1 Version 1.25.0 (2018-03-29)
2 ==========================
6 - [Stabilised `#[repr(align(x))]`.][47006] [RFC 1358]
7 - [You can now use nested groups of imports.][47948]
8 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
9 - [You can now have `|` at the start of a match arm.][47947] e.g.
17 | Foo::B => println!("AB"),
18 | Foo::C => println!("C"),
25 - [Upgraded to LLVM 6.][47828]
26 - [Added `-C lto=val` option.][47521]
27 - [Added `i586-unknown-linux-musl` target][47282]
31 - [Impl Send for `process::Command` on Unix.][47760]
32 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
33 - [`UnsafeCell::into_inner` is now safe.][47204]
34 - [Implement libstd for CloudABI.][47268]
35 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
36 - [Implement `AsRef<Path>` for Component][46985]
37 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
38 - [Moved `Duration` to libcore.][46666]
42 - [`Location::column`]
45 The following functions can now be used in a constant expression.
46 eg. `static MINUTE: Duration = Duration::from_secs(60);`
47 - [`Duration::new`][47300]
48 - [`Duration::from_secs`][47300]
49 - [`Duration::from_millis`][47300]
53 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
54 - [`cargo new` now defaults to creating a binary crate, instead of a
55 library crate.][cargo/5029]
59 - [Rust by example is now shipped with new releases][46196]
63 - [Deprecated `net::lookup_host`.][47510]
64 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
65 - The borrow checker was sometimes incorrectly permitting overlapping borrows
66 around indexing operations (see [#47349][47349]). This has been fixed (which also
67 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
68 - [Removed deprecated unstable attribute `#[simd]`.][47251]
70 [33903]: https://github.com/rust-lang/rust/pull/33903
71 [47947]: https://github.com/rust-lang/rust/pull/47947
72 [47948]: https://github.com/rust-lang/rust/pull/47948
73 [47760]: https://github.com/rust-lang/rust/pull/47760
74 [47790]: https://github.com/rust-lang/rust/pull/47790
75 [47828]: https://github.com/rust-lang/rust/pull/47828
76 [47398]: https://github.com/rust-lang/rust/pull/47398
77 [47510]: https://github.com/rust-lang/rust/pull/47510
78 [47521]: https://github.com/rust-lang/rust/pull/47521
79 [47204]: https://github.com/rust-lang/rust/pull/47204
80 [47251]: https://github.com/rust-lang/rust/pull/47251
81 [47268]: https://github.com/rust-lang/rust/pull/47268
82 [47282]: https://github.com/rust-lang/rust/pull/47282
83 [47300]: https://github.com/rust-lang/rust/pull/47300
84 [47349]: https://github.com/rust-lang/rust/pull/47349
85 [46931]: https://github.com/rust-lang/rust/pull/46931
86 [46985]: https://github.com/rust-lang/rust/pull/46985
87 [47006]: https://github.com/rust-lang/rust/pull/47006
88 [46830]: https://github.com/rust-lang/rust/pull/46830
89 [46095]: https://github.com/rust-lang/rust/pull/46095
90 [46666]: https://github.com/rust-lang/rust/pull/46666
91 [46196]: https://github.com/rust-lang/rust/pull/46196
92 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
93 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
94 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
95 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
96 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
99 Version 1.24.1 (2018-03-01)
100 ==========================
102 - [Do not abort when unwinding through FFI][48251]
103 - [Emit UTF-16 files for linker arguments on Windows][48318]
104 - [Make the error index generator work again][48308]
105 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
107 [48251]: https://github.com/rust-lang/rust/issues/48251
108 [48308]: https://github.com/rust-lang/rust/issues/48308
109 [48318]: https://github.com/rust-lang/rust/issues/48318
110 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
113 Version 1.24.0 (2018-02-15)
114 ==========================
118 - [External `sysv64` ffi is now available.][46528]
119 eg. `extern "sysv64" fn foo () {}`
123 - [rustc now uses 16 codegen units by default for release builds.][46910]
124 For the fastest builds, utilize `codegen-units=1`.
125 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
126 - [Add `aarch64-unknown-openbsd` support][46760]
130 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
131 improvement in performance in the majority of cases.
132 - [`OsStr`'s `Debug` implementation is now lossless and consistent
133 with Windows.][46798]
134 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
135 - [impl `From<bool>` for `AtomicBool`][46293]
136 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
137 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
138 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
139 - [float::from_bits now just uses transmute.][46012] This provides
140 some optimisations from LLVM.
141 - [Copied `AsciiExt` methods onto `char`][46077]
142 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
143 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
144 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
145 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
149 - [`RefCell::replace`]
151 - [`atomic::spin_loop_hint`]
153 The following functions can now be used in a constant expression.
154 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
156 - [`AtomicBool::new`][46287]
157 - [`AtomicUsize::new`][46287]
158 - [`AtomicIsize::new`][46287]
159 - [`AtomicPtr::new`][46287]
160 - [`Cell::new`][46287]
161 - [`{integer}::min_value`][46287]
162 - [`{integer}::max_value`][46287]
163 - [`mem::size_of`][46287]
164 - [`mem::align_of`][46287]
165 - [`ptr::null`][46287]
166 - [`ptr::null_mut`][46287]
167 - [`RefCell::new`][46287]
168 - [`UnsafeCell::new`][46287]
172 - [Added a `workspace.default-members` config that
173 overrides implied `--all` in virtual workspaces.][cargo/4743]
174 - [Enable incremental by default on development builds.][cargo/4817] Also added
175 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
176 per-project or global basis respectively.
183 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
184 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
185 in accordance with IETF RFC 4291 ยง2.2.
186 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
187 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
188 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
189 - [Leading zeros in tuple struct members is now an error][47084]
190 - [`column!()` macro is one-based instead of zero-based][46977]
191 - [`fmt::Arguments` can no longer be shared across threads][45198]
192 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
193 - [Cargo sets a different working directory for the compiler][cargo/4788]
195 [44884]: https://github.com/rust-lang/rust/pull/44884
196 [45198]: https://github.com/rust-lang/rust/pull/45198
197 [45506]: https://github.com/rust-lang/rust/pull/45506
198 [45904]: https://github.com/rust-lang/rust/pull/45904
199 [45990]: https://github.com/rust-lang/rust/pull/45990
200 [46012]: https://github.com/rust-lang/rust/pull/46012
201 [46077]: https://github.com/rust-lang/rust/pull/46077
202 [46094]: https://github.com/rust-lang/rust/pull/46094
203 [46284]: https://github.com/rust-lang/rust/pull/46284
204 [46287]: https://github.com/rust-lang/rust/pull/46287
205 [46293]: https://github.com/rust-lang/rust/pull/46293
206 [46528]: https://github.com/rust-lang/rust/pull/46528
207 [46671]: https://github.com/rust-lang/rust/pull/46671
208 [46713]: https://github.com/rust-lang/rust/pull/46713
209 [46735]: https://github.com/rust-lang/rust/pull/46735
210 [46749]: https://github.com/rust-lang/rust/pull/46749
211 [46760]: https://github.com/rust-lang/rust/pull/46760
212 [46798]: https://github.com/rust-lang/rust/pull/46798
213 [46828]: https://github.com/rust-lang/rust/pull/46828
214 [46831]: https://github.com/rust-lang/rust/pull/46831
215 [46833]: https://github.com/rust-lang/rust/pull/46833
216 [46910]: https://github.com/rust-lang/rust/pull/46910
217 [46977]: https://github.com/rust-lang/rust/pull/46977
218 [47018]: https://github.com/rust-lang/rust/pull/47018
219 [47080]: https://github.com/rust-lang/rust/pull/47080
220 [47084]: https://github.com/rust-lang/rust/pull/47084
221 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
222 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
223 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
224 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
225 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
226 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
229 Version 1.23.0 (2018-01-04)
230 ==========================
234 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
235 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
236 Which should fix some confusing errors in some operations.
240 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
241 undefined behaviour.][45920]
242 - [rustc now suggests renaming import if names clash.][45660]
243 - [Display errors/warnings correctly when there are zero-width or
244 wide characters.][45711]
245 - [rustc now avoids unnecessary copies of arguments that are
246 simple bindings][45380] This should improve memory usage on average by 5-10%.
247 - [Updated musl used to build musl rustc to 1.1.17][45393]
251 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
252 - [Implement Hash for raw pointers to unsized types][45483]
253 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
254 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
255 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
256 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
257 and `<*mut T>::as_mut`][44932]
258 - [Optimized `Thread::{park, unpark}` implementation][45524]
259 - [Improved `SliceExt::binary_search` performance.][45333]
260 - [impl `FromIterator<()>` for `()`][45379]
261 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
269 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
270 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
271 - [Added unit test checking to `cargo check`][cargo/4592]
272 - [Cargo now lets you install a specific version
273 using `cargo install --version`][cargo/4637]
277 - [Releases now ship with the Cargo book documentation.][45692]
278 - [rustdoc now prints rendering warnings on every run.][45324]
282 - [Changes have been made to type equality to make it more correct,
283 in rare cases this could break some code.][45853] [Tracking issue for
284 further information][45852]
285 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
286 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
287 Android 9, the minimum supported version is Android 14.
288 - [Bumped the minimum LLVM to 3.9][45326]
290 [44042]: https://github.com/rust-lang/rust/pull/44042
291 [44932]: https://github.com/rust-lang/rust/pull/44932
292 [45267]: https://github.com/rust-lang/rust/pull/45267
293 [45324]: https://github.com/rust-lang/rust/pull/45324
294 [45326]: https://github.com/rust-lang/rust/pull/45326
295 [45333]: https://github.com/rust-lang/rust/pull/45333
296 [45379]: https://github.com/rust-lang/rust/pull/45379
297 [45380]: https://github.com/rust-lang/rust/pull/45380
298 [45393]: https://github.com/rust-lang/rust/pull/45393
299 [45435]: https://github.com/rust-lang/rust/pull/45435
300 [45483]: https://github.com/rust-lang/rust/pull/45483
301 [45524]: https://github.com/rust-lang/rust/pull/45524
302 [45571]: https://github.com/rust-lang/rust/pull/45571
303 [45580]: https://github.com/rust-lang/rust/pull/45580
304 [45610]: https://github.com/rust-lang/rust/pull/45610
305 [45660]: https://github.com/rust-lang/rust/pull/45660
306 [45692]: https://github.com/rust-lang/rust/pull/45692
307 [45711]: https://github.com/rust-lang/rust/pull/45711
308 [45772]: https://github.com/rust-lang/rust/pull/45772
309 [45852]: https://github.com/rust-lang/rust/issues/45852
310 [45853]: https://github.com/rust-lang/rust/pull/45853
311 [45887]: https://github.com/rust-lang/rust/pull/45887
312 [45920]: https://github.com/rust-lang/rust/pull/45920
313 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
314 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
315 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
318 Version 1.22.1 (2017-11-22)
319 ==========================
321 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
323 [46183]: https://github.com/rust-lang/rust/pull/46183
325 Version 1.22.0 (2017-11-22)
326 ==========================
330 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
331 - [Now accepts underscores in unicode escapes][43716]
332 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
333 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
337 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
338 - [rustc will no longer inline in codegen units when compiling for debug][45075]
339 This should decrease compile times for debug builds.
340 - [strict memory alignment now enabled on ARMv6][45094]
341 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
345 - [Allow atomic operations up to 32 bits
346 on `armv5te_unknown_linux_gnueabi`][44978]
347 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
348 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
349 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
350 - [Properly detect overflow in `Instant += Duration`.][44220]
351 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
352 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
353 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
360 - [Cargo will now build multi file examples in subdirectories of the `examples`
361 folder that have a `main.rs` file.][cargo/4496]
362 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
363 the old format will continue to work and can be updated with `cargo update`.
364 - [Now supports vendoring git repositories][cargo/3992]
368 - [`libbacktrace` is now available on Apple platforms.][44251]
369 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
370 This now lets you specify that a given code example will fail to compile.
374 - [The minimum Android version that rustc can build for has been bumped
375 to `4.0` from `2.3`][45656]
376 - [Allowing `T op= &T` for numeric types has broken some type
377 inference cases][45480]
380 [42526]: https://github.com/rust-lang/rust/pull/42526
381 [43017]: https://github.com/rust-lang/rust/pull/43017
382 [43716]: https://github.com/rust-lang/rust/pull/43716
383 [43949]: https://github.com/rust-lang/rust/pull/43949
384 [44015]: https://github.com/rust-lang/rust/pull/44015
385 [44220]: https://github.com/rust-lang/rust/pull/44220
386 [44251]: https://github.com/rust-lang/rust/pull/44251
387 [44287]: https://github.com/rust-lang/rust/pull/44287
388 [44303]: https://github.com/rust-lang/rust/pull/44303
389 [44456]: https://github.com/rust-lang/rust/pull/44456
390 [44466]: https://github.com/rust-lang/rust/pull/44466
391 [44895]: https://github.com/rust-lang/rust/pull/44895
392 [44966]: https://github.com/rust-lang/rust/pull/44966
393 [44978]: https://github.com/rust-lang/rust/pull/44978
394 [45041]: https://github.com/rust-lang/rust/pull/45041
395 [45064]: https://github.com/rust-lang/rust/pull/45064
396 [45075]: https://github.com/rust-lang/rust/pull/45075
397 [45094]: https://github.com/rust-lang/rust/pull/45094
398 [45095]: https://github.com/rust-lang/rust/pull/45095
399 [45480]: https://github.com/rust-lang/rust/issues/45480
400 [45656]: https://github.com/rust-lang/rust/pull/45656
401 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
402 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
403 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
410 Version 1.21.0 (2017-10-12)
411 ==========================
415 - [You can now use static references for literals.][43838]
419 let x: &'static u32 = &0;
422 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
425 my_macro!(Vec<i32>::new); // Always worked
426 my_macro!(Vec::<i32>::new); // Now works
431 - [Upgraded jemalloc to 4.5.0][43911]
432 - [Enabled unwinding panics on Redox][43917]
433 - [Now runs LLVM in parallel during translation phase.][43506]
434 This should reduce peak memory usage.
438 - [Generate builtin impls for `Clone` for all arrays and tuples that
439 are `T: Clone`][43690]
440 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
441 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
442 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
447 [`std::mem::discriminant`]
451 - [You can now call `cargo install` with multiple package names][cargo/4216]
452 - [Cargo commands inside a virtual workspace will now implicitly
453 pass `--all`][cargo/4335]
454 - [Added a `[patch]` section to `Cargo.toml` to handle
455 prepublication dependencies][cargo/4123] [RFC 1969]
456 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
457 like patterns][cargo/4270]
458 - [Added the `--all-targets` option][cargo/4400]
459 - [Using required dependencies as a feature is now deprecated and emits
460 a warning][cargo/4364]
465 - [Cargo docs are moving][43916]
466 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
467 - [The rustdoc book is now available][43863]
468 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
469 - [Added a preview of RLS has been made available through rustup][44204]
470 Install with `rustup component add rls-preview`
471 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
472 Previously only showed `std::os::unix`.
476 - [Changes in method matching against higher-ranked types][43880] This may cause
477 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
478 - [rustc's JSON error output's byte position start at top of file.][42973]
479 Was previously relative to the rustc's internal `CodeMap` struct which
480 required the unstable library `libsyntax` to correctly use.
481 - [`unused_results` lint no longer ignores booleans][43728]
483 [42565]: https://github.com/rust-lang/rust/pull/42565
484 [42973]: https://github.com/rust-lang/rust/pull/42973
485 [43348]: https://github.com/rust-lang/rust/pull/43348
486 [43459]: https://github.com/rust-lang/rust/pull/43459
487 [43506]: https://github.com/rust-lang/rust/pull/43506
488 [43540]: https://github.com/rust-lang/rust/pull/43540
489 [43690]: https://github.com/rust-lang/rust/pull/43690
490 [43728]: https://github.com/rust-lang/rust/pull/43728
491 [43838]: https://github.com/rust-lang/rust/pull/43838
492 [43863]: https://github.com/rust-lang/rust/pull/43863
493 [43880]: https://github.com/rust-lang/rust/pull/43880
494 [43911]: https://github.com/rust-lang/rust/pull/43911
495 [43916]: https://github.com/rust-lang/rust/pull/43916
496 [43917]: https://github.com/rust-lang/rust/pull/43917
497 [44204]: https://github.com/rust-lang/rust/pull/44204
498 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
499 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
500 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
501 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
502 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
503 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
504 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
505 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
506 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
508 Version 1.20.0 (2017-08-31)
509 ===========================
513 - [Associated constants are now stabilised.][42809]
514 - [A lot of macro bugs are now fixed.][42913]
519 - [Struct fields are now properly coerced to the expected field type.][42807]
520 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
521 `wasm32-experimental-emscripten` target.
522 - [Changed some of the error messages to be more helpful.][42033]
523 - [Add support for RELRO(RELocation Read-Only) for platforms that support
525 - [rustc now reports the total number of errors on compilation failure][43015]
526 previously this was only the number of errors in the pass that failed.
527 - [Expansion in rustc has been sped up 29x.][42533]
528 - [added `msp430-none-elf` target.][43099]
529 - [rustc will now suggest one-argument enum variant to fix type mismatch when
531 - [Fixes backtraces on Redox][43228]
532 - [rustc now identifies different versions of same crate when absolute paths of
533 different types match in an error message.][42826]
539 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
540 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
542 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
543 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
544 - [Impl `Clone` for `DefaultHasher`.][42799]
545 - [Impl `Sync` for `SyncSender`.][42397]
546 - [Impl `FromStr` for `char`][42271]
547 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
549 - [allow messages in the `unimplemented!()` macro.][42155]
550 ie. `unimplemented!("Waiting for 1.21 to be stable")`
551 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
552 - [Upgrade to Unicode 10.0.0][42999]
553 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
554 - [Skip the main thread's manual stack guard on Linux][43072]
555 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
556 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
558 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
563 - [`CStr::into_c_string`]
564 - [`CString::as_c_str`]
565 - [`CString::into_boxed_c_str`]
568 - [`Chain::into_inner`]
569 - [`Option::get_or_insert_with`]
570 - [`Option::get_or_insert`]
571 - [`OsStr::into_os_string`]
572 - [`OsString::into_boxed_os_str`]
575 - [`Utf8Error::error_len`]
576 - [`char::EscapeDebug`]
577 - [`char::escape_debug`]
583 - [`mem::ManuallyDrop`]
584 - [`slice::sort_unstable_by_key`]
585 - [`slice::sort_unstable_by`]
586 - [`slice::sort_unstable`]
587 - [`str::from_boxed_utf8_unchecked`]
588 - [`str::as_bytes_mut`]
589 - [`str::as_bytes_mut`]
590 - [`str::from_utf8_mut`]
591 - [`str::from_utf8_unchecked_mut`]
593 - [`str::get_unchecked_mut`]
594 - [`str::get_unchecked`]
596 - [`str::into_boxed_bytes`]
601 - [Cargo API token location moved from `~/.cargo/config` to
602 `~/.cargo/credentials`.][cargo/3978]
603 - [Cargo will now build `main.rs` binaries that are in sub-directories of
604 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
605 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
606 - [You can now specify version of a binary when installed through
607 `cargo install` using `--vers`.][cargo/4229]
608 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
609 failure.][cargo/4248]
610 - [Changed the convention around which file is the crate root.][cargo/4259]
611 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
612 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
617 - [Functions with `'static` in their return types will now not be as usable as
618 if they were using lifetime parameters instead.][42417]
619 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
620 takes the sign of NaN into account where previously didn't.][42430]
622 [42033]: https://github.com/rust-lang/rust/pull/42033
623 [42155]: https://github.com/rust-lang/rust/pull/42155
624 [42271]: https://github.com/rust-lang/rust/pull/42271
625 [42397]: https://github.com/rust-lang/rust/pull/42397
626 [42417]: https://github.com/rust-lang/rust/pull/42417
627 [42430]: https://github.com/rust-lang/rust/pull/42430
628 [42431]: https://github.com/rust-lang/rust/pull/42431
629 [42533]: https://github.com/rust-lang/rust/pull/42533
630 [42571]: https://github.com/rust-lang/rust/pull/42571
631 [42613]: https://github.com/rust-lang/rust/pull/42613
632 [42799]: https://github.com/rust-lang/rust/pull/42799
633 [42807]: https://github.com/rust-lang/rust/pull/42807
634 [42809]: https://github.com/rust-lang/rust/pull/42809
635 [42822]: https://github.com/rust-lang/rust/pull/42822
636 [42826]: https://github.com/rust-lang/rust/pull/42826
637 [42854]: https://github.com/rust-lang/rust/pull/42854
638 [42913]: https://github.com/rust-lang/rust/pull/42913
639 [42999]: https://github.com/rust-lang/rust/pull/42999
640 [43011]: https://github.com/rust-lang/rust/pull/43011
641 [43015]: https://github.com/rust-lang/rust/pull/43015
642 [43072]: https://github.com/rust-lang/rust/pull/43072
643 [43077]: https://github.com/rust-lang/rust/pull/43077
644 [43097]: https://github.com/rust-lang/rust/pull/43097
645 [43099]: https://github.com/rust-lang/rust/pull/43099
646 [43170]: https://github.com/rust-lang/rust/pull/43170
647 [43178]: https://github.com/rust-lang/rust/pull/43178
648 [43185]: https://github.com/rust-lang/rust/pull/43185
649 [43228]: https://github.com/rust-lang/rust/pull/43228
650 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
651 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
652 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
653 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
654 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
655 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
656 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
657 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
658 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
659 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
660 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
661 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
662 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
663 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
664 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
665 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
666 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
667 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
668 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
669 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
670 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
671 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
672 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
673 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
674 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
675 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
676 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
677 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
678 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
679 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
680 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
681 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
682 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
683 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
684 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
685 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
686 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
687 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
688 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
691 Version 1.19.0 (2017-07-20)
692 ===========================
697 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
698 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
699 - [Macro recursion limit increased to 1024 from 64.][41676]
700 - [Added lint for detecting unused macros.][41907]
701 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
702 For example: `let x = loop { break 7; };`
703 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
704 contain `Copy` types and cannot have a `Drop` implementation.
705 Example: `union Foo { bar: u8, baz: usize }`
706 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
707 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
712 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
713 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
714 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
715 you should use `--target armv7-linux-androideabi`.
716 - [Fixed ICE when removing a source file between compilation sessions.][41873]
717 - [Minor optimisation of string operations.][42037]
718 - [Compiler error message is now `aborting due to previous error(s)` instead of
719 `aborting due to N previous errors`][42150] This was previously inaccurate and
720 would only count certain kinds of errors.
721 - [The compiler now supports Visual Studio 2017][42225]
722 - [The compiler is now built against LLVM 4.0.1 by default][42948]
723 - [Added a lot][42264] of [new error codes][42302]
724 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
725 libraries with C Run-time Libraries(CRT) to be statically linked.
726 - [Fixed various ARM codegen bugs][42740]
731 - [`String` now implements `FromIterator<Cow<'a, str>>` and
732 `Extend<Cow<'a, str>>`][41449]
733 - [`Vec` now implements `From<&mut [T]>`][41530]
734 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
735 - [`SplitWhitespace` now implements `Clone`][41659]
736 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
738 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
739 macros, but for printing to stderr.
744 - [`OsString::shrink_to_fit`]
747 - [`thread::ThreadId`]
752 - [Build scripts can now add environment variables to the environment
753 the crate is being compiled in.
754 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
755 - [Subcommands now replace the current process rather than spawning a new
756 child process][cargo/3970]
757 - [Workspace members can now accept glob file patterns][cargo/3979]
758 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
759 the members in a given workspace.][cargo/3988]
760 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
761 - [Target directory path is now in the cargo metadata][cargo/4022]
762 - [Cargo no longer checks out a local working directory for the
763 crates.io index][cargo/4026] This should provide smaller file size for the
764 registry, and improve cloning times, especially on Windows machines.
765 - [Added an `--exclude` option for excluding certain packages when using the
766 `--all` option][cargo/4031]
767 - [Cargo will now automatically retry when receiving a 5xx error
768 from crates.io][cargo/4032]
769 - [The `--features` option now accepts multiple comma or space
770 delimited values.][cargo/4084]
771 - [Added support for custom target specific runners][cargo/3954]
776 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
778 - [Rust will now release XZ compressed packages][rust-installer/57]
779 - [rustup will now prefer to download rust packages with
780 XZ compression][rustup/1100] over GZip packages.
781 - [Added the ability to escape `#` in rust documentation][41785] By adding
782 additional `#`'s ie. `##` is now `#`
787 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
788 - [`-Z` flags are now no longer allowed to be used on the stable
789 compiler.][41751] This has been a warning for a year previous to this.
790 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
791 longer works][42844]. Users should migrate to the built-in `check`
792 command, which has been available since 1.16.
793 - [Ending a float literal with `._` is now a hard error.
794 Example: `42._` .][41946]
795 - [Any use of a private `extern crate` outside of its module is now a
796 hard error.][36886] This was previously a warning.
797 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
798 relative while the `::` prefix makes a path absolute, but was ignored and the
799 path was relative regardless.
800 - [Floating point constants in match patterns is now a hard error][36890]
801 This was previously a warning.
802 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
803 match patterns is now a hard error][36891] This was previously a warning.
804 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
806 - [From the pound escape, lines consisting of multiple `#`s are
808 - [It is an error to re-export private enum variants][42460]. This is
809 known to break a number of crates that depend on an older version of
811 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
812 to use it to find the linker, and the build will fail where it did
813 not previously][42607]
815 [36886]: https://github.com/rust-lang/rust/issues/36886
816 [36888]: https://github.com/rust-lang/rust/issues/36888
817 [36890]: https://github.com/rust-lang/rust/issues/36890
818 [36891]: https://github.com/rust-lang/rust/issues/36891
819 [36892]: https://github.com/rust-lang/rust/issues/36892
820 [37406]: https://github.com/rust-lang/rust/issues/37406
821 [39983]: https://github.com/rust-lang/rust/pull/39983
822 [41145]: https://github.com/rust-lang/rust/pull/41145
823 [41192]: https://github.com/rust-lang/rust/pull/41192
824 [41258]: https://github.com/rust-lang/rust/pull/41258
825 [41370]: https://github.com/rust-lang/rust/pull/41370
826 [41449]: https://github.com/rust-lang/rust/pull/41449
827 [41530]: https://github.com/rust-lang/rust/pull/41530
828 [41624]: https://github.com/rust-lang/rust/pull/41624
829 [41656]: https://github.com/rust-lang/rust/pull/41656
830 [41659]: https://github.com/rust-lang/rust/pull/41659
831 [41676]: https://github.com/rust-lang/rust/pull/41676
832 [41751]: https://github.com/rust-lang/rust/pull/41751
833 [41764]: https://github.com/rust-lang/rust/pull/41764
834 [41785]: https://github.com/rust-lang/rust/pull/41785
835 [41873]: https://github.com/rust-lang/rust/pull/41873
836 [41907]: https://github.com/rust-lang/rust/pull/41907
837 [41946]: https://github.com/rust-lang/rust/pull/41946
838 [42016]: https://github.com/rust-lang/rust/pull/42016
839 [42037]: https://github.com/rust-lang/rust/pull/42037
840 [42068]: https://github.com/rust-lang/rust/pull/42068
841 [42150]: https://github.com/rust-lang/rust/pull/42150
842 [42162]: https://github.com/rust-lang/rust/pull/42162
843 [42225]: https://github.com/rust-lang/rust/pull/42225
844 [42264]: https://github.com/rust-lang/rust/pull/42264
845 [42302]: https://github.com/rust-lang/rust/pull/42302
846 [42460]: https://github.com/rust-lang/rust/issues/42460
847 [42607]: https://github.com/rust-lang/rust/issues/42607
848 [42740]: https://github.com/rust-lang/rust/pull/42740
849 [42844]: https://github.com/rust-lang/rust/issues/42844
850 [42948]: https://github.com/rust-lang/rust/pull/42948
851 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
852 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
853 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
854 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
855 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
856 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
857 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
858 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
859 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
860 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
861 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
862 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
863 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
864 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
865 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
866 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
867 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
868 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
869 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
870 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
871 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
872 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
875 Version 1.18.0 (2017-06-08)
876 ===========================
881 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
882 make the item visible to just that module tree. Also accepts the keyword
883 `crate` to make something public to the whole crate but not users of the
884 library. Example: `pub(crate) mod utils;`. [RFC 1422].
885 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
886 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
887 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
888 types like `Write + Send`, trailing `+` are now supported in trait objects,
889 and better error reporting for trait objects starting with `?Sized`.
890 - [0e+10 is now a valid floating point literal][40589]
891 - [Now warns if you bind a lifetime parameter to 'static][40734]
892 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
893 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
894 representation in some cases.][40377]
899 - [rustc can now emit mir with `--emit mir`][39891]
900 - [Improved LLVM IR for trivial functions][40367]
901 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
902 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
903 opportunities found through profiling
904 - [Improved backtrace formatting when panicking][38165]
909 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
910 iterator hasn't been advanced the original `Vec` is reassembled with no actual
911 iteration or reallocation.
912 - [Simplified HashMap Bucket interface][40561] provides performance
913 improvements for iterating and cloning.
914 - [Specialize Vec::from_elem to use calloc][40409]
915 - [Fixed Race condition in fs::create_dir_all][39799]
916 - [No longer caching stdio on Windows][40516]
917 - [Optimized insertion sort in slice][40807] insertion sort in some cases
918 2.50%~ faster and in one case now 12.50% faster.
919 - [Optimized `AtomicBool::fetch_nand`][41143]
924 - [`Child::try_wait`]
925 - [`HashMap::retain`]
926 - [`HashSet::retain`]
928 - [`TcpStream::peek`]
929 - [`UdpSocket::peek`]
930 - [`UdpSocket::peek_from`]
935 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
936 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
937 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
938 - [Added Android build support][cargo/3885]
939 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
940 of a certain type, for example `cargo build --bins` will build all
942 - [Added support for haiku][cargo/3952]
947 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
948 - [Added rust-windbg script for better debugging on Windows][39983]
949 - [Rust now uses the official cross compiler for NetBSD][40612]
950 - [rustdoc now accepts `#` at the start of files][40828]
951 - [Fixed jemalloc support for musl][41168]
956 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
957 always placed after the sign if it exists and before the digits. With the `#`
958 flag the zeroes are placed after the prefix and before the digits.
959 - [Due to the struct field optimisation][40377], using `transmute` on structs
960 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
961 always been undefined behavior, but is now more likely to break in practice.
962 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
963 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
964 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
965 - [Overlapping inherent `impl`s are now a hard error][40728]
966 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
967 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
968 `out.asm` and `out.ll` instead of only one of the filetypes.
969 - [ calling a function that returns `Self` will no longer work][41805] when
970 the size of `Self` cannot be statically determined.
971 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
972 this has caused a few regressions namely:
974 - Changed the link order of local static/dynamic libraries (respecting the
975 order on given rather than having the compiler reorder).
976 - Changed how MinGW is linked, native code linked to dynamic libraries
977 may require manually linking to the gcc support library (for the native
980 [38165]: https://github.com/rust-lang/rust/pull/38165
981 [39799]: https://github.com/rust-lang/rust/pull/39799
982 [39891]: https://github.com/rust-lang/rust/pull/39891
983 [39983]: https://github.com/rust-lang/rust/pull/39983
984 [40043]: https://github.com/rust-lang/rust/pull/40043
985 [40241]: https://github.com/rust-lang/rust/pull/40241
986 [40338]: https://github.com/rust-lang/rust/pull/40338
987 [40367]: https://github.com/rust-lang/rust/pull/40367
988 [40377]: https://github.com/rust-lang/rust/pull/40377
989 [40409]: https://github.com/rust-lang/rust/pull/40409
990 [40516]: https://github.com/rust-lang/rust/pull/40516
991 [40556]: https://github.com/rust-lang/rust/pull/40556
992 [40561]: https://github.com/rust-lang/rust/pull/40561
993 [40589]: https://github.com/rust-lang/rust/pull/40589
994 [40612]: https://github.com/rust-lang/rust/pull/40612
995 [40723]: https://github.com/rust-lang/rust/pull/40723
996 [40728]: https://github.com/rust-lang/rust/pull/40728
997 [40731]: https://github.com/rust-lang/rust/pull/40731
998 [40734]: https://github.com/rust-lang/rust/pull/40734
999 [40805]: https://github.com/rust-lang/rust/pull/40805
1000 [40807]: https://github.com/rust-lang/rust/pull/40807
1001 [40828]: https://github.com/rust-lang/rust/pull/40828
1002 [40870]: https://github.com/rust-lang/rust/pull/40870
1003 [41085]: https://github.com/rust-lang/rust/pull/41085
1004 [41143]: https://github.com/rust-lang/rust/pull/41143
1005 [41168]: https://github.com/rust-lang/rust/pull/41168
1006 [41270]: https://github.com/rust-lang/rust/issues/41270
1007 [41469]: https://github.com/rust-lang/rust/pull/41469
1008 [41805]: https://github.com/rust-lang/rust/issues/41805
1009 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1010 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1011 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1012 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1013 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1014 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1015 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1016 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1017 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1018 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1019 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1020 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1021 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1022 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1025 Version 1.17.0 (2017-04-27)
1026 ===========================
1031 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1032 * [Fields of structs may be initialized without duplicating the field/variable
1033 names][39761]. [RFC 1682]
1034 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1035 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1036 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1037 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1038 `'b`. Soundness fix.
1039 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1040 * [Static variables may contain references to other statics][40027]
1045 * [Exit quickly on only `--emit dep-info`][40336]
1046 * [Make `-C relocation-model` more correctly determine whether the linker
1047 creates a position-independent executable][40245]
1048 * [Add `-C overflow-checks` to directly control whether integer overflow
1050 * [The rustc type checker now checks items on demand instead of in a single
1051 in-order pass][40008]. This is mostly an internal refactoring in support of
1052 future work, including incremental type checking, but also resolves [RFC
1053 1647], allowing `Self` to appear in `impl` `where` clauses.
1054 * [Optimize vtable loads][39995]
1055 * [Turn off vectorization for Emscripten targets][39990]
1056 * [Provide suggestions for unknown macros imported with `use`][39953]
1057 * [Fix ICEs in path resolution][39939]
1058 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1059 * [Add clearer error message using `&str + &str`][39116]
1070 * [`Ordering::then`]
1071 * [`Ordering::then_with`]
1072 * [`BTreeMap::range`]
1073 * [`BTreeMap::range_mut`]
1074 * [`collections::Bound`]
1075 * [`process::abort`]
1076 * [`ptr::read_unaligned`]
1077 * [`ptr::write_unaligned`]
1078 * [`Result::expect_err`]
1081 * [`Cell::into_inner`]
1087 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1088 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1089 * [`String` implements `FromIterator<&char>`][40028]
1090 * `Box` [implements][40009] a number of new conversions:
1091 `From<Box<str>> for String`,
1092 `From<Box<[T]>> for Vec<T>`,
1093 `From<Box<CStr>> for CString`,
1094 `From<Box<OsStr>> for OsString`,
1095 `From<Box<Path>> for PathBuf`,
1096 `Into<Box<str>> for String`,
1097 `Into<Box<[T]>> for Vec<T>`,
1098 `Into<Box<CStr>> for CString`,
1099 `Into<Box<OsStr>> for OsString`,
1100 `Into<Box<Path>> for PathBuf`,
1101 `Default for Box<str>`,
1102 `Default for Box<CStr>`,
1103 `Default for Box<OsStr>`,
1104 `From<&CStr> for Box<CStr>`,
1105 `From<&OsStr> for Box<OsStr>`,
1106 `From<&Path> for Box<Path>`
1107 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1108 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1109 * [Slightly optimize `slice::sort`][39538]
1110 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1111 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1112 `Box<str>` implements `From<&str>`][39438]
1113 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1114 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1115 * [`format!` estimates the needed capacity before writing a string][39356]
1116 * [Support unprivileged symlink creation in Windows][38921]
1117 * [`PathBuf` implements `Default`][38764]
1118 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1119 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1120 and poor hash functions.
1125 * [Add `cargo check --all`][cargo/3731]
1126 * [Add an option to ignore SSL revocation checking][cargo/3699]
1127 * [Add `cargo run --package`][cargo/3691]
1128 * [Add `required_features`][cargo/3667]
1129 * [Assume `build.rs` is a build script][cargo/3664]
1130 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1135 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1137 * [The "Unstable Book" documents nightly-only features][ubook]
1138 * [Improve the style of the sidebar in rustdoc output][40265]
1139 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1140 * [Fix MSP430 breakage due to `i128`][40257]
1141 * [Preliminary Solaris/SPARCv9 support][39903]
1142 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1143 run without installing the MSVC runtime.
1144 * [`rustdoc --test` includes file names in test names][39788]
1145 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1146 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1147 * [Initial support for `aarch64-unknown-freebsd`][39491]
1148 * [Initial support for `i686-unknown-netbsd`][39426]
1149 * [This release no longer includes the old makefile build system][39431]. Rust
1150 is built with a custom build system, written in Rust, and with Cargo.
1151 * [Add Debug implementations for libcollection structs][39002]
1152 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1153 * [`--test-threads=0` produces an error][38945]
1154 * [`rustup` installs documentation by default][40526]
1155 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1156 WinDbg and Visual Studio to improve the debugging experience.
1161 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1162 workaround, either use MSVC 2015 or run vcvars.bat.
1163 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1164 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1165 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1167 * [`format!` and `Display::to_string` panic if an underlying formatting
1168 implementation returns an error][40117]. Previously the error was silently
1169 ignored. It is incorrect for `write_fmt` to return an error when writing
1171 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1172 crates were marked stable and could be accessed from the stable toolchain.
1173 * [Rust git source no longer includes vendored crates][39728]. Those that need
1174 to build with vendored crates should build from release tarballs.
1175 * [Fix inert attributes from `proc_macro_derives`][39572]
1176 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1177 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1179 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1180 existing code generally ignores the type of dead-code unless a type-hint is
1181 provided; this can cause surprising inference interactions particularly around
1182 defaulting. The new code uniformly ignores the result type of dead-code.
1183 * [Tuple-struct constructors with private fields are no longer visible][38932]
1184 * [Lifetime parameters that do not appear in the arguments are now considered
1185 early-bound][38897], resolving a soundness bug (#[32330]). The
1186 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1188 * [rustdoc: fix doctests with non-feature crate attributes][38161]
1189 * [Make transmuting from fn item types to pointer-sized types a hard
1192 [27787]: https://github.com/rust-lang/rust/issues/27787
1193 [32330]: https://github.com/rust-lang/rust/issues/32330
1194 [34198]: https://github.com/rust-lang/rust/pull/34198
1195 [38161]: https://github.com/rust-lang/rust/pull/38161
1196 [38368]: https://github.com/rust-lang/rust/pull/38368
1197 [38584]: https://github.com/rust-lang/rust/issues/38584
1198 [38661]: https://github.com/rust-lang/rust/pull/38661
1199 [38764]: https://github.com/rust-lang/rust/pull/38764
1200 [38864]: https://github.com/rust-lang/rust/issues/38864
1201 [38897]: https://github.com/rust-lang/rust/pull/38897
1202 [38921]: https://github.com/rust-lang/rust/pull/38921
1203 [38932]: https://github.com/rust-lang/rust/pull/38932
1204 [38945]: https://github.com/rust-lang/rust/pull/38945
1205 [38981]: https://github.com/rust-lang/rust/pull/38981
1206 [39002]: https://github.com/rust-lang/rust/pull/39002
1207 [39116]: https://github.com/rust-lang/rust/pull/39116
1208 [39193]: https://github.com/rust-lang/rust/pull/39193
1209 [39265]: https://github.com/rust-lang/rust/pull/39265
1210 [39356]: https://github.com/rust-lang/rust/pull/39356
1211 [39372]: https://github.com/rust-lang/rust/pull/39372
1212 [39426]: https://github.com/rust-lang/rust/pull/39426
1213 [39431]: https://github.com/rust-lang/rust/pull/39431
1214 [39438]: https://github.com/rust-lang/rust/pull/39438
1215 [39440]: https://github.com/rust-lang/rust/pull/39440
1216 [39485]: https://github.com/rust-lang/rust/pull/39485
1217 [39491]: https://github.com/rust-lang/rust/pull/39491
1218 [39518]: https://github.com/rust-lang/rust/pull/39518
1219 [39538]: https://github.com/rust-lang/rust/pull/39538
1220 [39572]: https://github.com/rust-lang/rust/pull/39572
1221 [39633]: https://github.com/rust-lang/rust/pull/39633
1222 [39642]: https://github.com/rust-lang/rust/pull/39642
1223 [39728]: https://github.com/rust-lang/rust/pull/39728
1224 [39761]: https://github.com/rust-lang/rust/pull/39761
1225 [39788]: https://github.com/rust-lang/rust/pull/39788
1226 [39793]: https://github.com/rust-lang/rust/pull/39793
1227 [39837]: https://github.com/rust-lang/rust/pull/39837
1228 [39843]: https://github.com/rust-lang/rust/pull/39843
1229 [39851]: https://github.com/rust-lang/rust/pull/39851
1230 [39903]: https://github.com/rust-lang/rust/pull/39903
1231 [39939]: https://github.com/rust-lang/rust/pull/39939
1232 [39953]: https://github.com/rust-lang/rust/pull/39953
1233 [39960]: https://github.com/rust-lang/rust/pull/39960
1234 [39990]: https://github.com/rust-lang/rust/pull/39990
1235 [39995]: https://github.com/rust-lang/rust/pull/39995
1236 [40008]: https://github.com/rust-lang/rust/pull/40008
1237 [40009]: https://github.com/rust-lang/rust/pull/40009
1238 [40027]: https://github.com/rust-lang/rust/pull/40027
1239 [40028]: https://github.com/rust-lang/rust/pull/40028
1240 [40037]: https://github.com/rust-lang/rust/pull/40037
1241 [40117]: https://github.com/rust-lang/rust/pull/40117
1242 [40166]: https://github.com/rust-lang/rust/pull/40166
1243 [40245]: https://github.com/rust-lang/rust/pull/40245
1244 [40257]: https://github.com/rust-lang/rust/pull/40257
1245 [40261]: https://github.com/rust-lang/rust/pull/40261
1246 [40265]: https://github.com/rust-lang/rust/pull/40265
1247 [40319]: https://github.com/rust-lang/rust/pull/40319
1248 [40336]: https://github.com/rust-lang/rust/pull/40336
1249 [40526]: https://github.com/rust-lang/rust/pull/40526
1250 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1251 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
1252 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
1253 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
1254 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
1255 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
1256 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
1257 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
1258 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
1259 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
1260 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
1261 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
1262 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
1263 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
1264 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1265 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
1266 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
1267 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
1268 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
1269 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
1270 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
1271 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
1272 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
1273 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
1274 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
1275 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
1276 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
1277 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
1278 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
1279 [mdbook]: https://crates.io/crates/mdbook
1280 [ubook]: https://doc.rust-lang.org/unstable-book/
1283 Version 1.16.0 (2017-03-16)
1284 ===========================
1289 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1290 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1291 match patterns][38069]
1292 * [Clean up semantics of `self` in an import list][38313]
1293 * [`Self` may appear in `impl` headers][38920]
1294 * [`Self` may appear in struct expressions][39282]
1299 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
1300 a `.rmeta` file containing only crate metadata][38571]. This can be
1301 used by tools like the Rust Language Service to perform
1302 metadata-only builds.
1303 * [Levenshtein based typo suggestions now work in most places, while
1304 previously they worked only for fields and sometimes for local
1305 variables][38927]. Together with the overhaul of "no
1306 resolution"/"unexpected resolution" errors (#[38154]) they result in
1307 large and systematic improvement in resolution diagnostics.
1308 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
1310 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
1311 * [`rustc` no longer attempts to provide "consider using an explicit
1312 lifetime" suggestions][37057]. They were inaccurate.
1317 * [`VecDeque::truncate`]
1318 * [`VecDeque::resize`]
1319 * [`String::insert_str`]
1320 * [`Duration::checked_add`]
1321 * [`Duration::checked_sub`]
1322 * [`Duration::checked_div`]
1323 * [`Duration::checked_mul`]
1326 * [`SocketAddr::is_ipv4`]
1327 * [`SocketAddr::is_ipv6`]
1328 * [`IpAddr::is_ipv4`]
1329 * [`IpAddr::is_ipv6`]
1331 * [`Vec::dedup_by_key`]
1332 * [`Result::unwrap_or_default`]
1333 * [`<*const T>::wrapping_offset`]
1334 * [`<*mut T>::wrapping_offset`]
1335 * `CommandExt::creation_flags`
1336 * [`File::set_permissions`]
1337 * [`String::split_off`]
1342 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
1343 their argument by `Borrow` parameter][37761]
1344 * [All public types in std implement `Debug`][38006]
1345 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
1346 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
1347 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1349 * [std: Fix partial writes in `LineWriter`][38062]
1350 * [std: Clamp max read/write sizes on Unix][38062]
1351 * [Use more specific panic message for `&str` slicing errors][38066]
1352 * [`TcpListener::set_only_v6` is deprecated][38304]. This
1353 functionality cannot be achieved in std currently.
1354 * [`writeln!`, like `println!`, now accepts a form with no string
1355 or formatting arguments, to just print a newline][38469]
1356 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
1357 * [Reduce the size of static data in `std_unicode::tables`][38781]
1358 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
1359 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
1361 * [`Duration` implements `Sum`][38712]
1362 * [`String` implements `ToSocketAddrs`][39048]
1367 * [The `cargo check` command does a type check of a project without
1368 building it][cargo/3296]
1369 * [crates.io will display CI badges from Travis and AppVeyor, if
1370 specified in Cargo.toml][cargo/3546]
1371 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
1372 * [Compilation profiles accept integer values for `debug`, in addition
1373 to `true` and `false`. These are passed to `rustc` as the value to
1374 `-C debuginfo`][cargo/3534]
1375 * [Implement `cargo --version --verbose`][cargo/3604]
1376 * [All builds now output 'dep-info' build dependencies compatible with
1377 make and ninja][cargo/3557]
1378 * [Build all workspace members with `build --all`][cargo/3511]
1379 * [Document all workspace members with `doc --all`][cargo/3515]
1380 * [Path deps outside workspace are not members][cargo/3443]
1385 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
1386 the path to the Rust implementation][38589]
1387 * [The `armv7-linux-androideabi` target no longer enables NEON
1388 extensions, per Google's ABI guide][38413]
1389 * [The stock standard library can be compiled for Redox OS][38401]
1390 * [Rust has initial SPARC support][38726]. Tier 3. No builds
1392 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
1394 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
1399 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1400 match patterns][38069]
1401 * In this release, references to uninhabited types can not be
1402 pattern-matched. This was accidentally allowed in 1.15.
1403 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1404 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1406 * [Clean up semantics of `self` in an import list][38313]
1407 * Reimplemented lifetime elision. This change was almost entirely compatible
1408 with existing code, but it did close a number of small bugs and loopholes,
1409 as well as being more accepting in some other [cases][41105].
1411 [37057]: https://github.com/rust-lang/rust/pull/37057
1412 [37761]: https://github.com/rust-lang/rust/pull/37761
1413 [38006]: https://github.com/rust-lang/rust/pull/38006
1414 [38051]: https://github.com/rust-lang/rust/pull/38051
1415 [38062]: https://github.com/rust-lang/rust/pull/38062
1416 [38062]: https://github.com/rust-lang/rust/pull/38622
1417 [38066]: https://github.com/rust-lang/rust/pull/38066
1418 [38069]: https://github.com/rust-lang/rust/pull/38069
1419 [38131]: https://github.com/rust-lang/rust/pull/38131
1420 [38154]: https://github.com/rust-lang/rust/pull/38154
1421 [38274]: https://github.com/rust-lang/rust/pull/38274
1422 [38304]: https://github.com/rust-lang/rust/pull/38304
1423 [38313]: https://github.com/rust-lang/rust/pull/38313
1424 [38314]: https://github.com/rust-lang/rust/pull/38314
1425 [38327]: https://github.com/rust-lang/rust/pull/38327
1426 [38401]: https://github.com/rust-lang/rust/pull/38401
1427 [38413]: https://github.com/rust-lang/rust/pull/38413
1428 [38469]: https://github.com/rust-lang/rust/pull/38469
1429 [38559]: https://github.com/rust-lang/rust/pull/38559
1430 [38571]: https://github.com/rust-lang/rust/pull/38571
1431 [38580]: https://github.com/rust-lang/rust/pull/38580
1432 [38589]: https://github.com/rust-lang/rust/pull/38589
1433 [38670]: https://github.com/rust-lang/rust/pull/38670
1434 [38712]: https://github.com/rust-lang/rust/pull/38712
1435 [38726]: https://github.com/rust-lang/rust/pull/38726
1436 [38781]: https://github.com/rust-lang/rust/pull/38781
1437 [38798]: https://github.com/rust-lang/rust/pull/38798
1438 [38909]: https://github.com/rust-lang/rust/pull/38909
1439 [38920]: https://github.com/rust-lang/rust/pull/38920
1440 [38927]: https://github.com/rust-lang/rust/pull/38927
1441 [39048]: https://github.com/rust-lang/rust/pull/39048
1442 [39282]: https://github.com/rust-lang/rust/pull/39282
1443 [39379]: https://github.com/rust-lang/rust/pull/39379
1444 [41105]: https://github.com/rust-lang/rust/issues/41105
1445 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1446 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1447 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
1448 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
1449 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
1450 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
1451 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
1452 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
1453 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
1454 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
1455 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
1456 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
1457 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
1458 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
1459 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
1460 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
1461 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
1462 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
1463 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
1464 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
1465 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
1466 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
1467 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
1468 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
1469 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
1470 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
1471 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
1472 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
1473 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
1474 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1477 Version 1.15.1 (2017-02-09)
1478 ===========================
1480 * [Fix IntoIter::as_mut_slice's signature][39466]
1481 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
1483 [39466]: https://github.com/rust-lang/rust/pull/39466
1484 [39523]: https://github.com/rust-lang/rust/pull/39523
1487 Version 1.15.0 (2017-02-02)
1488 ===========================
1493 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
1494 stable. This allows popular code-generating crates like Serde and Diesel to
1495 work ergonomically. [RFC 1681].
1496 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
1497 with curly braces][36868]. Part of [RFC 1506].
1498 * [A number of minor changes to name resolution have been activated][37127].
1499 They add up to more consistent semantics, allowing for future evolution of
1500 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1501 details of what is different. The breaking changes here have been transitioned
1502 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1503 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
1505 * [`?Sized` can be used in `where` clauses][37791]
1506 * [There is now a limit on the size of monomorphized types and it can be
1507 modified with the `#![type_size_limit]` crate attribute, similarly to
1508 the `#![recursion_limit]` attribute][37789]
1513 * [On Windows, the compiler will apply dllimport attributes when linking to
1514 extern functions][37973]. Additional attributes and flags can control which
1515 library kind is linked and its name. [RFC 1717].
1516 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1517 * [The `--test` flag works with procedural macro crates][38107]
1518 * [Fix `extern "aapcs" fn` ABI][37814]
1519 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
1520 * [The `format!` expander recognizes incorrect `printf` and shell-style
1521 formatting directives and suggests the correct format][37613].
1522 * [Only report one error for all unused imports in an import list][37456]
1524 Compiler Performance
1525 --------------------
1527 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
1528 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
1529 * [Don't clone in `UnificationTable::probe`][37848]
1530 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
1531 * [Use small vectors in type walker][37760]
1532 * [Macro expansion performance was improved][37701]
1533 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
1534 * [Replace FNV with a faster hash function][37229]
1539 * [`std::iter::Iterator::min_by`]
1540 * [`std::iter::Iterator::max_by`]
1541 * [`std::os::*::fs::FileExt`]
1542 * [`std::sync::atomic::Atomic*::get_mut`]
1543 * [`std::sync::atomic::Atomic*::into_inner`]
1544 * [`std::vec::IntoIter::as_slice`]
1545 * [`std::vec::IntoIter::as_mut_slice`]
1546 * [`std::sync::mpsc::Receiver::try_iter`]
1547 * [`std::os::unix::process::CommandExt::before_exec`]
1548 * [`std::rc::Rc::strong_count`]
1549 * [`std::rc::Rc::weak_count`]
1550 * [`std::sync::Arc::strong_count`]
1551 * [`std::sync::Arc::weak_count`]
1552 * [`std::char::encode_utf8`]
1553 * [`std::char::encode_utf16`]
1554 * [`std::cell::Ref::clone`]
1555 * [`std::io::Take::into_inner`]
1560 * [The standard sorting algorithm has been rewritten for dramatic performance
1561 improvements][38192]. It is a hybrid merge sort, drawing influences from
1562 Timsort. Previously it was a naive merge sort.
1563 * [`Iterator::nth` no longer has a `Sized` bound][38134]
1564 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
1566 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
1567 and `char_indices().last()`][37882]
1568 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
1569 * [Chinese characters display correctly in `fmt::Debug`][37855]
1570 * [Derive `Default` for `Duration`][37699]
1571 * [Support creation of anonymous pipes on WinXP/2k][37677]
1572 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
1573 * [Don't pass overlapped handles to processes][38835]
1578 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1579 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1580 should instead check the variable at runtime with `std::env`. That the value
1581 was set at build time was a bug, and incorrect when cross-compiling. This
1582 change is known to cause breakage.
1583 * [Add `--all` flag to `cargo test`][cargo/3221]
1584 * [Compile statically against the MSVC CRT][cargo/3363]
1585 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
1586 * [Link OpenSSL statically on OSX][cargo/3311]
1587 * [Apply new fingerprinting to build dir outputs][cargo/3310]
1588 * [Test for bad path overrides with summaries][cargo/3336]
1589 * [Require `cargo install --vers` to take a semver version][cargo/3338]
1590 * [Fix retrying crate downloads for network errors][cargo/3348]
1591 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
1592 * [Emit more info on --message-format=json][cargo/3319]
1593 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
1594 * [Don't ignore errors in workspace manifest][cargo/3409]
1595 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
1600 * [Test runners (binaries built with `--test`) now support a `--list` argument
1601 that lists the tests it contains][38185]
1602 * [Test runners now support a `--exact` argument that makes the test filter
1603 match exactly, instead of matching only a substring of the test name][38181]
1604 * [rustdoc supports a `--playground-url` flag][37763]
1605 * [rustdoc provides more details about `#[should_panic]` errors][37749]
1610 * [The Rust build system is now written in Rust][37817]. The Makefiles may
1611 continue to be used in this release by passing `--disable-rustbuild` to the
1612 configure script, but they will be deleted soon. Note that the new build
1613 system uses a different on-disk layout that will likely affect any scripts
1615 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
1617 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
1618 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
1624 * [A number of minor changes to name resolution have been activated][37127].
1625 They add up to more consistent semantics, allowing for future evolution of
1626 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1627 details of what is different. The breaking changes here have been transitioned
1628 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1629 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1630 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1631 should instead check the variable at runtime with `std::env`. That the value
1632 was set at build time was a bug, and incorrect when cross-compiling. This
1633 change is known to cause breakage.
1634 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
1635 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
1636 1.10 and is now an error by default. It will become a hard error in the near
1638 * [The semantics relating modules to file system directories are changing in
1639 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
1640 lint, which is a warning in this release, and will become a hard error in the
1642 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1643 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
1644 the underlying iterator][37834]
1646 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
1647 [33685]: https://github.com/rust-lang/rust/issues/33685
1648 [36868]: https://github.com/rust-lang/rust/pull/36868
1649 [37127]: https://github.com/rust-lang/rust/pull/37127
1650 [37229]: https://github.com/rust-lang/rust/pull/37229
1651 [37456]: https://github.com/rust-lang/rust/pull/37456
1652 [37527]: https://github.com/rust-lang/rust/pull/37527
1653 [37602]: https://github.com/rust-lang/rust/pull/37602
1654 [37613]: https://github.com/rust-lang/rust/pull/37613
1655 [37615]: https://github.com/rust-lang/rust/pull/37615
1656 [37636]: https://github.com/rust-lang/rust/pull/37636
1657 [37627]: https://github.com/rust-lang/rust/pull/37627
1658 [37642]: https://github.com/rust-lang/rust/pull/37642
1659 [37677]: https://github.com/rust-lang/rust/pull/37677
1660 [37699]: https://github.com/rust-lang/rust/pull/37699
1661 [37701]: https://github.com/rust-lang/rust/pull/37701
1662 [37705]: https://github.com/rust-lang/rust/pull/37705
1663 [37749]: https://github.com/rust-lang/rust/pull/37749
1664 [37760]: https://github.com/rust-lang/rust/pull/37760
1665 [37763]: https://github.com/rust-lang/rust/pull/37763
1666 [37764]: https://github.com/rust-lang/rust/pull/37764
1667 [37789]: https://github.com/rust-lang/rust/pull/37789
1668 [37791]: https://github.com/rust-lang/rust/pull/37791
1669 [37814]: https://github.com/rust-lang/rust/pull/37814
1670 [37817]: https://github.com/rust-lang/rust/pull/37817
1671 [37834]: https://github.com/rust-lang/rust/pull/37834
1672 [37848]: https://github.com/rust-lang/rust/pull/37848
1673 [37855]: https://github.com/rust-lang/rust/pull/37855
1674 [37882]: https://github.com/rust-lang/rust/pull/37882
1675 [37888]: https://github.com/rust-lang/rust/pull/37888
1676 [37973]: https://github.com/rust-lang/rust/pull/37973
1677 [37979]: https://github.com/rust-lang/rust/pull/37979
1678 [38086]: https://github.com/rust-lang/rust/pull/38086
1679 [38107]: https://github.com/rust-lang/rust/pull/38107
1680 [38117]: https://github.com/rust-lang/rust/pull/38117
1681 [38134]: https://github.com/rust-lang/rust/pull/38134
1682 [38146]: https://github.com/rust-lang/rust/pull/38146
1683 [38181]: https://github.com/rust-lang/rust/pull/38181
1684 [38182]: https://github.com/rust-lang/rust/pull/38182
1685 [38185]: https://github.com/rust-lang/rust/pull/38185
1686 [38192]: https://github.com/rust-lang/rust/pull/38192
1687 [38279]: https://github.com/rust-lang/rust/pull/38279
1688 [38835]: https://github.com/rust-lang/rust/pull/38835
1689 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1690 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
1691 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
1692 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
1693 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
1694 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
1695 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
1696 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
1697 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
1698 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
1699 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
1700 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
1701 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
1702 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
1703 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
1704 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
1705 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
1706 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
1707 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
1708 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
1709 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
1710 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
1711 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
1712 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
1713 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
1714 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
1715 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
1716 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
1717 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
1718 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
1719 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
1720 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
1721 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
1722 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
1723 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
1724 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
1725 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
1726 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
1729 Version 1.14.0 (2016-12-22)
1730 ===========================
1735 * [`..` matches multiple tuple fields in enum variants, structs
1736 and tuples][36843]. [RFC 1492].
1737 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
1738 * [`use *` and `use ::*` both glob-import from the crate root][37367]
1739 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
1740 dereferencing][36822]
1745 * [Mark enums with non-zero discriminant as non-zero][37224]
1746 * [Lower-case `static mut` names are linted like other
1747 statics and consts][37162]
1748 * [Fix ICE on some macros in const integer positions
1749 (e.g. `[u8; m!()]`)][36819]
1750 * [Improve error message and snippet for "did you mean `x`"][36798]
1751 * [Add a panic-strategy field to the target specification][36794]
1752 * [Include LLVM version in `--version --verbose`][37200]
1754 Compile-time Optimizations
1755 --------------------------
1757 * [Improve macro expansion performance][37569]
1758 * [Shrink `Expr_::ExprInlineAsm`][37445]
1759 * [Replace all uses of SHA-256 with BLAKE2b][37439]
1760 * [Reduce the number of bytes hashed by `IchHasher`][37427]
1761 * [Avoid more allocations when compiling html5ever][37373]
1762 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
1763 * [Avoid some allocations in the macro parser][37318]
1764 * [Use a faster deflate setting][37298]
1765 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
1766 during interning of slices][37270]
1767 * [Optimize `write_metadata`][37267]
1768 * [Don't process obligation forest cycles when stalled][37231]
1769 * [Avoid many `CrateConfig` clones][37161]
1770 * [Optimize `Substs::super_fold_with`][37108]
1771 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
1772 * [Speed up `plug_leaks`][36917]
1777 * [`println!()`, with no arguments, prints newline][36825].
1778 Previously, an empty string was required to achieve the same.
1779 * [`Wrapping` impls standard binary and unary operators, as well as
1780 the `Sum` and `Product` iterators][37356]
1781 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
1783 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
1784 `VecDeque` iterators][37315]
1785 * [Improve `SipHasher` performance on small values][37312]
1786 * [Add Iterator trait TrustedLen to enable better FromIterator /
1788 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
1789 * [`ReadDir` implements `Debug`][37221]
1790 * [Implement `RefUnwindSafe` for atomic types][37178]
1791 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
1792 * [Avoid allocations in `Decoder::read_str`][37064]
1793 * [`io::Error` implements `From<io::ErrorKind>`][37037]
1794 * [Impl `Debug` for raw pointers to unsized data][36880]
1795 * [Don't reuse `HashMap` random seeds][37470]
1796 * [The internal memory layout of `HashMap` is more cache-friendly, for
1797 significant improvements in some operations][36692]
1798 * [`HashMap` uses less memory on 32-bit architectures][36595]
1799 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
1804 * [Expose rustc cfg values to build scripts][cargo/3243]
1805 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
1806 * [Fix passing --features when testing multiple packages][cargo/3280]
1807 * [Use a single profile set per workspace][cargo/3249]
1808 * [Load `replace` sections from lock files][cargo/3220]
1809 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
1814 * [rustup is the recommended Rust installation method][1.14rustup]
1815 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
1816 S390x. These are [tier 2] platforms and may have major defects. Follow the
1817 instructions on the website to install, or add the targets to an existing
1818 installation with `rustup target add`. The new target triples are:
1819 - `mips-unknown-linux-gnu`
1820 - `mipsel-unknown-linux-gnu`
1821 - `mips64-unknown-linux-gnuabi64`
1822 - `mips64el-unknown-linux-gnuabi64 `
1823 - `powerpc-unknown-linux-gnu`
1824 - `powerpc64-unknown-linux-gnu`
1825 - `powerpc64le-unknown-linux-gnu`
1826 - `s390x-unknown-linux-gnu `
1827 * This release includes target (std) builds for ARM Linux running MUSL
1828 libc. These are [tier 2] platforms and may have major defects. Add the
1829 following triples to an existing rustup installation with `rustup target add`:
1830 - `arm-unknown-linux-musleabi`
1831 - `arm-unknown-linux-musleabihf`
1832 - `armv7-unknown-linux-musleabihf`
1833 * This release includes [experimental support for WebAssembly][1.14wasm], via
1834 the `wasm32-unknown-emscripten` target. This target is known to have major
1835 defects. Please test, report, and fix.
1836 * rustup no longer installs documentation by default. Run `rustup
1837 component add rust-docs` to install.
1838 * [Fix line stepping in debugger][37310]
1839 * [Enable line number debuginfo in releases][37280]
1844 * [Disable jemalloc on aarch64/powerpc/mips][37392]
1845 * [Add support for Fuchsia OS][37313]
1846 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
1851 * [A number of forward-compatibility lints used by the compiler
1852 to gradually introduce language changes have been converted
1853 to deny by default][36894]:
1854 - ["use of inaccessible extern crate erroneously allowed"][36886]
1855 - ["type parameter default erroneously allowed in invalid location"][36887]
1856 - ["detects super or self keywords at the beginning of global path"][36888]
1857 - ["two overlapping inherent impls define an item with the same name
1858 were erroneously allowed"][36889]
1859 - ["floating-point constants cannot be used in patterns"][36890]
1860 - ["constants of struct or enum type can only be used in a pattern if
1861 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
1862 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
1863 * [Prohibit patterns in trait methods without bodies][37378]
1864 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
1865 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
1866 * [The `$crate` macro variable is accepted in fewer locations][37213]
1867 * [Impls specifying extra region requirements beyond the trait
1868 they implement are rejected][37167]
1869 * [Enums may not be unsized][37111]. Unsized enums are intended to
1870 work but never have. For now they are forbidden.
1871 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
1873 [tier 2]: https://forge.rust-lang.org/platform-support.html
1874 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
1875 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
1876 [36430]: https://github.com/rust-lang/rust/pull/36430
1877 [36595]: https://github.com/rust-lang/rust/pull/36595
1878 [36595]: https://github.com/rust-lang/rust/pull/36595
1879 [36692]: https://github.com/rust-lang/rust/pull/36692
1880 [36767]: https://github.com/rust-lang/rust/pull/36767
1881 [36794]: https://github.com/rust-lang/rust/pull/36794
1882 [36798]: https://github.com/rust-lang/rust/pull/36798
1883 [36819]: https://github.com/rust-lang/rust/pull/36819
1884 [36822]: https://github.com/rust-lang/rust/pull/36822
1885 [36825]: https://github.com/rust-lang/rust/pull/36825
1886 [36843]: https://github.com/rust-lang/rust/pull/36843
1887 [36880]: https://github.com/rust-lang/rust/pull/36880
1888 [36886]: https://github.com/rust-lang/rust/issues/36886
1889 [36887]: https://github.com/rust-lang/rust/issues/36887
1890 [36888]: https://github.com/rust-lang/rust/issues/36888
1891 [36889]: https://github.com/rust-lang/rust/issues/36889
1892 [36890]: https://github.com/rust-lang/rust/issues/36890
1893 [36891]: https://github.com/rust-lang/rust/issues/36891
1894 [36892]: https://github.com/rust-lang/rust/issues/36892
1895 [36894]: https://github.com/rust-lang/rust/pull/36894
1896 [36917]: https://github.com/rust-lang/rust/pull/36917
1897 [36993]: https://github.com/rust-lang/rust/pull/36993
1898 [37037]: https://github.com/rust-lang/rust/pull/37037
1899 [37064]: https://github.com/rust-lang/rust/pull/37064
1900 [37094]: https://github.com/rust-lang/rust/pull/37094
1901 [37108]: https://github.com/rust-lang/rust/pull/37108
1902 [37111]: https://github.com/rust-lang/rust/pull/37111
1903 [37161]: https://github.com/rust-lang/rust/pull/37161
1904 [37162]: https://github.com/rust-lang/rust/pull/37162
1905 [37167]: https://github.com/rust-lang/rust/pull/37167
1906 [37178]: https://github.com/rust-lang/rust/pull/37178
1907 [37200]: https://github.com/rust-lang/rust/pull/37200
1908 [37213]: https://github.com/rust-lang/rust/pull/37213
1909 [37221]: https://github.com/rust-lang/rust/pull/37221
1910 [37224]: https://github.com/rust-lang/rust/pull/37224
1911 [37230]: https://github.com/rust-lang/rust/pull/37230
1912 [37231]: https://github.com/rust-lang/rust/pull/37231
1913 [37247]: https://github.com/rust-lang/rust/pull/37247
1914 [37267]: https://github.com/rust-lang/rust/pull/37267
1915 [37270]: https://github.com/rust-lang/rust/pull/37270
1916 [37273]: https://github.com/rust-lang/rust/pull/37273
1917 [37280]: https://github.com/rust-lang/rust/pull/37280
1918 [37298]: https://github.com/rust-lang/rust/pull/37298
1919 [37306]: https://github.com/rust-lang/rust/pull/37306
1920 [37310]: https://github.com/rust-lang/rust/pull/37310
1921 [37312]: https://github.com/rust-lang/rust/pull/37312
1922 [37313]: https://github.com/rust-lang/rust/pull/37313
1923 [37315]: https://github.com/rust-lang/rust/pull/37315
1924 [37318]: https://github.com/rust-lang/rust/pull/37318
1925 [37322]: https://github.com/rust-lang/rust/pull/37322
1926 [37326]: https://github.com/rust-lang/rust/pull/37326
1927 [37351]: https://github.com/rust-lang/rust/pull/37351
1928 [37356]: https://github.com/rust-lang/rust/pull/37356
1929 [37367]: https://github.com/rust-lang/rust/pull/37367
1930 [37373]: https://github.com/rust-lang/rust/pull/37373
1931 [37378]: https://github.com/rust-lang/rust/pull/37378
1932 [37389]: https://github.com/rust-lang/rust/pull/37389
1933 [37392]: https://github.com/rust-lang/rust/pull/37392
1934 [37427]: https://github.com/rust-lang/rust/pull/37427
1935 [37439]: https://github.com/rust-lang/rust/pull/37439
1936 [37445]: https://github.com/rust-lang/rust/pull/37445
1937 [37470]: https://github.com/rust-lang/rust/pull/37470
1938 [37569]: https://github.com/rust-lang/rust/pull/37569
1939 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1940 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
1941 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
1942 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
1943 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
1944 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
1945 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
1948 Version 1.13.0 (2016-11-10)
1949 ===========================
1954 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
1955 errors, like the `try!` macro, described in [RFC 0243].
1956 * [Stabilize macros in type position][36014]. Described in [RFC 873].
1957 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
1958 * [Fix `#[derive]` for empty tuple structs/variants][35728]
1959 * [Fix lifetime rules for 'if' conditions][36029]
1960 * [Avoid loading and parsing unconfigured non-inline modules][36482]
1965 * [Add the `-C link-arg` argument][36574]
1966 * [Remove the old AST-based backend from rustc_trans][35764]
1967 * [Don't enable NEON by default on armv7 Linux][35814]
1968 * [Fix debug line number info for macro expansions][35238]
1969 * [Do not emit "class method" debuginfo for types that are not
1970 DICompositeType][36008]
1971 * [Warn about multiple conflicting #[repr] hints][34623]
1972 * [When sizing DST, don't double-count nested struct prefixes][36351]
1973 * [Default RUST_MIN_STACK to 16MiB for now][36505]
1974 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
1975 * [Reject macros with empty repetitions to avoid infinite loop][36721]
1976 * [Expand macros without recursing to avoid stack overflows][36214]
1981 * [Replace macro backtraces with labeled local uses][35702]
1982 * [Improve error message for misplaced doc comments][33922]
1983 * [Buffer unix and lock windows to prevent message interleaving][35975]
1984 * [Update lifetime errors to specifically note temporaries][36171]
1985 * [Special case a few colors for Windows][36178]
1986 * [Suggest `use self` when such an import resolves][36289]
1987 * [Be more specific when type parameter shadows primitive type][36338]
1988 * Many minor improvements
1990 Compile-time Optimizations
1991 --------------------------
1993 * [Compute and cache HIR hashes at beginning][35854]
1994 * [Don't hash types in loan paths][36004]
1995 * [Cache projections in trans][35761]
1996 * [Optimize the parser's last token handling][36527]
1997 * [Only instantiate #[inline] functions in codegen units referencing
1998 them][36524]. This leads to big improvements in cases where crates export
1999 define many inline functions without using them directly.
2000 * [Lazily allocate TypedArena's first chunk][36592]
2001 * [Don't allocate during default HashSet creation][36734]
2008 * [`overflowing_abs`]
2009 * [`RefCell::try_borrow`]
2010 * [`RefCell::try_borrow_mut`]
2015 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2016 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2018 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2019 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2020 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2021 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2022 * [Use arc4rand on FreeBSD][35884]
2023 * [memrchr: Correct aligned offset computation][35969]
2024 * [Improve Demangling of Rust Symbols][36059]
2025 * [Use monotonic time in condition variables][35048]
2026 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2027 * [Implement conversion traits for `char`][35755]
2028 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2029 * [Zero first byte of CString on drop][36264]
2030 * [Inherit overflow checks for sum and product][36372]
2031 * [Add missing Eq implementations][36423]
2032 * [Implement `Debug` for `DirEntry`][36631]
2033 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2035 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2036 * [Implement more traits for `std::io::ErrorKind`][35911]
2037 * [Optimize BinaryHeap bounds checking][36072]
2038 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2039 `extend_with_element`][36355]
2040 * [Fix overflow checking in unsigned pow()][34942]
2045 * This release includes security fixes to both curl and OpenSSL.
2046 * [Fix transitive doctests when panic=abort][cargo/3021]
2047 * [Add --all-features flag to cargo][cargo/3038]
2048 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2049 * [Don't parse the home directory more than once][cargo/3078]
2050 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2051 * [Update OpenSSL to 1.0.2j][cargo/3121]
2052 * [Add license and license_file to cargo metadata output][cargo/3110]
2053 * [Make crates-io registry URL optional in config; ignore all changes to
2054 source.crates-io][cargo/3089]
2055 * [Don't download dependencies from other platforms][cargo/3123]
2056 * [Build transitive dev-dependencies when needed][cargo/3125]
2057 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2058 * [Avoid updating registry when adding existing deps][cargo/3144]
2059 * [Warn about path overrides that won't work][cargo/3136]
2060 * [Use workspaces during `cargo install`][cargo/3146]
2061 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2062 * [Add --message-format flag][cargo/3000]
2063 * [Pass target environment for rustdoc][cargo/3205]
2064 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2065 * [Update curl and curl-sys][cargo/3241]
2066 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2071 * [rustdoc: Add the `--sysroot` argument][36586]
2072 * [rustdoc: Fix a couple of issues with the search results][35655]
2073 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2074 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2075 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2080 * [Remove unmaintained style guide][35124]
2081 * [Add s390x support][36369]
2082 * [Initial work at Haiku OS support][36727]
2083 * [Add mips-uclibc targets][35734]
2084 * [Crate-ify compiler-rt into compiler-builtins][35021]
2085 * [Add rustc version info (git hash + date) to dist tarball][36213]
2086 * Many documentation improvements
2091 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2092 * [Deny (by default) transmuting from fn item types to pointer-sized
2093 types][34923]. Continuing the long transition to zero-sized fn items,
2095 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2097 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2098 * [Fix lifetime rules for 'if' conditions][36029].
2099 * [Inherit overflow checks for sum and product][36372].
2100 * [Forbid user-defined macros named "macro_rules"][36730].
2102 [33922]: https://github.com/rust-lang/rust/pull/33922
2103 [34623]: https://github.com/rust-lang/rust/pull/34623
2104 [34923]: https://github.com/rust-lang/rust/pull/34923
2105 [34942]: https://github.com/rust-lang/rust/pull/34942
2106 [34982]: https://github.com/rust-lang/rust/pull/34982
2107 [35021]: https://github.com/rust-lang/rust/pull/35021
2108 [35048]: https://github.com/rust-lang/rust/pull/35048
2109 [35074]: https://github.com/rust-lang/rust/pull/35074
2110 [35124]: https://github.com/rust-lang/rust/pull/35124
2111 [35234]: https://github.com/rust-lang/rust/pull/35234
2112 [35238]: https://github.com/rust-lang/rust/pull/35238
2113 [35354]: https://github.com/rust-lang/rust/pull/35354
2114 [35559]: https://github.com/rust-lang/rust/pull/35559
2115 [35585]: https://github.com/rust-lang/rust/pull/35585
2116 [35627]: https://github.com/rust-lang/rust/pull/35627
2117 [35655]: https://github.com/rust-lang/rust/pull/35655
2118 [35702]: https://github.com/rust-lang/rust/pull/35702
2119 [35707]: https://github.com/rust-lang/rust/pull/35707
2120 [35728]: https://github.com/rust-lang/rust/pull/35728
2121 [35734]: https://github.com/rust-lang/rust/pull/35734
2122 [35755]: https://github.com/rust-lang/rust/pull/35755
2123 [35761]: https://github.com/rust-lang/rust/pull/35761
2124 [35764]: https://github.com/rust-lang/rust/pull/35764
2125 [35814]: https://github.com/rust-lang/rust/pull/35814
2126 [35854]: https://github.com/rust-lang/rust/pull/35854
2127 [35871]: https://github.com/rust-lang/rust/pull/35871
2128 [35884]: https://github.com/rust-lang/rust/pull/35884
2129 [35911]: https://github.com/rust-lang/rust/pull/35911
2130 [35969]: https://github.com/rust-lang/rust/pull/35969
2131 [35975]: https://github.com/rust-lang/rust/pull/35975
2132 [36004]: https://github.com/rust-lang/rust/pull/36004
2133 [36008]: https://github.com/rust-lang/rust/pull/36008
2134 [36014]: https://github.com/rust-lang/rust/pull/36014
2135 [36029]: https://github.com/rust-lang/rust/pull/36029
2136 [36059]: https://github.com/rust-lang/rust/pull/36059
2137 [36072]: https://github.com/rust-lang/rust/pull/36072
2138 [36101]: https://github.com/rust-lang/rust/pull/36101
2139 [36104]: https://github.com/rust-lang/rust/pull/36104
2140 [36171]: https://github.com/rust-lang/rust/pull/36171
2141 [36173]: https://github.com/rust-lang/rust/pull/36173
2142 [36178]: https://github.com/rust-lang/rust/pull/36178
2143 [36213]: https://github.com/rust-lang/rust/pull/36213
2144 [36214]: https://github.com/rust-lang/rust/pull/36214
2145 [36264]: https://github.com/rust-lang/rust/pull/36264
2146 [36266]: https://github.com/rust-lang/rust/pull/36266
2147 [36289]: https://github.com/rust-lang/rust/pull/36289
2148 [36338]: https://github.com/rust-lang/rust/pull/36338
2149 [36351]: https://github.com/rust-lang/rust/pull/36351
2150 [36355]: https://github.com/rust-lang/rust/pull/36355
2151 [36369]: https://github.com/rust-lang/rust/pull/36369
2152 [36372]: https://github.com/rust-lang/rust/pull/36372
2153 [36423]: https://github.com/rust-lang/rust/pull/36423
2154 [36482]: https://github.com/rust-lang/rust/pull/36482
2155 [36505]: https://github.com/rust-lang/rust/pull/36505
2156 [36524]: https://github.com/rust-lang/rust/pull/36524
2157 [36527]: https://github.com/rust-lang/rust/pull/36527
2158 [36551]: https://github.com/rust-lang/rust/pull/36551
2159 [36574]: https://github.com/rust-lang/rust/pull/36574
2160 [36586]: https://github.com/rust-lang/rust/pull/36586
2161 [36592]: https://github.com/rust-lang/rust/pull/36592
2162 [36631]: https://github.com/rust-lang/rust/pull/36631
2163 [36639]: https://github.com/rust-lang/rust/pull/36639
2164 [36721]: https://github.com/rust-lang/rust/pull/36721
2165 [36727]: https://github.com/rust-lang/rust/pull/36727
2166 [36730]: https://github.com/rust-lang/rust/pull/36730
2167 [36734]: https://github.com/rust-lang/rust/pull/36734
2168 [36754]: https://github.com/rust-lang/rust/pull/36754
2169 [36995]: https://github.com/rust-lang/rust/pull/36995
2170 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2171 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2172 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2173 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2174 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2175 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2176 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2177 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2178 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2179 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2180 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2181 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2182 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2183 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2184 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2185 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2186 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2187 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2188 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
2189 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
2190 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
2191 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
2192 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
2193 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
2194 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
2195 [rustup]: https://www.rustup.rs
2196 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
2197 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
2198 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
2199 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
2200 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
2201 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
2202 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
2205 Version 1.12.1 (2016-10-20)
2206 ===========================
2211 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
2212 * [Confusion with double negation and booleans][36856]
2213 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
2214 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
2215 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
2216 * [Corrupted memory after updated to 1.12][36936]
2217 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
2218 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
2219 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
2221 [36381]: https://github.com/rust-lang/rust/issues/36381
2222 [36856]: https://github.com/rust-lang/rust/issues/36856
2223 [36875]: https://github.com/rust-lang/rust/issues/36875
2224 [36924]: https://github.com/rust-lang/rust/issues/36924
2225 [36926]: https://github.com/rust-lang/rust/issues/36926
2226 [36936]: https://github.com/rust-lang/rust/issues/36936
2227 [37026]: https://github.com/rust-lang/rust/issues/37026
2228 [37112]: https://github.com/rust-lang/rust/issues/37112
2229 [37153]: https://github.com/rust-lang/rust/issues/37153
2232 Version 1.12.0 (2016-09-29)
2233 ===========================
2238 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2239 This translation pass is far simpler than the previous AST->LLVM pass, and
2240 creates opportunities to perform new optimizations directly on the MIR. It
2241 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2242 * [`rustc` presents a new, more readable error format, along with
2243 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2244 Most common editors supporting Rust have been updated to work with it. It was
2245 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2250 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2251 This translation pass is far simpler than the previous AST->LLVM pass, and
2252 creates opportunities to perform new optimizations directly on the MIR. It
2253 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2254 * [Print the Rust target name, not the LLVM target name, with
2255 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
2256 * [The computation of `TypeId` is correct in some cases where it was previously
2257 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
2258 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
2259 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
2260 `--print relocation-models`, and `--print code-models` print the available
2261 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
2262 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
2263 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
2264 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
2265 These targets produce statically-linked binaries. There are no binary release
2271 * [`rustc` presents a new, more readable error format, along with
2272 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2273 Most common editors supporting Rust have been updated to work with it. It was
2274 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2275 * [In error descriptions, references are now described in plain English,
2276 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
2277 * [In error type descriptions, unknown numeric types are named `{integer}` or
2278 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
2279 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
2284 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
2285 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
2286 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
2287 useful](https://github.com/rust-lang/rust/pull/34908)
2288 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
2289 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
2290 * [Semicolons are properly required as statement delimiters inside
2291 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
2292 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2297 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
2298 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
2299 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
2300 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
2301 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
2302 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
2303 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
2304 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
2305 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
2306 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
2307 Both on Unix and Windows.
2308 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
2309 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
2310 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
2311 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
2312 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
2313 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
2314 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
2315 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
2320 * [The `format!` macro and friends now allow a single argument to be formatted
2321 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
2322 * [The lifetime bounds on `[T]::binary_search_by` and
2323 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
2324 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
2325 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
2326 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
2327 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
2328 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
2329 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
2330 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
2331 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
2332 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
2333 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
2334 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
2335 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
2336 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
2337 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
2338 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
2339 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
2340 * [`mpsc::sync_channel` `Receiver`s return any available message before
2341 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
2342 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
2343 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
2348 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
2349 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
2350 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
2351 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
2352 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
2353 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
2354 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
2355 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
2356 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
2357 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
2358 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
2359 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
2360 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
2361 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
2362 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
2363 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
2368 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
2369 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
2374 * [Test binaries now support a `--test-threads` argument to specify the number
2375 of threads used to run tests, and which acts the same as the
2376 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
2377 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
2378 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
2379 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2380 * [Rust releases now come with source packages that can be installed by rustup
2381 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
2382 The resulting source code can be used by tools and IDES, located in the
2383 sysroot under `lib/rustlib/src`.
2388 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
2389 * Many minor improvements to the documentation.
2390 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
2395 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
2396 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
2397 * [When formatting strings, if "precision" is specified, the "fill",
2398 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
2399 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
2402 Version 1.11.0 (2016-08-18)
2403 ===========================
2408 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2409 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
2410 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
2411 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
2412 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
2417 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
2418 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
2419 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
2420 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
2421 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
2422 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
2423 (in libcore - previously stabilized in libstd)
2424 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
2425 (in libcore - previously stabilized in libstd)
2426 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
2427 (in libcore - previously stabilized in libstd)
2428 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
2429 (in libcore - previously stabilized in libstd)
2430 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2431 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2432 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
2433 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
2438 * [The `thread_local!` macro supports multiple definitions in a single
2439 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
2440 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
2441 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
2442 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
2443 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
2444 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
2445 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
2446 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
2451 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
2452 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
2453 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
2454 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
2455 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
2456 and `-vv` prints warnings for all crates.
2457 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
2458 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
2459 This provides room for expansion by arbitrary tools.
2460 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
2461 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
2462 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
2463 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
2464 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
2465 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
2466 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
2471 * [Caching projections speeds up type check dramatically for some
2472 workloads](https://github.com/rust-lang/rust/pull/33816)
2473 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
2474 This hasher is faster, but is believed to provide sufficient
2475 protection from collision attacks.
2476 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
2481 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
2482 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
2483 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
2484 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
2485 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
2490 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
2491 * [When emitting debug info, rustc emits frame pointers for closures,
2492 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
2493 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2494 * Many more errors have been given error codes and extended
2496 * API documentation continues to be improved, with many new examples
2501 * [rustc no longer hangs when dependencies recursively re-export
2502 submodules](https://github.com/rust-lang/rust/pull/34542)
2503 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
2504 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
2505 rewritten](https://github.com/rust-lang/rust/pull/33895)
2506 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
2507 No targets use this yet, but it works toward AVR support.
2512 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
2513 * [The new follow-set rules that place restrictions on `macro_rules!`
2514 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
2515 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
2516 and has been a warning since 1.10.
2517 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
2518 This causes breakage in some corner cases.
2521 Version 1.10.0 (2016-07-07)
2522 ===========================
2527 * [Allow `concat_idents!` in type positions as well as in expression
2528 positions](https://github.com/rust-lang/rust/pull/33735).
2529 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
2530 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
2531 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
2532 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
2533 * [`panic!` can be converted to a runtime abort with the
2534 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
2535 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2536 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
2537 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
2538 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-rdylib.md).
2539 Note that Cargo does not yet directly support cdylibs.
2544 * `os::windows::fs::OpenOptionsExt::access_mode`
2545 * `os::windows::fs::OpenOptionsExt::share_mode`
2546 * `os::windows::fs::OpenOptionsExt::custom_flags`
2547 * `os::windows::fs::OpenOptionsExt::attributes`
2548 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
2549 * `os::unix::fs::OpenOptionsExt::custom_flags`
2550 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
2551 * `Default for sync::Weak`
2552 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
2553 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
2554 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
2555 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
2556 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
2557 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
2558 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
2559 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
2560 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
2561 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
2562 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
2563 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
2564 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
2565 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
2566 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
2567 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
2568 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
2569 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
2570 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
2571 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
2572 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
2573 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
2574 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
2575 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
2576 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
2577 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2578 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2579 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2580 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2581 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
2582 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
2583 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
2584 * Read/Write/RawFd impls for `UnixStream`
2585 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
2586 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
2587 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
2588 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
2589 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
2590 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
2591 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
2592 * RawFd impls for `UnixListener`
2593 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
2594 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
2595 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
2596 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
2597 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
2598 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
2599 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
2600 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
2601 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
2602 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
2603 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
2604 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
2605 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
2606 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
2607 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
2608 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
2609 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
2610 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
2611 * RawFd impls for `UnixDatagram`
2612 * `{BTree,Hash}Map::values_mut`
2613 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
2618 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
2619 The semantics of this minor method are subtle and probably not what
2621 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
2622 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
2623 will fall back to `/dev/urandom` temporarily to avoid blocking
2624 during early boot](https://github.com/rust-lang/rust/pull/33086).
2625 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
2626 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
2627 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
2628 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
2629 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
2630 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
2631 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
2635 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
2636 This controls the runtime behavior of the `panic!` macro
2637 and can be either "unwind" (the default), or "abort".
2638 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2639 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
2640 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
2641 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
2642 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
2643 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
2644 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
2645 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
2646 By default they are retried twice, which can be customized with the
2647 `net.retry` value in `.cargo/config`.
2648 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
2649 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
2650 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
2651 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
2652 Makes it possible to install multiple crates in parallel.
2653 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
2654 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
2655 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
2656 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
2657 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
2658 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
2663 * [rustc memory usage was reduced by refactoring the context used for
2664 type checking](https://github.com/rust-lang/rust/pull/33425).
2665 * [Speed up creation of `HashMap`s by caching the random keys used
2666 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
2667 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
2668 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
2669 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
2670 10x faster than the previous lookup tables.
2671 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
2676 * Many incremental improvements to documentation and rustdoc.
2677 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
2678 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
2679 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
2680 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
2681 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
2682 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
2683 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
2688 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
2689 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
2690 * [`std` no longer prints backtraces on platforms where the running
2691 module must be loaded with `env::current_exe`, which can't be relied
2692 on](https://github.com/rust-lang/rust/pull/33554).
2693 * This release includes std binaries for the i586-unknown-linux-gnu,
2694 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
2695 i586 target is for old x86 hardware without SSE2, and the armv7
2696 target is for Android running on modern ARM architectures.
2697 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
2698 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
2699 * [On Unix the runtime aborts by calling `libc::abort` instead of
2700 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
2701 * [Rust is now bootstrapped from the previous release of Rust,
2702 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
2707 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
2708 * [`target_env` for Linux ARM targets is just `gnu`, not
2709 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
2710 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
2711 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
2712 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
2713 Affects how macros are parsed.
2714 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
2715 * [Feature-gated attributes on macro-generated macro invocations are
2716 now rejected](https://github.com/rust-lang/rust/pull/32791).
2717 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
2718 This caused some minor changes to type inference.
2721 Version 1.9.0 (2016-05-26)
2722 ==========================
2727 * The `#[deprecated]` attribute when applied to an API will generate
2728 warnings when used. The warnings may be suppressed with
2729 `#[allow(deprecated)]`. [RFC 1270].
2730 * [`fn` item types are zero sized, and each `fn` names a unique
2731 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2732 `transmute` on a `fn` type will generate a warning for a few cycles,
2733 then will be converted to an error.
2734 * [Field and method resolution understand visibility, so private
2735 fields and methods cannot prevent the proper use of public fields
2736 and methods][1.9fv].
2737 * [The parser considers unicode codepoints in the
2738 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
2744 * [`std::panic::catch_unwind`][] (renamed from `recover`)
2745 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
2746 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
2747 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
2748 * [`str::is_char_boundary`]
2749 * [`<*const T>::as_ref`]
2750 * [`<*mut T>::as_ref`]
2751 * [`<*mut T>::as_mut`]
2752 * [`AsciiExt::make_ascii_uppercase`]
2753 * [`AsciiExt::make_ascii_lowercase`]
2754 * [`char::decode_utf16`]
2755 * [`char::DecodeUtf16`]
2756 * [`char::DecodeUtf16Error`]
2757 * [`char::DecodeUtf16Error::unpaired_surrogate`]
2758 * [`BTreeSet::take`]
2759 * [`BTreeSet::replace`]
2762 * [`HashSet::replace`]
2764 * [`OsString::with_capacity`]
2765 * [`OsString::clear`]
2766 * [`OsString::capacity`]
2767 * [`OsString::reserve`]
2768 * [`OsString::reserve_exact`]
2769 * [`OsStr::is_empty`]
2771 * [`std::os::unix::thread`]
2774 * [`JoinHandleExt::as_pthread_t`]
2775 * [`JoinHandleExt::into_pthread_t`]
2776 * [`HashSet::hasher`]
2777 * [`HashMap::hasher`]
2778 * [`CommandExt::exec`]
2779 * [`File::try_clone`]
2780 * [`SocketAddr::set_ip`]
2781 * [`SocketAddr::set_port`]
2782 * [`SocketAddrV4::set_ip`]
2783 * [`SocketAddrV4::set_port`]
2784 * [`SocketAddrV6::set_ip`]
2785 * [`SocketAddrV6::set_port`]
2786 * [`SocketAddrV6::set_flowinfo`]
2787 * [`SocketAddrV6::set_scope_id`]
2788 * [`slice::copy_from_slice`]
2789 * [`ptr::read_volatile`]
2790 * [`ptr::write_volatile`]
2791 * [`OpenOptions::create_new`]
2792 * [`TcpStream::set_nodelay`]
2793 * [`TcpStream::nodelay`]
2794 * [`TcpStream::set_ttl`]
2795 * [`TcpStream::ttl`]
2796 * [`TcpStream::set_only_v6`]
2797 * [`TcpStream::only_v6`]
2798 * [`TcpStream::take_error`]
2799 * [`TcpStream::set_nonblocking`]
2800 * [`TcpListener::set_ttl`]
2801 * [`TcpListener::ttl`]
2802 * [`TcpListener::set_only_v6`]
2803 * [`TcpListener::only_v6`]
2804 * [`TcpListener::take_error`]
2805 * [`TcpListener::set_nonblocking`]
2806 * [`UdpSocket::set_broadcast`]
2807 * [`UdpSocket::broadcast`]
2808 * [`UdpSocket::set_multicast_loop_v4`]
2809 * [`UdpSocket::multicast_loop_v4`]
2810 * [`UdpSocket::set_multicast_ttl_v4`]
2811 * [`UdpSocket::multicast_ttl_v4`]
2812 * [`UdpSocket::set_multicast_loop_v6`]
2813 * [`UdpSocket::multicast_loop_v6`]
2814 * [`UdpSocket::set_multicast_ttl_v6`]
2815 * [`UdpSocket::multicast_ttl_v6`]
2816 * [`UdpSocket::set_ttl`]
2817 * [`UdpSocket::ttl`]
2818 * [`UdpSocket::set_only_v6`]
2819 * [`UdpSocket::only_v6`]
2820 * [`UdpSocket::join_multicast_v4`]
2821 * [`UdpSocket::join_multicast_v6`]
2822 * [`UdpSocket::leave_multicast_v4`]
2823 * [`UdpSocket::leave_multicast_v6`]
2824 * [`UdpSocket::take_error`]
2825 * [`UdpSocket::connect`]
2826 * [`UdpSocket::send`]
2827 * [`UdpSocket::recv`]
2828 * [`UdpSocket::set_nonblocking`]
2833 * [`std::sync::Once` is poisoned if its initialization function
2835 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
2836 * [Most types implement `fmt::Debug`][1.9db].
2837 * [The default buffer size used by `BufReader` and `BufWriter` was
2838 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
2839 used by other languages.
2840 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
2841 `Duration` additionally implements `*=` and `/=`][1.9ta].
2842 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
2843 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
2844 * [`Chain` implements `BufRead`][1.9ch].
2845 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
2850 * [Cargo can now run concurrently][1.9cc].
2851 * [Top-level overrides allow specific revisions of crates to be
2852 overridden through the entire crate graph][1.9ct]. This is intended
2853 to make upgrades easier for large projects, by allowing crates to be
2854 forked temporarily until they've been upgraded and republished.
2855 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
2856 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
2857 on the commandline][1.9cf]. `rustc` arguments can also be specified
2858 in the `build.rustflags` configuration key.
2863 * [The time complexity of comparing variables for equivalence during type
2864 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
2865 to major compilation time improvement in some scenarios.
2866 * [`ToString` is specialized for `str`, giving it the same performance
2867 as `to_owned`][1.9ts].
2868 * [Spawning processes with `Command::output` no longer creates extra
2870 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
2871 for C-like enums][1.9cl].
2876 * [Passing the `--quiet` flag to a test runner will produce
2877 much-abbreviated output][1.9q].
2878 * The Rust Project now publishes std binaries for the
2879 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
2880 `i586-pc-windows-msvc` targets.
2885 * [`std::sync::Once` is poisoned if its initialization function
2887 * [It is illegal to define methods with the same name in overlapping
2888 inherent `impl` blocks][1.9sn].
2889 * [`fn` item types are zero sized, and each `fn` names a unique
2890 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2891 `transmute` on a `fn` type will generate a warning for a few cycles,
2892 then will be converted to an error.
2893 * [Improvements to const evaluation may trigger new errors when integer
2894 literals are out of range][1.9ce].
2897 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
2898 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
2899 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
2900 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
2901 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
2902 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
2903 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
2904 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
2905 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
2906 [1.9db]: https://github.com/rust-lang/rust/pull/32054
2907 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
2908 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
2909 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
2910 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
2911 [1.9o]: https://github.com/rust-lang/rust/pull/32325
2912 [1.9q]: https://github.com/rust-lang/rust/pull/31887
2913 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
2914 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
2915 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
2916 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
2917 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
2918 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
2919 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
2920 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
2921 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2922 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
2923 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2924 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
2925 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
2926 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
2927 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
2928 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
2929 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
2930 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
2931 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
2932 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
2933 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
2934 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
2935 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
2936 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
2937 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
2938 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
2939 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
2940 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
2941 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
2942 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
2943 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
2944 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
2945 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
2946 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
2947 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
2948 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
2949 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
2950 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
2951 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
2952 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
2953 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
2954 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
2955 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
2956 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
2957 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2958 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2959 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2960 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2961 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2962 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2963 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
2964 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2965 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
2966 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2967 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2968 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2969 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2970 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2971 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
2972 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
2973 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
2974 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
2975 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
2976 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
2977 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
2978 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
2979 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
2980 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
2981 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
2982 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
2983 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
2984 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
2985 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
2986 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
2987 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
2988 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
2989 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
2990 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
2991 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
2992 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
2993 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
2994 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
2995 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
2996 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
2997 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
2998 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
2999 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3000 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3001 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3002 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3003 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3004 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3005 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3006 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3009 Version 1.8.0 (2016-04-14)
3010 ==========================
3015 * Rust supports overloading of compound assignment statements like
3016 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3017 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3018 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3020 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3021 addition to the non-braced form, `struct Foo;`. [RFC 218].
3027 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3028 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3031 * [`ptr::drop_in_place`]
3033 * [`time::SystemTime`]
3035 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3036 * [`Instant::elapsed`]
3037 * [`SystemTime::now`]
3038 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3039 * [`SystemTime::elapsed`]
3040 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3041 * [`SystemTimeError`]
3042 * [`SystemTimeError::duration`]
3043 * Various impls for `SystemTimeError`
3045 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3046 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3047 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3048 * [The `write!` and `writeln!` macros correctly emit errors if any of
3049 their arguments can't be formatted][1.8w].
3050 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3051 * [The Unix-specific `raw` modules, which contain a number of
3052 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3053 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3054 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3055 across platforms was making it difficult to implement `std`
3056 correctly. Those that need these definitions should use the `libc`
3058 * The Unix-specific `MetadataExt` traits, including
3059 `os::unix::fs::MetadataExt`, which expose values such as inode
3060 numbers [no longer return platform-specific types][1.8r], but
3061 instead return widened integers. [RFC 1415].
3062 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3063 * [Atomic loads and stores are not volatile][1.8a].
3064 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3069 * [Inlining hash functions lead to a 3% compile-time improvement in
3070 some workloads][1.8h].
3071 * When using jemalloc, its symbols are [unprefixed so that it
3072 overrides the libc malloc implementation][1.8h]. This means that for
3073 rustc, LLVM is now using jemalloc, which results in a 6%
3074 compile-time improvement on a specific workload.
3075 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3080 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3081 i686-pc-windows-msvc is now considered a tier-1 platform.
3082 * [The `--print targets` flag prints a list of supported targets][1.8t].
3083 * [The `--print cfg` flag prints the `cfg`s defined for the current
3085 * [`rustc` can be built with an new Cargo-based build system, written
3086 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3087 build system. To enable it configure with `configure --rustbuild`.
3088 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3089 variants while also indicating the total number of missing variants
3090 if more than 3][1.8m].
3091 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3092 * The Rust Project now publishes binary releases of the standard
3093 library for a number of tier-2 targets:
3094 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3095 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3096 `x86_64-rumprun-netbsd`. These can be installed with
3097 tools such as [multirust][1.8mr].
3102 * [`cargo init` creates a new Cargo project in the current
3103 directory][1.8ci]. It is otherwise like `cargo new`.
3104 * [Cargo has configuration keys for `-v` and
3105 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3106 `[term]` section of `.cargo/config`.
3107 * [Configuration keys that evaluate to strings or integers can be set
3108 via environment variables][1.8ce]. For example the `build.jobs` key
3109 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3110 precedence over config files.
3111 * [Target-specific dependencies support Rust `cfg` syntax for
3112 describing targets][1.8cfg] so that dependencies for multiple
3113 targets can be specified together. [RFC 1361].
3114 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3115 `RUSTDOC` take precedence over the `build.target-dir`,
3116 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3117 * [The child process tree is killed on Windows when Cargo is
3119 * [The `build.target` configuration value sets the target platform,
3120 like `--target`][1.8ct].
3125 * [Unstable compiler flags have been further restricted][1.8u]. Since
3126 1.0 `-Z` flags have been considered unstable, and other flags that
3127 were considered unstable additionally required passing `-Z
3128 unstable-options` to access. Unlike unstable language and library
3129 features though, these options have been accessible on the stable
3130 release channel. Going forward, *new unstable flags will not be
3131 available on the stable release channel*, and old unstable flags
3132 will warn about their usage. In the future, all unstable flags will
3133 be unavailable on the stable release channel.
3134 * [It is no longer possible to `match` on empty enum variants using
3135 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3136 * The Unix-specific `MetadataExt` traits, including
3137 `os::unix::fs::MetadataExt`, which expose values such as inode
3138 numbers [no longer return platform-specific types][1.8r], but
3139 instead return widened integers. [RFC 1415].
3140 * [Modules sourced from the filesystem cannot appear within arbitrary
3141 blocks, but only within other modules][1.8mf].
3142 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3143 * On Unix, [stack overflow triggers a runtime abort instead of a
3145 * [`Command::spawn` and its equivalents return an error if any of
3146 its command-line arguments contain interior `NUL`s][1.8n].
3147 * [Tuple and unit enum variants from other crates are in the type
3149 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3150 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3151 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3152 instead of `foo.lib`.
3155 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3156 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3157 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3158 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3159 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3160 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3161 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3162 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3163 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3164 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3165 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3166 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3167 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3168 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3169 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3170 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3171 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3172 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3173 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3174 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3175 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3176 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3177 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3178 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3179 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3180 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3181 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3182 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3183 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3184 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3185 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3186 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3187 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3188 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
3189 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
3190 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
3191 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
3192 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
3193 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
3194 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
3195 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
3196 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
3197 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
3198 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
3199 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
3200 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
3201 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
3202 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
3203 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
3204 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
3205 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
3206 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
3207 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
3208 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
3209 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
3210 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
3211 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
3212 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
3213 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
3214 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
3217 Version 1.7.0 (2016-03-03)
3218 ==========================
3225 * [`Path::strip_prefix`][] (renamed from relative_from)
3226 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
3228 * [`Ipv4Addr::is_loopback`]
3229 * [`Ipv4Addr::is_private`]
3230 * [`Ipv4Addr::is_link_local`]
3231 * [`Ipv4Addr::is_multicast`]
3232 * [`Ipv4Addr::is_broadcast`]
3233 * [`Ipv4Addr::is_documentation`]
3235 * [`Ipv6Addr::is_unspecified`]
3236 * [`Ipv6Addr::is_loopback`]
3237 * [`Ipv6Addr::is_multicast`]
3240 * [`Vec::as_mut_slice`]
3242 * [`String::as_str`]
3243 * [`String::as_mut_str`]
3245 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
3247 * `<[T]>::`[`sort_by_key`]
3248 * checked, saturated, and overflowing operations
3249 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
3250 * [`i32::saturating_mul`]
3251 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
3252 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
3253 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
3254 * [`u32::saturating_mul`]
3255 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
3256 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
3257 * and checked, saturated, and overflowing operations for other primitive types
3259 * [`ffi::IntoStringError`]
3260 * [`CString::into_string`]
3261 * [`CString::into_bytes`]
3262 * [`CString::into_bytes_with_nul`]
3263 * `From<CString> for Vec<u8>`
3265 * [`IntoStringError::into_cstring`]
3266 * [`IntoStringError::utf8_error`]
3267 * `Error for IntoStringError`
3269 * [`std::hash::BuildHasher`]
3270 * [`BuildHasher::Hasher`]
3271 * [`BuildHasher::build_hasher`]
3272 * [`std::hash::BuildHasherDefault`]
3273 * [`HashMap::with_hasher`]
3274 * [`HashMap::with_capacity_and_hasher`]
3275 * [`HashSet::with_hasher`]
3276 * [`HashSet::with_capacity_and_hasher`]
3277 * [`std::collections::hash_map::RandomState`]
3278 * [`RandomState::new`]
3279 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
3280 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
3281 from bytes is faster.
3282 * [The performance of `LineWriter` (and thus `io::stdout`) was
3283 improved by using `memchr` to search for newlines][1.7m].
3284 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
3285 `f64` variants were stabilized previously.
3286 * [`BTreeMap` was rewritten to use less memory and improve the performance
3287 of insertion and iteration, the latter by as much as 5x][1.7bm].
3288 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
3289 covariant over their contained type][1.7bt].
3290 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
3291 over their contained type][1.7ll].
3292 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
3294 * [`Any` is implemented for unsized types][1.7a].
3295 * [`Hash` is implemented for `Duration`][1.7h].
3300 * [When running tests with `--test`, rustdoc will pass `--cfg`
3301 arguments to the compiler][1.7dt].
3302 * [The compiler is built with RPATH information by default][1.7rpa].
3303 This means that it will be possible to run `rustc` when installed in
3304 unusual configurations without configuring the dynamic linker search
3306 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
3307 any RPATH entries (emitted with `-C rpath`) *not* take precedence
3308 over `LD_LIBRARY_PATH`.
3313 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
3314 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
3315 * [The `rerun-if-changed` build script directive no longer causes the
3316 build script to incorrectly run twice in certain scenarios][1.7rr].
3321 * Soundness fixes to the interactions between associated types and
3322 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
3323 code that violates the new rules. This is a significant change that
3324 is known to break existing code, so it has emitted warnings for the
3325 new error cases since 1.4 to give crate authors time to adapt. The
3326 details of what is changing are subtle; read the RFC for more.
3327 * [Several bugs in the compiler's visibility calculations were
3328 fixed][1.7v]. Since this was found to break significant amounts of
3329 code, the new errors will be emitted as warnings for several release
3330 cycles, under the `private_in_public` lint.
3331 * Defaulted type parameters were accidentally accepted in positions
3332 that were not intended. In this release, [defaulted type parameters
3333 appearing outside of type definitions will generate a
3334 warning][1.7d], which will become an error in future releases.
3335 * [Parsing "." as a float results in an error instead of 0][1.7p].
3336 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
3337 * [Borrows of closure parameters may not outlive the closure][1.7bc].
3339 [1.7a]: https://github.com/rust-lang/rust/pull/30928
3340 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
3341 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
3342 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
3343 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
3344 [1.7d]: https://github.com/rust-lang/rust/pull/30724
3345 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
3346 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
3347 [1.7f]: https://github.com/rust-lang/rust/pull/30672
3348 [1.7h]: https://github.com/rust-lang/rust/pull/30818
3349 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
3350 [1.7m]: https://github.com/rust-lang/rust/pull/30381
3351 [1.7p]: https://github.com/rust-lang/rust/pull/30681
3352 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
3353 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
3354 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
3355 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
3356 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
3357 [1.7v]: https://github.com/rust-lang/rust/pull/29973
3358 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3359 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3360 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
3361 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
3362 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
3363 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
3364 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
3365 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
3366 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
3367 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
3368 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
3369 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
3370 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
3371 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
3372 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
3373 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
3374 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
3375 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
3376 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
3377 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
3378 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
3379 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
3380 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
3381 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
3382 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
3383 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
3384 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
3385 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
3386 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
3387 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
3388 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
3389 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
3390 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
3391 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
3392 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
3393 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
3394 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
3395 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
3396 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
3397 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
3398 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
3399 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
3400 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
3401 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
3402 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
3403 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
3404 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
3405 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3406 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
3407 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3408 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
3409 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
3410 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
3411 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
3412 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
3413 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
3414 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
3415 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
3416 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
3417 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
3420 Version 1.6.0 (2016-01-21)
3421 ==========================
3426 * The `#![no_std]` attribute causes a crate to not be linked to the
3427 standard library, but only the [core library][1.6co], as described
3428 in [RFC 1184]. The core library defines common types and traits but
3429 has no platform dependencies whatsoever, and is the basis for Rust
3430 software in environments that cannot support a full port of the
3431 standard library, such as operating systems. Most of the core
3432 library is now stable.
3438 [`Read::read_exact`],
3439 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
3440 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
3441 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
3442 [`os::unix::fs::DirBuilderExt`],
3443 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
3444 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
3445 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
3446 [`collections::hash_map::Drain`],
3447 [`collections::hash_map::HashMap::drain`],
3448 [`collections::hash_set::Drain`],
3449 [`collections::hash_set::HashSet::drain`],
3450 [`collections::binary_heap::Drain`],
3451 [`collections::binary_heap::BinaryHeap::drain`],
3452 [`Vec::extend_from_slice`][] (renamed from `push_all`),
3453 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
3454 [`RwLock::into_inner`],
3455 [`Iterator::min_by_key`][] (renamed from `min_by`),
3456 [`Iterator::max_by_key`][] (renamed from `max_by`).
3457 * The [core library][1.6co] is stable, as are most of its APIs.
3458 * [The `assert_eq!` macro supports arguments that don't implement
3459 `Sized`][1.6ae], such as arrays. In this way it behaves more like
3461 * Several timer functions that take duration in milliseconds [are
3462 deprecated in favor of those that take `Duration`][1.6ms]. These
3463 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
3464 `thread::park_timeout_ms`.
3465 * The algorithm by which `Vec` reserves additional elements was
3466 [tweaked to not allocate excessive space][1.6a] while still growing
3468 * `From` conversions are [implemented from integers to floats][1.6f]
3469 in cases where the conversion is lossless. Thus they are not
3470 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
3471 or `f64`. They are also not implemented for `isize` and `usize`
3472 because the implementations would be platform-specific. `From` is
3473 also implemented from `f32` to `f64`.
3474 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
3475 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
3476 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
3477 * [`BinaryHeap` was refactored][1.6bh] for modest performance
3479 * Sorting slices that are already sorted [is 50% faster in some
3485 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
3486 * Cargo build scripts can specify their dependencies by emitting the
3487 [`rerun-if-changed`][1.6rr] key.
3488 * crates.io will reject publication of crates with dependencies that
3489 have a wildcard version constraint. Crates with wildcard
3490 dependencies were seen to cause a variety of problems, as described
3491 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
3493 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
3494 release folder. A variety of artifacts that Cargo failed to clean
3495 are now correctly deleted.
3500 * The `unreachable_code` lint [warns when a function call's argument
3502 * The parser indicates [failures that may be caused by
3503 confusingly-similar Unicode characters][1.6uc]
3504 * Certain macro errors [are reported at definition time][1.6m], not
3510 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
3511 environment variable when locating crates. This was a pre-cargo
3512 feature for integrating with the package manager that was
3513 accidentally never removed.
3514 * [A number of bugs were fixed in the privacy checker][1.6p] that
3515 could cause previously-accepted code to break.
3516 * [Modules and unit/tuple structs may not share the same name][1.6ts].
3517 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
3518 struct pattern syntax (`Foo(..)`) can no longer be used to match
3519 unit structs. This is a warning now, but will become an error in
3520 future releases. Patterns that share the same name as a const are
3522 * A bug was fixed that causes [rustc not to apply default type
3523 parameters][1.6xc] when resolving certain method implementations of
3524 traits defined in other crates.
3526 [1.6a]: https://github.com/rust-lang/rust/pull/29454
3527 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
3528 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
3529 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
3530 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
3531 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
3532 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
3533 [1.6f]: https://github.com/rust-lang/rust/pull/29129
3534 [1.6m]: https://github.com/rust-lang/rust/pull/29828
3535 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
3536 [1.6p]: https://github.com/rust-lang/rust/pull/29726
3537 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
3538 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
3539 [1.6s]: https://github.com/rust-lang/rust/pull/29675
3540 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
3541 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
3542 [1.6us]: https://github.com/rust-lang/rust/pull/29383
3543 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
3544 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
3545 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3546 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
3547 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
3548 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
3549 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
3550 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
3551 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
3552 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
3553 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
3554 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
3555 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
3556 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
3557 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
3558 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
3559 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
3560 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
3561 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
3562 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
3563 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
3564 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
3565 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
3566 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
3567 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
3568 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
3569 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
3570 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
3571 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
3572 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
3575 Version 1.5.0 (2015-12-10)
3576 ==========================
3578 * ~700 changes, numerous bugfixes
3584 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
3585 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
3586 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
3587 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
3588 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
3589 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
3590 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
3591 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
3592 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
3593 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
3594 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
3595 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
3596 [`Path::read_link`], [`Path::symlink_metadata`],
3597 [`Utf8Error::valid_up_to`], [`Vec::resize`],
3598 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
3599 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
3600 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
3601 [`slice::split_first_mut`], [`slice::split_first`],
3602 [`slice::split_last_mut`], [`slice::split_last`],
3603 [`char::from_u32_unchecked`], [`fs::canonicalize`],
3604 [`str::MatchIndices`], [`str::RMatchIndices`],
3605 [`str::match_indices`], [`str::rmatch_indices`],
3606 [`str::slice_mut_unchecked`], [`string::ParseError`].
3607 * Rust applications hosted on crates.io can be installed locally to
3608 `~/.cargo/bin` with the [`cargo install`] command. Among other
3609 things this makes it easier to augment Cargo with new subcommands:
3610 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
3611 invoked as `cargo foo`.
3612 * Crates with wildcard (`*`) dependencies will [emit warnings when
3613 published][1.5w]. In 1.6 it will no longer be possible to publish
3614 crates with wildcard dependencies.
3619 * The rules determining when a particular lifetime must outlive
3620 a particular value (known as '[dropck]') have been [modified
3621 to not rely on parametricity][1.5p].
3622 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
3623 and `Arc`][1.5a]. Because these smart pointer types implement
3624 `Deref`, this causes breakage in cases where the interior type
3625 contains methods of the same name.
3626 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
3627 that they could drop their content. Soundness fix.
3628 * All method invocations are [properly checked][1.5wf1] for
3629 [well-formedness][1.5wf2]. Soundness fix.
3630 * Traits whose supertraits contain `Self` are [not object
3631 safe][1.5o]. Soundness fix.
3632 * Target specifications support a [`no_default_libraries`][1.5nd]
3633 setting that controls whether `-nodefaultlibs` is passed to the
3634 linker, and in turn the `is_like_windows` setting no longer affects
3635 the `-nodefaultlibs` flag.
3636 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
3637 * The `#[inline]` and `#[repr]` attributes [can only appear
3638 in valid locations][1.5at].
3639 * Native libraries linked from the local crate are [passed to
3640 the linker before native libraries from upstream crates][1.5nl].
3641 * Two rarely-used attributes, `#[no_debug]` and
3642 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
3643 * Negation of unsigned integers, which has been a warning for
3644 several releases, [is now behind a feature gate and will
3645 generate errors][1.5nu].
3646 * The parser accidentally accepted visibility modifiers on
3647 enum variants, a bug [which has been fixed][1.5ev].
3648 * [A bug was fixed that allowed `use` statements to import unstable
3654 * When evaluating expressions at compile-time that are not
3655 compile-time constants (const-evaluating expressions in non-const
3656 contexts), incorrect code such as overlong bitshifts and arithmetic
3657 overflow will [generate a warning instead of an error][1.5ce],
3658 delaying the error until runtime. This will allow the
3659 const-evaluator to be expanded in the future backwards-compatibly.
3660 * The `improper_ctypes` lint [no longer warns about using `isize` and
3661 `usize` in FFI][1.5ict].
3666 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
3668 * `Default` is [implemented for mutable slices][1.5d].
3669 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
3670 * There are now `From` conversions [between floating point
3671 types][1.5f] where the conversions are lossless.
3672 * There are now `From` conversions [between integer types][1.5i] where
3673 the conversions are lossless.
3674 * [`fs::Metadata` implements `Clone`][1.5fs].
3675 * The `parse` method [accepts a leading "+" when parsing
3677 * [`AsMut` is implemented for `Vec`][1.5am].
3678 * The `clone_from` implementations for `String` and `BinaryHeap` [have
3679 been optimized][1.5cf] and no longer rely on the default impl.
3680 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
3681 `unsafe extern "C"` function types now [implement `Clone`,
3682 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
3683 `fmt::Debug` for up to 12 arguments][1.5fp].
3684 * [Dropping `Vec`s is much faster in unoptimized builds when the
3685 element types don't implement `Drop`][1.5dv].
3686 * A bug that caused in incorrect behavior when [combining `VecDeque`
3687 with zero-sized types][1.5vdz] was resolved.
3688 * [`PartialOrd` for slices is faster][1.5po].
3693 * [Crate metadata size was reduced by 20%][1.5md].
3694 * [Improvements to code generation reduced the size of libcore by 3.3
3695 MB and rustc's memory usage by 18MB][1.5m].
3696 * [Improvements to deref translation increased performance in
3697 unoptimized builds][1.5dr].
3698 * Various errors in trait resolution [are deduplicated to only be
3699 reported once][1.5te].
3700 * Rust has preliminary [support for rumprun kernels][1.5rr].
3701 * Rust has preliminary [support for NetBSD on amd64][1.5na].
3703 [1.5use]: https://github.com/rust-lang/rust/pull/28364
3704 [1.5po]: https://github.com/rust-lang/rust/pull/28436
3705 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
3706 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
3707 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
3708 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
3709 [1.5md]: https://github.com/rust-lang/rust/pull/28521
3710 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
3711 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
3712 [1.5na]: https://github.com/rust-lang/rust/pull/28543
3713 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
3714 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
3715 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
3716 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
3717 [1.5te]: https://github.com/rust-lang/rust/pull/28645
3718 [1.5at]: https://github.com/rust-lang/rust/pull/28650
3719 [1.5am]: https://github.com/rust-lang/rust/pull/28663
3720 [1.5m]: https://github.com/rust-lang/rust/pull/28778
3721 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
3722 [1.5a]: https://github.com/rust-lang/rust/pull/28811
3723 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
3724 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
3725 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
3726 [1.5i]: https://github.com/rust-lang/rust/pull/28921
3727 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
3728 [1.5f]: https://github.com/rust-lang/rust/pull/29129
3729 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
3730 [1.5s]: https://github.com/rust-lang/rust/pull/29190
3731 [1.5d]: https://github.com/rust-lang/rust/pull/29245
3732 [1.5o]: https://github.com/rust-lang/rust/pull/29259
3733 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
3734 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3735 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
3736 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
3737 [1.5c]: https://github.com/rust-lang/rust/pull/29110
3738 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3739 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
3740 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
3741 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
3742 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
3743 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
3744 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
3745 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
3746 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
3747 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
3748 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
3749 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
3750 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
3751 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
3752 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
3753 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
3754 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
3755 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
3756 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
3757 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
3758 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
3759 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
3760 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
3761 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
3762 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
3763 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
3764 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
3765 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
3766 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
3767 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
3768 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
3769 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
3770 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
3771 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
3772 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
3773 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
3774 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
3775 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
3776 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
3777 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
3778 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
3779 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
3780 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
3781 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
3782 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
3783 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
3784 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
3785 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
3786 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
3787 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
3788 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
3789 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
3790 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
3791 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
3793 Version 1.4.0 (2015-10-29)
3794 ==========================
3796 * ~1200 changes, numerous bugfixes
3801 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
3802 GNU) are now supported and recommended for use.
3807 * [Several changes have been made to fix type soundness and improve
3808 the behavior of associated types][sound]. See [RFC 1214]. Although
3809 we have mostly introduced these changes as warnings this release, to
3810 become errors next release, there are still some scenarios that will
3811 see immediate breakage.
3812 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
3813 line breaks in addition to `\n`][crlf].
3814 * [Loans of `'static` lifetime extend to the end of a function][stat].
3815 * [`str::parse` no longer introduces avoidable rounding error when
3816 parsing floating point numbers. Together with earlier changes to
3817 float formatting/output, "round trips" like f.to_string().parse()
3818 now preserve the value of f exactly. Additionally, leading plus
3819 signs are now accepted][fp3].
3825 * `use` statements that import multiple items [can now rename
3826 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
3827 * [Binops work correctly on fat pointers][binfat].
3828 * `pub extern crate`, which does not behave as expected, [issues a
3829 warning][pec] until a better solution is found.
3834 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
3835 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
3836 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
3837 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
3838 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
3839 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
3840 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
3841 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
3842 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
3843 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
3844 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
3845 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
3846 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
3847 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
3848 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
3849 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
3850 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
3851 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
3853 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
3854 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
3855 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
3856 `f64::from_str_radix`.
3857 * [Reverse-searching strings is faster with the 'two-way'
3859 * [`std::io::copy` allows `?Sized` arguments][cc].
3860 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
3861 [override `count`, `nth` and `last` with an O(1)
3862 implementation][it].
3863 * [`Default` is implemented for arrays up to `[T; 32]`][d].
3864 * [`IntoRawFd` has been added to the Unix-specific prelude,
3865 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
3867 * [`Extend<String>` and `FromIterator<String` are both implemented for
3869 * [`IntoIterator` is implemented for references to `Option` and
3871 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
3872 Copy`][ext] as part of [RFC 839]. This will cause type inference
3873 breakage in rare situations.
3874 * [`BinaryHeap` implements `Debug`][bh2].
3875 * [`Borrow` and `BorrowMut` are implemented for fixed-size
3877 * [`extern fn`s with the "Rust" and "C" ABIs implement common
3878 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
3879 * [String comparison is faster][faststr].
3880 * `&mut T` where `T: std::fmt::Write` [also implements
3881 `std::fmt::Write`][mutw].
3882 * [A stable regression in `VecDeque::push_back` and other
3883 capacity-altering methods that caused panics for zero-sized types
3885 * [Function pointers implement traits for up to 12 parameters][fp2].
3890 * The compiler [no longer uses the 'morestack' feature to prevent
3891 stack overflow][mm]. Instead it uses guard pages and stack
3892 probes (though stack probes are not yet implemented on any platform
3894 * [The compiler matches traits faster when projections are involved][p].
3895 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
3897 * [Cargo now displays useful information about what its doing during
3898 `cargo update`][cu].
3900 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
3901 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
3902 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
3903 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
3904 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
3905 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
3906 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
3907 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
3908 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
3909 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
3910 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
3911 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
3912 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
3913 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
3914 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
3915 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
3916 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
3917 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
3918 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3919 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3920 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3921 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3922 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3923 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3924 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3925 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3926 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
3927 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
3928 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
3929 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
3930 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
3931 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
3932 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
3933 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
3934 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
3935 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
3936 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
3937 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
3938 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
3939 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
3940 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
3941 [bh2]: https://github.com/rust-lang/rust/pull/28156
3942 [binfat]: https://github.com/rust-lang/rust/pull/28270
3943 [bm]: https://github.com/rust-lang/rust/pull/28197
3944 [cc]: https://github.com/rust-lang/rust/pull/27531
3945 [crlf]: https://github.com/rust-lang/rust/pull/28034
3946 [cu]: https://github.com/rust-lang/cargo/pull/1931
3947 [d]: https://github.com/rust-lang/rust/pull/27825
3948 [dep]: https://github.com/rust-lang/rust/pull/28339
3949 [es]: https://github.com/rust-lang/rust/pull/27956
3950 [ext]: https://github.com/rust-lang/rust/pull/28094
3951 [faststr]: https://github.com/rust-lang/rust/pull/28338
3952 [ffi]: https://github.com/rust-lang/rust/pull/28779
3953 [fp]: https://github.com/rust-lang/rust/pull/28268
3954 [fp2]: https://github.com/rust-lang/rust/pull/28560
3955 [fp3]: https://github.com/rust-lang/rust/pull/27307
3956 [i]: https://github.com/rust-lang/rust/pull/27451
3957 [into2]: https://github.com/rust-lang/rust/pull/28039
3958 [it]: https://github.com/rust-lang/rust/pull/27652
3959 [mm]: https://github.com/rust-lang/rust/pull/27338
3960 [mutw]: https://github.com/rust-lang/rust/pull/28368
3961 [sound]: https://github.com/rust-lang/rust/pull/27641
3962 [p]: https://github.com/rust-lang/rust/pull/27866
3963 [pec]: https://github.com/rust-lang/rust/pull/28486
3964 [pr]: https://github.com/rust-lang/rust/pull/27896
3965 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
3966 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3967 [s]: https://github.com/rust-lang/rust/pull/27474
3968 [stab]: https://github.com/rust-lang/rust/pull/28339
3969 [stat]: https://github.com/rust-lang/rust/pull/28321
3970 [vd]: https://github.com/rust-lang/rust/pull/28494
3972 Version 1.3.0 (2015-09-17)
3973 ==============================
3975 * ~900 changes, numerous bugfixes
3980 * The [new object lifetime defaults][nold] have been [turned
3981 on][nold2] after a cycle of warnings about the change. Now types
3982 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
3983 being interpreted as `&'a Box<Trait+'a>` to `&'a
3984 Box<Trait+'static>`.
3985 * [The Rustonomicon][nom] is a new book in the official documentation
3986 that dives into writing unsafe Rust.
3987 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
3988 timekeeping is employed by other std APIs, as well as out-of-tree
3994 * The [new object lifetime defaults][nold] have been [turned
3995 on][nold2] after a cycle of warnings about the change.
3996 * There is a known [regression][lr] in how object lifetime elision is
3997 interpreted, the proper solution for which is undetermined.
3998 * The `#[prelude_import]` attribute, an internal implementation
3999 detail, was accidentally stabilized previously. [It has been put
4000 behind the `prelude_import` feature gate][pi]. This change is
4001 believed to break no existing code.
4002 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4003 [more sane for dynamically sized types][dst3]. Code that relied on
4004 the previous behavior is thought to be broken.
4005 * The `dropck` rules, which checks that destructors can't access
4006 destroyed values, [have been updated][dropck] to match the
4007 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4008 cause some previously-compiling code to no longer build.
4013 * The [new object lifetime defaults][nold] have been [turned
4014 on][nold2] after a cycle of warnings about the change.
4015 * Semicolons may [now follow types and paths in
4016 macros](https://github.com/rust-lang/rust/pull/27000).
4017 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4018 [more sane for dynamically sized types][dst3]. Code that relied on
4019 the previous behavior is not known to exist, and suspected to be
4021 * `'static` variables [may now be recursive][st].
4022 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4023 implementations correctly.
4024 * The `dropck` rules, which checks that destructors can't access
4025 destroyed values, [have been updated][dropck] to match the
4031 * The [`Duration`] API, [has been stabilized][ds], as well as the
4032 `std::time` module, which presently contains only `Duration`.
4033 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4034 * The owned C string, [`CString`], implements [`Borrow`] and the
4035 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4036 these allow C strings to be borrowed and cloned in generic code.
4037 * [`CStr`] implements [`Debug`].
4038 * [`AtomicPtr`] implements [`Debug`].
4039 * [`Error`] trait objects [can be downcast to their concrete types][e]
4040 in many common configurations, using the [`is`], [`downcast`],
4041 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4043 * Searching for substrings now [employs the two-way algorithm][search]
4044 instead of doing a naive search. This gives major speedups to a
4045 number of methods, including [`contains`][sc], [`find`][sf],
4046 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4047 [`ends_with`][sew] are also faster.
4048 * The performance of `PartialEq` for slices is [much faster][ps].
4049 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4050 is overridden and optimized by the implementations for scalars.
4051 * The [`Hasher`] trait now has a number of specialized `write_*`
4052 methods for primitive types, for efficiency.
4053 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4054 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4055 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4056 of [`std::error::Error::cause`][iec] also delegates to the inner
4058 * [`process::Child`][pc] gained the [`id`] method, which returns a
4059 `u32` representing the platform-specific process identifier.
4060 * The [`connect`] method on slices is deprecated, replaced by the new
4061 [`join`] method (note that both of these are on the *unstable*
4062 [`SliceConcatExt`] trait, but through the magic of the prelude are
4063 available to stable code anyway).
4064 * The [`Div`] operator is implemented for [`Wrapping`] types.
4065 * [`DerefMut` is implemented for `String`][dms].
4066 * Performance of SipHash (the default hasher for `HashMap`) is
4067 [better for long data][sh].
4068 * [`AtomicPtr`] implements [`Send`].
4069 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4070 are now [specialized to use uninitialized buffers for increased
4072 * Lifetime parameters of foreign functions [are now resolved
4078 * Rust can now, with some coercion, [produce programs that run on
4079 Windows XP][xp], though XP is not considered a supported platform.
4080 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4081 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4082 recommended for use in 1.3, though should be fully-functional
4083 in the [64-bit 1.4 beta][b14].
4084 * On Fedora-based systems installation will [properly configure the
4085 dynamic linker][fl].
4086 * The compiler gained many new extended error descriptions, which can
4087 be accessed with the `--explain` flag.
4088 * The `dropck` pass, which checks that destructors can't access
4089 destroyed values, [has been rewritten][dropck]. This fixes some
4090 soundness holes, and as such will cause some previously-compiling
4091 code to no longer build.
4092 * `rustc` now uses [LLVM to write archive files where possible][ar].
4093 Eventually this will eliminate the compiler's dependency on the ar
4095 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4096 supported FreeBSD on x86_64).
4097 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4098 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4100 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4101 will kill the process instead of leaking][nlp].
4103 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4104 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4105 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4106 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4107 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4108 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4109 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4110 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4111 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4112 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4113 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4114 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4115 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4116 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4117 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4118 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4119 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4120 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4121 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4122 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4123 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4124 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4125 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4126 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4127 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4128 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4129 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4130 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4131 [ar]: https://github.com/rust-lang/rust/pull/26926
4132 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4133 [dms]: https://github.com/rust-lang/rust/pull/26241
4134 [dropck]: https://github.com/rust-lang/rust/pull/27261
4135 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4136 [ds]: https://github.com/rust-lang/rust/pull/26818
4137 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4138 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4139 [dst3]: https://github.com/rust-lang/rust/pull/27351
4140 [e]: https://github.com/rust-lang/rust/pull/24793
4141 [f]: https://github.com/rust-lang/rust/pull/26588
4142 [fb]: https://github.com/rust-lang/rust/pull/26959
4143 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4144 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4145 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4146 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4147 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4148 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4149 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4150 [lic]: https://github.com/rust-lang/rust/pull/26583
4151 [lnu]: https://github.com/rust-lang/rust/pull/27026
4152 [lr]: https://github.com/rust-lang/rust/issues/27248
4153 [lum]: https://github.com/rust-lang/rust/pull/26378
4154 [lur]: https://github.com/rust-lang/rust/pull/26783
4155 [nlp]: https://github.com/rust-lang/rust/pull/27176
4156 [nold2]: https://github.com/rust-lang/rust/pull/27045
4157 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4158 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4159 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4160 [pi]: https://github.com/rust-lang/rust/pull/26699
4161 [ps]: https://github.com/rust-lang/rust/pull/26884
4162 [rte]: https://github.com/rust-lang/rust/pull/26950
4163 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4164 [search]: https://github.com/rust-lang/rust/pull/26327
4165 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4166 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4167 [sh]: https://github.com/rust-lang/rust/pull/27280
4168 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4169 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4170 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4171 [st]: https://github.com/rust-lang/rust/pull/26630
4172 [win1]: https://github.com/rust-lang/rust/pull/26569
4173 [win2]: https://github.com/rust-lang/rust/pull/26741
4174 [win3]: https://github.com/rust-lang/rust/pull/26741
4175 [win4]: https://github.com/rust-lang/rust/pull/27210
4176 [xp]: https://github.com/rust-lang/rust/pull/26569
4178 Version 1.2.0 (2015-08-07)
4179 ==========================
4181 * ~1200 changes, numerous bugfixes
4186 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4187 like `Rc` to contain types without a fixed size, arrays and trait
4188 objects, finally enabling use of `Rc<[T]>` and completing the
4189 implementation of DST.
4190 * [Parallel codegen][parcodegen] is now working again, which can
4191 substantially speed up large builds in debug mode; It also gets
4192 another ~33% speedup when bootstrapping on a 4 core machine (using 8
4193 jobs). It's not enabled by default, but will be "in the near
4194 future". It can be activated with the `-C codegen-units=N` flag to
4196 * This is the first release with [experimental support for linking
4197 with the MSVC linker and lib C on Windows (instead of using the GNU
4198 variants via MinGW)][win]. It is yet recommended only for the most
4199 intrepid Rustaceans.
4200 * Benchmark compilations are showing a 30% improvement in
4201 bootstrapping over 1.1.
4206 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
4207 unicode case mapping, which is a previously-planned change in
4208 behavior and considered a bugfix.
4209 * [`mem::align_of`] now specifies [the *minimum alignment* for
4210 T][align], which is usually the alignment programs are interested
4211 in, and the same value reported by clang's
4212 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
4214 * [The `#[packed]` attribute is no longer silently accepted by the
4215 compiler][packed]. This attribute did nothing and code that
4216 mentioned it likely did not work as intended.
4217 * Associated type defaults are [now behind the
4218 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
4219 defaults *did not work*, but could be mentioned syntactically. As
4220 such this breakage has minimal impact.
4225 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
4226 matching against dereferencable values.
4231 * The [`Extend`] trait, which grows a collection from an iterator, is
4232 implemented over iterators of references, for `String`, `Vec`,
4233 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
4234 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
4235 * The [`iter::once`] function returns an iterator that yields a single
4236 element, and [`iter::empty`] returns an iterator that yields no
4238 * The [`matches`] and [`rmatches`] methods on `str` return iterators
4239 over substring matches.
4240 * [`Cell`] and [`RefCell`] both implement `Eq`.
4241 * A number of methods for wrapping arithmetic are added to the
4242 integral types, [`wrapping_div`], [`wrapping_rem`],
4243 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
4244 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
4245 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
4246 type.. It is illegal for the default arithmetic operations in Rust
4247 to overflow; the desire to wrap must be explicit.
4248 * The `{:#?}` formatting specifier [displays the alternate,
4249 pretty-printed][debugfmt] form of the `Debug` formatter. This
4250 feature was actually introduced prior to 1.0 with little
4252 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
4253 for writing data to formatted strings, similar to [`io::Write`].
4254 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
4255 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
4256 are used by code generators to emit implementations of [`Debug`].
4257 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
4258 methods that convert case, following Unicode case mapping.
4259 * It is now easier to handle poisoned locks. The [`PoisonError`]
4260 type, returned by failing lock operations, exposes `into_inner`,
4261 `get_ref`, and `get_mut`, which all give access to the inner lock
4262 guard, and allow the poisoned lock to continue to operate. The
4263 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
4264 poisoned lock without attempting to take the lock.
4265 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
4266 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
4267 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
4268 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
4270 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
4276 * `rustc` employs smarter heuristics for guessing at [typos].
4277 * `rustc` emits more efficient code for [no-op conversions between
4278 unsafe pointers][nop].
4279 * Fat pointers are now [passed in pairs of immediate arguments][fat],
4280 resulting in faster compile times and smaller code.
4282 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
4283 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4284 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
4285 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
4286 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
4287 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
4288 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
4289 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
4290 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
4291 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
4292 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
4293 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
4294 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
4295 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
4296 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
4297 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
4298 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4299 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
4300 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
4301 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
4302 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
4303 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
4304 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
4305 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
4306 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
4307 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4308 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
4309 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
4310 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
4311 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
4312 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
4313 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
4314 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
4315 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4316 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4317 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
4318 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
4319 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
4320 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
4321 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
4322 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
4323 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4324 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
4325 [align]: https://github.com/rust-lang/rust/pull/25646
4326 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
4327 [typos]: https://github.com/rust-lang/rust/pull/26087
4328 [nop]: https://github.com/rust-lang/rust/pull/26336
4329 [fat]: https://github.com/rust-lang/rust/pull/26411
4330 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
4331 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
4332 [packed]: https://github.com/rust-lang/rust/pull/25541
4333 [ad]: https://github.com/rust-lang/rust/pull/27382
4334 [win]: https://github.com/rust-lang/rust/pull/25350
4336 Version 1.1.0 (2015-06-25)
4337 =========================
4339 * ~850 changes, numerous bugfixes
4344 * The [`std::fs` module has been expanded][fs] to expand the set of
4345 functionality exposed:
4346 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
4347 don't incur a syscall on some platforms.
4348 * A `symlink_metadata` function has been added.
4349 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
4350 access to all underlying information.
4351 * The compiler now contains extended explanations of many errors. When an error
4352 with an explanation occurs the compiler suggests using the `--explain` flag
4353 to read the explanation. Error explanations are also [available online][err-index].
4354 * Thanks to multiple [improvements][sk] to [type checking][pre], as
4355 well as other work, the time to bootstrap the compiler decreased by
4361 * The [`str::split_whitespace`] method splits a string on unicode
4362 whitespace boundaries.
4363 * On both Windows and Unix, new extension traits provide conversion of
4364 I/O types to and from the underlying system handles. On Unix, these
4365 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
4366 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
4367 `TcpListener`, and `UpdSocket`. Further implementations for
4368 `std::process` will be stabilized later.
4369 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
4370 Windows, symlinks can be created with
4371 `std::os::windows::symlink_dir` and
4372 `std::os::windows::symlink_file`.
4373 * The `mpsc::Receiver` type can now be converted into an iterator with
4374 `into_iter` on the [`IntoIterator`] trait.
4375 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
4376 implementation of the [`From`] trait.
4377 * The `Debug` implementation for `RangeFull` [creates output that is
4378 more consistent with other implementations][rf].
4379 * [`Debug` is implemented for `File`][file].
4380 * The `Default` implementation for `Arc` [no longer requires `Sync +
4382 * [The `Iterator` methods `count`, `nth`, and `last` have been
4383 overridden for slices to have O(1) performance instead of O(n)][si].
4384 * Incorrect handling of paths on Windows has been improved in both the
4385 compiler and the standard library.
4386 * [`AtomicPtr` gained a `Default` implementation][ap].
4387 * In accordance with Rust's policy on arithmetic overflow `abs` now
4388 [panics on overflow when debug assertions are enabled][abs].
4389 * The [`Cloned`] iterator, which was accidentally left unstable for
4390 1.0 [has been stabilized][c].
4391 * The [`Incoming`] iterator, which iterates over incoming TCP
4392 connections, and which was accidentally unnamable in 1.0, [is now
4393 properly exported][inc].
4394 * [`BinaryHeap`] no longer corrupts itself [when functions called by
4395 `sift_up` or `sift_down` panic][bh].
4396 * The [`split_off`] method of `LinkedList` [no longer corrupts
4397 the list in certain scenarios][ll].
4402 * Type checking performance [has improved notably][sk] with
4403 [multiple improvements][pre].
4404 * The compiler [suggests code changes][ch] for more errors.
4405 * rustc and it's build system have experimental support for [building
4406 toolchains against MUSL][m] instead of glibc on Linux.
4407 * The compiler defines the `target_env` cfg value, which is used for
4408 distinguishing toolchains that are otherwise for the same
4409 platform. Presently this is set to `gnu` for common GNU Linux
4410 targets and for MinGW targets, and `musl` for MUSL Linux targets.
4411 * The [`cargo rustc`][crc] command invokes a build with custom flags
4413 * [Android executables are always position independent][pie].
4414 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
4417 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
4418 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4419 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4420 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
4421 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
4422 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
4423 [rf]: https://github.com/rust-lang/rust/pull/24491
4424 [err-index]: https://doc.rust-lang.org/error-index.html
4425 [sk]: https://github.com/rust-lang/rust/pull/24615
4426 [pre]: https://github.com/rust-lang/rust/pull/25323
4427 [file]: https://github.com/rust-lang/rust/pull/24598
4428 [ch]: https://github.com/rust-lang/rust/pull/24683
4429 [arc]: https://github.com/rust-lang/rust/pull/24695
4430 [si]: https://github.com/rust-lang/rust/pull/24701
4431 [ap]: https://github.com/rust-lang/rust/pull/24834
4432 [m]: https://github.com/rust-lang/rust/pull/24777
4433 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
4434 [crc]: https://github.com/rust-lang/cargo/pull/1568
4435 [pie]: https://github.com/rust-lang/rust/pull/24953
4436 [abs]: https://github.com/rust-lang/rust/pull/25441
4437 [c]: https://github.com/rust-lang/rust/pull/25496
4438 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
4439 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
4440 [inc]: https://github.com/rust-lang/rust/pull/25522
4441 [bh]: https://github.com/rust-lang/rust/pull/25856
4442 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
4443 [ll]: https://github.com/rust-lang/rust/pull/26022
4444 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
4445 [drop]: https://github.com/rust-lang/rust/pull/24935
4447 Version 1.0.0 (2015-05-15)
4448 ========================
4450 * ~1500 changes, numerous bugfixes
4455 * The vast majority of the standard library is now `#[stable]`. It is
4456 no longer possible to use unstable features with a stable build of
4458 * Many popular crates on [crates.io] now work on the stable release
4460 * Arithmetic on basic integer types now [checks for overflow in debug
4466 * Several [restrictions have been added to trait coherence][coh] in
4467 order to make it easier for upstream authors to change traits
4468 without breaking downstream code.
4469 * Digits of binary and octal literals are [lexed more eagerly][lex] to
4470 improve error messages and macro behavior. For example, `0b1234` is
4471 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
4472 * Trait bounds [are always invariant][inv], eliminating the need for
4473 the `PhantomFn` and `MarkerTrait` lang items, which have been
4475 * ["-" is no longer a valid character in crate names][cr], the `extern crate
4476 "foo" as bar` syntax has been replaced with `extern crate foo as
4477 bar`, and Cargo now automatically translates "-" in *package* names
4478 to underscore for the crate name.
4479 * [Lifetime shadowing is an error][lt].
4480 * [`Send` no longer implies `'static`][send-rfc].
4481 * [UFCS now supports trait-less associated paths][moar-ufcs] like
4482 `MyType::default()`.
4483 * Primitive types [now have inherent methods][prim-inherent],
4484 obviating the need for extension traits like `SliceExt`.
4485 * Methods with `Self: Sized` in their `where` clause are [considered
4486 object-safe][self-sized], allowing many extension traits like
4487 `IteratorExt` to be merged into the traits they extended.
4488 * You can now [refer to associated types][assoc-where] whose
4489 corresponding trait bounds appear only in a `where` clause.
4490 * The final bits of [OIBIT landed][oibit-final], meaning that traits
4491 like `Send` and `Sync` are now library-defined.
4492 * A [Reflect trait][reflect] was introduced, which means that
4493 downcasting via the `Any` trait is effectively limited to concrete
4494 types. This helps retain the potentially-important "parametricity"
4495 property: generic code cannot behave differently for different type
4496 arguments except in minor ways.
4497 * The `unsafe_destructor` feature is now deprecated in favor of the
4498 [new `dropck`][dropck]. This change is a major reduction in unsafe
4504 * The `thread_local` module [has been renamed to `std::thread`][th].
4505 * The methods of `IteratorExt` [have been moved to the `Iterator`
4507 * Several traits that implement Rust's conventions for type
4508 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
4509 [centralized in the `std::convert` module][con].
4510 * The `FromError` trait [was removed in favor of `From`][fe].
4511 * The basic sleep function [has moved to
4512 `std::thread::sleep_ms`][slp].
4513 * The `splitn` function now takes an `n` parameter that represents the
4514 number of items yielded by the returned iterator [instead of the
4515 number of 'splits'][spl].
4516 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
4517 * [Derived implementations of `PartialOrd` now order enums according
4518 to their explicitly-assigned discriminants][po].
4519 * [Methods for searching strings are generic over `Pattern`s][pat],
4520 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
4522 * [In method resolution, object methods are resolved before inherent
4524 * [`String::from_str` has been deprecated in favor of the `From` impl,
4525 `String::from`][sf].
4526 * [`io::Error` implements `Sync`][ios].
4527 * [The `words` method on `&str` has been replaced with
4528 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
4530 * The new path and IO modules are complete and `#[stable]`. This
4531 was the major library focus for this cycle.
4532 * The path API was [revised][path-normalize] to normalize `.`,
4533 adjusting the tradeoffs in favor of the most common usage.
4534 * A large number of remaining APIs in `std` were also stabilized
4535 during this cycle; about 75% of the non-deprecated API surface
4537 * The new [string pattern API][string-pattern] landed, which makes
4538 the string slice API much more internally consistent and flexible.
4539 * A new set of [generic conversion traits][conversion] replaced
4540 many existing ad hoc traits.
4541 * Generic numeric traits were [completely removed][num-traits]. This
4542 was made possible thanks to inherent methods for primitive types,
4543 and the removal gives maximal flexibility for designing a numeric
4544 hierarchy in the future.
4545 * The `Fn` traits are now related via [inheritance][fn-inherit]
4546 and provide ergonomic [blanket implementations][fn-blanket].
4547 * The `Index` and `IndexMut` traits were changed to
4548 [take the index by value][index-value], enabling code like
4549 `hash_map["string"]` to work.
4550 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
4551 `Copy` data is known to be `Clone` as well.
4556 * Many errors now have extended explanations that can be accessed with
4557 the `--explain` flag to `rustc`.
4558 * Many new examples have been added to the standard library
4560 * rustdoc has received a number of improvements focused on completion
4562 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
4563 * Much headway was made on ecosystem-wide CI, making it possible
4564 to [compare builds for breakage][ci-compare].
4567 [crates.io]: http://crates.io
4568 [clo]: https://github.com/rust-lang/rust/pull/24034
4569 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
4570 [con]: https://github.com/rust-lang/rust/pull/23875
4571 [cr]: https://github.com/rust-lang/rust/pull/23419
4572 [fe]: https://github.com/rust-lang/rust/pull/23879
4573 [ie]: https://github.com/rust-lang/rust/pull/23300
4574 [inv]: https://github.com/rust-lang/rust/pull/23938
4575 [ios]: https://github.com/rust-lang/rust/pull/24133
4576 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
4577 [lt]: https://github.com/rust-lang/rust/pull/24057
4578 [meth]: https://github.com/rust-lang/rust/pull/24056
4579 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
4580 [po]: https://github.com/rust-lang/rust/pull/24270
4581 [sf]: https://github.com/rust-lang/rust/pull/24517
4582 [slp]: https://github.com/rust-lang/rust/pull/23949
4583 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
4584 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
4585 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
4586 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
4587 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
4588 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
4589 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
4590 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
4591 [self-sized]: https://github.com/rust-lang/rust/pull/22301
4592 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
4593 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
4594 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
4595 [reflect]: https://github.com/rust-lang/rust/pull/23712
4596 [conversion]: https://github.com/rust-lang/rfcs/pull/529
4597 [num-traits]: https://github.com/rust-lang/rust/pull/23549
4598 [index-value]: https://github.com/rust-lang/rust/pull/23601
4599 [dropck]: https://github.com/rust-lang/rfcs/pull/769
4600 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
4601 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
4602 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
4603 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
4604 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
4607 Version 1.0.0-alpha.2 (2015-02-20)
4608 =====================================
4610 * ~1300 changes, numerous bugfixes
4614 * The various I/O modules were [overhauled][io-rfc] to reduce
4615 unnecessary abstractions and provide better interoperation with
4616 the underlying platform. The old `io` module remains temporarily
4618 * The standard library now [participates in feature gating][feat],
4619 so use of unstable libraries now requires a `#![feature(...)]`
4620 attribute. The impact of this change is [described on the
4621 forum][feat-forum]. [RFC][feat-rfc].
4625 * `for` loops [now operate on the `IntoIterator` trait][into],
4626 which eliminates the need to call `.iter()`, etc. to iterate
4627 over collections. There are some new subtleties to remember
4628 though regarding what sort of iterators various types yield, in
4629 particular that `for foo in bar { }` yields values from a move
4630 iterator, destroying the original collection. [RFC][into-rfc].
4631 * Objects now have [default lifetime bounds][obj], so you don't
4632 have to write `Box<Trait+'static>` when you don't care about
4633 storing references. [RFC][obj-rfc].
4634 * In types that implement `Drop`, [lifetimes must outlive the
4635 value][drop]. This will soon make it possible to safely
4636 implement `Drop` for types where `#[unsafe_destructor]` is now
4637 required. Read the [gorgeous RFC][drop-rfc] for details.
4638 * The fully qualified <T as Trait>::X syntax lets you set the Self
4639 type for a trait method or associated type. [RFC][ufcs-rfc].
4640 * References to types that implement `Deref<U>` now [automatically
4641 coerce to references][deref] to the dereferenced type `U`,
4642 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
4643 should eliminate many unsightly uses of `&*`, as when converting
4644 from references to vectors into references to
4645 slices. [RFC][deref-rfc].
4646 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
4647 `|:|`) is obsolete and closure kind is inferred from context.
4648 * [`Self` is a keyword][Self].
4652 * The `Show` and `String` formatting traits [have been
4653 renamed][fmt] to `Debug` and `Display` to more clearly reflect
4654 their related purposes. Automatically getting a string
4655 conversion to use with `format!("{:?}", something_to_debug)` is
4656 now written `#[derive(Debug)]`.
4657 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
4658 OsStr}`, provide strings in platform-specific encodings for easier
4659 interop with system APIs. [RFC][osstr-rfc].
4660 * The `boxed::into_raw` and `Box::from_raw` functions [convert
4661 between `Box<T>` and `*mut T`][boxraw], a common pattern for
4662 creating raw pointers.
4666 * Certain long error messages of the form 'expected foo found bar'
4667 are now [split neatly across multiple
4668 lines][multiline]. Examples in the PR.
4669 * On Unix Rust can be [uninstalled][un] by running
4670 `/usr/local/lib/rustlib/uninstall.sh`.
4671 * The `#[rustc_on_unimplemented]` attribute, requiring the
4672 'on_unimplemented' feature, lets rustc [display custom error
4673 messages when a trait is expected to be implemented for a type
4678 * Rust is tested against a [LALR grammar][lalr], which parses
4679 almost all the Rust files that rustc does.
4681 [boxraw]: https://github.com/rust-lang/rust/pull/21318
4682 [close]: https://github.com/rust-lang/rust/pull/21843
4683 [deref]: https://github.com/rust-lang/rust/pull/21351
4684 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
4685 [drop]: https://github.com/rust-lang/rust/pull/21972
4686 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4687 [feat]: https://github.com/rust-lang/rust/pull/21248
4688 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
4689 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
4690 [fmt]: https://github.com/rust-lang/rust/pull/21457
4691 [into]: https://github.com/rust-lang/rust/pull/20790
4692 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
4693 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4694 [lalr]: https://github.com/rust-lang/rust/pull/21452
4695 [multiline]: https://github.com/rust-lang/rust/pull/19870
4696 [obj]: https://github.com/rust-lang/rust/pull/22230
4697 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
4698 [onun]: https://github.com/rust-lang/rust/pull/20889
4699 [osstr]: https://github.com/rust-lang/rust/pull/21488
4700 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4701 [Self]: https://github.com/rust-lang/rust/pull/22158
4702 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
4703 [un]: https://github.com/rust-lang/rust/pull/22256
4706 Version 1.0.0-alpha (2015-01-09)
4707 ==================================
4709 * ~2400 changes, numerous bugfixes
4713 * The language itself is considered feature complete for 1.0,
4714 though there will be many usability improvements and bugfixes
4715 before the final release.
4716 * Nearly 50% of the public API surface of the standard library has
4717 been declared 'stable'. Those interfaces are unlikely to change
4719 * The long-running debate over integer types has been
4720 [settled][ints]: Rust will ship with types named `isize` and
4721 `usize`, rather than `int` and `uint`, for pointer-sized
4722 integers. Guidelines will be rolled out during the alpha cycle.
4723 * Most crates that are not `std` have been moved out of the Rust
4724 distribution into the Cargo ecosystem so they can evolve
4725 separately and don't need to be stabilized as quickly, including
4726 'time', 'getopts', 'num', 'regex', and 'term'.
4727 * Documentation continues to be expanded with more API coverage, more
4728 examples, and more in-depth explanations. The guides have been
4729 consolidated into [The Rust Programming Language][trpl].
4730 * "[Rust By Example][rbe]" is now maintained by the Rust team.
4731 * All official Rust binary installers now come with [Cargo], the
4732 Rust package manager.
4736 * Closures have been [completely redesigned][unboxed] to be
4737 implemented in terms of traits, can now be used as generic type
4738 bounds and thus monomorphized and inlined, or via an opaque
4739 pointer (boxed) as in the old system. The new system is often
4740 referred to as 'unboxed' closures.
4741 * Traits now support [associated types][assoc], allowing families
4742 of related types to be defined together and used generically in
4744 * Enum variants are [namespaced by their type names][enum].
4745 * [`where` clauses][where] provide a more versatile and attractive
4746 syntax for specifying generic bounds, though the previous syntax
4748 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
4750 * Rust [no longer has a runtime][rt] of any description, and only
4751 supports OS threads, not green threads.
4752 * At long last, Rust has been overhauled for 'dynamically-sized
4753 types' ([DST]), which integrates 'fat pointers' (object types,
4754 arrays, and `str`) more deeply into the type system, making it
4756 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
4757 `..j` that produce range types and which, when combined with the
4758 `Index` operator and multidispatch, leads to a convenient slice
4760 * The new range syntax revealed an ambiguity in the fixed-length
4761 array syntax, so now fixed length arrays [are written `[T;
4763 * The `Copy` trait is no longer implemented automatically. Unsafe
4764 pointers no longer implement `Sync` and `Send` so types
4765 containing them don't automatically either. `Sync` and `Send`
4766 are now 'unsafe traits' so one can "forcibly" implement them via
4767 `unsafe impl` if a type confirms to the requirements for them
4768 even though the internals do not (e.g. structs containing unsafe
4769 pointers like `Arc`). These changes are intended to prevent some
4770 footguns and are collectively known as [opt-in built-in
4771 traits][oibit] (though `Sync` and `Send` will soon become pure
4772 library types unknown to the compiler).
4773 * Operator traits now take their operands [by value][ops], and
4774 comparison traits can use multidispatch to compare one type
4775 against multiple other types, allowing e.g. `String` to be
4776 compared with `&str`.
4777 * `if let` and `while let` are no longer feature-gated.
4778 * Rust has adopted a more [uniform syntax for escaping unicode
4779 characters][unicode].
4780 * `macro_rules!` [has been declared stable][mac]. Though it is a
4781 flawed system it is sufficiently popular that it must be usable
4782 for 1.0. Effort has gone into [future-proofing][mac-future] it
4783 in ways that will allow other macro systems to be developed in
4784 parallel, and won't otherwise impact the evolution of the
4786 * The prelude has been [pared back significantly][prelude] such
4787 that it is the minimum necessary to support the most pervasive
4788 code patterns, and through [generalized where clauses][where]
4789 many of the prelude extension traits have been consolidated.
4790 * Rust's rudimentary reflection [has been removed][refl], as it
4791 incurred too much code generation for little benefit.
4792 * [Struct variants][structvars] are no longer feature-gated.
4793 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
4794 known as 'higher-ranked trait bounds', this crucially allows
4795 unboxed closures to work.
4796 * Macros invocations surrounded by parens or square brackets and
4797 not terminated by a semicolon are [parsed as
4798 expressions][macros], which makes expressions like `vec![1i32,
4799 2, 3].len()` work as expected.
4800 * Trait objects now implement their traits automatically, and
4801 traits that can be coerced to objects now must be [object
4803 * Automatically deriving traits is now done with `#[derive(...)]`
4804 not `#[deriving(...)]` for [consistency with other naming
4805 conventions][derive].
4806 * Importing the containing module or enum at the same time as
4807 items or variants they contain is [now done with `self` instead
4808 of `mod`][self], as in use `foo::{self, bar}`
4809 * Glob imports are no longer feature-gated.
4810 * The `box` operator and `box` patterns have been feature-gated
4811 pending a redesign. For now unique boxes should be allocated
4812 like other containers, with `Box::new`.
4816 * A [series][coll1] of [efforts][coll2] to establish
4817 [conventions][coll3] for collections types has resulted in API
4818 improvements throughout the standard library.
4819 * New [APIs for error handling][err] provide ergonomic interop
4820 between error types, and [new conventions][err-conv] describe
4821 more clearly the recommended error handling strategies in Rust.
4822 * The `fail!` macro has been renamed to [`panic!`][panic] so that
4823 it is easier to discuss failure in the context of error handling
4824 without making clarifications as to whether you are referring to
4825 the 'fail' macro or failure more generally.
4826 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
4827 syscall when available.
4828 * The 'serialize' crate has been renamed 'rustc-serialize' and
4829 moved out of the distribution to Cargo. Although it is widely
4830 used now, it is expected to be superseded in the near future.
4831 * The `Show` formatter, typically implemented with
4832 `#[derive(Show)]` is [now requested with the `{:?}`
4833 specifier][show] and is intended for use by all types, for uses
4834 such as `println!` debugging. The new `String` formatter must be
4835 implemented by hand, uses the `{}` specifier, and is intended
4836 for full-fidelity conversions of things that can logically be
4837 represented as strings.
4841 * [Flexible target specification][flex] allows rustc's code
4842 generation to be configured to support otherwise-unsupported
4844 * Rust comes with rust-gdb and rust-lldb scripts that launch their
4845 respective debuggers with Rust-appropriate pretty-printing.
4846 * The Windows installation of Rust is distributed with the
4847 MinGW components currently required to link binaries on that
4852 * Nullable enum optimizations have been extended to more types so
4853 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
4854 space than the inner types themselves.
4855 * Work has begun on supporting AArch64.
4857 [Cargo]: https://crates.io
4858 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
4859 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
4860 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
4861 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
4862 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
4863 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
4864 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
4865 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
4866 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
4867 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
4868 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
4869 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
4870 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
4871 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
4872 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
4873 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
4874 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
4875 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
4876 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
4877 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
4878 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
4879 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
4880 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
4881 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
4882 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
4883 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
4884 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
4885 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
4886 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
4887 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
4888 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
4889 [trpl]: https://doc.rust-lang.org/book/index.html
4890 [rbe]: http://rustbyexample.com/
4893 Version 0.12.0 (2014-10-09)
4894 =============================
4896 * ~1900 changes, numerous bugfixes
4900 * The introductory documentation (now called The Rust Guide) has
4901 been completely rewritten, as have a number of supplementary
4903 * Rust's package manager, Cargo, continues to improve and is
4904 sometimes considered to be quite awesome.
4905 * Many API's in `std` have been reviewed and updated for
4906 consistency with the in-development Rust coding
4907 guidelines. The standard library documentation tracks
4908 stabilization progress.
4909 * Minor libraries have been moved out-of-tree to the rust-lang org
4910 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
4911 be installed with Cargo.
4912 * Lifetime elision allows lifetime annotations to be left off of
4913 function declarations in many common scenarios.
4914 * Rust now works on 64-bit Windows.
4917 * Indexing can be overloaded with the `Index` and `IndexMut`
4919 * The `if let` construct takes a branch only if the `let` pattern
4920 matches, currently behind the 'if_let' feature gate.
4921 * 'where clauses', a more flexible syntax for specifying trait
4922 bounds that is more aesthetic, have been added for traits and
4923 free functions. Where clauses will in the future make it
4924 possible to constrain associated types, which would be
4925 impossible with the existing syntax.
4926 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
4927 the 'slicing_syntax' feature gate, and can be overloaded with
4928 the `Slice` or `SliceMut` traits.
4929 * The syntax for matching of sub-slices has been changed to use a
4930 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
4931 consistency with other uses of `..` and to future-proof
4932 potential additional uses of the syntax.
4933 * The syntax for matching inclusive ranges in patterns has changed
4934 from `0..3` to `0...4` to be consistent with the exclusive range
4936 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
4937 c]`) has been put behind the 'advanced_slice_patterns' feature
4938 gate and may be removed in the future.
4939 * Components of tuples and tuple structs can be extracted using
4940 the `value.0` syntax, currently behind the `tuple_indexing`
4942 * The `#[crate_id]` attribute is no longer supported; versioning
4943 is handled by the package manager.
4944 * Renaming crate imports are now written `extern crate foo as bar`
4945 instead of `extern crate bar = foo`.
4946 * Renaming use statements are now written `use foo as bar` instead
4948 * `let` and `match` bindings and argument names in macros are now
4950 * The new, more efficient, closure types ('unboxed closures') have
4951 been added under a feature gate, 'unboxed_closures'. These will
4952 soon replace the existing closure types, once higher-ranked
4953 trait lifetimes are added to the language.
4954 * `move` has been added as a keyword, for indicating closures
4955 that capture by value.
4956 * Mutation and assignment is no longer allowed in pattern guards.
4957 * Generic structs and enums can now have trait bounds.
4958 * The `Share` trait is now called `Sync` to free up the term
4959 'shared' to refer to 'shared reference' (the default reference
4961 * Dynamically-sized types have been mostly implemented,
4962 unifying the behavior of fat-pointer types with the rest of the
4964 * As part of dynamically-sized types, the `Sized` trait has been
4965 introduced, which qualifying types implement by default, and
4966 which type parameters expect by default. To specify that a type
4967 parameter does not need to be sized, write `<Sized? T>`. Most
4968 types are `Sized`, notable exceptions being unsized arrays
4969 (`[T]`) and trait types.
4970 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
4971 * Lifetime bounds can now be applied to type parameters and object
4973 * The old, reference counted GC type, `Gc<T>` which was once
4974 denoted by the `@` sigil, has finally been removed. GC will be
4975 revisited in the future.
4978 * Library documentation has been improved for a number of modules.
4979 * Bit-vectors, collections::bitv has been modernized.
4980 * The url crate is deprecated in favor of
4981 http://github.com/servo/rust-url, which can be installed with
4983 * Most I/O stream types can be cloned and subsequently closed from
4985 * A `std::time::Duration` type has been added for use in I/O
4986 methods that rely on timers, as well as in the 'time' crate's
4987 `Timespec` arithmetic.
4988 * The runtime I/O abstraction layer that enabled the green thread
4989 scheduler to do non-thread-blocking I/O has been removed, along
4990 with the libuv-based implementation employed by the green thread
4991 scheduler. This will greatly simplify the future I/O work.
4992 * `collections::btree` has been rewritten to have a more
4993 idiomatic and efficient design.
4996 * rustdoc output now indicates the stability levels of API's.
4997 * The `--crate-name` flag can specify the name of the crate
4998 being compiled, like `#[crate_name]`.
4999 * The `-C metadata` specifies additional metadata to hash into
5000 symbol names, and `-C extra-filename` specifies additional
5001 information to put into the output filename, for use by the
5002 package manager for versioning.
5003 * debug info generation has continued to improve and should be
5004 more reliable under both gdb and lldb.
5005 * rustc has experimental support for compiling in parallel
5006 using the `-C codegen-units` flag.
5007 * rustc no longer encodes rpath information into binaries by
5011 * Stack usage has been optimized with LLVM lifetime annotations.
5012 * Official Rust binaries on Linux are more compatible with older
5013 kernels and distributions, built on CentOS 5.10.
5016 Version 0.11.0 (2014-07-02)
5017 ==========================
5019 * ~1700 changes, numerous bugfixes
5022 * ~[T] has been removed from the language. This type is superseded by
5024 * ~str has been removed from the language. This type is superseded by
5026 * ~T has been removed from the language. This type is superseded by the
5028 * @T has been removed from the language. This type is superseded by the
5029 standard library's std::gc::Gc<T> type.
5030 * Struct fields are now all private by default.
5031 * Vector indices and shift amounts are both required to be a `uint`
5032 instead of any integral type.
5033 * Byte character, byte string, and raw byte string literals are now all
5034 supported by prefixing the normal literal with a `b`.
5035 * Multiple ABIs are no longer allowed in an ABI string
5036 * The syntax for lifetimes on closures/procedures has been tweaked
5037 slightly: `<'a>|A, B|: 'b + K -> T`
5038 * Floating point modulus has been removed from the language; however it
5039 is still provided by a library implementation.
5040 * Private enum variants are now disallowed.
5041 * The `priv` keyword has been removed from the language.
5042 * A closure can no longer be invoked through a &-pointer.
5043 * The `use foo, bar, baz;` syntax has been removed from the language.
5044 * The transmute intrinsic no longer works on type parameters.
5045 * Statics now allow blocks/items in their definition.
5046 * Trait bounds are separated from objects with + instead of : now.
5047 * Objects can no longer be read while they are mutably borrowed.
5048 * The address of a static is now marked as insignificant unless the
5049 #[inline(never)] attribute is placed it.
5050 * The #[unsafe_destructor] attribute is now behind a feature gate.
5051 * Struct literals are no longer allowed in ambiguous positions such as
5052 if, while, match, and for..in.
5053 * Declaration of lang items and intrinsics are now feature-gated by
5055 * Integral literals no longer default to `int`, and floating point
5056 literals no longer default to `f64`. Literals must be suffixed with an
5057 appropriate type if inference cannot determine the type of the
5059 * The Box<T> type is no longer implicitly borrowed to &mut T.
5060 * Procedures are now required to not capture borrowed references.
5063 * The standard library is now a "facade" over a number of underlying
5064 libraries. This means that development on the standard library should
5065 be speedier due to smaller crates, as well as a clearer line between
5067 * A new library, libcore, lives under the standard library's facade
5068 which is Rust's "0-assumption" library, suitable for embedded and
5069 kernel development for example.
5070 * A regex crate has been added to the standard distribution. This crate
5071 includes statically compiled regular expressions.
5072 * The unwrap/unwrap_err methods on Result require a Show bound for
5073 better error messages.
5074 * The return types of the std::comm primitives have been centralized
5075 around the Result type.
5076 * A number of I/O primitives have gained the ability to time out their
5078 * A number of I/O primitives have gained the ability to close their
5079 reading/writing halves to cancel pending operations.
5080 * Reverse iterator methods have been removed in favor of `rev()` on
5081 their forward-iteration counterparts.
5082 * A bitflags! macro has been added to enable easy interop with C and
5083 management of bit flags.
5084 * A debug_assert! macro is now provided which is disabled when
5085 `--cfg ndebug` is passed to the compiler.
5086 * A graphviz crate has been added for creating .dot files.
5087 * The std::cast module has been migrated into std::mem.
5088 * The std::local_data api has been migrated from freestanding functions
5089 to being based on methods.
5090 * The Pod trait has been renamed to Copy.
5091 * jemalloc has been added as the default allocator for types.
5092 * The API for allocating memory has been changed to use proper alignment
5093 and sized deallocation
5094 * Connecting a TcpStream or binding a TcpListener is now based on a
5095 string address and a u16 port. This allows connecting to a hostname as
5097 * The Reader trait now contains a core method, read_at_least(), which
5098 correctly handles many repeated 0-length reads.
5099 * The process-spawning API is now centered around a builder-style
5101 * The :? printing qualifier has been moved from the standard library to
5102 an external libdebug crate.
5103 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5104 have been renamed to Eq/Ord.
5105 * The select/plural methods have been removed from format!. The escapes
5106 for { and } have also changed from \{ and \} to {{ and }},
5108 * The TaskBuilder API has been re-worked to be a true builder, and
5109 extension traits for spawning native/green tasks have been added.
5112 * All breaking changes to the language or libraries now have their
5113 commit message annotated with `[breaking-change]` to allow for easy
5114 discovery of breaking changes.
5115 * The compiler will now try to suggest how to annotate lifetimes if a
5116 lifetime-related error occurs.
5117 * Debug info continues to be improved greatly with general bug fixes and
5118 better support for situations like link time optimization (LTO).
5119 * Usage of syntax extensions when cross-compiling has been fixed.
5120 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5121 -fdata-sections and --gc-sections has been enabled by default
5122 * The compiler is now stricter about where it will load module files
5123 from when a module is declared via `mod foo;`.
5124 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5125 Syntax extensions are now discovered via a "plugin registrar" type
5126 which will be extended in the future to other various plugins.
5127 * Lints have been restructured to allow for dynamically loadable lints.
5128 * A number of rustdoc improvements:
5129 * The HTML output has been visually redesigned.
5130 * Markdown is now powered by hoedown instead of sundown.
5131 * Searching heuristics have been greatly improved.
5132 * The search index has been reduced in size by a great amount.
5133 * Cross-crate documentation via `pub use` has been greatly improved.
5134 * Primitive types are now hyperlinked and documented.
5135 * Documentation has been moved from static.rust-lang.org/doc to
5137 * A new sandbox, play.rust-lang.org, is available for running and
5138 sharing rust code examples on-line.
5139 * Unused attributes are now more robustly warned about.
5140 * The dead_code lint now warns about unused struct fields.
5141 * Cross-compiling to iOS is now supported.
5142 * Cross-compiling to mipsel is now supported.
5143 * Stability attributes are now inherited by default and no longer apply
5144 to intra-crate usage, only inter-crate usage.
5145 * Error message related to non-exhaustive match expressions have been
5149 Version 0.10 (2014-04-03)
5150 =========================
5152 * ~1500 changes, numerous bugfixes
5155 * A new RFC process is now in place for modifying the language.
5156 * Patterns with `@`-pointers have been removed from the language.
5157 * Patterns with unique vectors (`~[T]`) have been removed from the
5159 * Patterns with unique strings (`~str`) have been removed from the
5161 * `@str` has been removed from the language.
5162 * `@[T]` has been removed from the language.
5163 * `@self` has been removed from the language.
5164 * `@Trait` has been removed from the language.
5165 * Headers on `~` allocations which contain `@` boxes inside the type for
5166 reference counting have been removed.
5167 * The semantics around the lifetimes of temporary expressions have changed,
5168 see #3511 and #11585 for more information.
5169 * Cross-crate syntax extensions are now possible, but feature gated. See
5170 #11151 for more information. This includes both `macro_rules!` macros as
5171 well as syntax extensions such as `format!`.
5172 * New lint modes have been added, and older ones have been turned on to be
5174 * Unnecessary parentheses
5177 * Uppercase variables
5178 * Publicly visible private types
5179 * `#[deriving]` with raw pointers
5180 * Unsafe functions can no longer be coerced to closures.
5181 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5182 * The `#[simd]` attribute is now behind a feature gate.
5183 * Visibility is no longer allowed on `extern crate` statements, and
5184 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5185 * Trailing commas are now allowed in argument lists and tuple patterns.
5186 * The `do` keyword has been removed, it is now a reserved keyword.
5187 * Default type parameters have been implemented, but are feature gated.
5188 * Borrowed variables through captures in closures are now considered soundly.
5189 * `extern mod` is now `extern crate`
5190 * The `Freeze` trait has been removed.
5191 * The `Share` trait has been added for types that can be shared among
5193 * Labels in macros are now hygienic.
5194 * Expression/statement macro invocations can be delimited with `{}` now.
5195 * Treatment of types allowed in `static mut` locations has been tweaked.
5196 * The `*` and `.` operators are now overloadable through the `Deref` and
5198 * `~Trait` and `proc` no longer have `Send` bounds by default.
5199 * Partial type hints are now supported with the `_` type marker.
5200 * An `Unsafe` type was introduced for interior mutability. It is now
5201 considered undefined to transmute from `&T` to `&mut T` without using the
5203 * The #[linkage] attribute was implemented for extern statics/functions.
5204 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
5205 * `Pod` was renamed to `Copy`.
5208 * The `libextra` library has been removed. It has now been decomposed into
5209 component libraries with smaller and more focused nuggets of
5210 functionality. The full list of libraries can be found on the
5211 documentation index page.
5212 * std: `std::condition` has been removed. All I/O errors are now propagated
5213 through the `Result` type. In order to assist with error handling, a
5214 `try!` macro for unwrapping errors with an early return and a lint for
5215 unused results has been added. See #12039 for more information.
5216 * std: The `vec` module has been renamed to `slice`.
5217 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
5218 This will become the only growable vector in the future.
5219 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
5220 are now found at `std::io::BufferedReader` instead of
5221 `std::io::buffered::BufferedReader`.
5222 * std: `print` and `println` are no longer in the prelude, the `print!` and
5223 `println!` macros are intended to be used instead.
5224 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
5225 attempts to statically prevent cycles.
5226 * std: The standard distribution is adopting the policy of pushing failure
5227 to the user rather than failing in libraries. Many functions (such as
5228 `slice::last()`) now return `Option<T>` instead of `T` + failing.
5229 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
5230 deriving mode: `#[deriving(Show)]`.
5231 * std: `ToStr` is now implemented for all types implementing `Show`.
5232 * std: The formatting trait methods now take `&self` instead of `&T`
5233 * std: The `invert()` method on iterators has been renamed to `rev()`
5234 * std: `std::num` has seen a reduction in the genericity of its traits,
5235 consolidating functionality into a few core traits.
5236 * std: Backtraces are now printed on task failure if the environment
5237 variable `RUST_BACKTRACE` is present.
5238 * std: Naming conventions for iterators have been standardized. More details
5239 can be found on the wiki's style guide.
5240 * std: `eof()` has been removed from the `Reader` trait. Specific types may
5241 still implement the function.
5242 * std: Networking types are now cloneable to allow simultaneous reads/writes.
5243 * std: `assert_approx_eq!` has been removed
5244 * std: The `e` and `E` formatting specifiers for floats have been added to
5245 print them in exponential notation.
5246 * std: The `Times` trait has been removed
5247 * std: Indications of variance and opting out of builtin bounds is done
5248 through marker types in `std::kinds::marker` now
5249 * std: `hash` has been rewritten, `IterBytes` has been removed, and
5250 `#[deriving(Hash)]` is now possible.
5251 * std: `SharedChan` has been removed, `Sender` is now cloneable.
5252 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
5253 * std: `Chan::new` is now `channel()`.
5254 * std: A new synchronous channel type has been implemented.
5255 * std: A `select!` macro is now provided for selecting over `Receiver`s.
5256 * std: `hashmap` and `trie` have been moved to `libcollections`
5257 * std: `run` has been rolled into `io::process`
5258 * std: `assert_eq!` now uses `{}` instead of `{:?}`
5259 * std: The equality and comparison traits have seen some reorganization.
5260 * std: `rand` has moved to `librand`.
5261 * std: `to_{lower,upper}case` has been implemented for `char`.
5262 * std: Logging has been moved to `liblog`.
5263 * collections: `HashMap` has been rewritten for higher performance and less
5265 * native: The default runtime is now `libnative`. If `libgreen` is desired,
5266 it can be booted manually. The runtime guide has more information and
5268 * native: All I/O functionality except signals has been implemented.
5269 * green: Task spawning with `libgreen` has been optimized with stack caching
5270 and various trimming of code.
5271 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
5272 * sync: The `extra::sync` module has been updated to modern rust (and moved
5273 to the `sync` library), tweaking and improving various interfaces while
5274 dropping redundant functionality.
5275 * sync: A new `Barrier` type has been added to the `sync` library.
5276 * sync: An efficient mutex for native and green tasks has been implemented.
5277 * serialize: The `base64` module has seen some improvement. It treats
5278 newlines better, has non-string error values, and has seen general
5280 * fourcc: A `fourcc!` macro was introduced
5281 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
5282 hexadecimal literal.
5285 * `rustpkg` has been deprecated and removed from the main repository. Its
5286 replacement, `cargo`, is under development.
5287 * Nightly builds of rust are now available
5288 * The memory usage of rustc has been improved many times throughout this
5290 * The build process supports disabling rpath support for the rustc binary
5292 * Code generation has improved in some cases, giving more information to the
5293 LLVM optimization passes to enable more extensive optimizations.
5294 * Debuginfo compatibility with lldb on OSX has been restored.
5295 * The master branch is now gated on an android bot, making building for
5296 android much more reliable.
5297 * Output flags have been centralized into one `--emit` flag.
5298 * Crate type flags have been centralized into one `--crate-type` flag.
5299 * Codegen flags have been consolidated behind a `-C` flag.
5300 * Linking against outdated crates now has improved error messages.
5301 * Error messages with lifetimes will often suggest how to annotate the
5302 function to fix the error.
5303 * Many more types are documented in the standard library, and new guides
5305 * Many `rustdoc` improvements:
5306 * code blocks are syntax highlighted.
5307 * render standalone markdown files.
5308 * the --test flag tests all code blocks by default.
5309 * exported macros are displayed.
5310 * re-exported types have their documentation inlined at the location of the
5312 * search works across crates that have been rendered to the same output
5316 Version 0.9 (2014-01-09)
5317 ==========================
5319 * ~1800 changes, numerous bugfixes
5322 * The `float` type has been removed. Use `f32` or `f64` instead.
5323 * A new facility for enabling experimental features (feature gating) has
5324 been added, using the crate-level `#[feature(foo)]` attribute.
5325 * Managed boxes (@) are now behind a feature gate
5326 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
5327 standard library's `Gc` or `Rc` types instead.
5328 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
5329 * Jumping back to the top of a loop is now done with `continue` instead of
5331 * Strings can no longer be mutated through index assignment.
5332 * Raw strings can be created via the basic `r"foo"` syntax or with matched
5333 hash delimiters, as in `r###"foo"###`.
5334 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
5336 * The `&fn` type is now written `|args| -> ret` to match the literal form.
5337 * `@fn`s have been removed.
5338 * `do` only works with procs in order to make it obvious what the cost
5340 * Single-element tuple-like structs can no longer be dereferenced to
5341 obtain the inner value. A more comprehensive solution for overloading
5342 the dereference operator will be provided in the future.
5343 * The `#[link(...)]` attribute has been replaced with
5344 `#[crate_id = "name#vers"]`.
5345 * Empty `impl`s must be terminated with empty braces and may not be
5346 terminated with a semicolon.
5347 * Keywords are no longer allowed as lifetime names; the `self` lifetime
5348 no longer has any special meaning.
5349 * The old `fmt!` string formatting macro has been removed.
5350 * `printf!` and `printfln!` (old-style formatting) removed in favor of
5351 `print!` and `println!`.
5352 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
5353 * The `extern mod foo (name = "bar")` syntax has been removed. Use
5354 `extern mod foo = "bar"` instead.
5355 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
5356 * Macros can have attributes.
5357 * Macros can expand to items with attributes.
5358 * Macros can expand to multiple items.
5359 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
5360 * Comments may be nested.
5361 * Values automatically coerce to trait objects they implement, without
5363 * Enum discriminants are no longer an entire word but as small as needed to
5364 contain all the variants. The `repr` attribute can be used to override
5365 the discriminant size, as in `#[repr(int)]` for integer-sized, and
5366 `#[repr(C)]` to match C enums.
5367 * Non-string literals are not allowed in attributes (they never worked).
5368 * The FFI now supports variadic functions.
5369 * Octal numeric literals, as in `0o7777`.
5370 * The `concat!` syntax extension performs compile-time string concatenation.
5371 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
5372 removed as Rust no longer uses segmented stacks.
5373 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
5374 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
5375 not `*`; ignoring remaining fields of a struct is also done with `..`,
5376 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
5377 * `rustc` supports the "win64" calling convention via `extern "win64"`.
5378 * `rustc` supports the "system" calling convention, which defaults to the
5379 preferred convention for the target platform, "stdcall" on 32-bit Windows,
5381 * The `type_overflow` lint (default: warn) checks literals for overflow.
5382 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
5383 * The `attribute_usage` lint (default: warn) warns about unknown
5385 * The `unknown_features` lint (default: warn) warns about unknown
5387 * The `dead_code` lint (default: warn) checks for dead code.
5388 * Rust libraries can be linked statically to one another
5389 * `#[link_args]` is behind the `link_args` feature gate.
5390 * Native libraries are now linked with `#[link(name = "foo")]`
5391 * Native libraries can be statically linked to a rust crate
5392 (`#[link(name = "foo", kind = "static")]`).
5393 * Native OS X frameworks are now officially supported
5394 (`#[link(name = "foo", kind = "framework")]`).
5395 * The `#[thread_local]` attribute creates thread-local (not task-local)
5396 variables. Currently behind the `thread_local` feature gate.
5397 * The `return` keyword may be used in closures.
5398 * Types that can be copied via a memcpy implement the `Pod` kind.
5399 * The `cfg` attribute can now be used on struct fields and enum variants.
5402 * std: The `option` and `result` API's have been overhauled to make them
5403 simpler, more consistent, and more composable.
5404 * std: The entire `std::io` module has been replaced with one that is
5405 more comprehensive and that properly interfaces with the underlying
5406 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
5408 * std: `io::util` contains a number of useful implementations of
5409 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
5410 `ZeroReader`, `TeeReader`.
5411 * std: The reference counted pointer type `extra::rc` moved into std.
5412 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
5413 just a wrapper around it).
5414 * std: The `Either` type has been removed.
5415 * std: `fmt::Default` can be implemented for any type to provide default
5416 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
5417 * std: The `rand` API continues to be tweaked.
5418 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
5419 on failure in gdb, is now named `rust_fail`.
5420 * std: The `each_key` and `each_value` methods on `HashMap` have been
5421 replaced by the `keys` and `values` iterators.
5422 * std: Functions dealing with type size and alignment have moved from the
5423 `sys` module to the `mem` module.
5424 * std: The `path` module was written and API changed.
5425 * std: `str::from_utf8` has been changed to cast instead of allocate.
5426 * std: `starts_with` and `ends_with` methods added to vectors via the
5427 `ImmutableEqVector` trait, which is in the prelude.
5428 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
5429 if the index is out of bounds.
5430 * std: Task failure no longer propagates between tasks, as the model was
5431 complex, expensive, and incompatible with thread-based tasks.
5432 * std: The `Any` type can be used for dynamic typing.
5433 * std: `~Any` can be passed to the `fail!` macro and retrieved via
5435 * std: Methods that produce iterators generally do not have an `_iter`
5437 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
5438 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
5439 * std: `util::ignore` renamed to `prelude::drop`.
5440 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
5442 * std: `vec::raw` has seen a lot of cleanup and API changes.
5443 * std: The standard library no longer includes any C++ code, and very
5444 minimal C, eliminating the dependency on libstdc++.
5445 * std: Runtime scheduling and I/O functionality has been factored out into
5446 extensible interfaces and is now implemented by two different crates:
5447 libnative, for native threading and I/O; and libgreen, for green threading
5448 and I/O. This paves the way for using the standard library in more limited
5449 embedded environments.
5450 * std: The `comm` module has been rewritten to be much faster, have a
5451 simpler, more consistent API, and to work for both native and green
5453 * std: All libuv dependencies have been moved into the rustuv crate.
5454 * native: New implementations of runtime scheduling on top of OS threads.
5455 * native: New native implementations of TCP, UDP, file I/O, process spawning,
5457 * green: The green thread scheduler and message passing types are almost
5459 * extra: The `flatpipes` module had bitrotted and was removed.
5460 * extra: All crypto functions have been removed and Rust now has a policy of
5461 not reimplementing crypto in the standard library. In the future crypto
5462 will be provided by external crates with bindings to established libraries.
5463 * extra: `c_vec` has been modernized.
5464 * extra: The `sort` module has been removed. Use the `sort` method on
5468 * The `rust` and `rusti` commands have been removed, due to lack of
5470 * `rustdoc` was completely rewritten.
5471 * `rustdoc` can test code examples in documentation.
5472 * `rustpkg` can test packages with the argument, 'test'.
5473 * `rustpkg` supports arbitrary dependencies, including C libraries.
5474 * `rustc`'s support for generating debug info is improved again.
5475 * `rustc` has better error reporting for unbalanced delimiters.
5476 * `rustc`'s JIT support was removed due to bitrot.
5477 * Executables and static libraries can be built with LTO (-Z lto)
5478 * `rustc` adds a `--dep-info` flag for communicating dependencies to
5482 Version 0.8 (2013-09-26)
5483 ============================
5485 * ~2200 changes, numerous bugfixes
5488 * The `for` loop syntax has changed to work with the `Iterator` trait.
5489 * At long last, unwinding works on Windows.
5490 * Default methods are ready for use.
5491 * Many trait inheritance bugs fixed.
5492 * Owned and borrowed trait objects work more reliably.
5493 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
5494 * rustc can omit emission of code for the `debug!` macro if it is passed
5496 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
5497 for foo.rs, then foo/mod.rs, and will generate an error when both are
5499 * Strings no longer contain trailing nulls. The new `std::c_str` module
5500 provides new mechanisms for converting to C strings.
5501 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
5502 * The FFI has been overhauled such that foreign functions are called directly,
5503 instead of through a stack-switching wrapper.
5504 * Calling a foreign function must be done through a Rust function with the
5505 `#[fixed_stack_segment]` attribute.
5506 * The `externfn!` macro can be used to declare both a foreign function and
5507 a `#[fixed_stack_segment]` wrapper at once.
5508 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
5509 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
5510 * `priv` is disallowed everywhere except for struct fields and enum variants.
5511 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
5512 * `ref` bindings in irrefutable patterns work correctly now.
5513 * `char` is now prevented from containing invalid code points.
5514 * Casting to `bool` is no longer allowed.
5515 * `\0` is now accepted as an escape in chars and strings.
5516 * `yield` is a reserved keyword.
5517 * `typeof` is a reserved keyword.
5518 * Crates may be imported by URL with `extern mod foo = "url";`.
5519 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
5520 * Static vectors can be initialized with repeating elements,
5521 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
5522 * Static structs can be initialized with functional record update,
5523 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
5524 * `cfg!` can be used to conditionally execute code based on the crate
5525 configuration, similarly to `#[cfg(...)]`.
5526 * The `unnecessary_qualification` lint detects unneeded module
5527 prefixes (default: allow).
5528 * Arithmetic operations have been implemented on the SIMD types in
5529 `std::unstable::simd`.
5530 * Exchange allocation headers were removed, reducing memory usage.
5531 * `format!` implements a completely new, extensible, and higher-performance
5532 string formatting system. It will replace `fmt!`.
5533 * `print!` and `println!` write formatted strings (using the `format!`
5534 extension) to stdout.
5535 * `write!` and `writeln!` write formatted strings (using the `format!`
5536 extension) to the new Writers in `std::rt::io`.
5537 * The library section in which a function or static is placed may
5538 be specified with `#[link_section = "..."]`.
5539 * The `proto!` syntax extension for defining bounded message protocols
5541 * `macro_rules!` is hygienic for `let` declarations.
5542 * The `#[export_name]` attribute specifies the name of a symbol.
5543 * `unreachable!` can be used to indicate unreachable code, and fails
5547 * std: Transitioned to the new runtime, written in Rust.
5548 * std: Added an experimental I/O library, `rt::io`, based on the new
5550 * std: A new generic `range` function was added to the prelude, replacing
5551 `uint::range` and friends.
5552 * std: `range_rev` no longer exists. Since range is an iterator it can be
5553 reversed with `range(lo, hi).invert()`.
5554 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
5555 renamed to `unwrap_or`.
5556 * std: The `iterator` module was renamed to `iter`.
5557 * std: Integral types now support the `checked_add`, `checked_sub`, and
5558 `checked_mul` operations for detecting overflow.
5559 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
5561 * std: Methods are standardizing on conventions for casting methods:
5562 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
5564 * std: The `CString` type in `c_str` provides new ways to convert to and
5566 * std: `DoubleEndedIterator` can yield elements in two directions.
5567 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
5569 * std: `str::from_bytes` renamed to `str::from_utf8`.
5570 * std: `pop_opt` and `shift_opt` methods added to vectors.
5571 * std: The task-local data interface no longer uses @, and keys are
5572 no longer function pointers.
5573 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
5574 * std: Added `SharedPort` to `comm`.
5575 * std: `Eq` has a default method for `ne`; only `eq` is required
5577 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
5578 is required in implementations.
5579 * std: `is_utf8` performance is improved, impacting many string functions.
5580 * std: `os::MemoryMap` provides cross-platform mmap.
5581 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
5582 are not 'in-bounds' are considered undefined.
5583 * std: Many freestanding functions in `vec` removed in favor of methods.
5584 * std: Many freestanding functions on scalar types removed in favor of
5586 * std: Many options to task builders were removed since they don't make
5587 sense in the new scheduler design.
5588 * std: More containers implement `FromIterator` so can be created by the
5590 * std: More complete atomic types in `unstable::atomics`.
5591 * std: `comm::PortSet` removed.
5592 * std: Mutating methods in the `Set` and `Map` traits have been moved into
5593 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
5594 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
5595 default implementations.
5596 * std: Various `from_str` functions were removed in favor of a generic
5597 `from_str` which is available in the prelude.
5598 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
5599 * extra: `dlist`, the doubly-linked list was modernized.
5600 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
5601 * extra: Added `glob` module, replacing `std::os::glob`.
5602 * extra: `rope` was removed.
5603 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
5604 * extra: `net`, and `timer` were removed. The experimental replacements
5605 are `std::rt::io::net` and `std::rt::io::timer`.
5606 * extra: Iterators implemented for `SmallIntMap`.
5607 * extra: Iterators implemented for `Bitv` and `BitvSet`.
5608 * extra: `SmallIntSet` removed. Use `BitvSet`.
5609 * extra: Performance of JSON parsing greatly improved.
5610 * extra: `semver` updated to SemVer 2.0.0.
5611 * extra: `term` handles more terminals correctly.
5612 * extra: `dbg` module removed.
5613 * extra: `par` module removed.
5614 * extra: `future` was cleaned up, with some method renames.
5615 * extra: Most free functions in `getopts` were converted to methods.
5618 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
5619 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
5620 similarly to gcc's `--march` flag.
5621 * rustc's performance compiling small crates is much better.
5622 * rustpkg has received many improvements.
5623 * rustpkg supports git tags as package IDs.
5624 * rustpkg builds into target-specific directories so it can be used for
5626 * The number of concurrent test tasks is controlled by the environment
5627 variable RUST_TEST_TASKS.
5628 * The test harness can now report metrics for benchmarks.
5629 * All tools have man pages.
5630 * Programs compiled with `--test` now support the `-h` and `--help` flags.
5631 * The runtime uses jemalloc for allocations.
5632 * Segmented stacks are temporarily disabled as part of the transition to
5633 the new runtime. Stack overflows are possible!
5634 * A new documentation backend, rustdoc_ng, is available for use. It is
5635 still invoked through the normal `rustdoc` command.
5638 Version 0.7 (2013-07-03)
5639 =======================
5641 * ~2000 changes, numerous bugfixes
5644 * `impl`s no longer accept a visibility qualifier. Put them on methods
5646 * The borrow checker has been rewritten with flow-sensitivity, fixing
5647 many bugs and inconveniences.
5648 * The `self` parameter no longer implicitly means `&'self self`,
5649 and can be explicitly marked with a lifetime.
5650 * Overloadable compound operators (`+=`, etc.) have been temporarily
5651 removed due to bugs.
5652 * The `for` loop protocol now requires `for`-iterators to return `bool`
5653 so they compose better.
5654 * The `Durable` trait is replaced with the `'static` bounds.
5655 * Trait default methods work more often.
5656 * Structs with the `#[packed]` attribute have byte alignment and
5657 no padding between fields.
5658 * Type parameters bound by `Copy` must now be copied explicitly with
5660 * It is now illegal to move out of a dereferenced unsafe pointer.
5661 * `Option<~T>` is now represented as a nullable pointer.
5662 * `@mut` does dynamic borrow checks correctly.
5663 * The `main` function is only detected at the topmost level of the crate.
5664 The `#[main]` attribute is still valid anywhere.
5665 * Struct fields may no longer be mutable. Use inherited mutability.
5666 * The `#[no_send]` attribute makes a type that would otherwise be
5668 * The `#[no_freeze]` attribute makes a type that would otherwise be
5670 * Unbounded recursion will abort the process after reaching the limit
5671 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
5672 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
5673 are never implicitly copyable.
5674 * `#[static_assert]` makes compile-time assertions about static bools.
5675 * At long last, 'argument modes' no longer exist.
5676 * The rarely used `use mod` statement no longer exists.
5679 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
5681 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
5682 `Rand`, `Zero` and `ToStr` can all be automatically derived with
5684 * The `bytes!` macro returns a vector of bytes for string, u8, char,
5685 and unsuffixed integer literals.
5688 * The `core` crate was renamed to `std`.
5689 * The `std` crate was renamed to `extra`.
5690 * More and improved documentation.
5691 * std: `iterator` module for external iterator objects.
5692 * Many old-style (internal, higher-order function) iterators replaced by
5693 implementations of `Iterator`.
5694 * std: Many old internal vector and string iterators,
5695 incl. `any`, `all`. removed.
5696 * std: The `finalize` method of `Drop` renamed to `drop`.
5697 * std: The `drop` method now takes `&mut self` instead of `&self`.
5698 * std: The prelude no longer re-exports any modules, only types and traits.
5699 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
5700 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
5701 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
5702 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
5703 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
5704 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
5705 * std: Many types implement `Clone`.
5706 * std: `path` type renamed to `Path`.
5707 * std: `mut` module and `Mut` type removed.
5708 * std: Many standalone functions removed in favor of methods and iterators
5709 in `vec`, `str`. In the future methods will also work as functions.
5710 * std: `reinterpret_cast` removed. Use `transmute`.
5711 * std: ascii string handling in `std::ascii`.
5712 * std: `Rand` is implemented for ~/@.
5713 * std: `run` module for spawning processes overhauled.
5714 * std: Various atomic types added to `unstable::atomic`.
5715 * std: Various types implement `Zero`.
5716 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
5717 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
5718 * std: Added `os::mkdir_recursive`.
5719 * std: Added `os::glob` function performs filesystems globs.
5720 * std: `FuzzyEq` renamed to `ApproxEq`.
5721 * std: `Map` now defines `pop` and `swap` methods.
5722 * std: `Cell` constructors converted to static methods.
5723 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
5724 * extra: `flate` module moved from `std` to `extra`.
5725 * extra: `fileinput` module for iterating over a series of files.
5726 * extra: `Complex` number type and `complex` module.
5727 * extra: `Rational` number type and `rational` module.
5728 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
5729 * extra: `term` uses terminfo now, is more correct.
5730 * extra: `arc` functions converted to methods.
5731 * extra: Implementation of fixed output size variations of SHA-2.
5734 * `unused_variable` lint mode for unused variables (default: warn).
5735 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
5737 * `unused_mut` lint mode for identifying unused `mut` qualifiers
5739 * `dead_assignment` lint mode for unread variables (default: warn).
5740 * `unnecessary_allocation` lint mode detects some heap allocations that are
5741 immediately borrowed so could be written without allocating (default: warn).
5742 * `missing_doc` lint mode (default: allow).
5743 * `unreachable_code` lint mode (default: warn).
5744 * The `rusti` command has been rewritten and a number of bugs addressed.
5745 * rustc outputs in color on more terminals.
5746 * rustc accepts a `--link-args` flag to pass arguments to the linker.
5747 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
5748 * Compiling with `-g` will make the binary record information about
5749 dynamic borrowcheck failures for debugging.
5750 * rustdoc has a nicer stylesheet.
5751 * Various improvements to rustdoc.
5752 * Improvements to rustpkg (see the detailed release notes).
5755 Version 0.6 (2013-04-03)
5756 ========================
5758 * ~2100 changes, numerous bugfixes
5761 * The self type parameter in traits is now spelled `Self`
5762 * The `self` parameter in trait and impl methods must now be explicitly
5763 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
5764 * Static methods no longer require the `static` keyword and instead
5765 are distinguished by the lack of a `self` parameter
5766 * Replaced the `Durable` trait with the `'static` lifetime
5767 * The old closure type syntax with the trailing sigil has been
5768 removed in favor of the more consistent leading sigil
5769 * `super` is a keyword, and may be prefixed to paths
5770 * Trait bounds are separated with `+` instead of whitespace
5771 * Traits are implemented with `impl Trait for Type`
5772 instead of `impl Type: Trait`
5773 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
5774 * The `export` keyword has finally been removed
5775 * The `move` keyword has been removed (see "Semantic changes")
5776 * The interior mutability qualifier on vectors, `[mut T]`, has been
5777 removed. Use `&mut [T]`, etc.
5778 * `mut` is no longer valid in `~mut T`. Use inherited mutability
5779 * `fail` is no longer a keyword. Use `fail!()`
5780 * `assert` is no longer a keyword. Use `assert!()`
5781 * `log` is no longer a keyword. use `debug!`, etc.
5782 * 1-tuples may be represented as `(T,)`
5783 * Struct fields may no longer be `mut`. Use inherited mutability,
5784 `@mut T`, `core::mut` or `core::cell`
5785 * `extern mod { ... }` is no longer valid syntax for foreign
5786 function modules. Use extern blocks: `extern { ... }`
5787 * Newtype enums removed. Use tuple-structs.
5788 * Trait implementations no longer support visibility modifiers
5789 * Pattern matching over vectors improved and expanded
5790 * `const` renamed to `static` to correspond to lifetime name,
5791 and make room for future `static mut` unsafe mutable globals.
5792 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
5793 * `Clone` implementations can be automatically generated with
5794 `#[deriving(Clone)]`
5795 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
5796 instead of `foo as Bar`.
5797 * Fixed length vector types are now written as `[int, .. 3]`
5798 instead of `[int * 3]`.
5799 * Fixed length vector types can express the length as a constant
5800 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
5803 * Types with owned pointers or custom destructors move by default,
5804 eliminating the `move` keyword
5805 * All foreign functions are considered unsafe
5806 * &mut is now unaliasable
5807 * Writes to borrowed @mut pointers are prevented dynamically
5809 * The name of the main function can be customized using #[main]
5810 * The default type of an inferred closure is &fn instead of @fn
5811 * `use` statements may no longer be "chained" - they cannot import
5812 identifiers imported by previous `use` statements
5813 * `use` statements are crate relative, importing from the "top"
5814 of the crate by default. Paths may be prefixed with `super::`
5815 or `self::` to change the search behavior.
5816 * Method visibility is inherited from the implementation declaration
5817 * Structural records have been removed
5818 * Many more types can be used in static items, including enums
5819 'static-lifetime pointers and vectors
5820 * Pattern matching over vectors improved and expanded
5821 * Typechecking of closure types has been overhauled to
5822 improve inference and eliminate unsoundness
5823 * Macros leave scope at the end of modules, unless that module is
5824 tagged with #[macro_escape]
5827 * Added big integers to `std::bigint`
5828 * Removed `core::oldcomm` module
5829 * Added pipe-based `core::comm` module
5830 * Numeric traits have been reorganized under `core::num`
5831 * `vec::slice` finally returns a slice
5832 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
5833 * Containers reorganized around traits in `core::container`
5834 * `core::dvec` removed, `~[T]` is a drop-in replacement
5835 * `core::send_map` renamed to `core::hashmap`
5836 * `std::map` removed; replaced with `core::hashmap`
5837 * `std::treemap` reimplemented as an owned balanced tree
5838 * `std::deque` and `std::smallintmap` reimplemented as owned containers
5839 * `core::trie` added as a fast ordered map for integer keys
5840 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
5841 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
5842 overload the comparison operators, whereas `TotalOrd` is used
5843 by certain container types
5846 * Replaced the 'cargo' package manager with 'rustpkg'
5847 * Added all-purpose 'rust' tool
5848 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
5849 * rustc now *attempts* to offer spelling suggestions
5850 * Improved support for ARM and Android
5851 * Preliminary MIPS backend
5852 * Improved foreign function ABI implementation for x86, x86_64
5853 * Various memory usage improvements
5854 * Rust code may be embedded in foreign code under limited circumstances
5855 * Inline assembler supported by new asm!() syntax extension.
5858 Version 0.5 (2012-12-21)
5859 ===========================
5861 * ~900 changes, numerous bugfixes
5864 * Removed `<-` move operator
5865 * Completed the transition from the `#fmt` extension syntax to `fmt!`
5866 * Removed old fixed length vector syntax - `[T]/N`
5867 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
5868 * Macros may now expand to items and statements
5869 * `a.b()` is always parsed as a method call, never as a field projection
5870 * `Eq` and `IterBytes` implementations can be automatically generated
5871 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
5872 * Removed the special crate language for `.rc` files
5873 * Function arguments may consist of any irrefutable pattern
5876 * `&` and `~` pointers may point to objects
5877 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
5878 * Enum variants may be structs
5879 * Destructors can be added to all nominal types with the Drop trait
5880 * Structs and nullary enum variants may be constants
5881 * Values that cannot be implicitly copied are now automatically moved
5882 without writing `move` explicitly
5883 * `&T` may now be coerced to `*T`
5884 * Coercions happen in `let` statements as well as function calls
5885 * `use` statements now take crate-relative paths
5886 * The module and type namespaces have been merged so that static
5887 method names can be resolved under the trait in which they are
5890 * Improved support for language features
5891 * Trait inheritance works in many scenarios
5892 * More support for explicit self arguments in methods - `self`, `&self`
5893 `@self`, and `~self` all generally work as expected
5894 * Static methods work in more situations
5895 * Experimental: Traits may declare default methods for the implementations
5899 * New condition handling system in `core::condition`
5900 * Timsort added to `std::sort`
5901 * New priority queue, `std::priority_queue`
5902 * Pipes for serializable types, `std::flatpipes'
5903 * Serialization overhauled to be trait-based
5904 * Expanded `getopts` definitions
5905 * Moved futures to `std`
5906 * More functions are pure now
5907 * `core::comm` renamed to `oldcomm`. Still deprecated
5908 * `rustdoc` and `cargo` are libraries now
5911 * Added a preliminary REPL, `rusti`
5912 * License changed from MIT to dual MIT/APL2
5915 Version 0.4 (2012-10-15)
5916 ==========================
5918 * ~2000 changes, numerous bugfixes
5921 * All keywords are now strict and may not be used as identifiers anywhere
5922 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
5923 'of', 'with', 'to', 'class'.
5924 * Classes are replaced with simpler structs
5925 * Explicit method self types
5926 * `ret` became `return` and `alt` became `match`
5927 * `import` is now `use`; `use is now `extern mod`
5928 * `extern mod { ... }` is now `extern { ... }`
5929 * `use mod` is the recommended way to import modules
5930 * `pub` and `priv` replace deprecated export lists
5931 * The syntax of `match` pattern arms now uses fat arrow (=>)
5932 * `main` no longer accepts an args vector; use `os::args` instead
5935 * Trait implementations are now coherent, ala Haskell typeclasses
5936 * Trait methods may be static
5937 * Argument modes are deprecated
5938 * Borrowed pointers are much more mature and recommended for use
5939 * Strings and vectors in the static region are stored in constant memory
5940 * Typestate was removed
5941 * Resolution rewritten to be more reliable
5942 * Support for 'dual-mode' data structures (freezing and thawing)
5945 * Most binary operators can now be overloaded via the traits in
5947 * `std::net::url` for representing URLs
5948 * Sendable hash maps in `core::send_map`
5949 * `core::task' gained a (currently unsafe) task-local storage API
5952 * An efficient new intertask communication primitive called the pipe,
5953 along with a number of higher-level channel types, in `core::pipes`
5954 * `std::arc`, an atomically reference counted, immutable, shared memory
5956 * `std::sync`, various exotic synchronization tools based on arcs and pipes
5957 * Futures are now based on pipes and sendable
5958 * More robust linked task failure
5959 * Improved task builder API
5962 * Improved error reporting
5963 * Preliminary JIT support
5964 * Preliminary work on precise GC
5965 * Extensive architectural improvements to rustc
5966 * Begun a transition away from buggy C++-based reflection (shape) code to
5967 Rust-based (visitor) code
5968 * All hash functions and tables converted to secure, randomized SipHash
5971 Version 0.3 (2012-07-12)
5972 ========================
5974 * ~1900 changes, numerous bugfixes
5976 * New coding conveniences
5977 * Integer-literal suffix inference
5978 * Per-item control over warnings, errors
5979 * #[cfg(windows)] and #[cfg(unix)] attributes
5980 * Documentation comments
5981 * More compact closure syntax
5982 * 'do' expressions for treating higher-order functions as
5984 * *-patterns (wildcard extended to all constructor fields)
5987 * Name resolution pass and exhaustiveness checker rewritten
5988 * Region pointers and borrow checking supersede alias
5990 * Init-ness checking is now provided by a region-based liveness
5991 pass instead of the typestate pass; same for last-use analysis
5992 * Extensive work on region pointers
5994 * Experimental new language features
5995 * Slices and fixed-size, interior-allocated vectors
5996 * #!-comments for lang versioning, shell execution
5997 * Destructors and iface implementation for classes;
5998 type-parameterized classes and class methods
5999 * 'const' type kind for types that can be used to implement
6000 shared-memory concurrency patterns
6004 * Removal of various obsolete features
6005 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6006 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6008 * Constructs: do-while loops ('do' repurposed), fn binding,
6009 resources (replaced by destructors)
6011 * Compiler reorganization
6012 * Syntax-layer of compiler split into separate crate
6013 * Clang (from LLVM project) integrated into build
6014 * Typechecker split into sub-modules
6017 * New time functions
6018 * Extension methods for many built-in types
6019 * Arc: atomic-refcount read-only / exclusive-use shared cells
6020 * Par: parallel map and search routines
6021 * Extensive work on libuv interface
6022 * Much vector code moved to libraries
6023 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6024 #include, #include_str, #include_bin
6027 * Cargo automatically resolves dependencies
6030 Version 0.2 (2012-03-29)
6031 =========================
6033 * >1500 changes, numerous bugfixes
6035 * New docs and doc tooling
6037 * New port: FreeBSD x86_64
6039 * Compilation model enhancements
6040 * Generics now specialized, multiply instantiated
6041 * Functions now inlined across separate crates
6043 * Scheduling, stack and threading fixes
6044 * Noticeably improved message-passing performance
6045 * Explicit schedulers
6049 * Experimental new language features
6050 * Operator overloading
6054 * Various language extensions
6055 * C-callback function types: 'crust fn ...'
6056 * Infinite-loop construct: 'loop { ... }'
6057 * Shorten 'mutable' to 'mut'
6058 * Required mutable-local qualifier: 'let mut ...'
6059 * Basic glob-exporting: 'export foo::*;'
6060 * Alt now exhaustive, 'alt check' for runtime-checked
6061 * Block-function form of 'for' loop, with 'break' and 'ret'.
6064 * AST quasi-quote syntax extension
6065 * Revived libuv interface
6066 * New modules: core::{future, iter}, std::arena
6067 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6068 * Extensive cleanup, regularization in libstd, libcore
6071 Version 0.1 (2012-01-20)
6072 ===============================
6074 * Most language features work, including:
6075 * Unique pointers, unique closures, move semantics
6076 * Interface-constrained generics
6077 * Static interface dispatch
6079 * Multithread task scheduling
6080 * Typestate predicates
6081 * Failure unwinding, destructors
6082 * Pattern matching and destructuring assignment
6083 * Lightweight block-lambda syntax
6084 * Preliminary macro-by-example
6086 * Compiler works with the following configurations:
6087 * Linux: x86 and x86_64 hosts and targets
6088 * macOS: x86 and x86_64 hosts and targets
6089 * Windows: x86 hosts and targets
6091 * Cross compilation / multi-target configuration supported.
6093 * Preliminary API-documentation and package-management tools included.
6097 * Documentation is incomplete.
6099 * Performance is below intended target.
6101 * Standard library APIs are subject to extensive change, reorganization.
6103 * Language-level versioning is not yet operational - future code will