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<T>>`][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]
50 - [`Duration::from_micros`][47300]
51 - [`Duration::from_nanos`][47300]
55 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
56 - [`cargo new` now defaults to creating a binary crate, instead of a
57 library crate.][cargo/5029]
61 - [Rust by example is now shipped with new releases][46196]
65 - [Deprecated `net::lookup_host`.][47510]
66 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
67 - The borrow checker was sometimes incorrectly permitting overlapping borrows
68 around indexing operations (see [#47349][47349]). This has been fixed (which also
69 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
70 - [Removed deprecated unstable attribute `#[simd]`.][47251]
72 [33903]: https://github.com/rust-lang/rust/pull/33903
73 [47947]: https://github.com/rust-lang/rust/pull/47947
74 [47948]: https://github.com/rust-lang/rust/pull/47948
75 [47760]: https://github.com/rust-lang/rust/pull/47760
76 [47790]: https://github.com/rust-lang/rust/pull/47790
77 [47828]: https://github.com/rust-lang/rust/pull/47828
78 [47398]: https://github.com/rust-lang/rust/pull/47398
79 [47510]: https://github.com/rust-lang/rust/pull/47510
80 [47521]: https://github.com/rust-lang/rust/pull/47521
81 [47204]: https://github.com/rust-lang/rust/pull/47204
82 [47251]: https://github.com/rust-lang/rust/pull/47251
83 [47268]: https://github.com/rust-lang/rust/pull/47268
84 [47282]: https://github.com/rust-lang/rust/pull/47282
85 [47300]: https://github.com/rust-lang/rust/pull/47300
86 [47349]: https://github.com/rust-lang/rust/pull/47349
87 [46931]: https://github.com/rust-lang/rust/pull/46931
88 [46985]: https://github.com/rust-lang/rust/pull/46985
89 [47006]: https://github.com/rust-lang/rust/pull/47006
90 [46830]: https://github.com/rust-lang/rust/pull/46830
91 [46095]: https://github.com/rust-lang/rust/pull/46095
92 [46666]: https://github.com/rust-lang/rust/pull/46666
93 [46196]: https://github.com/rust-lang/rust/pull/46196
94 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
95 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
96 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
97 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
98 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
101 Version 1.24.1 (2018-03-01)
102 ==========================
104 - [Do not abort when unwinding through FFI][48251]
105 - [Emit UTF-16 files for linker arguments on Windows][48318]
106 - [Make the error index generator work again][48308]
107 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
109 [48251]: https://github.com/rust-lang/rust/issues/48251
110 [48308]: https://github.com/rust-lang/rust/issues/48308
111 [48318]: https://github.com/rust-lang/rust/issues/48318
112 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
115 Version 1.24.0 (2018-02-15)
116 ==========================
120 - [External `sysv64` ffi is now available.][46528]
121 eg. `extern "sysv64" fn foo () {}`
125 - [rustc now uses 16 codegen units by default for release builds.][46910]
126 For the fastest builds, utilize `codegen-units=1`.
127 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
128 - [Add `aarch64-unknown-openbsd` support][46760]
132 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
133 improvement in performance in the majority of cases.
134 - [`OsStr`'s `Debug` implementation is now lossless and consistent
135 with Windows.][46798]
136 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
137 - [impl `From<bool>` for `AtomicBool`][46293]
138 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
139 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
140 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
141 - [float::from_bits now just uses transmute.][46012] This provides
142 some optimisations from LLVM.
143 - [Copied `AsciiExt` methods onto `char`][46077]
144 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
145 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
146 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
147 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
151 - [`RefCell::replace`]
153 - [`atomic::spin_loop_hint`]
155 The following functions can now be used in a constant expression.
156 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
158 - [`AtomicBool::new`][46287]
159 - [`AtomicUsize::new`][46287]
160 - [`AtomicIsize::new`][46287]
161 - [`AtomicPtr::new`][46287]
162 - [`Cell::new`][46287]
163 - [`{integer}::min_value`][46287]
164 - [`{integer}::max_value`][46287]
165 - [`mem::size_of`][46287]
166 - [`mem::align_of`][46287]
167 - [`ptr::null`][46287]
168 - [`ptr::null_mut`][46287]
169 - [`RefCell::new`][46287]
170 - [`UnsafeCell::new`][46287]
174 - [Added a `workspace.default-members` config that
175 overrides implied `--all` in virtual workspaces.][cargo/4743]
176 - [Enable incremental by default on development builds.][cargo/4817] Also added
177 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
178 per-project or global basis respectively.
185 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
186 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
187 in accordance with IETF RFC 4291 ยง2.2.
188 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
189 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
190 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
191 - [Leading zeros in tuple struct members is now an error][47084]
192 - [`column!()` macro is one-based instead of zero-based][46977]
193 - [`fmt::Arguments` can no longer be shared across threads][45198]
194 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
195 - [Cargo sets a different working directory for the compiler][cargo/4788]
197 [44884]: https://github.com/rust-lang/rust/pull/44884
198 [45198]: https://github.com/rust-lang/rust/pull/45198
199 [45506]: https://github.com/rust-lang/rust/pull/45506
200 [45904]: https://github.com/rust-lang/rust/pull/45904
201 [45990]: https://github.com/rust-lang/rust/pull/45990
202 [46012]: https://github.com/rust-lang/rust/pull/46012
203 [46077]: https://github.com/rust-lang/rust/pull/46077
204 [46094]: https://github.com/rust-lang/rust/pull/46094
205 [46284]: https://github.com/rust-lang/rust/pull/46284
206 [46287]: https://github.com/rust-lang/rust/pull/46287
207 [46293]: https://github.com/rust-lang/rust/pull/46293
208 [46528]: https://github.com/rust-lang/rust/pull/46528
209 [46671]: https://github.com/rust-lang/rust/pull/46671
210 [46713]: https://github.com/rust-lang/rust/pull/46713
211 [46735]: https://github.com/rust-lang/rust/pull/46735
212 [46749]: https://github.com/rust-lang/rust/pull/46749
213 [46760]: https://github.com/rust-lang/rust/pull/46760
214 [46798]: https://github.com/rust-lang/rust/pull/46798
215 [46828]: https://github.com/rust-lang/rust/pull/46828
216 [46831]: https://github.com/rust-lang/rust/pull/46831
217 [46833]: https://github.com/rust-lang/rust/pull/46833
218 [46910]: https://github.com/rust-lang/rust/pull/46910
219 [46977]: https://github.com/rust-lang/rust/pull/46977
220 [47018]: https://github.com/rust-lang/rust/pull/47018
221 [47080]: https://github.com/rust-lang/rust/pull/47080
222 [47084]: https://github.com/rust-lang/rust/pull/47084
223 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
224 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
225 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
226 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
227 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
228 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
231 Version 1.23.0 (2018-01-04)
232 ==========================
236 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
237 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
238 Which should fix some confusing errors in some operations.
242 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
243 undefined behaviour.][45920]
244 - [rustc now suggests renaming import if names clash.][45660]
245 - [Display errors/warnings correctly when there are zero-width or
246 wide characters.][45711]
247 - [rustc now avoids unnecessary copies of arguments that are
248 simple bindings][45380] This should improve memory usage on average by 5-10%.
249 - [Updated musl used to build musl rustc to 1.1.17][45393]
253 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
254 - [Implement Hash for raw pointers to unsized types][45483]
255 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
256 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
257 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
258 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
259 and `<*mut T>::as_mut`][44932]
260 - [Optimized `Thread::{park, unpark}` implementation][45524]
261 - [Improved `SliceExt::binary_search` performance.][45333]
262 - [impl `FromIterator<()>` for `()`][45379]
263 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
271 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
272 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
273 - [Added unit test checking to `cargo check`][cargo/4592]
274 - [Cargo now lets you install a specific version
275 using `cargo install --version`][cargo/4637]
279 - [Releases now ship with the Cargo book documentation.][45692]
280 - [rustdoc now prints rendering warnings on every run.][45324]
284 - [Changes have been made to type equality to make it more correct,
285 in rare cases this could break some code.][45853] [Tracking issue for
286 further information][45852]
287 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
288 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
289 Android 9, the minimum supported version is Android 14.
290 - [Bumped the minimum LLVM to 3.9][45326]
292 [44042]: https://github.com/rust-lang/rust/pull/44042
293 [44932]: https://github.com/rust-lang/rust/pull/44932
294 [45267]: https://github.com/rust-lang/rust/pull/45267
295 [45324]: https://github.com/rust-lang/rust/pull/45324
296 [45326]: https://github.com/rust-lang/rust/pull/45326
297 [45333]: https://github.com/rust-lang/rust/pull/45333
298 [45379]: https://github.com/rust-lang/rust/pull/45379
299 [45380]: https://github.com/rust-lang/rust/pull/45380
300 [45393]: https://github.com/rust-lang/rust/pull/45393
301 [45435]: https://github.com/rust-lang/rust/pull/45435
302 [45483]: https://github.com/rust-lang/rust/pull/45483
303 [45524]: https://github.com/rust-lang/rust/pull/45524
304 [45571]: https://github.com/rust-lang/rust/pull/45571
305 [45580]: https://github.com/rust-lang/rust/pull/45580
306 [45610]: https://github.com/rust-lang/rust/pull/45610
307 [45660]: https://github.com/rust-lang/rust/pull/45660
308 [45692]: https://github.com/rust-lang/rust/pull/45692
309 [45711]: https://github.com/rust-lang/rust/pull/45711
310 [45772]: https://github.com/rust-lang/rust/pull/45772
311 [45852]: https://github.com/rust-lang/rust/issues/45852
312 [45853]: https://github.com/rust-lang/rust/pull/45853
313 [45887]: https://github.com/rust-lang/rust/pull/45887
314 [45920]: https://github.com/rust-lang/rust/pull/45920
315 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
316 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
317 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
320 Version 1.22.1 (2017-11-22)
321 ==========================
323 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
325 [46183]: https://github.com/rust-lang/rust/pull/46183
327 Version 1.22.0 (2017-11-22)
328 ==========================
332 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
333 - [Now accepts underscores in unicode escapes][43716]
334 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
335 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
339 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
340 - [rustc will no longer inline in codegen units when compiling for debug][45075]
341 This should decrease compile times for debug builds.
342 - [strict memory alignment now enabled on ARMv6][45094]
343 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
347 - [Allow atomic operations up to 32 bits
348 on `armv5te_unknown_linux_gnueabi`][44978]
349 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
350 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
351 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
352 - [Properly detect overflow in `Instant += Duration`.][44220]
353 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
354 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
355 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
362 - [Cargo will now build multi file examples in subdirectories of the `examples`
363 folder that have a `main.rs` file.][cargo/4496]
364 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
365 the old format will continue to work and can be updated with `cargo update`.
366 - [Now supports vendoring git repositories][cargo/3992]
370 - [`libbacktrace` is now available on Apple platforms.][44251]
371 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
372 This now lets you specify that a given code example will fail to compile.
376 - [The minimum Android version that rustc can build for has been bumped
377 to `4.0` from `2.3`][45656]
378 - [Allowing `T op= &T` for numeric types has broken some type
379 inference cases][45480]
382 [42526]: https://github.com/rust-lang/rust/pull/42526
383 [43017]: https://github.com/rust-lang/rust/pull/43017
384 [43716]: https://github.com/rust-lang/rust/pull/43716
385 [43949]: https://github.com/rust-lang/rust/pull/43949
386 [44015]: https://github.com/rust-lang/rust/pull/44015
387 [44220]: https://github.com/rust-lang/rust/pull/44220
388 [44251]: https://github.com/rust-lang/rust/pull/44251
389 [44287]: https://github.com/rust-lang/rust/pull/44287
390 [44303]: https://github.com/rust-lang/rust/pull/44303
391 [44456]: https://github.com/rust-lang/rust/pull/44456
392 [44466]: https://github.com/rust-lang/rust/pull/44466
393 [44895]: https://github.com/rust-lang/rust/pull/44895
394 [44966]: https://github.com/rust-lang/rust/pull/44966
395 [44978]: https://github.com/rust-lang/rust/pull/44978
396 [45041]: https://github.com/rust-lang/rust/pull/45041
397 [45064]: https://github.com/rust-lang/rust/pull/45064
398 [45075]: https://github.com/rust-lang/rust/pull/45075
399 [45094]: https://github.com/rust-lang/rust/pull/45094
400 [45095]: https://github.com/rust-lang/rust/pull/45095
401 [45480]: https://github.com/rust-lang/rust/issues/45480
402 [45656]: https://github.com/rust-lang/rust/pull/45656
403 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
404 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
405 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
412 Version 1.21.0 (2017-10-12)
413 ==========================
417 - [You can now use static references for literals.][43838]
421 let x: &'static u32 = &0;
424 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
427 my_macro!(Vec<i32>::new); // Always worked
428 my_macro!(Vec::<i32>::new); // Now works
433 - [Upgraded jemalloc to 4.5.0][43911]
434 - [Enabled unwinding panics on Redox][43917]
435 - [Now runs LLVM in parallel during translation phase.][43506]
436 This should reduce peak memory usage.
440 - [Generate builtin impls for `Clone` for all arrays and tuples that
441 are `T: Clone`][43690]
442 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
443 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
444 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
449 [`std::mem::discriminant`]
453 - [You can now call `cargo install` with multiple package names][cargo/4216]
454 - [Cargo commands inside a virtual workspace will now implicitly
455 pass `--all`][cargo/4335]
456 - [Added a `[patch]` section to `Cargo.toml` to handle
457 prepublication dependencies][cargo/4123] [RFC 1969]
458 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
459 like patterns][cargo/4270]
460 - [Added the `--all-targets` option][cargo/4400]
461 - [Using required dependencies as a feature is now deprecated and emits
462 a warning][cargo/4364]
467 - [Cargo docs are moving][43916]
468 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
469 - [The rustdoc book is now available][43863]
470 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
471 - [Added a preview of RLS has been made available through rustup][44204]
472 Install with `rustup component add rls-preview`
473 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
474 Previously only showed `std::os::unix`.
478 - [Changes in method matching against higher-ranked types][43880] This may cause
479 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
480 - [rustc's JSON error output's byte position start at top of file.][42973]
481 Was previously relative to the rustc's internal `CodeMap` struct which
482 required the unstable library `libsyntax` to correctly use.
483 - [`unused_results` lint no longer ignores booleans][43728]
485 [42565]: https://github.com/rust-lang/rust/pull/42565
486 [42973]: https://github.com/rust-lang/rust/pull/42973
487 [43348]: https://github.com/rust-lang/rust/pull/43348
488 [43459]: https://github.com/rust-lang/rust/pull/43459
489 [43506]: https://github.com/rust-lang/rust/pull/43506
490 [43540]: https://github.com/rust-lang/rust/pull/43540
491 [43690]: https://github.com/rust-lang/rust/pull/43690
492 [43728]: https://github.com/rust-lang/rust/pull/43728
493 [43838]: https://github.com/rust-lang/rust/pull/43838
494 [43863]: https://github.com/rust-lang/rust/pull/43863
495 [43880]: https://github.com/rust-lang/rust/pull/43880
496 [43911]: https://github.com/rust-lang/rust/pull/43911
497 [43916]: https://github.com/rust-lang/rust/pull/43916
498 [43917]: https://github.com/rust-lang/rust/pull/43917
499 [44204]: https://github.com/rust-lang/rust/pull/44204
500 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
501 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
502 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
503 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
504 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
505 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
506 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
507 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
508 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
510 Version 1.20.0 (2017-08-31)
511 ===========================
515 - [Associated constants are now stabilised.][42809]
516 - [A lot of macro bugs are now fixed.][42913]
521 - [Struct fields are now properly coerced to the expected field type.][42807]
522 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
523 `wasm32-experimental-emscripten` target.
524 - [Changed some of the error messages to be more helpful.][42033]
525 - [Add support for RELRO(RELocation Read-Only) for platforms that support
527 - [rustc now reports the total number of errors on compilation failure][43015]
528 previously this was only the number of errors in the pass that failed.
529 - [Expansion in rustc has been sped up 29x.][42533]
530 - [added `msp430-none-elf` target.][43099]
531 - [rustc will now suggest one-argument enum variant to fix type mismatch when
533 - [Fixes backtraces on Redox][43228]
534 - [rustc now identifies different versions of same crate when absolute paths of
535 different types match in an error message.][42826]
541 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
542 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
544 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
545 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
546 - [Impl `Clone` for `DefaultHasher`.][42799]
547 - [Impl `Sync` for `SyncSender`.][42397]
548 - [Impl `FromStr` for `char`][42271]
549 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
551 - [allow messages in the `unimplemented!()` macro.][42155]
552 ie. `unimplemented!("Waiting for 1.21 to be stable")`
553 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
554 - [Upgrade to Unicode 10.0.0][42999]
555 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
556 - [Skip the main thread's manual stack guard on Linux][43072]
557 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
558 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
560 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
565 - [`CStr::into_c_string`]
566 - [`CString::as_c_str`]
567 - [`CString::into_boxed_c_str`]
570 - [`Chain::into_inner`]
571 - [`Option::get_or_insert_with`]
572 - [`Option::get_or_insert`]
573 - [`OsStr::into_os_string`]
574 - [`OsString::into_boxed_os_str`]
577 - [`Utf8Error::error_len`]
578 - [`char::EscapeDebug`]
579 - [`char::escape_debug`]
585 - [`mem::ManuallyDrop`]
586 - [`slice::sort_unstable_by_key`]
587 - [`slice::sort_unstable_by`]
588 - [`slice::sort_unstable`]
589 - [`str::from_boxed_utf8_unchecked`]
590 - [`str::as_bytes_mut`]
591 - [`str::as_bytes_mut`]
592 - [`str::from_utf8_mut`]
593 - [`str::from_utf8_unchecked_mut`]
595 - [`str::get_unchecked_mut`]
596 - [`str::get_unchecked`]
598 - [`str::into_boxed_bytes`]
603 - [Cargo API token location moved from `~/.cargo/config` to
604 `~/.cargo/credentials`.][cargo/3978]
605 - [Cargo will now build `main.rs` binaries that are in sub-directories of
606 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
607 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
608 - [You can now specify version of a binary when installed through
609 `cargo install` using `--vers`.][cargo/4229]
610 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
611 failure.][cargo/4248]
612 - [Changed the convention around which file is the crate root.][cargo/4259]
613 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
614 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
619 - [Functions with `'static` in their return types will now not be as usable as
620 if they were using lifetime parameters instead.][42417]
621 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
622 takes the sign of NaN into account where previously didn't.][42430]
624 [42033]: https://github.com/rust-lang/rust/pull/42033
625 [42155]: https://github.com/rust-lang/rust/pull/42155
626 [42271]: https://github.com/rust-lang/rust/pull/42271
627 [42397]: https://github.com/rust-lang/rust/pull/42397
628 [42417]: https://github.com/rust-lang/rust/pull/42417
629 [42430]: https://github.com/rust-lang/rust/pull/42430
630 [42431]: https://github.com/rust-lang/rust/pull/42431
631 [42533]: https://github.com/rust-lang/rust/pull/42533
632 [42571]: https://github.com/rust-lang/rust/pull/42571
633 [42613]: https://github.com/rust-lang/rust/pull/42613
634 [42799]: https://github.com/rust-lang/rust/pull/42799
635 [42807]: https://github.com/rust-lang/rust/pull/42807
636 [42809]: https://github.com/rust-lang/rust/pull/42809
637 [42822]: https://github.com/rust-lang/rust/pull/42822
638 [42826]: https://github.com/rust-lang/rust/pull/42826
639 [42854]: https://github.com/rust-lang/rust/pull/42854
640 [42913]: https://github.com/rust-lang/rust/pull/42913
641 [42999]: https://github.com/rust-lang/rust/pull/42999
642 [43011]: https://github.com/rust-lang/rust/pull/43011
643 [43015]: https://github.com/rust-lang/rust/pull/43015
644 [43072]: https://github.com/rust-lang/rust/pull/43072
645 [43077]: https://github.com/rust-lang/rust/pull/43077
646 [43097]: https://github.com/rust-lang/rust/pull/43097
647 [43099]: https://github.com/rust-lang/rust/pull/43099
648 [43170]: https://github.com/rust-lang/rust/pull/43170
649 [43178]: https://github.com/rust-lang/rust/pull/43178
650 [43185]: https://github.com/rust-lang/rust/pull/43185
651 [43228]: https://github.com/rust-lang/rust/pull/43228
652 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
653 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
654 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
655 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
656 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
657 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
658 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
659 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
660 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
661 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
662 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
663 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
664 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
665 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
666 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
667 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
668 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
669 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
670 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
671 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
672 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
673 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
674 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
675 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
676 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
677 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
678 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
679 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
680 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
681 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
682 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
683 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
684 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
685 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
686 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
687 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
688 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
689 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
690 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
693 Version 1.19.0 (2017-07-20)
694 ===========================
699 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
700 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
701 - [Macro recursion limit increased to 1024 from 64.][41676]
702 - [Added lint for detecting unused macros.][41907]
703 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
704 For example: `let x = loop { break 7; };`
705 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
706 contain `Copy` types and cannot have a `Drop` implementation.
707 Example: `union Foo { bar: u8, baz: usize }`
708 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
709 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
714 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
715 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
716 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
717 you should use `--target armv7-linux-androideabi`.
718 - [Fixed ICE when removing a source file between compilation sessions.][41873]
719 - [Minor optimisation of string operations.][42037]
720 - [Compiler error message is now `aborting due to previous error(s)` instead of
721 `aborting due to N previous errors`][42150] This was previously inaccurate and
722 would only count certain kinds of errors.
723 - [The compiler now supports Visual Studio 2017][42225]
724 - [The compiler is now built against LLVM 4.0.1 by default][42948]
725 - [Added a lot][42264] of [new error codes][42302]
726 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
727 libraries with C Run-time Libraries(CRT) to be statically linked.
728 - [Fixed various ARM codegen bugs][42740]
733 - [`String` now implements `FromIterator<Cow<'a, str>>` and
734 `Extend<Cow<'a, str>>`][41449]
735 - [`Vec` now implements `From<&mut [T]>`][41530]
736 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
737 - [`SplitWhitespace` now implements `Clone`][41659]
738 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
740 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
741 macros, but for printing to stderr.
746 - [`OsString::shrink_to_fit`]
749 - [`thread::ThreadId`]
754 - [Build scripts can now add environment variables to the environment
755 the crate is being compiled in.
756 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
757 - [Subcommands now replace the current process rather than spawning a new
758 child process][cargo/3970]
759 - [Workspace members can now accept glob file patterns][cargo/3979]
760 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
761 the members in a given workspace.][cargo/3988]
762 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
763 - [Target directory path is now in the cargo metadata][cargo/4022]
764 - [Cargo no longer checks out a local working directory for the
765 crates.io index][cargo/4026] This should provide smaller file size for the
766 registry, and improve cloning times, especially on Windows machines.
767 - [Added an `--exclude` option for excluding certain packages when using the
768 `--all` option][cargo/4031]
769 - [Cargo will now automatically retry when receiving a 5xx error
770 from crates.io][cargo/4032]
771 - [The `--features` option now accepts multiple comma or space
772 delimited values.][cargo/4084]
773 - [Added support for custom target specific runners][cargo/3954]
778 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
780 - [Rust will now release XZ compressed packages][rust-installer/57]
781 - [rustup will now prefer to download rust packages with
782 XZ compression][rustup/1100] over GZip packages.
783 - [Added the ability to escape `#` in rust documentation][41785] By adding
784 additional `#`'s ie. `##` is now `#`
789 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
790 - [`-Z` flags are now no longer allowed to be used on the stable
791 compiler.][41751] This has been a warning for a year previous to this.
792 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
793 longer works][42844]. Users should migrate to the built-in `check`
794 command, which has been available since 1.16.
795 - [Ending a float literal with `._` is now a hard error.
796 Example: `42._` .][41946]
797 - [Any use of a private `extern crate` outside of its module is now a
798 hard error.][36886] This was previously a warning.
799 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
800 relative while the `::` prefix makes a path absolute, but was ignored and the
801 path was relative regardless.
802 - [Floating point constants in match patterns is now a hard error][36890]
803 This was previously a warning.
804 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
805 match patterns is now a hard error][36891] This was previously a warning.
806 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
808 - [From the pound escape, lines consisting of multiple `#`s are
810 - [It is an error to re-export private enum variants][42460]. This is
811 known to break a number of crates that depend on an older version of
813 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
814 to use it to find the linker, and the build will fail where it did
815 not previously][42607]
817 [36886]: https://github.com/rust-lang/rust/issues/36886
818 [36888]: https://github.com/rust-lang/rust/issues/36888
819 [36890]: https://github.com/rust-lang/rust/issues/36890
820 [36891]: https://github.com/rust-lang/rust/issues/36891
821 [36892]: https://github.com/rust-lang/rust/issues/36892
822 [37406]: https://github.com/rust-lang/rust/issues/37406
823 [39983]: https://github.com/rust-lang/rust/pull/39983
824 [41145]: https://github.com/rust-lang/rust/pull/41145
825 [41192]: https://github.com/rust-lang/rust/pull/41192
826 [41258]: https://github.com/rust-lang/rust/pull/41258
827 [41370]: https://github.com/rust-lang/rust/pull/41370
828 [41449]: https://github.com/rust-lang/rust/pull/41449
829 [41530]: https://github.com/rust-lang/rust/pull/41530
830 [41624]: https://github.com/rust-lang/rust/pull/41624
831 [41656]: https://github.com/rust-lang/rust/pull/41656
832 [41659]: https://github.com/rust-lang/rust/pull/41659
833 [41676]: https://github.com/rust-lang/rust/pull/41676
834 [41751]: https://github.com/rust-lang/rust/pull/41751
835 [41764]: https://github.com/rust-lang/rust/pull/41764
836 [41785]: https://github.com/rust-lang/rust/pull/41785
837 [41873]: https://github.com/rust-lang/rust/pull/41873
838 [41907]: https://github.com/rust-lang/rust/pull/41907
839 [41946]: https://github.com/rust-lang/rust/pull/41946
840 [42016]: https://github.com/rust-lang/rust/pull/42016
841 [42037]: https://github.com/rust-lang/rust/pull/42037
842 [42068]: https://github.com/rust-lang/rust/pull/42068
843 [42150]: https://github.com/rust-lang/rust/pull/42150
844 [42162]: https://github.com/rust-lang/rust/pull/42162
845 [42225]: https://github.com/rust-lang/rust/pull/42225
846 [42264]: https://github.com/rust-lang/rust/pull/42264
847 [42302]: https://github.com/rust-lang/rust/pull/42302
848 [42460]: https://github.com/rust-lang/rust/issues/42460
849 [42607]: https://github.com/rust-lang/rust/issues/42607
850 [42740]: https://github.com/rust-lang/rust/pull/42740
851 [42844]: https://github.com/rust-lang/rust/issues/42844
852 [42948]: https://github.com/rust-lang/rust/pull/42948
853 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
854 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
855 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
856 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
857 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
858 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
859 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
860 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
861 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
862 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
863 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
864 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
865 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
866 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
867 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
868 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
869 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
870 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
871 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
872 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
873 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
874 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
877 Version 1.18.0 (2017-06-08)
878 ===========================
883 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
884 make the item visible to just that module tree. Also accepts the keyword
885 `crate` to make something public to the whole crate but not users of the
886 library. Example: `pub(crate) mod utils;`. [RFC 1422].
887 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
888 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
889 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
890 types like `Write + Send`, trailing `+` are now supported in trait objects,
891 and better error reporting for trait objects starting with `?Sized`.
892 - [0e+10 is now a valid floating point literal][40589]
893 - [Now warns if you bind a lifetime parameter to 'static][40734]
894 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
895 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
896 representation in some cases.][40377]
901 - [rustc can now emit mir with `--emit mir`][39891]
902 - [Improved LLVM IR for trivial functions][40367]
903 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
904 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
905 opportunities found through profiling
906 - [Improved backtrace formatting when panicking][38165]
911 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
912 iterator hasn't been advanced the original `Vec` is reassembled with no actual
913 iteration or reallocation.
914 - [Simplified HashMap Bucket interface][40561] provides performance
915 improvements for iterating and cloning.
916 - [Specialize Vec::from_elem to use calloc][40409]
917 - [Fixed Race condition in fs::create_dir_all][39799]
918 - [No longer caching stdio on Windows][40516]
919 - [Optimized insertion sort in slice][40807] insertion sort in some cases
920 2.50%~ faster and in one case now 12.50% faster.
921 - [Optimized `AtomicBool::fetch_nand`][41143]
926 - [`Child::try_wait`]
927 - [`HashMap::retain`]
928 - [`HashSet::retain`]
930 - [`TcpStream::peek`]
931 - [`UdpSocket::peek`]
932 - [`UdpSocket::peek_from`]
937 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
938 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
939 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
940 - [Added Android build support][cargo/3885]
941 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
942 of a certain type, for example `cargo build --bins` will build all
944 - [Added support for haiku][cargo/3952]
949 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
950 - [Added rust-windbg script for better debugging on Windows][39983]
951 - [Rust now uses the official cross compiler for NetBSD][40612]
952 - [rustdoc now accepts `#` at the start of files][40828]
953 - [Fixed jemalloc support for musl][41168]
958 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
959 always placed after the sign if it exists and before the digits. With the `#`
960 flag the zeroes are placed after the prefix and before the digits.
961 - [Due to the struct field optimisation][40377], using `transmute` on structs
962 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
963 always been undefined behavior, but is now more likely to break in practice.
964 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
965 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
966 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
967 - [Overlapping inherent `impl`s are now a hard error][40728]
968 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
969 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
970 `out.asm` and `out.ll` instead of only one of the filetypes.
971 - [ calling a function that returns `Self` will no longer work][41805] when
972 the size of `Self` cannot be statically determined.
973 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
974 this has caused a few regressions namely:
976 - Changed the link order of local static/dynamic libraries (respecting the
977 order on given rather than having the compiler reorder).
978 - Changed how MinGW is linked, native code linked to dynamic libraries
979 may require manually linking to the gcc support library (for the native
982 [38165]: https://github.com/rust-lang/rust/pull/38165
983 [39799]: https://github.com/rust-lang/rust/pull/39799
984 [39891]: https://github.com/rust-lang/rust/pull/39891
985 [39983]: https://github.com/rust-lang/rust/pull/39983
986 [40043]: https://github.com/rust-lang/rust/pull/40043
987 [40241]: https://github.com/rust-lang/rust/pull/40241
988 [40338]: https://github.com/rust-lang/rust/pull/40338
989 [40367]: https://github.com/rust-lang/rust/pull/40367
990 [40377]: https://github.com/rust-lang/rust/pull/40377
991 [40409]: https://github.com/rust-lang/rust/pull/40409
992 [40516]: https://github.com/rust-lang/rust/pull/40516
993 [40556]: https://github.com/rust-lang/rust/pull/40556
994 [40561]: https://github.com/rust-lang/rust/pull/40561
995 [40589]: https://github.com/rust-lang/rust/pull/40589
996 [40612]: https://github.com/rust-lang/rust/pull/40612
997 [40723]: https://github.com/rust-lang/rust/pull/40723
998 [40728]: https://github.com/rust-lang/rust/pull/40728
999 [40731]: https://github.com/rust-lang/rust/pull/40731
1000 [40734]: https://github.com/rust-lang/rust/pull/40734
1001 [40805]: https://github.com/rust-lang/rust/pull/40805
1002 [40807]: https://github.com/rust-lang/rust/pull/40807
1003 [40828]: https://github.com/rust-lang/rust/pull/40828
1004 [40870]: https://github.com/rust-lang/rust/pull/40870
1005 [41085]: https://github.com/rust-lang/rust/pull/41085
1006 [41143]: https://github.com/rust-lang/rust/pull/41143
1007 [41168]: https://github.com/rust-lang/rust/pull/41168
1008 [41270]: https://github.com/rust-lang/rust/issues/41270
1009 [41469]: https://github.com/rust-lang/rust/pull/41469
1010 [41805]: https://github.com/rust-lang/rust/issues/41805
1011 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
1012 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
1013 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
1014 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
1015 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
1016 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
1017 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
1018 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
1019 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
1020 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
1021 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
1022 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
1023 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
1024 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
1027 Version 1.17.0 (2017-04-27)
1028 ===========================
1033 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
1034 * [Fields of structs may be initialized without duplicating the field/variable
1035 names][39761]. [RFC 1682]
1036 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
1037 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1038 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
1039 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
1040 `'b`. Soundness fix.
1041 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
1042 * [Static variables may contain references to other statics][40027]
1047 * [Exit quickly on only `--emit dep-info`][40336]
1048 * [Make `-C relocation-model` more correctly determine whether the linker
1049 creates a position-independent executable][40245]
1050 * [Add `-C overflow-checks` to directly control whether integer overflow
1052 * [The rustc type checker now checks items on demand instead of in a single
1053 in-order pass][40008]. This is mostly an internal refactoring in support of
1054 future work, including incremental type checking, but also resolves [RFC
1055 1647], allowing `Self` to appear in `impl` `where` clauses.
1056 * [Optimize vtable loads][39995]
1057 * [Turn off vectorization for Emscripten targets][39990]
1058 * [Provide suggestions for unknown macros imported with `use`][39953]
1059 * [Fix ICEs in path resolution][39939]
1060 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
1061 * [Add clearer error message using `&str + &str`][39116]
1072 * [`Ordering::then`]
1073 * [`Ordering::then_with`]
1074 * [`BTreeMap::range`]
1075 * [`BTreeMap::range_mut`]
1076 * [`collections::Bound`]
1077 * [`process::abort`]
1078 * [`ptr::read_unaligned`]
1079 * [`ptr::write_unaligned`]
1080 * [`Result::expect_err`]
1083 * [`Cell::into_inner`]
1089 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
1090 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
1091 * [`String` implements `FromIterator<&char>`][40028]
1092 * `Box` [implements][40009] a number of new conversions:
1093 `From<Box<str>> for String`,
1094 `From<Box<[T]>> for Vec<T>`,
1095 `From<Box<CStr>> for CString`,
1096 `From<Box<OsStr>> for OsString`,
1097 `From<Box<Path>> for PathBuf`,
1098 `Into<Box<str>> for String`,
1099 `Into<Box<[T]>> for Vec<T>`,
1100 `Into<Box<CStr>> for CString`,
1101 `Into<Box<OsStr>> for OsString`,
1102 `Into<Box<Path>> for PathBuf`,
1103 `Default for Box<str>`,
1104 `Default for Box<CStr>`,
1105 `Default for Box<OsStr>`,
1106 `From<&CStr> for Box<CStr>`,
1107 `From<&OsStr> for Box<OsStr>`,
1108 `From<&Path> for Box<Path>`
1109 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
1110 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
1111 * [Slightly optimize `slice::sort`][39538]
1112 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
1113 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
1114 `Box<str>` implements `From<&str>`][39438]
1115 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
1116 `From<(I, u16)> where I: Into<IpAddr>`][39372]
1117 * [`format!` estimates the needed capacity before writing a string][39356]
1118 * [Support unprivileged symlink creation in Windows][38921]
1119 * [`PathBuf` implements `Default`][38764]
1120 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
1121 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
1122 and poor hash functions.
1127 * [Add `cargo check --all`][cargo/3731]
1128 * [Add an option to ignore SSL revocation checking][cargo/3699]
1129 * [Add `cargo run --package`][cargo/3691]
1130 * [Add `required_features`][cargo/3667]
1131 * [Assume `build.rs` is a build script][cargo/3664]
1132 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
1137 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
1139 * [The "Unstable Book" documents nightly-only features][ubook]
1140 * [Improve the style of the sidebar in rustdoc output][40265]
1141 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
1142 * [Fix MSP430 breakage due to `i128`][40257]
1143 * [Preliminary Solaris/SPARCv9 support][39903]
1144 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
1145 run without installing the MSVC runtime.
1146 * [`rustdoc --test` includes file names in test names][39788]
1147 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
1148 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
1149 * [Initial support for `aarch64-unknown-freebsd`][39491]
1150 * [Initial support for `i686-unknown-netbsd`][39426]
1151 * [This release no longer includes the old makefile build system][39431]. Rust
1152 is built with a custom build system, written in Rust, and with Cargo.
1153 * [Add Debug implementations for libcollection structs][39002]
1154 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
1155 * [`--test-threads=0` produces an error][38945]
1156 * [`rustup` installs documentation by default][40526]
1157 * [The Rust source includes NatVis visualizations][39843]. These can be used by
1158 WinDbg and Visual Studio to improve the debugging experience.
1163 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
1164 workaround, either use MSVC 2015 or run vcvars.bat.
1165 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
1166 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
1167 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
1169 * [`format!` and `Display::to_string` panic if an underlying formatting
1170 implementation returns an error][40117]. Previously the error was silently
1171 ignored. It is incorrect for `write_fmt` to return an error when writing
1173 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
1174 crates were marked stable and could be accessed from the stable toolchain.
1175 * [Rust git source no longer includes vendored crates][39728]. Those that need
1176 to build with vendored crates should build from release tarballs.
1177 * [Fix inert attributes from `proc_macro_derives`][39572]
1178 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
1179 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
1181 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
1182 existing code generally ignores the type of dead-code unless a type-hint is
1183 provided; this can cause surprising inference interactions particularly around
1184 defaulting. The new code uniformly ignores the result type of dead-code.
1185 * [Tuple-struct constructors with private fields are no longer visible][38932]
1186 * [Lifetime parameters that do not appear in the arguments are now considered
1187 early-bound][38897], resolving a soundness bug (#[32330]). The
1188 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
1190 * [rustdoc: fix doctests with non-feature crate attributes][38161]
1191 * [Make transmuting from fn item types to pointer-sized types a hard
1194 [27787]: https://github.com/rust-lang/rust/issues/27787
1195 [32330]: https://github.com/rust-lang/rust/issues/32330
1196 [34198]: https://github.com/rust-lang/rust/pull/34198
1197 [38161]: https://github.com/rust-lang/rust/pull/38161
1198 [38368]: https://github.com/rust-lang/rust/pull/38368
1199 [38584]: https://github.com/rust-lang/rust/issues/38584
1200 [38661]: https://github.com/rust-lang/rust/pull/38661
1201 [38764]: https://github.com/rust-lang/rust/pull/38764
1202 [38864]: https://github.com/rust-lang/rust/issues/38864
1203 [38897]: https://github.com/rust-lang/rust/pull/38897
1204 [38921]: https://github.com/rust-lang/rust/pull/38921
1205 [38932]: https://github.com/rust-lang/rust/pull/38932
1206 [38945]: https://github.com/rust-lang/rust/pull/38945
1207 [38981]: https://github.com/rust-lang/rust/pull/38981
1208 [39002]: https://github.com/rust-lang/rust/pull/39002
1209 [39116]: https://github.com/rust-lang/rust/pull/39116
1210 [39193]: https://github.com/rust-lang/rust/pull/39193
1211 [39265]: https://github.com/rust-lang/rust/pull/39265
1212 [39356]: https://github.com/rust-lang/rust/pull/39356
1213 [39372]: https://github.com/rust-lang/rust/pull/39372
1214 [39426]: https://github.com/rust-lang/rust/pull/39426
1215 [39431]: https://github.com/rust-lang/rust/pull/39431
1216 [39438]: https://github.com/rust-lang/rust/pull/39438
1217 [39440]: https://github.com/rust-lang/rust/pull/39440
1218 [39485]: https://github.com/rust-lang/rust/pull/39485
1219 [39491]: https://github.com/rust-lang/rust/pull/39491
1220 [39518]: https://github.com/rust-lang/rust/pull/39518
1221 [39538]: https://github.com/rust-lang/rust/pull/39538
1222 [39572]: https://github.com/rust-lang/rust/pull/39572
1223 [39633]: https://github.com/rust-lang/rust/pull/39633
1224 [39642]: https://github.com/rust-lang/rust/pull/39642
1225 [39728]: https://github.com/rust-lang/rust/pull/39728
1226 [39761]: https://github.com/rust-lang/rust/pull/39761
1227 [39788]: https://github.com/rust-lang/rust/pull/39788
1228 [39793]: https://github.com/rust-lang/rust/pull/39793
1229 [39837]: https://github.com/rust-lang/rust/pull/39837
1230 [39843]: https://github.com/rust-lang/rust/pull/39843
1231 [39851]: https://github.com/rust-lang/rust/pull/39851
1232 [39903]: https://github.com/rust-lang/rust/pull/39903
1233 [39939]: https://github.com/rust-lang/rust/pull/39939
1234 [39953]: https://github.com/rust-lang/rust/pull/39953
1235 [39960]: https://github.com/rust-lang/rust/pull/39960
1236 [39990]: https://github.com/rust-lang/rust/pull/39990
1237 [39995]: https://github.com/rust-lang/rust/pull/39995
1238 [40008]: https://github.com/rust-lang/rust/pull/40008
1239 [40009]: https://github.com/rust-lang/rust/pull/40009
1240 [40027]: https://github.com/rust-lang/rust/pull/40027
1241 [40028]: https://github.com/rust-lang/rust/pull/40028
1242 [40037]: https://github.com/rust-lang/rust/pull/40037
1243 [40117]: https://github.com/rust-lang/rust/pull/40117
1244 [40166]: https://github.com/rust-lang/rust/pull/40166
1245 [40245]: https://github.com/rust-lang/rust/pull/40245
1246 [40257]: https://github.com/rust-lang/rust/pull/40257
1247 [40261]: https://github.com/rust-lang/rust/pull/40261
1248 [40265]: https://github.com/rust-lang/rust/pull/40265
1249 [40319]: https://github.com/rust-lang/rust/pull/40319
1250 [40336]: https://github.com/rust-lang/rust/pull/40336
1251 [40526]: https://github.com/rust-lang/rust/pull/40526
1252 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1253 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
1254 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
1255 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
1256 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
1257 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
1258 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
1259 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
1260 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
1261 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
1262 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
1263 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
1264 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
1265 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
1266 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1267 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
1268 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
1269 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
1270 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
1271 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
1272 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
1273 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
1274 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
1275 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
1276 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
1277 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
1278 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
1279 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
1280 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
1281 [mdbook]: https://crates.io/crates/mdbook
1282 [ubook]: https://doc.rust-lang.org/unstable-book/
1285 Version 1.16.0 (2017-03-16)
1286 ===========================
1291 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1292 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1293 match patterns][38069]
1294 * [Clean up semantics of `self` in an import list][38313]
1295 * [`Self` may appear in `impl` headers][38920]
1296 * [`Self` may appear in struct expressions][39282]
1301 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
1302 a `.rmeta` file containing only crate metadata][38571]. This can be
1303 used by tools like the Rust Language Service to perform
1304 metadata-only builds.
1305 * [Levenshtein based typo suggestions now work in most places, while
1306 previously they worked only for fields and sometimes for local
1307 variables][38927]. Together with the overhaul of "no
1308 resolution"/"unexpected resolution" errors (#[38154]) they result in
1309 large and systematic improvement in resolution diagnostics.
1310 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
1312 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
1313 * [`rustc` no longer attempts to provide "consider using an explicit
1314 lifetime" suggestions][37057]. They were inaccurate.
1319 * [`VecDeque::truncate`]
1320 * [`VecDeque::resize`]
1321 * [`String::insert_str`]
1322 * [`Duration::checked_add`]
1323 * [`Duration::checked_sub`]
1324 * [`Duration::checked_div`]
1325 * [`Duration::checked_mul`]
1328 * [`SocketAddr::is_ipv4`]
1329 * [`SocketAddr::is_ipv6`]
1330 * [`IpAddr::is_ipv4`]
1331 * [`IpAddr::is_ipv6`]
1333 * [`Vec::dedup_by_key`]
1334 * [`Result::unwrap_or_default`]
1335 * [`<*const T>::wrapping_offset`]
1336 * [`<*mut T>::wrapping_offset`]
1337 * `CommandExt::creation_flags`
1338 * [`File::set_permissions`]
1339 * [`String::split_off`]
1344 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
1345 their argument by `Borrow` parameter][37761]
1346 * [All public types in std implement `Debug`][38006]
1347 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
1348 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
1349 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1351 * [std: Fix partial writes in `LineWriter`][38062]
1352 * [std: Clamp max read/write sizes on Unix][38062]
1353 * [Use more specific panic message for `&str` slicing errors][38066]
1354 * [`TcpListener::set_only_v6` is deprecated][38304]. This
1355 functionality cannot be achieved in std currently.
1356 * [`writeln!`, like `println!`, now accepts a form with no string
1357 or formatting arguments, to just print a newline][38469]
1358 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
1359 * [Reduce the size of static data in `std_unicode::tables`][38781]
1360 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
1361 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
1363 * [`Duration` implements `Sum`][38712]
1364 * [`String` implements `ToSocketAddrs`][39048]
1369 * [The `cargo check` command does a type check of a project without
1370 building it][cargo/3296]
1371 * [crates.io will display CI badges from Travis and AppVeyor, if
1372 specified in Cargo.toml][cargo/3546]
1373 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
1374 * [Compilation profiles accept integer values for `debug`, in addition
1375 to `true` and `false`. These are passed to `rustc` as the value to
1376 `-C debuginfo`][cargo/3534]
1377 * [Implement `cargo --version --verbose`][cargo/3604]
1378 * [All builds now output 'dep-info' build dependencies compatible with
1379 make and ninja][cargo/3557]
1380 * [Build all workspace members with `build --all`][cargo/3511]
1381 * [Document all workspace members with `doc --all`][cargo/3515]
1382 * [Path deps outside workspace are not members][cargo/3443]
1387 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
1388 the path to the Rust implementation][38589]
1389 * [The `armv7-linux-androideabi` target no longer enables NEON
1390 extensions, per Google's ABI guide][38413]
1391 * [The stock standard library can be compiled for Redox OS][38401]
1392 * [Rust has initial SPARC support][38726]. Tier 3. No builds
1394 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
1396 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
1401 * [Uninhabitable enums (those without any variants) no longer permit wildcard
1402 match patterns][38069]
1403 * In this release, references to uninhabited types can not be
1404 pattern-matched. This was accidentally allowed in 1.15.
1405 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
1406 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
1408 * [Clean up semantics of `self` in an import list][38313]
1409 * Reimplemented lifetime elision. This change was almost entirely compatible
1410 with existing code, but it did close a number of small bugs and loopholes,
1411 as well as being more accepting in some other [cases][41105].
1413 [37057]: https://github.com/rust-lang/rust/pull/37057
1414 [37761]: https://github.com/rust-lang/rust/pull/37761
1415 [38006]: https://github.com/rust-lang/rust/pull/38006
1416 [38051]: https://github.com/rust-lang/rust/pull/38051
1417 [38062]: https://github.com/rust-lang/rust/pull/38062
1418 [38062]: https://github.com/rust-lang/rust/pull/38622
1419 [38066]: https://github.com/rust-lang/rust/pull/38066
1420 [38069]: https://github.com/rust-lang/rust/pull/38069
1421 [38131]: https://github.com/rust-lang/rust/pull/38131
1422 [38154]: https://github.com/rust-lang/rust/pull/38154
1423 [38274]: https://github.com/rust-lang/rust/pull/38274
1424 [38304]: https://github.com/rust-lang/rust/pull/38304
1425 [38313]: https://github.com/rust-lang/rust/pull/38313
1426 [38314]: https://github.com/rust-lang/rust/pull/38314
1427 [38327]: https://github.com/rust-lang/rust/pull/38327
1428 [38401]: https://github.com/rust-lang/rust/pull/38401
1429 [38413]: https://github.com/rust-lang/rust/pull/38413
1430 [38469]: https://github.com/rust-lang/rust/pull/38469
1431 [38559]: https://github.com/rust-lang/rust/pull/38559
1432 [38571]: https://github.com/rust-lang/rust/pull/38571
1433 [38580]: https://github.com/rust-lang/rust/pull/38580
1434 [38589]: https://github.com/rust-lang/rust/pull/38589
1435 [38670]: https://github.com/rust-lang/rust/pull/38670
1436 [38712]: https://github.com/rust-lang/rust/pull/38712
1437 [38726]: https://github.com/rust-lang/rust/pull/38726
1438 [38781]: https://github.com/rust-lang/rust/pull/38781
1439 [38798]: https://github.com/rust-lang/rust/pull/38798
1440 [38909]: https://github.com/rust-lang/rust/pull/38909
1441 [38920]: https://github.com/rust-lang/rust/pull/38920
1442 [38927]: https://github.com/rust-lang/rust/pull/38927
1443 [39048]: https://github.com/rust-lang/rust/pull/39048
1444 [39282]: https://github.com/rust-lang/rust/pull/39282
1445 [39379]: https://github.com/rust-lang/rust/pull/39379
1446 [41105]: https://github.com/rust-lang/rust/issues/41105
1447 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1448 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
1449 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
1450 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
1451 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
1452 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
1453 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
1454 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
1455 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
1456 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
1457 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
1458 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
1459 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
1460 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
1461 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
1462 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
1463 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
1464 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
1465 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
1466 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
1467 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
1468 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
1469 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
1470 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
1471 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
1472 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
1473 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
1474 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
1475 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
1476 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
1479 Version 1.15.1 (2017-02-09)
1480 ===========================
1482 * [Fix IntoIter::as_mut_slice's signature][39466]
1483 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
1485 [39466]: https://github.com/rust-lang/rust/pull/39466
1486 [39523]: https://github.com/rust-lang/rust/pull/39523
1489 Version 1.15.0 (2017-02-02)
1490 ===========================
1495 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
1496 stable. This allows popular code-generating crates like Serde and Diesel to
1497 work ergonomically. [RFC 1681].
1498 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
1499 with curly braces][36868]. Part of [RFC 1506].
1500 * [A number of minor changes to name resolution have been activated][37127].
1501 They add up to more consistent semantics, allowing for future evolution of
1502 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1503 details of what is different. The breaking changes here have been transitioned
1504 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1505 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
1507 * [`?Sized` can be used in `where` clauses][37791]
1508 * [There is now a limit on the size of monomorphized types and it can be
1509 modified with the `#![type_size_limit]` crate attribute, similarly to
1510 the `#![recursion_limit]` attribute][37789]
1515 * [On Windows, the compiler will apply dllimport attributes when linking to
1516 extern functions][37973]. Additional attributes and flags can control which
1517 library kind is linked and its name. [RFC 1717].
1518 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1519 * [The `--test` flag works with procedural macro crates][38107]
1520 * [Fix `extern "aapcs" fn` ABI][37814]
1521 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
1522 * [The `format!` expander recognizes incorrect `printf` and shell-style
1523 formatting directives and suggests the correct format][37613].
1524 * [Only report one error for all unused imports in an import list][37456]
1526 Compiler Performance
1527 --------------------
1529 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
1530 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
1531 * [Don't clone in `UnificationTable::probe`][37848]
1532 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
1533 * [Use small vectors in type walker][37760]
1534 * [Macro expansion performance was improved][37701]
1535 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
1536 * [Replace FNV with a faster hash function][37229]
1541 * [`std::iter::Iterator::min_by`]
1542 * [`std::iter::Iterator::max_by`]
1543 * [`std::os::*::fs::FileExt`]
1544 * [`std::sync::atomic::Atomic*::get_mut`]
1545 * [`std::sync::atomic::Atomic*::into_inner`]
1546 * [`std::vec::IntoIter::as_slice`]
1547 * [`std::vec::IntoIter::as_mut_slice`]
1548 * [`std::sync::mpsc::Receiver::try_iter`]
1549 * [`std::os::unix::process::CommandExt::before_exec`]
1550 * [`std::rc::Rc::strong_count`]
1551 * [`std::rc::Rc::weak_count`]
1552 * [`std::sync::Arc::strong_count`]
1553 * [`std::sync::Arc::weak_count`]
1554 * [`std::char::encode_utf8`]
1555 * [`std::char::encode_utf16`]
1556 * [`std::cell::Ref::clone`]
1557 * [`std::io::Take::into_inner`]
1562 * [The standard sorting algorithm has been rewritten for dramatic performance
1563 improvements][38192]. It is a hybrid merge sort, drawing influences from
1564 Timsort. Previously it was a naive merge sort.
1565 * [`Iterator::nth` no longer has a `Sized` bound][38134]
1566 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
1568 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
1569 and `char_indices().last()`][37882]
1570 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
1571 * [Chinese characters display correctly in `fmt::Debug`][37855]
1572 * [Derive `Default` for `Duration`][37699]
1573 * [Support creation of anonymous pipes on WinXP/2k][37677]
1574 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
1575 * [Don't pass overlapped handles to processes][38835]
1580 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1581 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1582 should instead check the variable at runtime with `std::env`. That the value
1583 was set at build time was a bug, and incorrect when cross-compiling. This
1584 change is known to cause breakage.
1585 * [Add `--all` flag to `cargo test`][cargo/3221]
1586 * [Compile statically against the MSVC CRT][cargo/3363]
1587 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
1588 * [Link OpenSSL statically on OSX][cargo/3311]
1589 * [Apply new fingerprinting to build dir outputs][cargo/3310]
1590 * [Test for bad path overrides with summaries][cargo/3336]
1591 * [Require `cargo install --vers` to take a semver version][cargo/3338]
1592 * [Fix retrying crate downloads for network errors][cargo/3348]
1593 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
1594 * [Emit more info on --message-format=json][cargo/3319]
1595 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
1596 * [Don't ignore errors in workspace manifest][cargo/3409]
1597 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
1602 * [Test runners (binaries built with `--test`) now support a `--list` argument
1603 that lists the tests it contains][38185]
1604 * [Test runners now support a `--exact` argument that makes the test filter
1605 match exactly, instead of matching only a substring of the test name][38181]
1606 * [rustdoc supports a `--playground-url` flag][37763]
1607 * [rustdoc provides more details about `#[should_panic]` errors][37749]
1612 * [The Rust build system is now written in Rust][37817]. The Makefiles may
1613 continue to be used in this release by passing `--disable-rustbuild` to the
1614 configure script, but they will be deleted soon. Note that the new build
1615 system uses a different on-disk layout that will likely affect any scripts
1617 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
1619 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
1620 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
1626 * [A number of minor changes to name resolution have been activated][37127].
1627 They add up to more consistent semantics, allowing for future evolution of
1628 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1629 details of what is different. The breaking changes here have been transitioned
1630 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1631 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1632 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1633 should instead check the variable at runtime with `std::env`. That the value
1634 was set at build time was a bug, and incorrect when cross-compiling. This
1635 change is known to cause breakage.
1636 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
1637 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
1638 1.10 and is now an error by default. It will become a hard error in the near
1640 * [The semantics relating modules to file system directories are changing in
1641 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
1642 lint, which is a warning in this release, and will become a hard error in the
1644 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1645 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
1646 the underlying iterator][37834]
1648 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
1649 [33685]: https://github.com/rust-lang/rust/issues/33685
1650 [36868]: https://github.com/rust-lang/rust/pull/36868
1651 [37127]: https://github.com/rust-lang/rust/pull/37127
1652 [37229]: https://github.com/rust-lang/rust/pull/37229
1653 [37456]: https://github.com/rust-lang/rust/pull/37456
1654 [37527]: https://github.com/rust-lang/rust/pull/37527
1655 [37602]: https://github.com/rust-lang/rust/pull/37602
1656 [37613]: https://github.com/rust-lang/rust/pull/37613
1657 [37615]: https://github.com/rust-lang/rust/pull/37615
1658 [37636]: https://github.com/rust-lang/rust/pull/37636
1659 [37627]: https://github.com/rust-lang/rust/pull/37627
1660 [37642]: https://github.com/rust-lang/rust/pull/37642
1661 [37677]: https://github.com/rust-lang/rust/pull/37677
1662 [37699]: https://github.com/rust-lang/rust/pull/37699
1663 [37701]: https://github.com/rust-lang/rust/pull/37701
1664 [37705]: https://github.com/rust-lang/rust/pull/37705
1665 [37749]: https://github.com/rust-lang/rust/pull/37749
1666 [37760]: https://github.com/rust-lang/rust/pull/37760
1667 [37763]: https://github.com/rust-lang/rust/pull/37763
1668 [37764]: https://github.com/rust-lang/rust/pull/37764
1669 [37789]: https://github.com/rust-lang/rust/pull/37789
1670 [37791]: https://github.com/rust-lang/rust/pull/37791
1671 [37814]: https://github.com/rust-lang/rust/pull/37814
1672 [37817]: https://github.com/rust-lang/rust/pull/37817
1673 [37834]: https://github.com/rust-lang/rust/pull/37834
1674 [37848]: https://github.com/rust-lang/rust/pull/37848
1675 [37855]: https://github.com/rust-lang/rust/pull/37855
1676 [37882]: https://github.com/rust-lang/rust/pull/37882
1677 [37888]: https://github.com/rust-lang/rust/pull/37888
1678 [37973]: https://github.com/rust-lang/rust/pull/37973
1679 [37979]: https://github.com/rust-lang/rust/pull/37979
1680 [38086]: https://github.com/rust-lang/rust/pull/38086
1681 [38107]: https://github.com/rust-lang/rust/pull/38107
1682 [38117]: https://github.com/rust-lang/rust/pull/38117
1683 [38134]: https://github.com/rust-lang/rust/pull/38134
1684 [38146]: https://github.com/rust-lang/rust/pull/38146
1685 [38181]: https://github.com/rust-lang/rust/pull/38181
1686 [38182]: https://github.com/rust-lang/rust/pull/38182
1687 [38185]: https://github.com/rust-lang/rust/pull/38185
1688 [38192]: https://github.com/rust-lang/rust/pull/38192
1689 [38279]: https://github.com/rust-lang/rust/pull/38279
1690 [38835]: https://github.com/rust-lang/rust/pull/38835
1691 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1692 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
1693 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
1694 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
1695 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
1696 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
1697 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
1698 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
1699 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
1700 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
1701 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
1702 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
1703 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
1704 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
1705 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
1706 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
1707 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
1708 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
1709 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
1710 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
1711 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
1712 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
1713 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
1714 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
1715 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
1716 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
1717 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
1718 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
1719 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
1720 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
1721 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
1722 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
1723 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
1724 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
1725 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
1726 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
1727 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
1728 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
1731 Version 1.14.0 (2016-12-22)
1732 ===========================
1737 * [`..` matches multiple tuple fields in enum variants, structs
1738 and tuples][36843]. [RFC 1492].
1739 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
1740 * [`use *` and `use ::*` both glob-import from the crate root][37367]
1741 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
1742 dereferencing][36822]
1747 * [Mark enums with non-zero discriminant as non-zero][37224]
1748 * [Lower-case `static mut` names are linted like other
1749 statics and consts][37162]
1750 * [Fix ICE on some macros in const integer positions
1751 (e.g. `[u8; m!()]`)][36819]
1752 * [Improve error message and snippet for "did you mean `x`"][36798]
1753 * [Add a panic-strategy field to the target specification][36794]
1754 * [Include LLVM version in `--version --verbose`][37200]
1756 Compile-time Optimizations
1757 --------------------------
1759 * [Improve macro expansion performance][37569]
1760 * [Shrink `Expr_::ExprInlineAsm`][37445]
1761 * [Replace all uses of SHA-256 with BLAKE2b][37439]
1762 * [Reduce the number of bytes hashed by `IchHasher`][37427]
1763 * [Avoid more allocations when compiling html5ever][37373]
1764 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
1765 * [Avoid some allocations in the macro parser][37318]
1766 * [Use a faster deflate setting][37298]
1767 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
1768 during interning of slices][37270]
1769 * [Optimize `write_metadata`][37267]
1770 * [Don't process obligation forest cycles when stalled][37231]
1771 * [Avoid many `CrateConfig` clones][37161]
1772 * [Optimize `Substs::super_fold_with`][37108]
1773 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
1774 * [Speed up `plug_leaks`][36917]
1779 * [`println!()`, with no arguments, prints newline][36825].
1780 Previously, an empty string was required to achieve the same.
1781 * [`Wrapping` impls standard binary and unary operators, as well as
1782 the `Sum` and `Product` iterators][37356]
1783 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
1785 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
1786 `VecDeque` iterators][37315]
1787 * [Improve `SipHasher` performance on small values][37312]
1788 * [Add Iterator trait TrustedLen to enable better FromIterator /
1790 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
1791 * [`ReadDir` implements `Debug`][37221]
1792 * [Implement `RefUnwindSafe` for atomic types][37178]
1793 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
1794 * [Avoid allocations in `Decoder::read_str`][37064]
1795 * [`io::Error` implements `From<io::ErrorKind>`][37037]
1796 * [Impl `Debug` for raw pointers to unsized data][36880]
1797 * [Don't reuse `HashMap` random seeds][37470]
1798 * [The internal memory layout of `HashMap` is more cache-friendly, for
1799 significant improvements in some operations][36692]
1800 * [`HashMap` uses less memory on 32-bit architectures][36595]
1801 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
1806 * [Expose rustc cfg values to build scripts][cargo/3243]
1807 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
1808 * [Fix passing --features when testing multiple packages][cargo/3280]
1809 * [Use a single profile set per workspace][cargo/3249]
1810 * [Load `replace` sections from lock files][cargo/3220]
1811 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
1816 * [rustup is the recommended Rust installation method][1.14rustup]
1817 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
1818 S390x. These are [tier 2] platforms and may have major defects. Follow the
1819 instructions on the website to install, or add the targets to an existing
1820 installation with `rustup target add`. The new target triples are:
1821 - `mips-unknown-linux-gnu`
1822 - `mipsel-unknown-linux-gnu`
1823 - `mips64-unknown-linux-gnuabi64`
1824 - `mips64el-unknown-linux-gnuabi64 `
1825 - `powerpc-unknown-linux-gnu`
1826 - `powerpc64-unknown-linux-gnu`
1827 - `powerpc64le-unknown-linux-gnu`
1828 - `s390x-unknown-linux-gnu `
1829 * This release includes target (std) builds for ARM Linux running MUSL
1830 libc. These are [tier 2] platforms and may have major defects. Add the
1831 following triples to an existing rustup installation with `rustup target add`:
1832 - `arm-unknown-linux-musleabi`
1833 - `arm-unknown-linux-musleabihf`
1834 - `armv7-unknown-linux-musleabihf`
1835 * This release includes [experimental support for WebAssembly][1.14wasm], via
1836 the `wasm32-unknown-emscripten` target. This target is known to have major
1837 defects. Please test, report, and fix.
1838 * rustup no longer installs documentation by default. Run `rustup
1839 component add rust-docs` to install.
1840 * [Fix line stepping in debugger][37310]
1841 * [Enable line number debuginfo in releases][37280]
1846 * [Disable jemalloc on aarch64/powerpc/mips][37392]
1847 * [Add support for Fuchsia OS][37313]
1848 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
1853 * [A number of forward-compatibility lints used by the compiler
1854 to gradually introduce language changes have been converted
1855 to deny by default][36894]:
1856 - ["use of inaccessible extern crate erroneously allowed"][36886]
1857 - ["type parameter default erroneously allowed in invalid location"][36887]
1858 - ["detects super or self keywords at the beginning of global path"][36888]
1859 - ["two overlapping inherent impls define an item with the same name
1860 were erroneously allowed"][36889]
1861 - ["floating-point constants cannot be used in patterns"][36890]
1862 - ["constants of struct or enum type can only be used in a pattern if
1863 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
1864 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
1865 * [Prohibit patterns in trait methods without bodies][37378]
1866 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
1867 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
1868 * [The `$crate` macro variable is accepted in fewer locations][37213]
1869 * [Impls specifying extra region requirements beyond the trait
1870 they implement are rejected][37167]
1871 * [Enums may not be unsized][37111]. Unsized enums are intended to
1872 work but never have. For now they are forbidden.
1873 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
1875 [tier 2]: https://forge.rust-lang.org/platform-support.html
1876 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
1877 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
1878 [36430]: https://github.com/rust-lang/rust/pull/36430
1879 [36595]: https://github.com/rust-lang/rust/pull/36595
1880 [36595]: https://github.com/rust-lang/rust/pull/36595
1881 [36692]: https://github.com/rust-lang/rust/pull/36692
1882 [36767]: https://github.com/rust-lang/rust/pull/36767
1883 [36794]: https://github.com/rust-lang/rust/pull/36794
1884 [36798]: https://github.com/rust-lang/rust/pull/36798
1885 [36819]: https://github.com/rust-lang/rust/pull/36819
1886 [36822]: https://github.com/rust-lang/rust/pull/36822
1887 [36825]: https://github.com/rust-lang/rust/pull/36825
1888 [36843]: https://github.com/rust-lang/rust/pull/36843
1889 [36880]: https://github.com/rust-lang/rust/pull/36880
1890 [36886]: https://github.com/rust-lang/rust/issues/36886
1891 [36887]: https://github.com/rust-lang/rust/issues/36887
1892 [36888]: https://github.com/rust-lang/rust/issues/36888
1893 [36889]: https://github.com/rust-lang/rust/issues/36889
1894 [36890]: https://github.com/rust-lang/rust/issues/36890
1895 [36891]: https://github.com/rust-lang/rust/issues/36891
1896 [36892]: https://github.com/rust-lang/rust/issues/36892
1897 [36894]: https://github.com/rust-lang/rust/pull/36894
1898 [36917]: https://github.com/rust-lang/rust/pull/36917
1899 [36993]: https://github.com/rust-lang/rust/pull/36993
1900 [37037]: https://github.com/rust-lang/rust/pull/37037
1901 [37064]: https://github.com/rust-lang/rust/pull/37064
1902 [37094]: https://github.com/rust-lang/rust/pull/37094
1903 [37108]: https://github.com/rust-lang/rust/pull/37108
1904 [37111]: https://github.com/rust-lang/rust/pull/37111
1905 [37161]: https://github.com/rust-lang/rust/pull/37161
1906 [37162]: https://github.com/rust-lang/rust/pull/37162
1907 [37167]: https://github.com/rust-lang/rust/pull/37167
1908 [37178]: https://github.com/rust-lang/rust/pull/37178
1909 [37200]: https://github.com/rust-lang/rust/pull/37200
1910 [37213]: https://github.com/rust-lang/rust/pull/37213
1911 [37221]: https://github.com/rust-lang/rust/pull/37221
1912 [37224]: https://github.com/rust-lang/rust/pull/37224
1913 [37230]: https://github.com/rust-lang/rust/pull/37230
1914 [37231]: https://github.com/rust-lang/rust/pull/37231
1915 [37247]: https://github.com/rust-lang/rust/pull/37247
1916 [37267]: https://github.com/rust-lang/rust/pull/37267
1917 [37270]: https://github.com/rust-lang/rust/pull/37270
1918 [37273]: https://github.com/rust-lang/rust/pull/37273
1919 [37280]: https://github.com/rust-lang/rust/pull/37280
1920 [37298]: https://github.com/rust-lang/rust/pull/37298
1921 [37306]: https://github.com/rust-lang/rust/pull/37306
1922 [37310]: https://github.com/rust-lang/rust/pull/37310
1923 [37312]: https://github.com/rust-lang/rust/pull/37312
1924 [37313]: https://github.com/rust-lang/rust/pull/37313
1925 [37315]: https://github.com/rust-lang/rust/pull/37315
1926 [37318]: https://github.com/rust-lang/rust/pull/37318
1927 [37322]: https://github.com/rust-lang/rust/pull/37322
1928 [37326]: https://github.com/rust-lang/rust/pull/37326
1929 [37351]: https://github.com/rust-lang/rust/pull/37351
1930 [37356]: https://github.com/rust-lang/rust/pull/37356
1931 [37367]: https://github.com/rust-lang/rust/pull/37367
1932 [37373]: https://github.com/rust-lang/rust/pull/37373
1933 [37378]: https://github.com/rust-lang/rust/pull/37378
1934 [37389]: https://github.com/rust-lang/rust/pull/37389
1935 [37392]: https://github.com/rust-lang/rust/pull/37392
1936 [37427]: https://github.com/rust-lang/rust/pull/37427
1937 [37439]: https://github.com/rust-lang/rust/pull/37439
1938 [37445]: https://github.com/rust-lang/rust/pull/37445
1939 [37470]: https://github.com/rust-lang/rust/pull/37470
1940 [37569]: https://github.com/rust-lang/rust/pull/37569
1941 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1942 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
1943 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
1944 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
1945 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
1946 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
1947 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
1950 Version 1.13.0 (2016-11-10)
1951 ===========================
1956 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
1957 errors, like the `try!` macro, described in [RFC 0243].
1958 * [Stabilize macros in type position][36014]. Described in [RFC 873].
1959 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
1960 * [Fix `#[derive]` for empty tuple structs/variants][35728]
1961 * [Fix lifetime rules for 'if' conditions][36029]
1962 * [Avoid loading and parsing unconfigured non-inline modules][36482]
1967 * [Add the `-C link-arg` argument][36574]
1968 * [Remove the old AST-based backend from rustc_trans][35764]
1969 * [Don't enable NEON by default on armv7 Linux][35814]
1970 * [Fix debug line number info for macro expansions][35238]
1971 * [Do not emit "class method" debuginfo for types that are not
1972 DICompositeType][36008]
1973 * [Warn about multiple conflicting #[repr] hints][34623]
1974 * [When sizing DST, don't double-count nested struct prefixes][36351]
1975 * [Default RUST_MIN_STACK to 16MiB for now][36505]
1976 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
1977 * [Reject macros with empty repetitions to avoid infinite loop][36721]
1978 * [Expand macros without recursing to avoid stack overflows][36214]
1983 * [Replace macro backtraces with labeled local uses][35702]
1984 * [Improve error message for misplaced doc comments][33922]
1985 * [Buffer unix and lock windows to prevent message interleaving][35975]
1986 * [Update lifetime errors to specifically note temporaries][36171]
1987 * [Special case a few colors for Windows][36178]
1988 * [Suggest `use self` when such an import resolves][36289]
1989 * [Be more specific when type parameter shadows primitive type][36338]
1990 * Many minor improvements
1992 Compile-time Optimizations
1993 --------------------------
1995 * [Compute and cache HIR hashes at beginning][35854]
1996 * [Don't hash types in loan paths][36004]
1997 * [Cache projections in trans][35761]
1998 * [Optimize the parser's last token handling][36527]
1999 * [Only instantiate #[inline] functions in codegen units referencing
2000 them][36524]. This leads to big improvements in cases where crates export
2001 define many inline functions without using them directly.
2002 * [Lazily allocate TypedArena's first chunk][36592]
2003 * [Don't allocate during default HashSet creation][36734]
2010 * [`overflowing_abs`]
2011 * [`RefCell::try_borrow`]
2012 * [`RefCell::try_borrow_mut`]
2017 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
2018 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
2020 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
2021 * [Implement `Debug` for `std::vec::IntoIter`][35707]
2022 * [`CString`: avoid excessive growth just to 0-terminate][35871]
2023 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
2024 * [Use arc4rand on FreeBSD][35884]
2025 * [memrchr: Correct aligned offset computation][35969]
2026 * [Improve Demangling of Rust Symbols][36059]
2027 * [Use monotonic time in condition variables][35048]
2028 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
2029 * [Implement conversion traits for `char`][35755]
2030 * [Fix illegal instruction caused by overflow in channel cloning][36104]
2031 * [Zero first byte of CString on drop][36264]
2032 * [Inherit overflow checks for sum and product][36372]
2033 * [Add missing Eq implementations][36423]
2034 * [Implement `Debug` for `DirEntry`][36631]
2035 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
2037 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2038 * [Implement more traits for `std::io::ErrorKind`][35911]
2039 * [Optimize BinaryHeap bounds checking][36072]
2040 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
2041 `extend_with_element`][36355]
2042 * [Fix overflow checking in unsigned pow()][34942]
2047 * This release includes security fixes to both curl and OpenSSL.
2048 * [Fix transitive doctests when panic=abort][cargo/3021]
2049 * [Add --all-features flag to cargo][cargo/3038]
2050 * [Reject path-based dependencies in `cargo package`][cargo/3060]
2051 * [Don't parse the home directory more than once][cargo/3078]
2052 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
2053 * [Update OpenSSL to 1.0.2j][cargo/3121]
2054 * [Add license and license_file to cargo metadata output][cargo/3110]
2055 * [Make crates-io registry URL optional in config; ignore all changes to
2056 source.crates-io][cargo/3089]
2057 * [Don't download dependencies from other platforms][cargo/3123]
2058 * [Build transitive dev-dependencies when needed][cargo/3125]
2059 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
2060 * [Avoid updating registry when adding existing deps][cargo/3144]
2061 * [Warn about path overrides that won't work][cargo/3136]
2062 * [Use workspaces during `cargo install`][cargo/3146]
2063 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
2064 * [Add --message-format flag][cargo/3000]
2065 * [Pass target environment for rustdoc][cargo/3205]
2066 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
2067 * [Update curl and curl-sys][cargo/3241]
2068 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
2073 * [rustdoc: Add the `--sysroot` argument][36586]
2074 * [rustdoc: Fix a couple of issues with the search results][35655]
2075 * [rustdoc: remove the `!` from macro URLs and titles][35234]
2076 * [gdb: Fix pretty-printing special-cased Rust types][35585]
2077 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
2082 * [Remove unmaintained style guide][35124]
2083 * [Add s390x support][36369]
2084 * [Initial work at Haiku OS support][36727]
2085 * [Add mips-uclibc targets][35734]
2086 * [Crate-ify compiler-rt into compiler-builtins][35021]
2087 * [Add rustc version info (git hash + date) to dist tarball][36213]
2088 * Many documentation improvements
2093 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
2094 * [Deny (by default) transmuting from fn item types to pointer-sized
2095 types][34923]. Continuing the long transition to zero-sized fn items,
2097 * [Fix `#[derive]` for empty tuple structs/variants][35728].
2099 * [Issue deprecation warnings for safe accesses to extern statics][36173]
2100 * [Fix lifetime rules for 'if' conditions][36029].
2101 * [Inherit overflow checks for sum and product][36372].
2102 * [Forbid user-defined macros named "macro_rules"][36730].
2104 [33922]: https://github.com/rust-lang/rust/pull/33922
2105 [34623]: https://github.com/rust-lang/rust/pull/34623
2106 [34923]: https://github.com/rust-lang/rust/pull/34923
2107 [34942]: https://github.com/rust-lang/rust/pull/34942
2108 [34982]: https://github.com/rust-lang/rust/pull/34982
2109 [35021]: https://github.com/rust-lang/rust/pull/35021
2110 [35048]: https://github.com/rust-lang/rust/pull/35048
2111 [35074]: https://github.com/rust-lang/rust/pull/35074
2112 [35124]: https://github.com/rust-lang/rust/pull/35124
2113 [35234]: https://github.com/rust-lang/rust/pull/35234
2114 [35238]: https://github.com/rust-lang/rust/pull/35238
2115 [35354]: https://github.com/rust-lang/rust/pull/35354
2116 [35559]: https://github.com/rust-lang/rust/pull/35559
2117 [35585]: https://github.com/rust-lang/rust/pull/35585
2118 [35627]: https://github.com/rust-lang/rust/pull/35627
2119 [35655]: https://github.com/rust-lang/rust/pull/35655
2120 [35702]: https://github.com/rust-lang/rust/pull/35702
2121 [35707]: https://github.com/rust-lang/rust/pull/35707
2122 [35728]: https://github.com/rust-lang/rust/pull/35728
2123 [35734]: https://github.com/rust-lang/rust/pull/35734
2124 [35755]: https://github.com/rust-lang/rust/pull/35755
2125 [35761]: https://github.com/rust-lang/rust/pull/35761
2126 [35764]: https://github.com/rust-lang/rust/pull/35764
2127 [35814]: https://github.com/rust-lang/rust/pull/35814
2128 [35854]: https://github.com/rust-lang/rust/pull/35854
2129 [35871]: https://github.com/rust-lang/rust/pull/35871
2130 [35884]: https://github.com/rust-lang/rust/pull/35884
2131 [35911]: https://github.com/rust-lang/rust/pull/35911
2132 [35969]: https://github.com/rust-lang/rust/pull/35969
2133 [35975]: https://github.com/rust-lang/rust/pull/35975
2134 [36004]: https://github.com/rust-lang/rust/pull/36004
2135 [36008]: https://github.com/rust-lang/rust/pull/36008
2136 [36014]: https://github.com/rust-lang/rust/pull/36014
2137 [36029]: https://github.com/rust-lang/rust/pull/36029
2138 [36059]: https://github.com/rust-lang/rust/pull/36059
2139 [36072]: https://github.com/rust-lang/rust/pull/36072
2140 [36101]: https://github.com/rust-lang/rust/pull/36101
2141 [36104]: https://github.com/rust-lang/rust/pull/36104
2142 [36171]: https://github.com/rust-lang/rust/pull/36171
2143 [36173]: https://github.com/rust-lang/rust/pull/36173
2144 [36178]: https://github.com/rust-lang/rust/pull/36178
2145 [36213]: https://github.com/rust-lang/rust/pull/36213
2146 [36214]: https://github.com/rust-lang/rust/pull/36214
2147 [36264]: https://github.com/rust-lang/rust/pull/36264
2148 [36266]: https://github.com/rust-lang/rust/pull/36266
2149 [36289]: https://github.com/rust-lang/rust/pull/36289
2150 [36338]: https://github.com/rust-lang/rust/pull/36338
2151 [36351]: https://github.com/rust-lang/rust/pull/36351
2152 [36355]: https://github.com/rust-lang/rust/pull/36355
2153 [36369]: https://github.com/rust-lang/rust/pull/36369
2154 [36372]: https://github.com/rust-lang/rust/pull/36372
2155 [36423]: https://github.com/rust-lang/rust/pull/36423
2156 [36482]: https://github.com/rust-lang/rust/pull/36482
2157 [36505]: https://github.com/rust-lang/rust/pull/36505
2158 [36524]: https://github.com/rust-lang/rust/pull/36524
2159 [36527]: https://github.com/rust-lang/rust/pull/36527
2160 [36551]: https://github.com/rust-lang/rust/pull/36551
2161 [36574]: https://github.com/rust-lang/rust/pull/36574
2162 [36586]: https://github.com/rust-lang/rust/pull/36586
2163 [36592]: https://github.com/rust-lang/rust/pull/36592
2164 [36631]: https://github.com/rust-lang/rust/pull/36631
2165 [36639]: https://github.com/rust-lang/rust/pull/36639
2166 [36721]: https://github.com/rust-lang/rust/pull/36721
2167 [36727]: https://github.com/rust-lang/rust/pull/36727
2168 [36730]: https://github.com/rust-lang/rust/pull/36730
2169 [36734]: https://github.com/rust-lang/rust/pull/36734
2170 [36754]: https://github.com/rust-lang/rust/pull/36754
2171 [36995]: https://github.com/rust-lang/rust/pull/36995
2172 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
2173 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
2174 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2175 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
2176 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
2177 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
2178 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
2179 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
2180 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
2181 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
2182 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
2183 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
2184 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
2185 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
2186 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
2187 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
2188 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
2189 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
2190 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
2191 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
2192 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
2193 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
2194 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
2195 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
2196 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
2197 [rustup]: https://www.rustup.rs
2198 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
2199 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
2200 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
2201 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
2202 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
2203 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
2204 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
2207 Version 1.12.1 (2016-10-20)
2208 ===========================
2213 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
2214 * [Confusion with double negation and booleans][36856]
2215 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
2216 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
2217 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
2218 * [Corrupted memory after updated to 1.12][36936]
2219 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
2220 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
2221 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
2223 [36381]: https://github.com/rust-lang/rust/issues/36381
2224 [36856]: https://github.com/rust-lang/rust/issues/36856
2225 [36875]: https://github.com/rust-lang/rust/issues/36875
2226 [36924]: https://github.com/rust-lang/rust/issues/36924
2227 [36926]: https://github.com/rust-lang/rust/issues/36926
2228 [36936]: https://github.com/rust-lang/rust/issues/36936
2229 [37026]: https://github.com/rust-lang/rust/issues/37026
2230 [37112]: https://github.com/rust-lang/rust/issues/37112
2231 [37153]: https://github.com/rust-lang/rust/issues/37153
2234 Version 1.12.0 (2016-09-29)
2235 ===========================
2240 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2241 This translation pass is far simpler than the previous AST->LLVM pass, and
2242 creates opportunities to perform new optimizations directly on the MIR. It
2243 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2244 * [`rustc` presents a new, more readable error format, along with
2245 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2246 Most common editors supporting Rust have been updated to work with it. It was
2247 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2252 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
2253 This translation pass is far simpler than the previous AST->LLVM pass, and
2254 creates opportunities to perform new optimizations directly on the MIR. It
2255 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
2256 * [Print the Rust target name, not the LLVM target name, with
2257 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
2258 * [The computation of `TypeId` is correct in some cases where it was previously
2259 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
2260 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
2261 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
2262 `--print relocation-models`, and `--print code-models` print the available
2263 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
2264 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
2265 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
2266 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
2267 These targets produce statically-linked binaries. There are no binary release
2273 * [`rustc` presents a new, more readable error format, along with
2274 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
2275 Most common editors supporting Rust have been updated to work with it. It was
2276 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
2277 * [In error descriptions, references are now described in plain English,
2278 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
2279 * [In error type descriptions, unknown numeric types are named `{integer}` or
2280 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
2281 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
2286 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
2287 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
2288 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
2289 useful](https://github.com/rust-lang/rust/pull/34908)
2290 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
2291 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
2292 * [Semicolons are properly required as statement delimiters inside
2293 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
2294 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2299 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
2300 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
2301 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
2302 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
2303 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
2304 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
2305 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
2306 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
2307 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
2308 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
2309 Both on Unix and Windows.
2310 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
2311 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
2312 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
2313 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
2314 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
2315 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
2316 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
2317 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
2322 * [The `format!` macro and friends now allow a single argument to be formatted
2323 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
2324 * [The lifetime bounds on `[T]::binary_search_by` and
2325 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
2326 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
2327 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
2328 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
2329 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
2330 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
2331 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
2332 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
2333 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
2334 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
2335 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
2336 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
2337 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
2338 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
2339 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
2340 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
2341 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
2342 * [`mpsc::sync_channel` `Receiver`s return any available message before
2343 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
2344 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
2345 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
2350 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
2351 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
2352 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
2353 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
2354 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
2355 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
2356 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
2357 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
2358 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
2359 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
2360 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
2361 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
2362 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
2363 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
2364 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
2365 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
2370 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
2371 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
2376 * [Test binaries now support a `--test-threads` argument to specify the number
2377 of threads used to run tests, and which acts the same as the
2378 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
2379 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
2380 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
2381 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2382 * [Rust releases now come with source packages that can be installed by rustup
2383 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
2384 The resulting source code can be used by tools and IDES, located in the
2385 sysroot under `lib/rustlib/src`.
2390 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
2391 * Many minor improvements to the documentation.
2392 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
2397 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
2398 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
2399 * [When formatting strings, if "precision" is specified, the "fill",
2400 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
2401 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
2404 Version 1.11.0 (2016-08-18)
2405 ===========================
2410 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
2411 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
2412 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
2413 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
2414 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
2419 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
2420 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
2421 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
2422 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
2423 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
2424 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
2425 (in libcore - previously stabilized in libstd)
2426 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
2427 (in libcore - previously stabilized in libstd)
2428 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
2429 (in libcore - previously stabilized in libstd)
2430 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
2431 (in libcore - previously stabilized in libstd)
2432 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2433 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
2434 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
2435 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
2440 * [The `thread_local!` macro supports multiple definitions in a single
2441 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
2442 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
2443 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
2444 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
2445 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
2446 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
2447 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
2448 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
2453 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
2454 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
2455 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
2456 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
2457 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
2458 and `-vv` prints warnings for all crates.
2459 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
2460 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
2461 This provides room for expansion by arbitrary tools.
2462 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
2463 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
2464 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
2465 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
2466 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
2467 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
2468 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
2473 * [Caching projections speeds up type check dramatically for some
2474 workloads](https://github.com/rust-lang/rust/pull/33816)
2475 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
2476 This hasher is faster, but is believed to provide sufficient
2477 protection from collision attacks.
2478 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
2483 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
2484 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
2485 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
2486 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
2487 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
2492 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
2493 * [When emitting debug info, rustc emits frame pointers for closures,
2494 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
2495 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
2496 * Many more errors have been given error codes and extended
2498 * API documentation continues to be improved, with many new examples
2503 * [rustc no longer hangs when dependencies recursively re-export
2504 submodules](https://github.com/rust-lang/rust/pull/34542)
2505 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
2506 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
2507 rewritten](https://github.com/rust-lang/rust/pull/33895)
2508 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
2509 No targets use this yet, but it works toward AVR support.
2514 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
2515 * [The new follow-set rules that place restrictions on `macro_rules!`
2516 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
2517 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
2518 and has been a warning since 1.10.
2519 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
2520 This causes breakage in some corner cases.
2523 Version 1.10.0 (2016-07-07)
2524 ===========================
2529 * [Allow `concat_idents!` in type positions as well as in expression
2530 positions](https://github.com/rust-lang/rust/pull/33735).
2531 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
2532 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
2533 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
2534 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
2535 * [`panic!` can be converted to a runtime abort with the
2536 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
2537 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2538 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
2539 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
2540 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-rdylib.md).
2541 Note that Cargo does not yet directly support cdylibs.
2546 * `os::windows::fs::OpenOptionsExt::access_mode`
2547 * `os::windows::fs::OpenOptionsExt::share_mode`
2548 * `os::windows::fs::OpenOptionsExt::custom_flags`
2549 * `os::windows::fs::OpenOptionsExt::attributes`
2550 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
2551 * `os::unix::fs::OpenOptionsExt::custom_flags`
2552 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
2553 * `Default for sync::Weak`
2554 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
2555 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
2556 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
2557 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
2558 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
2559 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
2560 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
2561 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
2562 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
2563 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
2564 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
2565 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
2566 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
2567 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
2568 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
2569 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
2570 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
2571 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
2572 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
2573 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
2574 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
2575 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
2576 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
2577 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
2578 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
2579 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2580 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2581 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2582 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2583 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
2584 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
2585 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
2586 * Read/Write/RawFd impls for `UnixStream`
2587 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
2588 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
2589 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
2590 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
2591 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
2592 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
2593 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
2594 * RawFd impls for `UnixListener`
2595 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
2596 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
2597 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
2598 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
2599 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
2600 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
2601 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
2602 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
2603 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
2604 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
2605 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
2606 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
2607 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
2608 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
2609 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
2610 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
2611 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
2612 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
2613 * RawFd impls for `UnixDatagram`
2614 * `{BTree,Hash}Map::values_mut`
2615 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
2620 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
2621 The semantics of this minor method are subtle and probably not what
2623 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
2624 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
2625 will fall back to `/dev/urandom` temporarily to avoid blocking
2626 during early boot](https://github.com/rust-lang/rust/pull/33086).
2627 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
2628 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
2629 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
2630 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
2631 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
2632 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
2633 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
2637 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
2638 This controls the runtime behavior of the `panic!` macro
2639 and can be either "unwind" (the default), or "abort".
2640 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2641 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
2642 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
2643 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
2644 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
2645 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
2646 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
2647 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
2648 By default they are retried twice, which can be customized with the
2649 `net.retry` value in `.cargo/config`.
2650 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
2651 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
2652 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
2653 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
2654 Makes it possible to install multiple crates in parallel.
2655 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
2656 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
2657 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
2658 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
2659 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
2660 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
2665 * [rustc memory usage was reduced by refactoring the context used for
2666 type checking](https://github.com/rust-lang/rust/pull/33425).
2667 * [Speed up creation of `HashMap`s by caching the random keys used
2668 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
2669 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
2670 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
2671 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
2672 10x faster than the previous lookup tables.
2673 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
2678 * Many incremental improvements to documentation and rustdoc.
2679 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
2680 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
2681 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
2682 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
2683 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
2684 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
2685 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
2690 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
2691 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
2692 * [`std` no longer prints backtraces on platforms where the running
2693 module must be loaded with `env::current_exe`, which can't be relied
2694 on](https://github.com/rust-lang/rust/pull/33554).
2695 * This release includes std binaries for the i586-unknown-linux-gnu,
2696 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
2697 i586 target is for old x86 hardware without SSE2, and the armv7
2698 target is for Android running on modern ARM architectures.
2699 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
2700 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
2701 * [On Unix the runtime aborts by calling `libc::abort` instead of
2702 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
2703 * [Rust is now bootstrapped from the previous release of Rust,
2704 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
2709 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
2710 * [`target_env` for Linux ARM targets is just `gnu`, not
2711 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
2712 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
2713 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
2714 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
2715 Affects how macros are parsed.
2716 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
2717 * [Feature-gated attributes on macro-generated macro invocations are
2718 now rejected](https://github.com/rust-lang/rust/pull/32791).
2719 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
2720 This caused some minor changes to type inference.
2723 Version 1.9.0 (2016-05-26)
2724 ==========================
2729 * The `#[deprecated]` attribute when applied to an API will generate
2730 warnings when used. The warnings may be suppressed with
2731 `#[allow(deprecated)]`. [RFC 1270].
2732 * [`fn` item types are zero sized, and each `fn` names a unique
2733 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2734 `transmute` on a `fn` type will generate a warning for a few cycles,
2735 then will be converted to an error.
2736 * [Field and method resolution understand visibility, so private
2737 fields and methods cannot prevent the proper use of public fields
2738 and methods][1.9fv].
2739 * [The parser considers unicode codepoints in the
2740 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
2746 * [`std::panic::catch_unwind`][] (renamed from `recover`)
2747 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
2748 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
2749 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
2750 * [`str::is_char_boundary`]
2751 * [`<*const T>::as_ref`]
2752 * [`<*mut T>::as_ref`]
2753 * [`<*mut T>::as_mut`]
2754 * [`AsciiExt::make_ascii_uppercase`]
2755 * [`AsciiExt::make_ascii_lowercase`]
2756 * [`char::decode_utf16`]
2757 * [`char::DecodeUtf16`]
2758 * [`char::DecodeUtf16Error`]
2759 * [`char::DecodeUtf16Error::unpaired_surrogate`]
2760 * [`BTreeSet::take`]
2761 * [`BTreeSet::replace`]
2764 * [`HashSet::replace`]
2766 * [`OsString::with_capacity`]
2767 * [`OsString::clear`]
2768 * [`OsString::capacity`]
2769 * [`OsString::reserve`]
2770 * [`OsString::reserve_exact`]
2771 * [`OsStr::is_empty`]
2773 * [`std::os::unix::thread`]
2776 * [`JoinHandleExt::as_pthread_t`]
2777 * [`JoinHandleExt::into_pthread_t`]
2778 * [`HashSet::hasher`]
2779 * [`HashMap::hasher`]
2780 * [`CommandExt::exec`]
2781 * [`File::try_clone`]
2782 * [`SocketAddr::set_ip`]
2783 * [`SocketAddr::set_port`]
2784 * [`SocketAddrV4::set_ip`]
2785 * [`SocketAddrV4::set_port`]
2786 * [`SocketAddrV6::set_ip`]
2787 * [`SocketAddrV6::set_port`]
2788 * [`SocketAddrV6::set_flowinfo`]
2789 * [`SocketAddrV6::set_scope_id`]
2790 * [`slice::copy_from_slice`]
2791 * [`ptr::read_volatile`]
2792 * [`ptr::write_volatile`]
2793 * [`OpenOptions::create_new`]
2794 * [`TcpStream::set_nodelay`]
2795 * [`TcpStream::nodelay`]
2796 * [`TcpStream::set_ttl`]
2797 * [`TcpStream::ttl`]
2798 * [`TcpStream::set_only_v6`]
2799 * [`TcpStream::only_v6`]
2800 * [`TcpStream::take_error`]
2801 * [`TcpStream::set_nonblocking`]
2802 * [`TcpListener::set_ttl`]
2803 * [`TcpListener::ttl`]
2804 * [`TcpListener::set_only_v6`]
2805 * [`TcpListener::only_v6`]
2806 * [`TcpListener::take_error`]
2807 * [`TcpListener::set_nonblocking`]
2808 * [`UdpSocket::set_broadcast`]
2809 * [`UdpSocket::broadcast`]
2810 * [`UdpSocket::set_multicast_loop_v4`]
2811 * [`UdpSocket::multicast_loop_v4`]
2812 * [`UdpSocket::set_multicast_ttl_v4`]
2813 * [`UdpSocket::multicast_ttl_v4`]
2814 * [`UdpSocket::set_multicast_loop_v6`]
2815 * [`UdpSocket::multicast_loop_v6`]
2816 * [`UdpSocket::set_multicast_ttl_v6`]
2817 * [`UdpSocket::multicast_ttl_v6`]
2818 * [`UdpSocket::set_ttl`]
2819 * [`UdpSocket::ttl`]
2820 * [`UdpSocket::set_only_v6`]
2821 * [`UdpSocket::only_v6`]
2822 * [`UdpSocket::join_multicast_v4`]
2823 * [`UdpSocket::join_multicast_v6`]
2824 * [`UdpSocket::leave_multicast_v4`]
2825 * [`UdpSocket::leave_multicast_v6`]
2826 * [`UdpSocket::take_error`]
2827 * [`UdpSocket::connect`]
2828 * [`UdpSocket::send`]
2829 * [`UdpSocket::recv`]
2830 * [`UdpSocket::set_nonblocking`]
2835 * [`std::sync::Once` is poisoned if its initialization function
2837 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
2838 * [Most types implement `fmt::Debug`][1.9db].
2839 * [The default buffer size used by `BufReader` and `BufWriter` was
2840 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
2841 used by other languages.
2842 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
2843 `Duration` additionally implements `*=` and `/=`][1.9ta].
2844 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
2845 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
2846 * [`Chain` implements `BufRead`][1.9ch].
2847 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
2852 * [Cargo can now run concurrently][1.9cc].
2853 * [Top-level overrides allow specific revisions of crates to be
2854 overridden through the entire crate graph][1.9ct]. This is intended
2855 to make upgrades easier for large projects, by allowing crates to be
2856 forked temporarily until they've been upgraded and republished.
2857 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
2858 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
2859 on the commandline][1.9cf]. `rustc` arguments can also be specified
2860 in the `build.rustflags` configuration key.
2865 * [The time complexity of comparing variables for equivalence during type
2866 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
2867 to major compilation time improvement in some scenarios.
2868 * [`ToString` is specialized for `str`, giving it the same performance
2869 as `to_owned`][1.9ts].
2870 * [Spawning processes with `Command::output` no longer creates extra
2872 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
2873 for C-like enums][1.9cl].
2878 * [Passing the `--quiet` flag to a test runner will produce
2879 much-abbreviated output][1.9q].
2880 * The Rust Project now publishes std binaries for the
2881 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
2882 `i586-pc-windows-msvc` targets.
2887 * [`std::sync::Once` is poisoned if its initialization function
2889 * [It is illegal to define methods with the same name in overlapping
2890 inherent `impl` blocks][1.9sn].
2891 * [`fn` item types are zero sized, and each `fn` names a unique
2892 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2893 `transmute` on a `fn` type will generate a warning for a few cycles,
2894 then will be converted to an error.
2895 * [Improvements to const evaluation may trigger new errors when integer
2896 literals are out of range][1.9ce].
2899 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
2900 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
2901 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
2902 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
2903 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
2904 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
2905 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
2906 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
2907 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
2908 [1.9db]: https://github.com/rust-lang/rust/pull/32054
2909 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
2910 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
2911 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
2912 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
2913 [1.9o]: https://github.com/rust-lang/rust/pull/32325
2914 [1.9q]: https://github.com/rust-lang/rust/pull/31887
2915 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
2916 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
2917 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
2918 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
2919 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
2920 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
2921 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
2922 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
2923 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2924 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
2925 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2926 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
2927 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
2928 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
2929 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
2930 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
2931 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
2932 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
2933 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
2934 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
2935 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
2936 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
2937 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
2938 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
2939 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
2940 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
2941 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
2942 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
2943 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
2944 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
2945 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
2946 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
2947 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
2948 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
2949 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
2950 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
2951 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
2952 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
2953 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
2954 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
2955 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
2956 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
2957 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
2958 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
2959 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2960 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2961 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2962 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2963 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2964 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2965 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
2966 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2967 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
2968 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2969 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2970 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2971 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2972 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2973 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
2974 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
2975 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
2976 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
2977 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
2978 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
2979 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
2980 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
2981 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
2982 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
2983 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
2984 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
2985 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
2986 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
2987 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
2988 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
2989 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
2990 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
2991 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
2992 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
2993 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
2994 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
2995 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
2996 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
2997 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
2998 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
2999 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
3000 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
3001 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
3002 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
3003 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
3004 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
3005 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
3006 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
3007 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
3008 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
3011 Version 1.8.0 (2016-04-14)
3012 ==========================
3017 * Rust supports overloading of compound assignment statements like
3018 `+=` by implementing the [`AddAssign`], [`SubAssign`],
3019 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
3020 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
3022 * Empty structs can be defined with braces, as in `struct Foo { }`, in
3023 addition to the non-braced form, `struct Foo;`. [RFC 218].
3029 * [`str::encode_utf16`][] (renamed from `utf16_units`)
3030 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
3033 * [`ptr::drop_in_place`]
3035 * [`time::SystemTime`]
3037 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
3038 * [`Instant::elapsed`]
3039 * [`SystemTime::now`]
3040 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
3041 * [`SystemTime::elapsed`]
3042 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
3043 * [`SystemTimeError`]
3044 * [`SystemTimeError::duration`]
3045 * Various impls for `SystemTimeError`
3047 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
3048 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
3049 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
3050 * [The `write!` and `writeln!` macros correctly emit errors if any of
3051 their arguments can't be formatted][1.8w].
3052 * [Various I/O functions support large files on 32-bit Linux][1.8l].
3053 * [The Unix-specific `raw` modules, which contain a number of
3054 redefined C types are deprecated][1.8r], including `os::raw::unix`,
3055 `os::raw::macos`, and `os::raw::linux`. These modules defined types
3056 such as `ino_t` and `dev_t`. The inconsistency of these definitions
3057 across platforms was making it difficult to implement `std`
3058 correctly. Those that need these definitions should use the `libc`
3060 * The Unix-specific `MetadataExt` traits, including
3061 `os::unix::fs::MetadataExt`, which expose values such as inode
3062 numbers [no longer return platform-specific types][1.8r], but
3063 instead return widened integers. [RFC 1415].
3064 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
3065 * [Atomic loads and stores are not volatile][1.8a].
3066 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
3071 * [Inlining hash functions lead to a 3% compile-time improvement in
3072 some workloads][1.8h].
3073 * When using jemalloc, its symbols are [unprefixed so that it
3074 overrides the libc malloc implementation][1.8h]. This means that for
3075 rustc, LLVM is now using jemalloc, which results in a 6%
3076 compile-time improvement on a specific workload.
3077 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
3082 * [32-bit MSVC builds finally implement unwinding][1.8ms].
3083 i686-pc-windows-msvc is now considered a tier-1 platform.
3084 * [The `--print targets` flag prints a list of supported targets][1.8t].
3085 * [The `--print cfg` flag prints the `cfg`s defined for the current
3087 * [`rustc` can be built with an new Cargo-based build system, written
3088 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
3089 build system. To enable it configure with `configure --rustbuild`.
3090 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
3091 variants while also indicating the total number of missing variants
3092 if more than 3][1.8m].
3093 * [Executable stacks are disabled on Linux and BSD][1.8nx].
3094 * The Rust Project now publishes binary releases of the standard
3095 library for a number of tier-2 targets:
3096 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
3097 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
3098 `x86_64-rumprun-netbsd`. These can be installed with
3099 tools such as [multirust][1.8mr].
3104 * [`cargo init` creates a new Cargo project in the current
3105 directory][1.8ci]. It is otherwise like `cargo new`.
3106 * [Cargo has configuration keys for `-v` and
3107 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
3108 `[term]` section of `.cargo/config`.
3109 * [Configuration keys that evaluate to strings or integers can be set
3110 via environment variables][1.8ce]. For example the `build.jobs` key
3111 can be set via `CARGO_BUILD_JOBS`. Environment variables take
3112 precedence over config files.
3113 * [Target-specific dependencies support Rust `cfg` syntax for
3114 describing targets][1.8cfg] so that dependencies for multiple
3115 targets can be specified together. [RFC 1361].
3116 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
3117 `RUSTDOC` take precedence over the `build.target-dir`,
3118 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
3119 * [The child process tree is killed on Windows when Cargo is
3121 * [The `build.target` configuration value sets the target platform,
3122 like `--target`][1.8ct].
3127 * [Unstable compiler flags have been further restricted][1.8u]. Since
3128 1.0 `-Z` flags have been considered unstable, and other flags that
3129 were considered unstable additionally required passing `-Z
3130 unstable-options` to access. Unlike unstable language and library
3131 features though, these options have been accessible on the stable
3132 release channel. Going forward, *new unstable flags will not be
3133 available on the stable release channel*, and old unstable flags
3134 will warn about their usage. In the future, all unstable flags will
3135 be unavailable on the stable release channel.
3136 * [It is no longer possible to `match` on empty enum variants using
3137 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
3138 * The Unix-specific `MetadataExt` traits, including
3139 `os::unix::fs::MetadataExt`, which expose values such as inode
3140 numbers [no longer return platform-specific types][1.8r], but
3141 instead return widened integers. [RFC 1415].
3142 * [Modules sourced from the filesystem cannot appear within arbitrary
3143 blocks, but only within other modules][1.8mf].
3144 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
3145 * On Unix, [stack overflow triggers a runtime abort instead of a
3147 * [`Command::spawn` and its equivalents return an error if any of
3148 its command-line arguments contain interior `NUL`s][1.8n].
3149 * [Tuple and unit enum variants from other crates are in the type
3151 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
3152 type instead of `.a` files][1.8st]. Additionally, for the MSVC
3153 toolchain, `rustc` emits import libraries named `foo.dll.lib`
3154 instead of `foo.lib`.
3157 [1.8a]: https://github.com/rust-lang/rust/pull/30962
3158 [1.8b]: https://github.com/rust-lang/rust/pull/31123
3159 [1.8c]: https://github.com/rust-lang/rust/pull/31530
3160 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
3161 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
3162 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
3163 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
3164 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
3165 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
3166 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
3167 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
3168 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
3169 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
3170 [1.8h]: https://github.com/rust-lang/rust/pull/31460
3171 [1.8l]: https://github.com/rust-lang/rust/pull/31668
3172 [1.8m]: https://github.com/rust-lang/rust/pull/31020
3173 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
3174 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
3175 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
3176 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
3177 [1.8n]: https://github.com/rust-lang/rust/pull/31056
3178 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
3179 [1.8r]: https://github.com/rust-lang/rust/pull/31551
3180 [1.8so]: https://github.com/rust-lang/rust/pull/31333
3181 [1.8st]: https://github.com/rust-lang/rust/pull/29520
3182 [1.8t]: https://github.com/rust-lang/rust/pull/31358
3183 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
3184 [1.8u]: https://github.com/rust-lang/rust/pull/31793
3185 [1.8v]: https://github.com/rust-lang/rust/pull/31757
3186 [1.8w]: https://github.com/rust-lang/rust/pull/31904
3187 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
3188 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
3189 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
3190 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
3191 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
3192 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
3193 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
3194 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
3195 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
3196 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
3197 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
3198 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
3199 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
3200 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
3201 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
3202 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
3203 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
3204 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
3205 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
3206 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
3207 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
3208 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
3209 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
3210 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
3211 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
3212 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
3213 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
3214 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
3215 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
3216 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
3219 Version 1.7.0 (2016-03-03)
3220 ==========================
3227 * [`Path::strip_prefix`][] (renamed from relative_from)
3228 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
3230 * [`Ipv4Addr::is_loopback`]
3231 * [`Ipv4Addr::is_private`]
3232 * [`Ipv4Addr::is_link_local`]
3233 * [`Ipv4Addr::is_multicast`]
3234 * [`Ipv4Addr::is_broadcast`]
3235 * [`Ipv4Addr::is_documentation`]
3237 * [`Ipv6Addr::is_unspecified`]
3238 * [`Ipv6Addr::is_loopback`]
3239 * [`Ipv6Addr::is_multicast`]
3242 * [`Vec::as_mut_slice`]
3244 * [`String::as_str`]
3245 * [`String::as_mut_str`]
3247 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
3249 * `<[T]>::`[`sort_by_key`]
3250 * checked, saturated, and overflowing operations
3251 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
3252 * [`i32::saturating_mul`]
3253 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
3254 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
3255 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
3256 * [`u32::saturating_mul`]
3257 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
3258 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
3259 * and checked, saturated, and overflowing operations for other primitive types
3261 * [`ffi::IntoStringError`]
3262 * [`CString::into_string`]
3263 * [`CString::into_bytes`]
3264 * [`CString::into_bytes_with_nul`]
3265 * `From<CString> for Vec<u8>`
3267 * [`IntoStringError::into_cstring`]
3268 * [`IntoStringError::utf8_error`]
3269 * `Error for IntoStringError`
3271 * [`std::hash::BuildHasher`]
3272 * [`BuildHasher::Hasher`]
3273 * [`BuildHasher::build_hasher`]
3274 * [`std::hash::BuildHasherDefault`]
3275 * [`HashMap::with_hasher`]
3276 * [`HashMap::with_capacity_and_hasher`]
3277 * [`HashSet::with_hasher`]
3278 * [`HashSet::with_capacity_and_hasher`]
3279 * [`std::collections::hash_map::RandomState`]
3280 * [`RandomState::new`]
3281 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
3282 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
3283 from bytes is faster.
3284 * [The performance of `LineWriter` (and thus `io::stdout`) was
3285 improved by using `memchr` to search for newlines][1.7m].
3286 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
3287 `f64` variants were stabilized previously.
3288 * [`BTreeMap` was rewritten to use less memory and improve the performance
3289 of insertion and iteration, the latter by as much as 5x][1.7bm].
3290 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
3291 covariant over their contained type][1.7bt].
3292 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
3293 over their contained type][1.7ll].
3294 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
3296 * [`Any` is implemented for unsized types][1.7a].
3297 * [`Hash` is implemented for `Duration`][1.7h].
3302 * [When running tests with `--test`, rustdoc will pass `--cfg`
3303 arguments to the compiler][1.7dt].
3304 * [The compiler is built with RPATH information by default][1.7rpa].
3305 This means that it will be possible to run `rustc` when installed in
3306 unusual configurations without configuring the dynamic linker search
3308 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
3309 any RPATH entries (emitted with `-C rpath`) *not* take precedence
3310 over `LD_LIBRARY_PATH`.
3315 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
3316 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
3317 * [The `rerun-if-changed` build script directive no longer causes the
3318 build script to incorrectly run twice in certain scenarios][1.7rr].
3323 * Soundness fixes to the interactions between associated types and
3324 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
3325 code that violates the new rules. This is a significant change that
3326 is known to break existing code, so it has emitted warnings for the
3327 new error cases since 1.4 to give crate authors time to adapt. The
3328 details of what is changing are subtle; read the RFC for more.
3329 * [Several bugs in the compiler's visibility calculations were
3330 fixed][1.7v]. Since this was found to break significant amounts of
3331 code, the new errors will be emitted as warnings for several release
3332 cycles, under the `private_in_public` lint.
3333 * Defaulted type parameters were accidentally accepted in positions
3334 that were not intended. In this release, [defaulted type parameters
3335 appearing outside of type definitions will generate a
3336 warning][1.7d], which will become an error in future releases.
3337 * [Parsing "." as a float results in an error instead of 0][1.7p].
3338 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
3339 * [Borrows of closure parameters may not outlive the closure][1.7bc].
3341 [1.7a]: https://github.com/rust-lang/rust/pull/30928
3342 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
3343 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
3344 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
3345 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
3346 [1.7d]: https://github.com/rust-lang/rust/pull/30724
3347 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
3348 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
3349 [1.7f]: https://github.com/rust-lang/rust/pull/30672
3350 [1.7h]: https://github.com/rust-lang/rust/pull/30818
3351 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
3352 [1.7m]: https://github.com/rust-lang/rust/pull/30381
3353 [1.7p]: https://github.com/rust-lang/rust/pull/30681
3354 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
3355 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
3356 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
3357 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
3358 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
3359 [1.7v]: https://github.com/rust-lang/rust/pull/29973
3360 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3361 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3362 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
3363 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
3364 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
3365 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
3366 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
3367 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
3368 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
3369 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
3370 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
3371 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
3372 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
3373 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
3374 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
3375 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
3376 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
3377 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
3378 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
3379 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
3380 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
3381 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
3382 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
3383 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
3384 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
3385 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
3386 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
3387 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
3388 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
3389 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
3390 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
3391 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
3392 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
3393 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
3394 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
3395 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
3396 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
3397 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
3398 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
3399 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
3400 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
3401 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
3402 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
3403 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
3404 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
3405 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
3406 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
3407 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3408 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
3409 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
3410 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
3411 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
3412 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
3413 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
3414 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
3415 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
3416 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
3417 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
3418 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
3419 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
3422 Version 1.6.0 (2016-01-21)
3423 ==========================
3428 * The `#![no_std]` attribute causes a crate to not be linked to the
3429 standard library, but only the [core library][1.6co], as described
3430 in [RFC 1184]. The core library defines common types and traits but
3431 has no platform dependencies whatsoever, and is the basis for Rust
3432 software in environments that cannot support a full port of the
3433 standard library, such as operating systems. Most of the core
3434 library is now stable.
3440 [`Read::read_exact`],
3441 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
3442 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
3443 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
3444 [`os::unix::fs::DirBuilderExt`],
3445 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
3446 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
3447 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
3448 [`collections::hash_map::Drain`],
3449 [`collections::hash_map::HashMap::drain`],
3450 [`collections::hash_set::Drain`],
3451 [`collections::hash_set::HashSet::drain`],
3452 [`collections::binary_heap::Drain`],
3453 [`collections::binary_heap::BinaryHeap::drain`],
3454 [`Vec::extend_from_slice`][] (renamed from `push_all`),
3455 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
3456 [`RwLock::into_inner`],
3457 [`Iterator::min_by_key`][] (renamed from `min_by`),
3458 [`Iterator::max_by_key`][] (renamed from `max_by`).
3459 * The [core library][1.6co] is stable, as are most of its APIs.
3460 * [The `assert_eq!` macro supports arguments that don't implement
3461 `Sized`][1.6ae], such as arrays. In this way it behaves more like
3463 * Several timer functions that take duration in milliseconds [are
3464 deprecated in favor of those that take `Duration`][1.6ms]. These
3465 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
3466 `thread::park_timeout_ms`.
3467 * The algorithm by which `Vec` reserves additional elements was
3468 [tweaked to not allocate excessive space][1.6a] while still growing
3470 * `From` conversions are [implemented from integers to floats][1.6f]
3471 in cases where the conversion is lossless. Thus they are not
3472 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
3473 or `f64`. They are also not implemented for `isize` and `usize`
3474 because the implementations would be platform-specific. `From` is
3475 also implemented from `f32` to `f64`.
3476 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
3477 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
3478 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
3479 * [`BinaryHeap` was refactored][1.6bh] for modest performance
3481 * Sorting slices that are already sorted [is 50% faster in some
3487 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
3488 * Cargo build scripts can specify their dependencies by emitting the
3489 [`rerun-if-changed`][1.6rr] key.
3490 * crates.io will reject publication of crates with dependencies that
3491 have a wildcard version constraint. Crates with wildcard
3492 dependencies were seen to cause a variety of problems, as described
3493 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
3495 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
3496 release folder. A variety of artifacts that Cargo failed to clean
3497 are now correctly deleted.
3502 * The `unreachable_code` lint [warns when a function call's argument
3504 * The parser indicates [failures that may be caused by
3505 confusingly-similar Unicode characters][1.6uc]
3506 * Certain macro errors [are reported at definition time][1.6m], not
3512 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
3513 environment variable when locating crates. This was a pre-cargo
3514 feature for integrating with the package manager that was
3515 accidentally never removed.
3516 * [A number of bugs were fixed in the privacy checker][1.6p] that
3517 could cause previously-accepted code to break.
3518 * [Modules and unit/tuple structs may not share the same name][1.6ts].
3519 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
3520 struct pattern syntax (`Foo(..)`) can no longer be used to match
3521 unit structs. This is a warning now, but will become an error in
3522 future releases. Patterns that share the same name as a const are
3524 * A bug was fixed that causes [rustc not to apply default type
3525 parameters][1.6xc] when resolving certain method implementations of
3526 traits defined in other crates.
3528 [1.6a]: https://github.com/rust-lang/rust/pull/29454
3529 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
3530 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
3531 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
3532 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
3533 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
3534 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
3535 [1.6f]: https://github.com/rust-lang/rust/pull/29129
3536 [1.6m]: https://github.com/rust-lang/rust/pull/29828
3537 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
3538 [1.6p]: https://github.com/rust-lang/rust/pull/29726
3539 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
3540 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
3541 [1.6s]: https://github.com/rust-lang/rust/pull/29675
3542 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
3543 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
3544 [1.6us]: https://github.com/rust-lang/rust/pull/29383
3545 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
3546 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
3547 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3548 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
3549 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
3550 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
3551 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
3552 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
3553 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
3554 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
3555 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
3556 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
3557 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
3558 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
3559 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
3560 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
3561 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
3562 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
3563 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
3564 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
3565 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
3566 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
3567 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
3568 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
3569 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
3570 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
3571 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
3572 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
3573 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
3574 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
3577 Version 1.5.0 (2015-12-10)
3578 ==========================
3580 * ~700 changes, numerous bugfixes
3586 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
3587 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
3588 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
3589 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
3590 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
3591 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
3592 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
3593 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
3594 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
3595 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
3596 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
3597 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
3598 [`Path::read_link`], [`Path::symlink_metadata`],
3599 [`Utf8Error::valid_up_to`], [`Vec::resize`],
3600 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
3601 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
3602 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
3603 [`slice::split_first_mut`], [`slice::split_first`],
3604 [`slice::split_last_mut`], [`slice::split_last`],
3605 [`char::from_u32_unchecked`], [`fs::canonicalize`],
3606 [`str::MatchIndices`], [`str::RMatchIndices`],
3607 [`str::match_indices`], [`str::rmatch_indices`],
3608 [`str::slice_mut_unchecked`], [`string::ParseError`].
3609 * Rust applications hosted on crates.io can be installed locally to
3610 `~/.cargo/bin` with the [`cargo install`] command. Among other
3611 things this makes it easier to augment Cargo with new subcommands:
3612 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
3613 invoked as `cargo foo`.
3614 * Crates with wildcard (`*`) dependencies will [emit warnings when
3615 published][1.5w]. In 1.6 it will no longer be possible to publish
3616 crates with wildcard dependencies.
3621 * The rules determining when a particular lifetime must outlive
3622 a particular value (known as '[dropck]') have been [modified
3623 to not rely on parametricity][1.5p].
3624 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
3625 and `Arc`][1.5a]. Because these smart pointer types implement
3626 `Deref`, this causes breakage in cases where the interior type
3627 contains methods of the same name.
3628 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
3629 that they could drop their content. Soundness fix.
3630 * All method invocations are [properly checked][1.5wf1] for
3631 [well-formedness][1.5wf2]. Soundness fix.
3632 * Traits whose supertraits contain `Self` are [not object
3633 safe][1.5o]. Soundness fix.
3634 * Target specifications support a [`no_default_libraries`][1.5nd]
3635 setting that controls whether `-nodefaultlibs` is passed to the
3636 linker, and in turn the `is_like_windows` setting no longer affects
3637 the `-nodefaultlibs` flag.
3638 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
3639 * The `#[inline]` and `#[repr]` attributes [can only appear
3640 in valid locations][1.5at].
3641 * Native libraries linked from the local crate are [passed to
3642 the linker before native libraries from upstream crates][1.5nl].
3643 * Two rarely-used attributes, `#[no_debug]` and
3644 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
3645 * Negation of unsigned integers, which has been a warning for
3646 several releases, [is now behind a feature gate and will
3647 generate errors][1.5nu].
3648 * The parser accidentally accepted visibility modifiers on
3649 enum variants, a bug [which has been fixed][1.5ev].
3650 * [A bug was fixed that allowed `use` statements to import unstable
3656 * When evaluating expressions at compile-time that are not
3657 compile-time constants (const-evaluating expressions in non-const
3658 contexts), incorrect code such as overlong bitshifts and arithmetic
3659 overflow will [generate a warning instead of an error][1.5ce],
3660 delaying the error until runtime. This will allow the
3661 const-evaluator to be expanded in the future backwards-compatibly.
3662 * The `improper_ctypes` lint [no longer warns about using `isize` and
3663 `usize` in FFI][1.5ict].
3668 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
3670 * `Default` is [implemented for mutable slices][1.5d].
3671 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
3672 * There are now `From` conversions [between floating point
3673 types][1.5f] where the conversions are lossless.
3674 * There are now `From` conversions [between integer types][1.5i] where
3675 the conversions are lossless.
3676 * [`fs::Metadata` implements `Clone`][1.5fs].
3677 * The `parse` method [accepts a leading "+" when parsing
3679 * [`AsMut` is implemented for `Vec`][1.5am].
3680 * The `clone_from` implementations for `String` and `BinaryHeap` [have
3681 been optimized][1.5cf] and no longer rely on the default impl.
3682 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
3683 `unsafe extern "C"` function types now [implement `Clone`,
3684 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
3685 `fmt::Debug` for up to 12 arguments][1.5fp].
3686 * [Dropping `Vec`s is much faster in unoptimized builds when the
3687 element types don't implement `Drop`][1.5dv].
3688 * A bug that caused in incorrect behavior when [combining `VecDeque`
3689 with zero-sized types][1.5vdz] was resolved.
3690 * [`PartialOrd` for slices is faster][1.5po].
3695 * [Crate metadata size was reduced by 20%][1.5md].
3696 * [Improvements to code generation reduced the size of libcore by 3.3
3697 MB and rustc's memory usage by 18MB][1.5m].
3698 * [Improvements to deref translation increased performance in
3699 unoptimized builds][1.5dr].
3700 * Various errors in trait resolution [are deduplicated to only be
3701 reported once][1.5te].
3702 * Rust has preliminary [support for rumprun kernels][1.5rr].
3703 * Rust has preliminary [support for NetBSD on amd64][1.5na].
3705 [1.5use]: https://github.com/rust-lang/rust/pull/28364
3706 [1.5po]: https://github.com/rust-lang/rust/pull/28436
3707 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
3708 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
3709 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
3710 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
3711 [1.5md]: https://github.com/rust-lang/rust/pull/28521
3712 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
3713 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
3714 [1.5na]: https://github.com/rust-lang/rust/pull/28543
3715 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
3716 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
3717 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
3718 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
3719 [1.5te]: https://github.com/rust-lang/rust/pull/28645
3720 [1.5at]: https://github.com/rust-lang/rust/pull/28650
3721 [1.5am]: https://github.com/rust-lang/rust/pull/28663
3722 [1.5m]: https://github.com/rust-lang/rust/pull/28778
3723 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
3724 [1.5a]: https://github.com/rust-lang/rust/pull/28811
3725 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
3726 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
3727 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
3728 [1.5i]: https://github.com/rust-lang/rust/pull/28921
3729 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
3730 [1.5f]: https://github.com/rust-lang/rust/pull/29129
3731 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
3732 [1.5s]: https://github.com/rust-lang/rust/pull/29190
3733 [1.5d]: https://github.com/rust-lang/rust/pull/29245
3734 [1.5o]: https://github.com/rust-lang/rust/pull/29259
3735 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
3736 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3737 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
3738 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
3739 [1.5c]: https://github.com/rust-lang/rust/pull/29110
3740 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3741 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
3742 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
3743 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
3744 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
3745 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
3746 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
3747 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
3748 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
3749 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
3750 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
3751 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
3752 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
3753 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
3754 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
3755 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
3756 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
3757 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
3758 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
3759 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
3760 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
3761 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
3762 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
3763 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
3764 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
3765 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
3766 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
3767 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
3768 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
3769 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
3770 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
3771 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
3772 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
3773 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
3774 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
3775 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
3776 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
3777 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
3778 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
3779 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
3780 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
3781 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
3782 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
3783 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
3784 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
3785 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
3786 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
3787 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
3788 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
3789 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
3790 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
3791 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
3792 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
3793 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
3795 Version 1.4.0 (2015-10-29)
3796 ==========================
3798 * ~1200 changes, numerous bugfixes
3803 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
3804 GNU) are now supported and recommended for use.
3809 * [Several changes have been made to fix type soundness and improve
3810 the behavior of associated types][sound]. See [RFC 1214]. Although
3811 we have mostly introduced these changes as warnings this release, to
3812 become errors next release, there are still some scenarios that will
3813 see immediate breakage.
3814 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
3815 line breaks in addition to `\n`][crlf].
3816 * [Loans of `'static` lifetime extend to the end of a function][stat].
3817 * [`str::parse` no longer introduces avoidable rounding error when
3818 parsing floating point numbers. Together with earlier changes to
3819 float formatting/output, "round trips" like f.to_string().parse()
3820 now preserve the value of f exactly. Additionally, leading plus
3821 signs are now accepted][fp3].
3827 * `use` statements that import multiple items [can now rename
3828 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
3829 * [Binops work correctly on fat pointers][binfat].
3830 * `pub extern crate`, which does not behave as expected, [issues a
3831 warning][pec] until a better solution is found.
3836 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
3837 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
3838 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
3839 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
3840 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
3841 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
3842 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
3843 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
3844 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
3845 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
3846 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
3847 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
3848 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
3849 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
3850 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
3851 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
3852 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
3853 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
3855 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
3856 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
3857 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
3858 `f64::from_str_radix`.
3859 * [Reverse-searching strings is faster with the 'two-way'
3861 * [`std::io::copy` allows `?Sized` arguments][cc].
3862 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
3863 [override `count`, `nth` and `last` with an O(1)
3864 implementation][it].
3865 * [`Default` is implemented for arrays up to `[T; 32]`][d].
3866 * [`IntoRawFd` has been added to the Unix-specific prelude,
3867 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
3869 * [`Extend<String>` and `FromIterator<String` are both implemented for
3871 * [`IntoIterator` is implemented for references to `Option` and
3873 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
3874 Copy`][ext] as part of [RFC 839]. This will cause type inference
3875 breakage in rare situations.
3876 * [`BinaryHeap` implements `Debug`][bh2].
3877 * [`Borrow` and `BorrowMut` are implemented for fixed-size
3879 * [`extern fn`s with the "Rust" and "C" ABIs implement common
3880 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
3881 * [String comparison is faster][faststr].
3882 * `&mut T` where `T: std::fmt::Write` [also implements
3883 `std::fmt::Write`][mutw].
3884 * [A stable regression in `VecDeque::push_back` and other
3885 capacity-altering methods that caused panics for zero-sized types
3887 * [Function pointers implement traits for up to 12 parameters][fp2].
3892 * The compiler [no longer uses the 'morestack' feature to prevent
3893 stack overflow][mm]. Instead it uses guard pages and stack
3894 probes (though stack probes are not yet implemented on any platform
3896 * [The compiler matches traits faster when projections are involved][p].
3897 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
3899 * [Cargo now displays useful information about what its doing during
3900 `cargo update`][cu].
3902 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
3903 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
3904 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
3905 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
3906 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
3907 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
3908 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
3909 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
3910 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
3911 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
3912 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
3913 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
3914 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
3915 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
3916 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
3917 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
3918 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
3919 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
3920 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3921 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3922 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3923 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3924 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3925 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3926 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3927 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3928 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
3929 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
3930 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
3931 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
3932 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
3933 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
3934 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
3935 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
3936 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
3937 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
3938 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
3939 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
3940 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
3941 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
3942 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
3943 [bh2]: https://github.com/rust-lang/rust/pull/28156
3944 [binfat]: https://github.com/rust-lang/rust/pull/28270
3945 [bm]: https://github.com/rust-lang/rust/pull/28197
3946 [cc]: https://github.com/rust-lang/rust/pull/27531
3947 [crlf]: https://github.com/rust-lang/rust/pull/28034
3948 [cu]: https://github.com/rust-lang/cargo/pull/1931
3949 [d]: https://github.com/rust-lang/rust/pull/27825
3950 [dep]: https://github.com/rust-lang/rust/pull/28339
3951 [es]: https://github.com/rust-lang/rust/pull/27956
3952 [ext]: https://github.com/rust-lang/rust/pull/28094
3953 [faststr]: https://github.com/rust-lang/rust/pull/28338
3954 [ffi]: https://github.com/rust-lang/rust/pull/28779
3955 [fp]: https://github.com/rust-lang/rust/pull/28268
3956 [fp2]: https://github.com/rust-lang/rust/pull/28560
3957 [fp3]: https://github.com/rust-lang/rust/pull/27307
3958 [i]: https://github.com/rust-lang/rust/pull/27451
3959 [into2]: https://github.com/rust-lang/rust/pull/28039
3960 [it]: https://github.com/rust-lang/rust/pull/27652
3961 [mm]: https://github.com/rust-lang/rust/pull/27338
3962 [mutw]: https://github.com/rust-lang/rust/pull/28368
3963 [sound]: https://github.com/rust-lang/rust/pull/27641
3964 [p]: https://github.com/rust-lang/rust/pull/27866
3965 [pec]: https://github.com/rust-lang/rust/pull/28486
3966 [pr]: https://github.com/rust-lang/rust/pull/27896
3967 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
3968 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3969 [s]: https://github.com/rust-lang/rust/pull/27474
3970 [stab]: https://github.com/rust-lang/rust/pull/28339
3971 [stat]: https://github.com/rust-lang/rust/pull/28321
3972 [vd]: https://github.com/rust-lang/rust/pull/28494
3974 Version 1.3.0 (2015-09-17)
3975 ==============================
3977 * ~900 changes, numerous bugfixes
3982 * The [new object lifetime defaults][nold] have been [turned
3983 on][nold2] after a cycle of warnings about the change. Now types
3984 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
3985 being interpreted as `&'a Box<Trait+'a>` to `&'a
3986 Box<Trait+'static>`.
3987 * [The Rustonomicon][nom] is a new book in the official documentation
3988 that dives into writing unsafe Rust.
3989 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
3990 timekeeping is employed by other std APIs, as well as out-of-tree
3996 * The [new object lifetime defaults][nold] have been [turned
3997 on][nold2] after a cycle of warnings about the change.
3998 * There is a known [regression][lr] in how object lifetime elision is
3999 interpreted, the proper solution for which is undetermined.
4000 * The `#[prelude_import]` attribute, an internal implementation
4001 detail, was accidentally stabilized previously. [It has been put
4002 behind the `prelude_import` feature gate][pi]. This change is
4003 believed to break no existing code.
4004 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4005 [more sane for dynamically sized types][dst3]. Code that relied on
4006 the previous behavior is thought to be broken.
4007 * The `dropck` rules, which checks that destructors can't access
4008 destroyed values, [have been updated][dropck] to match the
4009 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
4010 cause some previously-compiling code to no longer build.
4015 * The [new object lifetime defaults][nold] have been [turned
4016 on][nold2] after a cycle of warnings about the change.
4017 * Semicolons may [now follow types and paths in
4018 macros](https://github.com/rust-lang/rust/pull/27000).
4019 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
4020 [more sane for dynamically sized types][dst3]. Code that relied on
4021 the previous behavior is not known to exist, and suspected to be
4023 * `'static` variables [may now be recursive][st].
4024 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
4025 implementations correctly.
4026 * The `dropck` rules, which checks that destructors can't access
4027 destroyed values, [have been updated][dropck] to match the
4033 * The [`Duration`] API, [has been stabilized][ds], as well as the
4034 `std::time` module, which presently contains only `Duration`.
4035 * `Box<str>` and `Box<[T]>` both implement `Clone`.
4036 * The owned C string, [`CString`], implements [`Borrow`] and the
4037 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
4038 these allow C strings to be borrowed and cloned in generic code.
4039 * [`CStr`] implements [`Debug`].
4040 * [`AtomicPtr`] implements [`Debug`].
4041 * [`Error`] trait objects [can be downcast to their concrete types][e]
4042 in many common configurations, using the [`is`], [`downcast`],
4043 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
4045 * Searching for substrings now [employs the two-way algorithm][search]
4046 instead of doing a naive search. This gives major speedups to a
4047 number of methods, including [`contains`][sc], [`find`][sf],
4048 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
4049 [`ends_with`][sew] are also faster.
4050 * The performance of `PartialEq` for slices is [much faster][ps].
4051 * The [`Hash`] trait offers the default method, [`hash_slice`], which
4052 is overridden and optimized by the implementations for scalars.
4053 * The [`Hasher`] trait now has a number of specialized `write_*`
4054 methods for primitive types, for efficiency.
4055 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
4056 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
4057 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
4058 of [`std::error::Error::cause`][iec] also delegates to the inner
4060 * [`process::Child`][pc] gained the [`id`] method, which returns a
4061 `u32` representing the platform-specific process identifier.
4062 * The [`connect`] method on slices is deprecated, replaced by the new
4063 [`join`] method (note that both of these are on the *unstable*
4064 [`SliceConcatExt`] trait, but through the magic of the prelude are
4065 available to stable code anyway).
4066 * The [`Div`] operator is implemented for [`Wrapping`] types.
4067 * [`DerefMut` is implemented for `String`][dms].
4068 * Performance of SipHash (the default hasher for `HashMap`) is
4069 [better for long data][sh].
4070 * [`AtomicPtr`] implements [`Send`].
4071 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
4072 are now [specialized to use uninitialized buffers for increased
4074 * Lifetime parameters of foreign functions [are now resolved
4080 * Rust can now, with some coercion, [produce programs that run on
4081 Windows XP][xp], though XP is not considered a supported platform.
4082 * Porting Rust on Windows from the GNU toolchain to MSVC continues
4083 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
4084 recommended for use in 1.3, though should be fully-functional
4085 in the [64-bit 1.4 beta][b14].
4086 * On Fedora-based systems installation will [properly configure the
4087 dynamic linker][fl].
4088 * The compiler gained many new extended error descriptions, which can
4089 be accessed with the `--explain` flag.
4090 * The `dropck` pass, which checks that destructors can't access
4091 destroyed values, [has been rewritten][dropck]. This fixes some
4092 soundness holes, and as such will cause some previously-compiling
4093 code to no longer build.
4094 * `rustc` now uses [LLVM to write archive files where possible][ar].
4095 Eventually this will eliminate the compiler's dependency on the ar
4097 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
4098 supported FreeBSD on x86_64).
4099 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
4100 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
4102 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
4103 will kill the process instead of leaking][nlp].
4105 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
4106 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
4107 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
4108 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
4109 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
4110 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4111 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4112 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
4113 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
4114 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
4115 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
4116 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
4117 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
4118 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4119 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
4120 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
4121 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
4122 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
4123 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4124 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
4125 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
4126 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
4127 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
4128 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4129 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
4130 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
4131 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
4132 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
4133 [ar]: https://github.com/rust-lang/rust/pull/26926
4134 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
4135 [dms]: https://github.com/rust-lang/rust/pull/26241
4136 [dropck]: https://github.com/rust-lang/rust/pull/27261
4137 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4138 [ds]: https://github.com/rust-lang/rust/pull/26818
4139 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
4140 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
4141 [dst3]: https://github.com/rust-lang/rust/pull/27351
4142 [e]: https://github.com/rust-lang/rust/pull/24793
4143 [f]: https://github.com/rust-lang/rust/pull/26588
4144 [fb]: https://github.com/rust-lang/rust/pull/26959
4145 [fl]: https://github.com/rust-lang/rust-installer/pull/41
4146 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
4147 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
4148 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
4149 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
4150 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
4151 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
4152 [lic]: https://github.com/rust-lang/rust/pull/26583
4153 [lnu]: https://github.com/rust-lang/rust/pull/27026
4154 [lr]: https://github.com/rust-lang/rust/issues/27248
4155 [lum]: https://github.com/rust-lang/rust/pull/26378
4156 [lur]: https://github.com/rust-lang/rust/pull/26783
4157 [nlp]: https://github.com/rust-lang/rust/pull/27176
4158 [nold2]: https://github.com/rust-lang/rust/pull/27045
4159 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
4160 [nom]: http://doc.rust-lang.org/nightly/nomicon/
4161 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
4162 [pi]: https://github.com/rust-lang/rust/pull/26699
4163 [ps]: https://github.com/rust-lang/rust/pull/26884
4164 [rte]: https://github.com/rust-lang/rust/pull/26950
4165 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
4166 [search]: https://github.com/rust-lang/rust/pull/26327
4167 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
4168 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
4169 [sh]: https://github.com/rust-lang/rust/pull/27280
4170 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
4171 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
4172 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
4173 [st]: https://github.com/rust-lang/rust/pull/26630
4174 [win1]: https://github.com/rust-lang/rust/pull/26569
4175 [win2]: https://github.com/rust-lang/rust/pull/26741
4176 [win3]: https://github.com/rust-lang/rust/pull/26741
4177 [win4]: https://github.com/rust-lang/rust/pull/27210
4178 [xp]: https://github.com/rust-lang/rust/pull/26569
4180 Version 1.2.0 (2015-08-07)
4181 ==========================
4183 * ~1200 changes, numerous bugfixes
4188 * [Dynamically-sized-type coercions][dst] allow smart pointer types
4189 like `Rc` to contain types without a fixed size, arrays and trait
4190 objects, finally enabling use of `Rc<[T]>` and completing the
4191 implementation of DST.
4192 * [Parallel codegen][parcodegen] is now working again, which can
4193 substantially speed up large builds in debug mode; It also gets
4194 another ~33% speedup when bootstrapping on a 4 core machine (using 8
4195 jobs). It's not enabled by default, but will be "in the near
4196 future". It can be activated with the `-C codegen-units=N` flag to
4198 * This is the first release with [experimental support for linking
4199 with the MSVC linker and lib C on Windows (instead of using the GNU
4200 variants via MinGW)][win]. It is yet recommended only for the most
4201 intrepid Rustaceans.
4202 * Benchmark compilations are showing a 30% improvement in
4203 bootstrapping over 1.1.
4208 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
4209 unicode case mapping, which is a previously-planned change in
4210 behavior and considered a bugfix.
4211 * [`mem::align_of`] now specifies [the *minimum alignment* for
4212 T][align], which is usually the alignment programs are interested
4213 in, and the same value reported by clang's
4214 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
4216 * [The `#[packed]` attribute is no longer silently accepted by the
4217 compiler][packed]. This attribute did nothing and code that
4218 mentioned it likely did not work as intended.
4219 * Associated type defaults are [now behind the
4220 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
4221 defaults *did not work*, but could be mentioned syntactically. As
4222 such this breakage has minimal impact.
4227 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
4228 matching against dereferencable values.
4233 * The [`Extend`] trait, which grows a collection from an iterator, is
4234 implemented over iterators of references, for `String`, `Vec`,
4235 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
4236 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
4237 * The [`iter::once`] function returns an iterator that yields a single
4238 element, and [`iter::empty`] returns an iterator that yields no
4240 * The [`matches`] and [`rmatches`] methods on `str` return iterators
4241 over substring matches.
4242 * [`Cell`] and [`RefCell`] both implement `Eq`.
4243 * A number of methods for wrapping arithmetic are added to the
4244 integral types, [`wrapping_div`], [`wrapping_rem`],
4245 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
4246 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
4247 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
4248 type.. It is illegal for the default arithmetic operations in Rust
4249 to overflow; the desire to wrap must be explicit.
4250 * The `{:#?}` formatting specifier [displays the alternate,
4251 pretty-printed][debugfmt] form of the `Debug` formatter. This
4252 feature was actually introduced prior to 1.0 with little
4254 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
4255 for writing data to formatted strings, similar to [`io::Write`].
4256 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
4257 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
4258 are used by code generators to emit implementations of [`Debug`].
4259 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
4260 methods that convert case, following Unicode case mapping.
4261 * It is now easier to handle poisoned locks. The [`PoisonError`]
4262 type, returned by failing lock operations, exposes `into_inner`,
4263 `get_ref`, and `get_mut`, which all give access to the inner lock
4264 guard, and allow the poisoned lock to continue to operate. The
4265 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
4266 poisoned lock without attempting to take the lock.
4267 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
4268 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
4269 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
4270 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
4272 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
4278 * `rustc` employs smarter heuristics for guessing at [typos].
4279 * `rustc` emits more efficient code for [no-op conversions between
4280 unsafe pointers][nop].
4281 * Fat pointers are now [passed in pairs of immediate arguments][fat],
4282 resulting in faster compile times and smaller code.
4284 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
4285 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
4286 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
4287 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
4288 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
4289 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
4290 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
4291 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
4292 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
4293 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
4294 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
4295 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
4296 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
4297 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
4298 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
4299 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
4300 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
4301 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
4302 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
4303 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
4304 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
4305 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
4306 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
4307 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
4308 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
4309 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
4310 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
4311 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
4312 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
4313 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
4314 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
4315 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
4316 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
4317 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4318 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4319 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
4320 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
4321 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
4322 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
4323 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
4324 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
4325 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
4326 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
4327 [align]: https://github.com/rust-lang/rust/pull/25646
4328 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
4329 [typos]: https://github.com/rust-lang/rust/pull/26087
4330 [nop]: https://github.com/rust-lang/rust/pull/26336
4331 [fat]: https://github.com/rust-lang/rust/pull/26411
4332 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
4333 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
4334 [packed]: https://github.com/rust-lang/rust/pull/25541
4335 [ad]: https://github.com/rust-lang/rust/pull/27382
4336 [win]: https://github.com/rust-lang/rust/pull/25350
4338 Version 1.1.0 (2015-06-25)
4339 =========================
4341 * ~850 changes, numerous bugfixes
4346 * The [`std::fs` module has been expanded][fs] to expand the set of
4347 functionality exposed:
4348 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
4349 don't incur a syscall on some platforms.
4350 * A `symlink_metadata` function has been added.
4351 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
4352 access to all underlying information.
4353 * The compiler now contains extended explanations of many errors. When an error
4354 with an explanation occurs the compiler suggests using the `--explain` flag
4355 to read the explanation. Error explanations are also [available online][err-index].
4356 * Thanks to multiple [improvements][sk] to [type checking][pre], as
4357 well as other work, the time to bootstrap the compiler decreased by
4363 * The [`str::split_whitespace`] method splits a string on unicode
4364 whitespace boundaries.
4365 * On both Windows and Unix, new extension traits provide conversion of
4366 I/O types to and from the underlying system handles. On Unix, these
4367 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
4368 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
4369 `TcpListener`, and `UpdSocket`. Further implementations for
4370 `std::process` will be stabilized later.
4371 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
4372 Windows, symlinks can be created with
4373 `std::os::windows::symlink_dir` and
4374 `std::os::windows::symlink_file`.
4375 * The `mpsc::Receiver` type can now be converted into an iterator with
4376 `into_iter` on the [`IntoIterator`] trait.
4377 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
4378 implementation of the [`From`] trait.
4379 * The `Debug` implementation for `RangeFull` [creates output that is
4380 more consistent with other implementations][rf].
4381 * [`Debug` is implemented for `File`][file].
4382 * The `Default` implementation for `Arc` [no longer requires `Sync +
4384 * [The `Iterator` methods `count`, `nth`, and `last` have been
4385 overridden for slices to have O(1) performance instead of O(n)][si].
4386 * Incorrect handling of paths on Windows has been improved in both the
4387 compiler and the standard library.
4388 * [`AtomicPtr` gained a `Default` implementation][ap].
4389 * In accordance with Rust's policy on arithmetic overflow `abs` now
4390 [panics on overflow when debug assertions are enabled][abs].
4391 * The [`Cloned`] iterator, which was accidentally left unstable for
4392 1.0 [has been stabilized][c].
4393 * The [`Incoming`] iterator, which iterates over incoming TCP
4394 connections, and which was accidentally unnamable in 1.0, [is now
4395 properly exported][inc].
4396 * [`BinaryHeap`] no longer corrupts itself [when functions called by
4397 `sift_up` or `sift_down` panic][bh].
4398 * The [`split_off`] method of `LinkedList` [no longer corrupts
4399 the list in certain scenarios][ll].
4404 * Type checking performance [has improved notably][sk] with
4405 [multiple improvements][pre].
4406 * The compiler [suggests code changes][ch] for more errors.
4407 * rustc and it's build system have experimental support for [building
4408 toolchains against MUSL][m] instead of glibc on Linux.
4409 * The compiler defines the `target_env` cfg value, which is used for
4410 distinguishing toolchains that are otherwise for the same
4411 platform. Presently this is set to `gnu` for common GNU Linux
4412 targets and for MinGW targets, and `musl` for MUSL Linux targets.
4413 * The [`cargo rustc`][crc] command invokes a build with custom flags
4415 * [Android executables are always position independent][pie].
4416 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
4419 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
4420 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
4421 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
4422 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
4423 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
4424 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
4425 [rf]: https://github.com/rust-lang/rust/pull/24491
4426 [err-index]: https://doc.rust-lang.org/error-index.html
4427 [sk]: https://github.com/rust-lang/rust/pull/24615
4428 [pre]: https://github.com/rust-lang/rust/pull/25323
4429 [file]: https://github.com/rust-lang/rust/pull/24598
4430 [ch]: https://github.com/rust-lang/rust/pull/24683
4431 [arc]: https://github.com/rust-lang/rust/pull/24695
4432 [si]: https://github.com/rust-lang/rust/pull/24701
4433 [ap]: https://github.com/rust-lang/rust/pull/24834
4434 [m]: https://github.com/rust-lang/rust/pull/24777
4435 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
4436 [crc]: https://github.com/rust-lang/cargo/pull/1568
4437 [pie]: https://github.com/rust-lang/rust/pull/24953
4438 [abs]: https://github.com/rust-lang/rust/pull/25441
4439 [c]: https://github.com/rust-lang/rust/pull/25496
4440 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
4441 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
4442 [inc]: https://github.com/rust-lang/rust/pull/25522
4443 [bh]: https://github.com/rust-lang/rust/pull/25856
4444 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
4445 [ll]: https://github.com/rust-lang/rust/pull/26022
4446 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
4447 [drop]: https://github.com/rust-lang/rust/pull/24935
4449 Version 1.0.0 (2015-05-15)
4450 ========================
4452 * ~1500 changes, numerous bugfixes
4457 * The vast majority of the standard library is now `#[stable]`. It is
4458 no longer possible to use unstable features with a stable build of
4460 * Many popular crates on [crates.io] now work on the stable release
4462 * Arithmetic on basic integer types now [checks for overflow in debug
4468 * Several [restrictions have been added to trait coherence][coh] in
4469 order to make it easier for upstream authors to change traits
4470 without breaking downstream code.
4471 * Digits of binary and octal literals are [lexed more eagerly][lex] to
4472 improve error messages and macro behavior. For example, `0b1234` is
4473 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
4474 * Trait bounds [are always invariant][inv], eliminating the need for
4475 the `PhantomFn` and `MarkerTrait` lang items, which have been
4477 * ["-" is no longer a valid character in crate names][cr], the `extern crate
4478 "foo" as bar` syntax has been replaced with `extern crate foo as
4479 bar`, and Cargo now automatically translates "-" in *package* names
4480 to underscore for the crate name.
4481 * [Lifetime shadowing is an error][lt].
4482 * [`Send` no longer implies `'static`][send-rfc].
4483 * [UFCS now supports trait-less associated paths][moar-ufcs] like
4484 `MyType::default()`.
4485 * Primitive types [now have inherent methods][prim-inherent],
4486 obviating the need for extension traits like `SliceExt`.
4487 * Methods with `Self: Sized` in their `where` clause are [considered
4488 object-safe][self-sized], allowing many extension traits like
4489 `IteratorExt` to be merged into the traits they extended.
4490 * You can now [refer to associated types][assoc-where] whose
4491 corresponding trait bounds appear only in a `where` clause.
4492 * The final bits of [OIBIT landed][oibit-final], meaning that traits
4493 like `Send` and `Sync` are now library-defined.
4494 * A [Reflect trait][reflect] was introduced, which means that
4495 downcasting via the `Any` trait is effectively limited to concrete
4496 types. This helps retain the potentially-important "parametricity"
4497 property: generic code cannot behave differently for different type
4498 arguments except in minor ways.
4499 * The `unsafe_destructor` feature is now deprecated in favor of the
4500 [new `dropck`][dropck]. This change is a major reduction in unsafe
4506 * The `thread_local` module [has been renamed to `std::thread`][th].
4507 * The methods of `IteratorExt` [have been moved to the `Iterator`
4509 * Several traits that implement Rust's conventions for type
4510 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
4511 [centralized in the `std::convert` module][con].
4512 * The `FromError` trait [was removed in favor of `From`][fe].
4513 * The basic sleep function [has moved to
4514 `std::thread::sleep_ms`][slp].
4515 * The `splitn` function now takes an `n` parameter that represents the
4516 number of items yielded by the returned iterator [instead of the
4517 number of 'splits'][spl].
4518 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
4519 * [Derived implementations of `PartialOrd` now order enums according
4520 to their explicitly-assigned discriminants][po].
4521 * [Methods for searching strings are generic over `Pattern`s][pat],
4522 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
4524 * [In method resolution, object methods are resolved before inherent
4526 * [`String::from_str` has been deprecated in favor of the `From` impl,
4527 `String::from`][sf].
4528 * [`io::Error` implements `Sync`][ios].
4529 * [The `words` method on `&str` has been replaced with
4530 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
4532 * The new path and IO modules are complete and `#[stable]`. This
4533 was the major library focus for this cycle.
4534 * The path API was [revised][path-normalize] to normalize `.`,
4535 adjusting the tradeoffs in favor of the most common usage.
4536 * A large number of remaining APIs in `std` were also stabilized
4537 during this cycle; about 75% of the non-deprecated API surface
4539 * The new [string pattern API][string-pattern] landed, which makes
4540 the string slice API much more internally consistent and flexible.
4541 * A new set of [generic conversion traits][conversion] replaced
4542 many existing ad hoc traits.
4543 * Generic numeric traits were [completely removed][num-traits]. This
4544 was made possible thanks to inherent methods for primitive types,
4545 and the removal gives maximal flexibility for designing a numeric
4546 hierarchy in the future.
4547 * The `Fn` traits are now related via [inheritance][fn-inherit]
4548 and provide ergonomic [blanket implementations][fn-blanket].
4549 * The `Index` and `IndexMut` traits were changed to
4550 [take the index by value][index-value], enabling code like
4551 `hash_map["string"]` to work.
4552 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
4553 `Copy` data is known to be `Clone` as well.
4558 * Many errors now have extended explanations that can be accessed with
4559 the `--explain` flag to `rustc`.
4560 * Many new examples have been added to the standard library
4562 * rustdoc has received a number of improvements focused on completion
4564 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
4565 * Much headway was made on ecosystem-wide CI, making it possible
4566 to [compare builds for breakage][ci-compare].
4569 [crates.io]: http://crates.io
4570 [clo]: https://github.com/rust-lang/rust/pull/24034
4571 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
4572 [con]: https://github.com/rust-lang/rust/pull/23875
4573 [cr]: https://github.com/rust-lang/rust/pull/23419
4574 [fe]: https://github.com/rust-lang/rust/pull/23879
4575 [ie]: https://github.com/rust-lang/rust/pull/23300
4576 [inv]: https://github.com/rust-lang/rust/pull/23938
4577 [ios]: https://github.com/rust-lang/rust/pull/24133
4578 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
4579 [lt]: https://github.com/rust-lang/rust/pull/24057
4580 [meth]: https://github.com/rust-lang/rust/pull/24056
4581 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
4582 [po]: https://github.com/rust-lang/rust/pull/24270
4583 [sf]: https://github.com/rust-lang/rust/pull/24517
4584 [slp]: https://github.com/rust-lang/rust/pull/23949
4585 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
4586 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
4587 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
4588 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
4589 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
4590 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
4591 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
4592 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
4593 [self-sized]: https://github.com/rust-lang/rust/pull/22301
4594 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
4595 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
4596 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
4597 [reflect]: https://github.com/rust-lang/rust/pull/23712
4598 [conversion]: https://github.com/rust-lang/rfcs/pull/529
4599 [num-traits]: https://github.com/rust-lang/rust/pull/23549
4600 [index-value]: https://github.com/rust-lang/rust/pull/23601
4601 [dropck]: https://github.com/rust-lang/rfcs/pull/769
4602 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
4603 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
4604 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
4605 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
4606 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
4609 Version 1.0.0-alpha.2 (2015-02-20)
4610 =====================================
4612 * ~1300 changes, numerous bugfixes
4616 * The various I/O modules were [overhauled][io-rfc] to reduce
4617 unnecessary abstractions and provide better interoperation with
4618 the underlying platform. The old `io` module remains temporarily
4620 * The standard library now [participates in feature gating][feat],
4621 so use of unstable libraries now requires a `#![feature(...)]`
4622 attribute. The impact of this change is [described on the
4623 forum][feat-forum]. [RFC][feat-rfc].
4627 * `for` loops [now operate on the `IntoIterator` trait][into],
4628 which eliminates the need to call `.iter()`, etc. to iterate
4629 over collections. There are some new subtleties to remember
4630 though regarding what sort of iterators various types yield, in
4631 particular that `for foo in bar { }` yields values from a move
4632 iterator, destroying the original collection. [RFC][into-rfc].
4633 * Objects now have [default lifetime bounds][obj], so you don't
4634 have to write `Box<Trait+'static>` when you don't care about
4635 storing references. [RFC][obj-rfc].
4636 * In types that implement `Drop`, [lifetimes must outlive the
4637 value][drop]. This will soon make it possible to safely
4638 implement `Drop` for types where `#[unsafe_destructor]` is now
4639 required. Read the [gorgeous RFC][drop-rfc] for details.
4640 * The fully qualified <T as Trait>::X syntax lets you set the Self
4641 type for a trait method or associated type. [RFC][ufcs-rfc].
4642 * References to types that implement `Deref<U>` now [automatically
4643 coerce to references][deref] to the dereferenced type `U`,
4644 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
4645 should eliminate many unsightly uses of `&*`, as when converting
4646 from references to vectors into references to
4647 slices. [RFC][deref-rfc].
4648 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
4649 `|:|`) is obsolete and closure kind is inferred from context.
4650 * [`Self` is a keyword][Self].
4654 * The `Show` and `String` formatting traits [have been
4655 renamed][fmt] to `Debug` and `Display` to more clearly reflect
4656 their related purposes. Automatically getting a string
4657 conversion to use with `format!("{:?}", something_to_debug)` is
4658 now written `#[derive(Debug)]`.
4659 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
4660 OsStr}`, provide strings in platform-specific encodings for easier
4661 interop with system APIs. [RFC][osstr-rfc].
4662 * The `boxed::into_raw` and `Box::from_raw` functions [convert
4663 between `Box<T>` and `*mut T`][boxraw], a common pattern for
4664 creating raw pointers.
4668 * Certain long error messages of the form 'expected foo found bar'
4669 are now [split neatly across multiple
4670 lines][multiline]. Examples in the PR.
4671 * On Unix Rust can be [uninstalled][un] by running
4672 `/usr/local/lib/rustlib/uninstall.sh`.
4673 * The `#[rustc_on_unimplemented]` attribute, requiring the
4674 'on_unimplemented' feature, lets rustc [display custom error
4675 messages when a trait is expected to be implemented for a type
4680 * Rust is tested against a [LALR grammar][lalr], which parses
4681 almost all the Rust files that rustc does.
4683 [boxraw]: https://github.com/rust-lang/rust/pull/21318
4684 [close]: https://github.com/rust-lang/rust/pull/21843
4685 [deref]: https://github.com/rust-lang/rust/pull/21351
4686 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
4687 [drop]: https://github.com/rust-lang/rust/pull/21972
4688 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4689 [feat]: https://github.com/rust-lang/rust/pull/21248
4690 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
4691 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
4692 [fmt]: https://github.com/rust-lang/rust/pull/21457
4693 [into]: https://github.com/rust-lang/rust/pull/20790
4694 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
4695 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4696 [lalr]: https://github.com/rust-lang/rust/pull/21452
4697 [multiline]: https://github.com/rust-lang/rust/pull/19870
4698 [obj]: https://github.com/rust-lang/rust/pull/22230
4699 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
4700 [onun]: https://github.com/rust-lang/rust/pull/20889
4701 [osstr]: https://github.com/rust-lang/rust/pull/21488
4702 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4703 [Self]: https://github.com/rust-lang/rust/pull/22158
4704 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
4705 [un]: https://github.com/rust-lang/rust/pull/22256
4708 Version 1.0.0-alpha (2015-01-09)
4709 ==================================
4711 * ~2400 changes, numerous bugfixes
4715 * The language itself is considered feature complete for 1.0,
4716 though there will be many usability improvements and bugfixes
4717 before the final release.
4718 * Nearly 50% of the public API surface of the standard library has
4719 been declared 'stable'. Those interfaces are unlikely to change
4721 * The long-running debate over integer types has been
4722 [settled][ints]: Rust will ship with types named `isize` and
4723 `usize`, rather than `int` and `uint`, for pointer-sized
4724 integers. Guidelines will be rolled out during the alpha cycle.
4725 * Most crates that are not `std` have been moved out of the Rust
4726 distribution into the Cargo ecosystem so they can evolve
4727 separately and don't need to be stabilized as quickly, including
4728 'time', 'getopts', 'num', 'regex', and 'term'.
4729 * Documentation continues to be expanded with more API coverage, more
4730 examples, and more in-depth explanations. The guides have been
4731 consolidated into [The Rust Programming Language][trpl].
4732 * "[Rust By Example][rbe]" is now maintained by the Rust team.
4733 * All official Rust binary installers now come with [Cargo], the
4734 Rust package manager.
4738 * Closures have been [completely redesigned][unboxed] to be
4739 implemented in terms of traits, can now be used as generic type
4740 bounds and thus monomorphized and inlined, or via an opaque
4741 pointer (boxed) as in the old system. The new system is often
4742 referred to as 'unboxed' closures.
4743 * Traits now support [associated types][assoc], allowing families
4744 of related types to be defined together and used generically in
4746 * Enum variants are [namespaced by their type names][enum].
4747 * [`where` clauses][where] provide a more versatile and attractive
4748 syntax for specifying generic bounds, though the previous syntax
4750 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
4752 * Rust [no longer has a runtime][rt] of any description, and only
4753 supports OS threads, not green threads.
4754 * At long last, Rust has been overhauled for 'dynamically-sized
4755 types' ([DST]), which integrates 'fat pointers' (object types,
4756 arrays, and `str`) more deeply into the type system, making it
4758 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
4759 `..j` that produce range types and which, when combined with the
4760 `Index` operator and multidispatch, leads to a convenient slice
4762 * The new range syntax revealed an ambiguity in the fixed-length
4763 array syntax, so now fixed length arrays [are written `[T;
4765 * The `Copy` trait is no longer implemented automatically. Unsafe
4766 pointers no longer implement `Sync` and `Send` so types
4767 containing them don't automatically either. `Sync` and `Send`
4768 are now 'unsafe traits' so one can "forcibly" implement them via
4769 `unsafe impl` if a type confirms to the requirements for them
4770 even though the internals do not (e.g. structs containing unsafe
4771 pointers like `Arc`). These changes are intended to prevent some
4772 footguns and are collectively known as [opt-in built-in
4773 traits][oibit] (though `Sync` and `Send` will soon become pure
4774 library types unknown to the compiler).
4775 * Operator traits now take their operands [by value][ops], and
4776 comparison traits can use multidispatch to compare one type
4777 against multiple other types, allowing e.g. `String` to be
4778 compared with `&str`.
4779 * `if let` and `while let` are no longer feature-gated.
4780 * Rust has adopted a more [uniform syntax for escaping unicode
4781 characters][unicode].
4782 * `macro_rules!` [has been declared stable][mac]. Though it is a
4783 flawed system it is sufficiently popular that it must be usable
4784 for 1.0. Effort has gone into [future-proofing][mac-future] it
4785 in ways that will allow other macro systems to be developed in
4786 parallel, and won't otherwise impact the evolution of the
4788 * The prelude has been [pared back significantly][prelude] such
4789 that it is the minimum necessary to support the most pervasive
4790 code patterns, and through [generalized where clauses][where]
4791 many of the prelude extension traits have been consolidated.
4792 * Rust's rudimentary reflection [has been removed][refl], as it
4793 incurred too much code generation for little benefit.
4794 * [Struct variants][structvars] are no longer feature-gated.
4795 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
4796 known as 'higher-ranked trait bounds', this crucially allows
4797 unboxed closures to work.
4798 * Macros invocations surrounded by parens or square brackets and
4799 not terminated by a semicolon are [parsed as
4800 expressions][macros], which makes expressions like `vec![1i32,
4801 2, 3].len()` work as expected.
4802 * Trait objects now implement their traits automatically, and
4803 traits that can be coerced to objects now must be [object
4805 * Automatically deriving traits is now done with `#[derive(...)]`
4806 not `#[deriving(...)]` for [consistency with other naming
4807 conventions][derive].
4808 * Importing the containing module or enum at the same time as
4809 items or variants they contain is [now done with `self` instead
4810 of `mod`][self], as in use `foo::{self, bar}`
4811 * Glob imports are no longer feature-gated.
4812 * The `box` operator and `box` patterns have been feature-gated
4813 pending a redesign. For now unique boxes should be allocated
4814 like other containers, with `Box::new`.
4818 * A [series][coll1] of [efforts][coll2] to establish
4819 [conventions][coll3] for collections types has resulted in API
4820 improvements throughout the standard library.
4821 * New [APIs for error handling][err] provide ergonomic interop
4822 between error types, and [new conventions][err-conv] describe
4823 more clearly the recommended error handling strategies in Rust.
4824 * The `fail!` macro has been renamed to [`panic!`][panic] so that
4825 it is easier to discuss failure in the context of error handling
4826 without making clarifications as to whether you are referring to
4827 the 'fail' macro or failure more generally.
4828 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
4829 syscall when available.
4830 * The 'serialize' crate has been renamed 'rustc-serialize' and
4831 moved out of the distribution to Cargo. Although it is widely
4832 used now, it is expected to be superseded in the near future.
4833 * The `Show` formatter, typically implemented with
4834 `#[derive(Show)]` is [now requested with the `{:?}`
4835 specifier][show] and is intended for use by all types, for uses
4836 such as `println!` debugging. The new `String` formatter must be
4837 implemented by hand, uses the `{}` specifier, and is intended
4838 for full-fidelity conversions of things that can logically be
4839 represented as strings.
4843 * [Flexible target specification][flex] allows rustc's code
4844 generation to be configured to support otherwise-unsupported
4846 * Rust comes with rust-gdb and rust-lldb scripts that launch their
4847 respective debuggers with Rust-appropriate pretty-printing.
4848 * The Windows installation of Rust is distributed with the
4849 MinGW components currently required to link binaries on that
4854 * Nullable enum optimizations have been extended to more types so
4855 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
4856 space than the inner types themselves.
4857 * Work has begun on supporting AArch64.
4859 [Cargo]: https://crates.io
4860 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
4861 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
4862 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
4863 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
4864 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
4865 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
4866 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
4867 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
4868 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
4869 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
4870 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
4871 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
4872 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
4873 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
4874 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
4875 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
4876 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
4877 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
4878 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
4879 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
4880 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
4881 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
4882 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
4883 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
4884 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
4885 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
4886 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
4887 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
4888 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
4889 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
4890 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
4891 [trpl]: https://doc.rust-lang.org/book/index.html
4892 [rbe]: http://rustbyexample.com/
4895 Version 0.12.0 (2014-10-09)
4896 =============================
4898 * ~1900 changes, numerous bugfixes
4902 * The introductory documentation (now called The Rust Guide) has
4903 been completely rewritten, as have a number of supplementary
4905 * Rust's package manager, Cargo, continues to improve and is
4906 sometimes considered to be quite awesome.
4907 * Many API's in `std` have been reviewed and updated for
4908 consistency with the in-development Rust coding
4909 guidelines. The standard library documentation tracks
4910 stabilization progress.
4911 * Minor libraries have been moved out-of-tree to the rust-lang org
4912 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
4913 be installed with Cargo.
4914 * Lifetime elision allows lifetime annotations to be left off of
4915 function declarations in many common scenarios.
4916 * Rust now works on 64-bit Windows.
4919 * Indexing can be overloaded with the `Index` and `IndexMut`
4921 * The `if let` construct takes a branch only if the `let` pattern
4922 matches, currently behind the 'if_let' feature gate.
4923 * 'where clauses', a more flexible syntax for specifying trait
4924 bounds that is more aesthetic, have been added for traits and
4925 free functions. Where clauses will in the future make it
4926 possible to constrain associated types, which would be
4927 impossible with the existing syntax.
4928 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
4929 the 'slicing_syntax' feature gate, and can be overloaded with
4930 the `Slice` or `SliceMut` traits.
4931 * The syntax for matching of sub-slices has been changed to use a
4932 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
4933 consistency with other uses of `..` and to future-proof
4934 potential additional uses of the syntax.
4935 * The syntax for matching inclusive ranges in patterns has changed
4936 from `0..3` to `0...4` to be consistent with the exclusive range
4938 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
4939 c]`) has been put behind the 'advanced_slice_patterns' feature
4940 gate and may be removed in the future.
4941 * Components of tuples and tuple structs can be extracted using
4942 the `value.0` syntax, currently behind the `tuple_indexing`
4944 * The `#[crate_id]` attribute is no longer supported; versioning
4945 is handled by the package manager.
4946 * Renaming crate imports are now written `extern crate foo as bar`
4947 instead of `extern crate bar = foo`.
4948 * Renaming use statements are now written `use foo as bar` instead
4950 * `let` and `match` bindings and argument names in macros are now
4952 * The new, more efficient, closure types ('unboxed closures') have
4953 been added under a feature gate, 'unboxed_closures'. These will
4954 soon replace the existing closure types, once higher-ranked
4955 trait lifetimes are added to the language.
4956 * `move` has been added as a keyword, for indicating closures
4957 that capture by value.
4958 * Mutation and assignment is no longer allowed in pattern guards.
4959 * Generic structs and enums can now have trait bounds.
4960 * The `Share` trait is now called `Sync` to free up the term
4961 'shared' to refer to 'shared reference' (the default reference
4963 * Dynamically-sized types have been mostly implemented,
4964 unifying the behavior of fat-pointer types with the rest of the
4966 * As part of dynamically-sized types, the `Sized` trait has been
4967 introduced, which qualifying types implement by default, and
4968 which type parameters expect by default. To specify that a type
4969 parameter does not need to be sized, write `<Sized? T>`. Most
4970 types are `Sized`, notable exceptions being unsized arrays
4971 (`[T]`) and trait types.
4972 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
4973 * Lifetime bounds can now be applied to type parameters and object
4975 * The old, reference counted GC type, `Gc<T>` which was once
4976 denoted by the `@` sigil, has finally been removed. GC will be
4977 revisited in the future.
4980 * Library documentation has been improved for a number of modules.
4981 * Bit-vectors, collections::bitv has been modernized.
4982 * The url crate is deprecated in favor of
4983 http://github.com/servo/rust-url, which can be installed with
4985 * Most I/O stream types can be cloned and subsequently closed from
4987 * A `std::time::Duration` type has been added for use in I/O
4988 methods that rely on timers, as well as in the 'time' crate's
4989 `Timespec` arithmetic.
4990 * The runtime I/O abstraction layer that enabled the green thread
4991 scheduler to do non-thread-blocking I/O has been removed, along
4992 with the libuv-based implementation employed by the green thread
4993 scheduler. This will greatly simplify the future I/O work.
4994 * `collections::btree` has been rewritten to have a more
4995 idiomatic and efficient design.
4998 * rustdoc output now indicates the stability levels of API's.
4999 * The `--crate-name` flag can specify the name of the crate
5000 being compiled, like `#[crate_name]`.
5001 * The `-C metadata` specifies additional metadata to hash into
5002 symbol names, and `-C extra-filename` specifies additional
5003 information to put into the output filename, for use by the
5004 package manager for versioning.
5005 * debug info generation has continued to improve and should be
5006 more reliable under both gdb and lldb.
5007 * rustc has experimental support for compiling in parallel
5008 using the `-C codegen-units` flag.
5009 * rustc no longer encodes rpath information into binaries by
5013 * Stack usage has been optimized with LLVM lifetime annotations.
5014 * Official Rust binaries on Linux are more compatible with older
5015 kernels and distributions, built on CentOS 5.10.
5018 Version 0.11.0 (2014-07-02)
5019 ==========================
5021 * ~1700 changes, numerous bugfixes
5024 * ~[T] has been removed from the language. This type is superseded by
5026 * ~str has been removed from the language. This type is superseded by
5028 * ~T has been removed from the language. This type is superseded by the
5030 * @T has been removed from the language. This type is superseded by the
5031 standard library's std::gc::Gc<T> type.
5032 * Struct fields are now all private by default.
5033 * Vector indices and shift amounts are both required to be a `uint`
5034 instead of any integral type.
5035 * Byte character, byte string, and raw byte string literals are now all
5036 supported by prefixing the normal literal with a `b`.
5037 * Multiple ABIs are no longer allowed in an ABI string
5038 * The syntax for lifetimes on closures/procedures has been tweaked
5039 slightly: `<'a>|A, B|: 'b + K -> T`
5040 * Floating point modulus has been removed from the language; however it
5041 is still provided by a library implementation.
5042 * Private enum variants are now disallowed.
5043 * The `priv` keyword has been removed from the language.
5044 * A closure can no longer be invoked through a &-pointer.
5045 * The `use foo, bar, baz;` syntax has been removed from the language.
5046 * The transmute intrinsic no longer works on type parameters.
5047 * Statics now allow blocks/items in their definition.
5048 * Trait bounds are separated from objects with + instead of : now.
5049 * Objects can no longer be read while they are mutably borrowed.
5050 * The address of a static is now marked as insignificant unless the
5051 #[inline(never)] attribute is placed it.
5052 * The #[unsafe_destructor] attribute is now behind a feature gate.
5053 * Struct literals are no longer allowed in ambiguous positions such as
5054 if, while, match, and for..in.
5055 * Declaration of lang items and intrinsics are now feature-gated by
5057 * Integral literals no longer default to `int`, and floating point
5058 literals no longer default to `f64`. Literals must be suffixed with an
5059 appropriate type if inference cannot determine the type of the
5061 * The Box<T> type is no longer implicitly borrowed to &mut T.
5062 * Procedures are now required to not capture borrowed references.
5065 * The standard library is now a "facade" over a number of underlying
5066 libraries. This means that development on the standard library should
5067 be speedier due to smaller crates, as well as a clearer line between
5069 * A new library, libcore, lives under the standard library's facade
5070 which is Rust's "0-assumption" library, suitable for embedded and
5071 kernel development for example.
5072 * A regex crate has been added to the standard distribution. This crate
5073 includes statically compiled regular expressions.
5074 * The unwrap/unwrap_err methods on Result require a Show bound for
5075 better error messages.
5076 * The return types of the std::comm primitives have been centralized
5077 around the Result type.
5078 * A number of I/O primitives have gained the ability to time out their
5080 * A number of I/O primitives have gained the ability to close their
5081 reading/writing halves to cancel pending operations.
5082 * Reverse iterator methods have been removed in favor of `rev()` on
5083 their forward-iteration counterparts.
5084 * A bitflags! macro has been added to enable easy interop with C and
5085 management of bit flags.
5086 * A debug_assert! macro is now provided which is disabled when
5087 `--cfg ndebug` is passed to the compiler.
5088 * A graphviz crate has been added for creating .dot files.
5089 * The std::cast module has been migrated into std::mem.
5090 * The std::local_data api has been migrated from freestanding functions
5091 to being based on methods.
5092 * The Pod trait has been renamed to Copy.
5093 * jemalloc has been added as the default allocator for types.
5094 * The API for allocating memory has been changed to use proper alignment
5095 and sized deallocation
5096 * Connecting a TcpStream or binding a TcpListener is now based on a
5097 string address and a u16 port. This allows connecting to a hostname as
5099 * The Reader trait now contains a core method, read_at_least(), which
5100 correctly handles many repeated 0-length reads.
5101 * The process-spawning API is now centered around a builder-style
5103 * The :? printing qualifier has been moved from the standard library to
5104 an external libdebug crate.
5105 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
5106 have been renamed to Eq/Ord.
5107 * The select/plural methods have been removed from format!. The escapes
5108 for { and } have also changed from \{ and \} to {{ and }},
5110 * The TaskBuilder API has been re-worked to be a true builder, and
5111 extension traits for spawning native/green tasks have been added.
5114 * All breaking changes to the language or libraries now have their
5115 commit message annotated with `[breaking-change]` to allow for easy
5116 discovery of breaking changes.
5117 * The compiler will now try to suggest how to annotate lifetimes if a
5118 lifetime-related error occurs.
5119 * Debug info continues to be improved greatly with general bug fixes and
5120 better support for situations like link time optimization (LTO).
5121 * Usage of syntax extensions when cross-compiling has been fixed.
5122 * Functionality equivalent to GCC & Clang's -ffunction-sections,
5123 -fdata-sections and --gc-sections has been enabled by default
5124 * The compiler is now stricter about where it will load module files
5125 from when a module is declared via `mod foo;`.
5126 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
5127 Syntax extensions are now discovered via a "plugin registrar" type
5128 which will be extended in the future to other various plugins.
5129 * Lints have been restructured to allow for dynamically loadable lints.
5130 * A number of rustdoc improvements:
5131 * The HTML output has been visually redesigned.
5132 * Markdown is now powered by hoedown instead of sundown.
5133 * Searching heuristics have been greatly improved.
5134 * The search index has been reduced in size by a great amount.
5135 * Cross-crate documentation via `pub use` has been greatly improved.
5136 * Primitive types are now hyperlinked and documented.
5137 * Documentation has been moved from static.rust-lang.org/doc to
5139 * A new sandbox, play.rust-lang.org, is available for running and
5140 sharing rust code examples on-line.
5141 * Unused attributes are now more robustly warned about.
5142 * The dead_code lint now warns about unused struct fields.
5143 * Cross-compiling to iOS is now supported.
5144 * Cross-compiling to mipsel is now supported.
5145 * Stability attributes are now inherited by default and no longer apply
5146 to intra-crate usage, only inter-crate usage.
5147 * Error message related to non-exhaustive match expressions have been
5151 Version 0.10 (2014-04-03)
5152 =========================
5154 * ~1500 changes, numerous bugfixes
5157 * A new RFC process is now in place for modifying the language.
5158 * Patterns with `@`-pointers have been removed from the language.
5159 * Patterns with unique vectors (`~[T]`) have been removed from the
5161 * Patterns with unique strings (`~str`) have been removed from the
5163 * `@str` has been removed from the language.
5164 * `@[T]` has been removed from the language.
5165 * `@self` has been removed from the language.
5166 * `@Trait` has been removed from the language.
5167 * Headers on `~` allocations which contain `@` boxes inside the type for
5168 reference counting have been removed.
5169 * The semantics around the lifetimes of temporary expressions have changed,
5170 see #3511 and #11585 for more information.
5171 * Cross-crate syntax extensions are now possible, but feature gated. See
5172 #11151 for more information. This includes both `macro_rules!` macros as
5173 well as syntax extensions such as `format!`.
5174 * New lint modes have been added, and older ones have been turned on to be
5176 * Unnecessary parentheses
5179 * Uppercase variables
5180 * Publicly visible private types
5181 * `#[deriving]` with raw pointers
5182 * Unsafe functions can no longer be coerced to closures.
5183 * Various obscure macros such as `log_syntax!` are now behind feature gates.
5184 * The `#[simd]` attribute is now behind a feature gate.
5185 * Visibility is no longer allowed on `extern crate` statements, and
5186 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
5187 * Trailing commas are now allowed in argument lists and tuple patterns.
5188 * The `do` keyword has been removed, it is now a reserved keyword.
5189 * Default type parameters have been implemented, but are feature gated.
5190 * Borrowed variables through captures in closures are now considered soundly.
5191 * `extern mod` is now `extern crate`
5192 * The `Freeze` trait has been removed.
5193 * The `Share` trait has been added for types that can be shared among
5195 * Labels in macros are now hygienic.
5196 * Expression/statement macro invocations can be delimited with `{}` now.
5197 * Treatment of types allowed in `static mut` locations has been tweaked.
5198 * The `*` and `.` operators are now overloadable through the `Deref` and
5200 * `~Trait` and `proc` no longer have `Send` bounds by default.
5201 * Partial type hints are now supported with the `_` type marker.
5202 * An `Unsafe` type was introduced for interior mutability. It is now
5203 considered undefined to transmute from `&T` to `&mut T` without using the
5205 * The #[linkage] attribute was implemented for extern statics/functions.
5206 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
5207 * `Pod` was renamed to `Copy`.
5210 * The `libextra` library has been removed. It has now been decomposed into
5211 component libraries with smaller and more focused nuggets of
5212 functionality. The full list of libraries can be found on the
5213 documentation index page.
5214 * std: `std::condition` has been removed. All I/O errors are now propagated
5215 through the `Result` type. In order to assist with error handling, a
5216 `try!` macro for unwrapping errors with an early return and a lint for
5217 unused results has been added. See #12039 for more information.
5218 * std: The `vec` module has been renamed to `slice`.
5219 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
5220 This will become the only growable vector in the future.
5221 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
5222 are now found at `std::io::BufferedReader` instead of
5223 `std::io::buffered::BufferedReader`.
5224 * std: `print` and `println` are no longer in the prelude, the `print!` and
5225 `println!` macros are intended to be used instead.
5226 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
5227 attempts to statically prevent cycles.
5228 * std: The standard distribution is adopting the policy of pushing failure
5229 to the user rather than failing in libraries. Many functions (such as
5230 `slice::last()`) now return `Option<T>` instead of `T` + failing.
5231 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
5232 deriving mode: `#[deriving(Show)]`.
5233 * std: `ToStr` is now implemented for all types implementing `Show`.
5234 * std: The formatting trait methods now take `&self` instead of `&T`
5235 * std: The `invert()` method on iterators has been renamed to `rev()`
5236 * std: `std::num` has seen a reduction in the genericity of its traits,
5237 consolidating functionality into a few core traits.
5238 * std: Backtraces are now printed on task failure if the environment
5239 variable `RUST_BACKTRACE` is present.
5240 * std: Naming conventions for iterators have been standardized. More details
5241 can be found on the wiki's style guide.
5242 * std: `eof()` has been removed from the `Reader` trait. Specific types may
5243 still implement the function.
5244 * std: Networking types are now cloneable to allow simultaneous reads/writes.
5245 * std: `assert_approx_eq!` has been removed
5246 * std: The `e` and `E` formatting specifiers for floats have been added to
5247 print them in exponential notation.
5248 * std: The `Times` trait has been removed
5249 * std: Indications of variance and opting out of builtin bounds is done
5250 through marker types in `std::kinds::marker` now
5251 * std: `hash` has been rewritten, `IterBytes` has been removed, and
5252 `#[deriving(Hash)]` is now possible.
5253 * std: `SharedChan` has been removed, `Sender` is now cloneable.
5254 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
5255 * std: `Chan::new` is now `channel()`.
5256 * std: A new synchronous channel type has been implemented.
5257 * std: A `select!` macro is now provided for selecting over `Receiver`s.
5258 * std: `hashmap` and `trie` have been moved to `libcollections`
5259 * std: `run` has been rolled into `io::process`
5260 * std: `assert_eq!` now uses `{}` instead of `{:?}`
5261 * std: The equality and comparison traits have seen some reorganization.
5262 * std: `rand` has moved to `librand`.
5263 * std: `to_{lower,upper}case` has been implemented for `char`.
5264 * std: Logging has been moved to `liblog`.
5265 * collections: `HashMap` has been rewritten for higher performance and less
5267 * native: The default runtime is now `libnative`. If `libgreen` is desired,
5268 it can be booted manually. The runtime guide has more information and
5270 * native: All I/O functionality except signals has been implemented.
5271 * green: Task spawning with `libgreen` has been optimized with stack caching
5272 and various trimming of code.
5273 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
5274 * sync: The `extra::sync` module has been updated to modern rust (and moved
5275 to the `sync` library), tweaking and improving various interfaces while
5276 dropping redundant functionality.
5277 * sync: A new `Barrier` type has been added to the `sync` library.
5278 * sync: An efficient mutex for native and green tasks has been implemented.
5279 * serialize: The `base64` module has seen some improvement. It treats
5280 newlines better, has non-string error values, and has seen general
5282 * fourcc: A `fourcc!` macro was introduced
5283 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
5284 hexadecimal literal.
5287 * `rustpkg` has been deprecated and removed from the main repository. Its
5288 replacement, `cargo`, is under development.
5289 * Nightly builds of rust are now available
5290 * The memory usage of rustc has been improved many times throughout this
5292 * The build process supports disabling rpath support for the rustc binary
5294 * Code generation has improved in some cases, giving more information to the
5295 LLVM optimization passes to enable more extensive optimizations.
5296 * Debuginfo compatibility with lldb on OSX has been restored.
5297 * The master branch is now gated on an android bot, making building for
5298 android much more reliable.
5299 * Output flags have been centralized into one `--emit` flag.
5300 * Crate type flags have been centralized into one `--crate-type` flag.
5301 * Codegen flags have been consolidated behind a `-C` flag.
5302 * Linking against outdated crates now has improved error messages.
5303 * Error messages with lifetimes will often suggest how to annotate the
5304 function to fix the error.
5305 * Many more types are documented in the standard library, and new guides
5307 * Many `rustdoc` improvements:
5308 * code blocks are syntax highlighted.
5309 * render standalone markdown files.
5310 * the --test flag tests all code blocks by default.
5311 * exported macros are displayed.
5312 * re-exported types have their documentation inlined at the location of the
5314 * search works across crates that have been rendered to the same output
5318 Version 0.9 (2014-01-09)
5319 ==========================
5321 * ~1800 changes, numerous bugfixes
5324 * The `float` type has been removed. Use `f32` or `f64` instead.
5325 * A new facility for enabling experimental features (feature gating) has
5326 been added, using the crate-level `#[feature(foo)]` attribute.
5327 * Managed boxes (@) are now behind a feature gate
5328 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
5329 standard library's `Gc` or `Rc` types instead.
5330 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
5331 * Jumping back to the top of a loop is now done with `continue` instead of
5333 * Strings can no longer be mutated through index assignment.
5334 * Raw strings can be created via the basic `r"foo"` syntax or with matched
5335 hash delimiters, as in `r###"foo"###`.
5336 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
5338 * The `&fn` type is now written `|args| -> ret` to match the literal form.
5339 * `@fn`s have been removed.
5340 * `do` only works with procs in order to make it obvious what the cost
5342 * Single-element tuple-like structs can no longer be dereferenced to
5343 obtain the inner value. A more comprehensive solution for overloading
5344 the dereference operator will be provided in the future.
5345 * The `#[link(...)]` attribute has been replaced with
5346 `#[crate_id = "name#vers"]`.
5347 * Empty `impl`s must be terminated with empty braces and may not be
5348 terminated with a semicolon.
5349 * Keywords are no longer allowed as lifetime names; the `self` lifetime
5350 no longer has any special meaning.
5351 * The old `fmt!` string formatting macro has been removed.
5352 * `printf!` and `printfln!` (old-style formatting) removed in favor of
5353 `print!` and `println!`.
5354 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
5355 * The `extern mod foo (name = "bar")` syntax has been removed. Use
5356 `extern mod foo = "bar"` instead.
5357 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
5358 * Macros can have attributes.
5359 * Macros can expand to items with attributes.
5360 * Macros can expand to multiple items.
5361 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
5362 * Comments may be nested.
5363 * Values automatically coerce to trait objects they implement, without
5365 * Enum discriminants are no longer an entire word but as small as needed to
5366 contain all the variants. The `repr` attribute can be used to override
5367 the discriminant size, as in `#[repr(int)]` for integer-sized, and
5368 `#[repr(C)]` to match C enums.
5369 * Non-string literals are not allowed in attributes (they never worked).
5370 * The FFI now supports variadic functions.
5371 * Octal numeric literals, as in `0o7777`.
5372 * The `concat!` syntax extension performs compile-time string concatenation.
5373 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
5374 removed as Rust no longer uses segmented stacks.
5375 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
5376 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
5377 not `*`; ignoring remaining fields of a struct is also done with `..`,
5378 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
5379 * `rustc` supports the "win64" calling convention via `extern "win64"`.
5380 * `rustc` supports the "system" calling convention, which defaults to the
5381 preferred convention for the target platform, "stdcall" on 32-bit Windows,
5383 * The `type_overflow` lint (default: warn) checks literals for overflow.
5384 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
5385 * The `attribute_usage` lint (default: warn) warns about unknown
5387 * The `unknown_features` lint (default: warn) warns about unknown
5389 * The `dead_code` lint (default: warn) checks for dead code.
5390 * Rust libraries can be linked statically to one another
5391 * `#[link_args]` is behind the `link_args` feature gate.
5392 * Native libraries are now linked with `#[link(name = "foo")]`
5393 * Native libraries can be statically linked to a rust crate
5394 (`#[link(name = "foo", kind = "static")]`).
5395 * Native OS X frameworks are now officially supported
5396 (`#[link(name = "foo", kind = "framework")]`).
5397 * The `#[thread_local]` attribute creates thread-local (not task-local)
5398 variables. Currently behind the `thread_local` feature gate.
5399 * The `return` keyword may be used in closures.
5400 * Types that can be copied via a memcpy implement the `Pod` kind.
5401 * The `cfg` attribute can now be used on struct fields and enum variants.
5404 * std: The `option` and `result` API's have been overhauled to make them
5405 simpler, more consistent, and more composable.
5406 * std: The entire `std::io` module has been replaced with one that is
5407 more comprehensive and that properly interfaces with the underlying
5408 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
5410 * std: `io::util` contains a number of useful implementations of
5411 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
5412 `ZeroReader`, `TeeReader`.
5413 * std: The reference counted pointer type `extra::rc` moved into std.
5414 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
5415 just a wrapper around it).
5416 * std: The `Either` type has been removed.
5417 * std: `fmt::Default` can be implemented for any type to provide default
5418 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
5419 * std: The `rand` API continues to be tweaked.
5420 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
5421 on failure in gdb, is now named `rust_fail`.
5422 * std: The `each_key` and `each_value` methods on `HashMap` have been
5423 replaced by the `keys` and `values` iterators.
5424 * std: Functions dealing with type size and alignment have moved from the
5425 `sys` module to the `mem` module.
5426 * std: The `path` module was written and API changed.
5427 * std: `str::from_utf8` has been changed to cast instead of allocate.
5428 * std: `starts_with` and `ends_with` methods added to vectors via the
5429 `ImmutableEqVector` trait, which is in the prelude.
5430 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
5431 if the index is out of bounds.
5432 * std: Task failure no longer propagates between tasks, as the model was
5433 complex, expensive, and incompatible with thread-based tasks.
5434 * std: The `Any` type can be used for dynamic typing.
5435 * std: `~Any` can be passed to the `fail!` macro and retrieved via
5437 * std: Methods that produce iterators generally do not have an `_iter`
5439 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
5440 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
5441 * std: `util::ignore` renamed to `prelude::drop`.
5442 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
5444 * std: `vec::raw` has seen a lot of cleanup and API changes.
5445 * std: The standard library no longer includes any C++ code, and very
5446 minimal C, eliminating the dependency on libstdc++.
5447 * std: Runtime scheduling and I/O functionality has been factored out into
5448 extensible interfaces and is now implemented by two different crates:
5449 libnative, for native threading and I/O; and libgreen, for green threading
5450 and I/O. This paves the way for using the standard library in more limited
5451 embedded environments.
5452 * std: The `comm` module has been rewritten to be much faster, have a
5453 simpler, more consistent API, and to work for both native and green
5455 * std: All libuv dependencies have been moved into the rustuv crate.
5456 * native: New implementations of runtime scheduling on top of OS threads.
5457 * native: New native implementations of TCP, UDP, file I/O, process spawning,
5459 * green: The green thread scheduler and message passing types are almost
5461 * extra: The `flatpipes` module had bitrotted and was removed.
5462 * extra: All crypto functions have been removed and Rust now has a policy of
5463 not reimplementing crypto in the standard library. In the future crypto
5464 will be provided by external crates with bindings to established libraries.
5465 * extra: `c_vec` has been modernized.
5466 * extra: The `sort` module has been removed. Use the `sort` method on
5470 * The `rust` and `rusti` commands have been removed, due to lack of
5472 * `rustdoc` was completely rewritten.
5473 * `rustdoc` can test code examples in documentation.
5474 * `rustpkg` can test packages with the argument, 'test'.
5475 * `rustpkg` supports arbitrary dependencies, including C libraries.
5476 * `rustc`'s support for generating debug info is improved again.
5477 * `rustc` has better error reporting for unbalanced delimiters.
5478 * `rustc`'s JIT support was removed due to bitrot.
5479 * Executables and static libraries can be built with LTO (-Z lto)
5480 * `rustc` adds a `--dep-info` flag for communicating dependencies to
5484 Version 0.8 (2013-09-26)
5485 ============================
5487 * ~2200 changes, numerous bugfixes
5490 * The `for` loop syntax has changed to work with the `Iterator` trait.
5491 * At long last, unwinding works on Windows.
5492 * Default methods are ready for use.
5493 * Many trait inheritance bugs fixed.
5494 * Owned and borrowed trait objects work more reliably.
5495 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
5496 * rustc can omit emission of code for the `debug!` macro if it is passed
5498 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
5499 for foo.rs, then foo/mod.rs, and will generate an error when both are
5501 * Strings no longer contain trailing nulls. The new `std::c_str` module
5502 provides new mechanisms for converting to C strings.
5503 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
5504 * The FFI has been overhauled such that foreign functions are called directly,
5505 instead of through a stack-switching wrapper.
5506 * Calling a foreign function must be done through a Rust function with the
5507 `#[fixed_stack_segment]` attribute.
5508 * The `externfn!` macro can be used to declare both a foreign function and
5509 a `#[fixed_stack_segment]` wrapper at once.
5510 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
5511 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
5512 * `priv` is disallowed everywhere except for struct fields and enum variants.
5513 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
5514 * `ref` bindings in irrefutable patterns work correctly now.
5515 * `char` is now prevented from containing invalid code points.
5516 * Casting to `bool` is no longer allowed.
5517 * `\0` is now accepted as an escape in chars and strings.
5518 * `yield` is a reserved keyword.
5519 * `typeof` is a reserved keyword.
5520 * Crates may be imported by URL with `extern mod foo = "url";`.
5521 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
5522 * Static vectors can be initialized with repeating elements,
5523 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
5524 * Static structs can be initialized with functional record update,
5525 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
5526 * `cfg!` can be used to conditionally execute code based on the crate
5527 configuration, similarly to `#[cfg(...)]`.
5528 * The `unnecessary_qualification` lint detects unneeded module
5529 prefixes (default: allow).
5530 * Arithmetic operations have been implemented on the SIMD types in
5531 `std::unstable::simd`.
5532 * Exchange allocation headers were removed, reducing memory usage.
5533 * `format!` implements a completely new, extensible, and higher-performance
5534 string formatting system. It will replace `fmt!`.
5535 * `print!` and `println!` write formatted strings (using the `format!`
5536 extension) to stdout.
5537 * `write!` and `writeln!` write formatted strings (using the `format!`
5538 extension) to the new Writers in `std::rt::io`.
5539 * The library section in which a function or static is placed may
5540 be specified with `#[link_section = "..."]`.
5541 * The `proto!` syntax extension for defining bounded message protocols
5543 * `macro_rules!` is hygienic for `let` declarations.
5544 * The `#[export_name]` attribute specifies the name of a symbol.
5545 * `unreachable!` can be used to indicate unreachable code, and fails
5549 * std: Transitioned to the new runtime, written in Rust.
5550 * std: Added an experimental I/O library, `rt::io`, based on the new
5552 * std: A new generic `range` function was added to the prelude, replacing
5553 `uint::range` and friends.
5554 * std: `range_rev` no longer exists. Since range is an iterator it can be
5555 reversed with `range(lo, hi).invert()`.
5556 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
5557 renamed to `unwrap_or`.
5558 * std: The `iterator` module was renamed to `iter`.
5559 * std: Integral types now support the `checked_add`, `checked_sub`, and
5560 `checked_mul` operations for detecting overflow.
5561 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
5563 * std: Methods are standardizing on conventions for casting methods:
5564 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
5566 * std: The `CString` type in `c_str` provides new ways to convert to and
5568 * std: `DoubleEndedIterator` can yield elements in two directions.
5569 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
5571 * std: `str::from_bytes` renamed to `str::from_utf8`.
5572 * std: `pop_opt` and `shift_opt` methods added to vectors.
5573 * std: The task-local data interface no longer uses @, and keys are
5574 no longer function pointers.
5575 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
5576 * std: Added `SharedPort` to `comm`.
5577 * std: `Eq` has a default method for `ne`; only `eq` is required
5579 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
5580 is required in implementations.
5581 * std: `is_utf8` performance is improved, impacting many string functions.
5582 * std: `os::MemoryMap` provides cross-platform mmap.
5583 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
5584 are not 'in-bounds' are considered undefined.
5585 * std: Many freestanding functions in `vec` removed in favor of methods.
5586 * std: Many freestanding functions on scalar types removed in favor of
5588 * std: Many options to task builders were removed since they don't make
5589 sense in the new scheduler design.
5590 * std: More containers implement `FromIterator` so can be created by the
5592 * std: More complete atomic types in `unstable::atomics`.
5593 * std: `comm::PortSet` removed.
5594 * std: Mutating methods in the `Set` and `Map` traits have been moved into
5595 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
5596 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
5597 default implementations.
5598 * std: Various `from_str` functions were removed in favor of a generic
5599 `from_str` which is available in the prelude.
5600 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
5601 * extra: `dlist`, the doubly-linked list was modernized.
5602 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
5603 * extra: Added `glob` module, replacing `std::os::glob`.
5604 * extra: `rope` was removed.
5605 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
5606 * extra: `net`, and `timer` were removed. The experimental replacements
5607 are `std::rt::io::net` and `std::rt::io::timer`.
5608 * extra: Iterators implemented for `SmallIntMap`.
5609 * extra: Iterators implemented for `Bitv` and `BitvSet`.
5610 * extra: `SmallIntSet` removed. Use `BitvSet`.
5611 * extra: Performance of JSON parsing greatly improved.
5612 * extra: `semver` updated to SemVer 2.0.0.
5613 * extra: `term` handles more terminals correctly.
5614 * extra: `dbg` module removed.
5615 * extra: `par` module removed.
5616 * extra: `future` was cleaned up, with some method renames.
5617 * extra: Most free functions in `getopts` were converted to methods.
5620 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
5621 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
5622 similarly to gcc's `--march` flag.
5623 * rustc's performance compiling small crates is much better.
5624 * rustpkg has received many improvements.
5625 * rustpkg supports git tags as package IDs.
5626 * rustpkg builds into target-specific directories so it can be used for
5628 * The number of concurrent test tasks is controlled by the environment
5629 variable RUST_TEST_TASKS.
5630 * The test harness can now report metrics for benchmarks.
5631 * All tools have man pages.
5632 * Programs compiled with `--test` now support the `-h` and `--help` flags.
5633 * The runtime uses jemalloc for allocations.
5634 * Segmented stacks are temporarily disabled as part of the transition to
5635 the new runtime. Stack overflows are possible!
5636 * A new documentation backend, rustdoc_ng, is available for use. It is
5637 still invoked through the normal `rustdoc` command.
5640 Version 0.7 (2013-07-03)
5641 =======================
5643 * ~2000 changes, numerous bugfixes
5646 * `impl`s no longer accept a visibility qualifier. Put them on methods
5648 * The borrow checker has been rewritten with flow-sensitivity, fixing
5649 many bugs and inconveniences.
5650 * The `self` parameter no longer implicitly means `&'self self`,
5651 and can be explicitly marked with a lifetime.
5652 * Overloadable compound operators (`+=`, etc.) have been temporarily
5653 removed due to bugs.
5654 * The `for` loop protocol now requires `for`-iterators to return `bool`
5655 so they compose better.
5656 * The `Durable` trait is replaced with the `'static` bounds.
5657 * Trait default methods work more often.
5658 * Structs with the `#[packed]` attribute have byte alignment and
5659 no padding between fields.
5660 * Type parameters bound by `Copy` must now be copied explicitly with
5662 * It is now illegal to move out of a dereferenced unsafe pointer.
5663 * `Option<~T>` is now represented as a nullable pointer.
5664 * `@mut` does dynamic borrow checks correctly.
5665 * The `main` function is only detected at the topmost level of the crate.
5666 The `#[main]` attribute is still valid anywhere.
5667 * Struct fields may no longer be mutable. Use inherited mutability.
5668 * The `#[no_send]` attribute makes a type that would otherwise be
5670 * The `#[no_freeze]` attribute makes a type that would otherwise be
5672 * Unbounded recursion will abort the process after reaching the limit
5673 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
5674 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
5675 are never implicitly copyable.
5676 * `#[static_assert]` makes compile-time assertions about static bools.
5677 * At long last, 'argument modes' no longer exist.
5678 * The rarely used `use mod` statement no longer exists.
5681 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
5683 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
5684 `Rand`, `Zero` and `ToStr` can all be automatically derived with
5686 * The `bytes!` macro returns a vector of bytes for string, u8, char,
5687 and unsuffixed integer literals.
5690 * The `core` crate was renamed to `std`.
5691 * The `std` crate was renamed to `extra`.
5692 * More and improved documentation.
5693 * std: `iterator` module for external iterator objects.
5694 * Many old-style (internal, higher-order function) iterators replaced by
5695 implementations of `Iterator`.
5696 * std: Many old internal vector and string iterators,
5697 incl. `any`, `all`. removed.
5698 * std: The `finalize` method of `Drop` renamed to `drop`.
5699 * std: The `drop` method now takes `&mut self` instead of `&self`.
5700 * std: The prelude no longer re-exports any modules, only types and traits.
5701 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
5702 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
5703 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
5704 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
5705 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
5706 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
5707 * std: Many types implement `Clone`.
5708 * std: `path` type renamed to `Path`.
5709 * std: `mut` module and `Mut` type removed.
5710 * std: Many standalone functions removed in favor of methods and iterators
5711 in `vec`, `str`. In the future methods will also work as functions.
5712 * std: `reinterpret_cast` removed. Use `transmute`.
5713 * std: ascii string handling in `std::ascii`.
5714 * std: `Rand` is implemented for ~/@.
5715 * std: `run` module for spawning processes overhauled.
5716 * std: Various atomic types added to `unstable::atomic`.
5717 * std: Various types implement `Zero`.
5718 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
5719 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
5720 * std: Added `os::mkdir_recursive`.
5721 * std: Added `os::glob` function performs filesystems globs.
5722 * std: `FuzzyEq` renamed to `ApproxEq`.
5723 * std: `Map` now defines `pop` and `swap` methods.
5724 * std: `Cell` constructors converted to static methods.
5725 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
5726 * extra: `flate` module moved from `std` to `extra`.
5727 * extra: `fileinput` module for iterating over a series of files.
5728 * extra: `Complex` number type and `complex` module.
5729 * extra: `Rational` number type and `rational` module.
5730 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
5731 * extra: `term` uses terminfo now, is more correct.
5732 * extra: `arc` functions converted to methods.
5733 * extra: Implementation of fixed output size variations of SHA-2.
5736 * `unused_variable` lint mode for unused variables (default: warn).
5737 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
5739 * `unused_mut` lint mode for identifying unused `mut` qualifiers
5741 * `dead_assignment` lint mode for unread variables (default: warn).
5742 * `unnecessary_allocation` lint mode detects some heap allocations that are
5743 immediately borrowed so could be written without allocating (default: warn).
5744 * `missing_doc` lint mode (default: allow).
5745 * `unreachable_code` lint mode (default: warn).
5746 * The `rusti` command has been rewritten and a number of bugs addressed.
5747 * rustc outputs in color on more terminals.
5748 * rustc accepts a `--link-args` flag to pass arguments to the linker.
5749 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
5750 * Compiling with `-g` will make the binary record information about
5751 dynamic borrowcheck failures for debugging.
5752 * rustdoc has a nicer stylesheet.
5753 * Various improvements to rustdoc.
5754 * Improvements to rustpkg (see the detailed release notes).
5757 Version 0.6 (2013-04-03)
5758 ========================
5760 * ~2100 changes, numerous bugfixes
5763 * The self type parameter in traits is now spelled `Self`
5764 * The `self` parameter in trait and impl methods must now be explicitly
5765 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
5766 * Static methods no longer require the `static` keyword and instead
5767 are distinguished by the lack of a `self` parameter
5768 * Replaced the `Durable` trait with the `'static` lifetime
5769 * The old closure type syntax with the trailing sigil has been
5770 removed in favor of the more consistent leading sigil
5771 * `super` is a keyword, and may be prefixed to paths
5772 * Trait bounds are separated with `+` instead of whitespace
5773 * Traits are implemented with `impl Trait for Type`
5774 instead of `impl Type: Trait`
5775 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
5776 * The `export` keyword has finally been removed
5777 * The `move` keyword has been removed (see "Semantic changes")
5778 * The interior mutability qualifier on vectors, `[mut T]`, has been
5779 removed. Use `&mut [T]`, etc.
5780 * `mut` is no longer valid in `~mut T`. Use inherited mutability
5781 * `fail` is no longer a keyword. Use `fail!()`
5782 * `assert` is no longer a keyword. Use `assert!()`
5783 * `log` is no longer a keyword. use `debug!`, etc.
5784 * 1-tuples may be represented as `(T,)`
5785 * Struct fields may no longer be `mut`. Use inherited mutability,
5786 `@mut T`, `core::mut` or `core::cell`
5787 * `extern mod { ... }` is no longer valid syntax for foreign
5788 function modules. Use extern blocks: `extern { ... }`
5789 * Newtype enums removed. Use tuple-structs.
5790 * Trait implementations no longer support visibility modifiers
5791 * Pattern matching over vectors improved and expanded
5792 * `const` renamed to `static` to correspond to lifetime name,
5793 and make room for future `static mut` unsafe mutable globals.
5794 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
5795 * `Clone` implementations can be automatically generated with
5796 `#[deriving(Clone)]`
5797 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
5798 instead of `foo as Bar`.
5799 * Fixed length vector types are now written as `[int, .. 3]`
5800 instead of `[int * 3]`.
5801 * Fixed length vector types can express the length as a constant
5802 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
5805 * Types with owned pointers or custom destructors move by default,
5806 eliminating the `move` keyword
5807 * All foreign functions are considered unsafe
5808 * &mut is now unaliasable
5809 * Writes to borrowed @mut pointers are prevented dynamically
5811 * The name of the main function can be customized using #[main]
5812 * The default type of an inferred closure is &fn instead of @fn
5813 * `use` statements may no longer be "chained" - they cannot import
5814 identifiers imported by previous `use` statements
5815 * `use` statements are crate relative, importing from the "top"
5816 of the crate by default. Paths may be prefixed with `super::`
5817 or `self::` to change the search behavior.
5818 * Method visibility is inherited from the implementation declaration
5819 * Structural records have been removed
5820 * Many more types can be used in static items, including enums
5821 'static-lifetime pointers and vectors
5822 * Pattern matching over vectors improved and expanded
5823 * Typechecking of closure types has been overhauled to
5824 improve inference and eliminate unsoundness
5825 * Macros leave scope at the end of modules, unless that module is
5826 tagged with #[macro_escape]
5829 * Added big integers to `std::bigint`
5830 * Removed `core::oldcomm` module
5831 * Added pipe-based `core::comm` module
5832 * Numeric traits have been reorganized under `core::num`
5833 * `vec::slice` finally returns a slice
5834 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
5835 * Containers reorganized around traits in `core::container`
5836 * `core::dvec` removed, `~[T]` is a drop-in replacement
5837 * `core::send_map` renamed to `core::hashmap`
5838 * `std::map` removed; replaced with `core::hashmap`
5839 * `std::treemap` reimplemented as an owned balanced tree
5840 * `std::deque` and `std::smallintmap` reimplemented as owned containers
5841 * `core::trie` added as a fast ordered map for integer keys
5842 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
5843 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
5844 overload the comparison operators, whereas `TotalOrd` is used
5845 by certain container types
5848 * Replaced the 'cargo' package manager with 'rustpkg'
5849 * Added all-purpose 'rust' tool
5850 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
5851 * rustc now *attempts* to offer spelling suggestions
5852 * Improved support for ARM and Android
5853 * Preliminary MIPS backend
5854 * Improved foreign function ABI implementation for x86, x86_64
5855 * Various memory usage improvements
5856 * Rust code may be embedded in foreign code under limited circumstances
5857 * Inline assembler supported by new asm!() syntax extension.
5860 Version 0.5 (2012-12-21)
5861 ===========================
5863 * ~900 changes, numerous bugfixes
5866 * Removed `<-` move operator
5867 * Completed the transition from the `#fmt` extension syntax to `fmt!`
5868 * Removed old fixed length vector syntax - `[T]/N`
5869 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
5870 * Macros may now expand to items and statements
5871 * `a.b()` is always parsed as a method call, never as a field projection
5872 * `Eq` and `IterBytes` implementations can be automatically generated
5873 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
5874 * Removed the special crate language for `.rc` files
5875 * Function arguments may consist of any irrefutable pattern
5878 * `&` and `~` pointers may point to objects
5879 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
5880 * Enum variants may be structs
5881 * Destructors can be added to all nominal types with the Drop trait
5882 * Structs and nullary enum variants may be constants
5883 * Values that cannot be implicitly copied are now automatically moved
5884 without writing `move` explicitly
5885 * `&T` may now be coerced to `*T`
5886 * Coercions happen in `let` statements as well as function calls
5887 * `use` statements now take crate-relative paths
5888 * The module and type namespaces have been merged so that static
5889 method names can be resolved under the trait in which they are
5892 * Improved support for language features
5893 * Trait inheritance works in many scenarios
5894 * More support for explicit self arguments in methods - `self`, `&self`
5895 `@self`, and `~self` all generally work as expected
5896 * Static methods work in more situations
5897 * Experimental: Traits may declare default methods for the implementations
5901 * New condition handling system in `core::condition`
5902 * Timsort added to `std::sort`
5903 * New priority queue, `std::priority_queue`
5904 * Pipes for serializable types, `std::flatpipes'
5905 * Serialization overhauled to be trait-based
5906 * Expanded `getopts` definitions
5907 * Moved futures to `std`
5908 * More functions are pure now
5909 * `core::comm` renamed to `oldcomm`. Still deprecated
5910 * `rustdoc` and `cargo` are libraries now
5913 * Added a preliminary REPL, `rusti`
5914 * License changed from MIT to dual MIT/APL2
5917 Version 0.4 (2012-10-15)
5918 ==========================
5920 * ~2000 changes, numerous bugfixes
5923 * All keywords are now strict and may not be used as identifiers anywhere
5924 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
5925 'of', 'with', 'to', 'class'.
5926 * Classes are replaced with simpler structs
5927 * Explicit method self types
5928 * `ret` became `return` and `alt` became `match`
5929 * `import` is now `use`; `use is now `extern mod`
5930 * `extern mod { ... }` is now `extern { ... }`
5931 * `use mod` is the recommended way to import modules
5932 * `pub` and `priv` replace deprecated export lists
5933 * The syntax of `match` pattern arms now uses fat arrow (=>)
5934 * `main` no longer accepts an args vector; use `os::args` instead
5937 * Trait implementations are now coherent, ala Haskell typeclasses
5938 * Trait methods may be static
5939 * Argument modes are deprecated
5940 * Borrowed pointers are much more mature and recommended for use
5941 * Strings and vectors in the static region are stored in constant memory
5942 * Typestate was removed
5943 * Resolution rewritten to be more reliable
5944 * Support for 'dual-mode' data structures (freezing and thawing)
5947 * Most binary operators can now be overloaded via the traits in
5949 * `std::net::url` for representing URLs
5950 * Sendable hash maps in `core::send_map`
5951 * `core::task' gained a (currently unsafe) task-local storage API
5954 * An efficient new intertask communication primitive called the pipe,
5955 along with a number of higher-level channel types, in `core::pipes`
5956 * `std::arc`, an atomically reference counted, immutable, shared memory
5958 * `std::sync`, various exotic synchronization tools based on arcs and pipes
5959 * Futures are now based on pipes and sendable
5960 * More robust linked task failure
5961 * Improved task builder API
5964 * Improved error reporting
5965 * Preliminary JIT support
5966 * Preliminary work on precise GC
5967 * Extensive architectural improvements to rustc
5968 * Begun a transition away from buggy C++-based reflection (shape) code to
5969 Rust-based (visitor) code
5970 * All hash functions and tables converted to secure, randomized SipHash
5973 Version 0.3 (2012-07-12)
5974 ========================
5976 * ~1900 changes, numerous bugfixes
5978 * New coding conveniences
5979 * Integer-literal suffix inference
5980 * Per-item control over warnings, errors
5981 * #[cfg(windows)] and #[cfg(unix)] attributes
5982 * Documentation comments
5983 * More compact closure syntax
5984 * 'do' expressions for treating higher-order functions as
5986 * *-patterns (wildcard extended to all constructor fields)
5989 * Name resolution pass and exhaustiveness checker rewritten
5990 * Region pointers and borrow checking supersede alias
5992 * Init-ness checking is now provided by a region-based liveness
5993 pass instead of the typestate pass; same for last-use analysis
5994 * Extensive work on region pointers
5996 * Experimental new language features
5997 * Slices and fixed-size, interior-allocated vectors
5998 * #!-comments for lang versioning, shell execution
5999 * Destructors and iface implementation for classes;
6000 type-parameterized classes and class methods
6001 * 'const' type kind for types that can be used to implement
6002 shared-memory concurrency patterns
6006 * Removal of various obsolete features
6007 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
6008 'crust', 'native' (now 'extern'), 'cont' (now 'again')
6010 * Constructs: do-while loops ('do' repurposed), fn binding,
6011 resources (replaced by destructors)
6013 * Compiler reorganization
6014 * Syntax-layer of compiler split into separate crate
6015 * Clang (from LLVM project) integrated into build
6016 * Typechecker split into sub-modules
6019 * New time functions
6020 * Extension methods for many built-in types
6021 * Arc: atomic-refcount read-only / exclusive-use shared cells
6022 * Par: parallel map and search routines
6023 * Extensive work on libuv interface
6024 * Much vector code moved to libraries
6025 * Syntax extensions: #line, #col, #file, #mod, #stringify,
6026 #include, #include_str, #include_bin
6029 * Cargo automatically resolves dependencies
6032 Version 0.2 (2012-03-29)
6033 =========================
6035 * >1500 changes, numerous bugfixes
6037 * New docs and doc tooling
6039 * New port: FreeBSD x86_64
6041 * Compilation model enhancements
6042 * Generics now specialized, multiply instantiated
6043 * Functions now inlined across separate crates
6045 * Scheduling, stack and threading fixes
6046 * Noticeably improved message-passing performance
6047 * Explicit schedulers
6051 * Experimental new language features
6052 * Operator overloading
6056 * Various language extensions
6057 * C-callback function types: 'crust fn ...'
6058 * Infinite-loop construct: 'loop { ... }'
6059 * Shorten 'mutable' to 'mut'
6060 * Required mutable-local qualifier: 'let mut ...'
6061 * Basic glob-exporting: 'export foo::*;'
6062 * Alt now exhaustive, 'alt check' for runtime-checked
6063 * Block-function form of 'for' loop, with 'break' and 'ret'.
6066 * AST quasi-quote syntax extension
6067 * Revived libuv interface
6068 * New modules: core::{future, iter}, std::arena
6069 * Merged per-platform std::{os*, fs*} to core::{libc, os}
6070 * Extensive cleanup, regularization in libstd, libcore
6073 Version 0.1 (2012-01-20)
6074 ===============================
6076 * Most language features work, including:
6077 * Unique pointers, unique closures, move semantics
6078 * Interface-constrained generics
6079 * Static interface dispatch
6081 * Multithread task scheduling
6082 * Typestate predicates
6083 * Failure unwinding, destructors
6084 * Pattern matching and destructuring assignment
6085 * Lightweight block-lambda syntax
6086 * Preliminary macro-by-example
6088 * Compiler works with the following configurations:
6089 * Linux: x86 and x86_64 hosts and targets
6090 * macOS: x86 and x86_64 hosts and targets
6091 * Windows: x86 hosts and targets
6093 * Cross compilation / multi-target configuration supported.
6095 * Preliminary API-documentation and package-management tools included.
6099 * Documentation is incomplete.
6101 * Performance is below intended target.
6103 * Standard library APIs are subject to extensive change, reorganization.
6105 * Language-level versioning is not yet operational - future code will