1 Version 1.23.0 (2018-01-04)
2 ==========================
6 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
7 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
8 Which should fix some confusing errors in some operations.
12 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
13 undefined behaviour.][45920]
14 - [rustc now suggests renaming import if names clash.][45660]
15 - [Display errors/warnings correctly when there are zero-width or
16 wide characters.][45711]
17 - [rustc now avoids unnecessary copies of arguments that are
18 simple bindings][45380] This should improve memory usage on average by 5-10%.
19 - [Updated musl used to build musl rustc to 1.1.17][45393]
23 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
24 - [Implement Hash for raw pointers to unsized types][45483]
25 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
26 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
27 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
28 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
29 and `<*mut T>::as_mut`][44932]
30 - [Optimized `Thread::{park, unpark}` implementation][45524]
31 - [Improved `SliceExt::binary_search` performance.][45333]
32 - [impl `FromIterator<()>` for `()`][45379]
33 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
41 - [Cargo now supports alternative registries][cargo/4506]
42 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
43 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
44 - [Added unit test checking to `cargo check`][cargo/4592]
45 - [Cargo now lets you install a specific version
46 using `cargo install --version`][cargo/4637]
50 - [Releases now ship with the Cargo book documentation.][45692]
51 - [rustdoc now prints rendering warnings on every run.][45324]
52 - [Release tarballs now come with rustfmt][45903]
56 - [Changes have been made to type equality to make it more correct,
57 in rare cases this could break some code.][45853] [Tracking issue for
58 further information][45852]
59 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
60 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
61 Android 9, the minimum supported version is Android 14.
62 - [Bumped the minimum LLVM to 3.9][45326]
64 [44042]: https://github.com/rust-lang/rust/pull/44042
65 [44932]: https://github.com/rust-lang/rust/pull/44932
66 [45267]: https://github.com/rust-lang/rust/pull/45267
67 [45324]: https://github.com/rust-lang/rust/pull/45324
68 [45326]: https://github.com/rust-lang/rust/pull/45326
69 [45333]: https://github.com/rust-lang/rust/pull/45333
70 [45379]: https://github.com/rust-lang/rust/pull/45379
71 [45380]: https://github.com/rust-lang/rust/pull/45380
72 [45393]: https://github.com/rust-lang/rust/pull/45393
73 [45435]: https://github.com/rust-lang/rust/pull/45435
74 [45483]: https://github.com/rust-lang/rust/pull/45483
75 [45524]: https://github.com/rust-lang/rust/pull/45524
76 [45571]: https://github.com/rust-lang/rust/pull/45571
77 [45580]: https://github.com/rust-lang/rust/pull/45580
78 [45610]: https://github.com/rust-lang/rust/pull/45610
79 [45660]: https://github.com/rust-lang/rust/pull/45660
80 [45692]: https://github.com/rust-lang/rust/pull/45692
81 [45711]: https://github.com/rust-lang/rust/pull/45711
82 [45772]: https://github.com/rust-lang/rust/pull/45772
83 [45852]: https://github.com/rust-lang/rust/issues/45852
84 [45853]: https://github.com/rust-lang/rust/pull/45853
85 [45887]: https://github.com/rust-lang/rust/pull/45887
86 [45903]: https://github.com/rust-lang/rust/pull/45903
87 [45920]: https://github.com/rust-lang/rust/pull/45920
88 [cargo/4506]: https://github.com/rust-lang/cargo/pull/4506
89 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
90 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
91 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
94 Version 1.22.1 (2017-11-22)
95 ==========================
97 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
99 [46183]: https://github.com/rust-lang/rust/pull/46183
101 Version 1.22.0 (2017-11-22)
102 ==========================
106 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
107 - [Now accepts underscores in unicode escapes][43716]
108 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
109 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
113 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
114 - [rustc will no longer inline in codegen units when compiling for debug][45075]
115 This should decrease compile times for debug builds.
116 - [strict memory alignment now enabled on ARMv6][45094]
117 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
121 - [Allow atomic operations up to 32 bits
122 on `armv5te_unknown_linux_gnueabi`][44978]
123 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
124 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
125 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
126 - [Properly detect overflow in `Instant += Duration`.][44220]
127 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
128 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
129 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
136 - [Cargo will now build multi file examples in subdirectories of the `examples`
137 folder that have a `main.rs` file.][cargo/4496]
138 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
139 the old format will continue to work and can be updated with `cargo update`.
140 - [Now supports vendoring git repositories][cargo/3992]
144 - [`libbacktrace` is now available on Apple platforms.][44251]
145 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
146 This now lets you specify that a given code example will fail to compile.
150 - [The minimum Android version that rustc can build for has been bumped
151 to `4.0` from `2.3`][45656]
152 - [Allowing `T op= &T` for numeric types has broken some type
153 inference cases][45480]
156 [42526]: https://github.com/rust-lang/rust/pull/42526
157 [43017]: https://github.com/rust-lang/rust/pull/43017
158 [43716]: https://github.com/rust-lang/rust/pull/43716
159 [43949]: https://github.com/rust-lang/rust/pull/43949
160 [44015]: https://github.com/rust-lang/rust/pull/44015
161 [44220]: https://github.com/rust-lang/rust/pull/44220
162 [44251]: https://github.com/rust-lang/rust/pull/44251
163 [44287]: https://github.com/rust-lang/rust/pull/44287
164 [44303]: https://github.com/rust-lang/rust/pull/44303
165 [44456]: https://github.com/rust-lang/rust/pull/44456
166 [44466]: https://github.com/rust-lang/rust/pull/44466
167 [44895]: https://github.com/rust-lang/rust/pull/44895
168 [44966]: https://github.com/rust-lang/rust/pull/44966
169 [44978]: https://github.com/rust-lang/rust/pull/44978
170 [45041]: https://github.com/rust-lang/rust/pull/45041
171 [45064]: https://github.com/rust-lang/rust/pull/45064
172 [45075]: https://github.com/rust-lang/rust/pull/45075
173 [45094]: https://github.com/rust-lang/rust/pull/45094
174 [45095]: https://github.com/rust-lang/rust/pull/45095
175 [45480]: https://github.com/rust-lang/rust/issues/45480
176 [45656]: https://github.com/rust-lang/rust/pull/45656
177 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
178 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
179 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
186 Version 1.21.0 (2017-10-12)
187 ==========================
191 - [You can now use static references for literals.][43838]
195 let x: &'static u32 = &0;
198 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
201 my_macro!(Vec<i32>::new); // Always worked
202 my_macro!(Vec::<i32>::new); // Now works
207 - [Upgraded jemalloc to 4.5.0][43911]
208 - [Enabled unwinding panics on Redox][43917]
209 - [Now runs LLVM in parallel during translation phase.][43506]
210 This should reduce peak memory usage.
214 - [Generate builtin impls for `Clone` for all arrays and tuples that
215 are `T: Clone`][43690]
216 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
217 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
218 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
223 [`std::mem::discriminant`]
227 - [You can now call `cargo install` with multiple package names][cargo/4216]
228 - [Cargo commands inside a virtual workspace will now implicitly
229 pass `--all`][cargo/4335]
230 - [Added a `[patch]` section to `Cargo.toml` to handle
231 prepublication dependencies][cargo/4123] [RFC 1969]
232 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
233 like patterns][cargo/4270]
234 - [Added the `--all-targets` option][cargo/4400]
235 - [Using required dependencies as a feature is now deprecated and emits
236 a warning][cargo/4364]
241 - [Cargo docs are moving][43916]
242 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
243 - [The rustdoc book is now available][43863]
244 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
245 - [Added a preview of RLS has been made available through rustup][44204]
246 Install with `rustup component add rls-preview`
247 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
248 Previously only showed `std::os::unix`.
252 - [Changes in method matching against higher-ranked types][43880] This may cause
253 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
254 - [rustc's JSON error output's byte position start at top of file.][42973]
255 Was previously relative to the rustc's internal `CodeMap` struct which
256 required the unstable library `libsyntax` to correctly use.
257 - [`unused_results` lint no longer ignores booleans][43728]
259 [42565]: https://github.com/rust-lang/rust/pull/42565
260 [42973]: https://github.com/rust-lang/rust/pull/42973
261 [43348]: https://github.com/rust-lang/rust/pull/43348
262 [43459]: https://github.com/rust-lang/rust/pull/43459
263 [43506]: https://github.com/rust-lang/rust/pull/43506
264 [43540]: https://github.com/rust-lang/rust/pull/43540
265 [43690]: https://github.com/rust-lang/rust/pull/43690
266 [43728]: https://github.com/rust-lang/rust/pull/43728
267 [43838]: https://github.com/rust-lang/rust/pull/43838
268 [43863]: https://github.com/rust-lang/rust/pull/43863
269 [43880]: https://github.com/rust-lang/rust/pull/43880
270 [43911]: https://github.com/rust-lang/rust/pull/43911
271 [43916]: https://github.com/rust-lang/rust/pull/43916
272 [43917]: https://github.com/rust-lang/rust/pull/43917
273 [44204]: https://github.com/rust-lang/rust/pull/44204
274 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
275 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
276 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
277 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
278 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
279 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
280 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
281 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
282 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
284 Version 1.20.0 (2017-08-31)
285 ===========================
289 - [Associated constants are now stabilised.][42809]
290 - [A lot of macro bugs are now fixed.][42913]
295 - [Struct fields are now properly coerced to the expected field type.][42807]
296 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
297 `wasm32-experimental-emscripten` target.
298 - [Changed some of the error messages to be more helpful.][42033]
299 - [Add support for RELRO(RELocation Read-Only) for platforms that support
301 - [rustc now reports the total number of errors on compilation failure][43015]
302 previously this was only the number of errors in the pass that failed.
303 - [Expansion in rustc has been sped up 29x.][42533]
304 - [added `msp430-none-elf` target.][43099]
305 - [rustc will now suggest one-argument enum variant to fix type mismatch when
307 - [Fixes backtraces on Redox][43228]
308 - [rustc now identifies different versions of same crate when absolute paths of
309 different types match in an error message.][42826]
315 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
316 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
318 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
319 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
320 - [Impl `Clone` for `DefaultHasher`.][42799]
321 - [Impl `Sync` for `SyncSender`.][42397]
322 - [Impl `FromStr` for `char`][42271]
323 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
325 - [allow messages in the `unimplemented!()` macro.][42155]
326 ie. `unimplemented!("Waiting for 1.21 to be stable")`
327 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
328 - [Upgrade to Unicode 10.0.0][42999]
329 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
330 - [Skip the main thread's manual stack guard on Linux][43072]
331 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
332 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
334 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
339 - [`CStr::into_c_string`]
340 - [`CString::as_c_str`]
341 - [`CString::into_boxed_c_str`]
344 - [`Chain::into_inner`]
345 - [`Option::get_or_insert_with`]
346 - [`Option::get_or_insert`]
347 - [`OsStr::into_os_string`]
348 - [`OsString::into_boxed_os_str`]
351 - [`Utf8Error::error_len`]
352 - [`char::EscapeDebug`]
353 - [`char::escape_debug`]
359 - [`mem::ManuallyDrop`]
360 - [`slice::sort_unstable_by_key`]
361 - [`slice::sort_unstable_by`]
362 - [`slice::sort_unstable`]
363 - [`str::from_boxed_utf8_unchecked`]
364 - [`str::as_bytes_mut`]
365 - [`str::as_bytes_mut`]
366 - [`str::from_utf8_mut`]
367 - [`str::from_utf8_unchecked_mut`]
369 - [`str::get_unchecked_mut`]
370 - [`str::get_unchecked`]
372 - [`str::into_boxed_bytes`]
377 - [Cargo API token location moved from `~/.cargo/config` to
378 `~/.cargo/credentials`.][cargo/3978]
379 - [Cargo will now build `main.rs` binaries that are in sub-directories of
380 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
381 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
382 - [You can now specify version of a binary when installed through
383 `cargo install` using `--vers`.][cargo/4229]
384 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
385 failure.][cargo/4248]
386 - [Changed the convention around which file is the crate root.][cargo/4259]
387 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
388 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
393 - [Functions with `'static` in their return types will now not be as usable as
394 if they were using lifetime parameters instead.][42417]
395 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
396 takes the sign of NaN into account where previously didn't.][42430]
398 [42033]: https://github.com/rust-lang/rust/pull/42033
399 [42155]: https://github.com/rust-lang/rust/pull/42155
400 [42271]: https://github.com/rust-lang/rust/pull/42271
401 [42397]: https://github.com/rust-lang/rust/pull/42397
402 [42417]: https://github.com/rust-lang/rust/pull/42417
403 [42430]: https://github.com/rust-lang/rust/pull/42430
404 [42431]: https://github.com/rust-lang/rust/pull/42431
405 [42533]: https://github.com/rust-lang/rust/pull/42533
406 [42571]: https://github.com/rust-lang/rust/pull/42571
407 [42613]: https://github.com/rust-lang/rust/pull/42613
408 [42799]: https://github.com/rust-lang/rust/pull/42799
409 [42807]: https://github.com/rust-lang/rust/pull/42807
410 [42809]: https://github.com/rust-lang/rust/pull/42809
411 [42822]: https://github.com/rust-lang/rust/pull/42822
412 [42826]: https://github.com/rust-lang/rust/pull/42826
413 [42854]: https://github.com/rust-lang/rust/pull/42854
414 [42913]: https://github.com/rust-lang/rust/pull/42913
415 [42999]: https://github.com/rust-lang/rust/pull/42999
416 [43011]: https://github.com/rust-lang/rust/pull/43011
417 [43015]: https://github.com/rust-lang/rust/pull/43015
418 [43072]: https://github.com/rust-lang/rust/pull/43072
419 [43077]: https://github.com/rust-lang/rust/pull/43077
420 [43097]: https://github.com/rust-lang/rust/pull/43097
421 [43099]: https://github.com/rust-lang/rust/pull/43099
422 [43170]: https://github.com/rust-lang/rust/pull/43170
423 [43178]: https://github.com/rust-lang/rust/pull/43178
424 [43185]: https://github.com/rust-lang/rust/pull/43185
425 [43228]: https://github.com/rust-lang/rust/pull/43228
426 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
427 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
428 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
429 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
430 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
431 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
432 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
433 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
434 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
435 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
436 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
437 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
438 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
439 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
440 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
441 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
442 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
443 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
444 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
445 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
446 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
447 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
448 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
449 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
450 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
451 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
452 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
453 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
454 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
455 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
456 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
457 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
458 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
459 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
460 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
461 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
462 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
463 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
464 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
467 Version 1.19.0 (2017-07-20)
468 ===========================
473 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
474 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
475 - [Macro recursion limit increased to 1024 from 64.][41676]
476 - [Added lint for detecting unused macros.][41907]
477 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
478 For example: `let x = loop { break 7; };`
479 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
480 contain `Copy` types and cannot have a `Drop` implementation.
481 Example: `union Foo { bar: u8, baz: usize }`
482 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
483 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
488 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
489 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
490 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
491 you should use `--target armv7-linux-androideabi`.
492 - [Fixed ICE when removing a source file between compilation sessions.][41873]
493 - [Minor optimisation of string operations.][42037]
494 - [Compiler error message is now `aborting due to previous error(s)` instead of
495 `aborting due to N previous errors`][42150] This was previously inaccurate and
496 would only count certain kinds of errors.
497 - [The compiler now supports Visual Studio 2017][42225]
498 - [The compiler is now built against LLVM 4.0.1 by default][42948]
499 - [Added a lot][42264] of [new error codes][42302]
500 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
501 libraries with C Run-time Libraries(CRT) to be statically linked.
502 - [Fixed various ARM codegen bugs][42740]
507 - [`String` now implements `FromIterator<Cow<'a, str>>` and
508 `Extend<Cow<'a, str>>`][41449]
509 - [`Vec` now implements `From<&mut [T]>`][41530]
510 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
511 - [`SplitWhitespace` now implements `Clone`][41659]
512 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
514 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
515 macros, but for printing to stderr.
520 - [`OsString::shrink_to_fit`]
523 - [`thread::ThreadId`]
528 - [Build scripts can now add environment variables to the environment
529 the crate is being compiled in.
530 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
531 - [Subcommands now replace the current process rather than spawning a new
532 child process][cargo/3970]
533 - [Workspace members can now accept glob file patterns][cargo/3979]
534 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
535 the members in a given workspace.][cargo/3988]
536 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
537 - [Target directory path is now in the cargo metadata][cargo/4022]
538 - [Cargo no longer checks out a local working directory for the
539 crates.io index][cargo/4026] This should provide smaller file size for the
540 registry, and improve cloning times, especially on Windows machines.
541 - [Added an `--exclude` option for excluding certain packages when using the
542 `--all` option][cargo/4031]
543 - [Cargo will now automatically retry when receiving a 5xx error
544 from crates.io][cargo/4032]
545 - [The `--features` option now accepts multiple comma or space
546 delimited values.][cargo/4084]
547 - [Added support for custom target specific runners][cargo/3954]
552 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
554 - [Rust will now release XZ compressed packages][rust-installer/57]
555 - [rustup will now prefer to download rust packages with
556 XZ compression][rustup/1100] over GZip packages.
557 - [Added the ability to escape `#` in rust documentation][41785] By adding
558 additional `#`'s ie. `##` is now `#`
563 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
564 - [`-Z` flags are now no longer allowed to be used on the stable
565 compiler.][41751] This has been a warning for a year previous to this.
566 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
567 longer works][42844]. Users should migrate to the built-in `check`
568 command, which has been available since 1.16.
569 - [Ending a float literal with `._` is now a hard error.
570 Example: `42._` .][41946]
571 - [Any use of a private `extern crate` outside of its module is now a
572 hard error.][36886] This was previously a warning.
573 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
574 relative while the `::` prefix makes a path absolute, but was ignored and the
575 path was relative regardless.
576 - [Floating point constants in match patterns is now a hard error][36890]
577 This was previously a warning.
578 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
579 match patterns is now a hard error][36891] This was previously a warning.
580 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
582 - [From the pound escape, lines consisting of multiple `#`s are
584 - [It is an error to reexport private enum variants][42460]. This is
585 known to break a number of crates that depend on an older version of
587 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
588 to use it to find the linker, and the build will fail where it did
589 not previously][42607]
591 [36886]: https://github.com/rust-lang/rust/issues/36886
592 [36888]: https://github.com/rust-lang/rust/issues/36888
593 [36890]: https://github.com/rust-lang/rust/issues/36890
594 [36891]: https://github.com/rust-lang/rust/issues/36891
595 [36892]: https://github.com/rust-lang/rust/issues/36892
596 [37406]: https://github.com/rust-lang/rust/issues/37406
597 [39983]: https://github.com/rust-lang/rust/pull/39983
598 [41145]: https://github.com/rust-lang/rust/pull/41145
599 [41192]: https://github.com/rust-lang/rust/pull/41192
600 [41258]: https://github.com/rust-lang/rust/pull/41258
601 [41370]: https://github.com/rust-lang/rust/pull/41370
602 [41449]: https://github.com/rust-lang/rust/pull/41449
603 [41530]: https://github.com/rust-lang/rust/pull/41530
604 [41624]: https://github.com/rust-lang/rust/pull/41624
605 [41656]: https://github.com/rust-lang/rust/pull/41656
606 [41659]: https://github.com/rust-lang/rust/pull/41659
607 [41676]: https://github.com/rust-lang/rust/pull/41676
608 [41751]: https://github.com/rust-lang/rust/pull/41751
609 [41764]: https://github.com/rust-lang/rust/pull/41764
610 [41785]: https://github.com/rust-lang/rust/pull/41785
611 [41873]: https://github.com/rust-lang/rust/pull/41873
612 [41907]: https://github.com/rust-lang/rust/pull/41907
613 [41946]: https://github.com/rust-lang/rust/pull/41946
614 [42016]: https://github.com/rust-lang/rust/pull/42016
615 [42037]: https://github.com/rust-lang/rust/pull/42037
616 [42068]: https://github.com/rust-lang/rust/pull/42068
617 [42150]: https://github.com/rust-lang/rust/pull/42150
618 [42162]: https://github.com/rust-lang/rust/pull/42162
619 [42225]: https://github.com/rust-lang/rust/pull/42225
620 [42264]: https://github.com/rust-lang/rust/pull/42264
621 [42302]: https://github.com/rust-lang/rust/pull/42302
622 [42460]: https://github.com/rust-lang/rust/issues/42460
623 [42607]: https://github.com/rust-lang/rust/issues/42607
624 [42740]: https://github.com/rust-lang/rust/pull/42740
625 [42844]: https://github.com/rust-lang/rust/issues/42844
626 [42948]: https://github.com/rust-lang/rust/pull/42948
627 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
628 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
629 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
630 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
631 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
632 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
633 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
634 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
635 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
636 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
637 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
638 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
639 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
640 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
641 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
642 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
643 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
644 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
645 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
646 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
647 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
648 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
651 Version 1.18.0 (2017-06-08)
652 ===========================
657 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
658 make the item visible to just that module tree. Also accepts the keyword
659 `crate` to make something public to the whole crate but not users of the
660 library. Example: `pub(crate) mod utils;`. [RFC 1422].
661 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
662 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
663 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
664 types like `Write + Send`, trailing `+` are now supported in trait objects,
665 and better error reporting for trait objects starting with `?Sized`.
666 - [0e+10 is now a valid floating point literal][40589]
667 - [Now warns if you bind a lifetime parameter to 'static][40734]
668 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
669 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
670 representation in some cases.][40377]
675 - [rustc can now emit mir with `--emit mir`][39891]
676 - [Improved LLVM IR for trivial functions][40367]
677 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
678 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
679 opportunities found through profiling
680 - [Improved backtrace formatting when panicking][38165]
685 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
686 iterator hasn't been advanced the original `Vec` is reassembled with no actual
687 iteration or reallocation.
688 - [Simplified HashMap Bucket interface][40561] provides performance
689 improvements for iterating and cloning.
690 - [Specialize Vec::from_elem to use calloc][40409]
691 - [Fixed Race condition in fs::create_dir_all][39799]
692 - [No longer caching stdio on Windows][40516]
693 - [Optimized insertion sort in slice][40807] insertion sort in some cases
694 2.50%~ faster and in one case now 12.50% faster.
695 - [Optimized `AtomicBool::fetch_nand`][41143]
700 - [`Child::try_wait`]
701 - [`HashMap::retain`]
702 - [`HashSet::retain`]
704 - [`TcpStream::peek`]
705 - [`UdpSocket::peek`]
706 - [`UdpSocket::peek_from`]
711 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
712 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
713 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
714 - [Added Android build support][cargo/3885]
715 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
716 of a certain type, for example `cargo build --bins` will build all
718 - [Added support for haiku][cargo/3952]
723 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
724 - [Added rust-windbg script for better debugging on Windows][39983]
725 - [Rust now uses the official cross compiler for NetBSD][40612]
726 - [rustdoc now accepts `#` at the start of files][40828]
727 - [Fixed jemalloc support for musl][41168]
732 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
733 always placed after the sign if it exists and before the digits. With the `#`
734 flag the zeroes are placed after the prefix and before the digits.
735 - [Due to the struct field optimisation][40377], using `transmute` on structs
736 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
737 always been undefined behavior, but is now more likely to break in practice.
738 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
739 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
740 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
741 - [Overlapping inherent `impl`s are now a hard error][40728]
742 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
743 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
744 `out.asm` and `out.ll` instead of only one of the filetypes.
745 - [ calling a function that returns `Self` will no longer work][41805] when
746 the size of `Self` cannot be statically determined.
747 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
748 this has caused a few regressions namely:
750 - Changed the link order of local static/dynamic libraries (respecting the
751 order on given rather than having the compiler reorder).
752 - Changed how MinGW is linked, native code linked to dynamic libraries
753 may require manually linking to the gcc support library (for the native
756 [38165]: https://github.com/rust-lang/rust/pull/38165
757 [39799]: https://github.com/rust-lang/rust/pull/39799
758 [39891]: https://github.com/rust-lang/rust/pull/39891
759 [39983]: https://github.com/rust-lang/rust/pull/39983
760 [40043]: https://github.com/rust-lang/rust/pull/40043
761 [40241]: https://github.com/rust-lang/rust/pull/40241
762 [40338]: https://github.com/rust-lang/rust/pull/40338
763 [40367]: https://github.com/rust-lang/rust/pull/40367
764 [40377]: https://github.com/rust-lang/rust/pull/40377
765 [40409]: https://github.com/rust-lang/rust/pull/40409
766 [40516]: https://github.com/rust-lang/rust/pull/40516
767 [40556]: https://github.com/rust-lang/rust/pull/40556
768 [40561]: https://github.com/rust-lang/rust/pull/40561
769 [40589]: https://github.com/rust-lang/rust/pull/40589
770 [40612]: https://github.com/rust-lang/rust/pull/40612
771 [40723]: https://github.com/rust-lang/rust/pull/40723
772 [40728]: https://github.com/rust-lang/rust/pull/40728
773 [40731]: https://github.com/rust-lang/rust/pull/40731
774 [40734]: https://github.com/rust-lang/rust/pull/40734
775 [40805]: https://github.com/rust-lang/rust/pull/40805
776 [40807]: https://github.com/rust-lang/rust/pull/40807
777 [40828]: https://github.com/rust-lang/rust/pull/40828
778 [40870]: https://github.com/rust-lang/rust/pull/40870
779 [41085]: https://github.com/rust-lang/rust/pull/41085
780 [41143]: https://github.com/rust-lang/rust/pull/41143
781 [41168]: https://github.com/rust-lang/rust/pull/41168
782 [41270]: https://github.com/rust-lang/rust/issues/41270
783 [41469]: https://github.com/rust-lang/rust/pull/41469
784 [41805]: https://github.com/rust-lang/rust/issues/41805
785 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
786 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
787 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
788 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
789 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
790 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
791 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
792 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
793 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
794 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
795 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
796 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
797 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
798 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
801 Version 1.17.0 (2017-04-27)
802 ===========================
807 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
808 * [Fields of structs may be initialized without duplicating the field/variable
809 names][39761]. [RFC 1682]
810 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
811 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
812 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
813 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
815 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
816 * [Static variables may contain references to other statics][40027]
821 * [Exit quickly on only `--emit dep-info`][40336]
822 * [Make `-C relocation-model` more correctly determine whether the linker
823 creates a position-independent executable][40245]
824 * [Add `-C overflow-checks` to directly control whether integer overflow
826 * [The rustc type checker now checks items on demand instead of in a single
827 in-order pass][40008]. This is mostly an internal refactoring in support of
828 future work, including incremental type checking, but also resolves [RFC
829 1647], allowing `Self` to appear in `impl` `where` clauses.
830 * [Optimize vtable loads][39995]
831 * [Turn off vectorization for Emscripten targets][39990]
832 * [Provide suggestions for unknown macros imported with `use`][39953]
833 * [Fix ICEs in path resolution][39939]
834 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
835 * [Add clearer error message using `&str + &str`][39116]
847 * [`Ordering::then_with`]
848 * [`BTreeMap::range`]
849 * [`BTreeMap::range_mut`]
850 * [`collections::Bound`]
852 * [`ptr::read_unaligned`]
853 * [`ptr::write_unaligned`]
854 * [`Result::expect_err`]
857 * [`Cell::into_inner`]
863 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
864 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
865 * [`String` implements `FromIterator<&char>`][40028]
866 * `Box` [implements][40009] a number of new conversions:
867 `From<Box<str>> for String`,
868 `From<Box<[T]>> for Vec<T>`,
869 `From<Box<CStr>> for CString`,
870 `From<Box<OsStr>> for OsString`,
871 `From<Box<Path>> for PathBuf`,
872 `Into<Box<str>> for String`,
873 `Into<Box<[T]>> for Vec<T>`,
874 `Into<Box<CStr>> for CString`,
875 `Into<Box<OsStr>> for OsString`,
876 `Into<Box<Path>> for PathBuf`,
877 `Default for Box<str>`,
878 `Default for Box<CStr>`,
879 `Default for Box<OsStr>`,
880 `From<&CStr> for Box<CStr>`,
881 `From<&OsStr> for Box<OsStr>`,
882 `From<&Path> for Box<Path>`
883 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
884 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
885 * [Slightly optimize `slice::sort`][39538]
886 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
887 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
888 `Box<str>` implements `From<&str>`][39438]
889 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
890 `From<(I, u16)> where I: Into<IpAddr>`][39372]
891 * [`format!` estimates the needed capacity before writing a string][39356]
892 * [Support unprivileged symlink creation in Windows][38921]
893 * [`PathBuf` implements `Default`][38764]
894 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
895 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
896 and poor hash functions.
901 * [Add `cargo check --all`][cargo/3731]
902 * [Add an option to ignore SSL revocation checking][cargo/3699]
903 * [Add `cargo run --package`][cargo/3691]
904 * [Add `required_features`][cargo/3667]
905 * [Assume `build.rs` is a build script][cargo/3664]
906 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
911 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
913 * [The "Unstable Book" documents nightly-only features][ubook]
914 * [Improve the style of the sidebar in rustdoc output][40265]
915 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
916 * [Fix MSP430 breakage due to `i128`][40257]
917 * [Preliminary Solaris/SPARCv9 support][39903]
918 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
919 run without installing the MSVC runtime.
920 * [`rustdoc --test` includes file names in test names][39788]
921 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
922 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
923 * [Initial support for `aarch64-unknown-freebsd`][39491]
924 * [Initial support for `i686-unknown-netbsd`][39426]
925 * [This release no longer includes the old makefile build system][39431]. Rust
926 is built with a custom build system, written in Rust, and with Cargo.
927 * [Add Debug implementations for libcollection structs][39002]
928 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
929 * [`--test-threads=0` produces an error][38945]
930 * [`rustup` installs documentation by default][40526]
931 * [The Rust source includes NatVis visualizations][39843]. These can be used by
932 WinDbg and Visual Studio to improve the debugging experience.
937 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
938 workaround, either use MSVC 2015 or run vcvars.bat.
939 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
940 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
941 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
943 * [`format!` and `Display::to_string` panic if an underlying formatting
944 implementation returns an error][40117]. Previously the error was silently
945 ignored. It is incorrect for `write_fmt` to return an error when writing
947 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
948 crates were marked stable and could be accessed from the stable toolchain.
949 * [Rust git source no longer includes vendored crates][39728]. Those that need
950 to build with vendored crates should build from release tarballs.
951 * [Fix inert attributes from `proc_macro_derives`][39572]
952 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
953 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
955 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
956 existing code generally ignores the type of dead-code unless a type-hint is
957 provided; this can cause surprising inference interactions particularly around
958 defaulting. The new code uniformly ignores the result type of dead-code.
959 * [Tuple-struct constructors with private fields are no longer visible][38932]
960 * [Lifetime parameters that do not appear in the arguments are now considered
961 early-bound][38897], resolving a soundness bug (#[32330]). The
962 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
964 * [rustdoc: fix doctests with non-feature crate attributes][38161]
965 * [Make transmuting from fn item types to pointer-sized types a hard
968 [27787]: https://github.com/rust-lang/rust/issues/27787
969 [32330]: https://github.com/rust-lang/rust/issues/32330
970 [34198]: https://github.com/rust-lang/rust/pull/34198
971 [38161]: https://github.com/rust-lang/rust/pull/38161
972 [38368]: https://github.com/rust-lang/rust/pull/38368
973 [38584]: https://github.com/rust-lang/rust/issues/38584
974 [38661]: https://github.com/rust-lang/rust/pull/38661
975 [38764]: https://github.com/rust-lang/rust/pull/38764
976 [38864]: https://github.com/rust-lang/rust/issues/38864
977 [38897]: https://github.com/rust-lang/rust/pull/38897
978 [38921]: https://github.com/rust-lang/rust/pull/38921
979 [38932]: https://github.com/rust-lang/rust/pull/38932
980 [38945]: https://github.com/rust-lang/rust/pull/38945
981 [38981]: https://github.com/rust-lang/rust/pull/38981
982 [39002]: https://github.com/rust-lang/rust/pull/39002
983 [39116]: https://github.com/rust-lang/rust/pull/39116
984 [39193]: https://github.com/rust-lang/rust/pull/39193
985 [39265]: https://github.com/rust-lang/rust/pull/39265
986 [39356]: https://github.com/rust-lang/rust/pull/39356
987 [39372]: https://github.com/rust-lang/rust/pull/39372
988 [39426]: https://github.com/rust-lang/rust/pull/39426
989 [39431]: https://github.com/rust-lang/rust/pull/39431
990 [39438]: https://github.com/rust-lang/rust/pull/39438
991 [39440]: https://github.com/rust-lang/rust/pull/39440
992 [39485]: https://github.com/rust-lang/rust/pull/39485
993 [39491]: https://github.com/rust-lang/rust/pull/39491
994 [39518]: https://github.com/rust-lang/rust/pull/39518
995 [39538]: https://github.com/rust-lang/rust/pull/39538
996 [39572]: https://github.com/rust-lang/rust/pull/39572
997 [39633]: https://github.com/rust-lang/rust/pull/39633
998 [39642]: https://github.com/rust-lang/rust/pull/39642
999 [39728]: https://github.com/rust-lang/rust/pull/39728
1000 [39761]: https://github.com/rust-lang/rust/pull/39761
1001 [39788]: https://github.com/rust-lang/rust/pull/39788
1002 [39793]: https://github.com/rust-lang/rust/pull/39793
1003 [39837]: https://github.com/rust-lang/rust/pull/39837
1004 [39843]: https://github.com/rust-lang/rust/pull/39843
1005 [39851]: https://github.com/rust-lang/rust/pull/39851
1006 [39903]: https://github.com/rust-lang/rust/pull/39903
1007 [39939]: https://github.com/rust-lang/rust/pull/39939
1008 [39953]: https://github.com/rust-lang/rust/pull/39953
1009 [39960]: https://github.com/rust-lang/rust/pull/39960
1010 [39990]: https://github.com/rust-lang/rust/pull/39990
1011 [39995]: https://github.com/rust-lang/rust/pull/39995
1012 [40008]: https://github.com/rust-lang/rust/pull/40008
1013 [40009]: https://github.com/rust-lang/rust/pull/40009
1014 [40027]: https://github.com/rust-lang/rust/pull/40027
1015 [40028]: https://github.com/rust-lang/rust/pull/40028
1016 [40037]: https://github.com/rust-lang/rust/pull/40037
1017 [40117]: https://github.com/rust-lang/rust/pull/40117
1018 [40166]: https://github.com/rust-lang/rust/pull/40166
1019 [40245]: https://github.com/rust-lang/rust/pull/40245
1020 [40257]: https://github.com/rust-lang/rust/pull/40257
1021 [40261]: https://github.com/rust-lang/rust/pull/40261
1022 [40265]: https://github.com/rust-lang/rust/pull/40265
1023 [40319]: https://github.com/rust-lang/rust/pull/40319
1024 [40336]: https://github.com/rust-lang/rust/pull/40336
1025 [40526]: https://github.com/rust-lang/rust/pull/40526
1026 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1027 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
1028 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
1029 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
1030 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
1031 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
1032 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
1033 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
1034 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
1035 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
1036 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
1037 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
1038 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
1039 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
1040 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1041 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
1042 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
1043 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
1044 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
1045 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
1046 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
1047 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
1048 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
1049 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
1050 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
1051 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
1052 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
1053 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
1054 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
1055 [mdbook]: https://crates.io/crates/mdbook
1056 [ubook]: https://doc.rust-lang.org/unstable-book/
1059 Version 1.16.0 (2017-03-16)
1060 ===========================
1065 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1066 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1067 match patterns][38069]
1068 * [Clean up semantics of `self` in an import list][38313]
1069 * [`Self` may appear in `impl` headers][38920]
1070 * [`Self` may appear in struct expressions][39282]
1075 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
1076 a `.rmeta` file containing only crate metadata][38571]. This can be
1077 used by tools like the Rust Language Service to perform
1078 metadata-only builds.
1079 * [Levenshtein based typo suggestions now work in most places, while
1080 previously they worked only for fields and sometimes for local
1081 variables][38927]. Together with the overhaul of "no
1082 resolution"/"unexpected resolution" errors (#[38154]) they result in
1083 large and systematic improvement in resolution diagnostics.
1084 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
1086 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
1087 * [`rustc` no longer attempts to provide "consider using an explicit
1088 lifetime" suggestions][37057]. They were inaccurate.
1093 * [`VecDeque::truncate`]
1094 * [`VecDeque::resize`]
1095 * [`String::insert_str`]
1096 * [`Duration::checked_add`]
1097 * [`Duration::checked_sub`]
1098 * [`Duration::checked_div`]
1099 * [`Duration::checked_mul`]
1102 * [`SocketAddr::is_ipv4`]
1103 * [`SocketAddr::is_ipv6`]
1104 * [`IpAddr::is_ipv4`]
1105 * [`IpAddr::is_ipv6`]
1107 * [`Vec::dedup_by_key`]
1108 * [`Result::unwrap_or_default`]
1109 * [`<*const T>::wrapping_offset`]
1110 * [`<*mut T>::wrapping_offset`]
1111 * `CommandExt::creation_flags`
1112 * [`File::set_permissions`]
1113 * [`String::split_off`]
1118 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
1119 their argument by `Borrow` parameter][37761]
1120 * [All public types in std implement `Debug`][38006]
1121 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
1122 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
1123 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1125 * [std: Fix partial writes in `LineWriter`][38062]
1126 * [std: Clamp max read/write sizes on Unix][38062]
1127 * [Use more specific panic message for `&str` slicing errors][38066]
1128 * [`TcpListener::set_only_v6` is deprecated][38304]. This
1129 functionality cannot be achieved in std currently.
1130 * [`writeln!`, like `println!`, now accepts a form with no string
1131 or formatting arguments, to just print a newline][38469]
1132 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
1133 * [Reduce the size of static data in `std_unicode::tables`][38781]
1134 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
1135 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
1137 * [`Duration` implements `Sum`][38712]
1138 * [`String` implements `ToSocketAddrs`][39048]
1143 * [The `cargo check` command does a type check of a project without
1144 building it][cargo/3296]
1145 * [crates.io will display CI badges from Travis and AppVeyor, if
1146 specified in Cargo.toml][cargo/3546]
1147 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
1148 * [Compilation profiles accept integer values for `debug`, in addition
1149 to `true` and `false`. These are passed to `rustc` as the value to
1150 `-C debuginfo`][cargo/3534]
1151 * [Implement `cargo --version --verbose`][cargo/3604]
1152 * [All builds now output 'dep-info' build dependencies compatible with
1153 make and ninja][cargo/3557]
1154 * [Build all workspace members with `build --all`][cargo/3511]
1155 * [Document all workspace members with `doc --all`][cargo/3515]
1156 * [Path deps outside workspace are not members][cargo/3443]
1161 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
1162 the path to the Rust implementation][38589]
1163 * [The `armv7-linux-androideabi` target no longer enables NEON
1164 extensions, per Google's ABI guide][38413]
1165 * [The stock standard library can be compiled for Redox OS][38401]
1166 * [Rust has initial SPARC support][38726]. Tier 3. No builds
1168 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
1170 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
1175 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1176 match patterns][38069]
1177 * In this release, references to uninhabited types can not be
1178 pattern-matched. This was accidentally allowed in 1.15.
1179 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1180 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1182 * [Clean up semantics of `self` in an import list][38313]
1183 * Reimplemented lifetime elision. This change was almost entirely compatible
1184 with existing code, but it did close a number of small bugs and loopholes,
1185 as well as being more accepting in some other [cases][41105].
1187 [37057]: https://github.com/rust-lang/rust/pull/37057
1188 [37761]: https://github.com/rust-lang/rust/pull/37761
1189 [38006]: https://github.com/rust-lang/rust/pull/38006
1190 [38051]: https://github.com/rust-lang/rust/pull/38051
1191 [38062]: https://github.com/rust-lang/rust/pull/38062
1192 [38062]: https://github.com/rust-lang/rust/pull/38622
1193 [38066]: https://github.com/rust-lang/rust/pull/38066
1194 [38069]: https://github.com/rust-lang/rust/pull/38069
1195 [38131]: https://github.com/rust-lang/rust/pull/38131
1196 [38154]: https://github.com/rust-lang/rust/pull/38154
1197 [38274]: https://github.com/rust-lang/rust/pull/38274
1198 [38304]: https://github.com/rust-lang/rust/pull/38304
1199 [38313]: https://github.com/rust-lang/rust/pull/38313
1200 [38314]: https://github.com/rust-lang/rust/pull/38314
1201 [38327]: https://github.com/rust-lang/rust/pull/38327
1202 [38401]: https://github.com/rust-lang/rust/pull/38401
1203 [38413]: https://github.com/rust-lang/rust/pull/38413
1204 [38469]: https://github.com/rust-lang/rust/pull/38469
1205 [38559]: https://github.com/rust-lang/rust/pull/38559
1206 [38571]: https://github.com/rust-lang/rust/pull/38571
1207 [38580]: https://github.com/rust-lang/rust/pull/38580
1208 [38589]: https://github.com/rust-lang/rust/pull/38589
1209 [38670]: https://github.com/rust-lang/rust/pull/38670
1210 [38712]: https://github.com/rust-lang/rust/pull/38712
1211 [38726]: https://github.com/rust-lang/rust/pull/38726
1212 [38781]: https://github.com/rust-lang/rust/pull/38781
1213 [38798]: https://github.com/rust-lang/rust/pull/38798
1214 [38909]: https://github.com/rust-lang/rust/pull/38909
1215 [38920]: https://github.com/rust-lang/rust/pull/38920
1216 [38927]: https://github.com/rust-lang/rust/pull/38927
1217 [39048]: https://github.com/rust-lang/rust/pull/39048
1218 [39282]: https://github.com/rust-lang/rust/pull/39282
1219 [39379]: https://github.com/rust-lang/rust/pull/39379
1220 [41105]: https://github.com/rust-lang/rust/issues/41105
1221 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1222 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1223 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
1224 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
1225 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
1226 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
1227 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
1228 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
1229 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
1230 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
1231 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
1232 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
1233 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
1234 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
1235 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
1236 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
1237 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
1238 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
1239 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
1240 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
1241 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
1242 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
1243 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
1244 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
1245 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
1246 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
1247 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
1248 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
1249 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
1250 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1253 Version 1.15.1 (2017-02-09)
1254 ===========================
1256 * [Fix IntoIter::as_mut_slice's signature][39466]
1257 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
1259 [39466]: https://github.com/rust-lang/rust/pull/39466
1260 [39523]: https://github.com/rust-lang/rust/pull/39523
1263 Version 1.15.0 (2017-02-02)
1264 ===========================
1269 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
1270 stable. This allows popular code-generating crates like Serde and Diesel to
1271 work ergonomically. [RFC 1681].
1272 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
1273 with curly braces][36868]. Part of [RFC 1506].
1274 * [A number of minor changes to name resolution have been activated][37127].
1275 They add up to more consistent semantics, allowing for future evolution of
1276 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1277 details of what is different. The breaking changes here have been transitioned
1278 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1279 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
1281 * [`?Sized` can be used in `where` clauses][37791]
1282 * [There is now a limit on the size of monomorphized types and it can be
1283 modified with the `#![type_size_limit]` crate attribute, similarly to
1284 the `#![recursion_limit]` attribute][37789]
1289 * [On Windows, the compiler will apply dllimport attributes when linking to
1290 extern functions][37973]. Additional attributes and flags can control which
1291 library kind is linked and its name. [RFC 1717].
1292 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1293 * [The `--test` flag works with procedural macro crates][38107]
1294 * [Fix `extern "aapcs" fn` ABI][37814]
1295 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
1296 * [The `format!` expander recognizes incorrect `printf` and shell-style
1297 formatting directives and suggests the correct format][37613].
1298 * [Only report one error for all unused imports in an import list][37456]
1300 Compiler Performance
1301 --------------------
1303 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
1304 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
1305 * [Don't clone in `UnificationTable::probe`][37848]
1306 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
1307 * [Use small vectors in type walker][37760]
1308 * [Macro expansion performance was improved][37701]
1309 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
1310 * [Replace FNV with a faster hash function][37229]
1315 * [`std::iter::Iterator::min_by`]
1316 * [`std::iter::Iterator::max_by`]
1317 * [`std::os::*::fs::FileExt`]
1318 * [`std::sync::atomic::Atomic*::get_mut`]
1319 * [`std::sync::atomic::Atomic*::into_inner`]
1320 * [`std::vec::IntoIter::as_slice`]
1321 * [`std::vec::IntoIter::as_mut_slice`]
1322 * [`std::sync::mpsc::Receiver::try_iter`]
1323 * [`std::os::unix::process::CommandExt::before_exec`]
1324 * [`std::rc::Rc::strong_count`]
1325 * [`std::rc::Rc::weak_count`]
1326 * [`std::sync::Arc::strong_count`]
1327 * [`std::sync::Arc::weak_count`]
1328 * [`std::char::encode_utf8`]
1329 * [`std::char::encode_utf16`]
1330 * [`std::cell::Ref::clone`]
1331 * [`std::io::Take::into_inner`]
1336 * [The standard sorting algorithm has been rewritten for dramatic performance
1337 improvements][38192]. It is a hybrid merge sort, drawing influences from
1338 Timsort. Previously it was a naive merge sort.
1339 * [`Iterator::nth` no longer has a `Sized` bound][38134]
1340 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
1342 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
1343 and `char_indices().last()`][37882]
1344 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
1345 * [Chinese characters display correctly in `fmt::Debug`][37855]
1346 * [Derive `Default` for `Duration`][37699]
1347 * [Support creation of anonymous pipes on WinXP/2k][37677]
1348 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
1349 * [Don't pass overlapped handles to processes][38835]
1354 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1355 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1356 should instead check the variable at runtime with `std::env`. That the value
1357 was set at build time was a bug, and incorrect when cross-compiling. This
1358 change is known to cause breakage.
1359 * [Add `--all` flag to `cargo test`][cargo/3221]
1360 * [Compile statically against the MSVC CRT][cargo/3363]
1361 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
1362 * [Link OpenSSL statically on OSX][cargo/3311]
1363 * [Apply new fingerprinting to build dir outputs][cargo/3310]
1364 * [Test for bad path overrides with summaries][cargo/3336]
1365 * [Require `cargo install --vers` to take a semver version][cargo/3338]
1366 * [Fix retrying crate downloads for network errors][cargo/3348]
1367 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
1368 * [Emit more info on --message-format=json][cargo/3319]
1369 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
1370 * [Don't ignore errors in workspace manifest][cargo/3409]
1371 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
1376 * [Test runners (binaries built with `--test`) now support a `--list` argument
1377 that lists the tests it contains][38185]
1378 * [Test runners now support a `--exact` argument that makes the test filter
1379 match exactly, instead of matching only a substring of the test name][38181]
1380 * [rustdoc supports a `--playground-url` flag][37763]
1381 * [rustdoc provides more details about `#[should_panic]` errors][37749]
1386 * [The Rust build system is now written in Rust][37817]. The Makefiles may
1387 continue to be used in this release by passing `--disable-rustbuild` to the
1388 configure script, but they will be deleted soon. Note that the new build
1389 system uses a different on-disk layout that will likely affect any scripts
1391 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
1393 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
1394 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
1400 * [A number of minor changes to name resolution have been activated][37127].
1401 They add up to more consistent semantics, allowing for future evolution of
1402 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1403 details of what is different. The breaking changes here have been transitioned
1404 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1405 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1406 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1407 should instead check the variable at runtime with `std::env`. That the value
1408 was set at build time was a bug, and incorrect when cross-compiling. This
1409 change is known to cause breakage.
1410 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
1411 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
1412 1.10 and is now an error by default. It will become a hard error in the near
1414 * [The semantics relating modules to file system directories are changing in
1415 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
1416 lint, which is a warning in this release, and will become a hard error in the
1418 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1419 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
1420 the underlying iterator][37834]
1422 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
1423 [33685]: https://github.com/rust-lang/rust/issues/33685
1424 [36868]: https://github.com/rust-lang/rust/pull/36868
1425 [37127]: https://github.com/rust-lang/rust/pull/37127
1426 [37229]: https://github.com/rust-lang/rust/pull/37229
1427 [37456]: https://github.com/rust-lang/rust/pull/37456
1428 [37527]: https://github.com/rust-lang/rust/pull/37527
1429 [37602]: https://github.com/rust-lang/rust/pull/37602
1430 [37613]: https://github.com/rust-lang/rust/pull/37613
1431 [37615]: https://github.com/rust-lang/rust/pull/37615
1432 [37636]: https://github.com/rust-lang/rust/pull/37636
1433 [37627]: https://github.com/rust-lang/rust/pull/37627
1434 [37642]: https://github.com/rust-lang/rust/pull/37642
1435 [37677]: https://github.com/rust-lang/rust/pull/37677
1436 [37699]: https://github.com/rust-lang/rust/pull/37699
1437 [37701]: https://github.com/rust-lang/rust/pull/37701
1438 [37705]: https://github.com/rust-lang/rust/pull/37705
1439 [37749]: https://github.com/rust-lang/rust/pull/37749
1440 [37760]: https://github.com/rust-lang/rust/pull/37760
1441 [37763]: https://github.com/rust-lang/rust/pull/37763
1442 [37764]: https://github.com/rust-lang/rust/pull/37764
1443 [37789]: https://github.com/rust-lang/rust/pull/37789
1444 [37791]: https://github.com/rust-lang/rust/pull/37791
1445 [37814]: https://github.com/rust-lang/rust/pull/37814
1446 [37817]: https://github.com/rust-lang/rust/pull/37817
1447 [37834]: https://github.com/rust-lang/rust/pull/37834
1448 [37848]: https://github.com/rust-lang/rust/pull/37848
1449 [37855]: https://github.com/rust-lang/rust/pull/37855
1450 [37882]: https://github.com/rust-lang/rust/pull/37882
1451 [37888]: https://github.com/rust-lang/rust/pull/37888
1452 [37973]: https://github.com/rust-lang/rust/pull/37973
1453 [37979]: https://github.com/rust-lang/rust/pull/37979
1454 [38086]: https://github.com/rust-lang/rust/pull/38086
1455 [38107]: https://github.com/rust-lang/rust/pull/38107
1456 [38117]: https://github.com/rust-lang/rust/pull/38117
1457 [38134]: https://github.com/rust-lang/rust/pull/38134
1458 [38146]: https://github.com/rust-lang/rust/pull/38146
1459 [38181]: https://github.com/rust-lang/rust/pull/38181
1460 [38182]: https://github.com/rust-lang/rust/pull/38182
1461 [38185]: https://github.com/rust-lang/rust/pull/38185
1462 [38192]: https://github.com/rust-lang/rust/pull/38192
1463 [38279]: https://github.com/rust-lang/rust/pull/38279
1464 [38835]: https://github.com/rust-lang/rust/pull/38835
1465 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1466 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
1467 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
1468 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
1469 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
1470 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
1471 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
1472 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
1473 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
1474 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
1475 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
1476 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
1477 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
1478 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
1479 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
1480 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
1481 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
1482 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
1483 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
1484 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
1485 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
1486 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
1487 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
1488 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
1489 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
1490 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
1491 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
1492 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
1493 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
1494 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
1495 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
1496 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
1497 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
1498 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
1499 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
1500 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
1501 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
1502 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
1505 Version 1.14.0 (2016-12-22)
1506 ===========================
1511 * [`..` matches multiple tuple fields in enum variants, structs
1512 and tuples][36843]. [RFC 1492].
1513 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
1514 * [`use *` and `use ::*` both glob-import from the crate root][37367]
1515 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
1516 dereferencing][36822]
1521 * [Mark enums with non-zero discriminant as non-zero][37224]
1522 * [Lower-case `static mut` names are linted like other
1523 statics and consts][37162]
1524 * [Fix ICE on some macros in const integer positions
1525 (e.g. `[u8; m!()]`)][36819]
1526 * [Improve error message and snippet for "did you mean `x`"][36798]
1527 * [Add a panic-strategy field to the target specification][36794]
1528 * [Include LLVM version in `--version --verbose`][37200]
1530 Compile-time Optimizations
1531 --------------------------
1533 * [Improve macro expansion performance][37569]
1534 * [Shrink `Expr_::ExprInlineAsm`][37445]
1535 * [Replace all uses of SHA-256 with BLAKE2b][37439]
1536 * [Reduce the number of bytes hashed by `IchHasher`][37427]
1537 * [Avoid more allocations when compiling html5ever][37373]
1538 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
1539 * [Avoid some allocations in the macro parser][37318]
1540 * [Use a faster deflate setting][37298]
1541 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
1542 during interning of slices][37270]
1543 * [Optimize `write_metadata`][37267]
1544 * [Don't process obligation forest cycles when stalled][37231]
1545 * [Avoid many `CrateConfig` clones][37161]
1546 * [Optimize `Substs::super_fold_with`][37108]
1547 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
1548 * [Speed up `plug_leaks`][36917]
1553 * [`println!()`, with no arguments, prints newline][36825].
1554 Previously, an empty string was required to achieve the same.
1555 * [`Wrapping` impls standard binary and unary operators, as well as
1556 the `Sum` and `Product` iterators][37356]
1557 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
1559 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
1560 `VecDeque` iterators][37315]
1561 * [Improve `SipHasher` performance on small values][37312]
1562 * [Add Iterator trait TrustedLen to enable better FromIterator /
1564 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
1565 * [`ReadDir` implements `Debug`][37221]
1566 * [Implement `RefUnwindSafe` for atomic types][37178]
1567 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
1568 * [Avoid allocations in `Decoder::read_str`][37064]
1569 * [`io::Error` implements `From<io::ErrorKind>`][37037]
1570 * [Impl `Debug` for raw pointers to unsized data][36880]
1571 * [Don't reuse `HashMap` random seeds][37470]
1572 * [The internal memory layout of `HashMap` is more cache-friendly, for
1573 significant improvements in some operations][36692]
1574 * [`HashMap` uses less memory on 32-bit architectures][36595]
1575 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
1580 * [Expose rustc cfg values to build scripts][cargo/3243]
1581 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
1582 * [Fix passing --features when testing multiple packages][cargo/3280]
1583 * [Use a single profile set per workspace][cargo/3249]
1584 * [Load `replace` sections from lock files][cargo/3220]
1585 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
1590 * [rustup is the recommended Rust installation method][1.14rustup]
1591 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
1592 S390x. These are [tier 2] platforms and may have major defects. Follow the
1593 instructions on the website to install, or add the targets to an existing
1594 installation with `rustup target add`. The new target triples are:
1595 - `mips-unknown-linux-gnu`
1596 - `mipsel-unknown-linux-gnu`
1597 - `mips64-unknown-linux-gnuabi64`
1598 - `mips64el-unknown-linux-gnuabi64 `
1599 - `powerpc-unknown-linux-gnu`
1600 - `powerpc64-unknown-linux-gnu`
1601 - `powerpc64le-unknown-linux-gnu`
1602 - `s390x-unknown-linux-gnu `
1603 * This release includes target (std) builds for ARM Linux running MUSL
1604 libc. These are [tier 2] platforms and may have major defects. Add the
1605 following triples to an existing rustup installation with `rustup target add`:
1606 - `arm-unknown-linux-musleabi`
1607 - `arm-unknown-linux-musleabihf`
1608 - `armv7-unknown-linux-musleabihf`
1609 * This release includes [experimental support for WebAssembly][1.14wasm], via
1610 the `wasm32-unknown-emscripten` target. This target is known to have major
1611 defects. Please test, report, and fix.
1612 * rustup no longer installs documentation by default. Run `rustup
1613 component add rust-docs` to install.
1614 * [Fix line stepping in debugger][37310]
1615 * [Enable line number debuginfo in releases][37280]
1620 * [Disable jemalloc on aarch64/powerpc/mips][37392]
1621 * [Add support for Fuchsia OS][37313]
1622 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
1627 * [A number of forward-compatibility lints used by the compiler
1628 to gradually introduce language changes have been converted
1629 to deny by default][36894]:
1630 - ["use of inaccessible extern crate erroneously allowed"][36886]
1631 - ["type parameter default erroneously allowed in invalid location"][36887]
1632 - ["detects super or self keywords at the beginning of global path"][36888]
1633 - ["two overlapping inherent impls define an item with the same name
1634 were erroneously allowed"][36889]
1635 - ["floating-point constants cannot be used in patterns"][36890]
1636 - ["constants of struct or enum type can only be used in a pattern if
1637 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
1638 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
1639 * [Prohibit patterns in trait methods without bodies][37378]
1640 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
1641 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
1642 * [The `$crate` macro variable is accepted in fewer locations][37213]
1643 * [Impls specifying extra region requirements beyond the trait
1644 they implement are rejected][37167]
1645 * [Enums may not be unsized][37111]. Unsized enums are intended to
1646 work but never have. For now they are forbidden.
1647 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
1649 [tier 2]: https://forge.rust-lang.org/platform-support.html
1650 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
1651 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
1652 [36430]: https://github.com/rust-lang/rust/pull/36430
1653 [36595]: https://github.com/rust-lang/rust/pull/36595
1654 [36595]: https://github.com/rust-lang/rust/pull/36595
1655 [36692]: https://github.com/rust-lang/rust/pull/36692
1656 [36767]: https://github.com/rust-lang/rust/pull/36767
1657 [36794]: https://github.com/rust-lang/rust/pull/36794
1658 [36798]: https://github.com/rust-lang/rust/pull/36798
1659 [36819]: https://github.com/rust-lang/rust/pull/36819
1660 [36822]: https://github.com/rust-lang/rust/pull/36822
1661 [36825]: https://github.com/rust-lang/rust/pull/36825
1662 [36843]: https://github.com/rust-lang/rust/pull/36843
1663 [36880]: https://github.com/rust-lang/rust/pull/36880
1664 [36886]: https://github.com/rust-lang/rust/issues/36886
1665 [36887]: https://github.com/rust-lang/rust/issues/36887
1666 [36888]: https://github.com/rust-lang/rust/issues/36888
1667 [36889]: https://github.com/rust-lang/rust/issues/36889
1668 [36890]: https://github.com/rust-lang/rust/issues/36890
1669 [36891]: https://github.com/rust-lang/rust/issues/36891
1670 [36892]: https://github.com/rust-lang/rust/issues/36892
1671 [36894]: https://github.com/rust-lang/rust/pull/36894
1672 [36917]: https://github.com/rust-lang/rust/pull/36917
1673 [36993]: https://github.com/rust-lang/rust/pull/36993
1674 [37037]: https://github.com/rust-lang/rust/pull/37037
1675 [37064]: https://github.com/rust-lang/rust/pull/37064
1676 [37094]: https://github.com/rust-lang/rust/pull/37094
1677 [37108]: https://github.com/rust-lang/rust/pull/37108
1678 [37111]: https://github.com/rust-lang/rust/pull/37111
1679 [37161]: https://github.com/rust-lang/rust/pull/37161
1680 [37162]: https://github.com/rust-lang/rust/pull/37162
1681 [37167]: https://github.com/rust-lang/rust/pull/37167
1682 [37178]: https://github.com/rust-lang/rust/pull/37178
1683 [37200]: https://github.com/rust-lang/rust/pull/37200
1684 [37213]: https://github.com/rust-lang/rust/pull/37213
1685 [37221]: https://github.com/rust-lang/rust/pull/37221
1686 [37224]: https://github.com/rust-lang/rust/pull/37224
1687 [37230]: https://github.com/rust-lang/rust/pull/37230
1688 [37231]: https://github.com/rust-lang/rust/pull/37231
1689 [37247]: https://github.com/rust-lang/rust/pull/37247
1690 [37267]: https://github.com/rust-lang/rust/pull/37267
1691 [37270]: https://github.com/rust-lang/rust/pull/37270
1692 [37273]: https://github.com/rust-lang/rust/pull/37273
1693 [37280]: https://github.com/rust-lang/rust/pull/37280
1694 [37298]: https://github.com/rust-lang/rust/pull/37298
1695 [37306]: https://github.com/rust-lang/rust/pull/37306
1696 [37310]: https://github.com/rust-lang/rust/pull/37310
1697 [37312]: https://github.com/rust-lang/rust/pull/37312
1698 [37313]: https://github.com/rust-lang/rust/pull/37313
1699 [37315]: https://github.com/rust-lang/rust/pull/37315
1700 [37318]: https://github.com/rust-lang/rust/pull/37318
1701 [37322]: https://github.com/rust-lang/rust/pull/37322
1702 [37326]: https://github.com/rust-lang/rust/pull/37326
1703 [37351]: https://github.com/rust-lang/rust/pull/37351
1704 [37356]: https://github.com/rust-lang/rust/pull/37356
1705 [37367]: https://github.com/rust-lang/rust/pull/37367
1706 [37373]: https://github.com/rust-lang/rust/pull/37373
1707 [37378]: https://github.com/rust-lang/rust/pull/37378
1708 [37389]: https://github.com/rust-lang/rust/pull/37389
1709 [37392]: https://github.com/rust-lang/rust/pull/37392
1710 [37427]: https://github.com/rust-lang/rust/pull/37427
1711 [37439]: https://github.com/rust-lang/rust/pull/37439
1712 [37445]: https://github.com/rust-lang/rust/pull/37445
1713 [37470]: https://github.com/rust-lang/rust/pull/37470
1714 [37569]: https://github.com/rust-lang/rust/pull/37569
1715 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1716 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
1717 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
1718 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
1719 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
1720 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
1721 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
1724 Version 1.13.0 (2016-11-10)
1725 ===========================
1730 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
1731 errors, like the `try!` macro, described in [RFC 0243].
1732 * [Stabilize macros in type position][36014]. Described in [RFC 873].
1733 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
1734 * [Fix `#[derive]` for empty tuple structs/variants][35728]
1735 * [Fix lifetime rules for 'if' conditions][36029]
1736 * [Avoid loading and parsing unconfigured non-inline modules][36482]
1741 * [Add the `-C link-arg` argument][36574]
1742 * [Remove the old AST-based backend from rustc_trans][35764]
1743 * [Don't enable NEON by default on armv7 Linux][35814]
1744 * [Fix debug line number info for macro expansions][35238]
1745 * [Do not emit "class method" debuginfo for types that are not
1746 DICompositeType][36008]
1747 * [Warn about multiple conflicting #[repr] hints][34623]
1748 * [When sizing DST, don't double-count nested struct prefixes][36351]
1749 * [Default RUST_MIN_STACK to 16MiB for now][36505]
1750 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
1751 * [Reject macros with empty repetitions to avoid infinite loop][36721]
1752 * [Expand macros without recursing to avoid stack overflows][36214]
1757 * [Replace macro backtraces with labeled local uses][35702]
1758 * [Improve error message for misplaced doc comments][33922]
1759 * [Buffer unix and lock windows to prevent message interleaving][35975]
1760 * [Update lifetime errors to specifically note temporaries][36171]
1761 * [Special case a few colors for Windows][36178]
1762 * [Suggest `use self` when such an import resolves][36289]
1763 * [Be more specific when type parameter shadows primitive type][36338]
1764 * Many minor improvements
1766 Compile-time Optimizations
1767 --------------------------
1769 * [Compute and cache HIR hashes at beginning][35854]
1770 * [Don't hash types in loan paths][36004]
1771 * [Cache projections in trans][35761]
1772 * [Optimize the parser's last token handling][36527]
1773 * [Only instantiate #[inline] functions in codegen units referencing
1774 them][36524]. This leads to big improvements in cases where crates export
1775 define many inline functions without using them directly.
1776 * [Lazily allocate TypedArena's first chunk][36592]
1777 * [Don't allocate during default HashSet creation][36734]
1784 * [`overflowing_abs`]
1785 * [`RefCell::try_borrow`]
1786 * [`RefCell::try_borrow_mut`]
1791 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
1792 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
1794 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
1795 * [Implement `Debug` for `std::vec::IntoIter`][35707]
1796 * [`CString`: avoid excessive growth just to 0-terminate][35871]
1797 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
1798 * [Use arc4rand on FreeBSD][35884]
1799 * [memrchr: Correct aligned offset computation][35969]
1800 * [Improve Demangling of Rust Symbols][36059]
1801 * [Use monotonic time in condition variables][35048]
1802 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
1803 * [Implement conversion traits for `char`][35755]
1804 * [Fix illegal instruction caused by overflow in channel cloning][36104]
1805 * [Zero first byte of CString on drop][36264]
1806 * [Inherit overflow checks for sum and product][36372]
1807 * [Add missing Eq implementations][36423]
1808 * [Implement `Debug` for `DirEntry`][36631]
1809 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
1811 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
1812 * [Implement more traits for `std::io::ErrorKind`][35911]
1813 * [Optimize BinaryHeap bounds checking][36072]
1814 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
1815 `extend_with_element`][36355]
1816 * [Fix overflow checking in unsigned pow()][34942]
1821 * This release includes security fixes to both curl and OpenSSL.
1822 * [Fix transitive doctests when panic=abort][cargo/3021]
1823 * [Add --all-features flag to cargo][cargo/3038]
1824 * [Reject path-based dependencies in `cargo package`][cargo/3060]
1825 * [Don't parse the home directory more than once][cargo/3078]
1826 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
1827 * [Update OpenSSL to 1.0.2j][cargo/3121]
1828 * [Add license and license_file to cargo metadata output][cargo/3110]
1829 * [Make crates-io registry URL optional in config; ignore all changes to
1830 source.crates-io][cargo/3089]
1831 * [Don't download dependencies from other platforms][cargo/3123]
1832 * [Build transitive dev-dependencies when needed][cargo/3125]
1833 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
1834 * [Avoid updating registry when adding existing deps][cargo/3144]
1835 * [Warn about path overrides that won't work][cargo/3136]
1836 * [Use workspaces during `cargo install`][cargo/3146]
1837 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
1838 * [Add --message-format flag][cargo/3000]
1839 * [Pass target environment for rustdoc][cargo/3205]
1840 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
1841 * [Update curl and curl-sys][cargo/3241]
1842 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
1847 * [rustdoc: Add the `--sysroot` argument][36586]
1848 * [rustdoc: Fix a couple of issues with the search results][35655]
1849 * [rustdoc: remove the `!` from macro URLs and titles][35234]
1850 * [gdb: Fix pretty-printing special-cased Rust types][35585]
1851 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
1856 * [Remove unmaintained style guide][35124]
1857 * [Add s390x support][36369]
1858 * [Initial work at Haiku OS support][36727]
1859 * [Add mips-uclibc targets][35734]
1860 * [Crate-ify compiler-rt into compiler-builtins][35021]
1861 * [Add rustc version info (git hash + date) to dist tarball][36213]
1862 * Many documentation improvements
1867 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
1868 * [Deny (by default) transmuting from fn item types to pointer-sized
1869 types][34923]. Continuing the long transition to zero-sized fn items,
1871 * [Fix `#[derive]` for empty tuple structs/variants][35728].
1873 * [Issue deprecation warnings for safe accesses to extern statics][36173]
1874 * [Fix lifetime rules for 'if' conditions][36029].
1875 * [Inherit overflow checks for sum and product][36372].
1876 * [Forbid user-defined macros named "macro_rules"][36730].
1878 [33922]: https://github.com/rust-lang/rust/pull/33922
1879 [34623]: https://github.com/rust-lang/rust/pull/34623
1880 [34923]: https://github.com/rust-lang/rust/pull/34923
1881 [34942]: https://github.com/rust-lang/rust/pull/34942
1882 [34982]: https://github.com/rust-lang/rust/pull/34982
1883 [35021]: https://github.com/rust-lang/rust/pull/35021
1884 [35048]: https://github.com/rust-lang/rust/pull/35048
1885 [35074]: https://github.com/rust-lang/rust/pull/35074
1886 [35124]: https://github.com/rust-lang/rust/pull/35124
1887 [35234]: https://github.com/rust-lang/rust/pull/35234
1888 [35238]: https://github.com/rust-lang/rust/pull/35238
1889 [35354]: https://github.com/rust-lang/rust/pull/35354
1890 [35559]: https://github.com/rust-lang/rust/pull/35559
1891 [35585]: https://github.com/rust-lang/rust/pull/35585
1892 [35627]: https://github.com/rust-lang/rust/pull/35627
1893 [35655]: https://github.com/rust-lang/rust/pull/35655
1894 [35702]: https://github.com/rust-lang/rust/pull/35702
1895 [35707]: https://github.com/rust-lang/rust/pull/35707
1896 [35728]: https://github.com/rust-lang/rust/pull/35728
1897 [35734]: https://github.com/rust-lang/rust/pull/35734
1898 [35755]: https://github.com/rust-lang/rust/pull/35755
1899 [35761]: https://github.com/rust-lang/rust/pull/35761
1900 [35764]: https://github.com/rust-lang/rust/pull/35764
1901 [35814]: https://github.com/rust-lang/rust/pull/35814
1902 [35854]: https://github.com/rust-lang/rust/pull/35854
1903 [35871]: https://github.com/rust-lang/rust/pull/35871
1904 [35884]: https://github.com/rust-lang/rust/pull/35884
1905 [35911]: https://github.com/rust-lang/rust/pull/35911
1906 [35969]: https://github.com/rust-lang/rust/pull/35969
1907 [35975]: https://github.com/rust-lang/rust/pull/35975
1908 [36004]: https://github.com/rust-lang/rust/pull/36004
1909 [36008]: https://github.com/rust-lang/rust/pull/36008
1910 [36014]: https://github.com/rust-lang/rust/pull/36014
1911 [36029]: https://github.com/rust-lang/rust/pull/36029
1912 [36059]: https://github.com/rust-lang/rust/pull/36059
1913 [36072]: https://github.com/rust-lang/rust/pull/36072
1914 [36101]: https://github.com/rust-lang/rust/pull/36101
1915 [36104]: https://github.com/rust-lang/rust/pull/36104
1916 [36171]: https://github.com/rust-lang/rust/pull/36171
1917 [36173]: https://github.com/rust-lang/rust/pull/36173
1918 [36178]: https://github.com/rust-lang/rust/pull/36178
1919 [36213]: https://github.com/rust-lang/rust/pull/36213
1920 [36214]: https://github.com/rust-lang/rust/pull/36214
1921 [36264]: https://github.com/rust-lang/rust/pull/36264
1922 [36266]: https://github.com/rust-lang/rust/pull/36266
1923 [36289]: https://github.com/rust-lang/rust/pull/36289
1924 [36338]: https://github.com/rust-lang/rust/pull/36338
1925 [36351]: https://github.com/rust-lang/rust/pull/36351
1926 [36355]: https://github.com/rust-lang/rust/pull/36355
1927 [36369]: https://github.com/rust-lang/rust/pull/36369
1928 [36372]: https://github.com/rust-lang/rust/pull/36372
1929 [36423]: https://github.com/rust-lang/rust/pull/36423
1930 [36482]: https://github.com/rust-lang/rust/pull/36482
1931 [36505]: https://github.com/rust-lang/rust/pull/36505
1932 [36524]: https://github.com/rust-lang/rust/pull/36524
1933 [36527]: https://github.com/rust-lang/rust/pull/36527
1934 [36551]: https://github.com/rust-lang/rust/pull/36551
1935 [36574]: https://github.com/rust-lang/rust/pull/36574
1936 [36586]: https://github.com/rust-lang/rust/pull/36586
1937 [36592]: https://github.com/rust-lang/rust/pull/36592
1938 [36631]: https://github.com/rust-lang/rust/pull/36631
1939 [36639]: https://github.com/rust-lang/rust/pull/36639
1940 [36721]: https://github.com/rust-lang/rust/pull/36721
1941 [36727]: https://github.com/rust-lang/rust/pull/36727
1942 [36730]: https://github.com/rust-lang/rust/pull/36730
1943 [36734]: https://github.com/rust-lang/rust/pull/36734
1944 [36754]: https://github.com/rust-lang/rust/pull/36754
1945 [36995]: https://github.com/rust-lang/rust/pull/36995
1946 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
1947 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
1948 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
1949 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
1950 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
1951 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
1952 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
1953 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
1954 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
1955 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
1956 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
1957 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
1958 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
1959 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
1960 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
1961 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
1962 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
1963 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
1964 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
1965 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
1966 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
1967 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
1968 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
1969 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
1970 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
1971 [rustup]: https://www.rustup.rs
1972 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
1973 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
1974 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
1975 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
1976 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
1977 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
1978 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
1981 Version 1.12.1 (2016-10-20)
1982 ===========================
1987 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
1988 * [Confusion with double negation and booleans][36856]
1989 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
1990 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
1991 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
1992 * [Corrupted memory after updated to 1.12][36936]
1993 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
1994 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
1995 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
1997 [36381]: https://github.com/rust-lang/rust/issues/36381
1998 [36856]: https://github.com/rust-lang/rust/issues/36856
1999 [36875]: https://github.com/rust-lang/rust/issues/36875
2000 [36924]: https://github.com/rust-lang/rust/issues/36924
2001 [36926]: https://github.com/rust-lang/rust/issues/36926
2002 [36936]: https://github.com/rust-lang/rust/issues/36936
2003 [37026]: https://github.com/rust-lang/rust/issues/37026
2004 [37112]: https://github.com/rust-lang/rust/issues/37112
2005 [37153]: https://github.com/rust-lang/rust/issues/37153
2008 Version 1.12.0 (2016-09-29)
2009 ===========================
2014 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2015 This translation pass is far simpler than the previous AST->LLVM pass, and
2016 creates opportunities to perform new optimizations directly on the MIR. It
2017 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2018 * [`rustc` presents a new, more readable error format, along with
2019 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2020 Most common editors supporting Rust have been updated to work with it. It was
2021 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2026 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2027 This translation pass is far simpler than the previous AST->LLVM pass, and
2028 creates opportunities to perform new optimizations directly on the MIR. It
2029 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2030 * [Print the Rust target name, not the LLVM target name, with
2031 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
2032 * [The computation of `TypeId` is correct in some cases where it was previously
2033 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
2034 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
2035 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
2036 `--print relocation-models`, and `--print code-models` print the available
2037 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
2038 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
2039 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
2040 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
2041 These targets produce statically-linked binaries. There are no binary release
2047 * [`rustc` presents a new, more readable error format, along with
2048 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2049 Most common editors supporting Rust have been updated to work with it. It was
2050 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2051 * [In error descriptions, references are now described in plain English,
2052 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
2053 * [In error type descriptions, unknown numeric types are named `{integer}` or
2054 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
2055 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
2060 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
2061 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
2062 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
2063 useful](https://github.com/rust-lang/rust/pull/34908)
2064 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
2065 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
2066 * [Semicolons are properly required as statement delimiters inside
2067 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
2068 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2073 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
2074 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
2075 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
2076 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
2077 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
2078 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
2079 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
2080 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
2081 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
2082 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
2083 Both on Unix and Windows.
2084 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
2085 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
2086 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
2087 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
2088 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
2089 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
2090 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
2091 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
2096 * [The `format!` macro and friends now allow a single argument to be formatted
2097 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
2098 * [The lifetime bounds on `[T]::binary_search_by` and
2099 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
2100 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
2101 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
2102 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
2103 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
2104 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
2105 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
2106 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
2107 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
2108 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
2109 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
2110 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
2111 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
2112 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
2113 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
2114 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
2115 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
2116 * [`mpsc::sync_channel` `Receiver`s return any available message before
2117 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
2118 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
2119 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
2124 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
2125 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
2126 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
2127 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
2128 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
2129 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
2130 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
2131 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
2132 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
2133 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
2134 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
2135 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
2136 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
2137 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
2138 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
2139 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
2144 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
2145 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
2150 * [Test binaries now support a `--test-threads` argument to specify the number
2151 of threads used to run tests, and which acts the same as the
2152 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
2153 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
2154 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
2155 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2156 * [Rust releases now come with source packages that can be installed by rustup
2157 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
2158 The resulting source code can be used by tools and IDES, located in the
2159 sysroot under `lib/rustlib/src`.
2164 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
2165 * Many minor improvements to the documentation.
2166 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
2171 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
2172 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
2173 * [When formatting strings, if "precision" is specified, the "fill",
2174 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
2175 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
2178 Version 1.11.0 (2016-08-18)
2179 ===========================
2184 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2185 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
2186 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
2187 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
2188 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
2193 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
2194 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
2195 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
2196 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
2197 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
2198 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
2199 (in libcore - previously stabilized in libstd)
2200 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
2201 (in libcore - previously stabilized in libstd)
2202 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
2203 (in libcore - previously stabilized in libstd)
2204 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
2205 (in libcore - previously stabilized in libstd)
2206 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2207 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2208 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
2209 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
2214 * [The `thread_local!` macro supports multiple definitions in a single
2215 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
2216 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
2217 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
2218 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
2219 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
2220 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
2221 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
2222 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
2227 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
2228 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
2229 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
2230 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
2231 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
2232 and `-vv` prints warnings for all crates.
2233 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
2234 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
2235 This provides room for expansion by arbitrary tools.
2236 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
2237 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
2238 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
2239 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
2240 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
2241 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
2242 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
2247 * [Caching projections speeds up type check dramatically for some
2248 workloads](https://github.com/rust-lang/rust/pull/33816)
2249 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
2250 This hasher is faster, but is believed to provide sufficient
2251 protection from collision attacks.
2252 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
2257 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
2258 * [Fix inlined renamed reexports in import lists](https://github.com/rust-lang/rust/pull/34479)
2259 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
2260 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
2261 * [Fix redirect pages for renamed reexports](https://github.com/rust-lang/rust/pull/34245)
2266 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
2267 * [When emitting debug info, rustc emits frame pointers for closures,
2268 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
2269 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2270 * Many more errors have been given error codes and extended
2272 * API documentation continues to be improved, with many new examples
2277 * [rustc no longer hangs when dependencies recursively re-export
2278 submodules](https://github.com/rust-lang/rust/pull/34542)
2279 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
2280 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
2281 rewritten](https://github.com/rust-lang/rust/pull/33895)
2282 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
2283 No targets use this yet, but it works toward AVR support.
2288 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
2289 * [The new follow-set rules that place restrictions on `macro_rules!`
2290 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
2291 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
2292 and has been a warning since 1.10.
2293 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
2294 This causes breakage in some corner cases.
2297 Version 1.10.0 (2016-07-07)
2298 ===========================
2303 * [Allow `concat_idents!` in type positions as well as in expression
2304 positions](https://github.com/rust-lang/rust/pull/33735).
2305 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
2306 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
2307 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
2308 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
2309 * [`panic!` can be converted to a runtime abort with the
2310 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
2311 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2312 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
2313 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
2314 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-rdylib.md).
2315 Note that Cargo does not yet directly support cdylibs.
2320 * `os::windows::fs::OpenOptionsExt::access_mode`
2321 * `os::windows::fs::OpenOptionsExt::share_mode`
2322 * `os::windows::fs::OpenOptionsExt::custom_flags`
2323 * `os::windows::fs::OpenOptionsExt::attributes`
2324 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
2325 * `os::unix::fs::OpenOptionsExt::custom_flags`
2326 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
2327 * `Default for sync::Weak`
2328 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
2329 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
2330 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
2331 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
2332 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
2333 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
2334 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
2335 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
2336 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
2337 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
2338 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
2339 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
2340 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
2341 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
2342 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
2343 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
2344 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
2345 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
2346 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
2347 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
2348 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
2349 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
2350 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
2351 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
2352 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
2353 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2354 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2355 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2356 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2357 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
2358 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
2359 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
2360 * Read/Write/RawFd impls for `UnixStream`
2361 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
2362 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
2363 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
2364 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
2365 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
2366 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
2367 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
2368 * RawFd impls for `UnixListener`
2369 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
2370 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
2371 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
2372 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
2373 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
2374 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
2375 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
2376 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
2377 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
2378 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
2379 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
2380 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
2381 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
2382 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
2383 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
2384 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
2385 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
2386 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
2387 * RawFd impls for `UnixDatagram`
2388 * `{BTree,Hash}Map::values_mut`
2389 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
2394 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
2395 The semantics of this minor method are subtle and probably not what
2397 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
2398 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
2399 will fall back to `/dev/urandom` temporarily to avoid blocking
2400 during early boot](https://github.com/rust-lang/rust/pull/33086).
2401 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
2402 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
2403 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
2404 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
2405 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
2406 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
2407 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
2411 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
2412 This controls the runtime behavior of the `panic!` macro
2413 and can be either "unwind" (the default), or "abort".
2414 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2415 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
2416 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
2417 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
2418 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
2419 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
2420 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
2421 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
2422 By default they are retried twice, which can be customized with the
2423 `net.retry` value in `.cargo/config`.
2424 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
2425 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
2426 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
2427 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
2428 Makes it possible to install multiple crates in parallel.
2429 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
2430 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
2431 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
2432 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
2433 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
2434 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
2439 * [rustc memory usage was reduced by refactoring the context used for
2440 type checking](https://github.com/rust-lang/rust/pull/33425).
2441 * [Speed up creation of `HashMap`s by caching the random keys used
2442 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
2443 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
2444 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
2445 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
2446 10x faster than the previous lookup tables.
2447 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
2452 * Many incremental improvements to documentation and rustdoc.
2453 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
2454 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
2455 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
2456 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
2457 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
2458 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
2459 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
2464 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
2465 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
2466 * [`std` no longer prints backtraces on platforms where the running
2467 module must be loaded with `env::current_exe`, which can't be relied
2468 on](https://github.com/rust-lang/rust/pull/33554).
2469 * This release includes std binaries for the i586-unknown-linux-gnu,
2470 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
2471 i586 target is for old x86 hardware without SSE2, and the armv7
2472 target is for Android running on modern ARM architectures.
2473 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
2474 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
2475 * [On Unix the runtime aborts by calling `libc::abort` instead of
2476 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
2477 * [Rust is now bootstrapped from the previous release of Rust,
2478 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
2483 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
2484 * [`target_env` for Linux ARM targets is just `gnu`, not
2485 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
2486 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
2487 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
2488 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
2489 Affects how macros are parsed.
2490 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
2491 * [Feature-gated attributes on macro-generated macro invocations are
2492 now rejected](https://github.com/rust-lang/rust/pull/32791).
2493 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
2494 This caused some minor changes to type inference.
2497 Version 1.9.0 (2016-05-26)
2498 ==========================
2503 * The `#[deprecated]` attribute when applied to an API will generate
2504 warnings when used. The warnings may be suppressed with
2505 `#[allow(deprecated)]`. [RFC 1270].
2506 * [`fn` item types are zero sized, and each `fn` names a unique
2507 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2508 `transmute` on a `fn` type will generate a warning for a few cycles,
2509 then will be converted to an error.
2510 * [Field and method resolution understand visibility, so private
2511 fields and methods cannot prevent the proper use of public fields
2512 and methods][1.9fv].
2513 * [The parser considers unicode codepoints in the
2514 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
2520 * [`std::panic::catch_unwind`][] (renamed from `recover`)
2521 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
2522 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
2523 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
2524 * [`str::is_char_boundary`]
2525 * [`<*const T>::as_ref`]
2526 * [`<*mut T>::as_ref`]
2527 * [`<*mut T>::as_mut`]
2528 * [`AsciiExt::make_ascii_uppercase`]
2529 * [`AsciiExt::make_ascii_lowercase`]
2530 * [`char::decode_utf16`]
2531 * [`char::DecodeUtf16`]
2532 * [`char::DecodeUtf16Error`]
2533 * [`char::DecodeUtf16Error::unpaired_surrogate`]
2534 * [`BTreeSet::take`]
2535 * [`BTreeSet::replace`]
2538 * [`HashSet::replace`]
2540 * [`OsString::with_capacity`]
2541 * [`OsString::clear`]
2542 * [`OsString::capacity`]
2543 * [`OsString::reserve`]
2544 * [`OsString::reserve_exact`]
2545 * [`OsStr::is_empty`]
2547 * [`std::os::unix::thread`]
2550 * [`JoinHandleExt::as_pthread_t`]
2551 * [`JoinHandleExt::into_pthread_t`]
2552 * [`HashSet::hasher`]
2553 * [`HashMap::hasher`]
2554 * [`CommandExt::exec`]
2555 * [`File::try_clone`]
2556 * [`SocketAddr::set_ip`]
2557 * [`SocketAddr::set_port`]
2558 * [`SocketAddrV4::set_ip`]
2559 * [`SocketAddrV4::set_port`]
2560 * [`SocketAddrV6::set_ip`]
2561 * [`SocketAddrV6::set_port`]
2562 * [`SocketAddrV6::set_flowinfo`]
2563 * [`SocketAddrV6::set_scope_id`]
2564 * [`slice::copy_from_slice`]
2565 * [`ptr::read_volatile`]
2566 * [`ptr::write_volatile`]
2567 * [`OpenOptions::create_new`]
2568 * [`TcpStream::set_nodelay`]
2569 * [`TcpStream::nodelay`]
2570 * [`TcpStream::set_ttl`]
2571 * [`TcpStream::ttl`]
2572 * [`TcpStream::set_only_v6`]
2573 * [`TcpStream::only_v6`]
2574 * [`TcpStream::take_error`]
2575 * [`TcpStream::set_nonblocking`]
2576 * [`TcpListener::set_ttl`]
2577 * [`TcpListener::ttl`]
2578 * [`TcpListener::set_only_v6`]
2579 * [`TcpListener::only_v6`]
2580 * [`TcpListener::take_error`]
2581 * [`TcpListener::set_nonblocking`]
2582 * [`UdpSocket::set_broadcast`]
2583 * [`UdpSocket::broadcast`]
2584 * [`UdpSocket::set_multicast_loop_v4`]
2585 * [`UdpSocket::multicast_loop_v4`]
2586 * [`UdpSocket::set_multicast_ttl_v4`]
2587 * [`UdpSocket::multicast_ttl_v4`]
2588 * [`UdpSocket::set_multicast_loop_v6`]
2589 * [`UdpSocket::multicast_loop_v6`]
2590 * [`UdpSocket::set_multicast_ttl_v6`]
2591 * [`UdpSocket::multicast_ttl_v6`]
2592 * [`UdpSocket::set_ttl`]
2593 * [`UdpSocket::ttl`]
2594 * [`UdpSocket::set_only_v6`]
2595 * [`UdpSocket::only_v6`]
2596 * [`UdpSocket::join_multicast_v4`]
2597 * [`UdpSocket::join_multicast_v6`]
2598 * [`UdpSocket::leave_multicast_v4`]
2599 * [`UdpSocket::leave_multicast_v6`]
2600 * [`UdpSocket::take_error`]
2601 * [`UdpSocket::connect`]
2602 * [`UdpSocket::send`]
2603 * [`UdpSocket::recv`]
2604 * [`UdpSocket::set_nonblocking`]
2609 * [`std::sync::Once` is poisoned if its initialization function
2611 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
2612 * [Most types implement `fmt::Debug`][1.9db].
2613 * [The default buffer size used by `BufReader` and `BufWriter` was
2614 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
2615 used by other languages.
2616 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
2617 `Duration` additionally implements `*=` and `/=`][1.9ta].
2618 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
2619 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
2620 * [`Chain` implements `BufRead`][1.9ch].
2621 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
2626 * [Cargo can now run concurrently][1.9cc].
2627 * [Top-level overrides allow specific revisions of crates to be
2628 overridden through the entire crate graph][1.9ct]. This is intended
2629 to make upgrades easier for large projects, by allowing crates to be
2630 forked temporarily until they've been upgraded and republished.
2631 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
2632 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
2633 on the commandline][1.9cf]. `rustc` arguments can also be specified
2634 in the `build.rustflags` configuration key.
2639 * [The time complexity of comparing variables for equivalence during type
2640 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
2641 to major compilation time improvement in some scenarios.
2642 * [`ToString` is specialized for `str`, giving it the same performance
2643 as `to_owned`][1.9ts].
2644 * [Spawning processes with `Command::output` no longer creates extra
2646 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
2647 for C-like enums][1.9cl].
2652 * [Passing the `--quiet` flag to a test runner will produce
2653 much-abbreviated output][1.9q].
2654 * The Rust Project now publishes std binaries for the
2655 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
2656 `i586-pc-windows-msvc` targets.
2661 * [`std::sync::Once` is poisoned if its initialization function
2663 * [It is illegal to define methods with the same name in overlapping
2664 inherent `impl` blocks][1.9sn].
2665 * [`fn` item types are zero sized, and each `fn` names a unique
2666 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2667 `transmute` on a `fn` type will generate a warning for a few cycles,
2668 then will be converted to an error.
2669 * [Improvements to const evaluation may trigger new errors when integer
2670 literals are out of range][1.9ce].
2673 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
2674 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
2675 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
2676 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
2677 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
2678 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
2679 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
2680 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
2681 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
2682 [1.9db]: https://github.com/rust-lang/rust/pull/32054
2683 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
2684 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
2685 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
2686 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
2687 [1.9o]: https://github.com/rust-lang/rust/pull/32325
2688 [1.9q]: https://github.com/rust-lang/rust/pull/31887
2689 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
2690 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
2691 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
2692 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
2693 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
2694 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
2695 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
2696 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
2697 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2698 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
2699 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2700 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
2701 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
2702 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
2703 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
2704 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
2705 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
2706 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
2707 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
2708 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
2709 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
2710 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
2711 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
2712 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
2713 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
2714 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
2715 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
2716 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
2717 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
2718 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
2719 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
2720 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
2721 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
2722 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
2723 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
2724 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
2725 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
2726 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
2727 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
2728 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
2729 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
2730 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
2731 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
2732 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
2733 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2734 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2735 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2736 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2737 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2738 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2739 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
2740 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2741 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
2742 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2743 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2744 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2745 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2746 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2747 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
2748 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
2749 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
2750 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
2751 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
2752 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
2753 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
2754 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
2755 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
2756 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
2757 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
2758 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
2759 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
2760 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
2761 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
2762 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
2763 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
2764 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
2765 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
2766 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
2767 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
2768 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
2769 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
2770 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
2771 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
2772 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
2773 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
2774 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
2775 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
2776 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
2777 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
2778 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
2779 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
2780 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
2781 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
2782 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
2785 Version 1.8.0 (2016-04-14)
2786 ==========================
2791 * Rust supports overloading of compound assignment statements like
2792 `+=` by implementing the [`AddAssign`], [`SubAssign`],
2793 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
2794 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
2796 * Empty structs can be defined with braces, as in `struct Foo { }`, in
2797 addition to the non-braced form, `struct Foo;`. [RFC 218].
2803 * [`str::encode_utf16`][] (renamed from `utf16_units`)
2804 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
2807 * [`ptr::drop_in_place`]
2809 * [`time::SystemTime`]
2811 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
2812 * [`Instant::elapsed`]
2813 * [`SystemTime::now`]
2814 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
2815 * [`SystemTime::elapsed`]
2816 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
2817 * [`SystemTimeError`]
2818 * [`SystemTimeError::duration`]
2819 * Various impls for `SystemTimeError`
2821 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
2822 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
2823 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
2824 * [The `write!` and `writeln!` macros correctly emit errors if any of
2825 their arguments can't be formatted][1.8w].
2826 * [Various I/O functions support large files on 32-bit Linux][1.8l].
2827 * [The Unix-specific `raw` modules, which contain a number of
2828 redefined C types are deprecated][1.8r], including `os::raw::unix`,
2829 `os::raw::macos`, and `os::raw::linux`. These modules defined types
2830 such as `ino_t` and `dev_t`. The inconsistency of these definitions
2831 across platforms was making it difficult to implement `std`
2832 correctly. Those that need these definitions should use the `libc`
2834 * The Unix-specific `MetadataExt` traits, including
2835 `os::unix::fs::MetadataExt`, which expose values such as inode
2836 numbers [no longer return platform-specific types][1.8r], but
2837 instead return widened integers. [RFC 1415].
2838 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
2839 * [Atomic loads and stores are not volatile][1.8a].
2840 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
2845 * [Inlining hash functions lead to a 3% compile-time improvement in
2846 some workloads][1.8h].
2847 * When using jemalloc, its symbols are [unprefixed so that it
2848 overrides the libc malloc implementation][1.8h]. This means that for
2849 rustc, LLVM is now using jemalloc, which results in a 6%
2850 compile-time improvement on a specific workload.
2851 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
2856 * [32-bit MSVC builds finally implement unwinding][1.8ms].
2857 i686-pc-windows-msvc is now considered a tier-1 platform.
2858 * [The `--print targets` flag prints a list of supported targets][1.8t].
2859 * [The `--print cfg` flag prints the `cfg`s defined for the current
2861 * [`rustc` can be built with an new Cargo-based build system, written
2862 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
2863 build system. To enable it configure with `configure --rustbuild`.
2864 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
2865 variants while also indicating the total number of missing variants
2866 if more than 3][1.8m].
2867 * [Executable stacks are disabled on Linux and BSD][1.8nx].
2868 * The Rust Project now publishes binary releases of the standard
2869 library for a number of tier-2 targets:
2870 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
2871 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
2872 `x86_64-rumprun-netbsd`. These can be installed with
2873 tools such as [multirust][1.8mr].
2878 * [`cargo init` creates a new Cargo project in the current
2879 directory][1.8ci]. It is otherwise like `cargo new`.
2880 * [Cargo has configuration keys for `-v` and
2881 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
2882 `[term]` section of `.cargo/config`.
2883 * [Configuration keys that evaluate to strings or integers can be set
2884 via environment variables][1.8ce]. For example the `build.jobs` key
2885 can be set via `CARGO_BUILD_JOBS`. Environment variables take
2886 precedence over config files.
2887 * [Target-specific dependencies support Rust `cfg` syntax for
2888 describing targets][1.8cfg] so that dependencies for multiple
2889 targets can be specified together. [RFC 1361].
2890 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
2891 `RUSTDOC` take precedence over the `build.target-dir`,
2892 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
2893 * [The child process tree is killed on Windows when Cargo is
2895 * [The `build.target` configuration value sets the target platform,
2896 like `--target`][1.8ct].
2901 * [Unstable compiler flags have been further restricted][1.8u]. Since
2902 1.0 `-Z` flags have been considered unstable, and other flags that
2903 were considered unstable additionally required passing `-Z
2904 unstable-options` to access. Unlike unstable language and library
2905 features though, these options have been accessible on the stable
2906 release channel. Going forward, *new unstable flags will not be
2907 available on the stable release channel*, and old unstable flags
2908 will warn about their usage. In the future, all unstable flags will
2909 be unavailable on the stable release channel.
2910 * [It is no longer possible to `match` on empty enum variants using
2911 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
2912 * The Unix-specific `MetadataExt` traits, including
2913 `os::unix::fs::MetadataExt`, which expose values such as inode
2914 numbers [no longer return platform-specific types][1.8r], but
2915 instead return widened integers. [RFC 1415].
2916 * [Modules sourced from the filesystem cannot appear within arbitrary
2917 blocks, but only within other modules][1.8mf].
2918 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
2919 * On Unix, [stack overflow triggers a runtime abort instead of a
2921 * [`Command::spawn` and its equivalents return an error if any of
2922 its command-line arguments contain interior `NUL`s][1.8n].
2923 * [Tuple and unit enum variants from other crates are in the type
2925 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
2926 type instead of `.a` files][1.8st]. Additionally, for the MSVC
2927 toolchain, `rustc` emits import libraries named `foo.dll.lib`
2928 instead of `foo.lib`.
2931 [1.8a]: https://github.com/rust-lang/rust/pull/30962
2932 [1.8b]: https://github.com/rust-lang/rust/pull/31123
2933 [1.8c]: https://github.com/rust-lang/rust/pull/31530
2934 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
2935 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
2936 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
2937 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
2938 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
2939 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
2940 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
2941 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
2942 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
2943 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
2944 [1.8h]: https://github.com/rust-lang/rust/pull/31460
2945 [1.8l]: https://github.com/rust-lang/rust/pull/31668
2946 [1.8m]: https://github.com/rust-lang/rust/pull/31020
2947 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
2948 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
2949 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
2950 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
2951 [1.8n]: https://github.com/rust-lang/rust/pull/31056
2952 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
2953 [1.8r]: https://github.com/rust-lang/rust/pull/31551
2954 [1.8so]: https://github.com/rust-lang/rust/pull/31333
2955 [1.8st]: https://github.com/rust-lang/rust/pull/29520
2956 [1.8t]: https://github.com/rust-lang/rust/pull/31358
2957 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
2958 [1.8u]: https://github.com/rust-lang/rust/pull/31793
2959 [1.8v]: https://github.com/rust-lang/rust/pull/31757
2960 [1.8w]: https://github.com/rust-lang/rust/pull/31904
2961 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
2962 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
2963 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
2964 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
2965 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
2966 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
2967 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
2968 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
2969 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
2970 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
2971 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
2972 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
2973 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
2974 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
2975 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
2976 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
2977 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
2978 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
2979 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
2980 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
2981 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
2982 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
2983 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
2984 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
2985 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
2986 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
2987 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
2988 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
2989 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
2990 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
2993 Version 1.7.0 (2016-03-03)
2994 ==========================
3001 * [`Path::strip_prefix`][] (renamed from relative_from)
3002 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
3004 * [`Ipv4Addr::is_loopback`]
3005 * [`Ipv4Addr::is_private`]
3006 * [`Ipv4Addr::is_link_local`]
3007 * [`Ipv4Addr::is_multicast`]
3008 * [`Ipv4Addr::is_broadcast`]
3009 * [`Ipv4Addr::is_documentation`]
3011 * [`Ipv6Addr::is_unspecified`]
3012 * [`Ipv6Addr::is_loopback`]
3013 * [`Ipv6Addr::is_multicast`]
3016 * [`Vec::as_mut_slice`]
3018 * [`String::as_str`]
3019 * [`String::as_mut_str`]
3021 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
3023 * `<[T]>::`[`sort_by_key`]
3024 * checked, saturated, and overflowing operations
3025 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
3026 * [`i32::saturating_mul`]
3027 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
3028 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
3029 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
3030 * [`u32::saturating_mul`]
3031 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
3032 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
3033 * and checked, saturated, and overflowing operations for other primitive types
3035 * [`ffi::IntoStringError`]
3036 * [`CString::into_string`]
3037 * [`CString::into_bytes`]
3038 * [`CString::into_bytes_with_nul`]
3039 * `From<CString> for Vec<u8>`
3041 * [`IntoStringError::into_cstring`]
3042 * [`IntoStringError::utf8_error`]
3043 * `Error for IntoStringError`
3045 * [`std::hash::BuildHasher`]
3046 * [`BuildHasher::Hasher`]
3047 * [`BuildHasher::build_hasher`]
3048 * [`std::hash::BuildHasherDefault`]
3049 * [`HashMap::with_hasher`]
3050 * [`HashMap::with_capacity_and_hasher`]
3051 * [`HashSet::with_hasher`]
3052 * [`HashSet::with_capacity_and_hasher`]
3053 * [`std::collections::hash_map::RandomState`]
3054 * [`RandomState::new`]
3055 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
3056 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
3057 from bytes is faster.
3058 * [The performance of `LineWriter` (and thus `io::stdout`) was
3059 improved by using `memchr` to search for newlines][1.7m].
3060 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
3061 `f64` variants were stabilized previously.
3062 * [`BTreeMap` was rewritten to use less memory and improve the performance
3063 of insertion and iteration, the latter by as much as 5x][1.7bm].
3064 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
3065 covariant over their contained type][1.7bt].
3066 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
3067 over their contained type][1.7ll].
3068 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
3070 * [`Any` is implemented for unsized types][1.7a].
3071 * [`Hash` is implemented for `Duration`][1.7h].
3076 * [When running tests with `--test`, rustdoc will pass `--cfg`
3077 arguments to the compiler][1.7dt].
3078 * [The compiler is built with RPATH information by default][1.7rpa].
3079 This means that it will be possible to run `rustc` when installed in
3080 unusual configurations without configuring the dynamic linker search
3082 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
3083 any RPATH entries (emitted with `-C rpath`) *not* take precedence
3084 over `LD_LIBRARY_PATH`.
3089 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
3090 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
3091 * [The `rerun-if-changed` build script directive no longer causes the
3092 build script to incorrectly run twice in certain scenarios][1.7rr].
3097 * Soundness fixes to the interactions between associated types and
3098 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
3099 code that violates the new rules. This is a significant change that
3100 is known to break existing code, so it has emitted warnings for the
3101 new error cases since 1.4 to give crate authors time to adapt. The
3102 details of what is changing are subtle; read the RFC for more.
3103 * [Several bugs in the compiler's visibility calculations were
3104 fixed][1.7v]. Since this was found to break significant amounts of
3105 code, the new errors will be emitted as warnings for several release
3106 cycles, under the `private_in_public` lint.
3107 * Defaulted type parameters were accidentally accepted in positions
3108 that were not intended. In this release, [defaulted type parameters
3109 appearing outside of type definitions will generate a
3110 warning][1.7d], which will become an error in future releases.
3111 * [Parsing "." as a float results in an error instead of 0][1.7p].
3112 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
3113 * [Borrows of closure parameters may not outlive the closure][1.7bc].
3115 [1.7a]: https://github.com/rust-lang/rust/pull/30928
3116 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
3117 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
3118 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
3119 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
3120 [1.7d]: https://github.com/rust-lang/rust/pull/30724
3121 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
3122 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
3123 [1.7f]: https://github.com/rust-lang/rust/pull/30672
3124 [1.7h]: https://github.com/rust-lang/rust/pull/30818
3125 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
3126 [1.7m]: https://github.com/rust-lang/rust/pull/30381
3127 [1.7p]: https://github.com/rust-lang/rust/pull/30681
3128 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
3129 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
3130 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
3131 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
3132 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
3133 [1.7v]: https://github.com/rust-lang/rust/pull/29973
3134 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3135 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3136 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
3137 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
3138 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
3139 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
3140 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
3141 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
3142 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
3143 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
3144 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
3145 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
3146 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
3147 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
3148 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
3149 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
3150 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
3151 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
3152 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
3153 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
3154 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
3155 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
3156 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
3157 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
3158 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
3159 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
3160 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
3161 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
3162 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
3163 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
3164 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
3165 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
3166 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
3167 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
3168 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
3169 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
3170 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
3171 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
3172 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
3173 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
3174 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
3175 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
3176 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
3177 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
3178 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
3179 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
3180 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
3181 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3182 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
3183 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3184 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
3185 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
3186 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
3187 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
3188 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
3189 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
3190 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
3191 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
3192 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
3193 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
3196 Version 1.6.0 (2016-01-21)
3197 ==========================
3202 * The `#![no_std]` attribute causes a crate to not be linked to the
3203 standard library, but only the [core library][1.6co], as described
3204 in [RFC 1184]. The core library defines common types and traits but
3205 has no platform dependencies whatsoever, and is the basis for Rust
3206 software in environments that cannot support a full port of the
3207 standard library, such as operating systems. Most of the core
3208 library is now stable.
3214 [`Read::read_exact`],
3215 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
3216 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
3217 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
3218 [`os::unix::fs::DirBuilderExt`],
3219 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
3220 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
3221 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
3222 [`collections::hash_map::Drain`],
3223 [`collections::hash_map::HashMap::drain`],
3224 [`collections::hash_set::Drain`],
3225 [`collections::hash_set::HashSet::drain`],
3226 [`collections::binary_heap::Drain`],
3227 [`collections::binary_heap::BinaryHeap::drain`],
3228 [`Vec::extend_from_slice`][] (renamed from `push_all`),
3229 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
3230 [`RwLock::into_inner`],
3231 [`Iterator::min_by_key`][] (renamed from `min_by`),
3232 [`Iterator::max_by_key`][] (renamed from `max_by`).
3233 * The [core library][1.6co] is stable, as are most of its APIs.
3234 * [The `assert_eq!` macro supports arguments that don't implement
3235 `Sized`][1.6ae], such as arrays. In this way it behaves more like
3237 * Several timer functions that take duration in milliseconds [are
3238 deprecated in favor of those that take `Duration`][1.6ms]. These
3239 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
3240 `thread::park_timeout_ms`.
3241 * The algorithm by which `Vec` reserves additional elements was
3242 [tweaked to not allocate excessive space][1.6a] while still growing
3244 * `From` conversions are [implemented from integers to floats][1.6f]
3245 in cases where the conversion is lossless. Thus they are not
3246 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
3247 or `f64`. They are also not implemented for `isize` and `usize`
3248 because the implementations would be platform-specific. `From` is
3249 also implemented from `f32` to `f64`.
3250 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
3251 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
3252 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
3253 * [`BinaryHeap` was refactored][1.6bh] for modest performance
3255 * Sorting slices that are already sorted [is 50% faster in some
3261 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
3262 * Cargo build scripts can specify their dependencies by emitting the
3263 [`rerun-if-changed`][1.6rr] key.
3264 * crates.io will reject publication of crates with dependencies that
3265 have a wildcard version constraint. Crates with wildcard
3266 dependencies were seen to cause a variety of problems, as described
3267 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
3269 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
3270 release folder. A variety of artifacts that Cargo failed to clean
3271 are now correctly deleted.
3276 * The `unreachable_code` lint [warns when a function call's argument
3278 * The parser indicates [failures that may be caused by
3279 confusingly-similar Unicode characters][1.6uc]
3280 * Certain macro errors [are reported at definition time][1.6m], not
3286 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
3287 environment variable when locating crates. This was a pre-cargo
3288 feature for integrating with the package manager that was
3289 accidentally never removed.
3290 * [A number of bugs were fixed in the privacy checker][1.6p] that
3291 could cause previously-accepted code to break.
3292 * [Modules and unit/tuple structs may not share the same name][1.6ts].
3293 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
3294 struct pattern syntax (`Foo(..)`) can no longer be used to match
3295 unit structs. This is a warning now, but will become an error in
3296 future releases. Patterns that share the same name as a const are
3298 * A bug was fixed that causes [rustc not to apply default type
3299 parameters][1.6xc] when resolving certain method implementations of
3300 traits defined in other crates.
3302 [1.6a]: https://github.com/rust-lang/rust/pull/29454
3303 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
3304 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
3305 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
3306 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
3307 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
3308 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
3309 [1.6f]: https://github.com/rust-lang/rust/pull/29129
3310 [1.6m]: https://github.com/rust-lang/rust/pull/29828
3311 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
3312 [1.6p]: https://github.com/rust-lang/rust/pull/29726
3313 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
3314 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
3315 [1.6s]: https://github.com/rust-lang/rust/pull/29675
3316 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
3317 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
3318 [1.6us]: https://github.com/rust-lang/rust/pull/29383
3319 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
3320 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
3321 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3322 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
3323 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
3324 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
3325 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
3326 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
3327 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
3328 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
3329 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
3330 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
3331 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
3332 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
3333 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
3334 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
3335 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
3336 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
3337 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
3338 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
3339 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
3340 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
3341 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
3342 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
3343 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
3344 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
3345 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
3346 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
3347 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
3348 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
3351 Version 1.5.0 (2015-12-10)
3352 ==========================
3354 * ~700 changes, numerous bugfixes
3360 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
3361 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
3362 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
3363 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
3364 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
3365 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
3366 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
3367 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
3368 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
3369 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
3370 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
3371 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
3372 [`Path::read_link`], [`Path::symlink_metadata`],
3373 [`Utf8Error::valid_up_to`], [`Vec::resize`],
3374 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
3375 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
3376 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
3377 [`slice::split_first_mut`], [`slice::split_first`],
3378 [`slice::split_last_mut`], [`slice::split_last`],
3379 [`char::from_u32_unchecked`], [`fs::canonicalize`],
3380 [`str::MatchIndices`], [`str::RMatchIndices`],
3381 [`str::match_indices`], [`str::rmatch_indices`],
3382 [`str::slice_mut_unchecked`], [`string::ParseError`].
3383 * Rust applications hosted on crates.io can be installed locally to
3384 `~/.cargo/bin` with the [`cargo install`] command. Among other
3385 things this makes it easier to augment Cargo with new subcommands:
3386 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
3387 invoked as `cargo foo`.
3388 * Crates with wildcard (`*`) dependencies will [emit warnings when
3389 published][1.5w]. In 1.6 it will no longer be possible to publish
3390 crates with wildcard dependencies.
3395 * The rules determining when a particular lifetime must outlive
3396 a particular value (known as '[dropck]') have been [modified
3397 to not rely on parametricity][1.5p].
3398 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
3399 and `Arc`][1.5a]. Because these smart pointer types implement
3400 `Deref`, this causes breakage in cases where the interior type
3401 contains methods of the same name.
3402 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
3403 that they could drop their content. Soundness fix.
3404 * All method invocations are [properly checked][1.5wf1] for
3405 [well-formedness][1.5wf2]. Soundness fix.
3406 * Traits whose supertraits contain `Self` are [not object
3407 safe][1.5o]. Soundness fix.
3408 * Target specifications support a [`no_default_libraries`][1.5nd]
3409 setting that controls whether `-nodefaultlibs` is passed to the
3410 linker, and in turn the `is_like_windows` setting no longer affects
3411 the `-nodefaultlibs` flag.
3412 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
3413 * The `#[inline]` and `#[repr]` attributes [can only appear
3414 in valid locations][1.5at].
3415 * Native libraries linked from the local crate are [passed to
3416 the linker before native libraries from upstream crates][1.5nl].
3417 * Two rarely-used attributes, `#[no_debug]` and
3418 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
3419 * Negation of unsigned integers, which has been a warning for
3420 several releases, [is now behind a feature gate and will
3421 generate errors][1.5nu].
3422 * The parser accidentally accepted visibility modifiers on
3423 enum variants, a bug [which has been fixed][1.5ev].
3424 * [A bug was fixed that allowed `use` statements to import unstable
3430 * When evaluating expressions at compile-time that are not
3431 compile-time constants (const-evaluating expressions in non-const
3432 contexts), incorrect code such as overlong bitshifts and arithmetic
3433 overflow will [generate a warning instead of an error][1.5ce],
3434 delaying the error until runtime. This will allow the
3435 const-evaluator to be expanded in the future backwards-compatibly.
3436 * The `improper_ctypes` lint [no longer warns about using `isize` and
3437 `usize` in FFI][1.5ict].
3442 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
3444 * `Default` is [implemented for mutable slices][1.5d].
3445 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
3446 * There are now `From` conversions [between floating point
3447 types][1.5f] where the conversions are lossless.
3448 * There are now `From` conversions [between integer types][1.5i] where
3449 the conversions are lossless.
3450 * [`fs::Metadata` implements `Clone`][1.5fs].
3451 * The `parse` method [accepts a leading "+" when parsing
3453 * [`AsMut` is implemented for `Vec`][1.5am].
3454 * The `clone_from` implementations for `String` and `BinaryHeap` [have
3455 been optimized][1.5cf] and no longer rely on the default impl.
3456 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
3457 `unsafe extern "C"` function types now [implement `Clone`,
3458 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
3459 `fmt::Debug` for up to 12 arguments][1.5fp].
3460 * [Dropping `Vec`s is much faster in unoptimized builds when the
3461 element types don't implement `Drop`][1.5dv].
3462 * A bug that caused in incorrect behavior when [combining `VecDeque`
3463 with zero-sized types][1.5vdz] was resolved.
3464 * [`PartialOrd` for slices is faster][1.5po].
3469 * [Crate metadata size was reduced by 20%][1.5md].
3470 * [Improvements to code generation reduced the size of libcore by 3.3
3471 MB and rustc's memory usage by 18MB][1.5m].
3472 * [Improvements to deref translation increased performance in
3473 unoptimized builds][1.5dr].
3474 * Various errors in trait resolution [are deduplicated to only be
3475 reported once][1.5te].
3476 * Rust has preliminary [support for rumprun kernels][1.5rr].
3477 * Rust has preliminary [support for NetBSD on amd64][1.5na].
3479 [1.5use]: https://github.com/rust-lang/rust/pull/28364
3480 [1.5po]: https://github.com/rust-lang/rust/pull/28436
3481 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
3482 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
3483 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
3484 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
3485 [1.5md]: https://github.com/rust-lang/rust/pull/28521
3486 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
3487 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
3488 [1.5na]: https://github.com/rust-lang/rust/pull/28543
3489 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
3490 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
3491 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
3492 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
3493 [1.5te]: https://github.com/rust-lang/rust/pull/28645
3494 [1.5at]: https://github.com/rust-lang/rust/pull/28650
3495 [1.5am]: https://github.com/rust-lang/rust/pull/28663
3496 [1.5m]: https://github.com/rust-lang/rust/pull/28778
3497 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
3498 [1.5a]: https://github.com/rust-lang/rust/pull/28811
3499 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
3500 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
3501 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
3502 [1.5i]: https://github.com/rust-lang/rust/pull/28921
3503 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
3504 [1.5f]: https://github.com/rust-lang/rust/pull/29129
3505 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
3506 [1.5s]: https://github.com/rust-lang/rust/pull/29190
3507 [1.5d]: https://github.com/rust-lang/rust/pull/29245
3508 [1.5o]: https://github.com/rust-lang/rust/pull/29259
3509 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
3510 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3511 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
3512 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
3513 [1.5c]: https://github.com/rust-lang/rust/pull/29110
3514 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3515 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
3516 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
3517 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
3518 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
3519 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
3520 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
3521 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
3522 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
3523 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
3524 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
3525 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
3526 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
3527 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
3528 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
3529 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
3530 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
3531 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
3532 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
3533 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
3534 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
3535 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
3536 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
3537 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
3538 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
3539 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
3540 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
3541 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
3542 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
3543 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
3544 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
3545 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
3546 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
3547 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
3548 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
3549 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
3550 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
3551 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
3552 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
3553 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
3554 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
3555 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
3556 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
3557 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
3558 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
3559 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
3560 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
3561 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
3562 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
3563 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
3564 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
3565 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
3566 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
3567 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
3569 Version 1.4.0 (2015-10-29)
3570 ==========================
3572 * ~1200 changes, numerous bugfixes
3577 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
3578 GNU) are now supported and recommended for use.
3583 * [Several changes have been made to fix type soundness and improve
3584 the behavior of associated types][sound]. See [RFC 1214]. Although
3585 we have mostly introduced these changes as warnings this release, to
3586 become errors next release, there are still some scenarios that will
3587 see immediate breakage.
3588 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
3589 line breaks in addition to `\n`][crlf].
3590 * [Loans of `'static` lifetime extend to the end of a function][stat].
3591 * [`str::parse` no longer introduces avoidable rounding error when
3592 parsing floating point numbers. Together with earlier changes to
3593 float formatting/output, "round trips" like f.to_string().parse()
3594 now preserve the value of f exactly. Additionally, leading plus
3595 signs are now accepted][fp3].
3601 * `use` statements that import multiple items [can now rename
3602 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
3603 * [Binops work correctly on fat pointers][binfat].
3604 * `pub extern crate`, which does not behave as expected, [issues a
3605 warning][pec] until a better solution is found.
3610 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
3611 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
3612 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
3613 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
3614 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
3615 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
3616 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
3617 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
3618 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
3619 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
3620 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
3621 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
3622 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
3623 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
3624 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
3625 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
3626 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
3627 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
3629 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
3630 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
3631 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
3632 `f64::from_str_radix`.
3633 * [Reverse-searching strings is faster with the 'two-way'
3635 * [`std::io::copy` allows `?Sized` arguments][cc].
3636 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
3637 [override `count`, `nth` and `last` with an O(1)
3638 implementation][it].
3639 * [`Default` is implemented for arrays up to `[T; 32]`][d].
3640 * [`IntoRawFd` has been added to the Unix-specific prelude,
3641 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
3643 * [`Extend<String>` and `FromIterator<String` are both implemented for
3645 * [`IntoIterator` is implemented for references to `Option` and
3647 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
3648 Copy`][ext] as part of [RFC 839]. This will cause type inference
3649 breakage in rare situations.
3650 * [`BinaryHeap` implements `Debug`][bh2].
3651 * [`Borrow` and `BorrowMut` are implemented for fixed-size
3653 * [`extern fn`s with the "Rust" and "C" ABIs implement common
3654 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
3655 * [String comparison is faster][faststr].
3656 * `&mut T` where `T: std::fmt::Write` [also implements
3657 `std::fmt::Write`][mutw].
3658 * [A stable regression in `VecDeque::push_back` and other
3659 capacity-altering methods that caused panics for zero-sized types
3661 * [Function pointers implement traits for up to 12 parameters][fp2].
3666 * The compiler [no longer uses the 'morestack' feature to prevent
3667 stack overflow][mm]. Instead it uses guard pages and stack
3668 probes (though stack probes are not yet implemented on any platform
3670 * [The compiler matches traits faster when projections are involved][p].
3671 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
3673 * [Cargo now displays useful information about what its doing during
3674 `cargo update`][cu].
3676 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
3677 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
3678 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
3679 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
3680 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
3681 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
3682 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
3683 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
3684 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
3685 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
3686 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
3687 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
3688 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
3689 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
3690 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
3691 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
3692 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
3693 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
3694 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3695 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3696 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3697 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3698 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3699 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3700 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3701 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3702 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
3703 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
3704 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
3705 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
3706 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
3707 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
3708 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
3709 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
3710 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
3711 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
3712 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
3713 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
3714 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
3715 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
3716 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
3717 [bh2]: https://github.com/rust-lang/rust/pull/28156
3718 [binfat]: https://github.com/rust-lang/rust/pull/28270
3719 [bm]: https://github.com/rust-lang/rust/pull/28197
3720 [cc]: https://github.com/rust-lang/rust/pull/27531
3721 [crlf]: https://github.com/rust-lang/rust/pull/28034
3722 [cu]: https://github.com/rust-lang/cargo/pull/1931
3723 [d]: https://github.com/rust-lang/rust/pull/27825
3724 [dep]: https://github.com/rust-lang/rust/pull/28339
3725 [es]: https://github.com/rust-lang/rust/pull/27956
3726 [ext]: https://github.com/rust-lang/rust/pull/28094
3727 [faststr]: https://github.com/rust-lang/rust/pull/28338
3728 [ffi]: https://github.com/rust-lang/rust/pull/28779
3729 [fp]: https://github.com/rust-lang/rust/pull/28268
3730 [fp2]: https://github.com/rust-lang/rust/pull/28560
3731 [fp3]: https://github.com/rust-lang/rust/pull/27307
3732 [i]: https://github.com/rust-lang/rust/pull/27451
3733 [into2]: https://github.com/rust-lang/rust/pull/28039
3734 [it]: https://github.com/rust-lang/rust/pull/27652
3735 [mm]: https://github.com/rust-lang/rust/pull/27338
3736 [mutw]: https://github.com/rust-lang/rust/pull/28368
3737 [sound]: https://github.com/rust-lang/rust/pull/27641
3738 [p]: https://github.com/rust-lang/rust/pull/27866
3739 [pec]: https://github.com/rust-lang/rust/pull/28486
3740 [pr]: https://github.com/rust-lang/rust/pull/27896
3741 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
3742 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3743 [s]: https://github.com/rust-lang/rust/pull/27474
3744 [stab]: https://github.com/rust-lang/rust/pull/28339
3745 [stat]: https://github.com/rust-lang/rust/pull/28321
3746 [vd]: https://github.com/rust-lang/rust/pull/28494
3748 Version 1.3.0 (2015-09-17)
3749 ==============================
3751 * ~900 changes, numerous bugfixes
3756 * The [new object lifetime defaults][nold] have been [turned
3757 on][nold2] after a cycle of warnings about the change. Now types
3758 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
3759 being interpreted as `&'a Box<Trait+'a>` to `&'a
3760 Box<Trait+'static>`.
3761 * [The Rustonomicon][nom] is a new book in the official documentation
3762 that dives into writing unsafe Rust.
3763 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
3764 timekeeping is employed by other std APIs, as well as out-of-tree
3770 * The [new object lifetime defaults][nold] have been [turned
3771 on][nold2] after a cycle of warnings about the change.
3772 * There is a known [regression][lr] in how object lifetime elision is
3773 interpreted, the proper solution for which is undetermined.
3774 * The `#[prelude_import]` attribute, an internal implementation
3775 detail, was accidentally stabilized previously. [It has been put
3776 behind the `prelude_import` feature gate][pi]. This change is
3777 believed to break no existing code.
3778 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
3779 [more sane for dynamically sized types][dst3]. Code that relied on
3780 the previous behavior is thought to be broken.
3781 * The `dropck` rules, which checks that destructors can't access
3782 destroyed values, [have been updated][dropck] to match the
3783 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
3784 cause some previously-compiling code to no longer build.
3789 * The [new object lifetime defaults][nold] have been [turned
3790 on][nold2] after a cycle of warnings about the change.
3791 * Semicolons may [now follow types and paths in
3792 macros](https://github.com/rust-lang/rust/pull/27000).
3793 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
3794 [more sane for dynamically sized types][dst3]. Code that relied on
3795 the previous behavior is not known to exist, and suspected to be
3797 * `'static` variables [may now be recursive][st].
3798 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
3799 implementations correctly.
3800 * The `dropck` rules, which checks that destructors can't access
3801 destroyed values, [have been updated][dropck] to match the
3807 * The [`Duration`] API, [has been stabilized][ds], as well as the
3808 `std::time` module, which presently contains only `Duration`.
3809 * `Box<str>` and `Box<[T]>` both implement `Clone`.
3810 * The owned C string, [`CString`], implements [`Borrow`] and the
3811 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
3812 these allow C strings to be borrowed and cloned in generic code.
3813 * [`CStr`] implements [`Debug`].
3814 * [`AtomicPtr`] implements [`Debug`].
3815 * [`Error`] trait objects [can be downcast to their concrete types][e]
3816 in many common configurations, using the [`is`], [`downcast`],
3817 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
3819 * Searching for substrings now [employs the two-way algorithm][search]
3820 instead of doing a naive search. This gives major speedups to a
3821 number of methods, including [`contains`][sc], [`find`][sf],
3822 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
3823 [`ends_with`][sew] are also faster.
3824 * The performance of `PartialEq` for slices is [much faster][ps].
3825 * The [`Hash`] trait offers the default method, [`hash_slice`], which
3826 is overridden and optimized by the implementations for scalars.
3827 * The [`Hasher`] trait now has a number of specialized `write_*`
3828 methods for primitive types, for efficiency.
3829 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
3830 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
3831 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
3832 of [`std::error::Error::cause`][iec] also delegates to the inner
3834 * [`process::Child`][pc] gained the [`id`] method, which returns a
3835 `u32` representing the platform-specific process identifier.
3836 * The [`connect`] method on slices is deprecated, replaced by the new
3837 [`join`] method (note that both of these are on the *unstable*
3838 [`SliceConcatExt`] trait, but through the magic of the prelude are
3839 available to stable code anyway).
3840 * The [`Div`] operator is implemented for [`Wrapping`] types.
3841 * [`DerefMut` is implemented for `String`][dms].
3842 * Performance of SipHash (the default hasher for `HashMap`) is
3843 [better for long data][sh].
3844 * [`AtomicPtr`] implements [`Send`].
3845 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
3846 are now [specialized to use uninitialized buffers for increased
3848 * Lifetime parameters of foreign functions [are now resolved
3854 * Rust can now, with some coercion, [produce programs that run on
3855 Windows XP][xp], though XP is not considered a supported platform.
3856 * Porting Rust on Windows from the GNU toolchain to MSVC continues
3857 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
3858 recommended for use in 1.3, though should be fully-functional
3859 in the [64-bit 1.4 beta][b14].
3860 * On Fedora-based systems installation will [properly configure the
3861 dynamic linker][fl].
3862 * The compiler gained many new extended error descriptions, which can
3863 be accessed with the `--explain` flag.
3864 * The `dropck` pass, which checks that destructors can't access
3865 destroyed values, [has been rewritten][dropck]. This fixes some
3866 soundness holes, and as such will cause some previously-compiling
3867 code to no longer build.
3868 * `rustc` now uses [LLVM to write archive files where possible][ar].
3869 Eventually this will eliminate the compiler's dependency on the ar
3871 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
3872 supported FreeBSD on x86_64).
3873 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
3874 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
3876 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
3877 will kill the process instead of leaking][nlp].
3879 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
3880 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
3881 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
3882 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
3883 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
3884 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
3885 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
3886 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
3887 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
3888 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
3889 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
3890 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
3891 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
3892 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3893 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
3894 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
3895 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
3896 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
3897 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
3898 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
3899 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
3900 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
3901 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
3902 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
3903 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
3904 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
3905 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
3906 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
3907 [ar]: https://github.com/rust-lang/rust/pull/26926
3908 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
3909 [dms]: https://github.com/rust-lang/rust/pull/26241
3910 [dropck]: https://github.com/rust-lang/rust/pull/27261
3911 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
3912 [ds]: https://github.com/rust-lang/rust/pull/26818
3913 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
3914 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
3915 [dst3]: https://github.com/rust-lang/rust/pull/27351
3916 [e]: https://github.com/rust-lang/rust/pull/24793
3917 [f]: https://github.com/rust-lang/rust/pull/26588
3918 [fb]: https://github.com/rust-lang/rust/pull/26959
3919 [fl]: https://github.com/rust-lang/rust-installer/pull/41
3920 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
3921 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
3922 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
3923 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
3924 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
3925 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
3926 [lic]: https://github.com/rust-lang/rust/pull/26583
3927 [lnu]: https://github.com/rust-lang/rust/pull/27026
3928 [lr]: https://github.com/rust-lang/rust/issues/27248
3929 [lum]: https://github.com/rust-lang/rust/pull/26378
3930 [lur]: https://github.com/rust-lang/rust/pull/26783
3931 [nlp]: https://github.com/rust-lang/rust/pull/27176
3932 [nold2]: https://github.com/rust-lang/rust/pull/27045
3933 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
3934 [nom]: http://doc.rust-lang.org/nightly/nomicon/
3935 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
3936 [pi]: https://github.com/rust-lang/rust/pull/26699
3937 [ps]: https://github.com/rust-lang/rust/pull/26884
3938 [rte]: https://github.com/rust-lang/rust/pull/26950
3939 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
3940 [search]: https://github.com/rust-lang/rust/pull/26327
3941 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
3942 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
3943 [sh]: https://github.com/rust-lang/rust/pull/27280
3944 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
3945 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
3946 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
3947 [st]: https://github.com/rust-lang/rust/pull/26630
3948 [win1]: https://github.com/rust-lang/rust/pull/26569
3949 [win2]: https://github.com/rust-lang/rust/pull/26741
3950 [win3]: https://github.com/rust-lang/rust/pull/26741
3951 [win4]: https://github.com/rust-lang/rust/pull/27210
3952 [xp]: https://github.com/rust-lang/rust/pull/26569
3954 Version 1.2.0 (2015-08-07)
3955 ==========================
3957 * ~1200 changes, numerous bugfixes
3962 * [Dynamically-sized-type coercions][dst] allow smart pointer types
3963 like `Rc` to contain types without a fixed size, arrays and trait
3964 objects, finally enabling use of `Rc<[T]>` and completing the
3965 implementation of DST.
3966 * [Parallel codegen][parcodegen] is now working again, which can
3967 substantially speed up large builds in debug mode; It also gets
3968 another ~33% speedup when bootstrapping on a 4 core machine (using 8
3969 jobs). It's not enabled by default, but will be "in the near
3970 future". It can be activated with the `-C codegen-units=N` flag to
3972 * This is the first release with [experimental support for linking
3973 with the MSVC linker and lib C on Windows (instead of using the GNU
3974 variants via MinGW)][win]. It is yet recommended only for the most
3975 intrepid Rustaceans.
3976 * Benchmark compilations are showing a 30% improvement in
3977 bootstrapping over 1.1.
3982 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
3983 unicode case mapping, which is a previously-planned change in
3984 behavior and considered a bugfix.
3985 * [`mem::align_of`] now specifies [the *minimum alignment* for
3986 T][align], which is usually the alignment programs are interested
3987 in, and the same value reported by clang's
3988 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
3990 * [The `#[packed]` attribute is no longer silently accepted by the
3991 compiler][packed]. This attribute did nothing and code that
3992 mentioned it likely did not work as intended.
3993 * Associated type defaults are [now behind the
3994 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
3995 defaults *did not work*, but could be mentioned syntactically. As
3996 such this breakage has minimal impact.
4001 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
4002 matching against dereferencable values.
4007 * The [`Extend`] trait, which grows a collection from an iterator, is
4008 implemented over iterators of references, for `String`, `Vec`,
4009 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
4010 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
4011 * The [`iter::once`] function returns an iterator that yields a single
4012 element, and [`iter::empty`] returns an iterator that yields no
4014 * The [`matches`] and [`rmatches`] methods on `str` return iterators
4015 over substring matches.
4016 * [`Cell`] and [`RefCell`] both implement `Eq`.
4017 * A number of methods for wrapping arithmetic are added to the
4018 integral types, [`wrapping_div`], [`wrapping_rem`],
4019 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
4020 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
4021 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
4022 type.. It is illegal for the default arithmetic operations in Rust
4023 to overflow; the desire to wrap must be explicit.
4024 * The `{:#?}` formatting specifier [displays the alternate,
4025 pretty-printed][debugfmt] form of the `Debug` formatter. This
4026 feature was actually introduced prior to 1.0 with little
4028 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
4029 for writing data to formatted strings, similar to [`io::Write`].
4030 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
4031 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
4032 are used by code generators to emit implementations of [`Debug`].
4033 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
4034 methods that convert case, following Unicode case mapping.
4035 * It is now easier to handle poisoned locks. The [`PoisonError`]
4036 type, returned by failing lock operations, exposes `into_inner`,
4037 `get_ref`, and `get_mut`, which all give access to the inner lock
4038 guard, and allow the poisoned lock to continue to operate. The
4039 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
4040 poisoned lock without attempting to take the lock.
4041 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
4042 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
4043 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
4044 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
4046 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
4052 * `rustc` employs smarter heuristics for guessing at [typos].
4053 * `rustc` emits more efficient code for [no-op conversions between
4054 unsafe pointers][nop].
4055 * Fat pointers are now [passed in pairs of immediate arguments][fat],
4056 resulting in faster compile times and smaller code.
4058 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
4059 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4060 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
4061 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
4062 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
4063 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
4064 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
4065 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
4066 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
4067 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
4068 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
4069 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
4070 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
4071 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
4072 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
4073 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
4074 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4075 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
4076 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
4077 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
4078 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
4079 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
4080 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
4081 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
4082 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
4083 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4084 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
4085 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
4086 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
4087 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
4088 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
4089 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
4090 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
4091 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4092 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4093 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
4094 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
4095 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
4096 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
4097 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
4098 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
4099 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4100 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
4101 [align]: https://github.com/rust-lang/rust/pull/25646
4102 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
4103 [typos]: https://github.com/rust-lang/rust/pull/26087
4104 [nop]: https://github.com/rust-lang/rust/pull/26336
4105 [fat]: https://github.com/rust-lang/rust/pull/26411
4106 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
4107 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
4108 [packed]: https://github.com/rust-lang/rust/pull/25541
4109 [ad]: https://github.com/rust-lang/rust/pull/27382
4110 [win]: https://github.com/rust-lang/rust/pull/25350
4112 Version 1.1.0 (2015-06-25)
4113 =========================
4115 * ~850 changes, numerous bugfixes
4120 * The [`std::fs` module has been expanded][fs] to expand the set of
4121 functionality exposed:
4122 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
4123 don't incur a syscall on some platforms.
4124 * A `symlink_metadata` function has been added.
4125 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
4126 access to all underlying information.
4127 * The compiler now contains extended explanations of many errors. When an error
4128 with an explanation occurs the compiler suggests using the `--explain` flag
4129 to read the explanation. Error explanations are also [available online][err-index].
4130 * Thanks to multiple [improvements][sk] to [type checking][pre], as
4131 well as other work, the time to bootstrap the compiler decreased by
4137 * The [`str::split_whitespace`] method splits a string on unicode
4138 whitespace boundaries.
4139 * On both Windows and Unix, new extension traits provide conversion of
4140 I/O types to and from the underlying system handles. On Unix, these
4141 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
4142 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
4143 `TcpListener`, and `UpdSocket`. Further implementations for
4144 `std::process` will be stabilized later.
4145 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
4146 Windows, symlinks can be created with
4147 `std::os::windows::symlink_dir` and
4148 `std::os::windows::symlink_file`.
4149 * The `mpsc::Receiver` type can now be converted into an iterator with
4150 `into_iter` on the [`IntoIterator`] trait.
4151 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
4152 implementation of the [`From`] trait.
4153 * The `Debug` implementation for `RangeFull` [creates output that is
4154 more consistent with other implementations][rf].
4155 * [`Debug` is implemented for `File`][file].
4156 * The `Default` implementation for `Arc` [no longer requires `Sync +
4158 * [The `Iterator` methods `count`, `nth`, and `last` have been
4159 overridden for slices to have O(1) performance instead of O(n)][si].
4160 * Incorrect handling of paths on Windows has been improved in both the
4161 compiler and the standard library.
4162 * [`AtomicPtr` gained a `Default` implementation][ap].
4163 * In accordance with Rust's policy on arithmetic overflow `abs` now
4164 [panics on overflow when debug assertions are enabled][abs].
4165 * The [`Cloned`] iterator, which was accidentally left unstable for
4166 1.0 [has been stabilized][c].
4167 * The [`Incoming`] iterator, which iterates over incoming TCP
4168 connections, and which was accidentally unnamable in 1.0, [is now
4169 properly exported][inc].
4170 * [`BinaryHeap`] no longer corrupts itself [when functions called by
4171 `sift_up` or `sift_down` panic][bh].
4172 * The [`split_off`] method of `LinkedList` [no longer corrupts
4173 the list in certain scenarios][ll].
4178 * Type checking performance [has improved notably][sk] with
4179 [multiple improvements][pre].
4180 * The compiler [suggests code changes][ch] for more errors.
4181 * rustc and it's build system have experimental support for [building
4182 toolchains against MUSL][m] instead of glibc on Linux.
4183 * The compiler defines the `target_env` cfg value, which is used for
4184 distinguishing toolchains that are otherwise for the same
4185 platform. Presently this is set to `gnu` for common GNU Linux
4186 targets and for MinGW targets, and `musl` for MUSL Linux targets.
4187 * The [`cargo rustc`][crc] command invokes a build with custom flags
4189 * [Android executables are always position independent][pie].
4190 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
4193 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
4194 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4195 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4196 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
4197 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
4198 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
4199 [rf]: https://github.com/rust-lang/rust/pull/24491
4200 [err-index]: https://doc.rust-lang.org/error-index.html
4201 [sk]: https://github.com/rust-lang/rust/pull/24615
4202 [pre]: https://github.com/rust-lang/rust/pull/25323
4203 [file]: https://github.com/rust-lang/rust/pull/24598
4204 [ch]: https://github.com/rust-lang/rust/pull/24683
4205 [arc]: https://github.com/rust-lang/rust/pull/24695
4206 [si]: https://github.com/rust-lang/rust/pull/24701
4207 [ap]: https://github.com/rust-lang/rust/pull/24834
4208 [m]: https://github.com/rust-lang/rust/pull/24777
4209 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
4210 [crc]: https://github.com/rust-lang/cargo/pull/1568
4211 [pie]: https://github.com/rust-lang/rust/pull/24953
4212 [abs]: https://github.com/rust-lang/rust/pull/25441
4213 [c]: https://github.com/rust-lang/rust/pull/25496
4214 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
4215 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
4216 [inc]: https://github.com/rust-lang/rust/pull/25522
4217 [bh]: https://github.com/rust-lang/rust/pull/25856
4218 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
4219 [ll]: https://github.com/rust-lang/rust/pull/26022
4220 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
4221 [drop]: https://github.com/rust-lang/rust/pull/24935
4223 Version 1.0.0 (2015-05-15)
4224 ========================
4226 * ~1500 changes, numerous bugfixes
4231 * The vast majority of the standard library is now `#[stable]`. It is
4232 no longer possible to use unstable features with a stable build of
4234 * Many popular crates on [crates.io] now work on the stable release
4236 * Arithmetic on basic integer types now [checks for overflow in debug
4242 * Several [restrictions have been added to trait coherence][coh] in
4243 order to make it easier for upstream authors to change traits
4244 without breaking downstream code.
4245 * Digits of binary and octal literals are [lexed more eagerly][lex] to
4246 improve error messages and macro behavior. For example, `0b1234` is
4247 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
4248 * Trait bounds [are always invariant][inv], eliminating the need for
4249 the `PhantomFn` and `MarkerTrait` lang items, which have been
4251 * ["-" is no longer a valid character in crate names][cr], the `extern crate
4252 "foo" as bar` syntax has been replaced with `extern crate foo as
4253 bar`, and Cargo now automatically translates "-" in *package* names
4254 to underscore for the crate name.
4255 * [Lifetime shadowing is an error][lt].
4256 * [`Send` no longer implies `'static`][send-rfc].
4257 * [UFCS now supports trait-less associated paths][moar-ufcs] like
4258 `MyType::default()`.
4259 * Primitive types [now have inherent methods][prim-inherent],
4260 obviating the need for extension traits like `SliceExt`.
4261 * Methods with `Self: Sized` in their `where` clause are [considered
4262 object-safe][self-sized], allowing many extension traits like
4263 `IteratorExt` to be merged into the traits they extended.
4264 * You can now [refer to associated types][assoc-where] whose
4265 corresponding trait bounds appear only in a `where` clause.
4266 * The final bits of [OIBIT landed][oibit-final], meaning that traits
4267 like `Send` and `Sync` are now library-defined.
4268 * A [Reflect trait][reflect] was introduced, which means that
4269 downcasting via the `Any` trait is effectively limited to concrete
4270 types. This helps retain the potentially-important "parametricity"
4271 property: generic code cannot behave differently for different type
4272 arguments except in minor ways.
4273 * The `unsafe_destructor` feature is now deprecated in favor of the
4274 [new `dropck`][dropck]. This change is a major reduction in unsafe
4280 * The `thread_local` module [has been renamed to `std::thread`][th].
4281 * The methods of `IteratorExt` [have been moved to the `Iterator`
4283 * Several traits that implement Rust's conventions for type
4284 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
4285 [centralized in the `std::convert` module][con].
4286 * The `FromError` trait [was removed in favor of `From`][fe].
4287 * The basic sleep function [has moved to
4288 `std::thread::sleep_ms`][slp].
4289 * The `splitn` function now takes an `n` parameter that represents the
4290 number of items yielded by the returned iterator [instead of the
4291 number of 'splits'][spl].
4292 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
4293 * [Derived implementations of `PartialOrd` now order enums according
4294 to their explicitly-assigned discriminants][po].
4295 * [Methods for searching strings are generic over `Pattern`s][pat],
4296 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
4298 * [In method resolution, object methods are resolved before inherent
4300 * [`String::from_str` has been deprecated in favor of the `From` impl,
4301 `String::from`][sf].
4302 * [`io::Error` implements `Sync`][ios].
4303 * [The `words` method on `&str` has been replaced with
4304 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
4306 * The new path and IO modules are complete and `#[stable]`. This
4307 was the major library focus for this cycle.
4308 * The path API was [revised][path-normalize] to normalize `.`,
4309 adjusting the tradeoffs in favor of the most common usage.
4310 * A large number of remaining APIs in `std` were also stabilized
4311 during this cycle; about 75% of the non-deprecated API surface
4313 * The new [string pattern API][string-pattern] landed, which makes
4314 the string slice API much more internally consistent and flexible.
4315 * A new set of [generic conversion traits][conversion] replaced
4316 many existing ad hoc traits.
4317 * Generic numeric traits were [completely removed][num-traits]. This
4318 was made possible thanks to inherent methods for primitive types,
4319 and the removal gives maximal flexibility for designing a numeric
4320 hierarchy in the future.
4321 * The `Fn` traits are now related via [inheritance][fn-inherit]
4322 and provide ergonomic [blanket implementations][fn-blanket].
4323 * The `Index` and `IndexMut` traits were changed to
4324 [take the index by value][index-value], enabling code like
4325 `hash_map["string"]` to work.
4326 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
4327 `Copy` data is known to be `Clone` as well.
4332 * Many errors now have extended explanations that can be accessed with
4333 the `--explain` flag to `rustc`.
4334 * Many new examples have been added to the standard library
4336 * rustdoc has received a number of improvements focused on completion
4338 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
4339 * Much headway was made on ecosystem-wide CI, making it possible
4340 to [compare builds for breakage][ci-compare].
4343 [crates.io]: http://crates.io
4344 [clo]: https://github.com/rust-lang/rust/pull/24034
4345 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
4346 [con]: https://github.com/rust-lang/rust/pull/23875
4347 [cr]: https://github.com/rust-lang/rust/pull/23419
4348 [fe]: https://github.com/rust-lang/rust/pull/23879
4349 [ie]: https://github.com/rust-lang/rust/pull/23300
4350 [inv]: https://github.com/rust-lang/rust/pull/23938
4351 [ios]: https://github.com/rust-lang/rust/pull/24133
4352 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
4353 [lt]: https://github.com/rust-lang/rust/pull/24057
4354 [meth]: https://github.com/rust-lang/rust/pull/24056
4355 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
4356 [po]: https://github.com/rust-lang/rust/pull/24270
4357 [sf]: https://github.com/rust-lang/rust/pull/24517
4358 [slp]: https://github.com/rust-lang/rust/pull/23949
4359 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
4360 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
4361 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
4362 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
4363 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
4364 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
4365 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
4366 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
4367 [self-sized]: https://github.com/rust-lang/rust/pull/22301
4368 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
4369 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
4370 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
4371 [reflect]: https://github.com/rust-lang/rust/pull/23712
4372 [conversion]: https://github.com/rust-lang/rfcs/pull/529
4373 [num-traits]: https://github.com/rust-lang/rust/pull/23549
4374 [index-value]: https://github.com/rust-lang/rust/pull/23601
4375 [dropck]: https://github.com/rust-lang/rfcs/pull/769
4376 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
4377 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
4378 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
4379 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
4380 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
4383 Version 1.0.0-alpha.2 (2015-02-20)
4384 =====================================
4386 * ~1300 changes, numerous bugfixes
4390 * The various I/O modules were [overhauled][io-rfc] to reduce
4391 unnecessary abstractions and provide better interoperation with
4392 the underlying platform. The old `io` module remains temporarily
4394 * The standard library now [participates in feature gating][feat],
4395 so use of unstable libraries now requires a `#![feature(...)]`
4396 attribute. The impact of this change is [described on the
4397 forum][feat-forum]. [RFC][feat-rfc].
4401 * `for` loops [now operate on the `IntoIterator` trait][into],
4402 which eliminates the need to call `.iter()`, etc. to iterate
4403 over collections. There are some new subtleties to remember
4404 though regarding what sort of iterators various types yield, in
4405 particular that `for foo in bar { }` yields values from a move
4406 iterator, destroying the original collection. [RFC][into-rfc].
4407 * Objects now have [default lifetime bounds][obj], so you don't
4408 have to write `Box<Trait+'static>` when you don't care about
4409 storing references. [RFC][obj-rfc].
4410 * In types that implement `Drop`, [lifetimes must outlive the
4411 value][drop]. This will soon make it possible to safely
4412 implement `Drop` for types where `#[unsafe_destructor]` is now
4413 required. Read the [gorgeous RFC][drop-rfc] for details.
4414 * The fully qualified <T as Trait>::X syntax lets you set the Self
4415 type for a trait method or associated type. [RFC][ufcs-rfc].
4416 * References to types that implement `Deref<U>` now [automatically
4417 coerce to references][deref] to the dereferenced type `U`,
4418 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
4419 should eliminate many unsightly uses of `&*`, as when converting
4420 from references to vectors into references to
4421 slices. [RFC][deref-rfc].
4422 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
4423 `|:|`) is obsolete and closure kind is inferred from context.
4424 * [`Self` is a keyword][Self].
4428 * The `Show` and `String` formatting traits [have been
4429 renamed][fmt] to `Debug` and `Display` to more clearly reflect
4430 their related purposes. Automatically getting a string
4431 conversion to use with `format!("{:?}", something_to_debug)` is
4432 now written `#[derive(Debug)]`.
4433 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
4434 OsStr}`, provide strings in platform-specific encodings for easier
4435 interop with system APIs. [RFC][osstr-rfc].
4436 * The `boxed::into_raw` and `Box::from_raw` functions [convert
4437 between `Box<T>` and `*mut T`][boxraw], a common pattern for
4438 creating raw pointers.
4442 * Certain long error messages of the form 'expected foo found bar'
4443 are now [split neatly across multiple
4444 lines][multiline]. Examples in the PR.
4445 * On Unix Rust can be [uninstalled][un] by running
4446 `/usr/local/lib/rustlib/uninstall.sh`.
4447 * The `#[rustc_on_unimplemented]` attribute, requiring the
4448 'on_unimplemented' feature, lets rustc [display custom error
4449 messages when a trait is expected to be implemented for a type
4454 * Rust is tested against a [LALR grammar][lalr], which parses
4455 almost all the Rust files that rustc does.
4457 [boxraw]: https://github.com/rust-lang/rust/pull/21318
4458 [close]: https://github.com/rust-lang/rust/pull/21843
4459 [deref]: https://github.com/rust-lang/rust/pull/21351
4460 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
4461 [drop]: https://github.com/rust-lang/rust/pull/21972
4462 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4463 [feat]: https://github.com/rust-lang/rust/pull/21248
4464 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
4465 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
4466 [fmt]: https://github.com/rust-lang/rust/pull/21457
4467 [into]: https://github.com/rust-lang/rust/pull/20790
4468 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
4469 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4470 [lalr]: https://github.com/rust-lang/rust/pull/21452
4471 [multiline]: https://github.com/rust-lang/rust/pull/19870
4472 [obj]: https://github.com/rust-lang/rust/pull/22230
4473 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
4474 [onun]: https://github.com/rust-lang/rust/pull/20889
4475 [osstr]: https://github.com/rust-lang/rust/pull/21488
4476 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4477 [Self]: https://github.com/rust-lang/rust/pull/22158
4478 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
4479 [un]: https://github.com/rust-lang/rust/pull/22256
4482 Version 1.0.0-alpha (2015-01-09)
4483 ==================================
4485 * ~2400 changes, numerous bugfixes
4489 * The language itself is considered feature complete for 1.0,
4490 though there will be many usability improvements and bugfixes
4491 before the final release.
4492 * Nearly 50% of the public API surface of the standard library has
4493 been declared 'stable'. Those interfaces are unlikely to change
4495 * The long-running debate over integer types has been
4496 [settled][ints]: Rust will ship with types named `isize` and
4497 `usize`, rather than `int` and `uint`, for pointer-sized
4498 integers. Guidelines will be rolled out during the alpha cycle.
4499 * Most crates that are not `std` have been moved out of the Rust
4500 distribution into the Cargo ecosystem so they can evolve
4501 separately and don't need to be stabilized as quickly, including
4502 'time', 'getopts', 'num', 'regex', and 'term'.
4503 * Documentation continues to be expanded with more API coverage, more
4504 examples, and more in-depth explanations. The guides have been
4505 consolidated into [The Rust Programming Language][trpl].
4506 * "[Rust By Example][rbe]" is now maintained by the Rust team.
4507 * All official Rust binary installers now come with [Cargo], the
4508 Rust package manager.
4512 * Closures have been [completely redesigned][unboxed] to be
4513 implemented in terms of traits, can now be used as generic type
4514 bounds and thus monomorphized and inlined, or via an opaque
4515 pointer (boxed) as in the old system. The new system is often
4516 referred to as 'unboxed' closures.
4517 * Traits now support [associated types][assoc], allowing families
4518 of related types to be defined together and used generically in
4520 * Enum variants are [namespaced by their type names][enum].
4521 * [`where` clauses][where] provide a more versatile and attractive
4522 syntax for specifying generic bounds, though the previous syntax
4524 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
4526 * Rust [no longer has a runtime][rt] of any description, and only
4527 supports OS threads, not green threads.
4528 * At long last, Rust has been overhauled for 'dynamically-sized
4529 types' ([DST]), which integrates 'fat pointers' (object types,
4530 arrays, and `str`) more deeply into the type system, making it
4532 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
4533 `..j` that produce range types and which, when combined with the
4534 `Index` operator and multidispatch, leads to a convenient slice
4536 * The new range syntax revealed an ambiguity in the fixed-length
4537 array syntax, so now fixed length arrays [are written `[T;
4539 * The `Copy` trait is no longer implemented automatically. Unsafe
4540 pointers no longer implement `Sync` and `Send` so types
4541 containing them don't automatically either. `Sync` and `Send`
4542 are now 'unsafe traits' so one can "forcibly" implement them via
4543 `unsafe impl` if a type confirms to the requirements for them
4544 even though the internals do not (e.g. structs containing unsafe
4545 pointers like `Arc`). These changes are intended to prevent some
4546 footguns and are collectively known as [opt-in built-in
4547 traits][oibit] (though `Sync` and `Send` will soon become pure
4548 library types unknown to the compiler).
4549 * Operator traits now take their operands [by value][ops], and
4550 comparison traits can use multidispatch to compare one type
4551 against multiple other types, allowing e.g. `String` to be
4552 compared with `&str`.
4553 * `if let` and `while let` are no longer feature-gated.
4554 * Rust has adopted a more [uniform syntax for escaping unicode
4555 characters][unicode].
4556 * `macro_rules!` [has been declared stable][mac]. Though it is a
4557 flawed system it is sufficiently popular that it must be usable
4558 for 1.0. Effort has gone into [future-proofing][mac-future] it
4559 in ways that will allow other macro systems to be developed in
4560 parallel, and won't otherwise impact the evolution of the
4562 * The prelude has been [pared back significantly][prelude] such
4563 that it is the minimum necessary to support the most pervasive
4564 code patterns, and through [generalized where clauses][where]
4565 many of the prelude extension traits have been consolidated.
4566 * Rust's rudimentary reflection [has been removed][refl], as it
4567 incurred too much code generation for little benefit.
4568 * [Struct variants][structvars] are no longer feature-gated.
4569 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
4570 known as 'higher-ranked trait bounds', this crucially allows
4571 unboxed closures to work.
4572 * Macros invocations surrounded by parens or square brackets and
4573 not terminated by a semicolon are [parsed as
4574 expressions][macros], which makes expressions like `vec![1i32,
4575 2, 3].len()` work as expected.
4576 * Trait objects now implement their traits automatically, and
4577 traits that can be coerced to objects now must be [object
4579 * Automatically deriving traits is now done with `#[derive(...)]`
4580 not `#[deriving(...)]` for [consistency with other naming
4581 conventions][derive].
4582 * Importing the containing module or enum at the same time as
4583 items or variants they contain is [now done with `self` instead
4584 of `mod`][self], as in use `foo::{self, bar}`
4585 * Glob imports are no longer feature-gated.
4586 * The `box` operator and `box` patterns have been feature-gated
4587 pending a redesign. For now unique boxes should be allocated
4588 like other containers, with `Box::new`.
4592 * A [series][coll1] of [efforts][coll2] to establish
4593 [conventions][coll3] for collections types has resulted in API
4594 improvements throughout the standard library.
4595 * New [APIs for error handling][err] provide ergonomic interop
4596 between error types, and [new conventions][err-conv] describe
4597 more clearly the recommended error handling strategies in Rust.
4598 * The `fail!` macro has been renamed to [`panic!`][panic] so that
4599 it is easier to discuss failure in the context of error handling
4600 without making clarifications as to whether you are referring to
4601 the 'fail' macro or failure more generally.
4602 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
4603 syscall when available.
4604 * The 'serialize' crate has been renamed 'rustc-serialize' and
4605 moved out of the distribution to Cargo. Although it is widely
4606 used now, it is expected to be superseded in the near future.
4607 * The `Show` formatter, typically implemented with
4608 `#[derive(Show)]` is [now requested with the `{:?}`
4609 specifier][show] and is intended for use by all types, for uses
4610 such as `println!` debugging. The new `String` formatter must be
4611 implemented by hand, uses the `{}` specifier, and is intended
4612 for full-fidelity conversions of things that can logically be
4613 represented as strings.
4617 * [Flexible target specification][flex] allows rustc's code
4618 generation to be configured to support otherwise-unsupported
4620 * Rust comes with rust-gdb and rust-lldb scripts that launch their
4621 respective debuggers with Rust-appropriate pretty-printing.
4622 * The Windows installation of Rust is distributed with the
4623 MinGW components currently required to link binaries on that
4628 * Nullable enum optimizations have been extended to more types so
4629 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
4630 space than the inner types themselves.
4631 * Work has begun on supporting AArch64.
4633 [Cargo]: https://crates.io
4634 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
4635 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
4636 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
4637 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
4638 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
4639 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
4640 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
4641 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
4642 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
4643 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
4644 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
4645 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
4646 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
4647 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
4648 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
4649 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
4650 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
4651 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
4652 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
4653 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
4654 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
4655 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
4656 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
4657 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
4658 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
4659 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
4660 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
4661 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
4662 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
4663 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
4664 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
4665 [trpl]: https://doc.rust-lang.org/book/index.html
4666 [rbe]: http://rustbyexample.com/
4669 Version 0.12.0 (2014-10-09)
4670 =============================
4672 * ~1900 changes, numerous bugfixes
4676 * The introductory documentation (now called The Rust Guide) has
4677 been completely rewritten, as have a number of supplementary
4679 * Rust's package manager, Cargo, continues to improve and is
4680 sometimes considered to be quite awesome.
4681 * Many API's in `std` have been reviewed and updated for
4682 consistency with the in-development Rust coding
4683 guidelines. The standard library documentation tracks
4684 stabilization progress.
4685 * Minor libraries have been moved out-of-tree to the rust-lang org
4686 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
4687 be installed with Cargo.
4688 * Lifetime elision allows lifetime annotations to be left off of
4689 function declarations in many common scenarios.
4690 * Rust now works on 64-bit Windows.
4693 * Indexing can be overloaded with the `Index` and `IndexMut`
4695 * The `if let` construct takes a branch only if the `let` pattern
4696 matches, currently behind the 'if_let' feature gate.
4697 * 'where clauses', a more flexible syntax for specifying trait
4698 bounds that is more aesthetic, have been added for traits and
4699 free functions. Where clauses will in the future make it
4700 possible to constrain associated types, which would be
4701 impossible with the existing syntax.
4702 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
4703 the 'slicing_syntax' feature gate, and can be overloaded with
4704 the `Slice` or `SliceMut` traits.
4705 * The syntax for matching of sub-slices has been changed to use a
4706 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
4707 consistency with other uses of `..` and to future-proof
4708 potential additional uses of the syntax.
4709 * The syntax for matching inclusive ranges in patterns has changed
4710 from `0..3` to `0...4` to be consistent with the exclusive range
4712 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
4713 c]`) has been put behind the 'advanced_slice_patterns' feature
4714 gate and may be removed in the future.
4715 * Components of tuples and tuple structs can be extracted using
4716 the `value.0` syntax, currently behind the `tuple_indexing`
4718 * The `#[crate_id]` attribute is no longer supported; versioning
4719 is handled by the package manager.
4720 * Renaming crate imports are now written `extern crate foo as bar`
4721 instead of `extern crate bar = foo`.
4722 * Renaming use statements are now written `use foo as bar` instead
4724 * `let` and `match` bindings and argument names in macros are now
4726 * The new, more efficient, closure types ('unboxed closures') have
4727 been added under a feature gate, 'unboxed_closures'. These will
4728 soon replace the existing closure types, once higher-ranked
4729 trait lifetimes are added to the language.
4730 * `move` has been added as a keyword, for indicating closures
4731 that capture by value.
4732 * Mutation and assignment is no longer allowed in pattern guards.
4733 * Generic structs and enums can now have trait bounds.
4734 * The `Share` trait is now called `Sync` to free up the term
4735 'shared' to refer to 'shared reference' (the default reference
4737 * Dynamically-sized types have been mostly implemented,
4738 unifying the behavior of fat-pointer types with the rest of the
4740 * As part of dynamically-sized types, the `Sized` trait has been
4741 introduced, which qualifying types implement by default, and
4742 which type parameters expect by default. To specify that a type
4743 parameter does not need to be sized, write `<Sized? T>`. Most
4744 types are `Sized`, notable exceptions being unsized arrays
4745 (`[T]`) and trait types.
4746 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
4747 * Lifetime bounds can now be applied to type parameters and object
4749 * The old, reference counted GC type, `Gc<T>` which was once
4750 denoted by the `@` sigil, has finally been removed. GC will be
4751 revisited in the future.
4754 * Library documentation has been improved for a number of modules.
4755 * Bit-vectors, collections::bitv has been modernized.
4756 * The url crate is deprecated in favor of
4757 http://github.com/servo/rust-url, which can be installed with
4759 * Most I/O stream types can be cloned and subsequently closed from
4761 * A `std::time::Duration` type has been added for use in I/O
4762 methods that rely on timers, as well as in the 'time' crate's
4763 `Timespec` arithmetic.
4764 * The runtime I/O abstraction layer that enabled the green thread
4765 scheduler to do non-thread-blocking I/O has been removed, along
4766 with the libuv-based implementation employed by the green thread
4767 scheduler. This will greatly simplify the future I/O work.
4768 * `collections::btree` has been rewritten to have a more
4769 idiomatic and efficient design.
4772 * rustdoc output now indicates the stability levels of API's.
4773 * The `--crate-name` flag can specify the name of the crate
4774 being compiled, like `#[crate_name]`.
4775 * The `-C metadata` specifies additional metadata to hash into
4776 symbol names, and `-C extra-filename` specifies additional
4777 information to put into the output filename, for use by the
4778 package manager for versioning.
4779 * debug info generation has continued to improve and should be
4780 more reliable under both gdb and lldb.
4781 * rustc has experimental support for compiling in parallel
4782 using the `-C codegen-units` flag.
4783 * rustc no longer encodes rpath information into binaries by
4787 * Stack usage has been optimized with LLVM lifetime annotations.
4788 * Official Rust binaries on Linux are more compatible with older
4789 kernels and distributions, built on CentOS 5.10.
4792 Version 0.11.0 (2014-07-02)
4793 ==========================
4795 * ~1700 changes, numerous bugfixes
4798 * ~[T] has been removed from the language. This type is superseded by
4800 * ~str has been removed from the language. This type is superseded by
4802 * ~T has been removed from the language. This type is superseded by the
4804 * @T has been removed from the language. This type is superseded by the
4805 standard library's std::gc::Gc<T> type.
4806 * Struct fields are now all private by default.
4807 * Vector indices and shift amounts are both required to be a `uint`
4808 instead of any integral type.
4809 * Byte character, byte string, and raw byte string literals are now all
4810 supported by prefixing the normal literal with a `b`.
4811 * Multiple ABIs are no longer allowed in an ABI string
4812 * The syntax for lifetimes on closures/procedures has been tweaked
4813 slightly: `<'a>|A, B|: 'b + K -> T`
4814 * Floating point modulus has been removed from the language; however it
4815 is still provided by a library implementation.
4816 * Private enum variants are now disallowed.
4817 * The `priv` keyword has been removed from the language.
4818 * A closure can no longer be invoked through a &-pointer.
4819 * The `use foo, bar, baz;` syntax has been removed from the language.
4820 * The transmute intrinsic no longer works on type parameters.
4821 * Statics now allow blocks/items in their definition.
4822 * Trait bounds are separated from objects with + instead of : now.
4823 * Objects can no longer be read while they are mutably borrowed.
4824 * The address of a static is now marked as insignificant unless the
4825 #[inline(never)] attribute is placed it.
4826 * The #[unsafe_destructor] attribute is now behind a feature gate.
4827 * Struct literals are no longer allowed in ambiguous positions such as
4828 if, while, match, and for..in.
4829 * Declaration of lang items and intrinsics are now feature-gated by
4831 * Integral literals no longer default to `int`, and floating point
4832 literals no longer default to `f64`. Literals must be suffixed with an
4833 appropriate type if inference cannot determine the type of the
4835 * The Box<T> type is no longer implicitly borrowed to &mut T.
4836 * Procedures are now required to not capture borrowed references.
4839 * The standard library is now a "facade" over a number of underlying
4840 libraries. This means that development on the standard library should
4841 be speedier due to smaller crates, as well as a clearer line between
4843 * A new library, libcore, lives under the standard library's facade
4844 which is Rust's "0-assumption" library, suitable for embedded and
4845 kernel development for example.
4846 * A regex crate has been added to the standard distribution. This crate
4847 includes statically compiled regular expressions.
4848 * The unwrap/unwrap_err methods on Result require a Show bound for
4849 better error messages.
4850 * The return types of the std::comm primitives have been centralized
4851 around the Result type.
4852 * A number of I/O primitives have gained the ability to time out their
4854 * A number of I/O primitives have gained the ability to close their
4855 reading/writing halves to cancel pending operations.
4856 * Reverse iterator methods have been removed in favor of `rev()` on
4857 their forward-iteration counterparts.
4858 * A bitflags! macro has been added to enable easy interop with C and
4859 management of bit flags.
4860 * A debug_assert! macro is now provided which is disabled when
4861 `--cfg ndebug` is passed to the compiler.
4862 * A graphviz crate has been added for creating .dot files.
4863 * The std::cast module has been migrated into std::mem.
4864 * The std::local_data api has been migrated from freestanding functions
4865 to being based on methods.
4866 * The Pod trait has been renamed to Copy.
4867 * jemalloc has been added as the default allocator for types.
4868 * The API for allocating memory has been changed to use proper alignment
4869 and sized deallocation
4870 * Connecting a TcpStream or binding a TcpListener is now based on a
4871 string address and a u16 port. This allows connecting to a hostname as
4873 * The Reader trait now contains a core method, read_at_least(), which
4874 correctly handles many repeated 0-length reads.
4875 * The process-spawning API is now centered around a builder-style
4877 * The :? printing qualifier has been moved from the standard library to
4878 an external libdebug crate.
4879 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
4880 have been renamed to Eq/Ord.
4881 * The select/plural methods have been removed from format!. The escapes
4882 for { and } have also changed from \{ and \} to {{ and }},
4884 * The TaskBuilder API has been re-worked to be a true builder, and
4885 extension traits for spawning native/green tasks have been added.
4888 * All breaking changes to the language or libraries now have their
4889 commit message annotated with `[breaking-change]` to allow for easy
4890 discovery of breaking changes.
4891 * The compiler will now try to suggest how to annotate lifetimes if a
4892 lifetime-related error occurs.
4893 * Debug info continues to be improved greatly with general bug fixes and
4894 better support for situations like link time optimization (LTO).
4895 * Usage of syntax extensions when cross-compiling has been fixed.
4896 * Functionality equivalent to GCC & Clang's -ffunction-sections,
4897 -fdata-sections and --gc-sections has been enabled by default
4898 * The compiler is now stricter about where it will load module files
4899 from when a module is declared via `mod foo;`.
4900 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
4901 Syntax extensions are now discovered via a "plugin registrar" type
4902 which will be extended in the future to other various plugins.
4903 * Lints have been restructured to allow for dynamically loadable lints.
4904 * A number of rustdoc improvements:
4905 * The HTML output has been visually redesigned.
4906 * Markdown is now powered by hoedown instead of sundown.
4907 * Searching heuristics have been greatly improved.
4908 * The search index has been reduced in size by a great amount.
4909 * Cross-crate documentation via `pub use` has been greatly improved.
4910 * Primitive types are now hyperlinked and documented.
4911 * Documentation has been moved from static.rust-lang.org/doc to
4913 * A new sandbox, play.rust-lang.org, is available for running and
4914 sharing rust code examples on-line.
4915 * Unused attributes are now more robustly warned about.
4916 * The dead_code lint now warns about unused struct fields.
4917 * Cross-compiling to iOS is now supported.
4918 * Cross-compiling to mipsel is now supported.
4919 * Stability attributes are now inherited by default and no longer apply
4920 to intra-crate usage, only inter-crate usage.
4921 * Error message related to non-exhaustive match expressions have been
4925 Version 0.10 (2014-04-03)
4926 =========================
4928 * ~1500 changes, numerous bugfixes
4931 * A new RFC process is now in place for modifying the language.
4932 * Patterns with `@`-pointers have been removed from the language.
4933 * Patterns with unique vectors (`~[T]`) have been removed from the
4935 * Patterns with unique strings (`~str`) have been removed from the
4937 * `@str` has been removed from the language.
4938 * `@[T]` has been removed from the language.
4939 * `@self` has been removed from the language.
4940 * `@Trait` has been removed from the language.
4941 * Headers on `~` allocations which contain `@` boxes inside the type for
4942 reference counting have been removed.
4943 * The semantics around the lifetimes of temporary expressions have changed,
4944 see #3511 and #11585 for more information.
4945 * Cross-crate syntax extensions are now possible, but feature gated. See
4946 #11151 for more information. This includes both `macro_rules!` macros as
4947 well as syntax extensions such as `format!`.
4948 * New lint modes have been added, and older ones have been turned on to be
4950 * Unnecessary parentheses
4953 * Uppercase variables
4954 * Publicly visible private types
4955 * `#[deriving]` with raw pointers
4956 * Unsafe functions can no longer be coerced to closures.
4957 * Various obscure macros such as `log_syntax!` are now behind feature gates.
4958 * The `#[simd]` attribute is now behind a feature gate.
4959 * Visibility is no longer allowed on `extern crate` statements, and
4960 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
4961 * Trailing commas are now allowed in argument lists and tuple patterns.
4962 * The `do` keyword has been removed, it is now a reserved keyword.
4963 * Default type parameters have been implemented, but are feature gated.
4964 * Borrowed variables through captures in closures are now considered soundly.
4965 * `extern mod` is now `extern crate`
4966 * The `Freeze` trait has been removed.
4967 * The `Share` trait has been added for types that can be shared among
4969 * Labels in macros are now hygienic.
4970 * Expression/statement macro invocations can be delimited with `{}` now.
4971 * Treatment of types allowed in `static mut` locations has been tweaked.
4972 * The `*` and `.` operators are now overloadable through the `Deref` and
4974 * `~Trait` and `proc` no longer have `Send` bounds by default.
4975 * Partial type hints are now supported with the `_` type marker.
4976 * An `Unsafe` type was introduced for interior mutability. It is now
4977 considered undefined to transmute from `&T` to `&mut T` without using the
4979 * The #[linkage] attribute was implemented for extern statics/functions.
4980 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
4981 * `Pod` was renamed to `Copy`.
4984 * The `libextra` library has been removed. It has now been decomposed into
4985 component libraries with smaller and more focused nuggets of
4986 functionality. The full list of libraries can be found on the
4987 documentation index page.
4988 * std: `std::condition` has been removed. All I/O errors are now propagated
4989 through the `Result` type. In order to assist with error handling, a
4990 `try!` macro for unwrapping errors with an early return and a lint for
4991 unused results has been added. See #12039 for more information.
4992 * std: The `vec` module has been renamed to `slice`.
4993 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
4994 This will become the only growable vector in the future.
4995 * std: `std::io` now has more public-reexports. Types such as `BufferedReader`
4996 are now found at `std::io::BufferedReader` instead of
4997 `std::io::buffered::BufferedReader`.
4998 * std: `print` and `println` are no longer in the prelude, the `print!` and
4999 `println!` macros are intended to be used instead.
5000 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
5001 attempts to statically prevent cycles.
5002 * std: The standard distribution is adopting the policy of pushing failure
5003 to the user rather than failing in libraries. Many functions (such as
5004 `slice::last()`) now return `Option<T>` instead of `T` + failing.
5005 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
5006 deriving mode: `#[deriving(Show)]`.
5007 * std: `ToStr` is now implemented for all types implementing `Show`.
5008 * std: The formatting trait methods now take `&self` instead of `&T`
5009 * std: The `invert()` method on iterators has been renamed to `rev()`
5010 * std: `std::num` has seen a reduction in the genericity of its traits,
5011 consolidating functionality into a few core traits.
5012 * std: Backtraces are now printed on task failure if the environment
5013 variable `RUST_BACKTRACE` is present.
5014 * std: Naming conventions for iterators have been standardized. More details
5015 can be found on the wiki's style guide.
5016 * std: `eof()` has been removed from the `Reader` trait. Specific types may
5017 still implement the function.
5018 * std: Networking types are now cloneable to allow simultaneous reads/writes.
5019 * std: `assert_approx_eq!` has been removed
5020 * std: The `e` and `E` formatting specifiers for floats have been added to
5021 print them in exponential notation.
5022 * std: The `Times` trait has been removed
5023 * std: Indications of variance and opting out of builtin bounds is done
5024 through marker types in `std::kinds::marker` now
5025 * std: `hash` has been rewritten, `IterBytes` has been removed, and
5026 `#[deriving(Hash)]` is now possible.
5027 * std: `SharedChan` has been removed, `Sender` is now cloneable.
5028 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
5029 * std: `Chan::new` is now `channel()`.
5030 * std: A new synchronous channel type has been implemented.
5031 * std: A `select!` macro is now provided for selecting over `Receiver`s.
5032 * std: `hashmap` and `trie` have been moved to `libcollections`
5033 * std: `run` has been rolled into `io::process`
5034 * std: `assert_eq!` now uses `{}` instead of `{:?}`
5035 * std: The equality and comparison traits have seen some reorganization.
5036 * std: `rand` has moved to `librand`.
5037 * std: `to_{lower,upper}case` has been implemented for `char`.
5038 * std: Logging has been moved to `liblog`.
5039 * collections: `HashMap` has been rewritten for higher performance and less
5041 * native: The default runtime is now `libnative`. If `libgreen` is desired,
5042 it can be booted manually. The runtime guide has more information and
5044 * native: All I/O functionality except signals has been implemented.
5045 * green: Task spawning with `libgreen` has been optimized with stack caching
5046 and various trimming of code.
5047 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
5048 * sync: The `extra::sync` module has been updated to modern rust (and moved
5049 to the `sync` library), tweaking and improving various interfaces while
5050 dropping redundant functionality.
5051 * sync: A new `Barrier` type has been added to the `sync` library.
5052 * sync: An efficient mutex for native and green tasks has been implemented.
5053 * serialize: The `base64` module has seen some improvement. It treats
5054 newlines better, has non-string error values, and has seen general
5056 * fourcc: A `fourcc!` macro was introduced
5057 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
5058 hexadecimal literal.
5061 * `rustpkg` has been deprecated and removed from the main repository. Its
5062 replacement, `cargo`, is under development.
5063 * Nightly builds of rust are now available
5064 * The memory usage of rustc has been improved many times throughout this
5066 * The build process supports disabling rpath support for the rustc binary
5068 * Code generation has improved in some cases, giving more information to the
5069 LLVM optimization passes to enable more extensive optimizations.
5070 * Debuginfo compatibility with lldb on OSX has been restored.
5071 * The master branch is now gated on an android bot, making building for
5072 android much more reliable.
5073 * Output flags have been centralized into one `--emit` flag.
5074 * Crate type flags have been centralized into one `--crate-type` flag.
5075 * Codegen flags have been consolidated behind a `-C` flag.
5076 * Linking against outdated crates now has improved error messages.
5077 * Error messages with lifetimes will often suggest how to annotate the
5078 function to fix the error.
5079 * Many more types are documented in the standard library, and new guides
5081 * Many `rustdoc` improvements:
5082 * code blocks are syntax highlighted.
5083 * render standalone markdown files.
5084 * the --test flag tests all code blocks by default.
5085 * exported macros are displayed.
5086 * reexported types have their documentation inlined at the location of the
5088 * search works across crates that have been rendered to the same output
5092 Version 0.9 (2014-01-09)
5093 ==========================
5095 * ~1800 changes, numerous bugfixes
5098 * The `float` type has been removed. Use `f32` or `f64` instead.
5099 * A new facility for enabling experimental features (feature gating) has
5100 been added, using the crate-level `#[feature(foo)]` attribute.
5101 * Managed boxes (@) are now behind a feature gate
5102 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
5103 standard library's `Gc` or `Rc` types instead.
5104 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
5105 * Jumping back to the top of a loop is now done with `continue` instead of
5107 * Strings can no longer be mutated through index assignment.
5108 * Raw strings can be created via the basic `r"foo"` syntax or with matched
5109 hash delimiters, as in `r###"foo"###`.
5110 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
5112 * The `&fn` type is now written `|args| -> ret` to match the literal form.
5113 * `@fn`s have been removed.
5114 * `do` only works with procs in order to make it obvious what the cost
5116 * Single-element tuple-like structs can no longer be dereferenced to
5117 obtain the inner value. A more comprehensive solution for overloading
5118 the dereference operator will be provided in the future.
5119 * The `#[link(...)]` attribute has been replaced with
5120 `#[crate_id = "name#vers"]`.
5121 * Empty `impl`s must be terminated with empty braces and may not be
5122 terminated with a semicolon.
5123 * Keywords are no longer allowed as lifetime names; the `self` lifetime
5124 no longer has any special meaning.
5125 * The old `fmt!` string formatting macro has been removed.
5126 * `printf!` and `printfln!` (old-style formatting) removed in favor of
5127 `print!` and `println!`.
5128 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
5129 * The `extern mod foo (name = "bar")` syntax has been removed. Use
5130 `extern mod foo = "bar"` instead.
5131 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
5132 * Macros can have attributes.
5133 * Macros can expand to items with attributes.
5134 * Macros can expand to multiple items.
5135 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
5136 * Comments may be nested.
5137 * Values automatically coerce to trait objects they implement, without
5139 * Enum discriminants are no longer an entire word but as small as needed to
5140 contain all the variants. The `repr` attribute can be used to override
5141 the discriminant size, as in `#[repr(int)]` for integer-sized, and
5142 `#[repr(C)]` to match C enums.
5143 * Non-string literals are not allowed in attributes (they never worked).
5144 * The FFI now supports variadic functions.
5145 * Octal numeric literals, as in `0o7777`.
5146 * The `concat!` syntax extension performs compile-time string concatenation.
5147 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
5148 removed as Rust no longer uses segmented stacks.
5149 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
5150 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
5151 not `*`; ignoring remaining fields of a struct is also done with `..`,
5152 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
5153 * `rustc` supports the "win64" calling convention via `extern "win64"`.
5154 * `rustc` supports the "system" calling convention, which defaults to the
5155 preferred convention for the target platform, "stdcall" on 32-bit Windows,
5157 * The `type_overflow` lint (default: warn) checks literals for overflow.
5158 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
5159 * The `attribute_usage` lint (default: warn) warns about unknown
5161 * The `unknown_features` lint (default: warn) warns about unknown
5163 * The `dead_code` lint (default: warn) checks for dead code.
5164 * Rust libraries can be linked statically to one another
5165 * `#[link_args]` is behind the `link_args` feature gate.
5166 * Native libraries are now linked with `#[link(name = "foo")]`
5167 * Native libraries can be statically linked to a rust crate
5168 (`#[link(name = "foo", kind = "static")]`).
5169 * Native OS X frameworks are now officially supported
5170 (`#[link(name = "foo", kind = "framework")]`).
5171 * The `#[thread_local]` attribute creates thread-local (not task-local)
5172 variables. Currently behind the `thread_local` feature gate.
5173 * The `return` keyword may be used in closures.
5174 * Types that can be copied via a memcpy implement the `Pod` kind.
5175 * The `cfg` attribute can now be used on struct fields and enum variants.
5178 * std: The `option` and `result` API's have been overhauled to make them
5179 simpler, more consistent, and more composable.
5180 * std: The entire `std::io` module has been replaced with one that is
5181 more comprehensive and that properly interfaces with the underlying
5182 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
5184 * std: `io::util` contains a number of useful implementations of
5185 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
5186 `ZeroReader`, `TeeReader`.
5187 * std: The reference counted pointer type `extra::rc` moved into std.
5188 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
5189 just a wrapper around it).
5190 * std: The `Either` type has been removed.
5191 * std: `fmt::Default` can be implemented for any type to provide default
5192 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
5193 * std: The `rand` API continues to be tweaked.
5194 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
5195 on failure in gdb, is now named `rust_fail`.
5196 * std: The `each_key` and `each_value` methods on `HashMap` have been
5197 replaced by the `keys` and `values` iterators.
5198 * std: Functions dealing with type size and alignment have moved from the
5199 `sys` module to the `mem` module.
5200 * std: The `path` module was written and API changed.
5201 * std: `str::from_utf8` has been changed to cast instead of allocate.
5202 * std: `starts_with` and `ends_with` methods added to vectors via the
5203 `ImmutableEqVector` trait, which is in the prelude.
5204 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
5205 if the index is out of bounds.
5206 * std: Task failure no longer propagates between tasks, as the model was
5207 complex, expensive, and incompatible with thread-based tasks.
5208 * std: The `Any` type can be used for dynamic typing.
5209 * std: `~Any` can be passed to the `fail!` macro and retrieved via
5211 * std: Methods that produce iterators generally do not have an `_iter`
5213 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
5214 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
5215 * std: `util::ignore` renamed to `prelude::drop`.
5216 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
5218 * std: `vec::raw` has seen a lot of cleanup and API changes.
5219 * std: The standard library no longer includes any C++ code, and very
5220 minimal C, eliminating the dependency on libstdc++.
5221 * std: Runtime scheduling and I/O functionality has been factored out into
5222 extensible interfaces and is now implemented by two different crates:
5223 libnative, for native threading and I/O; and libgreen, for green threading
5224 and I/O. This paves the way for using the standard library in more limited
5225 embedded environments.
5226 * std: The `comm` module has been rewritten to be much faster, have a
5227 simpler, more consistent API, and to work for both native and green
5229 * std: All libuv dependencies have been moved into the rustuv crate.
5230 * native: New implementations of runtime scheduling on top of OS threads.
5231 * native: New native implementations of TCP, UDP, file I/O, process spawning,
5233 * green: The green thread scheduler and message passing types are almost
5235 * extra: The `flatpipes` module had bitrotted and was removed.
5236 * extra: All crypto functions have been removed and Rust now has a policy of
5237 not reimplementing crypto in the standard library. In the future crypto
5238 will be provided by external crates with bindings to established libraries.
5239 * extra: `c_vec` has been modernized.
5240 * extra: The `sort` module has been removed. Use the `sort` method on
5244 * The `rust` and `rusti` commands have been removed, due to lack of
5246 * `rustdoc` was completely rewritten.
5247 * `rustdoc` can test code examples in documentation.
5248 * `rustpkg` can test packages with the argument, 'test'.
5249 * `rustpkg` supports arbitrary dependencies, including C libraries.
5250 * `rustc`'s support for generating debug info is improved again.
5251 * `rustc` has better error reporting for unbalanced delimiters.
5252 * `rustc`'s JIT support was removed due to bitrot.
5253 * Executables and static libraries can be built with LTO (-Z lto)
5254 * `rustc` adds a `--dep-info` flag for communicating dependencies to
5258 Version 0.8 (2013-09-26)
5259 ============================
5261 * ~2200 changes, numerous bugfixes
5264 * The `for` loop syntax has changed to work with the `Iterator` trait.
5265 * At long last, unwinding works on Windows.
5266 * Default methods are ready for use.
5267 * Many trait inheritance bugs fixed.
5268 * Owned and borrowed trait objects work more reliably.
5269 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
5270 * rustc can omit emission of code for the `debug!` macro if it is passed
5272 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
5273 for foo.rs, then foo/mod.rs, and will generate an error when both are
5275 * Strings no longer contain trailing nulls. The new `std::c_str` module
5276 provides new mechanisms for converting to C strings.
5277 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
5278 * The FFI has been overhauled such that foreign functions are called directly,
5279 instead of through a stack-switching wrapper.
5280 * Calling a foreign function must be done through a Rust function with the
5281 `#[fixed_stack_segment]` attribute.
5282 * The `externfn!` macro can be used to declare both a foreign function and
5283 a `#[fixed_stack_segment]` wrapper at once.
5284 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
5285 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
5286 * `priv` is disallowed everywhere except for struct fields and enum variants.
5287 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
5288 * `ref` bindings in irrefutable patterns work correctly now.
5289 * `char` is now prevented from containing invalid code points.
5290 * Casting to `bool` is no longer allowed.
5291 * `\0` is now accepted as an escape in chars and strings.
5292 * `yield` is a reserved keyword.
5293 * `typeof` is a reserved keyword.
5294 * Crates may be imported by URL with `extern mod foo = "url";`.
5295 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
5296 * Static vectors can be initialized with repeating elements,
5297 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
5298 * Static structs can be initialized with functional record update,
5299 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
5300 * `cfg!` can be used to conditionally execute code based on the crate
5301 configuration, similarly to `#[cfg(...)]`.
5302 * The `unnecessary_qualification` lint detects unneeded module
5303 prefixes (default: allow).
5304 * Arithmetic operations have been implemented on the SIMD types in
5305 `std::unstable::simd`.
5306 * Exchange allocation headers were removed, reducing memory usage.
5307 * `format!` implements a completely new, extensible, and higher-performance
5308 string formatting system. It will replace `fmt!`.
5309 * `print!` and `println!` write formatted strings (using the `format!`
5310 extension) to stdout.
5311 * `write!` and `writeln!` write formatted strings (using the `format!`
5312 extension) to the new Writers in `std::rt::io`.
5313 * The library section in which a function or static is placed may
5314 be specified with `#[link_section = "..."]`.
5315 * The `proto!` syntax extension for defining bounded message protocols
5317 * `macro_rules!` is hygienic for `let` declarations.
5318 * The `#[export_name]` attribute specifies the name of a symbol.
5319 * `unreachable!` can be used to indicate unreachable code, and fails
5323 * std: Transitioned to the new runtime, written in Rust.
5324 * std: Added an experimental I/O library, `rt::io`, based on the new
5326 * std: A new generic `range` function was added to the prelude, replacing
5327 `uint::range` and friends.
5328 * std: `range_rev` no longer exists. Since range is an iterator it can be
5329 reversed with `range(lo, hi).invert()`.
5330 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
5331 renamed to `unwrap_or`.
5332 * std: The `iterator` module was renamed to `iter`.
5333 * std: Integral types now support the `checked_add`, `checked_sub`, and
5334 `checked_mul` operations for detecting overflow.
5335 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
5337 * std: Methods are standardizing on conventions for casting methods:
5338 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
5340 * std: The `CString` type in `c_str` provides new ways to convert to and
5342 * std: `DoubleEndedIterator` can yield elements in two directions.
5343 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
5345 * std: `str::from_bytes` renamed to `str::from_utf8`.
5346 * std: `pop_opt` and `shift_opt` methods added to vectors.
5347 * std: The task-local data interface no longer uses @, and keys are
5348 no longer function pointers.
5349 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
5350 * std: Added `SharedPort` to `comm`.
5351 * std: `Eq` has a default method for `ne`; only `eq` is required
5353 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
5354 is required in implementations.
5355 * std: `is_utf8` performance is improved, impacting many string functions.
5356 * std: `os::MemoryMap` provides cross-platform mmap.
5357 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
5358 are not 'in-bounds' are considered undefined.
5359 * std: Many freestanding functions in `vec` removed in favor of methods.
5360 * std: Many freestanding functions on scalar types removed in favor of
5362 * std: Many options to task builders were removed since they don't make
5363 sense in the new scheduler design.
5364 * std: More containers implement `FromIterator` so can be created by the
5366 * std: More complete atomic types in `unstable::atomics`.
5367 * std: `comm::PortSet` removed.
5368 * std: Mutating methods in the `Set` and `Map` traits have been moved into
5369 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
5370 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
5371 default implementations.
5372 * std: Various `from_str` functions were removed in favor of a generic
5373 `from_str` which is available in the prelude.
5374 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
5375 * extra: `dlist`, the doubly-linked list was modernized.
5376 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
5377 * extra: Added `glob` module, replacing `std::os::glob`.
5378 * extra: `rope` was removed.
5379 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
5380 * extra: `net`, and `timer` were removed. The experimental replacements
5381 are `std::rt::io::net` and `std::rt::io::timer`.
5382 * extra: Iterators implemented for `SmallIntMap`.
5383 * extra: Iterators implemented for `Bitv` and `BitvSet`.
5384 * extra: `SmallIntSet` removed. Use `BitvSet`.
5385 * extra: Performance of JSON parsing greatly improved.
5386 * extra: `semver` updated to SemVer 2.0.0.
5387 * extra: `term` handles more terminals correctly.
5388 * extra: `dbg` module removed.
5389 * extra: `par` module removed.
5390 * extra: `future` was cleaned up, with some method renames.
5391 * extra: Most free functions in `getopts` were converted to methods.
5394 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
5395 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
5396 similarly to gcc's `--march` flag.
5397 * rustc's performance compiling small crates is much better.
5398 * rustpkg has received many improvements.
5399 * rustpkg supports git tags as package IDs.
5400 * rustpkg builds into target-specific directories so it can be used for
5402 * The number of concurrent test tasks is controlled by the environment
5403 variable RUST_TEST_TASKS.
5404 * The test harness can now report metrics for benchmarks.
5405 * All tools have man pages.
5406 * Programs compiled with `--test` now support the `-h` and `--help` flags.
5407 * The runtime uses jemalloc for allocations.
5408 * Segmented stacks are temporarily disabled as part of the transition to
5409 the new runtime. Stack overflows are possible!
5410 * A new documentation backend, rustdoc_ng, is available for use. It is
5411 still invoked through the normal `rustdoc` command.
5414 Version 0.7 (2013-07-03)
5415 =======================
5417 * ~2000 changes, numerous bugfixes
5420 * `impl`s no longer accept a visibility qualifier. Put them on methods
5422 * The borrow checker has been rewritten with flow-sensitivity, fixing
5423 many bugs and inconveniences.
5424 * The `self` parameter no longer implicitly means `&'self self`,
5425 and can be explicitly marked with a lifetime.
5426 * Overloadable compound operators (`+=`, etc.) have been temporarily
5427 removed due to bugs.
5428 * The `for` loop protocol now requires `for`-iterators to return `bool`
5429 so they compose better.
5430 * The `Durable` trait is replaced with the `'static` bounds.
5431 * Trait default methods work more often.
5432 * Structs with the `#[packed]` attribute have byte alignment and
5433 no padding between fields.
5434 * Type parameters bound by `Copy` must now be copied explicitly with
5436 * It is now illegal to move out of a dereferenced unsafe pointer.
5437 * `Option<~T>` is now represented as a nullable pointer.
5438 * `@mut` does dynamic borrow checks correctly.
5439 * The `main` function is only detected at the topmost level of the crate.
5440 The `#[main]` attribute is still valid anywhere.
5441 * Struct fields may no longer be mutable. Use inherited mutability.
5442 * The `#[no_send]` attribute makes a type that would otherwise be
5444 * The `#[no_freeze]` attribute makes a type that would otherwise be
5446 * Unbounded recursion will abort the process after reaching the limit
5447 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
5448 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
5449 are never implicitly copyable.
5450 * `#[static_assert]` makes compile-time assertions about static bools.
5451 * At long last, 'argument modes' no longer exist.
5452 * The rarely used `use mod` statement no longer exists.
5455 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
5457 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
5458 `Rand`, `Zero` and `ToStr` can all be automatically derived with
5460 * The `bytes!` macro returns a vector of bytes for string, u8, char,
5461 and unsuffixed integer literals.
5464 * The `core` crate was renamed to `std`.
5465 * The `std` crate was renamed to `extra`.
5466 * More and improved documentation.
5467 * std: `iterator` module for external iterator objects.
5468 * Many old-style (internal, higher-order function) iterators replaced by
5469 implementations of `Iterator`.
5470 * std: Many old internal vector and string iterators,
5471 incl. `any`, `all`. removed.
5472 * std: The `finalize` method of `Drop` renamed to `drop`.
5473 * std: The `drop` method now takes `&mut self` instead of `&self`.
5474 * std: The prelude no longer reexports any modules, only types and traits.
5475 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
5476 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
5477 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
5478 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
5479 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
5480 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
5481 * std: Many types implement `Clone`.
5482 * std: `path` type renamed to `Path`.
5483 * std: `mut` module and `Mut` type removed.
5484 * std: Many standalone functions removed in favor of methods and iterators
5485 in `vec`, `str`. In the future methods will also work as functions.
5486 * std: `reinterpret_cast` removed. Use `transmute`.
5487 * std: ascii string handling in `std::ascii`.
5488 * std: `Rand` is implemented for ~/@.
5489 * std: `run` module for spawning processes overhauled.
5490 * std: Various atomic types added to `unstable::atomic`.
5491 * std: Various types implement `Zero`.
5492 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
5493 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
5494 * std: Added `os::mkdir_recursive`.
5495 * std: Added `os::glob` function performs filesystems globs.
5496 * std: `FuzzyEq` renamed to `ApproxEq`.
5497 * std: `Map` now defines `pop` and `swap` methods.
5498 * std: `Cell` constructors converted to static methods.
5499 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
5500 * extra: `flate` module moved from `std` to `extra`.
5501 * extra: `fileinput` module for iterating over a series of files.
5502 * extra: `Complex` number type and `complex` module.
5503 * extra: `Rational` number type and `rational` module.
5504 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
5505 * extra: `term` uses terminfo now, is more correct.
5506 * extra: `arc` functions converted to methods.
5507 * extra: Implementation of fixed output size variations of SHA-2.
5510 * `unused_variable` lint mode for unused variables (default: warn).
5511 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
5513 * `unused_mut` lint mode for identifying unused `mut` qualifiers
5515 * `dead_assignment` lint mode for unread variables (default: warn).
5516 * `unnecessary_allocation` lint mode detects some heap allocations that are
5517 immediately borrowed so could be written without allocating (default: warn).
5518 * `missing_doc` lint mode (default: allow).
5519 * `unreachable_code` lint mode (default: warn).
5520 * The `rusti` command has been rewritten and a number of bugs addressed.
5521 * rustc outputs in color on more terminals.
5522 * rustc accepts a `--link-args` flag to pass arguments to the linker.
5523 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
5524 * Compiling with `-g` will make the binary record information about
5525 dynamic borrowcheck failures for debugging.
5526 * rustdoc has a nicer stylesheet.
5527 * Various improvements to rustdoc.
5528 * Improvements to rustpkg (see the detailed release notes).
5531 Version 0.6 (2013-04-03)
5532 ========================
5534 * ~2100 changes, numerous bugfixes
5537 * The self type parameter in traits is now spelled `Self`
5538 * The `self` parameter in trait and impl methods must now be explicitly
5539 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
5540 * Static methods no longer require the `static` keyword and instead
5541 are distinguished by the lack of a `self` parameter
5542 * Replaced the `Durable` trait with the `'static` lifetime
5543 * The old closure type syntax with the trailing sigil has been
5544 removed in favor of the more consistent leading sigil
5545 * `super` is a keyword, and may be prefixed to paths
5546 * Trait bounds are separated with `+` instead of whitespace
5547 * Traits are implemented with `impl Trait for Type`
5548 instead of `impl Type: Trait`
5549 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
5550 * The `export` keyword has finally been removed
5551 * The `move` keyword has been removed (see "Semantic changes")
5552 * The interior mutability qualifier on vectors, `[mut T]`, has been
5553 removed. Use `&mut [T]`, etc.
5554 * `mut` is no longer valid in `~mut T`. Use inherited mutability
5555 * `fail` is no longer a keyword. Use `fail!()`
5556 * `assert` is no longer a keyword. Use `assert!()`
5557 * `log` is no longer a keyword. use `debug!`, etc.
5558 * 1-tuples may be represented as `(T,)`
5559 * Struct fields may no longer be `mut`. Use inherited mutability,
5560 `@mut T`, `core::mut` or `core::cell`
5561 * `extern mod { ... }` is no longer valid syntax for foreign
5562 function modules. Use extern blocks: `extern { ... }`
5563 * Newtype enums removed. Use tuple-structs.
5564 * Trait implementations no longer support visibility modifiers
5565 * Pattern matching over vectors improved and expanded
5566 * `const` renamed to `static` to correspond to lifetime name,
5567 and make room for future `static mut` unsafe mutable globals.
5568 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
5569 * `Clone` implementations can be automatically generated with
5570 `#[deriving(Clone)]`
5571 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
5572 instead of `foo as Bar`.
5573 * Fixed length vector types are now written as `[int, .. 3]`
5574 instead of `[int * 3]`.
5575 * Fixed length vector types can express the length as a constant
5576 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
5579 * Types with owned pointers or custom destructors move by default,
5580 eliminating the `move` keyword
5581 * All foreign functions are considered unsafe
5582 * &mut is now unaliasable
5583 * Writes to borrowed @mut pointers are prevented dynamically
5585 * The name of the main function can be customized using #[main]
5586 * The default type of an inferred closure is &fn instead of @fn
5587 * `use` statements may no longer be "chained" - they cannot import
5588 identifiers imported by previous `use` statements
5589 * `use` statements are crate relative, importing from the "top"
5590 of the crate by default. Paths may be prefixed with `super::`
5591 or `self::` to change the search behavior.
5592 * Method visibility is inherited from the implementation declaration
5593 * Structural records have been removed
5594 * Many more types can be used in static items, including enums
5595 'static-lifetime pointers and vectors
5596 * Pattern matching over vectors improved and expanded
5597 * Typechecking of closure types has been overhauled to
5598 improve inference and eliminate unsoundness
5599 * Macros leave scope at the end of modules, unless that module is
5600 tagged with #[macro_escape]
5603 * Added big integers to `std::bigint`
5604 * Removed `core::oldcomm` module
5605 * Added pipe-based `core::comm` module
5606 * Numeric traits have been reorganized under `core::num`
5607 * `vec::slice` finally returns a slice
5608 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
5609 * Containers reorganized around traits in `core::container`
5610 * `core::dvec` removed, `~[T]` is a drop-in replacement
5611 * `core::send_map` renamed to `core::hashmap`
5612 * `std::map` removed; replaced with `core::hashmap`
5613 * `std::treemap` reimplemented as an owned balanced tree
5614 * `std::deque` and `std::smallintmap` reimplemented as owned containers
5615 * `core::trie` added as a fast ordered map for integer keys
5616 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
5617 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
5618 overload the comparison operators, whereas `TotalOrd` is used
5619 by certain container types
5622 * Replaced the 'cargo' package manager with 'rustpkg'
5623 * Added all-purpose 'rust' tool
5624 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
5625 * rustc now *attempts* to offer spelling suggestions
5626 * Improved support for ARM and Android
5627 * Preliminary MIPS backend
5628 * Improved foreign function ABI implementation for x86, x86_64
5629 * Various memory usage improvements
5630 * Rust code may be embedded in foreign code under limited circumstances
5631 * Inline assembler supported by new asm!() syntax extension.
5634 Version 0.5 (2012-12-21)
5635 ===========================
5637 * ~900 changes, numerous bugfixes
5640 * Removed `<-` move operator
5641 * Completed the transition from the `#fmt` extension syntax to `fmt!`
5642 * Removed old fixed length vector syntax - `[T]/N`
5643 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
5644 * Macros may now expand to items and statements
5645 * `a.b()` is always parsed as a method call, never as a field projection
5646 * `Eq` and `IterBytes` implementations can be automatically generated
5647 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
5648 * Removed the special crate language for `.rc` files
5649 * Function arguments may consist of any irrefutable pattern
5652 * `&` and `~` pointers may point to objects
5653 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
5654 * Enum variants may be structs
5655 * Destructors can be added to all nominal types with the Drop trait
5656 * Structs and nullary enum variants may be constants
5657 * Values that cannot be implicitly copied are now automatically moved
5658 without writing `move` explicitly
5659 * `&T` may now be coerced to `*T`
5660 * Coercions happen in `let` statements as well as function calls
5661 * `use` statements now take crate-relative paths
5662 * The module and type namespaces have been merged so that static
5663 method names can be resolved under the trait in which they are
5666 * Improved support for language features
5667 * Trait inheritance works in many scenarios
5668 * More support for explicit self arguments in methods - `self`, `&self`
5669 `@self`, and `~self` all generally work as expected
5670 * Static methods work in more situations
5671 * Experimental: Traits may declare default methods for the implementations
5675 * New condition handling system in `core::condition`
5676 * Timsort added to `std::sort`
5677 * New priority queue, `std::priority_queue`
5678 * Pipes for serializable types, `std::flatpipes'
5679 * Serialization overhauled to be trait-based
5680 * Expanded `getopts` definitions
5681 * Moved futures to `std`
5682 * More functions are pure now
5683 * `core::comm` renamed to `oldcomm`. Still deprecated
5684 * `rustdoc` and `cargo` are libraries now
5687 * Added a preliminary REPL, `rusti`
5688 * License changed from MIT to dual MIT/APL2
5691 Version 0.4 (2012-10-15)
5692 ==========================
5694 * ~2000 changes, numerous bugfixes
5697 * All keywords are now strict and may not be used as identifiers anywhere
5698 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
5699 'of', 'with', 'to', 'class'.
5700 * Classes are replaced with simpler structs
5701 * Explicit method self types
5702 * `ret` became `return` and `alt` became `match`
5703 * `import` is now `use`; `use is now `extern mod`
5704 * `extern mod { ... }` is now `extern { ... }`
5705 * `use mod` is the recommended way to import modules
5706 * `pub` and `priv` replace deprecated export lists
5707 * The syntax of `match` pattern arms now uses fat arrow (=>)
5708 * `main` no longer accepts an args vector; use `os::args` instead
5711 * Trait implementations are now coherent, ala Haskell typeclasses
5712 * Trait methods may be static
5713 * Argument modes are deprecated
5714 * Borrowed pointers are much more mature and recommended for use
5715 * Strings and vectors in the static region are stored in constant memory
5716 * Typestate was removed
5717 * Resolution rewritten to be more reliable
5718 * Support for 'dual-mode' data structures (freezing and thawing)
5721 * Most binary operators can now be overloaded via the traits in
5723 * `std::net::url` for representing URLs
5724 * Sendable hash maps in `core::send_map`
5725 * `core::task' gained a (currently unsafe) task-local storage API
5728 * An efficient new intertask communication primitive called the pipe,
5729 along with a number of higher-level channel types, in `core::pipes`
5730 * `std::arc`, an atomically reference counted, immutable, shared memory
5732 * `std::sync`, various exotic synchronization tools based on arcs and pipes
5733 * Futures are now based on pipes and sendable
5734 * More robust linked task failure
5735 * Improved task builder API
5738 * Improved error reporting
5739 * Preliminary JIT support
5740 * Preliminary work on precise GC
5741 * Extensive architectural improvements to rustc
5742 * Begun a transition away from buggy C++-based reflection (shape) code to
5743 Rust-based (visitor) code
5744 * All hash functions and tables converted to secure, randomized SipHash
5747 Version 0.3 (2012-07-12)
5748 ========================
5750 * ~1900 changes, numerous bugfixes
5752 * New coding conveniences
5753 * Integer-literal suffix inference
5754 * Per-item control over warnings, errors
5755 * #[cfg(windows)] and #[cfg(unix)] attributes
5756 * Documentation comments
5757 * More compact closure syntax
5758 * 'do' expressions for treating higher-order functions as
5760 * *-patterns (wildcard extended to all constructor fields)
5763 * Name resolution pass and exhaustiveness checker rewritten
5764 * Region pointers and borrow checking supersede alias
5766 * Init-ness checking is now provided by a region-based liveness
5767 pass instead of the typestate pass; same for last-use analysis
5768 * Extensive work on region pointers
5770 * Experimental new language features
5771 * Slices and fixed-size, interior-allocated vectors
5772 * #!-comments for lang versioning, shell execution
5773 * Destructors and iface implementation for classes;
5774 type-parameterized classes and class methods
5775 * 'const' type kind for types that can be used to implement
5776 shared-memory concurrency patterns
5780 * Removal of various obsolete features
5781 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
5782 'crust', 'native' (now 'extern'), 'cont' (now 'again')
5784 * Constructs: do-while loops ('do' repurposed), fn binding,
5785 resources (replaced by destructors)
5787 * Compiler reorganization
5788 * Syntax-layer of compiler split into separate crate
5789 * Clang (from LLVM project) integrated into build
5790 * Typechecker split into sub-modules
5793 * New time functions
5794 * Extension methods for many built-in types
5795 * Arc: atomic-refcount read-only / exclusive-use shared cells
5796 * Par: parallel map and search routines
5797 * Extensive work on libuv interface
5798 * Much vector code moved to libraries
5799 * Syntax extensions: #line, #col, #file, #mod, #stringify,
5800 #include, #include_str, #include_bin
5803 * Cargo automatically resolves dependencies
5806 Version 0.2 (2012-03-29)
5807 =========================
5809 * >1500 changes, numerous bugfixes
5811 * New docs and doc tooling
5813 * New port: FreeBSD x86_64
5815 * Compilation model enhancements
5816 * Generics now specialized, multiply instantiated
5817 * Functions now inlined across separate crates
5819 * Scheduling, stack and threading fixes
5820 * Noticeably improved message-passing performance
5821 * Explicit schedulers
5825 * Experimental new language features
5826 * Operator overloading
5830 * Various language extensions
5831 * C-callback function types: 'crust fn ...'
5832 * Infinite-loop construct: 'loop { ... }'
5833 * Shorten 'mutable' to 'mut'
5834 * Required mutable-local qualifier: 'let mut ...'
5835 * Basic glob-exporting: 'export foo::*;'
5836 * Alt now exhaustive, 'alt check' for runtime-checked
5837 * Block-function form of 'for' loop, with 'break' and 'ret'.
5840 * AST quasi-quote syntax extension
5841 * Revived libuv interface
5842 * New modules: core::{future, iter}, std::arena
5843 * Merged per-platform std::{os*, fs*} to core::{libc, os}
5844 * Extensive cleanup, regularization in libstd, libcore
5847 Version 0.1 (2012-01-20)
5848 ===============================
5850 * Most language features work, including:
5851 * Unique pointers, unique closures, move semantics
5852 * Interface-constrained generics
5853 * Static interface dispatch
5855 * Multithread task scheduling
5856 * Typestate predicates
5857 * Failure unwinding, destructors
5858 * Pattern matching and destructuring assignment
5859 * Lightweight block-lambda syntax
5860 * Preliminary macro-by-example
5862 * Compiler works with the following configurations:
5863 * Linux: x86 and x86_64 hosts and targets
5864 * macOS: x86 and x86_64 hosts and targets
5865 * Windows: x86 hosts and targets
5867 * Cross compilation / multi-target configuration supported.
5869 * Preliminary API-documentation and package-management tools included.
5873 * Documentation is incomplete.
5875 * Performance is below intended target.
5877 * Standard library APIs are subject to extensive change, reorganization.
5879 * Language-level versioning is not yet operational - future code will