #3511 and #11585 for more information.
7920 * Cross-crate syntax extensions are now possible, but feature gated. See
7921 #11151 for more information. This includes both `macro_rules!` macros as
7922 well as syntax extensions such as `format!`.
7923 * New lint modes have been added, and older ones have been turned on to be
7925 * Unnecessary parentheses
7928 * Uppercase variables
7929 * Publicly visible private types
7930 * `#[deriving]` with raw pointers
7931 * Unsafe functions can no longer be coerced to closures.
7932 * Various obscure macros such as `log_syntax!` are now behind feature gates.
7933 * The `#[simd]` attribute is now behind a feature gate.
7934 * Visibility is no longer allowed on `extern crate` statements, and
7935 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
7936 * Trailing commas are now allowed in argument lists and tuple patterns.
7937 * The `do` keyword has been removed, it is now a reserved keyword.
7938 * Default type parameters have been implemented, but are feature gated.
7939 * Borrowed variables through captures in closures are now considered soundly.
7940 * `extern mod` is now `extern crate`
7941 * The `Freeze` trait has been removed.
7942 * The `Share` trait has been added for types that can be shared among
7944 * Labels in macros are now hygienic.
7945 * Expression/statement macro invocations can be delimited with `{}` now.
7946 * Treatment of types allowed in `static mut` locations has been tweaked.
7947 * The `*` and `.` operators are now overloadable through the `Deref` and
7949 * `~Trait` and `proc` no longer have `Send` bounds by default.
7950 * Partial type hints are now supported with the `_` type marker.
7951 * An `Unsafe` type was introduced for interior mutability. It is now
7952 considered undefined to transmute from `&T` to `&mut T` without using the
7954 * The #[linkage] attribute was implemented for extern statics/functions.
7955 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
7956 * `Pod` was renamed to `Copy`.
7959 * The `libextra` library has been removed. It has now been decomposed into
7960 component libraries with smaller and more focused nuggets of
7961 functionality. The full list of libraries can be found on the
7962 documentation index page.
7963 * std: `std::condition` has been removed. All I/O errors are now propagated
7964 through the `Result` type. In order to assist with error handling, a
7965 `try!` macro for unwrapping errors with an early return and a lint for
7966 unused results has been added. See #12039 for more information.
7967 * std: The `vec` module has been renamed to `slice`.
7968 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
7969 This will become the only growable vector in the future.
7970 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
7971 are now found at `std::io::BufferedReader` instead of
7972 `std::io::buffered::BufferedReader`.
7973 * std: `print` and `println` are no longer in the prelude, the `print!` and
7974 `println!` macros are intended to be used instead.
7975 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
7976 attempts to statically prevent cycles.
7977 * std: The standard distribution is adopting the policy of pushing failure
7978 to the user rather than failing in libraries. Many functions (such as
7979 `slice::last()`) now return `Option<T>` instead of `T` + failing.
7980 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
7981 deriving mode: `#[deriving(Show)]`.
7982 * std: `ToStr` is now implemented for all types implementing `Show`.
7983 * std: The formatting trait methods now take `&self` instead of `&T`
7984 * std: The `invert()` method on iterators has been renamed to `rev()`
7985 * std: `std::num` has seen a reduction in the genericity of its traits,
7986 consolidating functionality into a few core traits.
7987 * std: Backtraces are now printed on task failure if the environment
7988 variable `RUST_BACKTRACE` is present.
7989 * std: Naming conventions for iterators have been standardized. More details
7990 can be found on the wiki's style guide.
7991 * std: `eof()` has been removed from the `Reader` trait. Specific types may
7992 still implement the function.
7993 * std: Networking types are now cloneable to allow simultaneous reads/writes.
7994 * std: `assert_approx_eq!` has been removed
7995 * std: The `e` and `E` formatting specifiers for floats have been added to
7996 print them in exponential notation.
7997 * std: The `Times` trait has been removed
7998 * std: Indications of variance and opting out of builtin bounds is done
7999 through marker types in `std::kinds::marker` now
8000 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8001 `#[deriving(Hash)]` is now possible.
8002 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8003 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8004 * std: `Chan::new` is now `channel()`.
8005 * std: A new synchronous channel type has been implemented.
8006 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8007 * std: `hashmap` and `trie` have been moved to `libcollections`
8008 * std: `run` has been rolled into `io::process`
8009 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8010 * std: The equality and comparison traits have seen some reorganization.
8011 * std: `rand` has moved to `librand`.
8012 * std: `to_{lower,upper}case` has been implemented for `char`.
8013 * std: Logging has been moved to `liblog`.
8014 * collections: `HashMap` has been rewritten for higher performance and less
8016 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8017 it can be booted manually. The runtime guide has more information and
8019 * native: All I/O functionality except signals has been implemented.
8020 * green: Task spawning with `libgreen` has been optimized with stack caching
8021 and various trimming of code.
8022 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8023 * sync: The `extra::sync` module has been updated to modern rust (and moved
8024 to the `sync` library), tweaking and improving various interfaces while
8025 dropping redundant functionality.
8026 * sync: A new `Barrier` type has been added to the `sync` library.
8027 * sync: An efficient mutex for native and green tasks has been implemented.
8028 * serialize: The `base64` module has seen some improvement. It treats
8029 newlines better, has non-string error values, and has seen general
8031 * fourcc: A `fourcc!` macro was introduced
8032 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8033 hexadecimal literal.
8036 * `rustpkg` has been deprecated and removed from the main repository. Its
8037 replacement, `cargo`, is under development.
8038 * Nightly builds of rust are now available
8039 * The memory usage of rustc has been improved many times throughout this
8041 * The build process supports disabling rpath support for the rustc binary
8043 * Code generation has improved in some cases, giving more information to the
8044 LLVM optimization passes to enable more extensive optimizations.
8045 * Debuginfo compatibility with lldb on OSX has been restored.
8046 * The master branch is now gated on an android bot, making building for
8047 android much more reliable.
8048 * Output flags have been centralized into one `--emit` flag.
8049 * Crate type flags have been centralized into one `--crate-type` flag.
8050 * Codegen flags have been consolidated behind a `-C` flag.
8051 * Linking against outdated crates now has improved error messages.
8052 * Error messages with lifetimes will often suggest how to annotate the
8053 function to fix the error.
8054 * Many more types are documented in the standard library, and new guides
8056 * Many `rustdoc` improvements:
8057 * code blocks are syntax highlighted.
8058 * render standalone markdown files.
8059 * the --test flag tests all code blocks by default.
8060 * exported macros are displayed.
8061 * re-exported types have their documentation inlined at the location of the
8063 * search works across crates that have been rendered to the same output
8067 Version 0.9 (2014-01-09)
8068 ==========================
8070 * ~1800 changes, numerous bugfixes
8073 * The `float` type has been removed. Use `f32` or `f64` instead.
8074 * A new facility for enabling experimental features (feature gating) has
8075 been added, using the crate-level `#[feature(foo)]` attribute.
8076 * Managed boxes (@) are now behind a feature gate
8077 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8078 standard library's `Gc` or `Rc` types instead.
8079 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8080 * Jumping back to the top of a loop is now done with `continue` instead of
8082 * Strings can no longer be mutated through index assignment.
8083 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8084 hash delimiters, as in `r###"foo"###`.
8085 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8087 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8088 * `@fn`s have been removed.
8089 * `do` only works with procs in order to make it obvious what the cost
8091 * Single-element tuple-like structs can no longer be dereferenced to
8092 obtain the inner value. A more comprehensive solution for overloading
8093 the dereference operator will be provided in the future.
8094 * The `#[link(...)]` attribute has been replaced with
8095 `#[crate_id = "name#vers"]`.
8096 * Empty `impl`s must be terminated with empty braces and may not be
8097 terminated with a semicolon.
8098 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8099 no longer has any special meaning.
8100 * The old `fmt!` string formatting macro has been removed.
8101 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8102 `print!` and `println!`.
8103 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8104 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8105 `extern mod foo = "bar"` instead.
8106 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8107 * Macros can have attributes.
8108 * Macros can expand to items with attributes.
8109 * Macros can expand to multiple items.
8110 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8111 * Comments may be nested.
8112 * Values automatically coerce to trait objects they implement, without
8114 * Enum discriminants are no longer an entire word but as small as needed to
8115 contain all the variants. The `repr` attribute can be used to override
8116 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8117 `#[repr(C)]` to match C enums.
8118 * Non-string literals are not allowed in attributes (they never worked).
8119 * The FFI now supports variadic functions.
8120 * Octal numeric literals, as in `0o7777`.
8121 * The `concat!` syntax extension performs compile-time string concatenation.
8122 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8123 removed as Rust no longer uses segmented stacks.
8124 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8125 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8126 not `*`; ignoring remaining fields of a struct is also done with `..`,
8127 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8128 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8129 * `rustc` supports the "system" calling convention, which defaults to the
8130 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8132 * The `type_overflow` lint (default: warn) checks literals for overflow.
8133 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8134 * The `attribute_usage` lint (default: warn) warns about unknown
8136 * The `unknown_features` lint (default: warn) warns about unknown
8138 * The `dead_code` lint (default: warn) checks for dead code.
8139 * Rust libraries can be linked statically to one another
8140 * `#[link_args]` is behind the `link_args` feature gate.
8141 * Native libraries are now linked with `#[link(name = "foo")]`
8142 * Native libraries can be statically linked to a rust crate
8143 (`#[link(name = "foo", kind = "static")]`).
8144 * Native OS X frameworks are now officially supported
8145 (`#[link(name = "foo", kind = "framework")]`).
8146 * The `#[thread_local]` attribute creates thread-local (not task-local)
8147 variables. Currently behind the `thread_local` feature gate.
8148 * The `return` keyword may be used in closures.
8149 * Types that can be copied via a memcpy implement the `Pod` kind.
8150 * The `cfg` attribute can now be used on struct fields and enum variants.
8153 * std: The `option` and `result` API's have been overhauled to make them
8154 simpler, more consistent, and more composable.
8155 * std: The entire `std::io` module has been replaced with one that is
8156 more comprehensive and that properly interfaces with the underlying
8157 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8159 * std: `io::util` contains a number of useful implementations of
8160 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8161 `ZeroReader`, `TeeReader`.
8162 * std: The reference counted pointer type `extra::rc` moved into std.
8163 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8164 just a wrapper around it).
8165 * std: The `Either` type has been removed.
8166 * std: `fmt::Default` can be implemented for any type to provide default
8167 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8168 * std: The `rand` API continues to be tweaked.
8169 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8170 on failure in gdb, is now named `rust_fail`.
8171 * std: The `each_key` and `each_value` methods on `HashMap` have been
8172 replaced by the `keys` and `values` iterators.
8173 * std: Functions dealing with type size and alignment have moved from the
8174 `sys` module to the `mem` module.
8175 * std: The `path` module was written and API changed.
8176 * std: `str::from_utf8` has been changed to cast instead of allocate.
8177 * std: `starts_with` and `ends_with` methods added to vectors via the
8178 `ImmutableEqVector` trait, which is in the prelude.
8179 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8180 if the index is out of bounds.
8181 * std: Task failure no longer propagates between tasks, as the model was
8182 complex, expensive, and incompatible with thread-based tasks.
8183 * std: The `Any` type can be used for dynamic typing.
8184 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8186 * std: Methods that produce iterators generally do not have an `_iter`
8188 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8189 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8190 * std: `util::ignore` renamed to `prelude::drop`.
8191 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8193 * std: `vec::raw` has seen a lot of cleanup and API changes.
8194 * std: The standard library no longer includes any C++ code, and very
8195 minimal C, eliminating the dependency on libstdc++.
8196 * std: Runtime scheduling and I/O functionality has been factored out into
8197 extensible interfaces and is now implemented by two different crates:
8198 libnative, for native threading and I/O; and libgreen, for green threading
8199 and I/O. This paves the way for using the standard library in more limited
8200 embedded environments.
8201 * std: The `comm` module has been rewritten to be much faster, have a
8202 simpler, more consistent API, and to work for both native and green
8204 * std: All libuv dependencies have been moved into the rustuv crate.
8205 * native: New implementations of runtime scheduling on top of OS threads.
8206 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8208 * green: The green thread scheduler and message passing types are almost
8210 * extra: The `flatpipes` module had bitrotted and was removed.
8211 * extra: All crypto functions have been removed and Rust now has a policy of
8212 not reimplementing crypto in the standard library. In the future crypto
8213 will be provided by external crates with bindings to established libraries.
8214 * extra: `c_vec` has been modernized.
8215 * extra: The `sort` module has been removed. Use the `sort` method on
8219 * The `rust` and `rusti` commands have been removed, due to lack of
8221 * `rustdoc` was completely rewritten.
8222 * `rustdoc` can test code examples in documentation.
8223 * `rustpkg` can test packages with the argument, 'test'.
8224 * `rustpkg` supports arbitrary dependencies, including C libraries.
8225 * `rustc`'s support for generating debug info is improved again.
8226 * `rustc` has better error reporting for unbalanced delimiters.
8227 * `rustc`'s JIT support was removed due to bitrot.
8228 * Executables and static libraries can be built with LTO (-Z lto)
8229 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8233 Version 0.8 (2013-09-26)
8234 ============================
8236 * ~2200 changes, numerous bugfixes
8239 * The `for` loop syntax has changed to work with the `Iterator` trait.
8240 * At long last, unwinding works on Windows.
8241 * Default methods are ready for use.
8242 * Many trait inheritance bugs fixed.
8243 * Owned and borrowed trait objects work more reliably.
8244 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8245 * rustc can omit emission of code for the `debug!` macro if it is passed
8247 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8248 for foo.rs, then foo/mod.rs, and will generate an error when both are
8250 * Strings no longer contain trailing nulls. The new `std::c_str` module
8251 provides new mechanisms for converting to C strings.
8252 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8253 * The FFI has been overhauled such that foreign functions are called directly,
8254 instead of through a stack-switching wrapper.
8255 * Calling a foreign function must be done through a Rust function with the
8256 `#[fixed_stack_segment]` attribute.
8257 * The `externfn!` macro can be used to declare both a foreign function and
8258 a `#[fixed_stack_segment]` wrapper at once.
8259 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8260 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8261 * `priv` is disallowed everywhere except for struct fields and enum variants.
8262 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8263 * `ref` bindings in irrefutable patterns work correctly now.
8264 * `char` is now prevented from containing invalid code points.
8265 * Casting to `bool` is no longer allowed.
8266 * `\0` is now accepted as an escape in chars and strings.
8267 * `yield` is a reserved keyword.
8268 * `typeof` is a reserved keyword.
8269 * Crates may be imported by URL with `extern mod foo = "url";`.
8270 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8271 * Static vectors can be initialized with repeating elements,
8272 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8273 * Static structs can be initialized with functional record update,
8274 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8275 * `cfg!` can be used to conditionally execute code based on the crate
8276 configuration, similarly to `#[cfg(...)]`.
8277 * The `unnecessary_qualification` lint detects unneeded module
8278 prefixes (default: allow).
8279 * Arithmetic operations have been implemented on the SIMD types in
8280 `std::unstable::simd`.
8281 * Exchange allocation headers were removed, reducing memory usage.
8282 * `format!` implements a completely new, extensible, and higher-performance
8283 string formatting system. It will replace `fmt!`.
8284 * `print!` and `println!` write formatted strings (using the `format!`
8285 extension) to stdout.
8286 * `write!` and `writeln!` write formatted strings (using the `format!`
8287 extension) to the new Writers in `std::rt::io`.
8288 * The library section in which a function or static is placed may
8289 be specified with `#[link_section = "..."]`.
8290 * The `proto!` syntax extension for defining bounded message protocols
8292 * `macro_rules!` is hygienic for `let` declarations.
8293 * The `#[export_name]` attribute specifies the name of a symbol.
8294 * `unreachable!` can be used to indicate unreachable code, and fails
8298 * std: Transitioned to the new runtime, written in Rust.
8299 * std: Added an experimental I/O library, `rt::io`, based on the new
8301 * std: A new generic `range` function was added to the prelude, replacing
8302 `uint::range` and friends.
8303 * std: `range_rev` no longer exists. Since range is an iterator it can be
8304 reversed with `range(lo, hi).invert()`.
8305 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8306 renamed to `unwrap_or`.
8307 * std: The `iterator` module was renamed to `iter`.
8308 * std: Integral types now support the `checked_add`, `checked_sub`, and
8309 `checked_mul` operations for detecting overflow.
8310 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8312 * std: Methods are standardizing on conventions for casting methods:
8313 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8315 * std: The `CString` type in `c_str` provides new ways to convert to and
8317 * std: `DoubleEndedIterator` can yield elements in two directions.
8318 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8320 * std: `str::from_bytes` renamed to `str::from_utf8`.
8321 * std: `pop_opt` and `shift_opt` methods added to vectors.
8322 * std: The task-local data interface no longer uses @, and keys are
8323 no longer function pointers.
8324 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8325 * std: Added `SharedPort` to `comm`.
8326 * std: `Eq` has a default method for `ne`; only `eq` is required
8328 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8329 is required in implementations.
8330 * std: `is_utf8` performance is improved, impacting many string functions.
8331 * std: `os::MemoryMap` provides cross-platform mmap.
8332 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8333 are not 'in-bounds' are considered undefined.
8334 * std: Many freestanding functions in `vec` removed in favor of methods.
8335 * std: Many freestanding functions on scalar types removed in favor of
8337 * std: Many options to task builders were removed since they don't make
8338 sense in the new scheduler design.
8339 * std: More containers implement `FromIterator` so can be created by the
8341 * std: More complete atomic types in `unstable::atomics`.
8342 * std: `comm::PortSet` removed.
8343 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8344 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8345 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8346 default implementations.
8347 * std: Various `from_str` functions were removed in favor of a generic
8348 `from_str` which is available in the prelude.
8349 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8350 * extra: `dlist`, the doubly-linked list was modernized.
8351 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8352 * extra: Added `glob` module, replacing `std::os::glob`.
8353 * extra: `rope` was removed.
8354 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8355 * extra: `net`, and `timer` were removed. The experimental replacements
8356 are `std::rt::io::net` and `std::rt::io::timer`.
8357 * extra: Iterators implemented for `SmallIntMap`.
8358 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8359 * extra: `SmallIntSet` removed. Use `BitvSet`.
8360 * extra: Performance of JSON parsing greatly improved.
8361 * extra: `semver` updated to SemVer 2.0.0.
8362 * extra: `term` handles more terminals correctly.
8363 * extra: `dbg` module removed.
8364 * extra: `par` module removed.
8365 * extra: `future` was cleaned up, with some method renames.
8366 * extra: Most free functions in `getopts` were converted to methods.
8369 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8370 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8371 similarly to gcc's `--march` flag.
8372 * rustc's performance compiling small crates is much better.
8373 * rustpkg has received many improvements.
8374 * rustpkg supports git tags as package IDs.
8375 * rustpkg builds into target-specific directories so it can be used for
8377 * The number of concurrent test tasks is controlled by the environment
8378 variable RUST_TEST_TASKS.
8379 * The test harness can now report metrics for benchmarks.
8380 * All tools have man pages.
8381 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8382 * The runtime uses jemalloc for allocations.
8383 * Segmented stacks are temporarily disabled as part of the transition to
8384 the new runtime. Stack overflows are possible!
8385 * A new documentation backend, rustdoc_ng, is available for use. It is
8386 still invoked through the normal `rustdoc` command.
8389 Version 0.7 (2013-07-03)
8390 =======================
8392 * ~2000 changes, numerous bugfixes
8395 * `impl`s no longer accept a visibility qualifier. Put them on methods
8397 * The borrow checker has been rewritten with flow-sensitivity, fixing
8398 many bugs and inconveniences.
8399 * The `self` parameter no longer implicitly means `&'self self`,
8400 and can be explicitly marked with a lifetime.
8401 * Overloadable compound operators (`+=`, etc.) have been temporarily
8402 removed due to bugs.
8403 * The `for` loop protocol now requires `for`-iterators to return `bool`
8404 so they compose better.
8405 * The `Durable` trait is replaced with the `'static` bounds.
8406 * Trait default methods work more often.
8407 * Structs with the `#[packed]` attribute have byte alignment and
8408 no padding between fields.
8409 * Type parameters bound by `Copy` must now be copied explicitly with
8411 * It is now illegal to move out of a dereferenced unsafe pointer.
8412 * `Option<~T>` is now represented as a nullable pointer.
8413 * `@mut` does dynamic borrow checks correctly.
8414 * The `main` function is only detected at the topmost level of the crate.
8415 The `#[main]` attribute is still valid anywhere.
8416 * Struct fields may no longer be mutable. Use inherited mutability.
8417 * The `#[no_send]` attribute makes a type that would otherwise be
8419 * The `#[no_freeze]` attribute makes a type that would otherwise be
8421 * Unbounded recursion will abort the process after reaching the limit
8422 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8423 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8424 are never implicitly copyable.
8425 * `#[static_assert]` makes compile-time assertions about static bools.
8426 * At long last, 'argument modes' no longer exist.
8427 * The rarely used `use mod` statement no longer exists.
8430 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8432 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8433 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8435 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8436 and unsuffixed integer literals.
8439 * The `core` crate was renamed to `std`.
8440 * The `std` crate was renamed to `extra`.
8441 * More and improved documentation.
8442 * std: `iterator` module for external iterator objects.
8443 * Many old-style (internal, higher-order function) iterators replaced by
8444 implementations of `Iterator`.
8445 * std: Many old internal vector and string iterators,
8446 incl. `any`, `all`. removed.
8447 * std: The `finalize` method of `Drop` renamed to `drop`.
8448 * std: The `drop` method now takes `&mut self` instead of `&self`.
8449 * std: The prelude no longer re-exports any modules, only types and traits.
8450 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8451 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8452 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8453 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8454 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8455 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8456 * std: Many types implement `Clone`.
8457 * std: `path` type renamed to `Path`.
8458 * std: `mut` module and `Mut` type removed.
8459 * std: Many standalone functions removed in favor of methods and iterators
8460 in `vec`, `str`. In the future methods will also work as functions.
8461 * std: `reinterpret_cast` removed. Use `transmute`.
8462 * std: ascii string handling in `std::ascii`.
8463 * std: `Rand` is implemented for ~/@.
8464 * std: `run` module for spawning processes overhauled.
8465 * std: Various atomic types added to `unstable::atomic`.
8466 * std: Various types implement `Zero`.
8467 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8468 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8469 * std: Added `os::mkdir_recursive`.
8470 * std: Added `os::glob` function performs filesystems globs.
8471 * std: `FuzzyEq` renamed to `ApproxEq`.
8472 * std: `Map` now defines `pop` and `swap` methods.
8473 * std: `Cell` constructors converted to static methods.
8474 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8475 * extra: `flate` module moved from `std` to `extra`.
8476 * extra: `fileinput` module for iterating over a series of files.
8477 * extra: `Complex` number type and `complex` module.
8478 * extra: `Rational` number type and `rational` module.
8479 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8480 * extra: `term` uses terminfo now, is more correct.
8481 * extra: `arc` functions converted to methods.
8482 * extra: Implementation of fixed output size variations of SHA-2.
8485 * `unused_variables` lint mode for unused variables (default: warn).
8486 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8488 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8490 * `dead_assignment` lint mode for unread variables (default: warn).
8491 * `unnecessary_allocation` lint mode detects some heap allocations that are
8492 immediately borrowed so could be written without allocating (default: warn).
8493 * `missing_doc` lint mode (default: allow).
8494 * `unreachable_code` lint mode (default: warn).
8495 * The `rusti` command has been rewritten and a number of bugs addressed.
8496 * rustc outputs in color on more terminals.
8497 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8498 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8499 * Compiling with `-g` will make the binary record information about
8500 dynamic borrowcheck failures for debugging.
8501 * rustdoc has a nicer stylesheet.
8502 * Various improvements to rustdoc.
8503 * Improvements to rustpkg (see the detailed release notes).
8506 Version 0.6 (2013-04-03)
8507 ========================
8509 * ~2100 changes, numerous bugfixes
8512 * The self type parameter in traits is now spelled `Self`
8513 * The `self` parameter in trait and impl methods must now be explicitly
8514 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8515 * Static methods no longer require the `static` keyword and instead
8516 are distinguished by the lack of a `self` parameter
8517 * Replaced the `Durable` trait with the `'static` lifetime
8518 * The old closure type syntax with the trailing sigil has been
8519 removed in favor of the more consistent leading sigil
8520 * `super` is a keyword, and may be prefixed to paths
8521 * Trait bounds are separated with `+` instead of whitespace
8522 * Traits are implemented with `impl Trait for Type`
8523 instead of `impl Type: Trait`
8524 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8525 * The `export` keyword has finally been removed
8526 * The `move` keyword has been removed (see "Semantic changes")
8527 * The interior mutability qualifier on vectors, `[mut T]`, has been
8528 removed. Use `&mut [T]`, etc.
8529 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8530 * `fail` is no longer a keyword. Use `fail!()`
8531 * `assert` is no longer a keyword. Use `assert!()`
8532 * `log` is no longer a keyword. use `debug!`, etc.
8533 * 1-tuples may be represented as `(T,)`
8534 * Struct fields may no longer be `mut`. Use inherited mutability,
8535 `@mut T`, `core::mut` or `core::cell`
8536 * `extern mod { ... }` is no longer valid syntax for foreign
8537 function modules. Use extern blocks: `extern { ... }`
8538 * Newtype enums removed. Use tuple-structs.
8539 * Trait implementations no longer support visibility modifiers
8540 * Pattern matching over vectors improved and expanded
8541 * `const` renamed to `static` to correspond to lifetime name,
8542 and make room for future `static mut` unsafe mutable globals.
8543 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8544 * `Clone` implementations can be automatically generated with
8545 `#[deriving(Clone)]`
8546 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8547 instead of `foo as Bar`.
8548 * Fixed length vector types are now written as `[int, .. 3]`
8549 instead of `[int * 3]`.
8550 * Fixed length vector types can express the length as a constant
8551 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8554 * Types with owned pointers or custom destructors move by default,
8555 eliminating the `move` keyword
8556 * All foreign functions are considered unsafe
8557 * &mut is now unaliasable
8558 * Writes to borrowed @mut pointers are prevented dynamically
8560 * The name of the main function can be customized using #[main]
8561 * The default type of an inferred closure is &fn instead of @fn
8562 * `use` statements may no longer be "chained" - they cannot import
8563 identifiers imported by previous `use` statements
8564 * `use` statements are crate relative, importing from the "top"
8565 of the crate by default. Paths may be prefixed with `super::`
8566 or `self::` to change the search behavior.
8567 * Method visibility is inherited from the implementation declaration
8568 * Structural records have been removed
8569 * Many more types can be used in static items, including enums
8570 'static-lifetime pointers and vectors
8571 * Pattern matching over vectors improved and expanded
8572 * Typechecking of closure types has been overhauled to
8573 improve inference and eliminate unsoundness
8574 * Macros leave scope at the end of modules, unless that module is
8575 tagged with #[macro_escape]
8578 * Added big integers to `std::bigint`
8579 * Removed `core::oldcomm` module
8580 * Added pipe-based `core::comm` module
8581 * Numeric traits have been reorganized under `core::num`
8582 * `vec::slice` finally returns a slice
8583 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8584 * Containers reorganized around traits in `core::container`
8585 * `core::dvec` removed, `~[T]` is a drop-in replacement
8586 * `core::send_map` renamed to `core::hashmap`
8587 * `std::map` removed; replaced with `core::hashmap`
8588 * `std::treemap` reimplemented as an owned balanced tree
8589 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8590 * `core::trie` added as a fast ordered map for integer keys
8591 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8592 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8593 overload the comparison operators, whereas `TotalOrd` is used
8594 by certain container types
8597 * Replaced the 'cargo' package manager with 'rustpkg'
8598 * Added all-purpose 'rust' tool
8599 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8600 * rustc now *attempts* to offer spelling suggestions
8601 * Improved support for ARM and Android
8602 * Preliminary MIPS backend
8603 * Improved foreign function ABI implementation for x86, x86_64
8604 * Various memory usage improvements
8605 * Rust code may be embedded in foreign code under limited circumstances
8606 * Inline assembler supported by new asm!() syntax extension.
8609 Version 0.5 (2012-12-21)
8610 ===========================
8612 * ~900 changes, numerous bugfixes
8615 * Removed `<-` move operator
8616 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8617 * Removed old fixed length vector syntax - `[T]/N`
8618 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8619 * Macros may now expand to items and statements
8620 * `a.b()` is always parsed as a method call, never as a field projection
8621 * `Eq` and `IterBytes` implementations can be automatically generated
8622 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8623 * Removed the special crate language for `.rc` files
8624 * Function arguments may consist of any irrefutable pattern
8627 * `&` and `~` pointers may point to objects
8628 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8629 * Enum variants may be structs
8630 * Destructors can be added to all nominal types with the Drop trait
8631 * Structs and nullary enum variants may be constants
8632 * Values that cannot be implicitly copied are now automatically moved
8633 without writing `move` explicitly
8634 * `&T` may now be coerced to `*T`
8635 * Coercions happen in `let` statements as well as function calls
8636 * `use` statements now take crate-relative paths
8637 * The module and type namespaces have been merged so that static
8638 method names can be resolved under the trait in which they are
8641 * Improved support for language features
8642 * Trait inheritance works in many scenarios
8643 * More support for explicit self arguments in methods - `self`, `&self`
8644 `@self`, and `~self` all generally work as expected
8645 * Static methods work in more situations
8646 * Experimental: Traits may declare default methods for the implementations
8650 * New condition handling system in `core::condition`
8651 * Timsort added to `std::sort`
8652 * New priority queue, `std::priority_queue`
8653 * Pipes for serializable types, `std::flatpipes'
8654 * Serialization overhauled to be trait-based
8655 * Expanded `getopts` definitions
8656 * Moved futures to `std`
8657 * More functions are pure now
8658 * `core::comm` renamed to `oldcomm`. Still deprecated
8659 * `rustdoc` and `cargo` are libraries now
8662 * Added a preliminary REPL, `rusti`
8663 * License changed from MIT to dual MIT/APL2
8666 Version 0.4 (2012-10-15)
8667 ==========================
8669 * ~2000 changes, numerous bugfixes
8672 * All keywords are now strict and may not be used as identifiers anywhere
8673 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8674 'of', 'with', 'to', 'class'.
8675 * Classes are replaced with simpler structs
8676 * Explicit method self types
8677 * `ret` became `return` and `alt` became `match`
8678 * `import` is now `use`; `use is now `extern mod`
8679 * `extern mod { ... }` is now `extern { ... }`
8680 * `use mod` is the recommended way to import modules
8681 * `pub` and `priv` replace deprecated export lists
8682 * The syntax of `match` pattern arms now uses fat arrow (=>)
8683 * `main` no longer accepts an args vector; use `os::args` instead
8686 * Trait implementations are now coherent, ala Haskell typeclasses
8687 * Trait methods may be static
8688 * Argument modes are deprecated
8689 * Borrowed pointers are much more mature and recommended for use
8690 * Strings and vectors in the static region are stored in constant memory
8691 * Typestate was removed
8692 * Resolution rewritten to be more reliable
8693 * Support for 'dual-mode' data structures (freezing and thawing)
8696 * Most binary operators can now be overloaded via the traits in
8698 * `std::net::url` for representing URLs
8699 * Sendable hash maps in `core::send_map`
8700 * `core::task' gained a (currently unsafe) task-local storage API
8703 * An efficient new intertask communication primitive called the pipe,
8704 along with a number of higher-level channel types, in `core::pipes`
8705 * `std::arc`, an atomically reference counted, immutable, shared memory
8707 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8708 * Futures are now based on pipes and sendable
8709 * More robust linked task failure
8710 * Improved task builder API
8713 * Improved error reporting
8714 * Preliminary JIT support
8715 * Preliminary work on precise GC
8716 * Extensive architectural improvements to rustc
8717 * Begun a transition away from buggy C++-based reflection (shape) code to
8718 Rust-based (visitor) code
8719 * All hash functions and tables converted to secure, randomized SipHash
8722 Version 0.3 (2012-07-12)
8723 ========================
8725 * ~1900 changes, numerous bugfixes
8727 * New coding conveniences
8728 * Integer-literal suffix inference
8729 * Per-item control over warnings, errors
8730 * #[cfg(windows)] and #[cfg(unix)] attributes
8731 * Documentation comments
8732 * More compact closure syntax
8733 * 'do' expressions for treating higher-order functions as
8735 * *-patterns (wildcard extended to all constructor fields)
8738 * Name resolution pass and exhaustiveness checker rewritten
8739 * Region pointers and borrow checking supersede alias
8741 * Init-ness checking is now provided by a region-based liveness
8742 pass instead of the typestate pass; same for last-use analysis
8743 * Extensive work on region pointers
8745 * Experimental new language features
8746 * Slices and fixed-size, interior-allocated vectors
8747 * #!-comments for lang versioning, shell execution
8748 * Destructors and iface implementation for classes;
8749 type-parameterized classes and class methods
8750 * 'const' type kind for types that can be used to implement
8751 shared-memory concurrency patterns
8755 * Removal of various obsolete features
8756 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8757 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8759 * Constructs: do-while loops ('do' repurposed), fn binding,
8760 resources (replaced by destructors)
8762 * Compiler reorganization
8763 * Syntax-layer of compiler split into separate crate
8764 * Clang (from LLVM project) integrated into build
8765 * Typechecker split into sub-modules
8768 * New time functions
8769 * Extension methods for many built-in types
8770 * Arc: atomic-refcount read-only / exclusive-use shared cells
8771 * Par: parallel map and search routines
8772 * Extensive work on libuv interface
8773 * Much vector code moved to libraries
8774 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8775 #include, #include_str, #include_bin
8778 * Cargo automatically resolves dependencies
8781 Version 0.2 (2012-03-29)
8782 =========================
8784 * >1500 changes, numerous bugfixes
8786 * New docs and doc tooling
8788 * New port: FreeBSD x86_64
8790 * Compilation model enhancements
8791 * Generics now specialized, multiply instantiated
8792 * Functions now inlined across separate crates
8794 * Scheduling, stack and threading fixes
8795 * Noticeably improved message-passing performance
8796 * Explicit schedulers
8800 * Experimental new language features
8801 * Operator overloading
8805 * Various language extensions
8806 * C-callback function types: 'crust fn ...'
8807 * Infinite-loop construct: 'loop { ... }'
8808 * Shorten 'mutable' to 'mut'
8809 * Required mutable-local qualifier: 'let mut ...'
8810 * Basic glob-exporting: 'export foo::*;'
8811 * Alt now exhaustive, 'alt check' for runtime-checked
8812 * Block-function form of 'for' loop, with 'break' and 'ret'.
8815 * AST quasi-quote syntax extension
8816 * Revived libuv interface
8817 * New modules: core::{future, iter}, std::arena
8818 * Merged per-platform std::{os*, fs*} to core::{libc, os}
8819 * Extensive cleanup, regularization in libstd, libcore
8822 Version 0.1 (2012-01-20)
8823 ===============================
8825 * Most language features work, including:
8826 * Unique pointers, unique closures, move semantics
8827 * Interface-constrained generics
8828 * Static interface dispatch
8830 * Multithread task scheduling
8831 * Typestate predicates
8832 * Failure unwinding, destructors
8833 * Pattern matching and destructuring assignment
8834 * Lightweight block-lambda syntax
8835 * Preliminary macro-by-example
8837 * Compiler works with the following configurations:
8838 * Linux: x86 and x86_64 hosts and targets
8839 * macOS: x86 and x86_64 hosts and targets
8840 * Windows: x86 hosts and targets
8842 * Cross compilation / multi-target configuration supported.
8844 * Preliminary API-documentation and package-management tools included.
8848 * Documentation is incomplete.
8850 * Performance is below intended target.
8852 * Standard library APIs are subject to extensive change, reorganization.
8854 * Language-level versioning is not yet operational - future code will