1 Version 1.32.0 (2019-01-17)
2 ==========================
7 - [You can now use the `?` operator in macro definitions.][56245] The `?`
8 operator allows you to specify zero or one repetitions similar to the `*` and
10 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
11 now always resolve to the item (`enum`, `struct`, etc.) available in the
12 module if present, before resolving to a external crate or an item the prelude.][56759]
15 enum Color { Red, Green, Blue }
21 - [You can now match against `PhantomData<T>` types.][55837]
22 - [You can now match against literals in macros with the `literal`
23 specifier.][56072] This will match against a literal of any type.
24 E.g. `1`, `'A'`, `"Hello World"`
25 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
27 struct Point(i32, i32);
30 pub fn new(x: i32, y: i32) -> Self {
34 pub fn is_origin(&self) -> bool {
42 - [Self can also now be used in type definitions.][56366] E.g.
46 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
49 Cons(T, Box<Self>) // likewise here
52 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
53 a `impl Trait` or `dyn Trait` is returned and unused in the program.
57 - [The default allocator has changed from jemalloc to the default allocator on
58 your system.][55238] The compiler itself on Linux & macOS will still use
59 jemalloc, but programs compiled with it will use the system allocator.
60 - [Added the `aarch64-pc-windows-msvc` target.][55702]
64 - [`PathBuf` now implements `FromStr`.][55148]
65 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
66 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
67 easily debug expressions in your rust program. E.g.
70 let b = dbg!(a * 2) + 1;
71 // ^-- prints: [src/main.rs:4] a * 2 = 4
75 The following APIs are now `const` functions and can be used in a
82 - [`ManuallyDrop::new`]
83 - [`ManuallyDrop::into_inner`]
84 - [`RangeInclusive::start`]
85 - [`RangeInclusive::end`]
89 - [`Duration::as_secs`]
90 - [`Duration::subsec_millis`]
91 - [`Duration::subsec_micros`]
92 - [`Duration::subsec_nanos`]
94 - [`Ipv4Addr::is_unspecified`]
96 - [`Ipv6Addr::octets`]
100 - [`i8::to_be_bytes`]
101 - [`i8::to_le_bytes`]
102 - [`i8::to_ne_bytes`]
103 - [`i8::from_be_bytes`]
104 - [`i8::from_le_bytes`]
105 - [`i8::from_ne_bytes`]
106 - [`i16::to_be_bytes`]
107 - [`i16::to_le_bytes`]
108 - [`i16::to_ne_bytes`]
109 - [`i16::from_be_bytes`]
110 - [`i16::from_le_bytes`]
111 - [`i16::from_ne_bytes`]
112 - [`i32::to_be_bytes`]
113 - [`i32::to_le_bytes`]
114 - [`i32::to_ne_bytes`]
115 - [`i32::from_be_bytes`]
116 - [`i32::from_le_bytes`]
117 - [`i32::from_ne_bytes`]
118 - [`i64::to_be_bytes`]
119 - [`i64::to_le_bytes`]
120 - [`i64::to_ne_bytes`]
121 - [`i64::from_be_bytes`]
122 - [`i64::from_le_bytes`]
123 - [`i64::from_ne_bytes`]
124 - [`isize::to_be_bytes`]
125 - [`isize::to_le_bytes`]
126 - [`isize::to_ne_bytes`]
127 - [`isize::from_be_bytes`]
128 - [`isize::from_le_bytes`]
129 - [`isize::from_ne_bytes`]
130 - [`u8::to_be_bytes`]
131 - [`u8::to_le_bytes`]
132 - [`u8::to_ne_bytes`]
133 - [`u8::from_be_bytes`]
134 - [`u8::from_le_bytes`]
135 - [`u8::from_ne_bytes`]
136 - [`u16::to_be_bytes`]
137 - [`u16::to_le_bytes`]
138 - [`u16::to_ne_bytes`]
139 - [`u16::from_be_bytes`]
140 - [`u16::from_le_bytes`]
141 - [`u16::from_ne_bytes`]
142 - [`u32::to_be_bytes`]
143 - [`u32::to_le_bytes`]
144 - [`u32::to_ne_bytes`]
145 - [`u32::from_be_bytes`]
146 - [`u32::from_le_bytes`]
147 - [`u32::from_ne_bytes`]
148 - [`u64::to_be_bytes`]
149 - [`u64::to_le_bytes`]
150 - [`u64::to_ne_bytes`]
151 - [`u64::from_be_bytes`]
152 - [`u64::from_le_bytes`]
153 - [`u64::from_ne_bytes`]
154 - [`usize::to_be_bytes`]
155 - [`usize::to_le_bytes`]
156 - [`usize::to_ne_bytes`]
157 - [`usize::from_be_bytes`]
158 - [`usize::from_le_bytes`]
159 - [`usize::from_ne_bytes`]
163 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
164 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
168 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
172 - [The argument types for AVX's
173 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
174 been changed from `*const` to `*mut` as the previous implementation
178 [55148]: https://github.com/rust-lang/rust/pull/55148/
179 [55238]: https://github.com/rust-lang/rust/pull/55238/
180 [55280]: https://github.com/rust-lang/rust/pull/55280/
181 [55610]: https://github.com/rust-lang/rust/pull/55610/
182 [55663]: https://github.com/rust-lang/rust/pull/55663/
183 [55702]: https://github.com/rust-lang/rust/pull/55702/
184 [55837]: https://github.com/rust-lang/rust/pull/55837/
185 [55843]: https://github.com/rust-lang/rust/pull/55843/
186 [56072]: https://github.com/rust-lang/rust/pull/56072/
187 [56245]: https://github.com/rust-lang/rust/pull/56245/
188 [56365]: https://github.com/rust-lang/rust/pull/56365/
189 [56366]: https://github.com/rust-lang/rust/pull/56366/
190 [56395]: https://github.com/rust-lang/rust/pull/56395/
191 [56759]: https://github.com/rust-lang/rust/pull/56759/
192 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
193 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
194 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
195 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
196 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
197 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
198 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
199 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
200 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
201 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
202 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
203 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
204 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
205 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
206 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
207 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
208 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
209 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
210 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
211 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
212 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
213 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
214 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
215 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
216 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
217 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
218 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
219 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
220 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
221 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
222 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
223 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
224 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
225 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
226 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
227 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
228 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
229 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
230 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
231 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
232 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
233 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
234 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
235 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
236 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
237 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
238 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
239 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
240 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
241 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
242 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
243 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
244 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
245 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
246 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
247 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
248 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
249 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
250 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
251 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
252 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
253 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
254 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
255 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
256 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
257 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
258 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
259 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
260 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
261 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
262 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
263 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
264 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
265 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
266 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
267 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
268 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
269 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
270 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
271 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
272 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
275 Version 1.31.1 (2018-12-20)
276 ===========================
278 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
279 - [Fix broken go-to-definition in RLS][rls/1171]
280 - [Fix infinite loop on hover in RLS][rls/1170]
282 [56562]: https://github.com/rust-lang/rust/pull/56562
283 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
284 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
286 Version 1.31.0 (2018-12-06)
287 ==========================
291 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
292 - [New lifetime elision rules now allow for eliding lifetimes in functions and
293 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
294 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
296 - [You can now define and use `const` functions.][54835] These are currently
297 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
298 [language reference][const-reference] for what exactly is available.
299 - [You can now use tool lints, which allow you to scope lints from external
300 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
301 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
302 a crate, not just in exported functions.][54451]
303 - [You can now use parentheses in pattern matches.][54497]
307 - [Updated musl to 1.1.20][54430]
311 - [You can now convert `num::NonZero*` types to their raw equivalvents using the
312 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
313 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
314 into `Option<&mut T>` using the `From` trait.][53218]
315 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
320 - [`slice::align_to`]
321 - [`slice::align_to_mut`]
322 - [`slice::chunks_exact`]
323 - [`slice::chunks_exact_mut`]
325 - [`slice::rchunks_mut`]
326 - [`slice::rchunks_exact`]
327 - [`slice::rchunks_exact_mut`]
328 - [`Option::replace`]
332 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
333 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
334 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
336 [52813]: https://github.com/rust-lang/rust/pull/52813/
337 [53218]: https://github.com/rust-lang/rust/pull/53218/
338 [53555]: https://github.com/rust-lang/rust/issues/53555/
339 [54057]: https://github.com/rust-lang/rust/pull/54057/
340 [54240]: https://github.com/rust-lang/rust/pull/54240/
341 [54430]: https://github.com/rust-lang/rust/pull/54430/
342 [54451]: https://github.com/rust-lang/rust/pull/54451/
343 [54497]: https://github.com/rust-lang/rust/pull/54497/
344 [54778]: https://github.com/rust-lang/rust/pull/54778/
345 [54835]: https://github.com/rust-lang/rust/pull/54835/
346 [54870]: https://github.com/rust-lang/rust/pull/54870/
347 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
348 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
349 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
350 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
351 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
352 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
353 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
354 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
355 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
356 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
357 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
358 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
359 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
360 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
362 Version 1.30.1 (2018-11-08)
363 ===========================
365 - [Fixed overflow ICE in rustdoc][54199]
366 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
368 [54199]: https://github.com/rust-lang/rust/pull/54199
369 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
371 Version 1.30.0 (2018-10-25)
372 ==========================
376 - [Procedural macros are now available.][52081] These kinds of macros allow for
377 more powerful code generation. There is a [new chapter available][proc-macros]
378 in the Rust Programming Language book that goes further in depth.
379 - [You can now use keywords as identifiers using the raw identifiers
380 syntax (`r#`),][53236] e.g. `let r#for = true;`
381 - [Using anonymous parameters in traits is now deprecated with a warning and
382 will be a hard error in the 2018 edition.][53272]
383 - [You can now use `crate` in paths.][54404] This allows you to refer to the
384 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
385 - [Using a external crate no longer requires being prefixed with `::`.][54404]
386 Previously, using a external crate in a module without a use statement
387 required `let json = ::serde_json::from_str(foo);` but can now be written
388 as `let json = serde_json::from_str(foo);`.
389 - [You can now apply the `#[used]` attribute to static items to prevent the
390 compiler from optimising them away, even if they appear to be unused,][51363]
391 e.g. `#[used] static FOO: u32 = 1;`
392 - [You can now import and reexport macros from other crates with the `use`
393 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
394 the root module of the crate. If your macro relies on calling other local
395 macros, it is recommended to export with the
396 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
398 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
399 using the `vis` specifier.][53370]
400 - [Non-macro attributes now allow all forms of literals, not just
401 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
402 write `#[attr(true)]`.
403 - [You can now specify a function to handle a panic in the Rust runtime with the
404 `#[panic_handler]` attribute.][51366]
408 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
409 - [Added the `aarch64-unknown-netbsd` target][53165]
413 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
417 - [`Ipv4Addr::BROADCAST`]
418 - [`Ipv4Addr::LOCALHOST`]
419 - [`Ipv4Addr::UNSPECIFIED`]
420 - [`Ipv6Addr::LOCALHOST`]
421 - [`Ipv6Addr::UNSPECIFIED`]
422 - [`Iterator::find_map`]
424 The following methods are replacement methods for `trim_left`, `trim_right`,
425 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
427 - [`str::trim_end_matches`]
429 - [`str::trim_start_matches`]
430 - [`str::trim_start`]
434 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
435 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
436 equivalent to calling `rustdoc --error-format=json`.
437 - [Cargo will now provide a progress bar for builds.][cargo/5995]
441 - [`rustdoc` allows you to specify what edition to treat your code as with the
442 `--edition` option.][54057]
443 - [`rustdoc` now has the `--color` (specify whether to output color) and
444 `--error-format` (specify error format, e.g. `json`) options.][53003]
445 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
446 debug symbols.][53774]
447 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
448 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
450 [50911]: https://github.com/rust-lang/rust/pull/50911/
451 [51363]: https://github.com/rust-lang/rust/pull/51363/
452 [51366]: https://github.com/rust-lang/rust/pull/51366/
453 [52081]: https://github.com/rust-lang/rust/pull/52081/
454 [53003]: https://github.com/rust-lang/rust/pull/53003/
455 [53033]: https://github.com/rust-lang/rust/pull/53033/
456 [53044]: https://github.com/rust-lang/rust/pull/53044/
457 [53165]: https://github.com/rust-lang/rust/pull/53165/
458 [53213]: https://github.com/rust-lang/rust/pull/53213/
459 [53236]: https://github.com/rust-lang/rust/pull/53236/
460 [53272]: https://github.com/rust-lang/rust/pull/53272/
461 [53370]: https://github.com/rust-lang/rust/pull/53370/
462 [53459]: https://github.com/rust-lang/rust/pull/53459/
463 [53774]: https://github.com/rust-lang/rust/pull/53774/
464 [53822]: https://github.com/rust-lang/rust/pull/53822/
465 [54057]: https://github.com/rust-lang/rust/pull/54057/
466 [54146]: https://github.com/rust-lang/rust/pull/54146/
467 [54404]: https://github.com/rust-lang/rust/pull/54404/
468 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
469 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
470 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
471 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
473 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
474 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
475 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
476 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
477 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
478 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
479 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
480 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
481 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
482 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
485 Version 1.29.2 (2018-10-11)
486 ===========================
488 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
489 - The `rls-preview` component on the windows-gnu targets has been restored.
491 [54639]: https://github.com/rust-lang/rust/pull/54639
494 Version 1.29.1 (2018-09-25)
495 ===========================
500 - The standard library's `str::repeat` function contained an out of bounds write
501 caused by an integer overflow. This has been fixed by deterministically
502 panicking when an overflow happens.
504 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
508 Version 1.29.0 (2018-09-13)
509 ==========================
513 - [Bumped minimum LLVM version to 5.0.][51899]
514 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
515 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
519 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
520 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
521 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
522 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
524 - [`Cell<T>` now allows `T` to be unsized.][50494]
525 - [`SocketAddr` is now stable on Redox.][52656]
530 - [`Iterator::flatten`]
535 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
536 `--locked` to disable this behavior.
537 - [`cargo-install` will now allow you to cross compile an install
538 using `--target`.][cargo/5614]
539 - [Added the `cargo-fix` subcommand to automatically move project code from
540 2015 edition to 2018.][cargo/5723]
541 - [`cargo doc` can now optionally document private types using the
542 `--document-private-items` flag.][cargo/5543]
546 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
547 the specified level to that level.][52354] For example `--cap-lints warn`
548 will demote `deny` and `forbid` lints to `warn`.
549 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
550 fails and `101` if there is a panic.][52197]
551 - [A preview of clippy has been made available through rustup.][51122]
552 You can install the preview with `rustup component add clippy-preview`.
556 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
557 Use `str::get_unchecked(begin..end)` instead.
558 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
559 Consider using the `home_dir` function from
560 https://crates.io/crates/dirs instead.
561 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
562 - [`cfg` attributes and `--cfg` command line flags are now more
563 strictly validated.][53893]
565 [53893]: https://github.com/rust-lang/rust/pull/53893/
566 [52861]: https://github.com/rust-lang/rust/pull/52861/
567 [52656]: https://github.com/rust-lang/rust/pull/52656/
568 [52239]: https://github.com/rust-lang/rust/pull/52239/
569 [52330]: https://github.com/rust-lang/rust/pull/52330/
570 [52354]: https://github.com/rust-lang/rust/pull/52354/
571 [52402]: https://github.com/rust-lang/rust/pull/52402/
572 [52103]: https://github.com/rust-lang/rust/pull/52103/
573 [52197]: https://github.com/rust-lang/rust/pull/52197/
574 [51807]: https://github.com/rust-lang/rust/pull/51807/
575 [51899]: https://github.com/rust-lang/rust/pull/51899/
576 [51912]: https://github.com/rust-lang/rust/pull/51912/
577 [51511]: https://github.com/rust-lang/rust/pull/51511/
578 [51619]: https://github.com/rust-lang/rust/pull/51619/
579 [51656]: https://github.com/rust-lang/rust/pull/51656/
580 [51178]: https://github.com/rust-lang/rust/pull/51178/
581 [51122]: https://github.com/rust-lang/rust/pull/51122
582 [50494]: https://github.com/rust-lang/rust/pull/50494/
583 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
584 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
585 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
586 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
587 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
588 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
589 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
592 Version 1.28.0 (2018-08-02)
593 ===========================
597 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
598 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
599 the inner type across Foreign Function Interface (FFI) boundaries.
600 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
601 and can now be used as identifiers.][51196]
602 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
603 stable.][51241] This will allow users to specify a global allocator for
605 - [Unit test functions marked with the `#[test]` attribute can now return
606 `Result<(), E: Debug>` in addition to `()`.][51298]
607 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
608 allows macros to easily target lifetimes.
612 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
613 prioritise making smaller binary sizes. `z` is the same as `s` with the
614 exception that it does not vectorise loops, which typically results in an even
616 - [The short error format is now stable.][49546] Specified with
617 `--error-format=short` this option will provide a more compressed output of
619 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
620 - [Reduced the number of allocations in the macro parser.][50855] This can
621 improve compile times of macro heavy crates on average by 5%.
625 - [Implemented `Default` for `&mut str`.][51306]
626 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
627 - [Implemented `Extend` for `()`.][50234]
628 - [The `Debug` implementation of `time::Duration` should now be more easily
629 human readable.][50364] Previously a `Duration` of one second would printed as
630 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
631 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
632 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
633 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
634 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
635 for `PathBuf`.][50170]
636 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
637 and `Wrapping<i128>`.][50465]
638 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
639 possible.][51050] This can provide up to a 40% speed increase.
640 - [Improved error messages when using `format!`.][50610]
644 - [`Iterator::step_by`]
645 - [`Path::ancestors`]
646 - [`SystemTime::UNIX_EPOCH`]
647 - [`alloc::GlobalAlloc`]
649 - [`alloc::LayoutErr`]
652 - [`alloc::alloc_zeroed`]
655 - [`alloc::handle_alloc_error`]
656 - [`btree_map::Entry::or_default`]
658 - [`hash_map::Entry::or_default`]
659 - [`iter::repeat_with`]
660 - [`num::NonZeroUsize`]
661 - [`num::NonZeroU128`]
662 - [`num::NonZeroU16`]
663 - [`num::NonZeroU32`]
664 - [`num::NonZeroU64`]
666 - [`ops::RangeBounds`]
667 - [`slice::SliceIndex`]
668 - [`slice::from_mut`]
669 - [`slice::from_ref`]
670 - [`{Any + Send + Sync}::downcast_mut`]
671 - [`{Any + Send + Sync}::downcast_ref`]
672 - [`{Any + Send + Sync}::is`]
676 - [Cargo will now no longer allow you to publish crates with build scripts that
677 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
678 considered to be immutable.
682 - [The `suggestion_applicability` field in `rustc`'s json output is now
683 stable.][50486] This will allow dev tools to check whether a code suggestion
688 - [Rust will consider trait objects with duplicated constraints to be the same
689 type as without the duplicated constraint.][51276] For example the below code will
695 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
698 impl Trait + Send + Send {
699 fn test(&self) { println!("two"); }
703 [49546]: https://github.com/rust-lang/rust/pull/49546/
704 [50143]: https://github.com/rust-lang/rust/pull/50143/
705 [50170]: https://github.com/rust-lang/rust/pull/50170/
706 [50234]: https://github.com/rust-lang/rust/pull/50234/
707 [50265]: https://github.com/rust-lang/rust/pull/50265/
708 [50364]: https://github.com/rust-lang/rust/pull/50364/
709 [50385]: https://github.com/rust-lang/rust/pull/50385/
710 [50465]: https://github.com/rust-lang/rust/pull/50465/
711 [50486]: https://github.com/rust-lang/rust/pull/50486/
712 [50554]: https://github.com/rust-lang/rust/pull/50554/
713 [50610]: https://github.com/rust-lang/rust/pull/50610/
714 [50855]: https://github.com/rust-lang/rust/pull/50855/
715 [51050]: https://github.com/rust-lang/rust/pull/51050/
716 [51196]: https://github.com/rust-lang/rust/pull/51196/
717 [51200]: https://github.com/rust-lang/rust/pull/51200/
718 [51241]: https://github.com/rust-lang/rust/pull/51241/
719 [51276]: https://github.com/rust-lang/rust/pull/51276/
720 [51298]: https://github.com/rust-lang/rust/pull/51298/
721 [51306]: https://github.com/rust-lang/rust/pull/51306/
722 [51562]: https://github.com/rust-lang/rust/pull/51562/
723 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
724 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
725 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
726 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
727 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
728 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
729 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
730 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
731 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
732 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
733 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
734 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
735 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
736 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
737 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
738 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
739 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
740 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
741 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
742 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
743 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
744 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
745 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
746 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
747 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
748 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
749 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
750 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
751 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
752 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
754 Version 1.27.2 (2018-07-20)
755 ===========================
760 - The borrow checker was fixed to avoid potential unsoundness when using
761 match ergonomics: [#52213][52213].
763 [52213]: https://github.com/rust-lang/rust/issues/52213
765 Version 1.27.1 (2018-07-10)
766 ===========================
771 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
772 when running, which enabled executing code as some other user on a
773 given machine. This release fixes that vulnerability; you can read
774 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
776 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
781 - The borrow checker was fixed to avoid an additional potential unsoundness when using
782 match ergonomics: [#51415][51415], [#49534][49534].
784 [51415]: https://github.com/rust-lang/rust/issues/51415
785 [49534]: https://github.com/rust-lang/rust/issues/49534
786 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
787 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
789 Version 1.27.0 (2018-06-21)
790 ==========================
794 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
795 be used as an identifier.
796 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
797 bare `Trait` syntax, and should make it clearer when being used in tandem with
798 `impl Trait` because it is equivalent to the following syntax:
799 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
800 `Box<Trait> == Box<dyn Trait>`.
801 - [Attributes on generic parameters such as types and lifetimes are
802 now stable.][48851] e.g.
803 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
804 - [The `#[must_use]` attribute can now also be used on functions as well as
805 types.][48925] It provides a lint that by default warns users when the
806 value returned by a function has not been used.
810 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
814 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
815 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
816 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
817 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
819 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
820 std are now available in core.][49896]
821 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
823 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
824 that the operation isn't done in place.
825 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
826 the `#[must_use]` attribute][49533] to warn about unused potentially
827 expensive allocations.
831 - [`DoubleEndedIterator::rfind`]
832 - [`DoubleEndedIterator::rfold`]
833 - [`DoubleEndedIterator::try_rfold`]
834 - [`Duration::from_micros`]
835 - [`Duration::from_nanos`]
836 - [`Duration::subsec_micros`]
837 - [`Duration::subsec_millis`]
838 - [`HashMap::remove_entry`]
839 - [`Iterator::try_fold`]
840 - [`Iterator::try_for_each`]
843 - [`String::replace_range`]
844 - [`Take::set_limit`]
845 - [`hint::unreachable_unchecked`]
846 - [`os::unix::process::parent_id`]
847 - [`ptr::swap_nonoverlapping`]
848 - [`slice::rsplit_mut`]
850 - [`slice::swap_with_slice`]
854 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
855 `readme`, and `repository` fields.][cargo/5386]
856 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
857 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
858 a different directory than `target` for placing compilation artifacts.
859 - [Cargo will be adding automatic target inference for binaries, benchmarks,
860 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
861 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
862 where cargo would infer a binary, Cargo will produce a warning. You can
863 disable this feature ahead of time by setting any of the following to false:
864 `autobins`, `autobenches`, `autoexamples`, `autotests`.
865 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
866 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
870 - [Added “The Rustc book” into the official documentation.][49707]
871 [“The Rustc book”] documents and teaches how to use the rustc compiler.
872 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
876 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
877 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
878 compile, `"".is_empty()` will still compile.
879 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
880 will only print the inner type.][48553] E.g.
881 `print!("{:?}", AtomicBool::new(true))` will print `true`,
882 not `AtomicBool(true)`.
883 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
884 could enter higher numbers but they were not supported by LLVM. Up to 512MB
885 alignment should cover all use cases.
886 - The `.description()` method on the `std::error::Error` trait
887 [has been soft-deprecated][50163]. It is no longer required to implement it.
889 [48553]: https://github.com/rust-lang/rust/pull/48553/
890 [48851]: https://github.com/rust-lang/rust/pull/48851/
891 [48925]: https://github.com/rust-lang/rust/pull/48925/
892 [49533]: https://github.com/rust-lang/rust/pull/49533/
893 [49623]: https://github.com/rust-lang/rust/pull/49623/
894 [49630]: https://github.com/rust-lang/rust/pull/49630/
895 [49664]: https://github.com/rust-lang/rust/pull/49664/
896 [49699]: https://github.com/rust-lang/rust/pull/49699/
897 [49707]: https://github.com/rust-lang/rust/pull/49707/
898 [49719]: https://github.com/rust-lang/rust/pull/49719/
899 [49896]: https://github.com/rust-lang/rust/pull/49896/
900 [49968]: https://github.com/rust-lang/rust/pull/49968/
901 [50163]: https://github.com/rust-lang/rust/pull/50163
902 [50177]: https://github.com/rust-lang/rust/pull/50177/
903 [50378]: https://github.com/rust-lang/rust/pull/50378/
904 [50398]: https://github.com/rust-lang/rust/pull/50398/
905 [50423]: https://github.com/rust-lang/rust/pull/50423/
906 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
907 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
908 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
909 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
910 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
911 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
912 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
913 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
914 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
915 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
916 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
917 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
918 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
919 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
920 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
921 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
922 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
923 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
924 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
925 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
926 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
927 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
928 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
929 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
930 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
931 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
932 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
933 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
934 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
935 [“The Rustc book”]: https://doc.rust-lang.org/rustc
938 Version 1.26.2 (2018-06-05)
939 ==========================
944 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
946 [51117]: https://github.com/rust-lang/rust/issues/51117
949 Version 1.26.1 (2018-05-29)
950 ==========================
955 - [RLS now works on Windows.][50646]
956 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
962 - [`fn main() -> impl Trait` no longer works for non-Termination
964 This reverts an accidental stabilization.
965 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
966 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
968 [50646]: https://github.com/rust-lang/rust/issues/50646
969 [50656]: https://github.com/rust-lang/rust/pull/50656
970 [50812]: https://github.com/rust-lang/rust/pull/50812
971 [50950]: https://github.com/rust-lang/rust/issues/50950
972 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
974 Version 1.26.0 (2018-05-10)
975 ==========================
979 - [Closures now implement `Copy` and/or `Clone` if all captured variables
980 implement either or both traits.][49299]
981 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
982 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
983 lifetime can be elided.][49458]
984 - [`impl Trait` is now stable allowing you to have abstract types in returns
985 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
986 `fn open(path: impl AsRef<Path>)`.
987 - [Pattern matching will now automatically apply dereferences.][49394]
988 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
989 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
990 - [A lot of operations are now available in a const context.][46882] E.g. You
991 can now index into constant arrays, reference and dereference into constants,
992 and use tuple struct constructors.
993 - [Fixed entry slice patterns are now stable.][48516] E.g.
995 let points = [1, 2, 3, 4];
997 [1, 2, 3, 4] => println!("All points were sequential."),
998 _ => println!("Not all points were sequential."),
1005 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
1006 - [Fixed exponential projection complexity on nested types.][48296]
1007 This can provide up to a ~12% reduction in compile times for certain crates.
1008 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
1009 to remap path prefixes outputted by the compiler.
1010 - [Added `powerpc-unknown-netbsd` target.][48281]
1014 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1015 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1016 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1017 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1018 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1019 - [`ascii::escape_default` is now available in libcore.][48735]
1020 - [Trailing commas are now supported in std and core macros.][48056]
1021 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1022 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1027 - [`*const T::copy_to_nonoverlapping`]
1028 - [`*const T::copy_to`]
1029 - [`*const T::read_unaligned`]
1030 - [`*const T::read_volatile`]
1031 - [`*const T::read`]
1033 - [`*const T::wrapping_add`]
1034 - [`*const T::wrapping_sub`]
1036 - [`*mut T::copy_to_nonoverlapping`]
1037 - [`*mut T::copy_to`]
1038 - [`*mut T::read_unaligned`]
1039 - [`*mut T::read_volatile`]
1041 - [`*mut T::replace`]
1044 - [`*mut T::wrapping_add`]
1045 - [`*mut T::wrapping_sub`]
1046 - [`*mut T::write_bytes`]
1047 - [`*mut T::write_unaligned`]
1048 - [`*mut T::write_volatile`]
1051 - [`FromUtf8Error::as_bytes`]
1052 - [`LocalKey::try_with`]
1053 - [`Option::cloned`]
1054 - [`btree_map::Entry::and_modify`]
1055 - [`fs::read_to_string`]
1058 - [`hash_map::Entry::and_modify`]
1059 - [`iter::FusedIterator`]
1060 - [`ops::RangeInclusive`]
1061 - [`ops::RangeToInclusive`]
1063 - [`slice::rotate_left`]
1064 - [`slice::rotate_right`]
1065 - [`String::retain`]
1070 - [Cargo will now output path to custom commands when `-v` is
1071 passed with `--list`][cargo/5041]
1072 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1076 - [The second edition of "The Rust Programming Language" book is now recommended
1077 over the first.][48404]
1082 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1083 syntax is now invalid.
1085 use std::ops::Fn as dyn;
1086 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1088 - [The result of dereferences are no longer promoted to `'static`.][47408]
1092 const PAIR: &(i32, i32) = &(0, 1);
1093 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1096 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1097 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1099 - [Removed hoedown from rustdoc.][48274]
1100 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1102 [46882]: https://github.com/rust-lang/rust/pull/46882
1103 [47379]: https://github.com/rust-lang/rust/pull/47379
1104 [47408]: https://github.com/rust-lang/rust/pull/47408
1105 [47813]: https://github.com/rust-lang/rust/pull/47813
1106 [48056]: https://github.com/rust-lang/rust/pull/48056
1107 [48125]: https://github.com/rust-lang/rust/pull/48125
1108 [48166]: https://github.com/rust-lang/rust/pull/48166
1109 [48235]: https://github.com/rust-lang/rust/pull/48235
1110 [48274]: https://github.com/rust-lang/rust/pull/48274
1111 [48281]: https://github.com/rust-lang/rust/pull/48281
1112 [48296]: https://github.com/rust-lang/rust/pull/48296
1113 [48326]: https://github.com/rust-lang/rust/pull/48326
1114 [48359]: https://github.com/rust-lang/rust/pull/48359
1115 [48404]: https://github.com/rust-lang/rust/pull/48404
1116 [48481]: https://github.com/rust-lang/rust/pull/48481
1117 [48516]: https://github.com/rust-lang/rust/pull/48516
1118 [48628]: https://github.com/rust-lang/rust/pull/48628
1119 [48629]: https://github.com/rust-lang/rust/pull/48629
1120 [48657]: https://github.com/rust-lang/rust/pull/48657
1121 [48735]: https://github.com/rust-lang/rust/pull/48735
1122 [48978]: https://github.com/rust-lang/rust/pull/48978
1123 [49101]: https://github.com/rust-lang/rust/pull/49101
1124 [49109]: https://github.com/rust-lang/rust/pull/49109
1125 [49121]: https://github.com/rust-lang/rust/pull/49121
1126 [49162]: https://github.com/rust-lang/rust/pull/49162
1127 [49184]: https://github.com/rust-lang/rust/pull/49184
1128 [49234]: https://github.com/rust-lang/rust/pull/49234
1129 [49255]: https://github.com/rust-lang/rust/pull/49255
1130 [49299]: https://github.com/rust-lang/rust/pull/49299
1131 [49305]: https://github.com/rust-lang/rust/pull/49305
1132 [49394]: https://github.com/rust-lang/rust/pull/49394
1133 [49458]: https://github.com/rust-lang/rust/pull/49458
1134 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
1135 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
1136 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
1137 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
1138 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
1139 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
1140 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
1141 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
1142 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
1143 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
1144 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
1145 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
1146 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
1147 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
1148 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
1149 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
1150 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
1151 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
1152 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
1153 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
1154 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
1155 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
1156 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
1157 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
1158 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
1159 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
1160 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
1161 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
1162 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
1163 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
1164 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
1165 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
1166 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
1167 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
1168 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
1169 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
1170 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1171 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
1172 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
1173 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
1174 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
1175 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
1178 Version 1.25.0 (2018-03-29)
1179 ==========================
1183 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
1184 - [You can now use nested groups of imports.][47948]
1185 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
1186 - [You can now have `|` at the start of a match arm.][47947] e.g.
1188 enum Foo { A, B, C }
1194 | Foo::B => println!("AB"),
1195 | Foo::C => println!("C"),
1202 - [Upgraded to LLVM 6.][47828]
1203 - [Added `-C lto=val` option.][47521]
1204 - [Added `i586-unknown-linux-musl` target][47282]
1208 - [Impl Send for `process::Command` on Unix.][47760]
1209 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
1210 - [`UnsafeCell::into_inner` is now safe.][47204]
1211 - [Implement libstd for CloudABI.][47268]
1212 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
1213 - [Implement `AsRef<Path>` for Component][46985]
1214 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
1215 - [Moved `Duration` to libcore.][46666]
1219 - [`Location::column`]
1222 The following functions can now be used in a constant expression.
1223 eg. `static MINUTE: Duration = Duration::from_secs(60);`
1224 - [`Duration::new`][47300]
1225 - [`Duration::from_secs`][47300]
1226 - [`Duration::from_millis`][47300]
1230 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
1231 - [`cargo new` now defaults to creating a binary crate, instead of a
1232 library crate.][cargo/5029]
1236 - [Rust by example is now shipped with new releases][46196]
1240 - [Deprecated `net::lookup_host`.][47510]
1241 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
1242 - The borrow checker was sometimes incorrectly permitting overlapping borrows
1243 around indexing operations (see [#47349][47349]). This has been fixed (which also
1244 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
1245 - [Removed deprecated unstable attribute `#[simd]`.][47251]
1247 [33903]: https://github.com/rust-lang/rust/pull/33903
1248 [47947]: https://github.com/rust-lang/rust/pull/47947
1249 [47948]: https://github.com/rust-lang/rust/pull/47948
1250 [47760]: https://github.com/rust-lang/rust/pull/47760
1251 [47790]: https://github.com/rust-lang/rust/pull/47790
1252 [47828]: https://github.com/rust-lang/rust/pull/47828
1253 [47398]: https://github.com/rust-lang/rust/pull/47398
1254 [47510]: https://github.com/rust-lang/rust/pull/47510
1255 [47521]: https://github.com/rust-lang/rust/pull/47521
1256 [47204]: https://github.com/rust-lang/rust/pull/47204
1257 [47251]: https://github.com/rust-lang/rust/pull/47251
1258 [47268]: https://github.com/rust-lang/rust/pull/47268
1259 [47282]: https://github.com/rust-lang/rust/pull/47282
1260 [47300]: https://github.com/rust-lang/rust/pull/47300
1261 [47349]: https://github.com/rust-lang/rust/pull/47349
1262 [46931]: https://github.com/rust-lang/rust/pull/46931
1263 [46985]: https://github.com/rust-lang/rust/pull/46985
1264 [47006]: https://github.com/rust-lang/rust/pull/47006
1265 [46830]: https://github.com/rust-lang/rust/pull/46830
1266 [46095]: https://github.com/rust-lang/rust/pull/46095
1267 [46666]: https://github.com/rust-lang/rust/pull/46666
1268 [46196]: https://github.com/rust-lang/rust/pull/46196
1269 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
1270 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
1271 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
1272 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
1273 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
1276 Version 1.24.1 (2018-03-01)
1277 ==========================
1279 - [Do not abort when unwinding through FFI][48251]
1280 - [Emit UTF-16 files for linker arguments on Windows][48318]
1281 - [Make the error index generator work again][48308]
1282 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
1284 [48251]: https://github.com/rust-lang/rust/issues/48251
1285 [48308]: https://github.com/rust-lang/rust/issues/48308
1286 [48318]: https://github.com/rust-lang/rust/issues/48318
1287 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
1290 Version 1.24.0 (2018-02-15)
1291 ==========================
1295 - [External `sysv64` ffi is now available.][46528]
1296 eg. `extern "sysv64" fn foo () {}`
1300 - [rustc now uses 16 codegen units by default for release builds.][46910]
1301 For the fastest builds, utilize `codegen-units=1`.
1302 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
1303 - [Add `aarch64-unknown-openbsd` support][46760]
1307 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
1308 improvement in performance in the majority of cases.
1309 - [`OsStr`'s `Debug` implementation is now lossless and consistent
1310 with Windows.][46798]
1311 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
1312 - [impl `From<bool>` for `AtomicBool`][46293]
1313 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
1314 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
1315 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
1316 - [float::from_bits now just uses transmute.][46012] This provides
1317 some optimisations from LLVM.
1318 - [Copied `AsciiExt` methods onto `char`][46077]
1319 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
1320 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
1321 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
1322 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
1326 - [`RefCell::replace`]
1328 - [`atomic::spin_loop_hint`]
1330 The following functions can now be used in a constant expression.
1331 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
1333 - [`AtomicBool::new`][46287]
1334 - [`AtomicUsize::new`][46287]
1335 - [`AtomicIsize::new`][46287]
1336 - [`AtomicPtr::new`][46287]
1337 - [`Cell::new`][46287]
1338 - [`{integer}::min_value`][46287]
1339 - [`{integer}::max_value`][46287]
1340 - [`mem::size_of`][46287]
1341 - [`mem::align_of`][46287]
1342 - [`ptr::null`][46287]
1343 - [`ptr::null_mut`][46287]
1344 - [`RefCell::new`][46287]
1345 - [`UnsafeCell::new`][46287]
1349 - [Added a `workspace.default-members` config that
1350 overrides implied `--all` in virtual workspaces.][cargo/4743]
1351 - [Enable incremental by default on development builds.][cargo/4817] Also added
1352 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
1353 per-project or global basis respectively.
1360 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
1361 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
1362 in accordance with IETF RFC 4291 §2.2.
1363 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
1364 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
1365 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1366 - [Leading zeros in tuple struct members is now an error][47084]
1367 - [`column!()` macro is one-based instead of zero-based][46977]
1368 - [`fmt::Arguments` can no longer be shared across threads][45198]
1369 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1370 - [Cargo sets a different working directory for the compiler][cargo/4788]
1372 [44884]: https://github.com/rust-lang/rust/pull/44884
1373 [45198]: https://github.com/rust-lang/rust/pull/45198
1374 [45506]: https://github.com/rust-lang/rust/pull/45506
1375 [45904]: https://github.com/rust-lang/rust/pull/45904
1376 [45990]: https://github.com/rust-lang/rust/pull/45990
1377 [46012]: https://github.com/rust-lang/rust/pull/46012
1378 [46077]: https://github.com/rust-lang/rust/pull/46077
1379 [46094]: https://github.com/rust-lang/rust/pull/46094
1380 [46284]: https://github.com/rust-lang/rust/pull/46284
1381 [46287]: https://github.com/rust-lang/rust/pull/46287
1382 [46293]: https://github.com/rust-lang/rust/pull/46293
1383 [46528]: https://github.com/rust-lang/rust/pull/46528
1384 [46671]: https://github.com/rust-lang/rust/pull/46671
1385 [46713]: https://github.com/rust-lang/rust/pull/46713
1386 [46735]: https://github.com/rust-lang/rust/pull/46735
1387 [46749]: https://github.com/rust-lang/rust/pull/46749
1388 [46760]: https://github.com/rust-lang/rust/pull/46760
1389 [46798]: https://github.com/rust-lang/rust/pull/46798
1390 [46828]: https://github.com/rust-lang/rust/pull/46828
1391 [46831]: https://github.com/rust-lang/rust/pull/46831
1392 [46833]: https://github.com/rust-lang/rust/pull/46833
1393 [46910]: https://github.com/rust-lang/rust/pull/46910
1394 [46977]: https://github.com/rust-lang/rust/pull/46977
1395 [47018]: https://github.com/rust-lang/rust/pull/47018
1396 [47080]: https://github.com/rust-lang/rust/pull/47080
1397 [47084]: https://github.com/rust-lang/rust/pull/47084
1398 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1399 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1400 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1401 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1402 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1403 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1406 Version 1.23.0 (2018-01-04)
1407 ==========================
1411 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1412 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1413 Which should fix some confusing errors in some operations.
1417 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1418 undefined behavior.][45920]
1419 - [rustc now suggests renaming import if names clash.][45660]
1420 - [Display errors/warnings correctly when there are zero-width or
1421 wide characters.][45711]
1422 - [rustc now avoids unnecessary copies of arguments that are
1423 simple bindings][45380] This should improve memory usage on average by 5-10%.
1424 - [Updated musl used to build musl rustc to 1.1.17][45393]
1428 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1429 - [Implement Hash for raw pointers to unsized types][45483]
1430 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1431 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1432 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1433 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1434 and `<*mut T>::as_mut`][44932]
1435 - [Optimized `Thread::{park, unpark}` implementation][45524]
1436 - [Improved `SliceExt::binary_search` performance.][45333]
1437 - [impl `FromIterator<()>` for `()`][45379]
1438 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1446 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1447 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1448 - [Added unit test checking to `cargo check`][cargo/4592]
1449 - [Cargo now lets you install a specific version
1450 using `cargo install --version`][cargo/4637]
1454 - [Releases now ship with the Cargo book documentation.][45692]
1455 - [rustdoc now prints rendering warnings on every run.][45324]
1459 - [Changes have been made to type equality to make it more correct,
1460 in rare cases this could break some code.][45853] [Tracking issue for
1461 further information][45852]
1462 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1463 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1464 Android 9, the minimum supported version is Android 14.
1465 - [Bumped the minimum LLVM to 3.9][45326]
1467 [44042]: https://github.com/rust-lang/rust/pull/44042
1468 [44932]: https://github.com/rust-lang/rust/pull/44932
1469 [45267]: https://github.com/rust-lang/rust/pull/45267
1470 [45324]: https://github.com/rust-lang/rust/pull/45324
1471 [45326]: https://github.com/rust-lang/rust/pull/45326
1472 [45333]: https://github.com/rust-lang/rust/pull/45333
1473 [45379]: https://github.com/rust-lang/rust/pull/45379
1474 [45380]: https://github.com/rust-lang/rust/pull/45380
1475 [45393]: https://github.com/rust-lang/rust/pull/45393
1476 [45435]: https://github.com/rust-lang/rust/pull/45435
1477 [45483]: https://github.com/rust-lang/rust/pull/45483
1478 [45524]: https://github.com/rust-lang/rust/pull/45524
1479 [45571]: https://github.com/rust-lang/rust/pull/45571
1480 [45580]: https://github.com/rust-lang/rust/pull/45580
1481 [45610]: https://github.com/rust-lang/rust/pull/45610
1482 [45660]: https://github.com/rust-lang/rust/pull/45660
1483 [45692]: https://github.com/rust-lang/rust/pull/45692
1484 [45711]: https://github.com/rust-lang/rust/pull/45711
1485 [45772]: https://github.com/rust-lang/rust/pull/45772
1486 [45852]: https://github.com/rust-lang/rust/issues/45852
1487 [45853]: https://github.com/rust-lang/rust/pull/45853
1488 [45887]: https://github.com/rust-lang/rust/pull/45887
1489 [45920]: https://github.com/rust-lang/rust/pull/45920
1490 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1491 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1492 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1495 Version 1.22.1 (2017-11-22)
1496 ==========================
1498 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1500 [46183]: https://github.com/rust-lang/rust/pull/46183
1502 Version 1.22.0 (2017-11-22)
1503 ==========================
1507 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1508 - [Now accepts underscores in unicode escapes][43716]
1509 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1510 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1514 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1515 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1516 This should decrease compile times for debug builds.
1517 - [strict memory alignment now enabled on ARMv6][45094]
1518 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1522 - [Allow atomic operations up to 32 bits
1523 on `armv5te_unknown_linux_gnueabi`][44978]
1524 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1525 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1526 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1527 - [Properly detect overflow in `Instant += Duration`.][44220]
1528 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1529 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1530 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1537 - [Cargo will now build multi file examples in subdirectories of the `examples`
1538 folder that have a `main.rs` file.][cargo/4496]
1539 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1540 the old format will continue to work and can be updated with `cargo update`.
1541 - [Now supports vendoring git repositories][cargo/3992]
1545 - [`libbacktrace` is now available on Apple platforms.][44251]
1546 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1547 This now lets you specify that a given code example will fail to compile.
1551 - [The minimum Android version that rustc can build for has been bumped
1552 to `4.0` from `2.3`][45656]
1553 - [Allowing `T op= &T` for numeric types has broken some type
1554 inference cases][45480]
1557 [42526]: https://github.com/rust-lang/rust/pull/42526
1558 [43017]: https://github.com/rust-lang/rust/pull/43017
1559 [43716]: https://github.com/rust-lang/rust/pull/43716
1560 [43949]: https://github.com/rust-lang/rust/pull/43949
1561 [44015]: https://github.com/rust-lang/rust/pull/44015
1562 [44220]: https://github.com/rust-lang/rust/pull/44220
1563 [44251]: https://github.com/rust-lang/rust/pull/44251
1564 [44287]: https://github.com/rust-lang/rust/pull/44287
1565 [44303]: https://github.com/rust-lang/rust/pull/44303
1566 [44456]: https://github.com/rust-lang/rust/pull/44456
1567 [44466]: https://github.com/rust-lang/rust/pull/44466
1568 [44895]: https://github.com/rust-lang/rust/pull/44895
1569 [44966]: https://github.com/rust-lang/rust/pull/44966
1570 [44978]: https://github.com/rust-lang/rust/pull/44978
1571 [45041]: https://github.com/rust-lang/rust/pull/45041
1572 [45064]: https://github.com/rust-lang/rust/pull/45064
1573 [45075]: https://github.com/rust-lang/rust/pull/45075
1574 [45094]: https://github.com/rust-lang/rust/pull/45094
1575 [45095]: https://github.com/rust-lang/rust/pull/45095
1576 [45480]: https://github.com/rust-lang/rust/issues/45480
1577 [45656]: https://github.com/rust-lang/rust/pull/45656
1578 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1579 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1580 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1587 Version 1.21.0 (2017-10-12)
1588 ==========================
1592 - [You can now use static references for literals.][43838]
1596 let x: &'static u32 = &0;
1599 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1602 my_macro!(Vec<i32>::new); // Always worked
1603 my_macro!(Vec::<i32>::new); // Now works
1608 - [Upgraded jemalloc to 4.5.0][43911]
1609 - [Enabled unwinding panics on Redox][43917]
1610 - [Now runs LLVM in parallel during translation phase.][43506]
1611 This should reduce peak memory usage.
1615 - [Generate builtin impls for `Clone` for all arrays and tuples that
1616 are `T: Clone`][43690]
1617 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1618 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1619 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1624 [`std::mem::discriminant`]
1628 - [You can now call `cargo install` with multiple package names][cargo/4216]
1629 - [Cargo commands inside a virtual workspace will now implicitly
1630 pass `--all`][cargo/4335]
1631 - [Added a `[patch]` section to `Cargo.toml` to handle
1632 prepublication dependencies][cargo/4123] [RFC 1969]
1633 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1634 like patterns][cargo/4270]
1635 - [Added the `--all-targets` option][cargo/4400]
1636 - [Using required dependencies as a feature is now deprecated and emits
1637 a warning][cargo/4364]
1642 - [Cargo docs are moving][43916]
1643 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1644 - [The rustdoc book is now available][43863]
1645 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1646 - [Added a preview of RLS has been made available through rustup][44204]
1647 Install with `rustup component add rls-preview`
1648 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1649 Previously only showed `std::os::unix`.
1653 - [Changes in method matching against higher-ranked types][43880] This may cause
1654 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1655 - [rustc's JSON error output's byte position start at top of file.][42973]
1656 Was previously relative to the rustc's internal `CodeMap` struct which
1657 required the unstable library `libsyntax` to correctly use.
1658 - [`unused_results` lint no longer ignores booleans][43728]
1660 [42565]: https://github.com/rust-lang/rust/pull/42565
1661 [42973]: https://github.com/rust-lang/rust/pull/42973
1662 [43348]: https://github.com/rust-lang/rust/pull/43348
1663 [43459]: https://github.com/rust-lang/rust/pull/43459
1664 [43506]: https://github.com/rust-lang/rust/pull/43506
1665 [43540]: https://github.com/rust-lang/rust/pull/43540
1666 [43690]: https://github.com/rust-lang/rust/pull/43690
1667 [43728]: https://github.com/rust-lang/rust/pull/43728
1668 [43838]: https://github.com/rust-lang/rust/pull/43838
1669 [43863]: https://github.com/rust-lang/rust/pull/43863
1670 [43880]: https://github.com/rust-lang/rust/pull/43880
1671 [43911]: https://github.com/rust-lang/rust/pull/43911
1672 [43916]: https://github.com/rust-lang/rust/pull/43916
1673 [43917]: https://github.com/rust-lang/rust/pull/43917
1674 [44204]: https://github.com/rust-lang/rust/pull/44204
1675 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1676 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1677 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1678 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1679 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1680 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1681 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1682 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1683 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1685 Version 1.20.0 (2017-08-31)
1686 ===========================
1690 - [Associated constants are now stabilised.][42809]
1691 - [A lot of macro bugs are now fixed.][42913]
1696 - [Struct fields are now properly coerced to the expected field type.][42807]
1697 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1698 `wasm32-experimental-emscripten` target.
1699 - [Changed some of the error messages to be more helpful.][42033]
1700 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1702 - [rustc now reports the total number of errors on compilation failure][43015]
1703 previously this was only the number of errors in the pass that failed.
1704 - [Expansion in rustc has been sped up 29x.][42533]
1705 - [added `msp430-none-elf` target.][43099]
1706 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1708 - [Fixes backtraces on Redox][43228]
1709 - [rustc now identifies different versions of same crate when absolute paths of
1710 different types match in an error message.][42826]
1716 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1717 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1719 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1720 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1721 - [Impl `Clone` for `DefaultHasher`.][42799]
1722 - [Impl `Sync` for `SyncSender`.][42397]
1723 - [Impl `FromStr` for `char`][42271]
1724 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1726 - [allow messages in the `unimplemented!()` macro.][42155]
1727 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1728 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1729 - [Upgrade to Unicode 10.0.0][42999]
1730 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1731 - [Skip the main thread's manual stack guard on Linux][43072]
1732 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1733 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1735 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1740 - [`CStr::into_c_string`]
1741 - [`CString::as_c_str`]
1742 - [`CString::into_boxed_c_str`]
1743 - [`Chain::get_mut`]
1744 - [`Chain::get_ref`]
1745 - [`Chain::into_inner`]
1746 - [`Option::get_or_insert_with`]
1747 - [`Option::get_or_insert`]
1748 - [`OsStr::into_os_string`]
1749 - [`OsString::into_boxed_os_str`]
1752 - [`Utf8Error::error_len`]
1753 - [`char::EscapeDebug`]
1754 - [`char::escape_debug`]
1755 - [`compile_error!`]
1756 - [`f32::from_bits`]
1758 - [`f64::from_bits`]
1760 - [`mem::ManuallyDrop`]
1761 - [`slice::sort_unstable_by_key`]
1762 - [`slice::sort_unstable_by`]
1763 - [`slice::sort_unstable`]
1764 - [`str::from_boxed_utf8_unchecked`]
1765 - [`str::as_bytes_mut`]
1766 - [`str::as_bytes_mut`]
1767 - [`str::from_utf8_mut`]
1768 - [`str::from_utf8_unchecked_mut`]
1770 - [`str::get_unchecked_mut`]
1771 - [`str::get_unchecked`]
1773 - [`str::into_boxed_bytes`]
1778 - [Cargo API token location moved from `~/.cargo/config` to
1779 `~/.cargo/credentials`.][cargo/3978]
1780 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1781 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1782 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1783 - [You can now specify version of a binary when installed through
1784 `cargo install` using `--vers`.][cargo/4229]
1785 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1786 failure.][cargo/4248]
1787 - [Changed the convention around which file is the crate root.][cargo/4259]
1788 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1789 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1794 - [Functions with `'static` in their return types will now not be as usable as
1795 if they were using lifetime parameters instead.][42417]
1796 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1797 takes the sign of NaN into account where previously didn't.][42430]
1799 [42033]: https://github.com/rust-lang/rust/pull/42033
1800 [42155]: https://github.com/rust-lang/rust/pull/42155
1801 [42271]: https://github.com/rust-lang/rust/pull/42271
1802 [42397]: https://github.com/rust-lang/rust/pull/42397
1803 [42417]: https://github.com/rust-lang/rust/pull/42417
1804 [42430]: https://github.com/rust-lang/rust/pull/42430
1805 [42431]: https://github.com/rust-lang/rust/pull/42431
1806 [42533]: https://github.com/rust-lang/rust/pull/42533
1807 [42571]: https://github.com/rust-lang/rust/pull/42571
1808 [42613]: https://github.com/rust-lang/rust/pull/42613
1809 [42799]: https://github.com/rust-lang/rust/pull/42799
1810 [42807]: https://github.com/rust-lang/rust/pull/42807
1811 [42809]: https://github.com/rust-lang/rust/pull/42809
1812 [42822]: https://github.com/rust-lang/rust/pull/42822
1813 [42826]: https://github.com/rust-lang/rust/pull/42826
1814 [42854]: https://github.com/rust-lang/rust/pull/42854
1815 [42913]: https://github.com/rust-lang/rust/pull/42913
1816 [42999]: https://github.com/rust-lang/rust/pull/42999
1817 [43011]: https://github.com/rust-lang/rust/pull/43011
1818 [43015]: https://github.com/rust-lang/rust/pull/43015
1819 [43072]: https://github.com/rust-lang/rust/pull/43072
1820 [43077]: https://github.com/rust-lang/rust/pull/43077
1821 [43097]: https://github.com/rust-lang/rust/pull/43097
1822 [43099]: https://github.com/rust-lang/rust/pull/43099
1823 [43170]: https://github.com/rust-lang/rust/pull/43170
1824 [43178]: https://github.com/rust-lang/rust/pull/43178
1825 [43185]: https://github.com/rust-lang/rust/pull/43185
1826 [43228]: https://github.com/rust-lang/rust/pull/43228
1827 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1828 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1829 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1830 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1831 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1832 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1833 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1834 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1835 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1836 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1837 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1838 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1839 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1840 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1841 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1842 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1843 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1844 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1845 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1846 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1847 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1848 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1849 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1850 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1851 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1852 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1853 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1854 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1855 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1856 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1857 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1858 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1859 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1860 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1861 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1862 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1863 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1864 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1865 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1868 Version 1.19.0 (2017-07-20)
1869 ===========================
1874 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1875 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1876 - [Macro recursion limit increased to 1024 from 64.][41676]
1877 - [Added lint for detecting unused macros.][41907]
1878 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1879 For example: `let x = loop { break 7; };`
1880 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1881 contain `Copy` types and cannot have a `Drop` implementation.
1882 Example: `union Foo { bar: u8, baz: usize }`
1883 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1884 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1889 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1890 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1891 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1892 you should use `--target armv7-linux-androideabi`.
1893 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1894 - [Minor optimisation of string operations.][42037]
1895 - [Compiler error message is now `aborting due to previous error(s)` instead of
1896 `aborting due to N previous errors`][42150] This was previously inaccurate and
1897 would only count certain kinds of errors.
1898 - [The compiler now supports Visual Studio 2017][42225]
1899 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1900 - [Added a lot][42264] of [new error codes][42302]
1901 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1902 libraries with C Run-time Libraries(CRT) to be statically linked.
1903 - [Fixed various ARM codegen bugs][42740]
1908 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1909 `Extend<Cow<'a, str>>`][41449]
1910 - [`Vec` now implements `From<&mut [T]>`][41530]
1911 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1912 - [`SplitWhitespace` now implements `Clone`][41659]
1913 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1915 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1916 macros, but for printing to stderr.
1921 - [`OsString::shrink_to_fit`]
1924 - [`thread::ThreadId`]
1929 - [Build scripts can now add environment variables to the environment
1930 the crate is being compiled in.
1931 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1932 - [Subcommands now replace the current process rather than spawning a new
1933 child process][cargo/3970]
1934 - [Workspace members can now accept glob file patterns][cargo/3979]
1935 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1936 the members in a given workspace.][cargo/3988]
1937 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1938 - [Target directory path is now in the cargo metadata][cargo/4022]
1939 - [Cargo no longer checks out a local working directory for the
1940 crates.io index][cargo/4026] This should provide smaller file size for the
1941 registry, and improve cloning times, especially on Windows machines.
1942 - [Added an `--exclude` option for excluding certain packages when using the
1943 `--all` option][cargo/4031]
1944 - [Cargo will now automatically retry when receiving a 5xx error
1945 from crates.io][cargo/4032]
1946 - [The `--features` option now accepts multiple comma or space
1947 delimited values.][cargo/4084]
1948 - [Added support for custom target specific runners][cargo/3954]
1953 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1955 - [Rust will now release XZ compressed packages][rust-installer/57]
1956 - [rustup will now prefer to download rust packages with
1957 XZ compression][rustup/1100] over GZip packages.
1958 - [Added the ability to escape `#` in rust documentation][41785] By adding
1959 additional `#`'s ie. `##` is now `#`
1964 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1965 - [`-Z` flags are now no longer allowed to be used on the stable
1966 compiler.][41751] This has been a warning for a year previous to this.
1967 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1968 longer works][42844]. Users should migrate to the built-in `check`
1969 command, which has been available since 1.16.
1970 - [Ending a float literal with `._` is now a hard error.
1971 Example: `42._` .][41946]
1972 - [Any use of a private `extern crate` outside of its module is now a
1973 hard error.][36886] This was previously a warning.
1974 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1975 relative while the `::` prefix makes a path absolute, but was ignored and the
1976 path was relative regardless.
1977 - [Floating point constants in match patterns is now a hard error][36890]
1978 This was previously a warning.
1979 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
1980 match patterns is now a hard error][36891] This was previously a warning.
1981 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
1983 - [From the pound escape, lines consisting of multiple `#`s are
1985 - [It is an error to re-export private enum variants][42460]. This is
1986 known to break a number of crates that depend on an older version of
1988 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
1989 to use it to find the linker, and the build will fail where it did
1990 not previously][42607]
1992 [36886]: https://github.com/rust-lang/rust/issues/36886
1993 [36888]: https://github.com/rust-lang/rust/issues/36888
1994 [36890]: https://github.com/rust-lang/rust/issues/36890
1995 [36891]: https://github.com/rust-lang/rust/issues/36891
1996 [36892]: https://github.com/rust-lang/rust/issues/36892
1997 [37406]: https://github.com/rust-lang/rust/issues/37406
1998 [39983]: https://github.com/rust-lang/rust/pull/39983
1999 [41145]: https://github.com/rust-lang/rust/pull/41145
2000 [41192]: https://github.com/rust-lang/rust/pull/41192
2001 [41258]: https://github.com/rust-lang/rust/pull/41258
2002 [41370]: https://github.com/rust-lang/rust/pull/41370
2003 [41449]: https://github.com/rust-lang/rust/pull/41449
2004 [41530]: https://github.com/rust-lang/rust/pull/41530
2005 [41624]: https://github.com/rust-lang/rust/pull/41624
2006 [41656]: https://github.com/rust-lang/rust/pull/41656
2007 [41659]: https://github.com/rust-lang/rust/pull/41659
2008 [41676]: https://github.com/rust-lang/rust/pull/41676
2009 [41751]: https://github.com/rust-lang/rust/pull/41751
2010 [41764]: https://github.com/rust-lang/rust/pull/41764
2011 [41785]: https://github.com/rust-lang/rust/pull/41785
2012 [41873]: https://github.com/rust-lang/rust/pull/41873
2013 [41907]: https://github.com/rust-lang/rust/pull/41907
2014 [41946]: https://github.com/rust-lang/rust/pull/41946
2015 [42016]: https://github.com/rust-lang/rust/pull/42016
2016 [42037]: https://github.com/rust-lang/rust/pull/42037
2017 [42068]: https://github.com/rust-lang/rust/pull/42068
2018 [42150]: https://github.com/rust-lang/rust/pull/42150
2019 [42162]: https://github.com/rust-lang/rust/pull/42162
2020 [42225]: https://github.com/rust-lang/rust/pull/42225
2021 [42264]: https://github.com/rust-lang/rust/pull/42264
2022 [42302]: https://github.com/rust-lang/rust/pull/42302
2023 [42460]: https://github.com/rust-lang/rust/issues/42460
2024 [42607]: https://github.com/rust-lang/rust/issues/42607
2025 [42740]: https://github.com/rust-lang/rust/pull/42740
2026 [42844]: https://github.com/rust-lang/rust/issues/42844
2027 [42948]: https://github.com/rust-lang/rust/pull/42948
2028 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2029 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2030 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2031 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2032 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2033 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2034 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2035 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2036 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2037 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2038 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2039 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2040 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2041 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2042 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2043 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2044 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2045 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2046 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2047 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2048 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2049 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2052 Version 1.18.0 (2017-06-08)
2053 ===========================
2058 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2059 make the item visible to just that module tree. Also accepts the keyword
2060 `crate` to make something public to the whole crate but not users of the
2061 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2062 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2063 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2064 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2065 types like `Write + Send`, trailing `+` are now supported in trait objects,
2066 and better error reporting for trait objects starting with `?Sized`.
2067 - [0e+10 is now a valid floating point literal][40589]
2068 - [Now warns if you bind a lifetime parameter to 'static][40734]
2069 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2070 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2071 representation in some cases.][40377]
2076 - [rustc can now emit mir with `--emit mir`][39891]
2077 - [Improved LLVM IR for trivial functions][40367]
2078 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2079 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2080 opportunities found through profiling
2081 - [Improved backtrace formatting when panicking][38165]
2086 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2087 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2088 iteration or reallocation.
2089 - [Simplified HashMap Bucket interface][40561] provides performance
2090 improvements for iterating and cloning.
2091 - [Specialize Vec::from_elem to use calloc][40409]
2092 - [Fixed Race condition in fs::create_dir_all][39799]
2093 - [No longer caching stdio on Windows][40516]
2094 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2095 2.50%~ faster and in one case now 12.50% faster.
2096 - [Optimized `AtomicBool::fetch_nand`][41143]
2101 - [`Child::try_wait`]
2102 - [`HashMap::retain`]
2103 - [`HashSet::retain`]
2105 - [`TcpStream::peek`]
2106 - [`UdpSocket::peek`]
2107 - [`UdpSocket::peek_from`]
2112 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
2113 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
2114 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
2115 - [Added Android build support][cargo/3885]
2116 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
2117 of a certain type, for example `cargo build --bins` will build all
2119 - [Added support for haiku][cargo/3952]
2124 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
2125 - [Added rust-windbg script for better debugging on Windows][39983]
2126 - [Rust now uses the official cross compiler for NetBSD][40612]
2127 - [rustdoc now accepts `#` at the start of files][40828]
2128 - [Fixed jemalloc support for musl][41168]
2133 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
2134 always placed after the sign if it exists and before the digits. With the `#`
2135 flag the zeroes are placed after the prefix and before the digits.
2136 - [Due to the struct field optimisation][40377], using `transmute` on structs
2137 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
2138 always been undefined behavior, but is now more likely to break in practice.
2139 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
2140 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
2141 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
2142 - [Overlapping inherent `impl`s are now a hard error][40728]
2143 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
2144 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
2145 `out.asm` and `out.ll` instead of only one of the filetypes.
2146 - [ calling a function that returns `Self` will no longer work][41805] when
2147 the size of `Self` cannot be statically determined.
2148 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
2149 this has caused a few regressions namely:
2151 - Changed the link order of local static/dynamic libraries (respecting the
2152 order on given rather than having the compiler reorder).
2153 - Changed how MinGW is linked, native code linked to dynamic libraries
2154 may require manually linking to the gcc support library (for the native
2157 [38165]: https://github.com/rust-lang/rust/pull/38165
2158 [39799]: https://github.com/rust-lang/rust/pull/39799
2159 [39891]: https://github.com/rust-lang/rust/pull/39891
2160 [39983]: https://github.com/rust-lang/rust/pull/39983
2161 [40043]: https://github.com/rust-lang/rust/pull/40043
2162 [40241]: https://github.com/rust-lang/rust/pull/40241
2163 [40338]: https://github.com/rust-lang/rust/pull/40338
2164 [40367]: https://github.com/rust-lang/rust/pull/40367
2165 [40377]: https://github.com/rust-lang/rust/pull/40377
2166 [40409]: https://github.com/rust-lang/rust/pull/40409
2167 [40516]: https://github.com/rust-lang/rust/pull/40516
2168 [40556]: https://github.com/rust-lang/rust/pull/40556
2169 [40561]: https://github.com/rust-lang/rust/pull/40561
2170 [40589]: https://github.com/rust-lang/rust/pull/40589
2171 [40612]: https://github.com/rust-lang/rust/pull/40612
2172 [40723]: https://github.com/rust-lang/rust/pull/40723
2173 [40728]: https://github.com/rust-lang/rust/pull/40728
2174 [40731]: https://github.com/rust-lang/rust/pull/40731
2175 [40734]: https://github.com/rust-lang/rust/pull/40734
2176 [40805]: https://github.com/rust-lang/rust/pull/40805
2177 [40807]: https://github.com/rust-lang/rust/pull/40807
2178 [40828]: https://github.com/rust-lang/rust/pull/40828
2179 [40870]: https://github.com/rust-lang/rust/pull/40870
2180 [41085]: https://github.com/rust-lang/rust/pull/41085
2181 [41143]: https://github.com/rust-lang/rust/pull/41143
2182 [41168]: https://github.com/rust-lang/rust/pull/41168
2183 [41270]: https://github.com/rust-lang/rust/issues/41270
2184 [41469]: https://github.com/rust-lang/rust/pull/41469
2185 [41805]: https://github.com/rust-lang/rust/issues/41805
2186 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
2187 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
2188 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
2189 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
2190 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
2191 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
2192 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
2193 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
2194 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
2195 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
2196 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
2197 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
2198 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
2199 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
2202 Version 1.17.0 (2017-04-27)
2203 ===========================
2208 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
2209 * [Fields of structs may be initialized without duplicating the field/variable
2210 names][39761]. [RFC 1682]
2211 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
2212 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2213 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
2214 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
2215 `'b`. Soundness fix.
2216 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
2217 * [Static variables may contain references to other statics][40027]
2222 * [Exit quickly on only `--emit dep-info`][40336]
2223 * [Make `-C relocation-model` more correctly determine whether the linker
2224 creates a position-independent executable][40245]
2225 * [Add `-C overflow-checks` to directly control whether integer overflow
2227 * [The rustc type checker now checks items on demand instead of in a single
2228 in-order pass][40008]. This is mostly an internal refactoring in support of
2229 future work, including incremental type checking, but also resolves [RFC
2230 1647], allowing `Self` to appear in `impl` `where` clauses.
2231 * [Optimize vtable loads][39995]
2232 * [Turn off vectorization for Emscripten targets][39990]
2233 * [Provide suggestions for unknown macros imported with `use`][39953]
2234 * [Fix ICEs in path resolution][39939]
2235 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
2236 * [Add clearer error message using `&str + &str`][39116]
2247 * [`Ordering::then`]
2248 * [`Ordering::then_with`]
2249 * [`BTreeMap::range`]
2250 * [`BTreeMap::range_mut`]
2251 * [`collections::Bound`]
2252 * [`process::abort`]
2253 * [`ptr::read_unaligned`]
2254 * [`ptr::write_unaligned`]
2255 * [`Result::expect_err`]
2258 * [`Cell::into_inner`]
2264 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
2265 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
2266 * [`String` implements `FromIterator<&char>`][40028]
2267 * `Box` [implements][40009] a number of new conversions:
2268 `From<Box<str>> for String`,
2269 `From<Box<[T]>> for Vec<T>`,
2270 `From<Box<CStr>> for CString`,
2271 `From<Box<OsStr>> for OsString`,
2272 `From<Box<Path>> for PathBuf`,
2273 `Into<Box<str>> for String`,
2274 `Into<Box<[T]>> for Vec<T>`,
2275 `Into<Box<CStr>> for CString`,
2276 `Into<Box<OsStr>> for OsString`,
2277 `Into<Box<Path>> for PathBuf`,
2278 `Default for Box<str>`,
2279 `Default for Box<CStr>`,
2280 `Default for Box<OsStr>`,
2281 `From<&CStr> for Box<CStr>`,
2282 `From<&OsStr> for Box<OsStr>`,
2283 `From<&Path> for Box<Path>`
2284 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
2285 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
2286 * [Slightly optimize `slice::sort`][39538]
2287 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
2288 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
2289 `Box<str>` implements `From<&str>`][39438]
2290 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
2291 `From<(I, u16)> where I: Into<IpAddr>`][39372]
2292 * [`format!` estimates the needed capacity before writing a string][39356]
2293 * [Support unprivileged symlink creation in Windows][38921]
2294 * [`PathBuf` implements `Default`][38764]
2295 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
2296 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
2297 and poor hash functions.
2302 * [Add `cargo check --all`][cargo/3731]
2303 * [Add an option to ignore SSL revocation checking][cargo/3699]
2304 * [Add `cargo run --package`][cargo/3691]
2305 * [Add `required_features`][cargo/3667]
2306 * [Assume `build.rs` is a build script][cargo/3664]
2307 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
2312 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
2314 * [The "Unstable Book" documents nightly-only features][ubook]
2315 * [Improve the style of the sidebar in rustdoc output][40265]
2316 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
2317 * [Fix MSP430 breakage due to `i128`][40257]
2318 * [Preliminary Solaris/SPARCv9 support][39903]
2319 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
2320 run without installing the MSVC runtime.
2321 * [`rustdoc --test` includes file names in test names][39788]
2322 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
2323 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
2324 * [Initial support for `aarch64-unknown-freebsd`][39491]
2325 * [Initial support for `i686-unknown-netbsd`][39426]
2326 * [This release no longer includes the old makefile build system][39431]. Rust
2327 is built with a custom build system, written in Rust, and with Cargo.
2328 * [Add Debug implementations for libcollection structs][39002]
2329 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
2330 * [`--test-threads=0` produces an error][38945]
2331 * [`rustup` installs documentation by default][40526]
2332 * [The Rust source includes NatVis visualizations][39843]. These can be used by
2333 WinDbg and Visual Studio to improve the debugging experience.
2338 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
2339 workaround, either use MSVC 2015 or run vcvars.bat.
2340 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2341 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
2342 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
2344 * [`format!` and `Display::to_string` panic if an underlying formatting
2345 implementation returns an error][40117]. Previously the error was silently
2346 ignored. It is incorrect for `write_fmt` to return an error when writing
2348 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
2349 crates were marked stable and could be accessed from the stable toolchain.
2350 * [Rust git source no longer includes vendored crates][39728]. Those that need
2351 to build with vendored crates should build from release tarballs.
2352 * [Fix inert attributes from `proc_macro_derives`][39572]
2353 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
2354 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
2356 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
2357 existing code generally ignores the type of dead-code unless a type-hint is
2358 provided; this can cause surprising inference interactions particularly around
2359 defaulting. The new code uniformly ignores the result type of dead-code.
2360 * [Tuple-struct constructors with private fields are no longer visible][38932]
2361 * [Lifetime parameters that do not appear in the arguments are now considered
2362 early-bound][38897], resolving a soundness bug (#[32330]). The
2363 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
2365 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2366 * [Make transmuting from fn item types to pointer-sized types a hard
2369 [27787]: https://github.com/rust-lang/rust/issues/27787
2370 [32330]: https://github.com/rust-lang/rust/issues/32330
2371 [34198]: https://github.com/rust-lang/rust/pull/34198
2372 [38161]: https://github.com/rust-lang/rust/pull/38161
2373 [38368]: https://github.com/rust-lang/rust/pull/38368
2374 [38584]: https://github.com/rust-lang/rust/issues/38584
2375 [38661]: https://github.com/rust-lang/rust/pull/38661
2376 [38764]: https://github.com/rust-lang/rust/pull/38764
2377 [38864]: https://github.com/rust-lang/rust/issues/38864
2378 [38897]: https://github.com/rust-lang/rust/pull/38897
2379 [38921]: https://github.com/rust-lang/rust/pull/38921
2380 [38932]: https://github.com/rust-lang/rust/pull/38932
2381 [38945]: https://github.com/rust-lang/rust/pull/38945
2382 [38981]: https://github.com/rust-lang/rust/pull/38981
2383 [39002]: https://github.com/rust-lang/rust/pull/39002
2384 [39116]: https://github.com/rust-lang/rust/pull/39116
2385 [39193]: https://github.com/rust-lang/rust/pull/39193
2386 [39265]: https://github.com/rust-lang/rust/pull/39265
2387 [39356]: https://github.com/rust-lang/rust/pull/39356
2388 [39372]: https://github.com/rust-lang/rust/pull/39372
2389 [39426]: https://github.com/rust-lang/rust/pull/39426
2390 [39431]: https://github.com/rust-lang/rust/pull/39431
2391 [39438]: https://github.com/rust-lang/rust/pull/39438
2392 [39440]: https://github.com/rust-lang/rust/pull/39440
2393 [39485]: https://github.com/rust-lang/rust/pull/39485
2394 [39491]: https://github.com/rust-lang/rust/pull/39491
2395 [39518]: https://github.com/rust-lang/rust/pull/39518
2396 [39538]: https://github.com/rust-lang/rust/pull/39538
2397 [39572]: https://github.com/rust-lang/rust/pull/39572
2398 [39633]: https://github.com/rust-lang/rust/pull/39633
2399 [39642]: https://github.com/rust-lang/rust/pull/39642
2400 [39728]: https://github.com/rust-lang/rust/pull/39728
2401 [39761]: https://github.com/rust-lang/rust/pull/39761
2402 [39788]: https://github.com/rust-lang/rust/pull/39788
2403 [39793]: https://github.com/rust-lang/rust/pull/39793
2404 [39837]: https://github.com/rust-lang/rust/pull/39837
2405 [39843]: https://github.com/rust-lang/rust/pull/39843
2406 [39851]: https://github.com/rust-lang/rust/pull/39851
2407 [39903]: https://github.com/rust-lang/rust/pull/39903
2408 [39939]: https://github.com/rust-lang/rust/pull/39939
2409 [39953]: https://github.com/rust-lang/rust/pull/39953
2410 [39960]: https://github.com/rust-lang/rust/pull/39960
2411 [39990]: https://github.com/rust-lang/rust/pull/39990
2412 [39995]: https://github.com/rust-lang/rust/pull/39995
2413 [40008]: https://github.com/rust-lang/rust/pull/40008
2414 [40009]: https://github.com/rust-lang/rust/pull/40009
2415 [40027]: https://github.com/rust-lang/rust/pull/40027
2416 [40028]: https://github.com/rust-lang/rust/pull/40028
2417 [40037]: https://github.com/rust-lang/rust/pull/40037
2418 [40117]: https://github.com/rust-lang/rust/pull/40117
2419 [40166]: https://github.com/rust-lang/rust/pull/40166
2420 [40245]: https://github.com/rust-lang/rust/pull/40245
2421 [40257]: https://github.com/rust-lang/rust/pull/40257
2422 [40261]: https://github.com/rust-lang/rust/pull/40261
2423 [40265]: https://github.com/rust-lang/rust/pull/40265
2424 [40319]: https://github.com/rust-lang/rust/pull/40319
2425 [40336]: https://github.com/rust-lang/rust/pull/40336
2426 [40526]: https://github.com/rust-lang/rust/pull/40526
2427 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2428 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2429 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2430 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2431 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2432 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2433 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2434 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2435 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2436 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2437 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2438 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2439 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2440 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2441 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2442 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2443 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2444 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2445 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2446 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2447 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2448 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2449 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2450 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2451 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2452 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2453 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2454 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2455 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2456 [mdbook]: https://crates.io/crates/mdbook
2457 [ubook]: https://doc.rust-lang.org/unstable-book/
2460 Version 1.16.0 (2017-03-16)
2461 ===========================
2466 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2467 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2468 match patterns][38069]
2469 * [Clean up semantics of `self` in an import list][38313]
2470 * [`Self` may appear in `impl` headers][38920]
2471 * [`Self` may appear in struct expressions][39282]
2476 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2477 a `.rmeta` file containing only crate metadata][38571]. This can be
2478 used by tools like the Rust Language Service to perform
2479 metadata-only builds.
2480 * [Levenshtein based typo suggestions now work in most places, while
2481 previously they worked only for fields and sometimes for local
2482 variables][38927]. Together with the overhaul of "no
2483 resolution"/"unexpected resolution" errors (#[38154]) they result in
2484 large and systematic improvement in resolution diagnostics.
2485 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2487 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2488 * [`rustc` no longer attempts to provide "consider using an explicit
2489 lifetime" suggestions][37057]. They were inaccurate.
2494 * [`VecDeque::truncate`]
2495 * [`VecDeque::resize`]
2496 * [`String::insert_str`]
2497 * [`Duration::checked_add`]
2498 * [`Duration::checked_sub`]
2499 * [`Duration::checked_div`]
2500 * [`Duration::checked_mul`]
2503 * [`SocketAddr::is_ipv4`]
2504 * [`SocketAddr::is_ipv6`]
2505 * [`IpAddr::is_ipv4`]
2506 * [`IpAddr::is_ipv6`]
2508 * [`Vec::dedup_by_key`]
2509 * [`Result::unwrap_or_default`]
2510 * [`<*const T>::wrapping_offset`]
2511 * [`<*mut T>::wrapping_offset`]
2512 * `CommandExt::creation_flags`
2513 * [`File::set_permissions`]
2514 * [`String::split_off`]
2519 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2520 their argument by `Borrow` parameter][37761]
2521 * [All public types in std implement `Debug`][38006]
2522 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2523 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2524 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2526 * [std: Fix partial writes in `LineWriter`][38062]
2527 * [std: Clamp max read/write sizes on Unix][38062]
2528 * [Use more specific panic message for `&str` slicing errors][38066]
2529 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2530 functionality cannot be achieved in std currently.
2531 * [`writeln!`, like `println!`, now accepts a form with no string
2532 or formatting arguments, to just print a newline][38469]
2533 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2534 * [Reduce the size of static data in `std_unicode::tables`][38781]
2535 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2536 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2538 * [`Duration` implements `Sum`][38712]
2539 * [`String` implements `ToSocketAddrs`][39048]
2544 * [The `cargo check` command does a type check of a project without
2545 building it][cargo/3296]
2546 * [crates.io will display CI badges from Travis and AppVeyor, if
2547 specified in Cargo.toml][cargo/3546]
2548 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2549 * [Compilation profiles accept integer values for `debug`, in addition
2550 to `true` and `false`. These are passed to `rustc` as the value to
2551 `-C debuginfo`][cargo/3534]
2552 * [Implement `cargo --version --verbose`][cargo/3604]
2553 * [All builds now output 'dep-info' build dependencies compatible with
2554 make and ninja][cargo/3557]
2555 * [Build all workspace members with `build --all`][cargo/3511]
2556 * [Document all workspace members with `doc --all`][cargo/3515]
2557 * [Path deps outside workspace are not members][cargo/3443]
2562 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2563 the path to the Rust implementation][38589]
2564 * [The `armv7-linux-androideabi` target no longer enables NEON
2565 extensions, per Google's ABI guide][38413]
2566 * [The stock standard library can be compiled for Redox OS][38401]
2567 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2569 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2571 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2576 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2577 match patterns][38069]
2578 * In this release, references to uninhabited types can not be
2579 pattern-matched. This was accidentally allowed in 1.15.
2580 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2581 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2583 * [Clean up semantics of `self` in an import list][38313]
2584 * Reimplemented lifetime elision. This change was almost entirely compatible
2585 with existing code, but it did close a number of small bugs and loopholes,
2586 as well as being more accepting in some other [cases][41105].
2588 [37057]: https://github.com/rust-lang/rust/pull/37057
2589 [37761]: https://github.com/rust-lang/rust/pull/37761
2590 [38006]: https://github.com/rust-lang/rust/pull/38006
2591 [38051]: https://github.com/rust-lang/rust/pull/38051
2592 [38062]: https://github.com/rust-lang/rust/pull/38062
2593 [38062]: https://github.com/rust-lang/rust/pull/38622
2594 [38066]: https://github.com/rust-lang/rust/pull/38066
2595 [38069]: https://github.com/rust-lang/rust/pull/38069
2596 [38131]: https://github.com/rust-lang/rust/pull/38131
2597 [38154]: https://github.com/rust-lang/rust/pull/38154
2598 [38274]: https://github.com/rust-lang/rust/pull/38274
2599 [38304]: https://github.com/rust-lang/rust/pull/38304
2600 [38313]: https://github.com/rust-lang/rust/pull/38313
2601 [38314]: https://github.com/rust-lang/rust/pull/38314
2602 [38327]: https://github.com/rust-lang/rust/pull/38327
2603 [38401]: https://github.com/rust-lang/rust/pull/38401
2604 [38413]: https://github.com/rust-lang/rust/pull/38413
2605 [38469]: https://github.com/rust-lang/rust/pull/38469
2606 [38559]: https://github.com/rust-lang/rust/pull/38559
2607 [38571]: https://github.com/rust-lang/rust/pull/38571
2608 [38580]: https://github.com/rust-lang/rust/pull/38580
2609 [38589]: https://github.com/rust-lang/rust/pull/38589
2610 [38670]: https://github.com/rust-lang/rust/pull/38670
2611 [38712]: https://github.com/rust-lang/rust/pull/38712
2612 [38726]: https://github.com/rust-lang/rust/pull/38726
2613 [38781]: https://github.com/rust-lang/rust/pull/38781
2614 [38798]: https://github.com/rust-lang/rust/pull/38798
2615 [38909]: https://github.com/rust-lang/rust/pull/38909
2616 [38920]: https://github.com/rust-lang/rust/pull/38920
2617 [38927]: https://github.com/rust-lang/rust/pull/38927
2618 [39048]: https://github.com/rust-lang/rust/pull/39048
2619 [39282]: https://github.com/rust-lang/rust/pull/39282
2620 [39379]: https://github.com/rust-lang/rust/pull/39379
2621 [41105]: https://github.com/rust-lang/rust/issues/41105
2622 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2623 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2624 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2625 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2626 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2627 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2628 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2629 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2630 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2631 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2632 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2633 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2634 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2635 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2636 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2637 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2638 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2639 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2640 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2641 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2642 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2643 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2644 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2645 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2646 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2647 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2648 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2649 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2650 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2651 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2654 Version 1.15.1 (2017-02-09)
2655 ===========================
2657 * [Fix IntoIter::as_mut_slice's signature][39466]
2658 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2660 [39466]: https://github.com/rust-lang/rust/pull/39466
2661 [39523]: https://github.com/rust-lang/rust/pull/39523
2664 Version 1.15.0 (2017-02-02)
2665 ===========================
2670 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2671 stable. This allows popular code-generating crates like Serde and Diesel to
2672 work ergonomically. [RFC 1681].
2673 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2674 with curly braces][36868]. Part of [RFC 1506].
2675 * [A number of minor changes to name resolution have been activated][37127].
2676 They add up to more consistent semantics, allowing for future evolution of
2677 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2678 details of what is different. The breaking changes here have been transitioned
2679 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2680 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2682 * [`?Sized` can be used in `where` clauses][37791]
2683 * [There is now a limit on the size of monomorphized types and it can be
2684 modified with the `#![type_size_limit]` crate attribute, similarly to
2685 the `#![recursion_limit]` attribute][37789]
2690 * [On Windows, the compiler will apply dllimport attributes when linking to
2691 extern functions][37973]. Additional attributes and flags can control which
2692 library kind is linked and its name. [RFC 1717].
2693 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2694 * [The `--test` flag works with procedural macro crates][38107]
2695 * [Fix `extern "aapcs" fn` ABI][37814]
2696 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2697 * [The `format!` expander recognizes incorrect `printf` and shell-style
2698 formatting directives and suggests the correct format][37613].
2699 * [Only report one error for all unused imports in an import list][37456]
2701 Compiler Performance
2702 --------------------
2704 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2705 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2706 * [Don't clone in `UnificationTable::probe`][37848]
2707 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2708 * [Use small vectors in type walker][37760]
2709 * [Macro expansion performance was improved][37701]
2710 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2711 * [Replace FNV with a faster hash function][37229]
2716 * [`std::iter::Iterator::min_by`]
2717 * [`std::iter::Iterator::max_by`]
2718 * [`std::os::*::fs::FileExt`]
2719 * [`std::sync::atomic::Atomic*::get_mut`]
2720 * [`std::sync::atomic::Atomic*::into_inner`]
2721 * [`std::vec::IntoIter::as_slice`]
2722 * [`std::vec::IntoIter::as_mut_slice`]
2723 * [`std::sync::mpsc::Receiver::try_iter`]
2724 * [`std::os::unix::process::CommandExt::before_exec`]
2725 * [`std::rc::Rc::strong_count`]
2726 * [`std::rc::Rc::weak_count`]
2727 * [`std::sync::Arc::strong_count`]
2728 * [`std::sync::Arc::weak_count`]
2729 * [`std::char::encode_utf8`]
2730 * [`std::char::encode_utf16`]
2731 * [`std::cell::Ref::clone`]
2732 * [`std::io::Take::into_inner`]
2737 * [The standard sorting algorithm has been rewritten for dramatic performance
2738 improvements][38192]. It is a hybrid merge sort, drawing influences from
2739 Timsort. Previously it was a naive merge sort.
2740 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2741 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2743 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2744 and `char_indices().last()`][37882]
2745 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2746 * [Chinese characters display correctly in `fmt::Debug`][37855]
2747 * [Derive `Default` for `Duration`][37699]
2748 * [Support creation of anonymous pipes on WinXP/2k][37677]
2749 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2750 * [Don't pass overlapped handles to processes][38835]
2755 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2756 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2757 should instead check the variable at runtime with `std::env`. That the value
2758 was set at build time was a bug, and incorrect when cross-compiling. This
2759 change is known to cause breakage.
2760 * [Add `--all` flag to `cargo test`][cargo/3221]
2761 * [Compile statically against the MSVC CRT][cargo/3363]
2762 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2763 * [Link OpenSSL statically on OSX][cargo/3311]
2764 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2765 * [Test for bad path overrides with summaries][cargo/3336]
2766 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2767 * [Fix retrying crate downloads for network errors][cargo/3348]
2768 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2769 * [Emit more info on --message-format=json][cargo/3319]
2770 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2771 * [Don't ignore errors in workspace manifest][cargo/3409]
2772 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2777 * [Test runners (binaries built with `--test`) now support a `--list` argument
2778 that lists the tests it contains][38185]
2779 * [Test runners now support a `--exact` argument that makes the test filter
2780 match exactly, instead of matching only a substring of the test name][38181]
2781 * [rustdoc supports a `--playground-url` flag][37763]
2782 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2787 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2788 continue to be used in this release by passing `--disable-rustbuild` to the
2789 configure script, but they will be deleted soon. Note that the new build
2790 system uses a different on-disk layout that will likely affect any scripts
2792 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2794 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2795 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2801 * [A number of minor changes to name resolution have been activated][37127].
2802 They add up to more consistent semantics, allowing for future evolution of
2803 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2804 details of what is different. The breaking changes here have been transitioned
2805 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2806 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2807 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2808 should instead check the variable at runtime with `std::env`. That the value
2809 was set at build time was a bug, and incorrect when cross-compiling. This
2810 change is known to cause breakage.
2811 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2812 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2813 1.10 and is now an error by default. It will become a hard error in the near
2815 * [The semantics relating modules to file system directories are changing in
2816 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2817 lint, which is a warning in this release, and will become a hard error in the
2819 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2820 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2821 the underlying iterator][37834]
2823 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2824 [33685]: https://github.com/rust-lang/rust/issues/33685
2825 [36868]: https://github.com/rust-lang/rust/pull/36868
2826 [37127]: https://github.com/rust-lang/rust/pull/37127
2827 [37229]: https://github.com/rust-lang/rust/pull/37229
2828 [37456]: https://github.com/rust-lang/rust/pull/37456
2829 [37527]: https://github.com/rust-lang/rust/pull/37527
2830 [37602]: https://github.com/rust-lang/rust/pull/37602
2831 [37613]: https://github.com/rust-lang/rust/pull/37613
2832 [37615]: https://github.com/rust-lang/rust/pull/37615
2833 [37636]: https://github.com/rust-lang/rust/pull/37636
2834 [37627]: https://github.com/rust-lang/rust/pull/37627
2835 [37642]: https://github.com/rust-lang/rust/pull/37642
2836 [37677]: https://github.com/rust-lang/rust/pull/37677
2837 [37699]: https://github.com/rust-lang/rust/pull/37699
2838 [37701]: https://github.com/rust-lang/rust/pull/37701
2839 [37705]: https://github.com/rust-lang/rust/pull/37705
2840 [37749]: https://github.com/rust-lang/rust/pull/37749
2841 [37760]: https://github.com/rust-lang/rust/pull/37760
2842 [37763]: https://github.com/rust-lang/rust/pull/37763
2843 [37764]: https://github.com/rust-lang/rust/pull/37764
2844 [37789]: https://github.com/rust-lang/rust/pull/37789
2845 [37791]: https://github.com/rust-lang/rust/pull/37791
2846 [37814]: https://github.com/rust-lang/rust/pull/37814
2847 [37817]: https://github.com/rust-lang/rust/pull/37817
2848 [37834]: https://github.com/rust-lang/rust/pull/37834
2849 [37848]: https://github.com/rust-lang/rust/pull/37848
2850 [37855]: https://github.com/rust-lang/rust/pull/37855
2851 [37882]: https://github.com/rust-lang/rust/pull/37882
2852 [37888]: https://github.com/rust-lang/rust/pull/37888
2853 [37973]: https://github.com/rust-lang/rust/pull/37973
2854 [37979]: https://github.com/rust-lang/rust/pull/37979
2855 [38086]: https://github.com/rust-lang/rust/pull/38086
2856 [38107]: https://github.com/rust-lang/rust/pull/38107
2857 [38117]: https://github.com/rust-lang/rust/pull/38117
2858 [38134]: https://github.com/rust-lang/rust/pull/38134
2859 [38146]: https://github.com/rust-lang/rust/pull/38146
2860 [38181]: https://github.com/rust-lang/rust/pull/38181
2861 [38182]: https://github.com/rust-lang/rust/pull/38182
2862 [38185]: https://github.com/rust-lang/rust/pull/38185
2863 [38192]: https://github.com/rust-lang/rust/pull/38192
2864 [38279]: https://github.com/rust-lang/rust/pull/38279
2865 [38835]: https://github.com/rust-lang/rust/pull/38835
2866 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2867 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2868 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2869 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2870 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2871 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2872 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2873 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2874 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2875 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2876 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2877 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2878 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2879 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2880 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2881 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2882 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2883 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2884 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2885 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2886 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2887 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2888 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2889 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2890 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2891 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2892 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2893 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2894 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2895 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2896 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2897 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2898 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2899 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2900 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2901 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2902 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2903 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2906 Version 1.14.0 (2016-12-22)
2907 ===========================
2912 * [`..` matches multiple tuple fields in enum variants, structs
2913 and tuples][36843]. [RFC 1492].
2914 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2915 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2916 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2917 dereferencing][36822]
2922 * [Mark enums with non-zero discriminant as non-zero][37224]
2923 * [Lower-case `static mut` names are linted like other
2924 statics and consts][37162]
2925 * [Fix ICE on some macros in const integer positions
2926 (e.g. `[u8; m!()]`)][36819]
2927 * [Improve error message and snippet for "did you mean `x`"][36798]
2928 * [Add a panic-strategy field to the target specification][36794]
2929 * [Include LLVM version in `--version --verbose`][37200]
2931 Compile-time Optimizations
2932 --------------------------
2934 * [Improve macro expansion performance][37569]
2935 * [Shrink `Expr_::ExprInlineAsm`][37445]
2936 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2937 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2938 * [Avoid more allocations when compiling html5ever][37373]
2939 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2940 * [Avoid some allocations in the macro parser][37318]
2941 * [Use a faster deflate setting][37298]
2942 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2943 during interning of slices][37270]
2944 * [Optimize `write_metadata`][37267]
2945 * [Don't process obligation forest cycles when stalled][37231]
2946 * [Avoid many `CrateConfig` clones][37161]
2947 * [Optimize `Substs::super_fold_with`][37108]
2948 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2949 * [Speed up `plug_leaks`][36917]
2954 * [`println!()`, with no arguments, prints newline][36825].
2955 Previously, an empty string was required to achieve the same.
2956 * [`Wrapping` impls standard binary and unary operators, as well as
2957 the `Sum` and `Product` iterators][37356]
2958 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2960 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2961 `VecDeque` iterators][37315]
2962 * [Improve `SipHasher` performance on small values][37312]
2963 * [Add Iterator trait TrustedLen to enable better FromIterator /
2965 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2966 * [`ReadDir` implements `Debug`][37221]
2967 * [Implement `RefUnwindSafe` for atomic types][37178]
2968 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2969 * [Avoid allocations in `Decoder::read_str`][37064]
2970 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2971 * [Impl `Debug` for raw pointers to unsized data][36880]
2972 * [Don't reuse `HashMap` random seeds][37470]
2973 * [The internal memory layout of `HashMap` is more cache-friendly, for
2974 significant improvements in some operations][36692]
2975 * [`HashMap` uses less memory on 32-bit architectures][36595]
2976 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
2981 * [Expose rustc cfg values to build scripts][cargo/3243]
2982 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
2983 * [Fix passing --features when testing multiple packages][cargo/3280]
2984 * [Use a single profile set per workspace][cargo/3249]
2985 * [Load `replace` sections from lock files][cargo/3220]
2986 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
2991 * [rustup is the recommended Rust installation method][1.14rustup]
2992 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
2993 S390x. These are [tier 2] platforms and may have major defects. Follow the
2994 instructions on the website to install, or add the targets to an existing
2995 installation with `rustup target add`. The new target triples are:
2996 - `mips-unknown-linux-gnu`
2997 - `mipsel-unknown-linux-gnu`
2998 - `mips64-unknown-linux-gnuabi64`
2999 - `mips64el-unknown-linux-gnuabi64 `
3000 - `powerpc-unknown-linux-gnu`
3001 - `powerpc64-unknown-linux-gnu`
3002 - `powerpc64le-unknown-linux-gnu`
3003 - `s390x-unknown-linux-gnu `
3004 * This release includes target (std) builds for ARM Linux running MUSL
3005 libc. These are [tier 2] platforms and may have major defects. Add the
3006 following triples to an existing rustup installation with `rustup target add`:
3007 - `arm-unknown-linux-musleabi`
3008 - `arm-unknown-linux-musleabihf`
3009 - `armv7-unknown-linux-musleabihf`
3010 * This release includes [experimental support for WebAssembly][1.14wasm], via
3011 the `wasm32-unknown-emscripten` target. This target is known to have major
3012 defects. Please test, report, and fix.
3013 * rustup no longer installs documentation by default. Run `rustup
3014 component add rust-docs` to install.
3015 * [Fix line stepping in debugger][37310]
3016 * [Enable line number debuginfo in releases][37280]
3021 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3022 * [Add support for Fuchsia OS][37313]
3023 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3028 * [A number of forward-compatibility lints used by the compiler
3029 to gradually introduce language changes have been converted
3030 to deny by default][36894]:
3031 - ["use of inaccessible extern crate erroneously allowed"][36886]
3032 - ["type parameter default erroneously allowed in invalid location"][36887]
3033 - ["detects super or self keywords at the beginning of global path"][36888]
3034 - ["two overlapping inherent impls define an item with the same name
3035 were erroneously allowed"][36889]
3036 - ["floating-point constants cannot be used in patterns"][36890]
3037 - ["constants of struct or enum type can only be used in a pattern if
3038 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3039 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3040 * [Prohibit patterns in trait methods without bodies][37378]
3041 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3042 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3043 * [The `$crate` macro variable is accepted in fewer locations][37213]
3044 * [Impls specifying extra region requirements beyond the trait
3045 they implement are rejected][37167]
3046 * [Enums may not be unsized][37111]. Unsized enums are intended to
3047 work but never have. For now they are forbidden.
3048 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3050 [tier 2]: https://forge.rust-lang.org/platform-support.html
3051 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3052 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3053 [36430]: https://github.com/rust-lang/rust/pull/36430
3054 [36595]: https://github.com/rust-lang/rust/pull/36595
3055 [36595]: https://github.com/rust-lang/rust/pull/36595
3056 [36692]: https://github.com/rust-lang/rust/pull/36692
3057 [36767]: https://github.com/rust-lang/rust/pull/36767
3058 [36794]: https://github.com/rust-lang/rust/pull/36794
3059 [36798]: https://github.com/rust-lang/rust/pull/36798
3060 [36819]: https://github.com/rust-lang/rust/pull/36819
3061 [36822]: https://github.com/rust-lang/rust/pull/36822
3062 [36825]: https://github.com/rust-lang/rust/pull/36825
3063 [36843]: https://github.com/rust-lang/rust/pull/36843
3064 [36880]: https://github.com/rust-lang/rust/pull/36880
3065 [36886]: https://github.com/rust-lang/rust/issues/36886
3066 [36887]: https://github.com/rust-lang/rust/issues/36887
3067 [36888]: https://github.com/rust-lang/rust/issues/36888
3068 [36889]: https://github.com/rust-lang/rust/issues/36889
3069 [36890]: https://github.com/rust-lang/rust/issues/36890
3070 [36891]: https://github.com/rust-lang/rust/issues/36891
3071 [36892]: https://github.com/rust-lang/rust/issues/36892
3072 [36894]: https://github.com/rust-lang/rust/pull/36894
3073 [36917]: https://github.com/rust-lang/rust/pull/36917
3074 [36993]: https://github.com/rust-lang/rust/pull/36993
3075 [37037]: https://github.com/rust-lang/rust/pull/37037
3076 [37064]: https://github.com/rust-lang/rust/pull/37064
3077 [37094]: https://github.com/rust-lang/rust/pull/37094
3078 [37108]: https://github.com/rust-lang/rust/pull/37108
3079 [37111]: https://github.com/rust-lang/rust/pull/37111
3080 [37161]: https://github.com/rust-lang/rust/pull/37161
3081 [37162]: https://github.com/rust-lang/rust/pull/37162
3082 [37167]: https://github.com/rust-lang/rust/pull/37167
3083 [37178]: https://github.com/rust-lang/rust/pull/37178
3084 [37200]: https://github.com/rust-lang/rust/pull/37200
3085 [37213]: https://github.com/rust-lang/rust/pull/37213
3086 [37221]: https://github.com/rust-lang/rust/pull/37221
3087 [37224]: https://github.com/rust-lang/rust/pull/37224
3088 [37230]: https://github.com/rust-lang/rust/pull/37230
3089 [37231]: https://github.com/rust-lang/rust/pull/37231
3090 [37247]: https://github.com/rust-lang/rust/pull/37247
3091 [37267]: https://github.com/rust-lang/rust/pull/37267
3092 [37270]: https://github.com/rust-lang/rust/pull/37270
3093 [37273]: https://github.com/rust-lang/rust/pull/37273
3094 [37280]: https://github.com/rust-lang/rust/pull/37280
3095 [37298]: https://github.com/rust-lang/rust/pull/37298
3096 [37306]: https://github.com/rust-lang/rust/pull/37306
3097 [37310]: https://github.com/rust-lang/rust/pull/37310
3098 [37312]: https://github.com/rust-lang/rust/pull/37312
3099 [37313]: https://github.com/rust-lang/rust/pull/37313
3100 [37315]: https://github.com/rust-lang/rust/pull/37315
3101 [37318]: https://github.com/rust-lang/rust/pull/37318
3102 [37322]: https://github.com/rust-lang/rust/pull/37322
3103 [37326]: https://github.com/rust-lang/rust/pull/37326
3104 [37351]: https://github.com/rust-lang/rust/pull/37351
3105 [37356]: https://github.com/rust-lang/rust/pull/37356
3106 [37367]: https://github.com/rust-lang/rust/pull/37367
3107 [37373]: https://github.com/rust-lang/rust/pull/37373
3108 [37378]: https://github.com/rust-lang/rust/pull/37378
3109 [37389]: https://github.com/rust-lang/rust/pull/37389
3110 [37392]: https://github.com/rust-lang/rust/pull/37392
3111 [37427]: https://github.com/rust-lang/rust/pull/37427
3112 [37439]: https://github.com/rust-lang/rust/pull/37439
3113 [37445]: https://github.com/rust-lang/rust/pull/37445
3114 [37470]: https://github.com/rust-lang/rust/pull/37470
3115 [37569]: https://github.com/rust-lang/rust/pull/37569
3116 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3117 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
3118 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
3119 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
3120 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
3121 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
3122 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
3125 Version 1.13.0 (2016-11-10)
3126 ===========================
3131 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
3132 errors, like the `try!` macro, described in [RFC 0243].
3133 * [Stabilize macros in type position][36014]. Described in [RFC 873].
3134 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
3135 * [Fix `#[derive]` for empty tuple structs/variants][35728]
3136 * [Fix lifetime rules for 'if' conditions][36029]
3137 * [Avoid loading and parsing unconfigured non-inline modules][36482]
3142 * [Add the `-C link-arg` argument][36574]
3143 * [Remove the old AST-based backend from rustc_trans][35764]
3144 * [Don't enable NEON by default on armv7 Linux][35814]
3145 * [Fix debug line number info for macro expansions][35238]
3146 * [Do not emit "class method" debuginfo for types that are not
3147 DICompositeType][36008]
3148 * [Warn about multiple conflicting #[repr] hints][34623]
3149 * [When sizing DST, don't double-count nested struct prefixes][36351]
3150 * [Default RUST_MIN_STACK to 16MiB for now][36505]
3151 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
3152 * [Reject macros with empty repetitions to avoid infinite loop][36721]
3153 * [Expand macros without recursing to avoid stack overflows][36214]
3158 * [Replace macro backtraces with labeled local uses][35702]
3159 * [Improve error message for misplaced doc comments][33922]
3160 * [Buffer unix and lock windows to prevent message interleaving][35975]
3161 * [Update lifetime errors to specifically note temporaries][36171]
3162 * [Special case a few colors for Windows][36178]
3163 * [Suggest `use self` when such an import resolves][36289]
3164 * [Be more specific when type parameter shadows primitive type][36338]
3165 * Many minor improvements
3167 Compile-time Optimizations
3168 --------------------------
3170 * [Compute and cache HIR hashes at beginning][35854]
3171 * [Don't hash types in loan paths][36004]
3172 * [Cache projections in trans][35761]
3173 * [Optimize the parser's last token handling][36527]
3174 * [Only instantiate #[inline] functions in codegen units referencing
3175 them][36524]. This leads to big improvements in cases where crates export
3176 define many inline functions without using them directly.
3177 * [Lazily allocate TypedArena's first chunk][36592]
3178 * [Don't allocate during default HashSet creation][36734]
3185 * [`overflowing_abs`]
3186 * [`RefCell::try_borrow`]
3187 * [`RefCell::try_borrow_mut`]
3192 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
3193 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
3195 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
3196 * [Implement `Debug` for `std::vec::IntoIter`][35707]
3197 * [`CString`: avoid excessive growth just to 0-terminate][35871]
3198 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
3199 * [Use arc4rand on FreeBSD][35884]
3200 * [memrchr: Correct aligned offset computation][35969]
3201 * [Improve Demangling of Rust Symbols][36059]
3202 * [Use monotonic time in condition variables][35048]
3203 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
3204 * [Implement conversion traits for `char`][35755]
3205 * [Fix illegal instruction caused by overflow in channel cloning][36104]
3206 * [Zero first byte of CString on drop][36264]
3207 * [Inherit overflow checks for sum and product][36372]
3208 * [Add missing Eq implementations][36423]
3209 * [Implement `Debug` for `DirEntry`][36631]
3210 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
3212 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3213 * [Implement more traits for `std::io::ErrorKind`][35911]
3214 * [Optimize BinaryHeap bounds checking][36072]
3215 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
3216 `extend_with_element`][36355]
3217 * [Fix overflow checking in unsigned pow()][34942]
3222 * This release includes security fixes to both curl and OpenSSL.
3223 * [Fix transitive doctests when panic=abort][cargo/3021]
3224 * [Add --all-features flag to cargo][cargo/3038]
3225 * [Reject path-based dependencies in `cargo package`][cargo/3060]
3226 * [Don't parse the home directory more than once][cargo/3078]
3227 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
3228 * [Update OpenSSL to 1.0.2j][cargo/3121]
3229 * [Add license and license_file to cargo metadata output][cargo/3110]
3230 * [Make crates-io registry URL optional in config; ignore all changes to
3231 source.crates-io][cargo/3089]
3232 * [Don't download dependencies from other platforms][cargo/3123]
3233 * [Build transitive dev-dependencies when needed][cargo/3125]
3234 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
3235 * [Avoid updating registry when adding existing deps][cargo/3144]
3236 * [Warn about path overrides that won't work][cargo/3136]
3237 * [Use workspaces during `cargo install`][cargo/3146]
3238 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
3239 * [Add --message-format flag][cargo/3000]
3240 * [Pass target environment for rustdoc][cargo/3205]
3241 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
3242 * [Update curl and curl-sys][cargo/3241]
3243 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
3248 * [rustdoc: Add the `--sysroot` argument][36586]
3249 * [rustdoc: Fix a couple of issues with the search results][35655]
3250 * [rustdoc: remove the `!` from macro URLs and titles][35234]
3251 * [gdb: Fix pretty-printing special-cased Rust types][35585]
3252 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
3257 * [Remove unmaintained style guide][35124]
3258 * [Add s390x support][36369]
3259 * [Initial work at Haiku OS support][36727]
3260 * [Add mips-uclibc targets][35734]
3261 * [Crate-ify compiler-rt into compiler-builtins][35021]
3262 * [Add rustc version info (git hash + date) to dist tarball][36213]
3263 * Many documentation improvements
3268 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3269 * [Deny (by default) transmuting from fn item types to pointer-sized
3270 types][34923]. Continuing the long transition to zero-sized fn items,
3272 * [Fix `#[derive]` for empty tuple structs/variants][35728].
3274 * [Issue deprecation warnings for safe accesses to extern statics][36173]
3275 * [Fix lifetime rules for 'if' conditions][36029].
3276 * [Inherit overflow checks for sum and product][36372].
3277 * [Forbid user-defined macros named "macro_rules"][36730].
3279 [33922]: https://github.com/rust-lang/rust/pull/33922
3280 [34623]: https://github.com/rust-lang/rust/pull/34623
3281 [34923]: https://github.com/rust-lang/rust/pull/34923
3282 [34942]: https://github.com/rust-lang/rust/pull/34942
3283 [34982]: https://github.com/rust-lang/rust/pull/34982
3284 [35021]: https://github.com/rust-lang/rust/pull/35021
3285 [35048]: https://github.com/rust-lang/rust/pull/35048
3286 [35074]: https://github.com/rust-lang/rust/pull/35074
3287 [35124]: https://github.com/rust-lang/rust/pull/35124
3288 [35234]: https://github.com/rust-lang/rust/pull/35234
3289 [35238]: https://github.com/rust-lang/rust/pull/35238
3290 [35354]: https://github.com/rust-lang/rust/pull/35354
3291 [35559]: https://github.com/rust-lang/rust/pull/35559
3292 [35585]: https://github.com/rust-lang/rust/pull/35585
3293 [35627]: https://github.com/rust-lang/rust/pull/35627
3294 [35655]: https://github.com/rust-lang/rust/pull/35655
3295 [35702]: https://github.com/rust-lang/rust/pull/35702
3296 [35707]: https://github.com/rust-lang/rust/pull/35707
3297 [35728]: https://github.com/rust-lang/rust/pull/35728
3298 [35734]: https://github.com/rust-lang/rust/pull/35734
3299 [35755]: https://github.com/rust-lang/rust/pull/35755
3300 [35761]: https://github.com/rust-lang/rust/pull/35761
3301 [35764]: https://github.com/rust-lang/rust/pull/35764
3302 [35814]: https://github.com/rust-lang/rust/pull/35814
3303 [35854]: https://github.com/rust-lang/rust/pull/35854
3304 [35871]: https://github.com/rust-lang/rust/pull/35871
3305 [35884]: https://github.com/rust-lang/rust/pull/35884
3306 [35911]: https://github.com/rust-lang/rust/pull/35911
3307 [35969]: https://github.com/rust-lang/rust/pull/35969
3308 [35975]: https://github.com/rust-lang/rust/pull/35975
3309 [36004]: https://github.com/rust-lang/rust/pull/36004
3310 [36008]: https://github.com/rust-lang/rust/pull/36008
3311 [36014]: https://github.com/rust-lang/rust/pull/36014
3312 [36029]: https://github.com/rust-lang/rust/pull/36029
3313 [36059]: https://github.com/rust-lang/rust/pull/36059
3314 [36072]: https://github.com/rust-lang/rust/pull/36072
3315 [36101]: https://github.com/rust-lang/rust/pull/36101
3316 [36104]: https://github.com/rust-lang/rust/pull/36104
3317 [36171]: https://github.com/rust-lang/rust/pull/36171
3318 [36173]: https://github.com/rust-lang/rust/pull/36173
3319 [36178]: https://github.com/rust-lang/rust/pull/36178
3320 [36213]: https://github.com/rust-lang/rust/pull/36213
3321 [36214]: https://github.com/rust-lang/rust/pull/36214
3322 [36264]: https://github.com/rust-lang/rust/pull/36264
3323 [36266]: https://github.com/rust-lang/rust/pull/36266
3324 [36289]: https://github.com/rust-lang/rust/pull/36289
3325 [36338]: https://github.com/rust-lang/rust/pull/36338
3326 [36351]: https://github.com/rust-lang/rust/pull/36351
3327 [36355]: https://github.com/rust-lang/rust/pull/36355
3328 [36369]: https://github.com/rust-lang/rust/pull/36369
3329 [36372]: https://github.com/rust-lang/rust/pull/36372
3330 [36423]: https://github.com/rust-lang/rust/pull/36423
3331 [36482]: https://github.com/rust-lang/rust/pull/36482
3332 [36505]: https://github.com/rust-lang/rust/pull/36505
3333 [36524]: https://github.com/rust-lang/rust/pull/36524
3334 [36527]: https://github.com/rust-lang/rust/pull/36527
3335 [36551]: https://github.com/rust-lang/rust/pull/36551
3336 [36574]: https://github.com/rust-lang/rust/pull/36574
3337 [36586]: https://github.com/rust-lang/rust/pull/36586
3338 [36592]: https://github.com/rust-lang/rust/pull/36592
3339 [36631]: https://github.com/rust-lang/rust/pull/36631
3340 [36639]: https://github.com/rust-lang/rust/pull/36639
3341 [36721]: https://github.com/rust-lang/rust/pull/36721
3342 [36727]: https://github.com/rust-lang/rust/pull/36727
3343 [36730]: https://github.com/rust-lang/rust/pull/36730
3344 [36734]: https://github.com/rust-lang/rust/pull/36734
3345 [36754]: https://github.com/rust-lang/rust/pull/36754
3346 [36995]: https://github.com/rust-lang/rust/pull/36995
3347 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
3348 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
3349 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3350 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
3351 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
3352 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
3353 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
3354 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
3355 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
3356 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
3357 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
3358 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
3359 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
3360 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
3361 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
3362 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
3363 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
3364 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
3365 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3366 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3367 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3368 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3369 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3370 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3371 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3372 [rustup]: https://www.rustup.rs
3373 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3374 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3375 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3376 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3377 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3378 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3379 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3382 Version 1.12.1 (2016-10-20)
3383 ===========================
3388 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3389 * [Confusion with double negation and booleans][36856]
3390 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3391 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3392 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3393 * [Corrupted memory after updated to 1.12][36936]
3394 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3395 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3396 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3398 [36381]: https://github.com/rust-lang/rust/issues/36381
3399 [36856]: https://github.com/rust-lang/rust/issues/36856
3400 [36875]: https://github.com/rust-lang/rust/issues/36875
3401 [36924]: https://github.com/rust-lang/rust/issues/36924
3402 [36926]: https://github.com/rust-lang/rust/issues/36926
3403 [36936]: https://github.com/rust-lang/rust/issues/36936
3404 [37026]: https://github.com/rust-lang/rust/issues/37026
3405 [37112]: https://github.com/rust-lang/rust/issues/37112
3406 [37153]: https://github.com/rust-lang/rust/issues/37153
3409 Version 1.12.0 (2016-09-29)
3410 ===========================
3415 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3416 This translation pass is far simpler than the previous AST->LLVM pass, and
3417 creates opportunities to perform new optimizations directly on the MIR. It
3418 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3419 * [`rustc` presents a new, more readable error format, along with
3420 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3421 Most common editors supporting Rust have been updated to work with it. It was
3422 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3427 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3428 This translation pass is far simpler than the previous AST->LLVM pass, and
3429 creates opportunities to perform new optimizations directly on the MIR. It
3430 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3431 * [Print the Rust target name, not the LLVM target name, with
3432 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3433 * [The computation of `TypeId` is correct in some cases where it was previously
3434 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3435 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3436 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3437 `--print relocation-models`, and `--print code-models` print the available
3438 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3439 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3440 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3441 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3442 These targets produce statically-linked binaries. There are no binary release
3448 * [`rustc` presents a new, more readable error format, along with
3449 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3450 Most common editors supporting Rust have been updated to work with it. It was
3451 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3452 * [In error descriptions, references are now described in plain English,
3453 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3454 * [In error type descriptions, unknown numeric types are named `{integer}` or
3455 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3456 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3461 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3462 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3463 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3464 useful](https://github.com/rust-lang/rust/pull/34908)
3465 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3466 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3467 * [Semicolons are properly required as statement delimiters inside
3468 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3469 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3474 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3475 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3476 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3477 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3478 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3479 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3480 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3481 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3482 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3483 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3484 Both on Unix and Windows.
3485 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3486 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3487 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3488 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3489 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3490 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3491 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3492 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3497 * [The `format!` macro and friends now allow a single argument to be formatted
3498 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3499 * [The lifetime bounds on `[T]::binary_search_by` and
3500 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3501 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3502 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3503 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3504 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3505 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3506 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3507 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3508 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3509 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3510 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3511 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3512 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3513 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3514 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3515 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3516 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3517 * [`mpsc::sync_channel` `Receiver`s return any available message before
3518 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3519 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3520 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3525 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3526 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3527 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3528 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3529 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3530 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3531 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3532 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3533 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3534 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3535 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3536 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3537 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3538 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3539 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3540 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3545 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3546 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3551 * [Test binaries now support a `--test-threads` argument to specify the number
3552 of threads used to run tests, and which acts the same as the
3553 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3554 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3555 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3556 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3557 * [Rust releases now come with source packages that can be installed by rustup
3558 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3559 The resulting source code can be used by tools and IDES, located in the
3560 sysroot under `lib/rustlib/src`.
3565 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3566 * Many minor improvements to the documentation.
3567 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3572 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3573 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3574 * [When formatting strings, if "precision" is specified, the "fill",
3575 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3576 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3579 Version 1.11.0 (2016-08-18)
3580 ===========================
3585 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3586 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3587 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3588 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3589 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3594 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3595 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3596 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3597 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3598 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3599 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3600 (in libcore - previously stabilized in libstd)
3601 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3602 (in libcore - previously stabilized in libstd)
3603 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3604 (in libcore - previously stabilized in libstd)
3605 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3606 (in libcore - previously stabilized in libstd)
3607 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3608 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3609 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3610 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3615 * [The `thread_local!` macro supports multiple definitions in a single
3616 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3617 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3618 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3619 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3620 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3621 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3622 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3623 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3628 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3629 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3630 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3631 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3632 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3633 and `-vv` prints warnings for all crates.
3634 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3635 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3636 This provides room for expansion by arbitrary tools.
3637 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3638 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3639 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3640 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3641 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3642 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3643 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3648 * [Caching projections speeds up type check dramatically for some
3649 workloads](https://github.com/rust-lang/rust/pull/33816)
3650 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3651 This hasher is faster, but is believed to provide sufficient
3652 protection from collision attacks.
3653 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3658 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3659 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3660 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3661 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3662 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3667 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3668 * [When emitting debug info, rustc emits frame pointers for closures,
3669 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3670 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3671 * Many more errors have been given error codes and extended
3673 * API documentation continues to be improved, with many new examples
3678 * [rustc no longer hangs when dependencies recursively re-export
3679 submodules](https://github.com/rust-lang/rust/pull/34542)
3680 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3681 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3682 rewritten](https://github.com/rust-lang/rust/pull/33895)
3683 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3684 No targets use this yet, but it works toward AVR support.
3689 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3690 * [The new follow-set rules that place restrictions on `macro_rules!`
3691 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3692 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3693 and has been a warning since 1.10.
3694 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3695 This causes breakage in some corner cases.
3698 Version 1.10.0 (2016-07-07)
3699 ===========================
3704 * [Allow `concat_idents!` in type positions as well as in expression
3705 positions](https://github.com/rust-lang/rust/pull/33735).
3706 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3707 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3708 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3709 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3710 * [`panic!` can be converted to a runtime abort with the
3711 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3712 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3713 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3714 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3715 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3716 Note that Cargo does not yet directly support cdylibs.
3721 * `os::windows::fs::OpenOptionsExt::access_mode`
3722 * `os::windows::fs::OpenOptionsExt::share_mode`
3723 * `os::windows::fs::OpenOptionsExt::custom_flags`
3724 * `os::windows::fs::OpenOptionsExt::attributes`
3725 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3726 * `os::unix::fs::OpenOptionsExt::custom_flags`
3727 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3728 * `Default for sync::Weak`
3729 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3730 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3731 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3732 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3733 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3734 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3735 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3736 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3737 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3738 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3739 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3740 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3741 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3742 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3743 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3744 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3745 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3746 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3747 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3748 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3749 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3750 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3751 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3752 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3753 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3754 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3755 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3756 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3757 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3758 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3759 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3760 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3761 * Read/Write/RawFd impls for `UnixStream`
3762 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3763 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3764 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3765 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3766 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3767 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3768 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3769 * RawFd impls for `UnixListener`
3770 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3771 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3772 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3773 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3774 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3775 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3776 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3777 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3778 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3779 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3780 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3781 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3782 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3783 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3784 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3785 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3786 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3787 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3788 * RawFd impls for `UnixDatagram`
3789 * `{BTree,Hash}Map::values_mut`
3790 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3795 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3796 The semantics of this minor method are subtle and probably not what
3798 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3799 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3800 will fall back to `/dev/urandom` temporarily to avoid blocking
3801 during early boot](https://github.com/rust-lang/rust/pull/33086).
3802 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3803 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3804 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3805 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3806 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3807 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3808 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3812 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3813 This controls the runtime behavior of the `panic!` macro
3814 and can be either "unwind" (the default), or "abort".
3815 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3816 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3817 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3818 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3819 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3820 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3821 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3822 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3823 By default they are retried twice, which can be customized with the
3824 `net.retry` value in `.cargo/config`.
3825 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3826 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3827 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3828 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3829 Makes it possible to install multiple crates in parallel.
3830 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3831 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3832 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3833 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3834 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3835 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3840 * [rustc memory usage was reduced by refactoring the context used for
3841 type checking](https://github.com/rust-lang/rust/pull/33425).
3842 * [Speed up creation of `HashMap`s by caching the random keys used
3843 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3844 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3845 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3846 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3847 10x faster than the previous lookup tables.
3848 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3853 * Many incremental improvements to documentation and rustdoc.
3854 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3855 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3856 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3857 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3858 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3859 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3860 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3865 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3866 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3867 * [`std` no longer prints backtraces on platforms where the running
3868 module must be loaded with `env::current_exe`, which can't be relied
3869 on](https://github.com/rust-lang/rust/pull/33554).
3870 * This release includes std binaries for the i586-unknown-linux-gnu,
3871 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3872 i586 target is for old x86 hardware without SSE2, and the armv7
3873 target is for Android running on modern ARM architectures.
3874 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3875 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3876 * [On Unix the runtime aborts by calling `libc::abort` instead of
3877 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3878 * [Rust is now bootstrapped from the previous release of Rust,
3879 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3884 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3885 * [`target_env` for Linux ARM targets is just `gnu`, not
3886 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3887 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3888 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3889 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3890 Affects how macros are parsed.
3891 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3892 * [Feature-gated attributes on macro-generated macro invocations are
3893 now rejected](https://github.com/rust-lang/rust/pull/32791).
3894 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3895 This caused some minor changes to type inference.
3898 Version 1.9.0 (2016-05-26)
3899 ==========================
3904 * The `#[deprecated]` attribute when applied to an API will generate
3905 warnings when used. The warnings may be suppressed with
3906 `#[allow(deprecated)]`. [RFC 1270].
3907 * [`fn` item types are zero sized, and each `fn` names a unique
3908 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3909 `transmute` on a `fn` type will generate a warning for a few cycles,
3910 then will be converted to an error.
3911 * [Field and method resolution understand visibility, so private
3912 fields and methods cannot prevent the proper use of public fields
3913 and methods][1.9fv].
3914 * [The parser considers unicode codepoints in the
3915 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3921 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3922 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3923 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3924 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3925 * [`str::is_char_boundary`]
3926 * [`<*const T>::as_ref`]
3927 * [`<*mut T>::as_ref`]
3928 * [`<*mut T>::as_mut`]
3929 * [`AsciiExt::make_ascii_uppercase`]
3930 * [`AsciiExt::make_ascii_lowercase`]
3931 * [`char::decode_utf16`]
3932 * [`char::DecodeUtf16`]
3933 * [`char::DecodeUtf16Error`]
3934 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3935 * [`BTreeSet::take`]
3936 * [`BTreeSet::replace`]
3939 * [`HashSet::replace`]
3941 * [`OsString::with_capacity`]
3942 * [`OsString::clear`]
3943 * [`OsString::capacity`]
3944 * [`OsString::reserve`]
3945 * [`OsString::reserve_exact`]
3946 * [`OsStr::is_empty`]
3948 * [`std::os::unix::thread`]
3951 * [`JoinHandleExt::as_pthread_t`]
3952 * [`JoinHandleExt::into_pthread_t`]
3953 * [`HashSet::hasher`]
3954 * [`HashMap::hasher`]
3955 * [`CommandExt::exec`]
3956 * [`File::try_clone`]
3957 * [`SocketAddr::set_ip`]
3958 * [`SocketAddr::set_port`]
3959 * [`SocketAddrV4::set_ip`]
3960 * [`SocketAddrV4::set_port`]
3961 * [`SocketAddrV6::set_ip`]
3962 * [`SocketAddrV6::set_port`]
3963 * [`SocketAddrV6::set_flowinfo`]
3964 * [`SocketAddrV6::set_scope_id`]
3965 * [`slice::copy_from_slice`]
3966 * [`ptr::read_volatile`]
3967 * [`ptr::write_volatile`]
3968 * [`OpenOptions::create_new`]
3969 * [`TcpStream::set_nodelay`]
3970 * [`TcpStream::nodelay`]
3971 * [`TcpStream::set_ttl`]
3972 * [`TcpStream::ttl`]
3973 * [`TcpStream::set_only_v6`]
3974 * [`TcpStream::only_v6`]
3975 * [`TcpStream::take_error`]
3976 * [`TcpStream::set_nonblocking`]
3977 * [`TcpListener::set_ttl`]
3978 * [`TcpListener::ttl`]
3979 * [`TcpListener::set_only_v6`]
3980 * [`TcpListener::only_v6`]
3981 * [`TcpListener::take_error`]
3982 * [`TcpListener::set_nonblocking`]
3983 * [`UdpSocket::set_broadcast`]
3984 * [`UdpSocket::broadcast`]
3985 * [`UdpSocket::set_multicast_loop_v4`]
3986 * [`UdpSocket::multicast_loop_v4`]
3987 * [`UdpSocket::set_multicast_ttl_v4`]
3988 * [`UdpSocket::multicast_ttl_v4`]
3989 * [`UdpSocket::set_multicast_loop_v6`]
3990 * [`UdpSocket::multicast_loop_v6`]
3991 * [`UdpSocket::set_multicast_ttl_v6`]
3992 * [`UdpSocket::multicast_ttl_v6`]
3993 * [`UdpSocket::set_ttl`]
3994 * [`UdpSocket::ttl`]
3995 * [`UdpSocket::set_only_v6`]
3996 * [`UdpSocket::only_v6`]
3997 * [`UdpSocket::join_multicast_v4`]
3998 * [`UdpSocket::join_multicast_v6`]
3999 * [`UdpSocket::leave_multicast_v4`]
4000 * [`UdpSocket::leave_multicast_v6`]
4001 * [`UdpSocket::take_error`]
4002 * [`UdpSocket::connect`]
4003 * [`UdpSocket::send`]
4004 * [`UdpSocket::recv`]
4005 * [`UdpSocket::set_nonblocking`]
4010 * [`std::sync::Once` is poisoned if its initialization function
4012 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4013 * [Most types implement `fmt::Debug`][1.9db].
4014 * [The default buffer size used by `BufReader` and `BufWriter` was
4015 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4016 used by other languages.
4017 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4018 `Duration` additionally implements `*=` and `/=`][1.9ta].
4019 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4020 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4021 * [`Chain` implements `BufRead`][1.9ch].
4022 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4027 * [Cargo can now run concurrently][1.9cc].
4028 * [Top-level overrides allow specific revisions of crates to be
4029 overridden through the entire crate graph][1.9ct]. This is intended
4030 to make upgrades easier for large projects, by allowing crates to be
4031 forked temporarily until they've been upgraded and republished.
4032 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4033 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4034 on the commandline][1.9cf]. `rustc` arguments can also be specified
4035 in the `build.rustflags` configuration key.
4040 * [The time complexity of comparing variables for equivalence during type
4041 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4042 to major compilation time improvement in some scenarios.
4043 * [`ToString` is specialized for `str`, giving it the same performance
4044 as `to_owned`][1.9ts].
4045 * [Spawning processes with `Command::output` no longer creates extra
4047 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4048 for C-like enums][1.9cl].
4053 * [Passing the `--quiet` flag to a test runner will produce
4054 much-abbreviated output][1.9q].
4055 * The Rust Project now publishes std binaries for the
4056 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4057 `i586-pc-windows-msvc` targets.
4062 * [`std::sync::Once` is poisoned if its initialization function
4064 * [It is illegal to define methods with the same name in overlapping
4065 inherent `impl` blocks][1.9sn].
4066 * [`fn` item types are zero sized, and each `fn` names a unique
4067 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4068 `transmute` on a `fn` type will generate a warning for a few cycles,
4069 then will be converted to an error.
4070 * [Improvements to const evaluation may trigger new errors when integer
4071 literals are out of range][1.9ce].
4074 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4075 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4076 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4077 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4078 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4079 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4080 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4081 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4082 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4083 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4084 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4085 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4086 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4087 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4088 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4089 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4090 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4091 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4092 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4093 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4094 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4095 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4096 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4097 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4098 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4099 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4100 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4101 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4102 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4103 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
4104 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
4105 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
4106 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
4107 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
4108 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
4109 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
4110 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
4111 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
4112 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
4113 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
4114 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
4115 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
4116 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
4117 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
4118 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
4119 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
4120 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
4121 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
4122 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
4123 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
4124 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
4125 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
4126 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
4127 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
4128 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
4129 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
4130 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
4131 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
4132 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
4133 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
4134 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4135 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4136 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4137 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4138 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4139 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4140 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
4141 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4142 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
4143 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4144 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4145 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4146 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4147 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4148 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
4149 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
4150 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
4151 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
4152 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
4153 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
4154 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
4155 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
4156 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
4157 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
4158 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
4159 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
4160 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
4161 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
4162 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
4163 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
4164 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
4165 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
4166 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
4167 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
4168 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
4169 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
4170 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
4171 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
4172 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
4173 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
4174 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
4175 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
4176 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
4177 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
4178 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
4179 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
4180 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
4181 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
4182 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
4183 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
4186 Version 1.8.0 (2016-04-14)
4187 ==========================
4192 * Rust supports overloading of compound assignment statements like
4193 `+=` by implementing the [`AddAssign`], [`SubAssign`],
4194 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
4195 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
4197 * Empty structs can be defined with braces, as in `struct Foo { }`, in
4198 addition to the non-braced form, `struct Foo;`. [RFC 218].
4204 * [`str::encode_utf16`][] (renamed from `utf16_units`)
4205 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
4208 * [`ptr::drop_in_place`]
4210 * [`time::SystemTime`]
4212 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
4213 * [`Instant::elapsed`]
4214 * [`SystemTime::now`]
4215 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
4216 * [`SystemTime::elapsed`]
4217 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
4218 * [`SystemTimeError`]
4219 * [`SystemTimeError::duration`]
4220 * Various impls for `SystemTimeError`
4222 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
4223 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
4224 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
4225 * [The `write!` and `writeln!` macros correctly emit errors if any of
4226 their arguments can't be formatted][1.8w].
4227 * [Various I/O functions support large files on 32-bit Linux][1.8l].
4228 * [The Unix-specific `raw` modules, which contain a number of
4229 redefined C types are deprecated][1.8r], including `os::raw::unix`,
4230 `os::raw::macos`, and `os::raw::linux`. These modules defined types
4231 such as `ino_t` and `dev_t`. The inconsistency of these definitions
4232 across platforms was making it difficult to implement `std`
4233 correctly. Those that need these definitions should use the `libc`
4235 * The Unix-specific `MetadataExt` traits, including
4236 `os::unix::fs::MetadataExt`, which expose values such as inode
4237 numbers [no longer return platform-specific types][1.8r], but
4238 instead return widened integers. [RFC 1415].
4239 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
4240 * [Atomic loads and stores are not volatile][1.8a].
4241 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
4246 * [Inlining hash functions lead to a 3% compile-time improvement in
4247 some workloads][1.8h].
4248 * When using jemalloc, its symbols are [unprefixed so that it
4249 overrides the libc malloc implementation][1.8h]. This means that for
4250 rustc, LLVM is now using jemalloc, which results in a 6%
4251 compile-time improvement on a specific workload.
4252 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
4257 * [32-bit MSVC builds finally implement unwinding][1.8ms].
4258 i686-pc-windows-msvc is now considered a tier-1 platform.
4259 * [The `--print targets` flag prints a list of supported targets][1.8t].
4260 * [The `--print cfg` flag prints the `cfg`s defined for the current
4262 * [`rustc` can be built with an new Cargo-based build system, written
4263 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
4264 build system. To enable it configure with `configure --rustbuild`.
4265 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
4266 variants while also indicating the total number of missing variants
4267 if more than 3][1.8m].
4268 * [Executable stacks are disabled on Linux and BSD][1.8nx].
4269 * The Rust Project now publishes binary releases of the standard
4270 library for a number of tier-2 targets:
4271 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
4272 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
4273 `x86_64-rumprun-netbsd`. These can be installed with
4274 tools such as [multirust][1.8mr].
4279 * [`cargo init` creates a new Cargo project in the current
4280 directory][1.8ci]. It is otherwise like `cargo new`.
4281 * [Cargo has configuration keys for `-v` and
4282 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
4283 `[term]` section of `.cargo/config`.
4284 * [Configuration keys that evaluate to strings or integers can be set
4285 via environment variables][1.8ce]. For example the `build.jobs` key
4286 can be set via `CARGO_BUILD_JOBS`. Environment variables take
4287 precedence over config files.
4288 * [Target-specific dependencies support Rust `cfg` syntax for
4289 describing targets][1.8cfg] so that dependencies for multiple
4290 targets can be specified together. [RFC 1361].
4291 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
4292 `RUSTDOC` take precedence over the `build.target-dir`,
4293 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
4294 * [The child process tree is killed on Windows when Cargo is
4296 * [The `build.target` configuration value sets the target platform,
4297 like `--target`][1.8ct].
4302 * [Unstable compiler flags have been further restricted][1.8u]. Since
4303 1.0 `-Z` flags have been considered unstable, and other flags that
4304 were considered unstable additionally required passing `-Z
4305 unstable-options` to access. Unlike unstable language and library
4306 features though, these options have been accessible on the stable
4307 release channel. Going forward, *new unstable flags will not be
4308 available on the stable release channel*, and old unstable flags
4309 will warn about their usage. In the future, all unstable flags will
4310 be unavailable on the stable release channel.
4311 * [It is no longer possible to `match` on empty enum variants using
4312 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
4313 * The Unix-specific `MetadataExt` traits, including
4314 `os::unix::fs::MetadataExt`, which expose values such as inode
4315 numbers [no longer return platform-specific types][1.8r], but
4316 instead return widened integers. [RFC 1415].
4317 * [Modules sourced from the filesystem cannot appear within arbitrary
4318 blocks, but only within other modules][1.8mf].
4319 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
4320 * On Unix, [stack overflow triggers a runtime abort instead of a
4322 * [`Command::spawn` and its equivalents return an error if any of
4323 its command-line arguments contain interior `NUL`s][1.8n].
4324 * [Tuple and unit enum variants from other crates are in the type
4326 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
4327 type instead of `.a` files][1.8st]. Additionally, for the MSVC
4328 toolchain, `rustc` emits import libraries named `foo.dll.lib`
4329 instead of `foo.lib`.
4332 [1.8a]: https://github.com/rust-lang/rust/pull/30962
4333 [1.8b]: https://github.com/rust-lang/rust/pull/31123
4334 [1.8c]: https://github.com/rust-lang/rust/pull/31530
4335 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
4336 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
4337 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
4338 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
4339 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
4340 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
4341 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
4342 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
4343 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
4344 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
4345 [1.8h]: https://github.com/rust-lang/rust/pull/31460
4346 [1.8l]: https://github.com/rust-lang/rust/pull/31668
4347 [1.8m]: https://github.com/rust-lang/rust/pull/31020
4348 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
4349 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
4350 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
4351 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
4352 [1.8n]: https://github.com/rust-lang/rust/pull/31056
4353 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
4354 [1.8r]: https://github.com/rust-lang/rust/pull/31551
4355 [1.8so]: https://github.com/rust-lang/rust/pull/31333
4356 [1.8st]: https://github.com/rust-lang/rust/pull/29520
4357 [1.8t]: https://github.com/rust-lang/rust/pull/31358
4358 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
4359 [1.8u]: https://github.com/rust-lang/rust/pull/31793
4360 [1.8v]: https://github.com/rust-lang/rust/pull/31757
4361 [1.8w]: https://github.com/rust-lang/rust/pull/31904
4362 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
4363 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
4364 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
4365 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4366 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4367 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4368 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4369 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4370 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4371 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4372 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4373 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4374 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4375 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4376 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4377 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4378 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4379 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4380 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4381 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4382 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4383 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4384 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4385 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4386 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4387 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4388 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4389 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4390 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4391 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4394 Version 1.7.0 (2016-03-03)
4395 ==========================
4402 * [`Path::strip_prefix`][] (renamed from relative_from)
4403 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4405 * [`Ipv4Addr::is_loopback`]
4406 * [`Ipv4Addr::is_private`]
4407 * [`Ipv4Addr::is_link_local`]
4408 * [`Ipv4Addr::is_multicast`]
4409 * [`Ipv4Addr::is_broadcast`]
4410 * [`Ipv4Addr::is_documentation`]
4412 * [`Ipv6Addr::is_unspecified`]
4413 * [`Ipv6Addr::is_loopback`]
4414 * [`Ipv6Addr::is_multicast`]
4417 * [`Vec::as_mut_slice`]
4419 * [`String::as_str`]
4420 * [`String::as_mut_str`]
4422 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4424 * `<[T]>::`[`sort_by_key`]
4425 * checked, saturated, and overflowing operations
4426 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4427 * [`i32::saturating_mul`]
4428 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4429 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4430 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4431 * [`u32::saturating_mul`]
4432 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4433 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4434 * and checked, saturated, and overflowing operations for other primitive types
4436 * [`ffi::IntoStringError`]
4437 * [`CString::into_string`]
4438 * [`CString::into_bytes`]
4439 * [`CString::into_bytes_with_nul`]
4440 * `From<CString> for Vec<u8>`
4442 * [`IntoStringError::into_cstring`]
4443 * [`IntoStringError::utf8_error`]
4444 * `Error for IntoStringError`
4446 * [`std::hash::BuildHasher`]
4447 * [`BuildHasher::Hasher`]
4448 * [`BuildHasher::build_hasher`]
4449 * [`std::hash::BuildHasherDefault`]
4450 * [`HashMap::with_hasher`]
4451 * [`HashMap::with_capacity_and_hasher`]
4452 * [`HashSet::with_hasher`]
4453 * [`HashSet::with_capacity_and_hasher`]
4454 * [`std::collections::hash_map::RandomState`]
4455 * [`RandomState::new`]
4456 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4457 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4458 from bytes is faster.
4459 * [The performance of `LineWriter` (and thus `io::stdout`) was
4460 improved by using `memchr` to search for newlines][1.7m].
4461 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4462 `f64` variants were stabilized previously.
4463 * [`BTreeMap` was rewritten to use less memory and improve the performance
4464 of insertion and iteration, the latter by as much as 5x][1.7bm].
4465 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4466 covariant over their contained type][1.7bt].
4467 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4468 over their contained type][1.7ll].
4469 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4471 * [`Any` is implemented for unsized types][1.7a].
4472 * [`Hash` is implemented for `Duration`][1.7h].
4477 * [When running tests with `--test`, rustdoc will pass `--cfg`
4478 arguments to the compiler][1.7dt].
4479 * [The compiler is built with RPATH information by default][1.7rpa].
4480 This means that it will be possible to run `rustc` when installed in
4481 unusual configurations without configuring the dynamic linker search
4483 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4484 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4485 over `LD_LIBRARY_PATH`.
4490 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4491 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4492 * [The `rerun-if-changed` build script directive no longer causes the
4493 build script to incorrectly run twice in certain scenarios][1.7rr].
4498 * Soundness fixes to the interactions between associated types and
4499 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4500 code that violates the new rules. This is a significant change that
4501 is known to break existing code, so it has emitted warnings for the
4502 new error cases since 1.4 to give crate authors time to adapt. The
4503 details of what is changing are subtle; read the RFC for more.
4504 * [Several bugs in the compiler's visibility calculations were
4505 fixed][1.7v]. Since this was found to break significant amounts of
4506 code, the new errors will be emitted as warnings for several release
4507 cycles, under the `private_in_public` lint.
4508 * Defaulted type parameters were accidentally accepted in positions
4509 that were not intended. In this release, [defaulted type parameters
4510 appearing outside of type definitions will generate a
4511 warning][1.7d], which will become an error in future releases.
4512 * [Parsing "." as a float results in an error instead of 0][1.7p].
4513 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4514 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4516 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4517 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4518 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4519 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4520 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4521 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4522 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4523 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4524 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4525 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4526 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4527 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4528 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4529 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4530 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4531 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4532 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4533 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4534 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4535 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4536 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4537 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4538 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4539 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4540 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4541 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4542 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4543 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4544 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4545 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4546 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4547 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4548 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4549 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4550 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4551 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4552 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4553 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4554 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4555 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4556 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4557 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4558 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4559 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4560 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4561 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4562 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4563 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4564 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4565 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4566 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4567 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4568 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4569 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4570 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4571 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4572 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4573 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4574 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4575 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4576 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4577 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4578 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4579 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4580 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4581 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4582 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4583 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4584 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4585 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4586 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4587 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4588 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4589 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4590 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4591 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4592 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4593 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4594 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4597 Version 1.6.0 (2016-01-21)
4598 ==========================
4603 * The `#![no_std]` attribute causes a crate to not be linked to the
4604 standard library, but only the [core library][1.6co], as described
4605 in [RFC 1184]. The core library defines common types and traits but
4606 has no platform dependencies whatsoever, and is the basis for Rust
4607 software in environments that cannot support a full port of the
4608 standard library, such as operating systems. Most of the core
4609 library is now stable.
4615 [`Read::read_exact`],
4616 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4617 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4618 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4619 [`os::unix::fs::DirBuilderExt`],
4620 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4621 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4622 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4623 [`collections::hash_map::Drain`],
4624 [`collections::hash_map::HashMap::drain`],
4625 [`collections::hash_set::Drain`],
4626 [`collections::hash_set::HashSet::drain`],
4627 [`collections::binary_heap::Drain`],
4628 [`collections::binary_heap::BinaryHeap::drain`],
4629 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4630 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4631 [`RwLock::into_inner`],
4632 [`Iterator::min_by_key`][] (renamed from `min_by`),
4633 [`Iterator::max_by_key`][] (renamed from `max_by`).
4634 * The [core library][1.6co] is stable, as are most of its APIs.
4635 * [The `assert_eq!` macro supports arguments that don't implement
4636 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4638 * Several timer functions that take duration in milliseconds [are
4639 deprecated in favor of those that take `Duration`][1.6ms]. These
4640 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4641 `thread::park_timeout_ms`.
4642 * The algorithm by which `Vec` reserves additional elements was
4643 [tweaked to not allocate excessive space][1.6a] while still growing
4645 * `From` conversions are [implemented from integers to floats][1.6f]
4646 in cases where the conversion is lossless. Thus they are not
4647 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4648 or `f64`. They are also not implemented for `isize` and `usize`
4649 because the implementations would be platform-specific. `From` is
4650 also implemented from `f32` to `f64`.
4651 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4652 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4653 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4654 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4656 * Sorting slices that are already sorted [is 50% faster in some
4662 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4663 * Cargo build scripts can specify their dependencies by emitting the
4664 [`rerun-if-changed`][1.6rr] key.
4665 * crates.io will reject publication of crates with dependencies that
4666 have a wildcard version constraint. Crates with wildcard
4667 dependencies were seen to cause a variety of problems, as described
4668 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4670 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4671 release folder. A variety of artifacts that Cargo failed to clean
4672 are now correctly deleted.
4677 * The `unreachable_code` lint [warns when a function call's argument
4679 * The parser indicates [failures that may be caused by
4680 confusingly-similar Unicode characters][1.6uc]
4681 * Certain macro errors [are reported at definition time][1.6m], not
4687 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4688 environment variable when locating crates. This was a pre-cargo
4689 feature for integrating with the package manager that was
4690 accidentally never removed.
4691 * [A number of bugs were fixed in the privacy checker][1.6p] that
4692 could cause previously-accepted code to break.
4693 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4694 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4695 struct pattern syntax (`Foo(..)`) can no longer be used to match
4696 unit structs. This is a warning now, but will become an error in
4697 future releases. Patterns that share the same name as a const are
4699 * A bug was fixed that causes [rustc not to apply default type
4700 parameters][1.6xc] when resolving certain method implementations of
4701 traits defined in other crates.
4703 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4704 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4705 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4706 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4707 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4708 [1.6co]: http://doc.rust-lang.org/core/index.html
4709 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4710 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4711 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4712 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4713 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4714 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4715 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4716 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4717 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4718 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4719 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4720 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4721 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4722 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4723 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4724 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4725 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4726 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4727 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4728 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4729 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4730 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4731 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4732 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4733 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4734 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4735 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4736 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4737 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4738 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4739 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4740 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4741 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4742 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4743 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4744 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4745 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4746 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4747 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4748 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4749 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4752 Version 1.5.0 (2015-12-10)
4753 ==========================
4755 * ~700 changes, numerous bugfixes
4761 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4762 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4763 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4764 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4765 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4766 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4767 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4768 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4769 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4770 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4771 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4772 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4773 [`Path::read_link`], [`Path::symlink_metadata`],
4774 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4775 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4776 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4777 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4778 [`slice::split_first_mut`], [`slice::split_first`],
4779 [`slice::split_last_mut`], [`slice::split_last`],
4780 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4781 [`str::MatchIndices`], [`str::RMatchIndices`],
4782 [`str::match_indices`], [`str::rmatch_indices`],
4783 [`str::slice_mut_unchecked`], [`string::ParseError`].
4784 * Rust applications hosted on crates.io can be installed locally to
4785 `~/.cargo/bin` with the [`cargo install`] command. Among other
4786 things this makes it easier to augment Cargo with new subcommands:
4787 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4788 invoked as `cargo foo`.
4789 * Crates with wildcard (`*`) dependencies will [emit warnings when
4790 published][1.5w]. In 1.6 it will no longer be possible to publish
4791 crates with wildcard dependencies.
4796 * The rules determining when a particular lifetime must outlive
4797 a particular value (known as '[dropck]') have been [modified
4798 to not rely on parametricity][1.5p].
4799 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4800 and `Arc`][1.5a]. Because these smart pointer types implement
4801 `Deref`, this causes breakage in cases where the interior type
4802 contains methods of the same name.
4803 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4804 that they could drop their content. Soundness fix.
4805 * All method invocations are [properly checked][1.5wf1] for
4806 [well-formedness][1.5wf2]. Soundness fix.
4807 * Traits whose supertraits contain `Self` are [not object
4808 safe][1.5o]. Soundness fix.
4809 * Target specifications support a [`no_default_libraries`][1.5nd]
4810 setting that controls whether `-nodefaultlibs` is passed to the
4811 linker, and in turn the `is_like_windows` setting no longer affects
4812 the `-nodefaultlibs` flag.
4813 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4814 * The `#[inline]` and `#[repr]` attributes [can only appear
4815 in valid locations][1.5at].
4816 * Native libraries linked from the local crate are [passed to
4817 the linker before native libraries from upstream crates][1.5nl].
4818 * Two rarely-used attributes, `#[no_debug]` and
4819 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4820 * Negation of unsigned integers, which has been a warning for
4821 several releases, [is now behind a feature gate and will
4822 generate errors][1.5nu].
4823 * The parser accidentally accepted visibility modifiers on
4824 enum variants, a bug [which has been fixed][1.5ev].
4825 * [A bug was fixed that allowed `use` statements to import unstable
4831 * When evaluating expressions at compile-time that are not
4832 compile-time constants (const-evaluating expressions in non-const
4833 contexts), incorrect code such as overlong bitshifts and arithmetic
4834 overflow will [generate a warning instead of an error][1.5ce],
4835 delaying the error until runtime. This will allow the
4836 const-evaluator to be expanded in the future backwards-compatibly.
4837 * The `improper_ctypes` lint [no longer warns about using `isize` and
4838 `usize` in FFI][1.5ict].
4843 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4845 * `Default` is [implemented for mutable slices][1.5d].
4846 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4847 * There are now `From` conversions [between floating point
4848 types][1.5f] where the conversions are lossless.
4849 * There are now `From` conversions [between integer types][1.5i] where
4850 the conversions are lossless.
4851 * [`fs::Metadata` implements `Clone`][1.5fs].
4852 * The `parse` method [accepts a leading "+" when parsing
4854 * [`AsMut` is implemented for `Vec`][1.5am].
4855 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4856 been optimized][1.5cf] and no longer rely on the default impl.
4857 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4858 `unsafe extern "C"` function types now [implement `Clone`,
4859 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4860 `fmt::Debug` for up to 12 arguments][1.5fp].
4861 * [Dropping `Vec`s is much faster in unoptimized builds when the
4862 element types don't implement `Drop`][1.5dv].
4863 * A bug that caused in incorrect behavior when [combining `VecDeque`
4864 with zero-sized types][1.5vdz] was resolved.
4865 * [`PartialOrd` for slices is faster][1.5po].
4870 * [Crate metadata size was reduced by 20%][1.5md].
4871 * [Improvements to code generation reduced the size of libcore by 3.3
4872 MB and rustc's memory usage by 18MB][1.5m].
4873 * [Improvements to deref translation increased performance in
4874 unoptimized builds][1.5dr].
4875 * Various errors in trait resolution [are deduplicated to only be
4876 reported once][1.5te].
4877 * Rust has preliminary [support for rumprun kernels][1.5rr].
4878 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4880 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4881 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4882 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4883 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4884 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4885 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4886 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4887 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4888 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4889 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4890 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4891 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4892 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4893 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4894 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4895 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4896 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4897 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4898 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4899 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4900 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4901 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4902 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4903 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4904 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4905 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4906 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4907 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4908 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4909 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4910 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4911 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4912 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4913 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4914 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4915 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4916 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4917 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4918 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4919 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4920 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4921 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4922 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4923 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4924 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4925 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4926 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4927 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4928 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4929 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4930 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4931 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4932 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4933 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4934 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4935 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4936 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4937 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4938 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4939 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4940 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4941 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4942 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4943 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4944 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4945 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4946 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4947 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4948 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4949 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4950 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4951 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4952 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4953 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4954 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4955 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4956 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4957 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4958 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4959 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4960 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4961 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4962 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4963 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4964 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4965 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4966 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4967 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4968 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4970 Version 1.4.0 (2015-10-29)
4971 ==========================
4973 * ~1200 changes, numerous bugfixes
4978 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
4979 GNU) are now supported and recommended for use.
4984 * [Several changes have been made to fix type soundness and improve
4985 the behavior of associated types][sound]. See [RFC 1214]. Although
4986 we have mostly introduced these changes as warnings this release, to
4987 become errors next release, there are still some scenarios that will
4988 see immediate breakage.
4989 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
4990 line breaks in addition to `\n`][crlf].
4991 * [Loans of `'static` lifetime extend to the end of a function][stat].
4992 * [`str::parse` no longer introduces avoidable rounding error when
4993 parsing floating point numbers. Together with earlier changes to
4994 float formatting/output, "round trips" like f.to_string().parse()
4995 now preserve the value of f exactly. Additionally, leading plus
4996 signs are now accepted][fp3].
5002 * `use` statements that import multiple items [can now rename
5003 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
5004 * [Binops work correctly on fat pointers][binfat].
5005 * `pub extern crate`, which does not behave as expected, [issues a
5006 warning][pec] until a better solution is found.
5011 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5012 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5013 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5014 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5015 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5016 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5017 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5018 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5019 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5020 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5021 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5022 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5023 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5024 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5025 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5026 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5027 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5028 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5030 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5031 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5032 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5033 `f64::from_str_radix`.
5034 * [Reverse-searching strings is faster with the 'two-way'
5036 * [`std::io::copy` allows `?Sized` arguments][cc].
5037 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5038 [override `count`, `nth` and `last` with an O(1)
5039 implementation][it].
5040 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5041 * [`IntoRawFd` has been added to the Unix-specific prelude,
5042 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5044 * [`Extend<String>` and `FromIterator<String` are both implemented for
5046 * [`IntoIterator` is implemented for references to `Option` and
5048 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5049 Copy`][ext] as part of [RFC 839]. This will cause type inference
5050 breakage in rare situations.
5051 * [`BinaryHeap` implements `Debug`][bh2].
5052 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5054 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5055 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5056 * [String comparison is faster][faststr].
5057 * `&mut T` where `T: std::fmt::Write` [also implements
5058 `std::fmt::Write`][mutw].
5059 * [A stable regression in `VecDeque::push_back` and other
5060 capacity-altering methods that caused panics for zero-sized types
5062 * [Function pointers implement traits for up to 12 parameters][fp2].
5067 * The compiler [no longer uses the 'morestack' feature to prevent
5068 stack overflow][mm]. Instead it uses guard pages and stack
5069 probes (though stack probes are not yet implemented on any platform
5071 * [The compiler matches traits faster when projections are involved][p].
5072 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5074 * [Cargo now displays useful information about what its doing during
5075 `cargo update`][cu].
5077 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5078 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5079 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5080 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5081 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5082 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5083 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5084 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5085 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5086 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5087 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5088 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5089 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5090 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5091 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5092 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5093 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5094 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5095 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5096 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5097 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5098 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5099 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5100 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5101 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5102 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5103 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
5104 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
5105 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
5106 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
5107 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
5108 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
5109 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
5110 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
5111 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
5112 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
5113 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
5114 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
5115 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
5116 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
5117 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
5118 [bh2]: https://github.com/rust-lang/rust/pull/28156
5119 [binfat]: https://github.com/rust-lang/rust/pull/28270
5120 [bm]: https://github.com/rust-lang/rust/pull/28197
5121 [cc]: https://github.com/rust-lang/rust/pull/27531
5122 [crlf]: https://github.com/rust-lang/rust/pull/28034
5123 [cu]: https://github.com/rust-lang/cargo/pull/1931
5124 [d]: https://github.com/rust-lang/rust/pull/27825
5125 [dep]: https://github.com/rust-lang/rust/pull/28339
5126 [es]: https://github.com/rust-lang/rust/pull/27956
5127 [ext]: https://github.com/rust-lang/rust/pull/28094
5128 [faststr]: https://github.com/rust-lang/rust/pull/28338
5129 [ffi]: https://github.com/rust-lang/rust/pull/28779
5130 [fp]: https://github.com/rust-lang/rust/pull/28268
5131 [fp2]: https://github.com/rust-lang/rust/pull/28560
5132 [fp3]: https://github.com/rust-lang/rust/pull/27307
5133 [i]: https://github.com/rust-lang/rust/pull/27451
5134 [into2]: https://github.com/rust-lang/rust/pull/28039
5135 [it]: https://github.com/rust-lang/rust/pull/27652
5136 [mm]: https://github.com/rust-lang/rust/pull/27338
5137 [mutw]: https://github.com/rust-lang/rust/pull/28368
5138 [sound]: https://github.com/rust-lang/rust/pull/27641
5139 [p]: https://github.com/rust-lang/rust/pull/27866
5140 [pec]: https://github.com/rust-lang/rust/pull/28486
5141 [pr]: https://github.com/rust-lang/rust/pull/27896
5142 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5143 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5144 [s]: https://github.com/rust-lang/rust/pull/27474
5145 [stab]: https://github.com/rust-lang/rust/pull/28339
5146 [stat]: https://github.com/rust-lang/rust/pull/28321
5147 [vd]: https://github.com/rust-lang/rust/pull/28494
5149 Version 1.3.0 (2015-09-17)
5150 ==============================
5152 * ~900 changes, numerous bugfixes
5157 * The [new object lifetime defaults][nold] have been [turned
5158 on][nold2] after a cycle of warnings about the change. Now types
5159 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
5160 being interpreted as `&'a Box<Trait+'a>` to `&'a
5161 Box<Trait+'static>`.
5162 * [The Rustonomicon][nom] is a new book in the official documentation
5163 that dives into writing unsafe Rust.
5164 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
5165 timekeeping is employed by other std APIs, as well as out-of-tree
5171 * The [new object lifetime defaults][nold] have been [turned
5172 on][nold2] after a cycle of warnings about the change.
5173 * There is a known [regression][lr] in how object lifetime elision is
5174 interpreted, the proper solution for which is undetermined.
5175 * The `#[prelude_import]` attribute, an internal implementation
5176 detail, was accidentally stabilized previously. [It has been put
5177 behind the `prelude_import` feature gate][pi]. This change is
5178 believed to break no existing code.
5179 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5180 [more sane for dynamically sized types][dst3]. Code that relied on
5181 the previous behavior is thought to be broken.
5182 * The `dropck` rules, which checks that destructors can't access
5183 destroyed values, [have been updated][dropck] to match the
5184 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
5185 cause some previously-compiling code to no longer build.
5190 * The [new object lifetime defaults][nold] have been [turned
5191 on][nold2] after a cycle of warnings about the change.
5192 * Semicolons may [now follow types and paths in
5193 macros](https://github.com/rust-lang/rust/pull/27000).
5194 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5195 [more sane for dynamically sized types][dst3]. Code that relied on
5196 the previous behavior is not known to exist, and suspected to be
5198 * `'static` variables [may now be recursive][st].
5199 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
5200 implementations correctly.
5201 * The `dropck` rules, which checks that destructors can't access
5202 destroyed values, [have been updated][dropck] to match the
5208 * The [`Duration`] API, [has been stabilized][ds], as well as the
5209 `std::time` module, which presently contains only `Duration`.
5210 * `Box<str>` and `Box<[T]>` both implement `Clone`.
5211 * The owned C string, [`CString`], implements [`Borrow`] and the
5212 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
5213 these allow C strings to be borrowed and cloned in generic code.
5214 * [`CStr`] implements [`Debug`].
5215 * [`AtomicPtr`] implements [`Debug`].
5216 * [`Error`] trait objects [can be downcast to their concrete types][e]
5217 in many common configurations, using the [`is`], [`downcast`],
5218 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
5220 * Searching for substrings now [employs the two-way algorithm][search]
5221 instead of doing a naive search. This gives major speedups to a
5222 number of methods, including [`contains`][sc], [`find`][sf],
5223 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
5224 [`ends_with`][sew] are also faster.
5225 * The performance of `PartialEq` for slices is [much faster][ps].
5226 * The [`Hash`] trait offers the default method, [`hash_slice`], which
5227 is overridden and optimized by the implementations for scalars.
5228 * The [`Hasher`] trait now has a number of specialized `write_*`
5229 methods for primitive types, for efficiency.
5230 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
5231 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
5232 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
5233 of [`std::error::Error::cause`][iec] also delegates to the inner
5235 * [`process::Child`][pc] gained the [`id`] method, which returns a
5236 `u32` representing the platform-specific process identifier.
5237 * The [`connect`] method on slices is deprecated, replaced by the new
5238 [`join`] method (note that both of these are on the *unstable*
5239 [`SliceConcatExt`] trait, but through the magic of the prelude are
5240 available to stable code anyway).
5241 * The [`Div`] operator is implemented for [`Wrapping`] types.
5242 * [`DerefMut` is implemented for `String`][dms].
5243 * Performance of SipHash (the default hasher for `HashMap`) is
5244 [better for long data][sh].
5245 * [`AtomicPtr`] implements [`Send`].
5246 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
5247 are now [specialized to use uninitialized buffers for increased
5249 * Lifetime parameters of foreign functions [are now resolved
5255 * Rust can now, with some coercion, [produce programs that run on
5256 Windows XP][xp], though XP is not considered a supported platform.
5257 * Porting Rust on Windows from the GNU toolchain to MSVC continues
5258 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
5259 recommended for use in 1.3, though should be fully-functional
5260 in the [64-bit 1.4 beta][b14].
5261 * On Fedora-based systems installation will [properly configure the
5262 dynamic linker][fl].
5263 * The compiler gained many new extended error descriptions, which can
5264 be accessed with the `--explain` flag.
5265 * The `dropck` pass, which checks that destructors can't access
5266 destroyed values, [has been rewritten][dropck]. This fixes some
5267 soundness holes, and as such will cause some previously-compiling
5268 code to no longer build.
5269 * `rustc` now uses [LLVM to write archive files where possible][ar].
5270 Eventually this will eliminate the compiler's dependency on the ar
5272 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
5273 supported FreeBSD on x86_64).
5274 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
5275 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
5277 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
5278 will kill the process instead of leaking][nlp].
5280 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
5281 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
5282 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
5283 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
5284 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
5285 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5286 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5287 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
5288 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
5289 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
5290 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
5291 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
5292 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
5293 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5294 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
5295 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
5296 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
5297 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
5298 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5299 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
5300 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
5301 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
5302 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
5303 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5304 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
5305 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
5306 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
5307 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
5308 [ar]: https://github.com/rust-lang/rust/pull/26926
5309 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
5310 [dms]: https://github.com/rust-lang/rust/pull/26241
5311 [dropck]: https://github.com/rust-lang/rust/pull/27261
5312 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5313 [ds]: https://github.com/rust-lang/rust/pull/26818
5314 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
5315 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
5316 [dst3]: https://github.com/rust-lang/rust/pull/27351
5317 [e]: https://github.com/rust-lang/rust/pull/24793
5318 [f]: https://github.com/rust-lang/rust/pull/26588
5319 [fb]: https://github.com/rust-lang/rust/pull/26959
5320 [fl]: https://github.com/rust-lang/rust-installer/pull/41
5321 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5322 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
5323 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
5324 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
5325 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
5326 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
5327 [lic]: https://github.com/rust-lang/rust/pull/26583
5328 [lnu]: https://github.com/rust-lang/rust/pull/27026
5329 [lr]: https://github.com/rust-lang/rust/issues/27248
5330 [lum]: https://github.com/rust-lang/rust/pull/26378
5331 [lur]: https://github.com/rust-lang/rust/pull/26783
5332 [nlp]: https://github.com/rust-lang/rust/pull/27176
5333 [nold2]: https://github.com/rust-lang/rust/pull/27045
5334 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
5335 [nom]: http://doc.rust-lang.org/nightly/nomicon/
5336 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
5337 [pi]: https://github.com/rust-lang/rust/pull/26699
5338 [ps]: https://github.com/rust-lang/rust/pull/26884
5339 [rte]: https://github.com/rust-lang/rust/pull/26950
5340 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
5341 [search]: https://github.com/rust-lang/rust/pull/26327
5342 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
5343 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
5344 [sh]: https://github.com/rust-lang/rust/pull/27280
5345 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
5346 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
5347 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
5348 [st]: https://github.com/rust-lang/rust/pull/26630
5349 [win1]: https://github.com/rust-lang/rust/pull/26569
5350 [win2]: https://github.com/rust-lang/rust/pull/26741
5351 [win3]: https://github.com/rust-lang/rust/pull/26741
5352 [win4]: https://github.com/rust-lang/rust/pull/27210
5353 [xp]: https://github.com/rust-lang/rust/pull/26569
5355 Version 1.2.0 (2015-08-07)
5356 ==========================
5358 * ~1200 changes, numerous bugfixes
5363 * [Dynamically-sized-type coercions][dst] allow smart pointer types
5364 like `Rc` to contain types without a fixed size, arrays and trait
5365 objects, finally enabling use of `Rc<[T]>` and completing the
5366 implementation of DST.
5367 * [Parallel codegen][parcodegen] is now working again, which can
5368 substantially speed up large builds in debug mode; It also gets
5369 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5370 jobs). It's not enabled by default, but will be "in the near
5371 future". It can be activated with the `-C codegen-units=N` flag to
5373 * This is the first release with [experimental support for linking
5374 with the MSVC linker and lib C on Windows (instead of using the GNU
5375 variants via MinGW)][win]. It is yet recommended only for the most
5376 intrepid Rustaceans.
5377 * Benchmark compilations are showing a 30% improvement in
5378 bootstrapping over 1.1.
5383 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5384 unicode case mapping, which is a previously-planned change in
5385 behavior and considered a bugfix.
5386 * [`mem::align_of`] now specifies [the *minimum alignment* for
5387 T][align], which is usually the alignment programs are interested
5388 in, and the same value reported by clang's
5389 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5391 * [The `#[packed]` attribute is no longer silently accepted by the
5392 compiler][packed]. This attribute did nothing and code that
5393 mentioned it likely did not work as intended.
5394 * Associated type defaults are [now behind the
5395 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5396 defaults *did not work*, but could be mentioned syntactically. As
5397 such this breakage has minimal impact.
5402 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5403 matching against dereferenceable values.
5408 * The [`Extend`] trait, which grows a collection from an iterator, is
5409 implemented over iterators of references, for `String`, `Vec`,
5410 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5411 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5412 * The [`iter::once`] function returns an iterator that yields a single
5413 element, and [`iter::empty`] returns an iterator that yields no
5415 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5416 over substring matches.
5417 * [`Cell`] and [`RefCell`] both implement `Eq`.
5418 * A number of methods for wrapping arithmetic are added to the
5419 integral types, [`wrapping_div`], [`wrapping_rem`],
5420 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5421 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5422 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5423 type.. It is illegal for the default arithmetic operations in Rust
5424 to overflow; the desire to wrap must be explicit.
5425 * The `{:#?}` formatting specifier [displays the alternate,
5426 pretty-printed][debugfmt] form of the `Debug` formatter. This
5427 feature was actually introduced prior to 1.0 with little
5429 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5430 for writing data to formatted strings, similar to [`io::Write`].
5431 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5432 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5433 are used by code generators to emit implementations of [`Debug`].
5434 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5435 methods that convert case, following Unicode case mapping.
5436 * It is now easier to handle poisoned locks. The [`PoisonError`]
5437 type, returned by failing lock operations, exposes `into_inner`,
5438 `get_ref`, and `get_mut`, which all give access to the inner lock
5439 guard, and allow the poisoned lock to continue to operate. The
5440 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5441 poisoned lock without attempting to take the lock.
5442 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5443 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5444 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5445 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5447 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5453 * `rustc` employs smarter heuristics for guessing at [typos].
5454 * `rustc` emits more efficient code for [no-op conversions between
5455 unsafe pointers][nop].
5456 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5457 resulting in faster compile times and smaller code.
5459 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5460 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5461 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5462 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5463 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5464 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5465 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5466 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5467 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5468 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5469 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5470 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5471 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5472 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5473 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5474 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5475 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5476 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5477 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5478 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5479 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5480 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5481 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5482 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5483 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5484 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5485 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5486 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5487 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5488 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5489 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5490 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5491 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5492 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5493 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5494 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5495 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5496 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5497 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5498 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5499 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5500 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5501 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5502 [align]: https://github.com/rust-lang/rust/pull/25646
5503 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5504 [typos]: https://github.com/rust-lang/rust/pull/26087
5505 [nop]: https://github.com/rust-lang/rust/pull/26336
5506 [fat]: https://github.com/rust-lang/rust/pull/26411
5507 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5508 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5509 [packed]: https://github.com/rust-lang/rust/pull/25541
5510 [ad]: https://github.com/rust-lang/rust/pull/27382
5511 [win]: https://github.com/rust-lang/rust/pull/25350
5513 Version 1.1.0 (2015-06-25)
5514 =========================
5516 * ~850 changes, numerous bugfixes
5521 * The [`std::fs` module has been expanded][fs] to expand the set of
5522 functionality exposed:
5523 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5524 don't incur a syscall on some platforms.
5525 * A `symlink_metadata` function has been added.
5526 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5527 access to all underlying information.
5528 * The compiler now contains extended explanations of many errors. When an error
5529 with an explanation occurs the compiler suggests using the `--explain` flag
5530 to read the explanation. Error explanations are also [available online][err-index].
5531 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5532 well as other work, the time to bootstrap the compiler decreased by
5538 * The [`str::split_whitespace`] method splits a string on unicode
5539 whitespace boundaries.
5540 * On both Windows and Unix, new extension traits provide conversion of
5541 I/O types to and from the underlying system handles. On Unix, these
5542 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5543 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5544 `TcpListener`, and `UpdSocket`. Further implementations for
5545 `std::process` will be stabilized later.
5546 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5547 Windows, symlinks can be created with
5548 `std::os::windows::symlink_dir` and
5549 `std::os::windows::symlink_file`.
5550 * The `mpsc::Receiver` type can now be converted into an iterator with
5551 `into_iter` on the [`IntoIterator`] trait.
5552 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5553 implementation of the [`From`] trait.
5554 * The `Debug` implementation for `RangeFull` [creates output that is
5555 more consistent with other implementations][rf].
5556 * [`Debug` is implemented for `File`][file].
5557 * The `Default` implementation for `Arc` [no longer requires `Sync +
5559 * [The `Iterator` methods `count`, `nth`, and `last` have been
5560 overridden for slices to have O(1) performance instead of O(n)][si].
5561 * Incorrect handling of paths on Windows has been improved in both the
5562 compiler and the standard library.
5563 * [`AtomicPtr` gained a `Default` implementation][ap].
5564 * In accordance with Rust's policy on arithmetic overflow `abs` now
5565 [panics on overflow when debug assertions are enabled][abs].
5566 * The [`Cloned`] iterator, which was accidentally left unstable for
5567 1.0 [has been stabilized][c].
5568 * The [`Incoming`] iterator, which iterates over incoming TCP
5569 connections, and which was accidentally unnamable in 1.0, [is now
5570 properly exported][inc].
5571 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5572 `sift_up` or `sift_down` panic][bh].
5573 * The [`split_off`] method of `LinkedList` [no longer corrupts
5574 the list in certain scenarios][ll].
5579 * Type checking performance [has improved notably][sk] with
5580 [multiple improvements][pre].
5581 * The compiler [suggests code changes][ch] for more errors.
5582 * rustc and it's build system have experimental support for [building
5583 toolchains against MUSL][m] instead of glibc on Linux.
5584 * The compiler defines the `target_env` cfg value, which is used for
5585 distinguishing toolchains that are otherwise for the same
5586 platform. Presently this is set to `gnu` for common GNU Linux
5587 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5588 * The [`cargo rustc`][crc] command invokes a build with custom flags
5590 * [Android executables are always position independent][pie].
5591 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5594 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5595 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5596 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5597 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5598 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5599 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5600 [rf]: https://github.com/rust-lang/rust/pull/24491
5601 [err-index]: https://doc.rust-lang.org/error-index.html
5602 [sk]: https://github.com/rust-lang/rust/pull/24615
5603 [pre]: https://github.com/rust-lang/rust/pull/25323
5604 [file]: https://github.com/rust-lang/rust/pull/24598
5605 [ch]: https://github.com/rust-lang/rust/pull/24683
5606 [arc]: https://github.com/rust-lang/rust/pull/24695
5607 [si]: https://github.com/rust-lang/rust/pull/24701
5608 [ap]: https://github.com/rust-lang/rust/pull/24834
5609 [m]: https://github.com/rust-lang/rust/pull/24777
5610 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5611 [crc]: https://github.com/rust-lang/cargo/pull/1568
5612 [pie]: https://github.com/rust-lang/rust/pull/24953
5613 [abs]: https://github.com/rust-lang/rust/pull/25441
5614 [c]: https://github.com/rust-lang/rust/pull/25496
5615 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5616 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5617 [inc]: https://github.com/rust-lang/rust/pull/25522
5618 [bh]: https://github.com/rust-lang/rust/pull/25856
5619 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5620 [ll]: https://github.com/rust-lang/rust/pull/26022
5621 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5622 [drop]: https://github.com/rust-lang/rust/pull/24935
5624 Version 1.0.0 (2015-05-15)
5625 ========================
5627 * ~1500 changes, numerous bugfixes
5632 * The vast majority of the standard library is now `#[stable]`. It is
5633 no longer possible to use unstable features with a stable build of
5635 * Many popular crates on [crates.io] now work on the stable release
5637 * Arithmetic on basic integer types now [checks for overflow in debug
5643 * Several [restrictions have been added to trait coherence][coh] in
5644 order to make it easier for upstream authors to change traits
5645 without breaking downstream code.
5646 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5647 improve error messages and macro behavior. For example, `0b1234` is
5648 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5649 * Trait bounds [are always invariant][inv], eliminating the need for
5650 the `PhantomFn` and `MarkerTrait` lang items, which have been
5652 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5653 "foo" as bar` syntax has been replaced with `extern crate foo as
5654 bar`, and Cargo now automatically translates "-" in *package* names
5655 to underscore for the crate name.
5656 * [Lifetime shadowing is an error][lt].
5657 * [`Send` no longer implies `'static`][send-rfc].
5658 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5659 `MyType::default()`.
5660 * Primitive types [now have inherent methods][prim-inherent],
5661 obviating the need for extension traits like `SliceExt`.
5662 * Methods with `Self: Sized` in their `where` clause are [considered
5663 object-safe][self-sized], allowing many extension traits like
5664 `IteratorExt` to be merged into the traits they extended.
5665 * You can now [refer to associated types][assoc-where] whose
5666 corresponding trait bounds appear only in a `where` clause.
5667 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5668 like `Send` and `Sync` are now library-defined.
5669 * A [Reflect trait][reflect] was introduced, which means that
5670 downcasting via the `Any` trait is effectively limited to concrete
5671 types. This helps retain the potentially-important "parametricity"
5672 property: generic code cannot behave differently for different type
5673 arguments except in minor ways.
5674 * The `unsafe_destructor` feature is now deprecated in favor of the
5675 [new `dropck`][dropck]. This change is a major reduction in unsafe
5681 * The `thread_local` module [has been renamed to `std::thread`][th].
5682 * The methods of `IteratorExt` [have been moved to the `Iterator`
5684 * Several traits that implement Rust's conventions for type
5685 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5686 [centralized in the `std::convert` module][con].
5687 * The `FromError` trait [was removed in favor of `From`][fe].
5688 * The basic sleep function [has moved to
5689 `std::thread::sleep_ms`][slp].
5690 * The `splitn` function now takes an `n` parameter that represents the
5691 number of items yielded by the returned iterator [instead of the
5692 number of 'splits'][spl].
5693 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5694 * [Derived implementations of `PartialOrd` now order enums according
5695 to their explicitly-assigned discriminants][po].
5696 * [Methods for searching strings are generic over `Pattern`s][pat],
5697 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5699 * [In method resolution, object methods are resolved before inherent
5701 * [`String::from_str` has been deprecated in favor of the `From` impl,
5702 `String::from`][sf].
5703 * [`io::Error` implements `Sync`][ios].
5704 * [The `words` method on `&str` has been replaced with
5705 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5707 * The new path and IO modules are complete and `#[stable]`. This
5708 was the major library focus for this cycle.
5709 * The path API was [revised][path-normalize] to normalize `.`,
5710 adjusting the tradeoffs in favor of the most common usage.
5711 * A large number of remaining APIs in `std` were also stabilized
5712 during this cycle; about 75% of the non-deprecated API surface
5714 * The new [string pattern API][string-pattern] landed, which makes
5715 the string slice API much more internally consistent and flexible.
5716 * A new set of [generic conversion traits][conversion] replaced
5717 many existing ad hoc traits.
5718 * Generic numeric traits were [completely removed][num-traits]. This
5719 was made possible thanks to inherent methods for primitive types,
5720 and the removal gives maximal flexibility for designing a numeric
5721 hierarchy in the future.
5722 * The `Fn` traits are now related via [inheritance][fn-inherit]
5723 and provide ergonomic [blanket implementations][fn-blanket].
5724 * The `Index` and `IndexMut` traits were changed to
5725 [take the index by value][index-value], enabling code like
5726 `hash_map["string"]` to work.
5727 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5728 `Copy` data is known to be `Clone` as well.
5733 * Many errors now have extended explanations that can be accessed with
5734 the `--explain` flag to `rustc`.
5735 * Many new examples have been added to the standard library
5737 * rustdoc has received a number of improvements focused on completion
5739 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5740 * Much headway was made on ecosystem-wide CI, making it possible
5741 to [compare builds for breakage][ci-compare].
5744 [crates.io]: http://crates.io
5745 [clo]: https://github.com/rust-lang/rust/pull/24034
5746 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5747 [con]: https://github.com/rust-lang/rust/pull/23875
5748 [cr]: https://github.com/rust-lang/rust/pull/23419
5749 [fe]: https://github.com/rust-lang/rust/pull/23879
5750 [ie]: https://github.com/rust-lang/rust/pull/23300
5751 [inv]: https://github.com/rust-lang/rust/pull/23938
5752 [ios]: https://github.com/rust-lang/rust/pull/24133
5753 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5754 [lt]: https://github.com/rust-lang/rust/pull/24057
5755 [meth]: https://github.com/rust-lang/rust/pull/24056
5756 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5757 [po]: https://github.com/rust-lang/rust/pull/24270
5758 [sf]: https://github.com/rust-lang/rust/pull/24517
5759 [slp]: https://github.com/rust-lang/rust/pull/23949
5760 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5761 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5762 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5763 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5764 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5765 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5766 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5767 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5768 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5769 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5770 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5771 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5772 [reflect]: https://github.com/rust-lang/rust/pull/23712
5773 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5774 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5775 [index-value]: https://github.com/rust-lang/rust/pull/23601
5776 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5777 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5778 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5779 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5780 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5781 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5784 Version 1.0.0-alpha.2 (2015-02-20)
5785 =====================================
5787 * ~1300 changes, numerous bugfixes
5791 * The various I/O modules were [overhauled][io-rfc] to reduce
5792 unnecessary abstractions and provide better interoperation with
5793 the underlying platform. The old `io` module remains temporarily
5795 * The standard library now [participates in feature gating][feat],
5796 so use of unstable libraries now requires a `#![feature(...)]`
5797 attribute. The impact of this change is [described on the
5798 forum][feat-forum]. [RFC][feat-rfc].
5802 * `for` loops [now operate on the `IntoIterator` trait][into],
5803 which eliminates the need to call `.iter()`, etc. to iterate
5804 over collections. There are some new subtleties to remember
5805 though regarding what sort of iterators various types yield, in
5806 particular that `for foo in bar { }` yields values from a move
5807 iterator, destroying the original collection. [RFC][into-rfc].
5808 * Objects now have [default lifetime bounds][obj], so you don't
5809 have to write `Box<Trait+'static>` when you don't care about
5810 storing references. [RFC][obj-rfc].
5811 * In types that implement `Drop`, [lifetimes must outlive the
5812 value][drop]. This will soon make it possible to safely
5813 implement `Drop` for types where `#[unsafe_destructor]` is now
5814 required. Read the [gorgeous RFC][drop-rfc] for details.
5815 * The fully qualified <T as Trait>::X syntax lets you set the Self
5816 type for a trait method or associated type. [RFC][ufcs-rfc].
5817 * References to types that implement `Deref<U>` now [automatically
5818 coerce to references][deref] to the dereferenced type `U`,
5819 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5820 should eliminate many unsightly uses of `&*`, as when converting
5821 from references to vectors into references to
5822 slices. [RFC][deref-rfc].
5823 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5824 `|:|`) is obsolete and closure kind is inferred from context.
5825 * [`Self` is a keyword][Self].
5829 * The `Show` and `String` formatting traits [have been
5830 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5831 their related purposes. Automatically getting a string
5832 conversion to use with `format!("{:?}", something_to_debug)` is
5833 now written `#[derive(Debug)]`.
5834 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5835 OsStr}`, provide strings in platform-specific encodings for easier
5836 interop with system APIs. [RFC][osstr-rfc].
5837 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5838 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5839 creating raw pointers.
5843 * Certain long error messages of the form 'expected foo found bar'
5844 are now [split neatly across multiple
5845 lines][multiline]. Examples in the PR.
5846 * On Unix Rust can be [uninstalled][un] by running
5847 `/usr/local/lib/rustlib/uninstall.sh`.
5848 * The `#[rustc_on_unimplemented]` attribute, requiring the
5849 'on_unimplemented' feature, lets rustc [display custom error
5850 messages when a trait is expected to be implemented for a type
5855 * Rust is tested against a [LALR grammar][lalr], which parses
5856 almost all the Rust files that rustc does.
5858 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5859 [close]: https://github.com/rust-lang/rust/pull/21843
5860 [deref]: https://github.com/rust-lang/rust/pull/21351
5861 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5862 [drop]: https://github.com/rust-lang/rust/pull/21972
5863 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5864 [feat]: https://github.com/rust-lang/rust/pull/21248
5865 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5866 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5867 [fmt]: https://github.com/rust-lang/rust/pull/21457
5868 [into]: https://github.com/rust-lang/rust/pull/20790
5869 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5870 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5871 [lalr]: https://github.com/rust-lang/rust/pull/21452
5872 [multiline]: https://github.com/rust-lang/rust/pull/19870
5873 [obj]: https://github.com/rust-lang/rust/pull/22230
5874 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5875 [onun]: https://github.com/rust-lang/rust/pull/20889
5876 [osstr]: https://github.com/rust-lang/rust/pull/21488
5877 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5878 [Self]: https://github.com/rust-lang/rust/pull/22158
5879 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5880 [un]: https://github.com/rust-lang/rust/pull/22256
5883 Version 1.0.0-alpha (2015-01-09)
5884 ==================================
5886 * ~2400 changes, numerous bugfixes
5890 * The language itself is considered feature complete for 1.0,
5891 though there will be many usability improvements and bugfixes
5892 before the final release.
5893 * Nearly 50% of the public API surface of the standard library has
5894 been declared 'stable'. Those interfaces are unlikely to change
5896 * The long-running debate over integer types has been
5897 [settled][ints]: Rust will ship with types named `isize` and
5898 `usize`, rather than `int` and `uint`, for pointer-sized
5899 integers. Guidelines will be rolled out during the alpha cycle.
5900 * Most crates that are not `std` have been moved out of the Rust
5901 distribution into the Cargo ecosystem so they can evolve
5902 separately and don't need to be stabilized as quickly, including
5903 'time', 'getopts', 'num', 'regex', and 'term'.
5904 * Documentation continues to be expanded with more API coverage, more
5905 examples, and more in-depth explanations. The guides have been
5906 consolidated into [The Rust Programming Language][trpl].
5907 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5908 * All official Rust binary installers now come with [Cargo], the
5909 Rust package manager.
5913 * Closures have been [completely redesigned][unboxed] to be
5914 implemented in terms of traits, can now be used as generic type
5915 bounds and thus monomorphized and inlined, or via an opaque
5916 pointer (boxed) as in the old system. The new system is often
5917 referred to as 'unboxed' closures.
5918 * Traits now support [associated types][assoc], allowing families
5919 of related types to be defined together and used generically in
5921 * Enum variants are [namespaced by their type names][enum].
5922 * [`where` clauses][where] provide a more versatile and attractive
5923 syntax for specifying generic bounds, though the previous syntax
5925 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5927 * Rust [no longer has a runtime][rt] of any description, and only
5928 supports OS threads, not green threads.
5929 * At long last, Rust has been overhauled for 'dynamically-sized
5930 types' ([DST]), which integrates 'fat pointers' (object types,
5931 arrays, and `str`) more deeply into the type system, making it
5933 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5934 `..j` that produce range types and which, when combined with the
5935 `Index` operator and multidispatch, leads to a convenient slice
5937 * The new range syntax revealed an ambiguity in the fixed-length
5938 array syntax, so now fixed length arrays [are written `[T;
5940 * The `Copy` trait is no longer implemented automatically. Unsafe
5941 pointers no longer implement `Sync` and `Send` so types
5942 containing them don't automatically either. `Sync` and `Send`
5943 are now 'unsafe traits' so one can "forcibly" implement them via
5944 `unsafe impl` if a type confirms to the requirements for them
5945 even though the internals do not (e.g. structs containing unsafe
5946 pointers like `Arc`). These changes are intended to prevent some
5947 footguns and are collectively known as [opt-in built-in
5948 traits][oibit] (though `Sync` and `Send` will soon become pure
5949 library types unknown to the compiler).
5950 * Operator traits now take their operands [by value][ops], and
5951 comparison traits can use multidispatch to compare one type
5952 against multiple other types, allowing e.g. `String` to be
5953 compared with `&str`.
5954 * `if let` and `while let` are no longer feature-gated.
5955 * Rust has adopted a more [uniform syntax for escaping unicode
5956 characters][unicode].
5957 * `macro_rules!` [has been declared stable][mac]. Though it is a
5958 flawed system it is sufficiently popular that it must be usable
5959 for 1.0. Effort has gone into [future-proofing][mac-future] it
5960 in ways that will allow other macro systems to be developed in
5961 parallel, and won't otherwise impact the evolution of the
5963 * The prelude has been [pared back significantly][prelude] such
5964 that it is the minimum necessary to support the most pervasive
5965 code patterns, and through [generalized where clauses][where]
5966 many of the prelude extension traits have been consolidated.
5967 * Rust's rudimentary reflection [has been removed][refl], as it
5968 incurred too much code generation for little benefit.
5969 * [Struct variants][structvars] are no longer feature-gated.
5970 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5971 known as 'higher-ranked trait bounds', this crucially allows
5972 unboxed closures to work.
5973 * Macros invocations surrounded by parens or square brackets and
5974 not terminated by a semicolon are [parsed as
5975 expressions][macros], which makes expressions like `vec![1i32,
5976 2, 3].len()` work as expected.
5977 * Trait objects now implement their traits automatically, and
5978 traits that can be coerced to objects now must be [object
5980 * Automatically deriving traits is now done with `#[derive(...)]`
5981 not `#[deriving(...)]` for [consistency with other naming
5982 conventions][derive].
5983 * Importing the containing module or enum at the same time as
5984 items or variants they contain is [now done with `self` instead
5985 of `mod`][self], as in use `foo::{self, bar}`
5986 * Glob imports are no longer feature-gated.
5987 * The `box` operator and `box` patterns have been feature-gated
5988 pending a redesign. For now unique boxes should be allocated
5989 like other containers, with `Box::new`.
5993 * A [series][coll1] of [efforts][coll2] to establish
5994 [conventions][coll3] for collections types has resulted in API
5995 improvements throughout the standard library.
5996 * New [APIs for error handling][err] provide ergonomic interop
5997 between error types, and [new conventions][err-conv] describe
5998 more clearly the recommended error handling strategies in Rust.
5999 * The `fail!` macro has been renamed to [`panic!`][panic] so that
6000 it is easier to discuss failure in the context of error handling
6001 without making clarifications as to whether you are referring to
6002 the 'fail' macro or failure more generally.
6003 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
6004 syscall when available.
6005 * The 'serialize' crate has been renamed 'rustc-serialize' and
6006 moved out of the distribution to Cargo. Although it is widely
6007 used now, it is expected to be superseded in the near future.
6008 * The `Show` formatter, typically implemented with
6009 `#[derive(Show)]` is [now requested with the `{:?}`
6010 specifier][show] and is intended for use by all types, for uses
6011 such as `println!` debugging. The new `String` formatter must be
6012 implemented by hand, uses the `{}` specifier, and is intended
6013 for full-fidelity conversions of things that can logically be
6014 represented as strings.
6018 * [Flexible target specification][flex] allows rustc's code
6019 generation to be configured to support otherwise-unsupported
6021 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6022 respective debuggers with Rust-appropriate pretty-printing.
6023 * The Windows installation of Rust is distributed with the
6024 MinGW components currently required to link binaries on that
6029 * Nullable enum optimizations have been extended to more types so
6030 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6031 space than the inner types themselves.
6032 * Work has begun on supporting AArch64.
6034 [Cargo]: https://crates.io
6035 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6036 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6037 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6038 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6039 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6040 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6041 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6042 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6043 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6044 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6045 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6046 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6047 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6048 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6049 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6050 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6051 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6052 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6053 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6054 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6055 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6056 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6057 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6058 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6059 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6060 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6061 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6062 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6063 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6064 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6065 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6066 [trpl]: https://doc.rust-lang.org/book/index.html
6067 [rbe]: http://rustbyexample.com/
6070 Version 0.12.0 (2014-10-09)
6071 =============================
6073 * ~1900 changes, numerous bugfixes
6077 * The introductory documentation (now called The Rust Guide) has
6078 been completely rewritten, as have a number of supplementary
6080 * Rust's package manager, Cargo, continues to improve and is
6081 sometimes considered to be quite awesome.
6082 * Many API's in `std` have been reviewed and updated for
6083 consistency with the in-development Rust coding
6084 guidelines. The standard library documentation tracks
6085 stabilization progress.
6086 * Minor libraries have been moved out-of-tree to the rust-lang org
6087 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6088 be installed with Cargo.
6089 * Lifetime elision allows lifetime annotations to be left off of
6090 function declarations in many common scenarios.
6091 * Rust now works on 64-bit Windows.
6094 * Indexing can be overloaded with the `Index` and `IndexMut`
6096 * The `if let` construct takes a branch only if the `let` pattern
6097 matches, currently behind the 'if_let' feature gate.
6098 * 'where clauses', a more flexible syntax for specifying trait
6099 bounds that is more aesthetic, have been added for traits and
6100 free functions. Where clauses will in the future make it
6101 possible to constrain associated types, which would be
6102 impossible with the existing syntax.
6103 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
6104 the 'slicing_syntax' feature gate, and can be overloaded with
6105 the `Slice` or `SliceMut` traits.
6106 * The syntax for matching of sub-slices has been changed to use a
6107 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
6108 consistency with other uses of `..` and to future-proof
6109 potential additional uses of the syntax.
6110 * The syntax for matching inclusive ranges in patterns has changed
6111 from `0..3` to `0...4` to be consistent with the exclusive range
6113 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
6114 c]`) has been put behind the 'advanced_slice_patterns' feature
6115 gate and may be removed in the future.
6116 * Components of tuples and tuple structs can be extracted using
6117 the `value.0` syntax, currently behind the `tuple_indexing`
6119 * The `#[crate_id]` attribute is no longer supported; versioning
6120 is handled by the package manager.
6121 * Renaming crate imports are now written `extern crate foo as bar`
6122 instead of `extern crate bar = foo`.
6123 * Renaming use statements are now written `use foo as bar` instead
6125 * `let` and `match` bindings and argument names in macros are now
6127 * The new, more efficient, closure types ('unboxed closures') have
6128 been added under a feature gate, 'unboxed_closures'. These will
6129 soon replace the existing closure types, once higher-ranked
6130 trait lifetimes are added to the language.
6131 * `move` has been added as a keyword, for indicating closures
6132 that capture by value.
6133 * Mutation and assignment is no longer allowed in pattern guards.
6134 * Generic structs and enums can now have trait bounds.
6135 * The `Share` trait is now called `Sync` to free up the term
6136 'shared' to refer to 'shared reference' (the default reference
6138 * Dynamically-sized types have been mostly implemented,
6139 unifying the behavior of fat-pointer types with the rest of the
6141 * As part of dynamically-sized types, the `Sized` trait has been
6142 introduced, which qualifying types implement by default, and
6143 which type parameters expect by default. To specify that a type
6144 parameter does not need to be sized, write `<Sized? T>`. Most
6145 types are `Sized`, notable exceptions being unsized arrays
6146 (`[T]`) and trait types.
6147 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
6148 * Lifetime bounds can now be applied to type parameters and object
6150 * The old, reference counted GC type, `Gc<T>` which was once
6151 denoted by the `@` sigil, has finally been removed. GC will be
6152 revisited in the future.
6155 * Library documentation has been improved for a number of modules.
6156 * Bit-vectors, collections::bitv has been modernized.
6157 * The url crate is deprecated in favor of
6158 http://github.com/servo/rust-url, which can be installed with
6160 * Most I/O stream types can be cloned and subsequently closed from
6162 * A `std::time::Duration` type has been added for use in I/O
6163 methods that rely on timers, as well as in the 'time' crate's
6164 `Timespec` arithmetic.
6165 * The runtime I/O abstraction layer that enabled the green thread
6166 scheduler to do non-thread-blocking I/O has been removed, along
6167 with the libuv-based implementation employed by the green thread
6168 scheduler. This will greatly simplify the future I/O work.
6169 * `collections::btree` has been rewritten to have a more
6170 idiomatic and efficient design.
6173 * rustdoc output now indicates the stability levels of API's.
6174 * The `--crate-name` flag can specify the name of the crate
6175 being compiled, like `#[crate_name]`.
6176 * The `-C metadata` specifies additional metadata to hash into
6177 symbol names, and `-C extra-filename` specifies additional
6178 information to put into the output filename, for use by the
6179 package manager for versioning.
6180 * debug info generation has continued to improve and should be
6181 more reliable under both gdb and lldb.
6182 * rustc has experimental support for compiling in parallel
6183 using the `-C codegen-units` flag.
6184 * rustc no longer encodes rpath information into binaries by
6188 * Stack usage has been optimized with LLVM lifetime annotations.
6189 * Official Rust binaries on Linux are more compatible with older
6190 kernels and distributions, built on CentOS 5.10.
6193 Version 0.11.0 (2014-07-02)
6194 ==========================
6196 * ~1700 changes, numerous bugfixes
6199 * ~[T] has been removed from the language. This type is superseded by
6201 * ~str has been removed from the language. This type is superseded by
6203 * ~T has been removed from the language. This type is superseded by the
6205 * @T has been removed from the language. This type is superseded by the
6206 standard library's std::gc::Gc<T> type.
6207 * Struct fields are now all private by default.
6208 * Vector indices and shift amounts are both required to be a `uint`
6209 instead of any integral type.
6210 * Byte character, byte string, and raw byte string literals are now all
6211 supported by prefixing the normal literal with a `b`.
6212 * Multiple ABIs are no longer allowed in an ABI string
6213 * The syntax for lifetimes on closures/procedures has been tweaked
6214 slightly: `<'a>|A, B|: 'b + K -> T`
6215 * Floating point modulus has been removed from the language; however it
6216 is still provided by a library implementation.
6217 * Private enum variants are now disallowed.
6218 * The `priv` keyword has been removed from the language.
6219 * A closure can no longer be invoked through a &-pointer.
6220 * The `use foo, bar, baz;` syntax has been removed from the language.
6221 * The transmute intrinsic no longer works on type parameters.
6222 * Statics now allow blocks/items in their definition.
6223 * Trait bounds are separated from objects with + instead of : now.
6224 * Objects can no longer be read while they are mutably borrowed.
6225 * The address of a static is now marked as insignificant unless the
6226 #[inline(never)] attribute is placed it.
6227 * The #[unsafe_destructor] attribute is now behind a feature gate.
6228 * Struct literals are no longer allowed in ambiguous positions such as
6229 if, while, match, and for..in.
6230 * Declaration of lang items and intrinsics are now feature-gated by
6232 * Integral literals no longer default to `int`, and floating point
6233 literals no longer default to `f64`. Literals must be suffixed with an
6234 appropriate type if inference cannot determine the type of the
6236 * The Box<T> type is no longer implicitly borrowed to &mut T.
6237 * Procedures are now required to not capture borrowed references.
6240 * The standard library is now a "facade" over a number of underlying
6241 libraries. This means that development on the standard library should
6242 be speedier due to smaller crates, as well as a clearer line between
6244 * A new library, libcore, lives under the standard library's facade
6245 which is Rust's "0-assumption" library, suitable for embedded and
6246 kernel development for example.
6247 * A regex crate has been added to the standard distribution. This crate
6248 includes statically compiled regular expressions.
6249 * The unwrap/unwrap_err methods on Result require a Show bound for
6250 better error messages.
6251 * The return types of the std::comm primitives have been centralized
6252 around the Result type.
6253 * A number of I/O primitives have gained the ability to time out their
6255 * A number of I/O primitives have gained the ability to close their
6256 reading/writing halves to cancel pending operations.
6257 * Reverse iterator methods have been removed in favor of `rev()` on
6258 their forward-iteration counterparts.
6259 * A bitflags! macro has been added to enable easy interop with C and
6260 management of bit flags.
6261 * A debug_assert! macro is now provided which is disabled when
6262 `--cfg ndebug` is passed to the compiler.
6263 * A graphviz crate has been added for creating .dot files.
6264 * The std::cast module has been migrated into std::mem.
6265 * The std::local_data api has been migrated from freestanding functions
6266 to being based on methods.
6267 * The Pod trait has been renamed to Copy.
6268 * jemalloc has been added as the default allocator for types.
6269 * The API for allocating memory has been changed to use proper alignment
6270 and sized deallocation
6271 * Connecting a TcpStream or binding a TcpListener is now based on a
6272 string address and a u16 port. This allows connecting to a hostname as
6274 * The Reader trait now contains a core method, read_at_least(), which
6275 correctly handles many repeated 0-length reads.
6276 * The process-spawning API is now centered around a builder-style
6278 * The :? printing qualifier has been moved from the standard library to
6279 an external libdebug crate.
6280 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
6281 have been renamed to Eq/Ord.
6282 * The select/plural methods have been removed from format!. The escapes
6283 for { and } have also changed from \{ and \} to {{ and }},
6285 * The TaskBuilder API has been re-worked to be a true builder, and
6286 extension traits for spawning native/green tasks have been added.
6289 * All breaking changes to the language or libraries now have their
6290 commit message annotated with `[breaking-change]` to allow for easy
6291 discovery of breaking changes.
6292 * The compiler will now try to suggest how to annotate lifetimes if a
6293 lifetime-related error occurs.
6294 * Debug info continues to be improved greatly with general bug fixes and
6295 better support for situations like link time optimization (LTO).
6296 * Usage of syntax extensions when cross-compiling has been fixed.
6297 * Functionality equivalent to GCC & Clang's -ffunction-sections,
6298 -fdata-sections and --gc-sections has been enabled by default
6299 * The compiler is now stricter about where it will load module files
6300 from when a module is declared via `mod foo;`.
6301 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
6302 Syntax extensions are now discovered via a "plugin registrar" type
6303 which will be extended in the future to other various plugins.
6304 * Lints have been restructured to allow for dynamically loadable lints.
6305 * A number of rustdoc improvements:
6306 * The HTML output has been visually redesigned.
6307 * Markdown is now powered by hoedown instead of sundown.
6308 * Searching heuristics have been greatly improved.
6309 * The search index has been reduced in size by a great amount.
6310 * Cross-crate documentation via `pub use` has been greatly improved.
6311 * Primitive types are now hyperlinked and documented.
6312 * Documentation has been moved from static.rust-lang.org/doc to
6314 * A new sandbox, play.rust-lang.org, is available for running and
6315 sharing rust code examples on-line.
6316 * Unused attributes are now more robustly warned about.
6317 * The dead_code lint now warns about unused struct fields.
6318 * Cross-compiling to iOS is now supported.
6319 * Cross-compiling to mipsel is now supported.
6320 * Stability attributes are now inherited by default and no longer apply
6321 to intra-crate usage, only inter-crate usage.
6322 * Error message related to non-exhaustive match expressions have been
6326 Version 0.10 (2014-04-03)
6327 =========================
6329 * ~1500 changes, numerous bugfixes
6332 * A new RFC process is now in place for modifying the language.
6333 * Patterns with `@`-pointers have been removed from the language.
6334 * Patterns with unique vectors (`~[T]`) have been removed from the
6336 * Patterns with unique strings (`~str`) have been removed from the
6338 * `@str` has been removed from the language.
6339 * `@[T]` has been removed from the language.
6340 * `@self` has been removed from the language.
6341 * `@Trait` has been removed from the language.
6342 * Headers on `~` allocations which contain `@` boxes inside the type for
6343 reference counting have been removed.
6344 * The semantics around the lifetimes of temporary expressions have changed,
6345 see #3511 and #11585 for more information.
6346 * Cross-crate syntax extensions are now possible, but feature gated. See
6347 #11151 for more information. This includes both `macro_rules!` macros as
6348 well as syntax extensions such as `format!`.
6349 * New lint modes have been added, and older ones have been turned on to be
6351 * Unnecessary parentheses
6354 * Uppercase variables
6355 * Publicly visible private types
6356 * `#[deriving]` with raw pointers
6357 * Unsafe functions can no longer be coerced to closures.
6358 * Various obscure macros such as `log_syntax!` are now behind feature gates.
6359 * The `#[simd]` attribute is now behind a feature gate.
6360 * Visibility is no longer allowed on `extern crate` statements, and
6361 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
6362 * Trailing commas are now allowed in argument lists and tuple patterns.
6363 * The `do` keyword has been removed, it is now a reserved keyword.
6364 * Default type parameters have been implemented, but are feature gated.
6365 * Borrowed variables through captures in closures are now considered soundly.
6366 * `extern mod` is now `extern crate`
6367 * The `Freeze` trait has been removed.
6368 * The `Share` trait has been added for types that can be shared among
6370 * Labels in macros are now hygienic.
6371 * Expression/statement macro invocations can be delimited with `{}` now.
6372 * Treatment of types allowed in `static mut` locations has been tweaked.
6373 * The `*` and `.` operators are now overloadable through the `Deref` and
6375 * `~Trait` and `proc` no longer have `Send` bounds by default.
6376 * Partial type hints are now supported with the `_` type marker.
6377 * An `Unsafe` type was introduced for interior mutability. It is now
6378 considered undefined to transmute from `&T` to `&mut T` without using the
6380 * The #[linkage] attribute was implemented for extern statics/functions.
6381 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6382 * `Pod` was renamed to `Copy`.
6385 * The `libextra` library has been removed. It has now been decomposed into
6386 component libraries with smaller and more focused nuggets of
6387 functionality. The full list of libraries can be found on the
6388 documentation index page.
6389 * std: `std::condition` has been removed. All I/O errors are now propagated
6390 through the `Result` type. In order to assist with error handling, a
6391 `try!` macro for unwrapping errors with an early return and a lint for
6392 unused results has been added. See #12039 for more information.
6393 * std: The `vec` module has been renamed to `slice`.
6394 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6395 This will become the only growable vector in the future.
6396 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6397 are now found at `std::io::BufferedReader` instead of
6398 `std::io::buffered::BufferedReader`.
6399 * std: `print` and `println` are no longer in the prelude, the `print!` and
6400 `println!` macros are intended to be used instead.
6401 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6402 attempts to statically prevent cycles.
6403 * std: The standard distribution is adopting the policy of pushing failure
6404 to the user rather than failing in libraries. Many functions (such as
6405 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6406 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6407 deriving mode: `#[deriving(Show)]`.
6408 * std: `ToStr` is now implemented for all types implementing `Show`.
6409 * std: The formatting trait methods now take `&self` instead of `&T`
6410 * std: The `invert()` method on iterators has been renamed to `rev()`
6411 * std: `std::num` has seen a reduction in the genericity of its traits,
6412 consolidating functionality into a few core traits.
6413 * std: Backtraces are now printed on task failure if the environment
6414 variable `RUST_BACKTRACE` is present.
6415 * std: Naming conventions for iterators have been standardized. More details
6416 can be found on the wiki's style guide.
6417 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6418 still implement the function.
6419 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6420 * std: `assert_approx_eq!` has been removed
6421 * std: The `e` and `E` formatting specifiers for floats have been added to
6422 print them in exponential notation.
6423 * std: The `Times` trait has been removed
6424 * std: Indications of variance and opting out of builtin bounds is done
6425 through marker types in `std::kinds::marker` now
6426 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6427 `#[deriving(Hash)]` is now possible.
6428 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6429 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6430 * std: `Chan::new` is now `channel()`.
6431 * std: A new synchronous channel type has been implemented.
6432 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6433 * std: `hashmap` and `trie` have been moved to `libcollections`
6434 * std: `run` has been rolled into `io::process`
6435 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6436 * std: The equality and comparison traits have seen some reorganization.
6437 * std: `rand` has moved to `librand`.
6438 * std: `to_{lower,upper}case` has been implemented for `char`.
6439 * std: Logging has been moved to `liblog`.
6440 * collections: `HashMap` has been rewritten for higher performance and less
6442 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6443 it can be booted manually. The runtime guide has more information and
6445 * native: All I/O functionality except signals has been implemented.
6446 * green: Task spawning with `libgreen` has been optimized with stack caching
6447 and various trimming of code.
6448 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6449 * sync: The `extra::sync` module has been updated to modern rust (and moved
6450 to the `sync` library), tweaking and improving various interfaces while
6451 dropping redundant functionality.
6452 * sync: A new `Barrier` type has been added to the `sync` library.
6453 * sync: An efficient mutex for native and green tasks has been implemented.
6454 * serialize: The `base64` module has seen some improvement. It treats
6455 newlines better, has non-string error values, and has seen general
6457 * fourcc: A `fourcc!` macro was introduced
6458 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6459 hexadecimal literal.
6462 * `rustpkg` has been deprecated and removed from the main repository. Its
6463 replacement, `cargo`, is under development.
6464 * Nightly builds of rust are now available
6465 * The memory usage of rustc has been improved many times throughout this
6467 * The build process supports disabling rpath support for the rustc binary
6469 * Code generation has improved in some cases, giving more information to the
6470 LLVM optimization passes to enable more extensive optimizations.
6471 * Debuginfo compatibility with lldb on OSX has been restored.
6472 * The master branch is now gated on an android bot, making building for
6473 android much more reliable.
6474 * Output flags have been centralized into one `--emit` flag.
6475 * Crate type flags have been centralized into one `--crate-type` flag.
6476 * Codegen flags have been consolidated behind a `-C` flag.
6477 * Linking against outdated crates now has improved error messages.
6478 * Error messages with lifetimes will often suggest how to annotate the
6479 function to fix the error.
6480 * Many more types are documented in the standard library, and new guides
6482 * Many `rustdoc` improvements:
6483 * code blocks are syntax highlighted.
6484 * render standalone markdown files.
6485 * the --test flag tests all code blocks by default.
6486 * exported macros are displayed.
6487 * re-exported types have their documentation inlined at the location of the
6489 * search works across crates that have been rendered to the same output
6493 Version 0.9 (2014-01-09)
6494 ==========================
6496 * ~1800 changes, numerous bugfixes
6499 * The `float` type has been removed. Use `f32` or `f64` instead.
6500 * A new facility for enabling experimental features (feature gating) has
6501 been added, using the crate-level `#[feature(foo)]` attribute.
6502 * Managed boxes (@) are now behind a feature gate
6503 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6504 standard library's `Gc` or `Rc` types instead.
6505 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6506 * Jumping back to the top of a loop is now done with `continue` instead of
6508 * Strings can no longer be mutated through index assignment.
6509 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6510 hash delimiters, as in `r###"foo"###`.
6511 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6513 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6514 * `@fn`s have been removed.
6515 * `do` only works with procs in order to make it obvious what the cost
6517 * Single-element tuple-like structs can no longer be dereferenced to
6518 obtain the inner value. A more comprehensive solution for overloading
6519 the dereference operator will be provided in the future.
6520 * The `#[link(...)]` attribute has been replaced with
6521 `#[crate_id = "name#vers"]`.
6522 * Empty `impl`s must be terminated with empty braces and may not be
6523 terminated with a semicolon.
6524 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6525 no longer has any special meaning.
6526 * The old `fmt!` string formatting macro has been removed.
6527 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6528 `print!` and `println!`.
6529 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6530 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6531 `extern mod foo = "bar"` instead.
6532 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6533 * Macros can have attributes.
6534 * Macros can expand to items with attributes.
6535 * Macros can expand to multiple items.
6536 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6537 * Comments may be nested.
6538 * Values automatically coerce to trait objects they implement, without
6540 * Enum discriminants are no longer an entire word but as small as needed to
6541 contain all the variants. The `repr` attribute can be used to override
6542 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6543 `#[repr(C)]` to match C enums.
6544 * Non-string literals are not allowed in attributes (they never worked).
6545 * The FFI now supports variadic functions.
6546 * Octal numeric literals, as in `0o7777`.
6547 * The `concat!` syntax extension performs compile-time string concatenation.
6548 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6549 removed as Rust no longer uses segmented stacks.
6550 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6551 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6552 not `*`; ignoring remaining fields of a struct is also done with `..`,
6553 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6554 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6555 * `rustc` supports the "system" calling convention, which defaults to the
6556 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6558 * The `type_overflow` lint (default: warn) checks literals for overflow.
6559 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6560 * The `attribute_usage` lint (default: warn) warns about unknown
6562 * The `unknown_features` lint (default: warn) warns about unknown
6564 * The `dead_code` lint (default: warn) checks for dead code.
6565 * Rust libraries can be linked statically to one another
6566 * `#[link_args]` is behind the `link_args` feature gate.
6567 * Native libraries are now linked with `#[link(name = "foo")]`
6568 * Native libraries can be statically linked to a rust crate
6569 (`#[link(name = "foo", kind = "static")]`).
6570 * Native OS X frameworks are now officially supported
6571 (`#[link(name = "foo", kind = "framework")]`).
6572 * The `#[thread_local]` attribute creates thread-local (not task-local)
6573 variables. Currently behind the `thread_local` feature gate.
6574 * The `return` keyword may be used in closures.
6575 * Types that can be copied via a memcpy implement the `Pod` kind.
6576 * The `cfg` attribute can now be used on struct fields and enum variants.
6579 * std: The `option` and `result` API's have been overhauled to make them
6580 simpler, more consistent, and more composable.
6581 * std: The entire `std::io` module has been replaced with one that is
6582 more comprehensive and that properly interfaces with the underlying
6583 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6585 * std: `io::util` contains a number of useful implementations of
6586 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6587 `ZeroReader`, `TeeReader`.
6588 * std: The reference counted pointer type `extra::rc` moved into std.
6589 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6590 just a wrapper around it).
6591 * std: The `Either` type has been removed.
6592 * std: `fmt::Default` can be implemented for any type to provide default
6593 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6594 * std: The `rand` API continues to be tweaked.
6595 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6596 on failure in gdb, is now named `rust_fail`.
6597 * std: The `each_key` and `each_value` methods on `HashMap` have been
6598 replaced by the `keys` and `values` iterators.
6599 * std: Functions dealing with type size and alignment have moved from the
6600 `sys` module to the `mem` module.
6601 * std: The `path` module was written and API changed.
6602 * std: `str::from_utf8` has been changed to cast instead of allocate.
6603 * std: `starts_with` and `ends_with` methods added to vectors via the
6604 `ImmutableEqVector` trait, which is in the prelude.
6605 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6606 if the index is out of bounds.
6607 * std: Task failure no longer propagates between tasks, as the model was
6608 complex, expensive, and incompatible with thread-based tasks.
6609 * std: The `Any` type can be used for dynamic typing.
6610 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6612 * std: Methods that produce iterators generally do not have an `_iter`
6614 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6615 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6616 * std: `util::ignore` renamed to `prelude::drop`.
6617 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6619 * std: `vec::raw` has seen a lot of cleanup and API changes.
6620 * std: The standard library no longer includes any C++ code, and very
6621 minimal C, eliminating the dependency on libstdc++.
6622 * std: Runtime scheduling and I/O functionality has been factored out into
6623 extensible interfaces and is now implemented by two different crates:
6624 libnative, for native threading and I/O; and libgreen, for green threading
6625 and I/O. This paves the way for using the standard library in more limited
6626 embedded environments.
6627 * std: The `comm` module has been rewritten to be much faster, have a
6628 simpler, more consistent API, and to work for both native and green
6630 * std: All libuv dependencies have been moved into the rustuv crate.
6631 * native: New implementations of runtime scheduling on top of OS threads.
6632 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6634 * green: The green thread scheduler and message passing types are almost
6636 * extra: The `flatpipes` module had bitrotted and was removed.
6637 * extra: All crypto functions have been removed and Rust now has a policy of
6638 not reimplementing crypto in the standard library. In the future crypto
6639 will be provided by external crates with bindings to established libraries.
6640 * extra: `c_vec` has been modernized.
6641 * extra: The `sort` module has been removed. Use the `sort` method on
6645 * The `rust` and `rusti` commands have been removed, due to lack of
6647 * `rustdoc` was completely rewritten.
6648 * `rustdoc` can test code examples in documentation.
6649 * `rustpkg` can test packages with the argument, 'test'.
6650 * `rustpkg` supports arbitrary dependencies, including C libraries.
6651 * `rustc`'s support for generating debug info is improved again.
6652 * `rustc` has better error reporting for unbalanced delimiters.
6653 * `rustc`'s JIT support was removed due to bitrot.
6654 * Executables and static libraries can be built with LTO (-Z lto)
6655 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6659 Version 0.8 (2013-09-26)
6660 ============================
6662 * ~2200 changes, numerous bugfixes
6665 * The `for` loop syntax has changed to work with the `Iterator` trait.
6666 * At long last, unwinding works on Windows.
6667 * Default methods are ready for use.
6668 * Many trait inheritance bugs fixed.
6669 * Owned and borrowed trait objects work more reliably.
6670 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6671 * rustc can omit emission of code for the `debug!` macro if it is passed
6673 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6674 for foo.rs, then foo/mod.rs, and will generate an error when both are
6676 * Strings no longer contain trailing nulls. The new `std::c_str` module
6677 provides new mechanisms for converting to C strings.
6678 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6679 * The FFI has been overhauled such that foreign functions are called directly,
6680 instead of through a stack-switching wrapper.
6681 * Calling a foreign function must be done through a Rust function with the
6682 `#[fixed_stack_segment]` attribute.
6683 * The `externfn!` macro can be used to declare both a foreign function and
6684 a `#[fixed_stack_segment]` wrapper at once.
6685 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6686 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6687 * `priv` is disallowed everywhere except for struct fields and enum variants.
6688 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6689 * `ref` bindings in irrefutable patterns work correctly now.
6690 * `char` is now prevented from containing invalid code points.
6691 * Casting to `bool` is no longer allowed.
6692 * `\0` is now accepted as an escape in chars and strings.
6693 * `yield` is a reserved keyword.
6694 * `typeof` is a reserved keyword.
6695 * Crates may be imported by URL with `extern mod foo = "url";`.
6696 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6697 * Static vectors can be initialized with repeating elements,
6698 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6699 * Static structs can be initialized with functional record update,
6700 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6701 * `cfg!` can be used to conditionally execute code based on the crate
6702 configuration, similarly to `#[cfg(...)]`.
6703 * The `unnecessary_qualification` lint detects unneeded module
6704 prefixes (default: allow).
6705 * Arithmetic operations have been implemented on the SIMD types in
6706 `std::unstable::simd`.
6707 * Exchange allocation headers were removed, reducing memory usage.
6708 * `format!` implements a completely new, extensible, and higher-performance
6709 string formatting system. It will replace `fmt!`.
6710 * `print!` and `println!` write formatted strings (using the `format!`
6711 extension) to stdout.
6712 * `write!` and `writeln!` write formatted strings (using the `format!`
6713 extension) to the new Writers in `std::rt::io`.
6714 * The library section in which a function or static is placed may
6715 be specified with `#[link_section = "..."]`.
6716 * The `proto!` syntax extension for defining bounded message protocols
6718 * `macro_rules!` is hygienic for `let` declarations.
6719 * The `#[export_name]` attribute specifies the name of a symbol.
6720 * `unreachable!` can be used to indicate unreachable code, and fails
6724 * std: Transitioned to the new runtime, written in Rust.
6725 * std: Added an experimental I/O library, `rt::io`, based on the new
6727 * std: A new generic `range` function was added to the prelude, replacing
6728 `uint::range` and friends.
6729 * std: `range_rev` no longer exists. Since range is an iterator it can be
6730 reversed with `range(lo, hi).invert()`.
6731 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6732 renamed to `unwrap_or`.
6733 * std: The `iterator` module was renamed to `iter`.
6734 * std: Integral types now support the `checked_add`, `checked_sub`, and
6735 `checked_mul` operations for detecting overflow.
6736 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6738 * std: Methods are standardizing on conventions for casting methods:
6739 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6741 * std: The `CString` type in `c_str` provides new ways to convert to and
6743 * std: `DoubleEndedIterator` can yield elements in two directions.
6744 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6746 * std: `str::from_bytes` renamed to `str::from_utf8`.
6747 * std: `pop_opt` and `shift_opt` methods added to vectors.
6748 * std: The task-local data interface no longer uses @, and keys are
6749 no longer function pointers.
6750 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6751 * std: Added `SharedPort` to `comm`.
6752 * std: `Eq` has a default method for `ne`; only `eq` is required
6754 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6755 is required in implementations.
6756 * std: `is_utf8` performance is improved, impacting many string functions.
6757 * std: `os::MemoryMap` provides cross-platform mmap.
6758 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6759 are not 'in-bounds' are considered undefined.
6760 * std: Many freestanding functions in `vec` removed in favor of methods.
6761 * std: Many freestanding functions on scalar types removed in favor of
6763 * std: Many options to task builders were removed since they don't make
6764 sense in the new scheduler design.
6765 * std: More containers implement `FromIterator` so can be created by the
6767 * std: More complete atomic types in `unstable::atomics`.
6768 * std: `comm::PortSet` removed.
6769 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6770 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6771 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6772 default implementations.
6773 * std: Various `from_str` functions were removed in favor of a generic
6774 `from_str` which is available in the prelude.
6775 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6776 * extra: `dlist`, the doubly-linked list was modernized.
6777 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6778 * extra: Added `glob` module, replacing `std::os::glob`.
6779 * extra: `rope` was removed.
6780 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6781 * extra: `net`, and `timer` were removed. The experimental replacements
6782 are `std::rt::io::net` and `std::rt::io::timer`.
6783 * extra: Iterators implemented for `SmallIntMap`.
6784 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6785 * extra: `SmallIntSet` removed. Use `BitvSet`.
6786 * extra: Performance of JSON parsing greatly improved.
6787 * extra: `semver` updated to SemVer 2.0.0.
6788 * extra: `term` handles more terminals correctly.
6789 * extra: `dbg` module removed.
6790 * extra: `par` module removed.
6791 * extra: `future` was cleaned up, with some method renames.
6792 * extra: Most free functions in `getopts` were converted to methods.
6795 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6796 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6797 similarly to gcc's `--march` flag.
6798 * rustc's performance compiling small crates is much better.
6799 * rustpkg has received many improvements.
6800 * rustpkg supports git tags as package IDs.
6801 * rustpkg builds into target-specific directories so it can be used for
6803 * The number of concurrent test tasks is controlled by the environment
6804 variable RUST_TEST_TASKS.
6805 * The test harness can now report metrics for benchmarks.
6806 * All tools have man pages.
6807 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6808 * The runtime uses jemalloc for allocations.
6809 * Segmented stacks are temporarily disabled as part of the transition to
6810 the new runtime. Stack overflows are possible!
6811 * A new documentation backend, rustdoc_ng, is available for use. It is
6812 still invoked through the normal `rustdoc` command.
6815 Version 0.7 (2013-07-03)
6816 =======================
6818 * ~2000 changes, numerous bugfixes
6821 * `impl`s no longer accept a visibility qualifier. Put them on methods
6823 * The borrow checker has been rewritten with flow-sensitivity, fixing
6824 many bugs and inconveniences.
6825 * The `self` parameter no longer implicitly means `&'self self`,
6826 and can be explicitly marked with a lifetime.
6827 * Overloadable compound operators (`+=`, etc.) have been temporarily
6828 removed due to bugs.
6829 * The `for` loop protocol now requires `for`-iterators to return `bool`
6830 so they compose better.
6831 * The `Durable` trait is replaced with the `'static` bounds.
6832 * Trait default methods work more often.
6833 * Structs with the `#[packed]` attribute have byte alignment and
6834 no padding between fields.
6835 * Type parameters bound by `Copy` must now be copied explicitly with
6837 * It is now illegal to move out of a dereferenced unsafe pointer.
6838 * `Option<~T>` is now represented as a nullable pointer.
6839 * `@mut` does dynamic borrow checks correctly.
6840 * The `main` function is only detected at the topmost level of the crate.
6841 The `#[main]` attribute is still valid anywhere.
6842 * Struct fields may no longer be mutable. Use inherited mutability.
6843 * The `#[no_send]` attribute makes a type that would otherwise be
6845 * The `#[no_freeze]` attribute makes a type that would otherwise be
6847 * Unbounded recursion will abort the process after reaching the limit
6848 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6849 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6850 are never implicitly copyable.
6851 * `#[static_assert]` makes compile-time assertions about static bools.
6852 * At long last, 'argument modes' no longer exist.
6853 * The rarely used `use mod` statement no longer exists.
6856 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6858 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6859 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6861 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6862 and unsuffixed integer literals.
6865 * The `core` crate was renamed to `std`.
6866 * The `std` crate was renamed to `extra`.
6867 * More and improved documentation.
6868 * std: `iterator` module for external iterator objects.
6869 * Many old-style (internal, higher-order function) iterators replaced by
6870 implementations of `Iterator`.
6871 * std: Many old internal vector and string iterators,
6872 incl. `any`, `all`. removed.
6873 * std: The `finalize` method of `Drop` renamed to `drop`.
6874 * std: The `drop` method now takes `&mut self` instead of `&self`.
6875 * std: The prelude no longer re-exports any modules, only types and traits.
6876 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6877 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6878 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6879 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6880 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6881 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6882 * std: Many types implement `Clone`.
6883 * std: `path` type renamed to `Path`.
6884 * std: `mut` module and `Mut` type removed.
6885 * std: Many standalone functions removed in favor of methods and iterators
6886 in `vec`, `str`. In the future methods will also work as functions.
6887 * std: `reinterpret_cast` removed. Use `transmute`.
6888 * std: ascii string handling in `std::ascii`.
6889 * std: `Rand` is implemented for ~/@.
6890 * std: `run` module for spawning processes overhauled.
6891 * std: Various atomic types added to `unstable::atomic`.
6892 * std: Various types implement `Zero`.
6893 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6894 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6895 * std: Added `os::mkdir_recursive`.
6896 * std: Added `os::glob` function performs filesystems globs.
6897 * std: `FuzzyEq` renamed to `ApproxEq`.
6898 * std: `Map` now defines `pop` and `swap` methods.
6899 * std: `Cell` constructors converted to static methods.
6900 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6901 * extra: `flate` module moved from `std` to `extra`.
6902 * extra: `fileinput` module for iterating over a series of files.
6903 * extra: `Complex` number type and `complex` module.
6904 * extra: `Rational` number type and `rational` module.
6905 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6906 * extra: `term` uses terminfo now, is more correct.
6907 * extra: `arc` functions converted to methods.
6908 * extra: Implementation of fixed output size variations of SHA-2.
6911 * `unused_variable` lint mode for unused variables (default: warn).
6912 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6914 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6916 * `dead_assignment` lint mode for unread variables (default: warn).
6917 * `unnecessary_allocation` lint mode detects some heap allocations that are
6918 immediately borrowed so could be written without allocating (default: warn).
6919 * `missing_doc` lint mode (default: allow).
6920 * `unreachable_code` lint mode (default: warn).
6921 * The `rusti` command has been rewritten and a number of bugs addressed.
6922 * rustc outputs in color on more terminals.
6923 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6924 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6925 * Compiling with `-g` will make the binary record information about
6926 dynamic borrowcheck failures for debugging.
6927 * rustdoc has a nicer stylesheet.
6928 * Various improvements to rustdoc.
6929 * Improvements to rustpkg (see the detailed release notes).
6932 Version 0.6 (2013-04-03)
6933 ========================
6935 * ~2100 changes, numerous bugfixes
6938 * The self type parameter in traits is now spelled `Self`
6939 * The `self` parameter in trait and impl methods must now be explicitly
6940 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6941 * Static methods no longer require the `static` keyword and instead
6942 are distinguished by the lack of a `self` parameter
6943 * Replaced the `Durable` trait with the `'static` lifetime
6944 * The old closure type syntax with the trailing sigil has been
6945 removed in favor of the more consistent leading sigil
6946 * `super` is a keyword, and may be prefixed to paths
6947 * Trait bounds are separated with `+` instead of whitespace
6948 * Traits are implemented with `impl Trait for Type`
6949 instead of `impl Type: Trait`
6950 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6951 * The `export` keyword has finally been removed
6952 * The `move` keyword has been removed (see "Semantic changes")
6953 * The interior mutability qualifier on vectors, `[mut T]`, has been
6954 removed. Use `&mut [T]`, etc.
6955 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6956 * `fail` is no longer a keyword. Use `fail!()`
6957 * `assert` is no longer a keyword. Use `assert!()`
6958 * `log` is no longer a keyword. use `debug!`, etc.
6959 * 1-tuples may be represented as `(T,)`
6960 * Struct fields may no longer be `mut`. Use inherited mutability,
6961 `@mut T`, `core::mut` or `core::cell`
6962 * `extern mod { ... }` is no longer valid syntax for foreign
6963 function modules. Use extern blocks: `extern { ... }`
6964 * Newtype enums removed. Use tuple-structs.
6965 * Trait implementations no longer support visibility modifiers
6966 * Pattern matching over vectors improved and expanded
6967 * `const` renamed to `static` to correspond to lifetime name,
6968 and make room for future `static mut` unsafe mutable globals.
6969 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6970 * `Clone` implementations can be automatically generated with
6971 `#[deriving(Clone)]`
6972 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6973 instead of `foo as Bar`.
6974 * Fixed length vector types are now written as `[int, .. 3]`
6975 instead of `[int * 3]`.
6976 * Fixed length vector types can express the length as a constant
6977 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
6980 * Types with owned pointers or custom destructors move by default,
6981 eliminating the `move` keyword
6982 * All foreign functions are considered unsafe
6983 * &mut is now unaliasable
6984 * Writes to borrowed @mut pointers are prevented dynamically
6986 * The name of the main function can be customized using #[main]
6987 * The default type of an inferred closure is &fn instead of @fn
6988 * `use` statements may no longer be "chained" - they cannot import
6989 identifiers imported by previous `use` statements
6990 * `use` statements are crate relative, importing from the "top"
6991 of the crate by default. Paths may be prefixed with `super::`
6992 or `self::` to change the search behavior.
6993 * Method visibility is inherited from the implementation declaration
6994 * Structural records have been removed
6995 * Many more types can be used in static items, including enums
6996 'static-lifetime pointers and vectors
6997 * Pattern matching over vectors improved and expanded
6998 * Typechecking of closure types has been overhauled to
6999 improve inference and eliminate unsoundness
7000 * Macros leave scope at the end of modules, unless that module is
7001 tagged with #[macro_escape]
7004 * Added big integers to `std::bigint`
7005 * Removed `core::oldcomm` module
7006 * Added pipe-based `core::comm` module
7007 * Numeric traits have been reorganized under `core::num`
7008 * `vec::slice` finally returns a slice
7009 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7010 * Containers reorganized around traits in `core::container`
7011 * `core::dvec` removed, `~[T]` is a drop-in replacement
7012 * `core::send_map` renamed to `core::hashmap`
7013 * `std::map` removed; replaced with `core::hashmap`
7014 * `std::treemap` reimplemented as an owned balanced tree
7015 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7016 * `core::trie` added as a fast ordered map for integer keys
7017 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7018 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7019 overload the comparison operators, whereas `TotalOrd` is used
7020 by certain container types
7023 * Replaced the 'cargo' package manager with 'rustpkg'
7024 * Added all-purpose 'rust' tool
7025 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7026 * rustc now *attempts* to offer spelling suggestions
7027 * Improved support for ARM and Android
7028 * Preliminary MIPS backend
7029 * Improved foreign function ABI implementation for x86, x86_64
7030 * Various memory usage improvements
7031 * Rust code may be embedded in foreign code under limited circumstances
7032 * Inline assembler supported by new asm!() syntax extension.
7035 Version 0.5 (2012-12-21)
7036 ===========================
7038 * ~900 changes, numerous bugfixes
7041 * Removed `<-` move operator
7042 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7043 * Removed old fixed length vector syntax - `[T]/N`
7044 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7045 * Macros may now expand to items and statements
7046 * `a.b()` is always parsed as a method call, never as a field projection
7047 * `Eq` and `IterBytes` implementations can be automatically generated
7048 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7049 * Removed the special crate language for `.rc` files
7050 * Function arguments may consist of any irrefutable pattern
7053 * `&` and `~` pointers may point to objects
7054 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7055 * Enum variants may be structs
7056 * Destructors can be added to all nominal types with the Drop trait
7057 * Structs and nullary enum variants may be constants
7058 * Values that cannot be implicitly copied are now automatically moved
7059 without writing `move` explicitly
7060 * `&T` may now be coerced to `*T`
7061 * Coercions happen in `let` statements as well as function calls
7062 * `use` statements now take crate-relative paths
7063 * The module and type namespaces have been merged so that static
7064 method names can be resolved under the trait in which they are
7067 * Improved support for language features
7068 * Trait inheritance works in many scenarios
7069 * More support for explicit self arguments in methods - `self`, `&self`
7070 `@self`, and `~self` all generally work as expected
7071 * Static methods work in more situations
7072 * Experimental: Traits may declare default methods for the implementations
7076 * New condition handling system in `core::condition`
7077 * Timsort added to `std::sort`
7078 * New priority queue, `std::priority_queue`
7079 * Pipes for serializable types, `std::flatpipes'
7080 * Serialization overhauled to be trait-based
7081 * Expanded `getopts` definitions
7082 * Moved futures to `std`
7083 * More functions are pure now
7084 * `core::comm` renamed to `oldcomm`. Still deprecated
7085 * `rustdoc` and `cargo` are libraries now
7088 * Added a preliminary REPL, `rusti`
7089 * License changed from MIT to dual MIT/APL2
7092 Version 0.4 (2012-10-15)
7093 ==========================
7095 * ~2000 changes, numerous bugfixes
7098 * All keywords are now strict and may not be used as identifiers anywhere
7099 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7100 'of', 'with', 'to', 'class'.
7101 * Classes are replaced with simpler structs
7102 * Explicit method self types
7103 * `ret` became `return` and `alt` became `match`
7104 * `import` is now `use`; `use is now `extern mod`
7105 * `extern mod { ... }` is now `extern { ... }`
7106 * `use mod` is the recommended way to import modules
7107 * `pub` and `priv` replace deprecated export lists
7108 * The syntax of `match` pattern arms now uses fat arrow (=>)
7109 * `main` no longer accepts an args vector; use `os::args` instead
7112 * Trait implementations are now coherent, ala Haskell typeclasses
7113 * Trait methods may be static
7114 * Argument modes are deprecated
7115 * Borrowed pointers are much more mature and recommended for use
7116 * Strings and vectors in the static region are stored in constant memory
7117 * Typestate was removed
7118 * Resolution rewritten to be more reliable
7119 * Support for 'dual-mode' data structures (freezing and thawing)
7122 * Most binary operators can now be overloaded via the traits in
7124 * `std::net::url` for representing URLs
7125 * Sendable hash maps in `core::send_map`
7126 * `core::task' gained a (currently unsafe) task-local storage API
7129 * An efficient new intertask communication primitive called the pipe,
7130 along with a number of higher-level channel types, in `core::pipes`
7131 * `std::arc`, an atomically reference counted, immutable, shared memory
7133 * `std::sync`, various exotic synchronization tools based on arcs and pipes
7134 * Futures are now based on pipes and sendable
7135 * More robust linked task failure
7136 * Improved task builder API
7139 * Improved error reporting
7140 * Preliminary JIT support
7141 * Preliminary work on precise GC
7142 * Extensive architectural improvements to rustc
7143 * Begun a transition away from buggy C++-based reflection (shape) code to
7144 Rust-based (visitor) code
7145 * All hash functions and tables converted to secure, randomized SipHash
7148 Version 0.3 (2012-07-12)
7149 ========================
7151 * ~1900 changes, numerous bugfixes
7153 * New coding conveniences
7154 * Integer-literal suffix inference
7155 * Per-item control over warnings, errors
7156 * #[cfg(windows)] and #[cfg(unix)] attributes
7157 * Documentation comments
7158 * More compact closure syntax
7159 * 'do' expressions for treating higher-order functions as
7161 * *-patterns (wildcard extended to all constructor fields)
7164 * Name resolution pass and exhaustiveness checker rewritten
7165 * Region pointers and borrow checking supersede alias
7167 * Init-ness checking is now provided by a region-based liveness
7168 pass instead of the typestate pass; same for last-use analysis
7169 * Extensive work on region pointers
7171 * Experimental new language features
7172 * Slices and fixed-size, interior-allocated vectors
7173 * #!-comments for lang versioning, shell execution
7174 * Destructors and iface implementation for classes;
7175 type-parameterized classes and class methods
7176 * 'const' type kind for types that can be used to implement
7177 shared-memory concurrency patterns
7181 * Removal of various obsolete features
7182 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
7183 'crust', 'native' (now 'extern'), 'cont' (now 'again')
7185 * Constructs: do-while loops ('do' repurposed), fn binding,
7186 resources (replaced by destructors)
7188 * Compiler reorganization
7189 * Syntax-layer of compiler split into separate crate
7190 * Clang (from LLVM project) integrated into build
7191 * Typechecker split into sub-modules
7194 * New time functions
7195 * Extension methods for many built-in types
7196 * Arc: atomic-refcount read-only / exclusive-use shared cells
7197 * Par: parallel map and search routines
7198 * Extensive work on libuv interface
7199 * Much vector code moved to libraries
7200 * Syntax extensions: #line, #col, #file, #mod, #stringify,
7201 #include, #include_str, #include_bin
7204 * Cargo automatically resolves dependencies
7207 Version 0.2 (2012-03-29)
7208 =========================
7210 * >1500 changes, numerous bugfixes
7212 * New docs and doc tooling
7214 * New port: FreeBSD x86_64
7216 * Compilation model enhancements
7217 * Generics now specialized, multiply instantiated
7218 * Functions now inlined across separate crates
7220 * Scheduling, stack and threading fixes
7221 * Noticeably improved message-passing performance
7222 * Explicit schedulers
7226 * Experimental new language features
7227 * Operator overloading
7231 * Various language extensions
7232 * C-callback function types: 'crust fn ...'
7233 * Infinite-loop construct: 'loop { ... }'
7234 * Shorten 'mutable' to 'mut'
7235 * Required mutable-local qualifier: 'let mut ...'
7236 * Basic glob-exporting: 'export foo::*;'
7237 * Alt now exhaustive, 'alt check' for runtime-checked
7238 * Block-function form of 'for' loop, with 'break' and 'ret'.
7241 * AST quasi-quote syntax extension
7242 * Revived libuv interface
7243 * New modules: core::{future, iter}, std::arena
7244 * Merged per-platform std::{os*, fs*} to core::{libc, os}
7245 * Extensive cleanup, regularization in libstd, libcore
7248 Version 0.1 (2012-01-20)
7249 ===============================
7251 * Most language features work, including:
7252 * Unique pointers, unique closures, move semantics
7253 * Interface-constrained generics
7254 * Static interface dispatch
7256 * Multithread task scheduling
7257 * Typestate predicates
7258 * Failure unwinding, destructors
7259 * Pattern matching and destructuring assignment
7260 * Lightweight block-lambda syntax
7261 * Preliminary macro-by-example
7263 * Compiler works with the following configurations:
7264 * Linux: x86 and x86_64 hosts and targets
7265 * macOS: x86 and x86_64 hosts and targets
7266 * Windows: x86 hosts and targets
7268 * Cross compilation / multi-target configuration supported.
7270 * Preliminary API-documentation and package-management tools included.
7274 * Documentation is incomplete.
7276 * Performance is below intended target.
7278 * Standard library APIs are subject to extensive change, reorganization.
7280 * Language-level versioning is not yet operational - future code will