1 Version 1.20.0 (2017-08-31)
2 ===========================
6 - [Associated constants are now stabilised.][42809]
7 - [A lot of macro bugs are now fixed.][42913]
12 - [Struct fields are now properly coerced to the expected field type.][42807]
13 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
14 `wasm32-experimental-emscripten` target.
15 - [Changed some of the error messages to be more helpful.][42033]
16 - [Add support for RELRO(RELocation Read-Only) for platforms that support
18 - [rustc now reports the total number of errors on compilation failure][43015]
19 previously this was only the number of errors in the pass that failed.
20 - [Expansion in rustc has been sped up 29x.][42533]
21 - [added `msp430-none-elf` target.][43099]
22 - [rustc will now suggest one-argument enum variant to fix type mismatch when
24 - [Fixes backtraces on Redox][43228]
25 - [rustc now identifies different versions of same crate when absolute paths of
26 different types match in an error message.][42826]
32 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
33 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
35 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
36 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
37 - [Impl `Clone` for `DefaultHasher`.][42799]
38 - [Impl `Sync` for `SyncSender`.][42397]
39 - [Impl `FromStr` for `char`][42271]
40 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
42 - [allow messages in the `unimplemented!()` macro.][42155]
43 ie. `unimplemented!("Waiting for 1.21 to be stable")`
44 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
45 - [Upgrade to Unicode 10.0.0][42999]
46 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
47 - [Skip the main thread's manual stack guard on Linux][43072]
48 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
49 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
51 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
56 - [`CStr::into_c_string`]
57 - [`CString::as_c_str`]
58 - [`CString::into_boxed_c_str`]
61 - [`Chain::into_inner`]
62 - [`Option::get_or_insert_with`]
63 - [`Option::get_or_insert`]
64 - [`OsStr::into_os_string`]
65 - [`OsString::into_boxed_os_str`]
68 - [`Utf8Error::error_len`]
69 - [`char::EscapeDebug`]
70 - [`char::escape_debug`]
76 - [`mem::ManuallyDrop`]
77 - [`slice::sort_unstable_by_key`]
78 - [`slice::sort_unstable_by`]
79 - [`slice::sort_unstable`]
80 - [`str::from_boxed_utf8_unchecked`]
81 - [`str::as_bytes_mut`]
82 - [`str::as_bytes_mut`]
83 - [`str::from_utf8_mut`]
84 - [`str::from_utf8_unchecked_mut`]
86 - [`str::get_unchecked_mut`]
87 - [`str::get_unchecked`]
89 - [`str::into_boxed_bytes`]
94 - [Cargo API token location moved from `~/.cargo/config` to
95 `~/.cargo/credentials`.][cargo/3978]
96 - [Cargo will now build `main.rs` binaries that are in sub-directories of
97 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
98 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
99 - [You can now specify version of a binary when installed through
100 `cargo install` using `--vers`.][cargo/4229]
101 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
102 failure.][cargo/4248]
103 - [Changed the convention around which file is the crate root.][cargo/4259]
104 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
105 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
110 - [Functions with `'static` in their return types will now not be as usable as
111 if they were using lifetime parameters instead.][42417]
112 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
113 takes the sign of NaN into account where previously didn't.][42430]
115 [42033]: https://github.com/rust-lang/rust/pull/42033
116 [42155]: https://github.com/rust-lang/rust/pull/42155
117 [42271]: https://github.com/rust-lang/rust/pull/42271
118 [42397]: https://github.com/rust-lang/rust/pull/42397
119 [42417]: https://github.com/rust-lang/rust/pull/42417
120 [42430]: https://github.com/rust-lang/rust/pull/42430
121 [42431]: https://github.com/rust-lang/rust/pull/42431
122 [42533]: https://github.com/rust-lang/rust/pull/42533
123 [42571]: https://github.com/rust-lang/rust/pull/42571
124 [42613]: https://github.com/rust-lang/rust/pull/42613
125 [42799]: https://github.com/rust-lang/rust/pull/42799
126 [42807]: https://github.com/rust-lang/rust/pull/42807
127 [42809]: https://github.com/rust-lang/rust/pull/42809
128 [42822]: https://github.com/rust-lang/rust/pull/42822
129 [42826]: https://github.com/rust-lang/rust/pull/42826
130 [42854]: https://github.com/rust-lang/rust/pull/42854
131 [42913]: https://github.com/rust-lang/rust/pull/42913
132 [42999]: https://github.com/rust-lang/rust/pull/42999
133 [43011]: https://github.com/rust-lang/rust/pull/43011
134 [43015]: https://github.com/rust-lang/rust/pull/43015
135 [43072]: https://github.com/rust-lang/rust/pull/43072
136 [43077]: https://github.com/rust-lang/rust/pull/43077
137 [43097]: https://github.com/rust-lang/rust/pull/43097
138 [43099]: https://github.com/rust-lang/rust/pull/43099
139 [43170]: https://github.com/rust-lang/rust/pull/43170
140 [43178]: https://github.com/rust-lang/rust/pull/43178
141 [43185]: https://github.com/rust-lang/rust/pull/43185
142 [43228]: https://github.com/rust-lang/rust/pull/43228
143 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
144 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
145 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
146 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
147 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
148 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
149 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
150 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
151 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
152 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
153 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
154 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
155 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
156 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
157 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
158 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
159 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
160 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
161 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
162 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
163 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
164 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
165 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
166 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
167 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
168 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
169 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
170 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
171 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
172 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
173 [`ste::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
174 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
175 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
176 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
177 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
178 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
179 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
180 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
181 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
184 Version 1.19.0 (2017-07-20)
185 ===========================
190 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
191 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
192 - [Macro recursion limit increased to 1024 from 64.][41676]
193 - [Added lint for detecting unused macros.][41907]
194 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
195 For example: `let x = loop { break 7; };`
196 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
197 contain `Copy` types and cannot have a `Drop` implementation.
198 Example: `union Foo { bar: u8, baz: usize }`
199 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
200 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
205 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
206 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
207 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
208 you should use `--target armv7-linux-androideabi`.
209 - [Fixed ICE when removing a source file between compilation sessions.][41873]
210 - [Minor optimisation of string operations.][42037]
211 - [Compiler error message is now `aborting due to previous error(s)` instead of
212 `aborting due to N previous errors`][42150] This was previously inaccurate and
213 would only count certain kinds of errors.
214 - [The compiler now supports Visual Studio 2017][42225]
215 - [The compiler is now built against LLVM 4.0.1 by default][42948]
216 - [Added a lot][42264] of [new error codes][42302]
217 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
218 libraries with C Run-time Libraries(CRT) to be statically linked.
219 - [Fixed various ARM codegen bugs][42740]
224 - [`String` now implements `FromIterator<Cow<'a, str>>` and
225 `Extend<Cow<'a, str>>`][41449]
226 - [`Vec` now implements `From<&mut [T]>`][41530]
227 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
228 - [`SplitWhitespace` now implements `Clone`][41659]
229 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
231 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
232 macros, but for printing to stderr.
237 - [`OsString::shrink_to_fit`]
240 - [`thread::ThreadId`]
245 - [Build scripts can now add environment variables to the environment
246 the crate is being compiled in.
247 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
248 - [Subcommands now replace the current process rather than spawning a new
249 child process][cargo/3970]
250 - [Workspace members can now accept glob file patterns][cargo/3979]
251 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
252 the members in a given workspace.][cargo/3988]
253 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
254 - [Target directory path is now in the cargo metadata][cargo/4022]
255 - [Cargo no longer checks out a local working directory for the
256 crates.io index][cargo/4026] This should provide smaller file size for the
257 registry, and improve cloning times, especially on Windows machines.
258 - [Added an `--exclude` option for excluding certain packages when using the
259 `--all` option][cargo/4031]
260 - [Cargo will now automatically retry when receiving a 5xx error
261 from crates.io][cargo/4032]
262 - [The `--features` option now accepts multiple comma or space
263 delimited values.][cargo/4084]
264 - [Added support for custom target specific runners][cargo/3954]
269 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
271 - [Rust will now release XZ compressed packages][rust-installer/57]
272 - [rustup will now prefer to download rust packages with
273 XZ compression][rustup/1100] over GZip packages.
274 - [Added the ability to escape `#` in rust documentation][41785] By adding
275 additional `#`'s ie. `##` is now `#`
280 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
281 - [`-Z` flags are now no longer allowed to be used on the stable
282 compiler.][41751] This has been a warning for a year previous to this.
283 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
284 longer works][42844]. Users should migrate to the built-in `check`
285 command, which has been available since 1.16.
286 - [Ending a float literal with `._` is now a hard error.
287 Example: `42._` .][41946]
288 - [Any use of a private `extern crate` outside of its module is now a
289 hard error.][36886] This was previously a warning.
290 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
291 relative while the `::` prefix makes a path absolute, but was ignored and the
292 path was relative regardless.
293 - [Floating point constants in match patterns is now a hard error][36890]
294 This was previously a warning.
295 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
296 match patterns is now a hard error][36891] This was previously a warning.
297 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
299 - [From the pound escape, lines consisting of multiple `#`s are
301 - [It is an error to reexport private enum variants][42460]. This is
302 known to break a number of crates that depend on an older version of
304 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
305 to use it to find the linker, and the build will fail where it did
306 not previously][42607]
308 [36886]: https://github.com/rust-lang/rust/issues/36886
309 [36888]: https://github.com/rust-lang/rust/issues/36888
310 [36890]: https://github.com/rust-lang/rust/issues/36890
311 [36891]: https://github.com/rust-lang/rust/issues/36891
312 [36892]: https://github.com/rust-lang/rust/issues/36892
313 [37406]: https://github.com/rust-lang/rust/issues/37406
314 [39983]: https://github.com/rust-lang/rust/pull/39983
315 [41145]: https://github.com/rust-lang/rust/pull/41145
316 [41192]: https://github.com/rust-lang/rust/pull/41192
317 [41258]: https://github.com/rust-lang/rust/pull/41258
318 [41370]: https://github.com/rust-lang/rust/pull/41370
319 [41449]: https://github.com/rust-lang/rust/pull/41449
320 [41530]: https://github.com/rust-lang/rust/pull/41530
321 [41624]: https://github.com/rust-lang/rust/pull/41624
322 [41656]: https://github.com/rust-lang/rust/pull/41656
323 [41659]: https://github.com/rust-lang/rust/pull/41659
324 [41676]: https://github.com/rust-lang/rust/pull/41676
325 [41751]: https://github.com/rust-lang/rust/pull/41751
326 [41764]: https://github.com/rust-lang/rust/pull/41764
327 [41785]: https://github.com/rust-lang/rust/pull/41785
328 [41873]: https://github.com/rust-lang/rust/pull/41873
329 [41907]: https://github.com/rust-lang/rust/pull/41907
330 [41946]: https://github.com/rust-lang/rust/pull/41946
331 [42016]: https://github.com/rust-lang/rust/pull/42016
332 [42037]: https://github.com/rust-lang/rust/pull/42037
333 [42068]: https://github.com/rust-lang/rust/pull/42068
334 [42150]: https://github.com/rust-lang/rust/pull/42150
335 [42162]: https://github.com/rust-lang/rust/pull/42162
336 [42225]: https://github.com/rust-lang/rust/pull/42225
337 [42264]: https://github.com/rust-lang/rust/pull/42264
338 [42302]: https://github.com/rust-lang/rust/pull/42302
339 [42460]: https://github.com/rust-lang/rust/issues/42460
340 [42607]: https://github.com/rust-lang/rust/issues/42607
341 [42740]: https://github.com/rust-lang/rust/pull/42740
342 [42844]: https://github.com/rust-lang/rust/issues/42844
343 [42948]: https://github.com/rust-lang/rust/pull/42948
344 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
345 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
346 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
347 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
348 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
349 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
350 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
351 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
352 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
353 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
354 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
355 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
356 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
357 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
358 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
359 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
360 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
361 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
362 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
363 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
364 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
365 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
368 Version 1.18.0 (2017-06-08)
369 ===========================
374 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
375 make the item visible to just that module tree. Also accepts the keyword
376 `crate` to make something public to the whole crate but not users of the
377 library. Example: `pub(crate) mod utils;`. [RFC 1422].
378 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
379 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
380 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
381 types like `Write + Send`, trailing `+` are now supported in trait objects,
382 and better error reporting for trait objects starting with `?Sized`.
383 - [0e+10 is now a valid floating point literal][40589]
384 - [Now warns if you bind a lifetime parameter to 'static][40734]
385 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
386 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
387 representation in some cases.][40377]
392 - [rustc can now emit mir with `--emit mir`][39891]
393 - [Improved LLVM IR for trivial functions][40367]
394 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
395 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
396 opportunities found through profiling
397 - [Improved backtrace formatting when panicking][38165]
402 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
403 iterator hasn't been advanced the original `Vec` is reassembled with no actual
404 iteration or reallocation.
405 - [Simplified HashMap Bucket interface][40561] provides performance
406 improvements for iterating and cloning.
407 - [Specialize Vec::from_elem to use calloc][40409]
408 - [Fixed Race condition in fs::create_dir_all][39799]
409 - [No longer caching stdio on Windows][40516]
410 - [Optimized insertion sort in slice][40807] insertion sort in some cases
411 2.50%~ faster and in one case now 12.50% faster.
412 - [Optimized `AtomicBool::fetch_nand`][41143]
417 - [`Child::try_wait`]
418 - [`HashMap::retain`]
419 - [`HashSet::retain`]
421 - [`TcpStream::peek`]
422 - [`UdpSocket::peek`]
423 - [`UdpSocket::peek_from`]
428 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
429 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
430 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
431 - [Added Android build support][cargo/3885]
432 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
433 of a certain type, for example `cargo build --bins` will build all
435 - [Added support for haiku][cargo/3952]
440 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
441 - [Added rust-winbg script for better debugging on Windows][39983]
442 - [Rust now uses the official cross compiler for NetBSD][40612]
443 - [rustdoc now accepts `#` at the start of files][40828]
444 - [Fixed jemalloc support for musl][41168]
449 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
450 always placed after the sign if it exists and before the digits. With the `#`
451 flag the zeroes are placed after the prefix and before the digits.
452 - [Due to the struct field optimisation][40377], using `transmute` on structs
453 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
454 always been undefined behavior, but is now more likely to break in practice.
455 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
456 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
457 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
458 - [Overlapping inherent `impl`s are now a hard error][40728]
459 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
460 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
461 `out.asm` and `out.ll` instead of only one of the filetypes.
462 - [ calling a function that returns `Self` will no longer work][41805] when
463 the size of `Self` cannot be statically determined.
464 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
465 this has caused a few regressions namely:
467 - Changed the link order of local static/dynamic libraries (respecting the
468 order on given rather than having the compiler reorder).
469 - Changed how MinGW is linked, native code linked to dynamic libraries
470 may require manually linking to the gcc support library (for the native
473 [38165]: https://github.com/rust-lang/rust/pull/38165
474 [39799]: https://github.com/rust-lang/rust/pull/39799
475 [39891]: https://github.com/rust-lang/rust/pull/39891
476 [39983]: https://github.com/rust-lang/rust/pull/39983
477 [40043]: https://github.com/rust-lang/rust/pull/40043
478 [40241]: https://github.com/rust-lang/rust/pull/40241
479 [40338]: https://github.com/rust-lang/rust/pull/40338
480 [40367]: https://github.com/rust-lang/rust/pull/40367
481 [40377]: https://github.com/rust-lang/rust/pull/40377
482 [40409]: https://github.com/rust-lang/rust/pull/40409
483 [40516]: https://github.com/rust-lang/rust/pull/40516
484 [40556]: https://github.com/rust-lang/rust/pull/40556
485 [40561]: https://github.com/rust-lang/rust/pull/40561
486 [40589]: https://github.com/rust-lang/rust/pull/40589
487 [40612]: https://github.com/rust-lang/rust/pull/40612
488 [40723]: https://github.com/rust-lang/rust/pull/40723
489 [40728]: https://github.com/rust-lang/rust/pull/40728
490 [40731]: https://github.com/rust-lang/rust/pull/40731
491 [40734]: https://github.com/rust-lang/rust/pull/40734
492 [40805]: https://github.com/rust-lang/rust/pull/40805
493 [40807]: https://github.com/rust-lang/rust/pull/40807
494 [40828]: https://github.com/rust-lang/rust/pull/40828
495 [40870]: https://github.com/rust-lang/rust/pull/40870
496 [41085]: https://github.com/rust-lang/rust/pull/41085
497 [41143]: https://github.com/rust-lang/rust/pull/41143
498 [41168]: https://github.com/rust-lang/rust/pull/41168
499 [41270]: https://github.com/rust-lang/rust/issues/41270
500 [41469]: https://github.com/rust-lang/rust/pull/41469
501 [41805]: https://github.com/rust-lang/rust/issues/41805
502 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
503 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
504 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
505 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
506 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
507 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
508 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
509 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
510 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
511 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
512 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
513 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
514 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
515 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
518 Version 1.17.0 (2017-04-27)
519 ===========================
524 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
525 * [Fields of structs may be initialized without duplicating the field/variable
526 names][39761]. [RFC 1682]
527 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
528 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
529 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
530 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
532 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
533 * [Static variables may contain references to other statics][40027]
538 * [Exit quickly on only `--emit dep-info`][40336]
539 * [Make `-C relocation-model` more correctly determine whether the linker
540 creates a position-independent executable][40245]
541 * [Add `-C overflow-checks` to directly control whether integer overflow
543 * [The rustc type checker now checks items on demand instead of in a single
544 in-order pass][40008]. This is mostly an internal refactoring in support of
545 future work, including incremental type checking, but also resolves [RFC
546 1647], allowing `Self` to appear in `impl` `where` clauses.
547 * [Optimize vtable loads][39995]
548 * [Turn off vectorization for Emscripten targets][39990]
549 * [Provide suggestions for unknown macros imported with `use`][39953]
550 * [Fix ICEs in path resolution][39939]
551 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
552 * [Add clearer error message using `&str + &str`][39116]
564 * [`Ordering::then_with`]
565 * [`BTreeMap::range`]
566 * [`BTreeMap::range_mut`]
567 * [`collections::Bound`]
569 * [`ptr::read_unaligned`]
570 * [`ptr::write_unaligned`]
571 * [`Result::expect_err`]
574 * [`Cell::into_inner`]
580 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
581 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
582 * [`String` implements `FromIterator<&char>`][40028]
583 * `Box` [implements][40009] a number of new conversions:
584 `From<Box<str>> for String`,
585 `From<Box<[T]>> for Vec<T>`,
586 `From<Box<CStr>> for CString`,
587 `From<Box<OsStr>> for OsString`,
588 `From<Box<Path>> for PathBuf`,
589 `Into<Box<str>> for String`,
590 `Into<Box<[T]>> for Vec<T>`,
591 `Into<Box<CStr>> for CString`,
592 `Into<Box<OsStr>> for OsString`,
593 `Into<Box<Path>> for PathBuf`,
594 `Default for Box<str>`,
595 `Default for Box<CStr>`,
596 `Default for Box<OsStr>`,
597 `From<&CStr> for Box<CStr>`,
598 `From<&OsStr> for Box<OsStr>`,
599 `From<&Path> for Box<Path>`
600 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
601 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
602 * [Slightly optimize `slice::sort`][39538]
603 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
604 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
605 `Box<str>` implements `From<&str>`][39438]
606 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
607 `From<(I, u16)> where I: Into<IpAddr>`][39372]
608 * [`format!` estimates the needed capacity before writing a string][39356]
609 * [Support unprivileged symlink creation in Windows][38921]
610 * [`PathBuf` implements `Default`][38764]
611 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
612 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
613 and poor hash functions.
618 * [Add `cargo check --all`][cargo/3731]
619 * [Add an option to ignore SSL revocation checking][cargo/3699]
620 * [Add `cargo run --package`][cargo/3691]
621 * [Add `required_features`][cargo/3667]
622 * [Assume `build.rs` is a build script][cargo/3664]
623 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
628 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
630 * [The "Unstable Book" documents nightly-only features][ubook]
631 * [Improve the style of the sidebar in rustdoc output][40265]
632 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
633 * [Fix MSP430 breakage due to `i128`][40257]
634 * [Preliminary Solaris/SPARCv9 support][39903]
635 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
636 run without installing the MSVC runtime.
637 * [`rustdoc --test` includes file names in test names][39788]
638 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
639 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
640 * [Initial support for `aarch64-unknown-freebsd`][39491]
641 * [Initial support for `i686-unknown-netbsd`][39426]
642 * [This release no longer includes the old makefile build system][39431]. Rust
643 is built with a custom build system, written in Rust, and with Cargo.
644 * [Add Debug implementations for libcollection structs][39002]
645 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
646 * [`--test-threads=0` produces an error][38945]
647 * [`rustup` installs documentation by default][40526]
648 * [The Rust source includes NatVis visualizations][39843]. These can be used by
649 WinDbg and Visual Studio to improve the debugging experience.
654 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
655 workaround, either use MSVC 2015 or run vcvars.bat.
656 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
657 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
658 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
660 * [`format!` and `Display::to_string` panic if an underlying formatting
661 implementation returns an error][40117]. Previously the error was silently
662 ignored. It is incorrect for `write_fmt` to return an error when writing
664 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
665 crates were marked stable and could be accessed from the stable toolchain.
666 * [Rust git source no longer includes vendored crates][39728]. Those that need
667 to build with vendored crates should build from release tarballs.
668 * [Fix inert attributes from `proc_macro_derives`][39572]
669 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
670 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
672 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
673 existing code generally ignores the type of dead-code unless a type-hint is
674 provided; this can cause surprising inference interactions particularly around
675 defaulting. The new code uniformly ignores the result type of dead-code.
676 * [Tuple-struct constructors with private fields are no longer visible][38932]
677 * [Lifetime parameters that do not appear in the arguments are now considered
678 early-bound][38897], resolving a soundness bug (#[32330]). The
679 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
681 * [rustdoc: fix doctests with non-feature crate attributes][38161]
682 * [Make transmuting from fn item types to pointer-sized types a hard
685 [27787]: https://github.com/rust-lang/rust/issues/27787
686 [32330]: https://github.com/rust-lang/rust/issues/32330
687 [34198]: https://github.com/rust-lang/rust/pull/34198
688 [38161]: https://github.com/rust-lang/rust/pull/38161
689 [38368]: https://github.com/rust-lang/rust/pull/38368
690 [38584]: https://github.com/rust-lang/rust/issues/38584
691 [38661]: https://github.com/rust-lang/rust/pull/38661
692 [38764]: https://github.com/rust-lang/rust/pull/38764
693 [38864]: https://github.com/rust-lang/rust/issues/38864
694 [38897]: https://github.com/rust-lang/rust/pull/38897
695 [38921]: https://github.com/rust-lang/rust/pull/38921
696 [38932]: https://github.com/rust-lang/rust/pull/38932
697 [38945]: https://github.com/rust-lang/rust/pull/38945
698 [38981]: https://github.com/rust-lang/rust/pull/38981
699 [39002]: https://github.com/rust-lang/rust/pull/39002
700 [39116]: https://github.com/rust-lang/rust/pull/39116
701 [39193]: https://github.com/rust-lang/rust/pull/39193
702 [39265]: https://github.com/rust-lang/rust/pull/39265
703 [39356]: https://github.com/rust-lang/rust/pull/39356
704 [39372]: https://github.com/rust-lang/rust/pull/39372
705 [39426]: https://github.com/rust-lang/rust/pull/39426
706 [39431]: https://github.com/rust-lang/rust/pull/39431
707 [39438]: https://github.com/rust-lang/rust/pull/39438
708 [39440]: https://github.com/rust-lang/rust/pull/39440
709 [39485]: https://github.com/rust-lang/rust/pull/39485
710 [39491]: https://github.com/rust-lang/rust/pull/39491
711 [39518]: https://github.com/rust-lang/rust/pull/39518
712 [39538]: https://github.com/rust-lang/rust/pull/39538
713 [39572]: https://github.com/rust-lang/rust/pull/39572
714 [39633]: https://github.com/rust-lang/rust/pull/39633
715 [39642]: https://github.com/rust-lang/rust/pull/39642
716 [39728]: https://github.com/rust-lang/rust/pull/39728
717 [39761]: https://github.com/rust-lang/rust/pull/39761
718 [39788]: https://github.com/rust-lang/rust/pull/39788
719 [39793]: https://github.com/rust-lang/rust/pull/39793
720 [39837]: https://github.com/rust-lang/rust/pull/39837
721 [39843]: https://github.com/rust-lang/rust/pull/39843
722 [39851]: https://github.com/rust-lang/rust/pull/39851
723 [39903]: https://github.com/rust-lang/rust/pull/39903
724 [39939]: https://github.com/rust-lang/rust/pull/39939
725 [39953]: https://github.com/rust-lang/rust/pull/39953
726 [39960]: https://github.com/rust-lang/rust/pull/39960
727 [39990]: https://github.com/rust-lang/rust/pull/39990
728 [39995]: https://github.com/rust-lang/rust/pull/39995
729 [40008]: https://github.com/rust-lang/rust/pull/40008
730 [40009]: https://github.com/rust-lang/rust/pull/40009
731 [40027]: https://github.com/rust-lang/rust/pull/40027
732 [40028]: https://github.com/rust-lang/rust/pull/40028
733 [40037]: https://github.com/rust-lang/rust/pull/40037
734 [40117]: https://github.com/rust-lang/rust/pull/40117
735 [40166]: https://github.com/rust-lang/rust/pull/40166
736 [40245]: https://github.com/rust-lang/rust/pull/40245
737 [40257]: https://github.com/rust-lang/rust/pull/40257
738 [40261]: https://github.com/rust-lang/rust/pull/40261
739 [40265]: https://github.com/rust-lang/rust/pull/40265
740 [40319]: https://github.com/rust-lang/rust/pull/40319
741 [40336]: https://github.com/rust-lang/rust/pull/40336
742 [40526]: https://github.com/rust-lang/rust/pull/40526
743 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
744 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
745 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
746 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
747 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
748 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
749 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
750 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
751 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
752 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
753 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
754 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
755 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
756 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
757 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
758 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
759 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
760 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
761 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
762 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
763 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
764 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
765 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
766 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
767 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
768 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
769 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
770 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
771 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
772 [mdbook]: https://crates.io/crates/mdbook
773 [ubook]: https://doc.rust-lang.org/unstable-book/
776 Version 1.16.0 (2017-03-16)
777 ===========================
782 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
783 * [Uninhabitable enums (those without any variants) no longer permit wildcard
784 match patterns][38069]
785 * [Clean up semantics of `self` in an import list][38313]
786 * [`Self` may appear in `impl` headers][38920]
787 * [`Self` may appear in struct expressions][39282]
792 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
793 a `.rmeta` file containing only crate metadata][38571]. This can be
794 used by tools like the Rust Language Service to perform
795 metadata-only builds.
796 * [Levenshtein based typo suggestions now work in most places, while
797 previously they worked only for fields and sometimes for local
798 variables][38927]. Together with the overhaul of "no
799 resolution"/"unexpected resolution" errors (#[38154]) they result in
800 large and systematic improvement in resolution diagnostics.
801 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
803 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
804 * [`rustc` no longer attempts to provide "consider using an explicit
805 lifetime" suggestions][37057]. They were inaccurate.
810 * [`VecDeque::truncate`]
811 * [`VecDeque::resize`]
812 * [`String::insert_str`]
813 * [`Duration::checked_add`]
814 * [`Duration::checked_sub`]
815 * [`Duration::checked_div`]
816 * [`Duration::checked_mul`]
819 * [`SocketAddr::is_ipv4`]
820 * [`SocketAddr::is_ipv6`]
821 * [`IpAddr::is_ipv4`]
822 * [`IpAddr::is_ipv6`]
824 * [`Vec::dedup_by_key`]
825 * [`Result::unwrap_or_default`]
826 * [`<*const T>::wrapping_offset`]
827 * [`<*mut T>::wrapping_offset`]
828 * `CommandExt::creation_flags`
829 * [`File::set_permissions`]
830 * [`String::split_off`]
835 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
836 their argument by `Borrow` parameter][37761]
837 * [All public types in std implement `Debug`][38006]
838 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
839 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
840 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
842 * [std: Fix partial writes in `LineWriter`][38062]
843 * [std: Clamp max read/write sizes on Unix][38062]
844 * [Use more specific panic message for `&str` slicing errors][38066]
845 * [`TcpListener::set_only_v6` is deprecated][38304]. This
846 functionality cannot be achieved in std currently.
847 * [`writeln!`, like `println!`, now accepts a form with no string
848 or formatting arguments, to just print a newline][38469]
849 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
850 * [Reduce the size of static data in `std_unicode::tables`][38781]
851 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
852 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
854 * [`Duration` implements `Sum`][38712]
855 * [`String` implements `ToSocketAddrs`][39048]
860 * [The `cargo check` command does a type check of a project without
861 building it][cargo/3296]
862 * [crates.io will display CI badges from Travis and AppVeyor, if
863 specified in Cargo.toml][cargo/3546]
864 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
865 * [Compilation profiles accept integer values for `debug`, in addition
866 to `true` and `false`. These are passed to `rustc` as the value to
867 `-C debuginfo`][cargo/3534]
868 * [Implement `cargo --version --verbose`][cargo/3604]
869 * [All builds now output 'dep-info' build dependencies compatible with
870 make and ninja][cargo/3557]
871 * [Build all workspace members with `build --all`][cargo/3511]
872 * [Document all workspace members with `doc --all`][cargo/3515]
873 * [Path deps outside workspace are not members][cargo/3443]
878 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
879 the path to the Rust implementation][38589]
880 * [The `armv7-linux-androideabi` target no longer enables NEON
881 extensions, per Google's ABI guide][38413]
882 * [The stock standard library can be compiled for Redox OS][38401]
883 * [Rust has initial SPARC support][38726]. Tier 3. No builds
885 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
887 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
892 * [Uninhabitable enums (those without any variants) no longer permit wildcard
893 match patterns][38069]
894 * In this release, references to uninhabited types can not be
895 pattern-matched. This was accidentally allowed in 1.15.
896 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
897 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
899 * [Clean up semantics of `self` in an import list][38313]
900 * Reimplemented lifetime elision. This change was almost entirely compatible
901 with existing code, but it did close a number of small bugs and loopholes,
902 as well as being more accepting in some other [cases][41105].
904 [37057]: https://github.com/rust-lang/rust/pull/37057
905 [37761]: https://github.com/rust-lang/rust/pull/37761
906 [38006]: https://github.com/rust-lang/rust/pull/38006
907 [38051]: https://github.com/rust-lang/rust/pull/38051
908 [38062]: https://github.com/rust-lang/rust/pull/38062
909 [38062]: https://github.com/rust-lang/rust/pull/38622
910 [38066]: https://github.com/rust-lang/rust/pull/38066
911 [38069]: https://github.com/rust-lang/rust/pull/38069
912 [38131]: https://github.com/rust-lang/rust/pull/38131
913 [38154]: https://github.com/rust-lang/rust/pull/38154
914 [38274]: https://github.com/rust-lang/rust/pull/38274
915 [38304]: https://github.com/rust-lang/rust/pull/38304
916 [38313]: https://github.com/rust-lang/rust/pull/38313
917 [38314]: https://github.com/rust-lang/rust/pull/38314
918 [38327]: https://github.com/rust-lang/rust/pull/38327
919 [38401]: https://github.com/rust-lang/rust/pull/38401
920 [38413]: https://github.com/rust-lang/rust/pull/38413
921 [38469]: https://github.com/rust-lang/rust/pull/38469
922 [38559]: https://github.com/rust-lang/rust/pull/38559
923 [38571]: https://github.com/rust-lang/rust/pull/38571
924 [38580]: https://github.com/rust-lang/rust/pull/38580
925 [38589]: https://github.com/rust-lang/rust/pull/38589
926 [38670]: https://github.com/rust-lang/rust/pull/38670
927 [38712]: https://github.com/rust-lang/rust/pull/38712
928 [38726]: https://github.com/rust-lang/rust/pull/38726
929 [38781]: https://github.com/rust-lang/rust/pull/38781
930 [38798]: https://github.com/rust-lang/rust/pull/38798
931 [38909]: https://github.com/rust-lang/rust/pull/38909
932 [38920]: https://github.com/rust-lang/rust/pull/38920
933 [38927]: https://github.com/rust-lang/rust/pull/38927
934 [39048]: https://github.com/rust-lang/rust/pull/39048
935 [39282]: https://github.com/rust-lang/rust/pull/39282
936 [39379]: https://github.com/rust-lang/rust/pull/39379
937 [41105]: https://github.com/rust-lang/rust/issues/41105
938 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
939 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
940 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
941 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
942 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
943 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
944 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
945 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
946 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
947 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
948 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
949 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
950 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
951 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
952 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
953 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
954 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
955 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
956 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
957 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
958 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
959 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
960 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
961 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
962 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
963 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
964 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
965 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
966 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
967 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
970 Version 1.15.1 (2017-02-09)
971 ===========================
973 * [Fix IntoIter::as_mut_slice's signature][39466]
974 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
976 [39466]: https://github.com/rust-lang/rust/pull/39466
977 [39523]: https://github.com/rust-lang/rust/pull/39523
980 Version 1.15.0 (2017-02-02)
981 ===========================
986 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
987 stable. This allows popular code-generating crates like Serde and Diesel to
988 work ergonomically. [RFC 1681].
989 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
990 with curly braces][36868]. Part of [RFC 1506].
991 * [A number of minor changes to name resolution have been activated][37127].
992 They add up to more consistent semantics, allowing for future evolution of
993 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
994 details of what is different. The breaking changes here have been transitioned
995 through the [`legacy_imports`] lint since 1.14, with no known regressions.
996 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
998 * [`?Sized` can be used in `where` clauses][37791]
999 * [There is now a limit on the size of monomorphized types and it can be
1000 modified with the `#![type_size_limit]` crate attribute, similarly to
1001 the `#![recursion_limit]` attribute][37789]
1006 * [On Windows, the compiler will apply dllimport attributes when linking to
1007 extern functions][37973]. Additional attributes and flags can control which
1008 library kind is linked and its name. [RFC 1717].
1009 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1010 * [The `--test` flag works with procedural macro crates][38107]
1011 * [Fix `extern "aapcs" fn` ABI][37814]
1012 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
1013 * [The `format!` expander recognizes incorrect `printf` and shell-style
1014 formatting directives and suggests the correct format][37613].
1015 * [Only report one error for all unused imports in an import list][37456]
1017 Compiler Performance
1018 --------------------
1020 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
1021 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
1022 * [Don't clone in `UnificationTable::probe`][37848]
1023 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
1024 * [Use small vectors in type walker][37760]
1025 * [Macro expansion performance was improved][37701]
1026 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
1027 * [Replace FNV with a faster hash function][37229]
1032 * [`std::iter::Iterator::min_by`]
1033 * [`std::iter::Iterator::max_by`]
1034 * [`std::os::*::fs::FileExt`]
1035 * [`std::sync::atomic::Atomic*::get_mut`]
1036 * [`std::sync::atomic::Atomic*::into_inner`]
1037 * [`std::vec::IntoIter::as_slice`]
1038 * [`std::vec::IntoIter::as_mut_slice`]
1039 * [`std::sync::mpsc::Receiver::try_iter`]
1040 * [`std::os::unix::process::CommandExt::before_exec`]
1041 * [`std::rc::Rc::strong_count`]
1042 * [`std::rc::Rc::weak_count`]
1043 * [`std::sync::Arc::strong_count`]
1044 * [`std::sync::Arc::weak_count`]
1045 * [`std::char::encode_utf8`]
1046 * [`std::char::encode_utf16`]
1047 * [`std::cell::Ref::clone`]
1048 * [`std::io::Take::into_inner`]
1053 * [The standard sorting algorithm has been rewritten for dramatic performance
1054 improvements][38192]. It is a hybrid merge sort, drawing influences from
1055 Timsort. Previously it was a naive merge sort.
1056 * [`Iterator::nth` no longer has a `Sized` bound][38134]
1057 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
1059 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
1060 and `char_indices().last()`][37882]
1061 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
1062 * [Chinese characters display correctly in `fmt::Debug`][37855]
1063 * [Derive `Default` for `Duration`][37699]
1064 * [Support creation of anonymous pipes on WinXP/2k][37677]
1065 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
1066 * [Don't pass overlapped handles to processes][38835]
1071 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1072 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1073 should instead check the variable at runtime with `std::env`. That the value
1074 was set at build time was a bug, and incorrect when cross-compiling. This
1075 change is known to cause breakage.
1076 * [Add `--all` flag to `cargo test`][cargo/3221]
1077 * [Compile statically against the MSVC CRT][cargo/3363]
1078 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
1079 * [Link OpenSSL statically on OSX][cargo/3311]
1080 * [Apply new fingerprinting to build dir outputs][cargo/3310]
1081 * [Test for bad path overrides with summaries][cargo/3336]
1082 * [Require `cargo install --vers` to take a semver version][cargo/3338]
1083 * [Fix retrying crate downloads for network errors][cargo/3348]
1084 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
1085 * [Emit more info on --message-format=json][cargo/3319]
1086 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
1087 * [Don't ignore errors in workspace manifest][cargo/3409]
1088 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
1093 * [Test runners (binaries built with `--test`) now support a `--list` argument
1094 that lists the tests it contains][38185]
1095 * [Test runners now support a `--exact` argument that makes the test filter
1096 match exactly, instead of matching only a substring of the test name][38181]
1097 * [rustdoc supports a `--playground-url` flag][37763]
1098 * [rustdoc provides more details about `#[should_panic]` errors][37749]
1103 * [The Rust build system is now written in Rust][37817]. The Makefiles may
1104 continue to be used in this release by passing `--disable-rustbuild` to the
1105 configure script, but they will be deleted soon. Note that the new build
1106 system uses a different on-disk layout that will likely affect any scripts
1108 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
1110 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
1111 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
1117 * [A number of minor changes to name resolution have been activated][37127].
1118 They add up to more consistent semantics, allowing for future evolution of
1119 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
1120 details of what is different. The breaking changes here have been transitioned
1121 through the [`legacy_imports`] lint since 1.14, with no known regressions.
1122 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
1123 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
1124 should instead check the variable at runtime with `std::env`. That the value
1125 was set at build time was a bug, and incorrect when cross-compiling. This
1126 change is known to cause breakage.
1127 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
1128 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
1129 1.10 and is now an error by default. It will become a hard error in the near
1131 * [The semantics relating modules to file system directories are changing in
1132 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
1133 lint, which is a warning in this release, and will become a hard error in the
1135 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
1136 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
1137 the underlying iterator][37834]
1139 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
1140 [33685]: https://github.com/rust-lang/rust/issues/33685
1141 [36868]: https://github.com/rust-lang/rust/pull/36868
1142 [37127]: https://github.com/rust-lang/rust/pull/37127
1143 [37229]: https://github.com/rust-lang/rust/pull/37229
1144 [37456]: https://github.com/rust-lang/rust/pull/37456
1145 [37527]: https://github.com/rust-lang/rust/pull/37527
1146 [37602]: https://github.com/rust-lang/rust/pull/37602
1147 [37613]: https://github.com/rust-lang/rust/pull/37613
1148 [37615]: https://github.com/rust-lang/rust/pull/37615
1149 [37636]: https://github.com/rust-lang/rust/pull/37636
1150 [37627]: https://github.com/rust-lang/rust/pull/37627
1151 [37642]: https://github.com/rust-lang/rust/pull/37642
1152 [37677]: https://github.com/rust-lang/rust/pull/37677
1153 [37699]: https://github.com/rust-lang/rust/pull/37699
1154 [37701]: https://github.com/rust-lang/rust/pull/37701
1155 [37705]: https://github.com/rust-lang/rust/pull/37705
1156 [37749]: https://github.com/rust-lang/rust/pull/37749
1157 [37760]: https://github.com/rust-lang/rust/pull/37760
1158 [37763]: https://github.com/rust-lang/rust/pull/37763
1159 [37764]: https://github.com/rust-lang/rust/pull/37764
1160 [37789]: https://github.com/rust-lang/rust/pull/37789
1161 [37791]: https://github.com/rust-lang/rust/pull/37791
1162 [37814]: https://github.com/rust-lang/rust/pull/37814
1163 [37817]: https://github.com/rust-lang/rust/pull/37817
1164 [37834]: https://github.com/rust-lang/rust/pull/37834
1165 [37848]: https://github.com/rust-lang/rust/pull/37848
1166 [37855]: https://github.com/rust-lang/rust/pull/37855
1167 [37882]: https://github.com/rust-lang/rust/pull/37882
1168 [37888]: https://github.com/rust-lang/rust/pull/37888
1169 [37973]: https://github.com/rust-lang/rust/pull/37973
1170 [37979]: https://github.com/rust-lang/rust/pull/37979
1171 [38086]: https://github.com/rust-lang/rust/pull/38086
1172 [38107]: https://github.com/rust-lang/rust/pull/38107
1173 [38117]: https://github.com/rust-lang/rust/pull/38117
1174 [38134]: https://github.com/rust-lang/rust/pull/38134
1175 [38146]: https://github.com/rust-lang/rust/pull/38146
1176 [38181]: https://github.com/rust-lang/rust/pull/38181
1177 [38182]: https://github.com/rust-lang/rust/pull/38182
1178 [38185]: https://github.com/rust-lang/rust/pull/38185
1179 [38192]: https://github.com/rust-lang/rust/pull/38192
1180 [38279]: https://github.com/rust-lang/rust/pull/38279
1181 [38835]: https://github.com/rust-lang/rust/pull/38835
1182 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1183 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
1184 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
1185 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
1186 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
1187 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
1188 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
1189 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
1190 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
1191 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
1192 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
1193 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
1194 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
1195 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
1196 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
1197 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
1198 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
1199 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
1200 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
1201 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
1202 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
1203 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
1204 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
1205 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
1206 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
1207 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
1208 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
1209 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
1210 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
1211 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
1212 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
1213 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
1214 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
1215 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
1216 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
1217 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
1218 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
1219 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
1222 Version 1.14.0 (2016-12-22)
1223 ===========================
1228 * [`..` matches multiple tuple fields in enum variants, structs
1229 and tuples][36843]. [RFC 1492].
1230 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
1231 * [`use *` and `use ::*` both glob-import from the crate root][37367]
1232 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
1233 dereferencing][36822]
1238 * [Mark enums with non-zero discriminant as non-zero][37224]
1239 * [Lower-case `static mut` names are linted like other
1240 statics and consts][37162]
1241 * [Fix ICE on some macros in const integer positions
1242 (e.g. `[u8; m!()]`)][36819]
1243 * [Improve error message and snippet for "did you mean `x`"][36798]
1244 * [Add a panic-strategy field to the target specification][36794]
1245 * [Include LLVM version in `--version --verbose`][37200]
1247 Compile-time Optimizations
1248 --------------------------
1250 * [Improve macro expansion performance][37569]
1251 * [Shrink `Expr_::ExprInlineAsm`][37445]
1252 * [Replace all uses of SHA-256 with BLAKE2b][37439]
1253 * [Reduce the number of bytes hashed by `IchHasher`][37427]
1254 * [Avoid more allocations when compiling html5ever][37373]
1255 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
1256 * [Avoid some allocations in the macro parser][37318]
1257 * [Use a faster deflate setting][37298]
1258 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
1259 during interning of slices][37270]
1260 * [Optimize `write_metadata`][37267]
1261 * [Don't process obligation forest cycles when stalled][37231]
1262 * [Avoid many `CrateConfig` clones][37161]
1263 * [Optimize `Substs::super_fold_with`][37108]
1264 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
1265 * [Speed up `plug_leaks`][36917]
1270 * [`println!()`, with no arguments, prints newline][36825].
1271 Previously, an empty string was required to achieve the same.
1272 * [`Wrapping` impls standard binary and unary operators, as well as
1273 the `Sum` and `Product` iterators][37356]
1274 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
1276 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
1277 `VecDeque` iterators][37315]
1278 * [Improve `SipHasher` performance on small values][37312]
1279 * [Add Iterator trait TrustedLen to enable better FromIterator /
1281 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
1282 * [`ReadDir` implements `Debug`][37221]
1283 * [Implement `RefUnwindSafe` for atomic types][37178]
1284 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
1285 * [Avoid allocations in `Decoder::read_str`][37064]
1286 * [`io::Error` implements `From<io::ErrorKind>`][37037]
1287 * [Impl `Debug` for raw pointers to unsized data][36880]
1288 * [Don't reuse `HashMap` random seeds][37470]
1289 * [The internal memory layout of `HashMap` is more cache-friendly, for
1290 significant improvements in some operations][36692]
1291 * [`HashMap` uses less memory on 32-bit architectures][36595]
1292 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
1297 * [Expose rustc cfg values to build scripts][cargo/3243]
1298 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
1299 * [Fix passing --features when testing multiple packages][cargo/3280]
1300 * [Use a single profile set per workspace][cargo/3249]
1301 * [Load `replace` sections from lock files][cargo/3220]
1302 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
1307 * [rustup is the recommended Rust installation method][1.14rustup]
1308 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
1309 S390x. These are [tier 2] platforms and may have major defects. Follow the
1310 instructions on the website to install, or add the targets to an existing
1311 installation with `rustup target add`. The new target triples are:
1312 - `mips-unknown-linux-gnu`
1313 - `mipsel-unknown-linux-gnu`
1314 - `mips64-unknown-linux-gnuabi64`
1315 - `mips64el-unknown-linux-gnuabi64 `
1316 - `powerpc-unknown-linux-gnu`
1317 - `powerpc64-unknown-linux-gnu`
1318 - `powerpc64le-unknown-linux-gnu`
1319 - `s390x-unknown-linux-gnu `
1320 * This release includes target (std) builds for ARM Linux running MUSL
1321 libc. These are [tier 2] platforms and may have major defects. Add the
1322 following triples to an existing rustup installation with `rustup target add`:
1323 - `arm-unknown-linux-musleabi`
1324 - `arm-unknown-linux-musleabihf`
1325 - `armv7-unknown-linux-musleabihf`
1326 * This release includes [experimental support for WebAssembly][1.14wasm], via
1327 the `wasm32-unknown-emscripten` target. This target is known to have major
1328 defects. Please test, report, and fix.
1329 * rustup no longer installs documentation by default. Run `rustup
1330 component add rust-docs` to install.
1331 * [Fix line stepping in debugger][37310]
1332 * [Enable line number debuginfo in releases][37280]
1337 * [Disable jemalloc on aarch64/powerpc/mips][37392]
1338 * [Add support for Fuchsia OS][37313]
1339 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
1344 * [A number of forward-compatibility lints used by the compiler
1345 to gradually introduce language changes have been converted
1346 to deny by default][36894]:
1347 - ["use of inaccessible extern crate erroneously allowed"][36886]
1348 - ["type parameter default erroneously allowed in invalid location"][36887]
1349 - ["detects super or self keywords at the beginning of global path"][36888]
1350 - ["two overlapping inherent impls define an item with the same name
1351 were erroneously allowed"][36889]
1352 - ["floating-point constants cannot be used in patterns"][36890]
1353 - ["constants of struct or enum type can only be used in a pattern if
1354 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
1355 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
1356 * [Prohibit patterns in trait methods without bodies][37378]
1357 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
1358 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
1359 * [The `$crate` macro variable is accepted in fewer locations][37213]
1360 * [Impls specifying extra region requirements beyond the trait
1361 they implement are rejected][37167]
1362 * [Enums may not be unsized][37111]. Unsized enums are intended to
1363 work but never have. For now they are forbidden.
1364 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
1366 [tier 2]: https://forge.rust-lang.org/platform-support.html
1367 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
1368 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
1369 [36430]: https://github.com/rust-lang/rust/pull/36430
1370 [36595]: https://github.com/rust-lang/rust/pull/36595
1371 [36595]: https://github.com/rust-lang/rust/pull/36595
1372 [36692]: https://github.com/rust-lang/rust/pull/36692
1373 [36767]: https://github.com/rust-lang/rust/pull/36767
1374 [36794]: https://github.com/rust-lang/rust/pull/36794
1375 [36798]: https://github.com/rust-lang/rust/pull/36798
1376 [36819]: https://github.com/rust-lang/rust/pull/36819
1377 [36822]: https://github.com/rust-lang/rust/pull/36822
1378 [36825]: https://github.com/rust-lang/rust/pull/36825
1379 [36843]: https://github.com/rust-lang/rust/pull/36843
1380 [36880]: https://github.com/rust-lang/rust/pull/36880
1381 [36886]: https://github.com/rust-lang/rust/issues/36886
1382 [36887]: https://github.com/rust-lang/rust/issues/36887
1383 [36888]: https://github.com/rust-lang/rust/issues/36888
1384 [36889]: https://github.com/rust-lang/rust/issues/36889
1385 [36890]: https://github.com/rust-lang/rust/issues/36890
1386 [36891]: https://github.com/rust-lang/rust/issues/36891
1387 [36892]: https://github.com/rust-lang/rust/issues/36892
1388 [36894]: https://github.com/rust-lang/rust/pull/36894
1389 [36917]: https://github.com/rust-lang/rust/pull/36917
1390 [36993]: https://github.com/rust-lang/rust/pull/36993
1391 [37037]: https://github.com/rust-lang/rust/pull/37037
1392 [37064]: https://github.com/rust-lang/rust/pull/37064
1393 [37094]: https://github.com/rust-lang/rust/pull/37094
1394 [37108]: https://github.com/rust-lang/rust/pull/37108
1395 [37111]: https://github.com/rust-lang/rust/pull/37111
1396 [37161]: https://github.com/rust-lang/rust/pull/37161
1397 [37162]: https://github.com/rust-lang/rust/pull/37162
1398 [37167]: https://github.com/rust-lang/rust/pull/37167
1399 [37178]: https://github.com/rust-lang/rust/pull/37178
1400 [37200]: https://github.com/rust-lang/rust/pull/37200
1401 [37213]: https://github.com/rust-lang/rust/pull/37213
1402 [37221]: https://github.com/rust-lang/rust/pull/37221
1403 [37224]: https://github.com/rust-lang/rust/pull/37224
1404 [37230]: https://github.com/rust-lang/rust/pull/37230
1405 [37231]: https://github.com/rust-lang/rust/pull/37231
1406 [37247]: https://github.com/rust-lang/rust/pull/37247
1407 [37267]: https://github.com/rust-lang/rust/pull/37267
1408 [37270]: https://github.com/rust-lang/rust/pull/37270
1409 [37273]: https://github.com/rust-lang/rust/pull/37273
1410 [37280]: https://github.com/rust-lang/rust/pull/37280
1411 [37298]: https://github.com/rust-lang/rust/pull/37298
1412 [37306]: https://github.com/rust-lang/rust/pull/37306
1413 [37310]: https://github.com/rust-lang/rust/pull/37310
1414 [37312]: https://github.com/rust-lang/rust/pull/37312
1415 [37313]: https://github.com/rust-lang/rust/pull/37313
1416 [37315]: https://github.com/rust-lang/rust/pull/37315
1417 [37318]: https://github.com/rust-lang/rust/pull/37318
1418 [37322]: https://github.com/rust-lang/rust/pull/37322
1419 [37326]: https://github.com/rust-lang/rust/pull/37326
1420 [37351]: https://github.com/rust-lang/rust/pull/37351
1421 [37356]: https://github.com/rust-lang/rust/pull/37356
1422 [37367]: https://github.com/rust-lang/rust/pull/37367
1423 [37373]: https://github.com/rust-lang/rust/pull/37373
1424 [37378]: https://github.com/rust-lang/rust/pull/37378
1425 [37389]: https://github.com/rust-lang/rust/pull/37389
1426 [37392]: https://github.com/rust-lang/rust/pull/37392
1427 [37427]: https://github.com/rust-lang/rust/pull/37427
1428 [37439]: https://github.com/rust-lang/rust/pull/37439
1429 [37445]: https://github.com/rust-lang/rust/pull/37445
1430 [37470]: https://github.com/rust-lang/rust/pull/37470
1431 [37569]: https://github.com/rust-lang/rust/pull/37569
1432 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
1433 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
1434 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
1435 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
1436 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
1437 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
1438 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
1441 Version 1.13.0 (2016-11-10)
1442 ===========================
1447 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
1448 errors, like the `try!` macro, described in [RFC 0243].
1449 * [Stabilize macros in type position][36014]. Described in [RFC 873].
1450 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
1451 * [Fix `#[derive]` for empty tuple structs/variants][35728]
1452 * [Fix lifetime rules for 'if' conditions][36029]
1453 * [Avoid loading and parsing unconfigured non-inline modules][36482]
1458 * [Add the `-C link-arg` argument][36574]
1459 * [Remove the old AST-based backend from rustc_trans][35764]
1460 * [Don't enable NEON by default on armv7 Linux][35814]
1461 * [Fix debug line number info for macro expansions][35238]
1462 * [Do not emit "class method" debuginfo for types that are not
1463 DICompositeType][36008]
1464 * [Warn about multiple conflicting #[repr] hints][34623]
1465 * [When sizing DST, don't double-count nested struct prefixes][36351]
1466 * [Default RUST_MIN_STACK to 16MiB for now][36505]
1467 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
1468 * [Reject macros with empty repetitions to avoid infinite loop][36721]
1469 * [Expand macros without recursing to avoid stack overflows][36214]
1474 * [Replace macro backtraces with labeled local uses][35702]
1475 * [Improve error message for missplaced doc comments][33922]
1476 * [Buffer unix and lock windows to prevent message interleaving][35975]
1477 * [Update lifetime errors to specifically note temporaries][36171]
1478 * [Special case a few colors for Windows][36178]
1479 * [Suggest `use self` when such an import resolves][36289]
1480 * [Be more specific when type parameter shadows primitive type][36338]
1481 * Many minor improvements
1483 Compile-time Optimizations
1484 --------------------------
1486 * [Compute and cache HIR hashes at beginning][35854]
1487 * [Don't hash types in loan paths][36004]
1488 * [Cache projections in trans][35761]
1489 * [Optimize the parser's last token handling][36527]
1490 * [Only instantiate #[inline] functions in codegen units referencing
1491 them][36524]. This leads to big improvements in cases where crates export
1492 define many inline functions without using them directly.
1493 * [Lazily allocate TypedArena's first chunk][36592]
1494 * [Don't allocate during default HashSet creation][36734]
1501 * [`overflowing_abs`]
1502 * [`RefCell::try_borrow`]
1503 * [`RefCell::try_borrow_mut`]
1508 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
1509 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
1511 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
1512 * [Implement `Debug` for `std::vec::IntoIter`][35707]
1513 * [`CString`: avoid excessive growth just to 0-terminate][35871]
1514 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
1515 * [Use arc4rand on FreeBSD][35884]
1516 * [memrchr: Correct aligned offset computation][35969]
1517 * [Improve Demangling of Rust Symbols][36059]
1518 * [Use monotonic time in condition variables][35048]
1519 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
1520 * [Implement conversion traits for `char`][35755]
1521 * [Fix illegal instruction caused by overflow in channel cloning][36104]
1522 * [Zero first byte of CString on drop][36264]
1523 * [Inherit overflow checks for sum and product][36372]
1524 * [Add missing Eq implementations][36423]
1525 * [Implement `Debug` for `DirEntry`][36631]
1526 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
1528 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
1529 * [Implement more traits for `std::io::ErrorKind`][35911]
1530 * [Optimize BinaryHeap bounds checking][36072]
1531 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
1532 `extend_with_element`][36355]
1533 * [Fix overflow checking in unsigned pow()][34942]
1538 * This release includes security fixes to both curl and OpenSSL.
1539 * [Fix transitive doctests when panic=abort][cargo/3021]
1540 * [Add --all-features flag to cargo][cargo/3038]
1541 * [Reject path-based dependencies in `cargo package`][cargo/3060]
1542 * [Don't parse the home directory more than once][cargo/3078]
1543 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
1544 * [Update OpenSSL to 1.0.2j][cargo/3121]
1545 * [Add license and license_file to cargo metadata output][cargo/3110]
1546 * [Make crates-io registry URL optional in config; ignore all changes to
1547 source.crates-io][cargo/3089]
1548 * [Don't download dependencies from other platforms][cargo/3123]
1549 * [Build transitive dev-dependencies when needed][cargo/3125]
1550 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
1551 * [Avoid updating registry when adding existing deps][cargo/3144]
1552 * [Warn about path overrides that won't work][cargo/3136]
1553 * [Use workspaces during `cargo install`][cargo/3146]
1554 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
1555 * [Add --message-format flag][cargo/3000]
1556 * [Pass target environment for rustdoc][cargo/3205]
1557 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
1558 * [Update curl and curl-sys][cargo/3241]
1559 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
1564 * [rustdoc: Add the `--sysroot` argument][36586]
1565 * [rustdoc: Fix a couple of issues with the search results][35655]
1566 * [rustdoc: remove the `!` from macro URLs and titles][35234]
1567 * [gdb: Fix pretty-printing special-cased Rust types][35585]
1568 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
1573 * [Remove unmaintained style guide][35124]
1574 * [Add s390x support][36369]
1575 * [Initial work at Haiku OS support][36727]
1576 * [Add mips-uclibc targets][35734]
1577 * [Crate-ify compiler-rt into compiler-builtins][35021]
1578 * [Add rustc version info (git hash + date) to dist tarball][36213]
1579 * Many documentation improvements
1584 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
1585 * [Deny (by default) transmuting from fn item types to pointer-sized
1586 types][34923]. Continuing the long transition to zero-sized fn items,
1588 * [Fix `#[derive]` for empty tuple structs/variants][35728].
1590 * [Issue deprecation warnings for safe accesses to extern statics][36173]
1591 * [Fix lifetime rules for 'if' conditions][36029].
1592 * [Inherit overflow checks for sum and product][36372].
1593 * [Forbid user-defined macros named "macro_rules"][36730].
1595 [33922]: https://github.com/rust-lang/rust/pull/33922
1596 [34623]: https://github.com/rust-lang/rust/pull/34623
1597 [34923]: https://github.com/rust-lang/rust/pull/34923
1598 [34942]: https://github.com/rust-lang/rust/pull/34942
1599 [34982]: https://github.com/rust-lang/rust/pull/34982
1600 [35021]: https://github.com/rust-lang/rust/pull/35021
1601 [35048]: https://github.com/rust-lang/rust/pull/35048
1602 [35074]: https://github.com/rust-lang/rust/pull/35074
1603 [35124]: https://github.com/rust-lang/rust/pull/35124
1604 [35234]: https://github.com/rust-lang/rust/pull/35234
1605 [35238]: https://github.com/rust-lang/rust/pull/35238
1606 [35354]: https://github.com/rust-lang/rust/pull/35354
1607 [35559]: https://github.com/rust-lang/rust/pull/35559
1608 [35585]: https://github.com/rust-lang/rust/pull/35585
1609 [35627]: https://github.com/rust-lang/rust/pull/35627
1610 [35655]: https://github.com/rust-lang/rust/pull/35655
1611 [35702]: https://github.com/rust-lang/rust/pull/35702
1612 [35707]: https://github.com/rust-lang/rust/pull/35707
1613 [35728]: https://github.com/rust-lang/rust/pull/35728
1614 [35734]: https://github.com/rust-lang/rust/pull/35734
1615 [35755]: https://github.com/rust-lang/rust/pull/35755
1616 [35761]: https://github.com/rust-lang/rust/pull/35761
1617 [35764]: https://github.com/rust-lang/rust/pull/35764
1618 [35814]: https://github.com/rust-lang/rust/pull/35814
1619 [35854]: https://github.com/rust-lang/rust/pull/35854
1620 [35871]: https://github.com/rust-lang/rust/pull/35871
1621 [35884]: https://github.com/rust-lang/rust/pull/35884
1622 [35911]: https://github.com/rust-lang/rust/pull/35911
1623 [35969]: https://github.com/rust-lang/rust/pull/35969
1624 [35975]: https://github.com/rust-lang/rust/pull/35975
1625 [36004]: https://github.com/rust-lang/rust/pull/36004
1626 [36008]: https://github.com/rust-lang/rust/pull/36008
1627 [36014]: https://github.com/rust-lang/rust/pull/36014
1628 [36029]: https://github.com/rust-lang/rust/pull/36029
1629 [36059]: https://github.com/rust-lang/rust/pull/36059
1630 [36072]: https://github.com/rust-lang/rust/pull/36072
1631 [36101]: https://github.com/rust-lang/rust/pull/36101
1632 [36104]: https://github.com/rust-lang/rust/pull/36104
1633 [36171]: https://github.com/rust-lang/rust/pull/36171
1634 [36173]: https://github.com/rust-lang/rust/pull/36173
1635 [36178]: https://github.com/rust-lang/rust/pull/36178
1636 [36213]: https://github.com/rust-lang/rust/pull/36213
1637 [36214]: https://github.com/rust-lang/rust/pull/36214
1638 [36264]: https://github.com/rust-lang/rust/pull/36264
1639 [36266]: https://github.com/rust-lang/rust/pull/36266
1640 [36289]: https://github.com/rust-lang/rust/pull/36289
1641 [36338]: https://github.com/rust-lang/rust/pull/36338
1642 [36351]: https://github.com/rust-lang/rust/pull/36351
1643 [36355]: https://github.com/rust-lang/rust/pull/36355
1644 [36369]: https://github.com/rust-lang/rust/pull/36369
1645 [36372]: https://github.com/rust-lang/rust/pull/36372
1646 [36423]: https://github.com/rust-lang/rust/pull/36423
1647 [36482]: https://github.com/rust-lang/rust/pull/36482
1648 [36505]: https://github.com/rust-lang/rust/pull/36505
1649 [36524]: https://github.com/rust-lang/rust/pull/36524
1650 [36527]: https://github.com/rust-lang/rust/pull/36527
1651 [36551]: https://github.com/rust-lang/rust/pull/36551
1652 [36574]: https://github.com/rust-lang/rust/pull/36574
1653 [36586]: https://github.com/rust-lang/rust/pull/36586
1654 [36592]: https://github.com/rust-lang/rust/pull/36592
1655 [36631]: https://github.com/rust-lang/rust/pull/36631
1656 [36639]: https://github.com/rust-lang/rust/pull/36639
1657 [36721]: https://github.com/rust-lang/rust/pull/36721
1658 [36727]: https://github.com/rust-lang/rust/pull/36727
1659 [36730]: https://github.com/rust-lang/rust/pull/36730
1660 [36734]: https://github.com/rust-lang/rust/pull/36734
1661 [36754]: https://github.com/rust-lang/rust/pull/36754
1662 [36995]: https://github.com/rust-lang/rust/pull/36995
1663 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
1664 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
1665 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
1666 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
1667 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
1668 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
1669 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
1670 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
1671 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
1672 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
1673 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
1674 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
1675 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
1676 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
1677 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
1678 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
1679 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
1680 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
1681 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
1682 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
1683 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
1684 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
1685 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
1686 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
1687 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
1688 [rustup]: https://www.rustup.rs
1689 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
1690 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
1691 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
1692 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
1693 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
1694 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
1695 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
1698 Version 1.12.1 (2016-10-20)
1699 ===========================
1704 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
1705 * [Confusion with double negation and booleans][36856]
1706 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
1707 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
1708 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
1709 * [Corrupted memory after updated to 1.12][36936]
1710 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
1711 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
1712 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
1714 [36381]: https://github.com/rust-lang/rust/issues/36381
1715 [36856]: https://github.com/rust-lang/rust/issues/36856
1716 [36875]: https://github.com/rust-lang/rust/issues/36875
1717 [36924]: https://github.com/rust-lang/rust/issues/36924
1718 [36926]: https://github.com/rust-lang/rust/issues/36926
1719 [36936]: https://github.com/rust-lang/rust/issues/36936
1720 [37026]: https://github.com/rust-lang/rust/issues/37026
1721 [37112]: https://github.com/rust-lang/rust/issues/37112
1722 [37153]: https://github.com/rust-lang/rust/issues/37153
1725 Version 1.12.0 (2016-09-29)
1726 ===========================
1731 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
1732 This translation pass is far simpler than the previous AST->LLVM pass, and
1733 creates opportunities to perform new optimizations directly on the MIR. It
1734 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
1735 * [`rustc` presents a new, more readable error format, along with
1736 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
1737 Most common editors supporting Rust have been updated to work with it. It was
1738 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
1743 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
1744 This translation pass is far simpler than the previous AST->LLVM pass, and
1745 creates opportunities to perform new optimizations directly on the MIR. It
1746 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
1747 * [Print the Rust target name, not the LLVM target name, with
1748 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
1749 * [The computation of `TypeId` is correct in some cases where it was previously
1750 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
1751 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
1752 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
1753 `--print relocation-models`, and `--print code-models` print the available
1754 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
1755 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
1756 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
1757 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
1758 These targets produce statically-linked binaries. There are no binary release
1764 * [`rustc` presents a new, more readable error format, along with
1765 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
1766 Most common editors supporting Rust have been updated to work with it. It was
1767 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
1768 * [In error descriptions, references are now described in plain English,
1769 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
1770 * [In error type descriptions, unknown numeric types are named `{integer}` or
1771 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
1772 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
1777 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
1778 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
1779 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
1780 useful](https://github.com/rust-lang/rust/pull/34908)
1781 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
1782 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
1783 * [Semicolons are properly required as statement delimeters inside
1784 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
1785 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
1790 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
1791 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
1792 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
1793 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
1794 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
1795 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
1796 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
1797 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
1798 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
1799 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
1800 Both on Unix and Windows.
1801 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
1802 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
1803 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
1804 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
1805 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
1806 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
1807 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
1808 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
1813 * [The `format!` macro and friends now allow a single argument to be formatted
1814 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
1815 * [The lifetime bounds on `[T]::binary_search_by` and
1816 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
1817 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
1818 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
1819 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
1820 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
1821 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
1822 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
1823 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
1824 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
1825 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
1826 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
1827 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
1828 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
1829 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
1830 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
1831 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
1832 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
1833 * [`mpsc::sync_channel` `Receiver`s return any available message before
1834 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
1835 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
1836 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
1841 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
1842 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
1843 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
1844 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
1845 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
1846 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
1847 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
1848 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
1849 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
1850 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
1851 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
1852 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
1853 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
1854 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
1855 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
1856 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
1861 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
1862 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
1867 * [Test binaries now support a `--test-threads` argument to specify the number
1868 of threads used to run tests, and which acts the same as the
1869 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
1870 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
1871 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
1872 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
1873 * [Rust releases now come with source packages that can be installed by rustup
1874 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
1875 The resulting source code can be used by tools and IDES, located in the
1876 sysroot under `lib/rustlib/src`.
1881 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
1882 * Many minor improvements to the documentation.
1883 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
1888 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
1889 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
1890 * [When formatting strings, if "precision" is specified, the "fill",
1891 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
1892 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
1895 Version 1.11.0 (2016-08-18)
1896 ===========================
1901 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
1902 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
1903 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
1904 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
1905 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
1910 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
1911 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
1912 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
1913 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
1914 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
1915 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
1916 (in libcore - previously stabilized in libstd)
1917 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
1918 (in libcore - previously stabilized in libstd)
1919 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
1920 (in libcore - previously stabilized in libstd)
1921 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
1922 (in libcore - previously stabilized in libstd)
1923 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
1924 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
1925 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
1926 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
1931 * [The `thread_local!` macro supports multiple definitions in a single
1932 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
1933 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
1934 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
1935 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
1936 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
1937 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
1938 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
1939 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
1944 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
1945 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
1946 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
1947 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
1948 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
1949 and `-vv` prints warnings for all crates.
1950 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
1951 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
1952 This provides room for expansion by arbitrary tools.
1953 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
1954 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
1955 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
1956 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
1957 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
1958 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
1959 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
1964 * [Caching projections speeds up type check dramatically for some
1965 workloads](https://github.com/rust-lang/rust/pull/33816)
1966 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
1967 This hasher is faster, but is believed to provide sufficient
1968 protection from collision attacks.
1969 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
1974 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
1975 * [Fix inlined renamed reexports in import lists](https://github.com/rust-lang/rust/pull/34479)
1976 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
1977 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
1978 * [Fix redirect pages for renamed reexports](https://github.com/rust-lang/rust/pull/34245)
1983 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
1984 * [When emitting debug info, rustc emits frame pointers for closures,
1985 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
1986 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
1987 * Many more errors have been given error codes and extended
1989 * API documentation continues to be improved, with many new examples
1994 * [rustc no longer hangs when dependencies recursively re-export
1995 submodules](https://github.com/rust-lang/rust/pull/34542)
1996 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
1997 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
1998 rewritten](https://github.com/rust-lang/rust/pull/33895)
1999 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
2000 No targets use this yet, but it works toward AVR support.
2005 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
2006 * [The new follow-set rules that place restrictions on `macro_rules!`
2007 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
2008 This was an [ammendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
2009 and has been a warning since 1.10.
2010 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
2011 This causes breakage in some corner cases.
2014 Version 1.10.0 (2016-07-07)
2015 ===========================
2020 * [Allow `concat_idents!` in type positions as well as in expression
2021 positions](https://github.com/rust-lang/rust/pull/33735).
2022 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
2023 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
2024 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
2025 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
2026 * [`panic!` can be converted to a runtime abort with the
2027 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
2028 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2029 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
2030 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
2031 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-rdylib.md).
2032 Note that Cargo does not yet directly support cdylibs.
2037 * `os::windows::fs::OpenOptionsExt::access_mode`
2038 * `os::windows::fs::OpenOptionsExt::share_mode`
2039 * `os::windows::fs::OpenOptionsExt::custom_flags`
2040 * `os::windows::fs::OpenOptionsExt::attributes`
2041 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
2042 * `os::unix::fs::OpenOptionsExt::custom_flags`
2043 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
2044 * `Default for sync::Weak`
2045 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
2046 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
2047 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
2048 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
2049 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
2050 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
2051 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
2052 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
2053 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
2054 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
2055 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
2056 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
2057 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
2058 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
2059 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
2060 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
2061 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
2062 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
2063 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
2064 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
2065 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
2066 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
2067 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
2068 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
2069 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
2070 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2071 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2072 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
2073 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
2074 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
2075 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
2076 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
2077 * Read/Write/RawFd impls for `UnixStream`
2078 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
2079 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
2080 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
2081 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
2082 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
2083 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
2084 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
2085 * RawFd impls for `UnixListener`
2086 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
2087 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
2088 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
2089 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
2090 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
2091 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
2092 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
2093 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
2094 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
2095 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
2096 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
2097 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
2098 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
2099 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
2100 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
2101 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
2102 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
2103 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
2104 * RawFd impls for `UnixDatagram`
2105 * `{BTree,Hash}Map::values_mut`
2106 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/beta/std/primitive.slice.html#method.binary_search_by_key)
2111 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
2112 The semantics of this minor method are subtle and probably not what
2114 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
2115 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
2116 will fall back to `/dev/urandom` temporarily to avoid blocking
2117 during early boot](https://github.com/rust-lang/rust/pull/33086).
2118 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
2119 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
2120 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
2121 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
2122 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
2123 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
2124 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
2128 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
2129 This controls the runtime behavior of the `panic!` macro
2130 and can be either "unwind" (the default), or "abort".
2131 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
2132 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
2133 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
2134 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
2135 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
2136 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
2137 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
2138 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
2139 By default they are retried twice, which can be customized with the
2140 `net.retry` value in `.cargo/config`.
2141 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
2142 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
2143 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
2144 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
2145 Makes it possible to install multiple crates in parallel.
2146 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
2147 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
2148 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
2149 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
2150 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
2151 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
2156 * [rustc memory usage was reduced by refactoring the context used for
2157 type checking](https://github.com/rust-lang/rust/pull/33425).
2158 * [Speed up creation of `HashMap`s by caching the random keys used
2159 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
2160 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
2161 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
2162 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
2163 10x faster than the previous lookup tables.
2164 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
2169 * Many incremental improvements to documentation and rustdoc.
2170 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
2171 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
2172 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
2173 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
2174 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
2175 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
2176 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
2181 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
2182 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
2183 * [`std` no longer prints backtraces on platforms where the running
2184 module must be loaded with `env::current_exe`, which can't be relied
2185 on](https://github.com/rust-lang/rust/pull/33554).
2186 * This release includes std binaries for the i586-unknown-linux-gnu,
2187 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
2188 i586 target is for old x86 hardware without SSE2, and the armv7
2189 target is for Android running on modern ARM architectures.
2190 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
2191 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
2192 * [On Unix the runtime aborts by calling `libc::abort` instead of
2193 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
2194 * [Rust is now bootstrapped from the previous release of Rust,
2195 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
2200 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
2201 * [`target_env` for Linux ARM targets is just `gnu`, not
2202 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
2203 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
2204 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
2205 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
2206 Affects how macros are parsed.
2207 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
2208 * [Feature-gated attributes on macro-generated macro invocations are
2209 now rejected](https://github.com/rust-lang/rust/pull/32791).
2210 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
2211 This caused some minor changes to type inference.
2214 Version 1.9.0 (2016-05-26)
2215 ==========================
2220 * The `#[deprecated]` attribute when applied to an API will generate
2221 warnings when used. The warnings may be suppressed with
2222 `#[allow(deprecated)]`. [RFC 1270].
2223 * [`fn` item types are zero sized, and each `fn` names a unique
2224 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2225 `transmute` on a `fn` type will generate a warning for a few cycles,
2226 then will be converted to an error.
2227 * [Field and method resolution understand visibility, so private
2228 fields and methods cannot prevent the proper use of public fields
2229 and methods][1.9fv].
2230 * [The parser considers unicode codepoints in the
2231 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
2237 * [`std::panic::catch_unwind`][] (renamed from `recover`)
2238 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
2239 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
2240 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
2241 * [`str::is_char_boundary`]
2242 * [`<*const T>::as_ref`]
2243 * [`<*mut T>::as_ref`]
2244 * [`<*mut T>::as_mut`]
2245 * [`AsciiExt::make_ascii_uppercase`]
2246 * [`AsciiExt::make_ascii_lowercase`]
2247 * [`char::decode_utf16`]
2248 * [`char::DecodeUtf16`]
2249 * [`char::DecodeUtf16Error`]
2250 * [`char::DecodeUtf16Error::unpaired_surrogate`]
2251 * [`BTreeSet::take`]
2252 * [`BTreeSet::replace`]
2255 * [`HashSet::replace`]
2257 * [`OsString::with_capacity`]
2258 * [`OsString::clear`]
2259 * [`OsString::capacity`]
2260 * [`OsString::reserve`]
2261 * [`OsString::reserve_exact`]
2262 * [`OsStr::is_empty`]
2264 * [`std::os::unix::thread`]
2267 * [`JoinHandleExt::as_pthread_t`]
2268 * [`JoinHandleExt::into_pthread_t`]
2269 * [`HashSet::hasher`]
2270 * [`HashMap::hasher`]
2271 * [`CommandExt::exec`]
2272 * [`File::try_clone`]
2273 * [`SocketAddr::set_ip`]
2274 * [`SocketAddr::set_port`]
2275 * [`SocketAddrV4::set_ip`]
2276 * [`SocketAddrV4::set_port`]
2277 * [`SocketAddrV6::set_ip`]
2278 * [`SocketAddrV6::set_port`]
2279 * [`SocketAddrV6::set_flowinfo`]
2280 * [`SocketAddrV6::set_scope_id`]
2281 * [`slice::copy_from_slice`]
2282 * [`ptr::read_volatile`]
2283 * [`ptr::write_volatile`]
2284 * [`OpenOptions::create_new`]
2285 * [`TcpStream::set_nodelay`]
2286 * [`TcpStream::nodelay`]
2287 * [`TcpStream::set_ttl`]
2288 * [`TcpStream::ttl`]
2289 * [`TcpStream::set_only_v6`]
2290 * [`TcpStream::only_v6`]
2291 * [`TcpStream::take_error`]
2292 * [`TcpStream::set_nonblocking`]
2293 * [`TcpListener::set_ttl`]
2294 * [`TcpListener::ttl`]
2295 * [`TcpListener::set_only_v6`]
2296 * [`TcpListener::only_v6`]
2297 * [`TcpListener::take_error`]
2298 * [`TcpListener::set_nonblocking`]
2299 * [`UdpSocket::set_broadcast`]
2300 * [`UdpSocket::broadcast`]
2301 * [`UdpSocket::set_multicast_loop_v4`]
2302 * [`UdpSocket::multicast_loop_v4`]
2303 * [`UdpSocket::set_multicast_ttl_v4`]
2304 * [`UdpSocket::multicast_ttl_v4`]
2305 * [`UdpSocket::set_multicast_loop_v6`]
2306 * [`UdpSocket::multicast_loop_v6`]
2307 * [`UdpSocket::set_multicast_ttl_v6`]
2308 * [`UdpSocket::multicast_ttl_v6`]
2309 * [`UdpSocket::set_ttl`]
2310 * [`UdpSocket::ttl`]
2311 * [`UdpSocket::set_only_v6`]
2312 * [`UdpSocket::only_v6`]
2313 * [`UdpSocket::join_multicast_v4`]
2314 * [`UdpSocket::join_multicast_v6`]
2315 * [`UdpSocket::leave_multicast_v4`]
2316 * [`UdpSocket::leave_multicast_v6`]
2317 * [`UdpSocket::take_error`]
2318 * [`UdpSocket::connect`]
2319 * [`UdpSocket::send`]
2320 * [`UdpSocket::recv`]
2321 * [`UdpSocket::set_nonblocking`]
2326 * [`std::sync::Once` is poisoned if its initialization function
2328 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
2329 * [Most types implement `fmt::Debug`][1.9db].
2330 * [The default buffer size used by `BufReader` and `BufWriter` was
2331 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
2332 used by other languages.
2333 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
2334 `Duration` additionally implements `*=` and `/=`][1.9ta].
2335 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
2336 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
2337 * [`Chain` implements `BufRead`][1.9ch].
2338 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
2343 * [Cargo can now run concurrently][1.9cc].
2344 * [Top-level overrides allow specific revisions of crates to be
2345 overridden through the entire crate graph][1.9ct]. This is intended
2346 to make upgrades easier for large projects, by allowing crates to be
2347 forked temporarily until they've been upgraded and republished.
2348 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
2349 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
2350 on the commandline][1.9cf]. `rustc` arguments can also be specified
2351 in the `build.rustflags` configuration key.
2356 * [The time complexity of comparing variables for equivalence during type
2357 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
2358 to major compilation time improvement in some scenarios.
2359 * [`ToString` is specialized for `str`, giving it the same performance
2360 as `to_owned`][1.9ts].
2361 * [Spawning processes with `Command::output` no longer creates extra
2363 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
2364 for C-like enums][1.9cl].
2369 * [Passing the `--quiet` flag to a test runner will produce
2370 much-abbreviated output][1.9q].
2371 * The Rust Project now publishes std binaries for the
2372 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
2373 `i586-pc-windows-msvc` targets.
2378 * [`std::sync::Once` is poisoned if its initialization function
2380 * [It is illegal to define methods with the same name in overlapping
2381 inherent `impl` blocks][1.9sn].
2382 * [`fn` item types are zero sized, and each `fn` names a unique
2383 type][1.9fn]. This will break code that transmutes `fn`s, so calling
2384 `transmute` on a `fn` type will generate a warning for a few cycles,
2385 then will be converted to an error.
2386 * [Improvements to const evaluation may trigger new errors when integer
2387 literals are out of range][1.9ce].
2390 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
2391 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
2392 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
2393 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
2394 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
2395 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
2396 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
2397 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
2398 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
2399 [1.9db]: https://github.com/rust-lang/rust/pull/32054
2400 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
2401 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
2402 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
2403 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
2404 [1.9o]: https://github.com/rust-lang/rust/pull/32325
2405 [1.9q]: https://github.com/rust-lang/rust/pull/31887
2406 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
2407 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
2408 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
2409 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
2410 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
2411 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
2412 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
2413 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
2414 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2415 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
2416 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
2417 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
2418 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
2419 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
2420 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
2421 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
2422 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
2423 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
2424 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
2425 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
2426 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
2427 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
2428 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
2429 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
2430 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
2431 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
2432 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
2433 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
2434 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
2435 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
2436 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
2437 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
2438 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
2439 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
2440 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
2441 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
2442 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
2443 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
2444 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
2445 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
2446 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
2447 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
2448 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
2449 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
2450 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2451 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2452 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2453 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2454 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2455 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2456 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
2457 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
2458 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
2459 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
2460 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
2461 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
2462 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
2463 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
2464 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
2465 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
2466 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
2467 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
2468 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
2469 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
2470 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
2471 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
2472 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
2473 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
2474 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
2475 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
2476 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
2477 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
2478 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
2479 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
2480 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
2481 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
2482 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
2483 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
2484 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
2485 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
2486 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
2487 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
2488 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
2489 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
2490 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
2491 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
2492 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
2493 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
2494 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
2495 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
2496 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
2497 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
2498 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
2499 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
2502 Version 1.8.0 (2016-04-14)
2503 ==========================
2508 * Rust supports overloading of compound assignment statements like
2509 `+=` by implementing the [`AddAssign`], [`SubAssign`],
2510 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
2511 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
2513 * Empty structs can be defined with braces, as in `struct Foo { }`, in
2514 addition to the non-braced form, `struct Foo;`. [RFC 218].
2520 * [`str::encode_utf16`][] (renamed from `utf16_units`)
2521 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
2524 * [`ptr::drop_in_place`]
2526 * [`time::SystemTime`]
2528 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
2529 * [`Instant::elapsed`]
2530 * [`SystemTime::now`]
2531 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
2532 * [`SystemTime::elapsed`]
2533 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
2534 * [`SystemTimeError`]
2535 * [`SystemTimeError::duration`]
2536 * Various impls for `SystemTimeError`
2538 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
2539 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
2540 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
2541 * [The `write!` and `writeln!` macros correctly emit errors if any of
2542 their arguments can't be formatted][1.8w].
2543 * [Various I/O functions support large files on 32-bit Linux][1.8l].
2544 * [The Unix-specific `raw` modules, which contain a number of
2545 redefined C types are deprecated][1.8r], including `os::raw::unix`,
2546 `os::raw::macos`, and `os::raw::linux`. These modules defined types
2547 such as `ino_t` and `dev_t`. The inconsistency of these definitions
2548 across platforms was making it difficult to implement `std`
2549 correctly. Those that need these definitions should use the `libc`
2551 * The Unix-specific `MetadataExt` traits, including
2552 `os::unix::fs::MetadataExt`, which expose values such as inode
2553 numbers [no longer return platform-specific types][1.8r], but
2554 instead return widened integers. [RFC 1415].
2555 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
2556 * [Atomic loads and stores are not volatile][1.8a].
2557 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
2562 * [Inlining hash functions lead to a 3% compile-time improvement in
2563 some workloads][1.8h].
2564 * When using jemalloc, its symbols are [unprefixed so that it
2565 overrides the libc malloc implementation][1.8h]. This means that for
2566 rustc, LLVM is now using jemalloc, which results in a 6%
2567 compile-time improvement on a specific workload.
2568 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
2573 * [32-bit MSVC builds finally implement unwinding][1.8ms].
2574 i686-pc-windows-msvc is now considered a tier-1 platform.
2575 * [The `--print targets` flag prints a list of supported targets][1.8t].
2576 * [The `--print cfg` flag prints the `cfg`s defined for the current
2578 * [`rustc` can be built with an new Cargo-based build system, written
2579 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
2580 build system. To enable it configure with `configure --rustbuild`.
2581 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
2582 variants while also indicating the total number of missing variants
2583 if more than 3][1.8m].
2584 * [Executable stacks are disabled on Linux and BSD][1.8nx].
2585 * The Rust Project now publishes binary releases of the standard
2586 library for a number of tier-2 targets:
2587 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
2588 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
2589 `x86_64-rumprun-netbsd`. These can be installed with
2590 tools such as [multirust][1.8mr].
2595 * [`cargo init` creates a new Cargo project in the current
2596 directory][1.8ci]. It is otherwise like `cargo new`.
2597 * [Cargo has configuration keys for `-v` and
2598 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
2599 `[term]` section of `.cargo/config`.
2600 * [Configuration keys that evaluate to strings or integers can be set
2601 via environment variables][1.8ce]. For example the `build.jobs` key
2602 can be set via `CARGO_BUILD_JOBS`. Environment variables take
2603 precedence over config files.
2604 * [Target-specific dependencies support Rust `cfg` syntax for
2605 describing targets][1.8cfg] so that dependencies for multiple
2606 targets can be specified together. [RFC 1361].
2607 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
2608 `RUSTDOC` take precedence over the `build.target-dir`,
2609 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
2610 * [The child process tree is killed on Windows when Cargo is
2612 * [The `build.target` configuration value sets the target platform,
2613 like `--target`][1.8ct].
2618 * [Unstable compiler flags have been further restricted][1.8u]. Since
2619 1.0 `-Z` flags have been considered unstable, and other flags that
2620 were considered unstable additionally required passing `-Z
2621 unstable-options` to access. Unlike unstable language and library
2622 features though, these options have been accessible on the stable
2623 release channel. Going forward, *new unstable flags will not be
2624 available on the stable release channel*, and old unstable flags
2625 will warn about their usage. In the future, all unstable flags will
2626 be unavailable on the stable release channel.
2627 * [It is no longer possible to `match` on empty enum variants using
2628 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
2629 * The Unix-specific `MetadataExt` traits, including
2630 `os::unix::fs::MetadataExt`, which expose values such as inode
2631 numbers [no longer return platform-specific types][1.8r], but
2632 instead return widened integers. [RFC 1415].
2633 * [Modules sourced from the filesystem cannot appear within arbitrary
2634 blocks, but only within other modules][1.8mf].
2635 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
2636 * On Unix, [stack overflow triggers a runtime abort instead of a
2638 * [`Command::spawn` and its equivalents return an error if any of
2639 its command-line arguments contain interior `NUL`s][1.8n].
2640 * [Tuple and unit enum variants from other crates are in the type
2642 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
2643 type instead of `.a` files][1.8st]. Additionally, for the MSVC
2644 toolchain, `rustc` emits import libraries named `foo.dll.lib`
2645 instead of `foo.lib`.
2648 [1.8a]: https://github.com/rust-lang/rust/pull/30962
2649 [1.8b]: https://github.com/rust-lang/rust/pull/31123
2650 [1.8c]: https://github.com/rust-lang/rust/pull/31530
2651 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
2652 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
2653 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
2654 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
2655 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
2656 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
2657 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
2658 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
2659 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
2660 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
2661 [1.8h]: https://github.com/rust-lang/rust/pull/31460
2662 [1.8l]: https://github.com/rust-lang/rust/pull/31668
2663 [1.8m]: https://github.com/rust-lang/rust/pull/31020
2664 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
2665 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
2666 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
2667 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
2668 [1.8n]: https://github.com/rust-lang/rust/pull/31056
2669 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
2670 [1.8r]: https://github.com/rust-lang/rust/pull/31551
2671 [1.8so]: https://github.com/rust-lang/rust/pull/31333
2672 [1.8st]: https://github.com/rust-lang/rust/pull/29520
2673 [1.8t]: https://github.com/rust-lang/rust/pull/31358
2674 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
2675 [1.8u]: https://github.com/rust-lang/rust/pull/31793
2676 [1.8v]: https://github.com/rust-lang/rust/pull/31757
2677 [1.8w]: https://github.com/rust-lang/rust/pull/31904
2678 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
2679 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
2680 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
2681 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
2682 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
2683 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
2684 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
2685 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
2686 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
2687 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
2688 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
2689 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
2690 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
2691 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
2692 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
2693 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
2694 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
2695 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
2696 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
2697 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
2698 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
2699 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
2700 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
2701 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
2702 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
2703 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
2704 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
2705 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
2706 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
2707 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
2710 Version 1.7.0 (2016-03-03)
2711 ==========================
2718 * [`Path::strip_prefix`][] (renamed from relative_from)
2719 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
2721 * [`Ipv4Addr::is_loopback`]
2722 * [`Ipv4Addr::is_private`]
2723 * [`Ipv4Addr::is_link_local`]
2724 * [`Ipv4Addr::is_multicast`]
2725 * [`Ipv4Addr::is_broadcast`]
2726 * [`Ipv4Addr::is_documentation`]
2728 * [`Ipv6Addr::is_unspecified`]
2729 * [`Ipv6Addr::is_loopback`]
2730 * [`Ipv6Addr::is_multicast`]
2733 * [`Vec::as_mut_slice`]
2735 * [`String::as_str`]
2736 * [`String::as_mut_str`]
2738 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
2740 * `<[T]>::`[`sort_by_key`]
2741 * checked, saturated, and overflowing operations
2742 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
2743 * [`i32::saturating_mul`]
2744 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
2745 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
2746 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
2747 * [`u32::saturating_mul`]
2748 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
2749 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
2750 * and checked, saturated, and overflowing operations for other primitive types
2752 * [`ffi::IntoStringError`]
2753 * [`CString::into_string`]
2754 * [`CString::into_bytes`]
2755 * [`CString::into_bytes_with_nul`]
2756 * `From<CString> for Vec<u8>`
2758 * [`IntoStringError::into_cstring`]
2759 * [`IntoStringError::utf8_error`]
2760 * `Error for IntoStringError`
2762 * [`std::hash::BuildHasher`]
2763 * [`BuildHasher::Hasher`]
2764 * [`BuildHasher::build_hasher`]
2765 * [`std::hash::BuildHasherDefault`]
2766 * [`HashMap::with_hasher`]
2767 * [`HashMap::with_capacity_and_hasher`]
2768 * [`HashSet::with_hasher`]
2769 * [`HashSet::with_capacity_and_hasher`]
2770 * [`std::collections::hash_map::RandomState`]
2771 * [`RandomState::new`]
2772 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
2773 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
2774 from bytes is faster.
2775 * [The performance of `LineWriter` (and thus `io::stdout`) was
2776 improved by using `memchr` to search for newlines][1.7m].
2777 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
2778 `f64` variants were stabilized previously.
2779 * [`BTreeMap` was rewritten to use less memory and improve the performance
2780 of insertion and iteration, the latter by as much as 5x][1.7bm].
2781 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
2782 covariant over their contained type][1.7bt].
2783 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
2784 over their contained type][1.7ll].
2785 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
2787 * [`Any` is implemented for unsized types][1.7a].
2788 * [`Hash` is implemented for `Duration`][1.7h].
2793 * [When running tests with `--test`, rustdoc will pass `--cfg`
2794 arguments to the compiler][1.7dt].
2795 * [The compiler is built with RPATH information by default][1.7rpa].
2796 This means that it will be possible to run `rustc` when installed in
2797 unusual configurations without configuring the dynamic linker search
2799 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
2800 any RPATH entries (emitted with `-C rpath`) *not* take precedence
2801 over `LD_LIBRARY_PATH`.
2806 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
2807 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
2808 * [The `rerun-if-changed` build script directive no longer causes the
2809 build script to incorrectly run twice in certain scenarios][1.7rr].
2814 * Soundness fixes to the interactions between associated types and
2815 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
2816 code that violates the new rules. This is a significant change that
2817 is known to break existing code, so it has emitted warnings for the
2818 new error cases since 1.4 to give crate authors time to adapt. The
2819 details of what is changing are subtle; read the RFC for more.
2820 * [Several bugs in the compiler's visibility calculations were
2821 fixed][1.7v]. Since this was found to break significant amounts of
2822 code, the new errors will be emitted as warnings for several release
2823 cycles, under the `private_in_public` lint.
2824 * Defaulted type parameters were accidentally accepted in positions
2825 that were not intended. In this release, [defaulted type parameters
2826 appearing outside of type definitions will generate a
2827 warning][1.7d], which will become an error in future releases.
2828 * [Parsing "." as a float results in an error instead of 0][1.7p].
2829 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
2830 * [Borrows of closure parameters may not outlive the closure][1.7bc].
2832 [1.7a]: https://github.com/rust-lang/rust/pull/30928
2833 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
2834 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
2835 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
2836 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
2837 [1.7d]: https://github.com/rust-lang/rust/pull/30724
2838 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
2839 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
2840 [1.7f]: https://github.com/rust-lang/rust/pull/30672
2841 [1.7h]: https://github.com/rust-lang/rust/pull/30818
2842 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
2843 [1.7m]: https://github.com/rust-lang/rust/pull/30381
2844 [1.7p]: https://github.com/rust-lang/rust/pull/30681
2845 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
2846 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
2847 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
2848 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
2849 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
2850 [1.7v]: https://github.com/rust-lang/rust/pull/29973
2851 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
2852 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
2853 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
2854 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
2855 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
2856 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
2857 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
2858 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
2859 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
2860 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
2861 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
2862 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
2863 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
2864 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
2865 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
2866 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
2867 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
2868 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
2869 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
2870 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
2871 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
2872 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
2873 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
2874 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
2875 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
2876 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
2877 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
2878 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
2879 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
2880 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
2881 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
2882 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
2883 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
2884 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
2885 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
2886 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
2887 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
2888 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
2889 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
2890 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
2891 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
2892 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
2893 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
2894 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
2895 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
2896 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
2897 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
2898 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
2899 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
2900 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
2901 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
2902 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
2903 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
2904 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
2905 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
2906 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
2907 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
2908 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
2909 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
2910 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
2913 Version 1.6.0 (2016-01-21)
2914 ==========================
2919 * The `#![no_std]` attribute causes a crate to not be linked to the
2920 standard library, but only the [core library][1.6co], as described
2921 in [RFC 1184]. The core library defines common types and traits but
2922 has no platform dependencies whatsoever, and is the basis for Rust
2923 software in environments that cannot support a full port of the
2924 standard library, such as operating systems. Most of the core
2925 library is now stable.
2931 [`Read::read_exact`],
2932 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
2933 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
2934 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
2935 [`os::unix::fs::DirBuilderExt`],
2936 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
2937 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
2938 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
2939 [`collections::hash_map::Drain`],
2940 [`collections::hash_map::HashMap::drain`],
2941 [`collections::hash_set::Drain`],
2942 [`collections::hash_set::HashSet::drain`],
2943 [`collections::binary_heap::Drain`],
2944 [`collections::binary_heap::BinaryHeap::drain`],
2945 [`Vec::extend_from_slice`][] (renamed from `push_all`),
2946 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
2947 [`RwLock::into_inner`],
2948 [`Iterator::min_by_key`][] (renamed from `min_by`),
2949 [`Iterator::max_by_key`][] (renamed from `max_by`).
2950 * The [core library][1.6co] is stable, as are most of its APIs.
2951 * [The `assert_eq!` macro supports arguments that don't implement
2952 `Sized`][1.6ae], such as arrays. In this way it behaves more like
2954 * Several timer functions that take duration in milliseconds [are
2955 deprecated in favor of those that take `Duration`][1.6ms]. These
2956 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
2957 `thread::park_timeout_ms`.
2958 * The algorithm by which `Vec` reserves additional elements was
2959 [tweaked to not allocate excessive space][1.6a] while still growing
2961 * `From` conversions are [implemented from integers to floats][1.6f]
2962 in cases where the conversion is lossless. Thus they are not
2963 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
2964 or `f64`. They are also not implemented for `isize` and `usize`
2965 because the implementations would be platform-specific. `From` is
2966 also implemented from `f32` to `f64`.
2967 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
2968 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
2969 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
2970 * [`BinaryHeap` was refactored][1.6bh] for modest performance
2972 * Sorting slices that are already sorted [is 50% faster in some
2978 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
2979 * Cargo build scripts can specify their dependencies by emitting the
2980 [`rerun-if-changed`][1.6rr] key.
2981 * crates.io will reject publication of crates with dependencies that
2982 have a wildcard version constraint. Crates with wildcard
2983 dependencies were seen to cause a variety of problems, as described
2984 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
2986 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
2987 release folder. A variety of artifacts that Cargo failed to clean
2988 are now correctly deleted.
2993 * The `unreachable_code` lint [warns when a function call's argument
2995 * The parser indicates [failures that may be caused by
2996 confusingly-similar Unicode characters][1.6uc]
2997 * Certain macro errors [are reported at definition time][1.6m], not
3003 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
3004 environment variable when locating crates. This was a pre-cargo
3005 feature for integrating with the package manager that was
3006 accidentally never removed.
3007 * [A number of bugs were fixed in the privacy checker][1.6p] that
3008 could cause previously-accepted code to break.
3009 * [Modules and unit/tuple structs may not share the same name][1.6ts].
3010 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
3011 struct pattern syntax (`Foo(..)`) can no longer be used to match
3012 unit structs. This is a warning now, but will become an error in
3013 future releases. Patterns that share the same name as a const are
3015 * A bug was fixed that causes [rustc not to apply default type
3016 parameters][1.6xc] when resolving certain method implementations of
3017 traits defined in other crates.
3019 [1.6a]: https://github.com/rust-lang/rust/pull/29454
3020 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
3021 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
3022 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
3023 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
3024 [1.6co]: http://doc.rust-lang.org/beta/core/index.html
3025 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
3026 [1.6f]: https://github.com/rust-lang/rust/pull/29129
3027 [1.6m]: https://github.com/rust-lang/rust/pull/29828
3028 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
3029 [1.6p]: https://github.com/rust-lang/rust/pull/29726
3030 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
3031 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
3032 [1.6s]: https://github.com/rust-lang/rust/pull/29675
3033 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
3034 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
3035 [1.6us]: https://github.com/rust-lang/rust/pull/29383
3036 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
3037 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
3038 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3039 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
3040 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
3041 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
3042 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
3043 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
3044 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
3045 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
3046 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
3047 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
3048 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
3049 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
3050 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
3051 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
3052 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
3053 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
3054 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
3055 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
3056 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
3057 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
3058 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
3059 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
3060 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
3061 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
3062 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
3063 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
3064 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
3065 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
3068 Version 1.5.0 (2015-12-10)
3069 ==========================
3071 * ~700 changes, numerous bugfixes
3077 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
3078 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
3079 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
3080 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
3081 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
3082 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
3083 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
3084 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
3085 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
3086 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
3087 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
3088 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
3089 [`Path::read_link`], [`Path::symlink_metadata`],
3090 [`Utf8Error::valid_up_to`], [`Vec::resize`],
3091 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
3092 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
3093 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
3094 [`slice::split_first_mut`], [`slice::split_first`],
3095 [`slice::split_last_mut`], [`slice::split_last`],
3096 [`char::from_u32_unchecked`], [`fs::canonicalize`],
3097 [`str::MatchIndices`], [`str::RMatchIndices`],
3098 [`str::match_indices`], [`str::rmatch_indices`],
3099 [`str::slice_mut_unchecked`], [`string::ParseError`].
3100 * Rust applications hosted on crates.io can be installed locally to
3101 `~/.cargo/bin` with the [`cargo install`] command. Among other
3102 things this makes it easier to augment Cargo with new subcommands:
3103 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
3104 invoked as `cargo foo`.
3105 * Crates with wildcard (`*`) dependencies will [emit warnings when
3106 published][1.5w]. In 1.6 it will no longer be possible to publish
3107 crates with wildcard dependencies.
3112 * The rules determining when a particular lifetime must outlive
3113 a particular value (known as '[dropck]') have been [modified
3114 to not rely on parametricity][1.5p].
3115 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
3116 and `Arc`][1.5a]. Because these smart pointer types implement
3117 `Deref`, this causes breakage in cases where the interior type
3118 contains methods of the same name.
3119 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
3120 that they could drop their content. Soundness fix.
3121 * All method invocations are [properly checked][1.5wf1] for
3122 [well-formedness][1.5wf2]. Soundness fix.
3123 * Traits whose supertraits contain `Self` are [not object
3124 safe][1.5o]. Soundness fix.
3125 * Target specifications support a [`no_default_libraries`][1.5nd]
3126 setting that controls whether `-nodefaultlibs` is passed to the
3127 linker, and in turn the `is_like_windows` setting no longer affects
3128 the `-nodefaultlibs` flag.
3129 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
3130 * The `#[inline]` and `#[repr]` attributes [can only appear
3131 in valid locations][1.5at].
3132 * Native libraries linked from the local crate are [passed to
3133 the linker before native libraries from upstream crates][1.5nl].
3134 * Two rarely-used attributes, `#[no_debug]` and
3135 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
3136 * Negation of unsigned integers, which has been a warning for
3137 several releases, [is now behind a feature gate and will
3138 generate errors][1.5nu].
3139 * The parser accidentally accepted visibility modifiers on
3140 enum variants, a bug [which has been fixed][1.5ev].
3141 * [A bug was fixed that allowed `use` statements to import unstable
3147 * When evaluating expressions at compile-time that are not
3148 compile-time constants (const-evaluating expressions in non-const
3149 contexts), incorrect code such as overlong bitshifts and arithmetic
3150 overflow will [generate a warning instead of an error][1.5ce],
3151 delaying the error until runtime. This will allow the
3152 const-evaluator to be expanded in the future backwards-compatibly.
3153 * The `improper_ctypes` lint [no longer warns about using `isize` and
3154 `usize` in FFI][1.5ict].
3159 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
3161 * `Default` is [implemented for mutable slices][1.5d].
3162 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
3163 * There are now `From` conversions [between floating point
3164 types][1.5f] where the conversions are lossless.
3165 * Thera are now `From` conversions [between integer types][1.5i] where
3166 the conversions are lossless.
3167 * [`fs::Metadata` implements `Clone`][1.5fs].
3168 * The `parse` method [accepts a leading "+" when parsing
3170 * [`AsMut` is implemented for `Vec`][1.5am].
3171 * The `clone_from` implementations for `String` and `BinaryHeap` [have
3172 been optimized][1.5cf] and no longer rely on the default impl.
3173 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
3174 `unsafe extern "C"` function types now [implement `Clone`,
3175 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
3176 `fmt::Debug` for up to 12 arguments][1.5fp].
3177 * [Dropping `Vec`s is much faster in unoptimized builds when the
3178 element types don't implement `Drop`][1.5dv].
3179 * A bug that caused in incorrect behavior when [combining `VecDeque`
3180 with zero-sized types][1.5vdz] was resolved.
3181 * [`PartialOrd` for slices is faster][1.5po].
3186 * [Crate metadata size was reduced by 20%][1.5md].
3187 * [Improvements to code generation reduced the size of libcore by 3.3
3188 MB and rustc's memory usage by 18MB][1.5m].
3189 * [Improvements to deref translation increased performance in
3190 unoptimized builds][1.5dr].
3191 * Various errors in trait resolution [are deduplicated to only be
3192 reported once][1.5te].
3193 * Rust has preliminary [support for rumprun kernels][1.5rr].
3194 * Rust has preliminary [support for NetBSD on amd64][1.5na].
3196 [1.5use]: https://github.com/rust-lang/rust/pull/28364
3197 [1.5po]: https://github.com/rust-lang/rust/pull/28436
3198 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
3199 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
3200 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
3201 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
3202 [1.5md]: https://github.com/rust-lang/rust/pull/28521
3203 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
3204 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
3205 [1.5na]: https://github.com/rust-lang/rust/pull/28543
3206 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
3207 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
3208 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
3209 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
3210 [1.5te]: https://github.com/rust-lang/rust/pull/28645
3211 [1.5at]: https://github.com/rust-lang/rust/pull/28650
3212 [1.5am]: https://github.com/rust-lang/rust/pull/28663
3213 [1.5m]: https://github.com/rust-lang/rust/pull/28778
3214 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
3215 [1.5a]: https://github.com/rust-lang/rust/pull/28811
3216 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
3217 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
3218 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
3219 [1.5i]: https://github.com/rust-lang/rust/pull/28921
3220 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
3221 [1.5f]: https://github.com/rust-lang/rust/pull/29129
3222 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
3223 [1.5s]: https://github.com/rust-lang/rust/pull/29190
3224 [1.5d]: https://github.com/rust-lang/rust/pull/29245
3225 [1.5o]: https://github.com/rust-lang/rust/pull/29259
3226 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
3227 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3228 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
3229 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
3230 [1.5c]: https://github.com/rust-lang/rust/pull/29110
3231 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
3232 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
3233 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
3234 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
3235 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
3236 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
3237 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
3238 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
3239 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
3240 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
3241 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
3242 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
3243 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
3244 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
3245 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
3246 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
3247 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
3248 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
3249 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
3250 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
3251 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
3252 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
3253 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
3254 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
3255 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
3256 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
3257 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
3258 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
3259 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
3260 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
3261 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
3262 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
3263 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
3264 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
3265 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
3266 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
3267 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
3268 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
3269 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
3270 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
3271 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
3272 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
3273 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
3274 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
3275 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
3276 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
3277 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
3278 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
3279 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
3280 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
3281 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
3282 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
3283 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
3284 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
3286 Version 1.4.0 (2015-10-29)
3287 ==========================
3289 * ~1200 changes, numerous bugfixes
3294 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
3295 GNU) are now supported and recommended for use.
3300 * [Several changes have been made to fix type soundness and improve
3301 the behavior of associated types][sound]. See [RFC 1214]. Although
3302 we have mostly introduced these changes as warnings this release, to
3303 become errors next release, there are still some scenarios that will
3304 see immediate breakage.
3305 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
3306 line breaks in addition to `\n`][crlf].
3307 * [Loans of `'static` lifetime extend to the end of a function][stat].
3308 * [`str::parse` no longer introduces avoidable rounding error when
3309 parsing floating point numbers. Together with earlier changes to
3310 float formatting/output, "round trips" like f.to_string().parse()
3311 now preserve the value of f exactly. Additionally, leading plus
3312 signs are now accepted][fp3].
3318 * `use` statements that import multiple items [can now rename
3319 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
3320 * [Binops work correctly on fat pointers][binfat].
3321 * `pub extern crate`, which does not behave as expected, [issues a
3322 warning][pec] until a better solution is found.
3327 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
3328 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
3329 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
3330 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
3331 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
3332 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
3333 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
3334 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
3335 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
3336 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
3337 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
3338 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
3339 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
3340 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
3341 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
3342 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
3343 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
3344 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
3346 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
3347 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
3348 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
3349 `f64::from_str_radix`.
3350 * [Reverse-searching strings is faster with the 'two-way'
3352 * [`std::io::copy` allows `?Sized` arguments][cc].
3353 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
3354 [override `count`, `nth` and `last` with an O(1)
3355 implementation][it].
3356 * [`Default` is implemented for arrays up to `[T; 32]`][d].
3357 * [`IntoRawFd` has been added to the Unix-specific prelude,
3358 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
3360 * [`Extend<String>` and `FromIterator<String` are both implemented for
3362 * [`IntoIterator` is implemented for references to `Option` and
3364 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
3365 Copy`][ext] as part of [RFC 839]. This will cause type inferance
3366 breakage in rare situations.
3367 * [`BinaryHeap` implements `Debug`][bh2].
3368 * [`Borrow` and `BorrowMut` are implemented for fixed-size
3370 * [`extern fn`s with the "Rust" and "C" ABIs implement common
3371 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
3372 * [String comparison is faster][faststr].
3373 * `&mut T` where `T: std::fmt::Write` [also implements
3374 `std::fmt::Write`][mutw].
3375 * [A stable regression in `VecDeque::push_back` and other
3376 capicity-altering methods that caused panics for zero-sized types
3378 * [Function pointers implement traits for up to 12 parameters][fp2].
3383 * The compiler [no longer uses the 'morestack' feature to prevent
3384 stack overflow][mm]. Instead it uses guard pages and stack
3385 probes (though stack probes are not yet implemented on any platform
3387 * [The compiler matches traits faster when projections are involved][p].
3388 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
3390 * [Cargo now displays useful information about what its doing during
3391 `cargo update`][cu].
3393 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
3394 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
3395 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
3396 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
3397 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
3398 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
3399 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
3400 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
3401 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
3402 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
3403 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
3404 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
3405 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
3406 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
3407 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
3408 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
3409 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
3410 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
3411 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3412 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3413 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3414 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3415 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
3416 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
3417 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
3418 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
3419 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
3420 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
3421 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
3422 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
3423 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
3424 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
3425 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
3426 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
3427 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
3428 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
3429 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
3430 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
3431 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
3432 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
3433 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
3434 [bh2]: https://github.com/rust-lang/rust/pull/28156
3435 [binfat]: https://github.com/rust-lang/rust/pull/28270
3436 [bm]: https://github.com/rust-lang/rust/pull/28197
3437 [cc]: https://github.com/rust-lang/rust/pull/27531
3438 [crlf]: https://github.com/rust-lang/rust/pull/28034
3439 [cu]: https://github.com/rust-lang/cargo/pull/1931
3440 [d]: https://github.com/rust-lang/rust/pull/27825
3441 [dep]: https://github.com/rust-lang/rust/pull/28339
3442 [es]: https://github.com/rust-lang/rust/pull/27956
3443 [ext]: https://github.com/rust-lang/rust/pull/28094
3444 [faststr]: https://github.com/rust-lang/rust/pull/28338
3445 [ffi]: https://github.com/rust-lang/rust/pull/28779
3446 [fp]: https://github.com/rust-lang/rust/pull/28268
3447 [fp2]: https://github.com/rust-lang/rust/pull/28560
3448 [fp3]: https://github.com/rust-lang/rust/pull/27307
3449 [i]: https://github.com/rust-lang/rust/pull/27451
3450 [into2]: https://github.com/rust-lang/rust/pull/28039
3451 [it]: https://github.com/rust-lang/rust/pull/27652
3452 [mm]: https://github.com/rust-lang/rust/pull/27338
3453 [mutw]: https://github.com/rust-lang/rust/pull/28368
3454 [sound]: https://github.com/rust-lang/rust/pull/27641
3455 [p]: https://github.com/rust-lang/rust/pull/27866
3456 [pec]: https://github.com/rust-lang/rust/pull/28486
3457 [pr]: https://github.com/rust-lang/rust/pull/27896
3458 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
3459 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
3460 [s]: https://github.com/rust-lang/rust/pull/27474
3461 [stab]: https://github.com/rust-lang/rust/pull/28339
3462 [stat]: https://github.com/rust-lang/rust/pull/28321
3463 [vd]: https://github.com/rust-lang/rust/pull/28494
3465 Version 1.3.0 (2015-09-17)
3466 ==============================
3468 * ~900 changes, numerous bugfixes
3473 * The [new object lifetime defaults][nold] have been [turned
3474 on][nold2] after a cycle of warnings about the change. Now types
3475 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
3476 being interpreted as `&'a Box<Trait+'a>` to `&'a
3477 Box<Trait+'static>`.
3478 * [The Rustonomicon][nom] is a new book in the official documentation
3479 that dives into writing unsafe Rust.
3480 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
3481 timekeeping is employed by other std APIs, as well as out-of-tree
3487 * The [new object lifetime defaults][nold] have been [turned
3488 on][nold2] after a cycle of warnings about the change.
3489 * There is a known [regression][lr] in how object lifetime elision is
3490 interpreted, the proper solution for which is undetermined.
3491 * The `#[prelude_import]` attribute, an internal implementation
3492 detail, was accidentally stabilized previously. [It has been put
3493 behind the `prelude_import` feature gate][pi]. This change is
3494 believed to break no existing code.
3495 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
3496 [more sane for dynamically sized types][dst3]. Code that relied on
3497 the previous behavior is thought to be broken.
3498 * The `dropck` rules, which checks that destructors can't access
3499 destroyed values, [have been updated][dropck] to match the
3500 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
3501 cause some previously-compiling code to no longer build.
3506 * The [new object lifetime defaults][nold] have been [turned
3507 on][nold2] after a cycle of warnings about the change.
3508 * Semicolons may [now follow types and paths in
3509 macros](https://github.com/rust-lang/rust/pull/27000).
3510 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
3511 [more sane for dynamically sized types][dst3]. Code that relied on
3512 the previous behavior is not known to exist, and suspected to be
3514 * `'static` variables [may now be recursive][st].
3515 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
3516 implementations correctly.
3517 * The `dropck` rules, which checks that destructors can't access
3518 destroyed values, [have been updated][dropck] to match the
3524 * The [`Duration`] API, [has been stabilized][ds], as well as the
3525 `std::time` module, which presently contains only `Duration`.
3526 * `Box<str>` and `Box<[T]>` both implement `Clone`.
3527 * The owned C string, [`CString`], implements [`Borrow`] and the
3528 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
3529 these allow C strings to be borrowed and cloned in generic code.
3530 * [`CStr`] implements [`Debug`].
3531 * [`AtomicPtr`] implements [`Debug`].
3532 * [`Error`] trait objects [can be downcast to their concrete types][e]
3533 in many common configurations, using the [`is`], [`downcast`],
3534 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
3536 * Searching for substrings now [employs the two-way algorithm][search]
3537 instead of doing a naive search. This gives major speedups to a
3538 number of methods, including [`contains`][sc], [`find`][sf],
3539 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
3540 [`ends_with`][sew] are also faster.
3541 * The performance of `PartialEq` for slices is [much faster][ps].
3542 * The [`Hash`] trait offers the default method, [`hash_slice`], which
3543 is overridden and optimized by the implementations for scalars.
3544 * The [`Hasher`] trait now has a number of specialized `write_*`
3545 methods for primitive types, for efficiency.
3546 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
3547 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
3548 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
3549 of [`std::error::Error::cause`][iec] also delegates to the inner
3551 * [`process::Child`][pc] gained the [`id`] method, which returns a
3552 `u32` representing the platform-specific process identifier.
3553 * The [`connect`] method on slices is deprecated, replaced by the new
3554 [`join`] method (note that both of these are on the *unstable*
3555 [`SliceConcatExt`] trait, but through the magic of the prelude are
3556 available to stable code anyway).
3557 * The [`Div`] operator is implemented for [`Wrapping`] types.
3558 * [`DerefMut` is implemented for `String`][dms].
3559 * Performance of SipHash (the default hasher for `HashMap`) is
3560 [better for long data][sh].
3561 * [`AtomicPtr`] implements [`Send`].
3562 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
3563 are now [specialized to use uninitalized buffers for increased
3565 * Lifetime parameters of foreign functions [are now resolved
3571 * Rust can now, with some coercion, [produce programs that run on
3572 Windows XP][xp], though XP is not considered a supported platform.
3573 * Porting Rust on Windows from the GNU toolchain to MSVC continues
3574 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
3575 recommended for use in 1.3, though should be fully-functional
3576 in the [64-bit 1.4 beta][b14].
3577 * On Fedora-based systems installation will [properly configure the
3578 dynamic linker][fl].
3579 * The compiler gained many new extended error descriptions, which can
3580 be accessed with the `--explain` flag.
3581 * The `dropck` pass, which checks that destructors can't access
3582 destroyed values, [has been rewritten][dropck]. This fixes some
3583 soundness holes, and as such will cause some previously-compiling
3584 code to no longer build.
3585 * `rustc` now uses [LLVM to write archive files where possible][ar].
3586 Eventually this will eliminate the compiler's dependency on the ar
3588 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
3589 supported FreeBSD on x86_64).
3590 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
3591 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
3593 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
3594 will kill the process instead of leaking][nlp].
3596 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
3597 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
3598 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
3599 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
3600 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
3601 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
3602 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
3603 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
3604 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
3605 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
3606 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
3607 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
3608 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
3609 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
3610 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
3611 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
3612 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
3613 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
3614 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
3615 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
3616 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
3617 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
3618 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
3619 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
3620 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
3621 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
3622 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
3623 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
3624 [ar]: https://github.com/rust-lang/rust/pull/26926
3625 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
3626 [dms]: https://github.com/rust-lang/rust/pull/26241
3627 [dropck]: https://github.com/rust-lang/rust/pull/27261
3628 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
3629 [ds]: https://github.com/rust-lang/rust/pull/26818
3630 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
3631 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
3632 [dst3]: https://github.com/rust-lang/rust/pull/27351
3633 [e]: https://github.com/rust-lang/rust/pull/24793
3634 [f]: https://github.com/rust-lang/rust/pull/26588
3635 [fb]: https://github.com/rust-lang/rust/pull/26959
3636 [fl]: https://github.com/rust-lang/rust-installer/pull/41
3637 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
3638 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
3639 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
3640 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
3641 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
3642 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
3643 [lic]: https://github.com/rust-lang/rust/pull/26583
3644 [lnu]: https://github.com/rust-lang/rust/pull/27026
3645 [lr]: https://github.com/rust-lang/rust/issues/27248
3646 [lum]: https://github.com/rust-lang/rust/pull/26378
3647 [lur]: https://github.com/rust-lang/rust/pull/26783
3648 [nlp]: https://github.com/rust-lang/rust/pull/27176
3649 [nold2]: https://github.com/rust-lang/rust/pull/27045
3650 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
3651 [nom]: http://doc.rust-lang.org/nightly/nomicon/
3652 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
3653 [pi]: https://github.com/rust-lang/rust/pull/26699
3654 [ps]: https://github.com/rust-lang/rust/pull/26884
3655 [rte]: https://github.com/rust-lang/rust/pull/26950
3656 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
3657 [search]: https://github.com/rust-lang/rust/pull/26327
3658 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
3659 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
3660 [sh]: https://github.com/rust-lang/rust/pull/27280
3661 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
3662 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
3663 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
3664 [st]: https://github.com/rust-lang/rust/pull/26630
3665 [win1]: https://github.com/rust-lang/rust/pull/26569
3666 [win2]: https://github.com/rust-lang/rust/pull/26741
3667 [win3]: https://github.com/rust-lang/rust/pull/26741
3668 [win4]: https://github.com/rust-lang/rust/pull/27210
3669 [xp]: https://github.com/rust-lang/rust/pull/26569
3671 Version 1.2.0 (2015-08-07)
3672 ==========================
3674 * ~1200 changes, numerous bugfixes
3679 * [Dynamically-sized-type coercions][dst] allow smart pointer types
3680 like `Rc` to contain types without a fixed size, arrays and trait
3681 objects, finally enabling use of `Rc<[T]>` and completing the
3682 implementation of DST.
3683 * [Parallel codegen][parcodegen] is now working again, which can
3684 substantially speed up large builds in debug mode; It also gets
3685 another ~33% speedup when bootstrapping on a 4 core machine (using 8
3686 jobs). It's not enabled by default, but will be "in the near
3687 future". It can be activated with the `-C codegen-units=N` flag to
3689 * This is the first release with [experimental support for linking
3690 with the MSVC linker and lib C on Windows (instead of using the GNU
3691 variants via MinGW)][win]. It is yet recommended only for the most
3692 intrepid Rusticians.
3693 * Benchmark compilations are showing a 30% improvement in
3694 bootstrapping over 1.1.
3699 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
3700 unicode case mapping, which is a previously-planned change in
3701 behavior and considered a bugfix.
3702 * [`mem::align_of`] now specifies [the *minimum alignment* for
3703 T][align], which is usually the alignment programs are interested
3704 in, and the same value reported by clang's
3705 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
3707 * [The `#[packed]` attribute is no longer silently accepted by the
3708 compiler][packed]. This attribute did nothing and code that
3709 mentioned it likely did not work as intended.
3710 * Associated type defaults are [now behind the
3711 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
3712 defaults *did not work*, but could be mentioned syntactically. As
3713 such this breakage has minimal impact.
3718 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
3719 matching against dereferencable values.
3724 * The [`Extend`] trait, which grows a collection from an iterator, is
3725 implemented over iterators of references, for `String`, `Vec`,
3726 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
3727 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
3728 * The [`iter::once`] function returns an iterator that yields a single
3729 element, and [`iter::empty`] returns an iterator that yields no
3731 * The [`matches`] and [`rmatches`] methods on `str` return iterators
3732 over substring matches.
3733 * [`Cell`] and [`RefCell`] both implement `Eq`.
3734 * A number of methods for wrapping arithmetic are added to the
3735 integral types, [`wrapping_div`], [`wrapping_rem`],
3736 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
3737 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
3738 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
3739 type.. It is illegal for the default arithmetic operations in Rust
3740 to overflow; the desire to wrap must be explicit.
3741 * The `{:#?}` formatting specifier [displays the alternate,
3742 pretty-printed][debugfmt] form of the `Debug` formatter. This
3743 feature was actually introduced prior to 1.0 with little
3745 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
3746 for writing data to formatted strings, similar to [`io::Write`].
3747 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
3748 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
3749 are used by code generators to emit implementations of [`Debug`].
3750 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
3751 methods that convert case, following Unicode case mapping.
3752 * It is now easier to handle poisoned locks. The [`PoisonError`]
3753 type, returned by failing lock operations, exposes `into_inner`,
3754 `get_ref`, and `get_mut`, which all give access to the inner lock
3755 guard, and allow the poisoned lock to continue to operate. The
3756 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
3757 poisoned lock without attempting to take the lock.
3758 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
3759 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
3760 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
3761 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
3763 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
3769 * `rustc` employs smarter heuristics for guessing at [typos].
3770 * `rustc` emits more efficient code for [no-op conversions between
3771 unsafe pointers][nop].
3772 * Fat pointers are now [passed in pairs of immediate arguments][fat],
3773 resulting in faster compile times and smaller code.
3775 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
3776 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
3777 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
3778 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
3779 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
3780 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
3781 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
3782 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
3783 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
3784 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
3785 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
3786 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
3787 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
3788 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
3789 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
3790 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
3791 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
3792 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
3793 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
3794 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
3795 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
3796 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
3797 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
3798 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
3799 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
3800 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
3801 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
3802 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
3803 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
3804 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
3805 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
3806 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
3807 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
3808 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
3809 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
3810 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
3811 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
3812 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
3813 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
3814 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
3815 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
3816 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
3817 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
3818 [align]: https://github.com/rust-lang/rust/pull/25646
3819 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
3820 [typos]: https://github.com/rust-lang/rust/pull/26087
3821 [nop]: https://github.com/rust-lang/rust/pull/26336
3822 [fat]: https://github.com/rust-lang/rust/pull/26411
3823 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
3824 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
3825 [packed]: https://github.com/rust-lang/rust/pull/25541
3826 [ad]: https://github.com/rust-lang/rust/pull/27382
3827 [win]: https://github.com/rust-lang/rust/pull/25350
3829 Version 1.1.0 (2015-06-25)
3830 =========================
3832 * ~850 changes, numerous bugfixes
3837 * The [`std::fs` module has been expanded][fs] to expand the set of
3838 functionality exposed:
3839 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
3840 don't incur a syscall on some platforms.
3841 * A `symlink_metadata` function has been added.
3842 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
3843 access to all underlying information.
3844 * The compiler now contains extended explanations of many errors. When an error
3845 with an explanation occurs the compiler suggests using the `--explain` flag
3846 to read the explanation. Error explanations are also [available online][err-index].
3847 * Thanks to multiple [improvements][sk] to [type checking][pre], as
3848 well as other work, the time to bootstrap the compiler decreased by
3854 * The [`str::split_whitespace`] method splits a string on unicode
3855 whitespace boundaries.
3856 * On both Windows and Unix, new extension traits provide conversion of
3857 I/O types to and from the underlying system handles. On Unix, these
3858 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
3859 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
3860 `TcpListener`, and `UpdSocket`. Further implementations for
3861 `std::process` will be stabilized later.
3862 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
3863 Windows, symlinks can be created with
3864 `std::os::windows::symlink_dir` and
3865 `std::os::windows::symlink_file`.
3866 * The `mpsc::Receiver` type can now be converted into an iterator with
3867 `into_iter` on the [`IntoIterator`] trait.
3868 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
3869 implementation of the [`From`] trait.
3870 * The `Debug` implementation for `RangeFull` [creates output that is
3871 more consistent with other implementations][rf].
3872 * [`Debug` is implemented for `File`][file].
3873 * The `Default` implementation for `Arc` [no longer requires `Sync +
3875 * [The `Iterator` methods `count`, `nth`, and `last` have been
3876 overridden for slices to have O(1) performance instead of O(n)][si].
3877 * Incorrect handling of paths on Windows has been improved in both the
3878 compiler and the standard library.
3879 * [`AtomicPtr` gained a `Default` implementation][ap].
3880 * In accordance with Rust's policy on arithmetic overflow `abs` now
3881 [panics on overflow when debug assertions are enabled][abs].
3882 * The [`Cloned`] iterator, which was accidentally left unstable for
3883 1.0 [has been stabilized][c].
3884 * The [`Incoming`] iterator, which iterates over incoming TCP
3885 connections, and which was accidentally unnamable in 1.0, [is now
3886 properly exported][inc].
3887 * [`BinaryHeap`] no longer corrupts itself [when functions called by
3888 `sift_up` or `sift_down` panic][bh].
3889 * The [`split_off`] method of `LinkedList` [no longer corrupts
3890 the list in certain scenarios][ll].
3895 * Type checking performance [has improved notably][sk] with
3896 [multiple improvements][pre].
3897 * The compiler [suggests code changes][ch] for more errors.
3898 * rustc and it's build system have experimental support for [building
3899 toolchains against MUSL][m] instead of glibc on Linux.
3900 * The compiler defines the `target_env` cfg value, which is used for
3901 distinguishing toolchains that are otherwise for the same
3902 platform. Presently this is set to `gnu` for common GNU Linux
3903 targets and for MinGW targets, and `musl` for MUSL Linux targets.
3904 * The [`cargo rustc`][crc] command invokes a build with custom flags
3906 * [Android executables are always position independent][pie].
3907 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
3910 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
3911 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
3912 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
3913 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
3914 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
3915 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
3916 [rf]: https://github.com/rust-lang/rust/pull/24491
3917 [err-index]: https://doc.rust-lang.org/error-index.html
3918 [sk]: https://github.com/rust-lang/rust/pull/24615
3919 [pre]: https://github.com/rust-lang/rust/pull/25323
3920 [file]: https://github.com/rust-lang/rust/pull/24598
3921 [ch]: https://github.com/rust-lang/rust/pull/24683
3922 [arc]: https://github.com/rust-lang/rust/pull/24695
3923 [si]: https://github.com/rust-lang/rust/pull/24701
3924 [ap]: https://github.com/rust-lang/rust/pull/24834
3925 [m]: https://github.com/rust-lang/rust/pull/24777
3926 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
3927 [crc]: https://github.com/rust-lang/cargo/pull/1568
3928 [pie]: https://github.com/rust-lang/rust/pull/24953
3929 [abs]: https://github.com/rust-lang/rust/pull/25441
3930 [c]: https://github.com/rust-lang/rust/pull/25496
3931 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
3932 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
3933 [inc]: https://github.com/rust-lang/rust/pull/25522
3934 [bh]: https://github.com/rust-lang/rust/pull/25856
3935 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
3936 [ll]: https://github.com/rust-lang/rust/pull/26022
3937 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
3938 [drop]: https://github.com/rust-lang/rust/pull/24935
3940 Version 1.0.0 (2015-05-15)
3941 ========================
3943 * ~1500 changes, numerous bugfixes
3948 * The vast majority of the standard library is now `#[stable]`. It is
3949 no longer possible to use unstable features with a stable build of
3951 * Many popular crates on [crates.io] now work on the stable release
3953 * Arithmetic on basic integer types now [checks for overflow in debug
3959 * Several [restrictions have been added to trait coherence][coh] in
3960 order to make it easier for upstream authors to change traits
3961 without breaking downstream code.
3962 * Digits of binary and octal literals are [lexed more eagerly][lex] to
3963 improve error messages and macro behavior. For example, `0b1234` is
3964 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
3965 * Trait bounds [are always invariant][inv], eliminating the need for
3966 the `PhantomFn` and `MarkerTrait` lang items, which have been
3968 * ["-" is no longer a valid character in crate names][cr], the `extern crate
3969 "foo" as bar` syntax has been replaced with `extern crate foo as
3970 bar`, and Cargo now automatically translates "-" in *package* names
3971 to underscore for the crate name.
3972 * [Lifetime shadowing is an error][lt].
3973 * [`Send` no longer implies `'static`][send-rfc].
3974 * [UFCS now supports trait-less associated paths][moar-ufcs] like
3975 `MyType::default()`.
3976 * Primitive types [now have inherent methods][prim-inherent],
3977 obviating the need for extension traits like `SliceExt`.
3978 * Methods with `Self: Sized` in their `where` clause are [considered
3979 object-safe][self-sized], allowing many extension traits like
3980 `IteratorExt` to be merged into the traits they extended.
3981 * You can now [refer to associated types][assoc-where] whose
3982 corresponding trait bounds appear only in a `where` clause.
3983 * The final bits of [OIBIT landed][oibit-final], meaning that traits
3984 like `Send` and `Sync` are now library-defined.
3985 * A [Reflect trait][reflect] was introduced, which means that
3986 downcasting via the `Any` trait is effectively limited to concrete
3987 types. This helps retain the potentially-important "parametricity"
3988 property: generic code cannot behave differently for different type
3989 arguments except in minor ways.
3990 * The `unsafe_destructor` feature is now deprecated in favor of the
3991 [new `dropck`][dropck]. This change is a major reduction in unsafe
3997 * The `thread_local` module [has been renamed to `std::thread`][th].
3998 * The methods of `IteratorExt` [have been moved to the `Iterator`
4000 * Several traits that implement Rust's conventions for type
4001 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
4002 [centralized in the `std::convert` module][con].
4003 * The `FromError` trait [was removed in favor of `From`][fe].
4004 * The basic sleep function [has moved to
4005 `std::thread::sleep_ms`][slp].
4006 * The `splitn` function now takes an `n` parameter that represents the
4007 number of items yielded by the returned iterator [instead of the
4008 number of 'splits'][spl].
4009 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
4010 * [Derived implementations of `PartialOrd` now order enums according
4011 to their explicitly-assigned discriminants][po].
4012 * [Methods for searching strings are generic over `Pattern`s][pat],
4013 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
4015 * [In method resolution, object methods are resolved before inherent
4017 * [`String::from_str` has been deprecated in favor of the `From` impl,
4018 `String::from`][sf].
4019 * [`io::Error` implements `Sync`][ios].
4020 * [The `words` method on `&str` has been replaced with
4021 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
4023 * The new path and IO modules are complete and `#[stable]`. This
4024 was the major library focus for this cycle.
4025 * The path API was [revised][path-normalize] to normalize `.`,
4026 adjusting the tradeoffs in favor of the most common usage.
4027 * A large number of remaining APIs in `std` were also stabilized
4028 during this cycle; about 75% of the non-deprecated API surface
4030 * The new [string pattern API][string-pattern] landed, which makes
4031 the string slice API much more internally consistent and flexible.
4032 * A new set of [generic conversion traits][conversion] replaced
4033 many existing ad hoc traits.
4034 * Generic numeric traits were [completely removed][num-traits]. This
4035 was made possible thanks to inherent methods for primitive types,
4036 and the removal gives maximal flexibility for designing a numeric
4037 hierarchy in the future.
4038 * The `Fn` traits are now related via [inheritance][fn-inherit]
4039 and provide ergonomic [blanket implementations][fn-blanket].
4040 * The `Index` and `IndexMut` traits were changed to
4041 [take the index by value][index-value], enabling code like
4042 `hash_map["string"]` to work.
4043 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
4044 `Copy` data is known to be `Clone` as well.
4049 * Many errors now have extended explanations that can be accessed with
4050 the `--explain` flag to `rustc`.
4051 * Many new examples have been added to the standard library
4053 * rustdoc has received a number of improvements focused on completion
4055 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
4056 * Much headway was made on ecosystem-wide CI, making it possible
4057 to [compare builds for breakage][ci-compare].
4060 [crates.io]: http://crates.io
4061 [clo]: https://github.com/rust-lang/rust/pull/24034
4062 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
4063 [con]: https://github.com/rust-lang/rust/pull/23875
4064 [cr]: https://github.com/rust-lang/rust/pull/23419
4065 [fe]: https://github.com/rust-lang/rust/pull/23879
4066 [ie]: https://github.com/rust-lang/rust/pull/23300
4067 [inv]: https://github.com/rust-lang/rust/pull/23938
4068 [ios]: https://github.com/rust-lang/rust/pull/24133
4069 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
4070 [lt]: https://github.com/rust-lang/rust/pull/24057
4071 [meth]: https://github.com/rust-lang/rust/pull/24056
4072 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
4073 [po]: https://github.com/rust-lang/rust/pull/24270
4074 [sf]: https://github.com/rust-lang/rust/pull/24517
4075 [slp]: https://github.com/rust-lang/rust/pull/23949
4076 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
4077 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
4078 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
4079 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
4080 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
4081 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
4082 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
4083 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
4084 [self-sized]: https://github.com/rust-lang/rust/pull/22301
4085 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
4086 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
4087 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
4088 [reflect]: https://github.com/rust-lang/rust/pull/23712
4089 [conversion]: https://github.com/rust-lang/rfcs/pull/529
4090 [num-traits]: https://github.com/rust-lang/rust/pull/23549
4091 [index-value]: https://github.com/rust-lang/rust/pull/23601
4092 [dropck]: https://github.com/rust-lang/rfcs/pull/769
4093 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
4094 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
4095 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
4096 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
4097 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
4100 Version 1.0.0-alpha.2 (2015-02-20)
4101 =====================================
4103 * ~1300 changes, numerous bugfixes
4107 * The various I/O modules were [overhauled][io-rfc] to reduce
4108 unnecessary abstractions and provide better interoperation with
4109 the underlying platform. The old `io` module remains temporarily
4111 * The standard library now [participates in feature gating][feat],
4112 so use of unstable libraries now requires a `#![feature(...)]`
4113 attribute. The impact of this change is [described on the
4114 forum][feat-forum]. [RFC][feat-rfc].
4118 * `for` loops [now operate on the `IntoIterator` trait][into],
4119 which eliminates the need to call `.iter()`, etc. to iterate
4120 over collections. There are some new subtleties to remember
4121 though regarding what sort of iterators various types yield, in
4122 particular that `for foo in bar { }` yields values from a move
4123 iterator, destroying the original collection. [RFC][into-rfc].
4124 * Objects now have [default lifetime bounds][obj], so you don't
4125 have to write `Box<Trait+'static>` when you don't care about
4126 storing references. [RFC][obj-rfc].
4127 * In types that implement `Drop`, [lifetimes must outlive the
4128 value][drop]. This will soon make it possible to safely
4129 implement `Drop` for types where `#[unsafe_destructor]` is now
4130 required. Read the [gorgeous RFC][drop-rfc] for details.
4131 * The fully qualified <T as Trait>::X syntax lets you set the Self
4132 type for a trait method or associated type. [RFC][ufcs-rfc].
4133 * References to types that implement `Deref<U>` now [automatically
4134 coerce to references][deref] to the dereferenced type `U`,
4135 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
4136 should eliminate many unsightly uses of `&*`, as when converting
4137 from references to vectors into references to
4138 slices. [RFC][deref-rfc].
4139 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
4140 `|:|`) is obsolete and closure kind is inferred from context.
4141 * [`Self` is a keyword][Self].
4145 * The `Show` and `String` formatting traits [have been
4146 renamed][fmt] to `Debug` and `Display` to more clearly reflect
4147 their related purposes. Automatically getting a string
4148 conversion to use with `format!("{:?}", something_to_debug)` is
4149 now written `#[derive(Debug)]`.
4150 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
4151 OsStr}`, provide strings in platform-specific encodings for easier
4152 interop with system APIs. [RFC][osstr-rfc].
4153 * The `boxed::into_raw` and `Box::from_raw` functions [convert
4154 between `Box<T>` and `*mut T`][boxraw], a common pattern for
4155 creating raw pointers.
4159 * Certain long error messages of the form 'expected foo found bar'
4160 are now [split neatly across multiple
4161 lines][multiline]. Examples in the PR.
4162 * On Unix Rust can be [uninstalled][un] by running
4163 `/usr/local/lib/rustlib/uninstall.sh`.
4164 * The `#[rustc_on_unimplemented]` attribute, requiring the
4165 'on_unimplemented' feature, lets rustc [display custom error
4166 messages when a trait is expected to be implemented for a type
4171 * Rust is tested against a [LALR grammar][lalr], which parses
4172 almost all the Rust files that rustc does.
4174 [boxraw]: https://github.com/rust-lang/rust/pull/21318
4175 [close]: https://github.com/rust-lang/rust/pull/21843
4176 [deref]: https://github.com/rust-lang/rust/pull/21351
4177 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
4178 [drop]: https://github.com/rust-lang/rust/pull/21972
4179 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
4180 [feat]: https://github.com/rust-lang/rust/pull/21248
4181 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
4182 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
4183 [fmt]: https://github.com/rust-lang/rust/pull/21457
4184 [into]: https://github.com/rust-lang/rust/pull/20790
4185 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
4186 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4187 [lalr]: https://github.com/rust-lang/rust/pull/21452
4188 [multiline]: https://github.com/rust-lang/rust/pull/19870
4189 [obj]: https://github.com/rust-lang/rust/pull/22230
4190 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
4191 [onun]: https://github.com/rust-lang/rust/pull/20889
4192 [osstr]: https://github.com/rust-lang/rust/pull/21488
4193 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
4194 [Self]: https://github.com/rust-lang/rust/pull/22158
4195 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
4196 [un]: https://github.com/rust-lang/rust/pull/22256
4199 Version 1.0.0-alpha (2015-01-09)
4200 ==================================
4202 * ~2400 changes, numerous bugfixes
4206 * The language itself is considered feature complete for 1.0,
4207 though there will be many usability improvements and bugfixes
4208 before the final release.
4209 * Nearly 50% of the public API surface of the standard library has
4210 been declared 'stable'. Those interfaces are unlikely to change
4212 * The long-running debate over integer types has been
4213 [settled][ints]: Rust will ship with types named `isize` and
4214 `usize`, rather than `int` and `uint`, for pointer-sized
4215 integers. Guidelines will be rolled out during the alpha cycle.
4216 * Most crates that are not `std` have been moved out of the Rust
4217 distribution into the Cargo ecosystem so they can evolve
4218 separately and don't need to be stabilized as quickly, including
4219 'time', 'getopts', 'num', 'regex', and 'term'.
4220 * Documentation continues to be expanded with more API coverage, more
4221 examples, and more in-depth explanations. The guides have been
4222 consolidated into [The Rust Programming Language][trpl].
4223 * "[Rust By Example][rbe]" is now maintained by the Rust team.
4224 * All official Rust binary installers now come with [Cargo], the
4225 Rust package manager.
4229 * Closures have been [completely redesigned][unboxed] to be
4230 implemented in terms of traits, can now be used as generic type
4231 bounds and thus monomorphized and inlined, or via an opaque
4232 pointer (boxed) as in the old system. The new system is often
4233 referred to as 'unboxed' closures.
4234 * Traits now support [associated types][assoc], allowing families
4235 of related types to be defined together and used generically in
4237 * Enum variants are [namespaced by their type names][enum].
4238 * [`where` clauses][where] provide a more versatile and attractive
4239 syntax for specifying generic bounds, though the previous syntax
4241 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
4243 * Rust [no longer has a runtime][rt] of any description, and only
4244 supports OS threads, not green threads.
4245 * At long last, Rust has been overhauled for 'dynamically-sized
4246 types' ([DST]), which integrates 'fat pointers' (object types,
4247 arrays, and `str`) more deeply into the type system, making it
4249 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
4250 `..j` that produce range types and which, when combined with the
4251 `Index` operator and multidispatch, leads to a convenient slice
4253 * The new range syntax revealed an ambiguity in the fixed-length
4254 array syntax, so now fixed length arrays [are written `[T;
4256 * The `Copy` trait is no longer implemented automatically. Unsafe
4257 pointers no longer implement `Sync` and `Send` so types
4258 containing them don't automatically either. `Sync` and `Send`
4259 are now 'unsafe traits' so one can "forcibly" implement them via
4260 `unsafe impl` if a type confirms to the requirements for them
4261 even though the internals do not (e.g. structs containing unsafe
4262 pointers like `Arc`). These changes are intended to prevent some
4263 footguns and are collectively known as [opt-in built-in
4264 traits][oibit] (though `Sync` and `Send` will soon become pure
4265 library types unknown to the compiler).
4266 * Operator traits now take their operands [by value][ops], and
4267 comparison traits can use multidispatch to compare one type
4268 against multiple other types, allowing e.g. `String` to be
4269 compared with `&str`.
4270 * `if let` and `while let` are no longer feature-gated.
4271 * Rust has adopted a more [uniform syntax for escaping unicode
4272 characters][unicode].
4273 * `macro_rules!` [has been declared stable][mac]. Though it is a
4274 flawed system it is sufficiently popular that it must be usable
4275 for 1.0. Effort has gone into [future-proofing][mac-future] it
4276 in ways that will allow other macro systems to be developed in
4277 parallel, and won't otherwise impact the evolution of the
4279 * The prelude has been [pared back significantly][prelude] such
4280 that it is the minimum necessary to support the most pervasive
4281 code patterns, and through [generalized where clauses][where]
4282 many of the prelude extension traits have been consolidated.
4283 * Rust's rudimentary reflection [has been removed][refl], as it
4284 incurred too much code generation for little benefit.
4285 * [Struct variants][structvars] are no longer feature-gated.
4286 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
4287 known as 'higher-ranked trait bounds', this crucially allows
4288 unboxed closures to work.
4289 * Macros invocations surrounded by parens or square brackets and
4290 not terminated by a semicolon are [parsed as
4291 expressions][macros], which makes expressions like `vec![1i32,
4292 2, 3].len()` work as expected.
4293 * Trait objects now implement their traits automatically, and
4294 traits that can be coerced to objects now must be [object
4296 * Automatically deriving traits is now done with `#[derive(...)]`
4297 not `#[deriving(...)]` for [consistency with other naming
4298 conventions][derive].
4299 * Importing the containing module or enum at the same time as
4300 items or variants they contain is [now done with `self` instead
4301 of `mod`][self], as in use `foo::{self, bar}`
4302 * Glob imports are no longer feature-gated.
4303 * The `box` operator and `box` patterns have been feature-gated
4304 pending a redesign. For now unique boxes should be allocated
4305 like other containers, with `Box::new`.
4309 * A [series][coll1] of [efforts][coll2] to establish
4310 [conventions][coll3] for collections types has resulted in API
4311 improvements throughout the standard library.
4312 * New [APIs for error handling][err] provide ergonomic interop
4313 between error types, and [new conventions][err-conv] describe
4314 more clearly the recommended error handling strategies in Rust.
4315 * The `fail!` macro has been renamed to [`panic!`][panic] so that
4316 it is easier to discuss failure in the context of error handling
4317 without making clarifications as to whether you are referring to
4318 the 'fail' macro or failure more generally.
4319 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
4320 syscall when available.
4321 * The 'serialize' crate has been renamed 'rustc-serialize' and
4322 moved out of the distribution to Cargo. Although it is widely
4323 used now, it is expected to be superseded in the near future.
4324 * The `Show` formatter, typically implemented with
4325 `#[derive(Show)]` is [now requested with the `{:?}`
4326 specifier][show] and is intended for use by all types, for uses
4327 such as `println!` debugging. The new `String` formatter must be
4328 implemented by hand, uses the `{}` specifier, and is intended
4329 for full-fidelity conversions of things that can logically be
4330 represented as strings.
4334 * [Flexible target specification][flex] allows rustc's code
4335 generation to be configured to support otherwise-unsupported
4337 * Rust comes with rust-gdb and rust-lldb scripts that launch their
4338 respective debuggers with Rust-appropriate pretty-printing.
4339 * The Windows installation of Rust is distributed with the
4340 MinGW components currently required to link binaries on that
4345 * Nullable enum optimizations have been extended to more types so
4346 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
4347 space than the inner types themselves.
4348 * Work has begun on supporting AArch64.
4350 [Cargo]: https://crates.io
4351 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
4352 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
4353 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
4354 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
4355 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
4356 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
4357 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
4358 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
4359 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
4360 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
4361 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
4362 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
4363 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
4364 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
4365 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
4366 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
4367 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
4368 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
4369 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
4370 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
4371 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
4372 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
4373 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
4374 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
4375 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
4376 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
4377 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
4378 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
4379 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
4380 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
4381 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
4382 [trpl]: https://doc.rust-lang.org/book/index.html
4383 [rbe]: http://rustbyexample.com/
4386 Version 0.12.0 (2014-10-09)
4387 =============================
4389 * ~1900 changes, numerous bugfixes
4393 * The introductory documentation (now called The Rust Guide) has
4394 been completely rewritten, as have a number of supplementary
4396 * Rust's package manager, Cargo, continues to improve and is
4397 sometimes considered to be quite awesome.
4398 * Many API's in `std` have been reviewed and updated for
4399 consistency with the in-development Rust coding
4400 guidelines. The standard library documentation tracks
4401 stabilization progress.
4402 * Minor libraries have been moved out-of-tree to the rust-lang org
4403 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
4404 be installed with Cargo.
4405 * Lifetime elision allows lifetime annotations to be left off of
4406 function declarations in many common scenarios.
4407 * Rust now works on 64-bit Windows.
4410 * Indexing can be overloaded with the `Index` and `IndexMut`
4412 * The `if let` construct takes a branch only if the `let` pattern
4413 matches, currently behind the 'if_let' feature gate.
4414 * 'where clauses', a more flexible syntax for specifying trait
4415 bounds that is more aesthetic, have been added for traits and
4416 free functions. Where clauses will in the future make it
4417 possible to constrain associated types, which would be
4418 impossible with the existing syntax.
4419 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
4420 the 'slicing_syntax' feature gate, and can be overloaded with
4421 the `Slice` or `SliceMut` traits.
4422 * The syntax for matching of sub-slices has been changed to use a
4423 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
4424 consistency with other uses of `..` and to future-proof
4425 potential additional uses of the syntax.
4426 * The syntax for matching inclusive ranges in patterns has changed
4427 from `0..3` to `0...4` to be consistent with the exclusive range
4429 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
4430 c]`) has been put behind the 'advanced_slice_patterns' feature
4431 gate and may be removed in the future.
4432 * Components of tuples and tuple structs can be extracted using
4433 the `value.0` syntax, currently behind the `tuple_indexing`
4435 * The `#[crate_id]` attribute is no longer supported; versioning
4436 is handled by the package manager.
4437 * Renaming crate imports are now written `extern crate foo as bar`
4438 instead of `extern crate bar = foo`.
4439 * Renaming use statements are now written `use foo as bar` instead
4441 * `let` and `match` bindings and argument names in macros are now
4443 * The new, more efficient, closure types ('unboxed closures') have
4444 been added under a feature gate, 'unboxed_closures'. These will
4445 soon replace the existing closure types, once higher-ranked
4446 trait lifetimes are added to the language.
4447 * `move` has been added as a keyword, for indicating closures
4448 that capture by value.
4449 * Mutation and assignment is no longer allowed in pattern guards.
4450 * Generic structs and enums can now have trait bounds.
4451 * The `Share` trait is now called `Sync` to free up the term
4452 'shared' to refer to 'shared reference' (the default reference
4454 * Dynamically-sized types have been mostly implemented,
4455 unifying the behavior of fat-pointer types with the rest of the
4457 * As part of dynamically-sized types, the `Sized` trait has been
4458 introduced, which qualifying types implement by default, and
4459 which type parameters expect by default. To specify that a type
4460 parameter does not need to be sized, write `<Sized? T>`. Most
4461 types are `Sized`, notable exceptions being unsized arrays
4462 (`[T]`) and trait types.
4463 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
4464 * Lifetime bounds can now be applied to type parameters and object
4466 * The old, reference counted GC type, `Gc<T>` which was once
4467 denoted by the `@` sigil, has finally been removed. GC will be
4468 revisited in the future.
4471 * Library documentation has been improved for a number of modules.
4472 * Bit-vectors, collections::bitv has been modernized.
4473 * The url crate is deprecated in favor of
4474 http://github.com/servo/rust-url, which can be installed with
4476 * Most I/O stream types can be cloned and subsequently closed from
4478 * A `std::time::Duration` type has been added for use in I/O
4479 methods that rely on timers, as well as in the 'time' crate's
4480 `Timespec` arithmetic.
4481 * The runtime I/O abstraction layer that enabled the green thread
4482 scheduler to do non-thread-blocking I/O has been removed, along
4483 with the libuv-based implementation employed by the green thread
4484 scheduler. This will greatly simplify the future I/O work.
4485 * `collections::btree` has been rewritten to have a more
4486 idiomatic and efficient design.
4489 * rustdoc output now indicates the stability levels of API's.
4490 * The `--crate-name` flag can specify the name of the crate
4491 being compiled, like `#[crate_name]`.
4492 * The `-C metadata` specifies additional metadata to hash into
4493 symbol names, and `-C extra-filename` specifies additional
4494 information to put into the output filename, for use by the
4495 package manager for versioning.
4496 * debug info generation has continued to improve and should be
4497 more reliable under both gdb and lldb.
4498 * rustc has experimental support for compiling in parallel
4499 using the `-C codegen-units` flag.
4500 * rustc no longer encodes rpath information into binaries by
4504 * Stack usage has been optimized with LLVM lifetime annotations.
4505 * Official Rust binaries on Linux are more compatible with older
4506 kernels and distributions, built on CentOS 5.10.
4509 Version 0.11.0 (2014-07-02)
4510 ==========================
4512 * ~1700 changes, numerous bugfixes
4515 * ~[T] has been removed from the language. This type is superseded by
4517 * ~str has been removed from the language. This type is superseded by
4519 * ~T has been removed from the language. This type is superseded by the
4521 * @T has been removed from the language. This type is superseded by the
4522 standard library's std::gc::Gc<T> type.
4523 * Struct fields are now all private by default.
4524 * Vector indices and shift amounts are both required to be a `uint`
4525 instead of any integral type.
4526 * Byte character, byte string, and raw byte string literals are now all
4527 supported by prefixing the normal literal with a `b`.
4528 * Multiple ABIs are no longer allowed in an ABI string
4529 * The syntax for lifetimes on closures/procedures has been tweaked
4530 slightly: `<'a>|A, B|: 'b + K -> T`
4531 * Floating point modulus has been removed from the language; however it
4532 is still provided by a library implementation.
4533 * Private enum variants are now disallowed.
4534 * The `priv` keyword has been removed from the language.
4535 * A closure can no longer be invoked through a &-pointer.
4536 * The `use foo, bar, baz;` syntax has been removed from the language.
4537 * The transmute intrinsic no longer works on type parameters.
4538 * Statics now allow blocks/items in their definition.
4539 * Trait bounds are separated from objects with + instead of : now.
4540 * Objects can no longer be read while they are mutably borrowed.
4541 * The address of a static is now marked as insignificant unless the
4542 #[inline(never)] attribute is placed it.
4543 * The #[unsafe_destructor] attribute is now behind a feature gate.
4544 * Struct literals are no longer allowed in ambiguous positions such as
4545 if, while, match, and for..in.
4546 * Declaration of lang items and intrinsics are now feature-gated by
4548 * Integral literals no longer default to `int`, and floating point
4549 literals no longer default to `f64`. Literals must be suffixed with an
4550 appropriate type if inference cannot determine the type of the
4552 * The Box<T> type is no longer implicitly borrowed to &mut T.
4553 * Procedures are now required to not capture borrowed references.
4556 * The standard library is now a "facade" over a number of underlying
4557 libraries. This means that development on the standard library should
4558 be speeder due to smaller crates, as well as a clearer line between
4560 * A new library, libcore, lives under the standard library's facade
4561 which is Rust's "0-assumption" library, suitable for embedded and
4562 kernel development for example.
4563 * A regex crate has been added to the standard distribution. This crate
4564 includes statically compiled regular expressions.
4565 * The unwrap/unwrap_err methods on Result require a Show bound for
4566 better error messages.
4567 * The return types of the std::comm primitives have been centralized
4568 around the Result type.
4569 * A number of I/O primitives have gained the ability to time out their
4571 * A number of I/O primitives have gained the ability to close their
4572 reading/writing halves to cancel pending operations.
4573 * Reverse iterator methods have been removed in favor of `rev()` on
4574 their forward-iteration counterparts.
4575 * A bitflags! macro has been added to enable easy interop with C and
4576 management of bit flags.
4577 * A debug_assert! macro is now provided which is disabled when
4578 `--cfg ndebug` is passed to the compiler.
4579 * A graphviz crate has been added for creating .dot files.
4580 * The std::cast module has been migrated into std::mem.
4581 * The std::local_data api has been migrated from freestanding functions
4582 to being based on methods.
4583 * The Pod trait has been renamed to Copy.
4584 * jemalloc has been added as the default allocator for types.
4585 * The API for allocating memory has been changed to use proper alignment
4586 and sized deallocation
4587 * Connecting a TcpStream or binding a TcpListener is now based on a
4588 string address and a u16 port. This allows connecting to a hostname as
4590 * The Reader trait now contains a core method, read_at_least(), which
4591 correctly handles many repeated 0-length reads.
4592 * The process-spawning API is now centered around a builder-style
4594 * The :? printing qualifier has been moved from the standard library to
4595 an external libdebug crate.
4596 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
4597 have been renamed to Eq/Ord.
4598 * The select/plural methods have been removed from format!. The escapes
4599 for { and } have also changed from \{ and \} to {{ and }},
4601 * The TaskBuilder API has been re-worked to be a true builder, and
4602 extension traits for spawning native/green tasks have been added.
4605 * All breaking changes to the language or libraries now have their
4606 commit message annotated with `[breaking-change]` to allow for easy
4607 discovery of breaking changes.
4608 * The compiler will now try to suggest how to annotate lifetimes if a
4609 lifetime-related error occurs.
4610 * Debug info continues to be improved greatly with general bug fixes and
4611 better support for situations like link time optimization (LTO).
4612 * Usage of syntax extensions when cross-compiling has been fixed.
4613 * Functionality equivalent to GCC & Clang's -ffunction-sections,
4614 -fdata-sections and --gc-sections has been enabled by default
4615 * The compiler is now stricter about where it will load module files
4616 from when a module is declared via `mod foo;`.
4617 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
4618 Syntax extensions are now discovered via a "plugin registrar" type
4619 which will be extended in the future to other various plugins.
4620 * Lints have been restructured to allow for dynamically loadable lints.
4621 * A number of rustdoc improvements:
4622 * The HTML output has been visually redesigned.
4623 * Markdown is now powered by hoedown instead of sundown.
4624 * Searching heuristics have been greatly improved.
4625 * The search index has been reduced in size by a great amount.
4626 * Cross-crate documentation via `pub use` has been greatly improved.
4627 * Primitive types are now hyperlinked and documented.
4628 * Documentation has been moved from static.rust-lang.org/doc to
4630 * A new sandbox, play.rust-lang.org, is available for running and
4631 sharing rust code examples on-line.
4632 * Unused attributes are now more robustly warned about.
4633 * The dead_code lint now warns about unused struct fields.
4634 * Cross-compiling to iOS is now supported.
4635 * Cross-compiling to mipsel is now supported.
4636 * Stability attributes are now inherited by default and no longer apply
4637 to intra-crate usage, only inter-crate usage.
4638 * Error message related to non-exhaustive match expressions have been
4642 Version 0.10 (2014-04-03)
4643 =========================
4645 * ~1500 changes, numerous bugfixes
4648 * A new RFC process is now in place for modifying the language.
4649 * Patterns with `@`-pointers have been removed from the language.
4650 * Patterns with unique vectors (`~[T]`) have been removed from the
4652 * Patterns with unique strings (`~str`) have been removed from the
4654 * `@str` has been removed from the language.
4655 * `@[T]` has been removed from the language.
4656 * `@self` has been removed from the language.
4657 * `@Trait` has been removed from the language.
4658 * Headers on `~` allocations which contain `@` boxes inside the type for
4659 reference counting have been removed.
4660 * The semantics around the lifetimes of temporary expressions have changed,
4661 see #3511 and #11585 for more information.
4662 * Cross-crate syntax extensions are now possible, but feature gated. See
4663 #11151 for more information. This includes both `macro_rules!` macros as
4664 well as syntax extensions such as `format!`.
4665 * New lint modes have been added, and older ones have been turned on to be
4667 * Unnecessary parentheses
4670 * Uppercase variables
4671 * Publicly visible private types
4672 * `#[deriving]` with raw pointers
4673 * Unsafe functions can no longer be coerced to closures.
4674 * Various obscure macros such as `log_syntax!` are now behind feature gates.
4675 * The `#[simd]` attribute is now behind a feature gate.
4676 * Visibility is no longer allowed on `extern crate` statements, and
4677 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
4678 * Trailing commas are now allowed in argument lists and tuple patterns.
4679 * The `do` keyword has been removed, it is now a reserved keyword.
4680 * Default type parameters have been implemented, but are feature gated.
4681 * Borrowed variables through captures in closures are now considered soundly.
4682 * `extern mod` is now `extern crate`
4683 * The `Freeze` trait has been removed.
4684 * The `Share` trait has been added for types that can be shared among
4686 * Labels in macros are now hygienic.
4687 * Expression/statement macro invocations can be delimited with `{}` now.
4688 * Treatment of types allowed in `static mut` locations has been tweaked.
4689 * The `*` and `.` operators are now overloadable through the `Deref` and
4691 * `~Trait` and `proc` no longer have `Send` bounds by default.
4692 * Partial type hints are now supported with the `_` type marker.
4693 * An `Unsafe` type was introduced for interior mutability. It is now
4694 considered undefined to transmute from `&T` to `&mut T` without using the
4696 * The #[linkage] attribute was implemented for extern statics/functions.
4697 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
4698 * `Pod` was renamed to `Copy`.
4701 * The `libextra` library has been removed. It has now been decomposed into
4702 component libraries with smaller and more focused nuggets of
4703 functionality. The full list of libraries can be found on the
4704 documentation index page.
4705 * std: `std::condition` has been removed. All I/O errors are now propagated
4706 through the `Result` type. In order to assist with error handling, a
4707 `try!` macro for unwrapping errors with an early return and a lint for
4708 unused results has been added. See #12039 for more information.
4709 * std: The `vec` module has been renamed to `slice`.
4710 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
4711 This will become the only growable vector in the future.
4712 * std: `std::io` now has more public-reexports. Types such as `BufferedReader`
4713 are now found at `std::io::BufferedReader` instead of
4714 `std::io::buffered::BufferedReader`.
4715 * std: `print` and `println` are no longer in the prelude, the `print!` and
4716 `println!` macros are intended to be used instead.
4717 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
4718 attempts to statically prevent cycles.
4719 * std: The standard distribution is adopting the policy of pushing failure
4720 to the user rather than failing in libraries. Many functions (such as
4721 `slice::last()`) now return `Option<T>` instead of `T` + failing.
4722 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
4723 deriving mode: `#[deriving(Show)]`.
4724 * std: `ToStr` is now implemented for all types implementing `Show`.
4725 * std: The formatting trait methods now take `&self` instead of `&T`
4726 * std: The `invert()` method on iterators has been renamed to `rev()`
4727 * std: `std::num` has seen a reduction in the genericity of its traits,
4728 consolidating functionality into a few core traits.
4729 * std: Backtraces are now printed on task failure if the environment
4730 variable `RUST_BACKTRACE` is present.
4731 * std: Naming conventions for iterators have been standardized. More details
4732 can be found on the wiki's style guide.
4733 * std: `eof()` has been removed from the `Reader` trait. Specific types may
4734 still implement the function.
4735 * std: Networking types are now cloneable to allow simultaneous reads/writes.
4736 * std: `assert_approx_eq!` has been removed
4737 * std: The `e` and `E` formatting specifiers for floats have been added to
4738 print them in exponential notation.
4739 * std: The `Times` trait has been removed
4740 * std: Indications of variance and opting out of builtin bounds is done
4741 through marker types in `std::kinds::marker` now
4742 * std: `hash` has been rewritten, `IterBytes` has been removed, and
4743 `#[deriving(Hash)]` is now possible.
4744 * std: `SharedChan` has been removed, `Sender` is now cloneable.
4745 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
4746 * std: `Chan::new` is now `channel()`.
4747 * std: A new synchronous channel type has been implemented.
4748 * std: A `select!` macro is now provided for selecting over `Receiver`s.
4749 * std: `hashmap` and `trie` have been moved to `libcollections`
4750 * std: `run` has been rolled into `io::process`
4751 * std: `assert_eq!` now uses `{}` instead of `{:?}`
4752 * std: The equality and comparison traits have seen some reorganization.
4753 * std: `rand` has moved to `librand`.
4754 * std: `to_{lower,upper}case` has been implemented for `char`.
4755 * std: Logging has been moved to `liblog`.
4756 * collections: `HashMap` has been rewritten for higher performance and less
4758 * native: The default runtime is now `libnative`. If `libgreen` is desired,
4759 it can be booted manually. The runtime guide has more information and
4761 * native: All I/O functionality except signals has been implemented.
4762 * green: Task spawning with `libgreen` has been optimized with stack caching
4763 and various trimming of code.
4764 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
4765 * sync: The `extra::sync` module has been updated to modern rust (and moved
4766 to the `sync` library), tweaking and improving various interfaces while
4767 dropping redundant functionality.
4768 * sync: A new `Barrier` type has been added to the `sync` library.
4769 * sync: An efficient mutex for native and green tasks has been implemented.
4770 * serialize: The `base64` module has seen some improvement. It treats
4771 newlines better, has non-string error values, and has seen general
4773 * fourcc: A `fourcc!` macro was introduced
4774 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
4775 hexadecimal literal.
4778 * `rustpkg` has been deprecated and removed from the main repository. Its
4779 replacement, `cargo`, is under development.
4780 * Nightly builds of rust are now available
4781 * The memory usage of rustc has been improved many times throughout this
4783 * The build process supports disabling rpath support for the rustc binary
4785 * Code generation has improved in some cases, giving more information to the
4786 LLVM optimization passes to enable more extensive optimizations.
4787 * Debuginfo compatibility with lldb on OSX has been restored.
4788 * The master branch is now gated on an android bot, making building for
4789 android much more reliable.
4790 * Output flags have been centralized into one `--emit` flag.
4791 * Crate type flags have been centralized into one `--crate-type` flag.
4792 * Codegen flags have been consolidated behind a `-C` flag.
4793 * Linking against outdated crates now has improved error messages.
4794 * Error messages with lifetimes will often suggest how to annotate the
4795 function to fix the error.
4796 * Many more types are documented in the standard library, and new guides
4798 * Many `rustdoc` improvements:
4799 * code blocks are syntax highlighted.
4800 * render standalone markdown files.
4801 * the --test flag tests all code blocks by default.
4802 * exported macros are displayed.
4803 * reexported types have their documentation inlined at the location of the
4805 * search works across crates that have been rendered to the same output
4809 Version 0.9 (2014-01-09)
4810 ==========================
4812 * ~1800 changes, numerous bugfixes
4815 * The `float` type has been removed. Use `f32` or `f64` instead.
4816 * A new facility for enabling experimental features (feature gating) has
4817 been added, using the crate-level `#[feature(foo)]` attribute.
4818 * Managed boxes (@) are now behind a feature gate
4819 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
4820 standard library's `Gc` or `Rc` types instead.
4821 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
4822 * Jumping back to the top of a loop is now done with `continue` instead of
4824 * Strings can no longer be mutated through index assignment.
4825 * Raw strings can be created via the basic `r"foo"` syntax or with matched
4826 hash delimiters, as in `r###"foo"###`.
4827 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
4829 * The `&fn` type is now written `|args| -> ret` to match the literal form.
4830 * `@fn`s have been removed.
4831 * `do` only works with procs in order to make it obvious what the cost
4833 * Single-element tuple-like structs can no longer be dereferenced to
4834 obtain the inner value. A more comprehensive solution for overloading
4835 the dereference operator will be provided in the future.
4836 * The `#[link(...)]` attribute has been replaced with
4837 `#[crate_id = "name#vers"]`.
4838 * Empty `impl`s must be terminated with empty braces and may not be
4839 terminated with a semicolon.
4840 * Keywords are no longer allowed as lifetime names; the `self` lifetime
4841 no longer has any special meaning.
4842 * The old `fmt!` string formatting macro has been removed.
4843 * `printf!` and `printfln!` (old-style formatting) removed in favor of
4844 `print!` and `println!`.
4845 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
4846 * The `extern mod foo (name = "bar")` syntax has been removed. Use
4847 `extern mod foo = "bar"` instead.
4848 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
4849 * Macros can have attributes.
4850 * Macros can expand to items with attributes.
4851 * Macros can expand to multiple items.
4852 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
4853 * Comments may be nested.
4854 * Values automatically coerce to trait objects they implement, without
4856 * Enum discriminants are no longer an entire word but as small as needed to
4857 contain all the variants. The `repr` attribute can be used to override
4858 the discriminant size, as in `#[repr(int)]` for integer-sized, and
4859 `#[repr(C)]` to match C enums.
4860 * Non-string literals are not allowed in attributes (they never worked).
4861 * The FFI now supports variadic functions.
4862 * Octal numeric literals, as in `0o7777`.
4863 * The `concat!` syntax extension performs compile-time string concatenation.
4864 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
4865 removed as Rust no longer uses segmented stacks.
4866 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
4867 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
4868 not `*`; ignoring remaining fields of a struct is also done with `..`,
4869 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
4870 * `rustc` supports the "win64" calling convention via `extern "win64"`.
4871 * `rustc` supports the "system" calling convention, which defaults to the
4872 preferred convention for the target platform, "stdcall" on 32-bit Windows,
4874 * The `type_overflow` lint (default: warn) checks literals for overflow.
4875 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
4876 * The `attribute_usage` lint (default: warn) warns about unknown
4878 * The `unknown_features` lint (default: warn) warns about unknown
4880 * The `dead_code` lint (default: warn) checks for dead code.
4881 * Rust libraries can be linked statically to one another
4882 * `#[link_args]` is behind the `link_args` feature gate.
4883 * Native libraries are now linked with `#[link(name = "foo")]`
4884 * Native libraries can be statically linked to a rust crate
4885 (`#[link(name = "foo", kind = "static")]`).
4886 * Native OS X frameworks are now officially supported
4887 (`#[link(name = "foo", kind = "framework")]`).
4888 * The `#[thread_local]` attribute creates thread-local (not task-local)
4889 variables. Currently behind the `thread_local` feature gate.
4890 * The `return` keyword may be used in closures.
4891 * Types that can be copied via a memcpy implement the `Pod` kind.
4892 * The `cfg` attribute can now be used on struct fields and enum variants.
4895 * std: The `option` and `result` API's have been overhauled to make them
4896 simpler, more consistent, and more composable.
4897 * std: The entire `std::io` module has been replaced with one that is
4898 more comprehensive and that properly interfaces with the underlying
4899 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
4901 * std: `io::util` contains a number of useful implementations of
4902 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
4903 `ZeroReader`, `TeeReader`.
4904 * std: The reference counted pointer type `extra::rc` moved into std.
4905 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
4906 just a wrapper around it).
4907 * std: The `Either` type has been removed.
4908 * std: `fmt::Default` can be implemented for any type to provide default
4909 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
4910 * std: The `rand` API continues to be tweaked.
4911 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
4912 on failure in gdb, is now named `rust_fail`.
4913 * std: The `each_key` and `each_value` methods on `HashMap` have been
4914 replaced by the `keys` and `values` iterators.
4915 * std: Functions dealing with type size and alignment have moved from the
4916 `sys` module to the `mem` module.
4917 * std: The `path` module was written and API changed.
4918 * std: `str::from_utf8` has been changed to cast instead of allocate.
4919 * std: `starts_with` and `ends_with` methods added to vectors via the
4920 `ImmutableEqVector` trait, which is in the prelude.
4921 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
4922 if the index is out of bounds.
4923 * std: Task failure no longer propagates between tasks, as the model was
4924 complex, expensive, and incompatible with thread-based tasks.
4925 * std: The `Any` type can be used for dynamic typing.
4926 * std: `~Any` can be passed to the `fail!` macro and retrieved via
4928 * std: Methods that produce iterators generally do not have an `_iter`
4930 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
4931 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
4932 * std: `util::ignore` renamed to `prelude::drop`.
4933 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
4935 * std: `vec::raw` has seen a lot of cleanup and API changes.
4936 * std: The standard library no longer includes any C++ code, and very
4937 minimal C, eliminating the dependency on libstdc++.
4938 * std: Runtime scheduling and I/O functionality has been factored out into
4939 extensible interfaces and is now implemented by two different crates:
4940 libnative, for native threading and I/O; and libgreen, for green threading
4941 and I/O. This paves the way for using the standard library in more limited
4942 embedded environments.
4943 * std: The `comm` module has been rewritten to be much faster, have a
4944 simpler, more consistent API, and to work for both native and green
4946 * std: All libuv dependencies have been moved into the rustuv crate.
4947 * native: New implementations of runtime scheduling on top of OS threads.
4948 * native: New native implementations of TCP, UDP, file I/O, process spawning,
4950 * green: The green thread scheduler and message passing types are almost
4952 * extra: The `flatpipes` module had bitrotted and was removed.
4953 * extra: All crypto functions have been removed and Rust now has a policy of
4954 not reimplementing crypto in the standard library. In the future crypto
4955 will be provided by external crates with bindings to established libraries.
4956 * extra: `c_vec` has been modernized.
4957 * extra: The `sort` module has been removed. Use the `sort` method on
4961 * The `rust` and `rusti` commands have been removed, due to lack of
4963 * `rustdoc` was completely rewritten.
4964 * `rustdoc` can test code examples in documentation.
4965 * `rustpkg` can test packages with the argument, 'test'.
4966 * `rustpkg` supports arbitrary dependencies, including C libraries.
4967 * `rustc`'s support for generating debug info is improved again.
4968 * `rustc` has better error reporting for unbalanced delimiters.
4969 * `rustc`'s JIT support was removed due to bitrot.
4970 * Executables and static libraries can be built with LTO (-Z lto)
4971 * `rustc` adds a `--dep-info` flag for communicating dependencies to
4975 Version 0.8 (2013-09-26)
4976 ============================
4978 * ~2200 changes, numerous bugfixes
4981 * The `for` loop syntax has changed to work with the `Iterator` trait.
4982 * At long last, unwinding works on Windows.
4983 * Default methods are ready for use.
4984 * Many trait inheritance bugs fixed.
4985 * Owned and borrowed trait objects work more reliably.
4986 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
4987 * rustc can omit emission of code for the `debug!` macro if it is passed
4989 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
4990 for foo.rs, then foo/mod.rs, and will generate an error when both are
4992 * Strings no longer contain trailing nulls. The new `std::c_str` module
4993 provides new mechanisms for converting to C strings.
4994 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
4995 * The FFI has been overhauled such that foreign functions are called directly,
4996 instead of through a stack-switching wrapper.
4997 * Calling a foreign function must be done through a Rust function with the
4998 `#[fixed_stack_segment]` attribute.
4999 * The `externfn!` macro can be used to declare both a foreign function and
5000 a `#[fixed_stack_segment]` wrapper at once.
5001 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
5002 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
5003 * `priv` is disallowed everywhere except for struct fields and enum variants.
5004 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
5005 * `ref` bindings in irrefutable patterns work correctly now.
5006 * `char` is now prevented from containing invalid code points.
5007 * Casting to `bool` is no longer allowed.
5008 * `\0` is now accepted as an escape in chars and strings.
5009 * `yield` is a reserved keyword.
5010 * `typeof` is a reserved keyword.
5011 * Crates may be imported by URL with `extern mod foo = "url";`.
5012 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
5013 * Static vectors can be initialized with repeating elements,
5014 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
5015 * Static structs can be initialized with functional record update,
5016 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
5017 * `cfg!` can be used to conditionally execute code based on the crate
5018 configuration, similarly to `#[cfg(...)]`.
5019 * The `unnecessary_qualification` lint detects unneeded module
5020 prefixes (default: allow).
5021 * Arithmetic operations have been implemented on the SIMD types in
5022 `std::unstable::simd`.
5023 * Exchange allocation headers were removed, reducing memory usage.
5024 * `format!` implements a completely new, extensible, and higher-performance
5025 string formatting system. It will replace `fmt!`.
5026 * `print!` and `println!` write formatted strings (using the `format!`
5027 extension) to stdout.
5028 * `write!` and `writeln!` write formatted strings (using the `format!`
5029 extension) to the new Writers in `std::rt::io`.
5030 * The library section in which a function or static is placed may
5031 be specified with `#[link_section = "..."]`.
5032 * The `proto!` syntax extension for defining bounded message protocols
5034 * `macro_rules!` is hygienic for `let` declarations.
5035 * The `#[export_name]` attribute specifies the name of a symbol.
5036 * `unreachable!` can be used to indicate unreachable code, and fails
5040 * std: Transitioned to the new runtime, written in Rust.
5041 * std: Added an experimental I/O library, `rt::io`, based on the new
5043 * std: A new generic `range` function was added to the prelude, replacing
5044 `uint::range` and friends.
5045 * std: `range_rev` no longer exists. Since range is an iterator it can be
5046 reversed with `range(lo, hi).invert()`.
5047 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
5048 renamed to `unwrap_or`.
5049 * std: The `iterator` module was renamed to `iter`.
5050 * std: Integral types now support the `checked_add`, `checked_sub`, and
5051 `checked_mul` operations for detecting overflow.
5052 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
5054 * std: Methods are standardizing on conventions for casting methods:
5055 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
5057 * std: The `CString` type in `c_str` provides new ways to convert to and
5059 * std: `DoubleEndedIterator` can yield elements in two directions.
5060 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
5062 * std: `str::from_bytes` renamed to `str::from_utf8`.
5063 * std: `pop_opt` and `shift_opt` methods added to vectors.
5064 * std: The task-local data interface no longer uses @, and keys are
5065 no longer function pointers.
5066 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
5067 * std: Added `SharedPort` to `comm`.
5068 * std: `Eq` has a default method for `ne`; only `eq` is required
5070 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
5071 is required in implementations.
5072 * std: `is_utf8` performance is improved, impacting many string functions.
5073 * std: `os::MemoryMap` provides cross-platform mmap.
5074 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
5075 are not 'in-bounds' are considered undefined.
5076 * std: Many freestanding functions in `vec` removed in favor of methods.
5077 * std: Many freestanding functions on scalar types removed in favor of
5079 * std: Many options to task builders were removed since they don't make
5080 sense in the new scheduler design.
5081 * std: More containers implement `FromIterator` so can be created by the
5083 * std: More complete atomic types in `unstable::atomics`.
5084 * std: `comm::PortSet` removed.
5085 * std: Mutating methods in the `Set` and `Map` traits have been moved into
5086 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
5087 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
5088 default implementations.
5089 * std: Various `from_str` functions were removed in favor of a generic
5090 `from_str` which is available in the prelude.
5091 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
5092 * extra: `dlist`, the doubly-linked list was modernized.
5093 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
5094 * extra: Added `glob` module, replacing `std::os::glob`.
5095 * extra: `rope` was removed.
5096 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
5097 * extra: `net`, and `timer` were removed. The experimental replacements
5098 are `std::rt::io::net` and `std::rt::io::timer`.
5099 * extra: Iterators implemented for `SmallIntMap`.
5100 * extra: Iterators implemented for `Bitv` and `BitvSet`.
5101 * extra: `SmallIntSet` removed. Use `BitvSet`.
5102 * extra: Performance of JSON parsing greatly improved.
5103 * extra: `semver` updated to SemVer 2.0.0.
5104 * extra: `term` handles more terminals correctly.
5105 * extra: `dbg` module removed.
5106 * extra: `par` module removed.
5107 * extra: `future` was cleaned up, with some method renames.
5108 * extra: Most free functions in `getopts` were converted to methods.
5111 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
5112 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
5113 similarly to gcc's `--march` flag.
5114 * rustc's performance compiling small crates is much better.
5115 * rustpkg has received many improvements.
5116 * rustpkg supports git tags as package IDs.
5117 * rustpkg builds into target-specific directories so it can be used for
5119 * The number of concurrent test tasks is controlled by the environment
5120 variable RUST_TEST_TASKS.
5121 * The test harness can now report metrics for benchmarks.
5122 * All tools have man pages.
5123 * Programs compiled with `--test` now support the `-h` and `--help` flags.
5124 * The runtime uses jemalloc for allocations.
5125 * Segmented stacks are temporarily disabled as part of the transition to
5126 the new runtime. Stack overflows are possible!
5127 * A new documentation backend, rustdoc_ng, is available for use. It is
5128 still invoked through the normal `rustdoc` command.
5131 Version 0.7 (2013-07-03)
5132 =======================
5134 * ~2000 changes, numerous bugfixes
5137 * `impl`s no longer accept a visibility qualifier. Put them on methods
5139 * The borrow checker has been rewritten with flow-sensitivity, fixing
5140 many bugs and inconveniences.
5141 * The `self` parameter no longer implicitly means `&'self self`,
5142 and can be explicitly marked with a lifetime.
5143 * Overloadable compound operators (`+=`, etc.) have been temporarily
5144 removed due to bugs.
5145 * The `for` loop protocol now requires `for`-iterators to return `bool`
5146 so they compose better.
5147 * The `Durable` trait is replaced with the `'static` bounds.
5148 * Trait default methods work more often.
5149 * Structs with the `#[packed]` attribute have byte alignment and
5150 no padding between fields.
5151 * Type parameters bound by `Copy` must now be copied explicitly with
5153 * It is now illegal to move out of a dereferenced unsafe pointer.
5154 * `Option<~T>` is now represented as a nullable pointer.
5155 * `@mut` does dynamic borrow checks correctly.
5156 * The `main` function is only detected at the topmost level of the crate.
5157 The `#[main]` attribute is still valid anywhere.
5158 * Struct fields may no longer be mutable. Use inherited mutability.
5159 * The `#[no_send]` attribute makes a type that would otherwise be
5161 * The `#[no_freeze]` attribute makes a type that would otherwise be
5163 * Unbounded recursion will abort the process after reaching the limit
5164 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
5165 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
5166 are never implicitly copyable.
5167 * `#[static_assert]` makes compile-time assertions about static bools.
5168 * At long last, 'argument modes' no longer exist.
5169 * The rarely used `use mod` statement no longer exists.
5172 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
5174 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
5175 `Rand`, `Zero` and `ToStr` can all be automatically derived with
5177 * The `bytes!` macro returns a vector of bytes for string, u8, char,
5178 and unsuffixed integer literals.
5181 * The `core` crate was renamed to `std`.
5182 * The `std` crate was renamed to `extra`.
5183 * More and improved documentation.
5184 * std: `iterator` module for external iterator objects.
5185 * Many old-style (internal, higher-order function) iterators replaced by
5186 implementations of `Iterator`.
5187 * std: Many old internal vector and string iterators,
5188 incl. `any`, `all`. removed.
5189 * std: The `finalize` method of `Drop` renamed to `drop`.
5190 * std: The `drop` method now takes `&mut self` instead of `&self`.
5191 * std: The prelude no longer reexports any modules, only types and traits.
5192 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
5193 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
5194 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
5195 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
5196 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
5197 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
5198 * std: Many types implement `Clone`.
5199 * std: `path` type renamed to `Path`.
5200 * std: `mut` module and `Mut` type removed.
5201 * std: Many standalone functions removed in favor of methods and iterators
5202 in `vec`, `str`. In the future methods will also work as functions.
5203 * std: `reinterpret_cast` removed. Use `transmute`.
5204 * std: ascii string handling in `std::ascii`.
5205 * std: `Rand` is implemented for ~/@.
5206 * std: `run` module for spawning processes overhauled.
5207 * std: Various atomic types added to `unstable::atomic`.
5208 * std: Various types implement `Zero`.
5209 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
5210 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
5211 * std: Added `os::mkdir_recursive`.
5212 * std: Added `os::glob` function performs filesystems globs.
5213 * std: `FuzzyEq` renamed to `ApproxEq`.
5214 * std: `Map` now defines `pop` and `swap` methods.
5215 * std: `Cell` constructors converted to static methods.
5216 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
5217 * extra: `flate` module moved from `std` to `extra`.
5218 * extra: `fileinput` module for iterating over a series of files.
5219 * extra: `Complex` number type and `complex` module.
5220 * extra: `Rational` number type and `rational` module.
5221 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
5222 * extra: `term` uses terminfo now, is more correct.
5223 * extra: `arc` functions converted to methods.
5224 * extra: Implementation of fixed output size variations of SHA-2.
5227 * `unused_variable` lint mode for unused variables (default: warn).
5228 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
5230 * `unused_mut` lint mode for identifying unused `mut` qualifiers
5232 * `dead_assignment` lint mode for unread variables (default: warn).
5233 * `unnecessary_allocation` lint mode detects some heap allocations that are
5234 immediately borrowed so could be written without allocating (default: warn).
5235 * `missing_doc` lint mode (default: allow).
5236 * `unreachable_code` lint mode (default: warn).
5237 * The `rusti` command has been rewritten and a number of bugs addressed.
5238 * rustc outputs in color on more terminals.
5239 * rustc accepts a `--link-args` flag to pass arguments to the linker.
5240 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
5241 * Compiling with `-g` will make the binary record information about
5242 dynamic borrowcheck failures for debugging.
5243 * rustdoc has a nicer stylesheet.
5244 * Various improvements to rustdoc.
5245 * Improvements to rustpkg (see the detailed release notes).
5248 Version 0.6 (2013-04-03)
5249 ========================
5251 * ~2100 changes, numerous bugfixes
5254 * The self type parameter in traits is now spelled `Self`
5255 * The `self` parameter in trait and impl methods must now be explicitly
5256 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
5257 * Static methods no longer require the `static` keyword and instead
5258 are distinguished by the lack of a `self` parameter
5259 * Replaced the `Durable` trait with the `'static` lifetime
5260 * The old closure type syntax with the trailing sigil has been
5261 removed in favor of the more consistent leading sigil
5262 * `super` is a keyword, and may be prefixed to paths
5263 * Trait bounds are separated with `+` instead of whitespace
5264 * Traits are implemented with `impl Trait for Type`
5265 instead of `impl Type: Trait`
5266 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
5267 * The `export` keyword has finally been removed
5268 * The `move` keyword has been removed (see "Semantic changes")
5269 * The interior mutability qualifier on vectors, `[mut T]`, has been
5270 removed. Use `&mut [T]`, etc.
5271 * `mut` is no longer valid in `~mut T`. Use inherited mutability
5272 * `fail` is no longer a keyword. Use `fail!()`
5273 * `assert` is no longer a keyword. Use `assert!()`
5274 * `log` is no longer a keyword. use `debug!`, etc.
5275 * 1-tuples may be represented as `(T,)`
5276 * Struct fields may no longer be `mut`. Use inherited mutability,
5277 `@mut T`, `core::mut` or `core::cell`
5278 * `extern mod { ... }` is no longer valid syntax for foreign
5279 function modules. Use extern blocks: `extern { ... }`
5280 * Newtype enums removed. Use tuple-structs.
5281 * Trait implementations no longer support visibility modifiers
5282 * Pattern matching over vectors improved and expanded
5283 * `const` renamed to `static` to correspond to lifetime name,
5284 and make room for future `static mut` unsafe mutable globals.
5285 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
5286 * `Clone` implementations can be automatically generated with
5287 `#[deriving(Clone)]`
5288 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
5289 instead of `foo as Bar`.
5290 * Fixed length vector types are now written as `[int, .. 3]`
5291 instead of `[int * 3]`.
5292 * Fixed length vector types can express the length as a constant
5293 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
5296 * Types with owned pointers or custom destructors move by default,
5297 eliminating the `move` keyword
5298 * All foreign functions are considered unsafe
5299 * &mut is now unaliasable
5300 * Writes to borrowed @mut pointers are prevented dynamically
5302 * The name of the main function can be customized using #[main]
5303 * The default type of an inferred closure is &fn instead of @fn
5304 * `use` statements may no longer be "chained" - they cannot import
5305 identifiers imported by previous `use` statements
5306 * `use` statements are crate relative, importing from the "top"
5307 of the crate by default. Paths may be prefixed with `super::`
5308 or `self::` to change the search behavior.
5309 * Method visibility is inherited from the implementation declaration
5310 * Structural records have been removed
5311 * Many more types can be used in static items, including enums
5312 'static-lifetime pointers and vectors
5313 * Pattern matching over vectors improved and expanded
5314 * Typechecking of closure types has been overhauled to
5315 improve inference and eliminate unsoundness
5316 * Macros leave scope at the end of modules, unless that module is
5317 tagged with #[macro_escape]
5320 * Added big integers to `std::bigint`
5321 * Removed `core::oldcomm` module
5322 * Added pipe-based `core::comm` module
5323 * Numeric traits have been reorganized under `core::num`
5324 * `vec::slice` finally returns a slice
5325 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
5326 * Containers reorganized around traits in `core::container`
5327 * `core::dvec` removed, `~[T]` is a drop-in replacement
5328 * `core::send_map` renamed to `core::hashmap`
5329 * `std::map` removed; replaced with `core::hashmap`
5330 * `std::treemap` reimplemented as an owned balanced tree
5331 * `std::deque` and `std::smallintmap` reimplemented as owned containers
5332 * `core::trie` added as a fast ordered map for integer keys
5333 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
5334 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
5335 overload the comparison operators, whereas `TotalOrd` is used
5336 by certain container types
5339 * Replaced the 'cargo' package manager with 'rustpkg'
5340 * Added all-purpose 'rust' tool
5341 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
5342 * rustc now *attempts* to offer spelling suggestions
5343 * Improved support for ARM and Android
5344 * Preliminary MIPS backend
5345 * Improved foreign function ABI implementation for x86, x86_64
5346 * Various memory usage improvements
5347 * Rust code may be embedded in foreign code under limited circumstances
5348 * Inline assembler supported by new asm!() syntax extension.
5351 Version 0.5 (2012-12-21)
5352 ===========================
5354 * ~900 changes, numerous bugfixes
5357 * Removed `<-` move operator
5358 * Completed the transition from the `#fmt` extension syntax to `fmt!`
5359 * Removed old fixed length vector syntax - `[T]/N`
5360 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
5361 * Macros may now expand to items and statements
5362 * `a.b()` is always parsed as a method call, never as a field projection
5363 * `Eq` and `IterBytes` implementations can be automatically generated
5364 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
5365 * Removed the special crate language for `.rc` files
5366 * Function arguments may consist of any irrefutable pattern
5369 * `&` and `~` pointers may point to objects
5370 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
5371 * Enum variants may be structs
5372 * Destructors can be added to all nominal types with the Drop trait
5373 * Structs and nullary enum variants may be constants
5374 * Values that cannot be implicitly copied are now automatically moved
5375 without writing `move` explicitly
5376 * `&T` may now be coerced to `*T`
5377 * Coercions happen in `let` statements as well as function calls
5378 * `use` statements now take crate-relative paths
5379 * The module and type namespaces have been merged so that static
5380 method names can be resolved under the trait in which they are
5383 * Improved support for language features
5384 * Trait inheritance works in many scenarios
5385 * More support for explicit self arguments in methods - `self`, `&self`
5386 `@self`, and `~self` all generally work as expected
5387 * Static methods work in more situations
5388 * Experimental: Traits may declare default methods for the implementations
5392 * New condition handling system in `core::condition`
5393 * Timsort added to `std::sort`
5394 * New priority queue, `std::priority_queue`
5395 * Pipes for serializable types, `std::flatpipes'
5396 * Serialization overhauled to be trait-based
5397 * Expanded `getopts` definitions
5398 * Moved futures to `std`
5399 * More functions are pure now
5400 * `core::comm` renamed to `oldcomm`. Still deprecated
5401 * `rustdoc` and `cargo` are libraries now
5404 * Added a preliminary REPL, `rusti`
5405 * License changed from MIT to dual MIT/APL2
5408 Version 0.4 (2012-10-15)
5409 ==========================
5411 * ~2000 changes, numerous bugfixes
5414 * All keywords are now strict and may not be used as identifiers anywhere
5415 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
5416 'of', 'with', 'to', 'class'.
5417 * Classes are replaced with simpler structs
5418 * Explicit method self types
5419 * `ret` became `return` and `alt` became `match`
5420 * `import` is now `use`; `use is now `extern mod`
5421 * `extern mod { ... }` is now `extern { ... }`
5422 * `use mod` is the recommended way to import modules
5423 * `pub` and `priv` replace deprecated export lists
5424 * The syntax of `match` pattern arms now uses fat arrow (=>)
5425 * `main` no longer accepts an args vector; use `os::args` instead
5428 * Trait implementations are now coherent, ala Haskell typeclasses
5429 * Trait methods may be static
5430 * Argument modes are deprecated
5431 * Borrowed pointers are much more mature and recommended for use
5432 * Strings and vectors in the static region are stored in constant memory
5433 * Typestate was removed
5434 * Resolution rewritten to be more reliable
5435 * Support for 'dual-mode' data structures (freezing and thawing)
5438 * Most binary operators can now be overloaded via the traits in
5440 * `std::net::url` for representing URLs
5441 * Sendable hash maps in `core::send_map`
5442 * `core::task' gained a (currently unsafe) task-local storage API
5445 * An efficient new intertask communication primitive called the pipe,
5446 along with a number of higher-level channel types, in `core::pipes`
5447 * `std::arc`, an atomically reference counted, immutable, shared memory
5449 * `std::sync`, various exotic synchronization tools based on arcs and pipes
5450 * Futures are now based on pipes and sendable
5451 * More robust linked task failure
5452 * Improved task builder API
5455 * Improved error reporting
5456 * Preliminary JIT support
5457 * Preliminary work on precise GC
5458 * Extensive architectural improvements to rustc
5459 * Begun a transition away from buggy C++-based reflection (shape) code to
5460 Rust-based (visitor) code
5461 * All hash functions and tables converted to secure, randomized SipHash
5464 Version 0.3 (2012-07-12)
5465 ========================
5467 * ~1900 changes, numerous bugfixes
5469 * New coding conveniences
5470 * Integer-literal suffix inference
5471 * Per-item control over warnings, errors
5472 * #[cfg(windows)] and #[cfg(unix)] attributes
5473 * Documentation comments
5474 * More compact closure syntax
5475 * 'do' expressions for treating higher-order functions as
5477 * *-patterns (wildcard extended to all constructor fields)
5480 * Name resolution pass and exhaustiveness checker rewritten
5481 * Region pointers and borrow checking supersede alias
5483 * Init-ness checking is now provided by a region-based liveness
5484 pass instead of the typestate pass; same for last-use analysis
5485 * Extensive work on region pointers
5487 * Experimental new language features
5488 * Slices and fixed-size, interior-allocated vectors
5489 * #!-comments for lang versioning, shell execution
5490 * Destructors and iface implementation for classes;
5491 type-parameterized classes and class methods
5492 * 'const' type kind for types that can be used to implement
5493 shared-memory concurrency patterns
5497 * Removal of various obsolete features
5498 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
5499 'crust', 'native' (now 'extern'), 'cont' (now 'again')
5501 * Constructs: do-while loops ('do' repurposed), fn binding,
5502 resources (replaced by destructors)
5504 * Compiler reorganization
5505 * Syntax-layer of compiler split into separate crate
5506 * Clang (from LLVM project) integrated into build
5507 * Typechecker split into sub-modules
5510 * New time functions
5511 * Extension methods for many built-in types
5512 * Arc: atomic-refcount read-only / exclusive-use shared cells
5513 * Par: parallel map and search routines
5514 * Extensive work on libuv interface
5515 * Much vector code moved to libraries
5516 * Syntax extensions: #line, #col, #file, #mod, #stringify,
5517 #include, #include_str, #include_bin
5520 * Cargo automatically resolves dependencies
5523 Version 0.2 (2012-03-29)
5524 =========================
5526 * >1500 changes, numerous bugfixes
5528 * New docs and doc tooling
5530 * New port: FreeBSD x86_64
5532 * Compilation model enhancements
5533 * Generics now specialized, multiply instantiated
5534 * Functions now inlined across separate crates
5536 * Scheduling, stack and threading fixes
5537 * Noticeably improved message-passing performance
5538 * Explicit schedulers
5542 * Experimental new language features
5543 * Operator overloading
5547 * Various language extensions
5548 * C-callback function types: 'crust fn ...'
5549 * Infinite-loop construct: 'loop { ... }'
5550 * Shorten 'mutable' to 'mut'
5551 * Required mutable-local qualifier: 'let mut ...'
5552 * Basic glob-exporting: 'export foo::*;'
5553 * Alt now exhaustive, 'alt check' for runtime-checked
5554 * Block-function form of 'for' loop, with 'break' and 'ret'.
5557 * AST quasi-quote syntax extension
5558 * Revived libuv interface
5559 * New modules: core::{future, iter}, std::arena
5560 * Merged per-platform std::{os*, fs*} to core::{libc, os}
5561 * Extensive cleanup, regularization in libstd, libcore
5564 Version 0.1 (2012-01-20)
5565 ===============================
5567 * Most language features work, including:
5568 * Unique pointers, unique closures, move semantics
5569 * Interface-constrained generics
5570 * Static interface dispatch
5572 * Multithread task scheduling
5573 * Typestate predicates
5574 * Failure unwinding, destructors
5575 * Pattern matching and destructuring assignment
5576 * Lightweight block-lambda syntax
5577 * Preliminary macro-by-example
5579 * Compiler works with the following configurations:
5580 * Linux: x86 and x86_64 hosts and targets
5581 * macOS: x86 and x86_64 hosts and targets
5582 * Windows: x86 hosts and targets
5584 * Cross compilation / multi-target configuration supported.
5586 * Preliminary API-documentation and package-management tools included.
5590 * Documentation is incomplete.
5592 * Performance is below intended target.
5594 * Standard library APIs are subject to extensive change, reorganization.
5596 * Language-level versioning is not yet operational - future code will