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 - [`i128::to_be_bytes`]
125 - [`i128::to_le_bytes`]
126 - [`i128::to_ne_bytes`]
127 - [`i128::from_be_bytes`]
128 - [`i128::from_le_bytes`]
129 - [`i128::from_ne_bytes`]
130 - [`isize::to_be_bytes`]
131 - [`isize::to_le_bytes`]
132 - [`isize::to_ne_bytes`]
133 - [`isize::from_be_bytes`]
134 - [`isize::from_le_bytes`]
135 - [`isize::from_ne_bytes`]
136 - [`u8::to_be_bytes`]
137 - [`u8::to_le_bytes`]
138 - [`u8::to_ne_bytes`]
139 - [`u8::from_be_bytes`]
140 - [`u8::from_le_bytes`]
141 - [`u8::from_ne_bytes`]
142 - [`u16::to_be_bytes`]
143 - [`u16::to_le_bytes`]
144 - [`u16::to_ne_bytes`]
145 - [`u16::from_be_bytes`]
146 - [`u16::from_le_bytes`]
147 - [`u16::from_ne_bytes`]
148 - [`u32::to_be_bytes`]
149 - [`u32::to_le_bytes`]
150 - [`u32::to_ne_bytes`]
151 - [`u32::from_be_bytes`]
152 - [`u32::from_le_bytes`]
153 - [`u32::from_ne_bytes`]
154 - [`u64::to_be_bytes`]
155 - [`u64::to_le_bytes`]
156 - [`u64::to_ne_bytes`]
157 - [`u64::from_be_bytes`]
158 - [`u64::from_le_bytes`]
159 - [`u64::from_ne_bytes`]
160 - [`u128::to_be_bytes`]
161 - [`u128::to_le_bytes`]
162 - [`u128::to_ne_bytes`]
163 - [`u128::from_be_bytes`]
164 - [`u128::from_le_bytes`]
165 - [`u128::from_ne_bytes`]
166 - [`usize::to_be_bytes`]
167 - [`usize::to_le_bytes`]
168 - [`usize::to_ne_bytes`]
169 - [`usize::from_be_bytes`]
170 - [`usize::from_le_bytes`]
171 - [`usize::from_ne_bytes`]
175 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
176 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
180 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
184 - [The argument types for AVX's
185 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
186 been changed from `*const` to `*mut` as the previous implementation
190 [55148]: https://github.com/rust-lang/rust/pull/55148/
191 [55238]: https://github.com/rust-lang/rust/pull/55238/
192 [55280]: https://github.com/rust-lang/rust/pull/55280/
193 [55610]: https://github.com/rust-lang/rust/pull/55610/
194 [55663]: https://github.com/rust-lang/rust/pull/55663/
195 [55702]: https://github.com/rust-lang/rust/pull/55702/
196 [55837]: https://github.com/rust-lang/rust/pull/55837/
197 [55843]: https://github.com/rust-lang/rust/pull/55843/
198 [56072]: https://github.com/rust-lang/rust/pull/56072/
199 [56245]: https://github.com/rust-lang/rust/pull/56245/
200 [56365]: https://github.com/rust-lang/rust/pull/56365/
201 [56366]: https://github.com/rust-lang/rust/pull/56366/
202 [56395]: https://github.com/rust-lang/rust/pull/56395/
203 [56759]: https://github.com/rust-lang/rust/pull/56759/
204 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
205 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
206 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
207 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
208 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
209 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
210 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
211 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
212 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
213 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
214 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
215 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
216 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
217 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
218 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
219 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
220 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
221 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
222 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
223 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
224 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
225 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
226 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
227 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
228 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
229 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
230 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
231 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
232 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
233 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
234 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
235 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
236 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
237 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
238 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
239 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
240 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
241 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
242 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
243 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
244 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
245 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
246 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
247 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
248 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
249 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
250 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
251 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
252 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
253 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
254 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
255 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
256 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
257 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
258 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
259 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
260 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
261 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
262 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
263 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
264 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
265 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
266 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
267 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
268 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
269 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
270 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
271 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
272 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
273 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
274 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
275 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
276 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
277 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
278 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
279 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
280 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
281 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
282 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
283 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
284 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
285 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
286 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
287 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
288 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
289 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
290 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
291 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
292 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
293 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
294 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
295 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
296 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
299 Version 1.31.1 (2018-12-20)
300 ===========================
302 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
303 - [Fix broken go-to-definition in RLS][rls/1171]
304 - [Fix infinite loop on hover in RLS][rls/1170]
306 [56562]: https://github.com/rust-lang/rust/pull/56562
307 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
308 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
310 Version 1.31.0 (2018-12-06)
311 ==========================
315 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
316 - [New lifetime elision rules now allow for eliding lifetimes in functions and
317 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
318 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
320 - [You can now define and use `const` functions.][54835] These are currently
321 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
322 [language reference][const-reference] for what exactly is available.
323 - [You can now use tool lints, which allow you to scope lints from external
324 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
325 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
326 a crate, not just in exported functions.][54451]
327 - [You can now use parentheses in pattern matches.][54497]
331 - [Updated musl to 1.1.20][54430]
335 - [You can now convert `num::NonZero*` types to their raw equivalvents using the
336 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
337 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
338 into `Option<&mut T>` using the `From` trait.][53218]
339 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
344 - [`slice::align_to`]
345 - [`slice::align_to_mut`]
346 - [`slice::chunks_exact`]
347 - [`slice::chunks_exact_mut`]
349 - [`slice::rchunks_mut`]
350 - [`slice::rchunks_exact`]
351 - [`slice::rchunks_exact_mut`]
352 - [`Option::replace`]
356 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
357 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
358 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
360 [52813]: https://github.com/rust-lang/rust/pull/52813/
361 [53218]: https://github.com/rust-lang/rust/pull/53218/
362 [53555]: https://github.com/rust-lang/rust/issues/53555/
363 [54057]: https://github.com/rust-lang/rust/pull/54057/
364 [54240]: https://github.com/rust-lang/rust/pull/54240/
365 [54430]: https://github.com/rust-lang/rust/pull/54430/
366 [54451]: https://github.com/rust-lang/rust/pull/54451/
367 [54497]: https://github.com/rust-lang/rust/pull/54497/
368 [54778]: https://github.com/rust-lang/rust/pull/54778/
369 [54835]: https://github.com/rust-lang/rust/pull/54835/
370 [54870]: https://github.com/rust-lang/rust/pull/54870/
371 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
372 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
373 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
374 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
375 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
376 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
377 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
378 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
379 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
380 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
381 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
382 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
383 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
384 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
386 Version 1.30.1 (2018-11-08)
387 ===========================
389 - [Fixed overflow ICE in rustdoc][54199]
390 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
392 [54199]: https://github.com/rust-lang/rust/pull/54199
393 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
395 Version 1.30.0 (2018-10-25)
396 ==========================
400 - [Procedural macros are now available.][52081] These kinds of macros allow for
401 more powerful code generation. There is a [new chapter available][proc-macros]
402 in the Rust Programming Language book that goes further in depth.
403 - [You can now use keywords as identifiers using the raw identifiers
404 syntax (`r#`),][53236] e.g. `let r#for = true;`
405 - [Using anonymous parameters in traits is now deprecated with a warning and
406 will be a hard error in the 2018 edition.][53272]
407 - [You can now use `crate` in paths.][54404] This allows you to refer to the
408 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
409 - [Using a external crate no longer requires being prefixed with `::`.][54404]
410 Previously, using a external crate in a module without a use statement
411 required `let json = ::serde_json::from_str(foo);` but can now be written
412 as `let json = serde_json::from_str(foo);`.
413 - [You can now apply the `#[used]` attribute to static items to prevent the
414 compiler from optimising them away, even if they appear to be unused,][51363]
415 e.g. `#[used] static FOO: u32 = 1;`
416 - [You can now import and reexport macros from other crates with the `use`
417 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
418 the root module of the crate. If your macro relies on calling other local
419 macros, it is recommended to export with the
420 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
422 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
423 using the `vis` specifier.][53370]
424 - [Non-macro attributes now allow all forms of literals, not just
425 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
426 write `#[attr(true)]`.
427 - [You can now specify a function to handle a panic in the Rust runtime with the
428 `#[panic_handler]` attribute.][51366]
432 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
433 - [Added the `aarch64-unknown-netbsd` target][53165]
437 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
441 - [`Ipv4Addr::BROADCAST`]
442 - [`Ipv4Addr::LOCALHOST`]
443 - [`Ipv4Addr::UNSPECIFIED`]
444 - [`Ipv6Addr::LOCALHOST`]
445 - [`Ipv6Addr::UNSPECIFIED`]
446 - [`Iterator::find_map`]
448 The following methods are replacement methods for `trim_left`, `trim_right`,
449 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
451 - [`str::trim_end_matches`]
453 - [`str::trim_start_matches`]
454 - [`str::trim_start`]
458 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
459 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
460 equivalent to calling `rustdoc --error-format=json`.
461 - [Cargo will now provide a progress bar for builds.][cargo/5995]
465 - [`rustdoc` allows you to specify what edition to treat your code as with the
466 `--edition` option.][54057]
467 - [`rustdoc` now has the `--color` (specify whether to output color) and
468 `--error-format` (specify error format, e.g. `json`) options.][53003]
469 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
470 debug symbols.][53774]
471 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
472 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
474 [50911]: https://github.com/rust-lang/rust/pull/50911/
475 [51363]: https://github.com/rust-lang/rust/pull/51363/
476 [51366]: https://github.com/rust-lang/rust/pull/51366/
477 [52081]: https://github.com/rust-lang/rust/pull/52081/
478 [53003]: https://github.com/rust-lang/rust/pull/53003/
479 [53033]: https://github.com/rust-lang/rust/pull/53033/
480 [53044]: https://github.com/rust-lang/rust/pull/53044/
481 [53165]: https://github.com/rust-lang/rust/pull/53165/
482 [53213]: https://github.com/rust-lang/rust/pull/53213/
483 [53236]: https://github.com/rust-lang/rust/pull/53236/
484 [53272]: https://github.com/rust-lang/rust/pull/53272/
485 [53370]: https://github.com/rust-lang/rust/pull/53370/
486 [53459]: https://github.com/rust-lang/rust/pull/53459/
487 [53774]: https://github.com/rust-lang/rust/pull/53774/
488 [53822]: https://github.com/rust-lang/rust/pull/53822/
489 [54057]: https://github.com/rust-lang/rust/pull/54057/
490 [54146]: https://github.com/rust-lang/rust/pull/54146/
491 [54404]: https://github.com/rust-lang/rust/pull/54404/
492 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
493 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
494 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
495 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
497 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
498 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
499 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
500 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
501 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
502 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
503 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
504 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
505 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
506 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
509 Version 1.29.2 (2018-10-11)
510 ===========================
512 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
513 - The `rls-preview` component on the windows-gnu targets has been restored.
515 [54639]: https://github.com/rust-lang/rust/pull/54639
518 Version 1.29.1 (2018-09-25)
519 ===========================
524 - The standard library's `str::repeat` function contained an out of bounds write
525 caused by an integer overflow. This has been fixed by deterministically
526 panicking when an overflow happens.
528 Thank you to Scott McMurray for responsibily disclosing this vulnerability to
532 Version 1.29.0 (2018-09-13)
533 ==========================
537 - [Bumped minimum LLVM version to 5.0.][51899]
538 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
539 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
543 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
544 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
545 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
546 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
548 - [`Cell<T>` now allows `T` to be unsized.][50494]
549 - [`SocketAddr` is now stable on Redox.][52656]
554 - [`Iterator::flatten`]
559 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
560 `--locked` to disable this behavior.
561 - [`cargo-install` will now allow you to cross compile an install
562 using `--target`.][cargo/5614]
563 - [Added the `cargo-fix` subcommand to automatically move project code from
564 2015 edition to 2018.][cargo/5723]
565 - [`cargo doc` can now optionally document private types using the
566 `--document-private-items` flag.][cargo/5543]
570 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
571 the specified level to that level.][52354] For example `--cap-lints warn`
572 will demote `deny` and `forbid` lints to `warn`.
573 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
574 fails and `101` if there is a panic.][52197]
575 - [A preview of clippy has been made available through rustup.][51122]
576 You can install the preview with `rustup component add clippy-preview`.
580 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
581 Use `str::get_unchecked(begin..end)` instead.
582 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
583 Consider using the `home_dir` function from
584 https://crates.io/crates/dirs instead.
585 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
586 - [`cfg` attributes and `--cfg` command line flags are now more
587 strictly validated.][53893]
589 [53893]: https://github.com/rust-lang/rust/pull/53893/
590 [52861]: https://github.com/rust-lang/rust/pull/52861/
591 [52656]: https://github.com/rust-lang/rust/pull/52656/
592 [52239]: https://github.com/rust-lang/rust/pull/52239/
593 [52330]: https://github.com/rust-lang/rust/pull/52330/
594 [52354]: https://github.com/rust-lang/rust/pull/52354/
595 [52402]: https://github.com/rust-lang/rust/pull/52402/
596 [52103]: https://github.com/rust-lang/rust/pull/52103/
597 [52197]: https://github.com/rust-lang/rust/pull/52197/
598 [51807]: https://github.com/rust-lang/rust/pull/51807/
599 [51899]: https://github.com/rust-lang/rust/pull/51899/
600 [51912]: https://github.com/rust-lang/rust/pull/51912/
601 [51511]: https://github.com/rust-lang/rust/pull/51511/
602 [51619]: https://github.com/rust-lang/rust/pull/51619/
603 [51656]: https://github.com/rust-lang/rust/pull/51656/
604 [51178]: https://github.com/rust-lang/rust/pull/51178/
605 [51122]: https://github.com/rust-lang/rust/pull/51122
606 [50494]: https://github.com/rust-lang/rust/pull/50494/
607 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
608 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
609 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
610 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
611 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
612 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
613 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
616 Version 1.28.0 (2018-08-02)
617 ===========================
621 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
622 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
623 the inner type across Foreign Function Interface (FFI) boundaries.
624 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
625 and can now be used as identifiers.][51196]
626 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
627 stable.][51241] This will allow users to specify a global allocator for
629 - [Unit test functions marked with the `#[test]` attribute can now return
630 `Result<(), E: Debug>` in addition to `()`.][51298]
631 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
632 allows macros to easily target lifetimes.
636 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
637 prioritise making smaller binary sizes. `z` is the same as `s` with the
638 exception that it does not vectorise loops, which typically results in an even
640 - [The short error format is now stable.][49546] Specified with
641 `--error-format=short` this option will provide a more compressed output of
643 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
644 - [Reduced the number of allocations in the macro parser.][50855] This can
645 improve compile times of macro heavy crates on average by 5%.
649 - [Implemented `Default` for `&mut str`.][51306]
650 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
651 - [Implemented `Extend` for `()`.][50234]
652 - [The `Debug` implementation of `time::Duration` should now be more easily
653 human readable.][50364] Previously a `Duration` of one second would printed as
654 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
655 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
656 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
657 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
658 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
659 for `PathBuf`.][50170]
660 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
661 and `Wrapping<i128>`.][50465]
662 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
663 possible.][51050] This can provide up to a 40% speed increase.
664 - [Improved error messages when using `format!`.][50610]
668 - [`Iterator::step_by`]
669 - [`Path::ancestors`]
670 - [`SystemTime::UNIX_EPOCH`]
671 - [`alloc::GlobalAlloc`]
673 - [`alloc::LayoutErr`]
676 - [`alloc::alloc_zeroed`]
679 - [`alloc::handle_alloc_error`]
680 - [`btree_map::Entry::or_default`]
682 - [`hash_map::Entry::or_default`]
683 - [`iter::repeat_with`]
684 - [`num::NonZeroUsize`]
685 - [`num::NonZeroU128`]
686 - [`num::NonZeroU16`]
687 - [`num::NonZeroU32`]
688 - [`num::NonZeroU64`]
690 - [`ops::RangeBounds`]
691 - [`slice::SliceIndex`]
692 - [`slice::from_mut`]
693 - [`slice::from_ref`]
694 - [`{Any + Send + Sync}::downcast_mut`]
695 - [`{Any + Send + Sync}::downcast_ref`]
696 - [`{Any + Send + Sync}::is`]
700 - [Cargo will now no longer allow you to publish crates with build scripts that
701 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
702 considered to be immutable.
706 - [The `suggestion_applicability` field in `rustc`'s json output is now
707 stable.][50486] This will allow dev tools to check whether a code suggestion
712 - [Rust will consider trait objects with duplicated constraints to be the same
713 type as without the duplicated constraint.][51276] For example the below code will
719 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
722 impl Trait + Send + Send {
723 fn test(&self) { println!("two"); }
727 [49546]: https://github.com/rust-lang/rust/pull/49546/
728 [50143]: https://github.com/rust-lang/rust/pull/50143/
729 [50170]: https://github.com/rust-lang/rust/pull/50170/
730 [50234]: https://github.com/rust-lang/rust/pull/50234/
731 [50265]: https://github.com/rust-lang/rust/pull/50265/
732 [50364]: https://github.com/rust-lang/rust/pull/50364/
733 [50385]: https://github.com/rust-lang/rust/pull/50385/
734 [50465]: https://github.com/rust-lang/rust/pull/50465/
735 [50486]: https://github.com/rust-lang/rust/pull/50486/
736 [50554]: https://github.com/rust-lang/rust/pull/50554/
737 [50610]: https://github.com/rust-lang/rust/pull/50610/
738 [50855]: https://github.com/rust-lang/rust/pull/50855/
739 [51050]: https://github.com/rust-lang/rust/pull/51050/
740 [51196]: https://github.com/rust-lang/rust/pull/51196/
741 [51200]: https://github.com/rust-lang/rust/pull/51200/
742 [51241]: https://github.com/rust-lang/rust/pull/51241/
743 [51276]: https://github.com/rust-lang/rust/pull/51276/
744 [51298]: https://github.com/rust-lang/rust/pull/51298/
745 [51306]: https://github.com/rust-lang/rust/pull/51306/
746 [51562]: https://github.com/rust-lang/rust/pull/51562/
747 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
748 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
749 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
750 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
751 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
752 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
753 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
754 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
755 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
756 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
757 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
758 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
759 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
760 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
761 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
762 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
763 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
764 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
765 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
766 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
767 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
768 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
769 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
770 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
771 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
772 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
773 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
774 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
775 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
776 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
778 Version 1.27.2 (2018-07-20)
779 ===========================
784 - The borrow checker was fixed to avoid potential unsoundness when using
785 match ergonomics: [#52213][52213].
787 [52213]: https://github.com/rust-lang/rust/issues/52213
789 Version 1.27.1 (2018-07-10)
790 ===========================
795 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
796 when running, which enabled executing code as some other user on a
797 given machine. This release fixes that vulnerability; you can read
798 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
800 Thank you to Red Hat for responsibily disclosing this vulnerability to us.
805 - The borrow checker was fixed to avoid an additional potential unsoundness when using
806 match ergonomics: [#51415][51415], [#49534][49534].
808 [51415]: https://github.com/rust-lang/rust/issues/51415
809 [49534]: https://github.com/rust-lang/rust/issues/49534
810 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
811 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
813 Version 1.27.0 (2018-06-21)
814 ==========================
818 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
819 be used as an identifier.
820 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
821 bare `Trait` syntax, and should make it clearer when being used in tandem with
822 `impl Trait` because it is equivalent to the following syntax:
823 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
824 `Box<Trait> == Box<dyn Trait>`.
825 - [Attributes on generic parameters such as types and lifetimes are
826 now stable.][48851] e.g.
827 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
828 - [The `#[must_use]` attribute can now also be used on functions as well as
829 types.][48925] It provides a lint that by default warns users when the
830 value returned by a function has not been used.
834 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
838 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
839 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
840 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
841 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
843 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
844 std are now available in core.][49896]
845 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
847 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
848 that the operation isn't done in place.
849 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
850 the `#[must_use]` attribute][49533] to warn about unused potentially
851 expensive allocations.
855 - [`DoubleEndedIterator::rfind`]
856 - [`DoubleEndedIterator::rfold`]
857 - [`DoubleEndedIterator::try_rfold`]
858 - [`Duration::from_micros`]
859 - [`Duration::from_nanos`]
860 - [`Duration::subsec_micros`]
861 - [`Duration::subsec_millis`]
862 - [`HashMap::remove_entry`]
863 - [`Iterator::try_fold`]
864 - [`Iterator::try_for_each`]
867 - [`String::replace_range`]
868 - [`Take::set_limit`]
869 - [`hint::unreachable_unchecked`]
870 - [`os::unix::process::parent_id`]
871 - [`ptr::swap_nonoverlapping`]
872 - [`slice::rsplit_mut`]
874 - [`slice::swap_with_slice`]
878 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
879 `readme`, and `repository` fields.][cargo/5386]
880 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
881 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
882 a different directory than `target` for placing compilation artifacts.
883 - [Cargo will be adding automatic target inference for binaries, benchmarks,
884 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
885 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
886 where cargo would infer a binary, Cargo will produce a warning. You can
887 disable this feature ahead of time by setting any of the following to false:
888 `autobins`, `autobenches`, `autoexamples`, `autotests`.
889 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
890 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
894 - [Added “The Rustc book” into the official documentation.][49707]
895 [“The Rustc book”] documents and teaches how to use the rustc compiler.
896 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
900 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
901 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
902 compile, `"".is_empty()` will still compile.
903 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
904 will only print the inner type.][48553] E.g.
905 `print!("{:?}", AtomicBool::new(true))` will print `true`,
906 not `AtomicBool(true)`.
907 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
908 could enter higher numbers but they were not supported by LLVM. Up to 512MB
909 alignment should cover all use cases.
910 - The `.description()` method on the `std::error::Error` trait
911 [has been soft-deprecated][50163]. It is no longer required to implement it.
913 [48553]: https://github.com/rust-lang/rust/pull/48553/
914 [48851]: https://github.com/rust-lang/rust/pull/48851/
915 [48925]: https://github.com/rust-lang/rust/pull/48925/
916 [49533]: https://github.com/rust-lang/rust/pull/49533/
917 [49623]: https://github.com/rust-lang/rust/pull/49623/
918 [49630]: https://github.com/rust-lang/rust/pull/49630/
919 [49664]: https://github.com/rust-lang/rust/pull/49664/
920 [49699]: https://github.com/rust-lang/rust/pull/49699/
921 [49707]: https://github.com/rust-lang/rust/pull/49707/
922 [49719]: https://github.com/rust-lang/rust/pull/49719/
923 [49896]: https://github.com/rust-lang/rust/pull/49896/
924 [49968]: https://github.com/rust-lang/rust/pull/49968/
925 [50163]: https://github.com/rust-lang/rust/pull/50163
926 [50177]: https://github.com/rust-lang/rust/pull/50177/
927 [50378]: https://github.com/rust-lang/rust/pull/50378/
928 [50398]: https://github.com/rust-lang/rust/pull/50398/
929 [50423]: https://github.com/rust-lang/rust/pull/50423/
930 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
931 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
932 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
933 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
934 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
935 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
936 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
937 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
938 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
939 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
940 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
941 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
942 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
943 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
944 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
945 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
946 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
947 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
948 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
949 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
950 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
951 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
952 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
953 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
954 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
955 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
956 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
957 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
958 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
959 [“The Rustc book”]: https://doc.rust-lang.org/rustc
962 Version 1.26.2 (2018-06-05)
963 ==========================
968 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
970 [51117]: https://github.com/rust-lang/rust/issues/51117
973 Version 1.26.1 (2018-05-29)
974 ==========================
979 - [RLS now works on Windows.][50646]
980 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
986 - [`fn main() -> impl Trait` no longer works for non-Termination
988 This reverts an accidental stabilization.
989 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
990 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
992 [50646]: https://github.com/rust-lang/rust/issues/50646
993 [50656]: https://github.com/rust-lang/rust/pull/50656
994 [50812]: https://github.com/rust-lang/rust/pull/50812
995 [50950]: https://github.com/rust-lang/rust/issues/50950
996 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
998 Version 1.26.0 (2018-05-10)
999 ==========================
1003 - [Closures now implement `Copy` and/or `Clone` if all captured variables
1004 implement either or both traits.][49299]
1005 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
1006 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
1007 lifetime can be elided.][49458]
1008 - [`impl Trait` is now stable allowing you to have abstract types in returns
1009 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
1010 `fn open(path: impl AsRef<Path>)`.
1011 - [Pattern matching will now automatically apply dereferences.][49394]
1012 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
1013 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
1014 - [A lot of operations are now available in a const context.][46882] E.g. You
1015 can now index into constant arrays, reference and dereference into constants,
1016 and use tuple struct constructors.
1017 - [Fixed entry slice patterns are now stable.][48516] E.g.
1019 let points = [1, 2, 3, 4];
1021 [1, 2, 3, 4] => println!("All points were sequential."),
1022 _ => println!("Not all points were sequential."),
1029 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
1030 - [Fixed exponential projection complexity on nested types.][48296]
1031 This can provide up to a ~12% reduction in compile times for certain crates.
1032 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
1033 to remap path prefixes outputted by the compiler.
1034 - [Added `powerpc-unknown-netbsd` target.][48281]
1038 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
1039 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
1040 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
1041 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
1042 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
1043 - [`ascii::escape_default` is now available in libcore.][48735]
1044 - [Trailing commas are now supported in std and core macros.][48056]
1045 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
1046 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
1051 - [`*const T::copy_to_nonoverlapping`]
1052 - [`*const T::copy_to`]
1053 - [`*const T::read_unaligned`]
1054 - [`*const T::read_volatile`]
1055 - [`*const T::read`]
1057 - [`*const T::wrapping_add`]
1058 - [`*const T::wrapping_sub`]
1060 - [`*mut T::copy_to_nonoverlapping`]
1061 - [`*mut T::copy_to`]
1062 - [`*mut T::read_unaligned`]
1063 - [`*mut T::read_volatile`]
1065 - [`*mut T::replace`]
1068 - [`*mut T::wrapping_add`]
1069 - [`*mut T::wrapping_sub`]
1070 - [`*mut T::write_bytes`]
1071 - [`*mut T::write_unaligned`]
1072 - [`*mut T::write_volatile`]
1075 - [`FromUtf8Error::as_bytes`]
1076 - [`LocalKey::try_with`]
1077 - [`Option::cloned`]
1078 - [`btree_map::Entry::and_modify`]
1079 - [`fs::read_to_string`]
1082 - [`hash_map::Entry::and_modify`]
1083 - [`iter::FusedIterator`]
1084 - [`ops::RangeInclusive`]
1085 - [`ops::RangeToInclusive`]
1087 - [`slice::rotate_left`]
1088 - [`slice::rotate_right`]
1089 - [`String::retain`]
1094 - [Cargo will now output path to custom commands when `-v` is
1095 passed with `--list`][cargo/5041]
1096 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
1100 - [The second edition of "The Rust Programming Language" book is now recommended
1101 over the first.][48404]
1106 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
1107 syntax is now invalid.
1109 use std::ops::Fn as dyn;
1110 fn g(_: Box<dyn(std::fmt::Debug)>) {}
1112 - [The result of dereferences are no longer promoted to `'static`.][47408]
1116 const PAIR: &(i32, i32) = &(0, 1);
1117 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
1120 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
1121 - [`".e0"` will now no longer parse as `0.0` and will instead cause
1123 - [Removed hoedown from rustdoc.][48274]
1124 - [Bounds on higher-kinded lifetimes a hard error.][48326]
1126 [46882]: https://github.com/rust-lang/rust/pull/46882
1127 [47379]: https://github.com/rust-lang/rust/pull/47379
1128 [47408]: https://github.com/rust-lang/rust/pull/47408
1129 [47813]: https://github.com/rust-lang/rust/pull/47813
1130 [48056]: https://github.com/rust-lang/rust/pull/48056
1131 [48125]: https://github.com/rust-lang/rust/pull/48125
1132 [48166]: https://github.com/rust-lang/rust/pull/48166
1133 [48235]: https://github.com/rust-lang/rust/pull/48235
1134 [48274]: https://github.com/rust-lang/rust/pull/48274
1135 [48281]: https://github.com/rust-lang/rust/pull/48281
1136 [48296]: https://github.com/rust-lang/rust/pull/48296
1137 [48326]: https://github.com/rust-lang/rust/pull/48326
1138 [48359]: https://github.com/rust-lang/rust/pull/48359
1139 [48404]: https://github.com/rust-lang/rust/pull/48404
1140 [48481]: https://github.com/rust-lang/rust/pull/48481
1141 [48516]: https://github.com/rust-lang/rust/pull/48516
1142 [48628]: https://github.com/rust-lang/rust/pull/48628
1143 [48629]: https://github.com/rust-lang/rust/pull/48629
1144 [48657]: https://github.com/rust-lang/rust/pull/48657
1145 [48735]: https://github.com/rust-lang/rust/pull/48735
1146 [48978]: https://github.com/rust-lang/rust/pull/48978
1147 [49101]: https://github.com/rust-lang/rust/pull/49101
1148 [49109]: https://github.com/rust-lang/rust/pull/49109
1149 [49121]: https://github.com/rust-lang/rust/pull/49121
1150 [49162]: https://github.com/rust-lang/rust/pull/49162
1151 [49184]: https://github.com/rust-lang/rust/pull/49184
1152 [49234]: https://github.com/rust-lang/rust/pull/49234
1153 [49255]: https://github.com/rust-lang/rust/pull/49255
1154 [49299]: https://github.com/rust-lang/rust/pull/49299
1155 [49305]: https://github.com/rust-lang/rust/pull/49305
1156 [49394]: https://github.com/rust-lang/rust/pull/49394
1157 [49458]: https://github.com/rust-lang/rust/pull/49458
1158 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
1159 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
1160 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
1161 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
1162 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
1163 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
1164 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
1165 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
1166 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
1167 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
1168 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
1169 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
1170 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
1171 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
1172 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
1173 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
1174 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
1175 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
1176 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
1177 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
1178 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
1179 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
1180 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
1181 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
1182 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
1183 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
1184 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
1185 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
1186 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
1187 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
1188 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
1189 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
1190 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
1191 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
1192 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
1193 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
1194 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
1195 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
1196 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
1197 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
1198 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
1199 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
1202 Version 1.25.0 (2018-03-29)
1203 ==========================
1207 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
1208 - [You can now use nested groups of imports.][47948]
1209 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
1210 - [You can now have `|` at the start of a match arm.][47947] e.g.
1212 enum Foo { A, B, C }
1218 | Foo::B => println!("AB"),
1219 | Foo::C => println!("C"),
1226 - [Upgraded to LLVM 6.][47828]
1227 - [Added `-C lto=val` option.][47521]
1228 - [Added `i586-unknown-linux-musl` target][47282]
1232 - [Impl Send for `process::Command` on Unix.][47760]
1233 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
1234 - [`UnsafeCell::into_inner` is now safe.][47204]
1235 - [Implement libstd for CloudABI.][47268]
1236 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
1237 - [Implement `AsRef<Path>` for Component][46985]
1238 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
1239 - [Moved `Duration` to libcore.][46666]
1243 - [`Location::column`]
1246 The following functions can now be used in a constant expression.
1247 eg. `static MINUTE: Duration = Duration::from_secs(60);`
1248 - [`Duration::new`][47300]
1249 - [`Duration::from_secs`][47300]
1250 - [`Duration::from_millis`][47300]
1254 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
1255 - [`cargo new` now defaults to creating a binary crate, instead of a
1256 library crate.][cargo/5029]
1260 - [Rust by example is now shipped with new releases][46196]
1264 - [Deprecated `net::lookup_host`.][47510]
1265 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
1266 - The borrow checker was sometimes incorrectly permitting overlapping borrows
1267 around indexing operations (see [#47349][47349]). This has been fixed (which also
1268 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
1269 - [Removed deprecated unstable attribute `#[simd]`.][47251]
1271 [33903]: https://github.com/rust-lang/rust/pull/33903
1272 [47947]: https://github.com/rust-lang/rust/pull/47947
1273 [47948]: https://github.com/rust-lang/rust/pull/47948
1274 [47760]: https://github.com/rust-lang/rust/pull/47760
1275 [47790]: https://github.com/rust-lang/rust/pull/47790
1276 [47828]: https://github.com/rust-lang/rust/pull/47828
1277 [47398]: https://github.com/rust-lang/rust/pull/47398
1278 [47510]: https://github.com/rust-lang/rust/pull/47510
1279 [47521]: https://github.com/rust-lang/rust/pull/47521
1280 [47204]: https://github.com/rust-lang/rust/pull/47204
1281 [47251]: https://github.com/rust-lang/rust/pull/47251
1282 [47268]: https://github.com/rust-lang/rust/pull/47268
1283 [47282]: https://github.com/rust-lang/rust/pull/47282
1284 [47300]: https://github.com/rust-lang/rust/pull/47300
1285 [47349]: https://github.com/rust-lang/rust/pull/47349
1286 [46931]: https://github.com/rust-lang/rust/pull/46931
1287 [46985]: https://github.com/rust-lang/rust/pull/46985
1288 [47006]: https://github.com/rust-lang/rust/pull/47006
1289 [46830]: https://github.com/rust-lang/rust/pull/46830
1290 [46095]: https://github.com/rust-lang/rust/pull/46095
1291 [46666]: https://github.com/rust-lang/rust/pull/46666
1292 [46196]: https://github.com/rust-lang/rust/pull/46196
1293 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
1294 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
1295 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
1296 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
1297 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
1300 Version 1.24.1 (2018-03-01)
1301 ==========================
1303 - [Do not abort when unwinding through FFI][48251]
1304 - [Emit UTF-16 files for linker arguments on Windows][48318]
1305 - [Make the error index generator work again][48308]
1306 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
1308 [48251]: https://github.com/rust-lang/rust/issues/48251
1309 [48308]: https://github.com/rust-lang/rust/issues/48308
1310 [48318]: https://github.com/rust-lang/rust/issues/48318
1311 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
1314 Version 1.24.0 (2018-02-15)
1315 ==========================
1319 - [External `sysv64` ffi is now available.][46528]
1320 eg. `extern "sysv64" fn foo () {}`
1324 - [rustc now uses 16 codegen units by default for release builds.][46910]
1325 For the fastest builds, utilize `codegen-units=1`.
1326 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
1327 - [Add `aarch64-unknown-openbsd` support][46760]
1331 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
1332 improvement in performance in the majority of cases.
1333 - [`OsStr`'s `Debug` implementation is now lossless and consistent
1334 with Windows.][46798]
1335 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
1336 - [impl `From<bool>` for `AtomicBool`][46293]
1337 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
1338 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
1339 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
1340 - [float::from_bits now just uses transmute.][46012] This provides
1341 some optimisations from LLVM.
1342 - [Copied `AsciiExt` methods onto `char`][46077]
1343 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
1344 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
1345 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
1346 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
1350 - [`RefCell::replace`]
1352 - [`atomic::spin_loop_hint`]
1354 The following functions can now be used in a constant expression.
1355 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
1357 - [`AtomicBool::new`][46287]
1358 - [`AtomicUsize::new`][46287]
1359 - [`AtomicIsize::new`][46287]
1360 - [`AtomicPtr::new`][46287]
1361 - [`Cell::new`][46287]
1362 - [`{integer}::min_value`][46287]
1363 - [`{integer}::max_value`][46287]
1364 - [`mem::size_of`][46287]
1365 - [`mem::align_of`][46287]
1366 - [`ptr::null`][46287]
1367 - [`ptr::null_mut`][46287]
1368 - [`RefCell::new`][46287]
1369 - [`UnsafeCell::new`][46287]
1373 - [Added a `workspace.default-members` config that
1374 overrides implied `--all` in virtual workspaces.][cargo/4743]
1375 - [Enable incremental by default on development builds.][cargo/4817] Also added
1376 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
1377 per-project or global basis respectively.
1384 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
1385 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
1386 in accordance with IETF RFC 4291 §2.2.
1387 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
1388 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
1389 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
1390 - [Leading zeros in tuple struct members is now an error][47084]
1391 - [`column!()` macro is one-based instead of zero-based][46977]
1392 - [`fmt::Arguments` can no longer be shared across threads][45198]
1393 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
1394 - [Cargo sets a different working directory for the compiler][cargo/4788]
1396 [44884]: https://github.com/rust-lang/rust/pull/44884
1397 [45198]: https://github.com/rust-lang/rust/pull/45198
1398 [45506]: https://github.com/rust-lang/rust/pull/45506
1399 [45904]: https://github.com/rust-lang/rust/pull/45904
1400 [45990]: https://github.com/rust-lang/rust/pull/45990
1401 [46012]: https://github.com/rust-lang/rust/pull/46012
1402 [46077]: https://github.com/rust-lang/rust/pull/46077
1403 [46094]: https://github.com/rust-lang/rust/pull/46094
1404 [46284]: https://github.com/rust-lang/rust/pull/46284
1405 [46287]: https://github.com/rust-lang/rust/pull/46287
1406 [46293]: https://github.com/rust-lang/rust/pull/46293
1407 [46528]: https://github.com/rust-lang/rust/pull/46528
1408 [46671]: https://github.com/rust-lang/rust/pull/46671
1409 [46713]: https://github.com/rust-lang/rust/pull/46713
1410 [46735]: https://github.com/rust-lang/rust/pull/46735
1411 [46749]: https://github.com/rust-lang/rust/pull/46749
1412 [46760]: https://github.com/rust-lang/rust/pull/46760
1413 [46798]: https://github.com/rust-lang/rust/pull/46798
1414 [46828]: https://github.com/rust-lang/rust/pull/46828
1415 [46831]: https://github.com/rust-lang/rust/pull/46831
1416 [46833]: https://github.com/rust-lang/rust/pull/46833
1417 [46910]: https://github.com/rust-lang/rust/pull/46910
1418 [46977]: https://github.com/rust-lang/rust/pull/46977
1419 [47018]: https://github.com/rust-lang/rust/pull/47018
1420 [47080]: https://github.com/rust-lang/rust/pull/47080
1421 [47084]: https://github.com/rust-lang/rust/pull/47084
1422 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
1423 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
1424 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
1425 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
1426 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
1427 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
1430 Version 1.23.0 (2018-01-04)
1431 ==========================
1435 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
1436 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
1437 Which should fix some confusing errors in some operations.
1441 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
1442 undefined behavior.][45920]
1443 - [rustc now suggests renaming import if names clash.][45660]
1444 - [Display errors/warnings correctly when there are zero-width or
1445 wide characters.][45711]
1446 - [rustc now avoids unnecessary copies of arguments that are
1447 simple bindings][45380] This should improve memory usage on average by 5-10%.
1448 - [Updated musl used to build musl rustc to 1.1.17][45393]
1452 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
1453 - [Implement Hash for raw pointers to unsized types][45483]
1454 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
1455 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
1456 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
1457 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
1458 and `<*mut T>::as_mut`][44932]
1459 - [Optimized `Thread::{park, unpark}` implementation][45524]
1460 - [Improved `SliceExt::binary_search` performance.][45333]
1461 - [impl `FromIterator<()>` for `()`][45379]
1462 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
1470 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
1471 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
1472 - [Added unit test checking to `cargo check`][cargo/4592]
1473 - [Cargo now lets you install a specific version
1474 using `cargo install --version`][cargo/4637]
1478 - [Releases now ship with the Cargo book documentation.][45692]
1479 - [rustdoc now prints rendering warnings on every run.][45324]
1483 - [Changes have been made to type equality to make it more correct,
1484 in rare cases this could break some code.][45853] [Tracking issue for
1485 further information][45852]
1486 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
1487 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
1488 Android 9, the minimum supported version is Android 14.
1489 - [Bumped the minimum LLVM to 3.9][45326]
1491 [44042]: https://github.com/rust-lang/rust/pull/44042
1492 [44932]: https://github.com/rust-lang/rust/pull/44932
1493 [45267]: https://github.com/rust-lang/rust/pull/45267
1494 [45324]: https://github.com/rust-lang/rust/pull/45324
1495 [45326]: https://github.com/rust-lang/rust/pull/45326
1496 [45333]: https://github.com/rust-lang/rust/pull/45333
1497 [45379]: https://github.com/rust-lang/rust/pull/45379
1498 [45380]: https://github.com/rust-lang/rust/pull/45380
1499 [45393]: https://github.com/rust-lang/rust/pull/45393
1500 [45435]: https://github.com/rust-lang/rust/pull/45435
1501 [45483]: https://github.com/rust-lang/rust/pull/45483
1502 [45524]: https://github.com/rust-lang/rust/pull/45524
1503 [45571]: https://github.com/rust-lang/rust/pull/45571
1504 [45580]: https://github.com/rust-lang/rust/pull/45580
1505 [45610]: https://github.com/rust-lang/rust/pull/45610
1506 [45660]: https://github.com/rust-lang/rust/pull/45660
1507 [45692]: https://github.com/rust-lang/rust/pull/45692
1508 [45711]: https://github.com/rust-lang/rust/pull/45711
1509 [45772]: https://github.com/rust-lang/rust/pull/45772
1510 [45852]: https://github.com/rust-lang/rust/issues/45852
1511 [45853]: https://github.com/rust-lang/rust/pull/45853
1512 [45887]: https://github.com/rust-lang/rust/pull/45887
1513 [45920]: https://github.com/rust-lang/rust/pull/45920
1514 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
1515 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
1516 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
1519 Version 1.22.1 (2017-11-22)
1520 ==========================
1522 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
1524 [46183]: https://github.com/rust-lang/rust/pull/46183
1526 Version 1.22.0 (2017-11-22)
1527 ==========================
1531 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
1532 - [Now accepts underscores in unicode escapes][43716]
1533 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
1534 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
1538 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
1539 - [rustc will no longer inline in codegen units when compiling for debug][45075]
1540 This should decrease compile times for debug builds.
1541 - [strict memory alignment now enabled on ARMv6][45094]
1542 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
1546 - [Allow atomic operations up to 32 bits
1547 on `armv5te_unknown_linux_gnueabi`][44978]
1548 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
1549 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
1550 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
1551 - [Properly detect overflow in `Instant += Duration`.][44220]
1552 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
1553 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
1554 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
1561 - [Cargo will now build multi file examples in subdirectories of the `examples`
1562 folder that have a `main.rs` file.][cargo/4496]
1563 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
1564 the old format will continue to work and can be updated with `cargo update`.
1565 - [Now supports vendoring git repositories][cargo/3992]
1569 - [`libbacktrace` is now available on Apple platforms.][44251]
1570 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
1571 This now lets you specify that a given code example will fail to compile.
1575 - [The minimum Android version that rustc can build for has been bumped
1576 to `4.0` from `2.3`][45656]
1577 - [Allowing `T op= &T` for numeric types has broken some type
1578 inference cases][45480]
1581 [42526]: https://github.com/rust-lang/rust/pull/42526
1582 [43017]: https://github.com/rust-lang/rust/pull/43017
1583 [43716]: https://github.com/rust-lang/rust/pull/43716
1584 [43949]: https://github.com/rust-lang/rust/pull/43949
1585 [44015]: https://github.com/rust-lang/rust/pull/44015
1586 [44220]: https://github.com/rust-lang/rust/pull/44220
1587 [44251]: https://github.com/rust-lang/rust/pull/44251
1588 [44287]: https://github.com/rust-lang/rust/pull/44287
1589 [44303]: https://github.com/rust-lang/rust/pull/44303
1590 [44456]: https://github.com/rust-lang/rust/pull/44456
1591 [44466]: https://github.com/rust-lang/rust/pull/44466
1592 [44895]: https://github.com/rust-lang/rust/pull/44895
1593 [44966]: https://github.com/rust-lang/rust/pull/44966
1594 [44978]: https://github.com/rust-lang/rust/pull/44978
1595 [45041]: https://github.com/rust-lang/rust/pull/45041
1596 [45064]: https://github.com/rust-lang/rust/pull/45064
1597 [45075]: https://github.com/rust-lang/rust/pull/45075
1598 [45094]: https://github.com/rust-lang/rust/pull/45094
1599 [45095]: https://github.com/rust-lang/rust/pull/45095
1600 [45480]: https://github.com/rust-lang/rust/issues/45480
1601 [45656]: https://github.com/rust-lang/rust/pull/45656
1602 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
1603 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
1604 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
1611 Version 1.21.0 (2017-10-12)
1612 ==========================
1616 - [You can now use static references for literals.][43838]
1620 let x: &'static u32 = &0;
1623 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
1626 my_macro!(Vec<i32>::new); // Always worked
1627 my_macro!(Vec::<i32>::new); // Now works
1632 - [Upgraded jemalloc to 4.5.0][43911]
1633 - [Enabled unwinding panics on Redox][43917]
1634 - [Now runs LLVM in parallel during translation phase.][43506]
1635 This should reduce peak memory usage.
1639 - [Generate builtin impls for `Clone` for all arrays and tuples that
1640 are `T: Clone`][43690]
1641 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
1642 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
1643 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
1648 [`std::mem::discriminant`]
1652 - [You can now call `cargo install` with multiple package names][cargo/4216]
1653 - [Cargo commands inside a virtual workspace will now implicitly
1654 pass `--all`][cargo/4335]
1655 - [Added a `[patch]` section to `Cargo.toml` to handle
1656 prepublication dependencies][cargo/4123] [RFC 1969]
1657 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
1658 like patterns][cargo/4270]
1659 - [Added the `--all-targets` option][cargo/4400]
1660 - [Using required dependencies as a feature is now deprecated and emits
1661 a warning][cargo/4364]
1666 - [Cargo docs are moving][43916]
1667 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
1668 - [The rustdoc book is now available][43863]
1669 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
1670 - [Added a preview of RLS has been made available through rustup][44204]
1671 Install with `rustup component add rls-preview`
1672 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
1673 Previously only showed `std::os::unix`.
1677 - [Changes in method matching against higher-ranked types][43880] This may cause
1678 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
1679 - [rustc's JSON error output's byte position start at top of file.][42973]
1680 Was previously relative to the rustc's internal `CodeMap` struct which
1681 required the unstable library `libsyntax` to correctly use.
1682 - [`unused_results` lint no longer ignores booleans][43728]
1684 [42565]: https://github.com/rust-lang/rust/pull/42565
1685 [42973]: https://github.com/rust-lang/rust/pull/42973
1686 [43348]: https://github.com/rust-lang/rust/pull/43348
1687 [43459]: https://github.com/rust-lang/rust/pull/43459
1688 [43506]: https://github.com/rust-lang/rust/pull/43506
1689 [43540]: https://github.com/rust-lang/rust/pull/43540
1690 [43690]: https://github.com/rust-lang/rust/pull/43690
1691 [43728]: https://github.com/rust-lang/rust/pull/43728
1692 [43838]: https://github.com/rust-lang/rust/pull/43838
1693 [43863]: https://github.com/rust-lang/rust/pull/43863
1694 [43880]: https://github.com/rust-lang/rust/pull/43880
1695 [43911]: https://github.com/rust-lang/rust/pull/43911
1696 [43916]: https://github.com/rust-lang/rust/pull/43916
1697 [43917]: https://github.com/rust-lang/rust/pull/43917
1698 [44204]: https://github.com/rust-lang/rust/pull/44204
1699 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
1700 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
1701 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1702 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
1703 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
1704 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
1705 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
1706 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
1707 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
1709 Version 1.20.0 (2017-08-31)
1710 ===========================
1714 - [Associated constants are now stabilised.][42809]
1715 - [A lot of macro bugs are now fixed.][42913]
1720 - [Struct fields are now properly coerced to the expected field type.][42807]
1721 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
1722 `wasm32-experimental-emscripten` target.
1723 - [Changed some of the error messages to be more helpful.][42033]
1724 - [Add support for RELRO(RELocation Read-Only) for platforms that support
1726 - [rustc now reports the total number of errors on compilation failure][43015]
1727 previously this was only the number of errors in the pass that failed.
1728 - [Expansion in rustc has been sped up 29x.][42533]
1729 - [added `msp430-none-elf` target.][43099]
1730 - [rustc will now suggest one-argument enum variant to fix type mismatch when
1732 - [Fixes backtraces on Redox][43228]
1733 - [rustc now identifies different versions of same crate when absolute paths of
1734 different types match in an error message.][42826]
1740 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
1741 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
1743 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
1744 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
1745 - [Impl `Clone` for `DefaultHasher`.][42799]
1746 - [Impl `Sync` for `SyncSender`.][42397]
1747 - [Impl `FromStr` for `char`][42271]
1748 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
1750 - [allow messages in the `unimplemented!()` macro.][42155]
1751 ie. `unimplemented!("Waiting for 1.21 to be stable")`
1752 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
1753 - [Upgrade to Unicode 10.0.0][42999]
1754 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
1755 - [Skip the main thread's manual stack guard on Linux][43072]
1756 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
1757 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
1759 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
1764 - [`CStr::into_c_string`]
1765 - [`CString::as_c_str`]
1766 - [`CString::into_boxed_c_str`]
1767 - [`Chain::get_mut`]
1768 - [`Chain::get_ref`]
1769 - [`Chain::into_inner`]
1770 - [`Option::get_or_insert_with`]
1771 - [`Option::get_or_insert`]
1772 - [`OsStr::into_os_string`]
1773 - [`OsString::into_boxed_os_str`]
1776 - [`Utf8Error::error_len`]
1777 - [`char::EscapeDebug`]
1778 - [`char::escape_debug`]
1779 - [`compile_error!`]
1780 - [`f32::from_bits`]
1782 - [`f64::from_bits`]
1784 - [`mem::ManuallyDrop`]
1785 - [`slice::sort_unstable_by_key`]
1786 - [`slice::sort_unstable_by`]
1787 - [`slice::sort_unstable`]
1788 - [`str::from_boxed_utf8_unchecked`]
1789 - [`str::as_bytes_mut`]
1790 - [`str::as_bytes_mut`]
1791 - [`str::from_utf8_mut`]
1792 - [`str::from_utf8_unchecked_mut`]
1794 - [`str::get_unchecked_mut`]
1795 - [`str::get_unchecked`]
1797 - [`str::into_boxed_bytes`]
1802 - [Cargo API token location moved from `~/.cargo/config` to
1803 `~/.cargo/credentials`.][cargo/3978]
1804 - [Cargo will now build `main.rs` binaries that are in sub-directories of
1805 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
1806 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
1807 - [You can now specify version of a binary when installed through
1808 `cargo install` using `--vers`.][cargo/4229]
1809 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
1810 failure.][cargo/4248]
1811 - [Changed the convention around which file is the crate root.][cargo/4259]
1812 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
1813 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
1818 - [Functions with `'static` in their return types will now not be as usable as
1819 if they were using lifetime parameters instead.][42417]
1820 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
1821 takes the sign of NaN into account where previously didn't.][42430]
1823 [42033]: https://github.com/rust-lang/rust/pull/42033
1824 [42155]: https://github.com/rust-lang/rust/pull/42155
1825 [42271]: https://github.com/rust-lang/rust/pull/42271
1826 [42397]: https://github.com/rust-lang/rust/pull/42397
1827 [42417]: https://github.com/rust-lang/rust/pull/42417
1828 [42430]: https://github.com/rust-lang/rust/pull/42430
1829 [42431]: https://github.com/rust-lang/rust/pull/42431
1830 [42533]: https://github.com/rust-lang/rust/pull/42533
1831 [42571]: https://github.com/rust-lang/rust/pull/42571
1832 [42613]: https://github.com/rust-lang/rust/pull/42613
1833 [42799]: https://github.com/rust-lang/rust/pull/42799
1834 [42807]: https://github.com/rust-lang/rust/pull/42807
1835 [42809]: https://github.com/rust-lang/rust/pull/42809
1836 [42822]: https://github.com/rust-lang/rust/pull/42822
1837 [42826]: https://github.com/rust-lang/rust/pull/42826
1838 [42854]: https://github.com/rust-lang/rust/pull/42854
1839 [42913]: https://github.com/rust-lang/rust/pull/42913
1840 [42999]: https://github.com/rust-lang/rust/pull/42999
1841 [43011]: https://github.com/rust-lang/rust/pull/43011
1842 [43015]: https://github.com/rust-lang/rust/pull/43015
1843 [43072]: https://github.com/rust-lang/rust/pull/43072
1844 [43077]: https://github.com/rust-lang/rust/pull/43077
1845 [43097]: https://github.com/rust-lang/rust/pull/43097
1846 [43099]: https://github.com/rust-lang/rust/pull/43099
1847 [43170]: https://github.com/rust-lang/rust/pull/43170
1848 [43178]: https://github.com/rust-lang/rust/pull/43178
1849 [43185]: https://github.com/rust-lang/rust/pull/43185
1850 [43228]: https://github.com/rust-lang/rust/pull/43228
1851 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
1852 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
1853 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
1854 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
1855 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
1856 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
1857 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
1858 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
1859 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
1860 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
1861 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
1862 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
1863 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
1864 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
1865 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
1866 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
1867 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
1868 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
1869 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
1870 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
1871 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
1872 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
1873 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
1874 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
1875 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
1876 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
1877 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
1878 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
1879 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
1880 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
1881 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
1882 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
1883 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
1884 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
1885 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
1886 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
1887 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
1888 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
1889 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
1892 Version 1.19.0 (2017-07-20)
1893 ===========================
1898 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
1899 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
1900 - [Macro recursion limit increased to 1024 from 64.][41676]
1901 - [Added lint for detecting unused macros.][41907]
1902 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
1903 For example: `let x = loop { break 7; };`
1904 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
1905 contain `Copy` types and cannot have a `Drop` implementation.
1906 Example: `union Foo { bar: u8, baz: usize }`
1907 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
1908 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
1913 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
1914 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
1915 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
1916 you should use `--target armv7-linux-androideabi`.
1917 - [Fixed ICE when removing a source file between compilation sessions.][41873]
1918 - [Minor optimisation of string operations.][42037]
1919 - [Compiler error message is now `aborting due to previous error(s)` instead of
1920 `aborting due to N previous errors`][42150] This was previously inaccurate and
1921 would only count certain kinds of errors.
1922 - [The compiler now supports Visual Studio 2017][42225]
1923 - [The compiler is now built against LLVM 4.0.1 by default][42948]
1924 - [Added a lot][42264] of [new error codes][42302]
1925 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
1926 libraries with C Run-time Libraries(CRT) to be statically linked.
1927 - [Fixed various ARM codegen bugs][42740]
1932 - [`String` now implements `FromIterator<Cow<'a, str>>` and
1933 `Extend<Cow<'a, str>>`][41449]
1934 - [`Vec` now implements `From<&mut [T]>`][41530]
1935 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
1936 - [`SplitWhitespace` now implements `Clone`][41659]
1937 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
1939 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
1940 macros, but for printing to stderr.
1945 - [`OsString::shrink_to_fit`]
1948 - [`thread::ThreadId`]
1953 - [Build scripts can now add environment variables to the environment
1954 the crate is being compiled in.
1955 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
1956 - [Subcommands now replace the current process rather than spawning a new
1957 child process][cargo/3970]
1958 - [Workspace members can now accept glob file patterns][cargo/3979]
1959 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
1960 the members in a given workspace.][cargo/3988]
1961 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
1962 - [Target directory path is now in the cargo metadata][cargo/4022]
1963 - [Cargo no longer checks out a local working directory for the
1964 crates.io index][cargo/4026] This should provide smaller file size for the
1965 registry, and improve cloning times, especially on Windows machines.
1966 - [Added an `--exclude` option for excluding certain packages when using the
1967 `--all` option][cargo/4031]
1968 - [Cargo will now automatically retry when receiving a 5xx error
1969 from crates.io][cargo/4032]
1970 - [The `--features` option now accepts multiple comma or space
1971 delimited values.][cargo/4084]
1972 - [Added support for custom target specific runners][cargo/3954]
1977 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
1979 - [Rust will now release XZ compressed packages][rust-installer/57]
1980 - [rustup will now prefer to download rust packages with
1981 XZ compression][rustup/1100] over GZip packages.
1982 - [Added the ability to escape `#` in rust documentation][41785] By adding
1983 additional `#`'s ie. `##` is now `#`
1988 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
1989 - [`-Z` flags are now no longer allowed to be used on the stable
1990 compiler.][41751] This has been a warning for a year previous to this.
1991 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
1992 longer works][42844]. Users should migrate to the built-in `check`
1993 command, which has been available since 1.16.
1994 - [Ending a float literal with `._` is now a hard error.
1995 Example: `42._` .][41946]
1996 - [Any use of a private `extern crate` outside of its module is now a
1997 hard error.][36886] This was previously a warning.
1998 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
1999 relative while the `::` prefix makes a path absolute, but was ignored and the
2000 path was relative regardless.
2001 - [Floating point constants in match patterns is now a hard error][36890]
2002 This was previously a warning.
2003 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
2004 match patterns is now a hard error][36891] This was previously a warning.
2005 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
2007 - [From the pound escape, lines consisting of multiple `#`s are
2009 - [It is an error to re-export private enum variants][42460]. This is
2010 known to break a number of crates that depend on an older version of
2012 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
2013 to use it to find the linker, and the build will fail where it did
2014 not previously][42607]
2016 [36886]: https://github.com/rust-lang/rust/issues/36886
2017 [36888]: https://github.com/rust-lang/rust/issues/36888
2018 [36890]: https://github.com/rust-lang/rust/issues/36890
2019 [36891]: https://github.com/rust-lang/rust/issues/36891
2020 [36892]: https://github.com/rust-lang/rust/issues/36892
2021 [37406]: https://github.com/rust-lang/rust/issues/37406
2022 [39983]: https://github.com/rust-lang/rust/pull/39983
2023 [41145]: https://github.com/rust-lang/rust/pull/41145
2024 [41192]: https://github.com/rust-lang/rust/pull/41192
2025 [41258]: https://github.com/rust-lang/rust/pull/41258
2026 [41370]: https://github.com/rust-lang/rust/pull/41370
2027 [41449]: https://github.com/rust-lang/rust/pull/41449
2028 [41530]: https://github.com/rust-lang/rust/pull/41530
2029 [41624]: https://github.com/rust-lang/rust/pull/41624
2030 [41656]: https://github.com/rust-lang/rust/pull/41656
2031 [41659]: https://github.com/rust-lang/rust/pull/41659
2032 [41676]: https://github.com/rust-lang/rust/pull/41676
2033 [41751]: https://github.com/rust-lang/rust/pull/41751
2034 [41764]: https://github.com/rust-lang/rust/pull/41764
2035 [41785]: https://github.com/rust-lang/rust/pull/41785
2036 [41873]: https://github.com/rust-lang/rust/pull/41873
2037 [41907]: https://github.com/rust-lang/rust/pull/41907
2038 [41946]: https://github.com/rust-lang/rust/pull/41946
2039 [42016]: https://github.com/rust-lang/rust/pull/42016
2040 [42037]: https://github.com/rust-lang/rust/pull/42037
2041 [42068]: https://github.com/rust-lang/rust/pull/42068
2042 [42150]: https://github.com/rust-lang/rust/pull/42150
2043 [42162]: https://github.com/rust-lang/rust/pull/42162
2044 [42225]: https://github.com/rust-lang/rust/pull/42225
2045 [42264]: https://github.com/rust-lang/rust/pull/42264
2046 [42302]: https://github.com/rust-lang/rust/pull/42302
2047 [42460]: https://github.com/rust-lang/rust/issues/42460
2048 [42607]: https://github.com/rust-lang/rust/issues/42607
2049 [42740]: https://github.com/rust-lang/rust/pull/42740
2050 [42844]: https://github.com/rust-lang/rust/issues/42844
2051 [42948]: https://github.com/rust-lang/rust/pull/42948
2052 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
2053 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
2054 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
2055 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
2056 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
2057 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
2058 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
2059 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
2060 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
2061 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
2062 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
2063 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
2064 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
2065 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
2066 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
2067 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
2068 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
2069 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
2070 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
2071 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
2072 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
2073 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
2076 Version 1.18.0 (2017-06-08)
2077 ===========================
2082 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
2083 make the item visible to just that module tree. Also accepts the keyword
2084 `crate` to make something public to the whole crate but not users of the
2085 library. Example: `pub(crate) mod utils;`. [RFC 1422].
2086 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
2087 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
2088 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
2089 types like `Write + Send`, trailing `+` are now supported in trait objects,
2090 and better error reporting for trait objects starting with `?Sized`.
2091 - [0e+10 is now a valid floating point literal][40589]
2092 - [Now warns if you bind a lifetime parameter to 'static][40734]
2093 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
2094 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
2095 representation in some cases.][40377]
2100 - [rustc can now emit mir with `--emit mir`][39891]
2101 - [Improved LLVM IR for trivial functions][40367]
2102 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
2103 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
2104 opportunities found through profiling
2105 - [Improved backtrace formatting when panicking][38165]
2110 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
2111 iterator hasn't been advanced the original `Vec` is reassembled with no actual
2112 iteration or reallocation.
2113 - [Simplified HashMap Bucket interface][40561] provides performance
2114 improvements for iterating and cloning.
2115 - [Specialize Vec::from_elem to use calloc][40409]
2116 - [Fixed Race condition in fs::create_dir_all][39799]
2117 - [No longer caching stdio on Windows][40516]
2118 - [Optimized insertion sort in slice][40807] insertion sort in some cases
2119 2.50%~ faster and in one case now 12.50% faster.
2120 - [Optimized `AtomicBool::fetch_nand`][41143]
2125 - [`Child::try_wait`]
2126 - [`HashMap::retain`]
2127 - [`HashSet::retain`]
2129 - [`TcpStream::peek`]
2130 - [`UdpSocket::peek`]
2131 - [`UdpSocket::peek_from`]
2136 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
2137 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
2138 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
2139 - [Added Android build support][cargo/3885]
2140 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
2141 of a certain type, for example `cargo build --bins` will build all
2143 - [Added support for haiku][cargo/3952]
2148 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
2149 - [Added rust-windbg script for better debugging on Windows][39983]
2150 - [Rust now uses the official cross compiler for NetBSD][40612]
2151 - [rustdoc now accepts `#` at the start of files][40828]
2152 - [Fixed jemalloc support for musl][41168]
2157 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
2158 always placed after the sign if it exists and before the digits. With the `#`
2159 flag the zeroes are placed after the prefix and before the digits.
2160 - [Due to the struct field optimisation][40377], using `transmute` on structs
2161 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
2162 always been undefined behavior, but is now more likely to break in practice.
2163 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
2164 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
2165 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
2166 - [Overlapping inherent `impl`s are now a hard error][40728]
2167 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
2168 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
2169 `out.asm` and `out.ll` instead of only one of the filetypes.
2170 - [ calling a function that returns `Self` will no longer work][41805] when
2171 the size of `Self` cannot be statically determined.
2172 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
2173 this has caused a few regressions namely:
2175 - Changed the link order of local static/dynamic libraries (respecting the
2176 order on given rather than having the compiler reorder).
2177 - Changed how MinGW is linked, native code linked to dynamic libraries
2178 may require manually linking to the gcc support library (for the native
2181 [38165]: https://github.com/rust-lang/rust/pull/38165
2182 [39799]: https://github.com/rust-lang/rust/pull/39799
2183 [39891]: https://github.com/rust-lang/rust/pull/39891
2184 [39983]: https://github.com/rust-lang/rust/pull/39983
2185 [40043]: https://github.com/rust-lang/rust/pull/40043
2186 [40241]: https://github.com/rust-lang/rust/pull/40241
2187 [40338]: https://github.com/rust-lang/rust/pull/40338
2188 [40367]: https://github.com/rust-lang/rust/pull/40367
2189 [40377]: https://github.com/rust-lang/rust/pull/40377
2190 [40409]: https://github.com/rust-lang/rust/pull/40409
2191 [40516]: https://github.com/rust-lang/rust/pull/40516
2192 [40556]: https://github.com/rust-lang/rust/pull/40556
2193 [40561]: https://github.com/rust-lang/rust/pull/40561
2194 [40589]: https://github.com/rust-lang/rust/pull/40589
2195 [40612]: https://github.com/rust-lang/rust/pull/40612
2196 [40723]: https://github.com/rust-lang/rust/pull/40723
2197 [40728]: https://github.com/rust-lang/rust/pull/40728
2198 [40731]: https://github.com/rust-lang/rust/pull/40731
2199 [40734]: https://github.com/rust-lang/rust/pull/40734
2200 [40805]: https://github.com/rust-lang/rust/pull/40805
2201 [40807]: https://github.com/rust-lang/rust/pull/40807
2202 [40828]: https://github.com/rust-lang/rust/pull/40828
2203 [40870]: https://github.com/rust-lang/rust/pull/40870
2204 [41085]: https://github.com/rust-lang/rust/pull/41085
2205 [41143]: https://github.com/rust-lang/rust/pull/41143
2206 [41168]: https://github.com/rust-lang/rust/pull/41168
2207 [41270]: https://github.com/rust-lang/rust/issues/41270
2208 [41469]: https://github.com/rust-lang/rust/pull/41469
2209 [41805]: https://github.com/rust-lang/rust/issues/41805
2210 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
2211 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
2212 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
2213 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
2214 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
2215 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
2216 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
2217 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
2218 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
2219 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
2220 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
2221 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
2222 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
2223 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
2226 Version 1.17.0 (2017-04-27)
2227 ===========================
2232 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
2233 * [Fields of structs may be initialized without duplicating the field/variable
2234 names][39761]. [RFC 1682]
2235 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
2236 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2237 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
2238 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
2239 `'b`. Soundness fix.
2240 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
2241 * [Static variables may contain references to other statics][40027]
2246 * [Exit quickly on only `--emit dep-info`][40336]
2247 * [Make `-C relocation-model` more correctly determine whether the linker
2248 creates a position-independent executable][40245]
2249 * [Add `-C overflow-checks` to directly control whether integer overflow
2251 * [The rustc type checker now checks items on demand instead of in a single
2252 in-order pass][40008]. This is mostly an internal refactoring in support of
2253 future work, including incremental type checking, but also resolves [RFC
2254 1647], allowing `Self` to appear in `impl` `where` clauses.
2255 * [Optimize vtable loads][39995]
2256 * [Turn off vectorization for Emscripten targets][39990]
2257 * [Provide suggestions for unknown macros imported with `use`][39953]
2258 * [Fix ICEs in path resolution][39939]
2259 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
2260 * [Add clearer error message using `&str + &str`][39116]
2271 * [`Ordering::then`]
2272 * [`Ordering::then_with`]
2273 * [`BTreeMap::range`]
2274 * [`BTreeMap::range_mut`]
2275 * [`collections::Bound`]
2276 * [`process::abort`]
2277 * [`ptr::read_unaligned`]
2278 * [`ptr::write_unaligned`]
2279 * [`Result::expect_err`]
2282 * [`Cell::into_inner`]
2288 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
2289 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
2290 * [`String` implements `FromIterator<&char>`][40028]
2291 * `Box` [implements][40009] a number of new conversions:
2292 `From<Box<str>> for String`,
2293 `From<Box<[T]>> for Vec<T>`,
2294 `From<Box<CStr>> for CString`,
2295 `From<Box<OsStr>> for OsString`,
2296 `From<Box<Path>> for PathBuf`,
2297 `Into<Box<str>> for String`,
2298 `Into<Box<[T]>> for Vec<T>`,
2299 `Into<Box<CStr>> for CString`,
2300 `Into<Box<OsStr>> for OsString`,
2301 `Into<Box<Path>> for PathBuf`,
2302 `Default for Box<str>`,
2303 `Default for Box<CStr>`,
2304 `Default for Box<OsStr>`,
2305 `From<&CStr> for Box<CStr>`,
2306 `From<&OsStr> for Box<OsStr>`,
2307 `From<&Path> for Box<Path>`
2308 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
2309 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
2310 * [Slightly optimize `slice::sort`][39538]
2311 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
2312 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
2313 `Box<str>` implements `From<&str>`][39438]
2314 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
2315 `From<(I, u16)> where I: Into<IpAddr>`][39372]
2316 * [`format!` estimates the needed capacity before writing a string][39356]
2317 * [Support unprivileged symlink creation in Windows][38921]
2318 * [`PathBuf` implements `Default`][38764]
2319 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
2320 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
2321 and poor hash functions.
2326 * [Add `cargo check --all`][cargo/3731]
2327 * [Add an option to ignore SSL revocation checking][cargo/3699]
2328 * [Add `cargo run --package`][cargo/3691]
2329 * [Add `required_features`][cargo/3667]
2330 * [Assume `build.rs` is a build script][cargo/3664]
2331 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
2336 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
2338 * [The "Unstable Book" documents nightly-only features][ubook]
2339 * [Improve the style of the sidebar in rustdoc output][40265]
2340 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
2341 * [Fix MSP430 breakage due to `i128`][40257]
2342 * [Preliminary Solaris/SPARCv9 support][39903]
2343 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
2344 run without installing the MSVC runtime.
2345 * [`rustdoc --test` includes file names in test names][39788]
2346 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
2347 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
2348 * [Initial support for `aarch64-unknown-freebsd`][39491]
2349 * [Initial support for `i686-unknown-netbsd`][39426]
2350 * [This release no longer includes the old makefile build system][39431]. Rust
2351 is built with a custom build system, written in Rust, and with Cargo.
2352 * [Add Debug implementations for libcollection structs][39002]
2353 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
2354 * [`--test-threads=0` produces an error][38945]
2355 * [`rustup` installs documentation by default][40526]
2356 * [The Rust source includes NatVis visualizations][39843]. These can be used by
2357 WinDbg and Visual Studio to improve the debugging experience.
2362 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
2363 workaround, either use MSVC 2015 or run vcvars.bat.
2364 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
2365 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
2366 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
2368 * [`format!` and `Display::to_string` panic if an underlying formatting
2369 implementation returns an error][40117]. Previously the error was silently
2370 ignored. It is incorrect for `write_fmt` to return an error when writing
2372 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
2373 crates were marked stable and could be accessed from the stable toolchain.
2374 * [Rust git source no longer includes vendored crates][39728]. Those that need
2375 to build with vendored crates should build from release tarballs.
2376 * [Fix inert attributes from `proc_macro_derives`][39572]
2377 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
2378 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
2380 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
2381 existing code generally ignores the type of dead-code unless a type-hint is
2382 provided; this can cause surprising inference interactions particularly around
2383 defaulting. The new code uniformly ignores the result type of dead-code.
2384 * [Tuple-struct constructors with private fields are no longer visible][38932]
2385 * [Lifetime parameters that do not appear in the arguments are now considered
2386 early-bound][38897], resolving a soundness bug (#[32330]). The
2387 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
2389 * [rustdoc: fix doctests with non-feature crate attributes][38161]
2390 * [Make transmuting from fn item types to pointer-sized types a hard
2393 [27787]: https://github.com/rust-lang/rust/issues/27787
2394 [32330]: https://github.com/rust-lang/rust/issues/32330
2395 [34198]: https://github.com/rust-lang/rust/pull/34198
2396 [38161]: https://github.com/rust-lang/rust/pull/38161
2397 [38368]: https://github.com/rust-lang/rust/pull/38368
2398 [38584]: https://github.com/rust-lang/rust/issues/38584
2399 [38661]: https://github.com/rust-lang/rust/pull/38661
2400 [38764]: https://github.com/rust-lang/rust/pull/38764
2401 [38864]: https://github.com/rust-lang/rust/issues/38864
2402 [38897]: https://github.com/rust-lang/rust/pull/38897
2403 [38921]: https://github.com/rust-lang/rust/pull/38921
2404 [38932]: https://github.com/rust-lang/rust/pull/38932
2405 [38945]: https://github.com/rust-lang/rust/pull/38945
2406 [38981]: https://github.com/rust-lang/rust/pull/38981
2407 [39002]: https://github.com/rust-lang/rust/pull/39002
2408 [39116]: https://github.com/rust-lang/rust/pull/39116
2409 [39193]: https://github.com/rust-lang/rust/pull/39193
2410 [39265]: https://github.com/rust-lang/rust/pull/39265
2411 [39356]: https://github.com/rust-lang/rust/pull/39356
2412 [39372]: https://github.com/rust-lang/rust/pull/39372
2413 [39426]: https://github.com/rust-lang/rust/pull/39426
2414 [39431]: https://github.com/rust-lang/rust/pull/39431
2415 [39438]: https://github.com/rust-lang/rust/pull/39438
2416 [39440]: https://github.com/rust-lang/rust/pull/39440
2417 [39485]: https://github.com/rust-lang/rust/pull/39485
2418 [39491]: https://github.com/rust-lang/rust/pull/39491
2419 [39518]: https://github.com/rust-lang/rust/pull/39518
2420 [39538]: https://github.com/rust-lang/rust/pull/39538
2421 [39572]: https://github.com/rust-lang/rust/pull/39572
2422 [39633]: https://github.com/rust-lang/rust/pull/39633
2423 [39642]: https://github.com/rust-lang/rust/pull/39642
2424 [39728]: https://github.com/rust-lang/rust/pull/39728
2425 [39761]: https://github.com/rust-lang/rust/pull/39761
2426 [39788]: https://github.com/rust-lang/rust/pull/39788
2427 [39793]: https://github.com/rust-lang/rust/pull/39793
2428 [39837]: https://github.com/rust-lang/rust/pull/39837
2429 [39843]: https://github.com/rust-lang/rust/pull/39843
2430 [39851]: https://github.com/rust-lang/rust/pull/39851
2431 [39903]: https://github.com/rust-lang/rust/pull/39903
2432 [39939]: https://github.com/rust-lang/rust/pull/39939
2433 [39953]: https://github.com/rust-lang/rust/pull/39953
2434 [39960]: https://github.com/rust-lang/rust/pull/39960
2435 [39990]: https://github.com/rust-lang/rust/pull/39990
2436 [39995]: https://github.com/rust-lang/rust/pull/39995
2437 [40008]: https://github.com/rust-lang/rust/pull/40008
2438 [40009]: https://github.com/rust-lang/rust/pull/40009
2439 [40027]: https://github.com/rust-lang/rust/pull/40027
2440 [40028]: https://github.com/rust-lang/rust/pull/40028
2441 [40037]: https://github.com/rust-lang/rust/pull/40037
2442 [40117]: https://github.com/rust-lang/rust/pull/40117
2443 [40166]: https://github.com/rust-lang/rust/pull/40166
2444 [40245]: https://github.com/rust-lang/rust/pull/40245
2445 [40257]: https://github.com/rust-lang/rust/pull/40257
2446 [40261]: https://github.com/rust-lang/rust/pull/40261
2447 [40265]: https://github.com/rust-lang/rust/pull/40265
2448 [40319]: https://github.com/rust-lang/rust/pull/40319
2449 [40336]: https://github.com/rust-lang/rust/pull/40336
2450 [40526]: https://github.com/rust-lang/rust/pull/40526
2451 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2452 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
2453 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
2454 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
2455 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
2456 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
2457 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
2458 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
2459 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
2460 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
2461 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
2462 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
2463 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
2464 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
2465 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2466 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
2467 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
2468 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
2469 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
2470 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
2471 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
2472 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
2473 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
2474 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
2475 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
2476 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
2477 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
2478 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
2479 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
2480 [mdbook]: https://crates.io/crates/mdbook
2481 [ubook]: https://doc.rust-lang.org/unstable-book/
2484 Version 1.16.0 (2017-03-16)
2485 ===========================
2490 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2491 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2492 match patterns][38069]
2493 * [Clean up semantics of `self` in an import list][38313]
2494 * [`Self` may appear in `impl` headers][38920]
2495 * [`Self` may appear in struct expressions][39282]
2500 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
2501 a `.rmeta` file containing only crate metadata][38571]. This can be
2502 used by tools like the Rust Language Service to perform
2503 metadata-only builds.
2504 * [Levenshtein based typo suggestions now work in most places, while
2505 previously they worked only for fields and sometimes for local
2506 variables][38927]. Together with the overhaul of "no
2507 resolution"/"unexpected resolution" errors (#[38154]) they result in
2508 large and systematic improvement in resolution diagnostics.
2509 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
2511 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
2512 * [`rustc` no longer attempts to provide "consider using an explicit
2513 lifetime" suggestions][37057]. They were inaccurate.
2518 * [`VecDeque::truncate`]
2519 * [`VecDeque::resize`]
2520 * [`String::insert_str`]
2521 * [`Duration::checked_add`]
2522 * [`Duration::checked_sub`]
2523 * [`Duration::checked_div`]
2524 * [`Duration::checked_mul`]
2527 * [`SocketAddr::is_ipv4`]
2528 * [`SocketAddr::is_ipv6`]
2529 * [`IpAddr::is_ipv4`]
2530 * [`IpAddr::is_ipv6`]
2532 * [`Vec::dedup_by_key`]
2533 * [`Result::unwrap_or_default`]
2534 * [`<*const T>::wrapping_offset`]
2535 * [`<*mut T>::wrapping_offset`]
2536 * `CommandExt::creation_flags`
2537 * [`File::set_permissions`]
2538 * [`String::split_off`]
2543 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
2544 their argument by `Borrow` parameter][37761]
2545 * [All public types in std implement `Debug`][38006]
2546 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
2547 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
2548 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2550 * [std: Fix partial writes in `LineWriter`][38062]
2551 * [std: Clamp max read/write sizes on Unix][38062]
2552 * [Use more specific panic message for `&str` slicing errors][38066]
2553 * [`TcpListener::set_only_v6` is deprecated][38304]. This
2554 functionality cannot be achieved in std currently.
2555 * [`writeln!`, like `println!`, now accepts a form with no string
2556 or formatting arguments, to just print a newline][38469]
2557 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
2558 * [Reduce the size of static data in `std_unicode::tables`][38781]
2559 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
2560 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
2562 * [`Duration` implements `Sum`][38712]
2563 * [`String` implements `ToSocketAddrs`][39048]
2568 * [The `cargo check` command does a type check of a project without
2569 building it][cargo/3296]
2570 * [crates.io will display CI badges from Travis and AppVeyor, if
2571 specified in Cargo.toml][cargo/3546]
2572 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
2573 * [Compilation profiles accept integer values for `debug`, in addition
2574 to `true` and `false`. These are passed to `rustc` as the value to
2575 `-C debuginfo`][cargo/3534]
2576 * [Implement `cargo --version --verbose`][cargo/3604]
2577 * [All builds now output 'dep-info' build dependencies compatible with
2578 make and ninja][cargo/3557]
2579 * [Build all workspace members with `build --all`][cargo/3511]
2580 * [Document all workspace members with `doc --all`][cargo/3515]
2581 * [Path deps outside workspace are not members][cargo/3443]
2586 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
2587 the path to the Rust implementation][38589]
2588 * [The `armv7-linux-androideabi` target no longer enables NEON
2589 extensions, per Google's ABI guide][38413]
2590 * [The stock standard library can be compiled for Redox OS][38401]
2591 * [Rust has initial SPARC support][38726]. Tier 3. No builds
2593 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
2595 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
2600 * [Uninhabitable enums (those without any variants) no longer permit wildcard
2601 match patterns][38069]
2602 * In this release, references to uninhabited types can not be
2603 pattern-matched. This was accidentally allowed in 1.15.
2604 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
2605 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
2607 * [Clean up semantics of `self` in an import list][38313]
2608 * Reimplemented lifetime elision. This change was almost entirely compatible
2609 with existing code, but it did close a number of small bugs and loopholes,
2610 as well as being more accepting in some other [cases][41105].
2612 [37057]: https://github.com/rust-lang/rust/pull/37057
2613 [37761]: https://github.com/rust-lang/rust/pull/37761
2614 [38006]: https://github.com/rust-lang/rust/pull/38006
2615 [38051]: https://github.com/rust-lang/rust/pull/38051
2616 [38062]: https://github.com/rust-lang/rust/pull/38062
2617 [38062]: https://github.com/rust-lang/rust/pull/38622
2618 [38066]: https://github.com/rust-lang/rust/pull/38066
2619 [38069]: https://github.com/rust-lang/rust/pull/38069
2620 [38131]: https://github.com/rust-lang/rust/pull/38131
2621 [38154]: https://github.com/rust-lang/rust/pull/38154
2622 [38274]: https://github.com/rust-lang/rust/pull/38274
2623 [38304]: https://github.com/rust-lang/rust/pull/38304
2624 [38313]: https://github.com/rust-lang/rust/pull/38313
2625 [38314]: https://github.com/rust-lang/rust/pull/38314
2626 [38327]: https://github.com/rust-lang/rust/pull/38327
2627 [38401]: https://github.com/rust-lang/rust/pull/38401
2628 [38413]: https://github.com/rust-lang/rust/pull/38413
2629 [38469]: https://github.com/rust-lang/rust/pull/38469
2630 [38559]: https://github.com/rust-lang/rust/pull/38559
2631 [38571]: https://github.com/rust-lang/rust/pull/38571
2632 [38580]: https://github.com/rust-lang/rust/pull/38580
2633 [38589]: https://github.com/rust-lang/rust/pull/38589
2634 [38670]: https://github.com/rust-lang/rust/pull/38670
2635 [38712]: https://github.com/rust-lang/rust/pull/38712
2636 [38726]: https://github.com/rust-lang/rust/pull/38726
2637 [38781]: https://github.com/rust-lang/rust/pull/38781
2638 [38798]: https://github.com/rust-lang/rust/pull/38798
2639 [38909]: https://github.com/rust-lang/rust/pull/38909
2640 [38920]: https://github.com/rust-lang/rust/pull/38920
2641 [38927]: https://github.com/rust-lang/rust/pull/38927
2642 [39048]: https://github.com/rust-lang/rust/pull/39048
2643 [39282]: https://github.com/rust-lang/rust/pull/39282
2644 [39379]: https://github.com/rust-lang/rust/pull/39379
2645 [41105]: https://github.com/rust-lang/rust/issues/41105
2646 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2647 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
2648 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
2649 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
2650 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
2651 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
2652 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
2653 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
2654 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
2655 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
2656 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
2657 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
2658 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
2659 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
2660 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
2661 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
2662 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
2663 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
2664 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
2665 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
2666 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
2667 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
2668 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
2669 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
2670 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
2671 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
2672 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
2673 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
2674 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
2675 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
2678 Version 1.15.1 (2017-02-09)
2679 ===========================
2681 * [Fix IntoIter::as_mut_slice's signature][39466]
2682 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
2684 [39466]: https://github.com/rust-lang/rust/pull/39466
2685 [39523]: https://github.com/rust-lang/rust/pull/39523
2688 Version 1.15.0 (2017-02-02)
2689 ===========================
2694 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
2695 stable. This allows popular code-generating crates like Serde and Diesel to
2696 work ergonomically. [RFC 1681].
2697 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
2698 with curly braces][36868]. Part of [RFC 1506].
2699 * [A number of minor changes to name resolution have been activated][37127].
2700 They add up to more consistent semantics, allowing for future evolution of
2701 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2702 details of what is different. The breaking changes here have been transitioned
2703 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2704 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
2706 * [`?Sized` can be used in `where` clauses][37791]
2707 * [There is now a limit on the size of monomorphized types and it can be
2708 modified with the `#![type_size_limit]` crate attribute, similarly to
2709 the `#![recursion_limit]` attribute][37789]
2714 * [On Windows, the compiler will apply dllimport attributes when linking to
2715 extern functions][37973]. Additional attributes and flags can control which
2716 library kind is linked and its name. [RFC 1717].
2717 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2718 * [The `--test` flag works with procedural macro crates][38107]
2719 * [Fix `extern "aapcs" fn` ABI][37814]
2720 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
2721 * [The `format!` expander recognizes incorrect `printf` and shell-style
2722 formatting directives and suggests the correct format][37613].
2723 * [Only report one error for all unused imports in an import list][37456]
2725 Compiler Performance
2726 --------------------
2728 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
2729 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
2730 * [Don't clone in `UnificationTable::probe`][37848]
2731 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
2732 * [Use small vectors in type walker][37760]
2733 * [Macro expansion performance was improved][37701]
2734 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
2735 * [Replace FNV with a faster hash function][37229]
2740 * [`std::iter::Iterator::min_by`]
2741 * [`std::iter::Iterator::max_by`]
2742 * [`std::os::*::fs::FileExt`]
2743 * [`std::sync::atomic::Atomic*::get_mut`]
2744 * [`std::sync::atomic::Atomic*::into_inner`]
2745 * [`std::vec::IntoIter::as_slice`]
2746 * [`std::vec::IntoIter::as_mut_slice`]
2747 * [`std::sync::mpsc::Receiver::try_iter`]
2748 * [`std::os::unix::process::CommandExt::before_exec`]
2749 * [`std::rc::Rc::strong_count`]
2750 * [`std::rc::Rc::weak_count`]
2751 * [`std::sync::Arc::strong_count`]
2752 * [`std::sync::Arc::weak_count`]
2753 * [`std::char::encode_utf8`]
2754 * [`std::char::encode_utf16`]
2755 * [`std::cell::Ref::clone`]
2756 * [`std::io::Take::into_inner`]
2761 * [The standard sorting algorithm has been rewritten for dramatic performance
2762 improvements][38192]. It is a hybrid merge sort, drawing influences from
2763 Timsort. Previously it was a naive merge sort.
2764 * [`Iterator::nth` no longer has a `Sized` bound][38134]
2765 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
2767 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
2768 and `char_indices().last()`][37882]
2769 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
2770 * [Chinese characters display correctly in `fmt::Debug`][37855]
2771 * [Derive `Default` for `Duration`][37699]
2772 * [Support creation of anonymous pipes on WinXP/2k][37677]
2773 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
2774 * [Don't pass overlapped handles to processes][38835]
2779 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2780 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2781 should instead check the variable at runtime with `std::env`. That the value
2782 was set at build time was a bug, and incorrect when cross-compiling. This
2783 change is known to cause breakage.
2784 * [Add `--all` flag to `cargo test`][cargo/3221]
2785 * [Compile statically against the MSVC CRT][cargo/3363]
2786 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
2787 * [Link OpenSSL statically on OSX][cargo/3311]
2788 * [Apply new fingerprinting to build dir outputs][cargo/3310]
2789 * [Test for bad path overrides with summaries][cargo/3336]
2790 * [Require `cargo install --vers` to take a semver version][cargo/3338]
2791 * [Fix retrying crate downloads for network errors][cargo/3348]
2792 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
2793 * [Emit more info on --message-format=json][cargo/3319]
2794 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
2795 * [Don't ignore errors in workspace manifest][cargo/3409]
2796 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
2801 * [Test runners (binaries built with `--test`) now support a `--list` argument
2802 that lists the tests it contains][38185]
2803 * [Test runners now support a `--exact` argument that makes the test filter
2804 match exactly, instead of matching only a substring of the test name][38181]
2805 * [rustdoc supports a `--playground-url` flag][37763]
2806 * [rustdoc provides more details about `#[should_panic]` errors][37749]
2811 * [The Rust build system is now written in Rust][37817]. The Makefiles may
2812 continue to be used in this release by passing `--disable-rustbuild` to the
2813 configure script, but they will be deleted soon. Note that the new build
2814 system uses a different on-disk layout that will likely affect any scripts
2816 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
2818 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
2819 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
2825 * [A number of minor changes to name resolution have been activated][37127].
2826 They add up to more consistent semantics, allowing for future evolution of
2827 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
2828 details of what is different. The breaking changes here have been transitioned
2829 through the [`legacy_imports`] lint since 1.14, with no known regressions.
2830 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
2831 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
2832 should instead check the variable at runtime with `std::env`. That the value
2833 was set at build time was a bug, and incorrect when cross-compiling. This
2834 change is known to cause breakage.
2835 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
2836 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
2837 1.10 and is now an error by default. It will become a hard error in the near
2839 * [The semantics relating modules to file system directories are changing in
2840 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
2841 lint, which is a warning in this release, and will become a hard error in the
2843 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
2844 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
2845 the underlying iterator][37834]
2847 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
2848 [33685]: https://github.com/rust-lang/rust/issues/33685
2849 [36868]: https://github.com/rust-lang/rust/pull/36868
2850 [37127]: https://github.com/rust-lang/rust/pull/37127
2851 [37229]: https://github.com/rust-lang/rust/pull/37229
2852 [37456]: https://github.com/rust-lang/rust/pull/37456
2853 [37527]: https://github.com/rust-lang/rust/pull/37527
2854 [37602]: https://github.com/rust-lang/rust/pull/37602
2855 [37613]: https://github.com/rust-lang/rust/pull/37613
2856 [37615]: https://github.com/rust-lang/rust/pull/37615
2857 [37636]: https://github.com/rust-lang/rust/pull/37636
2858 [37627]: https://github.com/rust-lang/rust/pull/37627
2859 [37642]: https://github.com/rust-lang/rust/pull/37642
2860 [37677]: https://github.com/rust-lang/rust/pull/37677
2861 [37699]: https://github.com/rust-lang/rust/pull/37699
2862 [37701]: https://github.com/rust-lang/rust/pull/37701
2863 [37705]: https://github.com/rust-lang/rust/pull/37705
2864 [37749]: https://github.com/rust-lang/rust/pull/37749
2865 [37760]: https://github.com/rust-lang/rust/pull/37760
2866 [37763]: https://github.com/rust-lang/rust/pull/37763
2867 [37764]: https://github.com/rust-lang/rust/pull/37764
2868 [37789]: https://github.com/rust-lang/rust/pull/37789
2869 [37791]: https://github.com/rust-lang/rust/pull/37791
2870 [37814]: https://github.com/rust-lang/rust/pull/37814
2871 [37817]: https://github.com/rust-lang/rust/pull/37817
2872 [37834]: https://github.com/rust-lang/rust/pull/37834
2873 [37848]: https://github.com/rust-lang/rust/pull/37848
2874 [37855]: https://github.com/rust-lang/rust/pull/37855
2875 [37882]: https://github.com/rust-lang/rust/pull/37882
2876 [37888]: https://github.com/rust-lang/rust/pull/37888
2877 [37973]: https://github.com/rust-lang/rust/pull/37973
2878 [37979]: https://github.com/rust-lang/rust/pull/37979
2879 [38086]: https://github.com/rust-lang/rust/pull/38086
2880 [38107]: https://github.com/rust-lang/rust/pull/38107
2881 [38117]: https://github.com/rust-lang/rust/pull/38117
2882 [38134]: https://github.com/rust-lang/rust/pull/38134
2883 [38146]: https://github.com/rust-lang/rust/pull/38146
2884 [38181]: https://github.com/rust-lang/rust/pull/38181
2885 [38182]: https://github.com/rust-lang/rust/pull/38182
2886 [38185]: https://github.com/rust-lang/rust/pull/38185
2887 [38192]: https://github.com/rust-lang/rust/pull/38192
2888 [38279]: https://github.com/rust-lang/rust/pull/38279
2889 [38835]: https://github.com/rust-lang/rust/pull/38835
2890 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
2891 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
2892 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
2893 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
2894 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
2895 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
2896 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
2897 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
2898 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
2899 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
2900 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
2901 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
2902 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
2903 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
2904 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
2905 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
2906 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
2907 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
2908 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
2909 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
2910 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
2911 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
2912 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
2913 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
2914 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
2915 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
2916 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
2917 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
2918 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
2919 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
2920 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
2921 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
2922 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
2923 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
2924 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
2925 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
2926 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
2927 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
2930 Version 1.14.0 (2016-12-22)
2931 ===========================
2936 * [`..` matches multiple tuple fields in enum variants, structs
2937 and tuples][36843]. [RFC 1492].
2938 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
2939 * [`use *` and `use ::*` both glob-import from the crate root][37367]
2940 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
2941 dereferencing][36822]
2946 * [Mark enums with non-zero discriminant as non-zero][37224]
2947 * [Lower-case `static mut` names are linted like other
2948 statics and consts][37162]
2949 * [Fix ICE on some macros in const integer positions
2950 (e.g. `[u8; m!()]`)][36819]
2951 * [Improve error message and snippet for "did you mean `x`"][36798]
2952 * [Add a panic-strategy field to the target specification][36794]
2953 * [Include LLVM version in `--version --verbose`][37200]
2955 Compile-time Optimizations
2956 --------------------------
2958 * [Improve macro expansion performance][37569]
2959 * [Shrink `Expr_::ExprInlineAsm`][37445]
2960 * [Replace all uses of SHA-256 with BLAKE2b][37439]
2961 * [Reduce the number of bytes hashed by `IchHasher`][37427]
2962 * [Avoid more allocations when compiling html5ever][37373]
2963 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
2964 * [Avoid some allocations in the macro parser][37318]
2965 * [Use a faster deflate setting][37298]
2966 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
2967 during interning of slices][37270]
2968 * [Optimize `write_metadata`][37267]
2969 * [Don't process obligation forest cycles when stalled][37231]
2970 * [Avoid many `CrateConfig` clones][37161]
2971 * [Optimize `Substs::super_fold_with`][37108]
2972 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
2973 * [Speed up `plug_leaks`][36917]
2978 * [`println!()`, with no arguments, prints newline][36825].
2979 Previously, an empty string was required to achieve the same.
2980 * [`Wrapping` impls standard binary and unary operators, as well as
2981 the `Sum` and `Product` iterators][37356]
2982 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
2984 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
2985 `VecDeque` iterators][37315]
2986 * [Improve `SipHasher` performance on small values][37312]
2987 * [Add Iterator trait TrustedLen to enable better FromIterator /
2989 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
2990 * [`ReadDir` implements `Debug`][37221]
2991 * [Implement `RefUnwindSafe` for atomic types][37178]
2992 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
2993 * [Avoid allocations in `Decoder::read_str`][37064]
2994 * [`io::Error` implements `From<io::ErrorKind>`][37037]
2995 * [Impl `Debug` for raw pointers to unsized data][36880]
2996 * [Don't reuse `HashMap` random seeds][37470]
2997 * [The internal memory layout of `HashMap` is more cache-friendly, for
2998 significant improvements in some operations][36692]
2999 * [`HashMap` uses less memory on 32-bit architectures][36595]
3000 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
3005 * [Expose rustc cfg values to build scripts][cargo/3243]
3006 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
3007 * [Fix passing --features when testing multiple packages][cargo/3280]
3008 * [Use a single profile set per workspace][cargo/3249]
3009 * [Load `replace` sections from lock files][cargo/3220]
3010 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
3015 * [rustup is the recommended Rust installation method][1.14rustup]
3016 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
3017 S390x. These are [tier 2] platforms and may have major defects. Follow the
3018 instructions on the website to install, or add the targets to an existing
3019 installation with `rustup target add`. The new target triples are:
3020 - `mips-unknown-linux-gnu`
3021 - `mipsel-unknown-linux-gnu`
3022 - `mips64-unknown-linux-gnuabi64`
3023 - `mips64el-unknown-linux-gnuabi64 `
3024 - `powerpc-unknown-linux-gnu`
3025 - `powerpc64-unknown-linux-gnu`
3026 - `powerpc64le-unknown-linux-gnu`
3027 - `s390x-unknown-linux-gnu `
3028 * This release includes target (std) builds for ARM Linux running MUSL
3029 libc. These are [tier 2] platforms and may have major defects. Add the
3030 following triples to an existing rustup installation with `rustup target add`:
3031 - `arm-unknown-linux-musleabi`
3032 - `arm-unknown-linux-musleabihf`
3033 - `armv7-unknown-linux-musleabihf`
3034 * This release includes [experimental support for WebAssembly][1.14wasm], via
3035 the `wasm32-unknown-emscripten` target. This target is known to have major
3036 defects. Please test, report, and fix.
3037 * rustup no longer installs documentation by default. Run `rustup
3038 component add rust-docs` to install.
3039 * [Fix line stepping in debugger][37310]
3040 * [Enable line number debuginfo in releases][37280]
3045 * [Disable jemalloc on aarch64/powerpc/mips][37392]
3046 * [Add support for Fuchsia OS][37313]
3047 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
3052 * [A number of forward-compatibility lints used by the compiler
3053 to gradually introduce language changes have been converted
3054 to deny by default][36894]:
3055 - ["use of inaccessible extern crate erroneously allowed"][36886]
3056 - ["type parameter default erroneously allowed in invalid location"][36887]
3057 - ["detects super or self keywords at the beginning of global path"][36888]
3058 - ["two overlapping inherent impls define an item with the same name
3059 were erroneously allowed"][36889]
3060 - ["floating-point constants cannot be used in patterns"][36890]
3061 - ["constants of struct or enum type can only be used in a pattern if
3062 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
3063 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
3064 * [Prohibit patterns in trait methods without bodies][37378]
3065 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
3066 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
3067 * [The `$crate` macro variable is accepted in fewer locations][37213]
3068 * [Impls specifying extra region requirements beyond the trait
3069 they implement are rejected][37167]
3070 * [Enums may not be unsized][37111]. Unsized enums are intended to
3071 work but never have. For now they are forbidden.
3072 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
3074 [tier 2]: https://forge.rust-lang.org/platform-support.html
3075 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
3076 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
3077 [36430]: https://github.com/rust-lang/rust/pull/36430
3078 [36595]: https://github.com/rust-lang/rust/pull/36595
3079 [36595]: https://github.com/rust-lang/rust/pull/36595
3080 [36692]: https://github.com/rust-lang/rust/pull/36692
3081 [36767]: https://github.com/rust-lang/rust/pull/36767
3082 [36794]: https://github.com/rust-lang/rust/pull/36794
3083 [36798]: https://github.com/rust-lang/rust/pull/36798
3084 [36819]: https://github.com/rust-lang/rust/pull/36819
3085 [36822]: https://github.com/rust-lang/rust/pull/36822
3086 [36825]: https://github.com/rust-lang/rust/pull/36825
3087 [36843]: https://github.com/rust-lang/rust/pull/36843
3088 [36880]: https://github.com/rust-lang/rust/pull/36880
3089 [36886]: https://github.com/rust-lang/rust/issues/36886
3090 [36887]: https://github.com/rust-lang/rust/issues/36887
3091 [36888]: https://github.com/rust-lang/rust/issues/36888
3092 [36889]: https://github.com/rust-lang/rust/issues/36889
3093 [36890]: https://github.com/rust-lang/rust/issues/36890
3094 [36891]: https://github.com/rust-lang/rust/issues/36891
3095 [36892]: https://github.com/rust-lang/rust/issues/36892
3096 [36894]: https://github.com/rust-lang/rust/pull/36894
3097 [36917]: https://github.com/rust-lang/rust/pull/36917
3098 [36993]: https://github.com/rust-lang/rust/pull/36993
3099 [37037]: https://github.com/rust-lang/rust/pull/37037
3100 [37064]: https://github.com/rust-lang/rust/pull/37064
3101 [37094]: https://github.com/rust-lang/rust/pull/37094
3102 [37108]: https://github.com/rust-lang/rust/pull/37108
3103 [37111]: https://github.com/rust-lang/rust/pull/37111
3104 [37161]: https://github.com/rust-lang/rust/pull/37161
3105 [37162]: https://github.com/rust-lang/rust/pull/37162
3106 [37167]: https://github.com/rust-lang/rust/pull/37167
3107 [37178]: https://github.com/rust-lang/rust/pull/37178
3108 [37200]: https://github.com/rust-lang/rust/pull/37200
3109 [37213]: https://github.com/rust-lang/rust/pull/37213
3110 [37221]: https://github.com/rust-lang/rust/pull/37221
3111 [37224]: https://github.com/rust-lang/rust/pull/37224
3112 [37230]: https://github.com/rust-lang/rust/pull/37230
3113 [37231]: https://github.com/rust-lang/rust/pull/37231
3114 [37247]: https://github.com/rust-lang/rust/pull/37247
3115 [37267]: https://github.com/rust-lang/rust/pull/37267
3116 [37270]: https://github.com/rust-lang/rust/pull/37270
3117 [37273]: https://github.com/rust-lang/rust/pull/37273
3118 [37280]: https://github.com/rust-lang/rust/pull/37280
3119 [37298]: https://github.com/rust-lang/rust/pull/37298
3120 [37306]: https://github.com/rust-lang/rust/pull/37306
3121 [37310]: https://github.com/rust-lang/rust/pull/37310
3122 [37312]: https://github.com/rust-lang/rust/pull/37312
3123 [37313]: https://github.com/rust-lang/rust/pull/37313
3124 [37315]: https://github.com/rust-lang/rust/pull/37315
3125 [37318]: https://github.com/rust-lang/rust/pull/37318
3126 [37322]: https://github.com/rust-lang/rust/pull/37322
3127 [37326]: https://github.com/rust-lang/rust/pull/37326
3128 [37351]: https://github.com/rust-lang/rust/pull/37351
3129 [37356]: https://github.com/rust-lang/rust/pull/37356
3130 [37367]: https://github.com/rust-lang/rust/pull/37367
3131 [37373]: https://github.com/rust-lang/rust/pull/37373
3132 [37378]: https://github.com/rust-lang/rust/pull/37378
3133 [37389]: https://github.com/rust-lang/rust/pull/37389
3134 [37392]: https://github.com/rust-lang/rust/pull/37392
3135 [37427]: https://github.com/rust-lang/rust/pull/37427
3136 [37439]: https://github.com/rust-lang/rust/pull/37439
3137 [37445]: https://github.com/rust-lang/rust/pull/37445
3138 [37470]: https://github.com/rust-lang/rust/pull/37470
3139 [37569]: https://github.com/rust-lang/rust/pull/37569
3140 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
3141 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
3142 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
3143 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
3144 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
3145 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
3146 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
3149 Version 1.13.0 (2016-11-10)
3150 ===========================
3155 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
3156 errors, like the `try!` macro, described in [RFC 0243].
3157 * [Stabilize macros in type position][36014]. Described in [RFC 873].
3158 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
3159 * [Fix `#[derive]` for empty tuple structs/variants][35728]
3160 * [Fix lifetime rules for 'if' conditions][36029]
3161 * [Avoid loading and parsing unconfigured non-inline modules][36482]
3166 * [Add the `-C link-arg` argument][36574]
3167 * [Remove the old AST-based backend from rustc_trans][35764]
3168 * [Don't enable NEON by default on armv7 Linux][35814]
3169 * [Fix debug line number info for macro expansions][35238]
3170 * [Do not emit "class method" debuginfo for types that are not
3171 DICompositeType][36008]
3172 * [Warn about multiple conflicting #[repr] hints][34623]
3173 * [When sizing DST, don't double-count nested struct prefixes][36351]
3174 * [Default RUST_MIN_STACK to 16MiB for now][36505]
3175 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
3176 * [Reject macros with empty repetitions to avoid infinite loop][36721]
3177 * [Expand macros without recursing to avoid stack overflows][36214]
3182 * [Replace macro backtraces with labeled local uses][35702]
3183 * [Improve error message for misplaced doc comments][33922]
3184 * [Buffer unix and lock windows to prevent message interleaving][35975]
3185 * [Update lifetime errors to specifically note temporaries][36171]
3186 * [Special case a few colors for Windows][36178]
3187 * [Suggest `use self` when such an import resolves][36289]
3188 * [Be more specific when type parameter shadows primitive type][36338]
3189 * Many minor improvements
3191 Compile-time Optimizations
3192 --------------------------
3194 * [Compute and cache HIR hashes at beginning][35854]
3195 * [Don't hash types in loan paths][36004]
3196 * [Cache projections in trans][35761]
3197 * [Optimize the parser's last token handling][36527]
3198 * [Only instantiate #[inline] functions in codegen units referencing
3199 them][36524]. This leads to big improvements in cases where crates export
3200 define many inline functions without using them directly.
3201 * [Lazily allocate TypedArena's first chunk][36592]
3202 * [Don't allocate during default HashSet creation][36734]
3209 * [`overflowing_abs`]
3210 * [`RefCell::try_borrow`]
3211 * [`RefCell::try_borrow_mut`]
3216 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
3217 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
3219 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
3220 * [Implement `Debug` for `std::vec::IntoIter`][35707]
3221 * [`CString`: avoid excessive growth just to 0-terminate][35871]
3222 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
3223 * [Use arc4rand on FreeBSD][35884]
3224 * [memrchr: Correct aligned offset computation][35969]
3225 * [Improve Demangling of Rust Symbols][36059]
3226 * [Use monotonic time in condition variables][35048]
3227 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
3228 * [Implement conversion traits for `char`][35755]
3229 * [Fix illegal instruction caused by overflow in channel cloning][36104]
3230 * [Zero first byte of CString on drop][36264]
3231 * [Inherit overflow checks for sum and product][36372]
3232 * [Add missing Eq implementations][36423]
3233 * [Implement `Debug` for `DirEntry`][36631]
3234 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
3236 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3237 * [Implement more traits for `std::io::ErrorKind`][35911]
3238 * [Optimize BinaryHeap bounds checking][36072]
3239 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
3240 `extend_with_element`][36355]
3241 * [Fix overflow checking in unsigned pow()][34942]
3246 * This release includes security fixes to both curl and OpenSSL.
3247 * [Fix transitive doctests when panic=abort][cargo/3021]
3248 * [Add --all-features flag to cargo][cargo/3038]
3249 * [Reject path-based dependencies in `cargo package`][cargo/3060]
3250 * [Don't parse the home directory more than once][cargo/3078]
3251 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
3252 * [Update OpenSSL to 1.0.2j][cargo/3121]
3253 * [Add license and license_file to cargo metadata output][cargo/3110]
3254 * [Make crates-io registry URL optional in config; ignore all changes to
3255 source.crates-io][cargo/3089]
3256 * [Don't download dependencies from other platforms][cargo/3123]
3257 * [Build transitive dev-dependencies when needed][cargo/3125]
3258 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
3259 * [Avoid updating registry when adding existing deps][cargo/3144]
3260 * [Warn about path overrides that won't work][cargo/3136]
3261 * [Use workspaces during `cargo install`][cargo/3146]
3262 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
3263 * [Add --message-format flag][cargo/3000]
3264 * [Pass target environment for rustdoc][cargo/3205]
3265 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
3266 * [Update curl and curl-sys][cargo/3241]
3267 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
3272 * [rustdoc: Add the `--sysroot` argument][36586]
3273 * [rustdoc: Fix a couple of issues with the search results][35655]
3274 * [rustdoc: remove the `!` from macro URLs and titles][35234]
3275 * [gdb: Fix pretty-printing special-cased Rust types][35585]
3276 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
3281 * [Remove unmaintained style guide][35124]
3282 * [Add s390x support][36369]
3283 * [Initial work at Haiku OS support][36727]
3284 * [Add mips-uclibc targets][35734]
3285 * [Crate-ify compiler-rt into compiler-builtins][35021]
3286 * [Add rustc version info (git hash + date) to dist tarball][36213]
3287 * Many documentation improvements
3292 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
3293 * [Deny (by default) transmuting from fn item types to pointer-sized
3294 types][34923]. Continuing the long transition to zero-sized fn items,
3296 * [Fix `#[derive]` for empty tuple structs/variants][35728].
3298 * [Issue deprecation warnings for safe accesses to extern statics][36173]
3299 * [Fix lifetime rules for 'if' conditions][36029].
3300 * [Inherit overflow checks for sum and product][36372].
3301 * [Forbid user-defined macros named "macro_rules"][36730].
3303 [33922]: https://github.com/rust-lang/rust/pull/33922
3304 [34623]: https://github.com/rust-lang/rust/pull/34623
3305 [34923]: https://github.com/rust-lang/rust/pull/34923
3306 [34942]: https://github.com/rust-lang/rust/pull/34942
3307 [34982]: https://github.com/rust-lang/rust/pull/34982
3308 [35021]: https://github.com/rust-lang/rust/pull/35021
3309 [35048]: https://github.com/rust-lang/rust/pull/35048
3310 [35074]: https://github.com/rust-lang/rust/pull/35074
3311 [35124]: https://github.com/rust-lang/rust/pull/35124
3312 [35234]: https://github.com/rust-lang/rust/pull/35234
3313 [35238]: https://github.com/rust-lang/rust/pull/35238
3314 [35354]: https://github.com/rust-lang/rust/pull/35354
3315 [35559]: https://github.com/rust-lang/rust/pull/35559
3316 [35585]: https://github.com/rust-lang/rust/pull/35585
3317 [35627]: https://github.com/rust-lang/rust/pull/35627
3318 [35655]: https://github.com/rust-lang/rust/pull/35655
3319 [35702]: https://github.com/rust-lang/rust/pull/35702
3320 [35707]: https://github.com/rust-lang/rust/pull/35707
3321 [35728]: https://github.com/rust-lang/rust/pull/35728
3322 [35734]: https://github.com/rust-lang/rust/pull/35734
3323 [35755]: https://github.com/rust-lang/rust/pull/35755
3324 [35761]: https://github.com/rust-lang/rust/pull/35761
3325 [35764]: https://github.com/rust-lang/rust/pull/35764
3326 [35814]: https://github.com/rust-lang/rust/pull/35814
3327 [35854]: https://github.com/rust-lang/rust/pull/35854
3328 [35871]: https://github.com/rust-lang/rust/pull/35871
3329 [35884]: https://github.com/rust-lang/rust/pull/35884
3330 [35911]: https://github.com/rust-lang/rust/pull/35911
3331 [35969]: https://github.com/rust-lang/rust/pull/35969
3332 [35975]: https://github.com/rust-lang/rust/pull/35975
3333 [36004]: https://github.com/rust-lang/rust/pull/36004
3334 [36008]: https://github.com/rust-lang/rust/pull/36008
3335 [36014]: https://github.com/rust-lang/rust/pull/36014
3336 [36029]: https://github.com/rust-lang/rust/pull/36029
3337 [36059]: https://github.com/rust-lang/rust/pull/36059
3338 [36072]: https://github.com/rust-lang/rust/pull/36072
3339 [36101]: https://github.com/rust-lang/rust/pull/36101
3340 [36104]: https://github.com/rust-lang/rust/pull/36104
3341 [36171]: https://github.com/rust-lang/rust/pull/36171
3342 [36173]: https://github.com/rust-lang/rust/pull/36173
3343 [36178]: https://github.com/rust-lang/rust/pull/36178
3344 [36213]: https://github.com/rust-lang/rust/pull/36213
3345 [36214]: https://github.com/rust-lang/rust/pull/36214
3346 [36264]: https://github.com/rust-lang/rust/pull/36264
3347 [36266]: https://github.com/rust-lang/rust/pull/36266
3348 [36289]: https://github.com/rust-lang/rust/pull/36289
3349 [36338]: https://github.com/rust-lang/rust/pull/36338
3350 [36351]: https://github.com/rust-lang/rust/pull/36351
3351 [36355]: https://github.com/rust-lang/rust/pull/36355
3352 [36369]: https://github.com/rust-lang/rust/pull/36369
3353 [36372]: https://github.com/rust-lang/rust/pull/36372
3354 [36423]: https://github.com/rust-lang/rust/pull/36423
3355 [36482]: https://github.com/rust-lang/rust/pull/36482
3356 [36505]: https://github.com/rust-lang/rust/pull/36505
3357 [36524]: https://github.com/rust-lang/rust/pull/36524
3358 [36527]: https://github.com/rust-lang/rust/pull/36527
3359 [36551]: https://github.com/rust-lang/rust/pull/36551
3360 [36574]: https://github.com/rust-lang/rust/pull/36574
3361 [36586]: https://github.com/rust-lang/rust/pull/36586
3362 [36592]: https://github.com/rust-lang/rust/pull/36592
3363 [36631]: https://github.com/rust-lang/rust/pull/36631
3364 [36639]: https://github.com/rust-lang/rust/pull/36639
3365 [36721]: https://github.com/rust-lang/rust/pull/36721
3366 [36727]: https://github.com/rust-lang/rust/pull/36727
3367 [36730]: https://github.com/rust-lang/rust/pull/36730
3368 [36734]: https://github.com/rust-lang/rust/pull/36734
3369 [36754]: https://github.com/rust-lang/rust/pull/36754
3370 [36995]: https://github.com/rust-lang/rust/pull/36995
3371 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
3372 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
3373 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
3374 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
3375 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
3376 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
3377 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
3378 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
3379 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
3380 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
3381 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
3382 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
3383 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
3384 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
3385 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
3386 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
3387 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
3388 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
3389 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
3390 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
3391 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
3392 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
3393 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
3394 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
3395 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
3396 [rustup]: https://www.rustup.rs
3397 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
3398 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
3399 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
3400 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
3401 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
3402 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
3403 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
3406 Version 1.12.1 (2016-10-20)
3407 ===========================
3412 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
3413 * [Confusion with double negation and booleans][36856]
3414 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
3415 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
3416 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
3417 * [Corrupted memory after updated to 1.12][36936]
3418 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
3419 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
3420 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
3422 [36381]: https://github.com/rust-lang/rust/issues/36381
3423 [36856]: https://github.com/rust-lang/rust/issues/36856
3424 [36875]: https://github.com/rust-lang/rust/issues/36875
3425 [36924]: https://github.com/rust-lang/rust/issues/36924
3426 [36926]: https://github.com/rust-lang/rust/issues/36926
3427 [36936]: https://github.com/rust-lang/rust/issues/36936
3428 [37026]: https://github.com/rust-lang/rust/issues/37026
3429 [37112]: https://github.com/rust-lang/rust/issues/37112
3430 [37153]: https://github.com/rust-lang/rust/issues/37153
3433 Version 1.12.0 (2016-09-29)
3434 ===========================
3439 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3440 This translation pass is far simpler than the previous AST->LLVM pass, and
3441 creates opportunities to perform new optimizations directly on the MIR. It
3442 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3443 * [`rustc` presents a new, more readable error format, along with
3444 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3445 Most common editors supporting Rust have been updated to work with it. It was
3446 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3451 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
3452 This translation pass is far simpler than the previous AST->LLVM pass, and
3453 creates opportunities to perform new optimizations directly on the MIR. It
3454 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
3455 * [Print the Rust target name, not the LLVM target name, with
3456 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
3457 * [The computation of `TypeId` is correct in some cases where it was previously
3458 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
3459 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
3460 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
3461 `--print relocation-models`, and `--print code-models` print the available
3462 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
3463 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
3464 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
3465 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
3466 These targets produce statically-linked binaries. There are no binary release
3472 * [`rustc` presents a new, more readable error format, along with
3473 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
3474 Most common editors supporting Rust have been updated to work with it. It was
3475 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
3476 * [In error descriptions, references are now described in plain English,
3477 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
3478 * [In error type descriptions, unknown numeric types are named `{integer}` or
3479 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
3480 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
3485 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
3486 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
3487 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
3488 useful](https://github.com/rust-lang/rust/pull/34908)
3489 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
3490 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
3491 * [Semicolons are properly required as statement delimiters inside
3492 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
3493 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3498 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
3499 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
3500 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
3501 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
3502 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
3503 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
3504 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
3505 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
3506 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
3507 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
3508 Both on Unix and Windows.
3509 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
3510 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
3511 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
3512 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
3513 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
3514 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
3515 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
3516 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
3521 * [The `format!` macro and friends now allow a single argument to be formatted
3522 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
3523 * [The lifetime bounds on `[T]::binary_search_by` and
3524 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
3525 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
3526 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
3527 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
3528 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
3529 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
3530 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
3531 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
3532 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
3533 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
3534 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
3535 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
3536 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
3537 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
3538 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
3539 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
3540 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
3541 * [`mpsc::sync_channel` `Receiver`s return any available message before
3542 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
3543 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
3544 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
3549 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
3550 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
3551 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
3552 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
3553 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
3554 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
3555 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
3556 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
3557 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
3558 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
3559 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
3560 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
3561 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
3562 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
3563 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
3564 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
3569 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
3570 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
3575 * [Test binaries now support a `--test-threads` argument to specify the number
3576 of threads used to run tests, and which acts the same as the
3577 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
3578 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
3579 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
3580 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3581 * [Rust releases now come with source packages that can be installed by rustup
3582 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
3583 The resulting source code can be used by tools and IDES, located in the
3584 sysroot under `lib/rustlib/src`.
3589 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
3590 * Many minor improvements to the documentation.
3591 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
3596 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
3597 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
3598 * [When formatting strings, if "precision" is specified, the "fill",
3599 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
3600 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
3603 Version 1.11.0 (2016-08-18)
3604 ===========================
3609 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
3610 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
3611 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
3612 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
3613 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
3618 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
3619 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
3620 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
3621 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
3622 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
3623 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
3624 (in libcore - previously stabilized in libstd)
3625 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
3626 (in libcore - previously stabilized in libstd)
3627 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
3628 (in libcore - previously stabilized in libstd)
3629 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
3630 (in libcore - previously stabilized in libstd)
3631 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3632 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
3633 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
3634 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
3639 * [The `thread_local!` macro supports multiple definitions in a single
3640 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
3641 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
3642 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
3643 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
3644 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
3645 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
3646 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
3647 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
3652 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
3653 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
3654 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
3655 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
3656 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
3657 and `-vv` prints warnings for all crates.
3658 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
3659 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
3660 This provides room for expansion by arbitrary tools.
3661 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
3662 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
3663 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
3664 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
3665 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
3666 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
3667 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
3672 * [Caching projections speeds up type check dramatically for some
3673 workloads](https://github.com/rust-lang/rust/pull/33816)
3674 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
3675 This hasher is faster, but is believed to provide sufficient
3676 protection from collision attacks.
3677 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
3682 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
3683 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
3684 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
3685 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
3686 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
3691 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
3692 * [When emitting debug info, rustc emits frame pointers for closures,
3693 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
3694 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
3695 * Many more errors have been given error codes and extended
3697 * API documentation continues to be improved, with many new examples
3702 * [rustc no longer hangs when dependencies recursively re-export
3703 submodules](https://github.com/rust-lang/rust/pull/34542)
3704 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
3705 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
3706 rewritten](https://github.com/rust-lang/rust/pull/33895)
3707 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
3708 No targets use this yet, but it works toward AVR support.
3713 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
3714 * [The new follow-set rules that place restrictions on `macro_rules!`
3715 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
3716 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
3717 and has been a warning since 1.10.
3718 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
3719 This causes breakage in some corner cases.
3722 Version 1.10.0 (2016-07-07)
3723 ===========================
3728 * [Allow `concat_idents!` in type positions as well as in expression
3729 positions](https://github.com/rust-lang/rust/pull/33735).
3730 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
3731 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
3732 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
3733 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
3734 * [`panic!` can be converted to a runtime abort with the
3735 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
3736 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3737 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
3738 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
3739 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
3740 Note that Cargo does not yet directly support cdylibs.
3745 * `os::windows::fs::OpenOptionsExt::access_mode`
3746 * `os::windows::fs::OpenOptionsExt::share_mode`
3747 * `os::windows::fs::OpenOptionsExt::custom_flags`
3748 * `os::windows::fs::OpenOptionsExt::attributes`
3749 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
3750 * `os::unix::fs::OpenOptionsExt::custom_flags`
3751 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
3752 * `Default for sync::Weak`
3753 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
3754 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
3755 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
3756 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
3757 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
3758 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
3759 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
3760 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
3761 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
3762 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
3763 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
3764 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
3765 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
3766 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
3767 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
3768 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
3769 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
3770 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
3771 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
3772 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
3773 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
3774 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
3775 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
3776 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
3777 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
3778 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3779 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3780 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
3781 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
3782 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
3783 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
3784 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
3785 * Read/Write/RawFd impls for `UnixStream`
3786 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
3787 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
3788 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
3789 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
3790 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
3791 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
3792 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
3793 * RawFd impls for `UnixListener`
3794 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
3795 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
3796 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
3797 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
3798 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
3799 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
3800 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
3801 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
3802 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
3803 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
3804 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
3805 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
3806 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
3807 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
3808 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
3809 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
3810 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
3811 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
3812 * RawFd impls for `UnixDatagram`
3813 * `{BTree,Hash}Map::values_mut`
3814 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
3819 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
3820 The semantics of this minor method are subtle and probably not what
3822 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
3823 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
3824 will fall back to `/dev/urandom` temporarily to avoid blocking
3825 during early boot](https://github.com/rust-lang/rust/pull/33086).
3826 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
3827 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
3828 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
3829 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
3830 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
3831 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
3832 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
3836 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
3837 This controls the runtime behavior of the `panic!` macro
3838 and can be either "unwind" (the default), or "abort".
3839 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
3840 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
3841 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
3842 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
3843 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
3844 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
3845 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
3846 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
3847 By default they are retried twice, which can be customized with the
3848 `net.retry` value in `.cargo/config`.
3849 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
3850 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
3851 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
3852 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
3853 Makes it possible to install multiple crates in parallel.
3854 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
3855 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
3856 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
3857 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
3858 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
3859 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
3864 * [rustc memory usage was reduced by refactoring the context used for
3865 type checking](https://github.com/rust-lang/rust/pull/33425).
3866 * [Speed up creation of `HashMap`s by caching the random keys used
3867 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
3868 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
3869 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
3870 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
3871 10x faster than the previous lookup tables.
3872 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
3877 * Many incremental improvements to documentation and rustdoc.
3878 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
3879 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
3880 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
3881 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
3882 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
3883 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
3884 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
3889 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
3890 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
3891 * [`std` no longer prints backtraces on platforms where the running
3892 module must be loaded with `env::current_exe`, which can't be relied
3893 on](https://github.com/rust-lang/rust/pull/33554).
3894 * This release includes std binaries for the i586-unknown-linux-gnu,
3895 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
3896 i586 target is for old x86 hardware without SSE2, and the armv7
3897 target is for Android running on modern ARM architectures.
3898 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
3899 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
3900 * [On Unix the runtime aborts by calling `libc::abort` instead of
3901 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
3902 * [Rust is now bootstrapped from the previous release of Rust,
3903 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
3908 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
3909 * [`target_env` for Linux ARM targets is just `gnu`, not
3910 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
3911 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
3912 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
3913 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
3914 Affects how macros are parsed.
3915 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
3916 * [Feature-gated attributes on macro-generated macro invocations are
3917 now rejected](https://github.com/rust-lang/rust/pull/32791).
3918 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
3919 This caused some minor changes to type inference.
3922 Version 1.9.0 (2016-05-26)
3923 ==========================
3928 * The `#[deprecated]` attribute when applied to an API will generate
3929 warnings when used. The warnings may be suppressed with
3930 `#[allow(deprecated)]`. [RFC 1270].
3931 * [`fn` item types are zero sized, and each `fn` names a unique
3932 type][1.9fn]. This will break code that transmutes `fn`s, so calling
3933 `transmute` on a `fn` type will generate a warning for a few cycles,
3934 then will be converted to an error.
3935 * [Field and method resolution understand visibility, so private
3936 fields and methods cannot prevent the proper use of public fields
3937 and methods][1.9fv].
3938 * [The parser considers unicode codepoints in the
3939 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
3945 * [`std::panic::catch_unwind`][] (renamed from `recover`)
3946 * [`std::panic::resume_unwind`][] (renamed from `propagate`)
3947 * [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
3948 * [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
3949 * [`str::is_char_boundary`]
3950 * [`<*const T>::as_ref`]
3951 * [`<*mut T>::as_ref`]
3952 * [`<*mut T>::as_mut`]
3953 * [`AsciiExt::make_ascii_uppercase`]
3954 * [`AsciiExt::make_ascii_lowercase`]
3955 * [`char::decode_utf16`]
3956 * [`char::DecodeUtf16`]
3957 * [`char::DecodeUtf16Error`]
3958 * [`char::DecodeUtf16Error::unpaired_surrogate`]
3959 * [`BTreeSet::take`]
3960 * [`BTreeSet::replace`]
3963 * [`HashSet::replace`]
3965 * [`OsString::with_capacity`]
3966 * [`OsString::clear`]
3967 * [`OsString::capacity`]
3968 * [`OsString::reserve`]
3969 * [`OsString::reserve_exact`]
3970 * [`OsStr::is_empty`]
3972 * [`std::os::unix::thread`]
3975 * [`JoinHandleExt::as_pthread_t`]
3976 * [`JoinHandleExt::into_pthread_t`]
3977 * [`HashSet::hasher`]
3978 * [`HashMap::hasher`]
3979 * [`CommandExt::exec`]
3980 * [`File::try_clone`]
3981 * [`SocketAddr::set_ip`]
3982 * [`SocketAddr::set_port`]
3983 * [`SocketAddrV4::set_ip`]
3984 * [`SocketAddrV4::set_port`]
3985 * [`SocketAddrV6::set_ip`]
3986 * [`SocketAddrV6::set_port`]
3987 * [`SocketAddrV6::set_flowinfo`]
3988 * [`SocketAddrV6::set_scope_id`]
3989 * [`slice::copy_from_slice`]
3990 * [`ptr::read_volatile`]
3991 * [`ptr::write_volatile`]
3992 * [`OpenOptions::create_new`]
3993 * [`TcpStream::set_nodelay`]
3994 * [`TcpStream::nodelay`]
3995 * [`TcpStream::set_ttl`]
3996 * [`TcpStream::ttl`]
3997 * [`TcpStream::set_only_v6`]
3998 * [`TcpStream::only_v6`]
3999 * [`TcpStream::take_error`]
4000 * [`TcpStream::set_nonblocking`]
4001 * [`TcpListener::set_ttl`]
4002 * [`TcpListener::ttl`]
4003 * [`TcpListener::set_only_v6`]
4004 * [`TcpListener::only_v6`]
4005 * [`TcpListener::take_error`]
4006 * [`TcpListener::set_nonblocking`]
4007 * [`UdpSocket::set_broadcast`]
4008 * [`UdpSocket::broadcast`]
4009 * [`UdpSocket::set_multicast_loop_v4`]
4010 * [`UdpSocket::multicast_loop_v4`]
4011 * [`UdpSocket::set_multicast_ttl_v4`]
4012 * [`UdpSocket::multicast_ttl_v4`]
4013 * [`UdpSocket::set_multicast_loop_v6`]
4014 * [`UdpSocket::multicast_loop_v6`]
4015 * [`UdpSocket::set_multicast_ttl_v6`]
4016 * [`UdpSocket::multicast_ttl_v6`]
4017 * [`UdpSocket::set_ttl`]
4018 * [`UdpSocket::ttl`]
4019 * [`UdpSocket::set_only_v6`]
4020 * [`UdpSocket::only_v6`]
4021 * [`UdpSocket::join_multicast_v4`]
4022 * [`UdpSocket::join_multicast_v6`]
4023 * [`UdpSocket::leave_multicast_v4`]
4024 * [`UdpSocket::leave_multicast_v6`]
4025 * [`UdpSocket::take_error`]
4026 * [`UdpSocket::connect`]
4027 * [`UdpSocket::send`]
4028 * [`UdpSocket::recv`]
4029 * [`UdpSocket::set_nonblocking`]
4034 * [`std::sync::Once` is poisoned if its initialization function
4036 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
4037 * [Most types implement `fmt::Debug`][1.9db].
4038 * [The default buffer size used by `BufReader` and `BufWriter` was
4039 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
4040 used by other languages.
4041 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
4042 `Duration` additionally implements `*=` and `/=`][1.9ta].
4043 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
4044 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
4045 * [`Chain` implements `BufRead`][1.9ch].
4046 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
4051 * [Cargo can now run concurrently][1.9cc].
4052 * [Top-level overrides allow specific revisions of crates to be
4053 overridden through the entire crate graph][1.9ct]. This is intended
4054 to make upgrades easier for large projects, by allowing crates to be
4055 forked temporarily until they've been upgraded and republished.
4056 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
4057 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
4058 on the commandline][1.9cf]. `rustc` arguments can also be specified
4059 in the `build.rustflags` configuration key.
4064 * [The time complexity of comparing variables for equivalence during type
4065 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
4066 to major compilation time improvement in some scenarios.
4067 * [`ToString` is specialized for `str`, giving it the same performance
4068 as `to_owned`][1.9ts].
4069 * [Spawning processes with `Command::output` no longer creates extra
4071 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
4072 for C-like enums][1.9cl].
4077 * [Passing the `--quiet` flag to a test runner will produce
4078 much-abbreviated output][1.9q].
4079 * The Rust Project now publishes std binaries for the
4080 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
4081 `i586-pc-windows-msvc` targets.
4086 * [`std::sync::Once` is poisoned if its initialization function
4088 * [It is illegal to define methods with the same name in overlapping
4089 inherent `impl` blocks][1.9sn].
4090 * [`fn` item types are zero sized, and each `fn` names a unique
4091 type][1.9fn]. This will break code that transmutes `fn`s, so calling
4092 `transmute` on a `fn` type will generate a warning for a few cycles,
4093 then will be converted to an error.
4094 * [Improvements to const evaluation may trigger new errors when integer
4095 literals are out of range][1.9ce].
4098 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
4099 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
4100 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
4101 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
4102 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
4103 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
4104 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
4105 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
4106 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
4107 [1.9db]: https://github.com/rust-lang/rust/pull/32054
4108 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
4109 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
4110 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
4111 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
4112 [1.9o]: https://github.com/rust-lang/rust/pull/32325
4113 [1.9q]: https://github.com/rust-lang/rust/pull/31887
4114 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
4115 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
4116 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
4117 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
4118 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
4119 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
4120 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
4121 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
4122 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4123 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
4124 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
4125 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
4126 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
4127 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
4128 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
4129 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
4130 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
4131 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
4132 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
4133 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
4134 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
4135 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
4136 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
4137 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
4138 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
4139 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
4140 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
4141 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
4142 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
4143 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
4144 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
4145 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
4146 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
4147 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
4148 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
4149 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
4150 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
4151 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
4152 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
4153 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
4154 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
4155 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
4156 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
4157 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
4158 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4159 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4160 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4161 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4162 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4163 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4164 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
4165 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
4166 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
4167 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
4168 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
4169 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
4170 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
4171 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
4172 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
4173 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
4174 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
4175 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
4176 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
4177 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
4178 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
4179 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
4180 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
4181 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
4182 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
4183 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
4184 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
4185 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
4186 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
4187 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
4188 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
4189 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
4190 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
4191 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
4192 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
4193 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
4194 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
4195 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
4196 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
4197 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
4198 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
4199 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
4200 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
4201 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
4202 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
4203 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
4204 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
4205 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
4206 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
4207 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
4210 Version 1.8.0 (2016-04-14)
4211 ==========================
4216 * Rust supports overloading of compound assignment statements like
4217 `+=` by implementing the [`AddAssign`], [`SubAssign`],
4218 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
4219 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
4221 * Empty structs can be defined with braces, as in `struct Foo { }`, in
4222 addition to the non-braced form, `struct Foo;`. [RFC 218].
4228 * [`str::encode_utf16`][] (renamed from `utf16_units`)
4229 * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
4232 * [`ptr::drop_in_place`]
4234 * [`time::SystemTime`]
4236 * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
4237 * [`Instant::elapsed`]
4238 * [`SystemTime::now`]
4239 * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
4240 * [`SystemTime::elapsed`]
4241 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
4242 * [`SystemTimeError`]
4243 * [`SystemTimeError::duration`]
4244 * Various impls for `SystemTimeError`
4246 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
4247 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
4248 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
4249 * [The `write!` and `writeln!` macros correctly emit errors if any of
4250 their arguments can't be formatted][1.8w].
4251 * [Various I/O functions support large files on 32-bit Linux][1.8l].
4252 * [The Unix-specific `raw` modules, which contain a number of
4253 redefined C types are deprecated][1.8r], including `os::raw::unix`,
4254 `os::raw::macos`, and `os::raw::linux`. These modules defined types
4255 such as `ino_t` and `dev_t`. The inconsistency of these definitions
4256 across platforms was making it difficult to implement `std`
4257 correctly. Those that need these definitions should use the `libc`
4259 * The Unix-specific `MetadataExt` traits, including
4260 `os::unix::fs::MetadataExt`, which expose values such as inode
4261 numbers [no longer return platform-specific types][1.8r], but
4262 instead return widened integers. [RFC 1415].
4263 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
4264 * [Atomic loads and stores are not volatile][1.8a].
4265 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
4270 * [Inlining hash functions lead to a 3% compile-time improvement in
4271 some workloads][1.8h].
4272 * When using jemalloc, its symbols are [unprefixed so that it
4273 overrides the libc malloc implementation][1.8h]. This means that for
4274 rustc, LLVM is now using jemalloc, which results in a 6%
4275 compile-time improvement on a specific workload.
4276 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
4281 * [32-bit MSVC builds finally implement unwinding][1.8ms].
4282 i686-pc-windows-msvc is now considered a tier-1 platform.
4283 * [The `--print targets` flag prints a list of supported targets][1.8t].
4284 * [The `--print cfg` flag prints the `cfg`s defined for the current
4286 * [`rustc` can be built with an new Cargo-based build system, written
4287 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
4288 build system. To enable it configure with `configure --rustbuild`.
4289 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
4290 variants while also indicating the total number of missing variants
4291 if more than 3][1.8m].
4292 * [Executable stacks are disabled on Linux and BSD][1.8nx].
4293 * The Rust Project now publishes binary releases of the standard
4294 library for a number of tier-2 targets:
4295 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
4296 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
4297 `x86_64-rumprun-netbsd`. These can be installed with
4298 tools such as [multirust][1.8mr].
4303 * [`cargo init` creates a new Cargo project in the current
4304 directory][1.8ci]. It is otherwise like `cargo new`.
4305 * [Cargo has configuration keys for `-v` and
4306 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
4307 `[term]` section of `.cargo/config`.
4308 * [Configuration keys that evaluate to strings or integers can be set
4309 via environment variables][1.8ce]. For example the `build.jobs` key
4310 can be set via `CARGO_BUILD_JOBS`. Environment variables take
4311 precedence over config files.
4312 * [Target-specific dependencies support Rust `cfg` syntax for
4313 describing targets][1.8cfg] so that dependencies for multiple
4314 targets can be specified together. [RFC 1361].
4315 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
4316 `RUSTDOC` take precedence over the `build.target-dir`,
4317 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
4318 * [The child process tree is killed on Windows when Cargo is
4320 * [The `build.target` configuration value sets the target platform,
4321 like `--target`][1.8ct].
4326 * [Unstable compiler flags have been further restricted][1.8u]. Since
4327 1.0 `-Z` flags have been considered unstable, and other flags that
4328 were considered unstable additionally required passing `-Z
4329 unstable-options` to access. Unlike unstable language and library
4330 features though, these options have been accessible on the stable
4331 release channel. Going forward, *new unstable flags will not be
4332 available on the stable release channel*, and old unstable flags
4333 will warn about their usage. In the future, all unstable flags will
4334 be unavailable on the stable release channel.
4335 * [It is no longer possible to `match` on empty enum variants using
4336 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
4337 * The Unix-specific `MetadataExt` traits, including
4338 `os::unix::fs::MetadataExt`, which expose values such as inode
4339 numbers [no longer return platform-specific types][1.8r], but
4340 instead return widened integers. [RFC 1415].
4341 * [Modules sourced from the filesystem cannot appear within arbitrary
4342 blocks, but only within other modules][1.8mf].
4343 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
4344 * On Unix, [stack overflow triggers a runtime abort instead of a
4346 * [`Command::spawn` and its equivalents return an error if any of
4347 its command-line arguments contain interior `NUL`s][1.8n].
4348 * [Tuple and unit enum variants from other crates are in the type
4350 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
4351 type instead of `.a` files][1.8st]. Additionally, for the MSVC
4352 toolchain, `rustc` emits import libraries named `foo.dll.lib`
4353 instead of `foo.lib`.
4356 [1.8a]: https://github.com/rust-lang/rust/pull/30962
4357 [1.8b]: https://github.com/rust-lang/rust/pull/31123
4358 [1.8c]: https://github.com/rust-lang/rust/pull/31530
4359 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
4360 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
4361 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
4362 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
4363 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
4364 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
4365 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
4366 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
4367 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
4368 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
4369 [1.8h]: https://github.com/rust-lang/rust/pull/31460
4370 [1.8l]: https://github.com/rust-lang/rust/pull/31668
4371 [1.8m]: https://github.com/rust-lang/rust/pull/31020
4372 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
4373 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
4374 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
4375 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
4376 [1.8n]: https://github.com/rust-lang/rust/pull/31056
4377 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
4378 [1.8r]: https://github.com/rust-lang/rust/pull/31551
4379 [1.8so]: https://github.com/rust-lang/rust/pull/31333
4380 [1.8st]: https://github.com/rust-lang/rust/pull/29520
4381 [1.8t]: https://github.com/rust-lang/rust/pull/31358
4382 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
4383 [1.8u]: https://github.com/rust-lang/rust/pull/31793
4384 [1.8v]: https://github.com/rust-lang/rust/pull/31757
4385 [1.8w]: https://github.com/rust-lang/rust/pull/31904
4386 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
4387 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
4388 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
4389 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
4390 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
4391 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
4392 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
4393 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
4394 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
4395 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
4396 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
4397 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
4398 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
4399 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
4400 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
4401 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
4402 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
4403 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
4404 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
4405 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
4406 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
4407 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
4408 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
4409 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
4410 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
4411 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
4412 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
4413 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
4414 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
4415 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
4418 Version 1.7.0 (2016-03-03)
4419 ==========================
4426 * [`Path::strip_prefix`][] (renamed from relative_from)
4427 * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
4429 * [`Ipv4Addr::is_loopback`]
4430 * [`Ipv4Addr::is_private`]
4431 * [`Ipv4Addr::is_link_local`]
4432 * [`Ipv4Addr::is_multicast`]
4433 * [`Ipv4Addr::is_broadcast`]
4434 * [`Ipv4Addr::is_documentation`]
4436 * [`Ipv6Addr::is_unspecified`]
4437 * [`Ipv6Addr::is_loopback`]
4438 * [`Ipv6Addr::is_multicast`]
4441 * [`Vec::as_mut_slice`]
4443 * [`String::as_str`]
4444 * [`String::as_mut_str`]
4446 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
4448 * `<[T]>::`[`sort_by_key`]
4449 * checked, saturated, and overflowing operations
4450 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
4451 * [`i32::saturating_mul`]
4452 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
4453 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
4454 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
4455 * [`u32::saturating_mul`]
4456 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
4457 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
4458 * and checked, saturated, and overflowing operations for other primitive types
4460 * [`ffi::IntoStringError`]
4461 * [`CString::into_string`]
4462 * [`CString::into_bytes`]
4463 * [`CString::into_bytes_with_nul`]
4464 * `From<CString> for Vec<u8>`
4466 * [`IntoStringError::into_cstring`]
4467 * [`IntoStringError::utf8_error`]
4468 * `Error for IntoStringError`
4470 * [`std::hash::BuildHasher`]
4471 * [`BuildHasher::Hasher`]
4472 * [`BuildHasher::build_hasher`]
4473 * [`std::hash::BuildHasherDefault`]
4474 * [`HashMap::with_hasher`]
4475 * [`HashMap::with_capacity_and_hasher`]
4476 * [`HashSet::with_hasher`]
4477 * [`HashSet::with_capacity_and_hasher`]
4478 * [`std::collections::hash_map::RandomState`]
4479 * [`RandomState::new`]
4480 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
4481 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
4482 from bytes is faster.
4483 * [The performance of `LineWriter` (and thus `io::stdout`) was
4484 improved by using `memchr` to search for newlines][1.7m].
4485 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
4486 `f64` variants were stabilized previously.
4487 * [`BTreeMap` was rewritten to use less memory and improve the performance
4488 of insertion and iteration, the latter by as much as 5x][1.7bm].
4489 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
4490 covariant over their contained type][1.7bt].
4491 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
4492 over their contained type][1.7ll].
4493 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
4495 * [`Any` is implemented for unsized types][1.7a].
4496 * [`Hash` is implemented for `Duration`][1.7h].
4501 * [When running tests with `--test`, rustdoc will pass `--cfg`
4502 arguments to the compiler][1.7dt].
4503 * [The compiler is built with RPATH information by default][1.7rpa].
4504 This means that it will be possible to run `rustc` when installed in
4505 unusual configurations without configuring the dynamic linker search
4507 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
4508 any RPATH entries (emitted with `-C rpath`) *not* take precedence
4509 over `LD_LIBRARY_PATH`.
4514 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
4515 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
4516 * [The `rerun-if-changed` build script directive no longer causes the
4517 build script to incorrectly run twice in certain scenarios][1.7rr].
4522 * Soundness fixes to the interactions between associated types and
4523 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
4524 code that violates the new rules. This is a significant change that
4525 is known to break existing code, so it has emitted warnings for the
4526 new error cases since 1.4 to give crate authors time to adapt. The
4527 details of what is changing are subtle; read the RFC for more.
4528 * [Several bugs in the compiler's visibility calculations were
4529 fixed][1.7v]. Since this was found to break significant amounts of
4530 code, the new errors will be emitted as warnings for several release
4531 cycles, under the `private_in_public` lint.
4532 * Defaulted type parameters were accidentally accepted in positions
4533 that were not intended. In this release, [defaulted type parameters
4534 appearing outside of type definitions will generate a
4535 warning][1.7d], which will become an error in future releases.
4536 * [Parsing "." as a float results in an error instead of 0][1.7p].
4537 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
4538 * [Borrows of closure parameters may not outlive the closure][1.7bc].
4540 [1.7a]: https://github.com/rust-lang/rust/pull/30928
4541 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
4542 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
4543 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
4544 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
4545 [1.7d]: https://github.com/rust-lang/rust/pull/30724
4546 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
4547 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
4548 [1.7f]: https://github.com/rust-lang/rust/pull/30672
4549 [1.7h]: https://github.com/rust-lang/rust/pull/30818
4550 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
4551 [1.7m]: https://github.com/rust-lang/rust/pull/30381
4552 [1.7p]: https://github.com/rust-lang/rust/pull/30681
4553 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
4554 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
4555 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
4556 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
4557 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
4558 [1.7v]: https://github.com/rust-lang/rust/pull/29973
4559 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4560 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
4561 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
4562 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
4563 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
4564 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
4565 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
4566 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
4567 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
4568 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
4569 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
4570 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
4571 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
4572 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
4573 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
4574 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
4575 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
4576 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
4577 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
4578 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
4579 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
4580 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
4581 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
4582 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
4583 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
4584 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
4585 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
4586 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
4587 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
4588 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
4589 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
4590 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
4591 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
4592 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
4593 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
4594 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
4595 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
4596 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
4597 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
4598 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
4599 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
4600 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
4601 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
4602 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
4603 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
4604 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
4605 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
4606 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4607 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
4608 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
4609 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
4610 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
4611 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
4612 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
4613 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
4614 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
4615 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
4616 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
4617 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
4618 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
4621 Version 1.6.0 (2016-01-21)
4622 ==========================
4627 * The `#![no_std]` attribute causes a crate to not be linked to the
4628 standard library, but only the [core library][1.6co], as described
4629 in [RFC 1184]. The core library defines common types and traits but
4630 has no platform dependencies whatsoever, and is the basis for Rust
4631 software in environments that cannot support a full port of the
4632 standard library, such as operating systems. Most of the core
4633 library is now stable.
4639 [`Read::read_exact`],
4640 [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
4641 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
4642 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
4643 [`os::unix::fs::DirBuilderExt`],
4644 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
4645 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
4646 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
4647 [`collections::hash_map::Drain`],
4648 [`collections::hash_map::HashMap::drain`],
4649 [`collections::hash_set::Drain`],
4650 [`collections::hash_set::HashSet::drain`],
4651 [`collections::binary_heap::Drain`],
4652 [`collections::binary_heap::BinaryHeap::drain`],
4653 [`Vec::extend_from_slice`][] (renamed from `push_all`),
4654 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
4655 [`RwLock::into_inner`],
4656 [`Iterator::min_by_key`][] (renamed from `min_by`),
4657 [`Iterator::max_by_key`][] (renamed from `max_by`).
4658 * The [core library][1.6co] is stable, as are most of its APIs.
4659 * [The `assert_eq!` macro supports arguments that don't implement
4660 `Sized`][1.6ae], such as arrays. In this way it behaves more like
4662 * Several timer functions that take duration in milliseconds [are
4663 deprecated in favor of those that take `Duration`][1.6ms]. These
4664 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
4665 `thread::park_timeout_ms`.
4666 * The algorithm by which `Vec` reserves additional elements was
4667 [tweaked to not allocate excessive space][1.6a] while still growing
4669 * `From` conversions are [implemented from integers to floats][1.6f]
4670 in cases where the conversion is lossless. Thus they are not
4671 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
4672 or `f64`. They are also not implemented for `isize` and `usize`
4673 because the implementations would be platform-specific. `From` is
4674 also implemented from `f32` to `f64`.
4675 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
4676 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
4677 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
4678 * [`BinaryHeap` was refactored][1.6bh] for modest performance
4680 * Sorting slices that are already sorted [is 50% faster in some
4686 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
4687 * Cargo build scripts can specify their dependencies by emitting the
4688 [`rerun-if-changed`][1.6rr] key.
4689 * crates.io will reject publication of crates with dependencies that
4690 have a wildcard version constraint. Crates with wildcard
4691 dependencies were seen to cause a variety of problems, as described
4692 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
4694 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
4695 release folder. A variety of artifacts that Cargo failed to clean
4696 are now correctly deleted.
4701 * The `unreachable_code` lint [warns when a function call's argument
4703 * The parser indicates [failures that may be caused by
4704 confusingly-similar Unicode characters][1.6uc]
4705 * Certain macro errors [are reported at definition time][1.6m], not
4711 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
4712 environment variable when locating crates. This was a pre-cargo
4713 feature for integrating with the package manager that was
4714 accidentally never removed.
4715 * [A number of bugs were fixed in the privacy checker][1.6p] that
4716 could cause previously-accepted code to break.
4717 * [Modules and unit/tuple structs may not share the same name][1.6ts].
4718 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
4719 struct pattern syntax (`Foo(..)`) can no longer be used to match
4720 unit structs. This is a warning now, but will become an error in
4721 future releases. Patterns that share the same name as a const are
4723 * A bug was fixed that causes [rustc not to apply default type
4724 parameters][1.6xc] when resolving certain method implementations of
4725 traits defined in other crates.
4727 [1.6a]: https://github.com/rust-lang/rust/pull/29454
4728 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
4729 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
4730 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
4731 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
4732 [1.6co]: http://doc.rust-lang.org/core/index.html
4733 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
4734 [1.6f]: https://github.com/rust-lang/rust/pull/29129
4735 [1.6m]: https://github.com/rust-lang/rust/pull/29828
4736 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
4737 [1.6p]: https://github.com/rust-lang/rust/pull/29726
4738 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
4739 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
4740 [1.6s]: https://github.com/rust-lang/rust/pull/29675
4741 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
4742 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
4743 [1.6us]: https://github.com/rust-lang/rust/pull/29383
4744 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
4745 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
4746 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4747 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
4748 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
4749 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
4750 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
4751 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
4752 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
4753 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
4754 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
4755 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
4756 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
4757 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
4758 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
4759 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
4760 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
4761 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
4762 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
4763 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
4764 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
4765 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
4766 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
4767 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
4768 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
4769 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
4770 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
4771 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
4772 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
4773 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
4776 Version 1.5.0 (2015-12-10)
4777 ==========================
4779 * ~700 changes, numerous bugfixes
4785 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
4786 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
4787 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
4788 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
4789 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
4790 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
4791 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
4792 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
4793 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
4794 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
4795 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
4796 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
4797 [`Path::read_link`], [`Path::symlink_metadata`],
4798 [`Utf8Error::valid_up_to`], [`Vec::resize`],
4799 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
4800 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
4801 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
4802 [`slice::split_first_mut`], [`slice::split_first`],
4803 [`slice::split_last_mut`], [`slice::split_last`],
4804 [`char::from_u32_unchecked`], [`fs::canonicalize`],
4805 [`str::MatchIndices`], [`str::RMatchIndices`],
4806 [`str::match_indices`], [`str::rmatch_indices`],
4807 [`str::slice_mut_unchecked`], [`string::ParseError`].
4808 * Rust applications hosted on crates.io can be installed locally to
4809 `~/.cargo/bin` with the [`cargo install`] command. Among other
4810 things this makes it easier to augment Cargo with new subcommands:
4811 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
4812 invoked as `cargo foo`.
4813 * Crates with wildcard (`*`) dependencies will [emit warnings when
4814 published][1.5w]. In 1.6 it will no longer be possible to publish
4815 crates with wildcard dependencies.
4820 * The rules determining when a particular lifetime must outlive
4821 a particular value (known as '[dropck]') have been [modified
4822 to not rely on parametricity][1.5p].
4823 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
4824 and `Arc`][1.5a]. Because these smart pointer types implement
4825 `Deref`, this causes breakage in cases where the interior type
4826 contains methods of the same name.
4827 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
4828 that they could drop their content. Soundness fix.
4829 * All method invocations are [properly checked][1.5wf1] for
4830 [well-formedness][1.5wf2]. Soundness fix.
4831 * Traits whose supertraits contain `Self` are [not object
4832 safe][1.5o]. Soundness fix.
4833 * Target specifications support a [`no_default_libraries`][1.5nd]
4834 setting that controls whether `-nodefaultlibs` is passed to the
4835 linker, and in turn the `is_like_windows` setting no longer affects
4836 the `-nodefaultlibs` flag.
4837 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
4838 * The `#[inline]` and `#[repr]` attributes [can only appear
4839 in valid locations][1.5at].
4840 * Native libraries linked from the local crate are [passed to
4841 the linker before native libraries from upstream crates][1.5nl].
4842 * Two rarely-used attributes, `#[no_debug]` and
4843 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
4844 * Negation of unsigned integers, which has been a warning for
4845 several releases, [is now behind a feature gate and will
4846 generate errors][1.5nu].
4847 * The parser accidentally accepted visibility modifiers on
4848 enum variants, a bug [which has been fixed][1.5ev].
4849 * [A bug was fixed that allowed `use` statements to import unstable
4855 * When evaluating expressions at compile-time that are not
4856 compile-time constants (const-evaluating expressions in non-const
4857 contexts), incorrect code such as overlong bitshifts and arithmetic
4858 overflow will [generate a warning instead of an error][1.5ce],
4859 delaying the error until runtime. This will allow the
4860 const-evaluator to be expanded in the future backwards-compatibly.
4861 * The `improper_ctypes` lint [no longer warns about using `isize` and
4862 `usize` in FFI][1.5ict].
4867 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
4869 * `Default` is [implemented for mutable slices][1.5d].
4870 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
4871 * There are now `From` conversions [between floating point
4872 types][1.5f] where the conversions are lossless.
4873 * There are now `From` conversions [between integer types][1.5i] where
4874 the conversions are lossless.
4875 * [`fs::Metadata` implements `Clone`][1.5fs].
4876 * The `parse` method [accepts a leading "+" when parsing
4878 * [`AsMut` is implemented for `Vec`][1.5am].
4879 * The `clone_from` implementations for `String` and `BinaryHeap` [have
4880 been optimized][1.5cf] and no longer rely on the default impl.
4881 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
4882 `unsafe extern "C"` function types now [implement `Clone`,
4883 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
4884 `fmt::Debug` for up to 12 arguments][1.5fp].
4885 * [Dropping `Vec`s is much faster in unoptimized builds when the
4886 element types don't implement `Drop`][1.5dv].
4887 * A bug that caused in incorrect behavior when [combining `VecDeque`
4888 with zero-sized types][1.5vdz] was resolved.
4889 * [`PartialOrd` for slices is faster][1.5po].
4894 * [Crate metadata size was reduced by 20%][1.5md].
4895 * [Improvements to code generation reduced the size of libcore by 3.3
4896 MB and rustc's memory usage by 18MB][1.5m].
4897 * [Improvements to deref translation increased performance in
4898 unoptimized builds][1.5dr].
4899 * Various errors in trait resolution [are deduplicated to only be
4900 reported once][1.5te].
4901 * Rust has preliminary [support for rumprun kernels][1.5rr].
4902 * Rust has preliminary [support for NetBSD on amd64][1.5na].
4904 [1.5use]: https://github.com/rust-lang/rust/pull/28364
4905 [1.5po]: https://github.com/rust-lang/rust/pull/28436
4906 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
4907 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
4908 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
4909 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
4910 [1.5md]: https://github.com/rust-lang/rust/pull/28521
4911 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
4912 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
4913 [1.5na]: https://github.com/rust-lang/rust/pull/28543
4914 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
4915 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
4916 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
4917 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
4918 [1.5te]: https://github.com/rust-lang/rust/pull/28645
4919 [1.5at]: https://github.com/rust-lang/rust/pull/28650
4920 [1.5am]: https://github.com/rust-lang/rust/pull/28663
4921 [1.5m]: https://github.com/rust-lang/rust/pull/28778
4922 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
4923 [1.5a]: https://github.com/rust-lang/rust/pull/28811
4924 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
4925 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
4926 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
4927 [1.5i]: https://github.com/rust-lang/rust/pull/28921
4928 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
4929 [1.5f]: https://github.com/rust-lang/rust/pull/29129
4930 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
4931 [1.5s]: https://github.com/rust-lang/rust/pull/29190
4932 [1.5d]: https://github.com/rust-lang/rust/pull/29245
4933 [1.5o]: https://github.com/rust-lang/rust/pull/29259
4934 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
4935 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
4936 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
4937 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
4938 [1.5c]: https://github.com/rust-lang/rust/pull/29110
4939 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
4940 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
4941 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
4942 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
4943 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
4944 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
4945 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
4946 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
4947 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
4948 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
4949 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
4950 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
4951 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
4952 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
4953 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
4954 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
4955 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
4956 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
4957 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
4958 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
4959 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
4960 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
4961 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
4962 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
4963 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
4964 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
4965 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
4966 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
4967 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
4968 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
4969 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
4970 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
4971 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
4972 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
4973 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
4974 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
4975 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
4976 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
4977 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
4978 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
4979 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
4980 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
4981 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
4982 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
4983 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
4984 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
4985 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
4986 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
4987 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
4988 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
4989 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
4990 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
4991 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
4992 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
4994 Version 1.4.0 (2015-10-29)
4995 ==========================
4997 * ~1200 changes, numerous bugfixes
5002 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
5003 GNU) are now supported and recommended for use.
5008 * [Several changes have been made to fix type soundness and improve
5009 the behavior of associated types][sound]. See [RFC 1214]. Although
5010 we have mostly introduced these changes as warnings this release, to
5011 become errors next release, there are still some scenarios that will
5012 see immediate breakage.
5013 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
5014 line breaks in addition to `\n`][crlf].
5015 * [Loans of `'static` lifetime extend to the end of a function][stat].
5016 * [`str::parse` no longer introduces avoidable rounding error when
5017 parsing floating point numbers. Together with earlier changes to
5018 float formatting/output, "round trips" like f.to_string().parse()
5019 now preserve the value of f exactly. Additionally, leading plus
5020 signs are now accepted][fp3].
5026 * `use` statements that import multiple items [can now rename
5027 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
5028 * [Binops work correctly on fat pointers][binfat].
5029 * `pub extern crate`, which does not behave as expected, [issues a
5030 warning][pec] until a better solution is found.
5035 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
5036 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
5037 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
5038 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
5039 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
5040 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
5041 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
5042 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
5043 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
5044 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
5045 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
5046 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
5047 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
5048 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
5049 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
5050 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
5051 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
5052 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
5054 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
5055 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
5056 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
5057 `f64::from_str_radix`.
5058 * [Reverse-searching strings is faster with the 'two-way'
5060 * [`std::io::copy` allows `?Sized` arguments][cc].
5061 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
5062 [override `count`, `nth` and `last` with an O(1)
5063 implementation][it].
5064 * [`Default` is implemented for arrays up to `[T; 32]`][d].
5065 * [`IntoRawFd` has been added to the Unix-specific prelude,
5066 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
5068 * [`Extend<String>` and `FromIterator<String` are both implemented for
5070 * [`IntoIterator` is implemented for references to `Option` and
5072 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
5073 Copy`][ext] as part of [RFC 839]. This will cause type inference
5074 breakage in rare situations.
5075 * [`BinaryHeap` implements `Debug`][bh2].
5076 * [`Borrow` and `BorrowMut` are implemented for fixed-size
5078 * [`extern fn`s with the "Rust" and "C" ABIs implement common
5079 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
5080 * [String comparison is faster][faststr].
5081 * `&mut T` where `T: std::fmt::Write` [also implements
5082 `std::fmt::Write`][mutw].
5083 * [A stable regression in `VecDeque::push_back` and other
5084 capacity-altering methods that caused panics for zero-sized types
5086 * [Function pointers implement traits for up to 12 parameters][fp2].
5091 * The compiler [no longer uses the 'morestack' feature to prevent
5092 stack overflow][mm]. Instead it uses guard pages and stack
5093 probes (though stack probes are not yet implemented on any platform
5095 * [The compiler matches traits faster when projections are involved][p].
5096 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
5098 * [Cargo now displays useful information about what its doing during
5099 `cargo update`][cu].
5101 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
5102 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
5103 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
5104 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
5105 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
5106 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
5107 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
5108 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
5109 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
5110 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
5111 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
5112 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
5113 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
5114 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
5115 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
5116 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
5117 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
5118 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
5119 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5120 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5121 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5122 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5123 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
5124 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
5125 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
5126 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
5127 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
5128 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
5129 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
5130 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
5131 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
5132 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
5133 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
5134 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
5135 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
5136 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
5137 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
5138 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
5139 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
5140 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
5141 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
5142 [bh2]: https://github.com/rust-lang/rust/pull/28156
5143 [binfat]: https://github.com/rust-lang/rust/pull/28270
5144 [bm]: https://github.com/rust-lang/rust/pull/28197
5145 [cc]: https://github.com/rust-lang/rust/pull/27531
5146 [crlf]: https://github.com/rust-lang/rust/pull/28034
5147 [cu]: https://github.com/rust-lang/cargo/pull/1931
5148 [d]: https://github.com/rust-lang/rust/pull/27825
5149 [dep]: https://github.com/rust-lang/rust/pull/28339
5150 [es]: https://github.com/rust-lang/rust/pull/27956
5151 [ext]: https://github.com/rust-lang/rust/pull/28094
5152 [faststr]: https://github.com/rust-lang/rust/pull/28338
5153 [ffi]: https://github.com/rust-lang/rust/pull/28779
5154 [fp]: https://github.com/rust-lang/rust/pull/28268
5155 [fp2]: https://github.com/rust-lang/rust/pull/28560
5156 [fp3]: https://github.com/rust-lang/rust/pull/27307
5157 [i]: https://github.com/rust-lang/rust/pull/27451
5158 [into2]: https://github.com/rust-lang/rust/pull/28039
5159 [it]: https://github.com/rust-lang/rust/pull/27652
5160 [mm]: https://github.com/rust-lang/rust/pull/27338
5161 [mutw]: https://github.com/rust-lang/rust/pull/28368
5162 [sound]: https://github.com/rust-lang/rust/pull/27641
5163 [p]: https://github.com/rust-lang/rust/pull/27866
5164 [pec]: https://github.com/rust-lang/rust/pull/28486
5165 [pr]: https://github.com/rust-lang/rust/pull/27896
5166 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5167 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5168 [s]: https://github.com/rust-lang/rust/pull/27474
5169 [stab]: https://github.com/rust-lang/rust/pull/28339
5170 [stat]: https://github.com/rust-lang/rust/pull/28321
5171 [vd]: https://github.com/rust-lang/rust/pull/28494
5173 Version 1.3.0 (2015-09-17)
5174 ==============================
5176 * ~900 changes, numerous bugfixes
5181 * The [new object lifetime defaults][nold] have been [turned
5182 on][nold2] after a cycle of warnings about the change. Now types
5183 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
5184 being interpreted as `&'a Box<Trait+'a>` to `&'a
5185 Box<Trait+'static>`.
5186 * [The Rustonomicon][nom] is a new book in the official documentation
5187 that dives into writing unsafe Rust.
5188 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
5189 timekeeping is employed by other std APIs, as well as out-of-tree
5195 * The [new object lifetime defaults][nold] have been [turned
5196 on][nold2] after a cycle of warnings about the change.
5197 * There is a known [regression][lr] in how object lifetime elision is
5198 interpreted, the proper solution for which is undetermined.
5199 * The `#[prelude_import]` attribute, an internal implementation
5200 detail, was accidentally stabilized previously. [It has been put
5201 behind the `prelude_import` feature gate][pi]. This change is
5202 believed to break no existing code.
5203 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5204 [more sane for dynamically sized types][dst3]. Code that relied on
5205 the previous behavior is thought to be broken.
5206 * The `dropck` rules, which checks that destructors can't access
5207 destroyed values, [have been updated][dropck] to match the
5208 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
5209 cause some previously-compiling code to no longer build.
5214 * The [new object lifetime defaults][nold] have been [turned
5215 on][nold2] after a cycle of warnings about the change.
5216 * Semicolons may [now follow types and paths in
5217 macros](https://github.com/rust-lang/rust/pull/27000).
5218 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
5219 [more sane for dynamically sized types][dst3]. Code that relied on
5220 the previous behavior is not known to exist, and suspected to be
5222 * `'static` variables [may now be recursive][st].
5223 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
5224 implementations correctly.
5225 * The `dropck` rules, which checks that destructors can't access
5226 destroyed values, [have been updated][dropck] to match the
5232 * The [`Duration`] API, [has been stabilized][ds], as well as the
5233 `std::time` module, which presently contains only `Duration`.
5234 * `Box<str>` and `Box<[T]>` both implement `Clone`.
5235 * The owned C string, [`CString`], implements [`Borrow`] and the
5236 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
5237 these allow C strings to be borrowed and cloned in generic code.
5238 * [`CStr`] implements [`Debug`].
5239 * [`AtomicPtr`] implements [`Debug`].
5240 * [`Error`] trait objects [can be downcast to their concrete types][e]
5241 in many common configurations, using the [`is`], [`downcast`],
5242 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
5244 * Searching for substrings now [employs the two-way algorithm][search]
5245 instead of doing a naive search. This gives major speedups to a
5246 number of methods, including [`contains`][sc], [`find`][sf],
5247 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
5248 [`ends_with`][sew] are also faster.
5249 * The performance of `PartialEq` for slices is [much faster][ps].
5250 * The [`Hash`] trait offers the default method, [`hash_slice`], which
5251 is overridden and optimized by the implementations for scalars.
5252 * The [`Hasher`] trait now has a number of specialized `write_*`
5253 methods for primitive types, for efficiency.
5254 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
5255 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
5256 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
5257 of [`std::error::Error::cause`][iec] also delegates to the inner
5259 * [`process::Child`][pc] gained the [`id`] method, which returns a
5260 `u32` representing the platform-specific process identifier.
5261 * The [`connect`] method on slices is deprecated, replaced by the new
5262 [`join`] method (note that both of these are on the *unstable*
5263 [`SliceConcatExt`] trait, but through the magic of the prelude are
5264 available to stable code anyway).
5265 * The [`Div`] operator is implemented for [`Wrapping`] types.
5266 * [`DerefMut` is implemented for `String`][dms].
5267 * Performance of SipHash (the default hasher for `HashMap`) is
5268 [better for long data][sh].
5269 * [`AtomicPtr`] implements [`Send`].
5270 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
5271 are now [specialized to use uninitialized buffers for increased
5273 * Lifetime parameters of foreign functions [are now resolved
5279 * Rust can now, with some coercion, [produce programs that run on
5280 Windows XP][xp], though XP is not considered a supported platform.
5281 * Porting Rust on Windows from the GNU toolchain to MSVC continues
5282 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
5283 recommended for use in 1.3, though should be fully-functional
5284 in the [64-bit 1.4 beta][b14].
5285 * On Fedora-based systems installation will [properly configure the
5286 dynamic linker][fl].
5287 * The compiler gained many new extended error descriptions, which can
5288 be accessed with the `--explain` flag.
5289 * The `dropck` pass, which checks that destructors can't access
5290 destroyed values, [has been rewritten][dropck]. This fixes some
5291 soundness holes, and as such will cause some previously-compiling
5292 code to no longer build.
5293 * `rustc` now uses [LLVM to write archive files where possible][ar].
5294 Eventually this will eliminate the compiler's dependency on the ar
5296 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
5297 supported FreeBSD on x86_64).
5298 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
5299 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
5301 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
5302 will kill the process instead of leaking][nlp].
5304 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
5305 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
5306 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
5307 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
5308 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
5309 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5310 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5311 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
5312 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
5313 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
5314 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
5315 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
5316 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
5317 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5318 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
5319 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
5320 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
5321 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
5322 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5323 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
5324 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
5325 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
5326 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
5327 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5328 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
5329 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
5330 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
5331 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
5332 [ar]: https://github.com/rust-lang/rust/pull/26926
5333 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
5334 [dms]: https://github.com/rust-lang/rust/pull/26241
5335 [dropck]: https://github.com/rust-lang/rust/pull/27261
5336 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5337 [ds]: https://github.com/rust-lang/rust/pull/26818
5338 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
5339 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
5340 [dst3]: https://github.com/rust-lang/rust/pull/27351
5341 [e]: https://github.com/rust-lang/rust/pull/24793
5342 [f]: https://github.com/rust-lang/rust/pull/26588
5343 [fb]: https://github.com/rust-lang/rust/pull/26959
5344 [fl]: https://github.com/rust-lang/rust-installer/pull/41
5345 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
5346 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
5347 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
5348 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
5349 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
5350 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
5351 [lic]: https://github.com/rust-lang/rust/pull/26583
5352 [lnu]: https://github.com/rust-lang/rust/pull/27026
5353 [lr]: https://github.com/rust-lang/rust/issues/27248
5354 [lum]: https://github.com/rust-lang/rust/pull/26378
5355 [lur]: https://github.com/rust-lang/rust/pull/26783
5356 [nlp]: https://github.com/rust-lang/rust/pull/27176
5357 [nold2]: https://github.com/rust-lang/rust/pull/27045
5358 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
5359 [nom]: http://doc.rust-lang.org/nightly/nomicon/
5360 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
5361 [pi]: https://github.com/rust-lang/rust/pull/26699
5362 [ps]: https://github.com/rust-lang/rust/pull/26884
5363 [rte]: https://github.com/rust-lang/rust/pull/26950
5364 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
5365 [search]: https://github.com/rust-lang/rust/pull/26327
5366 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
5367 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
5368 [sh]: https://github.com/rust-lang/rust/pull/27280
5369 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
5370 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
5371 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
5372 [st]: https://github.com/rust-lang/rust/pull/26630
5373 [win1]: https://github.com/rust-lang/rust/pull/26569
5374 [win2]: https://github.com/rust-lang/rust/pull/26741
5375 [win3]: https://github.com/rust-lang/rust/pull/26741
5376 [win4]: https://github.com/rust-lang/rust/pull/27210
5377 [xp]: https://github.com/rust-lang/rust/pull/26569
5379 Version 1.2.0 (2015-08-07)
5380 ==========================
5382 * ~1200 changes, numerous bugfixes
5387 * [Dynamically-sized-type coercions][dst] allow smart pointer types
5388 like `Rc` to contain types without a fixed size, arrays and trait
5389 objects, finally enabling use of `Rc<[T]>` and completing the
5390 implementation of DST.
5391 * [Parallel codegen][parcodegen] is now working again, which can
5392 substantially speed up large builds in debug mode; It also gets
5393 another ~33% speedup when bootstrapping on a 4 core machine (using 8
5394 jobs). It's not enabled by default, but will be "in the near
5395 future". It can be activated with the `-C codegen-units=N` flag to
5397 * This is the first release with [experimental support for linking
5398 with the MSVC linker and lib C on Windows (instead of using the GNU
5399 variants via MinGW)][win]. It is yet recommended only for the most
5400 intrepid Rustaceans.
5401 * Benchmark compilations are showing a 30% improvement in
5402 bootstrapping over 1.1.
5407 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
5408 unicode case mapping, which is a previously-planned change in
5409 behavior and considered a bugfix.
5410 * [`mem::align_of`] now specifies [the *minimum alignment* for
5411 T][align], which is usually the alignment programs are interested
5412 in, and the same value reported by clang's
5413 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
5415 * [The `#[packed]` attribute is no longer silently accepted by the
5416 compiler][packed]. This attribute did nothing and code that
5417 mentioned it likely did not work as intended.
5418 * Associated type defaults are [now behind the
5419 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
5420 defaults *did not work*, but could be mentioned syntactically. As
5421 such this breakage has minimal impact.
5426 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
5427 matching against dereferenceable values.
5432 * The [`Extend`] trait, which grows a collection from an iterator, is
5433 implemented over iterators of references, for `String`, `Vec`,
5434 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
5435 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
5436 * The [`iter::once`] function returns an iterator that yields a single
5437 element, and [`iter::empty`] returns an iterator that yields no
5439 * The [`matches`] and [`rmatches`] methods on `str` return iterators
5440 over substring matches.
5441 * [`Cell`] and [`RefCell`] both implement `Eq`.
5442 * A number of methods for wrapping arithmetic are added to the
5443 integral types, [`wrapping_div`], [`wrapping_rem`],
5444 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
5445 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
5446 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
5447 type.. It is illegal for the default arithmetic operations in Rust
5448 to overflow; the desire to wrap must be explicit.
5449 * The `{:#?}` formatting specifier [displays the alternate,
5450 pretty-printed][debugfmt] form of the `Debug` formatter. This
5451 feature was actually introduced prior to 1.0 with little
5453 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
5454 for writing data to formatted strings, similar to [`io::Write`].
5455 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
5456 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
5457 are used by code generators to emit implementations of [`Debug`].
5458 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
5459 methods that convert case, following Unicode case mapping.
5460 * It is now easier to handle poisoned locks. The [`PoisonError`]
5461 type, returned by failing lock operations, exposes `into_inner`,
5462 `get_ref`, and `get_mut`, which all give access to the inner lock
5463 guard, and allow the poisoned lock to continue to operate. The
5464 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
5465 poisoned lock without attempting to take the lock.
5466 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
5467 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
5468 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
5469 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
5471 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
5477 * `rustc` employs smarter heuristics for guessing at [typos].
5478 * `rustc` emits more efficient code for [no-op conversions between
5479 unsafe pointers][nop].
5480 * Fat pointers are now [passed in pairs of immediate arguments][fat],
5481 resulting in faster compile times and smaller code.
5483 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
5484 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
5485 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
5486 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
5487 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
5488 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
5489 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
5490 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
5491 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
5492 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
5493 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
5494 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
5495 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
5496 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
5497 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
5498 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
5499 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
5500 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
5501 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
5502 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
5503 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
5504 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
5505 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
5506 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
5507 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
5508 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
5509 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
5510 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
5511 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
5512 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
5513 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
5514 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
5515 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
5516 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5517 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5518 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
5519 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
5520 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
5521 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
5522 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
5523 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
5524 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
5525 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
5526 [align]: https://github.com/rust-lang/rust/pull/25646
5527 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
5528 [typos]: https://github.com/rust-lang/rust/pull/26087
5529 [nop]: https://github.com/rust-lang/rust/pull/26336
5530 [fat]: https://github.com/rust-lang/rust/pull/26411
5531 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
5532 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
5533 [packed]: https://github.com/rust-lang/rust/pull/25541
5534 [ad]: https://github.com/rust-lang/rust/pull/27382
5535 [win]: https://github.com/rust-lang/rust/pull/25350
5537 Version 1.1.0 (2015-06-25)
5538 =========================
5540 * ~850 changes, numerous bugfixes
5545 * The [`std::fs` module has been expanded][fs] to expand the set of
5546 functionality exposed:
5547 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
5548 don't incur a syscall on some platforms.
5549 * A `symlink_metadata` function has been added.
5550 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
5551 access to all underlying information.
5552 * The compiler now contains extended explanations of many errors. When an error
5553 with an explanation occurs the compiler suggests using the `--explain` flag
5554 to read the explanation. Error explanations are also [available online][err-index].
5555 * Thanks to multiple [improvements][sk] to [type checking][pre], as
5556 well as other work, the time to bootstrap the compiler decreased by
5562 * The [`str::split_whitespace`] method splits a string on unicode
5563 whitespace boundaries.
5564 * On both Windows and Unix, new extension traits provide conversion of
5565 I/O types to and from the underlying system handles. On Unix, these
5566 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
5567 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
5568 `TcpListener`, and `UpdSocket`. Further implementations for
5569 `std::process` will be stabilized later.
5570 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
5571 Windows, symlinks can be created with
5572 `std::os::windows::symlink_dir` and
5573 `std::os::windows::symlink_file`.
5574 * The `mpsc::Receiver` type can now be converted into an iterator with
5575 `into_iter` on the [`IntoIterator`] trait.
5576 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
5577 implementation of the [`From`] trait.
5578 * The `Debug` implementation for `RangeFull` [creates output that is
5579 more consistent with other implementations][rf].
5580 * [`Debug` is implemented for `File`][file].
5581 * The `Default` implementation for `Arc` [no longer requires `Sync +
5583 * [The `Iterator` methods `count`, `nth`, and `last` have been
5584 overridden for slices to have O(1) performance instead of O(n)][si].
5585 * Incorrect handling of paths on Windows has been improved in both the
5586 compiler and the standard library.
5587 * [`AtomicPtr` gained a `Default` implementation][ap].
5588 * In accordance with Rust's policy on arithmetic overflow `abs` now
5589 [panics on overflow when debug assertions are enabled][abs].
5590 * The [`Cloned`] iterator, which was accidentally left unstable for
5591 1.0 [has been stabilized][c].
5592 * The [`Incoming`] iterator, which iterates over incoming TCP
5593 connections, and which was accidentally unnamable in 1.0, [is now
5594 properly exported][inc].
5595 * [`BinaryHeap`] no longer corrupts itself [when functions called by
5596 `sift_up` or `sift_down` panic][bh].
5597 * The [`split_off`] method of `LinkedList` [no longer corrupts
5598 the list in certain scenarios][ll].
5603 * Type checking performance [has improved notably][sk] with
5604 [multiple improvements][pre].
5605 * The compiler [suggests code changes][ch] for more errors.
5606 * rustc and it's build system have experimental support for [building
5607 toolchains against MUSL][m] instead of glibc on Linux.
5608 * The compiler defines the `target_env` cfg value, which is used for
5609 distinguishing toolchains that are otherwise for the same
5610 platform. Presently this is set to `gnu` for common GNU Linux
5611 targets and for MinGW targets, and `musl` for MUSL Linux targets.
5612 * The [`cargo rustc`][crc] command invokes a build with custom flags
5614 * [Android executables are always position independent][pie].
5615 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
5618 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
5619 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
5620 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
5621 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
5622 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
5623 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
5624 [rf]: https://github.com/rust-lang/rust/pull/24491
5625 [err-index]: https://doc.rust-lang.org/error-index.html
5626 [sk]: https://github.com/rust-lang/rust/pull/24615
5627 [pre]: https://github.com/rust-lang/rust/pull/25323
5628 [file]: https://github.com/rust-lang/rust/pull/24598
5629 [ch]: https://github.com/rust-lang/rust/pull/24683
5630 [arc]: https://github.com/rust-lang/rust/pull/24695
5631 [si]: https://github.com/rust-lang/rust/pull/24701
5632 [ap]: https://github.com/rust-lang/rust/pull/24834
5633 [m]: https://github.com/rust-lang/rust/pull/24777
5634 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
5635 [crc]: https://github.com/rust-lang/cargo/pull/1568
5636 [pie]: https://github.com/rust-lang/rust/pull/24953
5637 [abs]: https://github.com/rust-lang/rust/pull/25441
5638 [c]: https://github.com/rust-lang/rust/pull/25496
5639 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
5640 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
5641 [inc]: https://github.com/rust-lang/rust/pull/25522
5642 [bh]: https://github.com/rust-lang/rust/pull/25856
5643 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
5644 [ll]: https://github.com/rust-lang/rust/pull/26022
5645 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
5646 [drop]: https://github.com/rust-lang/rust/pull/24935
5648 Version 1.0.0 (2015-05-15)
5649 ========================
5651 * ~1500 changes, numerous bugfixes
5656 * The vast majority of the standard library is now `#[stable]`. It is
5657 no longer possible to use unstable features with a stable build of
5659 * Many popular crates on [crates.io] now work on the stable release
5661 * Arithmetic on basic integer types now [checks for overflow in debug
5667 * Several [restrictions have been added to trait coherence][coh] in
5668 order to make it easier for upstream authors to change traits
5669 without breaking downstream code.
5670 * Digits of binary and octal literals are [lexed more eagerly][lex] to
5671 improve error messages and macro behavior. For example, `0b1234` is
5672 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
5673 * Trait bounds [are always invariant][inv], eliminating the need for
5674 the `PhantomFn` and `MarkerTrait` lang items, which have been
5676 * ["-" is no longer a valid character in crate names][cr], the `extern crate
5677 "foo" as bar` syntax has been replaced with `extern crate foo as
5678 bar`, and Cargo now automatically translates "-" in *package* names
5679 to underscore for the crate name.
5680 * [Lifetime shadowing is an error][lt].
5681 * [`Send` no longer implies `'static`][send-rfc].
5682 * [UFCS now supports trait-less associated paths][moar-ufcs] like
5683 `MyType::default()`.
5684 * Primitive types [now have inherent methods][prim-inherent],
5685 obviating the need for extension traits like `SliceExt`.
5686 * Methods with `Self: Sized` in their `where` clause are [considered
5687 object-safe][self-sized], allowing many extension traits like
5688 `IteratorExt` to be merged into the traits they extended.
5689 * You can now [refer to associated types][assoc-where] whose
5690 corresponding trait bounds appear only in a `where` clause.
5691 * The final bits of [OIBIT landed][oibit-final], meaning that traits
5692 like `Send` and `Sync` are now library-defined.
5693 * A [Reflect trait][reflect] was introduced, which means that
5694 downcasting via the `Any` trait is effectively limited to concrete
5695 types. This helps retain the potentially-important "parametricity"
5696 property: generic code cannot behave differently for different type
5697 arguments except in minor ways.
5698 * The `unsafe_destructor` feature is now deprecated in favor of the
5699 [new `dropck`][dropck]. This change is a major reduction in unsafe
5705 * The `thread_local` module [has been renamed to `std::thread`][th].
5706 * The methods of `IteratorExt` [have been moved to the `Iterator`
5708 * Several traits that implement Rust's conventions for type
5709 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
5710 [centralized in the `std::convert` module][con].
5711 * The `FromError` trait [was removed in favor of `From`][fe].
5712 * The basic sleep function [has moved to
5713 `std::thread::sleep_ms`][slp].
5714 * The `splitn` function now takes an `n` parameter that represents the
5715 number of items yielded by the returned iterator [instead of the
5716 number of 'splits'][spl].
5717 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
5718 * [Derived implementations of `PartialOrd` now order enums according
5719 to their explicitly-assigned discriminants][po].
5720 * [Methods for searching strings are generic over `Pattern`s][pat],
5721 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
5723 * [In method resolution, object methods are resolved before inherent
5725 * [`String::from_str` has been deprecated in favor of the `From` impl,
5726 `String::from`][sf].
5727 * [`io::Error` implements `Sync`][ios].
5728 * [The `words` method on `&str` has been replaced with
5729 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
5731 * The new path and IO modules are complete and `#[stable]`. This
5732 was the major library focus for this cycle.
5733 * The path API was [revised][path-normalize] to normalize `.`,
5734 adjusting the tradeoffs in favor of the most common usage.
5735 * A large number of remaining APIs in `std` were also stabilized
5736 during this cycle; about 75% of the non-deprecated API surface
5738 * The new [string pattern API][string-pattern] landed, which makes
5739 the string slice API much more internally consistent and flexible.
5740 * A new set of [generic conversion traits][conversion] replaced
5741 many existing ad hoc traits.
5742 * Generic numeric traits were [completely removed][num-traits]. This
5743 was made possible thanks to inherent methods for primitive types,
5744 and the removal gives maximal flexibility for designing a numeric
5745 hierarchy in the future.
5746 * The `Fn` traits are now related via [inheritance][fn-inherit]
5747 and provide ergonomic [blanket implementations][fn-blanket].
5748 * The `Index` and `IndexMut` traits were changed to
5749 [take the index by value][index-value], enabling code like
5750 `hash_map["string"]` to work.
5751 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
5752 `Copy` data is known to be `Clone` as well.
5757 * Many errors now have extended explanations that can be accessed with
5758 the `--explain` flag to `rustc`.
5759 * Many new examples have been added to the standard library
5761 * rustdoc has received a number of improvements focused on completion
5763 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
5764 * Much headway was made on ecosystem-wide CI, making it possible
5765 to [compare builds for breakage][ci-compare].
5768 [crates.io]: http://crates.io
5769 [clo]: https://github.com/rust-lang/rust/pull/24034
5770 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
5771 [con]: https://github.com/rust-lang/rust/pull/23875
5772 [cr]: https://github.com/rust-lang/rust/pull/23419
5773 [fe]: https://github.com/rust-lang/rust/pull/23879
5774 [ie]: https://github.com/rust-lang/rust/pull/23300
5775 [inv]: https://github.com/rust-lang/rust/pull/23938
5776 [ios]: https://github.com/rust-lang/rust/pull/24133
5777 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
5778 [lt]: https://github.com/rust-lang/rust/pull/24057
5779 [meth]: https://github.com/rust-lang/rust/pull/24056
5780 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
5781 [po]: https://github.com/rust-lang/rust/pull/24270
5782 [sf]: https://github.com/rust-lang/rust/pull/24517
5783 [slp]: https://github.com/rust-lang/rust/pull/23949
5784 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
5785 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
5786 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
5787 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
5788 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
5789 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
5790 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
5791 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
5792 [self-sized]: https://github.com/rust-lang/rust/pull/22301
5793 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
5794 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
5795 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
5796 [reflect]: https://github.com/rust-lang/rust/pull/23712
5797 [conversion]: https://github.com/rust-lang/rfcs/pull/529
5798 [num-traits]: https://github.com/rust-lang/rust/pull/23549
5799 [index-value]: https://github.com/rust-lang/rust/pull/23601
5800 [dropck]: https://github.com/rust-lang/rfcs/pull/769
5801 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
5802 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
5803 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
5804 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
5805 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
5808 Version 1.0.0-alpha.2 (2015-02-20)
5809 =====================================
5811 * ~1300 changes, numerous bugfixes
5815 * The various I/O modules were [overhauled][io-rfc] to reduce
5816 unnecessary abstractions and provide better interoperation with
5817 the underlying platform. The old `io` module remains temporarily
5819 * The standard library now [participates in feature gating][feat],
5820 so use of unstable libraries now requires a `#![feature(...)]`
5821 attribute. The impact of this change is [described on the
5822 forum][feat-forum]. [RFC][feat-rfc].
5826 * `for` loops [now operate on the `IntoIterator` trait][into],
5827 which eliminates the need to call `.iter()`, etc. to iterate
5828 over collections. There are some new subtleties to remember
5829 though regarding what sort of iterators various types yield, in
5830 particular that `for foo in bar { }` yields values from a move
5831 iterator, destroying the original collection. [RFC][into-rfc].
5832 * Objects now have [default lifetime bounds][obj], so you don't
5833 have to write `Box<Trait+'static>` when you don't care about
5834 storing references. [RFC][obj-rfc].
5835 * In types that implement `Drop`, [lifetimes must outlive the
5836 value][drop]. This will soon make it possible to safely
5837 implement `Drop` for types where `#[unsafe_destructor]` is now
5838 required. Read the [gorgeous RFC][drop-rfc] for details.
5839 * The fully qualified <T as Trait>::X syntax lets you set the Self
5840 type for a trait method or associated type. [RFC][ufcs-rfc].
5841 * References to types that implement `Deref<U>` now [automatically
5842 coerce to references][deref] to the dereferenced type `U`,
5843 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
5844 should eliminate many unsightly uses of `&*`, as when converting
5845 from references to vectors into references to
5846 slices. [RFC][deref-rfc].
5847 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
5848 `|:|`) is obsolete and closure kind is inferred from context.
5849 * [`Self` is a keyword][Self].
5853 * The `Show` and `String` formatting traits [have been
5854 renamed][fmt] to `Debug` and `Display` to more clearly reflect
5855 their related purposes. Automatically getting a string
5856 conversion to use with `format!("{:?}", something_to_debug)` is
5857 now written `#[derive(Debug)]`.
5858 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
5859 OsStr}`, provide strings in platform-specific encodings for easier
5860 interop with system APIs. [RFC][osstr-rfc].
5861 * The `boxed::into_raw` and `Box::from_raw` functions [convert
5862 between `Box<T>` and `*mut T`][boxraw], a common pattern for
5863 creating raw pointers.
5867 * Certain long error messages of the form 'expected foo found bar'
5868 are now [split neatly across multiple
5869 lines][multiline]. Examples in the PR.
5870 * On Unix Rust can be [uninstalled][un] by running
5871 `/usr/local/lib/rustlib/uninstall.sh`.
5872 * The `#[rustc_on_unimplemented]` attribute, requiring the
5873 'on_unimplemented' feature, lets rustc [display custom error
5874 messages when a trait is expected to be implemented for a type
5879 * Rust is tested against a [LALR grammar][lalr], which parses
5880 almost all the Rust files that rustc does.
5882 [boxraw]: https://github.com/rust-lang/rust/pull/21318
5883 [close]: https://github.com/rust-lang/rust/pull/21843
5884 [deref]: https://github.com/rust-lang/rust/pull/21351
5885 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
5886 [drop]: https://github.com/rust-lang/rust/pull/21972
5887 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
5888 [feat]: https://github.com/rust-lang/rust/pull/21248
5889 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
5890 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
5891 [fmt]: https://github.com/rust-lang/rust/pull/21457
5892 [into]: https://github.com/rust-lang/rust/pull/20790
5893 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
5894 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5895 [lalr]: https://github.com/rust-lang/rust/pull/21452
5896 [multiline]: https://github.com/rust-lang/rust/pull/19870
5897 [obj]: https://github.com/rust-lang/rust/pull/22230
5898 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
5899 [onun]: https://github.com/rust-lang/rust/pull/20889
5900 [osstr]: https://github.com/rust-lang/rust/pull/21488
5901 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
5902 [Self]: https://github.com/rust-lang/rust/pull/22158
5903 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
5904 [un]: https://github.com/rust-lang/rust/pull/22256
5907 Version 1.0.0-alpha (2015-01-09)
5908 ==================================
5910 * ~2400 changes, numerous bugfixes
5914 * The language itself is considered feature complete for 1.0,
5915 though there will be many usability improvements and bugfixes
5916 before the final release.
5917 * Nearly 50% of the public API surface of the standard library has
5918 been declared 'stable'. Those interfaces are unlikely to change
5920 * The long-running debate over integer types has been
5921 [settled][ints]: Rust will ship with types named `isize` and
5922 `usize`, rather than `int` and `uint`, for pointer-sized
5923 integers. Guidelines will be rolled out during the alpha cycle.
5924 * Most crates that are not `std` have been moved out of the Rust
5925 distribution into the Cargo ecosystem so they can evolve
5926 separately and don't need to be stabilized as quickly, including
5927 'time', 'getopts', 'num', 'regex', and 'term'.
5928 * Documentation continues to be expanded with more API coverage, more
5929 examples, and more in-depth explanations. The guides have been
5930 consolidated into [The Rust Programming Language][trpl].
5931 * "[Rust By Example][rbe]" is now maintained by the Rust team.
5932 * All official Rust binary installers now come with [Cargo], the
5933 Rust package manager.
5937 * Closures have been [completely redesigned][unboxed] to be
5938 implemented in terms of traits, can now be used as generic type
5939 bounds and thus monomorphized and inlined, or via an opaque
5940 pointer (boxed) as in the old system. The new system is often
5941 referred to as 'unboxed' closures.
5942 * Traits now support [associated types][assoc], allowing families
5943 of related types to be defined together and used generically in
5945 * Enum variants are [namespaced by their type names][enum].
5946 * [`where` clauses][where] provide a more versatile and attractive
5947 syntax for specifying generic bounds, though the previous syntax
5949 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
5951 * Rust [no longer has a runtime][rt] of any description, and only
5952 supports OS threads, not green threads.
5953 * At long last, Rust has been overhauled for 'dynamically-sized
5954 types' ([DST]), which integrates 'fat pointers' (object types,
5955 arrays, and `str`) more deeply into the type system, making it
5957 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
5958 `..j` that produce range types and which, when combined with the
5959 `Index` operator and multidispatch, leads to a convenient slice
5961 * The new range syntax revealed an ambiguity in the fixed-length
5962 array syntax, so now fixed length arrays [are written `[T;
5964 * The `Copy` trait is no longer implemented automatically. Unsafe
5965 pointers no longer implement `Sync` and `Send` so types
5966 containing them don't automatically either. `Sync` and `Send`
5967 are now 'unsafe traits' so one can "forcibly" implement them via
5968 `unsafe impl` if a type confirms to the requirements for them
5969 even though the internals do not (e.g. structs containing unsafe
5970 pointers like `Arc`). These changes are intended to prevent some
5971 footguns and are collectively known as [opt-in built-in
5972 traits][oibit] (though `Sync` and `Send` will soon become pure
5973 library types unknown to the compiler).
5974 * Operator traits now take their operands [by value][ops], and
5975 comparison traits can use multidispatch to compare one type
5976 against multiple other types, allowing e.g. `String` to be
5977 compared with `&str`.
5978 * `if let` and `while let` are no longer feature-gated.
5979 * Rust has adopted a more [uniform syntax for escaping unicode
5980 characters][unicode].
5981 * `macro_rules!` [has been declared stable][mac]. Though it is a
5982 flawed system it is sufficiently popular that it must be usable
5983 for 1.0. Effort has gone into [future-proofing][mac-future] it
5984 in ways that will allow other macro systems to be developed in
5985 parallel, and won't otherwise impact the evolution of the
5987 * The prelude has been [pared back significantly][prelude] such
5988 that it is the minimum necessary to support the most pervasive
5989 code patterns, and through [generalized where clauses][where]
5990 many of the prelude extension traits have been consolidated.
5991 * Rust's rudimentary reflection [has been removed][refl], as it
5992 incurred too much code generation for little benefit.
5993 * [Struct variants][structvars] are no longer feature-gated.
5994 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
5995 known as 'higher-ranked trait bounds', this crucially allows
5996 unboxed closures to work.
5997 * Macros invocations surrounded by parens or square brackets and
5998 not terminated by a semicolon are [parsed as
5999 expressions][macros], which makes expressions like `vec![1i32,
6000 2, 3].len()` work as expected.
6001 * Trait objects now implement their traits automatically, and
6002 traits that can be coerced to objects now must be [object
6004 * Automatically deriving traits is now done with `#[derive(...)]`
6005 not `#[deriving(...)]` for [consistency with other naming
6006 conventions][derive].
6007 * Importing the containing module or enum at the same time as
6008 items or variants they contain is [now done with `self` instead
6009 of `mod`][self], as in use `foo::{self, bar}`
6010 * Glob imports are no longer feature-gated.
6011 * The `box` operator and `box` patterns have been feature-gated
6012 pending a redesign. For now unique boxes should be allocated
6013 like other containers, with `Box::new`.
6017 * A [series][coll1] of [efforts][coll2] to establish
6018 [conventions][coll3] for collections types has resulted in API
6019 improvements throughout the standard library.
6020 * New [APIs for error handling][err] provide ergonomic interop
6021 between error types, and [new conventions][err-conv] describe
6022 more clearly the recommended error handling strategies in Rust.
6023 * The `fail!` macro has been renamed to [`panic!`][panic] so that
6024 it is easier to discuss failure in the context of error handling
6025 without making clarifications as to whether you are referring to
6026 the 'fail' macro or failure more generally.
6027 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
6028 syscall when available.
6029 * The 'serialize' crate has been renamed 'rustc-serialize' and
6030 moved out of the distribution to Cargo. Although it is widely
6031 used now, it is expected to be superseded in the near future.
6032 * The `Show` formatter, typically implemented with
6033 `#[derive(Show)]` is [now requested with the `{:?}`
6034 specifier][show] and is intended for use by all types, for uses
6035 such as `println!` debugging. The new `String` formatter must be
6036 implemented by hand, uses the `{}` specifier, and is intended
6037 for full-fidelity conversions of things that can logically be
6038 represented as strings.
6042 * [Flexible target specification][flex] allows rustc's code
6043 generation to be configured to support otherwise-unsupported
6045 * Rust comes with rust-gdb and rust-lldb scripts that launch their
6046 respective debuggers with Rust-appropriate pretty-printing.
6047 * The Windows installation of Rust is distributed with the
6048 MinGW components currently required to link binaries on that
6053 * Nullable enum optimizations have been extended to more types so
6054 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
6055 space than the inner types themselves.
6056 * Work has begun on supporting AArch64.
6058 [Cargo]: https://crates.io
6059 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
6060 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
6061 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
6062 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
6063 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
6064 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
6065 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
6066 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
6067 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
6068 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
6069 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
6070 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
6071 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
6072 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
6073 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
6074 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
6075 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
6076 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
6077 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
6078 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
6079 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
6080 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
6081 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
6082 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
6083 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
6084 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
6085 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
6086 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
6087 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
6088 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
6089 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
6090 [trpl]: https://doc.rust-lang.org/book/index.html
6091 [rbe]: http://rustbyexample.com/
6094 Version 0.12.0 (2014-10-09)
6095 =============================
6097 * ~1900 changes, numerous bugfixes
6101 * The introductory documentation (now called The Rust Guide) has
6102 been completely rewritten, as have a number of supplementary
6104 * Rust's package manager, Cargo, continues to improve and is
6105 sometimes considered to be quite awesome.
6106 * Many API's in `std` have been reviewed and updated for
6107 consistency with the in-development Rust coding
6108 guidelines. The standard library documentation tracks
6109 stabilization progress.
6110 * Minor libraries have been moved out-of-tree to the rust-lang org
6111 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
6112 be installed with Cargo.
6113 * Lifetime elision allows lifetime annotations to be left off of
6114 function declarations in many common scenarios.
6115 * Rust now works on 64-bit Windows.
6118 * Indexing can be overloaded with the `Index` and `IndexMut`
6120 * The `if let` construct takes a branch only if the `let` pattern
6121 matches, currently behind the 'if_let' feature gate.
6122 * 'where clauses', a more flexible syntax for specifying trait
6123 bounds that is more aesthetic, have been added for traits and
6124 free functions. Where clauses will in the future make it
6125 possible to constrain associated types, which would be
6126 impossible with the existing syntax.
6127 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
6128 the 'slicing_syntax' feature gate, and can be overloaded with
6129 the `Slice` or `SliceMut` traits.
6130 * The syntax for matching of sub-slices has been changed to use a
6131 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
6132 consistency with other uses of `..` and to future-proof
6133 potential additional uses of the syntax.
6134 * The syntax for matching inclusive ranges in patterns has changed
6135 from `0..3` to `0...4` to be consistent with the exclusive range
6137 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
6138 c]`) has been put behind the 'advanced_slice_patterns' feature
6139 gate and may be removed in the future.
6140 * Components of tuples and tuple structs can be extracted using
6141 the `value.0` syntax, currently behind the `tuple_indexing`
6143 * The `#[crate_id]` attribute is no longer supported; versioning
6144 is handled by the package manager.
6145 * Renaming crate imports are now written `extern crate foo as bar`
6146 instead of `extern crate bar = foo`.
6147 * Renaming use statements are now written `use foo as bar` instead
6149 * `let` and `match` bindings and argument names in macros are now
6151 * The new, more efficient, closure types ('unboxed closures') have
6152 been added under a feature gate, 'unboxed_closures'. These will
6153 soon replace the existing closure types, once higher-ranked
6154 trait lifetimes are added to the language.
6155 * `move` has been added as a keyword, for indicating closures
6156 that capture by value.
6157 * Mutation and assignment is no longer allowed in pattern guards.
6158 * Generic structs and enums can now have trait bounds.
6159 * The `Share` trait is now called `Sync` to free up the term
6160 'shared' to refer to 'shared reference' (the default reference
6162 * Dynamically-sized types have been mostly implemented,
6163 unifying the behavior of fat-pointer types with the rest of the
6165 * As part of dynamically-sized types, the `Sized` trait has been
6166 introduced, which qualifying types implement by default, and
6167 which type parameters expect by default. To specify that a type
6168 parameter does not need to be sized, write `<Sized? T>`. Most
6169 types are `Sized`, notable exceptions being unsized arrays
6170 (`[T]`) and trait types.
6171 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
6172 * Lifetime bounds can now be applied to type parameters and object
6174 * The old, reference counted GC type, `Gc<T>` which was once
6175 denoted by the `@` sigil, has finally been removed. GC will be
6176 revisited in the future.
6179 * Library documentation has been improved for a number of modules.
6180 * Bit-vectors, collections::bitv has been modernized.
6181 * The url crate is deprecated in favor of
6182 http://github.com/servo/rust-url, which can be installed with
6184 * Most I/O stream types can be cloned and subsequently closed from
6186 * A `std::time::Duration` type has been added for use in I/O
6187 methods that rely on timers, as well as in the 'time' crate's
6188 `Timespec` arithmetic.
6189 * The runtime I/O abstraction layer that enabled the green thread
6190 scheduler to do non-thread-blocking I/O has been removed, along
6191 with the libuv-based implementation employed by the green thread
6192 scheduler. This will greatly simplify the future I/O work.
6193 * `collections::btree` has been rewritten to have a more
6194 idiomatic and efficient design.
6197 * rustdoc output now indicates the stability levels of API's.
6198 * The `--crate-name` flag can specify the name of the crate
6199 being compiled, like `#[crate_name]`.
6200 * The `-C metadata` specifies additional metadata to hash into
6201 symbol names, and `-C extra-filename` specifies additional
6202 information to put into the output filename, for use by the
6203 package manager for versioning.
6204 * debug info generation has continued to improve and should be
6205 more reliable under both gdb and lldb.
6206 * rustc has experimental support for compiling in parallel
6207 using the `-C codegen-units` flag.
6208 * rustc no longer encodes rpath information into binaries by
6212 * Stack usage has been optimized with LLVM lifetime annotations.
6213 * Official Rust binaries on Linux are more compatible with older
6214 kernels and distributions, built on CentOS 5.10.
6217 Version 0.11.0 (2014-07-02)
6218 ==========================
6220 * ~1700 changes, numerous bugfixes
6223 * ~[T] has been removed from the language. This type is superseded by
6225 * ~str has been removed from the language. This type is superseded by
6227 * ~T has been removed from the language. This type is superseded by the
6229 * @T has been removed from the language. This type is superseded by the
6230 standard library's std::gc::Gc<T> type.
6231 * Struct fields are now all private by default.
6232 * Vector indices and shift amounts are both required to be a `uint`
6233 instead of any integral type.
6234 * Byte character, byte string, and raw byte string literals are now all
6235 supported by prefixing the normal literal with a `b`.
6236 * Multiple ABIs are no longer allowed in an ABI string
6237 * The syntax for lifetimes on closures/procedures has been tweaked
6238 slightly: `<'a>|A, B|: 'b + K -> T`
6239 * Floating point modulus has been removed from the language; however it
6240 is still provided by a library implementation.
6241 * Private enum variants are now disallowed.
6242 * The `priv` keyword has been removed from the language.
6243 * A closure can no longer be invoked through a &-pointer.
6244 * The `use foo, bar, baz;` syntax has been removed from the language.
6245 * The transmute intrinsic no longer works on type parameters.
6246 * Statics now allow blocks/items in their definition.
6247 * Trait bounds are separated from objects with + instead of : now.
6248 * Objects can no longer be read while they are mutably borrowed.
6249 * The address of a static is now marked as insignificant unless the
6250 #[inline(never)] attribute is placed it.
6251 * The #[unsafe_destructor] attribute is now behind a feature gate.
6252 * Struct literals are no longer allowed in ambiguous positions such as
6253 if, while, match, and for..in.
6254 * Declaration of lang items and intrinsics are now feature-gated by
6256 * Integral literals no longer default to `int`, and floating point
6257 literals no longer default to `f64`. Literals must be suffixed with an
6258 appropriate type if inference cannot determine the type of the
6260 * The Box<T> type is no longer implicitly borrowed to &mut T.
6261 * Procedures are now required to not capture borrowed references.
6264 * The standard library is now a "facade" over a number of underlying
6265 libraries. This means that development on the standard library should
6266 be speedier due to smaller crates, as well as a clearer line between
6268 * A new library, libcore, lives under the standard library's facade
6269 which is Rust's "0-assumption" library, suitable for embedded and
6270 kernel development for example.
6271 * A regex crate has been added to the standard distribution. This crate
6272 includes statically compiled regular expressions.
6273 * The unwrap/unwrap_err methods on Result require a Show bound for
6274 better error messages.
6275 * The return types of the std::comm primitives have been centralized
6276 around the Result type.
6277 * A number of I/O primitives have gained the ability to time out their
6279 * A number of I/O primitives have gained the ability to close their
6280 reading/writing halves to cancel pending operations.
6281 * Reverse iterator methods have been removed in favor of `rev()` on
6282 their forward-iteration counterparts.
6283 * A bitflags! macro has been added to enable easy interop with C and
6284 management of bit flags.
6285 * A debug_assert! macro is now provided which is disabled when
6286 `--cfg ndebug` is passed to the compiler.
6287 * A graphviz crate has been added for creating .dot files.
6288 * The std::cast module has been migrated into std::mem.
6289 * The std::local_data api has been migrated from freestanding functions
6290 to being based on methods.
6291 * The Pod trait has been renamed to Copy.
6292 * jemalloc has been added as the default allocator for types.
6293 * The API for allocating memory has been changed to use proper alignment
6294 and sized deallocation
6295 * Connecting a TcpStream or binding a TcpListener is now based on a
6296 string address and a u16 port. This allows connecting to a hostname as
6298 * The Reader trait now contains a core method, read_at_least(), which
6299 correctly handles many repeated 0-length reads.
6300 * The process-spawning API is now centered around a builder-style
6302 * The :? printing qualifier has been moved from the standard library to
6303 an external libdebug crate.
6304 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
6305 have been renamed to Eq/Ord.
6306 * The select/plural methods have been removed from format!. The escapes
6307 for { and } have also changed from \{ and \} to {{ and }},
6309 * The TaskBuilder API has been re-worked to be a true builder, and
6310 extension traits for spawning native/green tasks have been added.
6313 * All breaking changes to the language or libraries now have their
6314 commit message annotated with `[breaking-change]` to allow for easy
6315 discovery of breaking changes.
6316 * The compiler will now try to suggest how to annotate lifetimes if a
6317 lifetime-related error occurs.
6318 * Debug info continues to be improved greatly with general bug fixes and
6319 better support for situations like link time optimization (LTO).
6320 * Usage of syntax extensions when cross-compiling has been fixed.
6321 * Functionality equivalent to GCC & Clang's -ffunction-sections,
6322 -fdata-sections and --gc-sections has been enabled by default
6323 * The compiler is now stricter about where it will load module files
6324 from when a module is declared via `mod foo;`.
6325 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
6326 Syntax extensions are now discovered via a "plugin registrar" type
6327 which will be extended in the future to other various plugins.
6328 * Lints have been restructured to allow for dynamically loadable lints.
6329 * A number of rustdoc improvements:
6330 * The HTML output has been visually redesigned.
6331 * Markdown is now powered by hoedown instead of sundown.
6332 * Searching heuristics have been greatly improved.
6333 * The search index has been reduced in size by a great amount.
6334 * Cross-crate documentation via `pub use` has been greatly improved.
6335 * Primitive types are now hyperlinked and documented.
6336 * Documentation has been moved from static.rust-lang.org/doc to
6338 * A new sandbox, play.rust-lang.org, is available for running and
6339 sharing rust code examples on-line.
6340 * Unused attributes are now more robustly warned about.
6341 * The dead_code lint now warns about unused struct fields.
6342 * Cross-compiling to iOS is now supported.
6343 * Cross-compiling to mipsel is now supported.
6344 * Stability attributes are now inherited by default and no longer apply
6345 to intra-crate usage, only inter-crate usage.
6346 * Error message related to non-exhaustive match expressions have been
6350 Version 0.10 (2014-04-03)
6351 =========================
6353 * ~1500 changes, numerous bugfixes
6356 * A new RFC process is now in place for modifying the language.
6357 * Patterns with `@`-pointers have been removed from the language.
6358 * Patterns with unique vectors (`~[T]`) have been removed from the
6360 * Patterns with unique strings (`~str`) have been removed from the
6362 * `@str` has been removed from the language.
6363 * `@[T]` has been removed from the language.
6364 * `@self` has been removed from the language.
6365 * `@Trait` has been removed from the language.
6366 * Headers on `~` allocations which contain `@` boxes inside the type for
6367 reference counting have been removed.
6368 * The semantics around the lifetimes of temporary expressions have changed,
6369 see #3511 and #11585 for more information.
6370 * Cross-crate syntax extensions are now possible, but feature gated. See
6371 #11151 for more information. This includes both `macro_rules!` macros as
6372 well as syntax extensions such as `format!`.
6373 * New lint modes have been added, and older ones have been turned on to be
6375 * Unnecessary parentheses
6378 * Uppercase variables
6379 * Publicly visible private types
6380 * `#[deriving]` with raw pointers
6381 * Unsafe functions can no longer be coerced to closures.
6382 * Various obscure macros such as `log_syntax!` are now behind feature gates.
6383 * The `#[simd]` attribute is now behind a feature gate.
6384 * Visibility is no longer allowed on `extern crate` statements, and
6385 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
6386 * Trailing commas are now allowed in argument lists and tuple patterns.
6387 * The `do` keyword has been removed, it is now a reserved keyword.
6388 * Default type parameters have been implemented, but are feature gated.
6389 * Borrowed variables through captures in closures are now considered soundly.
6390 * `extern mod` is now `extern crate`
6391 * The `Freeze` trait has been removed.
6392 * The `Share` trait has been added for types that can be shared among
6394 * Labels in macros are now hygienic.
6395 * Expression/statement macro invocations can be delimited with `{}` now.
6396 * Treatment of types allowed in `static mut` locations has been tweaked.
6397 * The `*` and `.` operators are now overloadable through the `Deref` and
6399 * `~Trait` and `proc` no longer have `Send` bounds by default.
6400 * Partial type hints are now supported with the `_` type marker.
6401 * An `Unsafe` type was introduced for interior mutability. It is now
6402 considered undefined to transmute from `&T` to `&mut T` without using the
6404 * The #[linkage] attribute was implemented for extern statics/functions.
6405 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
6406 * `Pod` was renamed to `Copy`.
6409 * The `libextra` library has been removed. It has now been decomposed into
6410 component libraries with smaller and more focused nuggets of
6411 functionality. The full list of libraries can be found on the
6412 documentation index page.
6413 * std: `std::condition` has been removed. All I/O errors are now propagated
6414 through the `Result` type. In order to assist with error handling, a
6415 `try!` macro for unwrapping errors with an early return and a lint for
6416 unused results has been added. See #12039 for more information.
6417 * std: The `vec` module has been renamed to `slice`.
6418 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
6419 This will become the only growable vector in the future.
6420 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
6421 are now found at `std::io::BufferedReader` instead of
6422 `std::io::buffered::BufferedReader`.
6423 * std: `print` and `println` are no longer in the prelude, the `print!` and
6424 `println!` macros are intended to be used instead.
6425 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
6426 attempts to statically prevent cycles.
6427 * std: The standard distribution is adopting the policy of pushing failure
6428 to the user rather than failing in libraries. Many functions (such as
6429 `slice::last()`) now return `Option<T>` instead of `T` + failing.
6430 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
6431 deriving mode: `#[deriving(Show)]`.
6432 * std: `ToStr` is now implemented for all types implementing `Show`.
6433 * std: The formatting trait methods now take `&self` instead of `&T`
6434 * std: The `invert()` method on iterators has been renamed to `rev()`
6435 * std: `std::num` has seen a reduction in the genericity of its traits,
6436 consolidating functionality into a few core traits.
6437 * std: Backtraces are now printed on task failure if the environment
6438 variable `RUST_BACKTRACE` is present.
6439 * std: Naming conventions for iterators have been standardized. More details
6440 can be found on the wiki's style guide.
6441 * std: `eof()` has been removed from the `Reader` trait. Specific types may
6442 still implement the function.
6443 * std: Networking types are now cloneable to allow simultaneous reads/writes.
6444 * std: `assert_approx_eq!` has been removed
6445 * std: The `e` and `E` formatting specifiers for floats have been added to
6446 print them in exponential notation.
6447 * std: The `Times` trait has been removed
6448 * std: Indications of variance and opting out of builtin bounds is done
6449 through marker types in `std::kinds::marker` now
6450 * std: `hash` has been rewritten, `IterBytes` has been removed, and
6451 `#[deriving(Hash)]` is now possible.
6452 * std: `SharedChan` has been removed, `Sender` is now cloneable.
6453 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
6454 * std: `Chan::new` is now `channel()`.
6455 * std: A new synchronous channel type has been implemented.
6456 * std: A `select!` macro is now provided for selecting over `Receiver`s.
6457 * std: `hashmap` and `trie` have been moved to `libcollections`
6458 * std: `run` has been rolled into `io::process`
6459 * std: `assert_eq!` now uses `{}` instead of `{:?}`
6460 * std: The equality and comparison traits have seen some reorganization.
6461 * std: `rand` has moved to `librand`.
6462 * std: `to_{lower,upper}case` has been implemented for `char`.
6463 * std: Logging has been moved to `liblog`.
6464 * collections: `HashMap` has been rewritten for higher performance and less
6466 * native: The default runtime is now `libnative`. If `libgreen` is desired,
6467 it can be booted manually. The runtime guide has more information and
6469 * native: All I/O functionality except signals has been implemented.
6470 * green: Task spawning with `libgreen` has been optimized with stack caching
6471 and various trimming of code.
6472 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
6473 * sync: The `extra::sync` module has been updated to modern rust (and moved
6474 to the `sync` library), tweaking and improving various interfaces while
6475 dropping redundant functionality.
6476 * sync: A new `Barrier` type has been added to the `sync` library.
6477 * sync: An efficient mutex for native and green tasks has been implemented.
6478 * serialize: The `base64` module has seen some improvement. It treats
6479 newlines better, has non-string error values, and has seen general
6481 * fourcc: A `fourcc!` macro was introduced
6482 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
6483 hexadecimal literal.
6486 * `rustpkg` has been deprecated and removed from the main repository. Its
6487 replacement, `cargo`, is under development.
6488 * Nightly builds of rust are now available
6489 * The memory usage of rustc has been improved many times throughout this
6491 * The build process supports disabling rpath support for the rustc binary
6493 * Code generation has improved in some cases, giving more information to the
6494 LLVM optimization passes to enable more extensive optimizations.
6495 * Debuginfo compatibility with lldb on OSX has been restored.
6496 * The master branch is now gated on an android bot, making building for
6497 android much more reliable.
6498 * Output flags have been centralized into one `--emit` flag.
6499 * Crate type flags have been centralized into one `--crate-type` flag.
6500 * Codegen flags have been consolidated behind a `-C` flag.
6501 * Linking against outdated crates now has improved error messages.
6502 * Error messages with lifetimes will often suggest how to annotate the
6503 function to fix the error.
6504 * Many more types are documented in the standard library, and new guides
6506 * Many `rustdoc` improvements:
6507 * code blocks are syntax highlighted.
6508 * render standalone markdown files.
6509 * the --test flag tests all code blocks by default.
6510 * exported macros are displayed.
6511 * re-exported types have their documentation inlined at the location of the
6513 * search works across crates that have been rendered to the same output
6517 Version 0.9 (2014-01-09)
6518 ==========================
6520 * ~1800 changes, numerous bugfixes
6523 * The `float` type has been removed. Use `f32` or `f64` instead.
6524 * A new facility for enabling experimental features (feature gating) has
6525 been added, using the crate-level `#[feature(foo)]` attribute.
6526 * Managed boxes (@) are now behind a feature gate
6527 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
6528 standard library's `Gc` or `Rc` types instead.
6529 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
6530 * Jumping back to the top of a loop is now done with `continue` instead of
6532 * Strings can no longer be mutated through index assignment.
6533 * Raw strings can be created via the basic `r"foo"` syntax or with matched
6534 hash delimiters, as in `r###"foo"###`.
6535 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
6537 * The `&fn` type is now written `|args| -> ret` to match the literal form.
6538 * `@fn`s have been removed.
6539 * `do` only works with procs in order to make it obvious what the cost
6541 * Single-element tuple-like structs can no longer be dereferenced to
6542 obtain the inner value. A more comprehensive solution for overloading
6543 the dereference operator will be provided in the future.
6544 * The `#[link(...)]` attribute has been replaced with
6545 `#[crate_id = "name#vers"]`.
6546 * Empty `impl`s must be terminated with empty braces and may not be
6547 terminated with a semicolon.
6548 * Keywords are no longer allowed as lifetime names; the `self` lifetime
6549 no longer has any special meaning.
6550 * The old `fmt!` string formatting macro has been removed.
6551 * `printf!` and `printfln!` (old-style formatting) removed in favor of
6552 `print!` and `println!`.
6553 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
6554 * The `extern mod foo (name = "bar")` syntax has been removed. Use
6555 `extern mod foo = "bar"` instead.
6556 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
6557 * Macros can have attributes.
6558 * Macros can expand to items with attributes.
6559 * Macros can expand to multiple items.
6560 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
6561 * Comments may be nested.
6562 * Values automatically coerce to trait objects they implement, without
6564 * Enum discriminants are no longer an entire word but as small as needed to
6565 contain all the variants. The `repr` attribute can be used to override
6566 the discriminant size, as in `#[repr(int)]` for integer-sized, and
6567 `#[repr(C)]` to match C enums.
6568 * Non-string literals are not allowed in attributes (they never worked).
6569 * The FFI now supports variadic functions.
6570 * Octal numeric literals, as in `0o7777`.
6571 * The `concat!` syntax extension performs compile-time string concatenation.
6572 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
6573 removed as Rust no longer uses segmented stacks.
6574 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
6575 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
6576 not `*`; ignoring remaining fields of a struct is also done with `..`,
6577 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
6578 * `rustc` supports the "win64" calling convention via `extern "win64"`.
6579 * `rustc` supports the "system" calling convention, which defaults to the
6580 preferred convention for the target platform, "stdcall" on 32-bit Windows,
6582 * The `type_overflow` lint (default: warn) checks literals for overflow.
6583 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
6584 * The `attribute_usage` lint (default: warn) warns about unknown
6586 * The `unknown_features` lint (default: warn) warns about unknown
6588 * The `dead_code` lint (default: warn) checks for dead code.
6589 * Rust libraries can be linked statically to one another
6590 * `#[link_args]` is behind the `link_args` feature gate.
6591 * Native libraries are now linked with `#[link(name = "foo")]`
6592 * Native libraries can be statically linked to a rust crate
6593 (`#[link(name = "foo", kind = "static")]`).
6594 * Native OS X frameworks are now officially supported
6595 (`#[link(name = "foo", kind = "framework")]`).
6596 * The `#[thread_local]` attribute creates thread-local (not task-local)
6597 variables. Currently behind the `thread_local` feature gate.
6598 * The `return` keyword may be used in closures.
6599 * Types that can be copied via a memcpy implement the `Pod` kind.
6600 * The `cfg` attribute can now be used on struct fields and enum variants.
6603 * std: The `option` and `result` API's have been overhauled to make them
6604 simpler, more consistent, and more composable.
6605 * std: The entire `std::io` module has been replaced with one that is
6606 more comprehensive and that properly interfaces with the underlying
6607 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
6609 * std: `io::util` contains a number of useful implementations of
6610 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
6611 `ZeroReader`, `TeeReader`.
6612 * std: The reference counted pointer type `extra::rc` moved into std.
6613 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
6614 just a wrapper around it).
6615 * std: The `Either` type has been removed.
6616 * std: `fmt::Default` can be implemented for any type to provide default
6617 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
6618 * std: The `rand` API continues to be tweaked.
6619 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
6620 on failure in gdb, is now named `rust_fail`.
6621 * std: The `each_key` and `each_value` methods on `HashMap` have been
6622 replaced by the `keys` and `values` iterators.
6623 * std: Functions dealing with type size and alignment have moved from the
6624 `sys` module to the `mem` module.
6625 * std: The `path` module was written and API changed.
6626 * std: `str::from_utf8` has been changed to cast instead of allocate.
6627 * std: `starts_with` and `ends_with` methods added to vectors via the
6628 `ImmutableEqVector` trait, which is in the prelude.
6629 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
6630 if the index is out of bounds.
6631 * std: Task failure no longer propagates between tasks, as the model was
6632 complex, expensive, and incompatible with thread-based tasks.
6633 * std: The `Any` type can be used for dynamic typing.
6634 * std: `~Any` can be passed to the `fail!` macro and retrieved via
6636 * std: Methods that produce iterators generally do not have an `_iter`
6638 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
6639 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
6640 * std: `util::ignore` renamed to `prelude::drop`.
6641 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
6643 * std: `vec::raw` has seen a lot of cleanup and API changes.
6644 * std: The standard library no longer includes any C++ code, and very
6645 minimal C, eliminating the dependency on libstdc++.
6646 * std: Runtime scheduling and I/O functionality has been factored out into
6647 extensible interfaces and is now implemented by two different crates:
6648 libnative, for native threading and I/O; and libgreen, for green threading
6649 and I/O. This paves the way for using the standard library in more limited
6650 embedded environments.
6651 * std: The `comm` module has been rewritten to be much faster, have a
6652 simpler, more consistent API, and to work for both native and green
6654 * std: All libuv dependencies have been moved into the rustuv crate.
6655 * native: New implementations of runtime scheduling on top of OS threads.
6656 * native: New native implementations of TCP, UDP, file I/O, process spawning,
6658 * green: The green thread scheduler and message passing types are almost
6660 * extra: The `flatpipes` module had bitrotted and was removed.
6661 * extra: All crypto functions have been removed and Rust now has a policy of
6662 not reimplementing crypto in the standard library. In the future crypto
6663 will be provided by external crates with bindings to established libraries.
6664 * extra: `c_vec` has been modernized.
6665 * extra: The `sort` module has been removed. Use the `sort` method on
6669 * The `rust` and `rusti` commands have been removed, due to lack of
6671 * `rustdoc` was completely rewritten.
6672 * `rustdoc` can test code examples in documentation.
6673 * `rustpkg` can test packages with the argument, 'test'.
6674 * `rustpkg` supports arbitrary dependencies, including C libraries.
6675 * `rustc`'s support for generating debug info is improved again.
6676 * `rustc` has better error reporting for unbalanced delimiters.
6677 * `rustc`'s JIT support was removed due to bitrot.
6678 * Executables and static libraries can be built with LTO (-Z lto)
6679 * `rustc` adds a `--dep-info` flag for communicating dependencies to
6683 Version 0.8 (2013-09-26)
6684 ============================
6686 * ~2200 changes, numerous bugfixes
6689 * The `for` loop syntax has changed to work with the `Iterator` trait.
6690 * At long last, unwinding works on Windows.
6691 * Default methods are ready for use.
6692 * Many trait inheritance bugs fixed.
6693 * Owned and borrowed trait objects work more reliably.
6694 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
6695 * rustc can omit emission of code for the `debug!` macro if it is passed
6697 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
6698 for foo.rs, then foo/mod.rs, and will generate an error when both are
6700 * Strings no longer contain trailing nulls. The new `std::c_str` module
6701 provides new mechanisms for converting to C strings.
6702 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
6703 * The FFI has been overhauled such that foreign functions are called directly,
6704 instead of through a stack-switching wrapper.
6705 * Calling a foreign function must be done through a Rust function with the
6706 `#[fixed_stack_segment]` attribute.
6707 * The `externfn!` macro can be used to declare both a foreign function and
6708 a `#[fixed_stack_segment]` wrapper at once.
6709 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
6710 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
6711 * `priv` is disallowed everywhere except for struct fields and enum variants.
6712 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
6713 * `ref` bindings in irrefutable patterns work correctly now.
6714 * `char` is now prevented from containing invalid code points.
6715 * Casting to `bool` is no longer allowed.
6716 * `\0` is now accepted as an escape in chars and strings.
6717 * `yield` is a reserved keyword.
6718 * `typeof` is a reserved keyword.
6719 * Crates may be imported by URL with `extern mod foo = "url";`.
6720 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
6721 * Static vectors can be initialized with repeating elements,
6722 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
6723 * Static structs can be initialized with functional record update,
6724 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
6725 * `cfg!` can be used to conditionally execute code based on the crate
6726 configuration, similarly to `#[cfg(...)]`.
6727 * The `unnecessary_qualification` lint detects unneeded module
6728 prefixes (default: allow).
6729 * Arithmetic operations have been implemented on the SIMD types in
6730 `std::unstable::simd`.
6731 * Exchange allocation headers were removed, reducing memory usage.
6732 * `format!` implements a completely new, extensible, and higher-performance
6733 string formatting system. It will replace `fmt!`.
6734 * `print!` and `println!` write formatted strings (using the `format!`
6735 extension) to stdout.
6736 * `write!` and `writeln!` write formatted strings (using the `format!`
6737 extension) to the new Writers in `std::rt::io`.
6738 * The library section in which a function or static is placed may
6739 be specified with `#[link_section = "..."]`.
6740 * The `proto!` syntax extension for defining bounded message protocols
6742 * `macro_rules!` is hygienic for `let` declarations.
6743 * The `#[export_name]` attribute specifies the name of a symbol.
6744 * `unreachable!` can be used to indicate unreachable code, and fails
6748 * std: Transitioned to the new runtime, written in Rust.
6749 * std: Added an experimental I/O library, `rt::io`, based on the new
6751 * std: A new generic `range` function was added to the prelude, replacing
6752 `uint::range` and friends.
6753 * std: `range_rev` no longer exists. Since range is an iterator it can be
6754 reversed with `range(lo, hi).invert()`.
6755 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
6756 renamed to `unwrap_or`.
6757 * std: The `iterator` module was renamed to `iter`.
6758 * std: Integral types now support the `checked_add`, `checked_sub`, and
6759 `checked_mul` operations for detecting overflow.
6760 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
6762 * std: Methods are standardizing on conventions for casting methods:
6763 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
6765 * std: The `CString` type in `c_str` provides new ways to convert to and
6767 * std: `DoubleEndedIterator` can yield elements in two directions.
6768 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
6770 * std: `str::from_bytes` renamed to `str::from_utf8`.
6771 * std: `pop_opt` and `shift_opt` methods added to vectors.
6772 * std: The task-local data interface no longer uses @, and keys are
6773 no longer function pointers.
6774 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
6775 * std: Added `SharedPort` to `comm`.
6776 * std: `Eq` has a default method for `ne`; only `eq` is required
6778 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
6779 is required in implementations.
6780 * std: `is_utf8` performance is improved, impacting many string functions.
6781 * std: `os::MemoryMap` provides cross-platform mmap.
6782 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
6783 are not 'in-bounds' are considered undefined.
6784 * std: Many freestanding functions in `vec` removed in favor of methods.
6785 * std: Many freestanding functions on scalar types removed in favor of
6787 * std: Many options to task builders were removed since they don't make
6788 sense in the new scheduler design.
6789 * std: More containers implement `FromIterator` so can be created by the
6791 * std: More complete atomic types in `unstable::atomics`.
6792 * std: `comm::PortSet` removed.
6793 * std: Mutating methods in the `Set` and `Map` traits have been moved into
6794 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
6795 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
6796 default implementations.
6797 * std: Various `from_str` functions were removed in favor of a generic
6798 `from_str` which is available in the prelude.
6799 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
6800 * extra: `dlist`, the doubly-linked list was modernized.
6801 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
6802 * extra: Added `glob` module, replacing `std::os::glob`.
6803 * extra: `rope` was removed.
6804 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
6805 * extra: `net`, and `timer` were removed. The experimental replacements
6806 are `std::rt::io::net` and `std::rt::io::timer`.
6807 * extra: Iterators implemented for `SmallIntMap`.
6808 * extra: Iterators implemented for `Bitv` and `BitvSet`.
6809 * extra: `SmallIntSet` removed. Use `BitvSet`.
6810 * extra: Performance of JSON parsing greatly improved.
6811 * extra: `semver` updated to SemVer 2.0.0.
6812 * extra: `term` handles more terminals correctly.
6813 * extra: `dbg` module removed.
6814 * extra: `par` module removed.
6815 * extra: `future` was cleaned up, with some method renames.
6816 * extra: Most free functions in `getopts` were converted to methods.
6819 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
6820 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
6821 similarly to gcc's `--march` flag.
6822 * rustc's performance compiling small crates is much better.
6823 * rustpkg has received many improvements.
6824 * rustpkg supports git tags as package IDs.
6825 * rustpkg builds into target-specific directories so it can be used for
6827 * The number of concurrent test tasks is controlled by the environment
6828 variable RUST_TEST_TASKS.
6829 * The test harness can now report metrics for benchmarks.
6830 * All tools have man pages.
6831 * Programs compiled with `--test` now support the `-h` and `--help` flags.
6832 * The runtime uses jemalloc for allocations.
6833 * Segmented stacks are temporarily disabled as part of the transition to
6834 the new runtime. Stack overflows are possible!
6835 * A new documentation backend, rustdoc_ng, is available for use. It is
6836 still invoked through the normal `rustdoc` command.
6839 Version 0.7 (2013-07-03)
6840 =======================
6842 * ~2000 changes, numerous bugfixes
6845 * `impl`s no longer accept a visibility qualifier. Put them on methods
6847 * The borrow checker has been rewritten with flow-sensitivity, fixing
6848 many bugs and inconveniences.
6849 * The `self` parameter no longer implicitly means `&'self self`,
6850 and can be explicitly marked with a lifetime.
6851 * Overloadable compound operators (`+=`, etc.) have been temporarily
6852 removed due to bugs.
6853 * The `for` loop protocol now requires `for`-iterators to return `bool`
6854 so they compose better.
6855 * The `Durable` trait is replaced with the `'static` bounds.
6856 * Trait default methods work more often.
6857 * Structs with the `#[packed]` attribute have byte alignment and
6858 no padding between fields.
6859 * Type parameters bound by `Copy` must now be copied explicitly with
6861 * It is now illegal to move out of a dereferenced unsafe pointer.
6862 * `Option<~T>` is now represented as a nullable pointer.
6863 * `@mut` does dynamic borrow checks correctly.
6864 * The `main` function is only detected at the topmost level of the crate.
6865 The `#[main]` attribute is still valid anywhere.
6866 * Struct fields may no longer be mutable. Use inherited mutability.
6867 * The `#[no_send]` attribute makes a type that would otherwise be
6869 * The `#[no_freeze]` attribute makes a type that would otherwise be
6871 * Unbounded recursion will abort the process after reaching the limit
6872 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
6873 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
6874 are never implicitly copyable.
6875 * `#[static_assert]` makes compile-time assertions about static bools.
6876 * At long last, 'argument modes' no longer exist.
6877 * The rarely used `use mod` statement no longer exists.
6880 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
6882 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
6883 `Rand`, `Zero` and `ToStr` can all be automatically derived with
6885 * The `bytes!` macro returns a vector of bytes for string, u8, char,
6886 and unsuffixed integer literals.
6889 * The `core` crate was renamed to `std`.
6890 * The `std` crate was renamed to `extra`.
6891 * More and improved documentation.
6892 * std: `iterator` module for external iterator objects.
6893 * Many old-style (internal, higher-order function) iterators replaced by
6894 implementations of `Iterator`.
6895 * std: Many old internal vector and string iterators,
6896 incl. `any`, `all`. removed.
6897 * std: The `finalize` method of `Drop` renamed to `drop`.
6898 * std: The `drop` method now takes `&mut self` instead of `&self`.
6899 * std: The prelude no longer re-exports any modules, only types and traits.
6900 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
6901 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
6902 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
6903 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
6904 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
6905 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
6906 * std: Many types implement `Clone`.
6907 * std: `path` type renamed to `Path`.
6908 * std: `mut` module and `Mut` type removed.
6909 * std: Many standalone functions removed in favor of methods and iterators
6910 in `vec`, `str`. In the future methods will also work as functions.
6911 * std: `reinterpret_cast` removed. Use `transmute`.
6912 * std: ascii string handling in `std::ascii`.
6913 * std: `Rand` is implemented for ~/@.
6914 * std: `run` module for spawning processes overhauled.
6915 * std: Various atomic types added to `unstable::atomic`.
6916 * std: Various types implement `Zero`.
6917 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
6918 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
6919 * std: Added `os::mkdir_recursive`.
6920 * std: Added `os::glob` function performs filesystems globs.
6921 * std: `FuzzyEq` renamed to `ApproxEq`.
6922 * std: `Map` now defines `pop` and `swap` methods.
6923 * std: `Cell` constructors converted to static methods.
6924 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
6925 * extra: `flate` module moved from `std` to `extra`.
6926 * extra: `fileinput` module for iterating over a series of files.
6927 * extra: `Complex` number type and `complex` module.
6928 * extra: `Rational` number type and `rational` module.
6929 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
6930 * extra: `term` uses terminfo now, is more correct.
6931 * extra: `arc` functions converted to methods.
6932 * extra: Implementation of fixed output size variations of SHA-2.
6935 * `unused_variable` lint mode for unused variables (default: warn).
6936 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
6938 * `unused_mut` lint mode for identifying unused `mut` qualifiers
6940 * `dead_assignment` lint mode for unread variables (default: warn).
6941 * `unnecessary_allocation` lint mode detects some heap allocations that are
6942 immediately borrowed so could be written without allocating (default: warn).
6943 * `missing_doc` lint mode (default: allow).
6944 * `unreachable_code` lint mode (default: warn).
6945 * The `rusti` command has been rewritten and a number of bugs addressed.
6946 * rustc outputs in color on more terminals.
6947 * rustc accepts a `--link-args` flag to pass arguments to the linker.
6948 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
6949 * Compiling with `-g` will make the binary record information about
6950 dynamic borrowcheck failures for debugging.
6951 * rustdoc has a nicer stylesheet.
6952 * Various improvements to rustdoc.
6953 * Improvements to rustpkg (see the detailed release notes).
6956 Version 0.6 (2013-04-03)
6957 ========================
6959 * ~2100 changes, numerous bugfixes
6962 * The self type parameter in traits is now spelled `Self`
6963 * The `self` parameter in trait and impl methods must now be explicitly
6964 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
6965 * Static methods no longer require the `static` keyword and instead
6966 are distinguished by the lack of a `self` parameter
6967 * Replaced the `Durable` trait with the `'static` lifetime
6968 * The old closure type syntax with the trailing sigil has been
6969 removed in favor of the more consistent leading sigil
6970 * `super` is a keyword, and may be prefixed to paths
6971 * Trait bounds are separated with `+` instead of whitespace
6972 * Traits are implemented with `impl Trait for Type`
6973 instead of `impl Type: Trait`
6974 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
6975 * The `export` keyword has finally been removed
6976 * The `move` keyword has been removed (see "Semantic changes")
6977 * The interior mutability qualifier on vectors, `[mut T]`, has been
6978 removed. Use `&mut [T]`, etc.
6979 * `mut` is no longer valid in `~mut T`. Use inherited mutability
6980 * `fail` is no longer a keyword. Use `fail!()`
6981 * `assert` is no longer a keyword. Use `assert!()`
6982 * `log` is no longer a keyword. use `debug!`, etc.
6983 * 1-tuples may be represented as `(T,)`
6984 * Struct fields may no longer be `mut`. Use inherited mutability,
6985 `@mut T`, `core::mut` or `core::cell`
6986 * `extern mod { ... }` is no longer valid syntax for foreign
6987 function modules. Use extern blocks: `extern { ... }`
6988 * Newtype enums removed. Use tuple-structs.
6989 * Trait implementations no longer support visibility modifiers
6990 * Pattern matching over vectors improved and expanded
6991 * `const` renamed to `static` to correspond to lifetime name,
6992 and make room for future `static mut` unsafe mutable globals.
6993 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
6994 * `Clone` implementations can be automatically generated with
6995 `#[deriving(Clone)]`
6996 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
6997 instead of `foo as Bar`.
6998 * Fixed length vector types are now written as `[int, .. 3]`
6999 instead of `[int * 3]`.
7000 * Fixed length vector types can express the length as a constant
7001 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
7004 * Types with owned pointers or custom destructors move by default,
7005 eliminating the `move` keyword
7006 * All foreign functions are considered unsafe
7007 * &mut is now unaliasable
7008 * Writes to borrowed @mut pointers are prevented dynamically
7010 * The name of the main function can be customized using #[main]
7011 * The default type of an inferred closure is &fn instead of @fn
7012 * `use` statements may no longer be "chained" - they cannot import
7013 identifiers imported by previous `use` statements
7014 * `use` statements are crate relative, importing from the "top"
7015 of the crate by default. Paths may be prefixed with `super::`
7016 or `self::` to change the search behavior.
7017 * Method visibility is inherited from the implementation declaration
7018 * Structural records have been removed
7019 * Many more types can be used in static items, including enums
7020 'static-lifetime pointers and vectors
7021 * Pattern matching over vectors improved and expanded
7022 * Typechecking of closure types has been overhauled to
7023 improve inference and eliminate unsoundness
7024 * Macros leave scope at the end of modules, unless that module is
7025 tagged with #[macro_escape]
7028 * Added big integers to `std::bigint`
7029 * Removed `core::oldcomm` module
7030 * Added pipe-based `core::comm` module
7031 * Numeric traits have been reorganized under `core::num`
7032 * `vec::slice` finally returns a slice
7033 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
7034 * Containers reorganized around traits in `core::container`
7035 * `core::dvec` removed, `~[T]` is a drop-in replacement
7036 * `core::send_map` renamed to `core::hashmap`
7037 * `std::map` removed; replaced with `core::hashmap`
7038 * `std::treemap` reimplemented as an owned balanced tree
7039 * `std::deque` and `std::smallintmap` reimplemented as owned containers
7040 * `core::trie` added as a fast ordered map for integer keys
7041 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
7042 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
7043 overload the comparison operators, whereas `TotalOrd` is used
7044 by certain container types
7047 * Replaced the 'cargo' package manager with 'rustpkg'
7048 * Added all-purpose 'rust' tool
7049 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
7050 * rustc now *attempts* to offer spelling suggestions
7051 * Improved support for ARM and Android
7052 * Preliminary MIPS backend
7053 * Improved foreign function ABI implementation for x86, x86_64
7054 * Various memory usage improvements
7055 * Rust code may be embedded in foreign code under limited circumstances
7056 * Inline assembler supported by new asm!() syntax extension.
7059 Version 0.5 (2012-12-21)
7060 ===========================
7062 * ~900 changes, numerous bugfixes
7065 * Removed `<-` move operator
7066 * Completed the transition from the `#fmt` extension syntax to `fmt!`
7067 * Removed old fixed length vector syntax - `[T]/N`
7068 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
7069 * Macros may now expand to items and statements
7070 * `a.b()` is always parsed as a method call, never as a field projection
7071 * `Eq` and `IterBytes` implementations can be automatically generated
7072 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
7073 * Removed the special crate language for `.rc` files
7074 * Function arguments may consist of any irrefutable pattern
7077 * `&` and `~` pointers may point to objects
7078 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
7079 * Enum variants may be structs
7080 * Destructors can be added to all nominal types with the Drop trait
7081 * Structs and nullary enum variants may be constants
7082 * Values that cannot be implicitly copied are now automatically moved
7083 without writing `move` explicitly
7084 * `&T` may now be coerced to `*T`
7085 * Coercions happen in `let` statements as well as function calls
7086 * `use` statements now take crate-relative paths
7087 * The module and type namespaces have been merged so that static
7088 method names can be resolved under the trait in which they are
7091 * Improved support for language features
7092 * Trait inheritance works in many scenarios
7093 * More support for explicit self arguments in methods - `self`, `&self`
7094 `@self`, and `~self` all generally work as expected
7095 * Static methods work in more situations
7096 * Experimental: Traits may declare default methods for the implementations
7100 * New condition handling system in `core::condition`
7101 * Timsort added to `std::sort`
7102 * New priority queue, `std::priority_queue`
7103 * Pipes for serializable types, `std::flatpipes'
7104 * Serialization overhauled to be trait-based
7105 * Expanded `getopts` definitions
7106 * Moved futures to `std`
7107 * More functions are pure now
7108 * `core::comm` renamed to `oldcomm`. Still deprecated
7109 * `rustdoc` and `cargo` are libraries now
7112 * Added a preliminary REPL, `rusti`
7113 * License changed from MIT to dual MIT/APL2
7116 Version 0.4 (2012-10-15)
7117 ==========================
7119 * ~2000 changes, numerous bugfixes
7122 * All keywords are now strict and may not be used as identifiers anywhere
7123 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
7124 'of', 'with', 'to', 'class'.
7125 * Classes are replaced with simpler structs
7126 * Explicit method self types
7127 * `ret` became `return` and `alt` became `match`
7128 * `import` is now `use`; `use is now `extern mod`
7129 * `extern mod { ... }` is now `extern { ... }`
7130 * `use mod` is the recommended way to import modules
7131 * `pub` and `priv` replace deprecated export lists
7132 * The syntax of `match` pattern arms now uses fat arrow (=>)
7133 * `main` no longer accepts an args vector; use `os::args` instead
7136 * Trait implementations are now coherent, ala Haskell typeclasses
7137 * Trait methods may be static
7138 * Argument modes are deprecated
7139 * Borrowed pointers are much more mature and recommended for use
7140 * Strings and vectors in the static region are stored in constant memory
7141 * Typestate was removed
7142 * Resolution rewritten to be more reliable
7143 * Support for 'dual-mode' data structures (freezing and thawing)
7146 * Most binary operators can now be overloaded via the traits in
7148 * `std::net::url` for representing URLs
7149 * Sendable hash maps in `core::send_map`
7150 * `core::task' gained a (currently unsafe) task-local storage API
7153 * An efficient new intertask communication primitive called the pipe,
7154 along with a number of higher-level channel types, in `core::pipes`
7155 * `std::arc`, an atomically reference counted, immutable, shared memory
7157 * `std::sync`, various exotic synchronization tools based on arcs and pipes
7158 * Futures are now based on pipes and sendable
7159 * More robust linked task failure
7160 * Improved task builder API
7163 * Improved error reporting
7164 * Preliminary JIT support
7165 * Preliminary work on precise GC
7166 * Extensive architectural improvements to rustc
7167 * Begun a transition away from buggy C++-based reflection (shape) code to
7168 Rust-based (visitor) code
7169 * All hash functions and tables converted to secure, randomized SipHash
7172 Version 0.3 (2012-07-12)
7173 ========================
7175 * ~1900 changes, numerous bugfixes
7177 * New coding conveniences
7178 * Integer-literal suffix inference
7179 * Per-item control over warnings, errors
7180 * #[cfg(windows)] and #[cfg(unix)] attributes
7181 * Documentation comments
7182 * More compact closure syntax
7183 * 'do' expressions for treating higher-order functions as
7185 * *-patterns (wildcard extended to all constructor fields)
7188 * Name resolution pass and exhaustiveness checker rewritten
7189 * Region pointers and borrow checking supersede alias
7191 * Init-ness checking is now provided by a region-based liveness
7192 pass instead of the typestate pass; same for last-use analysis
7193 * Extensive work on region pointers
7195 * Experimental new language features
7196 * Slices and fixed-size, interior-allocated vectors
7197 * #!-comments for lang versioning, shell execution
7198 * Destructors and iface implementation for classes;
7199 type-parameterized classes and class methods
7200 * 'const' type kind for types that can be used to implement
7201 shared-memory concurrency patterns
7205 * Removal of various obsolete features
7206 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
7207 'crust', 'native' (now 'extern'), 'cont' (now 'again')
7209 * Constructs: do-while loops ('do' repurposed), fn binding,
7210 resources (replaced by destructors)
7212 * Compiler reorganization
7213 * Syntax-layer of compiler split into separate crate
7214 * Clang (from LLVM project) integrated into build
7215 * Typechecker split into sub-modules
7218 * New time functions
7219 * Extension methods for many built-in types
7220 * Arc: atomic-refcount read-only / exclusive-use shared cells
7221 * Par: parallel map and search routines
7222 * Extensive work on libuv interface
7223 * Much vector code moved to libraries
7224 * Syntax extensions: #line, #col, #file, #mod, #stringify,
7225 #include, #include_str, #include_bin
7228 * Cargo automatically resolves dependencies
7231 Version 0.2 (2012-03-29)
7232 =========================
7234 * >1500 changes, numerous bugfixes
7236 * New docs and doc tooling
7238 * New port: FreeBSD x86_64
7240 * Compilation model enhancements
7241 * Generics now specialized, multiply instantiated
7242 * Functions now inlined across separate crates
7244 * Scheduling, stack and threading fixes
7245 * Noticeably improved message-passing performance
7246 * Explicit schedulers
7250 * Experimental new language features
7251 * Operator overloading
7255 * Various language extensions
7256 * C-callback function types: 'crust fn ...'
7257 * Infinite-loop construct: 'loop { ... }'
7258 * Shorten 'mutable' to 'mut'
7259 * Required mutable-local qualifier: 'let mut ...'
7260 * Basic glob-exporting: 'export foo::*;'
7261 * Alt now exhaustive, 'alt check' for runtime-checked
7262 * Block-function form of 'for' loop, with 'break' and 'ret'.
7265 * AST quasi-quote syntax extension
7266 * Revived libuv interface
7267 * New modules: core::{future, iter}, std::arena
7268 * Merged per-platform std::{os*, fs*} to core::{libc, os}
7269 * Extensive cleanup, regularization in libstd, libcore
7272 Version 0.1 (2012-01-20)
7273 ===============================
7275 * Most language features work, including:
7276 * Unique pointers, unique closures, move semantics
7277 * Interface-constrained generics
7278 * Static interface dispatch
7280 * Multithread task scheduling
7281 * Typestate predicates
7282 * Failure unwinding, destructors
7283 * Pattern matching and destructuring assignment
7284 * Lightweight block-lambda syntax
7285 * Preliminary macro-by-example
7287 * Compiler works with the following configurations:
7288 * Linux: x86 and x86_64 hosts and targets
7289 * macOS: x86 and x86_64 hosts and targets
7290 * Windows: x86 hosts and targets
7292 * Cross compilation / multi-target configuration supported.
7294 * Preliminary API-documentation and package-management tools included.
7298 * Documentation is incomplete.
7300 * Performance is below intended target.
7302 * Standard library APIs are subject to extensive change, reorganization.
7304 * Language-level versioning is not yet operational - future code will